How to remove the resection device

Abstract

To provide a removal method of a cutting device which can remove the cutting device together with a cut piece by using a crane which is suppressed in a lift capacity.SOLUTION: A method for removing a cutting device 5 by using a crane together with a cut piece 1a which is cut from a fluid pipe 1 in an uninterruppted state after cutting the fluid pipe 1 in a box body 2 which is attached to the fluid pipe 1 is composed of: a block process for blocking a working valve 4 after moving a cutter 52 to an opening part 2b side of the box body 2 together with the cut piece 1a rather than the working valve 4 which can open and close the inside of the box body 2; a drive mechanism removal process for removing a drive mechanism 8 which is released in connection with the cutter 52 by using the crane; a lid body removal process for removing a lid body 53 which is released in connection with the box body 2 by using the crane; and a cutter removal process for removing the cutter 52 from the box body 2 by using the crane together with the cut piece 1a.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a method for removing an excision device, which excises a part of a fluid pipe, from a housing attached to the fluid pipe, without interrupting the flow of the fluid. [Background technology]

[0002] In the case of existing fluid pipes that constitute existing pipelines through which water, gas, etc. flow, in order to deal with deterioration over time or to form new branch paths, it is sometimes necessary to replace a part of the existing fluid pipe with a new fluid pipe or to cut off a deteriorated pipeline. In such cases, a cutting device may be used to cut off a part of the fluid pipe.

[0003] As a method for cutting a fluid pipe in this way, a method for cutting a fluid pipe in an uninterrupted flow state is known. In this method, a housing that is hermetically attached to the wall of the existing fluid pipe, an operating valve that can open and close the inside of the housing, and a cutting device that is hermetically attached to the opening of the housing are used. This cutting device is mainly composed of a cutter for cutting the fluid pipe, a cover that can hermetically close the opening of the housing, and a drive mechanism for moving the cutter back and forth and rotating the cutter.

[0004] When cutting a fluid pipe using a cutting device constructed from these components, with a cutter placed inside the housing, the opening of the housing is closed with a lid, the cutter, which is rotated by the drive mechanism, is advanced toward the fluid pipe to cut it, and the cutter together with the cut piece is retracted above the working valve by the drive mechanism, and the inside of the housing is then closed with the working valve, thereby maintaining an uninterrupted flow throughout the entire process.

[0005] Such an excision device is generally hung by a crane and attached to the installation position inside the housing. In particular, when the diameter of the fluid pipe is large, the structure of the excision device becomes large and heavy, so a large crane with high lifting capacity is required to transport the excision device in an assembled state. Therefore, a large space is required for the placement and handling of the crane.

[0006] Therefore, for example, in the installation of the excision device shown in Patent Document 1, a crane is used to suspend a cover for closing the top of the housing together with a cutter, and after the cover is hermetically attached to the housing, the same crane is used to suspend the drive mechanism in a separate process, and the drive mechanism is connected to the cutter and the cover to assemble the excision device. This reduces the lifting capacity required for the crane. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2019-74123 A (pages 6 and 7, Figure 5) Summary of the Invention [Problem to be solved by the invention]

[0008] When installing the excision device of Patent Document 1, the excision device can be attached to the housing using a crane with a low lifting capacity, so that the working valve can be installed even in work environments where a large space cannot be secured.

[0009] On the other hand, when removing the excision device from the housing after cutting the fluid pipe, the process is reversed from that for installing the excision device, that is, the drive mechanism and the cover holding the cutter are removed from the housing separately. However, the cutter after cutting is heavy because it holds the piece of fluid pipe, and the weight of the piece increases as the diameter of the fluid pipe increases or the cut portion of the fluid pipe increases, so there was a risk that the lifting capacity of the crane used for installing the excision device would be exceeded. Therefore, it was necessary to prepare a crane with a high lifting capacity in anticipation of the weight of the piece.

