JP2016095019A - Valve body removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve body removal device capable of facilitating sealed fitting work of a fitting member.SOLUTION: A valve body removal device removes a valve body part of a valve device including a conduit part body connected to a fluid pipe and the valve body part capable of closing the conduit part body, in a non-cutoff flow condition with a working valve and a valve movement means. The valve body removal device includes: a working case surrounding a neck part side constituting the conduit part body; a fitting member 23 comprising a plurality of split bodies 24, 25 for fixing the working case to the neck part in a sealed state; and a guide means 47 guiding the split bodies 24, 25 to a connection position of the split bodies 24, 25.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a valve body removing device that removes a valve body of a valve device connected to an existing fluid pipe in an uninterrupted state.

  The existing fluid pipe such as a water main pipe is provided with a valve device such as a gate valve so that the fluid conduit of the existing fluid pipe can be shut off. Such a valve device is composed of a conduit main body connected to an existing fluid pipe and a valve main body composed of a valve body, an operating shaft, etc., and when the valve main body has deteriorated over time, the valve device is In order to use it only as a fluid pipe line, or to reuse it as a valve device in the future, a removal work for removing only the valve body part while leaving the pipe part body has been performed.

  As such a construction method, an annular lower mounting frame member (mounting member) is fixed by sandwiching the two divided bodies from the circumferential direction with respect to the flange of the neck portion of the pipe body exposed by excavating the buried ground. And connecting the work housing provided with the upper mounting frame material, the working on-off valve, and the lifting and lowering conveying means (valve moving means) to the lower mounting frame material, the valve main body side of the conduit main body Is formed in a sealed manner, and the valve body is removed from the conduit body by operating the lifting and lowering conveying means in the working case (see, for example, Patent Document 1).

JP 2014-29195 A (pages 11 to 13 and FIG. 8)

  In the valve body removal device as in Patent Document 1, it is necessary to suspend and move various members constituting the work case from the ground to the flange of the neck portion of the pipe section body using a crane or the like. In particular, in the lower mounting member that is the base of the work case, the two divided bodies are suspended to the flange of the neck portion of the pipe section main body, and the both divided bodies are left suspended. Is sandwiched and connected to the flange of the pipe section main body from the circumferential direction. However, in the state where both the divided bodies are suspended, the two divided bodies are shaken. Therefore, it is difficult to align the respective divided bodies and the flanges, and the lower mounting member is hermetically sealed with respect to the flange of the pipe body. There was a problem that the work of attaching was complicated.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a valve body removal device capable of easily performing a hermetically attaching operation of an attaching member.

In order to solve the above-mentioned problem, the valve body removal device of the present invention includes:
For removing the valve main body of a valve device having a pipe main body connected to a fluid pipe and a valve main body capable of closing the pipe main body in an uninterrupted state using a working valve and a valve moving means. A valve body removal device,
A working case that surrounds the neck side that constitutes the conduit body, a mounting member that includes a plurality of divided bodies for fixing the working case to the neck portion in a sealed state, and a connection between the plurality of divided bodies Guiding means for guiding the divided body at a position is provided.
According to this feature, each divided body is guided to the connection position between the divided bodies by the guiding means, and the divided bodies are connected to each other at the connection position, so that the attachment member is sealed to the neck portion of the pipe body. Installation work can be performed easily.

The guide means is characterized in that the plurality of divided bodies can be held integrally so as to be movable.
According to this feature, since each divided body can be suspended and moved from the ground to the neck while holding each divided body, the installation work of the mounting member to the neck portion of the conduit section body can be easily performed. Can do.

The guide means includes a guide path for guiding the plurality of divided bodies to the connection position.
According to this feature, since each divided body can be guided to the connection position along the guide path, the mounting member can be installed more accurately.

The guide means is characterized in that the plurality of divided bodies can be placed and includes a moving smoothing portion that smoothly moves the plurality of divided bodies to the connection position.
According to this feature, each divided body can be placed on and supported by the guide means, and each divided body is smoothly guided to the connection position by the moving smooth portion, so that it can be attached to the neck portion of the pipe body. The centering operation with the member is extremely easy.

