JP2016161083A - Working jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working jig used for a working operation for fixing a working case against a neck part of a pipe passage main body of a valve device while keeping non-cutoff flow condition at the pipe passage so as to support the working case under its stable state at the neck part of the pipe passage main body of the valve device acting as a limited space and in particular even under a case in which the pipe passage main body for fixing the working case is inclined along the existing fluid pipe, it is possible to eliminate a possibility of removal from the fitted state of the working case and to perform the working safely.SOLUTION: This invention relates to a working jig 43 used for a working operation under non-cutoff flow condition of a valve device 3 forming a part of pipe passage constitution segments 2, 2', and 5 and used for fixing a working case 21 to a neck part 8 of the valve device 3. This jig includes a held segment 44 abutted along the outer circumferences of the pipe passage constitution segments 2, 2', and 5, held under no-positional displacement and arranged while holding the neck part 8 of the valve device 3 and load supporting segments 45 each of which is arranged on the held segment 44 holding the neck part 8 so as to support a load of the working case 21.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a working jig used in various operations on an existing fluid pipe such as removing a valve body of a valve device connected to the existing fluid pipe in an uninterrupted state.

Some existing fluid pipes such as a water main pipe are provided with a valve device such as a gate valve so that the fluid pipe of the existing fluid pipe can be shut off. Such a valve device includes a conduit main body connected to an existing fluid pipe and a valve main body including a valve body, an operation shaft, and the like, and constitutes a pipe together with the existing fluid pipe.
If the valve main body has deteriorated over time, remove the valve main body only, leaving the pipe main body, so that the valve device can be used only as a fluid conduit or to be reused as a valve device in the future. Removal work is being carried out.

  As such a construction method, the flange portion of the annular lower mounting frame member is fixed by sandwiching the two divided bodies from the circumferential direction with respect to the neck portion of the pipe portion main body of the valve device that is exposed by excavating the buried ground. (Attachment part) is formed, and a work housing (working case) having an upper mounting frame material, a work on-off valve, and a lifting and lowering conveying means (valve pulling means) is connected to the lower mounting frame material. There is a work housing that seals the valve main body side of the pipe section main body in a sealed manner, and the lift main body is operated within the working housing to remove the valve main body from the pipe main body (for example, Patent Document 1).

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

In the valve body removal method disclosed in Patent Document 1, an attachment frame member is fixed to the neck portion of the pipe portion main body of the valve device, and a limited space called a flange portion constituted by the attachment frame member is used. The work case, which is a heavy object, is temporarily placed in a suspended state, positioned at a predetermined position, and then fixed by a fixing means such as a bolt.
When the working case is attached to the flange portion provided in the valve device in this way, the fastening strength of the bolt that is a fixing means for fixing the heavy work case is required. Since the space at the neck of the road body is limited, it is difficult to increase the size of the fixing bolts or increase the quantity, and it is difficult to fix the work case in a stable state. It was.

In particular, when existing fluid pipes are installed obliquely with respect to the horizontal plane in order to form natural flow paths or flow paths on slopes, the existing fluid pipes are unequal due to secular changes after burial. In the case of tilting obliquely because of sinking, the valve device that constitutes the fluid pipe line with the existing fluid pipe is also tilted along the existing fluid pipe. When the work case is loaded on the flange portion, which is the neck portion, a moment load that tends to tilt the work case is generated due to the inclination of the center of gravity line of the work case.
In order to support this moment load, a local load is applied to a part of the bolt or the like that is a fixing means to the flange portion, and there is a possibility that the work case may be detached during the work by breaking the bolt or the like. There was a problem.

  The present invention has been made paying attention to such a problem, and in the work of attaching the working case to the neck portion of the pipe section main body of the valve device while maintaining the continuous flow state of the pipe line, the limited space is limited. The work case is stably supported on the neck of the pipe body of the valve device, and even if the pipe body for attaching the work case is inclined along the existing fluid pipe, It is an object of the present invention to provide a working jig that can eliminate the risk of detachment of the working case and can work safely.