[0010] The present invention has been made in view of these problems, and has as its object to provide a method for removing an excision device that enables the device to be removed together with the section using a crane with a low lifting capacity. [Means for solving the problem]

[0011] In order to solve the above problems, the method for removing an excision device of the present invention includes the steps of: A method for removing a cutting device by using a crane together with a cut piece from a fluid pipe in an uninterrupted flow state after cutting the fluid pipe inside a housing attached to the fluid pipe, the method comprising the steps of: The excision device includes at least a cutter for holding the slice, a cover body installed on an opening of the housing, and a drive mechanism for driving the cutter; a closing step of moving the cutter together with the piece toward an opening side of the housing relative to a working valve capable of opening and closing the housing, and then closing the working valve; a drive mechanism removing step of removing the drive mechanism that has been disconnected from the cutter by using the crane; a lid removal process of removing the lid that has been released from the housing by using the crane; and a cutter removal step of removing the cutter together with the cut piece from the housing by using the crane. According to this feature, the load on the crane when removing the cutter together with the section can be reduced by removing the cover that has been disconnected from the housing prior to removing the cutter. This allows the excision device to be removed together with the section using a crane with a reduced lifting capacity that was used during installation.

[0012] The excision device further includes a holding means for holding the cutter that has been moved to a side of the opening of the housing relative to the working valve, The present invention is characterized in that a holding step of holding the cutter by the holding means is carried out between the closing step and the lid body removing step. According to this feature, since the cutter can be held on the housing by the holder, the lid can be removed.

[0013] the holding means includes a holder that is movable in a radial direction relative to the housing, The holding step is characterized in that the holder is advanced into the housing to hold the cutter. According to this feature, the operation for holding the cutter can be performed from the outside.

[0014] the cover body includes a moving means for moving the drive mechanism together with the cutter in a direction away from the fluid pipe, The holding step is characterized in that the moving means moves the cutter together with the drive mechanism in a direction away from the fluid pipe, and then the holder is advanced into the housing. According to this feature, the operation of holding the cutter with the holder can be easily performed.

[0015] In the cutter removing step, a hoisting means for connecting the cutter to the crane is provided. This feature allows for easy connection of the crane to the cutter.

[0016] In the cutter removing step, the crane is coupled to a plurality of the suspended means provided at equally spaced locations in the circumferential direction of the cutter. This feature makes it easier to balance the weight when the cutter is suspended by a crane. [Brief description of the drawings]

[0017] [Figure 1] FIG. 11 is a side cross-sectional view showing a state in which a housing is attached to a fluid pipe in the embodiment. [Diagram 2] 13 is a side cross-sectional view showing a state in which a cutter is inserted into a housing in a process of attaching the cutting machine. FIG. [Diagram 3] FIG. 11 is a side cross-sectional view showing how a drive mechanism is connected to a cutter in a process of installing the cutting machine. [Figure 4] FIG. 11 is a side cross-sectional view showing a state in which a drive mechanism is connected to a cutter in a process of attaching the cutting machine. [Diagram 5]11 is a side cross-sectional view showing a state in which a fluid pipe is cut by a cutting machine. FIG. [Figure 6] 13 is a side cross-sectional view showing a state in which the housing is closed by the operation valve in a process of removing the cutting machine. FIG. [Figure 7] FIG. 11 is a side cross-sectional view showing how the cutter is held in the process of removing the cutting machine. [Figure 8] 13 is a side cross-sectional view showing the state in which the drive mechanism has been removed from the cutter in the process of removing the cutting machine. FIG. [Figure 9] 11 is a side cross-sectional view showing the state in which the cover is removed from the housing in the process of removing the cutting machine. FIG. [Figure 10] FIG. 11 is a plan view for explaining the connection between the cutter and the crane. [Figure 11] 11 is a side cross-sectional view showing the state in which the cutter is removed from the housing together with the cut piece in the process of removing the cutting machine. FIG. [Figure 12] FIG. 11 is a plan view for explaining a connection between a cutter and a crane in another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for removing a resection device according to the present invention will be described below with reference to the accompanying drawings. EXAMPLES

[0019] In the embodiment, a series of steps from cutting a predetermined portion of an existing fluid pipe 1 constituting a flow path component by a cutting machine 5 as a cutting device to removing the cutting machine 5 in an uninterrupted flow state will be described with reference to Figures 1 to 12.

