JP2007255592A - Removal method of branch pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform supplementary construction such as a pit excavation at a low cost upon removing a branch pipe joint of buried piping in an active pipe state of the branch pipe joint. <P>SOLUTION: A first cylindrical tool is air-tightly connected to the branch pipe joint A in a pit 4 from a ground side to air-tightly surround a plug. By remote control from the ground side, the plug is detached, and an elastic member 12 inserted in a buried pipe B through the first cylindrical tool and the branch pipe joint A is increased in diameter and deformed, and a branch hole 1 is temporarily sealed from the inside of the buried pipe. By remote control from the ground side, a branch pipe C is cut off from the branch pipe joint A and the branch pipe joint A is detached and withdrawn. By remote control from the ground side, a cylindrical receiver is air-tightly screwed into the branch hole and fixed, and a second cylindrical tool is air-tightly connected to the cylindrical receiver from the ground side. By remote control from the ground side, the elastic member 12 is decreased in diameter and deformed, and withdrawn in the second cylindrical tool through an opening of the cylindrical receiver, and the opening of the cylindrical receiver is sealed with a plug member inside the second cylindrical tool. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the lower end portion of the branch pipe joint is screwed and connected to the peripheral surface of the branch hole formed in the pipe wall of the buried pipe, and the plug is screwed into the upper end portion of the branch pipe joint in a sealed state. In a buried pipe in which a branch pipe is connected to a branch portion of the branch pipe joint, a pit is excavated to expose the branch pipe joint, and the branch pipe joint is in an active pipe state from the peripheral surface of the branch hole. It is related with the removal method of the branch pipe joint which removes and removes and seals the said branch hole.

  In the above branch pipe joint removal method, conventionally, for example, a branch pipe joint that has been exposed by excavating a pit in order to remove a branch pipe joint that is no longer needed from a buried pipe such as a main pipe for gas supply in an active pipe state. To prevent gas from leaking to the outside even if it is removed from this branch pipe, the branch pipe joint, together with the plug member, tools, etc., is hermetically surrounded by a no-bro bag and is inserted into the no-bro bag. The operator removes the branch pipe joint from the peripheral surface of the branch hole and fixes the cylindrical receiver to the peripheral surface of the branch hole by the hand of the operator, and seals the opening of the cylindrical receiver with a plug member. (It is a well-known and commonly used technique and cannot disclose prior art document information).

For this reason, it is necessary to carry out the removal work by entering the pit so that the operator can insert his hand into the no-bro bag, and as a result, the operator's work space can be secured. It is necessary to excavate a large pit, backfill the large pit, and take sufficient safety measures to ensure the safety of workers in the pit. When removing it, there is a drawback that the construction cost of incidental work such as pit excavation becomes high.
The present invention has been made in view of the above circumstances, and an object of the present invention is to enable ancillary work such as pit excavation at a low construction cost when removing a branch pipe joint in an active pipe state in a buried pipe. To do.

In the first characteristic configuration of the present invention, the lower end portion of the branch pipe joint is screwed to the peripheral surface of the branch hole formed in the pipe wall of the buried pipe, and the plug is connected to the upper end portion of the branch pipe joint. In an embedded pipe that is screwed in a sealed state and has a branch pipe connected to a branch portion of the branch pipe joint, a pit is excavated to expose the branch pipe joint, and the branch pipe joint is connected to the peripheral surface of the branch hole. It is a removal method of the branch pipe joint that removes and removes the branch pipe from the live pipe state, and seals the branch hole,
By operating from the ground side, a first cylindrical jig is airtightly connected to the upper end portion of the branch pipe joint in the pit, and the plug is hermetically surrounded by the first cylindrical jig. Tool connection process;
The plug is removed from the first cylindrical jig by remote control from the ground side, and the elastic member inserted into the buried pipe through the first cylindrical jig and the branch pipe joint is expanded and deformed. A temporary sealing step of temporarily sealing the branch hole from the inside of the buried pipe;
With the branch hole temporarily sealed, the branch pipe is disconnected from the branch pipe joint by remote control from the ground side, and the branch pipe joint is removed from the peripheral surface of the branch hole and recovered to the ground side. Branch pipe joint collection process
A receiver fixing step of screwing and fixing a cylindrical holder for attaching a plug member to the peripheral surface of the branch hole by remote operation from the ground side,
By operating from the ground side, the second cylindrical jig is connected to the cylindrical receiver in an airtight manner, and the second cylindrical jig hermetically surrounds the opening of the cylindrical receiver with the second cylindrical jig. Jig connection process;
The elastic member is reduced in diameter by remote operation from the ground side, and is collected into the second cylindrical jig through the opening of the cylindrical receiver, and inside the second cylindrical jig. And a branch hole sealing step for sealing the opening of the cylindrical receiver with a plug member.

