JP2008051231A - Method for mounting and dismounting pipe connecting member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for mounting and dismounting pipe connecting members, by which method the pipe connecting members, such as pipe fittings, valves, air valves, can be easily mounted and dismounted as usual without requiring skillfulness. <P>SOLUTION: The method for mounting and dismounting pipe connecting members comprises a step for changing the bolts and nuts for connecting flanges F1, F2 of a branch B and the pipe connecting members to the bolts/nuts 9 for working, a step for watertightly mounting a valve device 1 having a valve body 2a onto the flanges F1, F2 of the branch B, a step for forming a gap between the flanges F1, F2 by loosening the bolts/nuts 9 for working and for inserting the valve body 2a into the gap, a step for stopping the flow from the existing pipe of the branch B toward the pipe connecting member side by pressing the valve body 2a against the seats of the flanges F1, F2 of the branch B, and a step for dismounting the pipe connecting member from the branch B in the water stop state of the branch B. As a result, the work for newly connecting the pipe connecting member to the branch B can be prepared. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention replaces pipe connection members such as pipe joints, valves, air valves and the like attached to branch portions of existing pipes with other pipe connection members in an uninterrupted state with respect to the existing pipes or repairs the same pipe connection members The present invention relates to a method for detaching a pipe connecting member for reattachment.

  Conventionally, when connecting / disconnecting pipe connection members such as air valves and repair valves, for example, to a branch portion of an existing pipe through a flange, etc., with respect to the existing pipe for replacement or maintenance / inspection, etc. When removing the pipe from the existing pipe, a large amount of fluid in the pipe flows out due to water pressure or the like, so the flow of the existing pipe to which the pipe connecting member is connected is blocked from the original, and the bolt that connects the flanges is removed. The tube connecting member was removed by inserting and removing. In addition, when replacing the pipe connection member connected to the branch part in an uninterrupted state, the branch part including the pipe connection member is covered from the outside by a sealed case, and the operation of the branch part flange from the outside of the sealed case is performed. In order to press the pipe connecting member and to replace the pipe connecting member, a work valve that partitions the inside of the sealed case has been used (see Patent Document 1).

Japanese Patent No. 3533276 (pages 2, 3 and 3)

However, the one described in Patent Document 1 requires that a relatively large sealed case be erected with respect to the branch portion and the pipe connecting member so as not to leak, and that the connection of the flange of the branch portion is released. More work is required, and there is a problem that the entire apparatus is enlarged because the work valve for the sealed case is provided.
The present invention has been made to solve the above-described problems, and can be easily constructed without increasing the size of the apparatus for detachment, and the detachment of the pipe connecting member is performed without a constant flow without requiring skill. An object of the present invention is to provide a method for attaching and detaching a pipe connecting member.

In order to solve the above-described problem, a method for attaching and detaching a pipe connecting member according to claim 1 of the present invention includes:
A method of detaching a pipe connecting member attached to a branch portion of an existing pipe, the step of replacing bolts and nuts connecting the flanges of the branch portion and the pipe connecting member with working bolts and nuts; Attaching a valve device having a body to the flange of the branch portion in a watertight manner, loosening the working bolts and nuts to provide a gap between the flanges, inserting the valve body into the gap, and Pressing the flange seat of the branching section to stop the flow from the existing pipe of the branching section to the pipe connecting member side, and removing the pipe connecting member from the branching section with the branching section stopped It is characterized by preparing for the operation | work which newly connects a pipe connection member to the said branch part.
According to this feature, the valve body of the valve device attached to the flange of the bifurcation is pressed against the flange seat to stop the flow to the pipe connection member side, and in an uninterrupted state with respect to the existing pipe Since the pipe connecting member can be detached, it can be detached in an uninterrupted state by an extremely simple operation by a device that is simply attached to the flange portion and does not increase in size.

The pipe connecting member detaching method according to claim 2 of the present invention is the pipe connecting member detaching method according to claim 1, wherein the valve device is provided with a valve body pressing mechanism, and the valve body pressing mechanism is By operating, the valve body is pressed against the flange seat of the branch portion.
According to this feature, the valve body can be reliably pressed against the flange seat only by operating the valve body pressing mechanism.

The pipe connecting member detaching method according to claim 3 of the present invention is the pipe connecting member detaching method according to claim 1 or 2, wherein the valve device is provided with a packing pressing mechanism, and the packing pressing mechanism is By operating it, the packing is brought into close contact with the peripheral surface of the flange, and is attached in a watertight manner.
According to this feature, since the packing is brought into close contact with the flange, water can be reliably stopped.