The guide means includes engaging portions that are provided in the respective divided bodies and engageable with each other.
According to this feature, each divided body can be guided to the connection position by engaging the engaging portions provided in each divided body.

It is a side view which shows the pipe line structure part embed | buried in an Example. It is a partial front sectional view which shows the aspect which assembled | attached the valve body removal apparatus with the gate valve apparatus. It is a side view which shows the state exchanged to the volt | bolt for work and the nut for work in the gate valve apparatus. (A) is a top view which shows the state which suspended and moved the division | segmentation structure to the neck part, (b) is a partial front sectional view similarly. (A) is a top view which shows the state which made the divided structures adjoin, (b) is a partial front sectional view similarly. It is a top view which shows the state which joined the divided structures. It is a partial front sectional view showing the state where split structures were joined. It is a partial sectional side view which shows the aspect which performs the fluid pressure test of a division | segmentation type attachment member. It is a partial front sectional view which shows the state which removed the existing valve main-body part with the valve body removal apparatus. It is a partial front sectional view which shows the aspect replaced with a new valve main-body part. It is a partial front sectional view showing a modification of the guide means. (A) is a top view which shows the modification of a guidance means, (b) is a partial sectional side view similarly.

  EMBODIMENT OF THE INVENTION The form for implementing the valve body removal apparatus which concerns on this invention is demonstrated below based on an Example.

  The valve body removal apparatus according to the embodiment will be described with reference to FIGS. Hereinafter, the front side of the screen in FIG. 2 will be described as the front side (front side) of the valve body removal device.

  As shown in FIG. 1, in this embodiment, a gate valve device 3 (valve device) capable of blocking a fluid pipe line is connected to existing fluid pipes 2 and 2 '. The fluid pipes 2 and 2 ′ and the gate valve device 3 are made of, for example, ductile cast iron for waterworks embedded in the ground, and the fluid pipes 2 and 2 ′ are formed in a substantially circular shape in cross section and have an inner peripheral surface. Is covered with a mortar layer. The fluid pipe and valve device according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In this embodiment, the fluid in the fluid pipe is clean water, but is not limited to clean water in this embodiment. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas-liquid mixture of gas and liquid It does not matter.

  As shown in FIG. 1, the gate valve device 3 includes a pipe body 4 and a valve body 11. The pipe part main body 4 protrudes in a direction different from the pipe axis of the pipe part 5, the pipe part 5 communicating with the fluid pipes 2, 2 ′, flange parts 9 and 9 ′ formed integrally with the pipe part 5, and the pipe part 5. And a cylindrical neck portion 8. The neck portion 8 includes an extended pipe portion 6 that extends upward from the pipe portion 5, and a pipe line flange 7 provided at the upper end of the extended pipe portion 6.

  The valve body 11 includes a valve body 12 (see FIG. 9) capable of closing the conduit body 4, a valve lid flange 13, a valve lid 14 formed integrally with the valve lid flange 13, The operation unit 15 is protruded from the upper surface and is used to open and close the gate valve device 3 from the outside. The operation unit 15 is attached / detached via a packing (not shown) for sealing the valve lid 14. It is possible to join. Further, the pipe body 4 and the valve body 11 are bolts and nuts via gasket rings (not shown) for sealing the pipe flange 7 and the valve lid flange 13 of the pipe body 4. .. Are detachably joined by 20, 20,.

  The gate valve device 3 and the fluid pipes 2 and 2 'are connected via connection pipes 16 and 16'. The connecting pipes 16 and 16 'are respectively provided with flange portions 17 and 17' at one end in the longitudinal direction, and receiving portions 18 and 18 'at the other end, and the flange portions 17 and 17' of the connecting pipes 16 and 16 ' The flange portions 9 and 9 'at both ends of the gate valve device 3 are joined together in a sealed manner via packing (not shown) and fastened with bolts, nuts 20, 20,. The fluid pipes 2 and 2 ′ are joined to the receiving portions 18 and 18 ′ of the connection pipes 16 and 16 ′ in a sealed manner via packing (not shown) by push wheels 19 and 19 ′ fixed to the ends. Yes. The fluid pipes 2 and 2 ', the pipe body 4 in the gate valve device 3, the connecting pipes 16 and 16', and the push wheels 19 and 19 'constitute a fluid pipe. Are collectively defined as a pipeline component. Further, in this embodiment, the members constituting the pipe line constituting portion are joined by a flange, joined by a receiving port and an inserted port, and joined using a push ring. However, welding or a seismic structure using a lock ring and a seal is used. Bonding or the like may be used. In addition, the member which comprises a pipe line structure part is not necessarily restricted to a present Example, For example, the pipe part main body 4 and the fluid pipes 2 and 2 'may be directly connected.

