JP6587919B2 - Closure device, and method for removing pipe connecting member using the closure device - Google Patents

Description

  In the present invention, a pipe connecting member coupled to a flange portion disposed around a branch port of an existing fluid pipe is hermetically surrounded by a working case, and the pipe is in an uninterrupted flow state in the working case. The present invention relates to a closing device for sealingly closing a branch port from which a connecting member has been removed, and a method for removing a pipe connecting member using the closing device.

  As a conventional technique, a method of removing a valve lid coupled to a flange of a valve box of a gate valve disposed on a water pipe is a method of dividing a split ring, an attachment, a work on / off valve, a work housing, and a canopy. The box flange and valve lid are hermetically enclosed (hereinafter, “attachment, work on / off valve, work housing and canopy” are referred to as a work case), and then the valve is in a continuous flow state in the work case. The valve lid is removed from the box, the valve body of the valve box from which the valve lid has been removed is sealed in a sealed manner by a valve box water stop jig, and the valve body is mounted by the valve box water stop jig. A plurality of push bolts attached to the attachment are screwed into a plate member attached to the valve box water stop jig while the water stop state of the mouth is maintained, and the valve is Water pressure acting on the box water stop jig It was lifting. Subsequently, in a state where the water stop state of the valve body mounting port portion is maintained, the work on-off valve and the work housing are separated by a predetermined distance, and the gap is formed on the upper surface of the flange of the valve box. After removing the old gasket mounted in the seal mounting groove and cleaning the seal mounting groove, a new gasket was mounted in the seal mounting groove and a new valve lid was mounted. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2015-143562 (pages 14-17, FIGS. 7-10)

  However, in Patent Document 1, a plurality of push bolts attached to the attachment are provided in the circumferential direction at the same height position of the attachment. If it is inserted into the mounting port in a tilted state, the distance between the push bolt and the plate member of the valve case water stop jig will vary, and some of the push bolts will be used for valve case water stop. There is a fear that the plate member of the tool comes into contact with the rest and the rest does not come into contact with the plate member of the valve box water stop jig. When only some of the plurality of push bolts come into contact with the plate member of the valve box water stop jig, a large water pressure acts only on the some push bolts, and the some push bolts and the valve box A valve provided on the water pipe, where the contact surface pressure with the plate member of the water stop jig becomes excessive and galling occurs during the rotation operation of the push bolt, making it impossible to rotate the push bolt. There was a problem that it was impossible to remove and replace the valve lid connected to the box.

  In addition, in Patent Document 1, the work on / off valve and the work housing are spaced from each other by a predetermined distance and are covered with the work on / off valve and the attachment on the upper surface of the flange of the valve box. It is necessary to remove the old gasket from the formed seal mounting groove, clean it, and attach a new gasket to the seal mounting groove. For this reason, the old gasket in the seal mounting groove cannot be sufficiently removed and cleaned, and there is a possibility that the sealing performance cannot be ensured in the water pressure test after the seal mounting of the new gasket.

  The present invention has been made paying attention to such a problem, and even when a closing body that seals the branch port in a sealed manner is inserted at an angle with respect to the branch port, the water pressure acting on the closing body is evenly distributed. A closing device capable of inspecting and cleaning the flange portion in a state where the working case is removed from the flange portion of the existing fluid pipe, and a pipe connecting member using the closing device. The purpose is to provide a removal method.

In order to solve the above problems, the occlusion device of the present invention is
A pipe connection member coupled to a flange portion disposed around the branch port of an existing fluid pipe is hermetically surrounded by a work case, and the pipe connection member is removed in an uninterrupted state in the work case. A closing device for sealingly closing the branched opening, the closing body closing the branch opening, a sealing member for sealing the closing body and the branch opening, and a connection disposed on the closing body And the connection body is connected to the existing fluid pipe outside the branch port.
According to this feature, the fluid pressure acting on the closing body that seals the branch port in a sealed manner can be maintained by connecting the connecting body disposed on the closing body and the existing fluid pipe outside the branch port. The branch port can be sealed without using a working case, and the flange around the branch port can be inspected and cleaned.

The occlusion device of the present invention comprises:
The coupling body includes an extending portion that extends outward in the radial direction of the branch port.
According to this feature, the closing body can be easily connected to the existing fluid pipe by using the extending portion that extends outward in the radial direction of the branch port.

