Assembling method of installation device of rectification body

Abstract

To provide an assembling method of an installation device of a rectification body which can alleviate a burden on a crane.SOLUTION: Provided is an assembling method of an installation device of a rectification body comprising: a housing 2 hermitically attached to a fluid pipe 1; a working valve 4 attached to an opening part of the housing and capable of opening and closing the inside of the housing; and a cutter attached to the working valve, wherein a rectification body 10 having valve main body parts for controlling a flow passage of the fluid pipe and an upper lid part is installed by suspending the cutter and the rectification body in a space where no fluid in a pipe exists in order to install the rectification body in the housing where the fluid pipe is cut by using the cutter in an uninterrupted flow state. The rectification body is constituted of divided bodies of the valve main body parts 11, 12 and 13, and the upper lid part 14. The valve main body part being a first divided body out of the divided bodies is hung down after hermitically attaching the housing to the fluid pipe. The valve main body parts are brought into locked states by a locking part 62 supported by the housing. The upper lid part being the remaining second divided body is hung down. After the upper lid part is assembled to the valve main body part locked to the locking part, the lock of the locking part is released.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present invention relates to a method for assembling an installation device for installing a flow restrictor in a housing that seals a fluid pipe under an uninterrupted flow condition. [Background technology]

[0002] When arranging a flow control device such as a valve or plug in a fluid pipeline, it is common to cut a part of the fluid pipe that constitutes the fluid pipeline and install a flow control device at the cut location. A known cutting method for cutting a fluid pipe involves attaching a housing to the fluid pipe in a sealed manner, attaching an operating valve that can open and close the inside of the housing to an opening of the housing, and installing a cutting machine having a cutter and a drive unit on the operating valve, and cutting a part of the fluid pipe in an uninterrupted flow state inside the housing by moving the cutter with the drive unit while the operating valve is open.

[0003] As a method for installing a fluid regulator at a location where a fluid pipe has been cut by the above-mentioned method, for example, there is a fluid regulator installation method using a housing, an operating valve, and an insertion machine attached to the operating valve, as shown in Patent Document 1, in which the fluid regulator is advanced by the insertion machine with the operating valve in an open state, thereby installing the fluid regulator in an uninterrupted flow state within the housing. In this type of fluid regulator installation method, each component such as the housing, operating valve, and fluid regulator is suspended by a crane and transported to the installation position, and then assembled to the fluid pipe (see Patent Document 1, for example). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-108594 A (page 11, figure 9) Summary of the Invention [Problem to be solved by the invention]

[0005] However, when installing a fluid control device as in Patent Document 1, especially when the diameter of the fluid pipe is large, the housing that fits the fluid pipe, the working valve, and the fluid control device installed in the housing also become large, so a large crane with high lifting capacity is required, and since the range of movement and installation space of the crane become large, a large space must be reserved for the installation work of the fluid control device. In particular, when a hole saw is used as a cutting machine as in Patent Document 1, a hole saw with a diameter larger than the outer diameter of the fluid pipe is required, and therefore the weight of the housing that houses the hole saw and the fluid control device installed in a sealed state in this housing increases, making it unavoidable to increase the size of the crane.

[0006] The present invention has been made in view of the above-mentioned problems, and has an object to provide a method for assembling a fluid control installation device that can reduce the load on the crane. [Means for solving the problem]

[0007] In order to solve the above problems, the method for assembling a flow control device of the present invention includes the steps of: A method for assembling a fluid regulator installation device for installing a fluid regulator in the housing in an uninterrupted flow state, the fluid regulator installation device comprising: a housing that is attached in a sealed manner to a fluid pipe; an operating valve that is attached to an opening of the housing and capable of opening and closing the inside of the housing; a cutter that is attached to the operating valve and cuts the fluid pipe inside the housing; and a cutting machine having a drive unit that drives the cutter, the method comprising the steps of: At least one of the operating valve, the cutting machine, or the fluid control device is composed of a plurality of divided bodies, and the divided bodies are sequentially assembled to the housing after the housing is hermetically attached to the fluid pipe. According to this feature, the multiple divided bodies constituting the operating valve, the cutting machine, or the fluid control device can be transported separately by a crane, reducing the load on the crane that suspends and supports them and enabling the crane to be made smaller.

[0008] The method is characterized in that a first divided body among the plurality of divided bodies is engaged with a locking portion provided on the housing, and the remaining second divided body is assembled to the first divided body engaged with the locking portion. According to this feature, in a stable state in which a first divided body among the multiple divided bodies is engaged with the engaging portion of the housing, the remaining second divided body can be attached to this first divided body with high precision.

[0009] The method is characterized in that the second divided body is assembled to the first divided body while the second divided body is connected to a crane. According to this feature, it is possible to prevent the second divided body from dropping when assembling the second divided body to the first divided body, thereby improving safety.

[0010] The cutting machine is configured with the cutters and the drive unit as the multiple divided bodies, and the drive unit is characterized in that the fluid control unit is connected so that it can be inserted into the housing. According to this feature, since the drive unit and the cutter that constitute the cutting machine are separate, the drive unit for driving the cutter can be used as a fluid control insertion tool. [Brief description of the drawings]

[0011] [Figure 1] FIG. 4 is a side cross-sectional view showing how a valve body of an operating valve is attached to a housing in the embodiment. [Diagram 2] FIG. 4 is a side cross-sectional view showing how a valve body and a valve stem are attached to a valve box. [Diagram 3] FIG. 11 is a side cross-sectional view showing how a mounting flange tube is attached to a working valve in the process of installing the cutting machine. [Figure 4] 11 is a side cross-sectional view showing how a cutter and a lid are attached to a mounting flange tube in a process of installing the cutting machine. FIG. [Diagram 5] 13 is a side cross-sectional view showing the state in which the lid body is fixed to the mounting flange tube in the process of installing the cutting machine. FIG. [Figure 6] FIG. 4 is an explanatory diagram showing the structure of a drive mechanism. [Figure 7]13 is a side cross-sectional view showing a state in which a shaft member and a cutter are connected in a process of installing the cutting machine. FIG. [Figure 8] 13 is a side cross-sectional view showing a state in which a jack and a fixing jig are removed in a process of installing the cutting machine. FIG. [Figure 9] 13 is a side cross-sectional view showing a state in which a case portion of the drive mechanism and a cover body are connected in a process of installing the cutting machine. FIG. [Figure 10] 11 is a side cross-sectional view showing a state in which a fluid pipe is cut by a cutting machine. FIG. [Figure 11] FIG. 11 is a side cross-sectional view showing the state in which the section of the fluid pipe has been collected. [Figure 12] FIG. 11 is a side cross-sectional view showing a state in which a cylindrical member is attached to an operating valve in a process of installing a valve introducer. [Figure 13] 1 is a side cross-sectional view showing a state in which a partition wall, an opening / closing shaft, and a valve body of a butterfly valve are attached to a cylindrical member in a process of installing a valve introducer. FIG. [Figure 14] FIG. 11 is a side cross-sectional view showing the state in which the upper cover portion is attached to configure the butterfly valve in the process of installing the valve introducer. [Figure 15] FIG. 11 is an explanatory diagram showing a state in which a mounting flange tube is attached to a cylindrical member in a process of installing a valve introducer. [Figure 16] FIG. 11 is a side cross-sectional view showing the installation of a valve hanger and a cover in the process of installing the valve introducer. [Figure 17] FIG. 11 is a side cross-sectional view showing a state in which a cover is fixed to a mounting flange cylinder in a process of installing the valve introducer. [Figure 18] FIG. 11 is a side cross-sectional view showing a state in which a shaft member and a valve hanging fitting are connected in a process of installing a valve introducer. [Figure 19] FIG. 11 is a side cross-sectional view showing a state in which a jack and a fixing jig are removed in a process of installing a valve introducer. [Figure 20] FIG. 11 is a side cross-sectional view showing a state in which a butterfly valve and a valve hanging fitting are connected in the process of installing the valve introducer. [Figure 21] 1 is a side cross-sectional view showing a butterfly valve being installed at a cut portion of a fluid pipe by a valve introducer. FIG. [Figure 22] A side cross-sectional view showing the valve suspension fitting being pulled up into the cylindrical member and the mounting flange tube. [Diagram 23] FIG. 4 is a side cross-sectional view showing an operating valve in Modification 1. [Figure 24] FIG. 11 is a side cross-sectional view showing an operating valve in Modification 2. [Diagram 25] FIG. 11 is a side cross-sectional view showing a cutting machine in a third modified example. [Figure 26] 13A is a side cross-sectional view showing a cutting machine in a fourth modified example, FIG. 13B is a view taken along the line A, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an embodiment of the method for assembling a flow control installation device according to the present invention. EXAMPLES

