Fastening device removal method and water supply pipe replacement method

Abstract

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for removing fasteners from a flanged joint assembly in a small working area without excavation. [Solution] The method includes a step of inserting the clamp device into the vertical hole through the vertical hole opening while the clamp device is held by the clamp device mounting jig, temporarily installing the clamp device so as to sandwich the water supply pipe side flange and the connecting branch pipe side flange, a step of fixing the temporarily installed clamp device to the flange joint device with a tightening tool inserted into the vertical hole, and a step of removing the fastening device by making it removable with a fastening device removal device inserted into the vertical hole.

Description

[Technical Field]

[0001] The present invention relates to a method for removing a fastening device in a coupling device that connects a connecting branch pipe and a water supply pipe. The present invention relates to a method for replacing a water supply pipe in a coupling device that connects a connecting branch pipe and a water supply pipe. The present invention relates to a method for installing a freezing medium storage vessel used to temporarily freeze a portion of a fluid in a water supply pipe. The present invention relates to a method for freezing a fluid in a water supply pipe, which temporarily freezes a part of the fluid in the water supply pipe. The present invention relates to a method for removing a water supply pipe by temporarily freezing a portion of the fluid in the water supply pipe. The present invention also relates to a method for replacing a water supply pipe by temporarily freezing a portion of the fluid in the water supply pipe. Furthermore, the present invention relates to a refrigerating medium storage container for storing a refrigerating medium used in a water supply pipe replacement method in which a portion of the fluid in the water supply pipe is temporarily frozen. Furthermore, the present invention relates to a freezing medium container device used in a water supply pipe replacement method in which a portion of the fluid in the water supply pipe is temporarily frozen. The present invention also relates to a water supply pipe fastening device cutting jig used in a water supply pipe replacement method in which part of the fluid in the water supply pipe is temporarily frozen. The present invention further relates to a fastener disconnecting device for use in a water supply pipe replacement method in which a portion of the fluid in the water supply pipe is temporarily frozen.

[0002] In this invention, "operating from the opening of the vertical hole" is a concept that includes both operating from the outside of the opening of the vertical hole and operating an operating lever, etc. while lying on one's stomach and inserting one's hand into the vertical hole through the opening. In the following explanation, terms meaning first and second order are used, but these terms are used to distinguish between identical parts and are not taken into consideration when interpreting the technical scope, etc. [Background technology]

[0003] For example, single- or double-port underground fire hydrants serving as water supply pipes are connected to fire hoses during firefighting activities, and therefore are replaced periodically to maintain a specified quality. Because underground fire hydrants are connected to a branch pipe branching off from a general water pipe, when replacing the water supply pipe, the valve on the main water supply pipe where the underground fire hydrant is located is closed, and the replacement work is performed without water pressure. When replacing a water supply pipe with the valve closed in this way, there is a problem that the water supply to ordinary households is also cut off. To solve this problem of water supply cutoff, a freezing method is used, as shown in Patent Documents 1 and 2. The following describes concerns regarding the use of the freezing method to replace underground fire hydrants. First, the water supply pipe installation structure of an underground water supply hydrant or the like will be described with reference to FIGS. 22 and 23. FIG. FIG. 22 is a cross-sectional view of a road on which an underground water supply hydrant 10F, one of the water supply pipes 10, is installed. A main water supply pipe 12 is laid horizontally along the road surface at a depth of about 1.3 meters below the road surface. A connecting branch pipe 14 branches off upward from the main water supply pipe 12. One or more short pipes 18 for height adjustment are connected to the upper end of the connecting branch pipe 14 via a coupling device 16, and an underground water supply hydrant 10F is fixed to the tip of the short pipe 18 via a coupling device 22. The coupling device 16 is configured such that a first flange 24 (connecting branch pipe side flange) formed at the upper end of the connecting branch pipe 14 and a second flange (water supply pipe side flange) 26 formed at the lower end of the short pipe 18 are butted together via a packing 28, and the ... and the second flange 26 are butted together via a fastening device 36 formed by a nut 34 threaded onto the tip of a bolt 32 passing through a first through hole 24H and a second through hole 26H formed in each flange. airtight1. The first flange 24 and the second flange 26 are connected to each other via a packing, forming a gap 30 of thickness T between them, thereby forming a flange coupling device 31. The coupling device 22 is configured similarly to the coupling device 16. The connecting branch pipe 14, coupling device 16, short pipe 18, coupling device 16 (22), and underground water supply hydrant 10F are installed in a vertical hole 42 formed by a vertical hole wall 38. Hereinafter, the short pipe 18 connected downstream of the connecting branch pipe 14 and the underground water supply hydrant 10F will be collectively referred to as the water supply pipe 10. Note that the underground water supply hydrant 10F may be connected directly to the connecting branch pipe 14, in which case the underground water supply hydrant 10F corresponds to the water supply pipe 10. The vertical hole opening 44 of the vertical hole 42 is usually closed by an iron cover 46. The vertical hole opening 44 is rectangular, approximately 550 mm long, 430 mm wide, and 800 mm deep, or circular with an equivalent area. Because the vertical hole 42 is sized to the same dimensions as the vertical hole opening 44, it is extremely difficult for workers to enter and work inside. Therefore, an excavation method is employed. The excavation method involves excavating the soil around the vertical hole wall 38, temporarily removing the vertical hole wall 38 to create a work area necessary for the freezing method, and then cutting the bolts 32 of the fastening device 36 of the coupling device 16 located between the short pipe 18 connected to the connecting branch pipe 14 by the freezing method, thereby enabling the removal of the previous underground water supply hydrant 10F and the short pipe 18. Note that the bolts 32 of the fastening device 36 are cut because, in many cases, the nuts 34 are difficult to loosen due to rust or other factors after the hydrant has been installed for a long time. Due to the high excavation costs associated with the excavation method, a more cost-effective method was needed. A first prior art technique that employs a freezing method when replacing a water supply pipe 10 involves digging around the branch pipe connected to the bottom of the hydrant to expose the branch pipe, attaching a low-temperature liquefied gas receiver to the branch pipe, and then injecting low-temperature liquefied gas into the receiver to freeze the water in the branch pipe.Then, the flange of the hydrant is separated from the flange of the branch pipe, and the hydrant can be repaired or replaced (Patent Document 1). A second prior art technique is a flow-uninterrupted construction method in which an existing pipeline has a T-shaped pipe section with a main pipe section and a branch pipe section protruding radially from the main pipe section, and a water supply pipe element installed in the branch pipe section of the T-shaped pipe section is removed from the existing pipeline, and the method includes a freezing process in which the fluid in the branch pipe section and / or a portion of the fluid in the main pipe section facing the branch pipe section is frozen while the fluid is flowing in the main pipe section of the T-shaped pipe section, and a removal process in which the water supply pipe element is removed while the fluid is frozen (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 51-17019 (page 1, right column to page 2, bottom left column, Figures 1 and 2) [Patent Document 2] Patent No. 6854557 (paragraphs 0022-0033, figures 1-4) Summary of the Invention [Problem to be solved by the invention]

[0005] The first conventional technique involves digging around the branch pipe to expose it, and then applying a freezing method to the exposed branch pipe.As this is essentially an excavation method, it is expensive and cannot be adopted suddenly. The second conventional technique is a construction method that can be used when there is sufficient working space around the branch pipe, and cannot be used when the working space is narrow, such as a vertical hole where a fire hydrant is installed.

[0006] A first object of the present invention is to provide a method for removing a fastening device from a flange joint device in a narrow working area without excavation. A second object of the present invention is to provide a method for replacing a water supply pipe connected by a flanged coupling device in a narrow working area without excavation. Furthermore, if at least the first object can be achieved, the object of the present invention will be achieved. The device of the present invention can also be used to remove or replace fasteners, as well as to remove water supply pipes. [Means for solving the problem]

[0007] In order to achieve this object, the first invention according to claim 1 is configured as follows. The connecting branch pipe branched off from the main water supply pipe and the downstream water supply pipe , connecting branch pipe side flange and the water supply pipe side Adjacent to the flange on the connecting branch pipe side Water supply pipe flange a coupling device including The water supply pipe is separably connected by connecting the water supply pipe to the connecting branch pipe by a flange coupling device fixed by a fastening device. The aforementioned coupling device, and The aforementioned The water supply pipe has a vertical hole opening Existing A method for removing the fastening device in a water supply pipe installation structure arranged in a vertical hole, comprising: Hold the flange on the connection branch pipe and the flange on the water supply pipe close together a clamping device including a first clamping body, a second clamping body and a clamping device arranged vertically for Clamping device One clamp mounting jig a step of inserting the vertical hole into the vertical hole through the vertical hole opening while the vertical hole is held by the The aforementioned Clamp mounting jig a step of temporarily installing the clamp device so as to sandwich the water supply pipe side flange and the connection branch pipe side flange using The temporarily installed clamp device is fastened by a fastener inserted into the vertical hole through the vertical hole opening. By operating the fastening device securing the clamping device to the flange joint device; a step of repeating a step of inserting the one clamping device into the vertical hole, a step of temporarily installing the one clamping device, and a step of fixing the one clamping device a predetermined number of times; removing the fastener by making the fastener removable by a fastener removal device inserted into the vertical hole through the vertical hole opening; The fastening device removal method is characterized by comprising:

[0008] In order to achieve this object, the second invention according to claim 2 is configured as follows. The connecting branch pipe branched off from the main water supply pipe and the downstream water supply pipe , connecting branch pipe side flange and the water supply pipe side Adjacent to the flange on the connecting branch pipe side Water supply pipe flange a coupling device including The water supply pipe is separably connected by being connected to the connecting branch pipe by a flange joint device fixed by a fastening device, and the connecting branch pipe, the joint device, and the water supply pipe have a vertical hole opening. Existing A method for removing the fastening device in a water supply pipe installation structure arranged in a vertical hole, comprising: Hold the flange on the connection branch pipe and the flange on the water supply pipe close together. a clamping device including a first clamping body, a second clamping body and a clamping device arranged vertically for Clamping device One clamp mounting jig a step of inserting the vertical hole into the vertical hole through the vertical hole opening while the vertical hole is held by the The aforementioned Clamp mounting jig a step of temporarily installing the clamp device so as to sandwich the water supply pipe side flange and the connection branch pipe side flange using The temporarily installed clamp device is fastened by a fastener inserted into the vertical hole through the vertical hole opening. By operating the fastening device securing the clamping device to the flange joint device; a step of repeating a step of inserting the one clamping device into the vertical hole, a step of temporarily installing the one clamping device, and a step of fixing the one clamping device a predetermined number of times; Integrated freezing medium holding container a step of supplying a refrigeration medium into the connecting branch pipe to freeze at least the water in the connecting branch pipe; a step of making the fastening device removable by a fastening device removal device inserted into the vertical hole through the vertical hole opening, thereby making the water supply pipe removable; This is a method for replacing a water supply pipe, including:

[0009] In order to achieve this object, the third invention according to claim 3 is configured as follows. The connecting branch pipe branched off from the main water supply pipe and the downstream water supply pipe , connecting branch pipe side flange and the water supply pipe side Adjacent to the flange on the connecting branch pipe side Water supply pipe flange a coupling device including The water supply pipe is separably connected by connecting the water supply pipe to the connecting branch pipe by a flange coupling device fixed by a fastening device. The aforementioned coupling device, and The aforementioned The water supply pipe has a vertical hole opening Existing A method for replacing a water supply pipe in a water supply pipe installation structure arranged in a vertical hole, comprising: Hold the flange on the connection branch pipe and the flange on the water supply pipe close together a clamping device including a first clamping body, a second clamping body and a clamping device arranged vertically for Clamping device One clamp mounting jig a step of inserting the vertical hole into the vertical hole through the vertical hole opening while the vertical hole is held by the The aforementioned Clamp mounting jig a step of temporarily installing the clamp device so as to sandwich the water supply pipe side flange and the connection branch pipe side flange using The temporarily installed clamp device is fastened by a fastener inserted into the vertical hole through the vertical hole opening. By operating the fastening device securing the clamping device to the flange joint device; a step of repeating a step of inserting the one clamping device into the vertical hole, a step of temporarily installing the one clamping device, and a step of fixing the one clamping device a predetermined number of times; a step of inserting a container jig holding divided refrigeration medium storage containers into the vertical hole through the vertical hole opening, and surrounding at least a portion of the connecting branch pipe with the divided refrigeration medium storage containers; a positioning step of abutting a stopper provided on the divided refrigeration medium storage container against the coupling device; A step of constructing an integrated refrigeration medium storage container using a plurality of the divided refrigeration medium storage containers; a step of supplying a refrigerating medium into the integrated refrigerating medium storage container and freezing at least the water in the connecting branch pipe; a step of cutting the fastening device in the flange joint device with a fastening device cutting device inserted into the vertical hole through the vertical hole opening, thereby making the water supply pipe removable; removing the water supply pipe from the well opening; a step of inserting a new water supply pipe into the vertical hole through the vertical hole opening and aligning it with the connecting branch pipe; a step of inserting a new fastening device (36) into the vertical hole (42) through the vertical hole opening (44) to fasten the water supply pipe flange and the connection branch pipe flange together; This is a method for replacing a water supply pipe, including:

[0010] To achieve this goal , 4th invention is structured as follows: A method for replacing a water supply pipe in a water supply pipe installation structure in which a connecting branch pipe branched from a water supply main pipe and a downstream water supply pipe are connected by a flange coupling device in which a flange on the connecting branch pipe side and a flange on the water supply pipe side are fixed by a fastening device, thereby allowing the water supply pipe to be detachably connected, and the connecting branch pipe, the flange coupling device, and the water supply pipe are arranged in a vertical hole having a vertical hole opening, comprising: a step of inserting a clamp device that holds the connection branch pipe side flange and the water supply pipe side flange close to each other into the vertical hole through the vertical hole opening while being held by a clamp device mounting jig; a step of temporarily installing the clamp device using the clamp device mounting jig so as to sandwich the water supply pipe side flange and the connection branch pipe side flange; a step of fixing the temporarily installed clamp device to the flange joint device with a fastener inserted into the vertical hole through the vertical hole opening; a step of inserting a container jig holding divided refrigeration medium storage containers into the vertical hole through the vertical hole opening, and surrounding at least a portion of the connecting branch pipe with the divided refrigeration medium storage containers; a positioning step of abutting a stopper provided on the divided refrigeration medium storage container against the flange on the connecting branch pipe side; A step of constructing an integrated refrigeration medium storage container using a plurality of the divided refrigeration medium storage containers; a step of supplying a refrigerating medium into the integrated refrigerating medium storage container through a refrigerating medium supply pipe inserted from the vertical hole opening, and freezing at least the water in the connecting branch pipe; a step of cutting the fastening device in the flange joint device with a fastening device cutting device inserted into the vertical hole through the vertical hole opening, thereby making the water supply pipe removable; removing the water supply pipe from the well opening; a step of inserting a new water supply pipe into the vertical hole through the vertical hole opening and aligning it with the connecting branch pipe; a step of inserting a new fastening device into the vertical hole from the vertical hole opening using a fastening device jig to fasten the water supply pipe side flange and the connection branch pipe side flange using the fastening device jig; This is a method for replacing a water supply pipe, including:

[0011] To achieve this goal , 5th invention is structured as follows: The stopper is an upper edge of the plurality of divided refrigeration medium storage containers. This is a water supply pipe replacement method according to the third or fourth invention, characterized in that:

[0012] To achieve this goal , 6th invention is structured as follows: The clamping device includes a first clamping body and a second clamping body arranged vertically, a support shaft that supports the first clamping body and the second clamping body so that they can rotate relative to each other; a clamping device that brings the first clamping body and the second clamping body closer together; and a biasing member that biases the first clamping member and the second clamping member so that they separate from each other. The fastening device removal method according to the first aspect of the present invention is characterized in that:

[0013] To achieve this goal , 7th invention is structured as follows: The clamping device includes a first clamping body and a second clamping body arranged vertically, a support shaft that supports the first clamping body and the second clamping body so that they can rotate relative to each other; a clamping device that brings the first clamping body and the second clamping body closer together; and a biasing member that biases the first clamping member and the second clamping member so that they separate from each other. The water supply pipe replacement method according to any one of the second to fourth aspects of the present invention is characterized in that:

[0014] The eighth invention is structured as follows: the first clamping body and the second clamping body are elongated plate-like bodies, a first bearing plate is provided downward from the first clamping body, A second bearing plate and a third bearing plate are arranged in parallel at a predetermined interval from the second clamping body upward, a lower end of the first bearing plate is disposed between upper ends of the second bearing plate and the third bearing plate; a support shaft passes through the second bearing plate, the first bearing plate, and the third bearing plate, and both ends of the support shaft protrude outward from the first bearing plate and the third bearing plate, The tightening device is composed of a tightening bolt and a nut, the tightening bolt passes through the first clamping body and the second clamping body, The nut is threaded onto the tip of the tightening bolt that penetrates the second clamping body, The biasing body is fitted on the clamping bolt between the first clamping body and the second clamping body. The sixth aspect of the present invention is a fastening device removal method.

[0015] 9th invention is structured as follows: the first clamping body and the second clamping body are elongated plate-like bodies, a first bearing plate is provided downward from the first clamping body, A second bearing plate and a third bearing plate are arranged in parallel at a predetermined interval from the second clamping body upward, a lower end of the first bearing plate is disposed between upper ends of the second bearing plate and the third bearing plate; a support shaft passes through the second bearing plate, the first bearing plate, and the third bearing plate, and both ends of the support shaft protrude outward from the first bearing plate and the third bearing plate, The tightening device is composed of a tightening bolt and a nut, the tightening bolt passes through the first clamping body and the second clamping body, The nut is threaded onto the tip of the tightening bolt that penetrates the second clamping body, The biasing body is fitted on the clamping bolt between the first clamping body and the second clamping body. This is a method for replacing a water supply pipe according to the seventh invention, characterized in that:

[0016] 10th invention is structured as follows: The clamp device mounting jig is a rod-shaped support; A first holding plate and a second holding plate are provided at a lower end of the support at a distance such that the second clamping body can be positioned, and the first holding recess and the second holding recess are formed upward. thing The fastening device removal method of the eighth invention is characterized by the above.

[0017] 11th invention is structured as follows: The clamp device mounting jig is a rod-shaped support; A first holding plate and a second holding plate are provided at a lower end of the support at a distance such that the second clamping body can be positioned, and the first holding recess and the second holding recess are formed upward. thing This is a ninth invention of a water supply pipe replacement method characterized by the above. [Effects of the Invention]

[0018] In the first invention of claim 1, prior to removing the fastening device of the flange joint device, the clamp device attached to the clamp device mounting jig is inserted into the vertical hole through the vertical hole opening, and the clamp device is temporarily installed so as to clamp the connecting branch pipe side flange and the water supply pipe side flange. Next, the temporarily installed clamp device is tightened with a tightening tool so that the flange on the connection branch pipe side and the flange on the water supply pipe side approach each other, and the clamp device is fixed to the flange joint device. The fastening device is then removed. Even if the fastening device is removed, the flange on the connecting branch pipe side and the flange on the water supply pipe side are fixed by the clamp device, so the water supply pipe will not be blown away by fluid pressure, and the fastening device can be removed safely. Therefore, the fastening device can be removed without excavation even in a narrow space, which has the advantage of achieving the first object of the present invention.

[0019] In the second invention according to claim 2, prior to replacing the water supply pipe, the clamp device attached to the clamp device mounting jig is inserted into the vertical hole through the vertical hole opening, and the clamp device is temporarily installed so that it clamps the connecting branch pipe side flange and the water supply pipe side flange. Next, the temporarily installed clamp device is tightened with a clamping tool so that the flanges on the connection branch pipe and the water supply pipe come closer together, and the clamp device is fixed to the flange coupling device. This ensures that the flanges on the connection branch pipe and the water supply pipe of the flange coupling device will not separate even if the fastening device is removed. Next, the fastening device is removed by making it removable using a fastening device removal device inserted into the vertical hole through the vertical hole opening. As a result, the connecting branch pipe side flange and the water supply pipe side flange are clamped by a clamping device inserted into the vertical hole through the vertical hole opening, and then the fastening device is removed.Since the connecting branch pipe side flange and the water supply pipe side flange are fixed by the clamping device, the water supply pipe will not be blown away by fluid pressure, and the fastening device can be removed safely. Next, using a container jig holding the divided refrigeration medium storage containers, the divided refrigeration medium storage containers are inserted into the vertical hole through the vertical hole opening, and the divided refrigeration medium storage containers surround at least a portion of the connecting branch pipe to form an integrated refrigeration medium storage container. Next, a freezing medium is supplied into the freezing medium storage container, and at least the water in the connecting branch pipes is frozen. Next, a fastener removal device is inserted into the vertical hole through the vertical hole opening to remove the fastener in the coupling device, allowing the water supply pipe to be removed. The removable water supply pipe is then removed from the well opening. Next, insert the new water supply pipe into the vertical hole through the vertical hole opening and align the flange on the water supply pipe side with the flange on the connecting branch pipe side. Next, a new fastening device is inserted into the vertical hole through the vertical hole opening to fasten the water supply pipe flange and the connecting branch pipe flange together. Therefore, all work required to replace the water supply pipes can be done using tools inserted through the vertical hole opening, so water supply pipes can be replaced without digging even in narrow spaces, which has the advantage of achieving the second object of the present invention.