The pipe connecting member detaching method according to claim 4 of the present invention is the pipe connecting member detaching method according to claim 3, wherein the packing pressing mechanism is operated toward the flange of the branch portion. And a pressing portion that operates toward the flange of the pipe connecting member.
According to this feature, since the packing is pressed separately on the flanges of the branch part and the pipe connection member, the water stop of the flange of the pipe connection member can be released while the flange of the branch part is stopped. The work of detaching the pipe connecting member can be performed efficiently.

The pipe connecting member attaching / detaching method according to claim 5 of the present invention is the pipe connecting member attaching / detaching method according to any one of claims 1 to 4, wherein the working bolt and nut are bolts of the flange. It is characterized by being watertightly attached to the insertion hole.
According to this feature, since water does not leak from the bolt insertion hole, the detaching operation can be easily performed.

The pipe connecting member detaching method according to claim 6 of the present invention is the pipe connecting member detaching method according to any one of claims 1 to 5, wherein the valve body is at least on the surface on the branching portion side. A seal member is provided.
According to this feature, the sealing member abuts against the flange seat of the branch portion, so that water can be reliably stopped.

The pipe connecting member detaching method according to claim 7 of the present invention is the pipe connecting member detaching method according to any one of claims 1 to 6, wherein the valve device is connected to the branch portion. It is characterized in that a flange separation mechanism for moving the flange in the direction of separating the flange is provided.
According to this feature, since the gap between the flanges can be surely provided by the flange separation mechanism, the valve body can be easily inserted between the flanges, and the work can be performed efficiently.

  Examples of the present invention will be described below.

  Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1-24 shows one Embodiment of this invention, FIG. 1 is explanatory drawing which shows the state by which the air valve and flange short pipe of the pipe connection member based on this invention are attached to the branch part, FIG. 2 is the first step in the method of attaching and detaching the pipe connecting member attached to the branch portion according to the present invention, and is an explanatory view showing a state where the working bolts and nuts are replaced. FIG. 3 is a step of installing the valve device on the flange. FIG. 4 is an explanatory view of a process of providing a gap between flanges by a flange separation part, FIG. 5 is an explanatory view of a process of pressing a valve body inserted between the flanges against a seat of the flange by a valve body pressing part, 6 is an explanatory diagram of a process of releasing the pressing of the packing on the flange of the short flange pipe, FIG. 7 is an explanatory diagram of a process of removing the air valve and the short flange pipe, and FIG. 8 is an explanatory diagram of a process of newly installing a repair valve. Fig. 9 shows the packing of the flange of the repair valve FIG. 10 is an explanatory diagram of the process of pulling out the valve of the valve device from between the flanges, FIG. 11 is an explanatory diagram of the process of attaching the repair valve to the branch portion with the working bolts and nuts, FIG. FIG. 13 is an explanatory diagram of a process of removing the valve device from the flange portion and replacing the working bolts and nuts with bolts and nuts, FIG. 13 is an explanatory diagram of the valve device of the present embodiment, and FIG. 14 is a cross-sectional view of the valve device of the present embodiment. 15 is a partial cross-sectional view of the valve device in the embodiment, and FIG. 16 is a mounting cross-sectional view of working bolts and nuts.

  FIG. 17 is an explanatory sectional view of a closing device in another embodiment, FIG. 18 is an explanatory view of a step of attaching the closing device, FIG. 19 is an explanatory view of a step of installing a closing member at the branching portion, and FIG. FIG. 21 is an explanatory diagram of a process for attaching a repair valve and a storage case to the branch portion, FIG. 22 is an explanatory diagram of a process for recovering the closing member, and FIG. 23 is for removing the closing device and attaching an air valve. It is explanatory drawing of a process.

  FIG. 24 is an explanatory partial sectional view of still another embodiment.

  As shown in FIG. 1, in order to discharge the air in the tap water flowing through the pipe of the fluid pipe P (existing pipe) to the outside of the pipe, or to prevent the inside of the pipe from becoming negative pressure, every predetermined portion of the fluid pipe P Is provided with an air valve AV1 (pipe connecting member), and the air valve AV1 is attached via a flange F1 and a short flange pipe FP (pipe connecting member) at the upper end of the branch B provided in the fluid pipe P. It has been.

  Normally, a repair valve V (pipe connecting member) that opens and closes the flow from the branch portion B during repair and adjustment of the air valve AV1 is attached to a flange F1 provided in the branch portion B of the fluid pipe P. In many cases, an air valve AV2 is attached to the upper end of V via a flange (see FIG. 12).

