Method for assembling fluid control installation device

Abstract

To provide a method for assembling a fluid control installation device capable of reducing a load to a crane.SOLUTION: In a method for assembling a fluid control installation device including a housing 2 attached to a fluid pipe 1 in hermetic seal manner, a work valve 4 attached to its opening part to be able to open / close the inside of the housing 2, and a cutting machine including a cutter for cutting the fluid pipe 1 inside the housing 2 and a drive part 8 for driving the cutter, and suspending and installing the cutting machine and a fluid control 10 in a state with no fluid in the pipe in order to install the fluid control 10 for controlling a channel of the fluid pipe 1 in the housing 2 in a non-interrupted state, the cutter of a first split body and the drive part 8 of a second split body are assembled after attaching the housing 2 to the fluid pipe 1 in a hermetic seal manner, the cutter is moved to the outside of the housing 2 to close the work valve 4 after driving the cutter by the drive part 8 of the cutting machine to cut the fluid pipe 1 in the housing 2, the fluid control 10 and the drive part 8 constituting the cutting machine are assembled to open the work valve 4, and the fluid control 10 is driven by the drive part 8 to be installed in the housing 2.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to an assembly method of an installation device for installing a control fluid in a housing that seals a fluid pipe in a non-stop flow state.

Background Art

[0002] When disposing a control fluid such as a valve or a plug in a fluid pipeline, it is generally performed by cutting a part of the fluid pipe constituting the fluid pipeline and installing the control fluid at the cut portion. As a cutting method for cutting a fluid pipe, a housing is attached to the fluid pipe in a sealed manner, a work valve capable of opening and closing the inside of the housing is attached to an opening of the housing, a cutting machine having a cutter and a drive unit is installed in the work valve, and the cutter is advanced by the drive unit with the work valve open to cut a part of the fluid pipe in a non-stop flow state inside the housing.

[0003] Further, as a method of installing a control fluid at a location where a fluid pipe is cut by the above method, for example, as shown in Patent Document 1, there is a control fluid installation method using a housing, a work valve, and an insertion machine attached to the work valve. The control fluid is installed in the housing in a non-stop flow state by advancing the control fluid by the insertion machine with the work valve open. In such a control fluid installation method, each member such as the housing, the work valve, and the control fluid is suspended by a crane and transported to an installation position and assembled to the fluid pipe (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the installation of a fluid control body as in Patent Document 1, especially when the diameter of the fluid pipe is large, since the housing that externally fits the fluid pipe, the working valve, and the fluid control body installed in the housing also become large, it is necessary to prepare a large crane with a high lifting capacity, and since the movable range and installation space of the crane become large, there is a problem that a large space must be secured for the installation work of the fluid control body. In particular, when using a hole saw as a cutting machine as in Patent Document 1, since a hole saw with a diameter larger than the outer diameter of the fluid pipe is required, accordingly, the weight of the housing that houses the hole saw and the fluid control body installed in this housing in a sealed state increases, and the enlargement of the crane cannot be avoided.

[0006] The present invention has been made paying attention to such problems, and an object thereof is to provide an assembling method of an installation device for a fluid control body that can reduce the load on a crane.

Means for Solving the Problems

[0007] In order to solve the above problems, an assembling method of an installation device for a fluid control body of the present invention is A housing that is attached to a fluid pipe in a sealed manner, a working valve that is attached to an opening of the housing and can open and close the inside of the housing, a cutter that is attached to the working valve and cuts the fluid pipe inside the housing, and a drive unit that drives the cutter. And a method for assembling an installation device for a fluid control body for installing the fluid control body that controls the flow path of the fluid pipe in the housing in a non-stop flow state, At least one of the working valve, the cutting machine, or the fluid control body is composed of a plurality of divided bodies, and after the housing is attached to the fluid pipe in a sealed manner, the divided bodies are sequentially assembled to the housing. According to this feature, a plurality of divided bodies constituting the working valve, the cutting machine, or the fluid control body can be transported separately by a crane, and the load on the crane that suspends and supports them can be reduced, and the crane can be downsized.

[0008] Lock a first one of the plurality of divided bodies to a locking portion provided on the housing, and assemble the remaining second divided bodies to the first divided body locked to the locking portion. According to this feature, in a stable state where the first divided body among the plurality of divided bodies is locked to the locking portion of the housing, the remaining second divided bodies can be accurately attached to the first divided body.

[0009] Assemble the second divided body to the first divided body with the second divided body connected to a crane. According to this feature, when assembling the second divided body to the first divided body, it is possible to prevent the second divided body from falling, so the safety is high.

[0010] The cutting machine is composed of the cutter and the drive unit as the plurality of divided bodies, and the drive unit is characterized in that it is connected so that the control fluid can be inserted into the housing. According to this feature, since the drive unit and the cutter constituting the cutting machine are divided, the drive unit for driving the cutter can be used as an insert tool for the control fluid.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0012] A mode for carrying out the assembling method of the installation device of the fluid control member according to the present invention will be described below based on examples.

Example

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

[0014] As shown in FIG. 1, the periphery of a predetermined portion of the fluid pipe 1 buried in the ground is excavated, and the housing 2 having a two - part structure with a branch portion 2a opening upward is hermetically surrounded. Note that the fluid in the fluid pipe 1 may be, for example, tap water, industrial water, sewage, etc., or may be gas or a gas - liquid mixture of gas and liquid. Further, although the housing 2 has a two - part structure in this example, it may have other multi - part structures, and the joining of the divided housings may be by welding or by attaching with bolts via packing.

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

[0016] Also, when the housing 2 is attached to the fluid pipe 1 in a sealed manner, concrete foundations 9, 9 are formed below the housing 2 to support the weight around the housing 2 and prevent the fluid pipe 1 from bending or the like. Incidentally, as long as it can support the weight of the housing 2 and the cutting machine 5 and the valve introducer 6 described later, it is not limited to the concrete foundations 9, 9, and a jack or the like may be used.

[0017] Next, the process of attaching a working valve 4 capable of closing the opening of the branch portion 2a to the branch portion 2a (opening) of the housing 2 will be described. First, as shown in FIG. 1, the valve box 41 (the first divided body) constituting the working valve 4 is suspended from above by a sling C provided with a hook suspended by a crane (not shown) and a wire W and placed on the flange 2b of the branch portion 2a. While adjusting the position of the valve box 41 on the flange 2b, the flange 2b and the valve box 41 are fixed with bolts and nuts (not shown). The crane used in this embodiment is preferably a mobile rough terrain crane, for example. Needless to say, it is enlarged according to its lifting capacity, and a specification capable of lifting the member with the largest weight among the members described later is selected while considering the allowable lifting load at each turning radius. Also, the installation area of the crane often requires an area wider than the excavation area of the fluid pipe 1 when including outriggers and the like.

[0018] Also, in this embodiment, even after the valve box 41 is placed on the flange 2b of the branch portion 2a, for ensuring safety, the wire W is connected to the crane while being slightly loosened on the valve box 41. However, the present invention is not limited to this, and the lifting tool C and the wire W may be removed from the valve box 41. Further, 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 with respect to the flange 2b while the valve box 41 is slightly lifted by the crane.

