JP2018080823A - Connection member removal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection member removal method capable of saving power without expanding work scale necessary for removal, to remove a connection member in a non-cutoff state, even with a connection member a part of which is a swollen part.SOLUTION: A connection member removal method can remove a connection member 3 in a non-cutoff state, the connection member including: a body part 5 whose one end is connected to a branch part 1a side branched from a flow passage constitution member 1; and a swollen part communicating with the body part 5 and swollen to the outside of the branch part 1a. The removal method comprises: connecting an on-off valve 8 to the other end side of the body part 5; connecting a sealing member with a sealing coma to the on-off valve 8; inserting the sealing coma into the flow passage constitution member 1 side with respect to the swollen part to seal fluid; removing the swollen part from the body part 5; closing an opening of the body part 5 formed by removing the swollen part, with a lid member 19; surrounding the body part 5 and the on-off valve 8 with a housing 25 in a sealed manner; and removing the body part 5 and the on-off valve 8 in the housing 25.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a removal method for removing a connection member branched and connected from a flow path component member in an uninterrupted state.

  In a conventional connecting member removal device, a casing surrounding, for example, a connecting member for an air valve extending to the branch portion is attached to the branch portion branched from the flow path component member in a sealed manner. In some cases, the inside of the branch portion is sealed by the sealing member inserted into the connector, and the connecting member is removed from the branch portion and removed in this state (see, for example, Patent Document 1).

JP 2007-239860 A (page 6, FIG. 3)

  However, in the method for removing the connection member according to Patent Document 1, there is, for example, a gate valve as the connection member connected to the branch portion, and in particular, an operation of opening and closing the valve body connected to the valve body inside the gate valve. Some of the gate valves, such as a part, have a projecting part that projects in the direction perpendicular to the axis of the branch part. In addition, in such a case, the flow path component member, the branching portion, the manhole cover and the connecting member connected to the branching portion, etc. are aged, and the bolts and nuts cannot be removed due to the occurrence of rust or the short pipe portion may be damaged. In many cases, it is difficult to remove the gate valve itself. When removing such a connecting member, it is necessary to attach a large casing having a diameter larger than that of the branching section in order to surround the gate valve including the overhanging section, and an accessory for supporting the casing. When construction is included, there is a problem that the scale of work required for removal, such as the number of man-hours and cost of removing connection members, may increase.

  The present invention has been made paying attention to such problems, and even if the connecting member has a protruding portion in part, the connecting member can be made labor-saving without enlarging the work scale required for removal. It aims at providing the removal method of the connection member which can be removed in an uninterrupted state.

In order to solve the above-mentioned problem, the method for removing the connecting member of the present invention is:
A connection member comprising a main body having one end connected to a branching portion that branches from the flow path component, and a projecting portion that communicates with the main body and projects outward from the branching portion. A removal method for removing,
While connecting an on-off valve to the other end of the main body, and connecting a sealing member having a sealing piece to the on-off valve,
The main body portion formed by inserting the sealing piece closer to the flow path component member than the overhang portion to seal the fluid, removing the overhang portion from the main body portion, and removing the overhang portion. The opening is closed with a lid member, the main body and the on-off valve are hermetically surrounded by a housing, and the main body and the on-off valve are removed in the housing.
According to this feature, the flow path component member side is sealed by the sealing piece of the sealing member connected to the on-off valve from the overhanging portion of the connecting member connected to the branch portion, so that from the main body portion of the connecting member The overhanging part that protrudes outward can be removed, and the main body of the connection member can be surrounded by a housing with a small internal capacity, so labor savings can be achieved without increasing the work scale required for removal. Can be removed in an uninterrupted state.

The connection member is a gate valve provided with a valve body capable of opening and closing the inside of the main body portion, and the open / close valve is connected to the other end side of the main body portion with the valve body of the gate valve closed. It is said.
According to this feature, the opening / closing valve can be easily connected using the opening / closing function of the gate valve to be removed.

The method for removing the connecting member of the present invention is as follows.
A connection member comprising a main body part having one end connected to the branch part side branched from the flow path component and a projecting part that communicates with the main body part and projects outward from the branch part. A removal method for removing,
Temporarily seal the fluid on the flow path component side than the connection member,
While connecting an on-off valve to the other end of the main body, and connecting a sealing member having a sealing piece to the on-off valve,
The main body portion formed by inserting the sealing piece closer to the flow path component member than the overhang portion to seal the fluid, removing the overhang portion from the main body portion, and removing the overhang portion. The opening is closed with a lid member, the main body and the on-off valve are hermetically surrounded by a housing, and the main body and the on-off valve are removed in the housing.
According to this feature, even when opening and closing in the branch portion by the connecting member is impossible, the fluid on the flow path component side of the connecting member is temporarily sealed, the open / close valve is connected to the connecting member, and the branch portion is connected. By sealing the flow path component member side from the overhanging portion of the connecting member with a sealing member connected to the on-off valve, the overhanging portion protruding outward from the main body portion of the connecting member can be removed and connected. Since the main body of the member can be surrounded by a housing having a small internal capacity, the connection member can be removed in an uninterrupted state without saving the work scale required for removal without increasing the work scale.