The occlusion device of the present invention comprises:
The coupling body includes a standing portion that is disposed on the closing body and is erected in the axial direction of the branch port.
According to this feature, since the closed body and the connecting portion can be separated by the standing portion, the branch port can be easily inspected and cleaned.

The occlusion device of the present invention comprises:
A plurality of the coupling bodies are disposed apart from each other in the circumferential direction of the branch port.
According to this feature, the inspection and cleaning of the branch port can be easily performed between the connecting portions separated in the circumferential direction.

The occlusion device of the present invention comprises:
The connecting portion includes a bolt insertion hole for coupling with the flange portion of the existing fluid pipe.
According to this feature, even if the closing body is inserted with an inclination with respect to the branch port, the connecting portion of the closing body and the flange of the existing fluid pipe are securely connected to the closing body using the bolt insertion holes. Can be linked to.

The method for removing the pipe connection member using the closure device of the present invention is as follows.
Enclosing a pipe connecting member coupled to a flange portion disposed around a branch port of an existing fluid pipe in a sealed manner with a working case together with the flange portion;
Removing the pipe connecting member from the branch port in an uninterrupted flow state in the working case;
A step of sealingly closing the branch port from which the pipe connecting member has been removed by the closing body;
Connecting the closed body and the existing fluid pipe outside the branch port;
Removing the working case;
It is characterized by having.
According to this feature, the pipe connecting member coupled to the flange portion disposed around the branch port of the existing fluid pipe is enclosed in a sealed manner by the work case together with the flange portion. After removing the pipe connection member from the branch port in the uninterrupted flow state, the branch port is closed in a sealed manner, and the closed body and the existing fluid pipe outside the branch port are connected. Supporting from the tube, the working case can be removed from the existing fluid tube.

(A) is AA sectional drawing of (b), (b) shows the top view of a closure apparatus. It is a figure which shows the state which attached the obstruction | occlusion apparatus to the branch port of the existing fluid pipe | tube. In Example 1, it is a figure which shows the attachment condition of the pipe connection member attached to the branch port of the existing fluid pipe | tube. It is a figure which shows the condition which removed the air valve attached to the branch port of the existing fluid pipe | tube, and attached the working bolt. It is a figure which shows the foundation formed around the existing fluid pipe | tube. It is a figure which shows the state which attached the division | segmentation clamp to the flange part of the branch port of the existing fluid pipe | tube. It is a figure which shows the state which surrounded the pipe connection member couple | bonded with the flange part of the branch port of the existing fluid pipe | tube by the working case in the sealing form. It is a figure which shows the condition which removed the manhole cover in the case for work. It is a figure which shows the state which partitioned off the inside of a working case with a gate valve, and installed the closure device in the working case. It is a figure which shows the state which open | released the gate valve in a working case, and made the obstruction | occlusion device approach into the branch port of the existing fluid pipe | tube. It is a figure which shows the state which positioned the obstruction | occlusion apparatus in the branch port of the existing fluid pipe | tube in the working case. It is a figure which shows the state which connected the connection part of the obstruction | occlusion apparatus, and the flange part of the branch port of the existing fluid pipe | tube, and removed the work case. It is a figure which shows the state which accommodated the obstruction | occlusion apparatus in the work case after checking and cleaning the flange part of the branch port of the existing fluid pipe | tube. It is a figure which shows the state which pulled up the obstruction | occlusion apparatus to the upper part of the working case, and partitioned off the inside of the working case with the gate valve. It is a figure which shows the state which attached the new repair valve and the manhole cover in the working case. (A) is a figure which shows the attachment condition of the pipe connection member attached to the branch port of the existing fluid pipe in Example 2, (b) is a figure which shows the condition replaced | exchanged for the working bolt. It is a figure which shows the state which attached the work valve to the connection part of the flange of a manhole cover, and the flange of a short pipe. It is a figure which shows the state which inserted the valve body of the work valve between the flange of the manhole cover, and the flange of the short pipe. It is a figure which shows the state attached to the water stop flange, the water stop apparatus, and the novel ball valve in the state which inserted the valve body of the work valve between the flange of the manhole cover and the flange of the short pipe. It is a figure which shows the state which inserted the water stop member in the opening part of the human hole cover, and sealed this opening part. It is a figure which shows the state which has arrange | positioned the new packing and the new ball valve in the state which sealed the opening part of the manhole cover. It is a figure which shows the state which attached the new ball valve to the manhole cover of the existing fluid pipe | tube. In another embodiment of the closing device, an embodiment is shown in which a spacing piece is provided on the lower surface of the extending portion of the coupling body.

