JP2013245758A - Method of removing pipe connection member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of removing a pipe connection member with which, in a state that the pipe connection member having a proximate portion is mounted to a branch of a fluid pipe, a space for disposing a valve device can be secured around a flange for the branch of the fluid pipe and the pipe connection member.SOLUTION: A method of removing a pipe connection member includes: a cutting step of cutting a proximate portion 7b of a pipe connection member 3 being proximate to connecting parts 4, 5 of a branch 2 and the pipe connection member 3 by a cutting member 6 inserted into the pipe connection member 3 via a required mount space S; a closing step of closing a cut portion 7a which is left after cutting the proximate portion 7b in a sealed state by a closing member 16 mounted to the pipe connection member 3; and a removing step of removing the pipe connection member 3 from the branch part 2 by mounting a valve device 27 having a valve element 30 to the connecting parts 4, 5 after closing the cut portion 7a in the sealed state, inserting the valve element 30 into a clearance between the connecting parts 4, 5 and closing the branch 2.

Description

  The present invention relates to a method for removing a pipe connecting member that is connected to a branch portion of a fluid pipe and has a required space therein and is removed in an uninterrupted state.

  Conventionally, in the method of exchanging equipment (pipe connection members) such as air valves connected to water pipe systems, etc., the flanges where water pipes (existing pipes) branch pipes (branch parts) and air valves are connected Attach a channel blockage device (valve device), make the branch pipe section water-stopped by this channel blockage device, remove the equipment from the branch pipe section in a continuous water state without interrupting the flow of the fluid in the water pipe, The device is replaced with a new device (see, for example, Patent Document 1).

    In addition, a double-mouth air valve (pipe connecting member) that accommodates a float in each of the two left and right float chambers provided with air holes and opens and closes each air hole as each float moves up and down in the float chamber. In such a double-mouthed air valve, the lower part (flange proximity part) of the float chamber is close to the flange that connects the branch part of the existing pipe and the double-mouthed air valve (for example, Patent Documents). 2).

Japanese Unexamined Patent Publication No. 2007-32769 (page 10, FIG. 3) JP-A-8-170747 (page 3, Fig. 1)

  However, in the state where the double-ended air valve (pipe connecting member) described in Patent Document 2 is connected to the branched pipe portion (branched portion) of the water pipe (existing pipe), the double-ended air valve from the branched pipe portion of the water pipe The lower part of the float chamber of the double-mouth air valve (flange proximity part) is extended to the vicinity of the flange where the branch pipe part of the water pipe and the double-mouth air valve are connected. When the fluid piping system replacement method described in Document 1 is used, the lower part of the float chamber becomes obstructive, and the channel blocker (valve device) is connected to the branch pipe part of the water pipe and the double-ended air valve. There is a problem that the flange cannot be attached to the flange.

  The present invention has been made paying attention to such problems, and in a state where a pipe connecting member having a proximity portion is attached to a branching part of the fluid pipe, the flange between the branching part of the fluid pipe and the pipe connecting member is provided. It aims at providing the removal method of the pipe connection member which can ensure the arrangement space of a valve apparatus in the circumference | surroundings.

In order to solve the above-mentioned problem, a method for removing the pipe connecting member of the present invention includes:
A method of removing a pipe connecting member connected to a branch portion of a fluid pipe and removing a pipe connecting member having a required space therein in an uninterrupted state,
An excision step of excising the proximate part of the pipe connection member that is close to the connection part between the branch part and the pipe connection member with an excision member that is attached to the pipe connection member and inserted through the required space;
A closing step of sealingly closing the cut portion remaining after the proximity portion is cut off by a closing member attached to the pipe connecting member;
A valve device having a valve body is attached in a sealed manner to the connection portion after the cutting portion is closed, and the branch portion is closed by inserting the valve body into a gap between the connection portions. And a removing step of removing the pipe connecting member.
According to this feature, by using the required space inside the pipe connecting member, the cutting member is inserted toward the proximity portion, so that the cutting member can be easily approached to the proximity portion without being interfered by the connection portion. In addition, the cut portion can be excised without being distorted, and the sealing performance by the closing member can be improved. Furthermore, during the work of removing the pipe connection member, the work of removing the pipe connection member can be performed without causing the fluid to flow out from the cut portion sealed by the closing member.

