JP5117866B2 - Branch pipe removal method and branch port sealing device - Google Patents

Description

The invention also relates to a removing method of the branch pipe connected via a gate valve apparatus in the fluid tube, sealed equipment of the branch port to be used in the method.

  When renewing an existing water pipe (an example of a fluid pipe) that has become obsolete, in consideration of convenience for users of tap water, the state of uninterrupted water is maintained without stopping the pipe upstream. Construction is desired. Therefore, if a branch pipe is connected in the middle of an existing water pipe using the continuous water construction method and the water flow state is maintained by a bypass formed by the branch pipe, the water pipe can be renewed without water interruption. It can be carried out. Such a continuous water construction method is described in Patent Document 1 below, for example.

  FIG. 15 is a schematic diagram illustrating an example of a procedure for updating an existing water pipe. The arrows in the pipeline represent the flow of water. First, a section A in the pipe is targeted, split T-shaped pipes 81 and 82 are attached to both ends thereof, and a gate valve device (hereinafter referred to as “gate valve”) 83 is connected to each (FIG. 15 ( a)). Next, after connecting a perforation device (not shown) to each gate valve 83 to perforate the pipe portion surrounded by the split T-shaped pipes 81 and 82, the perforation device is removed from the gate valve 83. The branch pipe 84 is connected to form a bypass, the gate valve 83 is opened, and the main gate valve 85 is closed (FIG. 15B). Thereby, the existing water pipe in A section can be updated to new installation pipe line 8A, maintaining the state of uninterrupted water.

  When the update of the water pipe in the A section is completed, the gate valve 85 is opened and water is passed through the main pipe. At this stage, the bypass of section A is not necessary, so the branch pipe 84 is removed (FIG. 15C). Subsequently, for the B section, the branch pipe 86 is connected in the same manner as described above to form a bypass, the gate valve 89 is opened, and the gate valve 85 is closed (FIG. 15 (d)). . At this time, the split T-shaped pipe 87 is attached to a new water pipe in the A section. And the water pipe in B section is updated to the newly installed pipe line 8B, maintaining the state of uninterrupted water, and when it is completed, the branch pipe 86 is removed (FIG. 15 (e)). By repeating this process, existing water pipes can be updated sequentially.

  By the way, in the water pipe renewal construction as described above, the process of removing the branch pipe is complicated, and in particular, when removing the gate valve from the main pipe when removing the branch pipe, the main pipe is continuously watered. The branch port must be sealed with the state maintained, and the operation becomes very complicated. Therefore, conventionally, only the branch pipe is removed and the gate valve is left behind, but there is a concern that the gate valve will be caught by a heavy machine when excavating the same place in the future.

  In order to solve these problems, Patent Documents 2 and 3 below are disclosed as methods for removing the branch pipe together with the gate valve. In this method, an annular core is inserted into a branch port drilled in an existing pipe, the annular core is expanded in diameter and closely locked, and then the annular core is engaged by a screwing action or a fitting action via a retaining ring. A plug is attached to the core. However, in these methods, the plug body cannot be easily detached from the annular core while maintaining the state of uninterrupted water, and when the closed branch port is used again, that is, the branch pipe is connected to the main pipe again. , It is very inconvenient when you want to let the water through after closing the branch plug.

Further, the present inventor, when branching a bypass from a newly installed pipe as shown in FIG. 15 (d), does not install a split T-shaped pipe having a split structure in the newly installed pipe and pierce the branch port. Although a part of the newly installed pipe is configured in advance with an integral T-shaped pipe and the branch pipe is connected to the branch portion of the T-shaped pipe via a gate valve, the following Patent Documents 2 and 3 are described. Since this invention is a method for removing the split T-shaped tube in the first place, it cannot be applied to the case of using an integral T-shaped tube.
JP 2002-154004 A JP 2002-267086 A JP 2005-106083 A

The present invention has been made in view of the above circumstances, and an object of the present invention is to remove a branch pipe that can easily seal the branch port and to easily release the stopper, and to be used in the method. to provide a sealed equipment of the branch port.