[0013] In the embodiment, a series of steps from cutting a predetermined portion of an existing fluid pipe 1 constituting a flow path component to installing a butterfly valve 10 (flow control) at the cut portion will be described with reference to Figs. 1 to 26.

[0014] 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.

[0015] The fluid pipe 1 is a steel pipe and is formed in a generally circular cross section. The fluid pipe according to the present invention may be made of ductile cast iron, other cast iron, other metals, concrete, polyvinyl chloride, polyethylene, polyolefin, etc. Furthermore, the inner circumferential surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, etc., or the inner circumferential surface of the fluid pipe may be covered with an appropriate material by powder coating.

[0016] Furthermore, when the housing 2 is attached to the fluid pipe 1 in a sealed state, concrete foundations 9, 9 are formed below the housing 2 to support the weight around the housing 2 and prevent bending of the fluid pipe 1. Note that the foundations are not limited to the concrete foundations 9, 9, and jacks or the like may be used as long as they can support the weight of the housing 2 and the cutting machine 5 and valve introduction machine 6 described below.

[0017] Next, a process of attaching the working valve 4 capable of closing the opening of the branching part 2a to the branching part 2a (opening) of the housing 2 will be described. First, as shown in FIG. 1, the valve box 41 (first divided body) constituting the working valve 4 is suspended from above by a hoisting tool C equipped with a hook suspended by a crane (not shown) and a wire W, and placed on the flange 2b of the branching part 2a, and the flange 2b and the valve box 41 are fixed with bolts and nuts (not shown) while adjusting the position of the valve box 41 on the flange 2b. Note that the crane used in this embodiment is preferably, for example, a mobile rough terrain crane, and it goes without saying that it is made large according to its lifting capacity, and the specifications capable of lifting the heaviest member among the members described later are selected while considering the allowable lifting load at each turning radius. In addition, the installation area of ​​the crane, including outriggers, often requires an area larger than the excavation area of ​​the fluid pipe 1.

[0018] In this embodiment, even after the valve box 41 is placed on the flange 2b of the branch section 2a, the valve box 41 is connected to the crane with the wire W slightly loosened to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the valve box 41. Also, in order to make it easier to adjust the position of the valve box 41, the position of the valve box 41 may be adjusted relative to the flange 2b while being slightly suspended by the crane.

[0019] The valve box 41 is generally cylindrical and penetrates vertically, and has a slide groove 41b extending generally horizontally from an opening 41a provided on one side, and a valve seat 41c is formed on the inner side of the slide groove 41b (opposite the opening 41a). The weight of the valve box 41 in this embodiment is approximately 4500 kg. An O-ring (not shown) is pressed between the flange 2b and the valve box 41, so that the branch part 2a and the valve box 41 are connected in a sealed state. The weights of the various components described below are merely examples and can be changed as appropriate.

[0020] Next, as shown in Fig. 2, the valve element 42, valve cover 43 and valve stem 44 (second divided body) constituting the working valve 4 are suspended in a unitized state by a hoisting tool C and a wire W and lowered to the side of the opening 41a of the valve box 41. Then, in this suspended state, the valve cover 43 is fixed to the side of the valve box 41 by bolts and nuts (not shown) (see Fig. 3). In detail, the valve element 42 is attached so as to be movable between a position where it is housed in the valve cover 43 by the valve stem 44 and a position where it protrudes from the valve cover 43. At the position where it is housed in the valve cover 43, a part of the valve element 42 (the end on the opposite side to the valve stem 44 (the valve box 41 side)) protrudes from the opening 43a of the valve cover 43.

[0021] When fixing the valve cover 43 to the side of the valve box 41, the protruding portion of the valve body 42 protruding from the opening 43a of the valve cover 43 is inserted into the opening 41a of the valve box 41, the valve cover 43 is slid horizontally until it abuts against the valve box 41, and the valve cover 43 and the valve box 41 are fixed with bolts and nuts (not shown). The weight of the valve body 42, the valve cover 43, and the valve stem 44 in this embodiment is approximately 6000 kg when unitized.

[0022] Furthermore, since the packing S1 is pressed between the valve lid 43 and the valve box 41 in the circumferential direction, it is possible to ensure sealing between the valve lid 43 and the valve box 41 (see the enlarged portion in FIG. 3). Note that, although the embodiment has been described in terms of an example in which the packing S1 is press-fitted into a groove provided on the valve lid 43 side, the present invention is not limited to this, and a groove may be provided on the valve box 41 side, and the packing S1 may be press-fitted into the groove.

[0023] In this embodiment, an example has been given of a form in which the unitized valve body 42, valve cover 43 and valve rod 44 are attached to the valve box 41 while being suspended by the hanging device C and wire W, but this is not limited to this. For example, a mounting stand may be placed near the valve box 41, and the valve body 42, valve cover 43 and valve rod 44 may be placed on the mounting stand and then attached to the valve box 41.

[0024] In this way, the working valve 4 is composed of the first divided body (approximately 4500 kg) composed of the valve box 41 and the second divided body (approximately 6000 kg) composed of the valve body 42, the valve cover 43, and the valve stem 44, and the working valve 4 is configured by assembling these in order to the branch part 2a of the housing 2. In other words, since the first divided body and the second divided body can be transported separately by the hoisting tool C and the wire W, the load on the crane can be distributed and reduced compared to the case where the working valve 4 is installed in the branch part 2a in an assembled state (working valve 4 with a total weight of 10500 kg), so the crane can be made smaller and the work space for installing the working valve 4 can be saved. In addition, since the load on the hoisting tool C and the wire W is also reduced, there is no need to prepare thick hoisting tool C and wire W, and the cost of the hoisting tool C and wire W used can be reduced.

[0025] Furthermore, as described below, when a hole saw such as cutter 52 in this embodiment is used as a means for cutting fluid pipe 1, the hole saw will have a larger diameter than the outer diameter of fluid pipe 1, and therefore the structure of working valve 4 will also be larger. However, even in such a case, the first and second divisional bodies can be transported separately by the lifting tool C and wire W, so the crane can be suitably miniaturized.

[0026] Here, from the viewpoint of workability, an example has been given in which the valve body 42, the valve cover 43 and the valve stem 44 are fixed to the valve box 41 in a unitized state. However, this is not limited to this. For example, the valve body 42, the valve cover 43 and the valve stem 44 may be attached to the valve box 41 separately in this order, thereby further distributing and reducing the load on the crane.

