JP5823891B2 - Header collection device - Google Patents

Description

  By pulling the header connected to the new pipe, the present invention cuts and expands the existing pipe such as a steel pipe buried in the ground in the axial direction, and draws the new pipe into the expanded existing pipe. Thereafter, the present invention relates to a header recovery method and a header recovery device for recovering a header that has entered a pipe at an end portion on the drawing side of an existing pipe.

  Many conduits such as a gas conduit for sending fuel gas and a water pipe for flowing clean water are buried in the ground. Conventionally, pipes such as steel pipes and cast iron pipes formed by connecting with joints have been generally used as gas conduits. When these pipes become old, they may be damaged when a large external force such as an earthquake is applied. Therefore, renewal of an old pipe to a new pipe made of a more flexible material such as a polyethylene (PE) pipe has been promoted.

  If the entire section where the existing pipes are buried is dug in for the replacement work to the new pipes, the construction will be large, the construction period will be long, and the impact on the surrounding traffic situation will be large. Therefore, recently, for example, a non-open gas pipe replacement method in which replacement of an existing pipe and a new pipe is performed without excavation has been adopted, as in the method of collecting an existing buried pipe in Patent Document 1. FIG. 19 is a pre-process diagram showing a method for recovering an existing buried pipe according to Patent Document 1, and FIG. 20 is a post-process diagram following FIG.

  In Patent Document 1, as shown in FIG. 19, a wire rope 105 to which a cutting head 109 is attached is inserted into the buried pipe 101 from the start shaft 103a side and pulled from the arrival shaft 103b side to cut the buried pipe 101. Expand the diameter. After that, as shown in FIG. 20, the cutting head 109 is removed, the wire rope 105 and the buried pipe 101 are connected, and the new pipe 107 is connected to the rear end of the wire rope 105 on the start shaft 103a side. The rope 105 is pulled in from the reach shaft 103b side, and the buried pipe 101 and the new pipe 107 are replaced.

  Moreover, although patent document is not mentioned, in addition to patent document 1, while attaching a wire to the header (equivalent to the cutting head 1) front end and connecting a new pipe to the header rear end, the wire inserted from the start shaft side Is pulled from the reach shaft side, and the header is moved in the axial direction into the existing pipe that is buried, so that the existing pipe is cut and divided in the circumferential direction to be expanded in diameter. At the same time, as the header advances, the new pipe is drawn along the existing pipe whose diameter has been expanded, and the existing pipe and the new pipe are replaced without collecting the existing pipe.

  The header that has finished expanding the diameter of the existing pipe is drawn to the collecting shaft side and collected to the collecting section. The recovery unit has the same diameter as the existing pipe, the same length as that of the existing pipe, in addition to installing the pull-in side end of the entire existing pipe, which is about the full length of the header, in the vertical shaft. This is ensured by connecting an auxiliary pipe of a size in communication with the existing pipe in the reaching shaft. In the former case, when the existing pipe is cut by the header, this header is pulled into the pipe at the pull-in side end of the existing pipe, and the pull-in end where the header enters the pipe is After separating from the part, the header is taken out from the pipe at the pull-in side end and collected. In the latter case, when the existing pipe is cut by the header, this header is pulled into the pipe of the auxiliary pipe, and the connection between the auxiliary pipe in which the header enters the pipe and the existing pipe is released in the reaching shaft, The header is taken out from the auxiliary pipe and collected.

JP 2002-295727 A

  However, the conventional technique such as Patent Document 1 has the following problems. In order to recover the header (cutting head 1 of Patent Document 1) that has entered the pipe at the drawing-side end of the existing pipe, the operator cuts the drawing-side end of the existing pipe into which the header has entered from the existing pipe main body, This pull-in side end is carried out from the reach shaft to the ground. Alternatively, after the connection between the auxiliary pipe in which the header has entered the pipe and the existing pipe is released, the auxiliary pipe is carried out from the reaching shaft to the ground. When performing such work, the weight of the pull-in side end of the existing pipe with the header in the pipe is heavy, so it is dangerous for the operator to lift the pull-in side end to the ground for safety reasons. .

  In addition, when removing the header from the pull-in side end of an existing pipe that has been carried to the ground, the operator uses a tool such as a hammer to pull the pull-in side end (auxiliary pipe) with the header biting into the pipe. After being struck by a human hand and deformed to form a gap with the header in the pipe on the drawing side end or the like, the header is taken out from the pipe on the drawing side end or the like of the existing pipe. Therefore, even when the header is taken out, there is a danger to the worker for safety. In addition, the header that has digged into the pipe at the end of the existing pipe, etc., is collected and reused. If it is taken out, the header may be damaged by the impact when it is struck with a tool, and the work efficiency is low.

  The present invention has been made to solve the above-mentioned problems, and after expanding the diameter of an existing pipe, it is possible to safely and efficiently take out and collect the header from the pipe port at the drawing side end of the existing pipe. It is an object of the present invention to provide a header collection method and a header collection device that can be used.

  In order to solve the above problems, the header collection method and the header collection apparatus of the present invention have the following configuration.

(1) In the state where the header that is cut in the axial direction of the existing pipe buried in the ground between the starting vertical shaft and the reaching vertical shaft is connected to the new pipe drawn from the starting vertical shaft, In the header recovery method for recovering the header that has entered the end of the existing pipe after drawing the new pipe to the inner circumference side of the existing pipe whose diameter has been expanded by pulling from the side, at least after cutting the existing pipe, A first jig having a first abutting portion capable of abutting on an end surface of an end portion of the existing pipe disposed on the end portion and an end surface of the end portion of the existing pipe; Place the header through the notch or the opening and let it pass from the end of the existing pipe to the outside while supporting the existing pipe with the first abutting part abutting on the end face. And a header taking-out process that is pulled out. To.
(2) In the header recovery method described in (1), the second jig having a second contact portion that can contact the end surface of the end portion of the existing pipe is attached to the end portion of the existing pipe before the header removing step. It is arranged at a position opposite to the end face of the pipe, and when the header is pulled, the existing pipe which is going to move to the reaching shaft side by the pulling force acting on the existing pipe side is applied to the end face in the second contact. An existing pipe diameter increasing process for expanding the existing pipe diameter by the header while supporting the part in contact with the part, and a jig replacing process for replacing the second jig with the first jig, It is characterized by.
(3) In the header recovery method described in (2), the second contact portion is formed in an annular shape that can secure a hollow portion of the end portion corresponding to the diameter of the end portion of the existing tube, and the existing pipe is expanded. In the diameter step, after the second jig is disposed at a position facing the end surface of the end portion of the existing pipe, the second contact portion is an axis extending on the end surface of the end portion in the direction along the axial direction of the existing pipe. It is characterized in that it is brought into contact with a circular arc forming a part of a ring having a center or an annular shape on a line.
(4) In the header collection method according to any one of (1) to (3), after the first jig is disposed at a position facing the end surface of the end portion of the existing pipe in the header removal step, The first contact portion is brought into contact with an arc-shaped portion forming a part of a ring having a center on an axial line extending in the axial direction on the end surface of the end portion, and a notch or opening The portion is disposed in alignment with the hollow portion in the tube at the end portion.

(5) It has a header that expands the diameter by cutting an existing pipe buried in the ground between the starting vertical shaft and the reaching vertical shaft in the axial direction, and the header is connected to a new pipe drawn from the starting vertical shaft In this state, it is used with a pipe replacement device that pulls the new pipe into the inner circumference side of the existing pipe that has been expanded by pulling from the reaching shaft side, and when the header is pulled, pulling to the reaching shaft side that acts on the existing pipe Force, existing pipe support means for supporting the existing pipe to be moved to the reaching shaft side, a first abutting portion to be brought into contact with the end face of the existing pipe disposed in the reaching shaft, and to the reaching shaft side A first transmission part that transmits the tensile force of the existing pipe to the existing pipe support means via the first abutting part, and a notch part or an opening part that is formed so that the header can be passed therethrough. A first jig used at the time of diameter.
(6) In the header recovery apparatus described in (5), the first jig is disposed at a position facing the end surface of the end portion of the existing pipe, and the first contact portion is the shaft of the end surface of the end portion. On the axis extending in the direction, abuts with one part formed in an arc shape forming a part of a ring having a center, and the notch or the opening is aligned with the hollow part in the pipe at the end. It is characterized by being arranged.
(7) In the header recovery device described in (5) or (6), the second contact portion that contacts the end surface of the end portion of the existing pipe, and the second contact portion And a second transmission part that transmits the existing pipe to the existing pipe support means, and includes a second jig that is used when the diameter of the existing pipe is expanded by the header.
(8) In the header recovery device described in (7), the second contact portion is formed in an annular shape that can secure a hollow portion in the end pipe corresponding to the diameter of the existing pipe, The jig is disposed at a position facing the end face of the end portion of the existing pipe, and the second contact portion is a circle having a center on the end face of the end portion and an axis extending in the direction along the axial direction of the existing pipe. It abuts on an arcuate shape forming a part of the ring or an annular shape.
(9) In the header recovery device described in any one of (5) to (8), the existing pipe support means applies a reaction force of the tensile force transmitted from the first jig or the second jig. It has a support part, and the support part is formed so that it can move with respect to the direction along the axial direction of an existing pipe, It is characterized by the above-mentioned.
(10) In the header recovery device described in (9), the existing pipe support means is a hydraulic drive source having a rod that can be expanded and contracted with respect to a fixed cylinder, and the support portion is provided at the tip of the rod. It is characterized by that.
(11) In the header recovery device described in any one of (5) to (10), the first jig is formed of a flat plate, and the first contact portion is disposed as a part of the first transmission portion. In addition, the cutout portion is formed by cutting out on the radially inner side of the first contact portion.
(12) In the header recovery device described in any one of (7) to (11), the second jig is composed of divided pieces that are divided into a plurality in the direction along the circumferential direction of the existing pipe, A plurality of divided pieces are detachable and integrally formed.

  The operation and effect of the header recovery method and header recovery apparatus of the present invention having the above-described configuration will be described.

(1) In the state where the header that is cut in the axial direction of the existing pipe buried in the ground between the starting vertical shaft and the reaching vertical shaft is connected to the new pipe drawn from the starting vertical shaft, In the header recovery method for recovering the header that has entered the end of the existing pipe after drawing the new pipe to the inner circumference side of the existing pipe whose diameter has been expanded by pulling from the side, at least after cutting the existing pipe, A first jig having a first abutting portion capable of abutting on an end surface of an end portion of the existing pipe disposed on the end portion and an end surface of the end portion of the existing pipe; Place the header through the notch or the opening and let it pass from the end of the existing pipe to the outside while supporting the existing pipe with the first abutting part abutting on the end face. And a header taking-out process that is pulled out. Therefore, in the header take-out step, after the first jig is attached, the header is further pulled to the reaching shaft side, so that the header cuts the drawing-side end portion of the existing pipe in the axial direction. It passes through the notch or opening and is pulled out from the pipe opening at the end of the existing pipe on the drawing side. At this time, as the header is pulled, a tensile force toward the reaching shaft side acts on the existing pipe, and the existing pipe attempts to move to the reaching shaft side. However, the first contact portion of the first jig is already provided. Since the existing pipe is supported by being brought into contact with the end surface of the pull-in side end portion of the pipe, the reaction force due to this tensile force acts on the end face of the pull-in side end portion of the existing pipe through the first contact portion, Existing pipes do not move to the reach shaft side. Therefore, the header is pulled out from the pull-in side end of the existing pipe and collected by pulling the header toward the reaching shaft side so that the header passes through the notch or opening of the first jig. Can do.

  Also, in the header collection method of the present invention, unlike the prior art, when the header is taken out and collected from the pull-in side end of the existing pipe, the pull-in side end of the existing pipe in which the header enters the pipe is cut from the existing pipe main body. There is no need to perform the operation of connecting the auxiliary pipe with the existing pipe and then releasing the connection between the auxiliary pipe with the header and the existing pipe. In addition, the worker can easily recover the header by simply placing the first jig at the end of the existing pipe on the pull-in side and continuously pulling the header to the reach shaft side. It can be performed more efficiently than the conventional recovery operation.

  Further, the operator can take out the header from the pull-in side end of the existing pipe and collect it only by placing the first jig on the end surface of the pull-in side end of the existing pipe and pulling the header. Therefore, the header can be collected safely without any danger to the worker. In addition, the worker can lift the header collected from the existing pipe in the vertical shaft to the ground, and it is only necessary to lift the header alone to the ground. Compared with the prior art in which the header that has entered the pipe together with the part and the like is carried out from the reach shaft to the ground, it becomes smaller. In addition, when collecting the header, the existing pipe is not struck with a tool such as a hammer as in the prior art, and the header is not damaged due to the impact of the tool.