  As shown in FIG. 1, it is necessary to replace the air valve AV1 that is not provided with the repair valve V, or the air valve AV1 that is provided with the repair valve V and has the water stop failure due to failure or the like. In this case, the method for detaching the pipe connecting member of this construction method is adopted.

  First, the valve apparatus 1 used by this construction method is demonstrated.

  As shown in FIG. 13, the valve device 1 is divided into a valve housing member 2 and a mounting member 3. The valve device 1 is sandwiched between the flange F <b> 1 and the flange F <b> 2 from the circumferential direction and connected by mounting bolts and nuts 4. .

  The valve housing member 2 is provided so that the plate-like valve body 2a, the entire surface of which is covered by an elastic seal member 2b, can be moved forward and backward by rotating the valve shaft 2c so that the water stops at the flange seat S of the branch portion B. A rectangular portion 2e, an arc-shaped portion 2f having an inner diameter slightly larger than the outer diameter of the flange F1, and a hook hole projecting outward from the arc-shaped portion 2f and passing through the mounting bolt / nut 4 The portion 2g and the flange separation portion 5 (flange separation mechanism). At the lower part of the arc-shaped part 2f, a flange part 2h protruding in the flange direction provided with an abutting part 2i screwed into and away from the lower surface of the flange F1 so as not to affect the operation of the bolt / nut BN. Is formed. Further, on the inner peripheral surface of the arcuate portion 2f, there are provided a flange F1 and an elastic water-stop sheet 2d that contacts the outer peripheral surface of the flange F2 and stops the water. The length is set so that the parts abut each other. (See Figure 14)

  As shown in FIG. 15 (a), the flange spacing portion 5 includes a wedge body 5a having a tapered surface with a lower surface in a cross-sectional view substantially parallel to the flange and a tapered upper surface, and a screw member for moving the wedge body 5a forward and backward. 5b, and an interior portion 5e that accommodates the wedge body 5a and the screw member 5b. Even if the screw member 5b rotates, the wedge body 5a does not rotate at the rear of the wedge body 5a and the front of the screw member 5b. It is engaged so that it can be moved forward and backward in the state, and is attached in a watertight manner.

  A rectangular hole 5c for disposing the wedge body 5a is provided at a proper position of the arc-shaped portion 2f on the flange side to prevent the rotation of the wedge body 5a, and a screw member 5b is screwed to the outside thereof. An interior portion 5e in which a screw hole 5d is screwed is provided.

  By rotating the screw member 5b, the wedge body 5a moves back and forth linearly without rotating in the rectangular hole 5c.

  The mounting member 3 includes an arcuate portion 3a having an inner diameter slightly larger than the outer diameter of the flange F1 and substantially the same as the arcuate portion 2f of the valve housing member 2, and an arcuate portion 3a including the lower pressing bodies 7a and 7b. A latching portion 3b provided with a bolt hole through which the mounting bolt / nut 4 is inserted, a flange spacing portion 5 similar to that of the valve housing member 2, and a valve body for pressing the valve body 2a against the flange seat S It consists of a pressing part 6 and a waterproof sheet pressing part 7.

  A flange portion 3c projecting in the flange direction is provided with a contact portion 3d screwed to the lower surface of the flange F1 at the lower portion of the arc-shaped portion 3a so that the operation of the bolt and nut BN is not affected. Is formed. The flange spacing portion 5 has the same configuration as the flange spacing portion 5 of the valve housing member 2, and in this embodiment, the interior portion 5e is integrated with an interior portion 6e of the valve body pressing portion 6 described later. Two places are provided at appropriate positions of the arc-shaped portion 3a.

  As shown in FIG. 15 (b), the valve body pressing portion 6 (valve body pressing mechanism) includes a wedge body 6a having a tapered surface with a top surface substantially parallel to the flange and a bottom surface tapered, as shown in FIG. 6a includes a screw member 6b that moves forward and backward, and an interior portion 6e that accommodates the wedge body 6a and the screw member 6b. The screw member 6b rotates between the rear portion of the wedge body 6a and the front of the screw member 6b. Also, the wedge body 6a is engaged so that it can be moved back and forth without rotating.

  The interior portion 6e integrated with the interior portion 5e of the flange separation portion 5 is provided with a rectangular hole 6c in which a surface for preventing the rotation of the wedge body 6a is provided on the flange side and the wedge body 6a is disposed, A screw hole 6d into which the screw member 6b is screwed is provided on the outside.