[0027] The working valve 4 is divided into a valve box 41 installed above the branching section 2a, and a valve body 42, a valve cover 43, and a valve stem 44 that bulge out laterally from the valve box 41. After the valve box 41 is fixed to the branching section 2a, the valve body 42, the valve cover 43, and the valve stem 44 are fixed to the valve box 41. Therefore, when the valve box 41 is installed in the branching section 2a, the load is not tilted due to the weight balance, and the installation of the valve box 41 in the branching section 2a is simplified. Similarly, when the valve body 42, the valve cover 43, and the valve stem 44 are connected to the valve box 41, the load is not tilted due to the weight balance, and the connection of the valve body 42, the valve cover 43, and the valve stem 44 to the valve box 41 is simplified. In addition, since it is not necessary to suspend the working valve 4 at multiple points in order to maintain the weight balance of the working valve 4, the working space required to install the working valve 4 can be suitably saved.

[0028] In addition, when connecting the valve body 42, valve cover 43 and valve rod 44 to the valve box 41, the valve body 42 is inserted into the opening 41a of the valve box 41, and the valve cover 43 is slid from the side until it abuts the valve box 41, thereby guided by the valve body 42 into the valve box 41, and the valve body 42, valve cover 43 and valve rod 44 can be positioned with high precision relative to the valve box 41.

[0029] In this embodiment, the valve cover 43 and the valve box 41 are fixed to each other with bolts and nuts, but this is not limited to this. For example, they may be fixed to each other by another fixing means such as a vice, or they may be fastened by welding or the like.

[0030] Next, a process of installing a cutting machine 5 for cutting the fluid pipe 1 above the working valve 4 will be described. As shown in Fig. 3, first, a mounting flange tube 51 (cylindrical body) penetrating in the vertical direction is suspended by a hoist C and a wire W and lowered to above the valve box 41, and the mounting flange tube 51 is fixed above the valve box 41 by bolts and nuts (not shown). The weight of the mounting flange tube 51 in this embodiment is approximately 2600 kg. An O-ring (not shown) is pressed between the mounting flange tube 51 and the valve box 41, so that the valve box 41 and the mounting flange tube 51 are connected in a hermetically sealed manner.

[0031] In this embodiment, even after the mounting flange tube 51 is placed on the valve box 41, the mounting flange tube 51 is connected to a crane (not shown) with the wire W slightly loosened to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the mounting flange tube 51. Also, to make it easier to adjust the position of the mounting flange tube 51, the position of the mounting flange tube 51 may be adjusted relative to the valve box 41 while the mounting flange tube 51 is slightly suspended by a crane.

[0032] Next, as shown in Fig. 4, the cutter 52 is temporarily installed on the mounting flange tube 51. More specifically, with the cover 53 of the mounting flange tube 51 connected to the upper part of the cutter 52, it is suspended by a hoist C and a wire W and lowered to above the mounting flange tube 51. 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 with the cylindrical member 52a and protruding beyond the boring blade, and the cylindrical member 52a and the center drill 52b are fixed. In addition, an adapter 54 having an annular protrusion 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.

[0033] The cover 53 has a through hole 53a formed in the center thereof penetrating in the vertical direction, and the adaptor 54 is inserted into the through hole 53a. The cover 53 has a plurality of recesses 53b formed in the circumferential direction, the recesses 53b being recessed in the outer diameter direction from the inner peripheral surface of the through hole 53a, 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 integrating the cutter 52 and the cover 53.

[0034] In this embodiment, the cutter 52 weighs approximately 2910 kg, the lid 53 weighs approximately 1900 kg, and the adapter 54 weighs approximately 290 kg, with the total weight being approximately 5100 kg.

[0035] 5, the mounting flange tube 51 and the lid body 53 are aligned with each other in a state where the lid body 53 is placed on the mounting flange tube 51, and then fixed with bolts and nuts (not shown). At this time, the cutter 52 is housed inside the mounting flange tube 51.

[0036] 5, the packing S2 is pressed between the mounting flange tube 51 and the lid body 53 in the circumferential direction, thereby ensuring a tight seal between the mounting flange tube 51 and the lid body 53. Note that, although the embodiment has been described in terms of an example in which the packing S2 is pressed into a groove provided on the lid body 53 side, the present invention is not limited to this, and a groove may be provided on the mounting flange tube 51 side, and the packing S2 may be pressed into the groove.

[0037] In this embodiment, even after the cover body 53 is placed on the mounting flange tube 51, the cover body 53 is connected to the crane with the wire W slightly loosened to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the cover body 53. Also, in order to make it easier to adjust the position of the mounting flange tube 51, the position of the mounting flange tube 51 may be adjusted relative to the valve box 41 while it is slightly suspended by the crane.

[0038] Next, the drive mechanism 8 (drive unit) of the cutting machine 5 is connected to the cutter 52. First, the structure of the drive mechanism 8 will be described with reference to FIG.

[0039] 6, the drive mechanism 8 is mainly composed of a shaft member 81, a gripping member 82 capable of gripping or releasing the grip of the shaft member 81, an advancing / retreating member 83 for moving the gripping member 82 forward and backward within the axial range of the shaft member 81, a restricting member 84 capable of restricting or releasing the movement of the shaft 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 restricting member 84 are attached. The weight of the drive mechanism 8 in this embodiment is approximately 6,060 kg.

[0040] The base member 85 is provided with a plurality of support pillars 85a standing upward, and the advancing / retreating member 83 is attached so as to be slidable up and down along the support pillars 85a. That is, the shaft member 81 is gripped by the gripping member 82, and in this state, the advancing / retreating member 83 is moved along the support pillars 85a, whereby the shaft member 81 can be slid up and down.

[0041] Further, a cylindrical case portion 86 into which the shaft member 81 can be inserted is provided below the base member 85. A packing S3 that seals between the inner peripheral surface of the case portion 86 and the outer peripheral surface of the shaft member 81 is provided on the inner peripheral surface of the case portion 86, and an annular groove 86a is formed in the lower surface of the case portion 86, and an annular packing S4 is press-fitted into the annular groove 86a.

[0042] 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.

[0043] 7, when connecting the drive mechanism 8 to the cutter 52, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 53c of the cover body 53, the shaft member 81 is advanced downward a predetermined length in advance until the lower end of the shaft member 81 protrudes downward beyond the case part 86, the drive mechanism 8 is suspended by the hoisting tool C and the wire W, and the case part 86 is placed on the jacks 7. Next, an operator accesses through a gap formed by the jacks 7 between the case part 86 and the upper flange 53c of the cover body 53, and connects the shaft member 81 to the adapter 54 with bolts and nuts N1.

[0044] In this embodiment, even after the drive mechanism 8 is placed on the jack 7, the drive mechanism 8 is connected to the crane with the wire W slightly loosened to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the drive mechanism 8. Also, in order to make it easier to adjust the position of the drive mechanism 8, the position of the shaft member 81 and the adapter 54 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0045] 8, the drive mechanism 8, the adapter 54, and the cutter 52 are lifted slightly upward by a crane, the jack 7 is removed from between the case 86 and the cover 53, and the fixture 55 is retracted into the recess 53b. At this time, the cutter 52 (approximately 2910 kg), the adapter 54 (approximately 290 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the crane, so the weight on the crane is approximately 9260 kg. At this time, a plurality of jacks 7 (spacers) may be arranged in the circumferential direction of the lower flange 53d of the cover 53, and the drive mechanism 8 may be placed on the jacks 7 to support the weight, thereby reducing the weight on the crane.

[0046] 9, the drive mechanism 8 is lowered by a crane so that the case portion 86 is placed on the upper flange 53c of the cover 53, and the case portion 86 and the cover 53 are fixed with bolts and nuts (not shown). As a result, the mounting flange tube 51, cutter 52, cover 53, adapter 54 and drive mechanism 8 constitute the cutting machine 5, and the housing 2, working valve 4 and cutter 5 constitute the cutting device. 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.