  Therefore, after expanding the diameter of the existing pipe, an excellent effect is obtained that the header can be safely and efficiently taken out and collected from the inlet of the drawing-side end of the existing pipe.

(2) In the header recovery method described in (1), the second jig having a second contact portion that can contact the end surface of the end portion of the existing pipe is attached to the end portion of the existing pipe before the header removing step. It is arranged at a position opposite to the end face of the pipe, and when the header is pulled, the existing pipe which is going to move to the reaching shaft side by the pulling force acting on the existing pipe side is applied to the end face in the second contact. An existing pipe diameter increasing process for expanding the existing pipe diameter by the header while supporting the part in contact with the part, and a jig replacing process for replacing the second jig with the first jig, In the existing pipe expansion process, for example, the diameter of the existing pipe can be increased by, for example, pulling the header with the wire wound around the wire take-up device etc. While cutting the shaft in the axial direction, the cut-off portion is the enlarged portion of the header in the circumferential direction of the existing pipe To do by expanding the sliding resistance of the header when moving the tube of the existing pipe is very large. Therefore, when the header is pulled with such a large force, the pulling force of the existing pipe that the existing pipe itself tries to move to the reaching shaft side acts greatly as the header is pulled. At this time, by attaching the second jig to the end of the existing pipe (the end on the drawing side) and supporting the existing pipe by bringing the second abutting portion into contact with the end surface of the drawing side end of the existing pipe, By applying a reaction force against the pulling force of the existing pipe that is about to move to the reach shaft side to the end face of the existing pipe at the pull-in side, the existing pipe can be held without moving during the diameter expansion operation. . Therefore, when the diameter of the existing pipe is expanded, the header is pulled with the above-mentioned wire while the existing pipe is fixed. Can be calibrated.

  Also, in the existing pipe diameter expansion process, the existing pipe was pulled and the existing pipe was cut and expanded in diameter while supporting the existing pipe using the second jig. When the pipe reaches the end of the pipe, if the header is pulled as it is, the header and the second jig interfere with each other, the header cannot pass through the second jig, and the outside of the existing pipe ends. It cannot be pulled out. Then, after performing a jig | tool replacement | exchange process and exchanging a 2nd jig | tool for a 1st jig | tool, as above-mentioned, by pulling a header to the arrival shaft side, a header is made into the notch part of a 1st jig | tool, or It is possible to pass through the opening and pull it out from the drawing-side end of the existing pipe to collect it.

(3) In the header recovery method described in (2), the second contact portion is formed in an annular shape that can secure a hollow portion of the end portion corresponding to the diameter of the end portion of the existing tube, and the existing pipe is expanded. In the diameter step, after the second jig is disposed at a position facing the end surface of the end portion of the existing pipe, the second contact portion is an axis extending on the end surface of the end portion in the direction along the axial direction of the existing pipe. It is characterized in that the wire wound on the wire take-up device exemplified above is connected to the arc of the circular ring forming a part of the ring having the center on the line, or an annular shape. It can be connected to the header in the pipe through the ring of the second abutting portion, and even if the second jig is attached to the end of the existing pipe (the end on the pull-in side), the header is pulled with the wire to the reaching shaft side be able to. In addition, when the header is pulled, the reaction force of the tensile force applied to the existing pipe acts on the end surface of the end portion on the drawing side of the annular existing pipe via the arcuate or annular second contact portion. If the reaction force at this time acts along the axial start shaft side of the existing pipe, the existing pipe can be held without being tilted and kept moving, so this axial start shaft When the header is pulled straight in the axial direction toward the axially reaching shaft side opposite to the side, the header can move smoothly in the pipe of the existing pipe without locally hitting the inner wall of the existing pipe. Therefore, when the header is pulled into the pipe of the existing pipe by the wire, the load applied when pulling the wire is further reduced in the wire drawing device, the existing pipe is cut in the axial direction, and the cut portion is expanded. The diameter can be expanded by expanding in the circumferential direction of the tube.

(4) In the header collection method according to any one of (1) to (3), after the first jig is disposed at a position facing the end surface of the end portion of the existing pipe in the header removal step, The first contact portion is brought into contact with an arc-shaped portion forming a part of a ring having a center on an axial line extending in the axial direction on the end surface of the end portion, and a notch or opening Since the first portion is in contact with the end surface of the end portion (retraction side end portion), the first contact portion is arranged in alignment with the hollow portion in the end portion of the pipe. If one jig is arranged at a position facing the pull-in side end portion of the existing pipe, the existing pipe can be supported by the first jig so that the existing pipe does not move by simply pulling the header further to the reach shaft side. At the same time, let the cutter of the header pass through the notch or opening of the first jig. Diametrically enlarged pull end of the existing pipe in the axial direction, it is possible to take out the headers easily to the outside from the tube opening of the retraction side end of the existing pipe.

(5) It has a header that expands the diameter by cutting an existing pipe buried in the ground between the starting vertical shaft and the reaching vertical shaft in the axial direction, and the header is connected to a new pipe drawn from the starting vertical shaft In this state, it is used with a pipe replacement device that pulls the new pipe into the inner circumference side of the existing pipe that has been expanded by pulling from the reaching shaft side, and when the header is pulled, pulling to the reaching shaft side that acts on the existing pipe Force, existing pipe support means for supporting the existing pipe to be moved to the reaching shaft side, a first abutting portion to be brought into contact with the end face of the existing pipe disposed in the reaching shaft, and to the reaching shaft side A first transmission part that transmits the tensile force of the existing pipe to the existing pipe support means via the first abutting part, and a notch part or an opening part that is formed so that the header can be passed therethrough. A first jig used at the time of diameter. Thus, after the header recovery device of the present invention is installed in the reaching shaft, the header moves from the starting shaft toward the reaching shaft, and after cutting the existing pipe buried in the ground, When the tip portion is located immediately before reaching the end of the existing pipe located at the end of the existing pipe (the end on the pull-in side), the first jig has an end surface at the end on the pull-in side of the existing pipe. And the first contact portion are attached in a state where they are in contact with each other. After installing the first jig, the header is further pulled by the pipe replacement device to the reach shaft side, so that the header cuts the drawing side end of the existing pipe in its axial direction or cuts the drawing side end. Later, it passes through the notch (or opening) of the first jig, and is pulled out from the tube opening at the drawing-side end of the existing pipe. At this time, as the header is pulled, the existing pipe is subjected to a pulling force toward the reach shaft, and the existing pipe tries to move toward the reach shaft, but the reaction force of this pull force is supported by the existing pipe. The means acts on the end surface of the end portion on the drawing side of the existing pipe through the first transmission part and the first contact part, and the existing pipe does not move to the reaching shaft side. Therefore, by pulling the header to the reach shaft side with the pipe changer so that the header passes through the notch (or opening) of the first jig, the header is completely removed from the pull-in side end of the existing pipe to the outside. It can be pulled out and recovered.

  Also, in the header recovery device of the present invention, unlike the prior art, when the header is taken out from the end of the existing pipe (the end on the drawing side) and recovered, the end on the drawing side of the existing pipe in which the header has entered is installed. The work of cutting from the pipe body and the work of releasing the connection between the auxiliary pipe containing the header and the existing pipe after connecting the auxiliary pipe with the existing pipe are completely unnecessary. In addition, the worker can easily recover the header by simply attaching the first jig to the pull-in side end of the existing pipe and continuously pulling the header to the arrival shaft side by the pipe replacement device. It can be performed more efficiently than the conventional recovery operation.

  In addition, the operator simply places the first jig on the end surface of the existing pipe at the drawing side end, and pulls the header from the drawing pipe end of the existing pipe by simply pulling the header with the pipe changing device. Since it can be taken out and collected, the header can be collected safely without any danger to the operator. In addition, the worker can lift the header collected from the existing pipe in the vertical shaft to the ground, and it is only necessary to lift the header alone to the ground. Compared with the prior art in which the header that has entered the pipe together with the part and the like is carried out from the reach shaft to the ground, it becomes smaller. In addition, when collecting the header, the existing pipe is not struck with a tool such as a hammer as in the prior art, and the header is not damaged due to the impact of the tool.

  Therefore, after expanding the diameter of the existing pipe, an excellent effect is obtained that the header can be safely and efficiently taken out and collected from the inlet of the drawing-side end of the existing pipe.

(6) In the header recovery apparatus described in (5), the first jig is disposed at a position facing the end surface of the end portion of the existing pipe, and the first contact portion is the shaft of the end surface of the end portion. On the axis extending in the direction, abuts with one part formed in an arc shape forming a part of a ring having a center, and the notch or the opening is aligned with the hollow part in the pipe at the end. For example, a wire wound by a wire take-up device or the like installed in the proximity position of the reaching shaft is inserted from the reaching shaft to the starting shaft side, and when the diameter is expanded, for example, In the case of a pipe replacement device or the like that expands the existing pipe by pulling the header connected to this wire to the reach shaft side, even if the wire is inserted through the pipe of the existing pipe, By placing the first jig in the notch or opening, the end of the existing pipe Through pull-side end portion), it is possible to pull the headers.

  By the way, the header has a guide roller for guiding the header body in the traveling direction along the inner peripheral surface of the existing pipe, a cutter for cutting the existing pipe in its axial direction, and the existing pipe divided by the cutter in the circumferential direction. There is a case where it is configured to have a frustoconical diameter-expanded portion for expanding the diameter. In such a header, when the diameter is expanded, the cutter and the expanded diameter portion move along a moving path from the outer circumference of the existing pipe to the outside of the function.

  In the header recovery device of the present invention, the first abutting portion of the first jig is in contact with one portion formed in an arcuate shape in the end surface of the retracted side end portion of the existing pipe, The existing pipe is supported by the existing pipe support means via the first transmission portion. As a result, the existing pipe is held, and in this state, when the header is pulled by the above-described wire from the reach shaft side, the cutter and the enlarged diameter portion having a moving path outside the outer circumference of the existing pipe are provided. In addition, a guide roller or the like can move and pass toward the notch or the opening. Therefore, the header can be pulled out from the drawing-side end portion of the existing pipe without interfering with the first jig.

(7) In the header recovery device described in (5) or (6), the second contact portion that contacts the end surface of the end portion of the existing pipe, and the second contact portion And a second transmission part for transmitting to the existing pipe support means through the header, and a second jig used when the diameter of the existing pipe is expanded by the header. The diameter work is performed by, for example, pulling the header with the above-mentioned wire with a large force of several to several tens (t) toward the reaching shaft side, while cutting the existing pipe in the axial direction with the cutter of the header, Since the expanded diameter portion extends in the circumferential direction of the existing pipe, the sliding resistance of the header when moving in the pipe of the existing pipe is very large. Therefore, when the header is pulled with such a large force, the pulling force of the existing pipe that the existing pipe itself tries to move to the reaching shaft side acts greatly as the header is pulled. At this time, the second jig is attached to the end portion of the existing pipe (the pull-in side end portion), so that the second contact portion comes into contact with the end surface of the existing pipe at the pull-in side end portion and moves to the reach shaft side. The tensile force of the existing pipe acts on the existing pipe support means via the second transmission portion. Since the existing pipe support means causes the reaction force of this tensile force to act toward the end face of the existing pipe at the pull-in side, the existing pipe can be held without moving during the diameter expansion operation. Therefore, at the time of expanding the diameter of the existing pipe, by pulling the header with the above-mentioned wire while fixing the existing pipe, as illustrated, a large force of several to several tens (t) (the tensile force of the header) It is transmitted without loss to the header in the existing pipe, and the existing pipe can be efficiently cut and expanded in diameter.

(8) In the header recovery device described in (7), the second contact portion is formed in an annular shape that can secure a hollow portion in the end pipe corresponding to the diameter of the existing pipe, The jig is disposed at a position facing the end face of the end portion of the existing pipe, and the second contact portion is a circle having a center on the end face of the end portion and an axis extending in the direction along the axial direction of the existing pipe. Since the wire wound around the wire take-up device illustrated above is connected to the header in the pipe of the existing pipe and the second wire. Even if the second jig is attached to the end of the existing pipe, the header can be pulled to the reaching shaft side with the wire even if the second jig is attached to the end of the existing pipe. Also, as exemplified above, the header is pulled with a large force of several to several tens (t), and the reaction force of the tensile force applied to the existing pipe is passed through the arc-shaped or annular second contact portion, It acts on the end surface of the end of the annular existing pipe (the end on the pull-in side). If the reaction force at this time acts along the axial start shaft side of the existing pipe, the existing pipe can be held without being tilted and kept moving, so this axial start shaft When the header is pulled straight in the axial direction toward the axially reaching shaft side opposite to the side, the header can move smoothly in the pipe of the existing pipe without locally hitting the inner wall of the existing pipe. Therefore, when the header is pulled into the pipe of the existing pipe by the wire, the load applied when pulling the wire is further reduced in the wire drawing device, the existing pipe is cut in the axial direction, and the cut portion is expanded. The diameter can be expanded by expanding in the circumferential direction of the tube.