In order to solve the above problems, the working jig of the present invention is:
A working jig for attaching a working case to a neck portion of the valve device, which is used for work in an uninterrupted flow state of a valve device forming a part of the pipe constituting portion, and an outer periphery of the pipe constituting portion And a held portion that is held in contact with each other so as not to be misaligned and sandwiched between the neck portions of the valve device, and supports the load of the working case that is disposed on the held portions that sandwich the neck portions. And a load support portion.
According to this feature, in the work of attaching the work case that is attached to the valve body of the valve device that is performed while maintaining an uninterrupted flow state of the pipe line, the pipe case is in contact with the outer peripheral part of the pipe line constituting part. It has a held part that is held so that it cannot be displaced and is placed across the neck of the valve device, and has a load support part that is arranged on the held part and supports the load of the work case. Therefore, when attaching the work case, the work case can be firmly supported without causing a positional shift with respect to the pipeline component, and the bolt is a means for fixing the work case to the neck of the valve device. It can be supported in a stable state without increasing the size or increasing the number of bolts.

The to-be-held part is latched and held by the installation part formed in the said pipe line structure part, It is characterized by the above-mentioned.
According to this feature, since the work jig provided in the pipe line constituent part is locked to the installation part of the pipe line constituent part, when the work jig supports the load of the work case, It can be firmly supported without causing misalignment.

It has the positioning means which positions the said work case by uneven | corrugated fitting, It is characterized by the above-mentioned.
According to this feature, since the position of the work case attached to the valve device can be determined by guiding it from the state suspended by the crane by guiding the uneven portions, the suspended work case can be slightly shaken. Even if it exists, work efficiency can be ensured.

The load support part has the positioning means.
According to this feature, positioning can be performed at a place where the load is supported, so that the work efficiency when the work case is attached can be improved, and when the valve device is tilted, the uneven portion is used for work. The position shift can be suppressed while supporting a part of the inclined load of the case.

The held part is characterized in that the neck part is held across the pipe axis direction of the pipe line constituting part.
According to this feature, since the held portion is held across the neck of the valve device in the pipe axis direction, the work jig is held on the pipe line configuration portion around the valve device, When the working case is attached, the load is supported by the pipe line forming portion around the valve device, so that the working case can be supported in a stable posture.

With the valve device as a reference, it has a load receiving portion that receives an uneven load of the working case at a position spaced apart from the load supporting portion in the pipe axis direction of the pipe line constituting portion. .
According to this feature, even if the pipe line component member is greatly inclined, the load is received at a position away from the mounting surface with respect to a moment load (bias load) that is intended to incline the work case. Therefore, the work case can be supported in a more stable state, and work safety can be improved.

It is a side view which shows the pipe line structure part embed | buried in an Example. It is the partial front sectional view seen from the direction of Drawing 1A which shows the mode which attached the valve body removal device to the gate valve device. (A) is a top view of the working jig in the embodiment, (b) is also a side view, and (c) is a front view. (A) is a side view which shows the state exchanged to the work volt | bolt and the work nut in the gate valve apparatus, (b) is the front view similarly seen from the FIG. 1A direction. (A) is a top view which shows the state which suspended and moved the division | segmentation structure to the neck part, (b) is the partial front sectional view similarly seen from FIG. 1A direction. It is the partial front sectional view seen from the direction of Drawing 1A which shows the state where division structure was 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 the partial front sectional view seen from the direction of Drawing 1A which shows the state where the existing valve body part was removed by the valve body removal device. It is a partial side sectional view showing a mode in which an expansion / contraction member is arranged on an auxiliary load receiver in a state where a work valve device is attached to a split attachment member. It is the partial front sectional view seen from the 1A direction which shows the mode which removes the remaining gasket ring. It is the partial front sectional view seen from the direction of Drawing 1A which shows the mode exchanged for a new valve body part. It is a partial side surface sectional view of the valve body removal apparatus containing the modification 1 of a working jig. (A) is a top view in the modification 1 of a working jig, (b) is a side view, (c) is a front view. It is a side view which shows the pipe line structure part holding the modification 2 of a working jig. (A) is a top view in the modification 2 of a working jig, (b) is a side view, (c) is a front view. It is a side view which shows the pipe line structure part holding the modification 3 of a working jig. It is a side view showing a pipe line composition part holding modification 4 of a work jig.