[0047] Furthermore, when the case portion 86 and the lid body 53 are fixed together, the packing S4 is pressed between the case portion 86 and the upper flange 53c of the lid body 53, thereby ensuring a tight seal between the case portion 86 and the lid body 53. Note that, although the present embodiment has been described with reference to an embodiment in which the packing S4 is press-fitted into the annular groove 86a formed in the lower surface of the case portion 86, the present invention is not limited to this, and an annular groove may be provided on the upper flange 53c side of the lid body 53, and the packing S4 may be press-fitted into the annular groove.

[0048] In this embodiment, even after the case part 86 is placed on the lid body 53, the wire W is connected to the drive mechanism 8 with the crane in a slightly loose state to ensure safety, but this is not limited thereto, and the hoisting tool C and the wire W may be removed from the drive mechanism 8. Also, in order to make it easier to adjust the position of the drive mechanism 8, the position of the case part 86 and the lid body 53 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0049] Next, a process of cutting the fluid pipe 1 by the cutting machine 5 will be described. As shown in Fig. 10, first, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the outer circumferential surface of the rear end side of the shaft member 81 is gripped by the above-mentioned gripping member 82. Next, the rotary motor 87 is driven to rotate the shaft member 81 and the cutter 52. Then, with the shaft member 81 and the cutter 52 rotated, the advancing and retracting member 83 is advanced toward the fluid pipe 1. As a result, first, the center drill 52b of the cutter 52 drills the pipe wall of the fluid pipe 1.

[0050] The movement of the shaft member 81 and the cutter 52 is performed in a range from the position where the gripping member 82 grips the shaft member 81 to a position close to the regulating member 84, the shaft member 81 slides against the packing S3 and is moved forward, and the movement of the shaft member 81 and the cutter 52 after the movement is completed is regulated by the regulating member 84. Thereafter, the rotation of the shaft member 81 by the rotary motor 87 is stopped, another shaft member 81' is connected to the upper end of the shaft member 81, and the above process is repeated, whereby the cylindrical member 52a of the cutter 52 cuts the fluid pipe 1. At this time, another shaft member 81' is not necessarily connected, and the cutting may be completed using a shaft member 81 of a predetermined length in advance.

[0051] 11, when the fluid pipe 1 is cut by the cutter 52, the piece 1a formed by cutting the fluid pipe 1 is held within the cylindrical member 52a. Then, by moving the shaft member 81 and the cutter 52 backward in the reverse order of the above steps, the piece 1a is pulled up into the inside of the mounting flange tube 51, and the branch portion 2a is closed by the valve body 42 of the working valve 4, thereby completing the cutting operation of the fluid pipe 1.

[0052] As described above, the housing 2 is attached to the fluid pipe 1 in a hermetically sealed manner, and the working valve 4 is attached to the branching portion 2a of the housing 2, and then the cutter 52, the lid 53, and the adapter 54 are installed in a unitized state on the working valve 4, and the drive mechanism 8 is attached to the cutter 52, the lid 53, and the adapter 54 installed on the working valve 4 to configure the cutting machine 5. According to this, since the cutter 52, the lid 53, and the adapter 54 (approximately 5100 kg) in the cutting machine 5 and the drive mechanism 8 (approximately 6060 kg) can be transported separately, the load on the crane can be distributed and reduced compared to the case where the cutting machine 5 is installed on the working valve 4 in an assembled state (approximately 11160 kg), so that the crane can be made smaller and the work space required to install the cutting machine 5 can be saved.

[0053] In particular, when using a hole saw such as cutter 52 as in this embodiment, a cylindrical member 52a with a larger diameter than at least the fluid pipe 1 is required, and the configuration of the cutting machine 5 also becomes larger. However, even in such a case, since the cutter 52, the cover body 53, and the adapter 54 are installed separately from the drive mechanism 8, the load on the crane can be distributed and the crane can be suitably made smaller.

[0054] Here, from the viewpoint of workability, an example has been given in which the cutter 52, the lid 53, and the adapter 54 are fixed to the mounting flange tube 51 as a unit, but this is not limiting, and for example, the cutter 52, the lid 53, and the adapter 54 may be attached separately and in order to the mounting flange tube 51 to further distribute and reduce the load on the crane. In this case, a holding means for holding the cutter 52 inside the mounting flange tube 51 may be prepared.

[0055] Also, a mounting flange tube 51 (approximately 2600 kg) capable of accommodating the cutter 52 is installed on the working valve 4, and the cutter 52, cover body 53, and adapter 54 are installed on the mounting flange tube 51, so that the cutter 52 is inserted while being guided by the mounting flange tube 51, and the cutter 52 can be positioned and installed with high accuracy on the fluid pipe 1. Also, the load on the crane can be reduced compared to when the cutter 52, cover body 53, adapter 54, and mounting flange tube 51 are installed on the working valve 4 as a unit (approximately 7700 kg).

[0056] Furthermore, since the cutter 52 is housed in the mounting flange tube 51 with the cutter 52 and the lid 53 connected by the fixing jig 55 and the lid 53 and the mounting flange tube 51 are fixed, the cutter 52 can be held by using the lid 53 that hermetically closes the mounting flange tube 51. This makes it unnecessary to prepare a special jig for holding the cutter 52 separately from the lid 53, and the structure can be simplified.

[0057] In addition, in a state where the case part 86 of the drive mechanism 8 is separated from the lid body 53, the cutter 52 (adapter 54) and the shaft member 81 of the drive mechanism 8 are connected via the through hole 53a of the lid body 53, and then the case part 86 is connected to the lid body 53 in a sealed manner. According to this, the cutter 52 and the shaft member 81 can be connected through the gap between the case part 86 of the drive mechanism 8 and the lid body 53, so that it is not necessary to form a working hole or the like for connecting the cutter 52 and the shaft member 81 in the case part 86 or the lid body 53, and the structure can be simplified. In addition, since the case part 86 and the lid body 53 are connected after the cutter 52 and the shaft member 81 are connected, the case part 86 and the lid body 53 are guided by the adapter 54 and the shaft member 81, and the connection work can be performed in a stable state.

[0058] Furthermore, with the jack 7 disposed between the case part 86 and the lid body 53 as a spacer, an operator can access through a gap formed by the jack 7 between the case part 86 and the upper flange 53c of the lid body 53 to connect the shaft member 81 and the adapter 54 with the bolts and nuts N1, which prevents the drive mechanism 8 from falling when connecting the shaft member 81 and the adapter 54, thereby improving safety. Furthermore, by placing the case part 86 on the jack 7, the case part 86 is more stable than when it is suspended by the hoisting tool C and wire W, making it easier to connect the shaft member 81 and the adapter 54.

[0059] Although not shown, with the branch section 2a kept closed by the valve body 42 of the work valve 4, first the drive mechanism 8 is removed from the cover 53, then the cover 53 and the cutter 52 together with the piece 1a are removed from the mounting flange tube 51, and the mounting flange tube 51 is removed from the work valve 4, completing the removal of the cutting machine 5. In this way, each member constituting the cutting machine 5 can be transported separately by crane, thereby reducing the load on the crane during the removal of the cutting machine 5.

[0060] Next, a process of installing a valve introducer 6 for installing a butterfly valve 10 at a location where the fluid pipe 1 is cut will be described. As shown in FIG. 12, first, while the branch portion 2a is closed by the valve body 42 of the working valve 4, a cylindrical member 61 (cylindrical body) penetrating in the vertical direction is suspended by a suspender C and a wire W and lowered to above the working valve 4, and the cylindrical member 61 is fixed above the working valve 4 by bolts and nuts (not shown). The weight of the cylindrical member 61 in this embodiment is approximately 3000 kg. In addition, an O-ring (not shown) is pressed between the cylindrical member 61 and the working valve 4 (valve box 41), so that the cylindrical member 61 and the working valve 4 are connected in a hermetically sealed manner.