The method for removing the pipe connecting member of the present invention is as follows.
The closing step is a step of bringing the closing member into contact with the inner periphery of the cutting portion and arranging the closing member in the required space.
According to this feature, by disposing the closing member in the required space that is the inner periphery of the cutting portion of the pipe connecting member, it is possible to prevent the closing member from protruding toward the connecting portion outside the pipe connecting member. Therefore, it is possible to reliably prevent the blocking member from interfering with the arrangement space of the valve device.

The method for removing the pipe connecting member of the present invention is as follows.
The closing step is a step of sealingly closing the cut portion through the required space by the closing member attached to the pipe connecting member instead of the cutting member obtained by cutting the proximity portion. It is said.
According to this feature, since the closing member is disposed using the position where the excision member is attached, it is not necessary to provide a space for disposing the closing member in the pipe connecting member. Further, since the closing member can be disposed at the same location as the cutting member, it is easy to approach the cutting portion.

The method for removing the pipe connecting member of the present invention is as follows.
The pipe connecting member is constituted by an air valve, and the cutting step is a step of cutting an end portion of the float chamber in the air valve.
According to this feature, the float chamber in the air valve has a simple structure that only accommodates the float, and the excision work can be easily performed using the required space that expands inside the float chamber.

It is front sectional drawing which shows the branch part of the fluid pipe | tube to which the double mouth air valve was connected. It is front sectional drawing which shows the cutting process which cuts off the proximity | contact part of a double-mouthed air valve with a cutting member. After performing the closing process in which the excised cutting part is closed with a closing member in a sealing manner, the valve device is attached to the flange of the double-ended air valve and the branch part, and the shut-off device is attached instead of the gate valve body. It is front sectional drawing shown. It is front sectional drawing which shows the state which is performing the removal process which removes a double-mouthed air valve from a branch part in the state which shielded the branch part with the interruption | blocking apparatus. It is front sectional drawing which shows the state which attached the repair valve and the storage case. It is a front view which shows the state which attached the single mouth air valve.

  EMBODIMENT OF THE INVENTION The form for implementing the removal method of the pipe connection member which concerns on this invention is demonstrated below based on an Example.

  A method for removing the pipe connecting member according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and the inner peripheral surface is powder-coated. Alternatively, it is covered with a mortar layer or the like. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of vinyl chloride, polyethylene, polyolefin, concrete, or asbestos. Furthermore, in the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas It may be a gas-liquid mixture of liquid and liquid.

  A branch portion 2 protruding upward is provided at a predetermined location of the fluid pipe 1. The branch portion 2 is connected to a double-ended air valve 3 as a pipe connecting member in the present embodiment for discharging air in the fluid pipe 1 or introducing air into the fluid pipe 1. A flange 5 that is a connecting portion of the present invention is formed at the upper end of the branch portion 2, and a flange 4 that is a connecting portion of the present invention is also formed at the lower end of the double-mouthed air valve 3. The flanges 4 and 5 are connected to each other by bolts and nuts.

  The double-mouthed air valve 3 needs to be replaced, for example, when it deteriorates over time or breaks down. In the present embodiment, the operation of removing the double-ended air valve 3 from the branch portion 2 in an uninterrupted flow state without interrupting the flow of the fluid in the fluid pipe 1 will be described even during the removal operation of the double-ended air valve 3. .