The above object can be achieved by the present invention as described below. That is, the branch pipe removing method according to the present invention is the branch pipe removing method in which the branch pipe connected to the cylindrical branch port opened in the direction perpendicular to the axis of the fluid pipe via the gate valve device is the gate valve device. Removing the branch pipe and inserting a plug member capable of sealing the branch port into the gate valve device using an insertion jig; and the plug member into the branch port through the gate valve device. A second step in which the protruding portion provided on the outer periphery of the plug member passes through the missing portion of the engagement protrusion provided on the inner periphery of the branch port, and the plug member is rotated. A third step of aligning the circumferential positions of the overhang portion and the engagement protrusion, and engaging the overhang portion with the engagement protrusion; and a fourth step of removing the gate valve device from the branch port. e Bei a step, and wherein in the second step, against the fluid pressure acting on the plug member The insertion tool is connected to the fluid pipe by a connecting tool, the plug member is pressed from the gate valve device toward the branch port, and the insertion tool is moved by the connecting tool. A reaction force receiving member connectable to the fluid pipe; a first shaft member to which the stopper member is attached at a tip; and a second shaft member to which the reaction force receiving member is attached and rotatably supports the first shaft member. In the third step, the plug member is rotated by rotating the first shaft member .

  According to the branch pipe removal method of the present invention, the plug member is inserted into the gate valve device after the branch pipe is removed, and the plug member is fixed by simply rotating the plug member at a predetermined position. Can do. Further, the branch port can be sealed by the plug member. For this reason, the branch port of the fluid pipe can be easily sealed, and it is not necessary to stop the fluid in the fluid pipe when removing the branch pipe together with the gate valve device. Moreover, in order to release the sealing plug of the branch port, it is only necessary to rotate the plug member to shift the circumferential position of the overhanging portion and the engaging projection, and to pull out the plug member from the branch port. It becomes simple.

  In the present invention, the plug member is inserted into the cylindrical branch port through the gate valve device, and the branch port is sealed by the seal portion of the plug member, and the protruding portion of the plug member and the engagement projection of the branch port are The plug member is fixed by the engaging action. The branch port is opened in a direction perpendicular to the axis of the fluid pipe, and is formed at, for example, a branch portion of a T-shaped tube or a split T-shaped tube.

In the branch pipe removal method of the present invention, in the second step, the insertion jig is connected to the fluid pipe by a connector so as to resist the fluid pressure acting on the plug member, press said plug member toward said branch port from gate valve device. Thereby, the plug member can be prevented from coming off due to the fluid pressure, and the plug member can be appropriately arranged at a predetermined position against the fluid pressure.

The removing method of the branch pipe of the present invention, before Symbol insertion jig, and the reaction force receiving member connectable to the fluid conduit by the coupling, a first shaft member to which the plug member is attached to the tip, the counter And a second shaft member that rotatably supports the first shaft member. In the third step, the plug member is rotated by rotating the first shaft member. It intends line. Thereby, after arrange | positioning a plug member in a predetermined position at a 2nd process, a plug member can be simply rotated, maintaining the state which resisted the fluid pressure.

  In the above, preferably, in the second step, the stopper member is pressed through a jack provided on the connector. According to this method, the plug member can be more easily disposed at a predetermined position against the fluid pressure by pressing the plug member with the jacking force.

  In the above, the fluid pipe side end portion of the gate valve device is formed as a cylindrical insertion port, and by inserting the cylindrical insertion port into the branch port and fastening a fastener, the gate valve device is branched. It is preferably connected to the mouth. As a result, the distance from the fluid pipe to the branch pipe side end of the gate valve can be shortened compared to the case where the gate valve device and the branch port are flange-connected. This is useful when a large surrounding space cannot be secured, such as existing buildings around the site.

  In the above, it is preferable that the fluid pipe is constituted by a T-shaped tube having an integral structure having no divided portion, and the branch port is formed at a branch portion of the T-shaped tube. Thereby, the mounting process of the split T-shaped tube can be omitted. In the case of renewal work of the fluid pipe as described in FIG. 15, the burying period of the branch pipe, which is a temporary pipe, is as short as several months, and when the fluid pipe is newly installed, the branch pipe is connected in the future. It is also possible to use a T-shaped tube in advance. Since the present invention inserts a plug member into a cylindrical branch port and seals it tightly, it is preferable to target a new fluid pipe that is surely free from rust and corrosion.