(9) In the header recovery device described in any one of (5) to (8), the existing pipe support means applies a reaction force of the tensile force transmitted from the first jig or the second jig. It has a support part, and the support part is formed to be movable with respect to the direction along the axial direction of the existing pipe. When the second jig is attached to the end of the pipe (the end on the pull-in side) or after the diameter of the existing pipe is increased, the second jig is removed and the first jig is replaced with the second jig. When the support portion of the existing pipe support means is moved away from the pull-in side end of the existing pipe, for example, when being attached to the pull-in side end, the operator moves the first jig or the second jig to When it is attached to and detached from the end portion on the pull-in side, the operation becomes easy.

  On the other hand, when the first abutting portion is brought into contact with the end surface of the existing pipe at the drawing side end and the first jig is arranged at the drawing side end of the existing pipe, the support portion is placed on the drawing side end of the existing pipe. It moves to the direction which adjoins, and the support part of an existing pipe support means and the 1st transmission part of a 1st jig | tool are contact | abutted. As a result, the reaction force of the tensile force acting on the existing pipe is transferred from the support part of the existing pipe support means via the first transmission part and the first contact part of the first jig to the drawing side end part of the existing pipe. It comes to act on the end face. In addition, when the second abutting portion is brought into contact with the end face of the existing pipe at the drawing side end and the second jig is arranged at the drawing side end of the existing pipe, the support portion is close to the drawing side end of the existing pipe. The support part of the existing pipe support means and the second transmission part of the second jig are brought into contact with each other. As a result, the reaction force of the tensile force acting on the existing pipe is transferred from the support part of the existing pipe support means via the second transmission part and the second contact part of the second jig to the drawing side end part of the existing pipe. It comes to act on the end face.

(10) In the header recovery device described in (9), the existing pipe support means is a hydraulic drive source having a rod that can be expanded and contracted with respect to a fixed cylinder, and the support portion is provided at the tip of the rod. Therefore, the existing pipe support means can be configured in a space-saving manner to stably support the existing pipe to be moved to the reach shaft side with a large force. The support means can also be installed in a reaching shaft with a small space. For example, when attaching or detaching the first jig or the second jig, the first jig or the second jig is to be sandwiched between the support portion of the existing pipe support means and the pull-in side end portion of the existing pipe. In this case or when it is desired to change the position of the support portion, the rod can be freely expanded and contracted and stopped by a simple operation, so that the workability when changing the position of the support portion is improved.

(11) In the header recovery device described in any one of (5) to (10), the first jig is formed of a flat plate, and the first contact portion is disposed as a part of the first transmission portion. And the cutout portion is formed by cutting out the inside of the first contact portion in the radial direction. Therefore, the first jig is obtained by machining one flat plate. It can be formed at low cost. In addition, for example, in a state where the first abutting portion is in contact with the end face of the end portion of the existing pipe (the pull-in side end portion), the existing pipe support means is supported on the axial start shaft side of the existing pipe. By pressing the portion against the first transmission portion, the first jig can be easily fixed by being fixed to the drawing-side end portion of the existing pipe. Furthermore, in a state where the first abutting portion is in contact with the end face of the existing pipe at the drawing side end, the header is simply fixed to the drawing side end of the existing pipe. The passage can be easily moved to the outside of the existing pipe at the drawing side end through a notch communicating with the inside of the pipe at the drawing side end of the existing pipe.

(12) In the header recovery device described in any one of (7) to (11), the second jig is composed of divided pieces that are divided into a plurality in the direction along the circumferential direction of the existing pipe, Since it is characterized in that a plurality of divided pieces are detachable and integrally formed, for example, with a divided piece obtained by dividing the annular ring into two pieces, the two divided pieces are abutted and connected to each other on both sides of the existing pipe. In the case of the second jig, when the operator attaches the second jig to the end of the existing pipe (the pull-in side end) in the reach shaft, first the upper half of the divided piece is pulled into the pull-in side end of the existing pipe. And connect it to the lower half piece. As a result, when the operator enters the reach shaft and attaches the second jig to the pull-in side end of the existing pipe, there is no need to lift the entire second jig at the same time. The weight can be shared and attached to the end of the existing pipe on the pull-in side, and the work burden (labor) applied to the operator can be reduced within a narrow reach shaft.

  The header also includes a guide roller that guides the header body in the direction of travel along the inner peripheral surface of the existing pipe, a cutter that cuts the existing pipe in its axial direction, and an existing pipe divided by the cutter in the circumferential direction. There is a case where it is configured to have a frustoconical diameter-expanded portion for expanding the diameter. In such a header, a plurality of guide rollers are arranged from the front end to the rear end of the header, the enlarged diameter portion is arranged at the rear end of the header, and the cutter is arranged on the front end side from the enlarged diameter portion. In the case of the second jig, which is connected to the upper and lower parts sandwiching the existing pipe, the tip of the header is at a position close to the inlet of the end of the existing pipe in the reaching shaft Since the cutter may come into contact with the second jig, for example, only the lower half of the second jig that intersects the movement path of the cutter is removed to prevent the cutter from contacting. On the other hand, when the header continues to be pulled toward the reaching shaft side until the header comes out from the external pipe port at the end of the existing pipe on the drawing side, the reaction force against the pulling force of the header is reduced in the upper half of the second jig. The movement of the existing pipe can be prevented by acting on the split piece.

It is explanatory drawing which shows a mode that the existing pipe | tube is replaced with a new installation pipe | tube using the header collection | recovery apparatus which concerns on embodiment. It is explanatory drawing which shows a wire drawing-in apparatus among the pipe | tube replacement apparatuses which concern on this embodiment. It is a front view which shows a header among the pipe | tube exchange apparatuses which concern on this embodiment. It is a front view which shows the header collection | recovery apparatus which concerns on embodiment, and is a figure which shows a mode that the 2nd jig | tool is used. It is a top view of the header collection | recovery apparatus shown in FIG. It is a figure which shows the entrance side board member of the header collection | recovery apparatus which concerns on embodiment. It is a figure which shows the exit side board member of the header collection | recovery apparatus which concerns on embodiment. It is a figure which shows the support part of the header collection | recovery apparatus which concerns on embodiment. It is a figure which shows the 1st jig | tool of the header collection | recovery apparatus which concerns on embodiment, (a) is a front view, (b) It is a side view. It is a figure explaining the range which the 1st contact part of a 1st jig | tool contacts the end surface of the drawing-in side edge part of an existing pipe. It is a figure which shows the upper side division | segmentation piece among the 2nd jig | tools of the header collection | recovery apparatus which concerns on embodiment, (a) is a front view, (b) It is a side view. It is a figure which shows the lower side division piece among 2nd jig | tool, (a) is a front view, (b) It is a side view. It is explanatory drawing which shows the state which connected the upper side division piece of the 2nd jig | tool, and the lower side division piece of the 2nd jig | tool. It is a figure explaining the range which the 2nd contact part of a 2nd jig | tool contacts the end surface of the drawing-in side edge part of an existing pipe. It is a 1st process drawing which shows the existing pipe diameter increasing process of the header collection | recovery method which concerns on embodiment. FIG. 16 is a second process diagram subsequent to FIG. 15, and is an explanatory diagram illustrating a state immediately before the end of the existing pipe diameter increasing process. FIG. 17 is a third process diagram following FIG. 16, and is an explanatory diagram showing a state in which a jig exchanging process is performed. FIG. 18 is a fourth process diagram following FIG. 17 and is an explanatory diagram showing a state immediately after the header is pulled out from the pipe port at the pull-in side end in the header taking-out process. It is a front process figure which shows the collection | recovery method of the existing underground pipe | tube concerning a prior art. FIG. 20 is a post-process diagram following FIG. 19.

  Hereinafter, embodiments of a header collection method and a header collection apparatus according to the present invention will be described in detail with reference to the drawings. Drawing 1 is an explanatory view showing roughly signs that an existing pipe is replaced with a new installation pipe using a header recovery device concerning an embodiment.

  First, the non-cutting gas pipe replacement method using the header recovery apparatus according to the present invention will be briefly described with reference to FIG. This non-cut-off gas pipe replacement method is a method of pulling the header 11 with the wire W, and as shown in FIG. 1, a pipe replacement device comprising the wire W, the header 11, the wire drawing device 20, the wire take-up drum 28, and the like. 10 and the header collection device 30 are used. In the non-open-cut gas pipe replacement method, first, the start shaft 1 and the arrival shaft 2 are dug in a predetermined position where the existing tube 5 is buried, and then the existing tube 5 is cut on both sides of the start shaft 1 and the arrival shaft 2 side. To do. The cutting of the existing pipe 5 on the side of the reaching shaft 2 is performed at a position away from the inner wall 2a of the reaching shaft 2, and the pull-in side end 6 (end) of the existing pipe 5 is arranged in the reaching shaft 2. . Next, the header collection device 30 and the wire drawing device 20 according to this embodiment are installed in the reaching shaft 2. The header recovery device 30 is disposed between the inner wall 2 a of the reaching shaft 2 and the wire drawing device 20.

  Next, in the reaching shaft 2, the wire W is inserted into the pipe of the existing tube 5, and the starting end portion (the left end portion in FIG. 1) of the wire W reaches the starting shaft 1 until it reaches the starting shaft 1. send. On the other hand, the starting end portion of the wire W that has reached the start shaft 1 is connected to the tip end portion of the header 11 (the right end portion in FIG. 1). Further, a new pipe 5N made of, for example, polyethylene is connected to the rear end portion (left end portion in FIG. 1) of the header 11. When the wire W is pulled toward the arrival shaft 2 by the wire drawing device 20, the header 11 is drawn into the existing pipe 5 and moves toward the arrival shaft 2.

  Next, the tube replacement device 10 will be described with reference to FIG. The pipe replacement device 10 has a header 11 that expands the diameter by cutting the existing pipe 5 buried in the ground between the starting shaft 1 and the reaching shaft 2 in the axial direction L thereof. In the state where the header 11 is connected to the newly installed pipe 5N drawn from the start shaft 1, the wire W wound around the wire take-up drum 28 installed on the ground GL close to the reaching shaft 2 is transferred by the wire retracting device 20. The new pipe 5N is drawn into the inner circumference 5a side of the existing pipe 5 whose diameter has been expanded by pulling it toward the reaching shaft 2 side.

  The wire drawing device 20 will be described with reference to FIG. FIG. 2 is an explanatory view showing a wire drawing device.

  The wire drawing device 20 is a well-known device that is commercially available, and in this embodiment, has a capability of pulling the wire W with a force of several to several tens (t). As shown in FIG. 2, the wire drawing device 20 includes a guide member 21, a pulling member 22, a wire holding member 23, a clamp member 24, a pulley 27, and the like. As shown in FIG. 2, the guide member 21 is formed in a substantially J-shape, and has a groove capable of holding the wire W at the edge along the outer periphery.

  The pulling member 22 clamps or unscrews the wire W inserted between the guide member 21 and the first hydraulic cylinder 25A, which is the first drive source, by linear movement by the expansion and contraction of the rod 25B. Clamp. Further, the pulling member 22 is moved to the outer peripheral edge portion of the guide member 21 around the shaft center M by a linear motion by the expansion and contraction operation of the rod 26B with respect to the second hydraulic cylinder 26A as the second driving source. A predetermined range is arranged to be rotatable with respect to the swinging direction P along. The pulling member 22 is clamped together with the guide member 21 by starting to move from the position Pa to the position Pb in the swinging direction P at the same time as the guide member 21 is switched from the unclamped state to the clamped state as shown in FIG. The pulled wire W is pulled up to the reaching shaft 2 side while being pulled toward the reaching shaft 2 side along the outer peripheral edge of the guide member 21.

  The wire holding member 23 has a groove capable of holding the wire W. The clamp member 24 is formed in a substantially arc shape, and has a groove capable of holding the wire W at the outer peripheral edge portion of the toe portion. The clamp member 24 is configured as a mechanism for converting the linear motion caused by the expansion and contraction motion of the rod 26B into a rotational motion with respect to the second hydraulic cylinder 26A. It is provided so that rotation is possible. Thus, the clamp member 24 can be moved close to or away from the wire holding member 23. The clamp member 24 switches from the clamped state to the unclamped state with respect to the guide member 21, the holding of the wire W is released, and at the same time, the wire W does not return to the start shaft 1 side in the vicinity of the wire holding member 23. The wire W inserted between the grooves of the wire holding member 23 is clamped.