[0020] As shown in Fig. 1, a predetermined portion of a fluid pipe 1 buried in the ground is excavated, and a two-part housing 2 having a branch portion 2a opening upward is enclosed in a sealed manner. The fluid in the fluid pipe 1 may be, for example, clean water, industrial water, sewage, or a gas or a gas-liquid mixture of gas and liquid. Furthermore, although the housing 2 has a two-part structure in this embodiment, it may have a multi-part structure, and the divided housings may be joined together by welding or bolts via packing.

[0021] The fluid pipe 1 is a steel pipe and is formed into a generally circular cross section. The fluid pipe according to the present invention may be made of other metals such as cast iron or ductile cast iron, or may be made of concrete, polyvinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner circumferential surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, or the like, or the inner circumferential surface of the fluid pipe may be covered with an appropriate material by powder coating.

[0022] Furthermore, when attaching the housing 2 to the fluid pipe 1, a concrete foundation (not shown) is formed below the housing 2 to support the weight around the housing 2 and prevent bending of the fluid pipe 1. Note that the foundation is not limited to concrete, and a jack or the like may be used as long as it can support the weight of the housing 2 and the cutting machine 5.

[0023] Furthermore, a packing (not shown) is pressed in the circumferential direction between the pipe wall of the fluid pipe 1 and the housing 2, thereby ensuring a tight seal between the fluid pipe 1 and the housing 2. The packing may be press-fitted into a groove provided on the housing 2 side, or may be press-fitted into a groove provided on the fluid pipe 1 side.

[0024] The housing 2 is also provided with an operating valve 4 capable of closing the opening of the branching portion 2a. The operating valve 4 is mainly composed of a substantially cylindrical valve box 41 connected to the upper part of the branching portion 2a in a sealed manner, a valve element 42 capable of being seated on a valve seat 41a of the valve box 41, a valve lid 43 connected to the valve box 41 in a sealed manner and capable of accommodating the valve element 42, and a valve stem 44 connecting the valve element 42 to the valve lid 43 in a movable manner. The operating valve 4 can close the inside of the housing 2 by advancing the valve element 42 toward the valve box 41 and seating it on the valve seat of the valve box 41 by rotating the valve stem 44 forward or backward, or can open the inside of the housing 2 by retracting the valve element 42 toward the valve lid 43.

[0025] The housing 2 also includes a substantially cylindrical mounting flange tube 21 that is hermetically connected to the upper part of the valve box 41. The mounting flange tube 21 has an opening 2b at its upper end that opens upward.

[0026] Next, a process of attaching the cutter 5 for cutting the fluid pipe 1 above the mounting flange tube 21 will be described. As shown in Fig. 2, first, a cutter 52 and a cover 53 are temporarily installed on the mounting flange tube 21. In detail, the cutter 52 and the cover 53 of the mounting flange tube 21 connected above it are suspended together by a hoist C equipped with a hook and a wire W supported by a crane (not shown), and lowered to above the mounting flange tube 21.

[0027] The crane used in this embodiment is preferably a mobile rough terrain crane, and it goes without saying that the size of the crane is increased according to its lifting capacity. Furthermore, the installation area of ​​the crane, including outriggers, often requires an area larger than the excavation area of ​​the fluid pipe 1. The rough terrain crane to be used is selected based on the presence or absence of the lifting capacity capable of lifting the heaviest member among the members, the allowable lifting load within the turning radius, etc.

[0028] The cutter 52 is composed of a cylindrical member 52a equipped with a cutting blade at its peripheral end, and a center drill 52b arranged coaxially on the cylindrical member 52a and projecting forward of the boring blade, and the cylindrical member 52a and the center drill 52b are fixed. In addition, an adapter 54 having an annular projection 54a formed at its upper end is attached above the cylindrical member 52a and the center drill 52b so as not to rotate relative to each other.