  The water-stop sheet pressing portion 7 (packing pressing mechanism) is an arcuate lower pressing body 7b that presses the water-stop sheet 8 that is in close contact with the outer peripheral surface of the flanges F1 and F2 against the flange F1 of the branch portion, as shown in FIG. Interior provided with an upper pressing body 7a that presses against the flange F2 of the pipe connecting member, screw members 7c and 7c that move the upper and lower pressing bodies 7a and 7b back and forth, and a screw hole 7d into which the screw member 7c is screwed. The upper portion of the upper and lower pressing bodies 7a and 7b and the front of the screw member 7c are moved forward and backward without rotation even if the screw member 7c rotates. And is watertightly attached.

  On the inner peripheral surfaces of the upper and lower pressing bodies 7a and 7b, there are provided an elastic water-stop sheet 8 that contacts the outer peripheral surfaces of the flanges F1 and F2 to stop the water. 2d and the end portions are in contact with each other, and a hole through which the wedge bodies 5a and 6a of the flange separation portion 5 and the valve body pressing portion 6 enter and exit is provided.

  A packing 10 is provided at a contact portion between the valve housing member 2 and the mounting member 3 and joined in a watertight manner.

  Upper portions of the arc-shaped portions 2f and 3a are formed in substantially the same plane, and flange mounting portions 2j and 3e are provided for watertightly connecting the flanges of the closing device.

  Next, a method for detaching and attaching the air valve AV1 as a pipe connecting member will be described.

  First, as shown in FIG. 1, the flange F1 of the branch portion B and the flange F2 of the flange short pipe FP connected to the flange F1 by bolts and nuts BN are cleaned, and the state of the flange is confirmed. If there are irregularities etc. that will adversely affect water stoppage due to packing etc., repair it, then remove the bolts and nuts BN one by one from the flange and replace them with work bolts and nuts 9, and all as shown in Fig. 2 Replace with working bolts and nuts 9.

  As shown in FIG. 16, the working bolt / nut 9 is composed of a nut 9a, a bolt 9b, and a washer 9c. One end of the nut 9a is closed and the other end is opened, and the inner peripheral surface. The hexagonal column is formed with a female screw corresponding to the bolt 9b. Further, a flange portion is provided on the open end side, and a packing groove is formed on a surface that comes into contact with the flange to accommodate the packing.

  The bolt 9b is a hexagonal bolt corresponding to the female screw of the nut 9a, and is set to a length that allows the nut 9a and the threaded portion to sufficiently engage even when a predetermined gap is provided between the flange F1 and the flange F2.

  The washer 9c is composed of a doughnut-shaped sealing member and a metal washer main body that covers the outer periphery and a flat surface of the sealing member.

  By exchanging the bolts and nuts 9 for work, water leakage from the bolt insertion holes of the flanges is prevented by the packing of the nuts 9a and the seal members of the washers 9c.

  The working bolt / nut 9 is not limited to the present embodiment, and the nut 9a may be water-stopped by using a normal nut and a washer 9c, and a packing groove may be provided in the bolt head. The bolts and nuts may have any structure that prevents water leakage from the bolt insertion holes of the flange.

  Next, as shown in FIG. 3, the valve device 1 divided into two parts is attached to the flange F <b> 1 and the flange F <b> 2 in the circumferential direction from the valve housing member 2 and the attachment member 3.

  In order to attach the valve device 1 to the flange, first, the screw member 5b of the flange separation portion 5 is rotated to set the wedge body 5a at a position where the tip of the wedge body 5a slightly protrudes from the water-stop sheets 2d, 8; With the bottom surface of 5a in contact with the top surface of the flange F1 of the branching section B, the valve housing member 2 and the mounting member 3 are faced to sandwich the flange F1 and flange F2 from the circumferential direction, and the opposing valve housing member 2 and mounting member 3 The valve device 1 is installed through the packing 10 by inserting mounting bolts and nuts 4 into the bolt insertion holes of the latching portions 2g and 3b and tightening them with the nuts. The screw member 7c of the water-stop sheet pressing portion 7 is rotated, and the lower press members 7a and 7b are moved in the flange direction to press-bond the water-stop sheets 2d and 8 to the outer peripheral surfaces of the flanges F1 and F2. Next, the abutting portions 2i and 3d are rotated and their tips are brought into contact with the lower surface of the flange F1.

  When the valve device 1 is installed after applying grease to the outer peripheral surface of the flange F2 with which the water-stop sheets 2d and 8 abut, the movement of the flange F2 described later becomes smooth.

  Since the lower surface of the wedge body 5a is positioned in contact with the upper surface of the flange F1, positioning of the valve housing member 2 and the mounting member 3 is facilitated, and the installation position in the vertical direction is reliably performed.