[0019] This valve box 41 has a substantially cylindrical shape penetrating in the vertical direction, and a slide groove 41b extending in a substantially horizontal direction is formed from an opening 41a provided on one side. A valve seat portion 41c is formed on the inner side (opposite side to the opening 41a) of the slide groove 41b. The weight of the valve box 41 in this embodiment is approximately 4500 kg in this embodiment. Note that since an O-ring (not shown) is pressed between the flange 2b and the valve box 41, the branch portion 2a and the valve box 41 are connected in a sealed manner. Hereinafter, the weights of the respective members are merely examples and can be changed to appropriate weights.

[0020] Next, as shown in FIG. 2, the valve body 42, the valve cover 43, and the valve rod 44 (second divided body) constituting the working valve 4 are unitized and suspended by the lifting tool C and the 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 with bolts, nuts, etc. (not shown) (see FIG. 3). Specifically, the valve body 42 is attached so as to be able to advance and retreat between a position housed in the valve cover 43 by the valve rod 44 and a position protruding from the valve cover 43. At the position housed in the valve cover 43, a part of the valve body 42 (the end on the side opposite to the valve rod 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, nuts, etc. (not shown). The weights of the valve body 42, the valve cover 43, and the valve rod 44 in this embodiment are approximately 6000 kg in the unitized state.

[0022] In addition, since the packing S1 is pressed against circumferentially between the valve cover 43 and the valve box 41, the sealing performance between the valve cover 43 and the valve box 41 can be ensured (see the enlarged portion in Fig. 3). In this embodiment, the form in which the packing S1 is press-fitted into the concave groove provided on the valve cover 43 side is illustrated, but the present invention is not limited thereto, and a concave groove may be provided on the valve box 41 side, and the packing S1 may be press-fitted into the concave groove.

[0023] In this embodiment, the 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 lifting tool C and the wire W is illustrated, but the present invention is not limited thereto. For example, a mounting table may be arranged near the valve box 41, and the valve body 42, valve cover 43, and valve rod 44 may be mounted on the mounting table and then attached to the valve box 41.

[0024] Thus, the service valve 4 is composed of a first split body (approximately 4500 kg) composed of the valve box 41 and a second split body (approximately 6000 kg) composed of the valve body 42, valve cover 43, and valve rod 44. The service valve 4 is configured by assembling these to the branch portion 2a of the housing 2 in order. That is, since the first split body and the second split body can be transported separately by the lifting tool C and the wire W, compared with the case where the service valve 4 is installed in the branch portion 2a in the assembled state (the service valve 4 with a total weight of 10500 kg), the load on the crane can be dispersed and reduced, so that the crane can be miniaturized, and the working space for installing the service valve 4 can be made space-saving. In addition, since the load on the lifting tool C and the wire W is also reduced, it is not necessary to prepare thick lifting tool C and wire W, and the cost of the lifting tool C and the wire W to be used can also be suppressed.

[0025] In addition, as will be described later, when a hole saw such as the cutter 52 of this embodiment is used as means for cutting the fluid pipe 1, since the hole saw has a larger diameter than the outer diameter of the fluid pipe 1, the structure of the service valve 4 also becomes larger accordingly. Even in such a case, since the first split body and the second split body can be transported separately by the lifting tool C and the wire W, the crane can be suitably miniaturized.

[0026] Here, from the perspective of workability, an example has been shown in which the valve body 42, the valve cover 43, and the valve rod 44 are fixed to the valve box 41 in a unitized state. However, the present invention is not limited thereto. For example, the valve body 42, the valve cover 43, and the valve rod 44 may be separately attached to the valve box 41 in this order to further disperse and reduce the load on the crane.

[0027] Further, the service valve 4 is configured by dividing the valve box 41 installed above the branch portion 2a, and the valve body 42, the valve cover 43, and the valve rod 44 bulging laterally from the valve box 41. After fixing the valve box 41 to the branch portion 2a, in order to fix the valve body 42, the valve cover 43, and the valve rod 44 to the valve box 41, when installing the valve box 41 on the branch portion 2a, the hanging load does not tilt due to the weight balance, and the installation of the valve box 41 on the branch portion 2a becomes simple. Also, when connecting the valve body 42, the valve cover 43, and the valve rod 44 to the valve box 41, similarly, the hanging load does not tilt due to the weight balance, and the connection of the valve body 42, the valve cover 43, and the valve rod 44 to the valve box 41 becomes simple. Further, in order to maintain the weight balance of the service valve 4, it is not necessary to suspend and support a plurality of locations of the service valve 4, so the work space required for installing the service valve 4 can be preferably saved in space.

[0028] Also, when connecting the valve body 42, the valve cover 43, and the 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 laterally until it abuts against the valve box 41, so that the valve body 42 is guided by the valve box 41, and thus the valve body 42, the valve cover 43, and the valve rod 44 can be accurately arranged with respect to the valve box 41.

[0029] Here, in this embodiment, an example has been shown in which the valve cover 43 and the valve box 41 are fixed by bolts and nuts. However, the present invention is not limited thereto. For example, they may be fixed by other fixing means such as a vise, or may be fixed 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 cylinder 51 (cylindrical body) penetrating in the vertical direction is suspended by a suspension tool C and a wire W and lowered above the valve box 41, and the mounting flange cylinder 51 is fixed above the valve box 41 by bolts, nuts, etc. not shown in the figure. The weight of the mounting flange cylinder 51 in this embodiment is approximately 2600 kg. Further, since an O-ring not shown is press-fitted between the mounting flange cylinder 51 and the valve box 41, the valve box 41 and the mounting flange cylinder 51 are connected in a sealed state.

[0031] In addition, in this embodiment, even after the mounting flange cylinder 51 is placed on the valve box 41, for ensuring safety, the wire W is slightly loosened on the mounting flange cylinder 51 and connected to a crane not shown in the figure, but it is not limited to this, and the suspension tool C and the wire W may be removed from the mounting flange cylinder 51. Further, in order to make it easier to adjust the position of the mounting flange cylinder 51, the position of the mounting flange cylinder 51 may be adjusted with respect to the valve box 41 in a state where the mounting flange cylinder 51 is slightly lifted by a crane.

[0032] Next, as shown in FIG. 4, a cutter 52 is temporarily installed on the mounting flange cylinder 51. Specifically, with the lid 53 of the mounting flange cylinder 51 connected above the cutter 52, it is suspended by a suspension tool C and a wire W and lowered above the mounting flange cylinder 51. The cutter 52 includes a cylindrical member 52a having a cutting blade at the peripheral edge and a center drill 52b disposed coaxially with the cylindrical member 52a and protruding beyond the perforating blade, and the cylindrical member 52a and the center drill 52b are fixed. Further, above the cylindrical member 52a and the center drill 52b, an adapter 54 having an annular protrusion 54a formed at the upper end is attached in a non-rotatable manner.