[Action and effect]
In the first cylindrical jig connecting step, the first cylindrical jig is hermetically connected to the upper end portion of the branch pipe joint in the pit by an operation from the ground side, and the plug is connected with the first cylindrical jig. Airtightly encloses the plug so that the operator does not enter the pit and the internal fluid such as gas does not leak outside even if the plug screwed to the upper end of the branch fitting is removed. Can be enclosed.
In the temporary sealing step, the plug is removed from the first cylindrical jig by remote operation from the ground side, and the elastic member inserted into the buried pipe through the first cylindrical jig and the branch pipe joint is expanded and deformed. Since the branch hole is temporarily sealed from the inside of the buried pipe, the operator can remove the branch pipe joint screwed to the peripheral surface of the branch hole from the branch hole of the buried pipe without entering the pit. The branch hole can be temporarily sealed so that the internal fluid does not leak to the outside from the branch hole, and the branch fitting is removed from the peripheral surface of the branch hole, and the cylindrical holder is fixed by screwing the peripheral surface of the branch hole. The branch hole can be temporarily sealed so that it can be made.
In the branch pipe joint collection process, the branch pipe is disconnected from the branch pipe joint by remote control from the ground side with the branch hole temporarily sealed, and the branch pipe joint is removed from the peripheral surface of the branch hole to the ground side. Therefore, the branch pipe joint can be recovered on the ground side so that the internal fluid does not leak outside from the branch hole without the operator entering the pit.
In the receiver fixing process, the cylindrical holder for mounting the plug member is screwed and fixed to the peripheral surface of the branch hole by remote control from the ground side, so that the operator can enter the cylindrical receiver without entering the pit. The tool can be screwed and fixed to the peripheral surface of the branch hole in an airtight manner.
In the second cylindrical jig connecting step, the second cylindrical jig is hermetically connected to the cylindrical holder by an operation from the ground side, and the opening of the cylindrical receiver is connected with the second cylindrical jig. Even if the elastic member for temporary sealing of the branch hole inserted into the buried pipe is reduced in diameter and taken out from the opening of the cylindrical holder without the operator entering the pit, the opening So that the internal fluid does not leak to the outside, the second cylindrical jig can air-tightly surround the opening of the cylindrical receiver.
In the branch hole sealing step, the elastic member is reduced in diameter by remote operation from the ground side, and is collected into the second cylindrical jig through the opening of the cylindrical holder, and the second cylindrical jig. Since the opening of the cylindrical receiver is sealed with a plug member on the inside, even if the operator removes the second cylindrical jig from the cylindrical receiver without entering the pit, the cylindrical receiver The opening can be sealed with a plug member so that the internal fluid does not leak out from the opening.
Therefore, the operator can carry out the removal work without entering the pit, so there is no need to excavate a large pit as in the past or to refill the large pit, and safety measures are also compared to the conventional one. It can be simplified, and when removing the branch pipe joint in the live pipe state in the buried pipe, ancillary work such as pit excavation can be carried out at a low construction cost.

According to a second characteristic configuration of the present invention, the first cylindrical jig includes a first lid body having a connection portion with respect to an upper end portion of the branch pipe joint on one end side and capable of opening and closing the other end side. A first partition member capable of opening and closing an intermediate position between the connection portion and the first lid,
In the temporary sealing step,
Using a first rotation operation tool comprising a first fitting member capable of fitting and holding the plug in a non-rotating state, and a first operation member capable of rotating the first fitting member.
With the intermediate position closed, the first operating member is hermetically inserted into a through-hole formed in the first lid, and the first fitting member is inserted into the first cylindrical jig. After being mounted on the inside, the intermediate position is opened, and the first fitting member is fitted to the plug and rotated by remote operation from the ground side by the first operating member, and the plug is branched. After removing the plug from the pipe joint, holding the removed plug on the first fitting member, and moving the intermediate position beyond the intermediate position by remote operation from the ground side by the first operating member, the intermediate position is Close, open the other end of the first cylindrical jig, and collect the plug on the ground side; and
Using a sealing jig provided with the elastic member and an operation mechanism for expanding and deforming the elastic member, and a deformation operating member capable of remotely operating the sealing jig,
With the intermediate position closed, the deformation operation member detachably connected to the sealing jig is hermetically inserted into a through hole formed in the first lid, and the sealing jig Is attached to the inside of the first cylindrical jig, then the intermediate position is opened, and the sealing jig is inserted into the buried pipe by remote operation from the ground side by the deformation operation member. A tool insertion process,
The elastic member is expanded and deformed inside the buried pipe by remote operation of the operation mechanism from the ground side by the deforming operation member, and the branch hole is temporarily sealed from the inside of the buried pipe.