[0020] In the third invention according to claim 3, prior to replacing the water supply pipe, the clamp device attached to the clamp device mounting jig is inserted into the vertical hole through the vertical hole opening, and the clamp device is temporarily installed so as to clamp the connecting branch pipe side flange and the water supply pipe side flange. Next, the temporarily installed clamp device is tightened with a tightening tool so that the flanges on the connection branch pipe and the water supply pipe approach each other, and the clamp device is fixed to the flange joint device. This prevents the flanges on the connection branch pipe and the water supply pipe of the flange joint device from separating even if the fastening device is removed. Next, using a container jig holding the divided refrigeration medium storage containers, the divided refrigeration medium storage containers are inserted into the vertical hole through the vertical hole opening, and the divided refrigeration medium storage containers are placed so as to surround at least a portion of the connecting branch pipe. Next, the divided refrigeration medium storage container is moved using a container jig, and the stopper provided on the divided refrigeration medium storage container is abutted against the flange on the connecting branch pipe side to position the divided refrigeration medium storage container, thereby forming an integrated refrigeration medium storage container from multiple divided refrigeration medium storage containers. Next, a refrigerating medium is supplied into the refrigerating medium storage container through the refrigerating medium supply pipe, and at least the water in the connecting branch pipe is frozen. Next, the fastening device in the coupling device is cut by a fastening device cutting device inserted into the vertical hole through the vertical hole opening, making it possible to remove the fastening device and take out the water supply pipe. As a result, the connecting branch pipe side flange and the water supply pipe side flange are clamped with a clamping device inserted into the vertical hole through the vertical hole opening, and then the fastening device is removed.Therefore, even if the fastening device breaks, the connecting branch pipe side flange and the water supply pipe side flange are fixed by the clamping device, so the water supply pipe will not be blown away by fluid pressure and the fastening device can be removed safely. The removable water supply pipe is then removed from the well opening. Next, insert the new water supply pipe into the vertical hole through the vertical hole opening and align the flange on the water supply pipe side with the flange on the connecting branch pipe side. Next, a new fastening device is inserted into the vertical hole through the vertical hole opening to fasten the water supply pipe flange and the connecting branch pipe flange together. Therefore, all work can be done using tools inserted through the vertical hole opening, so the water supply pipe can be replaced without digging even in narrow spaces, which has the advantage of achieving the second object of the present invention.

[0021] The fourth invention In this case, prior to replacing the water supply pipe, the clamp device attached to the clamp device mounting jig is inserted into the vertical hole through the vertical hole opening, and the clamp device is temporarily installed so that it clamps the connecting branch pipe flange and the water supply pipe flange. The clamping device is then temporarily installed and tightened with a clamping tool to bring the flanges of the connection branch pipe and the water supply pipe closer together, securing the clamping device to the flange coupling device. This prevents the flanges of the connection branch pipe and the water supply pipe from separating even when the fastening device is removed. The fastening device is removed after clamping the flange on the connecting branch pipe side and the flange on the water supply pipe side with a clamping device inserted into the vertical hole from the vertical hole opening, so even if the fastening device is removed, the flange on the connecting branch pipe side and the flange on the water supply pipe side are fixed by the clamping device, so the water supply pipe will not be blown away by fluid pressure and the fastening device can be removed safely. Next, using a container jig holding the divided refrigeration medium storage containers, the divided refrigeration medium storage containers are inserted into the vertical hole through the vertical hole opening, and the divided refrigeration medium storage containers are placed so as to surround at least a portion of the connecting branch pipe. Next, the divided refrigeration medium storage container is moved using a container jig, and the stopper provided on the divided refrigeration medium storage container is abutted against the flange on the connecting branch pipe side to position the divided refrigeration medium storage container, thereby forming an integrated refrigeration medium storage container from multiple divided refrigeration medium storage containers. Next, a freezing medium is supplied into the freezing medium storage container through a freezing medium supply pipe inserted into the vertical hole from the opening of the vertical hole, thereby freezing at least the water in the connecting branch pipe. Next, a fastener cutting device inserted into the vertical hole through the vertical hole opening is used to cut the fastener in the coupling device, allowing the water supply pipe to be removed. The fastener is then removed. The removable water supply pipe is then removed from the well opening. Next, insert the new water supply pipe into the vertical hole through the vertical hole opening and align the flange on the water supply pipe side with the flange on the connecting branch pipe side. Next, a new fastening device is inserted into the vertical hole through the vertical hole opening using the fastening device jig, and the water supply pipe flange and the connecting branch pipe flange are fastened together. Therefore, all work can be done using tools inserted through the vertical hole opening, so the water supply pipe can be replaced without digging even in narrow spaces, which has the advantage of achieving the second object of the present invention.

[0022] Fifth Invention In the present invention, the stoppers are the upper edges of the divided refrigeration medium storage containers. Since the stoppers can be positioned by contacting the coupling device, the divided refrigeration medium storage containers can be installed in appropriate positions more accurately relative to the connecting branch pipes and the coupling device. Furthermore, since the stoppers are the upper edges of the divided refrigeration medium storage containers, the shape of the divided refrigeration medium storage containers can be simplified and made smaller.

[0023] The sixth invention In the present invention, the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. The first and second clamping bodies can rotate around a support shaft and are normally biased by a biasing body in the direction of moving apart, so the first and second clamping bodies can maintain a distance greater than the distance between the flange on the connection branch pipe and the flange on the water supply pipe, which is convenient when temporarily installing the flange by clamping it between the flange on the connection branch pipe and the flange on the water supply pipe. In addition, the clamping device can bring the first clamping body and the second clamping body closer together against the biasing force of the biasing body, thereby clamping the connection branch pipe side flange and the water supply pipe side flange and fixing them together.

[0024] The seventh invention In the present invention, the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. The first and second clamping bodies can rotate around a support shaft and are normally biased by a biasing body in the direction of moving apart, so the first and second clamping bodies can maintain a distance greater than the distance between the flange on the connection branch pipe and the flange on the water supply pipe, which is convenient when temporarily installing the flange by clamping it between the flange on the connection branch pipe and the flange on the water supply pipe. In addition, the first clamping body and the second clamping body can be brought closer together against the biasing force of the biasing body by the tightening device, thereby clamping the connection branch pipe side flange and the water supply pipe side flange and fixing them together.

[0025] The eighth invention In the present invention, the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. In addition, a first bearing plate is provided downward from the first clamping body, and a second bearing plate and a third bearing plate are arranged side by side at a predetermined interval from the second clamping body upward, with the lower end of the first bearing plate being positioned between the upper ends of the second bearing plate and the third bearing plate, and a support shaft passing through the second bearing plate, the first bearing plate, and the third bearing plate, with its head protruding outward from the first bearing plate and the third bearing plate. Furthermore, the tightening device is composed of a tightening bolt and a nut, the tightening bolt passes through the first clamping body and the second clamping body, a nut is screwed onto the tip of the tightening bolt that passes through the second clamping body, and the biasing body is attached to the tightening bolt between the first clamping body and the second clamping body. The first and second clamping bodies can rotate around a support shaft and are normally biased by a biasing body in the direction of moving apart, so the first and second clamping bodies can maintain a distance greater than the distance between the flange on the connection branch pipe and the flange on the water supply pipe, which is convenient when temporarily installing the flange by clamping it between the flange on the connection branch pipe and the flange on the water supply pipe. In addition, by tightening the clamping bolt, the first clamping body and the second clamping body can be brought closer together against the biasing force of the biasing body, thereby clamping the connection branch pipe side flange and the water supply pipe side flange and fixing them in place. Furthermore, since the support shaft is supported on both sides by the second bearing plate and the third bearing plate, it has high strength, and since the biasing body is attached to the tightening bolt between the first clamping body and the second clamping body, the device can be made smaller.

[0026] 9th invention In the present invention, the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. In addition, a first bearing plate is provided downward from the first clamping body, and a second bearing plate and a third bearing plate are arranged side by side at a predetermined interval from the second clamping body upward, with the lower end of the first bearing plate being positioned between the upper ends of the second bearing plate and the third bearing plate, and a support shaft passing through the second bearing plate, the first bearing plate, and the third bearing plate, with its head protruding outward from the first bearing plate and the third bearing plate. Furthermore, the tightening device is composed of a tightening bolt and a nut, the tightening bolt passes through the first clamping body and the second clamping body, a nut is screwed onto the tip of the tightening bolt that passes through the second clamping body, and the biasing body is attached to the tightening bolt between the first clamping body and the second clamping body. The first and second clamping bodies can rotate around a support shaft and are normally biased by a biasing body in the direction of moving apart, so the first and second clamping bodies can maintain a distance greater than the distance between the flange on the connection branch pipe and the flange on the water supply pipe, which is convenient when temporarily installing the flange by clamping it between the flange on the connection branch pipe and the flange on the water supply pipe. In addition, the first clamping body and the second clamping body can be brought closer together against the biasing force of the biasing body using the tightening bolt, thereby clamping the connection branch pipe side flange and the water supply pipe side flange and fixing them in place. Furthermore, since the support shaft is supported on both sides by the second bearing plate and the third bearing plate, it has high strength, and since the biasing body is attached to the tightening bolt between the first clamping body and the second clamping body, the device can be made smaller.

[0027] 10th invention In the clamp device mounting jig, a rod-shaped support body is provided with a first holding plate and a second holding plate at a distance that allows the second clamping body to be positioned at the lower end of the support body, and upwardly facing first holding recesses and second holding recesses are formed. The second clamping body of the clamping device is installed between the first and second holding plates, thereby restricting the widthwise movement of the clamping device, and the support shafts protruding outward from the second and third bearing plates are positioned in the first and second holding recesses, thereby restricting the longitudinal movement of the clamping device and stabilizing the position of the clamping device. This makes it easy to temporarily install the clamp device on the flange joint device prior to attaching the fastening device.

[0028] The eleventh invention The clamp device mounting jig has a rod-shaped support, a first holding plate and a second holding plate spaced apart at the lower end of the support so that the second clamping body can be positioned, and upwardly facing first holding recesses and second holding recesses. The second clamping body of the clamping device is installed between the first and second holding plates, thereby restricting the widthwise movement of the clamping device, and the support shafts protruding outward from the second and third bearing plates are positioned in the first and second holding recesses, thereby restricting the longitudinal movement of the clamping device and stabilizing the position of the clamping device. This makes it easy to temporarily install the clamp device on the flange joint device prior to replacing the water supply pipe. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a flowchart of a water supply pipe removal method according to a first embodiment of the present invention. [Figure 2] Figure 2 shows a refrigeration medium storage container used in the water supply pipe removal method of Example 1 of the present invention, where (A) is an oblique view of refrigeration medium storage container 1, which is composed of a first refrigeration medium storage container and a second refrigeration medium storage container, viewed from diagonally above, (B) is a plan view of the first refrigeration medium storage container, (C) is a front view, and (D) is a right side view. [Figure 3] Figure 3 shows a container jig used in the water supply pipe removal method of Example 1 of the present invention, where (A) is an explanatory diagram of the state in which the first refrigeration medium storage container is installed around the connecting branch pipe using the first container jig, (B) is an explanatory diagram for explaining the relationship between the first refrigeration medium storage container and the connecting branch pipe, (C) is an explanatory diagram of the state in which the second refrigeration medium storage container is installed around the connecting branch pipe using the second container jig, and (D) is an explanatory diagram for explaining the relationship between the first refrigeration medium storage container, the second refrigeration medium storage container and the connecting branch pipe. [Figure 4] 4A and 4B show a first refrigerating medium retaining container device constituting the refrigerating medium retaining container device used in the water supply pipe removing method according to the first embodiment of the present invention, where (A) is a front view and (B) is a rear view. [Figure 5] Figure 5 shows the first refrigeration medium storage container device that constitutes the refrigeration medium storage container device used in the water supply pipe removal method of Example 1 of the present invention, where (A) is a cross-sectional view along line A-A in Figure 4(A), (B) is an oblique view from above the front of the first container holding device, and (C) is an oblique view from above the back of the first container holding device. [Figure 6] FIG. 6 shows a container jig used in the water supply pipe removal method of Example 1 of the present invention, where (A) is a side view and (B) is a cross-sectional view taken along line BB in (A). [Figure 7] FIG. 7 is an explanatory diagram of a state in which a refrigerating medium storage container is constructed using a container jig in the water supply pipe removal method according to the first embodiment of the present invention. [Figure 8] Figure 8 is an explanatory diagram for explaining the supply of freezing medium to a freezing medium storage container device composed of a first freezing medium storage container device and a second freezing medium storage container device through a freezing medium supply pipe in the water supply pipe removal method of Example 1 of the present invention. [Figure 9]FIG. 9 is an explanatory diagram of a refrigeration medium storage container cutting device used in the water supply pipe removal method according to the first embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory perspective view of a fastening device cutting jig used in the water supply pipe removing method according to the first embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory view for explaining an impact for fixing the fastening device cutting jig to the coupling device, which is used in the water supply pipe removing method according to the first embodiment of the present invention. [Figure 12] FIG. 12 is an explanatory view for explaining the action of cutting the fastening device by engaging the cutting device with the fastening device cutting jig used in the water supply pipe removing method of the first embodiment of the present invention. [Figure 13] FIG. 13 is an explanatory view for explaining a fastening device cutting device that is engaged with a cutting jig to cut a fastening device used in the water supply pipe removing method of the first embodiment. [Figure 14] FIG. 14 is an explanatory perspective view for explaining a fastening device cutting device that is engaged with a fastening device cutting jig to cut a fastening device used in the water supply pipe removing method of the first embodiment of the present invention. [Figure 15] FIG. 15 is an explanatory diagram for explaining the removal procedure in the water supply pipe removal method of the first embodiment. [Figure 16] FIG. 16 is an explanatory diagram for explaining the removal procedure in the water supply pipe removal method of the first embodiment. [Figure 17] FIG. 17 is an explanatory diagram for explaining the removal procedure in the water supply pipe removal method of the first embodiment. [Figure 18] FIG. 18 is an explanatory diagram for explaining the removal procedure in the water supply pipe removal method of the first embodiment. [Figure 19] FIG. 19 is an explanatory diagram for explaining the removal procedure in the water supply pipe removal method of the first embodiment. [Figure 20] FIG. 20 is a flowchart of a water supply pipe replacement method according to a second embodiment of the present invention. [Figure 21] FIG. 21 is an explanatory diagram illustrating a fastening device jig for passing a bolt of a fastening device used in a water supply pipe replacing method according to a second embodiment of the present invention through a joint device and tightening a nut. [Figure 22] Figure 22 is a second example of an integrated refrigeration medium storage container device consisting of a first refrigeration medium storage container device and a second refrigeration medium storage container device used in an embodiment of the water supply pipe removal method of the present invention, where (A) is a plan view, (B) is a front view of the first refrigeration medium storage container device, and (C) is a plan view of the first refrigeration medium storage container device. [Figure 23] Figure 23 shows a second example of a fastening device cutting jig used in an embodiment of the water supply pipe removal method of the present invention, where (A) is a plan view of the fastening device attached to the coupling device, and (B) is a cross-sectional view along line BB in (A). [Figure 24] Figure 24 shows a third example of a fastening device cutting jig used in a water supply pipe removal method according to an embodiment of the present invention, where (A) is a plan view of the fastening device cutting jig, (B) is a front view, (C) is a right side view, and (D) is a perspective view. [Figure 25] Figure 25 is an explanatory diagram for explaining how to use a third example of a fastening device cutting jig used in an embodiment of the water supply pipe removal method of the present invention, where (A) is a front view, (B) is a side view of the clamp device, and (C) is a plan view. [Figure 26] Figure 26 shows a third example of a fastening device cutting jig used in an embodiment of the water supply pipe removal method of the present invention, which is a jig for attaching to a coupling device, where (A) is a partially enlarged oblique view, and (B) is a partially enlarged oblique view of the third example of the fastening device cutting jig attached. [Figure 27] FIG. 27 is a flowchart of a water supply pipe replacement method performed using the third example of the fastening device cutting jig. [Figure 28] Figure 28 is an explanatory diagram of a second example of a fastening device cutting device that engages with a fastening device cutting jig used in an embodiment of the water supply pipe removal method of the present invention to cut a fastening device, where (A) is an overall oblique view, (B) is an enlarged oblique view of the rotary blade mounting portion, and (C) is a cross-sectional view of the rotary blade mounting structure. [Figure 29] FIG. 29 is a partial cross-sectional front view of a third example of a fastening device cutting device that is engaged with a fastening device cutting jig to cut a fastening device used in a water supply pipe removal method according to an embodiment of the present invention. [Figure 30]Figure 30 shows a second example of a fastening device jig for passing the bolt of a fastening device used in an embodiment of the water supply pipe replacement method through a coupling device and tightening a nut onto the bolt after passing through, where (A) is an oblique view of the main part, (B) is an oblique view from above, and (C) is an explanatory oblique view of the gear train. [Figure 31] Figure 31 shows an example of a fastening device removal device for removing a fastening device in a water supply pipe removal method according to an embodiment of the present invention, where (A) is an overall oblique view, (B) is an enlarged oblique view of the main part, (C) is a plan view of the main part, and (D) is an explanatory cross-sectional view of the location part. [Figure 32] FIG. 32 is an explanatory view of a fourth example of a fastening device removal device for removing a fastening device in the water supply pipe removal method according to the embodiment of the present invention. [Figure 33] Figure 33 is an explanatory diagram of a fourth example of a fastening device removal device that removes a fastening device in a water supply pipe removal method according to an embodiment of the present invention, where (A) is a partially enlarged plan view and (B) is a partially enlarged cross-sectional view. [Figure 34] Figure 34 shows a second example of a clamping device used in an embodiment of the water supply pipe removal method of the present invention, where (A) is a plan view, (B) is a front view, (C) is a bottom view, (D) is a left side view, and (E) is a right side view. [Figure 35] Figure 35 shows a second example of a clamping device used in a water supply pipe removal method according to an embodiment of the present invention, in which (A) is an oblique view of the clamping device installed in a clamping device jig, (B) is a partial cross-sectional plan view of the clamping device jig, (C) is a partial front view of the clamping device jig, and (D) is an explanatory diagram for explaining a method of attaching the clamping device to a coupling device. [Figure 36] FIG. 36 is a flowchart of a water supply pipe replacement method using the second clamping device. [Figure 37] FIG. 37 is a cross-sectional view for explaining the prior art. [Figure 38] FIG. 38 is a cross-sectional view of a water supply pipe for explaining the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention relates to a method for removing a fastening device in a water supply pipe installation structure in which a connecting branch pipe branched from a water supply main pipe and a downstream water supply pipe are connected by a flange coupling device in which the connecting branch pipe flange and the water supply pipe flange on the water supply pipe side are fixed by a fastening device, thereby allowing the water supply pipe to be detachably connected, and the connecting branch pipe, coupling device, and water supply pipe are arranged in a vertical hole having a vertical hole opening, and the method includes: holding the connecting branch pipe flange and the water supply pipe flange so that they approach each other, and holding the fastening device in a clamp device mounting jig. a process of inserting the clamp device into the vertical hole from the vertical hole opening while the clamp device is in the opened position; a process of temporarily installing the clamp device using the clamp device installation jig so as to sandwich the water supply pipe side flange and the connecting branch pipe side flange; a process of fixing the temporarily installed clamp device to the flange joint device with a tightening tool inserted into the vertical hole from the vertical hole opening; and a process of removing the fastening device by making it removable with a fastening device removal device inserted into the vertical hole from the vertical hole opening. Furthermore, a method for replacing a water supply pipe in a water supply pipe installation structure in which a connecting branch pipe branched from a main water supply pipe and a downstream water supply pipe are connected by a flange coupling device in which the connecting branch pipe flange and the water supply pipe flange on the water supply pipe side are fixed by a fastening device, thereby allowing the water supply pipe to be detachably connected, and the connecting branch pipe, coupling device, and water supply pipe are arranged in a vertical hole having a vertical hole opening, includes the steps of: inserting a clamping device that holds the connecting branch pipe flange and the water supply pipe flange so as to approach each other into the vertical hole from the vertical hole opening while being held by a clamping device mounting jig; temporarily installing the clamping device using the clamping device mounting jig so as to sandwich the water supply pipe flange and the connecting branch pipe flange; and fastening the temporarily installed clamping device by a fastener inserted into the vertical hole from the vertical hole opening. a step of fixing a pump device to the flange coupling device; a step of inserting a container jig holding a divided freezing medium storage container into the vertical hole from the vertical hole opening and surrounding at least a portion of the connecting branch pipe with a plurality of divided freezing medium storage containers to form an integrated freezing medium storage container; a step of supplying freezing medium into the integrated freezing medium storage container and freezing at least the water in the connecting branch pipe; a step of making the fastening device removable by a fastening device removal device inserted into the vertical hole from the vertical hole opening so that the water supply pipe can be removed; a step of removing the water supply pipe from the vertical hole opening; a step of inserting a new water supply pipe into the vertical hole from the vertical hole opening and making it face the connecting branch pipe; and a step of inserting a new fastening device into the vertical hole from the vertical hole opening to fix the water supply pipe side flange and the connecting branch pipe side flange. Furthermore, a method for replacing a water supply pipe in a water supply pipe installation structure in which a connecting branch pipe branched from a water supply main pipe and a downstream water supply pipe are connected by a flange coupling device in which the connecting branch pipe flange and the water supply pipe flange on the water supply pipe side are fixed by a fastening device, thereby allowing the water supply pipe to be separably connected, and the connecting branch pipe, coupling device, and water supply pipe are arranged in a vertical hole having a vertical hole opening, includes the steps of: inserting a clamping device that holds the connecting branch pipe flange and the water supply pipe flange so as to approach each other into the vertical hole from the vertical hole opening while being held by a clamping device mounting jig; temporarily installing the clamping device using the clamping device mounting jig so as to sandwich the water supply pipe flange and the connecting branch pipe flange; and fastening the temporarily installed clamping device by a fastener inserted into the vertical hole from the vertical hole opening. a step of fixing a pump device to the flange joint device; a step of inserting a container jig holding a divided freezing medium storage container into the vertical hole from the vertical hole opening and surrounding at least a portion of the connecting branch pipe with a plurality of the divided freezing medium storage containers; a positioning step of abutting a stopper provided on the divided freezing medium storage container against the joint device; a step of forming an integrated freezing medium storage container with a plurality of the divided freezing medium storage containers; a step of supplying freezing medium into the integrated freezing medium storage container and freezing at least water in the connecting branch pipe; a step of cutting the fastening device in the flange joint device with a fastening device cutting device inserted into the vertical hole from the vertical hole opening and making the water supply pipe removable; a step of removing the water supply pipe from the vertical hole opening; a step of inserting a new water supply pipe into the vertical hole from the vertical hole opening and aligning it with the connecting branch pipe; Place The vertical hole Mouth From the above vertical Inside the hole and fastening the water supply pipe flange and the connecting branch pipe flange together. Furthermore, a method for replacing a water supply pipe in a water supply pipe installation structure in which a connecting branch pipe branched from a water supply main pipe and a downstream water supply pipe are connected by a flange coupling device in which the connecting branch pipe flange and the water supply pipe flange on the water supply pipe side are fixed by a fastening device, thereby allowing the water supply pipe to be detachably connected, and the connecting branch pipe, the flange coupling device, and the water supply pipe are arranged in a vertical hole having a vertical hole opening, the method comprising the steps of: inserting a clamping device that holds the connecting branch pipe flange and the water supply pipe flange so that they approach each other into the vertical hole through the vertical hole opening while being held by a clamping device mounting jig; temporarily installing the clamping device using the clamping device mounting jig so that it sandwiches the water supply pipe flange and the connecting branch pipe flange; and removing the temporarily installed clamping device from the vertical hole opening. a step of fixing the clamp device to the flange joint device with a fastener inserted into the vertical hole; a step of inserting a container jig holding a divided freezing medium storage container into the vertical hole from the vertical hole opening and surrounding at least a portion of the connecting branch pipe with the divided freezing medium storage containers; a positioning step of abutting a stopper provided on the divided freezing medium storage container against the connecting branch pipe side flange; a step of constructing an integrated freezing medium storage container with the divided freezing medium storage containers; a step of supplying freezing medium into the integrated freezing medium storage container with a freezing medium supply pipe inserted from the vertical hole opening and freezing at least water in the connecting branch pipe; a step of cutting the fastening device in the flange joint device with a fastening device cutting device inserted into the vertical hole from the vertical hole opening to make the water supply pipe removable; Preferably, the method for replacing a water supply pipe includes the steps of removing the water supply pipe from the vertical hole opening, inserting a new water supply pipe into the vertical hole from the vertical hole opening and positioning it opposite the connecting branch pipe, and inserting a new fastening device into the vertical hole from the vertical hole opening using a fastening device jig and fastening the water supply pipe side flange and the connecting branch pipe side flange using the fastening device jig. In addition, the method for replacing a water supply pipe is preferably characterized in that the stopper is an upper edge of the plurality of divided refrigeration medium storage containers. Furthermore, it is preferable that the fastening device removal method is characterized in that the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. Furthermore, it is preferable that the method for replacing a water supply pipe is characterized in that the clamping device includes a first clamping body and a second clamping body arranged above and below, a support shaft that supports the first clamping body and the second clamping body so that they can rotate freely relative to each other, a tightening device that brings the first clamping body and the second clamping body closer together, and a biasing body that biases the first clamping body and the second clamping body so that they move apart. Preferably, the fastening device removal method is characterized in that the first clamping body and the second clamping body are elongated plate-like bodies, a first bearing plate is provided downward from the first clamping body, a second bearing plate and a third bearing plate are arranged in a row at a predetermined interval upward from the second clamping body, the lower end of the first bearing plate is disposed between the upper end of the second bearing plate and the third bearing plate, a support shaft passes through the second bearing plate, the first bearing plate, and the third bearing plate and both ends of the support shaft protrude outward from the first bearing plate and the third bearing plate, the fastening device is constituted by a clamping bolt and a nut, the clamping bolt passes through the first clamping body and the second clamping body and the nut is screwed onto the tip of the clamping bolt that has passed through the second clamping body, and the biasing body is fitted on the clamping bolt between the first clamping body and the second clamping body. Furthermore, it is preferable that the water supply pipe replacement method is characterized in that the first clamping body and the second clamping body are elongated plate-like bodies, a first bearing plate is provided downward from the first clamping body, a second bearing plate and a third bearing plate are arranged in a row at a predetermined interval upward from the second clamping body, the lower end of the first bearing plate is arranged between the upper ends of the second bearing plate and the third bearing plate, a support shaft passes through the second bearing plate, the first bearing plate, and the third bearing plate, and both ends of the support shaft protrude outward from the first bearing plate and the third bearing plate, the tightening device is composed of a tightening bolt and a nut, the tightening bolt passes through the first clamping body and the second clamping body, and the nut is screwed onto the tip of the tightening bolt that has passed through the second clamping body, and the biasing body is sheathed on the tightening bolt between the first clamping body and the second clamping body. Furthermore, the clamp device mounting jig is characterized in that it comprises a rod-shaped support, a first holding plate and a second holding plate provided at a distance such that the second clamping body can be positioned at the lower end of the support, and has upwardly facing first holding recesses and second holding recesses. How to replace a water supply pipe It is preferable that: [Example]