[0061] In this embodiment, even after the cylindrical member 61 is placed on the working valve 4, the wire W is connected to the cylindrical member 61 in a slightly loosened state in order to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the cylindrical member 61. Also, in order to make it easier to adjust the position of the cylindrical member 61, the position of the valve box 41 and the cylindrical member 61 may be adjusted while the cylindrical member 61 is slightly suspended by the crane.

[0062] Next, there will be described a process for temporarily installing the butterfly valve 10 in the cylindrical member 61. First, the structure of the butterfly valve 10 will be described with reference to FIG.

[0063] As shown in Fig. 14, the butterfly valve 10 controls the flow path of the fluid pipe 1 between a state in which the fluid can pass and a state in which the fluid cannot pass, and includes a partition wall 11 having an opening at approximately the center, an opening / closing shaft 12 rotatably attached to the upper end of the partition wall 11, a valve body 13 that can open and close the opening of the partition wall 11 by rotating around the opening / closing shaft 12, and a substantially circular upper cover part 14 (cover part) that extends in a substantially horizontal direction and is connected in a sealed manner to the upper end of the partition wall 11. A packing S5 is fixed to both side surfaces and the bottom surface of the partition wall 11, and a packing S6 is fixed to the upper cover part 14 around the entire outer periphery of its outer periphery, and the packings S5 and S6 are connected so as to be continuous. The total weight of the butterfly valve 10 in this embodiment is approximately 9540 kg. Needless to say, the gap between the partition wall 11 and the upper cover part 14 is sealed with a packing or the like.

[0064] 13, when temporarily installing the butterfly valve 10 in the cylindrical member 61, first, the partition wall 11, the opening / closing shaft 12, and the valve body 13 (main body) are suspended in an integrated state by a suspender C and a wire W and lowered to a position where they will be housed in the cylindrical member 61. At this time, the valve body 13 is positioned so as to be approximately parallel to the pipe axis direction (with the opening of the partition wall 11 open).

[0065] Then, a locking member 62 (locking portion, holding portion) is inserted from the outside through a plurality of windows 61a formed in the circumferential direction of the cylindrical member 61 so as to partially protrude into the cylindrical member 61. As a result, the protruding piece 11a protruding outward from the partition wall 11 is placed (locked) on the tip portion of the locking member 62, and the partition wall 11, the opening / closing shaft 12, and the valve body 13 are held by the cylindrical member 61. Note that a recess 62a capable of accommodating a portion of the valve body 13 is formed in the lower portion on the tip side of the locking member 62, so that the locking member 62 and the valve body 13 do not interfere with each other.

[0066] 14, the upper cover 14 is suspended by a suspender C and a wire W and placed on the upper part of the partition wall 11 with the opening / closing shaft 12 inserted therethrough. The upper cover 14 and the partition wall 11 are then connected in a hermetic manner by a fixing means (not shown) to form the butterfly valve 10.

[0067] In this embodiment, even after the top cover part 14 is placed on the partition wall 11, the wire W is connected to the top cover part 14 in a slightly loosened state in order to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the top cover part 14. Also, in order to make it easier to adjust the position of the top cover part 14, the position of the top cover part 14 relative to the partition wall 11, the opening / closing shaft 12, and the valve body 13 may be adjusted while the top cover part 14 is slightly suspended by the crane.

[0068] Furthermore, in this embodiment, the butterfly valve 10 is constructed on the cylindrical member 61 by fixing the upper cover 14 to the integrated partition wall 11, opening / closing shaft 12, and valve body 13, but the butterfly valve 10 may be constructed by separately installing the partition wall 11, opening / closing shaft 12, valve body 13, and upper cover 14 in order. Also, the partition wall 11 and valve body 13 may be integrated, the opening / closing shaft 12 and upper cover 14 may be integrated, and the butterfly valve 10 may be constructed by assembling them. In other words, as long as at least the upper cover 14 is separated from the other members (main body) and the butterfly valve 10 is constructed by assembling them, any configuration can be used.

[0069] 15, the mounting flange tube 63 penetrating in the vertical direction is suspended by a hoist C and a wire W and lowered to above the cylindrical member 61, and the mounting flange tube 63 is fixed to the above the cylindrical member 61 by bolts and nuts (not shown). The weight of the mounting flange tube 63 in this embodiment is approximately 2600 kg.

[0070] In this embodiment, even after the cylindrical mounting flange 63 is placed on the cylindrical member 61, the cylindrical mounting flange 63 is connected to the crane with the wire W slightly loosened to ensure safety, but this is not limited to the above, and the hoisting tool C and the wire W may be removed from the cylindrical mounting flange 63. Also, in order to make it easier to adjust the position of the cylindrical mounting flange 63, the position of the cylindrical mounting flange 63 and the cylindrical member 61 may be adjusted while the cylindrical mounting flange 63 is slightly suspended by a crane.

[0071] 15, an annular groove 63a is formed on the bottom surface of the mounting flange tube 63, and an annular packing S7 is press-fitted into the annular groove 63a. When the cylindrical member 61 and the mounting flange tube 63 are fixed, the packing S7 is pressed between the cylindrical member 61 and the mounting flange tube 63, so that the sealing performance between the cylindrical member 61 and the mounting flange tube 63 can be ensured. Note that, in this embodiment, the packing S7 is press-fitted into the annular groove 63a formed on the bottom surface of the mounting flange tube 63, but this is not limiting, and an annular groove may be provided on the cylindrical member 61 side, and the packing S7 may be press-fitted into the annular groove.

[0072] Next, as shown in Fig. 16, a valve hanging fitting 64 connected to the butterfly valve 10 is temporarily installed on the mounting flange tube 63. More specifically, with the cover 65 of the mounting flange tube 63 connected to the upper part of the valve hanging fitting 64, it is suspended by a hanging tool C and a wire W and lowered to the upper part of the mounting flange tube 63. The valve hanging fitting 64 has a mounting surface portion 64a facing substantially horizontally, a cylindrical shaft portion 64c extending upward from a through hole 64b provided at substantially the center of the mounting surface portion 64a, and a reinforcing rib 64d provided between the mounting surface portion 64a and the shaft portion 64c. An adapter 66 is connected to the upper end of the shaft portion 64c.

[0073] The lid 65 has a through hole 65a formed in the center penetrating in the up-down direction, and an adapter 66 is inserted into the through hole 65a. The lid 65 has a plurality of recesses 65b formed in the circumferential direction, recessed in the outer diameter direction from the inner peripheral surface of the through hole 65a, and a fixing jig 67 that can advance and retreat in the radial direction of the through hole 65a is disposed in the recesses 65b. The fixing jig 67 protrudes in the inner diameter direction of the through hole 65a and engages with the underside of the annular protrusion 66a of the adapter 66, thereby integrating the valve hanging fitting 64 and the lid 65.

[0074] In this embodiment, the weight of the valve hanging fitting 64 is approximately 2000 kg, the weight of the cover body 65 is approximately 1900 kg, and the weight of the adapter 66 is approximately 270 kg, with the total weight of these being approximately 4170 kg.

[0075] 17, the mounting flange tube 63 and the lid body 65 are aligned with each other in a state where the lid body 65 is placed on the upper end of the mounting flange tube 63, and then fixed with bolts and nuts (not shown). In this embodiment, even after the lid body 65 is placed on the mounting flange tube 63, the lid body 65 is connected to the crane with the wire W slightly loosened in order to ensure safety, but this is not limited to this, and the hoisting tool C and the wire W may be removed from the lid body 65. Also, in order to make it easier to adjust the position of the lid body 65, the position of the mounting flange tube 63 and the lid body 65 may be adjusted with the lid body 65 slightly suspended by the crane.