  EMBODIMENT OF THE INVENTION The form for implementing the working jig concerning this invention is demonstrated below based on an Example.

  A support device that is a working jig according to an embodiment will be described with reference to FIGS. Hereinafter, the left side of FIG. 1 will be described as the upstream side of the support device.

As shown in FIG. 1, in this embodiment, a gate valve device 3 (valve device) capable of blocking the fluid pipe line is connected to the existing fluid pipes 2 and 2 ′. In the present embodiment, the existing fluid pipes 2 and 2 ′ and the valve device 3 are inclined at a predetermined angle with respect to the horizontal plane, but the fluid pipe and the valve device are not necessarily inclined. It is not restricted and may be arrange | positioned in parallel with a horizontal surface.
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 section main body 4 includes a pipe section 5 that communicates with the fluid pipes 2 and 2 ′, and a cylindrical neck section 8 that protrudes in a direction different from the tube axis of the pipe section 5. Both end portions of the tube portion 5 are formed as receiving portions 9, 9 'into which the ends of the fluid tubes 2, 2' can be inserted. The receiving portions 9, 9 'include the receiving portions 9, 9'. When inserting the fluid pipes 2 and 2 ′, a pair of flange parts 70 and 70 (equipment parts) used for drawing the fluid pipes 2 and 2 ′ are provided. The pair of collar portions 70, 70 are disposed so as to face both sides in the circumferential direction across the neck portion 8, and project substantially horizontally outward from the outer peripheral surfaces of the receiving portion 9 and the receiving portion 9 ′. (See FIG. 2). 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. Further, the neck portion 8 is provided with ribs 71 and 71 (installation portions) extending from the conduit portion flange 7 to the receiving portions 9 and 9 ′, and the strength of the conduit portion main body 4 is increased by the ribs 71 and 71. It is high. In addition, the fluid pipes 2 and 2 'and the pipe part 5 of the pipe part main body 4 in the gate valve device 3 constitute a fluid pipe line. Define.
Further, in this embodiment, the members constituting the pipe line forming portion are joined by a receiving port and a receiving port incorporating a lock ring and a seal, but are joined by a flange, joined using a push ring, and welded. Bonding or the like may be used.

  The valve body 11 includes a valve body 12 (see FIG. 8) 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,.

  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 It is comprised from the valve suspension movement tool 33 (valve moving means) which enables a movement, and the support apparatus 43 which supports the work case 21 from the downward side.

  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. 5, 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. 5, the divided structures 24 and 25 described above have plate-like protruding pieces 52 and 52 and protruding pieces 52 ′ and 52 ′ formed at positions away from the respective joining end portions. Plate portions 53 and 53 'extending opposite to each other are provided at the bottoms of the projecting pieces 52 and 52' facing 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.

  In addition, the front-end | tip part 54 of the board part 53 and the recessed part 55 of board | plate part 53 'are not restricted to the said aspect, For example, it forms so that the front-end | tip part 54 of the board part 53 may extend to the division structure 25 side, and the board part 53 is formed. The split structure 24, 25 is formed by forming an insertion portion into which the tip portion 54 of the plate portion 53 can be inserted and sliding the tip portion 54 of the plate portion 53 and the insertion portion of the plate portion 53 ′. You may make it guide to a connection position and you may form in the hook shape etc. which can be mutually engaged. 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.

In addition, the split structure 25 is provided with a jack portion 74 that can be expanded and contracted in the vertical direction. The jack portion 74 has a projecting portion projecting downward, has a structure capable of adjusting the height, and can handle the load of the work case 21 including the split mounting member 23 formed by combining the split structures 24 and 25. , Function as a support portion for transmitting to the support device 43.
Note that the jack portion 74 may be provided only in one of the divided structures 24 and 25, or may be provided in either of the divided structures 24 and 25. Moreover, the jack part 74 may be provided in the support device 43.