[0029] The cover 53 has a through hole 53a formed in the center thereof penetrating in the vertical direction, and an adaptor 54 is inserted into the through hole 53a. The cover 53 also has a plurality of recesses 53b formed in the circumferential direction, recessed from the inner peripheral surface of the through hole 53a in the outer diameter direction, and a fixing jig 55 capable of moving forward and backward in the radial direction of the through hole 53a is disposed in the recesses 53b. The fixing jig 55 protrudes in the inner diameter direction of the through hole 53a and engages with the lower surface of the annular protrusion 54a of the adaptor 54, thereby releasably connecting the cutter 52 and the cover 53. A plurality of jacks 7 (moving means) capable of expanding and contracting in the vertical direction are fixed to the upper surface of the cover 53 on the outer diameter side of the through hole 53a.

[0030] 3, the lid 53 is placed on the mounting flange tube 21, and in this state, the mounting flange tube 21 and the lid 53 are aligned and fixed with bolts and nuts (not shown). As a result, the opening 2b of the mounting flange tube 21 that constitutes the housing 2 is sealed, and the cutter 52 is housed inside the mounting flange tube 21.

[0031] Furthermore, a packing (not shown) is pressed in the circumferential direction between the opening 2b of the mounting flange tube 21 and the lid body 53, ensuring a tight seal between the mounting flange tube 21 and the lid body 53. The packing may be pressed into a groove provided on the lid body 53 side, or may be pressed into a groove provided on the mounting flange tube 21 side.

[0032] Next, the drive mechanism 8 of the cutting machine 5 is connected to the cutter 52. First, the structure of the drive mechanism 8 will be described.

[0033] As shown in Figure 3, the drive mechanism 8 is mainly composed of an axis member 81, a gripping member 82 capable of gripping or releasing the grip of the axis member 81, an advancing / retreating member 83 for moving the gripping member 82 forward and backward within the axial range of the axis member 81, a regulating member 84 capable of restricting or releasing the movement of the axis member 81 at a position below the advancing / retreating member 83, and a base member 85 to which the advancing / retreating member 83 and the regulating member 84 are attached.

[0034] Base member 85 is provided with a plurality of support columns standing upward, and advance / retract member 83 is attached so as to be slidable up and down along the support columns. That is, shaft member 81 is gripped by gripping member 82, and in this state, advance / retract member 83 is moved along the support columns, whereby shaft member 81 can be slid up and down.

[0035] Further, a cylindrical case portion 86 into which the shaft member 81 can be inserted is provided below the base member 85. An extension piece portion 86a is formed on the lower edge of the case portion 86, extending in a substantially horizontal direction.

[0036] A rotary motor 87 is fixed to a part of the advancing / retreating member 83, and the rotary motor 87 applies a rotational force to the gripping member 82 gripping the shaft member 81, thereby transmitting rotation to the shaft member 81, and the rotation of the shaft member 81 causes the cutter 52 to rotate. Note that by preparing multiple shaft members 81, it is possible to extend the axial length by adding more members, and this extension structure makes it possible to reduce weight and height.

[0037] When connecting the drive mechanism 8 configured in this manner to the cutter 52, referring to Figure 4, the shaft member 81 is advanced downward a predetermined distance in advance so that the lower end of the shaft member 81 protrudes downward beyond the case portion 86. The drive mechanism 8 is then suspended by the hanging device C and wire W, and the extension piece 86a of the case portion 86 is fixed to the upper end of a rod extending upward from the base of the jack 7.

[0038] Next, an operator accesses the gap between the case portion 86 and the upper flange 53c of the cover body 53 and connects the shaft member 81 and the adapter 54 with bolts and nuts. Then, the fixing jig 55 is retreated into the recess 53b. Here, the extension piece 86a is not necessarily required, and for example, a support mechanism may be placed between the upper flange 53c and the drive mechanism 8. Also, it may be placed on the ground instead of on the upper flange 53c.