The main body portion of the connecting member is located on the inner diameter side of the outer peripheral edge of the branch portion.
According to this feature, since the main body portion remaining after removing the overhanging portion is located on the inner diameter side with respect to the outer peripheral edge of the branch portion, the outer dimensions of the casing attached to the branch portion can be suppressed.

The opening / closing valve is connected to an accommodating portion capable of accommodating the sealing piece in a sealed manner.
According to this feature, the sealing member in which the sealing piece is accommodated in the accommodating portion can be attached and detached without leakage while the on-off valve is closed.

The on-off valve has a rotary valve body.
According to this feature, since the on-off valve has a rotary valve body, the outer shape of the on-off valve can be made compact without projecting in the outer diameter direction as a movement allowance of the valve body. The external dimensions of the body can be suppressed.

The method for removing the connecting member of the present invention is as follows.
After providing a reinforcing member on the outer surface of the manhole cover or the connecting member closer to the flow path component member than the overhanging portion, the sealing piece is inserted closer to the flow path component member than the overhanging portion. It is characterized by sealing the fluid.
According to this feature, since the reinforcing member is provided on the outer surface of the manhole cover or the connection member on the flow path component member side from the overhanging portion, the structural strength of the manhole cover or the connection member can be increased. The fluid can be reliably sealed by the member.

It is a figure which shows the state in which the gate valve and the air valve were attached to the branch part of the fluid pipe | tube in Example 1. FIG. It is a figure which shows the state which replaced with the air valve of FIG. 1, and attached the repair valve. It is a figure which shows the state which attached the endoscopic apparatus to the repair valve of FIG. It is a figure which shows the state which replaced with the endoscopic apparatus of FIG. 3, and attached the discharge device. It is a figure which shows the state which replaced with the discharge | emission apparatus of FIG. 4 and installed the frame | top | piece interior apparatus, and obstruct | occluded the main-body part of the gate valve. It is a figure which shows the state which retreated the placing frame of the placing frame interior apparatus. It is a figure which shows the state which removed the placing frame interior apparatus of FIG. It is a figure which shows the state which attached the division member and the lower work case to the branch part. It is a figure which shows the state which attached the housing | casing and the drive machine to the branch part. It is a figure which shows the state which raised the repair valve, the gate valve, and the manhole cover with the drive machine. It is a figure which shows the state which replaced with the upper work case of FIG. 10, and attached the closure device, and obstruct | occluded the branch part. It is a figure which shows the state which attached the new repair valve and the manhole cover with the drive machine. It is a figure which shows the state which removed the housing | casing and the drive device of FIG. It is a figure which shows the state which attached the air valve to the repair valve of FIG. It is a figure of the process which can be incidental to Example 1, and is a figure which shows the state which attached the repair cover to the manhole cover. It is a figure of another process which can be incidental to Example 1, and is a figure which shows the state which attached the slide plate valve to the gate valve and the manhole cover. (A) is a figure of another process which can be incidental to Example 1, and is a front view which shows the state which attached the high nut to the flange of the manhole cover, (b) is also a side view. (A) is a figure which shows the state which attached the division member to the branch part of the fluid pipe | tube in Example 2, (b) is the principal part enlarged view similarly.

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

  The connection member removal method according to the first embodiment will be described in the order of steps with reference to FIGS. 1 to 14. The connection member removal method of the present embodiment includes a human hole lid 2 having one end attached to a branch portion 1a of an existing fluid pipe 1 (hereinafter simply referred to as a fluid pipe 1) as a flow path component, and the human hole cover. 2 is a method of removing and replacing the gate valve 3 as a connecting member attached to the other end of the air valve 2 and the air valve 4 attached to the gate valve 3 in an uninterrupted state. In this embodiment, the gate valve 3 constitutes a connection member according to the present invention.

  As shown in FIG. 1, the fluid pipe 1 of the present embodiment has a relatively large diameter through which a worker or the like can enter and exit through a branch part 1 a that branches from the main pipe part 1 c, and is particularly illustrated. However, a receiving part is formed at one end of the main pipe part 1c, and an insertion part is formed at the other end, and the receiving part is sealed through a flow path component such as an adjacent fluid pipe and a sealing member. Incision combined. Moreover, not only a receiving port insertion coupling | bonding but a flange coupling | bonding or a joint ring may be used, or welding joining may be sufficient.

  The fluid pipe 1 is made of stainless steel, steel, ductile cast iron, vinyl chloride, polyethylene, or the like, and is rust-proofed by rubber lining, plastic coating, epoxy resin coating, powder coating, or the like as necessary. 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.