[0033] Further, the lid body 53 has a through hole 53a penetrating vertically in the central portion, and an adapter 54 is inserted into the through hole 53a. Further, the lid body 53 has a plurality of recesses 53b recessed in the outer diameter direction from the inner peripheral surface of the through hole 53a in the circumferential direction, and a fixing jig 55 that can advance and retreat in the radial direction of the through hole 53a is disposed in the recess 53b. The cutter 52 and the lid body 53 are integrated by the fixing jig 55 protruding in the inner diameter direction of the through hole 53a and engaging with the lower surface of the annular protrusion 54a of the adapter 54.

[0034] In this embodiment, the weight of the cutter 52 is approximately 2910 kg, the weight of the lid body 53 is approximately 1900 kg, the weight of the adapter 54 is approximately 290 kg, and the total weight of these is approximately 5100 kg.

[0035] As shown in FIG. 5, with the lid body 53 placed above the mounting flange cylinder 51, alignment is performed between the mounting flange cylinder 51 and the lid body 53, and they are fixed with bolts, nuts, etc. (not shown). At this time, the cutter 52 will be accommodated inside the mounting flange cylinder 51.

[0036] Also, as shown in the enlarged portion of FIG. 5, a packing S2 is press - contacted over the circumferential direction between the mounting flange cylinder 51 and the lid body 53, so that the sealing performance between the mounting flange cylinder 51 and the lid body 53 can be ensured. In this embodiment, an example is shown in which the packing S2 is press - fitted into a concave groove provided on the lid body 53 side, but it is not limited to this, and a concave groove may be provided on the mounting flange cylinder 51 side and the packing S2 may be press - fitted into the concave groove.

[0037] In this embodiment, even after the lid body 53 is placed on the mounting flange cylinder 51, for safety, the wire W is connected to the lid body 53 in a slightly loosened state to the crane, but it is not limited to this, and the lifting tool C and the wire W may be removed from the lid body 53. Also, in order to make it easier to adjust the position of the mounting flange cylinder 51, the position of the mounting flange cylinder 51 may be adjusted with respect to the valve box 41 while the mounting flange cylinder 51 is slightly lifted by a 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. 6.

[0039] As shown in FIG. 6, the drive mechanism 8 mainly includes a shaft member 81, a gripping member 82 that can grip or release the shaft member 81, a reciprocating member 83 that moves the gripping member 82 forward and backward within the axial range of the shaft member 81, a restricting member 84 that can restrict or release the movement of the shaft member 81 at a position below the reciprocating member 83, and a base member 85 to which the reciprocating member 83 and the restricting member 84 are attached. The weight of the drive mechanism 8 in this embodiment is approximately 6060 kg.

[0040] The base member 85 is provided with a plurality of upright support columns 85a, and the reciprocating member 83 is attached so as to be slidable in the vertical direction along the support columns 85a. That is, by gripping the shaft member 81 with the gripping member 82 and moving the reciprocating member 83 along the support columns 85a in this state, the shaft member 81 can be slid in the vertical direction.

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

[0042] Further, a rotary motor 87 is fixed to a part of the reciprocating member 83, and by applying a rotational force to the gripping member 82 that grips the shaft member 81 by the rotary motor 87, rotation can be transmitted to the shaft member 81, and when the shaft member 81 rotates, the cutter 52 can be rotated. Note that by preparing a plurality of shaft members 81, the axial length can be increased by adding them axially, and due to such an adding structure, the weight and height can be reduced.

[0043] As shown in Fig. 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 lid body 53. The shaft member 81 is advanced downward by a predetermined length in advance so that the lower end portion of the shaft member 81 protrudes below the case portion 86. The drive mechanism 8 is suspended by the hoist C and the wire W, and the case portion 86 is placed on the jack 7. Next, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 53c of the lid body 53, and connects the shaft member 81 and the adapter 54 with the bolt nut N1.

[0044] In addition, in this embodiment, even after the drive mechanism 8 is placed on the jack 7, for ensuring safety, the wire W is connected to the crane in a slightly loosened state for the drive mechanism 8, but it is not limited to this, and the hoist C and the wire W may be removed from the drive mechanism 8. Further, in order to make it easier to adjust the position of the drive mechanism 8, the position adjustment between the shaft member 81 and the adapter 54 may be performed in a state where the drive mechanism 8 is slightly lifted by the crane.

[0045] Next, as shown in Fig. 8, the drive mechanism 8, the adapter 54, and the cutter 52 are slightly lifted upward by the crane, the jack 7 is removed from between the case portion 86 and the lid body 53, and the fixing jig 55 is retracted into the concave portion 53b. At this time, since the cutter 52 (about 2910 kg), the adapter 54 (about 290 kg), and the drive mechanism 8 (about 6060 kg) are lifted by the crane, the weight applied to the crane is about 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 lid body 53, the drive mechanism 8 may be placed on the jack 7 to receive the weight, and the weight applied to the crane may be reduced.

[0046] Subsequently, as shown in Fig. 9, the drive mechanism 8 is lifted and lowered by a crane so that the case portion 86 is placed on the upper flange 53c of the lid body 53, and the case portion 86 and the lid body 53 are fixed by bolts and nuts (not shown). As a result, the cutting machine 5 is constituted by the mounting flange cylinder 51, the cutter 52, the lid body 53, the adapter 54, and the drive mechanism 8, and the cutting device is constituted by the housing 2, the working valve 4, and the cutting machine 5. At this time, it goes without saying that the center drill 52b is adjusted so as not to contact the valve body 42.

[0047] Further, when the case portion 86 and the lid body 53 are fixed, the packing S4 is pressed between the case portion 86 and the upper flange 53c of the lid body 53, so that the sealing performance between the case portion 86 and the lid body 53 can be ensured. In the present embodiment, the form in which the packing S4 is press-fitted into the annular groove 86a formed on the lower surface of the case portion 86 is exemplified, but 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 the present embodiment, even after the case portion 86 is placed on the lid body 53, for ensuring safety, the wire W is connected to the drive mechanism 8 in a slightly loosened state to the crane, but the present invention is not limited to this, and the suspension tool C and the wire W may be removed from the drive mechanism 8. Further, in order to make it easier to adjust the position of the drive mechanism 8, the position adjustment between the case portion 86 and the lid body 53 may be performed in a state where the drive mechanism 8 is slightly lifted by a crane.

[0049] Next, the 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 peripheral surface on the rear end side of the shaft member 81 is gripped by the gripping member 82 described above. Next, the rotation 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 retreating member 83 is advanced toward the fluid pipe 1. According to this, first, the center drill 52b of the cutter 52 drills through the pipe wall of the fluid pipe 1.

[0050] The forward movement of the shaft member 81 and the cutter 52 is performed within the range where the gripping member 82 moves the shaft member 81 from the gripping position to a position close to the regulating member 84. The shaft member 81 slides on the packing S3 and moves forward. After the forward movement is completed, the shaft member 81 and the cutter 52 are restricted from moving by the regulating member 84. Then, 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 steps are repeated to cut the cylindrical member 52a of the cutter 52 through the fluid pipe 1. At this time, it is not always necessary to connect another shaft member 81', and the cutting may be completed using a shaft member 81 of a predetermined length in advance.