  Thus, in the wire drawing device 20, the pulling member 22 moves in the swinging direction P along the outer peripheral edge of the guide member 21 in a state where the wire W is held by the wire holding member 23 and the clamp member 24. W is pulled up to the reach shaft 2 side by a predetermined length. Then, by repeating this pulling-up operation for a plurality of cycles in continuous operation, the wires W are sequentially sent out and drawn into the reaching shaft 2 side.

  Next, the header 11 will be described with reference to FIG. FIG. 3 is a front view showing the header. As shown in FIG. 3, the header 11 is roughly divided into a header main body portion 12 and an enlarged diameter portion 15. In this embodiment, the header main body portion 12 formed integrally with the enlarged diameter portion 15 includes a guide. The roller 13 and the cutter 14 are rotatably supported. Further, a wire attachment portion 12 </ b> W that can be connected to the start end portion of the wire W is formed on the front side of the header main body portion 12. A new pipe mounting portion 15N that can be connected to the new pipe 5N is formed on the rear side of the enlarged diameter portion 15, and the enlarged diameter portion 15 expands the existing pipe 5 cut and divided by the cutter 14 in the circumferential direction C. Let the diameter. Note that the header 11 shown in FIG. 3 is merely a configuration exemplified for explaining the function thereof, and the configuration and function of the header are not limited to the present embodiment, and can be variously changed.

  Next, the header collection | recovery apparatus 30 is demonstrated using FIG. 1 and FIG. 4 thru | or FIG. FIG. 4 is a front view showing the header recovery apparatus according to the embodiment, and shows a state in which the second jig is used. FIG. 5 is a plan view of the header recovery apparatus shown in FIG.

  The header collection | recovery apparatus 30 is used with the pipe replacement apparatus 10 as shown in FIG. The header recovery device 30 includes existing pipe support means 40, a first jig 50, and a second jig 60. As shown in FIGS. 4 and 5, the existing pipe support means 40 includes four frame members 31, an inlet side plate member 32, an outlet side plate member 33, two cylinder support members 34, and two cylinder support portion reinforcing members 35. Built into the body.

  First, the body will be described. FIG. 6 is a diagram illustrating an inlet side plate member of the header recovery device according to the embodiment. FIG. 7 is a diagram illustrating an outlet side plate member of the header recovery device according to the embodiment. The inlet side plate member 32 is made of metal, and as shown in FIG. 6, is a rectangular flat plate having a through hole 32 </ b> H having substantially the same outer diameter (see FIG. 12) as a second jig 60 described later. The diameter of the through hole 32H is smaller than the outer diameter of the first jig 50 and the outer diameter of the second jig 60, and the first jig 50 and the second jig 60 cannot pass through the through hole 32H. Yes. The outlet side plate member 33 is made of metal, and has a through hole 33H through which the wire W can be inserted and is a rectangular flat plate formed in the same size as the inlet side plate member 32, as shown in FIG.

  As shown in FIGS. 4 and 5, the inlet side plate member 32 and the outlet side plate member 33 are arranged with their surfaces facing each other in parallel, and both ends of the four rod-shaped frame members 31 are respectively connected to the inlet side plate member 32. And the outlet side plate member 33 are connected and fixed to the four corners. Two flat cylinder support members 34 are attached to the outlet side plate member 33 on both the left and right sides (corresponding to the left and right direction in FIG. 7) sandwiching the through hole 33H. Further, in FIG. 5, the cylinder support portion reinforcing member 35 is installed on the two frame members 31 located on the upper side and one of the cylinder support members 34, and the other cylinder support portion reinforcing member 35 is placed on the lower side. The two frame members 31 positioned and the other one of the cylinder support members 34 are installed. Each of the two cylinder support member reinforcing members 35 has high rigidity to overcome the pulling force T1 (force of several to several tens (t)) of the wire W toward the reaching shaft 2 side by the wire drawing device 20 and has two frame members. 31 and the outlet side plate member 33 through a cylinder support member 34.

  Next, the existing pipe support means 40 will be described. The existing pipe support means 40 tries to move to the reaching vertical shaft 2 side by the pulling force T1 acting on the existing vertical pipe 2 acting on the existing pipe 5 as the header 11 connected to the wire W is pulled by the wire drawing device 20. The existing pipe 5 to be supported is supported. The existing pipe support means 40 includes a support portion 44 that causes the reaction force T2 of the tensile force T1 transmitted from the first jig 50 or the second jig 60 to act on a plane, and the support portion 44 is provided with the existing pipe 5. It is formed to be movable with respect to a direction along the axial direction L.

  Specifically, the existing pipe support means 40 is a hydraulic drive source having a rod 43 that can be expanded and contracted with respect to the cylinder 41 fixed to the cylinder support portion reinforcing member 35. The cylinder 41 has a first port 42a that supplies hydraulic oil into the cylinder 41 from a hydraulic supply source (not shown), and a second port 42b that returns hydraulic oil from the cylinder 41 to the hydraulic supply source. The rod 43 can be freely expanded and contracted to move forward or backward by controlling the hydraulic oil flowing through the cylinder 41 through the first port 42a and the second port 42b. In the present embodiment, the rods 43 of the two cylinders 41 extend and contract at substantially synchronized timing. The existing pipe support means 40 provided with the two sets of cylinders 41 and the rods 43 generates an external force that is a reaction force T2 against the pulling force T1 of the wire W toward the reaching shaft 2 by the wire drawing device 20. It has the performance that can exert the driving force to act on.

  A support portion 44 is provided at the tip of the rod 43. FIG. 8 is a diagram illustrating a support portion of the header recovery device according to the embodiment. As shown in FIG. 8, the support portion 44 is a flat plate having a through hole 44H through which the wire W can be inserted and formed in a substantially annular surface shape. The distal ends of the two rods 43 are fixed to the support portion 44 in a state of straddling the through hole 44H as shown in FIGS. The diameter of the through hole 44H is a diameter through which the new pipe 5N connected to the header 11 can be inserted in addition to the header 11 (expanded portion 15), so that the header 11 and the new pipe 5N can pass through the through hole 44H. It has become. In addition, the diameter of the through hole 44H is smaller than the outer diameter of the first jig 50 and the outer diameter of the second jig 60, and the first jig 50 and the second jig 60 cannot pass through the through hole 44H. It has become.

  Next, the first jig 50 will be described. The first jig 50 includes a first abutment portion 52 that abuts against the end surface 6 a of the pull-in side end portion 6 of the existing pipe 5 disposed in the reaching shaft 2, and the reaching shaft 2 of the wire W by the wire drawing device 20. The first transmission part 51 that transmits the pulling force T1 to the side to the existing pipe support means 40 via the first contact part 52, and the first jig notch part 53 (so that the header 11 can pass through) A notch). The first jig 50 is used after the existing pipe 5 is expanded in diameter. Drawing 9 is a figure showing the 1st jig of the header recovery device concerning an embodiment, (a) is a front view and (b) is a side view. FIG. 10 is a diagram illustrating a range in which the first abutting portion of the first jig abuts on the end surface of the drawing-side end portion of the existing pipe.

  Specifically, as shown in FIG. 9, the first jig 50 is formed of an arc-shaped flat plate, and the first contact portion 52 is disposed as a part of the first transmission portion 51. The first jig cutout portion 53 is formed by cutting out on the radially inner side of the first contact portion 52. The first jig 50 includes, for example, a wire attachment portion 12W as well as a front portion of the header body portion 12 up to the front guide roller 13 as a part of the header 11 after the diameter of the existing pipe 5 is increased. When the pipe 5 reaches the position immediately before the inlet of the drawing side end 6, it is attached to the drawing side end 6 of the existing pipe 5. In a state where the first jig 50 is attached to the pull-in side end 6 of the existing pipe 5, the first abutment surface 52a of the first abutment portion 52 has a pull-in side end as shown in FIGS. Of the end face 6a of the portion 6, on the axis line AX (see FIG. 1) extending in the axial direction L, it abuts with one portion 6Sa formed in an arc shape forming a part of a ring having a center, The other portion 6Sb that does not contact the contact portion 52 is disposed in the first jig cutout portion 53. A handle 54 is provided on the first jig 50.

  Next, the second jig 60 will be described. The second jig 60 includes a second abutting portion 62A and 62B that abuts on the end surface 6a of the drawing-side end portion 6 of the existing pipe 5, and a pulling force T1 of the wire W toward the reaching shaft 2 by the wire drawing device 20. Are transmitted to the existing pipe support means 40 via the second contact portions 62A and 62B. The second jig 60 is used when the existing pipe 5 is cut by the header 11.

  Drawing 11 is a figure showing the upper part division piece of the 2nd jig of the header recovery device concerning an embodiment, (a) is a front view and (b) is a side view. FIG. 12 is a view showing a lower divided piece of the second jig, wherein (a) is a front view and (b) a side view. FIG. 13 is an explanatory view showing a state in which the upper divided piece of the second jig and the lower divided piece of the second jig are connected. FIG. 14 is a diagram illustrating a range in which the second contact portion of the second jig is in contact with the end surface of the pull-in side end portion of the existing pipe.

  As shown in FIGS. 11 to 14, the second jig is divided into a plurality of pieces (two in this embodiment) in the direction along the circumferential direction C of the pull-in side end 6 of the existing pipe 5. It consists of a piece 61A and a lower divided piece 61B (divided piece), and the upper divided piece 61A and the lower divided piece 61B are detachably formed. First, the upper divided piece 61A will be described with reference to FIG.

  As shown in FIG. 11, the upper divided piece 61 </ b> A includes a plate-like second transmission portion 63 </ b> A formed in a substantially fan shape with a central angle of 180 degrees, and an inner edge portion slightly away from the inner peripheral surface to the radially outer side. And an upper divided piece cylinder portion 65 </ b> A having a substantially quarter-cylinder shape that is erected with a gap interposed therebetween. The second contact portion 62A is located on the inner diameter side of the two upper divided piece cylinder portions 65A in the second transmission portion 63A, and the second transmission portion 63A located on the inner diameter side of the upper divided piece cylinder portion 65A. The surface is the upper divided piece contact surface 62Aa. As shown in FIG. 14 to be referred to, the inner diameter of the upper divided piece cylinder portion 65A is substantially the same as the outer diameter of the drawing side end portion 6 of the existing pipe 5, and the upper divided piece cylinder portion 65A has a drawing side end. By wrapping the upper half of the portion 6, the upper divided piece 61 </ b> A can be attached to the drawing-side end portion 6.

  In the second transmission portion 63A, the second jig cutout portion 66 is located at a position with a center angle of 90 degrees, together with a gap between the two upper divided piece cylinder portions 65A, and a part of the second transmission portion 63A. Notched and formed. The second jig cutout portion 66 is formed when the leading portion of the header 11 (header main body portion 12) attempts to pass through the end surface 6a (tube opening) of the pull-in side end portion 6 of the existing pipe 5. The guide roller 13 has a size that does not interfere with the second transmission portion 63A (second jig 60) of the upper divided piece 61A.

In the second transmission portion 63A, engaging pieces 68 are disposed on both sides of the two upper divided piece cylinder portions 65A. As shown in FIG. 11, the engagement piece 68 is provided on one side in the longitudinal direction of the flat plate (upper side in FIG. 11A) so as to be rotatable around a shaft portion 67 </ b> A standing on the second transmission portion 63 </ b> A. The other side in the longitudinal direction (the lower side in FIG. 11A) is positioned away from the lower divided piece butting surface 61Bb, which is the end surface of the second transmission portion 63A. On the other side in the longitudinal direction of the engagement piece 68, an engagement groove 69 cut out inward from the long side of the engagement piece 68 is formed. A handle 64A is provided on the upper divided piece 61A at a center angle of 90 degrees.