[Action and effect]
The 1st cylindrical jig is provided with the connection part with respect to the upper end part of a branch pipe joint in one end side, and the intermediate | middle of a connection part and a 1st cover body which can freely open and close the other end side Since the first partition member whose position can be freely opened and closed is provided, the first cylinder connected to the upper end of the branch pipe joint by providing a plug recovery step and a sealing jig insertion step in the temporary sealing step The plug is removed by remote control from the ground side through the jig, and the removed plug is recovered by remote control from the ground side, or an elastic member for temporarily closing the branch hole is embedded by remote control from the ground side When entering the inside of the pipe, it is easy to carry out the operation in a state in which the internal fluid hardly leaks to the outside.
That is, in the plug collecting step, a first rotary operation tool including a first fitting member that can be fitted and held in a non-rotating state of the plug, and a first operation member that can freely rotate the first fitting member. The first operating member is formed in the first lid with the intermediate position closed so that the internal fluid does not leak even if the other end side of the first cylindrical jig is opened. After the first fitting member is inserted inside the hole and attached to the inside of the first cylindrical jig, the intermediate position is opened, and the first fitting is performed by remote operation from the ground side by the first operating member. The member is fitted to the plug and rotated, the plug is detached from the branch pipe joint, the removed plug is held by the first fitting member, and the remote operation from the ground side by the first operation member is performed. After moving beyond the intermediate position, the internal fluid leaks even if the other end of the first cylindrical jig is opened. The middle position is closed, the other end of the first cylindrical jig is opened and recovered to the ground side, so the plug can be removed from the branch fitting efficiently by a series of operations using the first rotary operation tool. In addition, the internal fluid can hardly be leaked to the outside when the plug is removed from the branch fitting and when the removed plug is recovered to the ground side.
Further, in the sealing jig insertion step, using a sealing jig provided with an elastic member and an operation mechanism for expanding and deforming the elastic member, and a deformation operation member capable of remotely operating the sealing jig,
A deforming operation member detachably connected to the sealing jig in a state where the intermediate position is closed so that the internal fluid does not leak even if the other end side of the first cylindrical jig is opened. After the airtightly inserted through the through-hole formed in, and mounting the sealing jig inside the first cylindrical jig, the intermediate position is opened, and it is sealed by remote operation from the ground side by the deformation operation member Since the jig is allowed to enter the inside of the buried pipe, the internal fluid is difficult to leak to the outside when the elastic member is made to enter the inside of the buried pipe.
Then, the elastic member is expanded and deformed inside the buried pipe by remote operation to the operation mechanism from the ground side by the deforming operation member, and the branch hole is temporarily sealed from the inside of the buried pipe. Thus, the branch hole can be temporarily sealed by efficiently inserting the elastic member into the inside of the buried pipe.

  According to a third characteristic configuration of the present invention, the first tubular treatment is performed by an operation from the ground side in a state where the branch hole is temporarily sealed between the temporary sealing step and the branch pipe joint collecting step. There is a first cylindrical jig collecting step for removing the tool from the branch pipe joint and collecting it on the ground side.

[Action and effect]
With the branch hole temporarily sealed between the temporary sealing step and the branch pipe joint recovery step, the first cylindrical jig is removed from the branch pipe joint and recovered to the ground side by an operation from the ground side. Since the first cylindrical jig recovery process is provided, in the branch pipe joint recovery process, the branch pipe is separated from the branch pipe joint in the wide pit from which the first cylindrical jig has been removed. The pipe joint can be removed from the peripheral surface of the branch hole.

  A fourth characteristic configuration of the present invention includes a first gripping member capable of gripping the branch pipe joint and a second operation member capable of rotating the first gripping member in the branch pipe joint collecting step. Using a two-rotating operation tool, the branch pipe joint is gripped by the first gripping member and rotated by remote control from the ground side by the second control member while the branch hole is temporarily sealed. The branch pipe joint is removed from the branch hole and recovered to the ground side.

[Action and effect]
In the branch pipe joint collecting step, a branch hole is formed by using a second rotary operation tool including a first grip member that can grip the branch pipe joint and a second operation member that can rotate the first grip member. Is temporarily sealed, the branch pipe joint is gripped by the first gripping member and rotated by remote operation from the ground side by the second operating member, and the branch pipe joint is removed from the branch hole, and the ground side Therefore, the branch pipe joint can be removed from the branch pipe joint and recovered to the ground side efficiently by a series of operations using the second rotary operation tool.

