JP5823891B2 - Header collection device - Google Patents

Header collection device Download PDF

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JP5823891B2
JP5823891B2 JP2012044467A JP2012044467A JP5823891B2 JP 5823891 B2 JP5823891 B2 JP 5823891B2 JP 2012044467 A JP2012044467 A JP 2012044467A JP 2012044467 A JP2012044467 A JP 2012044467A JP 5823891 B2 JP5823891 B2 JP 5823891B2
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existing pipe
header
jig
pipe
existing
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JP2013181294A (en
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一弘 細野
一弘 細野
幹晋 竹内
幹晋 竹内
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Toho Gas Co Ltd
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Description

この発明は、新設管と接続したヘッダを引っ張ることにより、地中に埋設されている鋼管等の既設管をその軸方向に切断、拡径し、拡径した既設管の中に新設管を引き込んだ後、既設管の引き込み側端部の管内に入り込んだヘッダを回収するヘッダ回収方法及びヘッダ回収装置に関するものである。   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.

地中には、例えば、燃料ガスを送るガス導管、上水を流す水道管等、多くの導管が埋設されている。従来、ガス導管には、継手で接続して形成される鋼管や鋳鉄管等の管が一般的に用いられてきた。これらの管が古くなると、地震等の大きな外力が加わった際に、ダメージを受ける虞がある。そのため、古くなった管を、ポリエチレン（ＰＥ）管等、より可撓性を有した材質の新設管に、更新することが進められている。   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.

新設管への入替え工事にあたり、既設管が埋設されている区間全体を掘り返したのでは、工事は大がかりで、工事期間も長く、周辺の交通事情への影響が大きくなる。そこで、最近、例えば、特許文献１の既設埋設管の回収方法のように、既設管と新設管との入替を掘削しないで行う非開削ガス管入替工法が採用されている。図１９は、特許文献１に係る既設埋設管の回収方法を示す前工程図であり、図２０は、図１９に続く後工程図である。   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.

特許文献１は、図１９に示すように、切断ヘッド１０９を取り付けたワイヤロープ１０５を、発進立坑１０３ａ側から埋設管１０１内に挿通して到達立坑１０３ｂ側から引張り、埋設管１０１を切断して拡径する。この後、図２０に示すように、切断ヘッド１０９を外し、ワイヤロープ１０５と埋設管１０１とを接続すると共に、発進立坑１０３ａ側でワイヤロープ１０５の後端に新管１０７を連結させ、引き続きワイヤロープ１０５を、到達立坑１０３ｂ側から引き込んで埋設管１０１と新管１０７とを入れ替える。   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.

また、特許文献は挙げていないが、特許文献１のほかにも、ヘッダ（切断ヘッド１に相当）前端にワイヤを取り付けると共に、ヘッダ後端に新設管を接続し、発進立坑側から挿通したワイヤを到達立坑側から引張り、埋設されている既設管内に、ヘッダをその軸方向に移動させることにより、既設管を切断し周方向に分割して拡径する。これと同時に、ヘッダの進行に伴って、拡径した既設管に沿って新設管が引き込まれ、既設管を回収しないまま、既設管と新設管とが入れ替えられる。   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.

既設管の拡径を終えたヘッダは、回収部まで到達立坑側に引き込まれて回収される。回収部は、埋設されている既設管全体のうち、ヘッダの全長程度の大きさの引き込み側端部を、到達立坑内に設置させることのほか、既設管と同径で、ヘッダの全長程度の大きさの補助管を、既設管と到達立坑内で接続して連通させることにより、確保される。前者の場合、ヘッダによる既設管の切断時に、このヘッダを、既設管の引き込み側端部の管内まで引き寄せて、管内にヘッダが入り込んだ引き込み側端部を、到達立坑内で既設管の他の部分と切り離した後、引き込み側端部の管内からヘッダを取り出して回収する。後者の場合には、ヘッダによる既設管の切断時に、このヘッダを、補助管の管内まで引き寄せて、管内にヘッダが入り込んだ補助管と、既設管との接続を到達立坑内で解除して、補助管の管内からヘッダを取り出して回収する。   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.

特開２００２−２９５７２７号公報JP 2002-295727 A

しかしながら、特許文献１のような従来技術には、以下のような問題があった。作業者が、既設管の引き込み側端部の管内に入り込んだヘッダ（特許文献１の切断ヘッド１）を回収するため、ヘッダが入り込んだ既設管の引き込み側端部を既設管本体から切断後、この引き込み側端部を、到達立坑内から地上に運び出す作業を行う。あるいは管内にヘッダが入り込んだ補助管と、既設管との接続を解除した後、この補助管を、到達立坑内から地上に運び出す作業を行う。このような作業を行うとき、管内にヘッダが入り込んだ既設管の引き込み側端部等の重量は重いため、この引き込み側端部等を地上まで持ち上げる作業は、安全上、作業者に危険を伴う。   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. .

また、地上に運び出された既設管の引き込み側端部等からヘッダを取り出す作業では、作業者が、管内にヘッダが食い込んだ状態の引き込み側端部（補助管）を、ハンマー等の工具を使い人の手で叩きつけて変形させ、引き込み側端部等の管内でヘッダとの隙間を形成してから、ヘッダを既設管の引き込み側端部等の管内から取り出している。そのため、ヘッダの取り出し作業でも、安全上、作業者に危険を伴う。また、既設管の引き込み側端部等の管内で食い込んだヘッダを回収して、このヘッダを再使用するのに、その都度、既設管の引き込み側端部等をハンマー等の工具で叩きつけてヘッダを取り出していると、工具で叩きつけているときに、その衝撃によってヘッダが損傷してしまう虞もある上、作業の効率が低い。   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.

本発明は、上記問題点を解決するためになされたものであり、既設管の拡径後、既設管の引き込み側端部の管口からヘッダを、安全にかつ効率良く取り出して回収することができるヘッダ回収方法及びヘッダ回収装置を提供することを目的とする。   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.

上記の問題点を解決するために、本発明のヘッダ回収方法及びヘッダ回収装置は、次の構成を有している。   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）発進立坑と到達立坑との間の地中に埋設されている既設管をその軸方向に切断して拡径するヘッダを、発進立坑から引き込まれる新設管と接続した状態で、到達立坑側から引っ張ることにより、拡径した既設管の内周側に新設管を引き込んだ後、既設管の端部に入り込んだヘッダを回収するヘッダ回収方法において、少なくとも既設管の切断後、到達立坑内に配置された既設管の端部の端面と当接可能な第１当接部と、ヘッダが通り抜け可能な切り欠き部または開口部とを有する第１治具を既設管の端部の端面と対向する位置に配置し、第１当接部を端面に当接させた状態で既設管を支えながら、ヘッダを、切り欠き部または開口部を通過させて既設管の端部の管口から外部に引張り出すヘッダ取り出し工程と、を備えること、を特徴とする。
（２）（１）に記載するヘッダ回収方法において、ヘッダ取り出し工程の前に、既設管の端部の端面と当接可能な第２当接部を有する第２治具を既設管の端部の端面と対向する位置に配置し、ヘッダの引張りに伴って、既設管に作用する到達立坑側への引張り力で、到達立坑側に移動しようとする既設管を、その端面に第２当接部を当接させた状態で支えながら、ヘッダにより既設管を拡径する既設管拡径工程と、第２治具を代えて第１治具に交換する治具交換工程と、を備えること、を特徴とする。
（３）（２）に記載するヘッダ回収方法において、第２当接部は、既設管の端部の径に対応して、端部の中空部が確保可能な環状に形成され、既設管拡径工程で、第２治具を、既設管の端部の端面と対向する位置に配置した後、第２当接部を、端部の端面に、既設管の軸方向に沿う方向に延びる軸線上に、中心を有する円環の一部をなす円弧状、または円環状に当接させること、を特徴とする。
（４）（１）乃至（３）のいずれか１つに記載するヘッダ回収方法において、ヘッダ取り出し工程で、第１治具が既設管の端部の端面と対向する位置に配置された後、第１当接部を、端部の端面のうち、軸方向に延びる軸線上に、中心を有する円環の一部をなす円弧状に形成された部分に当接させると共に、切り欠き部または開口部を、端部の管内の中空部に位置合わせして配置すること、を特徴とする。 (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）発進立坑と到達立坑との間の地中に埋設されている既設管をその軸方向に切断して拡径するヘッダを有し、ヘッダを、発進立坑から引き込まれる新設管と接続した状態で、到達立坑側から引っ張ることにより、拡径した既設管の内周側に新設管を引き込む管入れ替え装置と共に用いられ、ヘッダの引張りに伴って、既設管に作用する到達立坑側への引張り力で、到達立坑側に移動しようとする既設管を支える既設管支持手段と、到達立坑内に配置された既設管の端部の端面に当接させる第１当接部と、到達立坑側への引張り力を、第１当接部を介して既設管支持手段に伝達させる第１伝達部と、ヘッダが通り抜け可能に形成された切り欠き部、または開口部とを有し、既設管の拡径時に用いる第１治具と、を備えること、を特徴とする。
（６）（５）に記載するヘッダ回収装置において、第１治具が、既設管の端部の端面と対向する位置に配置され、第１当接部が、端部の端面のうち、軸方向に延びる軸線上に、中心を有する円環の一部をなす円弧状に形成された一の部分と当接し、切り欠き部または開口部が、端部の管内の中空部に位置合わせして配置されること、を特徴とする。
（７）（５）または（６）に記載するヘッダ回収装置において、既設管の端部の端面に当接させる第２当接部と、到達立坑側への引張り力を、第２当接部を介して既設管支持手段に伝達させる第２伝達部とを有し、ヘッダで既設管を拡径しているときに用いる第２治具を備えること、を特徴とする。
（８）（７）に記載するヘッダ回収装置において、第２当接部は、既設管の径に対応して、端部管内の中空部を確保可能な環状に形成されていること、第２治具は、既設管の端部の端面と対向する位置に配置され、第２当接部が、端部の端面と、既設管の軸方向に沿う方向に延びる軸線上に、中心を有する円環の一部をなす円弧状、または円環状に当接すること、を特徴とする。
（９）（５）乃至（８）のいずれか１つに記載するヘッダ回収装置において、既設管支持手段は、第１治具または第２治具から伝達される引張り力の反力を作用させる支持部を有し、支持部が、既設管の軸方向に沿う方向に対し、移動可能に形成されていること、を特徴とする。
（１０）（９）に記載するヘッダ回収装置において、既設管支持手段は、固定されたシリンダに対し、伸縮可能なロッドを有した油圧駆動源であり、支持部が、ロッドの先端に設けられていること、を特徴とする。
（１１）（５）乃至（１０）のいずれか１つに記載するヘッダ回収装置において、第１治具は平板で形成され、第１当接部が、第１伝達部の一部として配置されていると共に、切り欠き部が、第１当接部の径方向径内側に切り欠かれて形成されていること、を特徴とする。
（１２）（７）乃至（１１）のいずれか１つに記載するヘッダ回収装置において、第２治具は、既設管の周方向に沿う方向に対し、複数に分割された分割片からなり、複数の分割片同士を着脱可能で一体に形成されていること、を特徴とする。 (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.