  The double-ended air valve 3 has two left and right float chambers 7 each having a hollow required space S, and floats 8 each having a substantially spherical shape are accommodated in the respective float chambers 7 so as to be movable up and down. The float chamber 7 has a substantially cylindrical shape, and its lower part has a hemispherical shape bulging downward. The lower portion of the float chamber 7 extends to a position close to both the flanges 4 and 5 of the branch portion 2 and the double-mouthed air valve 3. In addition, the lower part of this float chamber 7 comprises the proximity part 7b which adjoins both the flanges 4 and 5 in a present Example. Further, the float chamber 7 is connected via a communication hole 9 and a valve chamber 10 which are communicated with the branch portion 2 of the fluid pipe 1.

  In the valve chamber 10, a gate valve body 11 is provided for partitioning the valve chamber 10 and the communication hole 9 so as to be openable and closable. The gate valve body 11 protrudes from the upper part of the double-ended air valve 3. 12 is connected. The gate valve 11 can be opened and closed by the operator turning the valve shaft 12. When the gate valve body 11 is opened, the fluid in the fluid pipe 1 flows into the float chamber 7.

  A valve seat 13 is screwed into the upper opening of each float chamber 7, and a nozzle device 15 having a small-diameter air hole 15 a is provided in the valve seat 13. When the fluid position in the float chamber 7 is changed by the fluid flowing into the float chamber 7, the float 8 moves up and down in conjunction with the change. More specifically, the float 8 in the float chamber 7 abuts and separates from the nozzle device 15 to open and close the small-diameter air hole 15a, so that intake and exhaust of the fluid pipe 1 can be performed.

  As shown in FIG. 2, the valve seat 13 at the upper part of each of the left and right float chambers 7 of the double-mouthed air valve 3 in a state where the valve chamber 10 and the communication hole 9 are sealed in a sealed manner by the gate valve body 11. And the float 8 in the float chamber 7 is removed. Then, an excision member 6 for excising the proximity portion 7 b is attached to the upper portion of the float chamber 7. This cutting member 6 is composed of a shaft portion 6a that moves forward and backward in the required space S from the upper portion of the float chamber 7 toward the proximity portion 7b, and a cutter portion 6b that is attached to the tip of the shaft portion 6a. An excision step of excising the proximity portion 7b with the excision member 6 is performed.

  More specifically, an attachment portion 60 that pivotally supports the shaft portion 6 a to the double-mouthed air valve 3 is attached to the upper portion of the float chamber 7, and supports 61 and 61 are extended above the attachment portion 60. Yes. Further, a beam member 62 installed on the columns 61, 61 is provided at the upper ends of the columns 61, 61. The beam member 62 has a substantially central portion in the same direction as the shaft portion 6a. A rotating shaft 63 that extends in the direction of the shaft and is rotatable around the shaft is attached so as not to move forward and backward in the axial direction. Further, a male screw is screwed on the outer peripheral surface of the rotating shaft 63, and the shaft portion 6a is screwed to the outer peripheral surface of the rotating shaft 63 so as to be movable back and forth. Therefore, by rotating the rotation shaft 63, the cutting member 6 moves forward toward the proximity portion 7b while rotating along the male screw on the outer peripheral surface of the rotation shaft 63, and the proximity portion 7b is cut off. To do. At this time, since the proximity member 7b is excised from the inside of the float chamber 7 via the required space S by the excision member 6, the cut surface of the cut portion 7a remaining after the proximity portion 7b is excised is the inner side of the float chamber 7. It is formed on the inner peripheral surface facing.

  Next, as shown in FIG. 3, the cutting member 6 is removed, and the closing member 16 is attached to the upper part of the float chamber 7 in place of the cutting member 6, and the closing portion 16 is closed by the closing member 16.

  Specifically, the closing member 16 includes a closing plate portion 17 and a support rod portion 18, and a rubber sheet 19 is attached to the outer peripheral surface of the closing plate portion 17. The cut portion 7a remaining after the proximal portion 7b of the hemispherical float chamber 7 is cut out has a substantially circular shape when viewed from the bottom, and the closing plate portion 17 is viewed in plan according to the shape of the cut portion 7a. It is formed so as to form a substantially circular shape. In addition, a support lid member 20 is attached to the opening in the upper part of the float chamber 7 in a sealing manner, and the closing member 16 is supported by screwing the support rod portion 18 to the support lid member 20.