  As shown in FIG. 2, the valve body removal device 1 removes the valve main body portion 11 from the pipe portion main body 4, and a working case 21 that encloses a part of the gate valve device 3 in a sealed manner, A working valve 22 provided in the working case 21 and capable of partitioning the internal space of the working case 21 in a sealed manner by an operation from the outside of the working case 21, and the valve body 11 within the working case 21 A valve suspension moving tool 33 (valve moving means) that enables movement, a support device 43, 43 ′ (see FIG. 3) for supporting the work case 21 from the lower side, and divided structures 24, 25 described later. And guiding means for guiding to the connection position. The guidance means will be described in detail later.

  The work case 21 is mainly composed of a split attachment member 23, a mating flange 26, a work valve device 27, a cylindrical member 28, and an upper lid 29. A work valve device 27, which is a housing provided with the work valve 22, is connected to the upper portion of the flange portion 31 of the split mounting member 23 via a mating flange 26, and an upper flange of the work valve device 27. A cylindrical member 28 having an upper lid 29 connected to the upper end is connected to the upper end. Various members constituting the working case 21 are joined in a sealed manner via packing. The work case 21 preferably has a substantially cylindrical cross-sectional shape, but may be a cylindrical member having a substantially oval, substantially elliptical, or substantially rectangular cross-sectional shape, for example.

  As shown in FIG. 4, the split attachment member 23 includes split structures 24 and 25 that are split into two in the circumferential direction of the neck portion 8. As shown in FIG. 4B, the divided structures 24 and 25 described above are formed with plate-like projecting pieces 52 and 52 and projecting pieces 52 ′ and 52 ′, respectively, at positions separated from the respective joint ends. In addition, plate portions 53 and 53 ′ extending opposite to each other are provided at the bottoms of the protruding pieces 52 and 52 ′ that face each other. The front end portion 54 of the plate portion 53 and the concave portion 55 provided in the plate portion 53 'can be engaged with each other.

  As shown in FIG. 6, one split structure 24 includes an annular portion 56 inside the flange portion 31 of the split mounting member 23, and the annular portion 56 has a female screw portion on the inner peripheral surface. The non-through holes 46 and 46 are formed. Similarly, the other divided structure 25 includes an annular portion 56 ′, and non-through holes 46 ′ and 46 ′ are formed in the annular portion 56 ′. In these non-through holes 46 and 46 ′, auxiliary plates 47 and 47, which will be described later, are attached to the divided structures 24 and 25, and eyebolts 49 for hanging the divided structures 24 and 25 are respectively screwed. (See FIG. 4).

  As shown in the partially enlarged portion of FIG. 7, the split-type mounting member 23 has the inner peripheral surfaces of the split structures 24, 25 when the split structures 24, 25 are brought closer to the neck 8 from the circumferential direction. The sealing member 30 provided in each is pressed against the pipe line flange 7 and attached in a sealed manner. In addition, as the sealing member, a round rubber packing having a circular cross section, a substantially C-shaped or rectangular shape, or a rubber packing with a lip may be used.

  In addition, a communication hole 57 having a thread groove communicating from the outer peripheral side to the inner peripheral side is provided at a position corresponding to the upper surface of the valve lid flange 13 in the split mounting member 23. A flange upper fixing bolt 58 is screwed in a sealing manner. In addition, a communication hole 57 ′ is provided at a position corresponding to the lower surface of the pipe line flange 7 in the split mounting member 23, and a flange lower fixing bolt 59 is screwed into the communication hole 57 ′ in a sealing manner. It is inserted. The communication hole 57 'and the flange lower fixing bolt 59 may not be provided.