  Next, the lower divided piece 61B will be described with reference to FIG. The lower divided piece 61B is a divided piece that forms a pair with the upper divided piece 61A. As shown in FIG. 12, the lower divided piece 61B has the same diameter as the second transmission portion 63A and a substantially fan-shaped plate with a central angle of 180 degrees. Second transmission part 63B having a shape, and two substantially quarter cylindrical lower divided piece cylinder parts 65B which are erected with a gap on the inner edge part slightly away from the inner peripheral surface to the outer diameter side, have. The second contact portion 62B is located on the inner diameter side of the two lower divided piece cylinder portions 65B in the second transmission portion 63B, and is located on the inner diameter side of the lower divided piece cylinder portion 65B. The surface of 63B is the lower divided piece contact surface 62Ba. The inner diameter of the lower divided piece cylinder portion 65B is substantially the same as the outer diameter of the drawing-side end portion 6 of the existing pipe 5, as shown in FIG. By wrapping the lower half of the pull-in side end portion 6 with the lower divided piece cylinder portion 65B, the lower divided piece tube portion 65B can be attached to the draw-side end portion 6. The lower divided piece 61B is provided with a handle 64B at a central angle of 90 degrees.

  The second transmission portion 63B is provided with pins 67B on both sides sandwiching the two lower divided piece cylinder portions 65B. The pin 67B is formed to be able to engage with the engaging groove 69 of the engaging piece 68 of the upper divided piece 61A. As shown in FIG. 13, the upper divided piece abutting surface 61Ab of the upper divided piece 61A and the lower divided piece abutting surface 61Bb of the lower divided piece 61B are opposed to each other, and the engaging groove 69 of the engaging piece 68 is engaged. When the pins 67B are engaged with each other, the upper divided piece 61A and the lower divided piece 61B are fixed and integrated as the second jig 60. As a result, the upper divided piece contact surface 62Aa and the lower divided piece contact surface 62Ba are formed in a sector shape in which the second jig notch 66 is missing from the annular surface on the same plane. A second jig penetration part 60 </ b> H connected to the two jig notch part 66 is formed at the center of the second jig 60.

  That is, the second contact portions 62A and 62B are formed in an annular shape that can secure the hollow portion 6S of the pull-in side end 6 corresponding to the diameter of the pull-in side end 6 of the existing pipe 5. As the second jig 60 expands the diameter of the existing pipe 5, as a part of the header 11, for example, in addition to the wire attachment portion 12 </ b> W, the leading portion of the header main body portion 12 around the front guide roller 13 is The second jig 60 is attached to the drawing-side end portion 6 of the existing pipe 5 up to a position close to the second contact portions 62A and 62B. In a state where the second jig 60 is attached to the drawing-side end portion 6 of the existing pipe 5, the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact of the second contact portion 62B. As shown in FIG. 14, the contact surface 62Ba is a part of an annular ring having a center on the most part of the end surface 6a of the pull-in side end portion 6 and the axis line AX extending in the direction along the axial direction L of the existing pipe 5. It touches in the shape of a circular arc.

  Next, the header collection method according to this embodiment will be described. The header recovery method according to the present embodiment is a series of replacement of the existing pipe 5 with the new pipe 5N by the pipe replacement device 10 and the header recovery device 30 described above in the replacement work to the new pipe 5N by the non-open gas pipe replacement method. It is performed after the execution of the diameter expansion preparation process described below.

  In the diameter expansion preparation step, first, after digging the starting shaft 1 and the reaching shaft 2, the existing pipe 5 is cut at the starting shaft 1 side, and the reaching shaft 2 side of the existing tube 5 is connected to the inner wall 2a of the reaching shaft 2 Cutting is performed at a more distant position, and the drawing-side end 6 of the existing pipe 5 is disposed in the reaching shaft 2. Next, the wire drawing device 20 and the header collecting device 30 are carried into the reaching shaft 2, and the header collecting device 30 is installed between the inner wall 2 a of the reaching shaft 2 and the wire drawing device 20. Next, in the reaching shaft 2, the wire W is inserted into the hollow portion 6S (see FIG. 14) in the pull-in side end 6 pipe from the pipe port of the pull-in side end 6 of the existing pipe 5, and the start end of the wire W (see FIG. 14). 1 is sent toward the start shaft 1 until it reaches the start shaft 1. On the other hand, the starting end portion of the wire W that has reached the start shaft 1 is connected to the tip end portion of the header 11 (the right end portion in FIG. 1). Further, the new pipe 5N is connected to the rear end portion (left end portion in FIG. 1) of the header 11. In the existing pipe 5 after cutting that connects the starting shaft 1 and the reaching shaft 2, a header 11 connecting the wire W and the new pipe 5N is installed at a position where the starting diameter of the starting shaft 1 is increased. deep.

  Next, the header collection method according to this embodiment will be described with reference to FIGS. 15 to 18. The header collection | recovery method which concerns on this embodiment has an existing pipe diameter expansion process, a jig | tool replacement | exchange process, and a header extraction process, and each process is implemented in this order.

  FIG. 15 is a first process diagram illustrating an existing pipe diameter increasing process of the header recovery method according to the embodiment. FIG. 16 is a second process diagram following FIG. 15, and is an explanatory diagram showing a state immediately before the end of the existing pipe diameter increasing process. FIG. 17 is a third process diagram subsequent to FIG. 16, and is an explanatory diagram showing a state in which the jig replacing process is performed. FIG. 18 is a fourth process diagram subsequent to FIG. 17, and is an explanatory diagram showing a state immediately after the header is pulled out from the pipe port at the pull-in side end in the header take-out process. 15 to 18, in order to make the drawings easier to see, in FIG. 5, from the center of the support portion 44 of the existing pipe support means 40 (vertical center in FIG. 5) to the back side (upper side in FIG. 5). It is illustrated from the viewpoint of seeing.

  First, the existing pipe diameter increasing process will be described with reference to FIGS. In the existing pipe diameter increasing step, as shown in FIGS. 13 to 15, the upper divided piece contact surface 62 </ b> Aa of the second contact portion 62 </ b> A that can contact the end surface 6 a of the pull-in side end portion 6 of the existing tube 5, and The second jig 60 (the upper divided piece 61A and the lower divided piece 61B) having the lower divided piece contact surface 62Ba of the second contact portion 62B is opposed to the end surface 6a of the drawing side end portion 6 of the existing pipe 5. Place it at the position you want. Then, as the header 11 is pulled, the existing pipe 5 that is about to move to the reaching shaft 2 side by the pulling force T1 acting on the existing shaft 2 acting on the existing tube 5 is divided into the upper side of the second contact portion 62A. The diameter of the existing pipe 5 is increased by the header 11 while supporting the piece contact surface 62Aa and the lower divided piece contact surface 62Ba of the second contact portion 62B in contact with the end surface 6a of the pull-in side end 6. To do. This existing pipe diameter increasing step is performed before the header taking out step.

  This will be specifically described. After the completion of the diameter expansion preparation process, the movement path of the guide roller 13 of the header 11 above the drawing-side end portion 6 of the existing pipe 5 by the operator holding the upper divided piece 61A grasped by the handle 64A in the reach shaft 2 The second jig notch 66 of the upper divided piece 61A is aligned and attached to the upper part. Further, the operator attaches the lower divided piece 61B grasped by the handle 64B below the pull-in side end portion 6 and engages the engaging groove 69 of the engaging piece 68 with the pin 67B, thereby dividing the upper divided piece 61B. The piece 61A and the lower divided piece 61B are fixed together. Accordingly, the upper divided piece contact surface 62Aa is disposed at a position facing the upper half of the end surface 6a of the pull-in side end portion 6, and the lower divided piece contact surface 62Ba is formed on the end surface 6a of the pull-in side end portion 6. It is arranged at a position facing the lower half.

  In the existing pipe diameter increasing step, the second jig 60 is disposed at a position facing the end surface 6a of the drawing-side end portion 6 of the existing pipe 5, and then the upper divided piece contact surface 62Aa of the second contact portion 62A. A circle having a center on the lower split piece contact surface 62Ba of the second contact portion 62B on the axis line AX extending in the direction along the axial direction L of the existing pipe 5 to the end surface 6a of the pull-in side end portion 6. It makes contact with an arc that forms part of the ring. Thereby, the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact surface 62Ba of the second contact portion 62B are brought into the drawing side of the existing pipe 5, as shown in FIG. Corresponding to the diameter of the end portion 6, the hollow portion 6 </ b> S of the pull-in side end portion 6 is formed in a ring shape that can be secured, and the wiring path of the wire W can be secured.

  Further, in the existing pipe diameter increasing step, when the header 11 is pulled by the wire W, the rods 43 are advanced and extended in advance with respect to the two cylinders 41 in the existing pipe support means 40. And the hollow part 6S of the existing pipe 5 is moved by pulling the wire W to the reaching shaft 2 side with the pulling force T1 (tensile force of several to several tens (t) in the present embodiment) by the wire drawing device 20. As a route, the header 11 is moved from the diameter expansion start position to the arrival shaft 2 side. By pulling the header 11, during the movement of the header 11, the two cutters 14 cut the existing pipe 5 along the axial direction L, and the enlarged diameter portion 15 is divided in the circumferential direction C by the cutter 14. The diameter of the tube 5 is expanded.

  At this time, as the header 11 is pulled, the existing pipe 5 tends to move toward the reaching shaft 2 with the pulling force T <b> 1 acting on the existing shaft 2 acting on the existing tube 5. In order to avoid this, as shown in FIG. 15, in the header recovery device 30, the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact surface 62Ba of the second contact portion 62B. Is brought into contact with the end surface 6a of the pull-in side end 6, and the upper divided piece support portion contact surface 61Aa of the upper divided piece 61A and the lower divided piece support portion contact surface 61Ba of the lower divided piece 61B are supported. The portion 44 is brought into contact with the support surface 44a. As a result, the diameter of the existing pipe 5 is increased by the header 11 while following the header 11 while supporting the existing pipe 5 that is caused to act on the support shaft 2 side by acting the reaction force T2 against the tensile force T1 on the support portion 44. Thus, the newly installed pipe 5N can be drawn into the inner peripheral side of the existing pipe 5 whose diameter has been expanded. The diameter of the existing pipe 5 by the header 11 is such that the leading end of the header main body 12 reaches the position at which the leading end of the existing pipe 5 disposed in the reaching shaft 2 substantially reaches the inlet of the existing pipe 5. 60.

  In the header 11, the cutter 14 and the enlarged diameter portion 15 cannot pass through the second jig through portion 60 </ b> H of the second jig 60. Therefore, for example, when the head portion of the header main body portion 12 including the wire attachment portion 12W has just come out from the tube port of the pull-in side end portion 6 of the existing tube 5, the operator can use the wire W Is stopped, and the expansion of the existing pipe 5 is interrupted. Thereafter, the rods 43 are retracted in advance with respect to the two cylinders 41 in the existing pipe support means 40. Thereby, the support surface 44a of the support part 44 in the existing pipe support means 40 is the upper split piece support part contact surface 61Aa of the upper split piece 61A in the second jig 60 and the lower split piece of the lower split piece 61B. Separated from the support portion contact surface 61Ba. After the separation, as shown in FIG. 16, the operator removes only the lower divided piece 61B of the second jig 60 (upper divided piece 61A and lower divided piece 61B) from the drawing-side end portion 6 of the existing pipe 5. Remove from.

  When the lower divided piece 61B is removed from the drawing-side end portion 6 of the existing pipe 5, the pulling of the wire W by the wire drawing device 20 is resumed. At this time, the support surface 44a of the support portion 44 and the upper split piece support portion contact surface 61Aa of the upper split piece 61A may be kept separated, but each rod 43 of the existing pipe support means 40 is advanced again, The support surface 44a of the support portion 44 may be brought into contact with the upper divided piece support portion contact surface 61Aa of the upper divided piece 61A.

  After removing the lower split piece 61B, the operator further moves the header 11 to the reach shaft 2 side, and the rear cutter 14 has just come out of the inlet port 6 of the existing pipe 5 to the outside. Immediately after that, the pulling of the wire W by the wire drawing device 20 is stopped again. The cutting operation of the existing pipe 5 is completed when the rear cutter 14 cuts the end surface 6a of the pull-in side end 6.

Next, a jig exchanging step is performed in which the second jig 60 is replaced with the first jig 50. Specifically, the operator separates the remaining lower division of the second jig 60 in a state in which the support surface 44a of the support portion 44 and the upper divided piece support portion contact surface 61Aa of the upper divided piece 61A are separated from each other. The piece 61B is removed from the drawing-side end portion 6 of the existing pipe 5. Thereafter, the operator grasps the first jig 50 with the handle 54, and the first jig so that the leading portion of the header main body 12 of the header 11 enters the first jig notch 53 of the first jig 50. The tool 50 is placed above the top of the header body 12. As shown in FIGS. 9 and 17 to be referred to, the first jig 50 has a surface on the handle 54 side (the first jig 50) so that the first jig 50 and the support portion 44 are substantially parallel to each other. The surface including the first abutting surface 52a) is placed on the leading end of the header main body 12 in a state where it abuts the end surface 6a of the drawing-side end 6 of the existing pipe 5. Then, each rod 43 of the existing pipe support means 40 is advanced again. Further, the pulling of the wire W by the wire drawing device 20 is resumed.