  When the valve device 1 is mounted in this way, the gap between the flange F1 and the flange F2 is formed by the water-stop sheets 2d and 8, and the bolt insertion holes of the flange F1 and the flange F2 are the packing and seal member of the working bolt / nut 9. Thus, since the valve housing member 2 and the mounting member 3 are stopped by the packing 10, they can be installed in a watertight manner.

  Next, as shown in FIG. 4, a gap is formed between the flange F1 and the flange F2 so that the valve body 2a of the valve device 1 can be inserted.

  When the working bolts and nuts 9 are loosened one by one and the screw member 5b of the flange separation portion 5 is rotated to advance the wedge body 5a in the flange direction, the flange F2 is moved from the flange F1 by the wedge action of the wedge body 5a. Move away. The flanges F1 and F2 are moved little by little so that they are as parallel as possible. The work bolt / nut 9 may be loosened and moved by the action of water pressure. Even while the flange F2 is moved, the gap between the flange F1 and the flange F2 is formed by the water-stop sheets 2d and 8, and the bolt insertion holes of the flange F1 and the flange F2 are the packing of the work bolt and nut 9, and the seal member The work is stopped by the working bolt and nut 9 from the flange F2. When the wedge body 5a is advanced, the tapered surface hits the lower part of the corner of the flange F2, and the contact portions 2i and 3d are in contact with the lower surface of the flange F1, so that a reaction force is obtained and the flange 2F moves upward.

  Since the gap between the flanges can be reliably opened by the flange separating portion 5, the valve body 2a can be inserted reliably and easily, and the operation can be performed efficiently.

  Next, as shown in FIG. 5, the valve shaft 2c of the valve device 1 is rotated in the gap between the flange F1 and the flange F2 to move the valve body 2a toward the center of the flange and insert it to a predetermined position where the branch portion B is closed. Then, the screw member 6b of the valve body pressing portion 6 is rolled to move the wedge body 6a forward, and the valve body 2a is pressed against the seat S of the flange F1 by the tapered surface of the wedge body 6a to stop the water. At this time, when the contact portions 2i and 3d are screwed, a force that moves the entire valve device 1 in the direction of the fluid pipe P acts as a reaction force, so that the valve body 2a can be further pressed against the seat S.

  Since the valve body 2a is covered with the seal member 2b, the seal member 2b is strongly pressed against the seat S of the flange F1, and the flow from the branch portion B is reliably stopped.

  Next, since the flow from the branch part B is stopped, as shown in FIG. 6, as a preparation for removing the air valve AV1 and the flange short pipe FP, the screw member 7c of the upper pressing body 7a of the water stop sheet pressing part 7 is used. Is reversely rotated to retreat the upper pressing body 7a to release the pressing of the water-stop sheets 2d and 8 against the flange F2, and the work bolts and nuts 9 are removed as shown in FIG. The flange short pipe FP and the air valve V1 are removed from F1.

  Since the pressing portion is divided into the upper pressing body 7a and the lower pressing body 7b, it is possible to release the pressing of the flange F2 of the flange short pipe FP while pressing the flange F1 of the branching section B with the water stop sheets 2d and 8. Since it is possible, it can be exchanged in a continuous flow.

  Further, since the valve body 2a is pressed against the seat S of the flange F1 of the branch portion B and water is stopped, there is no leakage even if the working bolt / nut 9 is removed, and the contact portions 2i and 3d are flanged. Since it is in contact with the lower surface of F1, movement of the valve device 1 due to water pressure can be prevented even if water pressure is applied to the valve body 2a.

  Next, as shown in FIG. 8, the repair valve V that is in a state in which the valve body is closed in a state in which the pressure of the upper pressing body 7 a of the water-stop sheet pressing portion 7 is released is set at a predetermined position of the valve device 1. The bolts and nuts 9 are attached to the flange F1, and the screw member 7c of the upper pressing body 7a of the water stop sheet pressing portion 7 is rotated to advance the upper pressing body 7a as shown in FIG. The water stop sheets 2d and 8 are pressed against the flange F3 to stop the water.

  When grease is applied to the outer peripheral surface of the flange F3 of the repair valve V with which the water-stop sheets 2d and 8 abut, the flange F3, which will be described later, moves smoothly when grease is installed on the valve device 1.

  Next, as shown in FIG. 10, the screw member 6b of the valve body pressing portion 6 is reversely rotated to retract the wedge body 6a to release the pressure on the seat S of the flange F1, and the flange F1 and the flange F3 From the gap, the valve shaft 2c of the valve device 1 is reversely rotated to move the valve body 2a into the rectangular portion 2e to release the blockage of the branch portion B.

  Next, as shown in FIG. 11, the screw member 5b of the flange separation portion 5 is reversely rotated to retract the wedge body 5a, and the work bolts and nuts 9 are uniformly tightened to attach the flange F3 to the flange F1.