  As shown in FIG. 2, an insertion hole 32 that communicates from the upper surface side to the lower surface side is formed in the central portion of the upper lid 29. A valve suspension rod 34 for pulling up and removing the valve body 11 from the conduit body 4 can be inserted into the insertion hole 32, and is not shown between the upper lid 29 and the valve suspension rod 34. By interposing the sealing material, the inside of the work case 21 is sealed.

  The valve suspension moving tool 33 includes a valve suspension rod 34, an upper suspension fitting 35 fixed to the upper end of the valve suspension rod 34, and a lever hoist 36 fixed to the upper suspension fitting 35 and the cylindrical member 28 of the working case 21. , 36. The valve lid flange 13 (see FIG. 3) is removed from the pipe body 4 and the valve hoist is gradually lifted by operating the fluid pressure into the working case 21 and loosening the lever hoists 36, 36. The valve body 11 can be lifted by moving the rod 34 upward. In addition, when the lifting with the fluid pressure is insufficient, a lifting device such as a crane may be used. Further, as will be described later, the length of the valve suspension rod 34 is such that the tip of the valve suspension rod 34 reaches the vicinity of the upper end of the operation portion 15 of the valve main body portion 11 when the valve suspension rod 34 is most advanced into the work case 21. Thus, the lower end of the valve main body 11 is adjusted so as to reach the upper part of the work valve 22 when the valve main body 11 is moved back most to be separated from the conduit main body 4 by the valve suspension rod 34. .

  As shown in FIGS. 2 and 3, the support devices 43 and 43 ′ are disposed on the connection pipes 16 and 16 ′, respectively. The support device 43 mainly includes a leg portion 44 straddling the outer peripheral surface of the connecting pipe 16 in the circumferential direction and a pair of support portions 45, 45 provided on the upper portion of the leg portion 44. 45 can be moved up and down by a height adjusting mechanism (not shown). Since the support device 43 ′ has the same configuration as the support device 43, description of the support device 43 ′ is omitted.

  Next, a process of removing the valve body 11 using the valve body removal apparatus 1 and replacing it with a new valve body 11 'later will be described.

  First, as shown in FIG. 1, the ground is excavated to the vicinity of the center of the pipe axis of the pipe line constituting part. Thereafter, the exposed gate valve device 3 and its surrounding members are cleaned. In addition, it excavates until the whole gate valve apparatus 3 is exposed, and you may make it perform the attachment operation | work of the valve body removal apparatus 1 in a wide space.

  Subsequently, as shown in FIG. 3, bolts and nuts 20 for fastening the pipe body 4 and the valve body 11 are replaced with working bolts 37, 37,... And long working nuts 38, 38,. The cap 39 (see FIG. 1) of the valve main body 11 is replaced with an adapter 40 that can be engaged with the tip of the valve suspension rod 34 described above. In addition, packing for sealing the bolt hole (not shown) of the pipe line part flange 7 is incorporated in the working bolts 37, 37,. Furthermore, the bolt hole of the pipe line flange 7 may be sealed with a seal washer instead of packing.

  In this way, by replacing the long work nut 38, the work nut 38 can be accessed from the flange portion 31 side of the split mounting member 23, and disassembly and assembly work is facilitated. In addition, you may make it protrude from the flange part 31 side of the split-type attachment member 23 using a still longer working nut.

  Further, a part of the bolts and nuts 20, 20,... That fasten the pipe section main body 4 and the connection pipes 16, 16 ′ are replaced with long screw bolts 42, 42, and The support devices 43 and 43 ′ are attached to the base plate. When the support devices 43 and 43 ′ are attached to the connection pipes 16 and 16 ′, both end portions in the circumferential direction of the leg portions 44 and 44 of the support devices 43 and 43 ′ are mounted on the upper surfaces of the long screw bolts 42 and 42, respectively. Let me put it. This prevents the support devices 43 and 43 'from sliding and rotating in the circumferential direction of the connection pipes 16 and 16'.

  Further, when the support devices 43 and 43 'are attached to the connection pipes 16 and 16', the upper surfaces 45a and 45a of the support portions 45 and 45 are adjusted so as to be arranged at predetermined height positions. This predetermined height position means that the upper surface 45a, 45a of each support portion 45, 45 is formed at an appropriate height position with respect to the neck portion 8 of the pipe portion main body 4, and is divided. It is a position which can support the lower surface side.