[0076] 17, the packing S8 is pressed between the mounting flange tube 63 and the lid body 65 in the circumferential direction, thereby ensuring a tight seal between the mounting flange tube 63 and the lid body 65. Note that, in this embodiment, the form in which the packing S8 is pressed into the groove provided on the lid body 65 side has been exemplified, but this is not limiting, and a groove may be provided on the mounting flange tube 63 side, and the packing S8 may be pressed into the groove.

[0077] Next, the drive mechanism 8 serving as the insertion mechanism of the valve introducer 6 is connected to the valve hanging fixture 64. Note that the drive mechanism 8 is the same as that used during the cutting operation of the fluid pipe 1, and therefore a description of the structure of the drive mechanism 8 will be omitted.

[0078] 18, when connecting the drive mechanism 8 to the valve hanging fitting 64, the shaft member 81 is advanced downward in advance by a predetermined length so that the lower end of the shaft member 81 protrudes downward beyond the case portion 86, and multiple jacks 7 (spacers) are placed in the circumferential direction of the upper flange 65c of the cover body 65, the drive mechanism 8 is suspended by a crane, and the case portion 86 is placed on the jacks 7. Next, an operator accesses through a gap formed by the jacks 7 between the case portion 86 and the upper flange 65c of the cover body 65, and connects the shaft member 81 and the adapter 66 with bolts and nuts N2.

[0079] 19, the drive mechanism 8, the adapter 66, and the valve hoisting fitting 64 are lifted slightly upward by the crane, the jack 7 is removed from between the case 86 and the cover 65, and the fixture 55 is retracted into the recess 53b. At this time, the valve hoisting fitting 64 (approximately 2000 kg), the adapter 66 (approximately 270 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the hoisting tool C and the wire W, so that the weight applied to the hoisting tool C and the wire W is approximately 8330 kg. At this time, a plurality of jacks 7 (spacers) may be arranged in the circumferential direction of the lower flange 65d of the cover 65, and the drive mechanism 8 may be placed on the jacks 7 to receive the weight, thereby reducing the weight applied to the crane.

[0080] Next, although not shown, the drive mechanism 8 is lowered by the hoist C and wire W so that the case part 86 is placed on the upper flange 65c of the lid body 65, and the case part 86 and the lid body 65 are fixed with bolts and nuts (not shown). When the case part 86 and the lid body 65 are fixed, the packing S4 is pressed between the case part 86 and the upper flange 65c of the lid body 65, so that the sealing between the case part 86 and the lid body 65 can be ensured. Note that, although the embodiment has been exemplified by a form in which the packing S4 is disposed on the lower surface of the case part 86, the present invention is not limited to this, and an annular groove may be provided on the upper flange 65c side of the lid body 65, and the packing S4 may be press-fitted into the annular groove.

[0081] In this embodiment, even after the case part 86 is placed on the lid body 65, the wire W is connected to the drive mechanism 8 with the crane in a slightly loose state to ensure safety, but this is not limited thereto, and the hoisting tool C and the wire W may be removed from the drive mechanism 8. Also, in order to make it easier to adjust the position of the drive mechanism 8, the position of the case part 86 and the lid body 65 may be adjusted while the drive mechanism 8 is slightly suspended by the crane.

[0082] 20, the valve hanger 64 is lowered by the drive mechanism 8, and the mounting surface 64a of the valve hanger 64 and the upper cover 14 of the butterfly valve 10 are connected with bolts and nuts (not shown). As a result, the cylindrical member 61, mounting flange tube 63, valve hanger 64, cover 65, adapter 66 and drive mechanism 8 constitute the valve introduction device 6, and the housing 2, working valve 4 and valve introduction device 6 constitute a valve installation device. At this time, the opening / closing shaft 12 of the butterfly valve 10 is inserted into the shaft portion 64c of the valve hanger 64.

[0083] Thereafter, the valve hanging fitting 64 and the butterfly valve 10 are lifted slightly upward by the drive mechanism 8, and the locking member 62 is retracted to pull it out of the window 61a of the cylindrical member 61. Although not shown, the window 61a is plugged to hermetically close it. At this time, it goes without saying that the lower end of the butterfly valve 10 is adjusted so as not to come into contact with the valve body 42.

[0084] Next, a process of installing the butterfly valve 10 at the portion of the fluid pipe 1 cut by the valve introducer 6 will be described. As shown in Fig. 21, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the outer circumferential surface of the rear end side of the shaft member 81 is gripped by the gripping member 82 described above. Then, the advancing and retracting member 83 is slid toward the fluid pipe 1, thereby advancing the shaft member 81 and the butterfly valve 10 toward the fluid pipe 1.

[0085] The forward movement of the shaft member 81 and the butterfly valve 10 occurs in a range from the position where the gripping member 82 grips the shaft member 81 to a position close to the restricting member 84, and after the forward movement is completed, the movement of the shaft member 81 and the butterfly valve 10 is restricted by the restricting member 84. Thereafter, another shaft member 81', 81' is connected to the upper end of the shaft member 81, and the above process is repeated to place the butterfly valve 10 at the cut portion of the fluid pipe 1. After the butterfly valve 10 is placed at the cut portion of the fluid pipe 1, the butterfly valve 10 is fixed to the housing 2 by a predetermined fixing means. At this time, another shaft member 81' is not necessarily connected, and the placement may be completed using a shaft member 81 of a predetermined length in advance.

[0086] Furthermore, when the butterfly valve 10 is fixed to the housing 2, the gasket S5 of the partition wall 11 is pressed against both inner surfaces and the inner bottom surface of the housing 2, and the gasket S6 of the top cover portion 14 is pressed against the inner surface of the branch portion 2a, thereby preventing the fluid flowing through the fluid pipe 1 from leaking around between the partition wall 11 and the housing 2 and preventing the fluid from leaking from the branch portion 2a.

[0087] 22, the fluid within the cylindrical member 61 and the mounting flange tube 63 is discharged to the outside, and the mounting surface 64a of the valve hanging fitting 64 and the top cover 14 of the butterfly valve 10 are released with the bolt and nut by accessing the working hole 61b of the cylindrical member 61. Then, the shaft member 81 is moved backward in the reverse order of the above steps, and the valve hanging fitting 64 is pulled up into the cylindrical member 61 and the mounting flange tube 63, completing the installation of the butterfly valve 10 at the cut portion of the fluid pipe 1.

[0088] Although not shown, first, the drive mechanism 8 is removed from the cover 65, the cover 65 and the valve hanging fitting 64 are removed from the mounting flange tube 63, the mounting flange tube 63 is removed from the cylindrical member 61, and the cylindrical member 61 is removed from the working valve 4, thereby completing the removal work of the valve introducing device 6. In this way, each member constituting the valve introducing device 6 can be transported separately by a crane, so that the load on the crane during the removal work of the valve introducing device 6 can be reduced. Thereafter, the working valve 4 is removed from the branching portion 2a of the housing 2, thereby completing a series of operations up to cutting a predetermined portion of the fluid pipe 1 and installing the butterfly valve 10 at the cut portion.

[0089] In this manner, the butterfly valve 10 is constructed by installing the partition wall 11, the opening / closing shaft 12, and the valve body 13 on the working valve 4, and attaching the top cover 14 to the partition wall 11, the opening / closing shaft 12, and the valve body 13 installed on the working valve 4. With this, the partition wall 11, the opening / closing shaft 12, and the valve body 13, which are the main body of the butterfly valve 10, and the top cover 14, which is the cover body, can be transported separately, so that the load on the crane can be distributed and reduced compared to the case where the butterfly valve 10 is installed on the cylindrical member 61 in an assembled state (approximately 9,540 kg), and therefore the crane can be made smaller, and the work space for installing the butterfly valve 10 can be saved.