  The mounting bolt / nut 4 that connected the valve housing member 2 and the mounting member 3 is removed, the valve device 1 is removed from the flange portion, and the working bolt / nut 9 that connected the flange F1 and the flange F3 is 1 The bolts and nuts BN for regular attachment are replaced one by one, a new air valve V2 is attached on the repair valve V, the valve body of the repair valve V is switched to the open position, and the installation is completed.

  As described above, according to this method, the valve body 2a of the valve device 1 that is watertightly attached to the flange F1 of the branch portion B is pressed against the seat S of the flange F1, thereby causing the flow toward the pipe connecting members FP and AV1. Since the pipe connection members FP and AV1 can be attached to and detached from the fluid pipe P in an uninterrupted flow state, it can be simply attached to the flange, using a device that does not increase in size, and extremely simple operation of rotating the bolt Can be desorbed in a continuous flow state.

  In the above embodiment, after the pipe connecting member (flange short pipe FP, air valve AV1) is removed using the valve device 1, a new pipe connecting member (repair valve V) is directly attached. Another embodiment using is shown.

  This embodiment is performed by performing the same steps as the steps from FIGS. 1 to 7 of the embodiment, and then attaching the closing device 11 instead of the repair valve V.

  As shown in FIG. 17, the closing device 11 includes a storage case 12 attached to the flange F <b> 1 of the branch portion B, and a closing member 13 that is stored inside the storage case 12 and closes the branch port BE of the branch portion B. It is configured.

  The housing case 12 has a flange 12a that can be water-tightly connected to the flange F1 of the branch portion B at one end, and a closing member 13 is housed inside.

  The closing member 13 passes through the center of the cylindrical elastic body 13a, and a spindle 14 that expands and contracts the engaging body 13d at the tip end in the radial direction by rotation of the handle 17 attached to the top end, and a handle 17 ′ at the top end. A screw 15 is screwed below, a sleeve 15 having a support 13b of an elastic body 13a below it, a screw 17 fitted to the screw of this sleeve 15, a handle 17 '' at its upper end, and an elastic body at its lower end. It is comprised with the pipe 16 provided with the press body 13c which can press 13a upper part.

  The handles 17, 17 ′, 17 ″ are detachably attached to the spindle 14, the sleeve 15, and the pipe 16, and the spindle 14, the sleeve 15, and the pipe 16 are attached to the housing case 12 in a watertight manner. ing.

  The closing device 11 is attached to the branch portion B in a state where the pipe connecting member (flange short pipe FP, air valve AV1) shown in FIG. 7 is removed. As shown in FIG. 18, the outer peripheral surface of the flange 12 a at the lower end of the housing case 12 of the closing device 11 is in contact with the water-stop sheets 2 d and 8 in a state in which the pressure of the upper pressing body 7 a of the water-stop sheet pressing portion 7 is released. It is set at a predetermined position, attached to the flange F1 using the working bolts and nuts 9, and the upper pressing body 7a is moved forward by rotating the screw member 7c of the upper pressing body 7a of the water stop sheet pressing portion 7 to move the housing case 12 The water-stop sheets 2d and 8 are pressed against the outer peripheral surface of the flange 12a at the lower end to stop the water.

  After installing the closing device 11 in a water-stopped state, the screw member 6b of the valve body pressing portion 6 is reversely rotated to retract the wedge body 6a to release the close contact with the seat S, and the gap between the flange F1 and the flange 12a. Then, the valve shaft 2c of the valve device 1 is reversely rotated, the valve body 2a is moved into the rectangular portion 2e, the branch portion B is opened, the working bolt / nut 9 is tightened, and the flange F1 and the flange 12a are joined. .

  Next, as shown in FIG. 19, the closing member 13 is fed to a predetermined position on the inner surface of the branching section B using the handle 17 ′ of the sleeve 15, the handle 17 of the spindle 14 is rotated, and the engaging body at the tip of the spindle 14 is rotated. 13d is extended in the radial direction and locked to the inner peripheral surface of the fluid pipe P of the branch port BE. In this state, the handle 17 'of the sleeve 15 is pressed and fixed, and the handle 17' 'of the pipe 16 is rotated to move the support 13b holding the elastic body 13a and the pressing body 13c relative to each other. The elastic body 13a is pressed and deformed to expand in the radial direction, and the inside of the branch port BE is shielded to be in a water stop state.