  Further, in this embodiment, the members are “connected” as long as the insides of the members are connected to each other in a communication state. It also implies an aspect in which another member that communicates with the inside of a pipe, a different diameter pipe, or the like is interposed and connected.

  The manhole cover 2 has a large diameter flange 2b connected to the flange 1b of the branch portion 1a at one end, a small diameter flange 2a at the other end, and a short pipe portion 2c between the flanges 2a and 2b. It is formed as a short diameter tube.

  The gate valve 3 is connected to the flange 2a of the manhole cover 2 and communicates with the branch portion 1a, and is connected to the flange 5c on the side of the body portion 5 so as to be outside of the flange 1b of the branch portion 1a. And the valve body 7 which is connected to the operation section 6 and can open and close the main body section 5. That is, the gate valve 3 is configured such that an internal space formed by the main body portion 5 and the operation portion 6 can be opened and closed by the valve body 7. In this embodiment, the operation unit 6 constitutes the overhanging portion according to the present invention.

  Since the valve body 7 of the gate valve 3 is operated to be opened and closed relatively little and is always used in an open state, rusting or the like may occur due to long-term use, and the opening and closing operation may be impossible in the open state. However, in this embodiment, the description will be made on the assumption that the gate valve 3 can be opened and closed.

  First, the internal valve body 7 is closed using the operation handle 6a of the operation unit 6 shown in FIG. Remove.

  As shown in FIG. 2, the repair valve 8 is attached to the flange 5 b of the main body 5 in place of the air valve 4. In addition, the repair valve 8 can open and close a rotary valve body (not shown) by an operation portion 8a. In this embodiment, the repair valve 8 constitutes an on-off valve according to the present invention.

  Thus, the connection member according to the present embodiment is the gate valve 3 including the valve body 7 that can be opened and closed in the main body 5, and the main body 5 in the state in which the valve body 7 of the gate valve 3 is closed. By connecting the repair valve 8 (open / close valve) to the other end of the valve, the repair valve 8 can be easily connected using the open / close function of the gate valve 3 to be removed.

  As shown in FIG. 3, a short tube 9 is hermetically connected to the repair valve 8, and an endoscopic device 30 is hermetically connected to the short tube 9. The endoscope apparatus 30 is mainly configured by an endoscope 32 attached to the tip of a shaft body 31 and an advance / retreat operation section 33 capable of moving the shaft body 31 in the direction of the branch portion 1a of the fluid pipe 1. The

  After connecting the endoscopic device 30, the valve body of the repair valve 8 and the valve body 7 of the gate valve 3 are opened, the shaft body 31 is advanced by the advance / retreat operation unit 33, and the endoscope 32 at the tip of the shaft body 31 is partitioned. The state of attachment of rust and impurities attached to the inner surface of the valve 3, the manhole cover 2 or the branching portion 1a is visually confirmed by a monitor (not shown) connected to the endoscope 32 with a cable or the like. After visual recognition by the endoscopic device 30, the shaft body 31 is retracted to close the valve body of the repair valve 8, and the endoscopic device 30 is removed from the short tube 9.

  Next, as shown in FIG. 4, the discharge device 35 is connected to the short tube 9 in a sealed manner instead of the endoscope device 30. The discharge device 35 is mainly composed of a small-diameter pipe 36 whose both ends are open, and a flexible part 37 that allows the small-diameter pipe 36 to pass through in a sealing manner so that the small-diameter pipe 36 can be advanced and retracted and tilted toward the branch portion 1a.

  After connecting the discharge device 35, the valve body of the repair valve 8 is opened, the distal end side of the small diameter pipe 36 is advanced, and the valve 38 at the rear end of the small diameter pipe 36 located outside the flexible portion 37 is opened. Using the fluid pressure in the fluid pipe 1, rust and other foreign substances adhering to the inner surface of the gate valve 3, the manhole cover 2, or the branching portion 1 a previously confirmed by the endoscope 30 are discharged to the outside together with the fluid in the pipe. To do. After the contaminants are discharged by the discharge device 35, the small diameter tube 36 is retracted into the short tube 9 to close the valve body of the repair valve 8, and the discharge device 35 is removed from the short tube 9. In addition, it is preferable that a member that scrapes off foreign matters is provided on the distal end side of the small-diameter pipe 36, and the foreign matters are discharged by the member.

  Next, as shown in FIG. 5, instead of the discharge device 35, the frame interior device 10 is sealed and connected to the short tube 9. The placing piece interior device 10 is attached to the placing piece 12 attached to the tip of the shaft body 11, the flange 13 that penetrates the shaft body 11 in a sealing manner and connected to the short tube 9, and the rear end of the shaft body 11. And the guide shafts 15, 15 which are provided upright on the flange 13 and through which both ends of the operation unit 14 penetrate. Further, the shaft body 11 has a double pipe structure in which the inner cylinder pipe is inserted into the outer cylinder pipe, although not shown in particular, and the tips of these pipes pivot on the placing piece 12 made of an elastic annular body. It has a structure that can be clamped in the direction. In this embodiment, the placing piece interior device 10 constitutes a sealing member according to the present invention, and the placing piece 12 constitutes a sealing piece according to the present invention.