[0051] As shown in FIG. 11, when the fluid pipe 1 is cut by the cutter 52, a section 1a formed by cutting the fluid pipe 1 is held inside the cylindrical member 52a. Then, the shaft member 81 and the cutter 52 are moved backward in the reverse procedure of the above steps, pulled up inside the mounting flange cylinder 51 together with the section 1a, 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 sealed manner, and after the working valve 4 is attached to the branch portion 2a of the housing 2, the cutter 52, the lid body 53, and the adapter 54 are installed in a unitized state on the working valve 4, and the driving mechanism 8 is attached to the cutter 52, the lid body 53, and the adapter 54 installed on the working valve 4 to constitute the cutting machine 5. According to this, since the cutter 52, the lid body 53, and the adapter 54 (approximately 5100 kg) and the driving mechanism 8 (approximately 6060 kg) in the cutting machine 5 can be transported separately, compared with the case of installing the cutting machine 5 in a assembled state on the working valve 4 (approximately 11160 kg), the load on the crane can be dispersed and reduced, so that the crane can be miniaturized, and the working space for installing the cutting machine 5 can be made space-saving.

[0053] In particular, when using a hole saw such as cutter 52 as in this embodiment, since a cylindrical member 52a having a diameter larger than at least that of the fluid pipe 1 is required, the configuration of the cutting machine 5 also becomes larger. Even in such a case, since the cutter 52, the lid 53, the adapter 54, and the drive mechanism 8 are installed separately, the load on the crane can be dispersed, and the crane can be suitably miniaturized.

[0054] Here, from the viewpoint of workability, a form in which the cutter 52, the lid 53, and the adapter 54 are fixed to the mounting flange cylinder 51 in a unitized state has been exemplified, but the present invention is not limited thereto. For example, the cutter 52, the lid 53, and the adapter 54 may be separately and sequentially attached to the mounting flange cylinder 51 so as to further disperse and reduce the load on the crane. In this case, holding means for holding the cutter 52 in the mounting flange cylinder 51 may be prepared.

[0055] In addition, a mounting flange cylinder 51 (about 2600 kg) capable of accommodating the cutter 52 is installed on the working valve 4, and the cutter 52, the lid 53, and the adapter 54 are installed on the mounting flange cylinder 51. Therefore, the cutter 52 is inserted while being guided by the mounting flange cylinder 51, and the cutter 52 can be accurately installed with respect to the fluid pipe 1 while being positioned. Further, compared with the case where the cutter 52, the lid 53, the adapter 54, and the mounting flange cylinder 51 are installed on the working valve 4 in a unitized state (about 7700 kg), the load on the crane can be reduced.

[0056] Further, with the cutter 52 and the lid 53 connected by the fixing jig 55, the cutter 52 is accommodated in the mounting flange cylinder 51, and the lid 53 and the mounting flange cylinder 51 are fixed. Therefore, the cutter 52 can be held using the lid 53 that closes the mounting flange cylinder 51 in a sealed state. According to this, it is not necessary to separately prepare a special jig for holding the cutter 52, and the structure can be simplified.

[0057] Also, with the case portion 86 of the drive mechanism 8 separated from the lid body 53, after connecting the cutter 52 (adapter 54) and the shaft member 81 of the drive mechanism 8 through the through hole 53a of the lid body 53, the case portion 86 is connected to the lid body 53 in a sealed manner. According to this, since the cutter 52 and the shaft member 81 can be connected from the gap between the case portion 86 of the drive mechanism 8 and the lid body 53, 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 portion 86 or the lid body 53, and the structure can be simplified. Further, since the case portion 86 and the lid body 53 are connected after the cutter 52 and the shaft member 81 are connected, the case portion 86 and the lid body 53 can be guided by the adapter 54 and the shaft member 81, and the connection work can be performed in a stable state.

[0058] Also, with the jack 7 as a spacer disposed between the case portion 86 and the lid body 53, an operator can access from the gap between the case portion 86 formed by the jack 7 and the upper flange 53c of the lid body 53 to connect the shaft member 81 and the adapter 54 with the bolt nut N1. Therefore, it is possible to prevent the drive mechanism 8 from falling during the connection work of the shaft member 81 and the adapter 54, and the safety is high. Further, by placing the case portion 86 on the jack 7, the case portion 86 is more stable than in the state of being suspended by the hoisting tool C and the wire W, so that the connection work of the shaft member 81 and the adapter 54 can be easily performed.

[0059] Note that although not particularly shown, with the branch portion 2a blocked by the valve body 42 of the working valve 4, first, the drive mechanism 8 is removed from the lid body 53, the lid body 53 and the cutter 52 are removed from the mounting flange cylinder 51 together with the section 1a, and the mounting flange cylinder 51 is removed from the working valve 4, thereby completing the removal work of the cutting machine 5. In this way, since each member constituting the cutting machine 5 can be transported separately by a crane, the load on the crane during the removal work of the cutting machine 5 can be reduced.

[0060] Next, the process of installing the valve introduction machine 6 for installing the butterfly valve 10 at the cut portion of the fluid pipe 1 will be described. As shown in FIG. 12, first, with the branch portion 2a 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 suspension tool C and a wire W and lowered above the working valve 4, and the cylindrical member 61 is fixed above the working valve 4 with bolts, nuts, etc. not shown. The weight of the cylindrical member 61 in this embodiment is approximately 3000 kg. Further, since an O-ring not shown is pressed between the cylindrical member 61 and the working valve 4 (valve box 41), the cylindrical member 61 and the working valve 4 are connected in a sealed manner.

[0061] In addition, in this embodiment, even after the cylindrical member 61 is placed on the working valve 4, for ensuring safety, the wire W is connected to the crane in a slightly loosened state with respect to the cylindrical member 61, but it is not limited to this, and the suspension tool C and the wire W may be removed from the cylindrical member 61. Further, in order to make it easier to adjust the position of the cylindrical member 61, the position adjustment between the valve box 41 and the cylindrical member 61 may be performed with the cylindrical member 61 slightly lifted by the crane.

[0062] Next, the process of temporarily installing the butterfly valve 10 on the cylindrical member 61 will be described. First, the structure of the butterfly valve 10 will be described with reference to FIG. 14.

[0063] As shown in FIG. 14, the butterfly valve 10 controls the flow path of the fluid pipe 1 to a state where the fluid can pass through and a state where it cannot pass through. It includes a partition wall 11 having an opening in its approximate center, an opening and closing shaft 12 rotatably attached to the upper end of the partition wall 11, a valve body 13 provided to be able to open and close the opening of the partition wall 11 by rotating around the opening and closing shaft 12, and a substantially circular upper lid portion 14 (lid body portion) extending in a substantially horizontal direction and connected to the upper end of the partition wall 11 in a sealed manner. Packing S5 is fixed to both side surfaces and the bottom surface of the partition wall 11, and packing S6 is fixed to the entire outer peripheral surface of the upper lid portion 14, and the packings S5 and S6 are connected so as to be continuous. Incidentally, the total weight of the butterfly valve 10 in this embodiment is approximately 9540 kg. Furthermore, it goes without saying that the space between the partition wall 11 and the upper lid portion 14 is sealed with packing or the like.