[0031] A first embodiment of the water supply pipe removal method of the present invention will be described with reference to the flowchart shown in Fig. 1. The same parts as those in the prior art will be given the same reference numerals and their explanations will be omitted, and different configurations will be described. First, in step ST11, the first container jig 1041 to the nth container jig 104n holding the first divided refrigerating medium storage container 1021 to the nth divided refrigerating medium storage container 102n are inserted into the vertical hole 42 from the vertical hole opening 44, and at least a portion of the connecting branch pipe 14 is surrounded by the first divided refrigerating medium storage container 1021 to the nth divided refrigerating medium storage container 102n to form an integrated refrigerating medium storage container 100. In this case, it is preferable to surround the coupling device 16. Next, in step ST12, the refrigeration medium FM is supplied into the integrated refrigeration medium storage container 100 through the refrigeration medium supply pipe 108 inserted into the vertical hole 42 from the vertical hole opening 44, freezing at least a portion of the water in the connecting branch pipe 14, and the frozen water is used as a water tap. Next, in step ST13, the fastening device cutting jig 114, which is the fastening device removal jig 113 inserted into the vertical hole 42 from the vertical hole opening 44, is attached to the water supply pipe 10. Next, in step ST14, the fastening device 36 in the coupling device 16 is cut by a fastening device cutting device 116, which is a fastening device removal device 115 inserted into the vertical hole 42 from the vertical hole opening 44 using the cutting device jig 322, making it possible to remove the water supply pipe 10. Next, in step ST15, the water supply pipe 10 is removed from the vertical hole opening 44. This allows the previously used water supply pipe 10 to be removed from the well opening 44. Therefore, by using the jig, all work can be done from the vertical hole opening 44, so there is no need to excavate the soil and workers do not have to work upside down, so the water supply pipe can be removed cheaply and safely.

[0032] Next, we will explain the divided refrigeration medium storage container 102 (first divided refrigeration medium storage container 1021 to nth divided refrigeration medium storage container 102n), container jig 104, refrigeration medium storage container device 106, refrigeration medium supply pipe 108, storage container cutting device 112, fastening device removal jig 113 (fastening device cutting jig 114), and fastening device removal device 115 (fastening device cutting device 116) used in the water supply pipe removal method of this embodiment 1.

[0033] First, the divided refrigeration medium storage container 102 will be described mainly with reference to FIG. The divided refrigeration medium reserve containers 102 have the function of constituting at least an integral refrigeration medium reserve container 100 that constitutes a refrigeration medium reserve chamber 122 that reserves the refrigeration medium FM for freezing the water in the connecting branch pipe 14. The integral refrigeration medium reserve container 100 is constituted by a plurality of divided refrigeration medium reserve containers 102, and by combining these plurality of divided refrigeration medium reserve containers 102, at least the container bottom wall 102b and the container side wall 102S form a pan shape, constituting the refrigeration medium reserve chamber 122 for retaining the refrigeration medium FM. The divided refrigeration medium reserve containers 102 are configured to form one integral refrigeration medium reserve container 100 and one refrigeration medium reserve chamber 122 by combining the first divided refrigeration medium reserve container 1021 to the n-th divided refrigeration medium reserve container 102n to form one refrigeration medium reserve chamber 122 around the connecting branch pipe 14. In this embodiment 1, the divided refrigeration medium storage container 102 is composed of a first divided refrigeration medium storage container 1021 and a second divided refrigeration medium storage container 1022. However, the integrated refrigeration medium storage container 100 can be composed of a combination of three or more divided refrigeration medium storage containers 102n.

[0034] Next, the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 will be described mainly with reference to FIG. Since the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 have the same configuration, the first divided refrigeration medium storage container 1021 will be explained as a representative, and for the second divided refrigeration medium storage container 1022, the initial "first" will be changed to "second", and the last digit of the same symbol will be changed from "1" to "2", and the explanation will be omitted. The first divided refrigeration medium storage container 1021 is configured as a rectangular box with an open top made of a heat insulating material, for example, foamed plastic, preferably polystyrene, divided in two in the longitudinal direction. However, the divided refrigeration medium storage container 102 may be circular, elliptical, or any polygon other than a square when viewed from above. As shown in Figure 2, the first divided refrigerant storage container 1021 has a first semicircular recess 1261 formed in a flat first container bottom wall 1241, which serves as the recess 126. A first side wall 1281, a second side wall 1321, and a third side wall 1341, each having the same predetermined height H1, are provided upward from the edge of the first container bottom wall 1241. The second side wall 1321 faces the first recess 1261. The outer dimensions of the first side wall 1281 and the third side wall 1341 are set to a predetermined storage container width W1, and form a first held portion 1301, which serves as the held portion 130. In this embodiment 1, the end faces of the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 are butted together to form one divided refrigerating medium storage container 102 and one refrigerating medium storage chamber 122. In this case, a sealant such as starch glue is applied to one or both end faces of the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 to prevent gaps from forming between the butting surfaces of the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 and between the connecting branch pipe 14 and the first recess 1261 and the second recess 1262. This is to prevent the injected refrigerating medium FM from leaking from the refrigerating medium storage chamber 122. A first mark 1361 as the mark 136 is provided at approximately the center of the second side wall 1321 of the first divided refrigeration medium storage container 1021.

[0035] Next, the mark 136 will be described. The mark 136 has the function of indicating the relative position of the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 with respect to the connecting branch pipe 14 or the coupling device 16. In this embodiment 1, the mark 136 is a first stopper 1381, which is a cubic stopper 138 provided approximately in the center of the second side wall 1321. The upper surface 138U1 of the first stopper 1381 is arranged so as to be able to come into contact with the lower surface of the first flange 24 provided at the upper end of the connecting branch pipe 14. The second height H2 (FIG. 2(D)) of the upper surface 138U1 relative to the first container bottom wall 1241 is set to a capacity of the refrigerating medium storage chamber 122 sufficient to store a sufficient amount of refrigerating medium FM for the water in the connecting branch pipe 14 to freeze into ice blocks and function as a water faucet within a predetermined time suitable for the work. When the upper surface 138U1 of the first stopper 1381 comes into contact with the lower surface of the first flange (connecting branch pipe side flange) 24, the upper edge 102U1 of the first divided refrigerating medium storage container 1021 is arranged to be positioned above the upper surface of the second flange (supply pipe side flange) 26 of the short pipe 18. This is because the water in the short pipe 18 (supply pipe 10) can also be frozen, preventing water leakage from the supply pipe 10 and allowing the supply pipe 10 to be removed. However, the upper edge 102U1 of the first divided refrigeration medium storage container 1021 can be set below the first flange 24. This is because if water is allowed to flow out of the water supply pipe 10, the water in the connecting branch pipe 14 can be frozen. If the mark 136 has a similar function, it may not be a stopper, but may be a line, color-coded mark, etc. Therefore, the mark 136 and the stopper 138 can be provided separately. It is preferable to attach a first cutting mark 1401, which serves as a cutting mark 140, to the outer surfaces of the first side wall 1281, the second side wall 1321, and the third side wall 1341, to serve as a guide when cutting off the upper part of the divided refrigeration medium storage container 102 using the container cutting jig 222 (electric heater 224).

[0036] Next, the container jig 104 will be described with reference to FIGS. The container jig 104 has the function of holding the divided refrigeration medium storage container 102 and installing it at a predetermined position relative to the connecting branch pipe 14. In this embodiment 1, it also has the function of maintaining the state in which the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 form an integrated refrigeration medium storage container 100. In this embodiment 1, the container jig 104 is composed of a first container jig 1041 and a second container jig 1042. Since the first container jig 1041 and the second container jig 1042 are configured substantially identically, the first container jig 1041 will be described as a representative, and the second container jig 1042 will be described by changing the initial "first" to "second" and changing the last digit of the same reference number from "1" to "2", and will not be described again. The first container jig 1041 is composed of a first refrigeration medium storage container device 1061, which is a refrigeration medium storage container device 106 that holds the first divided refrigeration medium storage container 1021, and a first operating lever 1421, which is an operating lever 142 that operates the refrigeration medium storage container device 106.

[0037] First, the first refrigerating medium storage container device 1061 will be described with reference mainly to FIG. The first refrigeration medium reserve container device 1061 detachably holds the first divided refrigeration medium reserve container 1021 and has the function of maintaining a predetermined positional relationship with the operating lever 142. In this embodiment 1, the first refrigeration medium reserve container device 1061 is composed of a first container holding device 1441 serving as a container holding device 144 configured in a box shape with an opening on the top plate and one side, and a first container holding device holding device 1461 serving as a container holding device holding device 146 to which the first container holding device 1441 is detachably attached.

[0038] Next, the first container holding device 1441 will be described. The first container holding device 1441 has a first holding section 1601, which is a box-shaped holding section 160 with an open top and one side, formed by a holding container bottom wall 1521, a holding container first side wall 1541, a holding container second side wall 1561, and a holding container third side wall 1581. The container holding device spacing W2, which is the inside dimension between the holding container first side wall 1541 and the holding container third side wall 1581, is configured to be slightly narrower than the storage container width W1 of the first divided refrigerating medium storage container 1021. Therefore, when the divided refrigerating medium storage container 102 is pressed into the holding container first side wall 1541 and the holding container third side wall 1581, it is held in place by a predetermined frictional force.

[0039] Next, the first container holding device 1461 will be described. The first container holding device holding device 1461 has the function of holding the first container holding device 1441 in a detachable manner relative to the first operating lever 1421. In this Example 1, the first container holding device holding device 1461 is composed of a first container holding device locking portion 1481 which is the container holding device locking portion 148 formed on the first container holding device 1441, and a first container holding device holding device locking portion 1621 formed on the first container holding device holding device 1461.

[0040] The first container holding device engaging portion 1481 is a first container holding device recess 1661 serving as a container holding device recess 166 having a downward opening and formed by the holding container second side wall 1561 and a downward-facing first container holding device protrusion 1641 serving as a container holding device protrusion 164.

[0041] The first container holding device holding device locking portion 1621 is a first container holding device locking recess 1741, which is a container holding device locking recess 174 having an opening on the upper side, formed by the first lower end portion 1681 of the flat-shaped first container holding device holding device 1461 and the first locking protrusion 1721, which is an upward protrusion 172.

[0042] By inserting and locking first container holding device protrusion 1641 of first container holding device locking portion 1481 into first container holding device locking recess 1741 of first container holding device holding device locking portion 1621, first container holding device 1441 is detachably integrated with first container holding device holding device locking portion 1621. When integrated, one surface of first container holding device 1441 facing holding container second side wall 1561 and one surface of first container holding device 1461 facing holding container second side wall 1561 are configured to stand vertically flush. In this attached state, a gap of first gap dimension D1 is formed between the upper end of first container holding device 1441 and first lower surface 1501 of first container holding device locking portion 1481. As a result, by shifting the first container holding device holding device locking portion 1621 downward relative to the first container holding device 1441, the engagement between the first container holding device protrusion 1641 and the first locking protrusion 1721 is released, and then, by moving the first container holding device holding device locking portion 1621 in a direction away from the first container holding device 1441 (to the right in FIG. 5 ), the first container holding device holding device 1461 can be removed from the first container holding device 1441. In other words, the first operating lever 1421 can be removed from the first divided refrigeration medium storage container 1021 and taken out from the vertical hole 42. Note that, if there is sufficient space in the vertical hole 42, the engagement between the first container holding device protrusion 1641 and the first locking protrusion 1721 can be released by shifting the first container holding device holding device locking portion 1621 laterally relative to the first container holding device 1441. In other words, the first divided refrigeration medium storage container 1021 can be separated from the first operating lever 1421. Therefore, the first container holding device 1441 can be changed to another configuration that performs the same function.

[0043] Next, the first operating lever 1421 will be described. The first operating lever 1421 has the function of operating the first operating part 1761 serving as the operating unit 176 to position the first container holding device holding device locking part 1621, and therefore the first divided refrigerating medium storage container 1021, at a predetermined position relative to the upper end of the connecting branch pipe 14, and to hold the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 so that they maintain the refrigerating medium storage container 102 during the process of pouring the refrigerating medium FM into the integrated refrigerating medium storage container 100. In this embodiment 1, as shown in Figure 3, the first operating lever 1421 is an elongated rod-like shape formed into a roughly crank shape as a whole by a first tip part 1781 serving as the tip part 178, a first intermediate part 1821 serving as the intermediate part 182, and a first operating part 1761 serving as the operating unit 176. In this embodiment 1, a first container holding device holding device 1461 is attached to the lower part of the first tip part 1781, a cross bearing 186 is provided in the middle, and a first operating part 1761 which is the operating part 176 is formed at the upper end part. The first container holding device 1461 and the first operating lever 1421 (first tip portion 1781) are attached by a first position regulating device 1921 which is the position regulating device 192.

[0044] Next, the first position regulating device 1921 will be described. The first position regulating device 1921 regulates the first container holding device holding device 1461 to maintain a predetermined position relative to the first operating lever 1421, and has the function of maintaining the position so that it will change when a force equal to or greater than a predetermined value is applied. In this Example 1, the first position regulating device 1921 is composed of a first high-friction bearing device 1941 serving as the high-friction bearing device 194. The first high-friction bearing device 1941 is composed of a first bearing 1961 serving as a bearing 196 fixed to the first container holding device holding device 146, and a first shaft 1981 serving as a shaft 198 rotatably supported by the first bearing 1961 fixed laterally to the first operating lever 1421. The first shaft 1981 is tightly inserted into the first bearing 1961, and is configured so that the first shaft 1981 and the first bearing 1961 do not rotate relative to each other unless a torque equal to or greater than a predetermined value is applied. The torque equal to or greater than a predetermined value means a torque that causes the first container holding device holding device 1461 to rotate when a force is applied to the first container holding device holding device 1461 to take a predetermined posture while the first divided refrigeration medium storage container 1021 is held by the first container holding device holding device 1461. Therefore, the first position regulating device 1921 can be changed to another configuration that performs the same function.

[0045] Next, the first intermediate portion 1821 will be described. The first intermediate portion 1821 is rod-shaped and connected to the first tip portion 1781 at an obtuse angle, and when the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 are butted together to form the integrated refrigeration medium storage container 100, the first tip portion 1781 and the second tip portion 1782 are configured to be approximately parallel.

[0046] Next, the cross bearing 186 will be described with reference to FIG. The cross bearing 186 has the function of rotatably supporting the intermediate portion between the first operating lever 1421 and the second operating lever 1422. Therefore, the cross bearing 186 can be replaced with another device having the same function. In the first embodiment, the cross bearing 186 is composed of a first bearing portion 2021 disposed at the intermediate portion of the first intermediate portion 1821, a second bearing portion 2022 disposed at the intermediate portion of the second intermediate portion 1822, a first bushing 2041 and a second bushing 2042 disposed therein, a support bolt 206 passing through the first bushing 2041 and the second bushing 2042, a washer 208, and a wing nut 212 threaded onto the support bolt 206. According to the configuration of the cross bearing 186 in the first embodiment, by tightening the wing nut 212, the first bearing portion 2021 and the second bearing portion 2022 can be rotated around the support bolt 206 in a parallel state between the washer 208 and the screw head. On the other hand, by removing the wing nut 212 from the support bolt 206, the first bearing portion 2021 and the second bearing portion 2022, and therefore the first operating lever 1421 and the second operating lever 1422, can be operated separately.

[0047] Next, the first operating section 1761 will be described mainly with reference to FIG. The first operating unit 1761 has the function of positioning the first divided refrigeration medium storage container 1021 by itself via the first intermediate portion 1821 and the first tip portion 1781, and separating the first container holding device 1461 from the first container holding device 1441, and the function of working together with the second operating unit 1762 to maintain the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 as a single unit within the refrigeration medium storage container 100. In this embodiment 1, the first operating unit 1761 is formed as a rod-shaped body with a circular cross section, forms an obtuse angle with the upper end of the first intermediate portion 1821, and is connected via a first horizontal bar 2141, which serves as the horizontal bar 214, so that the first operating unit 1761 stands approximately vertically. Note that the first horizontal bar 2141 is not essential, but if present, it can be conveniently engaged with the water supply pipe 10 or the like during operation. When the first container jig 1041 and the second container jig 1042 are inserted into the vertical hole 42 through the vertical hole opening 44 and positioned around the connecting branch pipe 14, it is preferable that the first operating part 1761 and the second operating part 1762 have a length that protrudes approximately 20 cm from the vertical hole opening 44, as shown in Figure 7.

[0048] Next, the operation of the container jig 104 will be described. First, the container jig 104 separates the first operating lever 1421 and the second operating lever 1422 by loosening the wing nut 212 and removing the support bolt 206 . Next, the first container holding device locking portion 1481 of the first container holding device 1441 is locked to the first container holding device locking portion 1621 of the first container holding device holding device 1461 to form the first refrigeration medium reserve container device 1061. Next, the first held portion 1301 of the first divided refrigeration medium storage container 1021 is pushed into the first holding portion 1601 of the first container holding device 1441 to attach it to the first operating lever 1421, and the second held portion 1302 (see FIG. 15) of the second divided refrigeration medium storage container 1022 is pushed into the second holding portion 1602 (not shown) of the second container holding device 1442 to attach it to the second operating lever 1422. Starch paste is applied to the butting end surfaces of either the first divided refrigeration medium storage container 1021 or the second divided refrigeration medium storage container 1022 to a height of approximately 10 mm. Alternatively, after the first divided refrigeration medium storage container 1021 is pushed into the first holding portion 1601 to be integrated with the first container holding device 1441, the first container holding device locking portion 1481 may be locked to the first container holding device locking portion 1621. The second divided refrigeration medium storage container 1022 is similar. Next, insert the first operating lever 1421 into the vertical hole 42 through the vertical hole opening 44, and position the first divided refrigeration medium storage container 1021 so that the upper part of the connecting branch pipe 14 is positioned in the first recess 1261, as shown in Figure 3 (A). Next, insert the second operating lever 1422 into the vertical hole 42 through the vertical hole opening 44, and position the second divided refrigeration medium storage container 1022 so that the upper part of the connecting branch pipe 14 is positioned in the second recess 1262, as shown in Figure 3 (B). Next, the support bolt 206 is passed through the first bush 2041 and the second bush 2042, a washer 208 is attached, and a wing nut 212 is screwed onto the support bolt 206 to integrate the first operating lever 1421 and the second operating lever 1422, and the first container jig 1041 and the first container jig 1041, thereby forming a pliers-structured storage container maintenance support device 110.