  EMBODIMENT OF THE INVENTION The form for implementing the obstruction | occlusion apparatus which concerns on this invention, and the removal method of the pipe connection member using this obstruction | occlusion apparatus is demonstrated below based on an Example.

  The occlusion device 10 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the closing device 10 includes a closing body 11 that closes the inside of the branch port 3c, a sealing member 13 that seals the closing body 11 and the branch port 3c, and a flange portion of the closing body 11 and the fluid pipe. And the operation shaft 14 for operating the closure body 11 are mainly provided. Hereinafter, the closing body 11, the connecting body 12, the sealing member 13, and the operation shaft 14 which are main components of the closing device 10 will be described.

  The closing body 11 includes a substantially circular and plate-like first closing member 11a and a second closing member 11b adapted to the shape of the branch port 3c, and will be described later between the first closing member 11a and the second closing member 11b. The sealing member 13 to be compressed is disposed in a predetermined distance so as to be compressed in the thickness direction and bulged in the radial direction. A substantially central portion of the first closing member 11a is formed with a female screw portion 11c having a gap with respect to an inner operation shaft 14b described later and capable of being inserted through the inner operation shaft 14b. The second closing member 11b is formed with an insertion hole 11d for rotatably inserting one shaft end portion 14d of the inner operation shaft 14b described later. The closing body 11 is made of steel, cast iron, stainless steel, ductile cast iron, or the like.

  The connecting body 12 is fixed integrally with the closing body 11, and has a plurality of extending portions 12 a and standing portions 12 b that are arranged apart from each other in the circumferential direction of the closing body 11. The extending portion 12a is a plate-like member having a predetermined width and a predetermined thickness, and extends outward in the radial direction of the branch port 3c. A bolt insertion hole 12h is formed at the radially outer end of the extending portion 12a so as to be coupled to a flange portion 3d of a branch port 3c of an existing fluid pipe, which will be described later. Further, the standing portion 12b is a plate-like member having a predetermined width and a predetermined thickness, is erected in the axial direction of the branch port 3c, and is integrally disposed between the closing body 11 and the extending portion 12a. . In the present embodiment, the extending portions 12a and the standing portions 12b constituting the connecting body 12 are arranged at approximately four equal intervals in the circumferential direction of the closing body 11, but the number of the connecting bodies 12 is as follows. It is determined appropriately according to the fluid pressure acting on the closing body 11. Moreover, the extending part 12a and the standing part 12b which comprise the connection body 12 consist of steel, cast iron, stainless steel, ductile cast iron, etc.

  The sealing member 13 is a substantially cylindrical member made of an elastic material such as natural rubber such as SBR, CR, and NBR, synthetic rubber, or resin, and formed in an endless shape. The sealing member 13 is sandwiched between a first closing member 11a and a second closing member 11b constituting the closing body 11, and by operating an operation shaft 14 described later, the first closing member 11a and the second closing member 11b is compressed and bulges outward in the radial direction, is brought into close contact with the branch port 3c, and seals between the closed body 11 and the branch port 3c.

  The operation shaft 14 is mainly composed of an outer operation shaft 14a and an inner operation shaft 14b. The outer operation shaft 14a is formed of a hollow shaft, and a shaft flange 14c is integrally formed at one end, and the shaft flange 14c is flange-connected to the first closing member 11a by a bolt 19. The inner operation shaft 14b is made of a shaft member, and one shaft end portion 14d of the inner operation shaft 14b is rotatably inserted into the insertion hole 11d of the second closing member 11b, and the inner operation shaft 14b is hollow in the outer operation shaft 14a. It is inserted so that it can move relative to the part with a predetermined gap. Further, a male screw portion 14h is formed on the surface of the inner operation shaft 14b facing the first closing member 11a, and the male screw portion 14h is screwed with the female screw portion 11c of the first closing member 11a. As will be described later, when the inner operation shaft 14b is rotated relative to the flange-coupled outer operation shaft 14a and the first closing member 11a, the female thread portion 11c of the first closing member 11a and the male thread portion 14h of the inner operation shaft 14b. Move relative to each other, and the sealing member 13 is compressed between the first closing member 11a and the second closing member 11b, bulges in the radial direction, and can seal the branch port 3c. The outer operation shaft 14a and the inner operation shaft 14b are sealed at the upper end portion by a sealing member 14e. The outer operation shaft 14a and the inner operation shaft 14b are made of steel, stainless steel, or the like.