上記構成を有する本発明のヘッダ回収方法及びヘッダ回収装置の作用・効果について説明する。   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）発進立坑と到達立坑との間の地中に埋設されている既設管をその軸方向に切断して拡径するヘッダを、発進立坑から引き込まれる新設管と接続した状態で、到達立坑側から引っ張ることにより、拡径した既設管の内周側に新設管を引き込んだ後、既設管の端部に入り込んだヘッダを回収するヘッダ回収方法において、少なくとも既設管の切断後、到達立坑内に配置された既設管の端部の端面と当接可能な第１当接部と、ヘッダが通り抜け可能な切り欠き部または開口部とを有する第１治具を既設管の端部の端面と対向する位置に配置し、第１当接部を端面に当接させた状態で既設管を支えながら、ヘッダを、切り欠き部または開口部を通過させて既設管の端部の管口から外部に引張り出すヘッダ取り出し工程と、を備えること、を特徴とするので、ヘッダ取り出し工程では、第１治具を取り付けた後、ヘッダをさらに到達立坑側に引っ張ることにより、ヘッダが、既設管の引き込み側端部をその軸方向に切断しながら第１治具の切り欠き部または開口部を通過し、既設管の引き込み側端部の管口から外部に引張り出される。このとき、ヘッダの引張りに伴って、既設管に到達立坑側への引張り力が作用して、既設管が到達立坑側に移動しようとするが、第１治具の第１当接部を既設管の引き込み側端部の端面に当接させて既設管を支えているため、この引張り力による反力が第１当接部を介して既設管の引き込み側端部の端面に作用して、既設管は到達立坑側に移動しない。よって、ヘッダが第１治具の切り欠き部または開口部を通過するよう、ヘッダを到達立坑側に引っ張ることにより、ヘッダが、既設管の引き込み側端部から外部に引張り出されて回収することができる。 (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.

また、本発明のヘッダ回収方法では、従来技術と異なり、ヘッダを既設管の引き込み側端部から取り出して回収するとき、管内にヘッダが入り込んだ既設管の引き込み側端部を既設管本体から切断する作業や、補助管を既設管と接続させた後、ヘッダが入り込んだ補助管と既設管との接続を解除する作業が、全く不要である。また、作業者が、第１治具を既設管の引き込み側端部に配置して、ヘッダを到達立坑側に引き続き引っ張るだけで、ヘッダを簡単に回収することができ、ヘッダの回収作業が、従来の回収作業より効率良く行うことができる。   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.

また、作業者は、第１治具を既設管の引き込み側端部の端面に配置し、ヘッダの引張り操作をするだけで、ヘッダを、既設管の引き込み側端部から外部に取り出して回収できるため、作業者に危険を伴うこともなく安全に、ヘッダを回収することができる。また、作業者は、到達立坑内で既設管内から回収されたヘッダを地上まで搬出するのに、ヘッダ単体を地上に持ち上げれば良く、作業者の運搬上の負担が、既設管の引き込み側端部等と共にこの管内に入り込んだヘッダを到達立坑内から地上に運び出していた従来技術に比べて、小さくなる。加えて、ヘッダの回収時に、従来技術のように、ハンマー等の工具で既設管を叩きつけることもなく、工具による衝撃に起因して、ヘッダが損傷してしまうこともない。   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.

従って、既設管の拡径後、既設管の引き込み側端部の管口からヘッダを、安全にかつ効率良く取り出して回収することができる、という優れた効果を奏する。   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）（１）に記載するヘッダ回収方法において、ヘッダ取り出し工程の前に、既設管の端部の端面と当接可能な第２当接部を有する第２治具を既設管の端部の端面と対向する位置に配置し、ヘッダの引張りに伴って、既設管に作用する到達立坑側への引張り力で、到達立坑側に移動しようとする既設管を、その端面に第２当接部を当接させた状態で支えながら、ヘッダにより既設管を拡径する既設管拡径工程と、第２治具を代えて第１治具に交換する治具交換工程と、を備えること、を特徴とするので、既設管拡径工程で既設管の拡径作業は、例えば、ワイヤ巻取り装置等に捲回されたワイヤにより、ヘッダを到達立坑側に引張りながら、ヘッダのカッタで既設管を軸方向に切断しつつ、切断された部分をヘッダの拡径部で既設管の周方向に拡げて行うため、既設管の管内を移動するときのヘッダの摺動抵抗は非常に大きい。そのため、このような大きな力でヘッダを引っ張ると、ヘッダの引張りに伴って、既設管そのものが到達立坑側に移動しようとする既設管の引張り力が大きく作用する。このとき、第２治具を既設管の端部（引き込み側端部）に取り付けて、第２当接部を既設管の引き込み側端部の端面に当接させて既設管を支えることで、到達立坑側に移動しようとする既設管の引張り力に対する反力を、既設管の引き込み側端部の端面に作用させることで、拡径作業中、既設管は、移動しないで保持した状態にできる。よって、既設管の拡径時に、既設管を固定させたまま、前述したワイヤでヘッダを引っ張ることで、ヘッダの引張り力が既設管内のヘッダにロスなく伝わり、既設管を効率良く切断し、拡径することができる。 (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.