[0090] When using a hole saw such as cutter 52 as in this embodiment, a cylindrical member 52a with a diameter at least larger than the fluid pipe 1 is required, and therefore the configuration of the housing 2 also becomes larger, which in turn increases the size of the butterfly valve 10, and in particular the top cover 14 for blocking the branch section 2a. However, even in such a case, the partition wall 11, opening / closing shaft 12, and valve body 13 are installed separately from the top cover 14, so that the load on the crane can be distributed and the crane can be suitably made smaller.

[0091] In addition, a cylindrical member 61 (approximately 3,000 kg) capable of accommodating the butterfly valve 10 is installed on the operating valve 4, and the partition wall 11, opening / closing shaft 12 and valve body 13 are installed inside the cylindrical member 61.The upper cover portion 14 is then attached to the partition wall 11, opening / closing shaft 12 and valve body 13 installed on the cylindrical member 61.Therefore, the butterfly valve 10 can be positioned and installed with high precision using the cylindrical member 61 installed on the operating valve 4.

[0092] Further, a locking member 62 can be attached to the cylindrical member 61, and the upper cover portion 14 can be attached with high precision in a stable state in which the partition wall 11, the opening / closing shaft 12 and the valve body 13 are locked to the locking member 62.

[0093] In addition, since the drive mechanism 8 and the valve hanging bracket 64 (insertion machine) are connected to the butterfly valve 10 while the butterfly valve 10 is held by the locking member 62, the drive mechanism 8 and the valve hanging bracket 64 can be precisely attached to the butterfly valve 10 while the butterfly valve 10 is in a stabilized state, and the drive mechanism 8 and the valve hanging bracket 64 enable the butterfly valve 10 to be installed in the desired position within the housing 2.

[0094] Furthermore, since the valve introduction device 6 is constructed by connecting the drive mechanism 8 and the valve suspension fitting 64 after the butterfly valve 10 is constructed, the load on the crane can be reduced compared to installing the butterfly valve 10, drive mechanism 8, and valve suspension fitting 64 in an integrated assembled state on the working valve 4.

[0095] Furthermore, a jack 7 is placed as a spacer between the drive mechanism 8 and the valve hanging fitting 64, and the butterfly valve 10, specifically between the case 86 of the drive mechanism 8 and the lid 65, and the mounting surface 64a of the valve hanging fitting 64 connected to the drive mechanism 8 placed on the jack 7 is connected to the upper lid 14 of the butterfly valve 10. With this, the drive mechanism 8 and the valve hanging fitting 64 can be connected to the butterfly valve 10 with their loads resting on the jack 7, which not only makes the connection work easier but also reduces the load on the crane.

[0096] As described above, the working valve 4, the cutter 5, and the butterfly valve 10 are each composed of a plurality of divided bodies, and after the housing 2 is hermetically attached to the fluid pipe 1, the divided bodies are assembled to the housing 2 in order. Specifically, the working valve 4 is divided into a valve box 41, a valve body 42, a valve cover 43, and a valve stem 44, and the working valve 4 is formed by assembling these in order to the housing 2. The cutter 5 is divided into a mounting flange tube 51, a cutter 52, a cover body 53, and a drive mechanism 8, and the cutting machine 5 is formed by assembling these in order to the working valve 4 connected to the housing 2. The butterfly valve 10 is divided into a partition wall 11, an opening / closing shaft 12, a valve body 13, and an upper cover portion 14, and the butterfly valve 10 is formed by assembling these in order to the working valve 4 connected to the housing 2. According to this, the multiple divided bodies constituting the working valve 4, the cutting machine 5, and the butterfly valve 10 can be transported separately by a crane, thereby reducing the load on the crane and making the crane smaller.

[0097] Also, a first divided body among the plurality of divided bodies is locked to a locking portion provided on the housing 2, and the remaining second divided body is assembled to the first divided body locked to the locking portion. Specifically, in the case of the working valve 4, the valve box 41, which is the first divided body, is placed (locked) on the branch portion 2a (locking portion) of the housing 2, and the valve body 42 and the valve cover 43, which are the second divided body, are assembled to the valve box 41. In the case of the cutting machine 5, the cutter 52, which is the first divided body, is locked to a fixing jig 55 (locking portion) provided on a cover body 53 of a mounting flange tube 51 connected to the housing 2 via the working valve 4, and the drive mechanism 8, which is the second divided body, is assembled to the cutter 52. In the case of the butterfly valve 10, the partition wall 11, which is the first divided body, is engaged with a locking member 62 (locking portion) provided on a cylindrical member 61 connected to the housing 2 via the working valve 4, and the top cover portion 14, which is the second divided body, is assembled to the partition wall 11. This allows the remaining second divided body (valve body 42 and valve cover 43, drive mechanism 8, top cover portion 14) to be attached with high precision to the first divided body in a stable state in which the first divided body (valve box 41, cutter 52, partition wall 11) of the multiple divided bodies is engaged with the locking portion (branch portion 2a, fixing jig 55, locking member 62) of the housing 2.

[0098] Moreover, the cutting machine 5 is composed of cutters 52 and a drive mechanism 8 as the multiple divided bodies, and the drive mechanism 8 is connected so that the butterfly valve 10 can be inserted into the housing 2. That is, since the cutters 52 and the drive mechanism 8 constituting the cutting machine 5 are separated, the drive mechanism 8 for driving the cutters 52 can be used as an insertion tool for the butterfly valve 10. In other words, the drive mechanism 8 can be used both for driving and moving the cutters 52 back and forth and for inserting the butterfly valve 10, which simplifies the structure.

[0099] In this embodiment, the working valve 4, the cutting machine 5, and the butterfly valve 10 are each configured with a plurality of divided bodies, but the present invention is not limited to this, and it is sufficient that at least one of the working valve 4, the cutting machine 5, and the butterfly valve 10 is configured with a plurality of divided bodies. It goes without saying that when cutting or introducing a valve in an uninterrupted flow state, covers are attached to all windows and working holes in a sealed manner.

[0100] Next, the working valve of the first modified example will be described with reference to Fig. 23. Note that the description of the same configuration as in the above embodiment will be omitted.

[0101] As shown in FIG. 23, the operating valve 400 in the first modified example is composed of a valve box 401 having a generally cylindrical shape penetrating in the vertical direction, valve elements 402A, 402B arranged on both sides of the valve box 401 in the axial direction of the fluid pipe 1, valve covers 403A, 403B that house the valve elements 402A, 402B, and valve stems 404A, 404B that move the valve elements 402A, 402B relative to the valve covers 403A, 403B.

[0102] The valve box 401 is provided with openings 401a and 401b facing each other in the axial direction of the fluid pipe 1, and a slide groove 401c is formed to communicate the openings 401a and 401b. With valve bodies 402A and 402B inserted into the openings 401a and 401b, respectively, the valve covers 403A and 403B are fixed to the valve box 401 in a sealed state to form the working valve 400. By advancing the valve bodies 402A and 402B from both sides of the valve box 401, the tips of the valve bodies 402A and 402B come into contact with each other, thereby blocking the branch section 2a of the housing 2.

[0103] In this way, the valve bodies 402A, 402B, valve covers 403A, 403B, and valve stems 404A, 404B have a separate structure and are installed in order and separately, thereby reducing the load on a crane used to install the operating valve 400. Furthermore, the valve box 401 has openings 401a, 401b on both opposing sides, and the valve bodies 402A, 402B, valve covers 403A, 403B, and valve stems 404A, 404B are attached to the openings 401a, 401b, so that the weight balance of the operating valve 400 can be stabilized and the application of an unbalanced load to the connection points between the operating valve 400 and the housing 2 can be suppressed.