  A screw hole 23 into which the above-described support rod portion 18 of the closing member 16 can be screwed is formed at a substantially central portion of the support lid member 20, and the support rod portion 18 is screwed into this screw hole 23. The closing member 16 is supported by the support lid member 20, and in this state, the nut 25 is screwed and fixed to the upper end portion of the support rod portion 18. When the support rod portion 18 is screwed into the screw hole 23 of the support lid member 20, the support rod portion 18 can be adjusted by moving up and down through the required space S, and the closing plate portion 17 of the closing member 16 is cut. Abutting over the inner periphery of the portion 7a, the cut portion 7a is closed in a sealing manner by the rubber sheet 19 of the closing plate portion 17. That is, the closing member 16 does not protrude from the double-mouthed air valve 3 toward the flanges 4 and 5 but is accommodated inside the double-ended air valve 3. In the present embodiment, the rubber sheet 19 of the closing plate portion 17 is pressed against the cut surface of the cutting portion 7a, so that the cutting portion 7a is closed in a sealing manner. However, the present invention is not limited to this, and for example, the closing member may be tightly closed on the inner peripheral surface of the required space different from the cutting surface of the pipe connecting member, or the cutting portion may be sealed in a sealed manner, The cut portion may be sealed in a sealed manner by being in close contact with only the end edge portion instead of the entire cut surface, or by being in close contact with the end edge portion and the end surface of the pipe connecting member different from the cut surface.

  Next, the valve device 27 is attached around the flanges 4 and 5 of the branch portion 2 and the double-mouthed air valve 3. The valve device 27 houses a plate-like valve body 30 in a valve housing member 29 having a structure that can keep the inside sealed. The valve body 30 is attached to the upper end edge of the flange 5 of the branch portion 2. The branch part 2 is blocked by abutting.

  In detail, the bolts and nuts of both flanges 4 and 5 are loosened little by little and a gap forming means such as a spacer (not shown) is inserted into the gap between both flanges 4 and 5 to thereby provide flange 4 of double-ended air valve 3. Is moved upward, the opposing surfaces of the flanges 4 and 5 are separated from each other to form a gap, and then the valve body 30 of the valve device 27 is inserted into the gap. Note that the flange of the double-ended air valve may be moved upward by using the fluid pressure in the fluid pipe 1 by loosening the bolts and nuts without using the gap forming means.

  Then, the bolts and nuts are tightened again, and the valve body 30 is sandwiched between the opposing surfaces of the flanges 4 and 5. By doing in this way, the valve body 30 inserted in the gap | interval of both the flanges 4 and 5 is pressed against the upper end of the flange 5 of the branch part 2 from upper direction, and the branch part 2 is interrupted | blocked in a sealing form. In this state, since the fluid in the fluid pipe 1 does not flow into the double-ended air valve 3 side, the gate valve 11 of the double-ended air valve 3 is opened, and the double-ended air valve 3 and the gate valve 11 and The valve shaft 12 is removed.

  Next, as shown in FIG. 3, the shutoff device 35 is attached to the part of the double-mouthed air valve 3 where the gate valve body 11 and the valve shaft 12 are attached. In the state where the shut-off device 35 is connected to the double-ended air valve 3, the inside of the shut-off device 35 has a structure that can maintain hermeticity.

  The blocking device 35 includes a housing case 36 attached to the flange 5 of the branching section 2 in a sealing manner, a branching section blocking member 37 that is housed in the housing case 36 and blocks the branching section 2, and a branching section blocking member 37. And an insertion member 38 that is integrally connected to the upper end portion of the storage case 36 and protrudes from the upper surface of the storage case 36 so as to be movable up and down in a sealed manner with respect to the storage case 36.