[0049] 7, the first container jig 1041 and the first container jig 1041 are pulled up, and the upper surfaces of the first stopper 1381 and the second stopper 1382 are brought into contact with the lower surface of the first flange 24. This completes the positioning of the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 relative to the connecting branch pipe 14. Next, by rotating the first operating part 1761 of the first operating lever 1421 and the second operating part 1762 of the second operating lever 1422 so that they approach each other, the end faces of the first divided freezing medium storage container 1021 and the second divided freezing medium storage container 1022 are butted together with a force equal to or greater than a predetermined value, deforming the starch paste and closing the gaps between the first divided freezing medium storage container 1021 and the first divided freezing medium storage container 1021, and between the connecting branch pipe 14 and the first divided freezing medium storage container 1021 and the second divided freezing medium storage container 1022, thereby forming the freezing medium storage chamber 122. Because the gaps are closed by the starch paste, the freezing medium FM will not leak from the freezing medium storage chamber 122.

[0050] Next, the refrigerating medium supply pipe 108 will be described with reference to FIG. The refrigeration medium supply pipe 108 has the function of supplying the refrigeration medium FM to the refrigeration medium storage chamber 122, which is composed of the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022. Therefore, the refrigeration medium supply pipe 108 can be replaced with another device having a similar function. In this embodiment 1, the refrigeration medium supply pipe 108 is made of a metal pipe exteriorly coated with insulating material. The refrigeration medium supply pipe 108 is inserted into the vertical hole 42 from the vertical hole opening 44, and supplies the refrigeration medium FM to the refrigeration medium storage chamber 122 from the lower end opening. The upper end is connected to the refrigeration medium container 216, and the refrigeration medium FM discharged from the refrigeration medium container 216 by a pump is supplied to the refrigeration medium supply pipe 108. When the refrigeration medium FM is poured into the integrated refrigeration medium storage container 100, the evaporated refrigeration medium FM precipitates moisture in the atmosphere, generating mist that makes it difficult to see inside the vertical hole 42, and therefore the integrated refrigeration medium storage container 100. Therefore, in order to suck in and discharge the mist, it is preferable to install a suction duct 220 at the bottom of the vertical hole 42. As the refrigeration medium FM, liquid nitrogen with a boiling point of -196°C, liquid oxygen with a boiling point of -183°C, or the like is used.

[0051] Next, the reserved container cutting device 112 will be described with reference to FIG. The storage container cutting device 112 has the function of cutting the container side wall 102S of the integrated refrigeration medium storage container 100 composed of the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022. In this embodiment 1, the storage container cutting device 112 is composed of a container cutting device 218 and a container cutting jig 222.

[0052] The container cutting device 218 has the function of cutting the container side wall 102S of the integrated refrigeration medium storage container 100. In this embodiment, since the first divided refrigeration medium storage container 1021 and the second divided refrigeration medium storage container 1022 are made of polystyrene foam, an electric heater 224 is used. An electric soldering iron is preferably used as the electric heater 224. The electric heater 224 has the advantage of being able to melt and cut off the container side wall 102S of the integrated refrigeration medium storage container 100 by pressing it with a relatively small force. The electric heater 224 melts and cuts off a portion of the side wall of the divided refrigeration medium storage container 102, removing the upper part of the integrated refrigeration medium storage container 100 and lowering the height of the side wall of the divided refrigeration medium storage container 102 to a height that exposes the first flange 24. This allows the fastening device removal jig 113 (fastening device cutting jig 114) to be attached to the first flange 24. Therefore, the reserved container cutting device 112 may be any other device having a similar function.

[0053] Next, the container cutting jig 222 will be described. The container cutting jig 222 has the function of inserting an electric heater 224, which is the container cutting device 218, into the vertical hole 42 through the vertical hole opening 44 and positioning the electric heater 224 at the container side wall 102S portion of the divided refrigeration medium storage container 102. In this embodiment 1, the container cutting jig 222 is composed of a T-shaped rod, and the electric heater 224 is fixed to the tip of the rod. An electric wire 226 is connected to the electric heater 224. Note that the container cutting jig 222 can also employ a cutting device other than the electric heater 224.

[0054] Next, the fastening device removal jig 113 will be described. The fastening device removal jig 113 has the function of supporting a fastening device removal device 115 (fastening device cutting device 116) for removing the fastening device 36. Therefore, other devices having a similar function can be used as the fastening device removal jig 113. In the first embodiment, the fastening device removal jig 113 is the fastening device cutting jig 114, but the fastening device can be removed by means other than cutting. For example, the nut 34 can be broken, rotated, or removed by rotating the bolt 32.

[0055] Next, the fastening device cutting jig 114 will be described mainly with reference to FIG. The fastening device cutting jig 114 has a function of supporting a fastening device removal device 115 (fastening device cutting device 116) for cutting the fastening device 36. Therefore, other devices having a similar function can be used as the fastening device cutting jig 114. The fastening device cutting jig 114 can also be used for cutting fasteners other than those in the vertical hole 42, and by using it in combination with the fastening device removal device 115 (fastening device cutting device 116), the fastening device can be safely cut. In the first embodiment, the fastening device cutting jig 114 is engaged with the water supply pipe 10 on the downstream side. In the first embodiment, the fastening device cutting jig 114 is firmly engaged with the second flange 26 constituting the coupling device 16 and has a function of supporting the fastening device removal device 115 (fastening device cutting device 116). For example, the fastening device cutting jig 114 can be attached to the short pipe 18 on the downstream side of the connecting branch pipe 14. The fastening device cutting jig 114 is not an essential component of the present invention. However, when the fastening device cutting jig 114 is used, there is an advantage that the fastening device 36 can be cut safely and easily. In this Example 1, the fastening device cutting jig 114 is composed of a holding frame 232, a support portion 234, and a cutting jig locking portion 236.

[0056] First, the holding frame 232 will be described. The holding frame 232 is detachably attached to the second flange 26 constituting the coupling device 16 and has the function of fixing the support portion 234 and the cutting jig locking portion 236 to the coupling device 16. In this embodiment 1, the holding frame 232 is composed of a semicircular first holding frame 2321 and a second holding frame 2322. One end of each of the first holding frame 2321 and the second holding frame 2322 is rotatably attached to the support shaft 238, and the tips of the other end portions are configured to be able to contact or separate from each other. The other ends of the first holding frame 2321 and the second holding frame 2322 are each formed with a first fastening protrusion 2421 and a second fastening protrusion 2422 as fastening protrusions 242 that protrude in the radial direction by a predetermined length. A fastening device 244 is configured using the first fastening protrusion 2421 and the second fastening protrusion 2422. In this embodiment 1, the retaining frame 232 is attached to the short pipe 18 immediately downstream of the connecting branch pipe 14, but it may also be attached to the second short pipe 18 or to the mounting flange of the underground water hydrant 10F. In this case, the connecting branch pipe 14 includes the second short pipe 18 or the short pipe 18 immediately before the underground water hydrant 10F.

[0057] Next, the clamping device 244 will be described. The fastening device 244 has the function of bringing the first fastening protrusion 2421 and the second fastening protrusion 2422 closer together, thereby bringing the first holding frame 2321 and the second holding frame 2322 into close contact with the outer circumferential surface of the second flange 26, and firmly fixing the holding frame 232 to the second flange 26. In the first embodiment, the fastening device 244 is composed of a fastening screw device 246 configured using the first fastening protrusion 2421 and a receiving groove 248 formed in the second fastening protrusion 2422. However, the fastening device 244 can be replaced with another device having a similar function.

[0058] Next, the clamping screw device 246 will be described. The clamping screw device 246 is formed in the first clamping projection 2421 and is composed of a horizontal U-shaped groove 252 that is flush with the receiving groove 248, a clamping bolt 256 that has one end fixed to a support shaft 254 that vertically crosses the U-shaped groove 252 and is rotatable within the U-shaped groove 252, a washer 258 fitted onto the clamping bolt 256, and a clamping nut 262 threaded onto the clamping bolt 256. The clamping bolt 256 can be rotated together with the support shaft 254 within a horizontal plane and inserted into the receiving groove 248. After the clamping bolt 256 is inserted into the receiving groove 248, the clamping nut 262 is tightened to bring the first clamping protrusion 2421 and the second clamping protrusion 2422 closer together via the washer 258, thereby bringing the first retaining frame 2321 and the second retaining frame 2322 into close contact with the outer circumferential surface of the second flange 26. The clamping nut 262 is preferably tightened using, for example, an impact wrench 264 shown in FIG.

[0059] Next, the impact wrench 264 will be described with reference to FIG. The impact wrench 264 is preferably an air impact wrench that is selectively rotated forward or backward at a predetermined torque using known compressed air, but may also be an electric impact wrench. The impact wrench 264 is inserted into the vertical hole 42 from the vertical hole opening 44 using a rod-shaped impact jig 266, and a socket 268 at the tip is fitted into the clamping nut 262 and rotated.

[0060] Next, the support portion 234 will be described. The support portion 234 has a function of fixing the cutting jig locking portion 236 in a predetermined positional relationship to the holding frame 232. In the present Example 1, the support portion 234 is provided in the first holding frame 2321 with one first support portion 2341 and in the second holding frame 2322 with one second support portion 2342, and since they have the same configuration, the first support portion 2341 will be described as a representative, and the second support portion 2342 will be described with the initial "first" changed to "second" and the last digit of the same reference numeral changed from "1" to "2", and the description will be omitted.

[0061] The first support portion 2341 is composed of an eleventh support plate 2721 and a twelfth support plate 2741 that protrude radially from the first holding frame 2321 at a predetermined distance and a predetermined interval, and a first jig fixing plate 2761 that is fixed laterally to the tips of the eleventh support plate 2721 and the twelfth support plate 2741. The eleventh support plate 2721 and the twelfth support plate 2741 are formed with an eleventh locking hole 2821 and a twelfth locking hole 2831 for locking a fastening device cutting jig 278. An eleventh cutting jig locking portion 23611 and a twelfth cutting jig locking portion 23612 that form the cutting jig locking portion 236 that is the fastening device removal jig 113 are fixed to both ends of the first jig fixing plate 2761. The first support portion 2341 can be replaced with another device having a similar function.

[0062] The fastening device removal jig 113 has the function of locking the fastening device removal device 115 and facilitating removal of the fastening device 36. In this embodiment 1, the fastening device removal jig 113 is the cutting jig locking portion 236, and the fastening device removal device 115 is the fastening device cutting device 116. The fastening device removal device 115 is not limited to a cutting device, but also includes a nut cutter 576 described in detail in embodiment 8, as well as devices having similar functions. Next, the cutting jig engaging portion 236, which is the fastening device removing jig 113, will be described with reference to FIG. The cutting jig locking portion 236 has a function of locking the fastening device removal device 115 (fastening device cutting device 116) so that it can move while maintaining a predetermined positional relationship with respect to the water supply pipe 10, or in this embodiment, the fastening device 36 (second flange 26). In this embodiment, the predetermined positional relationship means that when the fastening device removal device 115 (fastening device cutting device 116) is rotated around the cutting jig locking portion 236 while being locked to the cutting jig locking portion 236, the fastening device removal device 115 (fastening device cutting device 116) overlaps with the position where the fastening device 36 is located. In other words, this means a position where one fastening device 36 can be cut by the fastening device removal device 115 (fastening device cutting device 116) when locked to one cutting jig locking portion 236. The cutting jig locking portion 236 has a first cutting jig locking portion 2361 attached to a first support portion 2341 and a second cutting jig locking portion 2362 attached to a second support portion 2342. Because the first cutting jig locking portion 2361 and the second cutting jig locking portion 2362 have the same configuration, the first cutting jig locking portion 2361 will be described as a representative, and the second cutting jig locking portion 2362 will be described with the initial "first" changed to "second" and the last digit of the same reference number changed from "1" to "2", and will not be described again. An eleventh cutting jig locking portion 23611 is fixed to one end of the first jig fixing plate 2761, and a twelfth cutting jig locking portion 23612 is fixed to the other end. Since the 11th cutting jig engaging portion 23611 and the 12th cutting jig engaging portion 23612 have the same configuration, the 11th cutting jig engaging portion 23611 will be explained as a representative, and as for the 12th cutting jig engaging portion 23612, the initial "11th" will be changed to "12th", and the last digit of the same symbol will be changed from "11" to "12", and the explanation will be omitted. The eleventh cutting jig locking portion 23611 has a cylindrical shape, and an eleventh ring-shaped step portion 28811 is formed in the middle by an eleventh large diameter cylindrical portion 28411 and an eleventh small diameter cylindrical portion 28611. In order to position the cutting jig locking portion 236, a cutting jig mark 292 is provided on the holding frame 232.

[0063] Next, the cutting jig mark 292 will be described. The cutting jig marker 292 has the function of indicating the approximate position of the cutting jig locking portion 236 relative to the fastening device 36. In this Example 1, it is configured by a marker plate 295 with a top 293 fixed to the upper surface of the holding frame 232 and set in a direction toward the center of the holding frame 232. In this Example 1, the fastening device 36 is four bolts arranged at equal angles on the second flange 26, so when the top 293 points toward approximately the center between the fastening devices 36, the first cutting jig locking portion 2361 is configured to be in a predetermined position. In other words, the fastening device removal device 115 (fastening device cutting device 116) is positioned to cut the fastening device 36. In this Example 1, the cutting jig marker 292 is provided in four locations: a first cutting jig marker 2921 provided opposite the first support portion 2341, a second cutting jig marker 2922 provided opposite the second support portion 2342, a third cutting jig marker 2923 provided opposite the support shaft 238, and a fourth cutting jig marker 2924 provided opposite the clamping device 244. The third cutting jig marker 2923 and the fourth cutting jig marker 2924 are formed by combining trapezoidal cutting jig marker pieces provided on the first holding frame 2321 and the second holding frame 2322, respectively. That is, the third cutting jig mark 2923 is composed of a 31st cutting jig mark piece 29231 provided on the first holding frame 2321 and a 32nd cutting jig mark piece 29232 provided on the second holding frame 2322. The fourth cutting jig mark 2924 is composed of a 41st cutting jig mark piece 29241 provided on the first holding frame 2321 and a 42nd cutting jig mark piece 29242 provided on the second holding frame 2322. However, it is sufficient to provide at least one cutting jig mark 292. The third cutting jig mark 2923 and the fourth cutting jig mark 2924 are provided only on the upper sides of the first holding frame 2321 and the second holding frame 2322. When attaching the holding frame 232 to the second flange 26, there is an advantage that the holding frame 232 can be attached to the second flange 26 using the second flange 26 as support. In the first embodiment, the first cutting jig mark 2921 and the second cutting jig mark 2922 also serve as positioning devices 294 for the holding frame 232 relative to the coupling device 16 (second flange 26).

[0064] Next, the positioning device 294 will be described. The positioning device 294 has a function of restricting the position of the holding frame 232 in the thickness direction relative to the coupling device 16 so as not to be misaligned. In this Example 1, the positioning device 294 includes a first positioning device 2941 provided on the first holding frame 2321 and a second positioning device 2942 provided on the second holding frame 2322. Since the first positioning device 2941 and the second positioning device 2942 have the same configuration, the second positioning device 2942 will be explained as a representative, and the first positioning device 2941 will be explained by changing the initial "second" to "first" and changing the last digit of the same reference number from "2" to "1", and the explanation will be omitted. The second positioning device 2942 is composed of a second cutting jig mark 2922 and a second positioning plate 2962, which is a positioning plate 296 of the same shape as the second cutting jig mark 2922 and is fixed to the underside of the second holding frame 2322. In other words, the second positioning device 2942 is composed of two plate-like bodies arranged in parallel with the same distance as the height of the second holding frame 2322, and defines a second positioning space 2982 (first positioning space 2981) which is a positioning space 298 that can receive the second flange 26 without significant rattle. The positioning plate 296 is a plate-like body that is slightly thinner than the thickness of the packing 28. Therefore, when attached to the second flange 26, the positioning plate 296 can enter between the first flange 24 and the second flange 26. Since the first positioning device 2941 restricts the vertical movement of the first holding frame 2321 relative to the second flange 26, and the second positioning device 2942 restricts the vertical movement of the second holding frame 2322 relative to the second flange 26, even if a large force is applied to the fastening device cutting jig 114, the second flange 26 and the fastening device cutting jig 114 can maintain a predetermined positional relationship.

[0065] Next, the fastener cutting jig 278 will be described with reference mainly to FIG. The jig 278 for a fastening device cutting jig has the function of a jig used when inserting the fastening device cutting jig 114 from the vertical hole opening 44 into the vertical hole 42 and attaching it to the water supply pipe 10 (joint device 16). Therefore, it can be replaced with another device having the same function as the jig 278 for a fastening device cutting jig. In this Example 1, the jig 278 for a fastening device cutting jig is made up of a first fastening device cutting jig jig 2781 and a second fastening device cutting jig 2782. Since the first fastening device cutting jig 2781 and the second fastening device cutting jig 2782 have the same configuration, the first fastening device cutting jig 2781 will be described as a representative, and the second positioning device 2942 will have its initial "first" changed to "second" and the last digit of the same reference number changed from "1" to "2", and its description will be omitted. The first fastening device cutting jig 2781 is composed of a first rod 3021 having a predetermined length and a first hook 3041 attached to the tip of the rod. The first hook 3041 can pass through the eleventh locking hole 2821 and the twelfth locking hole 2831, and the first hook 3041 and the second hook 3042 can be used to attach the fastening device cutting jig 114 to the connecting branch pipe 14, or the second flange 26 in this Example 1, while maintaining the jig in a horizontal position.

[0066] Next, the operation of attaching the fastening device cutting jig 114 to the second flange 26 of the joint device 16 will be described. First, outside the vertical hole opening 44, the first hook 3041 is engaged with the eleventh locking hole 2821 and the twelfth locking hole 2831, and the second hook 3042 is engaged with the twenty-first locking hole 2822 and the twenty-second locking hole 2832. Next, the fastening device cutting jig 114 is lifted by holding the first rod body 3021 and the second rod body 3022, and then inserted into the vertical hole 42 through the vertical hole opening 44. In this case, the first holding frame 2321 and the second holding frame 2322 are rotated around the support shaft 238 to leave a gap between the first fastening protrusion 2421 and the second fastening protrusion 2422, and the jig is lowered into the vertical hole 42 while maintaining a horizontal position so that it can be easily attached to the second flange 26. First, with the lower surfaces of the 31st cutting jig mark piece 29231 and the 32nd cutting jig mark piece 29232 in contact with the upper surface of the second flange 26, the jig 2781 for the first fastening device cutting jig and the jig 2782 for the second fastening device cutting jig are operated to rotate the support shaft 238 as a fulcrum in a direction in which the tips of the first holding frame 2321 and the second holding frame 2322 close. During this process, the second flange 26 is clamped with the second cutting jig mark 2922 positioned above the second flange 26 and the second positioning plate 2962 positioned below the second flange 26. Similarly, the second flange 26 is clamped with the first cutting jig mark 2921 positioned above the second flange 26 and the first positioning plate 2961 positioned below the second flange 26. Then, the 41st cutting jig mark piece 29241 and the 42nd cutting jig mark piece 29242 come into contact with the upper surface of the second flange 26, and the first tightening protrusion 2421 and the second tightening protrusion 2422 are brought closer to a predetermined distance. The jig 2781 for the first fastening device cutting jig and the jig 2782 for the second fastening device cutting jig are operated to bring the first tightening protrusion 2421 and the second tightening protrusion 2422 closer to each other so that the distance between them is shorter than the positions of the washer 258 and the tightening nut 262 engaged with the tightening bolt 256. In this state, the first hook 3041 of the jig 2781 for the first fastening device cutting jig is removed from the eleventh locking hole 2821 and the twelfth locking hole 2831. Similarly, the second hook 3042 of the jig 2782 for the second fastening device cutting jig is removed from the twenty-first locking hole 2822 and the twenty-second locking hole 2832. Next, using first fastening device cutting jig 2781 or second fastening device cutting jig 2782 , tightening bolt 256 is rotated around support shaft 254 , and tightening bolt 256 is inserted into receiving groove 248 . Next, the impact wrench 264 is inserted into the vertical hole 42 through the vertical hole opening 44 using the impact jig 266, and the socket 268 is fitted into the tightening nut 262. Then, the impact wrench 264 is driven to tighten the tightening nut 262, thereby firmly fixing the fastening device cutting jig 114 to the first holding frame 2321 and the second holding frame 2322.

[0067] Next, the fastener removal device 115 will be described. The fastener removal device 115 functions to allow the fastener 36 to be removed from the coupling device 16 . "Removable" refers to a function that allows the fastening device 36 to be removed. For example, in the case where the fastening device 36 is a bolt 32 and a nut 34, if the nut 34 can be loosened, the nut 34 can be loosened and removed from the bolt 32, and if the nut 34 cannot be loosened, the bolt 32 can be cut or broken, and the bolt 32 and the nut 34 can be removed separately.

[0068] Next, the fastener disconnecting device 116 will be described mainly with reference to FIG. The fastening device cutting device 116 has the function of cutting the fastening device 36 of the coupling device 16. The fastening device 36 is usually composed of a bolt 32 and a nut 34, and in many cases, since it has been installed for a long time and therefore cannot be unthreaded, it is easiest to cut it, and it is cut by the fastening device cutting device 116. In this embodiment 1, the fastening device cutting device 116 includes at least a cutting locking portion 306 that is rotatably and detachably attached to the cutting jig locking portion 236 of the fastening device cutting jig 114, an arm portion 308 that is connected to the cutting jig locking portion 236, and a cutting device 310 fixed to the arm portion 308. In this embodiment 1, the cutting device 310 is a rotary blade 312 that is rotatably supported. However, various cutting devices 310 can be adopted.