Further, the branch plug sealing device according to the present invention has a projecting portion that projects from the outer periphery, and is inserted into a cylindrical branch port that opens in a direction perpendicular to the axis of the fluid pipe, and is connected to the branch port. A plug member configured to be sealable, a reaction force receiving member connectable to the fluid pipe by a connector, a first shaft member to which the plug member is attached at a tip, and the reaction force receiving member is attached; A second shaft member that rotatably supports the first shaft member, and an insertion jig configured to rotate the plug member by rotating the first shaft member. is there.

  According to such a sealing device for a branch port, when removing the branch pipe, the plug member can be disposed at a predetermined position in the branch port, and the plug member can be simply rotated while maintaining a state against the fluid pressure. . For this reason, it is possible to easily seal the branch port with respect to the fluid pipe provided with the engagement protrusion on the inner periphery of the branch port, and it is also easy to release the seal plug.

  In the above, the plug member and the first shaft member are connected by fitting, and the second shaft member has a cylindrical shape through which the first shaft member is inserted, and the axial direction with respect to the first shaft member It is preferable that the distal end portion can be engaged with the plug member in a fixed state.

  According to the above configuration, the plug member and the first shaft member are connected by fitting, but the second shaft member is engaged with the plug member in a state where the axial position with respect to the first shaft member is fixed. For this reason, the plug member can be disposed at a predetermined position in the branch port while being securely supported by the insertion jig. In addition, since the first shaft member is inserted through the cylindrical second shaft member attached to the reaction force receiving member connected to the fluid pipe, the plug member can be easily used while maintaining the state against the fluid pressure. Can be rotated. After sealing the branch port, the stopper member can be easily separated from the insertion jig and left in the branch port by releasing the engagement of the second shaft member with the plug member.

In addition , according to the T -shaped tube in which a cylindrical branch port is formed in a branch portion branched in a T -shape, and an engagement projection having a missing portion is provided on the inner periphery of the branch port, the T -tube is provided so as to project to the outer periphery. The branch port can be easily sealed with a plug member that has an overhang portion that is inserted into the branch port and can seal the branch port, and the sealing plug can be easily released. Therefore, when removing the branch pipe, it becomes useful as a fluid pipe to which the branch pipe is connected. This T-shaped tube may be a monolithic T-shaped tube having no divided portion, or may be a divided T-shaped tube having a divided structure having a divided portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example the case of removing a branch pipe connected to a water pipe as a fluid pipe. FIG. 1 is a front sectional view for explaining the branch pipe removing method according to the present invention, and shows a state before the branch pipe is removed. FIG. 2 is a cross-sectional view of the branch port taken along line AA in FIG. FIG. 3 is a plan view showing the water pipe and gate valve device of FIG. 1 and a cross-sectional view along the line BB.

  The water pipe 1 constitutes a part of a pipe line extending in a direction perpendicular to the paper surface in FIG. 1, and in the present embodiment, is constituted by an integral T-shaped pipe having no dividing portion. The inside of the water pipe 1 is in a water passage state, and the branch pipe 3 is removed while maintaining the state of uninterrupted water by the method described below.

  If the water pipe 1 comprised by the T-shaped pipe of the integral structure like this embodiment is itself newly provided, it can be previously used for the location where the branch pipe 3 is connected at the time of the new installation. That is, in the example of FIG. 15, when the water pipe in the A section is updated in (b) with respect to the place where the split T-shaped pipe 87 is attached in (d), the T-shaped pipe having such an integrated structure is used. Can be previously incorporated into the pipeline. In this case, there is no need to attach the split T-shaped pipe to the water pipe as in the normal continuous water construction method, and the process can be omitted.