  Next, as shown in FIG. 4, auxiliary plates 47 and 47 are fixedly attached to the divided structures 24 and 25 on the ground. The auxiliary plate 47 is formed of a rigid metal plate or the like, and long holes 48 extending in the longitudinal direction are formed at both ends thereof. As described above, since the auxiliary plate 47 is provided with the long holes 48 and 48, the divided structures 24 and 25 that move along the long holes 48 as described later while maintaining the strength of the auxiliary plate 47 itself. Can be regulated by the ends of the adjacent long holes 48, 48. The attachment mode of the auxiliary plates 47 and 47 will be described in detail. The non-through holes 46 and 46 'facing each other in the divided structures 24 and 25 are separated from each other in a state where the divided structures 24 and 25 are separated by a predetermined distance (see FIG. 6). Auxiliary plates 47, 47 are arranged so as to be bridged, and the eyebolts 49 are screwed into the respective non-through holes 46, 46 'through the respective long holes 48 and tightened, whereby the auxiliary plates 47, 47 are divided. It is fixedly attached to the bodies 24, 25. That is, the divided structures 24 and 25 are unitized by the auxiliary plates 47 and 47 in a state of being separated by a predetermined interval. As long as the auxiliary plate 47 has rigidity, the auxiliary plate 47 is not limited to a metal and may be formed of a member such as a resin, or may have a structure having a rib. Furthermore, the auxiliary plate may be provided with one long hole extending in the longitudinal direction at the center thereof.

  After that, the crane wires W and W are connected to the ring portions of the eyebolts 49 and suspended from the ground to the neck portion 8 of the pipe section main body 4, and the divided structures 24 and 25 are arranged on both sides of the neck portion 8. To do. As described above, since the divided structures 24 and 25 are unitized by the auxiliary plates 47 and 47, the divided structures 24 and 25 can be integrally suspended and moved. In the present embodiment, the wires W, W extend radially from the crane suspension (not shown) to the ring portions of the eyebolts 49.

  Next, as shown in FIG. 5, each eyebolt 49 is loosened and the divided structures 24 and 25 are moved in the approaching direction, and the bottom surfaces 53 a and 53 a ′ of the plate portions 53 and 53 ′ in the divided structures 24 and 25. Are placed on the upper surfaces 45a of the support portions 45, 45a. At this time, the divided structures 24 and 25 move so that the eyebolts 49 relatively approach each other along the long holes 48 of the auxiliary plates 47 and 47 having rigidity. Further, since the gravity works on the divided structures 24 and 25 in the vertically downward direction, that is, in the direction in which they are close to each other with the suspension portion of the crane as the center, the divided structures 24 and 25 can be moved with a small force.

  Then, the auxiliary plates 47, 47 are removed from the divided structures 24, 25, and as shown in FIG. 6, the divided structures 24, 25 are brought closer to each other on the support portions 45, 45 so that the divided structures 24, 25 joining ends are overlapped. As described above, since the weight of the divided structures 24 and 25 can be entrusted to the support portions 45 and 45, the joining work can be easily performed in a state where the divided structures 24 and 25 are stabilized. Note that the divided structures 24 and 25 may be pulled together by inserting bolts (not shown) across the projecting pieces 52 and 52 'facing each other and tightening the nuts.

  As shown in FIG. 7, when the joining ends of the divided structures 24 and 25 are overlapped with each other, the front end portion 54 of the plate portion 53 of the divided structure 24 and the concave portion of the plate portion 53 ′ of the divided structure 25. 55 is engaged. Thereby, the divided structures 24 and 25 are arranged at the connection positions of the divided structures 24 and 25 where the divided attachment member 23 is appropriately formed with respect to the neck portion 8 of the pipe section main body 4. Moreover, since the front-end | tip part 54 of the board part 53 and the recessed part 55 of board part 53 'are engaging, the possibility that the division | segmentation structures 24 and 25 may fall in the direction which separates can be prevented.