  According to a fifth characteristic configuration of the present invention, in the receiver fixing step, a second gripping member capable of gripping the cylindrical receiver and a third operation member capable of rotating the second gripping member are provided. Using the three-rotation operation tool, the tubular receiving tool gripped by the second gripping member is remotely controlled from the ground side by the third operation member in the state where the branch hole is temporarily sealed. It is in a point to be screwed and fixed to the branch hole in an airtight manner.

[Action and effect]
The branch hole is temporarily sealed by using a third rotating operation tool including a second holding member capable of holding the cylindrical receiver and a third operating member capable of rotating the second holding member. In the state, since the cylindrical receiver gripped by the second gripping member is airtightly screwed and fixed to the branch hole by remote control from the ground side by the third operating member, in a series of operations by the third rotary operating tool, The cylindrical receptacle can be screwed and fixed to the branch hole with high efficiency.

According to a sixth characteristic configuration of the present invention, the second cylindrical jig includes a connection portion for the cylindrical receiver on one end side, and a second lid body that can be opened and closed on the other end side; A second partition member capable of opening and closing an intermediate position between the connecting portion and the second lid,
In the temporary sealing step,
Using a sealing jig provided with the elastic member and an operation mechanism for expanding and deforming the elastic member, and a deformation operation member capable of remotely operating the sealing jig, the deformation operation member from the ground side The elastic member is expanded and deformed inside the buried pipe by remote operation with respect to the operation mechanism, and the branch hole is temporarily sealed from the inside of the buried pipe,
In the second cylindrical jig connecting step,
In a state where the intermediate position is opened, the second cylindrical jig is connected to the cylindrical holder so that the deformation operation member enters the inside of the second cylindrical jig, and the second Airtightly inserted through the through-hole formed in the lid,
In the branch hole sealing step,
The elastic member is returned and deformed to a reduced diameter state by remote operation of the operation mechanism from the ground side by the deformation operation member, and the sealing jig is operated by remote operation from the ground side by the deformation operation member, After entering the inside of the second cylindrical jig through the opening of the cylindrical receptacle and moving it to a position beyond the intermediate position, the intermediate position is closed, and the second cylindrical jig Open the end side, collect the sealing jig to the ground side,
Using a fourth rotation operation tool comprising a second fitting member capable of fitting and holding the stopper member in a non-rotating state, and a fourth operation member capable of rotating the second fitting member.
In the state where the intermediate position is closed, the fourth operating member is hermetically inserted into a through-hole formed in the second lid body, and the plug member is fitted and held. After mounting the member inside the second cylindrical jig, the intermediate position is opened, and the second fitting member is moved to the cylindrical receiver side by remote operation from the ground side by the fourth operating member. The plug member is screwed into the opening of the tubular receiving member by rotating the second fitting member and entering the stopper.

[Action and effect]
The second cylindrical jig is provided with a connecting portion for connecting to the cylindrical receiving member at one end side, and an intermediate position between the second lid body that can be opened and closed at the other end side and the connecting portion and the second lid body. Since the second partition member that can be opened and closed is provided, the internal fluid is unlikely to leak to the outside in the branch hole sealing step.
That is, in the temporary sealing process, a sealing jig provided with an elastic member for temporarily closing the branch hole and an operation mechanism for expanding and deforming the elastic member and a deforming operation member capable of remotely operating the sealing jig are used. Then, the elastic member is expanded and deformed inside the buried pipe by remote operation with respect to the operation mechanism from the ground side by the deforming operation member, and the branch hole is temporarily sealed from the inside of the buried pipe, and the second cylindrical jig In the connecting step, with the intermediate position opened, the second cylindrical jig is connected to the cylindrical holder so that the deformation operation member enters the second cylindrical jig, and the second lid In the branch hole sealing step, the elastic member is returned to the reduced diameter state by the remote operation to the operation mechanism from the ground side by the deformation operation member, and the deformation operation member is used. Sealing treatment by remote control from the ground side Is moved into the second cylindrical jig through the opening of the cylindrical holder and moved to a position beyond the intermediate position, and the other end of the second cylindrical jig is opened. The intermediate position is closed so as not to leak, and the other end of the second cylindrical jig is opened, and the sealing jig is recovered to the ground side. Therefore, when the elastic member is recovered to the ground side, the internal fluid Is difficult to leak out.
Further, in the branch hole sealing step, a fourth rotation operation including a second fitting member capable of fitting and holding the stopper member in a non-rotating state, and a fourth operation member capable of rotating the second fitting member. A fourth operating member is formed on the second lid body with the intermediate position closed so that the internal fluid does not leak even if the other end side of the second cylindrical jig is opened using a tool. After the second fitting member that is fitted and held in the through hole is fitted inside the second cylindrical jig, the intermediate position is opened and the fourth operating member is used. The second fitting member is inserted into the cylindrical receiver side by remote operation from the ground side, and the second fitting member is rotated to screw the plug member into the opening of the cylindrical receiver, so that the fourth rotation Through a series of operations using the operation tool, the plug member can be efficiently screwed into the opening of the cylindrical receiver, and the plug member can be attached to the cylindrical receiver. Even when screwed into the mouth, hardly internal fluid leak out to the outside.