また、既設管拡径工程では、第２治具を用いて既設管を支えながら、ヘッダを引っ張って既設管を切断し拡径したが、ヘッダの先端部が到達立坑内の既設管の引き込み側端部の管口まで間近に到達すると、このままヘッダを引張り続けると、ヘッダと第２治具とが干渉してしまい、ヘッダが第２治具を通過できず、既設管の端部の外部へ引張り出せない。そこで、治具交換工程を行い、第２治具を第１治具に交換した後、前述したように、ヘッダを到達立坑側に引っ張ることにより、ヘッダを、第１治具の切り欠き部または開口部を通過させて、既設管の引き込み側端部から外部に引張り出して回収することができる。   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）（２）に記載するヘッダ回収方法において、第２当接部は、既設管の端部の径に対応して、端部の中空部が確保可能な環状に形成され、既設管拡径工程で、第２治具を、既設管の端部の端面と対向する位置に配置した後、第２当接部を、端部の端面に、既設管の軸方向に沿う方向に延びる軸線上に、中心を有する円環の一部をなす円弧状、または円環状に当接させること、を特徴とするので、先に例示したワイヤ巻取り装置に捲回されたワイヤを、既設管の管内のヘッダと、第２当接部の円環内を通じて接続でき、第２治具が既設管の端部（引き込み側端部）に取り付けられていても、ワイヤでヘッダを到達立坑側に引っ張ることができる。また、ヘッダの引張り時に、既設管に掛かる引張り力の反力が、円弧状または円環状の第２当接部を介して、円環状の既設管の引き込み側端部の端面に作用する。このときの反力が、既設管の軸方向発進立坑側に沿って作用すると、既設管が地中に埋設されている状態のまま傾くことなく、動かずに保持できるため、この軸方向発進立坑側と正反対である軸方向到達立坑側に向けてヘッダを軸方向に真直ぐ引っ張ると、ヘッダが、既設管の管内で、既設管の内壁に局部的に当たることもなくスムーズに移動できるようになる。そのため、ワイヤによりヘッダを既設管の管内に引っ張るときに、ワイヤ引き込み装置において、ワイヤを引っ張るときに掛かる負荷をより小さく抑えて、既設管をその軸方向に切断すると共に、切断された部分を拡径部で管の周方向に拡げて拡径することができる。 (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）（１）乃至（３）のいずれか１つに記載するヘッダ回収方法において、ヘッダ取り出し工程で、第１治具が既設管の端部の端面と対向する位置に配置された後、第１当接部を、端部の端面のうち、軸方向に延びる軸線上に、中心を有する円環の一部をなす円弧状に形成された部分に当接させると共に、切り欠き部または開口部を、端部の管内の中空部に位置合わせして配置すること、を特徴とするので、第１当接部を端部（引き込み側端部）の端面に当接させた状態で、第１治具を既設管の引き込み側端部と対向する位置に配置すると、ヘッダを到達立坑側にさらに引っ張るだけで、第１治具により、既設管が動かないよう、既設管を支えることができると共に、第１治具の切り欠き部または開口部に、ヘッダのカッタ等を通過させて、既設管の引き込み側端部をその軸方向に拡径して、ヘッダを既設管の引き込み側端部の管口から外部に簡単に取り出すことができる。 (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）発進立坑と到達立坑との間の地中に埋設されている既設管をその軸方向に切断して拡径するヘッダを有し、ヘッダを、発進立坑から引き込まれる新設管と接続した状態で、到達立坑側から引っ張ることにより、拡径した既設管の内周側に新設管を引き込む管入れ替え装置と共に用いられ、ヘッダの引張りに伴って、既設管に作用する到達立坑側への引張り力で、到達立坑側に移動しようとする既設管を支える既設管支持手段と、到達立坑内に配置された既設管の端部の端面に当接させる第１当接部と、到達立坑側への引張り力を、第１当接部を介して既設管支持手段に伝達させる第１伝達部と、ヘッダが通り抜け可能に形成された切り欠き部、または開口部とを有し、既設管の拡径時に用いる第１治具と、を備えること、を特徴とするので、本発明のヘッダ回収装置を到達立坑内に設置しておき、ヘッダが、発進立坑から到達立坑側に向けて移動して地中に埋設された既設管を切断し終えた後、ヘッダの先端部が到達立坑内に位置する既設管の端部（引き込み側端部）の管口に到達直前に位置したときに、第１治具が、この既設管の引き込み側端部に、その端面と第１当接部とを当接させた状態で取り付けられる。第１治具の取り付け後、管入れ替え装置でヘッダをさらに到達立坑側に引っ張ることにより、ヘッダが、既設管の引き込み側端部をその軸方向に切断しながら、あるいは引き込み側端部を切断した後に、第１治具の切り欠き部（または開口部）を通過し、既設管の引き込み側端部の管口から外部に引張り出される。このとき、ヘッダの引張りに伴って、既設管には到達立坑側への引張り力が作用して、既設管が到達立坑側に移動しようとするが、この引張り力の反力が、既設管支持手段から第１伝達部、第１当接部を介して既設管の引き込み側端部の端面に作用して、既設管は到達立坑側に移動しない。よって、ヘッダが第１治具の切り欠き部（または開口部）を通過するよう、管入れ替え装置でヘッダを到達立坑側に引っ張ることにより、ヘッダを、既設管の引き込み側端部から外部に完全に引張り出して回収することができる。 (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.

また、本発明のヘッダ回収装置では、従来技術と異なり、ヘッダを既設管の端部（引き込み側端部）から取り出して回収するとき、管内にヘッダが入り込んだ既設管の引き込み側端部を既設管本体から切断する作業や、補助管を既設管と接続させた後、ヘッダが入り込んだ補助管と既設管との接続を解除する作業が、全く不要である。また、作業者が、第１治具を既設管の引き込み側端部に取り付けて、管入れ替え装置によりヘッダを到達立坑側に引き続き引っ張るだけで、ヘッダが簡単に回収でき、ヘッダの回収作業が、従来の回収作業より効率良く行うことができる。   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.

また、作業者が、第１治具を既設管の引き込み側端部の端面に配置し、管入れ替え装置によるヘッダの引張り操作をするだけで、ヘッダを、既設管の引き込み側端部から外部に取り出して回収できるため、作業者に危険を伴うこともなく安全に、ヘッダを回収することができる。また、作業者は、到達立坑内で既設管内から回収されたヘッダを地上まで搬出するのに、ヘッダ単体を地上に持ち上げれば良く、作業者の運搬上の負担が、既設管の引き込み側端部等と共にこの管内に入り込んだヘッダを到達立坑内から地上に運び出していた従来技術に比べて、小さくなる。加えて、ヘッダの回収時に、従来技術のように、ハンマー等の工具で既設管を叩きつけることもなく、工具による衝撃に起因して、ヘッダが損傷してしまうこともない。   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.

従って、既設管の拡径後、既設管の引き込み側端部の管口からヘッダを、安全にかつ効率良く取り出して回収することができる、という優れた効果を奏する。   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）（５）に記載するヘッダ回収装置において、第１治具が、既設管の端部の端面と対向する位置に配置され、第１当接部が、端部の端面のうち、軸方向に延びる軸線上に、中心を有する円環の一部をなす円弧状に形成された一の部分と当接し、切り欠き部または開口部が、端部の管内の中空部に位置合わせして配置されること、を特徴とするので、例えば、到達立坑の近接位置に設置されるワイヤ巻取り装置等に捲回されたワイヤを、到達立坑から発進立坑側に挿入しておき、拡径時にこのワイヤと接続したヘッダを到達立坑側に引っ張って既設管を拡径する管入れ替え装置等の場合には、ワイヤが既設管の管内を挿通している状態であっても、ワイヤの配線経路を、切り欠き部または開口部に配置することで、第１治具を既設管の端部（引き込み側端部）を通じて、ヘッダを引っ張ることができる。 (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.

ところで、ヘッダは、ヘッダ本体を既設管の内周面に沿って進行方向に案内するガイドローラと、既設管をその軸方向に切断するカッタと、カッタにより分割させた既設管をその周方向に拡径させる円錐台状の拡径部と、を有して構成されていることがある。このようなヘッダでは拡径時に、カッタと拡径部が、その機能上、既設管の外周より径外側にも移動経路をとって移動する。   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.

本発明のヘッダ回収装置では、第１治具の第１当接部が、埋設されている既設管の引き込み側端部の端面のうち、円弧状に形成された一の部分と当接して、既設管が、第１伝達部を介して、既設管支持手段によって支えられる。これにより、既設管が保持された状態となり、この状態で、ヘッダが、上述したワイヤによって、到達立坑側から引っ張られると、既設管の外周より径外側に移動経路を持つカッタ及び拡径部のほか、ガイドローラ等が、切り欠き部または開口部に向けて移動し通過することができる。よって、ヘッダは、第１治具と干渉することなく、既設管の引き込み側端部から外部に引張り出すことができる。   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）（５）または（６）に記載するヘッダ回収装置において、既設管の端部の端面に当接させる第２当接部と、到達立坑側への引張り力を、第２当接部を介して既設管支持手段に伝達させる第２伝達部とを有し、ヘッダで既設管を拡径しているときに用いる第２治具を備えること、を特徴とするので、既設管の拡径作業は、例えば、前述したワイヤにより、数〜数十（ｔ）の大きな力でヘッダを到達立坑側に引張りながら、ヘッダのカッタで既設管を軸方向に切断しつつ、切断された部分を拡径部で既設管の周方向に拡げるため、既設管の管内を移動するときのヘッダの摺動抵抗は非常に大きい。そのため、ヘッダをこのような大きな力で引っ張ると、ヘッダの引張りに伴って、既設管そのものが到達立坑側に移動しようとする既設管の引張り力が大きく作用する。このとき、第２治具が既設管の端部（引き込み側端部）に取り付けられることで、第２当接部が既設管の引き込み側端部の端面に当接して、到達立坑側に移動しようと既設管の引張り力が、第２伝達部を介して既設管支持手段に作用する。既設管支持手段は、この引張り力の反力を既設管の引き込み側端部の端面に向けて作用させるため、拡径作業中、既設管は、移動しないで保持した状態にできる。そのため、既設管の拡径時に、既設管を固定させたまま、前述したワイヤでヘッダを引っ張ることで、例示したように、数〜数十（ｔ）の大きな力（ヘッダの引張り力）が、既設管内のヘッダにロスなく伝わり、既設管を効率良く切断し、拡径することができる。 (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）（７）に記載するヘッダ回収装置において、第２当接部は、既設管の径に対応して、端部管内の中空部を確保可能な環状に形成されていること、第２治具は、既設管の端部の端面と対向する位置に配置され、第２当接部が、端部の端面と、既設管の軸方向に沿う方向に延びる軸線上に、中心を有する円環の一部をなす円弧状、または円環状に当接すること、を特徴とするので、先に例示したワイヤ巻取り装置に捲回されたワイヤを、既設管の管内のヘッダと、第２当接部の円環内を通じて接続でき、第２治具が既設管の端部に取り付けられていても、ワイヤでヘッダを到達立坑側に引っ張ることができる。また、前述で例示したように、数〜数十（ｔ）の大きな力でヘッダを引張り、既設管に掛かる引張り力の反力が、円弧状または円環状の第２当接部を介して、円環状の既設管の端部（引き込み側端部）の端面に作用する。このときの反力が、既設管の軸方向発進立坑側に沿って作用すると、既設管が地中に埋設されている状態のまま傾くことなく、動かずに保持できるため、この軸方向発進立坑側と正反対である軸方向到達立坑側に向けてヘッダを軸方向に真直ぐ引っ張ると、ヘッダが、既設管の管内で、既設管の内壁に局部的に当たることもなくスムーズに移動できるようになる。そのため、ワイヤによりヘッダを既設管の管内に引っ張るときに、ワイヤ引き込み装置において、ワイヤを引っ張るときに掛かる負荷をより小さく抑えて、既設管をその軸方向に切断すると共に、切断された部分を拡径部で管の周方向に拡げて拡径することができる。 (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）（５）乃至（８）のいずれか１つに記載するヘッダ回収装置において、既設管支持手段は、第１治具または第２治具から伝達される引張り力の反力を作用させる支持部を有し、支持部が、既設管の軸方向に沿う方向に対し、移動可能に形成されていること、を特徴とするので、既設管の拡径にあたり、到達立坑内に位置する既設管の端部（引き込み側端部）に、第２治具を取り付ける場合や、既設管の拡径後、第２治具を取り外し、第２治具に代えて第１治具を既設管の引き込み側端部に取り付ける場合等に、既設管支持手段の支持部が、既設管の引き込み側端部から離間する向きに移動すると、作業者が、第１治具や第２治具を既設管の引き込み側端部に着脱させるときに、その作業がし易くなる。 (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.