[0039] 4, the rod is stored in the base of the jack 7, the case 86 is placed on the upper flange 53c of the cover 53, and the case 86 and the cover 53 are fixed with bolts and nuts (not shown). As a result, the cutter 52, the cover 53, the adapter 54, and the drive mechanism 8 constitute the cutting machine 5, so that the load on the crane in one lifting can be reduced compared to the case where the cutting machine 5 is transported as a whole. This allows the cutting machine 5 to be installed on the housing 2 using a small crane with a low lifting capacity. At this time, it goes without saying that the center drill 52b is adjusted so as not to come into contact with the valve body 42 when closed (see FIG. 6).

[0040] In this embodiment, the driving mechanism 8 is lowered by the jack 7, but to enhance safety, the driving mechanism 8 may be lowered by the jack 7 while being loosely suspended by the hoisting tool C and the wire W. In this way, the load on the crane can be reduced, and the load on the crane can be lightened. Also, the driving mechanism 8 may be lowered by a crane without using the jack 7.

[0041] Furthermore, when the case portion 86 and the lid body 53 are fixed together, a packing (not shown) is pressed between the case portion 86 and the upper flange 53c of the lid body 53, thereby ensuring airtightness between the case portion 86 and the lid body 53. The packing may be press-fitted into an annular groove formed in the lower surface of the case portion 86, or may be press-fitted into an annular groove provided on the upper flange 53c side of the lid body 53.

[0042] 5, the valve body 42 of the working valve 4 is retracted into the valve cover 43 to open the branch portion 2a, and the drive mechanism 8 is operated to move the cutter 52 forward to cut the fluid pipe 1 without interrupting the flow. At this time, by connecting another shaft member 81' to the shaft member 81, the distance by which the cutter 52 is moved can be appropriately adjusted.

[0043] Furthermore, a recess 2e is formed in the bottom of the housing 2 so as to be recessed downward. When the fluid pipe 1 is cut with the cutter 52, the center drill 52b, which protrudes downward beyond the lower end of the cylindrical member 52a, is accommodated in the recess 2e in a spaced-apart state, thereby preventing the center drill 52b from accidentally damaging the housing 2.

[0044] Furthermore, a valve (not shown) is attached to the bottom of the recess 2e. By opening this valve, chips generated when the fluid pipe 1 is cut by the cutter 52 can be discharged to the outside together with the fluid through a drain.

[0045] As shown in Fig. 6, the tip of the center drill 52b is provided with a holder 52g which is expandable in the outer diameter direction of the center drill 52b and which engages and holds a section 1a of the fluid pipe 1, which will be described later. While the center drill 52b is drilling the wall of the fluid pipe 1, the holder 52g is stored on the inner diameter side of the outer periphery of the center drill 52b, as shown by the dotted line in the bubble of Fig. 6, and when the center drill 52b has penetrated the pipe wall, the holder 52g expands on the outer diameter side of the outer periphery of the center drill 52b, as shown by the solid line in the bubble of Fig. 6. As a result, the section 1a of the fluid pipe 1 cut by the cutter 52 is engaged by the holder 52g and held inside the cylindrical member 52a.

[0046] Next, there will be described a method for removing the cutter 5. The removal of the cutter 5 is performed in the order of a closing step, a holding step, a drive mechanism removing step, a lid removing step, and a cutter removing step.

[0047] First, as shown in Fig. 6, a closing step is performed. In this step, the drive mechanism 8 is operated to pull the cutter 52 together with the cut piece 1a upward, and the valve body 42 of the working valve 4 is moved back into the mounting flange tube 21 above the movable position. Then, the valve rod 44 is rotated forward to advance the valve body 42 into the valve box 41, and the inside of the housing 2 is closed.

[0048] 7, a holding process is performed. In this process, first, the bolts and nuts that secure the case portion 86 of the drive mechanism 8 to the upper flange 53c of the cover body 53 are removed, and the jack 7 is extended and moved upward together with the drive mechanism 8 and the cutter 52.