  The insertion member 38 is mainly composed of an outer cylinder part 39 formed in an inner cylindrical shape and an inner collar part 40 that is rotatably inserted in the outer cylinder part 39, and a lower end of the inner collar part 40. A branch portion blocking member 37 is integrally connected to the portion, and a feed screw 42 is provided at the upper end portion of the inner collar portion 40 so that a seal member 41 described later can be expanded and contracted in the radial direction.

  Next, as a preparation for removing the double-ended air valve 3, a disc-shaped stand 43 having a divided structure larger in diameter than both flanges 4, 5 is attached below the flange 5 of the branch portion 2. Is a long rod-like, and the lower end portion of the column screw 44 in which the male screw portion is formed along the outer peripheral surface is screwed. Then, a moving arm 45 having an insertion hole that extends in the direction orthogonal to the blocking device 35 from the upper end portion of the blocking device 35 and that can be inserted through the column screw 44 is inserted into each column screw 44.

  Next, the valve body 30 of the valve device 27 is pulled in, and the valve body 30 is moved into the valve housing member 29 to open the branch portion 2. Even when the branching portion 2 is opened, the cutting portion 7a of the float chamber 7 of the double-ended air valve 3 is closed by the closing member 16, so that the inside of the shut-off device 35 and the double-ended air valve 3 maintains hermeticity. be able to.

  Then, as shown in FIG. 4, the moving arm 45 is pushed downward, and the upper end of the outer cylinder portion 39 is pressed downward via the moving arm 45, whereby the branch portion blocking member 37 is moved to the branch portion 2. It is arranged on the inner surface side.

  Next, the feed screw 42 is rotated by a ratchet or the like (not shown), and the seal member 41 of the branch portion blocking member 37 connected to the lower end portion of the inner collar portion 40 is extended in the radial direction so as to surround the inner peripheral surface of the branch portion 2. It adheres over the direction. In this manner, the seal member 41 is pressed and deformed and expanded in the radial direction, and the inside of the branch portion 2 is shielded and brought into a cut-off state.

  Next, the valve device 27 is removed from the flange 5 of the branch portion 2 while maintaining the shut-off state of the seal member 41. Next, the housing case 36 and the double-mouthed air valve 3 are slightly lifted upward, and a holding member 46 that locks the branching portion blocking member 37 is installed on the branching portion blocking member 37 and the column screws 44 and 44. While the branch portion blocking member 37 is supported by 46, the moving arm 45 is removed, and the housing case 36 and the double-mouthed air valve 3 are further lifted and removed from the branch portion 2.

  After that, as shown in FIG. 5, the presser member 46 is removed, the repair valve 48 and the housing case 36 are inserted and suspended from the outer cylinder portion 39 of the insertion member 38, and the moving arm 45 is attached again. The branch arm blocking member 37 is supported so as not to come out by fitting the moving arm 45 to the column screws 44 and 44 and fixing them.

  In a state in which the branch portion blocking member 37 is supported by the moving arm 45 so as not to come out, the repair valve 48 is connected to the flange 5 of the branch portion 2 in a sealing manner with bolts and nuts, and the storage case 36 is disposed above the repair valve 48. Install. When the repair valve 48 and the housing case 36 are attached to the flange 5, the feed screw 42 is operated to reduce the seal member 41, and the branch portion blocking member 37 is pulled up to the inside of the housing case 36.

  Next, after the repair valve 48 is closed and the storage case 36 is removed, as shown in FIG. 6, a new single-port air valve 3a (pipe connecting member) is attached to the upper side of the repair valve 48, and the repair valve 48 is attached. By setting the open state, the installation of the repair valve 48 and the single-port air valve 3a is completed. If the repair valve 48 is closed after the installation is completed, the single-port air valve 3a can be converted to a new one while the fluid pipe 1 remains in an uninterrupted state. In addition, you may make it install newly the double-mouth air valve instead of the single-mouth air valve 3a. Furthermore, the flange 5 after removing the existing pipe connecting member is not necessarily limited to the one to which the repair valve 48 is attached. For example, a new air valve may be directly attached to the flange 5.