  The water pipe 1 has a branch portion 1a branched in a T-shape, and a cylindrical branch port 10 opened toward the direction perpendicular to the axis of the water pipe 1 is formed. As shown in FIG. 2, the branch port 10 is provided with engagement protrusions 11 projecting radially inward from the inner peripheral surface thereof, and missing portions are provided at a plurality of locations in the circumferential direction (two locations in the present embodiment). 12 is formed. The circumferential length and number of the missing portions 12 are not particularly limited. Although the missing part 12 should just be formed in at least 1 place, it is preferable that it is formed in several places including 2 places on both sides of the axis center.

  The branch pipe 3 is connected to the branch port 10 via a gate valve device 2 (hereinafter referred to as “gate valve 2”). In the gate valve 2, the branch pipe side end portion on the left side of FIG. 1 is flange-connected to the branch pipe 3, and the fluid pipe side end portion on the opposite side is connected to the branch port 10 of the water pipe 1, A passage that can communicate with each other is formed. The gate valve 2 has a built-in valve body 21 that can be opened and closed so that the passage can be shut off. In FIG. 1, the passage is shut off by the lowered valve body 21.

  The fluid pipe side end of the gate valve 2 is formed as a cylindrical insertion port 22, and the cylindrical insertion port 22 is inserted into the branch port 10. As shown in FIG. 3B, a flange 24 having an insertion hole through which a bolt 23 (an example of a fastener) is inserted is provided on the outer periphery of the gate valve 2, and the outer periphery of the branch portion 1a is Bolt holes 1b arranged coaxially with the insertion holes are formed. Therefore, the gate valve 2 is firmly connected to the branch port 10 by inserting the cylindrical insertion port 22 into the branch port 10 and tightening the bolt 23 inserted through the insertion hole and the bolt hole 1b with a nut.

  According to such a configuration, the distance L from the water pipe 1 to the branch pipe side end of the gate valve 2 can be shortened compared to the case where the gate valve 2 and the branch part 1a are flange-connected. Since the installation area is small, it is useful when a large surrounding space cannot be secured. The branch port 10 is formed with a step portion 13 for receiving the cylindrical insertion port 22. When the gate valve 2 is connected, the inner peripheral surface of the branch port 10 and the inner peripheral surface of the cylindrical insertion port 22 are formed. Are arranged on substantially the same plane.

  When removing the branch pipe 3, first, as shown in FIG. 4, the branch pipe 3 is removed from the gate valve 2, and the plug member 5 is inserted from the branch pipe side end of the gate valve 2 using the insertion jig 4. (Corresponding to the first step). In the present embodiment, a joint flange 6 as a distance adjusting member is connected to the branch pipe side end of the gate valve 2. Thereby, the movement stroke of the plug member 5 at the start of insertion can be secured, and the centering and insertion work of the plug member 5 is simplified.

  Here, the configuration of the sealing device for the branch port will be described. FIG. 5 is a cross-sectional view of the sealing device for a branch port, in which the upper half shows a longitudinal section (see FIG. 4) and the lower half shows a transverse section (see FIG. 7). FIG. 6 is a view of the plug member 5 as viewed from the distal end side. The hermetic plug device includes a disk-shaped plug member 5 that can be fitted into the branch port 10, and an insertion jig 4 for inserting the plug member 5 into the branch port 10.

  The plug member 5 includes a seal portion 51 that can seal the branch port 10, and an overhang portion 52 that projects from the outer periphery. The circumferential length and number of the overhang portions 52 are not particularly limited. A recess having a wall surface 57 is formed between the seal portion 51 and the overhang portion 52. In the seal portion 51, an O-ring 54 is accommodated in an annular dovetail groove 53. Further, although the overhanging portion 52 has an outer diameter larger than the inner diameter of the engaging protrusion 11, the protruding portion 52 is formed so as to be able to pass through the missing portion 12 of the engaging protrusion 11. Is provided.

  The insertion jig 4 includes a reaction force receiving member 40 that is connected to the water pipe 1 by a connector that will be described later, a round bar-shaped inner shaft 42 (corresponding to the first shaft member) to which the plug member 5 is attached at the tip, A cylindrical outer shaft 43 (corresponding to the second shaft member) that rotatably supports the inner shaft 42 is provided. The reaction force receiving member 40 is a cylindrical body having a pair of rings 65 protruding in the horizontal direction, and is attached to engage with the outer shaft 43 in the axial direction at a step formed on the inner peripheral surface thereof. . The reaction force receiving member 40 is externally fitted from the outer shaft 43 to the inner shaft 42, and the inner shaft 42 is inserted and supported by the outer shaft 43. The reaction force receiving member 40 may be integrally attached to the outer cylinder 43.