  After connecting the placing piece interior device 10, the valve body of the repair valve 8 is opened, and the operating portion 6 is pushed downward along the guide shafts 15 and 15 to cause the shaft body 11 to enter, In the present embodiment, the position of the placing piece 12 in the axial direction is arranged closer to the manhole cover 2 inside the main body portion 5 of the gate valve 3.

  The position of the placing piece 12 in the axial direction is at least a predetermined position closer to the fluid pipe 1 than the operating portion 14 so that the operating portion 14 and the valve body 7 can be removed while the placing piece 12 is sealed. For example, as described later, it may be a position in contact with the short tube portion 2c of the human hole lid 2.

  Next, by rotating the rotating portion 11 a provided at the rear end of the inner cylinder pipe of the shaft body 11, the placing piece 12 is moved between the outer cylinder pipe and the inner cylinder pipe constituting the shaft body 11. As a result of being pinched in the direction and elastically deforming in the outer diameter direction, the inside of the gate valve 3 is sealed. More specifically, the placing piece 12 is elastically deformed in the diameter increasing direction on the fluid pipe 1 side with respect to the operation unit 6 in the main body 5 and is in a sealed state in close contact with the inner surface of the main body 5.

  As shown in FIG. 5, the operation portion 6 and the valve body 7 connected thereto are removed from the flange 5 c of the main body portion 5 of the gate valve 3 in a sealed state by the placing piece 12. Thus, by removing the operation part 6 and the valve body 7, an opening is formed in the flange 5c of the main body part 5.

  Subsequently, as shown in FIG. 6, the flat cover member 19 is connected in a sealing manner to the flange 5 c of the main body 5 of the gate valve 3, thereby closing the opening formed in the main body 5. Next, the placing piece 12 is retracted into the short pipe 9 to close the valve body of the repair valve 8 and the placing piece interior device 10 is removed from the short pipe 9. In the present embodiment, the short tube 9 constitutes the accommodating portion according to the present invention.

  In this way, the short valve 9 (accommodating portion) capable of accommodating the placing piece 12 in a sealed manner is connected to the repair valve 8, so that the placing piece 12 is placed on the short pipe 9 with the repair valve 8 closed. Can be attached and detached without leakage.

  Next, the existing bolt nut 50 (see FIG. 6) which connected the flange 1b of the branching portion 1a and the flange 2b of the manhole cover 2 is removed, and as shown in FIG. The bolt replacement operation for attaching the nut 51 and the guide bolt nut 52 having a long neck is sequentially performed. The guide bolt nuts 52 are attached at predetermined intervals in the circumferential direction of the flanges 1b and 2b, and the work bolt nuts 51 are attached to the remaining portions. The bolt heads of the work bolt nut 51 and the guide bolt nut 52 are arranged on the lower surface of the flange 1b of the branch portion 1a. Although not particularly shown, these bolt heads and the lower surface of the flange 1b A sealing member such as a water stop washer is interposed between the two.

  As shown in FIGS. 8 and 17, the base pedestal 93 is attached to the fluid pipe 1. The base pedestal 93 is configured as a base part for attaching a split member 21 and a housing 25 described later. A jack 92 is arranged on a foundation 91 made of concrete, excavated ground, backfill soil, etc. around the fluid pipe 1, and a foundation pedestal 93 having a planer girder shape is arranged on the jack 92 (see FIG. 17). ). Further, the level of the base 92 is adjusted by adjusting the height of the jack 92. The foundation 91 is not necessarily provided, and an iron plate or timber may be laid on the excavated ground according to the condition of the ground around the fluid pipe 1 and the size of the work case installed on the fluid pipe 1. The excavated ground may be used, or the fluid pipe 1 may be used.

  Next, as shown in FIG. 8, the dividing member 21 is installed on the base pedestal 93 and attached to the flange 1 b of the branch portion 1 a of the fluid pipe 1 through the sealing packing 21 e. The split member 21 is composed of clamp pieces that are divided into two in the circumferential direction so that the split member 21 can be easily attached around the flange 1b of the fluid pipe 1, and the split clamp pieces are integrally and annularly formed by bolts and nuts (not shown). Assembled. The dividing member 21 is not limited to two divisions, and may be three or more divisions.

  Further, a plurality of holding bolts 29 that are advanced and retracted in the radial direction of the branching portion 1a are attached to the dividing member 21 so as to be spaced apart from each other in the circumferential direction, and the holding bolts 29 are screwed toward the manhole cover 2. The human hole lid 2 is held. Thereafter, the nut attached to the bolt is removed from the working bolt nut 51 and the guide bolt nut 52, and the fluid pressure acting on the manhole cover 2 is held by the holding bolt 29.