Embodiments of the present invention will be described below with reference to the drawings.
1-19, the lower end part of the steel branch pipe joint A is screwed and connected to the peripheral surface of the branch hole 1 formed in the pipe wall of the steel-made steel branch pipe (an example of the buried pipe) B for gas supply. In addition, a steel plug 2 is screwed in a sealed state at the upper end of the branch pipe joint A, and a steel branch pipe C for gas supply is connected to the branch part 3 of the branch pipe joint A. The removal method of the branch pipe joint by this invention which removes and removes the branch pipe joint A from the surrounding surface of the branch hole 1 in an active pipe state, and seals the branch hole 1 in the buried gas pipe for use.

  The branch pipe joint removing method includes the pit excavation step shown in FIG. 1, the first cylindrical jig connecting step shown in FIG. 2, the temporary sealing step shown in FIGS. 3 to 9, and the first shown in FIG. A cylindrical jig recovery process, a branch pipe joint recovery process shown in FIGS. 11 and 12, a receiver fixing process shown in FIG. 13, a branch pipe joint recovery process shown in FIGS. 14 and 15, and FIGS. The branch hole sealing step shown and the backfilling step shown in FIG. 20 are provided in the order of description.

  In the pit excavation step, as shown in FIG. 1, the pit 4 is excavated to expose the branch pipe joint A on the ground side.

  In the first cylindrical jig connecting step, as shown in FIG. 2, the first cylindrical jig 5 is hermetically connected to the upper end portion of the branch pipe joint A in the pit 4 by an operation from the ground side. The plug 2 is hermetically surrounded by the first cylindrical jig 5.

  As shown in FIG. 21, the first cylindrical jig 5 is configured by connecting a pair of cylindrical members 6 a and 6 b via a ball valve 8 that can be opened and closed by a swinging operation of a lever 7. The connecting portion 9 for the upper end portion of the branch pipe joint A is provided on one end side, and an intermediate position between the first lid body 10 that can be opened and closed on the other end side, and the connecting portion 9 and the first lid body 10. And a first partition member 11 that can be opened and closed.

  The connecting portion 9 is configured such that the upper end portion of the branch pipe joint A is provided with a clamp portion for holding and holding the seal member so as to be able to release the grip, and the first lid body 10 is an end of the cylindrical member 6b. The first partition member 11 is constituted by the valve body of the ball valve 8 and is opened and closed by swinging the lever 7 to open and close the connection portion 9 and the first lid. An intermediate position with respect to the body 10 can be freely opened and closed.

  In the temporary sealing step, the plug collecting step shown in FIGS. 3 to 6 and the sealing jig insertion step shown in FIGS. 7 and 8 are provided, and the first cylindrical jig 5 can be remotely operated from the ground side. The plug 2 is removed inside, and the elastic member 12 inserted into the main branch B through the first cylindrical jig 5 and the branch pipe joint A is expanded and deformed to temporarily connect the branch hole 1 from the inside of the main branch B. Seal.

  In the plug collecting step, as shown in FIG. 21, a first fitting member 13 capable of fitting and holding the plug 2 in a non-rotating state, and a first operating member 14 capable of rotating the first fitting member 13 freely. The first rotation operation tool 15 provided with the above is used, and the first fitting member 13 is provided with a camera 16 capable of photographing the front side in the fitting direction and a magnet 17 capable of attracting and holding the plug 2. .

  As shown in FIGS. 3 and 21, the first operating member 14 is hermetically inserted through the through hole 18 formed in the first lid body 10, and the first fitting member 13 is moved to the first cylindrical member. After mounting on the inside of the tool 5, the ball valve 8 is opened, and the first operation member 14 inserted into the cylindrical member 6 a side is remotely operated from the ground side as shown in FIG. The fitting member 13 is fitted to the plug 2 and rotated to remove the plug 2 from the branch pipe joint A, and the removed plug 2 is attracted and held by the magnet 17, as shown in FIG. After the ball valve 8 is moved by remote operation from the ground side by the operation member 14, the ball valve 8 is closed, and the first lid 10 is removed as shown in FIG. The other end side of the tool 5 is opened, and the plug 2 is collected on the ground side.