  As shown in the partially enlarged view of FIG. 6, the split-type mounting member 23 has the inner peripheral surfaces of the split structures 24 and 25 when the split structures 24 and 25 are brought close to the neck portion 8 in 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. And consist of By removing the valve lid flange 13 (see FIG. 4) from the pipe body 4 and using the fluid pressure into the work case 21 and loosening the lever hoist 36, the valve suspension rod 34 is gradually moved. The valve body 11 can be lifted by moving the valve 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 FIG. 2 and FIG. 4, the support device 43 is arranged on the outer peripheral surface upper side of the receiving ports 9, 9 ′ of the pipe part 5 at a position on the outer diameter side of the neck part 8. According to this, the support device 43 can stably support the lower side of the work case 21 from the position on the outer diameter side of the neck portion 8. Further, since the support device 43 is mounted on the upper outer peripheral surface of the receiving port portions 9 and 9 ′, the support device 43 is simply excavated to such an extent that the upper outer peripheral surface of the receiving port portions 9 and 9 ′ is exposed. It can be installed and the time and labor required for excavation work can be reduced. The support device 43 is not limited to support the lower side of the work case 21 but may support the upper side or the center side of the work case 21.

  Specifically, as shown in FIG. 2 and FIG. 3, the support device 43 that is a working jig according to the present embodiment straddles the outer peripheral surface of the receiving portion 9 in the circumferential direction and is held by the pipeline constituent member. And a pair of support portions 45 and 45 which are provided on the upper portion of the leg portion 44 and are load support portions, and in the present embodiment so as to project to the downstream side of the fluid pipe 2 ′. An auxiliary load receiver 75 provided at the end portion is mainly constituted. The leg portion 44 is configured to be fastened in the tube axis direction by a fastening portion 44b in a state where base members 44a and 44a having substantially the same shape are arranged oppositely symmetrically in the horizontal direction of FIG. Moreover, the leg part 44 is provided with the concave curved surface contact surface 44c which can be surface-contacted to the outer peripheral surface of the receptacle part 9, and the contact surface 44c is comprised by elastic members 72, such as rubber | gum. (See especially FIG. 3 (c)). According to this, since the elastic member 72 is interposed between the outer peripheral surface of the receiving portion 9 and the contact surface 44c of the supporting device 43, damage to the receiving portion 9 or the supporting device 43 is prevented. Even when the outer diameter of the receiving portion 9 is uneven, the elastic member 72 is elastically deformed to fill the gap between the outer peripheral surface of the receiving portion 9 and the contact surface 44 c of the support device 43. Therefore, the variation can be allowed to some extent. In this embodiment, the elastic member 72 is fixed to the leg portion 44, but the elastic member 72 may be provided separately from the support device 43, or vulcanized or out of the leg portion 44. It may be integrally formed by sart molding or the like, and the leg itself may be formed of an elastic material.

  Further, at the center of the leg portion 44 in the circumferential direction, the slit portion has a long side along the pipe axis direction of the pipe line constituent part and a short side along the outer peripheral direction of the pipe line constituent part, facing each other. 73 and 73 are provided, and the slit portions 73 and 73 are locked to a rib 71 which is an installation portion of the pipeline constituting portion as will be described later.

  Further, the leg portion 44 is provided with a fixing portion 44d which is a fixing means for the pipe portion main body. In this embodiment, the fixing portion 44d is constituted by a through hole and a set screw. As will be described later, the leg portion 44 is fastened and fixed to the pipe portion main body by the fixing portion 44d, so that it is fixed without being displaced when the load of the work case 21 is supported.