As described above, according to the method for removing the pipe connecting member in the present embodiment, the proximity portion 7b of the double-ended air valve 3 adjacent to both flanges 4 and 5 of the branch portion 2 and the double-ended air valve 3 is The excision step of excision by the excision member 6 inserted into the air valve 3 via the required installation space S and the cutting part 7a remaining after the proximal portion 7b is excised are sealed by the closing member 16 attached to the double-mouth air valve 3. The valve device 27 having the valve body 30 is attached to the both flanges 4 and 5 after the cutting portion 7a is closed and the valve body 30 is sealed in the gap between the flanges 4 and 5. Is inserted, the branch part 2 is closed, and the double-ended air valve 3 is removed from the branch part 2. According to this, by using the required space S inside the double-ended air valve 3, the cutting member 6 is inserted toward the proximity portion 7b, so that the cutting member 6 is not interfered with by the flanges 4 and 5. Can be easily approached toward the proximity portion 7b, and the cutting portion 7a can be cut without being distorted, and the sealing performance by the closing member 16 can be improved. Furthermore, during the removal operation of the double-ended air valve 3, the removal operation of the double-ended air valve 3 can be performed without causing the fluid to flow out from the cutting portion 7a sealed by the closing member 16.

  Further, by disposing the closing member 16 in the required space S that is the inner periphery of the cutting portion 7 a of the double-ended air valve 3, the closing member 16 faces the both flanges 4, 5 outside the double-ended air valve 3. Since it can prevent overhang | projecting, it can prevent reliably that the obstruction | occlusion member 16 interferes with the arrangement | positioning space of the valve apparatus 27. FIG.

  Further, since the closing member 16 is disposed using the position where the cutting member 6 is attached, it is not necessary to provide a special space for the closing member 16 in the double-ended air valve 3. Moreover, since the closure member 16 can be arrange | positioned in the same location as the cutting member 6, it is easy to approach with respect to the cutting part 7a.

  In addition, the float chamber 7 in the double-ended air valve 3 has a simple structure that only accommodates the float 8, and the excision work can be easily performed using the required space S that expands inside the float chamber 7. Can do.

  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.

  In this embodiment, the excision member 6 is attached to the rotation shaft 63, and the excision member 6 is moved forward and backward while rotating by rotating the rotation shaft 63. A drive unit such as a motor for rotating and moving the shaft part forward and backward may be provided outside the attachment part by using a shaft part of a relatively long cutting member.

1 Fluid pipe 2 Branch 3 Double-mouth air valve (pipe connecting member)
3a Single port air valve (pipe connecting member)
4 Flange (connection part)
5 Flange (connection part)
6 Cutting member 7a Cutting part 7b Proximity part 16 Closing member 27 Valve device 30 Valve body

Claims (4)

A method of removing a pipe connecting member connected to a branch portion of a fluid pipe and removing a pipe connecting member having a required space therein in an uninterrupted state,
An excision step of excising the proximate part of the pipe connection member that is close to the connection part between the branch part and the pipe connection member with an excision member that is attached to the pipe connection member and inserted through the required space;
A closing step of sealingly closing the cut portion remaining after the proximity portion is cut off by a closing member attached to the pipe connecting member;
A valve device having a valve body is attached in a sealed manner to the connection portion after the cutting portion is closed, and the branch portion is closed by inserting the valve body into a gap between the connection portions. A detaching step of detaching the pipe connecting member from the pipe, and a method for removing the pipe connecting member.   2. The pipe connecting member according to claim 1, wherein the closing step is a step of bringing the closing member into contact with an inner periphery of the cutting portion and disposing the closing member in the required space. Removal method.   The closing step is a step of sealingly closing the cut portion through the required space by the closing member attached to the pipe connecting member instead of the cutting member obtained by cutting the proximity portion. The method for removing a pipe connecting member according to claim 1 or 2.   The pipe according to any one of claims 1 to 3, wherein the pipe connecting member is constituted by an air valve, and the cutting step is a step of cutting an end of a float chamber in the air valve. How to remove the connecting member.

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