[0069] Next, the disconnection locking portion 306 will be described. The cutting locking portion 306 has a function of locking the fastening device cutting device 116 to the fastening device cutting jig 114, facilitating the cutting operation of the fastening device cutting device 116. The cutting locking portion 306 in this embodiment 1 has a function of being rotatably and detachably attached to the cutting jig locking portion 236. Specifically, the cutting locking portion 306 is configured as a cylinder having a circular fitting hole 314 formed therein that fits into the small diameter cylindrical portion 286 of the cutting jig locking portion 236. When the cutting locking portion 306 is fitted into the small diameter cylindrical portion 286, the lower end surface of the cutting locking portion 306 comes into contact with the eleventh step portion 2881, thereby positioning the cutting locking portion 306 in the up-down direction and supporting it rotatably around the axis of the small diameter cylindrical portion 286 without rattle. The cutting locking portion 306 can be replaced with another device having a similar function.

[0070] Next, the arm portion 308 will be described. The arm 308 has the function of restricting the rotary blade 312 to a predetermined position relative to the cutting locking portion 306. In this embodiment 1, the arm 308 is a plate-shaped body, one end of which is fixed to the cutting locking portion 306, and the other end of which is fixed to a rotary blade bearing 318 that rotatably supports a rotary shaft 316 of the rotary blade 312. The rotary shaft 316 is preferably attached to the rotary blade bearing 318 so that its axial position can be adjusted. This is because when cutting the fastening device 36, it may not be possible to cut between the first flange 24 and the second flange 26, and it may be necessary to cut the head of the bolt 32 or the nut 34 that constitutes the fastening device 36. A cutting device jig 322 is fixed to the arm 308. The length L of the arm 308 is set so that when the rotary blade 312 is rotated around the 11th small diameter cylindrical portion 28611 of the first cutting tool engaging portion 2361, the rotary blade 312 traces a trajectory that crosses the fastening device 36 (bolt 32).

[0071] Next, the cutting device 310 will be described mainly with reference to FIG. The cutting device 310 has a function of removing the fastening device 36. In the first embodiment, the fastening device 36 is the bolt 32 and the nut 34, so the cutting device 310 has a function of cutting the bolt 32. Specifically, a thin, disk-shaped rotary blade 312 is used. However, the cutting device 310 can be replaced with another device having a similar function.

[0072] The rotating shaft 316 is connected to the output shaft of a cutting motor 326 by a known flexible shaft 324. The cutting motor 326 can be configured by an electric motor, an air motor, or the like.

[0073] Next, the cutting device jig 322 will be described. The cutting device jig 322 has the function of attaching the fastening device cutting device 116 to the fastening device cutting jig 114 and pressing the cutting device 310 against the fastening device 36 in order to cut the fastening device 36. In this Example 1, the cutting device jig 322 is formed of a T-shaped rod, and the tip of the rod is fixed to the arm portion 308. When attaching the fastener cutting device 116 to the fastener cutting jig 114, the fastener cutting device 116 is inserted into the vertical hole 42 through the vertical hole opening 44 using the cutting device jig 322. Next, the fitting hole 314 is fitted onto the small-diameter cylindrical portion 286, allowing the cutting device 310 to rotate around the small-diameter cylindrical portion 286. When cutting the fastener 36, the cutting motor 326 is rotated to rotate the rotary blade 312 via the flexible shaft 324, causing the arm portion 308 to rotate around the small-diameter cylindrical portion 286, and the cutting device jig 322 is inserted between the first flange 24 and the second flange 26 and pressed against the tightening bolt 256 to cut it. The cutting device jig 322 can be attached to the arm portion 308 extending from the rotary blade bearing 318 at a position farther from the cutting engagement portion 306 than the rotary blade bearing 318. In this case, there is an advantage that the pressing force of rotary blade 312 against fastening bolt 256 can be increased. When fastening bolt 256 is cut, surrounding packing 28 is also cut.

[0074] Next, the operation of cutting the fastening device 36 using the fastening device cutting device 116 will be described. First, the fastening device cutting device 116 is attached to the cutting jig locking portion 236. Specifically, the fastening device cutting device 116 is inserted into the vertical hole 42 from the vertical hole opening 44 using the cutting device jig 322, and then the eleventh small diameter cylindrical portion 28611 of the first cutting jig locking portion 2361 is fitted into the fitting hole 314 of the cutting locking portion 306. Next, the cutting motor 326 is started to rotate the rotary blade 312 in a predetermined direction via the flexible shaft 324 and the rotary shaft 316 . Next, the cutting device jig 322 is operated to rotate the arm portion 308 around the small diameter cylindrical portion 286, and the rotary blade 312 is pressed against the circumferential surface of the clamping bolt 256 serving as the fastening device 36 to cut it.

[0075] Next, a method for removing the water supply pipe 10 according to the present invention will be described with reference to FIGS. First, as shown in FIG. 15(A), the container jig 104 is separated into a first operating lever 1421 and a second operating lever 1422 by loosening the wing nut 212 and removing the support bolt 206.

[0076] Secondly, as shown in Figure 15(B), the first container holding device engaging portion 1481 of the first container holding device 1441 is engaged with the first container holding device holding device engaging portion 1621 of the first container holding device holding device 1461 to form the first refrigeration medium storage container device 1061.

[0077] Third, as shown in Figure 15 (C), the first held portion 1301 of the first divided refrigeration medium holding container 1021 is pushed into the first holding portion 1601 of the first container holding device 1441 to attach it to the first operating lever 1421, and the second held portion 1302 (not shown) of the second divided refrigeration medium holding container 1022 is pushed into the second holding portion 1602 (not shown) of the second container holding device 1442 to attach it to the second operating lever 1422. Starch paste is applied to the butted end faces of either the first divided refrigeration medium storage container 1021 or the second divided refrigeration medium storage container 1022 to a height of about 10 mm.

[0078] Fourth, as shown in Figure 15 (D), insert the first operating lever 1421 into the vertical hole 42 through the vertical hole opening 44, and position the first divided refrigeration medium storage container 1021 so that the upper part of the connecting branch pipe 14 is positioned in the first recess 1261.

[0079] Fifth, insert the second operating lever 1422 into the vertical hole 42 through the vertical hole opening 44, and determine the position of the second divided refrigeration medium storage container 1022 so that the upper part of the connecting branch pipe 14 is positioned in the second recess 1262, as shown in Figure 16 (E). Note that after attaching the first divided refrigeration medium storage container 1021 in the third step to the first operating lever 1421, step 4 can be performed, and after attaching the second divided refrigeration medium storage container 1022 in the third step to the second operating lever 1422, step 5 can be performed.

[0080] Sixth, as shown in Figure 16 (F), the support bolt 206 is passed through the first bush 2041 and the second bush 2042, a washer 208 is attached, and the wing nut 212 is tightened to integrate the first operating lever 1421 and the second operating lever 1422, thereby forming a pliers-structured storage container maintenance support device 110.

[0081] Seventh, as shown in FIG. 16(G), the first container jig 1041 and the second container jig 1042 are pulled up so that the upper surfaces of the first stopper 1381 and the second stopper 1382 come into contact with the lower surface of the first flange 24.

[0082] 16(H), by rotating the first operating lever 1421 and the second operating lever 1422 so that they approach each other, the end faces of the first divided refrigerating medium storage container 1021 and the second divided refrigerating medium storage container 1022 are butted together as shown in Figures 17(I) (J), and starch paste is sandwiched between them, closing the gaps between the first divided refrigerating medium storage container 1021 and the first divided refrigerating medium storage container 1021 and between the connecting branch pipe 14 and the first divided refrigerating medium storage container 1021 or the second divided refrigerating medium storage container 1022, thereby forming a square-shaped refrigerating medium storage chamber 122. Because the gaps are closed by the starch paste, the refrigerating medium FM will not leak from the refrigerating medium storage chamber 122.

[0083] Ninth, as shown in FIG. 17(K), a suction duct 220 is installed from the vertical hole opening 44 to the bottom of the vertical hole 42, so that air at the bottom of the vertical hole 42 is sucked in and exhausted.

[0084] Tenth, as shown in FIG. 16(L), the refrigerating medium supply pipe 108 is inserted from the vertical hole opening 44 into the refrigerating medium storage chamber 122 in the vertical hole 42. Then, with a force applied so that the first operating lever 1421 and the second operating lever 1422 move closer together, the refrigerating medium FM is supplied from the lower end opening of the refrigerating medium supply pipe 108 to the refrigerating medium storage chamber 122 up to a position equivalent to the first flange 24. The refrigerating medium FM is stored in the refrigerating medium storage chamber 122. As a result, the water in the connecting branch pipe 14 freezes, and after a predetermined time, the ice blocks IB become a water plug and no longer flow out to the water supply pipe 10. This ice block water plug state can be confirmed by time management or by measuring the pressure in the water supply pipe 10. Furthermore, the starch paste is frozen by the freezing medium FM, and the end faces of the first divided freezing medium storage container 1021 and the second divided freezing medium storage container 1022 become fixed, and the connection branch pipe 14 and the first recess 1261 and the second recess 1262 also become fixed, so that the second divided freezing medium storage container 1022 is fixed at the upper end of the connection branch pipe 14 without using the first operating lever 1421 and the second operating lever 1422. The mist generated by the evaporation of the freezing medium FM is exhausted from the vertical hole 42 by suction from the suction duct 220, allowing work to be done while being visually observed.

[0085] 17(M), after the support bolt 206 is pulled out to enable the first operating lever 1421 and the second operating lever 1422 to be operated individually, the first operating lever 1421 is operated to shift the first container holding device holding device 1461 downward relative to the first container holding device 1441 to disengage the first container holding device holding device locking portion 1621 from the first container holding device locking portion 1481, and then the first container jig 1041 is shifted laterally and then pulled up from the vertical hole opening 44. Similarly, the second container jig 1042 is pulled up from the vertical hole opening 44.

[0086] Twelfth, as shown in FIG. 18(N), the freezing medium FM is supplied from the freezing medium supply pipe 108 to the freezing medium storage chamber 122 until it reaches the same level as the second flange 26. As a result, the freezing medium FM in the short pipe 18 is stored in the freezing medium storage chamber 122. As a result, the ice blocks IB in the connecting branch pipe 14 grow and freeze inside the water supply pipe 10 (short pipe 18). After a predetermined time, the ice blocks IB also form a water plug in the water supply pipe 10 and no longer flow out from the water supply pipe 10 side. The state of this ice block IB can be confirmed by time management or by measuring the pressure inside the water supply pipe 10. After this, the freezing medium supply pipe 108 is pulled up and removed from the vertical hole 42. Note that this step 12 is unnecessary if water flow from the water supply pipe 10 is permitted. However, there is an advantage in that the water flowing from the water supply pipe 10 does not stagnate inside the vertical hole 42, so that subsequent work is not affected.

[0087] Twelfth, as shown in FIG. 18(O), the container cutting jig 222 is operated to insert the container cutting device 218 into the vertical hole 42 through the vertical hole opening 44, and the side wall of the divided refrigerating medium storage container 102 is cut at a predetermined depth from the upper end. In other words, the container side wall 102S of the divided refrigerating medium storage container 102 is cut off to a predetermined height from the container bottom wall 102b. In this embodiment, the container cutting device 218 is an electric heater 224, and the electric heater 224 melts and cuts off the container side wall 102S of the divided refrigerating medium storage container 102, which is made of polystyrene foam. The predetermined height from the container bottom wall 102b is a height that does not interfere with the installation of the fastening device cutting jig 114. Specifically, the upper portion of the container side wall 102S of the divided refrigerating medium storage container 102 is cut off slightly below the first stopper 1381 and the second stopper 1382.

[0088] 18(P), the fastening device cutting jig 114 is inserted into the vertical hole 42 from the vertical hole opening 44 using the jig 2781 for the first fastening device cutting jig and the jig 2782 for the second fastening device cutting jig. Then, with the lower surfaces of the 31st cutting jig mark piece 29231 and the 32nd cutting jig mark piece 29232 in contact with the upper surface of the second flange 26, the jig 2781 for the first fastening device cutting jig and the jig 2782 for the second fastening device cutting jig are operated to rotate the support shaft 238 as a fulcrum in a direction in which the tips of the first holding frame 2321 and the second holding frame 2322 close. During this process, the second flange 26 is clamped with the jig 2782 for the second fastening device cutting jig positioned above the second flange 26 and the second positioning plate 2962 positioned below the second flange 26. Similarly, the second flange 26 is clamped with the first fastening device cutting jig jig 2781 positioned above the second flange 26 and the first positioning plate 2961 positioned below the second flange 26. Then, the 41st cutting jig mark piece 29241 and the 42nd cutting jig mark piece 29242 come into contact with the upper surface of the second flange 26, and the first tightening protrusion 2421 and the second tightening protrusion 2422 are brought close to a predetermined distance. In this state, the first hook 3041 of the jig 2781 for the first fastening device cutting jig is removed from the eleventh locking hole 2821 and the twelfth locking hole 2831, and the jig 2782 for the second fastening device cutting jig is removed from the 21st locking hole 2822 and the 22nd locking hole 2832, and then removed from the vertical hole 42. In this state, if the first support portion 2341 and the second support portion 2342 are positioned apart, the jig 2781 for the first fastening device cutting jig or the jig 2782 for the second fastening device cutting jig can be used to operate the first support portion 2341 and the second support portion 2342 and perform a strike or the like to bring them closer together. Next, using first fastening device cutting jig 2781 or second fastening device cutting jig 2782 , tightening bolt 256 is rotated around support shaft 254 , and tightening bolt 256 is inserted into receiving groove 248 . Next, the impact jig 266 is operated to insert the impact wrench 264 into the vertical hole 42 through the vertical hole opening 44, and then the socket 268 of the impact wrench 264 is fitted into the clamping nut 262. Next, the impact wrench 264 is driven to tighten the clamping nut 262, thereby fixing the first holding frame 2321 and the second holding frame 2322 to the second flange 26. This fixes the fastening device cutting jig 114 to the water supply pipe 10 (second flange 26).

[0089] 14. As shown in FIG. 19(q), the cutting device jig 322 is operated to insert the fastening device cutting device 116 into the vertical hole 42 through the vertical hole opening 44, and then the mating hole 314 of the cutting locking portion 306 is fitted into the 11th small diameter cylindrical portion 28611 of the first cutting jig locking portion 2361. Next, the cutting motor 326 is started to rotate the rotary blade 312 in a predetermined direction via the flexible shaft 324 and the rotary shaft 316 . Next, the cutting device jig 322 is operated to rotate the arm portion 308 around the eleventh small diameter cylindrical portion 28611, and the rotary blade 312 is pressed against the circumferential surface of the first tightening bolt 2561 serving as the fastening device 36 to cut it. Next, the cutting device jig 322 is operated to fit the twelfth small diameter cylindrical portion 28612 into the fitting hole 314, and then the rotary blade 312 is pressed against the circumferential surface of the second tightening bolt 2562 to cut it. Next, the cutting device jig 322 is operated to fit the fitting hole 314 onto the 21st small diameter cylindrical portion 28621, and then the rotary blade 312 is pressed against the circumferential surface of the third tightening bolt 2563 to cut it. Next, the cutting device jig 322 is operated to fit the fitting hole 314 onto the 22nd small diameter cylindrical portion 28622, and then the rotary blade 312 is pressed against the circumferential surface of the third tightening bolt 2563 to cut it. This separates the water supply pipe 10 from the connecting branch pipe 14. The tightening bolts 256 can be cut in any order. Next, the cutting device jig 322 is pulled up and the fastener cutting device 116 is drawn out from the vertical hole 42 via the vertical hole opening 44. Normally, the tightening bolt 256 at the packing 28 portion is cut, but there are cases where it is not possible to cut at the packing 28 portion due to installation conditions, etc. In such cases, the position of the rotary blade 312 can be adjusted so that it cuts the head of the tightening bolt 256 or the tightening nut 262 portion. The position of the rotary blade 312 can also be adjusted by changing the position of the cutting jig locking portion 236.

[0090] The water supply pipe 10 can then be removed from the well 42 via the well opening 44 by pulling it upward. [Example]

[0091] Next, a second embodiment will be described with reference to the flowchart shown in Fig. 20. In the flowchart shown in Fig. 20, steps ST11 to ST15 are the same as steps ST11 to ST15 in the first embodiment, so only step ST26, which is different, will be described.

[0092] In step ST26 following step ST15, the new water supply pipe 10 inserted into the vertical hole 42 from the vertical hole opening 44 is installed relative to the connecting branch pipe 14. Next, the new water supply pipe 10 and the connecting branch pipe 14 are fastened together using the fastening device 36 attached to the fastening device jig 334.

[0093] Next, the fastening device jig 334 will be described with reference to FIG. The fastening device jig 334 has the function of fastening the fastening device 36 that fastens the coupling device 16. Since the present embodiment 2 has most of the same parts as the embodiment 1, the same parts are given the same reference numerals, and only the configurations that differ from the embodiment 1 will be described.

[0094] In the second embodiment, the fastening device 36 is a bolt 32 and a nut 34, so a bolt jig 328 and a nut jig 332 are provided as the fastening device jig 334. First, the bolt jig 328 will be described. The bolt jig 328 has the function of holding the bolt 32 and inserting the bolt 32 into the vertical hole 42 from the vertical hole opening 44, and then passing the bolt through the first through hole 24H formed in the first flange 24 of the coupling device 16 and the second through hole 26H formed in the second flange 26. In this Example 1, the bolt jig 328 is composed of a wrench portion 328R into which the hexagonal bolt head 32H of the bolt 32 is fitted, and an L-shaped rod-shaped wrench operating portion 328H. The bottom hole of the wrench portion 328R is closed by the wrench operating portion 328H. When using the bolt jig 328 to pass the bolt 32 through the first through hole 24H and the second through hole 26H, the bolt jig 328 is inserted into the vertical hole 42 from the vertical hole opening 44 with the bolt head 32H fitted into the wrench portion 328R, and the bolt 32 is passed through the first through hole 24H and the second through hole 26H from below the first flange 24. Therefore, the bolt jig 328 can be replaced with another device having a similar function. After removing the old water supply pipe 10, any remaining part of the packing 28 remaining on the upper surface of the first flange 24 is removed using tweezers, a grinder, or the like. A new packing 28 is attached to the underside of the second flange 26 of the new water supply pipe 10 so that it will not easily come off, and then inserted into the vertical hole 42 through the vertical hole opening 44 and placed on the first flange 24. The rod body is then inserted into the second through hole 26H and the first through hole 24H, and the second through hole 26H and the first through hole 24H are aligned in position.

[0095] Next, the nut jig 332 will be described. The nut jig 332 holds the nut 34, inserts it into the vertical hole 42 through the vertical hole opening 44, and threads it onto the tip of the bolt 32 that has passed through it. In this embodiment 1, the nut jig 332 has a rod-shaped operating unit 332H connected to a hexagon socket wrench 332R. It is preferable to magnetize the hexagon socket wrench 332R or coat it with an adhesive material so that the installed nut 34 does not easily fall off. When installing the nut 34, first install the nut 34 into the hexagon socket wrench 332R, then insert it into the vertical hole 42 through the vertical hole opening 44 and thread it onto the tip of the bolt 32. Therefore, the bolt jig 328 can be replaced with another device having a similar function. The washer 35 can be installed by grasping it with remotely controlled tweezers (not shown) or the like. Therefore, a new water supply pipe 10 can be installed. [Example]

[0096] Next, a water supply pipe removal method according to the third embodiment will be described with reference to the flowchart shown in Fig. 27. In the flowchart shown in Fig. 27, steps ST11 to ST12 are the same as steps ST11 to ST12 in the first embodiment, so only different steps ST31 to ST33 and ST34 will be described.

[0097] First, in step ST31, the clamp device 388 inserted into the vertical hole 42 from the vertical hole opening 44 clamps the first flange (connection branch pipe side flange) 24 and the second flange (water supply pipe side flange) 26 that constitute the coupling device 16, and the coupling device 16 is fixed by the tightening body 3926. Next, in step ST32, the fastening device cutting device 116 inserted into the vertical hole 42 from the vertical hole opening 44 is locked to the second cutting jig locking portion 396. Next, in step ST33, the fastening device cutting device 116 inserted into the vertical hole 42 from the vertical hole opening 44 is operated from the vertical hole opening 44 side to cut the fastening device 36 (bolt 32) in the joint device 16, and then the fastening device cutting device 116 is removed from the vertical hole 42. Next, steps ST11 and ST12 are executed. Next, in step ST34, the clamp device 388 is removed from the coupling device 16. This makes it possible to remove the water supply pipe 10 from the connecting branch pipe. The subsequent steps are carried out in accordance with the steps described in the first embodiment.

[0098] Next, the second integrated refrigeration medium storage container 350 used in the third embodiment will be described with reference to Fig. 22. The second integrated refrigeration medium storage container 350 can be applied to embodiments other than the third embodiment, and the integrated refrigeration medium storage container 100 described in the first embodiment can be used in the third embodiment.

[0099] The second integrated refrigeration medium reserve container 350 is made up of second divided refrigeration medium reserve containers 352 (second first divided refrigeration medium reserve container 3521 to second n-th divided refrigeration medium reserve container 352n). First, the second divided refrigerating medium storage container 352 will be described with reference to Fig. 22. The same components as those in the divided refrigerating medium storage container 102 in the first embodiment will be assigned the same reference numerals and explanations thereof will be omitted, and only different configurations will be described. The second divided refrigeration medium reserve container 352 has the function of constituting the second integrated refrigeration medium reserve container 350, which constitutes the refrigeration medium reserve chamber 122 for reserving the refrigeration medium FM. The second integrated refrigeration medium reserve container 350 is composed of multiple second divided refrigeration medium reserve containers 352 (second first divided refrigeration medium reserve container 3521, second nth divided refrigeration medium reserve container 352n). By combining these multiple second divided refrigeration medium reserve containers 352, at least the container bottom wall 102b and the container side wall 102S form a pan shape, constituting the refrigeration medium reserve chamber 122 for reserving the refrigeration medium FM. In this embodiment 3, the second divided refrigeration medium reserve container 352 is composed of the second first divided refrigeration medium reserve container 3521 and the second second divided refrigeration medium reserve container 3522. However, the second integrated refrigeration medium reserve container 350 can be composed of a combination of three or more second divided refrigeration medium reserve containers 352n.