一方で、既設管の引き込み側端部の端面に第１当接部を当接させて第１治具を既設管の引き込み側端部に配置したら、支持部を既設管の引き込み側端部に近接する向きに移動させ、既設管支持手段の支持部と第１治具の第１伝達部とを当接させる。これにより、既設管に作用する引張り力の反力が、既設管支持手段の支持部から第１治具の第１伝達部、第１当接部を介して、既設管の引き込み側端部の端面に作用するようになる。また、既設管の引き込み側端部の端面に第２当接部を当接させて第２治具を既設管の引き込み側端部に配置したら、支持部を既設管の引き込み側端部に近接する向きに移動させ、既設管支持手段の支持部と第２治具の第２伝達部とを当接させる。これにより、既設管に作用する引張り力の反力が、既設管支持手段の支持部から第２治具の第２伝達部、第２当接部を介して、既設管の引き込み側端部の端面に作用するようになる。   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）（９）に記載するヘッダ回収装置において、既設管支持手段は、固定されたシリンダに対し、伸縮可能なロッドを有した油圧駆動源であり、支持部が、ロッドの先端に設けられていること、を特徴とするので、到達立坑側に移動しようとする既設管を大きな力で安定して支えるのに、既設管支持手段を省スペースで構成することができ、コンパクト化した既設管支持手段は、スペースが狭い到達立坑内にも設置することができる。また、例えば、第１治具や第２治具の着脱時等において、既設管支持手段の支持部と既設管の引き込み側端部との間に第１治具または第２治具を挟み込みたい場合や、支持部の位置を変更したい場合に、簡単な操作でロッドが自在に伸縮、停止できるため、支持部の位置を変更するときの作業性が向上する。 (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）（５）乃至（１０）のいずれか１つに記載するヘッダ回収装置において、第１治具は平板で形成され、第１当接部が、第１伝達部の一部として配置されていると共に、切り欠き部が、第１当接部の径方向径内側に切り欠かれて形成されていること、を特徴とするので、第１治具は、１つの平板を機械加工して安価に形成することができる。また、例えば、第１当接部を既設管の端部（引き込み側端部）の端面と位置合わせして当接させた状態で、既設管の軸方向発進立坑側に既設管支持手段の支持部を第１伝達部に押圧すること等により、第１治具が、既設管の引き込み側端部に固定して簡単に取り付けることができる。さらに、第１当接部を既設管の引き込み側端部の端面と位置合わせして当接させた状態で、第１治具を既設管の引き込み側端部に固定するだけで、ヘッダが、その通過経路として、既設管の引き込み側端部の管内と連通する切り欠き部を通じて、既設管の引き込み側端部の外部に簡単に移動できるようになる。 (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）（７）乃至（１１）のいずれか１つに記載するヘッダ回収装置において、第２治具は、既設管の周方向に沿う方向に対し、複数に分割された分割片からなり、複数の分割片同士を着脱可能で一体に形成されていること、を特徴とするので、例えば、円環を２分割した分割片で、既設管を挟む上下に２つの分割片を突き合わせて連結させた第２治具の場合、作業者が、到達立坑内の既設管の端部（引き込み側端部）に第２治具を取り付けるとき、まず上半分の分割片を既設管の引き込み側端部に載置し、下半分の分割片と連結させる。これにより、作業者が、到達立坑内に入って、第２治具を既設管の引き込み側端部に取り付けるときに、第２治具全体を一度に持ち上げる必要がなく、第２治具全体の重量を分担して既設管の引き込み側端部に取り付けることができ、狭い到達立坑内で、作業者に掛かる作業負担（労力）を軽減することができる。 (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.

また、ヘッダは、ヘッダ本体を既設管の内周面に沿って進行方向に案内するガイドローラと、既設管をその軸方向に切断するカッタと、カッタにより分割させた既設管をその周方向に拡径させる円錐台状の拡径部と、を有して構成されていることがある。このようなヘッダでは、ガイドローラはヘッダの先端から後端にかけて複数配置され、拡径部はヘッダの後端に配置され、カッタは拡径部より先端側に配置されている。既設管を挟む上下に２つの分割片を突き合わせて連結された第２治具の場合、ヘッダの先端部が、到達立坑内の既設管の引き込み側端部の管口と間近な位置にあると、カッタが第２治具と接触する虞があるため、例えば、カッタの移動経路と交わる第２治具の下半分の分割片だけを取り除いておき、カッタの接触を防止する。その一方で、ヘッダが既設管の引き込み側端部の外部の管口から出るまで、ヘッダを到達立坑側に引張り続けたとき、ヘッダの引張り力に対する反力を、第２治具の上半分の分割片に作用させて、既設管の移動を阻止することができる。   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.

実施形態に係るヘッダ回収装置を用いて既設管を新設管に入れ替える様子を概略的に示す説明図である。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. 本実施形態に係る管入れ替え装置のうち、ワイヤ引き込み装置を示す説明図である。It is explanatory drawing which shows a wire drawing-in apparatus among the pipe | tube replacement apparatuses which concern on this embodiment. 本実施形態に係る管入れ替え装置のうち、ヘッダを示す正面図である。It is a front view which shows a header among the pipe | tube exchange apparatuses which concern on this embodiment. 実施形態に係るヘッダ回収装置を示す正面図であり、第２治具を用いている様子を示す図である。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. 図４に示すヘッダ回収装置の平面図である。It is a top view of the header collection | recovery apparatus shown in FIG. 実施形態に係るヘッダ回収装置の入口側板部材を示す図である。It is a figure which shows the entrance side board member of the header collection | recovery apparatus which concerns on embodiment. 実施形態に係るヘッダ回収装置の出口側板部材を示す図である。It is a figure which shows the exit side board member of the header collection | recovery apparatus which concerns on embodiment. 実施形態に係るヘッダ回収装置の支持部を示す図である。It is a figure which shows the support part of the header collection | recovery apparatus which concerns on embodiment. 実施形態に係るヘッダ回収装置の第１治具を示す図であり、（ａ）は正面図、（ｂ）側面図である。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. 第１治具の第１当接部が既設管の引き込み側端部の端面に当接する範囲を説明する図である。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. 実施形態に係るヘッダ回収装置の第２治具のうちの上側分割片を示す図であり、（ａ）は正面図、（ｂ）側面図である。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. 第２治具のうちの下側分割片を示す図であり、（ａ）は正面図、（ｂ）側面図である。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. 第２治具の上側分割片と第２治具の下側分割片とを連結させた状態を示す説明図である。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. 第２治具の第２当接部が既設管の引き込み側端部の端面に当接する範囲を説明する図である。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. 実施形態に係るヘッダ回収方法の既設管拡径工程を示す第１工程図である。It is a 1st process drawing which shows the existing pipe diameter increasing process of the header collection | recovery method which concerns on embodiment. 図１５に続く第２工程図であり、既設管拡径工程の終了直前の様子を示す説明図である。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. 図１６に続く第３工程図であり、治具交換工程を実施した様子を示す説明図である。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. 図１７に続く第４工程図であり、ヘッダ取り出し工程でヘッダを引き込み側端部の管口から引き抜いた直後の様子を示す説明図である。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. 従来技術に係る既設埋設管の回収方法を示す前工程図であるIt is a front process figure which shows the collection | recovery method of the existing underground pipe | tube concerning a prior art. 図１９に続く後工程図である。FIG. 20 is a post-process diagram following FIG. 19.

以下、本発明に係るヘッダ回収方法及びヘッダ回収装置について、実施形態を図面に基づいて詳細に説明する。図１は、実施形態に係るヘッダ回収装置を用いて既設管を新設管に入れ替える様子を概略的に示す説明図である。   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.

はじめに、本発明に係るヘッダ回収装置を用いた非開削ガス管入替工法について、図１を用いて簡単に説明する。この非開削ガス管入替工法は、ヘッダ１１をワイヤＷで引っ張る工法であり、図１に示すように、ワイヤＷ、ヘッダ１１、ワイヤ引き込み装置２０、及びワイヤ巻き取りドラム２８等からなる管入れ替え装置１０と、ヘッダ回収装置３０とを用いる。非開削ガス管入替工法では、既設管５が埋設された所定位置に、まず発進立坑１と到達立坑２とを掘った後、発進立坑１側と到達立坑２側の両側で既設管５を切断する。到達立坑２側の既設管５の切断は、到達立坑２の内壁２ａより離れた位置で行い、既設管５の引き込み側端部６（端部）が到達立坑２内に配置されるようにする。次いで、本実施形態に係るヘッダ回収装置３０とワイヤ引き込み装置２０とを、到達立坑２内に設置する。ヘッダ回収装置３０は、到達立坑２の内壁２ａとワイヤ引き込み装置２０との間に配置する。   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.