  In the sealing jig insertion step, for example, as described in Japanese Patent Application Laid-Open No. 2004-245276, a sealing jig 20 including an elastic member 12 and an operation mechanism 19 for expanding and deforming the elastic member 12 is provided. A deformation operation member 21 capable of remotely operating the sealing jig 20 and the ball valve 8 being closed, the deformation is detachably connected to the sealing jig 20 as shown in FIG. The operation member 21 is inserted air-tightly into the through-hole 18 formed in the first lid body 10, the sealing jig 20 is mounted inside the first cylindrical jig 5, and then the ball valve 8 is opened. As shown in FIG. 8, the sealing jig 20 enters the inside of the main branch B by remote operation from the ground side by the deformation operation member 21.

  Then, as shown in FIG. 9, the elastic member 12 is compressed on the inside of the main branch B by the remote operation of the operation mechanism 19 from the ground side by the deformation operation member 21, and the diameter of the branch member 1 is expanded. Temporarily seal from the inside of B.

  Next, in a state where the branch hole 1 is temporarily sealed, the first cylindrical jig 5 is removed from the branch pipe joint A by the operation from the ground side as shown in FIG. It removes from the sealing jig | tool 20 and collect | recovers the 1st cylindrical jig | tool 5 to the ground side with the deformation | transformation operation member 21 (1st cylindrical jig | tool collection process).

  In the branch pipe joint collection step, the branch pipe C is separated from the branch pipe joint A near the branch portion 3 as shown in FIG. 11 by remote control from the ground side while the branch hole 1 is temporarily sealed. In addition, as shown in FIG. 12, a second rotary operation tool 24 including a first grip member 22 capable of gripping the branch pipe joint A and a second operation member 23 capable of rotating the first grip member 22. In a state where the branch hole 1 is temporarily sealed, the branch pipe joint A is gripped by the first gripping member 22 and rotated by remote control from the ground side by the second operating member 23, The branch pipe joint A is removed from the peripheral surface of the branch hole 1 and recovered to the ground side.

  In the receiving fixture fixing step, as shown in FIG. 13, a second holding member 26 capable of holding the tubular receiving member 25 for attaching the plug member, and a third operating member capable of rotating the second holding member 26 are provided. 27, and the second gripping member 26 is gripped by remote control from the ground side by the third operating member 27 in a state where the branch hole 1 is temporarily sealed. A cylindrical receiving tool 25 is screwed and fixed to the peripheral surface of the branch hole 1 in an airtight manner.

  In the second cylindrical jig connecting step, as shown in FIG. 14, similarly to the first cylindrical jig 5, a connecting portion 29 for the cylindrical holder 25 is provided on one end side, and the other end side. By opening / closing the ball valve 32 with the lever 31 and the second lid body 30 that can be opened and closed freely, a second partition member (valve body) that can be opened and closed at an intermediate position between the connecting portion 29 and the second lid body 30. The second cylindrical jig 33 provided with the above is airtightly connected to the cylindrical receiver 25 with the ball valve 32 opened by an operation from the ground side, and a deformation operation is performed as shown in FIG. The member 21 is hermetically inserted into a through-hole 34 formed in the second lid 30 to enter the inside of the second cylindrical jig 33, and the cylindrical holder 25 is inserted by the second cylindrical jig 33. The opening 35 is hermetically enclosed.

  In the branch hole sealing step, as shown in FIGS. 16 to 19, the elastic member 12 in the main branch B is deformed and reduced in diameter by a remote operation from the ground side, and is passed through the opening 35 of the cylindrical receiver 25. In the second cylindrical jig 33, the opening 35 of the cylindrical holder 25 is sealed with a plug member 36 inside the second cylindrical jig 33.

  That is, as shown in FIG. 16, the deformation operation member 21 entering the inside of the second cylindrical jig 33 is connected to the sealing jig 20, and the operation mechanism 19 from the ground side by the deformation operation member 21 is connected. The elastic member 12 is returned and deformed to a reduced diameter state by remote operation, and the sealing jig 20 is inserted into the second cylindrical jig 33 through the opening 35 of the cylindrical holder 25 to thereby provide a ball valve. After moving to a position exceeding 32, the ball valve 32 is closed and the second lid 30 is removed to open the other end side of the second cylindrical jig 33 as shown in FIG. Collect 20 on the ground side.