  As shown in FIG. 2, the closing device 10 having the above configuration enters the branch port 3 c of the existing fluid pipe 3, and the branch port 3 c is sealed by the sealing member 13. The closing device 10 is configured such that the bolt insertion hole 12h of the extending portion 12a of the connecting body 12 and the bolt insertion hole 3h of the flange portion 3d are connected in the tube axis direction of the branch port 3c by the working bolt 18a and the nut 18b. The fluid pressure acting on the closing body 11 is maintained. The sealing position of the sealing member may be not only the branch port 3c but also the inner peripheral surface of the existing fluid pipe 3.

  As shown in FIG. 2, the closing body 11 of the closing device 10 is configured such that the connecting body 12 extending from the closing body 11 itself and the flange portion 3 d of the existing fluid pipe 3 are connected to each other. Since the fluid pressure acting on the gas is held hermetically, the branch port 3c can be sealed without using a working case. Therefore, even if the working case 25 is removed from the branch port 3c, the sealed state of the branch port 3c can be maintained, and inspection and cleaning can be performed with the flange portion 3d and the flange surface 3f opened. Further, the flange surface 3f of the flange portion 3d and the extending portion 12a of the connecting body 12 are separated from each other by the standing portion 12b standing in the axial direction of the branch port 3c from the closing body 11, so that the flange surface 3f is Inspection and cleaning can be performed over the entire circumference.

  Further, even if the closing body 11 is inserted in a state inclined with respect to the branch port 3c, the working bolt 18a is checked while visually checking the inclination of the closing body 11 with the working case removed from the existing fluid pipe 3. Since the tightening state of the nut 18b can be corrected, the fluid pressure acting on the working bolt 18a and the nut 18b can be made uniform, and the contact surface pressure between some of the working bolts 18a and nut 18b and the closing body 11 is excessive. It is possible to prevent the working bolt 18a and the nut 18b from being galled.

  Hereinafter, as shown in FIG. 3, using the closure device 10, a manhole cover 4 attached to the flange portion 3 d of the branch port 3 c of the existing fluid pipe 3, a repair valve 5 attached to the manhole cover, and A method for removing and replacing the air valve 6 attached with the repair valve 5 in an uninterrupted state will be described below. In this embodiment, each of the manhole cover 4, the repair valve 5 and the air valve 6 corresponds to a pipe connecting member.

  Here, the existing fluid pipes 1, 3, 2 are formed with the receiving portions 1 a, 3 a on one side and the inserting portions 3 b, 2 b on the other side, and are connected to the receiving ports in a sealed manner via the sealing members 3 e, 2 e. Has been. Further, not limited to the receiving port insertion coupling, a flange coupling or a joint ring may be used. The existing fluid pipes 1, 3, and 2 are made of stainless steel, steel, ductile cast iron, polyvinyl chloride, polyethylene, etc., and rust-proof by rubber lining, plastic coating, epoxy resin coating, powder coating, etc. as necessary Has been processed. In this embodiment, the fluid in the fluid pipe is water such as agricultural water, but the fluid flowing in the fluid pipe is not necessarily limited to agricultural water. For example, industrial water, water, sewage, etc., gas Or a gas-liquid mixture of gas and liquid.

  First, as shown in FIG. 4, the bolt / nut 9b (see FIG. 3) is removed, and the air valve 6 (see FIG. 3) is removed. Further, the bolts and nuts 9b that connect the flange portion 3d of the existing fluid pipe 3 and the flange 4d of the manhole cover 4 are replaced with working bolts 18a, nuts 18b, and seal washers 18s. Further, the work bolt may be sealed by providing a water stop member without using the seal washer 18s.