[0049] Here, a plurality of recesses 21a are formed in the circumferential direction on the peripheral wall of the mounting flange tube 21, recessed from the inner peripheral surface in the outer diameter direction. As shown in the balloon of Fig. 7, a holder 90 that can advance and retreat in the radial direction of the mounting flange tube 21 is disposed in the recess 21a. The holder 90 is prevented from rotating by the inner peripheral surface of the recess 21a. A spindle 91 is rotatably supported on the outer diameter end of the recess 21a. The spindle 91 has a male screw formed thereon that is screwed into a female screw hole of the holder 90.

[0050] As a result, by rotating forward or backward the operating portion of the spindle 91, which is open to the outside of the mounting flange tube 21, the holder 90 advances to the inner diameter side of the mounting flange tube 21, or the holder 90 retreats into the recess 21a. In other words, the mounting flange tube 21, which is part of the housing 2, the holder 90 and the spindle 91 constitute the holding means 9 of the present invention.

[0051] Further, an annular flange 52c formed to protrude outwardly is formed on the upper end of the cylindrical member 52a of the cutter 52. The flange 52c may be formed on an upper end 52d (see FIG. 10) of the cutter 52, which will be described later, and the forming location and shape may be appropriately changed as long as the cutter 52 can be held. For example, the flange 52c may be a protrusion that is aligned with the position of the holder 90, instead of being annular.

[0052] Returning to the explanation of the holding step, the spindle 91 is rotated in the forward direction from the outside of the mounting flange tube 21 to advance the holder 90 toward the inner diameter side of the mounting flange tube 21 and engage with the underside of the flange 52c of the cutter 52, thereby holding the cutter 52 in the housing 2. At this time, since the cutter 52 has been moved by the jack 7 as described above, the cutter 52 can be easily held by the holder 90. In addition, the flange 52c of the cutter 52 allows the holder 90 to easily lock the cutter 52.

[0053] Next, as shown in Figures 7 and 8, a drive mechanism removal process is performed. In this process, the bolts and nuts connecting the shaft member 81 and the adapter 54 are removed, and the connection between them is released. Even after the connection is released, the load of the cutter 52 and the piece 1a is held to the housing 2 by the holder 90. Next, the fixation between the rod of the jack 7 and the extension piece 86a of the case part 86 is also released. Then, although not shown directly, the drive mechanism 8 is lifted up by the lifting tool C and the wire W and removed (see Figure 8).

[0054] Next, a lid removal process is performed as shown in Figures 8 and 9. In this process, the bolts and nuts that secure the mounting flange tube 21 and the lid 53 are removed, and the lid 53 is lifted up by the lifting tool C and wire W and removed (see Figure 9).

[0055] Next, a cutter removal process is performed as shown in Figures 10 and 11. In this process, as shown in Figure 10, first, a shackle S is attached to four female screw holes 52e formed at equal intervals in the circumferential direction on the upper end portion 52d of the cutter 52. At this time, since the cutter 52 is held near the opening 2b at the upper end of the housing 2, it is easy to attach the shackle S.

[0056] Then, the wire W is connected to the shackle S, and the cutter 52 is lifted together with the piece 1a by the lifting tool C and the wire W, and removed (see FIG. 11). At this time, since the female screw holes 52e are arranged at four equal intervals in the circumferential direction of the cutter 52, it is easy to balance the weight when suspending the cutter 52. This allows the cutter 52 and the piece 1a to be safely removed without tilting. In this way, the female screw holes 52e and the shackle S constitute the suspended means of this embodiment. The female screw holes 52e are not limited to being arranged at four equal intervals, and may be arranged at two or more equal intervals, and may not be arranged at equal intervals, and the number and arrangement may be changed as appropriate. In addition, the mounting position of the shackle S may be appropriately selected from among the multiple (for example, 10) female screw holes 52e.

[0057] 12, six equally spaced communication holes 52f for releasing fluid when cutting the fluid pipe 1 are provided in the upper end 52d of the cutter 52, so that a suspending tool C may be hooked to a suspending belt B attached by passing through a pair of adjacent communication holes 52f, 52f, and the cutter 52 may be hoisted together with the cut piece 1a by the suspending tool C and the belt B and removed. In other words, the upper end 52d of the cutter 52 having the communication holes 52f is also a suspending means.