[0064] As shown in FIG. 13, when temporarily installing the butterfly valve 10 in the cylindrical member 61, first, with the partition wall 11, the opening and closing shaft 12, and the valve body 13 (main body portion) integrated, they are suspended by a hoist C and a wire W and lowered to a position where they are accommodated in the cylindrical member 61. At this time, the valve body 13 is arranged so as to be substantially parallel to the pipe axis direction (in a state where the opening of the partition wall 11 is open).

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

[0066] Next, as shown in FIG. 14, the upper lid portion 14 is suspended by a hoist C and a wire W and placed on the upper part of the partition wall 11 with the opening and closing shaft 12 inserted therethrough. Then, the upper lid portion 14 and the partition wall 11 are connected in a sealed manner by fixing means (not shown) to constitute the butterfly valve 10.

[0067] Still, in this embodiment, even after the upper lid portion 14 is placed on the partition wall 11, for safety assurance, the wire W is connected to the crane in a slightly loosened state on the upper lid portion 14, but it is not limited to this, and the lifting tool C and the wire W may be removed from the upper lid portion 14. Also, in order to make it easier to adjust the position of the upper lid portion 14, the position adjustment between the upper lid portion 14 and the partition wall 11, the opening and closing shaft 12, and the valve body 13 may be performed in a state where the upper lid portion 14 is slightly lifted by the crane.

[0068] Furthermore, in this embodiment, an example is shown in which the butterfly valve 10 is configured on the cylindrical member 61 by fixing the upper lid portion 14 to the integrated partition wall 11, opening and closing shaft 12, and valve body 13, but the butterfly valve 10 may also be configured by separately installing the partition wall 11, opening and closing shaft 12, valve body 13, and upper lid portion 14 in order. Also, the partition wall 11 and the valve body 13 may be integrated, the opening and closing shaft 12 and the upper lid portion 14 may be integrated, and the butterfly valve 10 may be configured by assembling them. That is, at least the upper lid portion 14 is divided from other members (main body portion), and it can be freely changed as long as the butterfly valve 10 is configured by assembling them.

[0069] Next, as shown in FIG. 15, the mounting flange cylinder 63 penetrating in the vertical direction is suspended by the lifting tool C and the wire W and lowered above the cylindrical member 61, and the mounting flange cylinder 63 is fixed above the cylindrical member 61 by bolts, nuts, etc. not shown. The weight of the mounting flange cylinder 63 in this embodiment is approximately 2600 kg.

[0070] Still, in this embodiment, even after the mounting flange cylinder 63 is placed on the cylindrical member 61, for safety assurance, the wire W is connected to the crane in a slightly loosened state on the mounting flange cylinder 63, but it is not limited to this, and the lifting tool C and the wire W may be removed from the mounting flange cylinder 63. Also, in order to make it easier to adjust the position of the mounting flange cylinder 63, the position adjustment between the mounting flange cylinder 63 and the cylindrical member 61 may be performed in a state where the mounting flange cylinder 63 is slightly lifted by the crane.

[0071] Further, as shown in the enlarged view of FIG. 15, an annular groove 63a is formed on the lower surface of the mounting flange cylinder 63, and an annular packing S7 is press-fitted into the annular groove 63a. When the cylindrical member 61 and the mounting flange cylinder 63 are fixed, the packing S7 is press-contacted between the cylindrical member 61 and the mounting flange cylinder 63, so that the sealing performance between the cylindrical member 61 and the mounting flange cylinder 63 can be ensured. In this embodiment, the form in which the packing S7 is press-fitted into the annular groove 63a formed on the lower surface of the mounting flange cylinder 63 is illustrated, but the present invention is not limited to this, 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 suspension fitting 64 connected to the butterfly valve 10 is temporarily installed on the mounting flange cylinder 63. Specifically, with the lid 65 of the mounting flange cylinder 63 connected above the valve suspension fitting 64, it is suspended by a suspension tool C and a wire W and lowered to above the mounting flange cylinder 63. The valve suspension fitting 64 includes a mounting surface portion 64a facing in a substantially horizontal direction, a cylindrical shaft portion 64c extending upward from a through hole 64b provided substantially at the center of the mounting surface portion 64a, and a reinforcing rib 64d provided across between the mounting surface portion 64a and the shaft portion 64c. An adapter 66 is connected to the upper end portion of the shaft portion 64c.

[0073] The lid 65 has a through hole 65a penetrating in the vertical direction at the center, and the adapter 66 is inserted through the through hole 65a. The lid 65 has a plurality of recesses 65b recessed in the outer diameter direction from the inner peripheral surface of the through hole 65a in the circumferential direction, and a fixing jig 67 that can advance and retreat in the radial direction of the through hole 65a is disposed in the recess 65b. The valve suspension fitting 64 and the lid 65 are integrated by the fixing jig 67 protruding in the inner diameter direction of the through hole 65a and engaging with the lower surface of the annular protrusion 66a of the adapter 66.

[0074] The weight of the valve suspension fitting 64 in this embodiment is approximately 2000 kg, the weight of the lid 65 is approximately 1900 kg, and the weight of the adapter 66 is approximately 270 kg. The total weight of these is approximately 4170 kg.

[0075] As shown in FIG. 17, with the lid body 65 placed on the upper end of the mounting flange cylinder 63, alignment is performed between the mounting flange cylinder 63 and the lid body 65, and they are fixed with bolts, nuts, etc. (not shown). In this embodiment, even after the lid body 65 is placed on the mounting flange cylinder 63, for ensuring safety, the wire W is connected to the lid body 65 in a slightly loosened state to the crane, but it is not limited thereto, and the lifting 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 adjustment between the mounting flange cylinder 63 and the lid body 65 may be performed with the lid body 65 slightly lifted by the crane.

[0076] As shown in the enlarged portion of FIG. 17, since the packing S8 is pressed in the circumferential direction between the mounting flange cylinder 63 and the lid body 65, the sealing performance between the mounting flange cylinder 63 and the lid body 65 can be ensured. In this embodiment, an example is shown in which the packing S8 is press-fitted into the concave groove provided on the lid body 65 side, but it is not limited thereto, and a concave groove may be provided on the mounting flange cylinder 63 side and the packing S8 may be press-fitted into the concave groove.

[0077] Next, the drive mechanism 8 as the insertion machine of the valve introduction machine 6 is connected to the valve suspension fitting 64. Since the drive mechanism 8 uses the same one as that used during the cutting operation of the fluid pipe 1, the description of the structure of the drive mechanism 8 is omitted.