  The plug member 5 and the inner shaft 42 are connected by fitting, and in this embodiment, the distal end portion 48 having a prismatic shape of the inner shaft 42 is inserted into a recessed portion 55 having a rectangular parallelepiped shape of the plug member 5. Further, the axial position of the outer shaft 43 with respect to the inner shaft 42 is fixed by engaging the tip 49 of the outer shaft 43 with the protrusion 29 of the inner shaft 42 in the axial direction. The distal end portion 49 is configured to be engageable. In the present embodiment, the female screw portion 28 provided at the distal end portion 49 is screwed into the male screw 56 of the plug member 5.

  When the inner shaft 42 is rotated, the outer shaft 43 is rotated together with the plug member 5, but the reaction force receiving member 40 is simply fitted on the inner shaft 42 and the outer shaft 43. Is not transmitted to the reaction force receiving member 40. It is also possible to provide a thrust bearing between the reaction force receiving member 40 and the outer shaft 43 in order to reliably prevent transmission of rotation to the reaction force receiving member 40.

  When the plug member 5 is inserted into the mating flange 6 or the gate valve 2, the valve body 21 of the gate valve 2 is retracted upward to bring the passage into a communicating state. At this time, as shown in FIG. 7, the reaction force receiving member 40 is connected to the water pipe 1 by a lever hoist 34 that is a connector. In this embodiment, the example which indirectly connected the reaction force receiving member 40 to the water pipe 1 in the state where the fitting flange 6 and the gate valve 2 are interposed is shown, and the reaction force receiving member 40 has the fitting flange 6. It is connected to the ring part 61. Since the reaction force receiving member 40 connected to the water pipe 1 receives the reaction force of the water pressure, the plug member 5 does not come out due to the water pressure.

  Next, the plug member 5 is pressed toward the water pipe 1, and the plug member 5 is disposed at a predetermined position in the branch port 10 as shown in FIG. 8 (corresponding to the second step). This predetermined position is a position where the overhanging portion 52 of the plug member 5 has passed through the missing portion 12 of the engaging protrusion 11, and is also a position where the seal portion 51 seals the branch port 10 in this embodiment.

  In the present embodiment, it is only necessary to press the plug member 5 until the wall surface 57 comes into contact with the engagement protrusion 11, and thus the overhang portion 52 can be surely passed through the missing portion 12. Further, by pressing the plug member 5 via the jack 35 provided on the lever hoist 34, the plug member 5 can be easily pressed against water pressure.

  Subsequently, as shown in FIG. 9, the plug member 5 is rotated to align the circumferential positions of the overhanging portion 52 and the engaging protrusion 11, and the overhanging portion 52 and the engaging protrusion 11 are engaged in the axial direction. (Corresponding to the third step). Since the water pipe 1 is in a water-permeable state, the overhanging portion 52 and the engaging protrusion 11 can be firmly engaged by utilizing fluid pressure (that is, water pressure). As a result, the position of the plug member 5 is fixed while the branch port 10 is sealed, and the branch port 10 is in a sealed state.

  The stopper member 5 is rotated by operating a handle (not shown) attached to the rear end portion of the inner shaft 42. According to this sealing device, since the reaction force of the water pressure is received by the reaction force receiving member 40, the state against the water pressure can be appropriately maintained, and the plug member 5 can be easily rotated. Further, since the rotation of the inner shaft 42 is not transmitted to the reaction force receiving member 40, the reaction force receiving member 40 does not rotate when the plug member 5 is rotated, and the posture is maintained.

  In the present embodiment, an example in which the branch port 10 is sealed by the seal portion 51 when the plug member 5 is arranged at a predetermined position in the branch port 10 is shown. It is not limited. Therefore, for example, after the plug member 5 is rotated and the projecting portion 52 and the engaging protrusion 11 are engaged, the sealing material may be compressed by further operation to seal the branch port 10. .