[0058] Although not shown directly in the drawings, the shackle S, wire W, and belt B may be used in combination to distribute the load acting on them.

[0059] In this manner, while maintaining an uninterrupted flow state, the fluid pipe 1 can be cut, the cutter 5 can be removed from the housing 2, and the cut piece 1a can be collected.

[0060] As described above, in the method of removing the cutting machine 5 of this embodiment, the load on the crane when removing the cutter 52 together with the piece 1a can be reduced by removing the cover 53 that has been disconnected from the housing 2 prior to removing the cutter 52. This allows the cutting machine 5 to be removed together with the piece 1a using a small crane with a low lifting capacity that was used during installation.

[0061] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0062] For example, in the above embodiment, a cutting machine 5 having a cutter 52 which is a hole saw is used as an example of the excision device, but this is not limited to this, and the excision device may be a drilling machine or any device that can excise at least a portion of the peripheral wall of the fluid pipe 1.

[0063] Furthermore, while the holding means 9 has been described as being composed of the mounting flange tube 21, the holder 90, and the spindle 91, this is not limited to this, and the holding means may, for example, be configured such that the holder 90 and the spindle 91 are provided on the valve box 41 of the working valve 4 or a lid body having a cylindrical portion, or may be configured such that the cutter 52 is placed on the valve body 42 of the working valve 4, or may be modified as appropriate.

[0064] In addition, the retainer 90 has been described as being configured to move radially in response to the rotation of the spindle 91, but this is not limited to this and may be, for example, a bolt screwed into the peripheral wall of the mounting flange tube 21, or may be configured to move radially by a jack, or may be modified as appropriate.

[0065] Further, although the jack 7 is fixed to the cover 53 in the above description, the present invention is not limited thereto, and the jack 7 may be provided detachably. [Explanation of symbols]

[0066] 1 Fluid tube 1a intercept 2. Chassis 2b opening 4 Working valve 5 Cutting machine (cutting device) 7 Jack (means of transportation) 8 Driving mechanism 9 Retention means 52 Cutter 52d Upper end (suspended means) 52e Female screw hole (suspended means) 53 Lid 90 Holder 91 Spindle S Shackle (Means of Suspension)

Claims

1. A method for removing a cutting device by using a crane together with a cut piece from a fluid pipe in an uninterrupted flow state after cutting the fluid pipe inside a housing attached to the fluid pipe, the method comprising the steps of: The excision device includes at least a cutter having a center drill and a cylindrical member for engaging and holding the slice, a lid body installed in an opening of the housing, a drive mechanism for driving the cutter, and a holding means provided in the housing below the lid body and for holding a protrusion formed on an upper portion of the cylindrical member of the cutter; a closing step of moving the cutter together with the piece toward an opening side of the housing relative to a working valve capable of opening and closing the housing, and then closing the working valve; a holding step of holding the cutter and the slice by the holding means; a drive mechanism removing step of removing the drive mechanism that has been disconnected from the cutter by using the crane; a lid removal process of removing the lid, which has been disconnected from the housing, by using the crane, while leaving the cutter and the piece held by the holding means; and a cutter removing step of removing the cutter together with the piece from the housing using the crane.

2. the holding means includes a holder that is movable in a radial direction relative to the housing, 2. The method for removing a resection device according to claim 1, wherein in the holding step, the holder is advanced into the inside of the housing to hold the cutter.

3. the cover body includes a moving means for moving the drive mechanism together with the cutter in a direction away from the fluid pipe, The method for removing a resection device according to claim 2, wherein in the holding step, the moving means moves the cutter together with the drive mechanism in a direction away from the fluid pipe, and then the holder is advanced into the housing.

4. 4. The method for removing an excision device according to claim 1, further comprising the step of providing a suspending means for connecting the cutter to the crane in the cutter removing step.

5. 5. The method for removing an excision device according to claim 4, wherein in the cutter removing step, the crane is connected to a plurality of the suspended means provided at equally spaced locations in the circumferential direction of the cutter.

Images