  Subsequently, a plurality of bolts 41, 41,... And nuts 50, 50,... (Only one is shown) are temporarily tightened on the protruding pieces 52, 52 and the protruding pieces 52 ′, 52 ′ facing each other. Then, the divided structures 24 and 25 arranged at the connection positions are temporarily fixed. Thereafter, the support portions 45, 45 are raised to correct the positions of the divided structures 24, 25, and the bolts 41, 41,... And the nuts 50, 50,. To do. In this way, the divided structures 24 and 25 are connected and fixed at the connection position, so that the split mounting member 23 is attached to each of the sealing members 30 with respect to the pipe line flange 7 of the neck part 8 of the pipe body 4. Therefore, it is very easy to seal and attach the split type mounting member 23. In addition, as shown with the dashed-two dotted line of FIG. 7, the separate auxiliary jacks 60 and 60 may be added and arrange | positioned and the division | segmentation type attachment member 23 may be supported more stably.

  As described above, in this case, the auxiliary plates 47 and 47, the support portions 45 and 45, the plate portion 53 and the plate portion 53 ′ are formed by dividing the divided structures 24 and 25 between the divided structures 24 and 25. The guide means for guiding to the connection position is configured, the long holes 48, 48, 48, 48 of the auxiliary plates 47, 47, the upper surfaces 45a, 45a of the support portions 45, 45, and the tip end portion of the plate portion 53. 54 and the recessed part 55 (engagement part) of board part 53 'are functioning as a guide path which guides the division structures 24 and 25 to a connection position.

  Next, as shown in the partially enlarged portion of FIG. 7, set screws 61, 61,... (Only one is shown) are tightened against the heads of the working bolts 37, 37,. Further, the valve lid flange 13 is pressed against the pipe portion flange 7 side by the flange upper fixing bolt 58 to ensure the sealing and holding of each portion and to remove the working nuts 38, 38,. At this time, the valve lid flange 13 and the pipe line flange 7 may be firmly held using the flange lower fixing bolt 59.

  Thereafter, as shown in FIG. 8, the mating flange 26 is attached to the flange portion 31 of the split mounting member 23, and a fluid injection pipe, a pressure gauge, and the like are provided to the mating flange 26. The fluid pressure lid 62 is attached, and the fluid pressure test inside the split attachment member 23 is performed. In addition, you may perform a fluid pressure test using the working valve 22 which comprises the valve body removal apparatus 1. FIG.

  Next, as shown in FIG. 9, the fluid pressure lid 62 (see FIG. 8) is removed from the mating flange 26, the valve suspension rod 34 is attached, and the work valve device 27 and the cylindrical member 28 are attached to the mating flange 26. Then, the work case 21 is configured by attaching the upper lid 29 assembled with the valve suspension moving tool 33 to the upper end of the cylindrical member 28. The work valve device 27, the cylindrical member 28, the upper lid 29, and the valve lifting / moving tool 33 may be assembled and integrated in advance, and may be fixed to the upper part of the split mounting member 23 at a time. Thereby, workability | operativity at a work site can be improved significantly.

  Next, a fluid is injected into the working case 21 so that the fluid pressure in the working case 21 and the inside of the pipe line structure are the same.

  Next, as shown in FIG. 9, the flange upper fixing bolts 58, 58 are retracted, and the upper nuts 51, 51,... (See FIG. 2) of the valve suspension moving tool 33 are loosened. The valve suspension rod 34 is moved upward to raise the valve body 11. At this time, by draining the fluid in the working case 21 from the drain 63, it is possible to discharge the foreign matter generated during the lifting operation of the valve main body 11 together with the fluid to the outside of the working case 21. After pulling up the valve main body 11, the work valve 22 is closed, and the cylindrical member 28, the upper lid 29, the valve suspension moving tool 33, and the valve main body 11 are removed from the work valve device 27. In addition, you may remove only the upper cover 29, the valve hanging movement tool 33, and the valve main-body part 11. FIG.

  In addition, after pulling up the valve body 11, the aforementioned gasket ring disposed between the valve body 11 and the pipe line flange 7 remains in the groove on the pipe flange 7 side. There is. When it is confirmed that the gasket ring remains through the confirmation window 64 provided on the split type attachment member 23, the position of the gasket ring is visually confirmed by the confirmation window 64. The removal of the gasket ring is performed using a removal rod 66 accessible to the pipe line flange 7 through the provided work hole 65 (see FIG. 9).