[0100] Next, the second first divided refrigerating medium storage container 3521 and the second second divided refrigerating medium storage container 3522 will be described. Since the second first divided refrigeration medium storage container 3521 and the second second divided refrigeration medium storage container 3522 have the same configuration, the second first divided refrigeration medium storage container 3521 will be explained as a representative, and for the second second divided refrigeration medium storage container 3522, the last digit of the same symbol will be changed from "1" to "2" and the explanation will be omitted. The second first divided refrigeration medium storage container 3521 is configured in the shape of a rectangular box made of a heat insulating material with an open top, divided in two in the longitudinal direction. However, the second divided refrigeration medium storage container 352 may be circular, elliptical, or any polygon other than a rectangle when viewed from above. As shown in FIG. 22(B), the second first container bottom wall 3541 of the second first divided refrigerant medium storage container 3521 is composed of a second lower bottom wall 3581 in which a semicircular second first recess 3561 constituting the second recess 356 is formed, and a second middle bottom wall 3601 disposed above the second lower bottom wall 3581. As shown in FIG. 22(B), the second lower bottom wall 3581 and the second middle bottom wall 3601 are connected by a second lower side wall 3621, and together with a second higher side wall 3641 rising upward from the end of the second middle bottom wall 3601, form the container side wall 102S. This configuration forms a recess 3661 below the second middle bottom wall 3601, which has the advantage of being usable even when an accessory is attached to the connecting branch pipe 14 and the rectangular divided refrigerant medium storage container 102 of the first embodiment cannot be used. A semicircular second first recess 3561 serving as recess 126 is formed in flat second lower bottom wall 3581. A second first side wall 3681, a second second side wall 3701, and a second third side wall 3721 are provided upward from the edge of second lower bottom wall 3581, each having a predetermined height H2. Second first recess 3561 is disposed between second first side wall 3681 and second lower side wall 3621. The outer dimensions of second first side wall 3681 and second lower side wall 3621 are configured to have a predetermined storage container width W02, and form second first held portion 3741 serving as second held portion 374. An increased height wall 376 having a predetermined height is fixed to the second first recess 3561, protruding toward the refrigerating medium storage chamber 122 side, and the second first recess 3561 has a thickness H3, which is thicker than the thickness of the second lower bottom wall 3581. This increases the adhesion area of ​​the sealant and prevents leakage of the refrigerating medium FM. The increased height wall 376 can be formed integrally with the second lower bottom wall 3581, but forming it separately has the advantage that the thickness H3 can be changed as needed by changing the height of the increased height wall 376. A second second recess 3562 is also formed in the second second divided refrigerating medium storage container 3522. In this embodiment 3, the end faces of the second first divided refrigeration medium storage container 3521 and the second second divided refrigeration medium storage container 3522 are butted together to form one second divided refrigeration medium storage container 352 and one refrigeration medium storage chamber 122. The second mark 3781 as the mark 136 of the second divided refrigerating medium storage container 352 is the upper edge 380 of the second divided refrigerating medium storage container 3521 and / or the second divided refrigerating medium storage container 3522. In other words, positioning is performed by abutting the upper edges 380 of the second divided refrigerating medium storage container 3521 and the second divided refrigerating medium storage container 3522 against the lower surface of the first flange (connection branch pipe flange) 24 constituting the coupling device 22. The depth D3 of the second integrated refrigerating medium storage container 350 is configured to be equal to or less than the diameter of the first flange 24. Therefore, the second divided refrigerating medium storage container 352 is suitable for use in a narrow vertical hole 42. Note that the upper edge 380 of the second divided refrigerating medium storage container 3521 or the second divided refrigerating medium storage container 3522 only needs to come into contact with the lower surface of the first flange (connection branch pipe flange) 24 to function as a mark (stopper).

[0101] Next, a second fastening device removal jig 382 that can also be used in Example 3 will be described with reference to Figure 23. Functional parts that are the same as those of the fastening device cutting jig 114 shown in Figure 12 will be given the same reference numerals and their explanations will be omitted, and different configurations will be described. In this third embodiment, the second fastening device removal jig 382 is composed of a holding frame 232, a first mounting device 384, a second mounting device 386, a clamping device 388, and a clamping device 394 with a cutting jig locking portion.

[0102] First, the holding frame 232 will be described. The retaining frame 232 is semicircular in shape, similar to the first retaining frame 2321 and the second retaining frame 2322 of Example 1, and is rotatable relative to the support shaft 238 as a support shaft, and is configured to be able to tighten the outer periphery of the coupling device 16 using the tightening device 244.

[0103] Next, the first mounting fixture 384 will be described. Similar to the first support portion 2341 of Example 1, the first attachment device 384 has a function of forming locking portions (eleventh locking hole 2821, twenty-first locking hole 2822, etc.) for locking the jig 278 for the fastening device cutting jig when the second fastening device removal jig 382 is attached to the coupling device 16. Note that the jig 278 for the fastening device cutting jig can lock the fastening device removal jig 113 and the second fastening device removal jig 382 in addition to the fastening device cutting jig 114. The first mounting fixture 384 has an eleventh support plate 2721 and a twelfth support plate 2741 that are provided in parallel and protrude at a predetermined distance in the radial direction from the first holding frame 2321. The eleventh support plate 2721 and the twelfth support plate 2741 are formed with an eleventh locking hole 2821 and a twelfth locking hole 2831 for locking the fastening device cutting jig 278.

[0104] Next, the second mounting fixture 386 will be described. The second mounting fixture 386 has a 21st support plate 2722 and a 22nd support plate 2742 that are provided in parallel and protrude at a predetermined distance in the radial direction from the second holding frame 2322. A 21st locking hole 2822 and a 22nd locking hole 2832 are formed in the 21st support plate 2722 and the 22nd support plate 2742, respectively. The second mounting fixture 386 is arranged symmetrically with the first mounting fixture 384.

[0105] Next, the clamp device 388 will be described. The clamp device 388 has a function of clamping the coupling device 16. Specifically, it has a function of tightening the first flange 24 and the second flange 26, with the packing 28 interposed therebetween, so that they approach each other. In other words, it has a function of fastening the coupling device 16 together with the fastening device 36 or in place of the fastening device 36. In this third embodiment, a clamp device 388 is used, including a first clamp device 3881 and a second clamp device 3882. Since both have the same structure, the first clamp device 3881 will be described below. As shown in FIG. 23(B), the first clamp device 3881 is composed of an eleventh arm 3921, a twelfth arm 3922 arranged parallel to the eleventh arm 3921 at a predetermined distance, a clamp body 3925 formed into a channel shape by a clamp connector 3924 connecting the eleventh arm 3921 and the twelfth arm 3922, and a fastening body 3926. In this third embodiment, the fastening body 3926 is a bolt. A receiving recess 3928 is formed between the eleventh arm 3921 and the twelfth arm 3922. In this third embodiment, the clamp device 388 is a so-called "C-type" clamp, but a conventional vise structure or the like can also be used. In this third embodiment, a first retaining frame 2321 is fixed to the side of the clamp connecting body 3924 of the first clamp device 3881 that faces the receiving recess 3928. The first clamp device 3881 receives the first flange 24 and the second flange 26 that constitute the coupling device 16 in the receiving recess 3928, screws the fastening body 3926 into the eleventh arm 3921 to press the second flange 26, and presses the first flange 24 against the twelfth arm 3922, thereby sandwiching and fastening the first flange 24 and the second flange 26 between the fastening body 3926 and the twelfth arm 3922. In other words, the first clamp device 3881 can fasten the coupling device 16 together with or instead of the fastening device 36.

[0106] Next, the clamp device 394 with a cutting jig locking portion will be described. The clamp device 394 with cutting jig locking portion has a function of clamping the joint device 16 and also of constituting a second cutting jig locking portion 396 . In the third embodiment, the clamp device 394 with cutting jig locking portion is formed by integrating a second cutting jig locking portion 396 with the clamp device 388 and fixed to the holding frame 232. Specifically, it is composed of a first clamp device 3941 with cutting jig locking portion fixed to the first holding frame 2321 and a second clamp device 3942 with cutting jig locking portion fixed to the second holding frame 2322. Since the first clamp device 3941 with cutting jig locking portion and the second clamp device 3942 with cutting jig locking portion have the same configuration, the second clamp device 3942 with cutting jig locking portion will be described as a representative. In the second clamp device 3942 with cutting jig locking portion, the same parts as those of the first clamp device 3881, which is the clamp device 388, are designated by the same reference numerals and description thereof will be omitted. In addition, in the first clamp device with cutting jig locking portion 3941, the same parts as those in the second clamp device with cutting jig locking portion 3942 have the suffix "2" changed to "1" and explanations thereof will be omitted.

[0107] Next, the second cutting tool locking portion 396 will be described. The second cutting jig locking portion 396 has a function of locking the fastening device cutting device 116, which is the fastening device removal device 115. In this Example 3, the second cutting jig locking portion 396 (22nd cutting jig locking portion 3962) includes the 22nd cutting jig locking portion 3962 integrated with the second clamp device 3882. The 21st cutting jig locking portion 3961 and the 22nd cutting jig locking portion 3962 have the same configuration, so the 22nd cutting jig locking portion 3962 will be described as a representative. The 22nd cutting jig locking portion 3962 is fixed to the clamp connecting body 3924 of the second clamp device 3882 by a plate-shaped connecting portion 398. The connecting portion 398 extends a predetermined length from the clamp connecting body 3924 in the radial direction of the first flange 24 and the second flange 26. A flat plate-shaped jig fixing body 402 is fixed at its middle portion to the tip of the connecting portion 398 so as to form a right angle. The jig fixing body 402 is a plate-shaped body extending in the circumferential direction of the first flange 24 and the second flange 26. A removal device support 404 is attached to an end of the jig fixing body 402. In this Example 3, the removal device support 404 is composed of a first support 4061 and a second support 4062 attached to both ends of the jig fixing body 402.

[0108] The first support 4061 and second support 4062, which are the second removal device support 4042, are round rod-shaped, with their lower ends fixed to the ends of the jig fixture 402 and their upper ends protruding upward from the upper surface of the jig fixture 402. This upward protruding portion is the removal device support part 408, i.e., the second removal device support part 4082, which is formed of a cylindrical body in this Example 3. For example, the cutting locking portion 306 of the fastening device cutting jig 114 described in the first embodiment can be fitted into the second removal device support portion 4082 for use.

[0109] Next, the operation of attaching the second fastening device removal jig 382 to the first flange 24 and the second flange 26 of the joint device 16 in the third embodiment will be described. First, outside the vertical hole opening 44, the first hook 3041 of the jig 2781 for the first fastening device cutting jig is engaged with the eleventh locking hole 2821 and the twelfth locking hole 2831, and the second hook 3042 of the jig 2782 for the second fastening device cutting jig is engaged with the twenty-first locking hole 2822 and the twenty-second locking hole 2832. Next, the second fastening device removal jig 382 is lifted by holding the first rod body 3021 and the second rod body 3022, and then inserted into the vertical hole 42 through the vertical hole opening 44, and lowered into the vertical hole 42 while maintaining a horizontal position. Next, with the clamp devices 388 (first clamp devices 3881 and second clamp devices 3882) positioned approximately midway between the four fastening devices 36, the jig 2781 for the first fastening device cutting jig and the jig 2782 for the second fastening device cutting jig are operated to rotate the support shaft 238 as a fulcrum in a direction in which the tips of the first holding frame 2321 and the second holding frame 2322 close. During this process, the peripheral edges of the first flange 24 and the second flange 26 are received in the receiving recess 3928. Additionally, the first fastening protrusion 2421 and the second fastening protrusion 2422 are brought closer to a predetermined distance. In this state, the first hook 3041 of the jig 2781 for the first fastening device cutting jig is removed from the 11th locking hole 2821 and the 12th locking hole 2831, and the second hook 3042 of the jig 2782 for the second fastening device cutting jig is removed from the 21st locking hole 2822 and the 22nd locking hole 2832. Next, using first fastening device cutting jig 2781 or second fastening device cutting jig 2782 , tightening bolt 256 is rotated around support shaft 254 , and tightening bolt 256 is inserted into receiving groove 248 . Next, the impact wrench 264 is inserted into the vertical hole 42 through the vertical hole opening 44 using the impact jig 266, the socket 268 is fitted into the clamping nut 262, and then the impact wrench 264 is driven to tighten the clamping nut 262, and the second fastening device removal jig 382 is attached to the coupling device 16 (the first flange 24 and the second flange 26).

[0110] Next, a fastening body rotation device that can engage with the fastening bodies 3926, such as the aforementioned nut jig 332, is inserted into the vertical hole 42 through the vertical hole opening 44 and engaged with the heads of the fastening bodies 3926 to tighten all of the fastening bodies 3926 and fasten the first flange 24 and the second flange 26. In this state, the load on the fastening devices 36 is reduced, reducing the risk of the fastening devices 36 being cut off. Furthermore, even if the fastening devices 36 are cut off, they are still fastened by the clamp device 388, preventing an accident from occurring. [Example]

[0111] Next, a fourth embodiment will be described with reference to FIGS. In Example 4, while in Example 3 the clamp device 388 (first clamp device 3881, second clamp device 3882) and the clamp device with cutting jig locking portion 394 (first clamp device with cutting jig locking portion 3941, second clamp device with cutting jig locking portion 3942) were fixed to the first holding frame 2321 or the second holding frame 2322, in Example 4 they are not fixed to the first holding frame 2321 and the second holding frame 2322 but are provided individually and independently.

[0112] 24(B) and 24(C), the clamp device 388 (first clamp device 3881, second clamp device 3882) has a configuration in which the first holding frame 2321 and the second holding frame 2322 are omitted from the clamp device 388 in Example 3. Therefore, the same parts as those in the clamp device 388 (first clamp device 3881, second clamp device 3882) are denoted by the same reference numerals, and descriptions thereof will be omitted.

[0113] Next, the second clamp device with cutting jig locking portion 412 (the 21st clamp device with cutting jig locking portion 4121, the 22nd clamp device with cutting jig locking portion 4122) will be described. The second clamp device 412 with cutting jig locking portion of Example 4 (21st clamp device with cutting jig locking portion 4121, 22nd clamp device with cutting jig locking portion 4122) is provided with individual clamp posture holders 414 (11th clamp posture holder 41411, 12th clamp posture holder 41412) instead of the first holding frame 2321 or the second holding frame 2322 in Example 3. The 21st clamp device with cutting jig locking portion 4121 and the 22nd clamp device with cutting jig locking portion 4122 have the same configuration, so the 21st clamp device with cutting jig locking portion 4121 will be described as a representative.

[0114] The 22nd clamp device with cutting jig locking portion 4122 will be described mainly with reference to Fig. 24. The 21st clamp device with cutting jig locking portion 4121 is different from the clamp device with cutting jig locking portion 394 of the third embodiment in that it is provided with a clamp posture holder 414 (first clamp posture holder 4141, second clamp posture holder 4142) and a backing plate 416 (first backing plate 4161, second backing plate 4162) for the 12th arm 3922.

[0115] First, the first clamping posture holder 4141 will be described. The first clamp attitude holder 4141 mainly functions to lock the fastening device cutting device 116 to the 21st cutting jig locking portion-equipped clamp device 4121, preventing the attitude of the coupling device 16 from changing due to the torque acting when cutting the fastening device 36. In this fourth embodiment, the first clamp attitude holder 4141 is composed of an eleventh clamp attitude holder 41411 and a twelfth clamp attitude holder 41412, which are arc-shaped, elongated plate pieces integrated with one end fixed to the left and right sides of the clamp connecting body 3924. The eleventh clamp attitude holder 41411 and the twelfth clamp attitude holder 41412 are formed in an arc shape so as to come into approximate surface contact with the circumferential surface of the first flange 24 or the second flange 26, or with both circumferential surfaces.

[0116] Next, the first backing plate 4161 will be described. The first backing plate 4161 is a flat plate fixed to the 11th arm 3921 side of the 12th arm 3922, and has the function of increasing the contact area with the first flange 24 and maintaining the posture of the 21st cutting tool locking portion equipped clamp device 4121. The first backing plate 4161 may not be provided if necessary. The 21st cutting tool locking portion equipped clamp device 4121 is attached to the coupling device 16 by a clamp device attachment jig 422 (FIG. 26).

[0117] Next, the clamp device mounting jig 422 will be described with reference to FIG. The clamp device mounting jig 422 has a function of mounting the clamp device 388 (first clamp device 3881, second clamp device 3882) or the second clamp device with cutting jig locking portion 412 (21st clamp device with cutting jig locking portion 4121, 22nd clamp device with cutting jig locking portion 4122) to the coupling device 16. In this Example 4, the clamp device mounting jig 422 includes a slender rod-shaped fourth support body 424, a placing portion 426, and a holding portion 428. The clamp device 388 (first clamp device 3881, second clamp device 3882) can also be mounted to the coupling device 16 by being clamped with a clamping tool.

[0118] First, the fourth support 424 will be described. The fourth support 424 has the function of inserting the placing portion 426 and the holding portion 428 into the vertical hole 42 through the vertical hole opening 44 and installing the second cutting tool locking portion-equipped clamp device 412 at a predetermined position, and in this embodiment 4 is a straight rod having a predetermined length, and preferably has a square cross section. The predetermined length is a length that can be operated from the vertical hole opening 44 side to perform a predetermined function. Operation from the vertical hole opening 44 side may be inside the vertical hole 42 or outside the vertical hole 42. In other embodiments, the term "predetermined length" of a support has a similar meaning.

[0119] Next, the placement section 426 will be described. The mounting portion 426 has at least the function of mounting the second cutting jig locking clamp device 412. In this Example 4, the mounting portion 426 is a flat plate-like body fixed to the lower end of the fourth support 424 so as to form an approximately right angle. The length of the mounting portion 426 is approximately the same as the length L (FIG. 24(C)) of the second cutting jig locking clamp device 412. A holding portion 428 is provided on the upper surface of the mounting portion 426.

[0120] Next, the holding portion 428 will be described. The holding portion 428 has the function of detachably holding the second cutting jig locking portion-equipped clamp device 412 in a substantially stationary state. In this Example 4, the holding portion 428 is composed of a pair of rectangular prism-shaped first and second holding bodies 4281 and 4282 fixed upward from the middle of the mounting portion 426. The first and second holding bodies 4281 and 4282 are arranged with a lateral holding gap 4283 between them in the width direction of the mounting portion 426. The lateral holding gap 4283 is a gap slightly wider than the thickness of the connecting portion 398 of the second cutting jig locking portion-equipped clamp device 412. The first and second holding bodies 4281 and 4282 are arranged with a rear holding gap 4284 between them and the fourth support 424. The rear holding gap 4284 is a gap slightly wider than the thickness of the jig fixing body 402.

[0121] Next, a method for attaching the second cutting jig engaging clamp device 412 to the coupling device 16 will be described. First, the clamp device 412 with the second cutting jig locking portion is attached to the clamp device attachment jig 422. The back surface of the jig fixing body 402 is aligned with the fourth support 424 of the clamp device attachment jig 422, and the jig fixing body 402 is opposed to the rear holding gap 4284. Next, the fourth support 424 is opposed to the lateral holding gap 4283 and lowered downward so that the lower surface of the twelfth arm 3922 is placed on the upper surface of the mounting portion 426. As a result, the clamp device 412 with the second cutting jig locking portion is substantially unable to move laterally (in the width direction of the mounting portion 426) or in the front-to-rear direction (in the longitudinal direction of the mounting portion 426) due to the holding portion 428 and the fourth support 424, and is essentially removably integrated with the clamp device attachment jig 422. Next, the clamp device mounting jig 422 equipped with the clamp device 412 with the second cutting jig locking portion is inserted into the vertical hole 42 through the vertical hole opening 44, and the receiving recess 3928 of the clamp device 412 with the second cutting jig locking portion is aligned with the peripheral portions of the first flange 24 and the second flange 26. Next, the clamp device mounting jig 422 is operated to move the second clamp device with cutting jig locking portion 412 parallel to the connecting branch pipe 14 and short pipe 18, and the first flange 24 and the second flange 26 are received in the receiving recess 3928. At this time, the first flange 24 and the second flange 26 are naturally positioned between the backing plate 416 on the twelfth arm 3922 and the lower end of the fastening body 3926. In addition, the clamp attitude maintaining body 414 is brought into close contact with the periphery of the first flange 24 and / or the second flange 26. The second clamp device with cutting jig locking portion 412 is preferably mounted so as to be located in the middle of the fastening device 36 and so that the 21st clamp device with cutting jig locking portion 4121 and the 22nd clamp device with cutting jig locking portion 4122 are point symmetrical. Next, the clamp device mounting jig 422 is moved downward. This causes the jig fixing body 402 to leave the rear holding gap 4284, and the connecting portion 398 to leave the side holding gap 4283. Thereafter, the clamp device mounting jig 422 is moved laterally to shift the mounting portion 426 to the side of the first flange 24, and then pulled up, thereby allowing the clamp device mounting jig 422 to be removed from the vertical hole opening 44. Next, the fastening body 3926 is rotated by engaging a bolt socket such as a nut jig 332 inserted through the vertical hole opening 44, and the tip of the fastening body 3926 is pressed against the second flange 26, and the first flange 24 and the second flange 26 are clamped and fixed by being sandwiched between the twelfth arm 3922 (backing plate 416) and the lower end of the fastening body 3926. The clamp device 388 (first clamp device 3881, second clamp device 3882) can be attached to the coupling device 22 by being grasped with a clamping tool having a pliers structure and inserted into the vertical hole 42 through the vertical hole opening 44. It is also preferable that the clamp device 388 is attached so that the first clamp device 3881 and the second clamp device 3882 are symmetrical. After this, the fastening device cutting device 116 as the fastening device removal device 115 is engaged with the first support 4061 or the second support 4062 of the 21st clamping device with cutting jig engaging portion 4121 and the 22nd clamping device with cutting jig engaging portion 4122, and the fastening device 36 can be removed in the same manner as described above. [Example]

[0122] Next, the second fastening device cutting device 432, which is the fastening device removal device 115, will be described with reference to FIG. The second fastening device cutting device 432 has a function that allows the position of the rotary blade 312 to be changed and can be easily adapted to different thicknesses of the second flange 26. Therefore, it can be used in place of the fastening device cutting device 116 described in the first embodiment. In this embodiment 5, the second fastening device cutting device 432 includes a fifth support 434, a first bearing 436, a second bearing 438, an intermediate bearing 442, a drive shaft 444, a position adjustment device 446, a position adjustment device fixing device 447, a rotary blade fixing device 448, and a rotary blade 312.