次いで、到達立坑２内において、ワイヤＷを既設管５の管内に挿入し、ワイヤＷの始端部（図１の左側端部）が発進立坑１内に到達するまで、発進立坑１側に向けて送る。一方、発進立坑１内において到達したワイヤＷの始端部と、ヘッダ１１の先端部（図１中、右側端部）とを、連結する。また、ヘッダ１１の後端部（図１中、左側端部）に、例えば、ポリエチレン製等の新設管５Ｎを接続する。ワイヤ引き込み装置２０により、ワイヤＷを到達立坑２側に引き寄せると、ヘッダ１１が、既設管５の内部に引き込まれ到達立坑２に向けて移動する。   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.

次に、管入れ替え装置１０について、図１を用いて説明する。管入れ替え装置１０は、発進立坑１と到達立坑２との間の地中に埋設されている既設管５をその軸方向Ｌに切断して拡径するヘッダ１１を有している。ヘッダ１１は、発進立坑１から引き込まれる新設管５Ｎと接続した状態で、到達立坑２に近接する地面ＧＬ上に設置したワイヤ巻き取りドラム２８に捲回されたワイヤＷを、ワイヤ引き込み装置２０で到達立坑２側に引っ張ることにより、拡径した既設管５の内周５ａ側に新設管５Ｎを引き込む。   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.

ワイヤ引き込み装置２０について、図２を用いて説明する。図２は、ワイヤ引き込み装置を示す説明図である。   The wire drawing device 20 will be described with reference to FIG. FIG. 2 is an explanatory view showing a wire drawing device.

ワイヤ引き込み装置２０は、市販されている周知の装置であり、本実施形態では、数〜数十（ｔ）の力でワイヤＷを引っ張る能力を具備している。このワイヤ引き込み装置２０は、図２に示すように、ガイド部材２１、引上げ部材２２、ワイヤ保持部材２３、クランプ部材２４、及びプーリ２７等を有する。ガイド部材２１は、図２に示すように、略Ｊ型字形状に形成され、外周に沿う縁部に、ワイヤＷを保持可能な溝を有している。   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.

引上げ部材２２は、第１の駆動源である第１の油圧シリンダ２５Ａに対し、そのロッド２５Ｂの伸縮動作による直線運動により、ガイド部材２１の溝との間に挿通したワイヤＷを、クランプまたはアンクランプする。また、この引上げ部材２２は、第２の駆動源である第２の油圧シリンダ２６Ａに対し、そのロッド２６Ｂの伸縮動作による直線運動により、軸心Ｍを中心に、ガイド部材２１の外周縁部に沿った揺動方向Ｐに対し、所定範囲を回動可能に配設されている。引上げ部材２２は、図２に示すように、ガイド部材２１に対しアンクランプ状態からクランプ状態に切り替わると同時に、位置Ｐａから位置Ｐｂまで揺動方向Ｐに移動開始することにより、ガイド部材２１と共にクランプした状態のワイヤＷを、ガイド部材２１の外周縁部に沿って到達立坑２側に引き寄せながら、到達立坑２側に引き上げる。   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.

ワイヤ保持部材２３は、ワイヤＷを保持可能な溝を有している。クランプ部材２４は、略円弧形状に形成され、爪先部の外周縁部にワイヤＷを保持可能な溝を有している。クランプ部材２４は、第２の油圧シリンダ２６Ａに対し、そのロッド２６Ｂの伸縮動作による直線運動を回転運動に変換する機構に構成され、軸心Ｎを中心に、所定範囲の揺動方向Ｑに対し回動可能に設けられている。これにより、クランプ部材２４は、ワイヤ保持部材２３と近接または離間できるようになっている。このクランプ部材２４は、ガイド部材２１に対しクランプ状態からアンクランプ状態に切り替わり、ワイヤＷの保持が解除されると同時に、ワイヤ保持部材２３に近接して、ワイヤＷが発進立坑１側に逆戻りしないよう、ワイヤ保持部材２３の溝との間に挿通したワイヤＷをクランプする。   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.

かくして、ワイヤ引き込み装置２０では、ワイヤ保持部材２３とクランプ部材２４とによりワイヤＷを保持した状態で、引上げ部材２２がガイド部材２１の外周縁部に沿って揺動方向Ｐに移動して、ワイヤＷが所定長さだけ到達立坑２側に引き上げられる。そして、この引上げ動作を連続運転で複数サイクル繰り返し行うことで、ワイヤＷが到達立坑２側に順次送り出されて引き込まれる。   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.

次に、ヘッダ１１について、図３を用いて説明する。図３はヘッダを示す正面図である。ヘッダ１１は、図３に示すように、大別して、ヘッダ本体部１２と拡径部１５とからなり、本実施形態では、拡径部１５と一体に形成されたヘッダ本体部１２には、ガイドローラ１３とカッタ１４とが回転可能に軸支されている。また、ヘッダ本体部１２の前側には、ワイヤＷの始端部と接続可能なワイヤ取付部１２Ｗが形成されている。新設管５Ｎと接続可能な新設管取付部１５Ｎが、拡径部１５の後側に形成され、拡径部１５は、カッタ１４により切断されて分割させた既設管５をその周方向Ｃに拡径させる。なお、図３に示したヘッダ１１は、その機能を説明するために単に例示した構成に過ぎず、ヘッダの構成、機能は、本実施形態に限定されるものではなく、種々変更可能である。   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.

次に、ヘッダ回収装置３０について、図１、及び図４乃至図１２を用いて説明する。図４は、実施形態に係るヘッダ回収装置を示す正面図であり、第２治具を用いている様子を示す図である。図５は、図４に示すヘッダ回収装置の平面図である。   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.

ヘッダ回収装置３０は、図１に示すように、管入れ替え装置１０と共に用いられる。ヘッダ回収装置３０は、既設管支持手段４０と、第１治具５０と、第２治具６０とを備えている。既設管支持手段４０は、図４及び図５に示すように、４つのフレーム部材３１、入口側板部材３２、出口側板部材３３、２つのシリンダ支持部材３４、及び２つのシリンダ支持部補強部材３５からなるボディに組み込まれている。   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.

はじめに、ボディについて説明する。図６は、実施形態に係るヘッダ回収装置の入口側板部材を示す図である。図７は、実施形態に係るヘッダ回収装置の出口側板部材を示す図である。入口側板部材３２は、金属製であり、図６に示すように、後述する第２治具６０とほぼ同じ外径（図１２参照）の貫通孔３２Ｈを有した矩形状の平板である。貫通孔３２Ｈの径は、第１治具５０の外周径、及び第２治具６０の外周径より小さく、第１治具５０及び第２治具６０が、貫通孔３２Ｈを通り抜け不可となっている。出口側板部材３３は、金属製であり、図７に示すように、ワイヤＷが挿通可能な貫通孔３３Ｈを有し、入口側板部材３２と同じ大きさで形成された矩形状の平板である。   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.

入口側板部材３２と出口側板部材３３とは、図４及び図５に示すように、互いに面同士を平行に対向させて配置され、４つの棒状のフレーム部材３１のそれぞれ両端を、入口側板部材３２と出口側板部材３３とのそれぞれ四隅に接続して固定されている。出口側板部材３３には、貫通孔３３Ｈを挟む左右（図７中、左右方向に対応）両側に、平板状のシリンダ支持部材３４が２つ取り付けられている。また、シリンダ支持部補強部材３５が、図５において、上側の位置する２つのフレーム部材３１と、シリンダ支持部材３４の一方とに架設され、もう１つのシリンダ支持部補強部材３５が、下側の位置する２つのフレーム部材３１と、シリンダ支持部材３４の他方とに架設されている。２つのシリンダ支持部補強部材３５はそれぞれ、ワイヤ引き込み装置２０によるワイヤＷの到達立坑２側への引張り力Ｔ１（数〜数十（ｔ）の力）に打勝つ高い剛性で、２つのフレーム部材３１と、シリンダ支持部材３４を介して出口側板部材３３に固定されている。   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.

次に、既設管支持手段４０について説明する。既設管支持手段４０は、ワイヤ引き込み装置２０によりワイヤＷと連結するヘッダ１１の引張りに伴って、既設管５に作用する到達立坑２側への引張り力Ｔ１で、到達立坑２側に移動しようとする既設管５を支える。この既設管支持手段４０は、第１治具５０または第２治具６０から伝達される引張り力Ｔ１の反力Ｔ２を平面で作用させる支持部４４を有し、支持部４４が、既設管５の軸方向Ｌに沿う方向に対し、移動可能に形成されている。   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.

具体的には、既設管支持手段４０は、シリンダ支持部補強部材３５に固定されたシリンダ４１に対し、伸縮可能なロッド４３を有した油圧駆動源である。シリンダ４１は、図示しない油圧供給源から当該シリンダ４１内に作動油を供給する第１ポート４２ａと、当該シリンダ４１内から作動油を油圧供給源に戻す第２ポート４２ｂとを有している。ロッド４３は、第１ポート４２ａと第２ポート４２ｂを通じて、シリンダ４１に流通させる作動油を制御することで、自在に伸縮して前進または後退できるようになっている。本実施形態では、２つのシリンダ４１の各ロッド４３が、それぞれほぼ同期したタイミングで伸縮するようになっている。２組のシリンダ４１及びそのロッド４３を具備した既設管支持手段４０は、ワイヤ引き込み装置２０によるワイヤＷの到達立坑２側への引張り力Ｔ１に対し、その反力Ｔ２となる外力を既設管５に作用させる駆動力を発揮可能な性能を備えている。   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.