  After sealing the branch port 10, the connection of each member is released as shown in FIG. 10, and the plug member 5 is left in the branch port 10. Specifically, first, the reaction force receiving member 40 is removed from the outer shaft 43, the screwing between the outer shaft 43 and the plug member 5 is released, and then the distal end portion 48 of the inner shaft 42 is inserted into the recessed portion 55 of the plug member 5. Extract from. Next, the inner shaft 42 and the outer shaft 43 are retracted so that their tips are accommodated in the joint flange 6, and the connection between the joint flange 6 and the gate valve 2 is released. Thereafter, the connection between the gate valve 2 and the branch port 10 is released, and the gate valve 2 is removed from the branch port 10 (corresponding to the fourth step). Finally, as shown in FIG. 11, the branch lid 10 is covered with the flange lid 7 to complete the branch pipe removal operation.

  When the branch port 10 tightly plugged is used again for some reason, the above procedure may be reversed. That is, the flange lid 7 is removed, the inner shaft 42 and the outer shaft 43 are attached to the plug member 5, the gate valve 2, the joint flange 6 and the reaction force receiving member 40 are attached, and the plug member 5 is rotated to project. The circumferential positions of the portion 52 and the missing portion 12 are shifted, the plug member 5 is pulled out from the branch port 10, the valve body 21 is lowered, and the passage of the gate valve 2 is blocked. Thus, according to this invention, the operation | work which cancels | releases the airtight stopper of the branch port 10 also becomes very easy.

[Another embodiment]
(1) In the above-described embodiment, the example in which the fluid pipe is configured by the T-shaped pipe having an integral structure without the dividing portion is shown. However, the present invention is not limited to this, and for example, as shown in FIG. Forms are also conceivable. In FIG. 12, a split T-shaped pipe 9 having a split structure is attached to an existing water pipe 19, and the branch pipe 3 is connected to the branch port 90 formed in the branch part 9a via the gate valve 2. Yes. In such a case, the engaging protrusion 91 having a missing portion is provided on the inner periphery of the branch port 90, and sealing with the plug member is performed in the same manner as described above.

  (2) In the above-described embodiment, an example in which the reaction force receiving member is indirectly connected to the fluid pipe has been shown. However, the present invention is not limited to this, for example, using a sealing device 64 as shown in FIG. The reaction force receiving member 41 may be directly connected to the water pipe 1 as shown in FIG. FIG. 13 is a cross-sectional view of the sealing device 64, with the upper half showing a vertical cross section and the lower half showing a horizontal cross section (see FIG. 14).

  The reaction force receiving member 41 includes a cylindrical tubular body 44 that is externally fitted to the outer shaft 43, a pair of engagement bolts 45 that vertically penetrate the tubular body 44, and a pair of horizontally extending from the tubular body 44. Arm 46. The cylindrical body 44 is disposed on the outer periphery of an engagement recess 47 formed on the outer periphery of the outer shaft 43, and a piece attached to the tip of the engagement bolt 45 enters the engagement recess 47 so that the reaction force with the outer shaft 43 is increased. The receiving member 41 is engaged in the axial direction. The reaction force receiving member 41 can be directly connected to the water pipe 1 by a lever hoist 34 spanned from the arm 46 to the water pipe 1.

  (3) In the above-described embodiment, the plug member is provided with the sealing portion, and the example in which the branch port is sealed through the O-ring as the sealing material arranged there is shown, but the present invention is limited to this. Instead, it is also possible to provide a seal at the branch port. For example, an O-ring may be stored in an annular dovetail groove provided on the inner peripheral surface of the branch port, and the outer peripheral surface of the plug member may be in close contact with the O-ring. It is also possible to provide a seal portion on the tip side of the overhang portion.

  (4) The present invention is not limited to renewing water pipes, but can be applied to removing branch pipes for other reasons.

  (5) In the above-described embodiment, the water pipe is taken as an example of the fluid pipe. However, the present invention is not limited to this and is applied to a fluid pipe used for various liquids / gases other than water. it can.