  Further, at the lower part of the dividing member 21, an extending portion 21f that contacts the lower surface of the flange 1b or the lower side of the bolt extends to the inner peripheral side of the flange 1b. In this embodiment, a bolt 53 that supports the work bolt nut 51 and the guide bolt nut 52 from below is screwed into the extending portion 21f. In addition, although the division member 21 has sealed the outer peripheral surface of the flange 1b of the fluid pipe | tube 1 via the packing 21e, you may seal the lower surface of the flange 1b, for example.

  As shown in FIG. 8, the lower working case 22 is assembled on the divided member 21 assembled in close contact with the flange 1 b of the branching portion 1 a in an integral annular shape. The lower work case 22 is formed in a cylindrical body provided with a confirmation window 22a through which the inside can be visually confirmed and a cleaning tool 22b capable of cleaning impurities and the like.

  Next, as shown in FIG. 9, the valve suspension fitting 27 is coupled to the upper flange of the repair valve 8 by a bolt and nut 28, and the work valve device 23 is assembled on the lower work case 22. Further, the upper working case 24 is assembled on the work valve device 23, and the drive unit 26 is assembled on the upper working case 24. In the present embodiment, the dividing member 21, the lower work case 22, the work valve device 23, and the upper work case 24 constitute a housing 25 according to the present invention. After mounting the housing 25 around the manhole cover 2, the body portion 5 of the gate valve 3, the repair valve 8, and the valve suspension fitting 27, the valve suspension fitting 27 and the drive adapter are inserted from the work hole 24 a of the upper working case 24. 26a is connected. Thereafter, a lid 24 b is attached to the work hole 24 a of the upper work case 24, and the manhole cover 2, the main body portion 5 of the gate valve 3, the repair valve 8, and the valve suspension fitting 27 are sealed in the housing 25.

  In this way, the fluid pipe 1 (flow path component) side of the gate valve 3 (connecting member) connected to the branching portion 1a is connected to the repair valve 8 (open / close valve) from the operation portion 6 (extension portion). By sealing with the placing piece 12 (sealing piece) of the placed placing piece interior device 10 (sealing member), the operation portion 6 protruding outward from the main body portion 5 of the gate valve 3 can be removed. Since the main body 5 can be surrounded by the casing 25 having a small internal capacity, the work valve required for removal can be saved without increasing the size of the work, and the gate valve 3 can be removed in a continuous flow state.

  Moreover, since the main body part 5 of the gate valve 3 to which the operation part 6 is removed and the lid member 19 is attached is located on the inner diameter side with respect to the outer peripheral edge of the branch part 1a, the housing 25 attached to the main body part 5 External dimensions can be reduced.

  Further, as described above, since the repair valve 8 has a rotary valve body, the outer shape of the repair valve can be made compact without projecting in the outer diameter direction as a movement margin of the valve body. The outer dimension of the housing 25 to be reduced can be suppressed.

  Next, as shown in FIG. 10, after water is poured into the housing 25, the holding of the manhole cover 2 by the holding bolt 29 is released. Subsequently, the valve suspension fitting 27, the repair valve 8, the main body portion 5 of the gate valve 3 and the manhole cover 2 are raised together by the driving machine 26 and moved into the upper working 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 that connects the upper working case 24 and the working valve device 23 is removed, and a valve is placed in the upper working case 24. The suspension fitting 27, the repair valve 8, the main body 5 of the gate valve 3 and the manhole cover 2 are removed together with the drive unit 26.

  Subsequently, as shown in FIG. 11, the working flange 48 and the closing device 40 are attached to the upper portion of the working valve device 23 in a sealed manner. As will be described later, the closing device 40 mainly includes a closing body 41 that closes the inside of the branching portion 1 a and an operation shaft 44 whose tip is connected to the closing body 41. The operating shaft 44 of the closing device 40 is attached to the working flange 48 in a sealed manner and movably.

  Next, the gate valve 23b of the work valve device 23 is accommodated in the valve box 23a, the inside of the work valve device 23 and the inside of the lower work case 22 are communicated, and the closing device 40 is branched by a moving means (not shown). Enter 1a. Then, while visually confirming from the confirmation window 22a of the lower working case 22 or the window 48a on the working flange 48, the bolt insertion hole of the connecting body 42 connected to the closing body 41 of the closing device 40 is provided in the branch portion 1a. The closing bolt 41a of the closing device 40 is inserted into the working bolt 51a attached to the operating shaft 44 by the operating flange 45 attached to the upper portion of the operating shaft 44 and the support bolt nut 46 attached to the upper portion of the working flange 48. Is positioned and fixed in the branch part 1a by a stroke.