  Then, as shown in FIG. 10, the cylindrical member 28, the upper lid 29, and the valve suspension moving tool 33 are assembled to the work valve device 27. A new valve body 11 ′ is engaged with the valve suspension rod 34 of the valve suspension moving tool 33. An annular groove 67 is formed in the valve lid flange 13 ′ of the valve body 11 ′, and a gasket ring 68 having a thickness larger than that of the existing gasket ring is fixed to the groove 67. An annular metal plate 69 is placed on the upper end side of the valve lid flange 13 '.

  Next, fluid is injected into the cylindrical member 28 so that the fluid pressure in the cylindrical member 28 and the fluid pressure on the split-type mounting member 23 side are the same, the work valve 22 is opened, and the lever hoist 36 is operated. Then, the valve body 11 ′ is attached to the conduit body 4. Although not shown, the flange upper fixing bolt 58 is screwed to press the valve lid flange 13 ′ against the pipe line flange 7, and the upper suspension fitting 35, the upper lid 29, and the cylindrical member 28 are removed, and the valve suspension rod 34 is removed. To remove. Then, a work nut 38 is attached to the work bolt 37. Further, the upper fixing bolt 58 is released, the work valve device 27, the mating flange 26, the split mounting member 23, the support devices 43 and 43 ′, etc. are removed, and the work bolt 37 and the work nut 38 are replaced with bolts and nuts. After replacement, the adapter 40 is replaced with the cap 39, and the replacement operation to the valve body 11 ′ is completed.

  As described above, since the gasket ring 68 is thicker than the existing gasket ring, the existing gasket ring is arranged by being crushed when the valve lid flange 13 ′ is pressed against the pipe line flange 7 by the flange upper fixing bolt 58. The valve body 11 ′ and the pipe body 4 can be reliably sealed by entering the recessed groove on the pipe flange 7 side. Further, the flange upper fixing bolt 58 contacts the metal plate 69 of the valve lid flange 13 'to prevent the valve lid flange 13' from being damaged.

  In the above-described embodiment, the guide path includes the long holes 48, 48, 48, 48 of the auxiliary plates 47, 47, the upper surfaces 45 a, 45 a of the support portions 45, 45, the distal end portion 54 of the plate portion 53, and the like. Although the aspect comprised by the recessed part 55 of board part 53 'was demonstrated, each of upper surface 45a, 45a of each support part 45, 45 or the front-end | tip part 54 of board part 53, and the recessed part 55 of board part 53' Only one of them may be configured, and the other configuration may be omitted. Furthermore, the long holes 48 of the auxiliary plate 47 are formed so as to extend long so that the divided structures 24 and 25 can move to the connection position, and the upper surfaces 45a and 45a of the support portions 45 and 45, and the plate. You may abbreviate | omit the structure of the front-end | tip part 54 of the part 53, and the recessed part 55 of board part 53 '.

  Moreover, although the front-end | tip part 54 of the board part 53 and the recessed part 55 of board part 53 'were demonstrated as an engaging part which guides the division | segmentation structures 24 and 25 to a connection position, for example, the front-end | tip part 54 of the board part 53 divides | segments. An insertion portion is formed so as to extend toward the structure 25 side, and an insertion portion into which the distal end portion 54 of the plate portion 53 can be inserted is formed in the plate portion 53 ′, and an insertion portion between the distal end portion 54 of the plate portion 53 and the plate portion 53 ′. And the divided structures 24 and 25 may be guided to the connection position, or may be formed in a hook shape or the like that can be engaged with each other. Moreover, in the said Example, although plate part 53,53 was provided in the division | segmentation structure 24, and plate part 53 ', 53' was provided in the division | segmentation structure 25, plate part 53, Each of 53 'may be formed.