  Next, as shown in FIG. 20, the handles 17, 17 ′, 17 ″ are removed from the spindle 14, the sleeve 15 and the pipe 16, and a stopper (not shown) for fixing the pipe 16 is attached to the upper end of the sleeve 15. Fix and maintain the expanded state of the elastic body 13a. In this state, the valve device 1 is removed from the flanges F1 and 12a, the working bolts and nuts 9 are removed, and the housing case 12 is removed from the flange F1 of the branch portion B.

  Then, as shown in FIG. 21, the new repair valve V and the housing case 12 are inserted into the spindle 14, the sleeve 15 and the pipe 16, and the repair valve V is connected to the flange F1 of the branch portion B in a watertight manner with bolts and nuts BN. The storage case 12 is installed above the repair valve V.

  Since the repair valve V can be attached after inspecting, cleaning, and repairing the seat S of the flange F1 of the branch portion B, it is possible to reliably ensure water stopping performance.

  When the repair valve V and the storage case 12 are attached, the handles 17, 17 ', 17' 'are attached to the spindle 14, the sleeve 15 and the pipe 16, and the handle 17' of the pipe 16 is supported while the handle 17 'of the sleeve 15 is supported. 22 is operated to reduce the elastic body 13a, the spindle 14 is operated to reduce the engaging body 13d, and the engagement of the branch port BE with the inner peripheral surface of the fluid pipe P is released, as shown in FIG. The closing member 13 is pulled up to the inside of the housing case 12.

  Next, as shown in FIG. 23, after the repair valve V is closed and the housing case 12 is removed, an air valve AV2 is attached to the upper side of the repair valve V, and the repair valve V is opened, thereby providing a new repair valve. V can be installed below the air valve AV2. In this case, not only can the air valve AV2 be converted to a new one, but also the air valve AV1 can be inspected and maintained and reattached.

  According to the method for attaching and detaching the pipe connecting member of the above embodiment, by pressing the valve body 2a of the valve device 1 that is watertightly attached to the flange F1 of the branching portion B against the seat S of the flange F1, the pipe connecting member FP, Since the flow to the AV1 side can be stopped and the pipe connecting members FP and AV1 can be detached from the fluid pipe P in an uninterrupted flow state, a simple and non-sizing device that can be attached to the flange can be used. It can be attached and detached in an uninterrupted flow state by a very simple operation of rotation, and by using the closing device 11, the seat S of the flange F1 can be inspected, cleaned, repaired, etc., so that the water tightness of the pipe connecting member to be attached Can be kept high.

  While the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to this.

  For example, in the embodiment, the repair valve and the air valve are installed after removing not only the air valve but also the short flange tube, but the repair valve and the air valve may be installed while leaving the short flange tube.

  In the embodiment, the valve body pressing portion is composed of a wedge body and a screw portion. However, as shown in FIG. 24, a valve body engaging portion 3e is provided, and the valve body 2a is used as the valve body engaging portion 3e. After the locking, the contact portions 2i and 3d may be operated to move the entire valve device 1 to the fluid pipe P side and press the valve body 2a against the seat S of the flange F1 to stop the water.

  Moreover, in the Example, although the water stop sheet | seat press part was provided only in the attachment member, you may provide also in a valve accommodation member.

  Further, in the embodiment, the valve body of the valve device is moved by the rotation operation of the valve shaft, but it may be a simple structure that is pushed in by an external force.

  Moreover, although the flange separation | spacing part is advanced / retracted with the screw | thread, you may insert / extract with an external direct force.

  Alternatively, the valve device is divided into two parts, the valve housing member and the mounting member, but it may be divided into three parts, and the wedge body 3a may not be provided if the tip of the screw member is formed in a conical shape.