  Next, as shown in FIG. 11, the operating end 44 a of the operating shaft 44 is rotated, and the sealing member 43 is moved between the first closing member 41 a and the second closing member 41 b constituting the closing body 41. The branch part 1a is sealed by compressing and expanding the sealing member 43 in the radial direction. Thereafter, the water in the work valve device 23 and the lower work case 22 is drained from a drain port (not shown), the confirmation window 22a and the like are opened, a nut is fastened to the work bolt 51a, and the closing device 40 The blocking body 41 is fixed.

  Next, the opened upper surface of the flange 1b of the fluid pipe 1 is visually inspected from the confirmation window 22a of the lower work case 22, and the packing that has sealed the flange 2b of the manhole cover 2 is removed. . If foreign matter such as packing pieces or rust adheres to the upper surface of the flange 1b, the packing piece or rust and other foreign matters are removed by the cleaning tool 22b of the lower work case 22, and the upper surface of the flange 1b is cleaned. To do. Note that suction means (not shown) may be connected to the working flange 48 and the like, and foreign matter may be sucked by the suction means. Further, when removing the packing or removing impurities such as packing pieces and rust, the closing device 40, the work valve device 23 and the lower work case 22 may be removed.

  Next, after the inspection of the flange 1b and its upper surface, the removal of the packing and foreign substances and the cleaning are completed, the connection of the connecting body 42 is released, water is poured into the work valve device 23 and the lower work case 22, and the operation shaft 44 is removed. The operating end portion 44a is rotated to return the sealing member 43 between the first closing member 41a and the second closing member 41b to a natural state, and the sealing of the branch portion 1a is released.

  Subsequently, as shown in FIG. 11, the support bolt nut 46 for fixing the operation flange 45 attached to the operation shaft 44 is removed, and the moving means (not shown) using the internal water pressure or attached to the operation flange 45. Thus, the closing device 40 is gradually moved to the upper part in 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 40 and the work flange 48 are removed.

  Next, as shown in FIG. 12, an upper working case 24 containing a valve 26, a new repair valve 17, and a new manhole cover 16 is mounted on the work valve device 23 together with the drive unit 26. Attach and pour water into the upper work case 24 to open the gate valve 23b of the work valve device 23. Then, the drive unit 26 is lowered, and the valve suspension fitting 27, the new repair valve 17 and the manhole cover 16 are integrally attached to the flange 1b of the branch portion 1a, and the holding bolt 29 is screwed into the manhole cover 16. Is fixed and the branch part 1a is sealed. At this time, a packing for sealing the flange 1b is provided on the lower surface of the manhole cover 16. The repair valve 8 used above is not necessarily limited to the one that uses the new repair valve 17, and may be reused.

  And the inside of the housing | casing 25 is drained, the work bolt nut 51 and the guide bolt nut 52 are fastened from a confirmation window etc., and the manhole cover 16 is fixed. At this time, in order to prevent the new human hole lid 16 from being damaged, the human hole lid 16 may be fixed by tightening with a nut without using the holding bolt 29.

  Thereafter, as shown in FIG. 13, the casing 25, the base pedestal 93, and the jack 92 are removed while leaving the manhole cover 16 and the repair valve 17 connected to the flange 1 b. Finally, as shown in FIG. 14, the work bolt nut 51 and the guide bolt nut 52 are replaced with a standard new bolt nut 56, and a new air valve 18 is attached to the repair valve 17 to complete the work.

  Next, with reference to FIG. 15, processes that can be attached to the above-described embodiment will be described.

  Before the step (see FIG. 5) of using the placing frame interior device 10 as the sealing member described above, as shown in FIG. 15, the short pipe portion 2c of the manhole cover 2, the flange 2a and the gate valve 3 A repair cover 60 that covers these outer peripheries is fixedly installed by welding or the like over the lower part of the main body 5. The repair cover 60 is erected from the upper surface of the flange 2b of the manhole cover 2, and includes a side wall portion 61 that covers the short pipe portion 2c, the flange 2a, and the side of the flange 5a of the main body portion 5 of the gate valve 3, and the side wall portion. The upper wall portion 62 is provided continuously with the flange 5a and covers the upper portion of the flange 5a. The interior space of the repair cover 60 is filled with a filler M such as a curable resin. In this embodiment, the repair cover 60 and the filler M constitute a reinforcing member according to the present invention. The repair cover 60 does not necessarily have to cover the flange 2a and the flange 5a, and may use the outer surface of the manhole cover and the connecting member.

  In this step, since the repair cover 60 is provided as described above and the internal space is filled with the filler M, the structural strength of the main body portion 5 and the short pipe portion 2c can be reinforced. When the placing piece interior device 10 is used, when the placing piece 12 is bulged in the radial direction and brought into close contact with the inner peripheral surface of the short pipe portion 2c, the short pipe portion 2c may be damaged unexpectedly due to corrosion deterioration or the like. Can be avoided.