[0123] First, the fifth support 434 will be described. The fifth support 434 has the function of supporting the first bearing 436, the second bearing 438, the intermediate bearing 442, and the drive shaft 444. In this embodiment 5, the fifth support 434 is a straight rod with a square cross section and a predetermined length. A grip handle 452 is fixed to the upper end of the fifth support 434, protruding laterally.

[0124] Next, the first bearing 436 will be described. The first bearing 436 has a function of rotatably supporting the drive shaft 444 at a position closest to the rotary blade 312. In this fifth embodiment, the first bearing 436 is formed in the shape of a rectangular block having a predetermined fifth width W5, fifth height H5, and fifth length L5. The lower end of the fifth support 434 is inserted into an insertion hole 440 formed in the middle of the first bearing 436 and fixed with a press screw 454. The drive shaft 444 is fixed to, for example, an inner ring 456i of a ball bearing 456, and an outer ring 456o is fixed to the first bearing 436, so that the drive shaft 444 is supported so as to be rotatable relative to the first bearing 436 but immovable in the thrust direction. A fifth locking hole 450 serving as the cutting locking portion 306 that can fit into the removal device support portion 408 is formed on the opposite side of the drive shaft 444 across the fifth support member 434 of the first bearing 436. The axis of the fifth locking hole 450 and the axis of the drive shaft 444 are configured to be parallel to each other.

[0125] Next, the second bearing 438 will be described. The second bearing 438 has a function of supporting the upper end of the drive shaft 444 so that it can rotate freely. In the fifth embodiment, the second bearing 438 is fixed to the fifth support 434 and supports the drive shaft 444 via a bearing such as a ball bearing so that the drive shaft 444 is rotatable but cannot move in the thrust direction.

[0126] Next, the intermediate bearing 442 will be described. The intermediate bearing 442 has a function of rotatably supporting the drive shaft 444 between the first bearing 436 and the second bearing 438. In the fifth embodiment, the intermediate bearing 442 is partially fixed to the fifth support 434, and includes a first intermediate bearing 4421 and a second intermediate bearing 4422 that rotatably support the drive shaft 444 via a ball bearing or the like. However, one or more intermediate bearings 442 may be provided as needed.

[0127] Next, the drive shaft 444 will be described. The drive shaft 444 is driven and rotated by a drive device, for example, a rotation drive means 462, and has the function of rotating the rotary blade 312. In this fifth embodiment, the drive shaft 444 is a metal round bar having a predetermined length, and has a male thread portion 458 formed below the first bearing 436 for attaching the rotary blade 312, and a drive coupling portion 464 formed at the upper end for coupling to the rotation drive means 462. The male thread portion 458 has the function of fixing the rotary blade 312 to a predetermined position on the drive shaft 444 in cooperation with the position adjustment device 446, the position adjustment device fixing device 447, and the rotary blade fixing device 448. The drive coupling 464 is, for example, a hole with a regular hexagonal cross section, into which a regular hexagonal output shaft of an electric motor is fitted, and the rotation of the electric motor rotates the drive shaft 444 at high speed. However, the drive coupling 464 may have other configurations.

[0128] Next, the position adjusting device 446 will be described. The position adjustment device 446 has a function of changing the attachment position of the rotary blade 312 to the male thread portion 458 of the drive shaft 444. In this embodiment 5, the position adjustment device 446 is a cylindrical body fitted onto the male thread portion 458 of the drive shaft 444, in other words, a sleeve 466. The sleeve 466 has a predetermined length L51, and one end is fastened by a sleeve lock nut 468 serving as a position adjustment device fixing device 447 that is threaded onto the male thread portion 458 while being engaged with an end face of the inner ring 456i. After a spacer 472 having a predetermined thickness is interposed between the sleeve lock nut 468 and a first rotary blade protection plate 4741, the rotary blade 312 is attached, and a second rotary blade protection plate 4742 and a lock nut 480 are threaded onto the male thread portion 458, thereby firmly fixing the rotary blade 312 to the drive shaft 444. The rotary blade fixing device 448 is composed of a spacer 472 , a first rotary blade protection plate 4741 , a second rotary blade protection plate 4742 , and a lock nut 480 .

[0129] When the second fastening device cutting device 432 is used, the fifth locking hole 450 is fitted into the second removal device support portion 4081. This causes the lower surface 4361 of the first bearing 436 to abut against the upper surface of the jig fixture 402, thereby determining the vertical position of the second fastening device cutting device 432. In other words, the 52nd distance L52 between the rotary blade 312 and the first bearing 436 is determined. This 52nd distance L52 can be adjusted by changing the length of the sleeve 466, and therefore the length of the position adjustment device 446. Therefore, if the rotary blade 312 does not face the gap 30 between the first flange 24 and the second flange 26 due to differences in the thickness of the second flange 26, the rotary blade 312 can be positioned relative to the gap 30 by changing the length of the sleeve 466. [Example]

[0130] Next, a third fastening device cutting device 470 according to a sixth embodiment will be described with reference to FIG. The third fastening device cutting device 470 is an example of a fastening device cutting device that is durable and can utilize a larger diameter rotary blade 312. The use of a larger diameter rotary blade 312 has the advantage that the fastening device 36 can be cut even if the mounting position of the fastening device cutting jig 114 is significantly misaligned. The third fastening device cutting device 470 of the sixth embodiment includes a sixth support 474, a sixth bearing body 476, a sixth transmission shaft 478, a sixth gear train 482, a sixth drive shaft 484, a position adjustment device 486, a rotary blade fixing device 488, and a rotary blade 312.

[0131] First, the sixth support 474 will be described. The sixth support 474 supports the sixth bearing 476, the sixth transmission shaft 478, the sixth gear train 482, the sixth drive shaft 484, the position adjustment device 486, and the rotary blade fixing device 488, and functions to insert these into the vertical hole 40 and perform predetermined operations. In this sixth embodiment, the sixth support 474 is a cylindrical metal pipe having a predetermined length, and its lower end also serves as a sixth locking tube 492. Its sixth locking hole 496 is rotatably fitted into the removal device support 404, and a sixth support part 494 is fixed to the lower end in a horizontal orientation. By rotating the upper part of the sixth support 474, the sixth support part 494 can be rotated around the removal device support 404. Therefore, it is preferable to provide an operating handle or the like at the upper end of the sixth support 474.

[0132] The sixth support portion 494 is configured by a first support plate 4981 and a second support plate 4982, which have one end fixed to the sixth locking tube 492 and extend in parallel at a predetermined interval in the horizontal direction from the sixth locking tube 492, and a cylindrical collar 502 for maintaining the interval between the first support plate 4981 and the second support plate 4982, and by a spacing device 508 consisting of a first spacing device 5081, a second spacing device 5082, and a third spacing device 5083, each of which is made up of a bolt 504 and a nut 506. As a result, a gear train arrangement portion 512 is formed between the first support plate 4981 and the second support plate 4982.

[0133] Next, the sixth bearing body 476 will be described. The sixth bearing body 476 has a function of incorporating the sixth transmission shaft 478. In this sixth embodiment, the sixth bearing body 476 is a cylindrical body having a predetermined length, and its lower end is fixed to a position close to the sixth locking tube 492 of the first support plate 4981 that constitutes the sixth support body 474. In addition, it is preferable that the sixth bearing body 476 and the sixth support body 474 are connected at their intermediate portions by one or more stays.

[0134] Next, the sixth transmission shaft 478 will be described. The sixth transmission shaft 478 has the function of rotating the rotary blade 312 via a sixth gear train 482. In this sixth embodiment, the sixth transmission shaft 478 is disposed in a sixth bearing body 476 and is provided rotatably relative to a sixth support body 494. Although the upper end of the sixth transmission shaft 478 is not shown, a drive coupling portion 464 is provided thereon, similar to the fifth embodiment.

[0135] Next, the sixth gear train 482 will be described. The sixth gear train 482 has the function of mechanically transmitting the rotation of the sixth transmission shaft 478 to the sixth drive shaft 484. In this sixth embodiment, the sixth gear train 482 is fixed to the lower end of the sixth transmission shaft 478 and is composed of a first gear 4821 arranged in the gear train arrangement section 512 and a second gear 4822 fixed to the upper end of the sixth drive shaft 484 in the gear train arrangement section 512. The first gear 4821 and the second gear 4822 have the same diameter and the same number of teeth and are meshed with each other. Therefore, when the sixth transmission shaft 478 rotates, the sixth drive shaft 484 rotates in the opposite direction at the same rotation speed. The number of gears in the sixth gear train 482 can be three or more.

[0136] Next, the sixth drive shaft 484 will be described. The sixth drive shaft 484 has a function to which the rotary blade 312 is attached. In this sixth embodiment, the sixth drive shaft 484 is rotatably supported by a sixth support portion 494, has a second gear 4822 fixed to its upper end, and has a male thread portion 458 at its lower end that protrudes below the second support plate 4982. The axes of the sixth drive shaft 484 and the sixth transmission shaft 478 are arranged parallel to each other. The rotary blade 312 is attached to the male thread portion 458 of the sixth drive shaft 484 by a position adjustment device 486 and a rotary blade fixing device 488.

[0137] Next, the position adjustment device 486 will be described. The position adjustment device 486 has a function of adjusting the fixed position of the rotary blade 312 to the sixth drive shaft 484. However, the function of adjusting the position of the rotary blade 312 in the position adjustment device 486 is not essential, and it is sufficient if the position adjustment device 486 has at least the function of fixing the rotary blade 312 to the sixth drive shaft 484. In this Example 6, the position adjustment device 486 has substantially the same configuration as in Example 5, so the same functional parts are given the same reference numerals and their description will be omitted. However, the sleeve 466 is not used. Therefore, the sleeve lock nut 468 is screwed into a predetermined position on the male thread portion 458, and the spacer 472 and the first rotary blade protection plate 4741 are attached.

[0138] Next, the rotary blade fixing device 488 will be described. The rotary blade fixing device 488 has the function of fixing the rotary blade 312 to the sixth drive shaft 484 in cooperation with the position adjustment device 486. In this Example 6, the rotary blade fixing device 488 is composed of a second rotary blade protecting plate 4742 and a lock nut 480. The rotary blade 312 can be fixed by pressing the rotary blade 312 against the first rotary blade protecting plate 4741 to attach it, placing the second rotary blade protecting plate 4742 on the rotary blade 312, and screwing the lock nut 480 onto the male thread portion 458 and tightening it.

[0139] When using the third fastening device cutting device 470, the sixth support 474 is held and the rotary blade 312 is inserted into the vertical hole 42 through the vertical hole opening 44. Next, for example, the sixth locking hole 496 is fitted into the removal device support 404 and the removal device is mounted rotatably relative to the removal device support 404 . Next, the output shaft of the rotary drive means 462 is connected to the drive connection portion 464 of the sixth transmission shaft 478, and then the rotary drive means 462 is rotated to rotate the sixth transmission shaft 478. The rotation of the sixth transmission shaft 478 rotates the first gear 4821, which rotates the meshed second gear 4822 in the opposite direction. This rotates the sixth drive shaft 484, and the rotary blade 312 at the lower end rotates at a predetermined speed. Next, the sixth support 474 is operated to rotate the sixth support portion 494 around the removal device support 404, and the rotary blade 312 is pressed against the fastening device 36 to cut it. [Example]

[0140] Next, a fastening device mounting jig 522 for the fastening device 36 of the seventh embodiment will be described with reference to FIG. The fastening device mounting jig 522 has the function of attaching the bolt 32 and nut 34 as the fastening device 36 inserted through the vertical hole opening 44 to the coupling device 16. In this Example 7, the fastening device mounting jig 522 includes a seventh support 524, a bolt holding device 526, a nut holding device 528, a nut holder driving device 532, and a nut driving device 534.

[0141] First, the seventh support 524 will be described. The seventh support 524 supports the bolt holding device 526 and the nut holding device 528 and has the function of allowing them to be operated from the side of the vertical hole opening 44. In this embodiment 7, the seventh support 524 is a metal round bar having a predetermined length and diameter.

[0142] Next, the bolt holding device 526 will be described. The bolt holding device 526 has the function of holding the bolt 32 in a stationary position facing upward. In this seventh embodiment, the bolt holding device 526 includes a cylindrical fixed body 536 fixed to the lower end of the seventh support 524, a seventh arm 538 extending a predetermined length from the fixed body 536 in a direction laterally relative to the seventh support 524, and a bolt holder 542. The bolt holder 542 is a hexagonal socket fixed facing upward to the tip of the seventh arm 538, and has a hexagonal hole 544 formed on its upper surface into which the hexagonal head of the bolt 32 fits. The hexagonal portion of the head of the bolt 32 is inserted into the hexagonal hole 544, and the bolt 32 is held in an inverted position.

[0143] Next, the nut holding device 528 will be described. The nut holding device 528 has a function of holding the nut 34 with a predetermined force. In the seventh embodiment, the nut holding device 528 includes a slider 546 fitted to the middle part of the seventh support body 524 so as to be rotatable and slidable in the axial direction thereof, a clamping device 554 serving as the seventh holder 548 extending a predetermined length from the slider 546 in the lateral direction relative to the seventh support body 524, a nut holding arm 550, and a nut holder 552. The sliding body 546 is composed of a first disk body 5461 and a second disk body 5462 fitted to the seventh support body 524 so as to be able to slide freely. The clamping device 554 as the seventh holding body 548 has the function of holding the nut holding arm 550 in an adjustable position, and includes a flat first clamping plate 5541 that protrudes laterally from the first disc body 5461 by a predetermined length, and a second clamping plate 5542 that protrudes laterally from the second disc body 5462 by the same length as the first clamping plate 5541 and in the same direction, and supports the nut holding arm 550 parallel to the seventh arm 538. With the end of the nut holding arm 550 held between the first holding plate 5541 and the second holding plate 5542 , the tightening bolt 568 is tightened, and the nut holding arm 550 is provided approximately parallel to the seventh arm 538 . The nut holding arm 550 has a hollow flat plate shape and houses the nut holder driving device 532 therein. The nut holder 552 can rotate the nut 34 without causing relative rotation, and also has the function of holding the nut 34 with a predetermined force. In this embodiment 7, the nut holder 552 is a socket, which is a type of known tool, and is formed with a nut receiving hole 560. The predetermined force means that even when the nut 34 is held facing downward, the nut 34 does not fall off the nut holder 552, and when the nut holder 552 is moved in the removal direction with a force exceeding the predetermined force, the nut holder 552 can be removed from the nut 34. Furthermore, when nut holder 552 is positioned directly above bolt holder 542, the screw hole of nut 34 held by nut holder 552 faces the bolt of bolt 32 held by bolt holder 542, and their axes are set to be aligned on the same straight line. In other words, this setting condition is established by finely adjusting the clamping position of nut holding arm 550 by clamping device 554.

[0144] Next, the nut holder driving device 532 will be described. The nut holder drive device 532 receives a driving force from the nut drive device 534 and functions to rotate the nut holder 552 about its axis. In this seventh embodiment, the nut holder drive device 532 is composed of a drive gear 556 that is rotationally driven by the nut drive device 534, a driven gear 558 integrated with the upper end of the nut holder 552, and an idle gear 562 that meshes with the drive gear 556 and the driven gear 558. The drive gear 556, the driven gear 558, and the idle gear 562 are configured with the same diameter and the same number of teeth, so the drive gear 556 and the driven gear 558 rotate in the same direction and at the same rotation speed. A hexagonal drive hole 564 is formed in the axial portion of the drive gear 556. With this configuration, when the drive gear 556 is rotated, for example, counterclockwise, the idle gear 562 is rotated clockwise, and the driven gear 558, and therefore the nut holder 552, rotates counterclockwise at the same speed.

[0145] Next, the nut driving device 534 will be described. The nut driving device 534 has a function of driving the nut holder driving device 532. Specifically, it has a function of rotating the driving gear 556 in a predetermined direction from the side of the vertical hole opening 44. In this Example 7, the nut driving device 534 is a round bar body, the lower end of which is formed into a hexagonal bar wrench part 566, and the upper end of which is attached with a handle for manual rotation or a structure for connecting to a rotation driving device. Therefore, after inserting hexagonal wrench portion 566 of nut driver 534 into drive hole 564, nut driver 534 can be rotated in a predetermined direction to rotate nut holder 552 in the predetermined direction via nut holder drive device 532. Nut holder 552 preferably has a through hole 570 around its axis so that the tip of bolt 32 can be positioned therein.

[0146] Next, a method for attaching the bolts 32 and nuts 34 using the fastening device mounting jig 522 will be described. First, outside the vertical hole 42, the head of the bolt 32 is fitted into the hexagonal hole 544 of the bolt holder 542, and the bolt 32 is attached in an upside-down position. Next, the nut 34 is fitted into the nut receiving hole 560 of the nut holder 552 and attached. The bolt 32 and nut 34 may be attached in the reverse order. Next, the hexagonal wrench portion 566 at the tip of the nut driver 534 is inserted into the drive hole 564 so that the nut holder 552 is rotated by the rotation of the nut driver 534 . Next, the seventh support 524 is operated to insert the bolt 32 and nut 34 into the vertical hole 42 through the vertical hole opening 44. During this insertion, as shown in Figure 30(B), it is preferable to shift the bolt holding device 526 and the nut holding device 528 so that the bolt holding device 526 and the nut holding device 528 do not overlap when viewed from the vertical hole opening 44 side. Note that this overlapping can be eliminated by operating the nut driving device 534 after insertion into the vertical hole 42. Next, the seventh support 524 is operated to position the tip of the bolt 32 below the first through hole 24H of the first flange 24, and then the seventh support 524 is moved upward, causing the bolt 32 to pass through the first through hole 24H and the second through hole 26H, and causing the tip of the bolt 32 to protrude above the second flange 26. Next, the nut driving device 534 is operated to rotate the nut holding device 528 around the seventh support 524, and the position of the nut 34 is adjusted so that the screw hole of the nut 34 faces the bolt 32. Next, the nut driving device 534 is operated to slide the nut holding device 528 downward relative to the seventh support body 524 , and the screw hole of the nut 34 is brought into contact with the tip of the bolt 32 . Next, the nut driving device 534 is rotated about its axis to rotate the driving gear 556, which in turn rotates the driven gear 558 via the idle gear 562, and therefore the nut holder 552, thereby threading the nut 34 onto the bolt 32 and tightening it. Next, the seventh support 524 is operated to move the nut holding device 528 upward, and the nut holder 552 is released from the nut 34. Next, the seventh support 524 is operated to move the bolt holding device 526 downward, and the bolt holder 542 is released from the bolt 32 . Next, the seventh support 524 is operated to move it away from the first flange 24 and the second flange 26, and then pulled up and removed from the vertical hole opening 44. This operation is repeated for the number of fastening devices 36 to complete the installation of the fastening devices 36. [Example]

[0147] Next, a fastening device removal device 572, which is the fastening device removal device 115 of the eighth embodiment, will be described with reference to FIG. The fastener removal device 572 has the function of breaking the nut 34, thereby enabling the fastener 36 to be removed from the coupling device 16. In this eighth embodiment, the fastener removal device 572 includes a nut cutter support 574, a nut cutter 576, and a cutter drive device 578. Note that the fastener removal device 572 may also be, for example, a cutting device that cuts the nut 34 and the bolt 32 above the second flange 26.

[0148] First, the nut cutter support 574 will be described. The nut cutter support 574 has the function of supporting the nut cutter 576 and moving it from the vertical hole opening 44 into the vertical hole 42 to engage with the nut 34 that constitutes the fastening device 36. In this Example 8, the nut cutter support 574 is an elongated metal rod having a predetermined length, and a grip handle 580 is fixed to the upper end thereof and is oriented laterally relative to the nut cutter support 574. The nut cutter 576 is fixed to the lower end of the nut cutter support 574 by a clasping method or the like.

[0149] Next, the nut cutter 576 will be described. The nut cutter 576 has a function of breaking the nut 34 of the fastening device 36. In this embodiment 8, the nut cutter 576 is a known nut cutter. The nut cutter 576 includes a cutter body 582, a cutting blade 584, a pushing device 586, and an eighth driven part 588. First, the cutter body 582 will be described. The cutter body 582 has the function of directly supporting the cutting blade 584 and the pushing device 586, and in this embodiment 8 has a ring-shaped cutting blade holding portion 594 with a nut receiving hole 592, and a body portion 596 with the pushing device 586 provided therein. Next, the cutting blade 584 will be described. The cutting blade 584 has the function of clamping the nut 34 from diagonal directions to break the nut 34. In this Example 8, the cutting blade 584 is composed of a fixed cutting blade 5841 provided on the cutting blade holder 594 and a push-movable cutting blade 5842 provided on the main body 596 side. The fixed cutting blade 5841 is formed in a triangular shape and is held in the first holding hole 598 so that its ridge line contacts the nut 34. The push-movable cutting blade 5842 has a triangular tip and is held in the second holding hole 602 on the main body 596 so as to be movable toward and away from the fixed cutting blade 5841. The push-movable cutting blade 5842 is pushed by the pushing device 586 so as to approach the fixed cutting blade 5841. Next, the pushing device 586 will be described. The pushing device 586 has a function of pushing the pushing cutter blade 5842 so as to approach the fixed cutter blade 5841. In the eighth embodiment, the pushing device 586 is composed of a pushing unit 604, a ratchet unit 606, and a driven shaft 608. The pushing unit 604 is, for example, a screw used in a vice. The ratchet unit 606 has a function of converting the reciprocating rotation of the driven shaft 608 into rotation in one direction and transmitting it to the pushing unit 604. The driven shaft 608 is rotatably supported by the main body 596 and rotated by the cutter driving device 578. In the eighth embodiment, the driven shaft 608 is rotated reciprocally by the cutter driving device 578. In the eighth embodiment, the fixed cutter blade 5841, the pushing cutter blade 5842, and the pushing device 586 have their centers arranged on the same center line CL.