It is explanatory drawing which shows the state by which the air valve and flange short pipe of the pipe connection member concerning this invention are attached to the branch part. It is explanatory drawing which shows the state which was the first process in the removal | desorption method of the pipe connection member attached to the branch part which concerns on this invention, Comprising: It replaced with the working bolt and nut. It is explanatory drawing of the process of installing a valve apparatus in a flange. It is explanatory drawing of the process of providing a clearance gap between flanges by a flange spacing part. It is explanatory drawing of the process of pressing the valve body inserted between flanges on the seat of a flange by a valve body press part. It is explanatory drawing of the process which cancels | releases the press of the packing to the flange of a flange short pipe. It is explanatory drawing of the process of removing an air valve and a flange short pipe. It is explanatory drawing of the process of newly installing a repair valve. It is explanatory drawing of the process of pressing the flange of a repair valve with packing and stopping water. It is explanatory drawing of the process of extracting the valve of a valve apparatus from between flanges. It is explanatory drawing of the process of attaching a repair valve to a branch part with a volt | bolt and nut for work. It is explanatory drawing of the process of removing a valve apparatus from a flange and replacing | exchanging a working volt | bolt nut to a volt | bolt nut. It is explanatory drawing of the valve apparatus of a present Example, (a) is a top view, (b) is a side view, (c) is a bottom view. It is sectional drawing of the valve apparatus of a present Example, (a) is AA sectional drawing of FIG.13 (b), (d) is BB sectional drawing of Fig.13 (a). BRIEF DESCRIPTION OF THE DRAWINGS It is a fragmentary sectional view of the valve apparatus in a present Example, (a) is sectional drawing of a flange separation | spacing part, (b) is sectional drawing of a valve body press part, (c) is sectional drawing of a water stop sheet | seat pressing part. . It is an attachment sectional view of a work bolt and nut. It is explanatory sectional drawing of the obstruction | occlusion apparatus in another Example. It is explanatory drawing of the process of attaching a closure apparatus. It is explanatory drawing of the process of installing a blocking member in a branch part. It is explanatory drawing of the process of removing a valve apparatus and a storage case. It is explanatory drawing of the process of attaching a repair valve and a storage case to a branch part. It is explanatory drawing of the process of collect | recovering a closure member. It is explanatory drawing of the process of removing an obstruction | occlusion device and attaching an air valve. It is a description fragmentary sectional view of another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve apparatus 2 Valve accommodating member 2a Valve body 2b Seal member 2c Valve shaft 2d Water stop sheet 2e Rectangular part 2f Arc-shaped part 2g Hatch part 2h Hook part 2i Contact part 3 Attachment member 3a Arc-shaped part 3b Hatch part 3c 3d Contact part 3e Valve body engagement part 4 Mounting bolt / nut 5 Flange separation part (flange separation mechanism)
5a Wedge body 5b Screw member 5c Rectangular hole 5d Screw hole 5e Interior part 6 Valve body pressing part (valve body pressing mechanism)
6a Wedge body 6b Screw member 6c Rectangular hole 6d Screw hole 6e Interior part 7 Water-stop sheet pressing part (packing pressing mechanism)
7a Upper pressing body 7b Lower pressing body 7c Screw member 7d Screw hole 7e Interior part 8 Water stop sheet 9 Work bolt / nut 9a Nut 9b Bolt 9c Washer 10 Packing 11 Closing device 12 Housing case 12a Flange 13 Closing member 13a Elastic body 13b Support body 13c Press body 13d Engagement body 14 Spindle 15 Sleeve 16 Pipe 17 Handle 17 ', 17''Handle P Fluid pipe (existing pipe)
B Branch part BE Branch port BN Bolt / Nut F1, F2, F3 Flange S Seat AV1, AV2 Air valve (pipe connecting member)
FP Flange short pipe (pipe connecting member)
V Repair valve (pipe connecting member)

Claims (7)

A method for detaching a pipe connecting member attached to a branch portion of an existing pipe,
Replacing the bolts and nuts connecting the flanges of the branch part and the pipe connecting member with working bolts and nuts, attaching the valve device having a valve body to the flange of the branch part in a watertight manner, and A step of loosening the working bolts and nuts to provide a gap between the flanges and inserting the valve body into the gap; and pressing the valve body against the flange seat of the branch part to A step of stopping the flow to the connecting member side, and a step of removing the pipe connecting member from the branching part in a state where the branching part is stopped, and for connecting a new pipe connecting member to the branching part. A method for attaching and detaching a pipe connecting member.   The method for attaching and detaching a pipe connecting member according to claim 1, wherein the valve device is provided with a valve body pressing mechanism, and the valve body is pressed against a flange seat of the branching portion by operating the valve body pressing mechanism.   The method of attaching or detaching a pipe connecting member according to claim 1 or 2, wherein a packing pressing mechanism is provided in the valve device, and the packing pressing mechanism is operated so that the packing is brought into close contact with the peripheral surface of the flange and is attached in a watertight manner.   The detachment of the pipe connecting member according to claim 3, wherein the packing pressing mechanism is divided into a pressing part that operates toward the flange of the branching part and a pressing part that operates toward the flange of the pipe connecting member. Method.   The method of attaching or detaching a pipe connecting member according to any one of claims 1 to 4, wherein the working bolt and nut are watertightly attached to a bolt insertion hole of the flange.   6. The method of attaching and detaching a pipe connecting member according to claim 1, wherein the valve body is provided with a seal member on at least a surface on the branching portion side.   The pipe connection member attaching / detaching method according to any one of claims 1 to 6, wherein the valve device is provided with a flange separation mechanism that moves the flange connected to the branching portion in a direction to release the flange.

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