  Thus, by providing the repair cover 60 (reinforcing member) on the outer surface of the branching portion 1a and the filler M (reinforcing member) in the inner space, the structural strength on the fluid pipe 1 side can be increased more than the operation portion 6. Therefore, the inside of the branch part 1a can be reliably sealed by the placing piece 12 of the placing piece interior device 10.

  Next, with reference to FIG. 16, another process that can be attached to the above-described embodiment will be described.

  In this embodiment, as shown in FIG. 1, a process of connecting the repair valve 8 by closing the valve body 7 of the gate valve 3 maintaining the internal opening / closing function as a connecting member is configured. When the valve body 7 of the valve 3 is left in the open state for a long time and becomes rusted, it may become impossible to close, or a member that does not have a valve body from the beginning may be configured as a connecting member. . In such a case, a slide plate valve 65 that covers the outer periphery of the flange 5a of the main body 5 of the gate valve 3 and the flange 2a of the manhole cover 2 is provided.

  As shown in FIG. 16, the slide plate valve 65 has split cases 66 and 67 having a split structure in the circumferential direction so that attachment to the flange 2 a of the manhole cover 2 and the flange 5 a of the main body 5 is easy. They are joined together by bolts and nuts to form an integral ring. One split case 66 is configured to be able to store the valve element 69 and to be advanced and retracted by the handle 68. The division structure may be a predetermined number of two or more divisions.

  Subsequently, the bolt nut 54 that connects the flange 2a of the manhole cover 2 and the flange 5a of the main body portion 5 is slightly loosened, and the handle 68 of the slide plate valve 65 is operated between these flanges 2a and 5a to operate the valve element 69. The bolt nut 54 is tightened again, and the flange 2a of the manhole cover 2 is sealed.

  That is, in this process, the valve element 69 of the slide plate valve 65 is inserted between the flanges 2a and 5a to be in a sealed state, and the repair valve 8 is attached to the main body 5 in this sealed state. Thereafter, the valve body 69 of the slide plate valve 65 is returned into the split case 66 to be in an open state, and the slide plate valve 65 is removed, so that the process shown in FIG.

  Thus, even when opening and closing in the branch portion 1a by the gate valve 3 is impossible, as in the above-described first embodiment, labor is saved without enlarging the work scale required for removal, and the connecting member is in an uninterrupted state. Can be removed.

  Next, with reference to FIG. 17, another process that can be attached to the above-described embodiment will be described.

  FIG. 17 shows a state in which the jack 92, the base pedestal 93, and the split member 21 are provided on the foundation from the state shown in FIG. 7, and the flange 1b of the branch portion 1a and the flange 2b of the manhole cover 2 are A bolt nut 51 and a guide bolt nut 52 are provided, and a high nut 55 extending from the upper end of the split member 21 is further provided above the flange 2b. The high nut 55 includes a nut portion 55a having the same specifications as the nuts of the work bolt nut 51 and the guide bolt nut 52 at the upper end thereof.

  In this step, since the high nut 55 is provided as described above, the nut portion 55a can be rotated with a tool such as a wrench above the split member 21, so that the work bolt nut 51 and the guide bolt nut 52 are tightened. Work can be done easily.

  Next, the connection member removal method according to the second embodiment will be described with reference to FIG. In this embodiment, a split member 71 described later is configured instead of the split member 21 described above, and other configurations are the same as those of the first embodiment. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 18 (a), the dividing member 71 constituting the working case of the present embodiment is formed on the outside of the flange 1b of the branch part 1a, the flange 2b of the manhole cover 2, and a part of the short pipe part 2c. A cylindrical body 72 having a holding bolt 29 and a divided body 73 having a divided structure divided in the circumferential direction, and a divided clamp 73 connected to the lower end of the cylindrical body 72, and also divided in the circumferential direction. A push ring 74 that is an annular body having a structure and is connected to the lower end of the split clamp 73. Although not particularly illustrated, the lower working case 22 is connected to the upper end of the cylindrical body 72 in the same manner as in the first embodiment.

  More specifically, as shown in FIG. 18B, a relatively large flange 73c is formed on the upper end of the split clamp 73 so as to protrude and extend in the outer peripheral direction. Further, a relatively small flange 73a is formed at the lower end of the split clamp 73 so as to protrude and extend in the outer peripheral direction. A plurality of communication holes communicating in the vertical direction are formed on the outer peripheral portion of the lower surface of the flange portion 73a at predetermined intervals in the circumferential direction. On the other hand, on the inner peripheral surface of the flange portion 73a, a groove-like groove portion 73b is formed in which the lower end side gradually increases in diameter and extends in the circumferential direction. The groove 73b is fitted with a packing 75 made of a substantially annular elastic body having a substantially circular cross section and inscribed in the outer peripheral surface of the branching portion 1a. The packing 75 of the present embodiment has a substantially circular cross section, but may be formed in an elliptical shape, a substantially C shape, or a rectangular shape, for example. Thereby, the branch part 1a can be enclosed and sealed.