  Next, a header extraction step is performed. In the header take-out process, a new pipe that is drawn from the start shaft 1 to the header 11 that expands the diameter by cutting the existing pipe 5 buried in the ground between the start shaft 1 and the arrival shaft 2 in the axial direction L thereof. By pulling from the reach shaft 2 side while being connected to 5N, the new pipe 5N is drawn into the inner circumference 5a side of the existing pipe 5 whose diameter has been expanded, and then the header 11 that has entered the pull-in side end 6 of the existing pipe 5 Recover. And this header taking-out process is the 1st of the 1st contact part 52 which can contact | abut with the end surface 6a of the drawing-in side edge part 6 of the existing pipe 5 arrange | positioned in the reaching shaft 2 after diameter expansion of the existing pipe 5. A first jig 50 having a contact surface 52a and a first jig notch 53 through which the header 11 can pass is disposed at a position facing the end face 6a of the drawing-side end 6 of the existing pipe 5, and While supporting the existing pipe 5 in a state where the abutting surface 52a is in contact with the end face 6a, the header 11 is passed through the first jig cutout portion 53 from the inlet of the drawing-side end portion 6 of the existing pipe 5. Pull outside.

  In this header taking-out process, after the first jig 50 is arranged at a position facing the end surface 6a of the drawing-side end portion 6 of the existing pipe 5, the first contact surface 52a of the first contact portion 52 is shown in FIG. As shown in FIG. 10, the end surface 6 a of the pull-in side end portion 6 is in contact with one portion 6 Sa formed on the axis line AX extending in the axial direction L and formed in an arc shape forming a part of a ring having a center. At the same time, the first jig cutout portion 53 is arranged in alignment with the hollow portion 6S in the pipe of the pull-in side end portion 6 in addition to the other portion 6Sb that does not contact the first contact surface 52a.

  This will be specifically described. In the existing pipe after cutting, which is divided in the circumferential direction C by the cutter 14, in order to completely pull out the enlarged diameter portion 15 of the header 11 from the pipe opening of the drawing side end portion 6, the enlarged diameter portion 15 of the header 11 is rearward. Since the diameter is so large, the sliding resistance generated when the enlarged diameter portion 15 moves on the inner circumference 5a side of the existing pipe 5 after the enlarged diameter is considerably large. Therefore, the rods 43 of the existing pipe support means 40 are moved forward again so that the support surface 44 a of the support portion 44 comes into contact with the first contact surface 52 a of the first contact portion 52 of the first jig 50. After the contact, in this state, as shown in FIG. 28, the wire W is pulled again by the pulling force T1 that overcomes the sliding resistance by the wire pulling device 20, and the header 11 is pulled to the end of the existing pipe 5 on the pulling side. Pull toward the 6 port. At this time, a reaction force T2 against the tensile force T1 is applied by the support portion 44 to support the existing pipe 5 that is about to move to the reaching shaft 2 side, while the tip of the new pipe 5N reaches a predetermined position in the reaching shaft 2. Until then, the header 11 is pulled by the wire W, and the entire header 11 is pulled out from the pipe port of the drawing-side end portion 6 of the existing pipe 5.

  Next, the pulling of the wire W by the wire drawing device 20 is stopped, the rods 43 are contracted in advance against the two cylinders 41 in the existing pipe support means 40, and then the first jig 50 is removed. The connection between the wire attachment portion 12W of the header main body portion 12 of the header 11 and the start end portion of the wire W is released, and the new tube attachment portion 15N of the header main body portion 12 of the header 11 and the tip of the new tube 5N After releasing the connection, the header 11 is thus recovered from the existing pipe 5.

  The operation and effect of the header collection device 30 and the header collection method according to this embodiment having the above-described configuration will be described.

In the header collection method according to this embodiment,
(1) A new pipe 5N that is drawn from the start shaft 1 with a header 11 that expands the diameter by cutting the existing pipe 5 buried in the ground between the start shaft 1 and the arrival shaft 2 in the axial direction L; In the connected state, by pulling from the reach shaft 2 side, the new pipe 5N is drawn into the inner circumference 5a side of the existing pipe 5 whose diameter has been expanded, and then the header 11 that has entered the pull-in side end 6 of the existing pipe 5 is recovered. In the header collecting method, the first contact of the first contact portion 52 that can contact the end surface 6a of the pull-in side end portion 6 of the existing pipe 5 disposed in the reaching shaft 2 after cutting the existing pipe 5 at least. A first jig 50 having a surface 52a and a first jig cutout portion 53 through which the header 11 can pass is disposed at a position facing the end surface 6a of the drawing-side end portion 6 of the existing pipe 5, and the first contact In a state where the first contact surface 52a of the contact portion 52 is in contact with the end surface 6a. A header taking-out step of pulling out the header 11 from the tube port of the drawing-side end portion 6 of the existing pipe 5 through the first jig notch 53 while supporting the installation pipe 5. Therefore, in the header taking-out process, after the first jig 50 is attached, the header 11 is further pulled to the reaching shaft 2 side, so that the header 11 cuts the drawing-side end portion 6 of the existing pipe 5 after the cutting. It passes through the first jig notch 53 of the first jig 50 in the axial direction L, and is pulled out from the tube opening of the pull-in side end 6 of the existing pipe 5.

  At this time, as the header 11 is pulled, a tensile force T1 to the existing shaft 5 acts on the existing pipe 5 and the existing tube 5 tries to move to the reaching shaft 2 side. Since the first abutment surface 52a of the first abutment portion 52 is abutted against the end surface 6a of the pull-in side end portion 6 of the existing tube 5 to support the existing tube 5, the reaction force T2 due to this tensile force T1 is the first. The existing pipe 5 does not move to the reaching shaft 2 side by acting on the end surface 6a of the drawing-side end part 6 of the existing pipe 5 via the first contact surface 52a of the first contact part 52. Therefore, by pulling the header 11 to the reaching vertical shaft 2 side so that the header 11 passes through the first jig cutout portion 53 of the first jig 50, the header 11 is removed from the drawing-side end portion 6 of the existing pipe 5. It can be pulled out and collected.

  Moreover, in the header collection method according to the present embodiment, unlike the prior art, when the header 11 is removed from the drawing-side end 6 of the existing pipe 5 and collected, the drawing-side end of the existing pipe in which the header enters the pipe is used. The work of cutting from the existing pipe main body or the work of releasing the connection between the auxiliary pipe containing the header and the existing pipe after connecting the auxiliary pipe to the existing pipe is completely unnecessary. In addition, the operator can easily recover the header 11 simply by placing the first jig 50 at the pull-in side end 6 of the existing pipe 5 and continuously pulling the header 11 toward the reaching shaft 2 side. The collection work of the header 11 can be performed more efficiently than the conventional collection work.

  Further, the operator simply places the first jig 50 on the end surface 6 a of the pull-in side end 6 of the existing pipe 5 and pulls the header 11. Since it can be taken out from 6 and collected, the header can be collected safely without any danger to the operator. Also, the operator can lift the header 11 collected from the existing pipe 1 in the reach shaft 2 to the ground GL by lifting the header 11 alone to the ground, The header that has entered the pipe together with the end of the existing pipe on the drawing side is smaller than the conventional technique in which the header is carried out from the reach shaft to the ground. In addition, when the header 11 is collected, the existing pipe is not hit with a tool such as a hammer as in the prior art, and the header 11 is not damaged due to the impact of the tool.

  Therefore, after the diameter of the existing pipe 5 is increased, the header 11 can be safely and efficiently taken out from the pipe port of the drawing-side end portion 6 of the existing pipe 5 and recovered.

(2) In the header collection method described in (1), the upper divided piece abutment of the second abutment portion 62A that can abut against the end surface 6a of the draw-in side end portion 6 of the existing pipe 5 before the header taking-out step. The second jig 60 having the surface 62Aa and the lower divided piece contact surface 62Ba of the second contact portion 62B is disposed at a position facing the end surface 6a of the pull-in side end portion 6 of the existing pipe 5, and the header 11 With the pulling, the existing pipe 5 to be moved to the reaching vertical shaft 2 side with the pulling force T1 acting on the existing vertical shaft 2 acting on the existing pipe 5 is attached to the end surface 6a of the upper abutment piece 62A of the second contact portion 62A. An existing pipe diameter increasing step for expanding the existing pipe 5 by the header 11 while supporting the contact surface 62Aa and the lower divided piece contact surface 62Ba of the second contact portion 62B in contact with each other; A jig exchanging step of replacing the jig 60 with the first jig 50. Therefore, the diameter expansion operation of the existing pipe 5 in the existing pipe diameter increasing process is performed, for example, several to several tens (t) by the wire W wound around the wire winding drum 28 as in the present embodiment. ) While pulling the header 11 to the reach shaft 2 side with a large force T 1, while cutting the existing pipe 5 in the axial direction L with the cutter 14 of the header 11, the existing pipe 5 is cut with the enlarged diameter portion 15 of the header 11. 5, the sliding resistance of the header 11 when moving in the pipe (hollow part 6S) of the existing pipe 5 is very large.

  Therefore, when the header 11 is pulled with such a large force T1, the pulling force T1 of the existing pipe 5 that causes the existing pipe 5 itself to move toward the reaching shaft 2 acts as the header 11 is pulled. At this time, the second jig 60 is attached to the drawing-side end portion 6 of the existing pipe 5, and the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact of the second contact portion 62B. The contact surface 62Ba is brought into contact with the end surface 6a of the pull-in side end portion 6 of the existing pipe 5 to support the existing pipe 5, whereby a reaction force T2 with respect to the tensile force T1 of the existing pipe 5 that is about to move to the reaching shaft 2 side. By making it act on the end surface 6a of the drawing side end portion 6 of the existing pipe 5, the existing pipe 5 can be held without moving during the diameter expansion operation. Therefore, when the existing pipe 5 is expanded, by pulling the header 11 with the wire W while the existing pipe 5 is fixed, as illustrated, a large force T1 (tensile of the header 11) of several to several tens (t) The force T1) is transmitted to the header 11 in the existing pipe 5 without loss, and the existing pipe 5 can be efficiently cut and expanded in diameter.

  Further, in the existing pipe diameter increasing step, the existing pipe 5 is supported by using the second jig 60 and the header 11 is pulled to cut the existing pipe 5 and expand the diameter. When the header 11 is pulled as it is, the header 11 and the second jig 60 interfere with each other, and the header 11 causes the second jig 60 to move. It cannot pass through and cannot be pulled out from the pipe opening of the pull-in side end 6 of the existing pipe 5. Then, after performing the jig | tool exchange process and exchanging the 2nd jig | tool 60 for the 1st jig | tool 50, as mentioned above, the header 11 is pulled by the 1st jig | tool by pulling the header 11 to the arrival shaft 2 side. 50 first jig cutouts 53 can be passed through and pulled out from the pull-in side end 6 of the existing pipe 5 to be recovered.

(3) In the header collection method described in (2), the side divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact surface 62Ba of the second contact portion 62B are provided on the existing pipe 5 The hollow portion 6S of the pull-in side end 6 is formed in an annular shape corresponding to the diameter of the pull-in side end 6 and the second jig 60 is pulled into the pull-in side of the existing pipe 5 in the existing pipe diameter increasing step. After being arranged at a position facing the end surface 6a of the end portion 6, the side split piece contact surface 62Aa of the second contact portion 62A and the lower split piece contact surface 62Ba of the second contact portion 62B are placed on the drawing side. Since the end surface 6a of the end portion 6 is brought into contact with an axis AX extending in a direction along the axial direction L of the existing pipe 5 in an arc shape forming a part of a ring having a center, The wire W wound around the take-up drum 28 is connected to the header 11 in the pipe of the existing pipe 5 and the second contact portion 62A. Even though the second jig 60 can be connected through the second jig penetrating portion 60H in the ring of 62B, and the second jig 60 is attached to the pull-in side end portion 6 of the existing pipe 5, the header 11 is moved to the reaching shaft 2 side by the wire W. Can be pulled.