Front view sectional drawing for demonstrating the removal method of the branch pipe which concerns on this invention Sectional drawing of the branch port along the AA arrow of FIG. The top view which shows the water pipe and gate valve apparatus of FIG. 1, and sectional drawing along the BB arrow The front view for demonstrating the removal method of the branch pipe which concerns on this invention Sectional drawing which shows the capping device of the branch port which concerns on this invention View of plug member viewed from the tip side Plan view sectional drawing for demonstrating the removal method of the branch pipe which concerns on this invention Plan view sectional drawing for demonstrating the removal method of the branch pipe which concerns on this invention The figure explaining rotation of a stopper member Plan view sectional drawing for demonstrating the removal method of the branch pipe which concerns on this invention Plan view sectional drawing for demonstrating the removal method of the branch pipe which concerns on this invention Front view sectional drawing for demonstrating the removal method of the branch pipe which concerns on another embodiment of this invention Sectional drawing which shows the sealing stopper apparatus which concerns on another embodiment of this invention. Plan view sectional drawing for demonstrating the removal method of the branch pipe which concerns on another embodiment of this invention Schematic showing an example of the procedure for updating an existing water pipe

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pipe 1a Branch part 2 Gate valve apparatus 3 Branch pipe 4 Inserting jig 5 Plug member 6 Joint flange 10 Branching port 11 Engaging protrusion 12 Missing part 21 Valve body 22 Cylindrical insertion port 23 Bolt (fastener)
34 Lever hoist (connector)
35 Jack 40 Reaction force receiving member 42 Inner shaft 43 Outer shaft 51 Seal portion 52 Overhang portion

Claims (6)

In the removal method of the branch pipe connected to the cylindrical branch port opened toward the direction perpendicular to the axis of the fluid pipe via the gate valve device,
A first step of removing the branch pipe from the gate valve device and inserting a plug member capable of sealing the branch port into the gate valve device using an insertion jig;
The plug member is disposed in the branch port through the gate valve device, and the overhanging portion provided on the outer periphery of the plug member passes through the missing portion of the engagement protrusion provided on the inner periphery of the branch port. A second step;
A third step of rotating the plug member to align circumferential positions of the overhanging portion and the engaging protrusion, and engaging the overhanging portion with the engaging protrusion;
E Bei and a fourth step of removing the gate valve device from the branch port,
In the second step, the insertion jig is connected to the fluid pipe by a connector so as to resist the fluid pressure acting on the plug member, and from the gate valve device toward the branch port. Pressing the plug member,
The insertion jig includes a reaction force receiving member connectable to the fluid pipe by the connector, a first shaft member to which the plug member is attached at a tip, the reaction force receiving member is attached, and the first shaft A second shaft member that rotatably supports the member;
In the third step, the branch pipe is removed by rotating the plug member by rotating the first shaft member . The removal method of the branch pipe of Claim 1 which performs the press of the said plug member through the jack provided in the said connection tool in the said 2nd process. The fluid pipe side end of the gate valve device is formed as a cylindrical insertion port, and the gate valve device is connected to the branch port by inserting the cylindrical insertion port into the branch port and fastening a fastener. The method for removing a branch pipe according to claim 1 or 2 . The branch according to any one of claims 1 to 3, wherein the fluid pipe is configured by an integral T-shaped tube having no divided portion, and the branch port is formed at a branch portion of the T-shaped tube. How to remove the tube. A plug member that has an overhang provided on the outer periphery and is inserted into a cylindrical branch opening opened in a direction perpendicular to the axis of the fluid pipe so that the branch opening can be sealed;
A reaction force receiving member connectable to the fluid pipe by a connector; a first shaft member to which the plug member is attached at a tip; and the reaction force receiving member is attached and rotatably supports the first shaft member. An opening sealing device having a second shaft member, and an insertion jig configured to rotate the plug member by rotating the first shaft member . The plug member and the first shaft member are connected by fitting, and the second shaft member has a cylindrical shape through which the first shaft member is inserted, and the axial position with respect to the first shaft member is fixed. 6. The branch plug sealing device according to claim 5 , wherein a tip end portion of the plug member can be engaged with the plug member in a closed state.

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