ロッド４３の先端には、支持部４４が設けられている。図８は、実施形態に係るヘッダ回収装置の支持部を示す図である。支持部４４は、図８に示すように、ワイヤＷが挿通可能な貫通孔４４Ｈを有し、略円環面状に形成された平板である。２つのロッド４３の先端が、参照する図４、図５及び図８に示すように、貫通孔４４Ｈを跨いだ状態で支持部４４に固定されている。貫通孔４４Ｈの径は、ヘッダ１１（拡径部１５）のほか、このヘッダ１１と連結する新設管５Ｎが挿通可能な径であり、ヘッダ１１や新設管５Ｎが、貫通孔４４Ｈを通り抜けできるようになっている。また、貫通孔４４Ｈの径は、第１治具５０の外周径、及び第２治具６０の外周径より小さく、第１治具５０及び第２治具６０が、貫通孔４４Ｈを通り抜け不可となっている。   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.

次に、第１治具５０について説明する。第１治具５０は、到達立坑２内に配置された既設管５の引き込み側端部６の端面６ａに当接させる第１当接部５２と、ワイヤ引き込み装置２０によるワイヤＷの到達立坑２側への引張り力Ｔ１を、第１当接部５２を介して既設管支持手段４０に伝達させる第１伝達部５１と、ヘッダ１１が通り抜け可能に形成された第１治具切り欠き部５３（切り欠き部）と、を有する。この第１治具５０は、既設管５の拡径後に用いられる。図９は、実施形態に係るヘッダ回収装置の第１治具を示す図であり、（ａ）は正面図、（ｂ）側面図である。図１０は、第１治具の第１当接部が既設管の引き込み側端部の端面に当接する範囲を説明する図である。   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.

具体的には、第１治具５０は、図９に示すように、円弧状の平板で形成され、第１当接部５２が、第１伝達部５１の一部として配置されていると共に、第１治具切り欠き部５３が、第１当接部５２の径方向径内側に切り欠かれて形成されている。この第１治具５０は、既設管５の拡径後、ヘッダ１１の一部として、例えば、ワイヤ取付部１２Ｗのほか、前側のガイドローラ１３辺りまでのヘッダ本体部１２の前部が、既設管５の引き込み側端部６の管口の直前位置まで到達した時点で、既設管５の引き込み側端部６に取り付けられる。第１治具５０が既設管５の引き込み側端部６に取り付けられた状態では、第１当接部５２の第１当接面５２ａは、図９及び図１０に示すように、引き込み側端部６の端面６ａのうち、軸方向Ｌに延びる軸線ＡＸ（図１参照）上に、中心を有する円環の一部をなす円弧状に形成された一の部分６Ｓａと当接し、第１当接部５２と当接しない他の部分６Ｓｂは、第１治具切り欠き部５３に配置される。第１治具５０には、取手５４が設けられている。   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.

次に、第２治具６０について説明する。第２治具６０は、既設管５の引き込み側端部６の端面６ａに当接させる第２当接部６２Ａ，６２Ｂと、ワイヤ引き込み装置２０によるワイヤＷの到達立坑２側への引張り力Ｔ１を、第２当接部６２Ａ，６２Ｂを介して既設管支持手段４０に伝達させる第２伝達部６３Ａ，６３Ｂと、を有する。この第２治具６０は、ヘッダ１１で既設管５を切断しているときに用いられる。   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.

図１１は、実施形態に係るヘッダ回収装置の第２治具のうちの上側分割片を示す図であり、（ａ）は正面図、（ｂ）は側面図である。図１２は、第２治具のうちの下側分割片を示す図であり、（ａ）は正面図、（ｂ）側面図である。図１３は、第２治具の上側分割片と第２治具の下側分割片とを連結させた状態を示す説明図である。図１４は、第２治具の第２当接部が既設管の引き込み側端部の端面に当接する範囲を説明する図である。   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.

第２治具は、図１１乃至図１４に示すように、既設管５の引き込み側端部６の周方向Ｃに沿う方向に対し、複数（本実施形態では２つ）に分割された上側分割片６１Ａ及び下側分割片６１Ｂ（分割片）からなり、上側分割片６１Ａと下側分割片６１Ｂとを着脱可能に形成されている。はじめに、上側分割片６１Ａについて、図１１を用いて説明する。   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.

上側分割片６１Ａは、図１１に示すように、中心角１８０度の略扇型形状に形成された板状の第２伝達部６３Ａと、その内周面から径外側に少し離れた内側縁部に、隙間を挟んで立設した２つの略四分の１円筒形状の上側分割片筒部６５Ａとを有している。第２当接部６２Ａは、第２伝達部６３Ａのうち、２つの上側分割片筒部６５Ａの径内側に位置しており、上側分割片筒部６５Ａの径内側にある第２伝達部６３Ａの面が上側分割片当接面６２Ａａとなっている。上側分割片筒部６５Ａの内径は、参照する図１４に示すように、既設管５の引き込み側端部６の外径とほぼ同径となっており、上側分割片筒部６５Ａで引き込み側端部６の上半分を包み込むことで、上側分割片６１Ａが引き込み側端部６に取り付けできるようになっている。   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.

第２伝達部６３Ａにおいて、ちょうど中心角９０度の位置には、第２治具切り欠き部６６が、２つの上側分割片筒部６５Ａの間の隙間と共に、第２伝達部６３Ａの一部を切り欠いて形成されている。第２治具切り欠き部６６は、ヘッダ１１（ヘッダ本体部１２）の先頭部が既設管５の引き込み側端部６の端面６ａ（管口）を通過しようとしたときに、ヘッダ本体部１２のガイドローラ１３が、上側分割片６１Ａの第２伝達部６３Ａ（第２治具６０）と干渉しない程度の大きさとなっている。   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.

第２伝達部６３Ａには、２つの上側分割片筒部６５Ａを挟む両側に係合片６８がそれぞれ配設されている。係合片６８は、図１１に示すように、平板の長手方向一方側（図１１（ａ）の上側）に、第２伝達部６３Ａに立設した軸部６７Ａを中心に回動可能に設けられ、長手方向他方側（図１１（ａ）の下側）を、第２伝達部６３Ａの端面である下側分割片突合せ面６１Ｂｂより離れて位置する。係合片６８の長手方向他方側には、係合片６８の長辺から内側に切り欠いた係合溝６９が、形成されている。上側分割片６１Ａには、取
手６４Ａが、中心角９０度の位置に設けられている。 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.

次に、下側分割片６１Ｂについて、図１２を用いて説明する。下側分割片６１Ｂは、上側分割片６１Ａと対となる分割片で、図１２に示すように、第２伝達部６３Ａと同径で、中心角１８０度の略扇型形状に形成された板状の第２伝達部６３Ｂと、その内周面から径外側に少し離れた内側縁部に、隙間を挟んで立設した２つの略四分の１円筒形状の下側分割片筒部６５Ｂとを有している。第２当接部６２Ｂは、第２伝達部６３Ｂのうち、２つの下側分割片筒部６５Ｂの径内側に位置しており、下側分割片筒部６５Ｂの径内側にある第２伝達部６３Ｂの面が下側分割片当接面６２Ｂａとなっている。下側分割片筒部６５Ｂの内径は、上側分割片筒部６５Ａと同様、参照する図１４に示すように、既設管５の引き込み側端部６の外径とほぼ同径となっており、下側分割片筒部６５Ｂで引き込み側端部６の下半分を包み込むことで、下側分割片筒部６５Ｂが引き込み側端部６に取り付けできるようになっている。また、下側分割片６１Ｂには、取手６４Ｂが、中心角９０度の位置に設けられている。   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.

第２伝達部６３Ｂには、２つの下側分割片筒部６５Ｂを挟む両側にピン６７Ｂがそれぞれ配設されている。ピン６７Ｂは、上側分割片６１Ａの係合片６８の係合溝６９と係合可能に形成されている。図１３に示すように、上側分割片６１Ａの上側分割片突合せ面６１Ａｂと、下側分割片６１Ｂの下側分割片突合せ面６１Ｂｂとを互いに対向して突き合わせ、係合片６８の係合溝６９にピン６７Ｂを係合させると、上側分割片６１Ａと下側分割片６１Ｂとが固定され、第２治具６０として一体となる。これにより、上側分割片当接面６２Ａａと下側分割片当接面６２Ｂａとが、同じ平面上で、円環面から第２治具切り欠き部６６が欠落した扇型形状に形成され、第２治具切り欠き部６６と繋がった第２治具貫通部６０Ｈが、第２治具６０の中央に形成される。   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.

すなわち、第２当接部６２Ａ，６２Ｂは、既設管５の引き込み側端部６の径に対応して、引き込み側端部６の中空部６Ｓが確保可能な環状に形成される。第２治具６０は、既設管５を拡径している間、ヘッダ１１の一部として、例えば、ワイヤ取付部１２Ｗのほか、前側のガイドローラ１３辺りまでのヘッダ本体部１２の先頭部が、第２治具６０の第２当接部６２Ａ，６２Ｂに近接する位置まで、既設管５の引き込み側端部６に取り付けられる。第２治具６０が既設管５の引き込み側端部６に取り付けられた状態では、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａが、図１４に示すように、引き込み側端部６の端面６ａの大半の部分と、既設管５の軸方向Ｌに沿う方向に延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に当接する。   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.