  Moreover, in this embodiment, as illustrated, the header 11 is pulled with a large force T1 of several to several tens (t), and the reaction force T2 of the tensile force T1 applied to the existing pipe 5 is the arc-shaped second contact. It acts on the end surface 6a of the drawing-side end portion 6 of the annular existing pipe 5 via the side division piece contact surface 62Aa of the portion 62A and the lower division piece contact surface 62Ba of the second contact portion 62B. When the reaction force T2 at this time acts along the axial direction L start shaft 1 side of the existing pipe 5, the existing pipe 5 can be held without being tilted and kept moving without being moved. When the header 11 is pulled straight in the axial direction L toward the axial direction L starting vertical shaft 2 side opposite to the axial direction L starting vertical shaft 1 side, the header 11 is within the pipe of the existing pipe 5 and the inner wall of the existing pipe 5 It can move smoothly without hitting the (inner peripheral surface 5a) locally. Therefore, when the header 11 is pulled into the pipe of the existing pipe 5 by the wire W, the load applied to the wire pulling device 20 when the wire W is pulled is further reduced, and the existing pipe 5 is cut in the axial direction L. The cut portion can be expanded in the circumferential direction C of the tube by the expanded diameter portion 15.

(4) In the header recovery method described in any one of (1) to (3), a position where the first jig 50 faces the end surface 6a of the drawing-side end portion 6 of the existing pipe 5 in the header extraction step. After the first contact surface 52a of the first contact portion 52 is arranged on the axis AX extending in the axial direction L of the end surface 6a of the pull-in side end portion 6, a part of the ring having the center The first jig notch 53 is disposed in alignment with the hollow portion 6S in the pipe of the pull-in side end 6 while being brought into contact with one portion 6Sa formed in an arc shape forming Therefore, the first jig 50 is connected to the end face 6 of the existing pipe 5 in the state where the first contact face 52 a of the first contact part 52 is in contact with the end face 6 a of the pull-in side end 6. If it is arranged at a position facing 6a, the header 11 can be The existing pipe 5 can be supported by the jig 50 so that the existing pipe 5 does not move, and the cutter 14 of the header 11 is passed through the first jig notch 53 of the first jig 50, The drawing-side end portion 6 of the existing pipe 5 is cut in the axial direction L and the diameter thereof is expanded, and the header 11 can be easily taken out from the pipe port of the drawing-side end portion 6 of the existing pipe 5.

In the header collection device 30 according to the present embodiment,
(5) It has the header 11 which cuts the existing pipe 5 embed | buried under the ground between the starting shaft 1 and the arrival shaft 2 in the axial direction L, and expands the diameter, The header 11 is taken from the starting shaft 1 Used in conjunction with the pipe replacement device 10 for pulling the new pipe 5N into the inner circumference 5a side of the existing pipe 5 whose diameter has been expanded by pulling from the reach shaft 1 side while being connected to the new pipe 5N to be pulled. Along with this, the existing pipe support means 40 that supports the existing pipe 5 that is going to move to the reaching shaft 2 side with the pulling force T <b> 1 acting on the reaching shaft 2 acting on the existing pipe 5, and the existing equipment that is arranged in the reaching shaft 2 The first abutment surface 52a of the first abutment portion 52 that abuts the end surface 6a of the pull-in side end portion 6 of the pipe 5 and the pulling force T1 toward the reaching shaft 2 side are passed through the first abutment portion 52. A first transmission part 51 for transmission to the existing pipe support means 40 and the header 1 And the first jig notch 53 formed so as to be able to pass through, and the first jig 50 used after the diameter expansion of the existing pipe 5 is provided. Therefore, the header according to this embodiment The recovery device 30 is installed in the reaching shaft 2, and immediately before the header 11 moves from the starting shaft 1 toward the reaching shaft 2, and the diameter of the existing pipe 5 buried in the ground is finished, When the leading end of the header 11 reaches the pull-in side end 6 of the existing pipe 5 located in the reaching shaft 2, the first jig 50 is connected to the pull-in end 6 of the existing pipe 5 at its end face. It is attached in a state where one portion 6Sa of 6a and the first contact surface 52a of the first contact portion 52 are in contact with each other.

  After the first jig 50 is attached, the header 11 is further pulled toward the shaft 2 by the pipe changing device 10, so that the header 11 pulls the pull-in side end 6 of the existing pipe 5 in the axial direction L. 50 passes through the first jig cutout portion 53 and is pulled out from the tube opening of the pull-in side end portion 6 of the existing pipe 5. At this time, as the header 11 is pulled, the existing pipe 5 is subjected to a pulling force T1 toward the reaching shaft 2 and the existing tube 5 tries to move to the reaching shaft 2 side. The reaction force T <b> 2 acts on the end surface 6 a of the drawing-side end portion 6 of the existing pipe 5 from the existing pipe support means 40 via the first transmission portion 51 and the first contact surface 52 a of the first contact portion 52. Therefore, the existing pipe 5 does not move to the reaching shaft 2 side. Therefore, by pulling the header 11 to the arrival shaft 2 side with the wire drawing device 20 of the pipe changing device 10 so that the header 11 passes through the first jig notch 53 of the first jig 50, the header 11 is The existing pipe 5 can be recovered by being pulled out from the pipe opening of the drawing-side end portion 6 of the existing pipe 5.

  Moreover, in the header collection | recovery apparatus 30 which concerns on this embodiment, when taking out and collect | recovering the header 11 from the drawing-in side edge part 6 of the existing pipe 5, unlike the prior art, the drawing-in side edge part of the existing pipe into which the header entered There is absolutely no need to disconnect the existing pipe from the existing pipe main body or to connect the auxiliary pipe with the existing pipe and then to release the connection between the auxiliary pipe containing the header and the existing pipe. In addition, the operator simply places the first jig 50 on the drawing-side end 6 of the existing pipe 5 and continuously pulls the header 11 to the arrival shaft 2 side by the wire drawing-in device 20 of the pipe changing device 10. 11 can be easily recovered, and the recovery operation of the header 11 can be performed more efficiently than the conventional recovery operation. Further, the header 11 can be collected even if the ground GL of the replacement work section from the existing pipe 5 to the new pipe 5N is flat or inclined.

  Further, the operator simply places the first jig 50 on the end surface 6a of the pull-in side end 6 of the existing pipe 5 and pulls the header 11 with the pipe changing device 10 so that the header 11 is attached to the existing pipe 5. 5, the header 11 can be safely recovered without any danger to the operator. In addition, the operator can lift the header 11 collected from the existing pipe 5 in the reach shaft 2 to the ground GL by lifting the header 11 alone to the ground, The header that has entered the pipe together with the end of the existing pipe on the drawing side is smaller than the conventional technique in which the header is carried out from the reach shaft to the ground. In addition, when the header 11 is collected, the existing pipe is not hit with a tool such as a hammer as in the prior art, and the header 11 is not damaged due to the impact of the tool.

  Therefore, after the diameter of the existing pipe 5 is increased, the header 11 can be safely and efficiently taken out from the pipe port of the drawing-side end portion 6 of the existing pipe 5 and recovered.

(6) In the header recovery apparatus 30 described in (5), the first jig 50 is disposed at a position facing the end surface 6 a of the drawing-side end 6 of the existing pipe 5, and One abutment surface 52a is in contact with one portion 6Sa formed in an arc shape forming a part of an annular ring having a center on an axis AX extending in the axial direction L of the end surface 6a of the pull-in side end 6. The first jig notch 53 is in contact with the hollow portion 6S in the pipe of the pull-in side end 6 and is arranged so as to be aligned with the hollow shaft 6S. The wire W wound around the wire take-up drum 28 installed in the vicinity of is inserted into the start shaft 1 from the arrival shaft 2, and the header 11 connected to the wire W is connected to the arrival shaft 2 at the time of diameter expansion. In the case of the pipe changing device 10 that expands the existing pipe 5 by pulling to the side Even when the wire W is inserted through the existing pipe 5 (hollow portion 6S), the wiring path of the wire W is arranged in the first jig cutout portion 53, so that the first jig 50 can be attached to the pull-in side end 6 of the existing pipe 5.

  By the way, the header 11 includes a guide roller 13 that guides the header body 12 in the traveling direction along the inner peripheral surface 5 a of the existing pipe 5, a cutter 14 that cuts the existing pipe 5 in the axial direction L, and a cutter 14. The divided existing pipe 5 has a frustoconical diameter-enlarged portion 15 that expands the diameter in the circumferential direction C thereof. In the header 11, when the diameter is expanded, the cutter 14 and the diameter-enlarged portion 15 move along the movement path from the outer circumference of the existing pipe 5 to the outside of the existing pipe 5 due to its function.

  In the header collection device 30 according to the present embodiment, the first contact surface 52a of the first contact portion 52 of the first jig 50 is the end surface 6a of the drawing-side end portion 6 of the existing pipe 5 that is embedded. The existing pipe 5 is supported by the existing pipe support means 40 via the first transmission portion 51 in contact with the one portion 6Sa formed in an arc shape. As a result, the existing pipe 5 is held, and in this state, when the header 11 is pulled by the wire W from the reach shaft 2 side, the cutter 14 having a moving path on the outer diameter side from the outer periphery of the existing pipe 5 and In addition to the enlarged diameter portion 15, the guide roller 13 and the like can move and pass toward the first jig cutout portion 53. Therefore, the header 11 can be pulled out from the pipe port of the drawing-side end portion 6 of the existing pipe 5 without interfering with the first jig 50.

(7) In the header recovery device 30 described in (5) or (6), the upper divided piece contact surface 62Aa of the second contact portion 62A that contacts the end surface 6a of the pull-in side end portion 6 of the existing pipe 5; The second split part contact surface 62Ba of the second contact part 62B and the tensile force T1 toward the reaching shaft 2 side are transmitted to the existing pipe support means 40 via the second contact parts 62A and 62B. Since it has a transmission part 63A, 63B and is provided with the 2nd jig | tool 60 used when the existing pipe 5 is expanded in diameter by the header 11, the diameter expansion operation | work of the existing pipe 5 is carried out in this implementation. As in the embodiment, for example, while pulling the header 11 to the arrival shaft 2 side with a large force T1 of several to several tens (t) by the wire W described above, the existing pipe 5 is moved in the axial direction L by the cutter 14 of the header 11. While cutting, around the existing pipe 5 with the enlarged diameter portion 15 at the cut portion To spread and C, the sliding resistance of the header 11 when moving the tube of the existing pipe 5 (hollow portion 6S) is very large.

  Therefore, when the header 11 is pulled with such a large force T1, the pulling force T1 of the existing pipe 5 that causes the existing pipe 5 itself to move toward the reaching shaft 2 acts greatly as the header 11 is pulled. At this time, the second jig 60 is attached to the drawing-side end portion 6 of the existing pipe 5 so that the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower split of the second contact portion 62B. The piece abutment surface 62Ba comes into contact with the end surface 6a of the pull-in side end 6 of the existing pipe 5, and the tensile force T1 of the existing pipe 5 trying to move to the reaching shaft 2 side causes the upper divided piece of the second transmission portion 63A to move. It acts on the support surface 44a of the support portion 44 of the existing pipe support means 40 via the support portion contact surface 61Aa and the lower divided piece support portion contact surface 61Ba of the second transmission portion 63B. The existing pipe support means 40 causes the reaction force T2 of the tensile force T1 to act toward the end surface 6a of the pull-in side end portion 6 of the existing pipe 5, so that the existing pipe 5 is held without moving during the diameter expansion operation. Can be in a state. Therefore, when the diameter of the existing pipe 5 is increased, the header 11 is pulled with the wire W while the existing pipe 5 is fixed. As illustrated, a large force of several to several tens (t) (the tensile force of the header 11) T1) is transmitted to the header 11 in the existing pipe 5 without loss, and the existing pipe 5 can be efficiently cut and expanded in diameter.

(8) In the header collection device 30 described in (7), the second contact portions 62A and 62B can secure the hollow portion 6S in the pipe at the end of the existing pipe 5 corresponding to the diameter of the existing pipe 5. The second jig 60 is formed in an annular shape, and is disposed at a position facing the end surface 6a of the drawing-side end portion 6 of the existing pipe 5, and the upper divided piece contact surface 62Aa of the second contact portion 62A. The lower divided piece abutment surface 62Ba of the second abutment portion 62B has a center on the end surface 6a of the draw-in side end portion 6 and the axis AX extending in the direction along the axial direction L of the existing pipe 5. The wire W wound around the wire take-up drum 28 is connected to the header 11 in the pipe of the existing pipe 5 and the second abutting parts 62A and 62B. The second jig 60 can be connected to the existing pipe 5 through the second jig penetration part 60H in the ring. Be attached to the viewed side end portion 6, the wire lead-in devices 20 the header wire W can be pulled arrival pit 2 side.