[0078] As shown in FIG. 18, when connecting the drive mechanism 8 to the valve suspension fitting 64, the shaft member 81 is advanced downward by a predetermined length in advance so that the lower end portion of the shaft member 81 protrudes below the case portion 86, and a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 65c of the lid body 65. The drive mechanism 8 is suspended by the crane and the case portion 86 is placed on the jack 7. Then, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 65c of the lid body 65, and the shaft member 81 and the adapter 66 are connected with bolts and nuts N2.

[0079] Next, as shown in FIG. 19, the drive mechanism 8, the adapter 66, and the valve suspension bracket 64 are slightly lifted upward by a crane, the jack 7 is removed from between the case portion 86 and the lid body 65, and the fixing jig 55 is retracted into the concave portion 53b. At this time, since the valve suspension bracket 64 (approximately 2000 kg), the adapter 66 (approximately 270 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the lifting tool C and the wire W, the weight applied to the lifting 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 lid body 65, the drive mechanism 8 may be placed on the jack 7 to receive the weight, and the weight applied to the crane may be reduced.

[0080] Next, although not particularly shown, the drive mechanism 8 is lifted and lowered by the lifting tool C and the wire W so that the case portion 86 is placed on the upper flange 65c of the lid body 65, and the case portion 86 and the lid body 65 are fixed by bolts and nuts (not shown). Further, when the case portion 86 and the lid body 65 are fixed, since the packing S4 is pressed between the case portion 86 and the upper flange 65c of the lid body 65, the sealing performance between the case portion 86 and the lid body 65 can be ensured. In this embodiment, the form in which the packing S4 is disposed on the lower surface of the case portion 86 is illustrated, but the present invention is not limited thereto, 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 portion 86 is placed on the lid body 65, the wire W is connected to the drive mechanism 8 in a slightly loosened state to the crane for ensuring safety, but the present invention is not limited thereto, and the lifting tool C and the wire W may be removed from the drive mechanism 8. Further, in order to facilitate the position adjustment of the drive mechanism 8, the position adjustment between the case portion 86 and the lid body 65 may be performed in a state where the drive mechanism 8 is slightly lifted by a crane.

[0082] Next, as shown in FIG. 20, the valve suspension fitting 64 is lowered by the drive mechanism 8, and the attachment surface portion 64a of the valve suspension fitting 64 and the upper lid portion 14 of the butterfly valve 10 are connected by bolts and nuts (not shown). Thereby, the valve introduction device 6 is constituted by the cylindrical member 61, the attachment flange cylinder 63, the valve suspension fitting 64, the lid body 65, the adapter 66, and the drive mechanism 8, and the valve installation device is constituted by the housing 2, the service valve 4, and the valve introduction device 6. At this time, the opening / closing shaft 12 of the butterfly valve 10 is inserted into the shaft portion 64c of the valve suspension fitting 64.

[0083] Thereafter, the drive mechanism 8 slightly lifts the valve suspension fitting 64 and the butterfly valve 10 upward, retracts the locking member 62, and pulls it out from the window portion 61a of the cylindrical member 61. Although not shown, the window portion 61a is plugged so as to be sealed. Needless to say, at this time, the lower end portion of the butterfly valve 10 is adjusted so as not to contact the valve body 42.

[0084] Next, the process of installing the butterfly valve 10 at the cut portion of the fluid pipe 1 by the valve introduction device 6 will be described. As shown in FIG. 21, the valve body 42 of the service valve 4 is retracted to open the branch portion 2a, and the outer peripheral surface on the rear end side of the shaft member 81 is gripped by the gripping member 82 described above. Then, the shaft member 81 and the butterfly valve 10 are advanced toward the fluid pipe 1 by sliding the advancing / retreating member 83 toward the fluid pipe 1.

[0085] The advancing movement of the shaft member 81 and the butterfly valve 10 is performed within a range where the gripping member 82 approaches the restricting member 84 from the gripping position of the shaft member 81, and the shaft member 81 and the butterfly valve 10 after the completion of the advancing movement are movement-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 arrange the butterfly valve 10 at the cut portion of the fluid pipe 1. After the butterfly valve 10 is arranged 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, it is not always necessary to connect another shaft member 81', and the arrangement may be completed by using a shaft member 81 having a predetermined length in advance.

[0086] Further, when the butterfly valve 10 is fixed to the housing 2, the packing S5 of the partition wall 11 is pressed against both inner side surfaces and the inner bottom surface of the housing 2, and the packing S6 of the upper lid portion 14 is pressed against the inner peripheral surface of the branch portion 2a. Therefore, it is possible to prevent the fluid flowing through the fluid pipe 1 from flowing around from between the partition wall 11 and the housing 2, and to prevent the fluid from leaking from the branch portion 2a.

[0087] Next, as shown in FIG. 22, the fluid in the cylindrical member 61 and the mounting flange cylinder 63 is discharged to the outside, and access is made from the working hole portion 61b of the cylindrical member 61 to release the connection between the mounting surface portion 64a of the valve suspension fitting 64 and the upper lid portion 14 of the butterfly valve 10 by bolts and nuts. Then, the shaft member 81 is retracted and moved in the reverse procedure of the above process, and the valve suspension fitting 64 is pulled up into the cylindrical member 61 and the mounting flange cylinder 63, thereby completing the work of installing the butterfly valve 10 at the cutting portion of the fluid pipe 1.

[0088] Although not particularly shown, first, the drive mechanism 8 is removed from the lid body 65, the lid body 65 and the valve suspension fitting 64 are removed from the mounting flange cylinder 63, the mounting flange cylinder 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 introduction machine 6. In this way, since each member constituting the valve introduction machine 6 can be separately transported by a crane, the load on the crane during the removal work of the valve introduction machine 6 can be reduced. Thereafter, by removing the working valve 4 from the branch portion 2a of the housing 2, a series of operations from cutting a predetermined portion of the fluid pipe 1 to installing the butterfly valve 10 at the cutting portion are completed.

[0089] In this way, the partition wall 11, the opening and closing shaft 12, and the valve body 13 are installed in the working valve 4, and the upper lid portion 14 is attached to the partition wall 11, the opening and closing shaft 12, and the valve body 13 installed in the working valve 4 to constitute the butterfly valve 10. According to this, since the partition wall 11, the opening and closing shaft 12, and the valve body 13, which are the main body portions of the butterfly valve 10, and the upper lid portion 14, which is the lid body portion, can be transported separately, when installing the butterfly valve 10 in the cylindrical member 61 in the assembled state (approximately 9540 kg), compared with this, the load on the crane can be dispersed and reduced, so the crane can be miniaturized, and the working space for installing the butterfly valve 10 can be made space-saving.

[0090] When using a hole saw such as the cutter 52 as in this embodiment, since at least a cylindrical member 52a having a larger diameter than the fluid pipe 1 is required, the configuration of the housing 2 also becomes larger, and accordingly, the butterfly valve 10, particularly the upper lid portion 14 for closing the branch portion 2a, becomes larger. However, even in such a case, since the partition wall 11, the opening and closing shaft 12, and the valve body 13 and the upper lid portion 14 are installed separately, the load on the crane can be dispersed, and the crane can be suitably miniaturized.