Further, support portions 45, 45 are provided on the upper portion of the leg portion 44. Here, the support device 43 is arranged at the upper part of the pipe line configuration portion so as to be axisymmetric at the center of the pipe axis. Further, as shown in the partial enlarged view of FIG. 3, the support portions 45, 45 have a recess 45a (positioning means) composed of a placement surface 45b and a wall portion 45c, and are divided as described later. By engaging the jack portion 74 of the mounting member 23 with the concave and convex portions, the position of the work case 21 including the split type mounting member 23 can be accurately fixed.
Further, as shown in FIGS. 3 and 8, the auxiliary load receiver 75 of the support device 43 is described later when the fluid pipes 2, 2 ′ and the pipe part 5, which are mainly pipeline constituent parts, are inclined. It is provided to receive the moment load generated by the inclination along with the expansion / contraction member 76 whose length can be adjusted by expansion / contraction.

  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. The ground may be excavated until the entire gate valve device 3 is exposed, or may be excavated along the pipe axis of the pipe line constituting part.

  Next, as shown in FIG. 4, bolts and nuts 20 (see FIG. 1) for fastening the pipe body 4 and the valve body 11 are replaced with working bolts 37, 37,. 38, 38,..., And the cap 39 (see FIG. 1) of the valve 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 with the long work nut 38, the work nut 38 can be accessed from the flange portion 31 (see FIG. 2) side of the split mounting member 23, and the 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, the support device 43 is attached on the outer peripheral surface of the receiving portions 9 and 9 ′. At this time, the support device 43 fastens the fastening portion 44b in the tube axis direction to the base members 44a and 44a that are mounted so as to face each other so as to sandwich the neck portion 8 of the gate valve device 3 in the tube axis direction. Can be installed. Here, each base member 44a has a slit portion 73, and when the base members 44a and 44a are attached to predetermined positions, the slit portions 73 and 73 are disposed at opposing positions, and the slit portions 73 and 73 are partitioned. Engage with the ribs 71 and 71 previously installed on the neck portion 8 of the valve device 3, and the support device 43 is locked and held by the pipe line constituting portion. As a result, the support device 43 is prevented from sliding and rotating in the circumferential direction of the receiving port portions 9 and 9 ′, and is also held in the tube axis direction of the pipe line constituting portion to prevent sliding movement. . In addition, in this state, the state in which the positional displacement is not possible includes that there is a slight gap between the pipe structure portion and the support device 43, thereby causing a dimensional tolerance or an error caused by an installation operation. Can be absorbed.

  Thereafter, the position is firmly fixed by tightening the set screw of the fixing portion 44d. According to this configuration, the support device 43 can be easily attached to the pipeline component and the position is firmly fixed, so that the support device 43 can be easily attached to the pipeline component.

  Next, as shown in FIG. 5, 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 auxiliary plate 47 is inserted between the opposing through-holes 46 and 46 ′ of the divided structures 24 and 25 in a state where the divided structures 24 and 25 are spaced apart from each other by a predetermined distance. 47, and the auxiliary plates 47, 47 are attached to the divided structures 24, 25 by screwing eyebolts 49 into the respective non-through holes 46, 46 'through the long holes 48 and tightening them. On the other hand, it is fixedly installed. 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.

The long holes 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 long holes of the auxiliary plates 47 and 47 and the support portions 45 and 45 are formed. The divided structures 24 and 25 may be guided to the connection position by the upper surface of 45.
Further, the divided structures 24 and 25 may be drawn together by inserting bolts (not shown) over the projecting pieces 52 and 52 'facing each other and tightening the nuts.