  As a modification of the guide means, a description will be given with reference to FIG. 11. The support device 80 includes rollers 85, 85,... That can rotate around rotation shafts 82, 82,. The provided roller member 83 is provided over the upper ends of the support portions 81 and 81 ′. According to this, the divided structures 24 and 25 are placed on the roller member 83, and the long bolts 84 and the nuts 50 and 50 are tightened to the opposing projecting pieces 52 and 52 ′, whereby the rollers 85 and 85,... Can roll to smoothly guide the divided structures 24, 25 to the connection positions. The roller member 83 is an example of a moving smooth portion for smoothly moving the divided structures 24 and 25 to the connection position. For example, the upper ends of the support portions of the support device are connected by a flat plate material, The upper surface of the flat plate material may be mirror-finished, or a low friction material such as resin may be used as a material to reduce the frictional force so that the divided structures 24, 25 and the flat plate material slide smoothly. . In this case, the auxiliary plate 47 may not be used.

  Further, as a modified example of the guide means, a description will be given with reference to FIG. 12A. Guide pieces 90 and 90 ′ for guiding the divided structures 24 and 25 to the connection position are provided on the upper surface of the valve lid flange 13. Is provided. The guide pieces 90, 90 'are formed of a rigid metal plate or the like, and are attached by being sandwiched between the upper surface of the valve lid flange 13 and the working bolts 37, 37,. Further, as shown in FIG. 12B, projecting pieces 91 and 91 are provided on the inner peripheral surface side of the divided structures 24 and 25, and the projecting pieces 91 and 91 are guide pieces 90 and 90, respectively. It is possible to support the divided structures 24 and 25 by being placed on the upper surface of 'and to slide the projecting pieces 91 and 91 along the upper surfaces of the guide pieces 90 and 90'. Can be guided to the connection position.

  Although not shown in the drawings, a protrusion is provided at a predetermined position of each of the divided structural bodies 24 and 25, and a fixture having an insertion port into which the protrusion can be inserted is fixedly installed at a predetermined position on the neck 8, The divided structures 24 and 25 may be arranged at the connection positions by inserting the protrusions of the divided structures 24 and 25 into the insertion ports of the fixture.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the split-type attachment member 23 has been described with respect to the split structure bodies 24 and 25 that are split into two in the circumferential direction of the neck portion 8. However, the split mount member 23 includes three or more split structure bodies. May be. Further, in the working case, if the mounting member is a divided structure, other various members may be integrated by welding or the like. Furthermore, the working case may be configured by a plurality of divided structures integrated vertically.

  In this embodiment, the valve device is a gate valve, but a butterfly valve, a switching valve, a ball valve, a plug, or the like may be used.

  In this embodiment, the existing valve body 11 is removed and replaced with a new valve body 11 ′. However, it may be replaced with a pipe connection member such as a closing lid or other air valve.

1 Valve body removal device 2, 2 'Fluid pipe 3 Gate valve device (valve device)
4 Pipe section body 8 Neck section 11, 11 ′ Valve body section 21 Work case 22 Work valve 23 Split type mounting member (mounting member)
24,25 Divided structure (divided body)
26 Fitting flange 27 Work valve device 33 Valve suspension moving tool (valve moving means)
43, 43 'support device 45 support part (guide means)
47 Auxiliary plate (guide means)
48 long hole (guideway)
49 Eyebolt 53, 53 'Plate part (guide means)
54 End of plate (engagement part)
55 Recessed part of plate (engagement part, guideway)
80 Support devices 81, 81 ′ Support portion 83 Roller member (guide means, moving smooth portion)
90, 90 'guide piece (guide means, guide way)

Claims (5)

For removing the valve main body of a valve device having a pipe main body connected to a fluid pipe and a valve main body capable of closing the pipe main body in an uninterrupted state using a working valve and a valve moving means. A valve body removal device,
A working case that surrounds the neck side that constitutes the conduit body, a mounting member that includes a plurality of divided bodies for fixing the working case to the neck portion in a sealed state, and a connection between the plurality of divided bodies And a guide means for guiding the divided body at a position.   The valve body removing device according to claim 1, wherein the guide means is capable of holding the plurality of divided bodies integrally so as to be movable.   3. The valve body removing device according to claim 1, wherein the guide unit includes a guide path that guides the plurality of divided bodies to the connection position. 4.   The said guide means can mount the said some division body, and is provided with the movement smooth part which makes a movement to the said connection position of this some division body smooth. The valve body removal apparatus in any one of.   The valve body removing device according to any one of claims 1 to 4, wherein the guide means includes engaging portions that are provided in the respective divided bodies and are engageable with each other.

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