  Next, as shown in FIG. 5, the base pedestal 93 is attached to the existing fluid pipe 3. The base pedestal 93 serves as a base for mounting the split clamp 21 and the work case 25 described later. A jack 92 is disposed on a concrete foundation 91 around the existing fluid pipe 3, and a cross-girder-shaped foundation pedestal 93 is disposed on the jack 92. Further, the level of the base 92 is adjusted by adjusting the height of the jack 92. The concrete foundation 91 is not necessarily provided. Depending on the condition of the ground around the existing fluid pipe and the size of the work case installed on the existing fluid pipe, an iron plate and timber are laid on the excavated ground. Alternatively, the excavated ground may be used, or the existing fluid pipe 3 may be used.

  Next, as shown in FIG. 6, the split clamp 21 is installed on the base pedestal 93 and attached to the flange portion 3 d of the existing fluid pipe 3 through the sealing packing 21 e. The split clamp 21 is divided into two parts so that it can be easily attached around the flange portion 3d of the existing fluid pipe 3, and the clamp pieces are assembled in an annular shape by bolts and nuts 21g. Further, a plurality of holding bolts 29 that advance and retreat in the radial direction of the branch port 3c are attached to the split clamp so as to be spaced apart from each other in the circumferential direction. The holding bolts 29 are screwed toward the manhole cover 4 and The manhole cover 4 is held by holding bolts 29. Thereafter, the nut 18b (see FIG. 4) attached to the work bolt 18a is removed, and the fluid pressure acting on the manhole cover 4 is held by the holding bolt 29. Further, at the lower part of the split clamp 21, an extended portion 21f that comes into contact with the lower surface portion of the flange portion 3d or the lower side of the work bolt 18a extends toward the inner peripheral side of the flange portion 3d. In this embodiment, a bolt 18c that supports the working bolt 18a from below is screwed into the extension portion 21f. Note that the split clamp 21 is not limited to two splits, but may be three or more splits. The split clamp 21 seals the outer periphery of the flange portion 3d of the existing fluid pipe 3 via the packing 21e. However, the split outer peripheral surface of the existing fluid pipe and the lower surface portion of the flange portion 3d may be sealed.

  Next, as shown in FIG. 7, a valve suspension fitting 27 is coupled to the upper flange 5a of the repair valve 5 by bolts and nuts (not shown). Further, a lower working case 22 is assembled on the split clamp 21, a working valve device 23 is assembled on the lower working case 22, and an upper working case 24 is assembled on the working valve device 23. Here, in the present invention, the lower work case 22, the work valve device 23, and the upper work case 24 constitute a work case 25. After the work case 25 is mounted around the manhole cover 4, the repair valve 5 and the valve suspension fitting 27, the valve suspension fitting adapter 27a and the drive adapter 26a are connected from the work hole 24a of the upper work case 24. Thereafter, a lid (not shown) is attached to the work hole 24 a of the upper work case 24, and the manhole cover 4, the repair valve 5, and the valve suspension fitting 27 are sealed in the work case 25.

  Next, as shown in FIG. 8, after water is poured into the working case 25, the holding of the manhole cover 4 by the holding bolt 29 is released. Subsequently, the valve hanger 27, the repair valve 5, and the manhole cover 4 are raised together by the driving machine 26 and moved into the upper work case 24. Then, the upper working case 24 and the lower working case 22 are partitioned by the gate valve 23 b of the work valve device 23. Subsequently, water in the upper working case 24 is drained from a drain port (not shown), a bolt (not shown) for connecting the upper working case 24 and the work valve device 23 is removed, and the upper working case 24 is removed. The valve suspension fitting 27, the repair valve 5, and the manhole cover 4 are accommodated in the case 24 and removed together with the drive unit 26.

  Subsequently, as shown in FIG. 9, the working flange 28 and the closing device 10 are attached to the upper portion of the working valve device 23 in a sealed manner. The operating shaft 14 of the closing device 10 is attached to the working flange 28 in a sealed manner and movably.