  Thereafter, crane wires W, W (not shown) are connected to the ring portions of the eyebolts 49 and are suspended and moved from the ground to the neck portion 8 of the pipe body 4 to sandwich the neck portions 8 of the divided structures 24, 25. To place. 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, each eyebolt 49 is loosened, and the divided structures 24 and 25 are moved in the approaching direction. At this time, in the divided structures 24 and 25, the eyebolts 49 move along the long holes 48 of the rigid auxiliary plates 47 and 47, so that the relative displacement between the divided structures 24 and 25 is restricted. While moving as one, it moves. 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 divided structures 24 and 25 are brought closer to each other, the joining end portions of the divided structures 24 and 25 are overlapped with each other, tightened with bolts and nuts 41 and 50, and the auxiliary plates 47 and 47 are attached from the divided structures 24 and 25. Although it may remain attached, it is removed here, and the jack portion 74 is positioned while being concavo-convexly engaged with the concave portion 45a provided in the support portion 45 of the support device 43, and installed on the mounting surface 45b. Here, since the wall portion 45c of the recess 45a serves as a guide for mounting the split-type attachment member 23 composed of the split structural bodies 24, 25 while placing it on the mounting surface 45b, the work case 21 is used as a crane. Even if it is in an unstable state suspended by a, it can be easily installed at a predetermined position.
At this time, the length of each jack portion 74 in the vertical direction is adjusted to a desired length. This desired length is a length that can support the split attachment member 23 attached to the neck portion 8 of the valve device 3 at an appropriate position with respect to the height position of the mounting surface 45b of each support portion 45, 45. is there. Thus, by supporting the split attachment member 23 composed of the divided structures 24 and 25 suspended from the ground at a position closer to the outer diameter side than the neck 8, the support is more stable than that supported by the attachment surface of the neck 8. In addition to being able to support, it is not necessary to support the entire load of the work case 21 at the neck 8 of the valve device 3, so the size of the bolt as a fixing means when attaching the work case 21 to the neck 8 is increased. However, the work case 21 can be attached in a stable state without increasing the number of bolts.
Further, as in this embodiment, even when the pipe body 4 is inclined and a moment load is applied to incline the work case including the divided structures 24 and 25, the valve device 3 is sandwiched therebetween. Since the plurality of support portions 45, 45 receive a moment load, it is possible to eliminate the possibility of the work case 21 being detached without applying a local load to the fixing bolt of the work case 21.
Furthermore, since the support portions 45 and 45 are provided symmetrically across the tube axis of the pipe line constituting portion, the load of the work case 21 that is circumferentially installed so as to surround the valve device 3 is the tube axis. Since the load is received by the mounting surface 45b provided symmetrically, the load of the work case 21 is not biased in the circumferential direction of the pipe line constituting portion, and can be supported in a stable state.
In the present embodiment, since the pipe line constituting portion is inclined at a predetermined inclination angle with respect to the horizontal plane, the wall portion 45c of the concave portion 45a as the positioning means supports the load generated by the inclination while positioning. .
In this embodiment, the concave portion 45a of the positioning portion is constituted by the mounting surface 45b and the wall portion 45c. However, the concave portion is not limited to this shape, and may be a conical hole having a taper. There may be more than one, and the mounting surface that receives the load may be the top surface of the recess surrounding the bottom surface instead of the bottom surface of the recess. In these cases, the jack portion which is the counterpart of the unevenness is formed with an uneven shape that fits in accordance with each shape.
In addition, if the jack part 74 is positioned by extending and contracting in the vertical direction, the uneven shape may not be provided.

  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. As shown in FIG. 2, separate auxiliary jacks 60, 60 may be additionally arranged to support the split mounting member 23 more stably.

  Next, as shown in the partially enlarged portion of FIG. 6, set screws 61, 61,... (Only one 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. 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. 7, 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. 8, the fluid pressure lid 62 (see FIG. 7) is removed from the mating flange 26, the valve suspension rod 34 is attached, the work valve device 27 is attached to the mating flange 26, and the work nut 38 is removed. The cylindrical member 28 is attached. Then, the work lid 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. Needless to say, the valve suspension moving device 33 may be assembled after the upper lid 29 is assembled.
Here, as shown in FIG. 9, when the work valve device 27 is attached to the mating flange 26, the telescopic member 76 is arranged to engage with the auxiliary load receiver 75 of the support device 43 in the inclined direction. To do. Thus, the momentary load generated by the inclination of the work case 21 including the work valve device 27 can be received by the telescopic member 76 and the auxiliary load receiver 75, and even if the inclination is large, the moment generated thereby The local load is applied to the fixing bolt by the load, and the possibility that the working case 21 collapses can be eliminated. In this case, the auxiliary load receiver 75 and the elastic member 76 function as a load receiver.
The expansion / contraction member 76 can be expanded and contracted to an arbitrary length, and is installed so as to be rotatable relative to the work valve device 27. Therefore, the work case 21 including the work valve device 27 is tilted and receives an auxiliary load. By adjusting the length and angle of the expansion / contraction member 76 in accordance with the position 75, the positional relationship can be finely adjusted, whereby the auxiliary load receiver 75 and the expansion / contraction member as a load receiving portion at an appropriate position. 76 can be attached.
In the present embodiment, since the telescopic member 76 is installed to be inclined with respect to the work case 21, the work case can be effectively supported against a moment load that tends to tilt the work case. Thereby, although the work case can be supported in a stable state, the present invention is not limited to this, and the elastic member 76 may be installed in parallel with the work case.