[0091] Further, a cylindrical member 61 (approximately 3000 kg) capable of accommodating the butterfly valve 10 is installed in the working valve 4, the partition wall 11, the opening and closing shaft 12, and the valve body 13 are installed in the cylindrical member 61, and the upper lid portion 14 is attached to the partition wall 11, the opening and closing shaft 12, and the valve body 13 installed in the cylindrical member 61. Therefore, the butterfly valve 10 can be accurately installed while being positioned by using the cylindrical member 61 installed in the working valve 4.

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

[0093] Also, in a state where the butterfly valve 10 is held by the locking member 62, in order to connect the drive mechanism 8 and the valve suspension fitting 64 (insertion machine) to the butterfly valve 10, the drive mechanism 8 and the valve suspension fitting 64 can be accurately attached to the butterfly valve 10 in a stabilized state, and the butterfly valve 10 can be installed at a desired position within the housing 2 by the drive mechanism 8 and the valve suspension fitting 64.

[0094] Furthermore, after the butterfly valve 10 is constructed, since the drive mechanism 8 and the valve suspension fitting 64 are connected to form the valve introduction machine 6, compared with installing the butterfly valve 10, the drive mechanism 8, and the valve suspension fitting 64 in an integrated assembled state on the service valve 4, the load on the crane can be reduced.

[0095] Also, between the drive mechanism 8 and the valve suspension fitting 64 and the butterfly valve 10, specifically, a jack 7 as a spacer is disposed between the case portion 86 of the drive mechanism 8 and the lid body 65, and the attachment surface portion 64a of the valve suspension fitting 64 connected to the drive mechanism 8 placed on the jack 7 is connected to the upper lid portion 14 of the butterfly valve 10. According to this, since the load of the drive mechanism 8 and the valve suspension fitting 64 can be connected to the butterfly valve 10 in a state of being entrusted to the jack 7, not only is the connection work facilitated, but also the load on the crane can be reduced.

[0096] As described above, the working valve 4, the cutting machine 5, and the butterfly valve 10 are each composed of a plurality of divided bodies. After the housing 2 is hermetically attached to the fluid pipe 1, the divided bodies are sequentially assembled to the housing 2. Specifically, in the case of the working valve 4, it is divided into a valve box 41, a valve body 42, a valve cover 43, and a valve rod 44, and the working valve 4 is constituted by sequentially assembling these to the housing 2. Also, in the case of the cutting machine 5, it is divided into a mounting flange cylinder 51, a cutter 52, a lid body 53, and a drive mechanism 8, and the cutting machine 5 is constituted by sequentially assembling these to the working valve 4 connected to the housing 2. Further, in the case of the butterfly valve 10, it is divided into a partition wall 11, an opening / closing shaft 12, a valve body 13, and an upper lid portion 14, and the butterfly valve 10 is constituted by sequentially assembling these to the working valve 4 connected to the housing 2. According to this, since the plurality of divided bodies constituting the working valve 4, the cutting machine 5, and the butterfly valve 10 can be transported separately by a crane, the load on the crane can be reduced and the crane can be miniaturized.

[0097] Further, among the plurality of divided bodies, the first divided body is locked to a locking portion provided on the housing 2, and the remaining second divided bodies are 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 bodies, are assembled to the valve box 41. Also, 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 lid body 53 of a mounting flange cylinder 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. Further, in the case of the butterfly valve 10, the partition wall 11, which is the first divided body, is locked to a locking member 62 (locking portion) provided on a cylindrical member 61 connected to the housing 2 via the working valve 4, and the upper lid portion 14, which is the second divided body, is assembled to the partition wall 11. According to this, in a stable state where the first divided body (valve box 41, cutter 52, partition wall 11) among the plurality of divided bodies is locked to the locking portion (branch portion 2a, fixing jig 55, locking member 62) of the housing 2, the remaining second divided bodies (valve body 42 and valve cover 43, drive mechanism 8, upper lid portion 14) can be accurately attached to this first divided body.

[0098] Also, the cutting machine 5 is composed of a cutter 52 and a drive mechanism 8 as the plurality of 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 cutter 52 and the drive mechanism 8 constituting the cutting machine 5 are divided, the drive mechanism 8 for driving the cutter 52 can be used as an insertion tool for the butterfly valve 10. In other words, since the drive mechanism 8 can be used both for driving and advancing / retreating the cutter 52 and for inserting the butterfly valve 10, the structure can be simplified.

[0099] In the present embodiment, the working valve 4, the cutting machine 5, and the butterfly valve 10 are each exemplified as being composed of a plurality of divided bodies. However, 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 composed of a plurality of divided bodies. Further, it goes without saying that lids are attached to all window portions, working hole portions, etc. in a sealed manner during cutting or valve introduction in a non-stop flow state.

[0100] Next, the working valve of Modification 1 will be described with reference to FIG. 23. Note that descriptions of configurations that are the same as those in the above embodiment will be omitted.

[0101] As shown in FIG. 23, the working valve 400 in Modification 1 includes a valve box 401 having a substantially cylindrical shape penetrating in the vertical direction, valve bodies 402A and 402B disposed on both sides in the pipe axis direction of the fluid pipe 1 in the valve box 401, valve covers 403A and 403B for housing the valve bodies 402A and 402B, and valve rods 404A and 404B for moving the valve bodies 402A and 402B with respect to the valve covers 403A and 403B.

[0102] The valve box 401 is provided with openings 401a and 401b facing each other in the pipe axis direction of the fluid pipe 1, and a slide groove 401c is formed so as to communicate the openings 401a and 401b. The working valve 400 is configured by fixedly attaching the valve covers 403A and 403B to the valve box 401 in a sealed manner with the valve bodies 402A and 402B inserted into the openings 401a and 401b, respectively. 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 can come into contact with each other to close the branch portion 2a of the housing 2.

[0103] By making the valve bodies 402A and 402B, the valve covers 403A and 403B, and the valve rods 404A and 404B into a split structure and installing them separately in order, the load on the crane used when installing the service valve 400 can be reduced. Further, the valve box 401 is provided with openings 401a and 401b on both opposite sides. Since the valve bodies 402A and 402B, the valve covers 403A and 403B, and the valve rods 404A and 404B are attached to the openings 401a and 401b, the weight balance of the service valve 400 can be stabilized, and it is possible to suppress uneven load from being applied to the connection portion between the service valve 400 and the housing 2.

[0104] Next, the service valve of Modification 2 will be described with reference to FIG. 24. As shown in FIG. 24, the service valve 410 includes a first divided body 412 in which a half member 411A (a divided body of the valve box), a valve body 402A, a valve cover 403A, and a valve rod 404A are unitized, and a half member 411B (a divided body of the valve box), a valve body 402B, a valve cover 403B, and a valve rod 404B are unitized. The second divided body 413 may be configured by assembling the first divided body 412 and the second divided body 413 on the branch portion 2a of the housing 2. Incidentally, the members may be assembled to the branch portion 2a of the housing 2 to form the service valve 410. In this case, since the valve box is composed of a plurality of half members 411A and 411B, the load on the crane can be reduced.