  Next, as shown in FIG. 18, a second fitting member 37 capable of fitting and holding the stopper member 36 in a non-rotating state, and a fourth operation member 38 capable of rotating the second fitting member 37 are provided. Using the provided fourth rotary operation tool 39, with the ball valve 32 closed, the fourth operation member 38 is hermetically inserted into the through-hole 34 formed in the second lid 30, and the plug After the second fitting member 37 fitting and holding the member 36 is mounted inside the second cylindrical jig 33, the ball valve 32 is opened and, as shown in FIG. The second fitting member 37 is inserted into the cylindrical receiver 25 side by remote operation from the ground side, and the second fitting member 37 is rotated so that the plug member 36 is opened to the opening 35 of the cylindrical receiver 25. Screw in tightly.

  In the backfilling step, as shown in FIG. 20, the inside of the pit 4 is backfilled with earth and sand 40 or the like with the branch pipe C pulled out from the ground side and removed.

[Other Embodiments]
1. The branch pipe joint removing method according to the present invention may use a first cylindrical jig provided with a shutter member as a first partition member.
2. The branch pipe joint removing method according to the present invention may use a second cylindrical jig provided with a shutter member as a second partition member.
3. The method for removing a branch pipe joint according to the present invention may be used for removing a branch pipe joint connected to a buried pipe for water and sewage.

Illustration of pit excavation process Explanatory drawing of the 1st cylindrical jig connection process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of temporary sealing process Explanatory drawing of the 1st cylindrical jig recovery process Illustration of branch pipe joint collection process Illustration of branch pipe joint collection process Illustration of receiving fixture fixing process Explanatory drawing of the 2nd cylindrical jig connection process Explanatory drawing of the 2nd cylindrical jig connection process Illustration of branch hole sealing process Illustration of branch hole sealing process Illustration of branch hole sealing process Illustration of branch hole sealing process Explanatory drawing of backfill process Longitudinal cross-sectional view of the main part of the first cylindrical jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Branch hole 2 Plug 3 Branch part 4 Pit 5 1st cylindrical jig 9 Connection part 10 1st cover body 11 1st partition member 12 Elastic member 13 1st fitting member 14 1st operation member 15 1st rotation operation tool 18 Through-hole 19 Operation mechanism 20 Sealing jig 21 Deformation operation member 22 First grip member 23 Second operation member 24 Second rotation operation tool 25 Cylindrical holder 26 Second grip member 27 Third operation member 28 Third rotation operation Tool 29 Connection part 30 2nd cover body 33 2nd cylindrical jig 34 Through-hole 35 Opening part 36 Plug member 37 2nd fitting member 38 4th operation member 39 4th rotation operation tool A Branch pipe joint B Embedded pipe ( This branch)
C branch pipe

Claims (6)