  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. 8, 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. As shown in FIG. 10, when it is confirmed that the gasket ring remains through the confirmation window 64 provided on the split type mounting member 23, the flange device 80 for removing the gasket ring is provided to the work valve device 27. And the pipe ring through the work hole 65 provided in the split mounting member 23 while visually confirming the position of the gasket ring by the upper confirmation window 81 and the confirmation window 64 of the flange device 80. By using the detaching rod 66 accessible to the flange portion 7 and the upper detaching rod 82 with the carabiner that constitutes the flange device 80, the work of removing the gasket ring while preventing it from dropping is performed.

  Then, as shown in FIG. 11, 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 device 43 and the like are removed, and the work bolt 37 and the work nut 38 are replaced with bolts and nuts, 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.

As a first modification of the support device, a description will be given with reference to FIGS. 12 and 13. Connection pipes 16 and 16 ′ are disposed between the pipe body 4 and the fluid pipes 2 and 2 ′. The flange portions 17 and 17 of the connecting pipes 16 and 16 'and the flange portions 18 and 18 of the pipe portion 5 are fastened by bolts and nuts 20, 20,. In this case, the connecting pipes 16, 16 ′ also form a pipe line constituent part together with the fluid pipes 2, 2 ′ and the pipe part 5 of the pipe part main body 4.
Then, a part of the bolts and nuts 20, 20,... Is replaced with long screw bolts 42, 42 (installation portion), and the mounting portions 173 of the support devices 431, 431 ′ are placed on the upper surfaces of the long screw bolts 42, 42. 173, the support devices 431 and 431 ′ may be arranged on the outer peripheral surfaces of the connection pipes 16 and 16 ′, respectively.

  Further, the auxiliary load receiver 75 is provided separately from the leg portion 44, the installation position of the expansion / contraction member 76 is engaged with the cylindrical member 28, and the eyebolt 78 attached to the upstream flange portion 17 and the work valve device 27, respectively. By attaching the tensioner 77 to the tube and receiving a tensile load, a moment load due to the inclination of the work case 21 can be simultaneously received. In this case, the auxiliary load receiver 75 and the expansion / contraction member 76 function as a load receiving portion that receives a compressive load, and the tensioner 77 and the eyebolt 78 function as a load receiving portion that receives a tensile load. Note that, like the support devices 431 and 431 ′, the support portion 45 may not have the recess 45 a.

  Further, as a second modification of the support device, the support device 432 includes surface abutting portions 79 and 79 that can abut on the flange portions 70 and 70, with reference to FIGS. 14 and 15. As a result, the surface abutting portions 79 and 79 abut on the upper surfaces of the flange portions 70 and 70, thereby preventing the rotation of the pipe constituting portion of the support device 432 in the circumferential direction.

  Further, the support device 432 has four support portions 45 in total, two on the left and two on the left, and each is arranged substantially symmetrically with respect to the tube axis of the cylindrical pipe constituting member. For this reason, the posture of the work case 21 can be stabilized.