[0105] Further, in the above embodiment, the form in which the cutter 52 is a hole saw composed of a cylindrical member 52a and a center drill 52b is exemplified, but it is not limited thereto and can be freely changed. For example, as shown in FIG. 25, the cutting machine 500 in Modification 3 includes a cutter mechanism 501 externally fitted to a predetermined portion of the fluid pipe 1 in the housing 20, a work case 502 attached above the service valve 402, and a drive mechanism 800 capable of driving the cutter mechanism 501 and pulling it up into the work case 502.

[0106] The cutter mechanism 501 includes two sprockets 501a, 501a rotatably provided in the circumferential direction of the outer periphery of the fluid pipe 1, and a drive transmission part 501b for transmitting a driving force to the sprockets 501a, 501a. A cutting tool (not shown) for cutting the fluid pipe 1 is attached to the sprockets 501a, 501a. Further, the drive mechanism 800 includes a rod 801 connected to the drive transmission part 501b, a motor 802 for rotationally driving the rod 801, and a lifting mechanism 803 capable of lifting the rod 801.

[0107] By driving the motor 802, the sprockets 501a, 501a rotate via the rod 801 and the drive transmission part 501b, and the fluid pipe 1 can be cut. Also, the cutter mechanism 501 can be lifted into the work case 502 by the lifting mechanism 803 while the sprockets 501a, 501a hold the section of the fluid pipe 1.

[0108] Also, there is the following as a modified example of the cutting machine. As shown in FIG. 26, the cutting machine 510 in the modified example 4 includes a cylindrical body 511 fixed via a work valve 403 above the branch part 200a of the housing 200, a base plate 512 connected to the upper part of the cylindrical body 511, a movable plate 513 provided so as to be relatively movable with respect 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 the upper part of the movable plate 513, a drive 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 to open at the central part of the base plate 512, and rails 517, 517 extending along the pipe axis direction of the fluid pipe 1 are arranged in parallel with the slit 512a interposed therebetween on the upper surface of the base plate 512. Note that a packing is fixed around the slit 512a.

[0110] The movable plate 513 has slits 513a and recesses 518, 518 fitted to the rails 517, 517, and is slidable on the rails 517, 517. Further, the movable plate 513 has a structural portion 520 having a screw hole 519 formed to protrude upward. Note that the movable plate 513 is configured to slide while being in sealing 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 tube axis direction on the upper surface of the base plate 512, and a screw rod 522 rotatably attached between the standing pieces 521, 521 and immovable in the axial direction. The screw rod 522 is screwed into the screw hole 519 of the structural portion 520 in the movable plate 513. That is, when the screw rod 522 rotates about its axis, the movable plate 513 slides in the tube axis direction of the fluid tube 1. Note that a handle 522a is attached to one end of the screw rod 522, and the rotation operation of the screw rod 522 can be performed by gripping the handle 522a.

[0112] According to this, the fluid tube 1 can be drilled by advancing the end mill 515 while rotating it by the drive mechanism 516, and in this state, by sliding the movable plate 513 in the tube axis direction of the fluid tube 1, a first cutting portion (not shown) extending in the tube axis direction can be formed in the fluid tube 1. Further, after forming the first cutting portion, the end mill 515 is positioned at the axial center portion of the first cutting portion, and by rotating the housing 200 by the rotation mechanism 523, a second cutting portion extending along the circumferential direction of the fluid tube 1 can be formed.

[0113] That is, by inserting the valve body 13 through the first cutting portion and inserting the partition wall 11 through the second cutting portion, the butterfly valve 10 can be installed in the fluid tube 1 with the valve body 13 open, so that the influence of the fluid flowing through the fluid tube 1 can be suppressed. Thus, as long as at least an opening into which a fluid control member such as the butterfly valve 10 can be inserted and installed can be formed, it is not limited to cutting the fluid tube 1.

[0114] As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and changes and additions within the scope not departing from the gist of the present invention are also included in the present invention.

[0115] For example, in the above embodiment, the form using the butterfly valve 10 as the control fluid is exemplified. However, the present invention is not limited thereto. For example, the control fluid may be a partition valve, a plug, or a switching valve, etc. For example, in the above embodiment, the form in which the butterfly valve 10 is composed of a plurality of divided bodies is exemplified. However, it is not limited thereto, and the control fluid may be integrally formed.

Explanation of Reference Numerals

[0116] 1 Fluid pipe 2 Housing 2a Branch portion (opening) 2b Flange (locking portion) 4 Working valve 5 Cutting machine 6 Valve introducer 7 Jack (spacer) 8 Driving mechanism (driving portion, inserter, second divided body) 10 Butterfly valve (control fluid) 11 Partition wall (main body portion, first divided body) 12 Opening and closing shaft (main body portion, first divided body) 13 Valve body (main body portion, first divided body) 14 Upper lid portion (lid body portion, second divided body) 20 Housing 41 Valve box (first divided body) 41c Valve seat portion 42 Valve body (second divided body) 43 Valve lid (second divided body) 44 Valve rod (second divided body) 51 Mounting flange cylinder (cylindrical body) 52 Cutter (first divided body) 53 Lid body (first divided body) 54 Adapter (first divided body) 55 Fixing jig (locking portion) 61 Cylindrical member (cylindrical body) 62 Locking member (locking portion) 63 Mounting flange cylinder (cylindrical body) 64 Valve suspension fitting 65 Cover body 66 Adapter 81, 81’ Shaft member (drive shaft) 86 Case portion (case) 200 Housing 200a Branch portion (opening) 400 Working valve 401 Valve box (first divided body) 402 Working valve 402A, 402B Valve body (second divided body) 403 Working valve 403A, 403B Valve cover (second divided body) 404A, 404B Valve rod (second divided body) 410 Working valve 411A, 411B Half-divided member 412 First divided body 413 Second divided 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 and capable of opening and closing the inside of the housing, a cutter for cutting the fluid pipe inside the housing, and a cutting machine having a drive unit for driving the cutter, the method comprising suspending and installing the cutting machine and the fluid control device in a space where no fluid is present in the pipe in order to install a fluid control device for controlling a flow path of the fluid pipe in an uninterrupted state inside the housing where the fluid pipe has been cut using the cutting machine, At least the cutting machine is composed of a plurality of divided bodies, and after the housing is hermetically attached to the fluid pipe, the cutter, which is a first divided body among the plurality of divided bodies, and the drive unit, which is a second divided body, are assembled; After the cutter is driven by the drive unit of the cutting machine to cut the fluid pipe inside the housing, the cutter is moved to the outside of the housing to close the working valve; Assembling the fluid control unit and the drive unit constituting the cutting machine; A method for assembling a fluid control device installation device, comprising the steps of: opening the operating valve; and driving the fluid control device with the drive unit to install it in the housing.

2. The method for assembling a fluid control installation device as described in claim 1, characterized in that the fluid control device is composed of a plurality of divided bodies, and a main body portion which is a first divided body among the plurality of divided bodies and a cover body portion which is the remaining second divided body are assembled.

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