The lower end of the branch pipe joint is screwed and connected to the peripheral surface of the branch hole formed in the pipe wall of the buried pipe, and a plug is screwed into the upper end of the branch pipe joint in a sealed state, In a buried pipe in which a branch pipe is connected to a branch portion of the pipe joint, a pit is excavated to expose the branch pipe joint, and the branch pipe joint is removed from the peripheral surface of the branch hole in a live pipe state and removed. A branch pipe joint removing method for sealing the branch hole,
By operating from the ground side, a first cylindrical jig is airtightly connected to the upper end portion of the branch pipe joint in the pit, and the plug is hermetically surrounded by the first cylindrical jig. Tool connection process;
The plug is removed from the first cylindrical jig by remote control from the ground side, and the elastic member inserted into the buried pipe through the first cylindrical jig and the branch pipe joint is expanded and deformed. A temporary sealing step of temporarily sealing the branch hole from the inside of the buried pipe;
With the branch hole temporarily sealed, the branch pipe is disconnected from the branch pipe joint by remote control from the ground side, and the branch pipe joint is removed from the peripheral surface of the branch hole and recovered to the ground side. Branch pipe joint collection process
A receiver fixing step of screwing and fixing a cylindrical holder for attaching a plug member to the peripheral surface of the branch hole by remote operation from the ground side,
By operating from the ground side, the second cylindrical jig is connected to the cylindrical receiver in an airtight manner, and the second cylindrical jig hermetically surrounds the opening of the cylindrical receiver with the second cylindrical jig. Jig connection process;
The elastic member is reduced in diameter by remote operation from the ground side, and is collected into the second cylindrical jig through the opening of the cylindrical receiver, and inside the second cylindrical jig. The branch pipe joint removing method is provided with a branch hole sealing step for sealing the opening of the cylindrical receiver with a plug member. The first cylindrical jig includes a first lid body having a connection portion with respect to an upper end portion of the branch pipe joint on one end side, and the other end side being freely openable / closable, and the connection portion and the first lid. A first partition member that can be opened and closed at an intermediate position with the body,
In the temporary sealing step,
Using a first rotation operation tool comprising a first fitting member capable of fitting and holding the plug in a non-rotating state, and a first operation member capable of rotating the first fitting member.
With the intermediate position closed, the first operating member is hermetically inserted into a through-hole formed in the first lid, and the first fitting member is inserted into the first cylindrical jig. After being mounted on the inside, the intermediate position is opened, and the first fitting member is fitted to the plug and rotated by remote operation from the ground side by the first operating member, and the plug is branched. After removing the plug from the pipe joint, holding the removed plug on the first fitting member, and moving the intermediate position beyond the intermediate position by remote operation from the ground side by the first operating member, the intermediate position is Close, open the other end of the first cylindrical jig, and collect the plug on the ground side; and
Using a sealing jig provided with the elastic member and an operation mechanism for expanding and deforming the elastic member, and a deformation operating member capable of remotely operating the sealing jig,
With the intermediate position closed, the deformation operation member detachably connected to the sealing jig is hermetically inserted into a through hole formed in the first lid, and the sealing jig Is attached to the inside of the first cylindrical jig, then the intermediate position is opened, and the sealing jig is inserted into the buried pipe by remote operation from the ground side by the deformation operation member. A tool insertion process,
The remote operation of the operation mechanism from the ground side by the deformation operation member causes the elastic member to expand and deform inside the buried pipe to temporarily seal the branch hole from the inside of the buried pipe. How to remove branch fittings.   With the branch hole temporarily sealed between the temporary sealing step and the branch pipe joint collecting step, the first cylindrical jig is removed from the branch pipe joint by an operation from the ground side. The method for removing a branch pipe joint according to claim 1 or 2, wherein a first cylindrical jig collecting step for collecting on the ground side is provided. In the branch pipe joint collection step,
Using a second rotary operation tool comprising a first gripping member capable of gripping the branch pipe joint, and a second operation member capable of rotating the first gripping member,
In a state where the branch hole is temporarily sealed, the branch pipe joint is gripped by the first gripping member and rotated by remote operation from the ground side by the second operation member, and the branch pipe joint is The removal method of the branch pipe joint of any one of Claims 1-3 which remove | deviate from a branch hole and collect | recover on the ground side. In the receiving fixture fixing step,
Using a third rotary operation tool comprising a second grip member capable of gripping the cylindrical receiver and a third operation member capable of rotating the second grip member,
The cylindrical receptacle that is gripped by the second gripping member is screwed and fixed to the branching hole in an airtight manner by remote control from the ground side by the third operating member while the branching hole is temporarily sealed. The removal method of the branch pipe joint of any one of claim | item 1-4. The second cylindrical jig includes a connection portion for connecting to the cylindrical holder on one end side, a second lid body that can be opened and closed at the other end side, the connection portion, and the second lid body. A second partition member that can be freely opened and closed at an intermediate position thereof,
In the temporary sealing step,
Using a sealing jig provided with the elastic member and an operation mechanism for expanding and deforming the elastic member, and a deformation operation member capable of remotely operating the sealing jig, the deformation operation member from the ground side The elastic member is expanded and deformed inside the buried pipe by remote operation with respect to the operation mechanism, and the branch hole is temporarily sealed from the inside of the buried pipe,
In the second cylindrical jig connecting step,
In a state where the intermediate position is opened, the second cylindrical jig is connected to the cylindrical holder so that the deformation operation member enters the inside of the second cylindrical jig, and the second Airtightly inserted through the through-hole formed in the lid,
In the branch hole sealing step,
The elastic member is returned and deformed to a reduced diameter state by remote operation of the operation mechanism from the ground side by the deformation operation member, and the sealing jig is operated by remote operation from the ground side by the deformation operation member, After entering the inside of the second cylindrical jig through the opening of the cylindrical receptacle and moving it to a position beyond the intermediate position, the intermediate position is closed, and the second cylindrical jig Open the end side, collect the sealing jig to the ground side,
Using a fourth rotation operation tool comprising a second fitting member capable of fitting and holding the stopper member in a non-rotating state, and a fourth operation member capable of rotating the second fitting member.
In the state where the intermediate position is closed, the fourth operating member is hermetically inserted into a through-hole formed in the second lid body, and the plug member is fitted and held. After mounting the member inside the second cylindrical jig, the intermediate position is opened, and the second fitting member is moved to the cylindrical receiver side by remote operation from the ground side by the fourth operating member. The branch pipe joint removing method according to any one of claims 1 to 5, wherein the second fitting member is rotated and the plug member is screwed into the opening of the cylindrical receiver.

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