  Further, as a third modification of the support device, a description will be given with reference to FIG. 16. One end of the pipe part 5 is a receiving part 90 connected to the fluid pipe 2, and the other end of the pipe part 5 The side end portion is an insertion portion 90 ′ connected to the receiving port-shaped fluid pipe 200. The support device 433 is attached to the outer peripheral surfaces of the receiving port 90 and the insertion port 90 '. Since the diameter of the receiving portion 90 is different from the diameter of the insertion portion 90 ′, the height positions of the left and right support portions 45 of the support device 433 are different, but the split mounting member 23 positioned on the support portion 45 is different. By adjusting the height of the jack portion 74 (not shown), it is possible to cope with pipes having different diameters.

  Further, as a fourth modification of the support device, a description will be given with reference to FIG. 17. The support devices 434 and 434 ′ are fixed to each leg portion 44, 44 having a female screw portion (not shown) on the inner peripheral surface. Parts 44d and 44d are provided. The support device 434 is disposed in the fluid pipe 2, the support device 434 ′ is disposed in the insertion portion 90 ′ of the tube portion 5, and the support devices 434, 434 ′ have bolts 178, 178 on the fixing portions 44 d, 44 d. It is attached to the fluid pipe 2 and the pipe part 5 by being screwed. Thus, although not shown, the tip portions of the bolts 178 and 178 are bitten on the outer peripheral surfaces of the fluid pipe 2 and the pipe portion 5, and concave portions (equipment portions) are formed on the outer peripheral surfaces of the fluid pipe 2 and the pipe portion 5. And the support devices 434 and 434 ′ may be attached to the fluid pipe 2 and the pipe part 5, respectively, by locking the tips of the bolts 178 and 178 in the respective recesses.

  Although not shown, the support device may be a split-type fixture that is fixed by biting a bolt or the like into the neck portion 8. Further, the support device is not limited to be disposed only on the upper outer peripheral surface of the pipe line configuration portion. For example, the support device may be attached such that its leg portion is continuous over the circumferential direction of the pipe portion 5. Good.

  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.

  Further, the work case 21 is not necessarily provided with the split-type attachment member 23. For example, an annular taper surface that is reduced in diameter upward is provided on the inner peripheral surface of the work case 21, and the taper surface is provided. It may be formed from a single member as long as it can be attached to the neck portion 8 in a sealed manner by being brought into sliding contact with the pipe line flange 7.

  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 (pipe line component)
3 Gate valve device (valve device)
4 Pipe section body 5 Pipe section (pipe section)
8 Neck part 11, 11 ′ Valve body part 16, 16 ′ Connection pipe (pipe line constituent part)
21 Work Case 42 Long Screw Bolt (Equipment)
43 Support device (working jig)
44 Leg (held part)
45 Support (load support)
45a recess (positioning means)
70 Buttocks (Equipment)
71 Rib (Equipment)
75 Auxiliary load receiver (load receiver)
76 Elastic member (load receiving part)
77 Tensioner (Load receiving part)
78 Eyebolt (Load receiving part)
431, 431 'support device (working jig)
432, 432 'support device (working jig)
433, 433 'support device (working jig)
434, 434 'support device (working jig)

Claims (6)

  A working jig for attaching a working case to a neck portion of the valve device, which is used for work in an uninterrupted flow state of a valve device forming a part of the pipe constituting portion, and an outer periphery of the pipe constituting portion And a held portion that is held in contact with each other so as not to be misaligned and sandwiched between the neck portions of the valve device, and supports the load of the working case that is disposed on the held portions that sandwich the neck portions. A working jig comprising: a load supporting portion for performing the above operation.   The working jig according to claim 1, wherein the held portion is locked and held by an installation portion formed in the pipe line constituting portion.   The working jig according to claim 1 or 2, further comprising positioning means for positioning the working case by concave-convex fitting.   The working jig according to claim 3, wherein the load support portion includes the positioning means.   The working jig according to any one of claims 1 to 4, wherein the held portion holds the neck portion across the pipe axis direction of the pipe line constituting portion.   With the valve device as a reference, it has a load receiving portion that receives an unbalanced load of the working case at a position separated from the load support portion in the pipe axis direction of the pipe line constituent portion. The working jig according to any one of claims 1 to 5.

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