  Further, as exemplified above, the header 11 is pulled with a large force T1 of several to several tens (t), and the reaction force T2 of the tensile force T1 applied to the existing pipe 5 is reduced by the arc-shaped second contact portion 62A. It acts on the end surface 6a of the drawing-side end portion 6 of the annular existing pipe 5 via the upper divided piece contact surface 62Aa and the lower divided piece contact surface 62Ba of the second contact portion 62B. When the reaction force T2 at this time acts along the axial direction L start shaft 1 side of the existing pipe 5, the existing pipe 5 can be held without moving without being inclined while being buried in the ground. Therefore, when the header 11 is pulled straight in the axial direction L toward the axial direction L reaching vertical shaft 2 side that is opposite to the axial direction L start shaft 1 side, the header 11 is placed inside the existing pipe 5 in the existing pipe 5. It can move smoothly without hitting the inner wall (inner peripheral surface 5a) locally. Therefore, when the header 11 is pulled into the pipe of the existing pipe 5 by the wire W, the load applied to the wire drawing device 20 when the wire W is pulled is further suppressed, and the existing pipe 5 is cut in the axial direction L. The cut portion can be expanded in the circumferential direction C of the tube by the expanded diameter portion 15.

(9) In the header recovery device 30 described in any one of (5) to (8), the existing pipe support means 40 is provided with a tensile force T1 transmitted from the first jig 50 or the second jig 60. It has a support part 44 for applying a reaction force T2, and the support part 44 is formed so as to be movable in the direction along the axial direction L of the existing pipe 5, so that the existing pipe 5 is expanded. When the second jig 60 is attached to the pull-in side end portion 6 of the existing pipe 5 located in the reach shaft 2, or after the diameter of the existing pipe 5 is increased, the second jig 60 is removed and the second jig When the first jig 50 is attached to the drawing-side end portion 6 of the existing pipe 5 instead of the tool 60, the support portion 44 of the existing pipe support means 40 is separated from the drawing-side end portion 6 of the existing pipe 5. The operator moves the first jig 50 and the second jig 60 into the existing pipe 5. When attaching and detaching the end 6, easily its work.

  On the other hand, the first jig 50 is brought into contact with the end 6 of the existing tube 5 by bringing the first contact surface 52 a of the first contact 52 into contact with the end surface 6 a of the end 6 of the existing tube 5. When attached, the support portion 44 is moved in a direction close to the pull-in side end portion 6 of the existing pipe 5, and the support surface 44 a of the support portion 44 of the existing pipe support means 40 and the first contact portion of the first jig 50. The first contact surface 52a of 52 is brought into contact. Thereby, the reaction force T2 of the tensile force T1 acting on the existing pipe 5 is changed from the support surface 44a of the support portion 44 of the existing pipe support means 40 to the first transmission portion 51 and the first contact portion 52 of the first jig 50. The first abutment surface 52 a acts on the end surface 6 a of the pull-in side end portion 6 of the existing pipe 5.

  Further, the upper divided piece contact surface 62Aa of the second contact portion 62A and the lower divided piece contact surface 62Ba of the second contact portion 62B are brought into contact with the end surface 6a of the drawing side end portion 6 of the existing pipe 5. When the second jig 60 is attached to the drawing-side end portion 6 of the existing pipe 5, the support portion 44 is moved in a direction close to the drawing-side end portion 6 of the existing pipe 5 to support the existing pipe support means 40. 44, and in the second jig 60, the upper divided piece support portion contact surface 61Aa of the second transmission portion 63A and the lower divided piece support portion contact surface 61Ba of the second transmission portion 63B. Make contact. As a result, the reaction force T2 of the tensile force T1 acting on the existing pipe 5 is changed from the support part 44 of the existing pipe support means 40 to the second transmission parts 63A and 63B and the second contact parts 62A and 62B of the second jig 60. It acts on the end surface 6a of the drawing-in side end portion 6 of the existing pipe 5 via the.

(10) In the header recovery device 30 described in (9), the existing pipe support means 40 is a hydraulic drive source having a rod 43 that can be expanded and contracted with respect to the fixed cylinder 41, and the support portion 44 is a rod. Since it is provided at the tip of 43, the existing pipe support means 40 should be configured in a space-saving manner to stably support the existing pipe 5 to be moved to the reaching shaft 2 side with a large force. The existing pipe support means 40 that can be made compact can be installed also in the reaching shaft 2 in which the space is narrow. Further, for example, when the position of the support portion 44 is to be changed when the first jig 50 or the second jig 60 is attached or detached, the rod 43 can be freely expanded and contracted by a simple operation. The workability when changing the position of is improved.

(11) In the header recovery device 30 described in any one of (5) to (10), the first jig 50 is formed of a flat plate, and the first contact portion 52 is one of the first transmission portions 51. And the first jig notch 53 is formed by being cut out inward of the first contact portion 52 in the radial direction. Can be formed inexpensively by machining one flat plate. Further, for example, in the state where the first contact portion 52 is in contact with the end surface 6 a of the pull-in side end portion 6 of the existing pipe 5 and is in contact with the existing pipe 5, the existing pipe is supported on the axial L start shaft 1 side of the existing pipe 5. By pressing the support portion 44 of the means 40 against the first transmission portion 51, the first jig 50 can be fixed and easily attached to the drawing-side end portion 6 of the existing pipe 5.

  Further, the first contact portion 52 of the first jig 50 is placed in contact with the end surface 6 a of the pull-in side end portion 6 of the existing pipe 5 and brought into contact with the first contact portion 52 of the existing pipe 5. By simply fixing to the pull-in side end 6, the header 11 passes through the first jig notch 53 that communicates with the hollow portion 6S in the pipe of the pull-in side end 6 of the existing pipe 5 as its passage path. 5 can be easily moved to the outside from the pipe opening of the drawing-side end 6.

(12) In the header recovery device 30 described in any one of (7) to (11), the second jig 60 is divided into two parts in the direction along the circumferential direction C of the existing pipe 5. Since the upper divided piece 61A and the lower divided piece 61B are composed of the upper divided piece 61A and the lower divided piece 61B that are detachable and integrally formed, as in the present embodiment, for example, In the case of the second jig 60 in which the upper divided piece 61A and the lower divided piece 61B are abutted and connected to each other in the upper and lower sides sandwiching the pull-in side end portion 6 of the existing pipe 5 in the divided piece obtained by dividing the ring When the person attaches the second jig 60 to the pull-in side end 6 of the existing pipe 5 in the reaching shaft 2, first, the upper half upper split piece 61A is placed on the pull-in side end 6 of the existing pipe 5, The lower half is connected to the lower divided piece 61B. Thereby, when an operator enters the reach shaft 2 and attaches the second jig 60 to the drawing side end 6 of the existing pipe 5, it is not necessary to lift the entire second jig 60 at a time. 2 The weight of the entire jig 60 can be shared and attached to the pull-in side end 6 of the existing pipe 5, and the work burden (labor) applied to the operator can be reduced within the narrow reach shaft 2.

  As described above, the header 11 includes the guide roller 13 that guides the header main body 12 in the traveling direction along the inner peripheral surface 5a of the existing pipe 5, and the cutter 14 that cuts the existing pipe 5 in the axial direction L thereof. And a frustum-shaped enlarged diameter portion 15 for expanding the diameter of the existing pipe 5 divided by the cutter 14 in the circumferential direction C. In such a header 11, a plurality of guide rollers 13 (three in this embodiment) are arranged from the front end to the rear end of the header 11, the enlarged diameter portion 15 is arranged at the rear end of the header 11, and the cutter 14 is enlarged in diameter. It is arranged on the tip side from the portion 15. In the case of the second jig 60 in which the upper divided piece 61 </ b> A and the lower divided piece 61 </ b> B are brought into contact with each other on the upper and lower sides of the existing pipe 5, the leading end of the header 11 is on the drawing side of the existing pipe 5 in the reaching shaft 2. Since the cutter 14 may come into contact with the second jig 60 when approaching the tube opening of the end portion 6, for example, the lower divided piece of the lower half of the second jig 60 that intersects the movement path of the cutter 14. Only 61B is removed, and the contact between the lower divided piece 61B and the cutter 14 is prevented. On the other hand, when the header 11 continues to be pulled to the reaching shaft 2 side until the header 11 comes out from the pipe port of the pull-in side end portion 6 of the existing pipe 5, the reaction force T2 against the tensile force T1 of the header 11 is The movement of the existing pipe 5 can be prevented by acting on the upper divided piece 61 </ b> A of the upper half of the second jig 60.

In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described embodiments, and can be appropriately modified and applied without departing from the gist thereof.
For example, in the embodiment, the second jig 60 is configured by two divisions of the upper divided piece 61A and the lower divided piece 61B. However, the second jig 60 is, for example, a single piece or divided pieces to be divided. The quantity of can be changed as appropriate.

1 Starting shaft 2 Reaching shaft 5 Existing pipe 5N New pipe 6 Pull-in side end (end)
6a End face 6S Hollow part 6Sa One part 10 Pipe replacement device 11 Header 30 Header collection device 40 Existing pipe support means 41 Cylinder 43 Rod 44 Support part 50 First jig 51 First transmission part 52 First contact part 53 First Jig notch (notch)
60 Second jig 61A Upper divided piece (divided piece)
61B Lower split piece (split piece)
62A, 62B 2nd contact part 63A, 63B 2nd transmission part L Axial direction C Circumferential direction T1 Tensile force T2 Reaction force AX Axis line

Claims (7)

A state in which the existing pipe embedded in the ground between the start shaft and the arrival shaft is cut in the axial direction to expand the diameter, and the header is connected to a new pipe drawn from the start shaft Then, by pulling from the reach shaft side, it is used together with a pipe replacement device that draws the new pipe into the inner peripheral side of the existing pipe that has been expanded in diameter,
With the pulling of the header, the existing pipe support means for supporting the existing pipe that is going to move to the reaching shaft side with the pulling force acting on the existing shaft side acting on the existing pipe,
A first abutting portion that abuts on an end surface of the end portion of the existing pipe disposed in the reaching shaft, and the tensile force toward the reaching shaft side is passed through the first abutting portion to the existing pipe. A first treatment used for pulling out the header from the existing pipe after the diameter expansion has a first transmission part to be transmitted to the support means and a notch part or an opening part formed so that the header can pass through. and immediately, the header recovery device Ru provided with,
The existing pipe support means has a support part that applies a reaction force of the tensile force transmitted from the first jig, and the support part moves in a direction along the axial direction of the existing pipe. Being made possible,
The existing pipe support means includes a hydraulic drive source having a rod that can be expanded and contracted with respect to a fixed cylinder, and the support portion is provided at a tip of the rod;
The hydraulic drive source is configured to be able to exert a driving force for supporting the support portion so that the reaction force of the tensile force transmitted from the first jig acts on the existing pipe from the support portion. That
A header recovery device. In the header collection | recovery apparatus described in Claim 1 ,
The first jig is arranged at a position facing the end surface of the end portion of the existing pipe, and the first contact portion is centered on an axis extending in the axial direction among the end surfaces of the end portion. A notch or the opening is aligned with a hollow portion in the pipe at the end, and is in contact with one portion formed in an arc shape that forms a part of a ring having
A header recovery device. In the header collection | recovery apparatus described in Claim 1 or Claim 2 ,
A second abutting portion that abuts on the end surface of the end portion of the existing pipe, and a second that transmits the tensile force toward the reach shaft to the existing pipe supporting means via the second abutting portion. A second jig used for expanding the diameter of the existing pipe with the header,
A header recovery device. In the header collection | recovery apparatus described in Claim 3,
A reaction force of the tensile force transmitted from the second jig is received by the support portion of the existing pipe support means;
The hydraulic drive source is configured to be able to exert a driving force for supporting the support portion so that the reaction force of the tensile force transmitted from the second jig is applied from the support portion to the existing pipe. That
A header recovery device. In the header collection | recovery apparatus described in Claim 3 or Claim 4 ,
The second abutting portion is formed in an annular shape corresponding to the diameter of the existing tube so as to ensure a hollow portion in the tube at the end,
The second jig is disposed at a position facing the end surface of the end portion of the existing pipe, and the second contact portion is in a direction along the end surface of the end portion and the axial direction of the existing pipe. Abutting on the extending axis, in the shape of a circular arc or part of a ring having a center,
A header recovery device. In the header collection | recovery apparatus as described in any one of Claims 1 thru | or 5 ,
The first jig is formed of a flat plate, the first contact portion is disposed as a part of the first transmission portion, and the notch portion is a radial diameter of the first contact portion. Being cut out on the inside,
A header recovery device. In the header collection | recovery apparatus as described in any one of Claim 3 thru | or 5 ,
The second jig is composed of a plurality of divided pieces with respect to the direction along the circumferential direction of the existing pipe, and the plurality of divided pieces are detachable and integrally formed.
A header recovery device.

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