[0104] Next, the working valve of the second modification will be described with reference to FIG. 24. As shown in FIG. 24, the working valve 410 may be configured by assembling the first divided body 412 and the second divided body 413 on the branching part 2a of the housing 2, and may be configured to include a half-split member 411A (a divided body of the valve box), a valve disc 402A, a valve cover 403A, and a valve stem 404A as a unit, and a half-split member 411B (a divided body of the valve box), a valve disc 402B, a valve cover 403B, and a valve stem 404B as a unit. The working valve 410 may be configured by assembling each member on the branching part 2a of the housing 2. In this case, the valve box is configured by a plurality of half-split members 411A and 411B, and the load on the crane can be reduced.

[0105] In the above embodiment, the cutter 52 is a hole saw composed of a cylindrical member 52a and a center drill 52b, but the present invention is not limited to this and can be freely modified. For example, as shown in Fig. 25, a cutting machine 500 in a third modification is composed of a cutter mechanism 501 fitted onto a predetermined portion of the fluid pipe 1 in the housing 20, a work case 502 attached above the work valve 402, and a drive mechanism 800 that drives the cutter mechanism 501 and can be raised into the work case 502.

[0106] The cutter mechanism 501 includes two sprockets 501a, 501a rotatably provided in the outer circumferential direction of the fluid pipe 1, and a drive transmission unit 501b that transmits a drive force to the sprockets 501a, 501a, and a cutting tool (not shown) that cuts the fluid pipe 1 is attached to the sprockets 501a, 501a. The drive mechanism 800 also includes a rod 801 connected to the drive transmission unit 501b, a motor 802 that drives and rotates the rod 801, and a lifting mechanism 803 that can lift up the rod 801.

[0107] By driving the motor 802, the sprockets 501a, 501a rotate via the rod 801 and the drive transmission unit 501b, and the fluid pipe 1 can be cut. In addition, the cutter mechanism 501 can be pulled up into the work case 502 by the lifting mechanism 803 while the sprockets 501a, 501a are holding the cut piece of the fluid pipe 1.

[0108] There is also the following modified example of the cutting machine. As shown in Fig. 26, a cutting machine 510 in modified example 4 includes a cylindrical body 511 fixed above the branching portion 200a of the housing 200 via an operating valve 403, a base plate 512 connected to an upper portion of the cylindrical body 511, a movable plate 513 provided so as to be movable relative to the base plate 512, a driving means 514 for applying a driving force to the movable plate 513, an end mill 515 connected to an upper portion of the movable plate 513, a driving mechanism 516 for rotating the end mill 515, and a rotation mechanism 523 for rotating the housing 200 in the circumferential direction.

[0109] A slit 512a is formed in the center of the base plate 512, and rails 517, 517 extending along the axial direction of the fluid pipe 1 are arranged in parallel on the upper surface of the base plate 512, sandwiching the slit 512a. A packing is fixed around the periphery of the slit 512a.

[0110] The movable plate 513 has a slit 513a and recesses 518, 518 fitted into the rails 517, 517, and is slidable on the rails 517, 517. The movable plate 513 is formed with a structural portion 520 having a screw hole 519 protruding upward. The movable plate 513 is slidable while being in sealed contact with the packing of the slit 512a in the base plate 512.

[0111] The driving means 514 includes two standing pieces 521, 521 spaced apart in the pipe axial direction on the upper surface of the base plate 512, and a threaded rod 522 rotatably attached between the standing pieces 521, 521 so as to be immovable in the axial direction, and the threaded rod 522 is screwed into a threaded hole 519 of a structural part 520 in the movable plate 513. That is, the threaded rod 522 rotates about its axis, causing the movable plate 513 to slide in the pipe axial direction of the fluid pipe 1. A handle 522a is attached to one end of the threaded rod 522, and the threaded rod 522 can be rotated by gripping the handle 522a.

[0112] According to this, the end mill 515 can be advanced while being rotated by the driving mechanism 516 to perforate the fluid pipe 1, and in this state, the movable plate 513 can be slid in the axial direction of the fluid pipe 1 to form a first cutting portion (not shown) extending in the axial direction of the fluid pipe 1. After the first cutting portion is formed, the end mill 515 can be positioned in the axial center of the first cutting portion, and the housing 200 can be rotated by the rotation mechanism 523 to form a second cutting portion extending along the circumferential direction of the fluid pipe 1.

[0113] That is, by inserting the valve body 13 through the first cut-out portion and the partition wall 11 through the second cut-out portion, the butterfly valve 10 can be installed in the fluid pipe 1 with the valve body 13 open, thereby suppressing the influence of the fluid flowing through the fluid pipe 1. In this way, the fluid pipe 1 is not limited to being cut, so long as it is possible to form an opening through which at least a fluid control device such as the butterfly valve 10 can be inserted and installed.

[0114] 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.

[0115] For example, in the above embodiment, a configuration in which the butterfly valve 10 is used as the fluid control valve is exemplified, but the present invention is not limited to this, and for example, the fluid control valve may be a gate valve, a plug, a switching valve, etc. For example, in the above embodiment, a configuration in which the butterfly valve 10 is composed of a plurality of divided bodies is exemplified, but the present invention is not limited to this, and the fluid control valve may be composed as an integral unit. [Explanation of symbols]

[0116] 1 Fluid tube 2. Chassis 2a Branching section (opening) 2b Flange (locking part) 4 Working valve 5 cutting machine 6 Valve introduction machine 7 Jack (spacer) 8 Drive mechanism (drive unit, inserter, second divided body) 10 Butterfly valve (fluid control) 11 Partition wall (main body, first divided body) 12 Opening / closing shaft (main body, first divided body) 13 Valve body (main body, first divided body) 14 Upper lid portion (lid body portion, second divided body) 20. Cabinet 41 Valve box (first division) 41c Valve seat part 42 Valve body (second divided body) 43 Opercle (second segment) 44 Valve stem (second divided body) 51 Mounting flange tube (cylindrical body) 52 Cutter (first divided body) 53 Lid body (first divided body) 54 Adapter (first division) 55 Fixture (locking part) 61 Cylindrical member (tubular body) 62 Locking member (locking part) 63 Mounting flange tube (cylindrical body) 64 Valve Hanging Fittings 65 Lid 66 Adapter 81, 81' Shaft member (drive shaft) 86 Case part (case) 200 units 200a Branching part (opening) 400 Working valve 401 Valve box (first division) 402 Working valve 402A, 402B Valve body (second divided body) 403 Working valve 403A, 403B Valve cover (second divided body) 404A, 404B Valve stem (second divided body) 410 Working valve 411A, 411B Half-split member 412 1st division body 413 Second division body 500 cutting machine 510 cutting machine

Claims

1. A method for assembling a fluid control device comprising a housing attached to a fluid pipe in a sealed manner, an operating valve attached to an opening of the housing capable of opening and closing the inside of the housing, and a cutting machine attached to the operating valve, the fluid control device having a valve body and an upper cover that controls a flow path of the fluid pipe, the cutting machine and the fluid control device being suspended and installed in a space where no fluid is present in the pipe, in order to install the fluid control device in an uninterrupted flow state in the housing where the fluid pipe has been cut using the cutting machine, The flow control device is constructed from a valve body and a top cover divided body, and after the housing is attached to the fluid pipe in a sealed state, the valve body, which is a first divided body among the divided bodies, is hung down and the valve body is engaged by a locking portion supported by the housing, the top cover, which is the remaining second divided body, is hung down, the top cover is assembled to the valve body engaged in the locking portion, and then the locking portion is released.This is a method for assembling a flow control installation device.

2. 2. The method for assembling a fluid control installation device according to claim 1, further comprising the step of assembling the second divided body to the first divided body in a state in which the second divided body is connected to a crane.

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