次に、本実施形態に係るヘッダ回収方法について、説明する。本実施形態に係るヘッダ回収方法は、非開削ガス管入替工法による新設管５Ｎへの置き換え工事において、前述した管入れ替え装置１０とヘッダ回収装置３０とにより、既設管５を新設管５Ｎに入れ替える一連の作業の中で行われ、次述する拡径準備工程の実施した後に行われる。   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.

拡径準備工程ではまず、発進立坑１と到達立坑２とを掘った後、既設管５を発進立坑１側で切断する共に、この既設管５の到達立坑２側を、到達立坑２の内壁２ａより離れた位置で切断し、既設管５の引き込み側端部６を到達立坑２内に配置する。次いで、ワイヤ引き込み装置２０とヘッダ回収装置３０とを到達立坑２内に運び入れて、ヘッダ回収装置３０を、到達立坑２の内壁２ａとワイヤ引き込み装置２０との間に設置する。次いで、到達立坑２内において、ワイヤＷを既設管５の引き込み側端部６の管口から引き込み側端部６管内の中空部６Ｓ（図１４参照）に挿入し、ワイヤＷの始端部（図１の左側端部）が発進立坑１内に到達するまで、発進立坑１側に向けて送る。一方、発進立坑１内において到達したワイヤＷの始端部と、ヘッダ１１の先端部（図１中、右側端部）とを、連結する。また、ヘッダ１１の後端部（図１中、左側端部）に、新設管５Ｎを接続する。発進立坑１と到達立坑２とを繋ぐ切断後の既設管５において、その管内の発進立坑１側の拡径起点となる位置に、ワイヤＷと新設管５Ｎを接続したヘッダ１１を、設置しておく。   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.

次に、本実施形態に係るヘッダ回収方法について、図１５乃至図１８を用いて説明する。本実施形態に係るヘッダ回収方法は、既設管拡径工程、治具交換工程、及びヘッダ取り出し工程を有し、各工程はこの順に実施される。   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.

図１５は、実施形態に係るヘッダ回収方法の既設管拡径工程を示す第１工程図である。図１６は、図１５に続く第２工程図であり、既設管拡径工程の終了直前の様子を示す説明図である。図１７は、図１６に続く第３工程図であり、治具交換工程を実施した様子を示す説明図である。図１８は、図１７に続く第４工程図であり、ヘッダ取り出し工程でヘッダを引き込み側端部の管口から引き抜いた直後の様子を示す説明図である。なお、図１５乃至図１８は、図を見易くするため、図５において、既設管支持手段４０の支持部４４の中央（図５中、上下方向中央）からその奥側（図５中、上側）を見た視点で、図示されている。   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.

はじめに、既設管拡径工程について、図１３乃至図１５を用いて説明する。既設管拡径工程では、図１３乃至図１５に示すように、既設管５の引き込み側端部６の端面６ａと当接可能な第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを有する第２治具６０（上側分割片６１Ａ及び下側分割片６１Ｂ）を、既設管５の引き込み側端部６の端面６ａと対向する位置に配置する。そして、ヘッダ１１の引張りに伴って、既設管５に作用する到達立坑２側への引張り力Ｔ１で、到達立坑２側に移動しようとする既設管５を、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを引き込み側端部６の端面６ａに当接させた状態で支えながら、ヘッダ１１により既設管５を拡径する。この既設管拡径工程は、ヘッダ取り出し工程の前に実施される。   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.

具体的に説明する。拡径準備工程の終了後、到達立坑２内において、作業者が、取手６４Ａで掴んだ上側分割片６１Ａを既設管５の引き込み側端部６の上方に、ヘッダ１１のガイドローラ１３の移動経路に上側分割片６１Ａの第２治具切り欠き部６６を位置合わせして取り付ける。また、作業者は、取手６４Ｂで掴んだ下側分割片６１Ｂをこの引き込み側端部６の下方に取り付けて、係合片６８の係合溝６９をピン６７Ｂに係合させることにより、上側分割片６１Ａと下側分割片６１Ｂとを一体に固定する。これにより、上側分割片当接面６２Ａａが、引き込み側端部６の端面６ａの上方半分と対向する位置に配置され、下側分割片当接面６２Ｂａが、引き込み側端部６の端面６ａの下方半分と対向する位置に配置される。   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.

既設管拡径工程では、第２治具６０が既設管５の引き込み側端部６の端面６ａと対向する位置に配置された後、第２当接部６２Ａの上側分割片当接面６２Ａａと、第２当接部６２Ｂの下側分割片当接面６２Ｂａとを、引き込み側端部６の端面６ａに、既設管５の軸方向Ｌに沿う方向に延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に当接させる。これにより、第２当接部６２Ａの上側分割片当接面６２Ａａと、第２当接部６２Ｂの下側分割片当接面６２Ｂａとが、図１４に示すように、既設管５の引き込み側端部６の径に対応して、引き込み側端部６の中空部６Ｓが確保可能な環状に形成され、ワイヤＷの配線経路を確保できる。   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.

また、既設管拡径工程では、ワイヤＷでヘッダ１１を引っ張っているときには、既設管支持手段４０における２つのシリンダ４１に対し、予め各ロッド４３を前進させて伸ばしておく。そして、ワイヤ引き込み装置２０により、ワイヤＷを引張り力Ｔ１（本実施形態では、数〜数十（ｔ）の引張り力）で到達立坑２側に引っ張ることで、既設管５の中空部６Ｓを移動経路として、ヘッダ１１を拡径起点位置から到達立坑２側に移動させる。ヘッダ１１を引っ張ることにより、ヘッダ１１の移動中、２つのカッタ１４が既設管５を軸方向Ｌに沿って切断し、拡径部１５が、カッタ１４で周方向Ｃに分割した切断後の既設管５を拡径する。   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.

このとき、ヘッダ１１の引張りに伴って、既設管５に作用する到達立坑２側への引張り力Ｔ１で、既設管５が到達立坑２側に移動しようとする。それを回避するため、図１５に示すように、ヘッダ回収装置３０において、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを引き込み側端部６の端面６ａに当接させると共に、上側分割片６１Ａの上側分割片支持部当接面６１Ａａ、及び下側分割片６１Ｂの下側分割片支持部当接面６１Ｂａを、支持部４４の支持面４４ａと当接させる。これにより、引張り力Ｔ１に対する反力Ｔ２を支持部４４で作用させて到達立坑２側に移動しようとする既設管５を支えながら、ヘッダ１１で既設管５の拡径を行い、ヘッダ１１に追従して導入する新設管５Ｎを、拡径した既設管５の内周側に引き入れることができる。ヘッダ１１による既設管５の拡径は、ヘッダ本体部１２の先頭部が到達立坑２内に配置される既設管５の引き込み側端部６の管口に概ね差し掛かる位置まで、第２治具６０を用いて行われる。   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.

ヘッダ１１において、カッタ１４と拡径部１５とが、第２治具６０の第２治具貫通部６０Ｈを通り抜けできない。そのため、例えば、ワイヤ取付部１２Ｗを含むヘッダ本体部１２の先頭部が、既設管５の引き込み側端部６の管口からちょうど外部に抜け出したところで、作業者は、ワイヤ引き込み装置２０によるワイヤＷの引張りを停止し、既設管５の拡径を中断する。その後、既設管支持手段４０における２つのシリンダ４１に対し、予め各ロッド４３を収縮させて後退させる。これにより、既設管支持手段４０における支持部４４の支持面４４ａは、第２治具６０における上側分割片６１Ａの上側分割片支持部当接面６１Ａａ、及び下側分割片６１Ｂの下側分割片支持部当接面６１Ｂａと離間する。離間後、作業者は、図１６に示すように、第２治具６０（上側分割片６１Ａ及び下側分割片６１Ｂ）のうち、下側分割片６１Ｂだけを既設管５の引き込み側端部６から取り外す。   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.

下側分割片６１Ｂを既設管５の引き込み側端部６から取り外したら、ワイヤ引き込み装置２０によるワイヤＷの引張りを再開する。このとき、支持部４４の支持面４４ａと上側分割片６１Ａの上側分割片支持部当接面６１Ａａとを離間させたままでも良いが、既設管支持手段４０の各ロッド４３を再度前進させて、支持部４４の支持面４４ａを上側分割片６１Ａの上側分割片支持部当接面６１Ａａに当接させても良い。   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.

下側分割片６１Ｂの取り外し後、作業者は、ヘッダ１１を、さらに到達立坑２側に移動させ、後側のカッタ１４が既設管５の引き込み側端部６の管口からちょうど外部に抜け出した直後のところで、ワイヤ引き込み装置２０によるワイヤＷの引張りを再度停止する。既設管５の切断作業は、後側のカッタ１４が引き込み側端部６の端面６ａを切断した時点で、終了する。   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.

次いで、第２治具６０を代えて第１治具５０に交換する治具交換工程を行う。具体的には、作業者は、支持部４４の支持面４４ａと上側分割片６１Ａの上側分割片支持部当接面６１Ａａとを離間させた状態で、第２治具６０の残りの下側分割片６１Ｂを既設管５の引き込み側端部６から取り外す。その後、作業者は、取手５４で第１治具５０を掴み、第１治具５０の第１治具切り欠き部５３内にヘッダ１１のヘッダ本体部１２の先頭部が入るよう、第１治具５０をヘッダ本体部１２の先頭部の上方に載置する。第１治具５０は、参照する図９及び、図１７に示すように、第１治具５０と支持部４４とがほぼ平行になるよう、第１治具５０における取手５４側の面（第１当接面５２ａを含む面）を、既設管５の引き込み側端部６の端面６ａに当接させた状態で、ヘッダ本体部１２の先頭部に載置す
る。その後、既設管支持手段４０の各ロッド４３を再び前進させる。また、ワイヤ引き込み装置２０によるワイヤＷの引張りを再開する。 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.