  Next, as shown in FIG. 10, the gate valve 23b of the work valve device 23 is housed in the valve box 23a so that the work valve device 23 and the lower work case 22 are communicated with each other. The closing device 10 is caused to enter the branch port 3c. Then, while visually confirming from the confirmation window 22a of the lower working case 22 or the window 28c on the working flange 28, the bolt insertion hole 12h (FIG. 1) of the connecting body 12 of the closing device 10 can be attached to the branch port 3c. The closing body 11 of the closing device 10 is inserted into the working bolt 18a by the operating flange 15 attached to the upper part of the operating shaft 14, the support bolt 28a and the nut 28b attached to the upper part of the working flange 28. It is positioned and fixed by a stroke in the branch port 3c.

  Next, as shown in FIG. 11, the operating end 14 g of the operating shaft 14 is operated to compress the sealing member 13 between the first closing member 11 a and the second closing member 11 b, and the sealing member 13. Is expanded in the radial direction to seal the branch port 3c. Thereafter, the water in the work valve device 23 and the lower work case 22 is drained from a drain (not shown), the confirmation window 22a is opened, the nut 18b is attached to the work bolt 18a, and the closing device 10 is closed. The body 11 is fixed.

  Subsequently, as shown in FIG. 12, the work valve device 23 and the lower work case 22 are removed from the split clamp 21. In this state, the flange surface 3f is inspected and cleaned. In the closing body 11 of the closing device 10, the extending portion 12a of the connecting body 12 extending from the closing body 11 itself and the flange portion 3d of the existing fluid pipe 3 are connected by a working bolt 18a and a nut 18b. Thus, the fluid pressure acting on the closing body 11 is hermetically held, so that the branch port 3c can be sealed without using a working case. Therefore, even if the working case 25 is removed from the branch port 3c, the sealed state of the branch port 3c can be maintained, and inspection and cleaning can be easily performed with the flange portion 3d and the flange surface 3f of the branch port 3c opened. it can. Further, the flange surface 3f of the flange portion 3d and the extending portion 12a of the connecting body 12 are separated from each other by the standing portion 12b standing in the axial direction of the branch port 3c from the closing body 11, so that the flange surface 3f is Inspection and cleaning can be performed over the entire circumference. Furthermore, the split clamp 21 can be removed to facilitate inspection and cleaning.

  Next, after the inspection and cleaning of the flange portion 3d and the flange surface 3f are completed, the work valve device 23 and the lower work case 22 are attached to the split clamp 21 in a sealing manner as shown in FIG. Subsequently, after the operation flange 15 of the operation shaft 14 is fixed by the support bolt 28a and the nut 28b attached to the upper part of the work flange 28, the nut 18b of the work bolt 18a is removed from the confirmation window 22a of the lower work case 22. Remove and seal the confirmation window 22a. Thereafter, water is poured into the work valve device 23 and the lower work case 22, and the operation end 14g of the operation shaft 14 is operated, so that the sealing member 13 between the first closing member 11a and the second closing body is in a natural state. The seal of the branch port 3c is released.

  Subsequently, as shown in FIG. 14, the nut 28 b of the support bolt 28 a that fixes the operation flange 15 attached to the operation shaft 14 is removed, and the moving means (shown in the figure) is used utilizing the internal water pressure or attached to the operation flange 15. The occluding device 10 is gradually moved to the upper part of the work valve device 23. Then, the work valve device 23 and the lower work case 22 are partitioned by the gate valve 23b of the work valve device 23, the work valve device 23 is drained, and the closing device 10 and the work flange 28 are integrally removed. .

  Next, as shown in FIG. 15, the upper working case 24 containing the valve suspension fitting 27, the new repair valve 5, and the manhole cover 4 is mounted on the work valve device 23 together with the drive unit 26. Water is poured into the work case 24, and the gate valve 23b of the work valve device 23 is opened. Then, the drive unit 26 is lowered, and the valve suspension fitting 27, the new repair valve 5 'and the manhole cover 4 are attached to the flange portion 3d of the branch port 3c in an integrated state, and the holding bolt 29 is screwed into the manhole cover. 4 is fixed and the branch port 3c is sealed. Then, the inside of the work case 25 is drained, and the work bolt 18a is tightened from the confirmation window 22a (see FIG. 13) with the nut 18b, and the manhole cover 4 is fixed. At this time, in order to prevent the new human hole cover 4 from being damaged, the human hole cover 4 may be fixed by tightening with the nut 18 b without using the holding bolt 29. Thereafter, the work case 25, the split clamp 21, the base pedestal 93, and the jack 92 are removed. Finally, a new repair valve 5 and a new air valve 6 are installed to complete the operation.