  In addition, a plurality of communication holes communicating in the vertical direction are formed in the outer peripheral portion of the press wheel 74 in the circumferential direction so as to correspond to the communication holes of the flange portion 73a, and the flange portion 73a and the press wheel 74 are bolt nuts. 76 is connected. Further, the pusher wheel 74 is configured to be divided into two substantially evenly in the circumferential direction of the branch portion 1a. Although not particularly shown, a packing is interposed in the divided portion and joined in a sealed manner by a bolt and nut. Thereby, since the push ring 74 can be fitted from the outer peripheral side of the branch part 1a, the attachment work of the push ring 74 can be made easy.

  Then, by tightening the bolt nut 76 that connects the flange portion 73a and the press wheel 74, the inner peripheral portion of the upper surface of the press wheel 74 is in close contact with the packing 75, and the packing 75 is pushed into the inner peripheral surface of the groove portion 73b. The dividing member 71 and the branching portion 1a constituting the working case are brought into close contact with each other via the packing 75.

  A plurality of female screw portions 73d are provided along the circumferential direction on the upper surface of the collar portion 73c of the split clamp 73, and a height adjusting screw 77 is screwed into the female screw portion 73d. In this way, the height adjustment screw 77 can be screwed into the female screw portion 73d and adjusted to an appropriate height position, so that the upper end of the height adjustment screw 77 contacts the lower end of the flange 1b of the branch portion 1a. In addition to being able to position the split member 71 in the height direction with respect to the branching portion 1a, the flanges 1b and 2b can be sandwiched between the height adjusting screw 77 and the holding bolt 29.

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

  For example, in the above-described embodiment, as illustrated in FIG. 1, the state in which the air valve 4 is attached to the gate valve 3 as a connection member has been described as an example. However, for example, a fire hydrant is connected to the connection member via a piping member. It may be attached.

1 Fluid pipe (flow path component)
2 Human hole lid 3 Gate valve (connecting member)
4 Pneumatic valve 5 Body 6 Operation part (overhang part)
7 Valve body 8 Repair valve (open / close valve)
9 Short pipe (container)
10 Place top interior device (sealing member)
12 Place top (sealed top)
16 Manhole cover 17 Repair valve 18 Air valve 19 Lid member 21 Dividing member 22 Lower work case 23 Work valve device 24 Upper work case 25 Housing 26 Drive 29 Holding bolt 30 Endoscope 35 Discharge device 40 Closure device 50 Existing bolt nut 51 Working bolt nut 52 Guide bolt nut 55 High nut 56 New bolt nut 60 Repair cover (reinforcing member)
71 Dividing member M Filler (reinforcing member)

Claims (7)

A connection member comprising a main body having one end connected to a branching portion that branches from the flow path component, and a projecting portion that communicates with the main body and projects outward from the branching portion. A removal method for removing,
While connecting an on-off valve to the other end of the main body, and connecting a sealing member having a sealing piece to the on-off valve,
The main body portion formed by inserting the sealing piece closer to the flow path component member than the overhang portion to seal the fluid, removing the overhang portion from the main body portion, and removing the overhang portion. And closing the opening with a lid member, sealing the body portion and the on-off valve with a housing, and removing the body portion and the on-off valve within the housing. .   The connection member is a gate valve provided with a valve body capable of opening and closing the inside of the main body portion, and the open / close valve is connected to the other end side of the main body portion with the valve body of the gate valve closed. The removal method of the connection member of Claim 1. A connection member comprising a main body part having one end connected to the branch part side branched from the flow path component and a projecting part that communicates with the main body part and projects outward from the branch part. A removal method for removing,
Temporarily seal the fluid on the flow path component side than the connection member,
While connecting an on-off valve to the other end of the main body, and connecting a sealing member having a sealing piece to the on-off valve,
The main body portion formed by inserting the sealing piece closer to the flow path component member than the overhang portion to seal the fluid, removing the overhang portion from the main body portion, and removing the overhang portion. And closing the opening with a lid member, sealing the body portion and the on-off valve with a housing, and removing the body portion and the on-off valve within the housing. .   The method for removing a connection member according to claim 1, wherein the main body portion of the connection member is located on an inner diameter side with respect to an outer peripheral edge of the branch portion.   The method for removing a connecting member according to claim 1, wherein an accommodating portion capable of accommodating the sealing piece in a sealed manner is connected to the on-off valve.   The method for removing a connection member according to claim 1, wherein the on-off valve has a rotary valve body.   After providing a reinforcing member on the outer surface of the manhole cover or the connecting member closer to the flow path component member than the overhanging portion, the sealing piece is inserted closer to the flow path component member than the overhanging portion. The method for removing a connecting member according to claim 1, wherein the fluid is sealed.

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