[0150] Next, the cutter driving device 578 will be described. The cutter driving device 578 has a function of reciprocatingly rotating the driven shaft 608. In the eighth embodiment, the cutter driving device 578 includes a fitting portion 612, a swinging portion 614, a driving swing portion 616, and a connecting body 618. First, the fitting portion 612 will be described. The fitting portion 612 has a function of being fitted onto the driven shaft 608 so as to be non-rotatable relative to the driven shaft 608. In other words, the fitting portion 612 has a hole formed therein into which the driven shaft 608 can be fitted. Next, the vibrating portion 614 will be described. The swingable portion 614 has a function of rotating the fitting portion 612 back and forth. In this embodiment 8, the swingable portion 614 is composed of a first lever 6141 and a second lever 6142 extending horizontally from the fitting portion 612 to the left and right. Next, the driving swinging portion 616 will be described. The driving swinging part 616 has the function of swinging the swingable part 614, and in this Example 8, the driving swinging part 616 is a swinging lever 624 swingably attached to a support shaft 622 at the upper end of the nut cutter support body 574. The left and right tip ends of the swinging lever 624 are attached to the tip end of a first lever 6141 or a second lever 6142 by a first connecting rod 6181 and a second connecting rod 6182, which serve as a connecting body 618, respectively. With this configuration, by swinging the swing lever 624, the first lever 6141 and the second lever 6142 are swung via the first connecting rod 6181 and the second connecting rod 6182. The swinging motion of the first lever 6141 and the second lever 6142, and therefore the swingable part 614, causes the driven shaft 608 to rotate back and forth. The reciprocating rotation of the driven shaft 608 is converted into rotation in one direction by the ratchet part 606, causing the pushing part 604 to rotate in one direction. This rotation causes the pushing part 604 to move the pushing cutter blade 5842 toward the fixed cutter blade 5841.

[0151] A method for removing fasteners 36 using fastener removal tool 572 will now be described. Holding the nut cutter support 574, the nut cutter 576 is inserted into the vertical hole 42 through the vertical hole opening 44. Next, the nut cutter support 574 is operated to fit the nut 34 into the nut receiving hole 592 of the nut cutter 576 . Next, the swing lever 624 is swung, causing the first lever 6141 and the second lever 6142 to swing via the first connecting rod 6181 and the second connecting rod 6182, causing the driven shaft 608 to rotate back and forth, moving the pushing portion 604 via the ratchet portion 606, and moving the pushing cutter blade 5842 toward the fixed cutter blade 5841. As a result, the fixed cutter blade 5841 and the pushing cutter blade 5842 clamp the nut 34 with great force, thereby breaking it. After the nut 34 is broken, the nut cutter support 574 is operated to remove the nut cutter 576 from the vertical hole opening 44 . Thereafter, the bolt 32 and nut 34 can be removed from the coupling device 16 using a magic hand or the like. In this case, the swing lever 624 can be disposed either outside the vertical hole opening 44 or inside the vertical hole 42. Therefore, driving from the vertical hole opening 44 side means driving from either inside or outside the vertical hole 42. [Example]

[0152] Next, a second fastening device remover 626 according to a ninth embodiment will be described with reference to FIGS. The second fastening device removal device 626 is made up of a hydraulic nut cutter 628 and a ninth support 632. The same parts as those in the fastening device removal device 572 of the eighth embodiment are given the same reference numerals and their explanations will be omitted, and only different configurations will be explained. In the ninth embodiment, the hydraulic nut cutter 628 has a main body 596 fixed to the lower end of a ninth support 632 . The ninth support 632 is a rod-like body having a predetermined length. The hydraulic nut cutter 628 is composed of a cutting blade holder 594, a cutting blade 584, and a hydraulic cylinder device 634. The pushing cutting blade 5842 is pushed by the hydraulic cylinder device 634. The hydraulic cylinder device 634 is composed of a hydraulic cylinder 636 formed in the main body 596 and a piston 638 slidably housed within the hydraulic cylinder 636, and the pushing portion 604 is pushed by the piston 638. The hydraulic cylinder 636 is connected to a hydraulic pump 642 via a hydraulic hose 644. The hydraulic pump 642 may be manual or electric. The hydraulic pump 642 is the cutter drive device 578.

[0153] A method for removing the nut 34 using the second fastening device removal device 626 of the ninth embodiment will be described with reference to FIG. The ninth support 632 is operated to insert the hydraulic nut cutter 628 into the vertical hole 42 through the vertical hole opening 44 . Next, the ninth support 632 is operated to fit the nut 34 into the nut receiving hole 592 of the hydraulic nut cutter 628 . Next, hydraulic pump 642 is operated to send pressurized oil to hydraulic cylinder 636 via hydraulic hose 644, and piston 638 is pushed toward fixed cutter blade 5841. As a result, pushing portion 604 pushes pushing cutter blade 5842 toward fixed cutter blade 5841, and breaks nut 34. The subsequent operations are the same as in Example 8. [Example]

[0154] Next, a second clamp device 652 according to a tenth embodiment will be described with reference to Figures 34 and 35. The second clamp device 652 is a modified example of the clamp device 388 described above, and is an example that is easier to attach to the coupling device 16 than the clamp device 388. The second clamping device 652 includes a first clamping body 654 , a second clamping body 656 , a connecting device 658 , and a tenth fastening device 662 .

[0155] First, the first clamping member 654 will be described. The first clamping body 654 has the function of clamping the coupling device 16 together with the second clamping body 656. In this embodiment 10, the first clamping body 654 has a flat plate shape with a predetermined width, length, and thickness. A tenth through hole 664 for a tenth tightening device 662 is formed in the middle of the first clamping body 654.

[0156] Next, the second clamping body 656 will be described. The second clamping body 656 has the function of clamping the coupling device 16 together with the first clamping body 654. In this embodiment 10, the second clamping body 656 has a flat plate shape with a predetermined width, length, and thickness. An eleventh through-hole 666 for a tenth tightening device 662 is formed in the middle of the second clamping body 656. In addition, a rotation prevention device 672 that prevents rotation of a tenth nut 668 that constitutes the tenth tightening device 662 is provided on the surface opposite to the first clamping body 654. The rotation preventing device 672 is made up of a first preventing plate 6721 and a second preventing plate 6722 that are provided at a tenth interval W10 whose inside dimension is slightly larger than the width across flats of the tenth nut 668.

[0157] Next, the coupling device 658 will be described. The connecting device 658 has a function of supporting the first clamping body 654 and the second clamping body 656 so that they can move relative to each other. In the tenth embodiment, the connecting device 658 is a rotary connecting device 674, and is composed of a first bearing plate 6741 protruding downward from an end of the first clamping body 654, a second bearing plate 6742 and a third bearing plate 6743 protruding upward in parallel at a predetermined interval from an end of the second clamping body 656, and a tenth support shaft 676 passing through them. The lower end of the first bearing plate 6741 is sandwiched between the second bearing plate 6742 and the third bearing plate 6743. The tenth support shaft 676 is preferably integrated by screwing a pair of hexagon socket head bolts together so that their cylindrical first head 6761 and second head 6762 are positioned within the width of the first clamping body 654 and the second clamping body 656. Therefore, first clamping body 654 and second clamping body 656 can rotate about tenth support shaft 676 as a fulcrum, and first clamping portion 6541 and second clamping portion 6561 at the tip ends of first clamping body 654 and second clamping body 656 can be moved toward and away from each other. Furthermore, it is preferable to determine the dimensions of first bearing plate 6741, second bearing plate 6742, third bearing plate 6743, and tenth support shaft 676 so that when first clamping body 654 and second clamping body 656 clamp first flange 24 and second flange 26 that constitute coupling device 16, they are substantially parallel to each other. The connecting device 658 can be replaced with another device having a similar function. For example, the first clamping body 654 and the second clamping body 656 can be configured to move toward and away from each other by translation.

[0158] Next, the tenth tightening device 662 will be described. The tenth tightening device 662 has the function of bringing the first clamping body 654 and the second clamping body 656 relatively close to each other, clamping the first flange 24 and the second flange 26 that constitute the coupling device 16 between the first clamping portion 6541 and the second clamping portion 6561, and fastening those flanges. In the tenth embodiment, the tenth tightening device 662 includes a tenth tightening bolt 678, a tenth nut 668, and a biasing body 680. The tenth tightening bolt 678 passes through the tenth through-hole 664 of the first clamping body 654 and the eleventh through-hole 666 of the second clamping body 656, and its tip is threaded into the tenth nut 668. By threading the tenth tightening bolt 678 into the tenth nut 668, the first clamping body 654 and the second clamping body 656 are brought closer together, making it possible to clamp the first flange 24 and the second flange 26. The tenth nut 668 is non-rotatable because its width across flats is disposed between the first blocking plate 6721 and the second blocking plate 6722. Therefore, by tightening the tenth tightening bolt 678, the first clamping body 654 and the second clamping body 656 are brought closer together. The tenth nut 668 can be made non-rotatable by being integrated with the second clamping body 656. The biasing member 680 has the function of biasing the first clamping member 654 and the second clamping member 656 in a direction that separates them. In the tenth embodiment, the biasing member 680 is a coil spring 682 attached to the tenth tightening bolt 678. However, the biasing member 680 can be attached in parallel to the tenth tightening bolt 678 without being attached to the tenth tightening bolt 678. Alternatively, the biasing member 680 can be replaced by an elastic material such as rubber. Note that the biasing member 680 is not an essential component. If the first clamping member 654 and the second clamping member 656 are held at a distance greater than the thickness of the first flange 24 and the second flange 26, and the first clamping member 654 and the second clamping member 656 can approach each other when the tenth tightening bolt 678 is tightened, the biasing member 680 is not necessary.

[0159] Next, a second clamp installation jig 684 as an installation jig for the second clamp device 652 will be described with reference to FIG. The second clamp installation jig 684 has the function of a jig used when installing the second clamp device 652 to the coupling device 16. The second clamp installation jig 684 in this embodiment 10 includes a tenth support body 685 and a tenth holding device 686.

[0160] Next, the tenth support 685 will be described. The tenth support 685 has a function of holding the tenth holding device 686. In this tenth embodiment, the tenth support 685 is a linear rod having a rectangular cross section and a predetermined length.

[0161] Next, the tenth holding device 686 will be described. The tenth holding device 686 cooperates with the tenth support body 685 to hold the second clamp device 652. In this embodiment 10, the tenth holding device 686 is composed of a pair of L-shaped eleventh and twelfth holding plates 6881 and 6882 that are arranged in parallel at a predetermined distance apart that is slightly larger than the width of the second clamping portion 6561, and is fixed to the lower end of the tenth support body 685. As a result, the tenth support body 685 and the tenth holding device 686 form an upward-facing tenth recess 692. The tenth recess 692 includes an eleventh holding recess 6921 formed by the eleventh holding plate 6881 and a twelfth holding recess 6922 formed by the twelfth holding plate 6882. The eleventh holding recess 6921 is composed of a rear wall 6931 which is one side wall of the tenth support body 685 , and an eleventh lower wall 6942 and an eleventh front wall 6943 of the eleventh holding plate 6881 . The twelfth holding recess 6922 is composed of a back wall 6931 which is one side wall of the tenth support body 685 , a second lower wall 6962 of the twelfth holding plate 6882 , and a twelfth front wall 6963 . The first head 6761 of the tenth support shaft 676 can be positioned in the eleventh holding recess 6921 , and the second head 6762 of the tenth support shaft 676 can be positioned in the twelfth holding recess 6922 . The space between the lower ends of the eleventh holding plate 6881 and the twelfth holding plate 6882 is closed by a bottom plate 690 .

[0162] Next, a method for mounting the second clamp device 652 to the coupling device 16 will be described with reference to FIG. First, in step ST41, preparation is made for mounting the second clamping device 652. Specifically, the tenth tightening bolt 678 is loosened to bring the first clamping portion 6541 and the second clamping portion 6561 into a state in which they are spaced apart from the parallel state, that is, into a flared state (the state of FIG. 34(B)). Next, in step ST42, the second clamping device 652 is attached to the tenth holding device 686. Specifically, the rear ends of the first clamping body 654 and the second clamping body 656 of the second clamping device 652 are moved along the back wall 6931 of the tenth support body 685 toward the tenth recessed portion 692. During this movement, the second clamping body 656 is positioned between the eleventh holding plate 6881 and the twelfth holding plate 6882. When it is further moved toward the tenth recess 692, the first head 6761 is positioned in the eleventh holding recess 6921, the second head 6762 is positioned in the twelfth holding recess 6922, and the lower surface of the second clamping body 656 is placed on the bottom plate 690. As a result, the bottom plate 690 prevents the second clamping device 652 from moving downward. Furthermore, even if the second clamping device 652 tries to tip left or right, it is prevented by the eleventh holding plate 6881 or the twelfth holding plate 6882. Furthermore, even if the second clamping device 652 attempts to move toward the tip of the first clamping body 654 and the second clamping body 656, the first head 6761 and the second head 6762 are blocked by the eleventh front wall 6943 or the twelfth front wall 6963, and therefore the second clamping device 652 is held stationary by the tenth holding device 686. Next, in step ST43, the tenth support body 685 is operated to insert the second clamp device 652 into the vertical hole 42 through the vertical hole opening 44, and the first flange 24 and the second flange 26, which are the coupling device 16, are moved to a position where they are clamped by the first clamping portion 6541 of the first clamping body 654 and the second clamping portion 6561 of the second clamping body 656 (Figure 35(D)1). Next, the tenth support body 685 is operated to move the second clamping device 652 straight to the side, and the first clamping portion 6541 is moved to be positioned above the second flange 26 and the second clamping portion 6561 is moved to be positioned below the first flange 24, so that the side of the tenth tightening bolt 678 (coil spring 682) abuts against the peripheral surfaces of the first flange 24 and the second flange 26. Next, in step ST44, the tenth tightening bolt 678 is rotated in the tightening direction using, for example, the nut jig 332, thereby tightening and fixing the first flange 24 and the second flange 26 together. Next, the tenth support body 685 is operated to move the tenth holding device 686 downward, and after the head portion 676 is released from the tenth recess portion 692, the tenth support body 685 is extracted from the vertical hole opening 44. This operation is repeated for the number of second clamp devices 652 to be installed. For example, as shown in the example of Fig. 25, four second clamp devices 652 are installed. As a result, the first flange 24 and the second flange 26 are firmly fastened by the four second clamp devices 652, which reduces the load on the existing fastening devices 36 and prevents them from being accidentally cut off. Next, the above-described steps ST11 to ST14 are carried out to freeze the water in the connecting branch pipe 14, and then the existing fastening device 36 is removed, making it possible to remove the short pipe 18. Next, in step ST45, the tenth fastening bolt 678 is loosened using the nut jig 332 or the like, and then the second clamp device 652 is removed using a magic hand or the like. Next, the short pipe 18 is replaced and fastened with a new fastening device 36, that is, the bolt 32 and nut 34. The second clamp device 652 of the tenth embodiment can also be used when replacing the short pipe 18 with a new bolt 32 and nut 34 without replacing it. Replacement of the bolts 32 and nuts 34 can be accomplished using the fastener removal tool 572 previously described.

[0163] The present invention is not limited to the examples, and various modifications can be made within the scope of the present invention. [Explanation of symbols]

[0164] 10 Water supply pipe 12 Water main 14 Connecting branch pipe 16 Coupling device 24 Water supply pipe flange 26 Connection branch pipe flange 31 Flange joint device 36 Fastening device 42 Vertical Hole 44 Vertical hole opening 100 Integrated freezing medium holding container 102 Divided freezing medium holding container 1021 1st division freezing medium holding container 1022 2nd division freezing medium holding container 104 Container jig 106 Refrigeration medium holding container device 108 Refrigerating medium feed pipe 112 Holding container cutting device 114 Fastening device cutting jig 116 Fastening device cutting device 126 Recess 136 Landmark 138 Stopper 144 Container holding device 1441 First container holding device 1442 Second container holding device 1521 Holding container bottom wall 1541, 1561, 1581 side wall 224 Electric heater 236 Cutting jig locking part 232 Retaining frame 306 Cutting and locking part 308 Arm 312 Rotary blade 322 Cutting device jig 328 Bolt Jig 332 Nut Jig 334 Fastening device jig 3521 1st division freezing medium holding container 3522 2nd division freezing medium holding container 3541 Bottom wall 3561 First recess 3562 Second recess 380 upper edge 388, 394, 412, 652 Clamping devices 396 Cutting jig locking part 414 Clamp position holder 432 Fastening device cutting device 436 Bearings 444 Drive shaft 458 Male thread 466 Sleeve 468 Sleeve Lock Nut 462 Rotary drive unit 464 Drive connection part 480 Lock nut 524 Support 534 Nut driver 556 Drive Gear 558 Driven Gear 574 Support 576, 628 Nut cutter 578 Cutter drive unit 642 Hydraulic Pump FM refrigeration medium

Claims

1. A method for removing a fastening device (36) from a water supply pipe installation structure in which a connecting branch pipe (14) branching off from a water supply main pipe (12) and a downstream water supply pipe (10) are connected by a flange coupling device (31) in which a coupling device (16) including a connecting branch pipe flange (26) and a water supply pipe flange (24) adjacent to the connecting branch pipe flange (26) on the water supply pipe (10) side is fixed by a fastening device (36), thereby detachably connecting the water supply pipe (10), and the connecting branch pipe (14), the coupling device (16), and the water supply pipe (10) are arranged in an existing vertical hole (42) having a vertical hole opening (44), comprising: a step of inserting a clamp device (652) including a first clamping body (654), a second clamping body (656) and a tightening device (662) arranged vertically to hold the connecting branch pipe side flange (26) and the water supply pipe side flange (24) close to each other into the vertical hole (42) through the vertical hole opening (44) while the clamp device (652) is held by a clamp installation jig (684); a step of temporarily installing the clamp device (652) by using the clamp installation jig (684) so ​​as to sandwich the water supply pipe side flange (24) and the connecting branch pipe side flange (26); a step of fixing the temporarily installed clamp device (652) to the flange joint device (31) by operating the fastening device (662) using a fastener (678) inserted into the vertical hole (42) through the vertical hole opening (44); a step of inserting the one clamp device (652) into the vertical hole (42), a step of temporarily installing the one clamp device (652), and a step of fixing the one clamp device (652) are repeated a predetermined number of times; removing the fastener (36) by inserting a fastener removal device (115) into the vertical hole (42) through the vertical hole opening (44); A fastening device removal method comprising:

2. A method for removing a fastening device (36) from a water supply pipe installation structure in which a connecting branch pipe (14) branching off from a water supply main pipe (12) and a downstream water supply pipe (10) are connected by a flange coupling device (31) in which a coupling device (16) including a connecting branch pipe flange (26) and a water supply pipe flange (24) adjacent to the connecting branch pipe flange (26) on the water supply pipe (10) side is fixed by a fastening device (36), thereby detachably connecting the water supply pipe (10), and the connecting branch pipe (14), the coupling device (16), and the water supply pipe (10) are arranged in an existing vertical hole (42) having a vertical hole opening (44), comprising: a step of inserting a clamp device (652) including a first clamping body (654), a second clamping body (656) and a tightening device (662) arranged vertically to hold the connecting branch pipe side flange (26) and the water supply pipe side flange (24) close to each other into the vertical hole (42) through the vertical hole opening (44) while the clamp device (652) is held by a clamp installation jig (684); a step of temporarily installing the clamp device (652) by using the clamp installation jig (684) so ​​as to sandwich the water supply pipe side flange (24) and the connecting branch pipe side flange (26); a step of fixing the temporarily installed clamp device (652) to the flange joint device (31) by operating the fastening device (662) using a fastener (678) inserted into the vertical hole (42) through the vertical hole opening (44); a step of repeating a step of inserting the one clamp device (388) into the vertical hole (42), a step of temporarily installing the one clamp device (388), and a step of fixing the one clamp device (388) a predetermined number of times; a step of supplying a refrigeration medium (FM) into the integrated refrigeration medium storage container (100) and freezing at least the water in the connecting branch pipe (14); a step of allowing the fastener (36) to be removed by a fastener removal device (115) inserted into the vertical hole (42) through the vertical hole opening (44), thereby allowing the water supply pipe (10) to be removed; How to replace a water supply pipe, including:

3. A method for replacing a water supply pipe (10) in a water supply pipe installation structure in which a connecting branch pipe (14) branching off from a water supply main pipe (12) and a downstream water supply pipe (10) are connected by a flange coupling device (31) in which a coupling device (16) including a connecting branch pipe flange (26) and a water supply pipe flange (24) adjacent to the connecting branch pipe flange (26) on the water supply pipe (10) side is fixed by a fastening device (36), thereby allowing the water supply pipe (10) to be detachably connected, and the connecting branch pipe (14), the coupling device (16), and the water supply pipe (10) are arranged in an existing vertical hole (42) having a vertical hole opening (44), comprising: a step of inserting a clamp device (652) including a first clamping body (654), a second clamping body (656) and a tightening device (662) arranged vertically to hold the connecting branch pipe side flange (26) and the water supply pipe side flange (24) close to each other into the vertical hole (42) through the vertical hole opening (44) while the clamp device (652) is held by a clamp installation jig (684); a step of temporarily installing the clamp device (652) by using the clamp installation jig (684) so ​​as to sandwich the water supply pipe side flange (24) and the connecting branch pipe side flange (26); a step of fixing the temporarily installed clamp device (652) to the flange joint device (31) by operating the fastening device (662) using a fastener (678) inserted into the vertical hole (42) through the vertical hole opening (44); a step of inserting the one clamp device (652) into the vertical hole (42), a step of temporarily installing the one clamp device (652), and a step of fixing the one clamp device (652) are repeated a predetermined number of times; a step of inserting a container jig (104) holding divided refrigeration medium storage containers (102) into the vertical hole (42) through the vertical hole opening (44) and surrounding at least a portion of the connecting branch pipe (14) with the divided refrigeration medium storage containers (102); a positioning step of abutting a stopper (138) provided on the divided refrigeration medium storage container (102) against the coupling device (16); a step of constructing an integral refrigeration medium storage container (100) using a plurality of the divided refrigeration medium storage containers (102); a step of supplying a refrigerating medium (FM) into the integrated refrigerating medium storage container (100) and freezing at least the water in the connecting branch pipe (14); a step of cutting the fastener (36) of the flange joint device (31) by a fastener cutting device (116) inserted into the vertical hole (42) through the vertical hole opening (44), thereby making the water supply pipe (10) removable; removing the water supply pipe (10) from the well opening (44); a step of inserting a new water supply pipe (10) into the vertical hole (42) through the vertical hole opening (44) and aligning it with the connecting branch pipe (14); a step of inserting a new fastening device (36) into the vertical hole (42) through the vertical hole opening (44) to fasten the water supply pipe flange (24) and the connecting branch pipe flange (26); How to replace a water supply pipe, including:

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