  Next, a method for removing the pipe connecting member using the closing device according to the second embodiment will be described with reference to FIGS. 16 to 22. A human hole cover 4 attached to the flange portion 3d of the branch port 3c of the existing fluid pipe 3, a repair valve 31 and an air valve 6 attached to the repair valve 31 via the short pipes 7 and 8 on the human hole cover 4. A method for exchanging in a continuous flow state using the closure device 10 will be described below. In the first embodiment, the repair valve 5 is directly attached to the manhole cover 4 (see FIG. 3), but in the second embodiment, the repair valve 31 is connected to the manhole cover 4 via the short tubes 7 and 8. Is different (see FIG. 16). When the repair valve 31 is attached to the manhole cover 4 via the short pipes 7 and 8, it is necessary to increase the height of the working case, which makes the work difficult. Therefore, a method for replacing the repair valve 31 and the manhole cover 4 after removing the short pipes 7 and 8 attached to the manhole cover 4 in an uninterrupted state will be described.

  First, as shown in FIG. 16 (b), bolts and nuts for fastening the flange portion 3d of the branch port 3c of the existing fluid pipe 3 and the flange 4d of the manhole cover 4 are used as the working bolt 18a, nut 18b and seal. Replace with washer 18s. Similarly, the bolts and nuts that fasten the flange 4f of the manhole cover 4 and the flange 7f of the short pipe 7 are also replaced with bolts / nuts 9f and a seal washer 9s. A water stop member may be provided on the bolt without using the seal washer 9s.

  Next, as shown in FIG. 17, the repair valve 31 is closed and the air valve 6 is removed. A work valve 33 is attached between the flange 4 f of the manhole cover 4 and the flange 7 f of the short pipe 7. As shown in the encircled portion of FIG. 17, the work valve 33 is divided into three-part structure clamps 33 a, 33 b, so that attachment to the flange 4 f of the manhole cover 4 and the flange 7 f of the short pipe 7 is easy. 33c is joined by bolts and nuts 33g, 33g, and 33g to form a ring. The division structure is not limited to three divisions, and may be two divisions or four or more divisions.

  Subsequently, as shown in FIG. 18, the bolts and nuts 9f that connect the flange 4f of the manhole cover 4 and the flange 7f of the short tube 7 are slightly loosened, and the flange 4f of the manhole cover 4 and the flange 7f of the short tube 7 are then loosened. The handle 33h of the work valve 33 is operated to insert the valve element 33d, the bolt and nut 9f are tightened again, and the flange 4f of the manhole cover 4 is sealed. After sealing the flange 4 f of the manhole cover 4, the repair valve 31 is replaced with a new ball valve 32. The ball valve does not necessarily have to be replaced.

  Next, as shown in FIG. 19, the water stop device 35 is attached to the flange 32 k of the ball valve 32, and the columns 34, 34 are attached to the outer peripheral side of the flange 4 f of the manhole cover 4. Then, the ball valve 32 is opened, the bolt / nut 9f is slightly loosened, the valve element 33d of the work valve 33 is removed from between the flange 4f of the manhole cover 4 and the flange 7f of the short pipe 7, and the bolt / nut 9f is again attached. Tighten.

  Subsequently, the water stop member 35c of the water stop device 35 is pushed into the opening 4c of the manhole cover 4, the diameter of the water stop member 35c is expanded to seal the opening 4c, and the arm 35a is attached to the columns 34 and 34. It is fixed by nuts 35n, 35n,. In a state where the opening 4c of the human hole lid 4 is sealed by the water stop member 35c, the bolt and nut 9f for fastening the flange 4f of the human hole cover 4 and the flange 7f of the short tube 7 are removed, and the short tube 7 and the ball valve 32 are removed. And the water stop device 35 is lifted together, and a gap is provided between the flange 4f of the manhole cover 4 and the flange 7f of the short tube 7. A retaining metal fitting 36 is attached to the gap so that the fluid pressure acting on the water stop member 35c can be maintained.

  As shown in FIG. 21, the short pipe 7, the ball valve 32, and the water stop flange 35d are removed in a state where the fluid pressure acting on the water stop member 35c is held by the retaining fitting 36. Thereafter, a new packing 32e is disposed on the flange 4f of the manhole cover 4, the ball valve 32 is fixed to the water stop flange 35d of the water stop device 35, and the water stop flange 35d is further supported by the arms 35a by the columns 34, 34. To fix.

  Next, as shown in FIG. 22, the retaining metal fitting 36 is removed, and a new ball valve 32 is attached to the flange 4f of the manhole cover 4 with bolts and nuts 9f to release the expanded state of the water stop member 35c. The water stop member 35c is gradually raised and returned to the water stop flange, and the new ball valve 32 is closed. And the working valve 33, the support | pillars 34 and 34, and the water stop apparatus 35 are removed.

  From this state, the manhole cover 4 and the ball valve 32 can be exchanged by performing the steps of FIGS.

  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 implementation, the connecting body 12 of the closing device 10 is connected to the flange portion 3 d of the existing fluid pipe 3. However, the connecting body 12 of the closing device 10 of the present invention is not limited to the flange portion 3d of the existing fluid pipe 3 as long as it is connected to the existing fluid pipe outside the branch port 3c. 3 may be directly connected to the outer peripheral portion. Moreover, an installation seat may be provided in the existing fluid pipes 1, 2, and 3, and the installation seat and the connecting body 12 of the closing device 10 may be connected. Furthermore, an attachment member for sealing the outer peripheral surface of the flange portion 3d of the existing fluid pipe 3 or the lower surface of the flange may be provided, and the attachment member and the connecting body 12 of the closing device 10 may be connected.

  Further, as shown in FIG. 23, the branch port 3c may be closed using a closing device 10 in which a spacing piece 12d is provided on the lower surface of the extending portion 12a of the connecting body 12. The closing device 10 is moved toward the branch port 3c, and the gap is set so that the closing device 10 can be disposed at an appropriate position with respect to the flange 3d at the position where the tip of the spacing piece 12d contacts the flange 3d of the branch port 3c. The length of the piece 12d is set. By using the closing device 10 having such a spacing piece 12d, it is possible to simplify the visual confirmation of the position of the closing device 10 from the confirmation window 22a of the lower working case 22 or the window 28c on the working flange 28.

3 Existing fluid pipe 3c Branch port 3d Flange part 4 Human hole lid (pipe connecting member)
DESCRIPTION OF SYMBOLS 10 Closure apparatus 11 Closure body 12 Connection body 12a Extension part 12b Standing part 12h Bolt insertion hole 13 Sealing member 25 Working case

Claims (5)

A pipe connection member coupled to a flange portion disposed around the branch port of an existing fluid pipe is hermetically surrounded by a work case, and the pipe connection member is removed in an uninterrupted state in the work case. A closing device for sealingly closing the branched opening, the closing body closing the branch opening, a sealing member for sealing the closing body and the branch opening, and a connection disposed on the closing body A connecting body, the connecting body being disposed on the closing body, including a standing portion standing in the axial direction of the branch port, and connected to the existing fluid pipe outside the branch port. An occluding device characterized by that.   The closure device according to claim 1, wherein the connection body includes an extending portion that extends outward in a radial direction of the branch port. Wherein the coupling element is occlusive device of claim 1 or 2, wherein a plurality of disposed spaced apart in a circumferential direction of the branch port. The said connection body contains the volt | bolt insertion hole for couple | bonding with the said flange part of the said existing fluid pipe | tube, The obstruction | occlusion apparatus in any one of Claim 1 thru | or 3 characterized by the above-mentioned. A method of removing a pipe connecting member coupled to a flange portion disposed around a branch port of an existing fluid pipe using the closure device according to any one of claims 1 to 4 ,
Enclosing a pipe connecting member coupled to a flange portion disposed around a branch port of an existing fluid pipe in a sealed manner with a working case together with the flange portion;
Removing the pipe connecting member from the branch port in an uninterrupted flow state in the working case;
A step of sealingly closing the branch port from which the pipe connecting member has been removed by the closing body;
Connecting the closed body and the existing fluid pipe outside the branch port;
Removing the working case;
A method for removing a pipe connecting member, comprising:

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