次いで、ヘッダ取り出し工程を行う。ヘッダ取り出し工程は、発進立坑１と到達立坑２との間の地中に埋設されている既設管５をその軸方向Ｌに切断して拡径するヘッダ１１を、発進立坑１から引き込まれる新設管５Ｎと接続した状態で、到達立坑２側から引っ張ることにより、拡径した既設管５の内周５ａ側に新設管５Ｎを引き込んだ後、既設管５の引き込み側端部６に入り込んだヘッダ１１を回収する。そして、このヘッダ取り出し工程は、既設管５の拡径後、到達立坑２内に配置された既設管５の引き込み側端部６の端面６ａと当接可能な第１当接部５２の第１当接面５２ａと、ヘッダ１１が通り抜け可能な第１治具切り欠き部５３を有する第１治具５０を既設管５の引き込み側端部６の端面６ａと対向する位置に配置し、第１当接面５２ａを端面６ａに当接させた状態で既設管５を支えながら、ヘッダ１１を、第１治具切り欠き部５３を通過させて既設管５の引き込み側端部６の管口から外部に引張り出す。   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.

このヘッダ取り出し工程で、第１治具５０が既設管５の引き込み側端部６の端面６ａと対向する位置に配置された後、第１当接部５２の第１当接面５２ａを、図１０に示すように、引き込み側端部６の端面６ａのうち、軸方向Ｌに延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に形成された一の部分６Ｓａに当接させると共に、第１治具切り欠き部５３を、第１当接面５２ａと当接しない他の部分６Ｓｂのほか、引き込み側端部６の管内の中空部６Ｓに位置合わせして配置する。   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.

具体的に説明する。カッタ１４で周方向Ｃに分割した切断後の既設管において、その引き込み側端部６の管口から、ヘッダ１１の拡径部１５を完全に引き抜くには、ヘッダ１１の拡径部１５は後方ほど径が大きいため、拡径後の既設管５の内周５ａ側を拡径部１５が移動するときに生じる摺動抵抗は、かなり大きい。そのため、既設管支持手段４０の各ロッド４３を再び前進させて、支持部４４の支持面４４ａを、第１治具５０の第１当接部５２の第１当接面５２ａに当接させる。当接後、この状態で、図２８に示すように、ワイヤ引き込み装置２０によりワイヤＷを、その摺動抵抗に打勝つ引張り力Ｔ１で再度引張り、ヘッダ１１を、既設管５の引き込み側端部６の管口に向けて引張り込む。このとき、引張り力Ｔ１に対する反力Ｔ２を支持部４４で作用させて到達立坑２側に移動しようとする既設管５を支えながら、新設管５Ｎの先端部が到達立坑２内の所定位置まで到達するまで、ヘッダ１１をワイヤＷで引き寄せて、ヘッダ１１全体を、既設管５の引き込み側端部６の管口から外部に引張り出す。   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.

次いで、ワイヤ引き込み装置２０によるワイヤＷの引張りを停止し、既設管支持手段４０における２つのシリンダ４１に対し、予め各ロッド４３を収縮させて後退させた後、第１治具５０を取り外す。ヘッダ１１のヘッダ本体部１２のワイヤ取付部１２Ｗと、ワイヤＷの始端部との連結を解除すると共に、ヘッダ１１のヘッダ本体部１２の新設管取付部１５Ｎと、新設管５Ｎの先端部との連結を解除した後、かくして、ヘッダ１１が既設管５から回収される。   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.

前述した構成を有する本実施形態に係るヘッダ回収装置３０及びヘッダ回収方法の作用・効果について説明する。   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.

本実施形態に係るヘッダ回収方法では、
（１）発進立坑１と到達立坑２との間の地中に埋設されている既設管５をその軸方向Ｌに切断して拡径するヘッダ１１を、発進立坑１から引き込まれる新設管５Ｎと接続した状態で、到達立坑２側から引っ張ることにより、拡径した既設管５の内周５ａ側に新設管５Ｎを引き込んだ後、既設管５の引き込み側端部６に入り込んだヘッダ１１を回収するヘッダ回収方法において、少なくとも既設管５の切断後、到達立坑２内に配置された既設管５の引き込み側端部６の端面６ａと当接可能な第１当接部５２の第１当接面５２ａと、ヘッダ１１が通り抜け可能な第１治具切り欠き部５３とを有する第１治具５０を既設管５の引き込み側端部６の端面６ａと対向する位置に配置し、第１当接部５２の第１当接面５２ａを端面６ａに当接させた状態で既設管５を支えながら、ヘッダ１１を、第１治具切り欠き部５３を通過させて既設管５の引き込み側端部６の管口から外部に引張り出すヘッダ取り出し工程と、を備えることを特徴とするので、ヘッダ取り出し工程では、第１治具５０を取り付けた後、ヘッダ１１をさらに到達立坑２側に引っ張ることにより、ヘッダ１１が、切断後、既設管５の引き込み側端部６をその軸方向Ｌに第１治具５０の第１治具切り欠き部５３を通過し、既設管５の引き込み側端部６の管口から外部に引張り出される。 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.

このとき、ヘッダ１１の引張りに伴って、既設管５に到達立坑２側への引張り力Ｔ１が作用して、既設管５が到達立坑２側に移動しようとするが、第１治具５０の第１当接部５２の第１当接面５２ａを既設管５の引き込み側端部６の端面６ａに当接させて既設管５を支えているため、この引張り力Ｔ１による反力Ｔ２が第１当接部５２の第１当接面５２ａを介して既設管５の引き込み側端部６の端面６ａに作用して、既設管５は到達立坑２側に移動しない。よって、ヘッダ１１が第１治具５０の第１治具切り欠き部５３を通過するよう、ヘッダ１１を到達立坑２側に引っ張ることにより、ヘッダ１１が、既設管５の引き込み側端部６から外部に引張り出されて回収することができる。   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.

また、本実施形態に係るヘッダ回収方法では、従来技術と異なり、ヘッダ１１を既設管５の引き込み側端部６から取り出して回収するとき、管内にヘッダが入り込んだ既設管の引き込み側端部を既設管本体から切断する作業や、補助管を既設管と接続させた後、ヘッダが入り込んだ補助管と既設管との接続を解除する作業が、全く不要である。また、作業者が、第１治具５０を既設管５の引き込み側端部６に配置して、ヘッダ１１を到達立坑２側に引き続き引っ張るだけで、ヘッダ１１を簡単に回収することができ、ヘッダ１１の回収作業が、従来の回収作業より効率良く行うことができる。   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.

また、作業者は、第１治具５０を既設管５の引き込み側端部６の端面６ａに配置し、ヘッダ１１の引張り操作をするだけで、ヘッダ１１を、既設管５の引き込み側端部６から外部に取り出して回収できるため、作業者に危険を伴うこともなく安全に、ヘッダを回収することができる。また、作業者は、到達立坑２内で既設管１内から回収されたヘッダ１１を地上ＧＬまで搬出するのに、ヘッダ１１単体を地上に持ち上げれば良く、作業者の運搬上の負担が、既設管の引き込み側端部等と共にこの管内に入り込んだヘッダを到達立坑内から地上に運び出していた従来技術に比べて、小さくなる。加えて、ヘッダ１１の回収時に、従来技術のように、ハンマー等の工具で既設管を叩きつけることもなく、工具による衝撃に起因して、ヘッダ１１が損傷してしまうこともない。   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.

従って、既設管５の拡径後、既設管５の引き込み側端部６の管口からヘッダ１１を、安全にかつ効率良く取り出して回収することができる、という優れた効果を奏する。   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）（１）に記載するヘッダ回収方法において、ヘッダ取り出し工程の前に、既設管５の引き込み側端部６の端面６ａと当接可能な第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを有する第２治具６０を既設管５の引き込み側端部６の端面６ａと対向する位置に配置し、ヘッダ１１の引張りに伴って、既設管５に作用する到達立坑２側への引張り力Ｔ１で、到達立坑２側に移動しようとする既設管５を、その端面６ａに第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを当接させた状態で支えながら、ヘッダ１１により既設管５を拡径する既設管拡径工程と、第２治具６０を代えて第１治具５０に交換する治具交換工程と、を備えることを特徴とするので、既設管拡径工程で既設管５の拡径作業は、本実施形態のように、例えば、ワイヤ巻き取りドラム２８に捲回されたワイヤＷにより、数〜数十（ｔ）という大きな力Ｔ１でヘッダ１１を到達立坑２側に引張りながら、ヘッダ１１のカッタ１４で既設管５を軸方向Ｌに切断しつつ、切断された部分をヘッダ１１の拡径部１５で既設管５の周方向Ｃに拡げて行うため、既設管５の管内（中空部６Ｓ）を移動するときのヘッダ１１の摺動抵抗は非常に大きい。 (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.

そのため、このような大きな力Ｔ１でヘッダ１１を引っ張ると、ヘッダ１１の引張りに伴って、既設管５そのものが到達立坑２側に移動しようとする既設管５の引張り力Ｔ１が大きく作用する。このとき、第２治具６０を既設管５の引き込み側端部６に取り付けて、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを既設管５の引き込み側端部６の端面６ａに当接させて既設管５を支えることで、到達立坑２側に移動しようとする既設管５の引張り力Ｔ１に対する反力Ｔ２を、既設管５の引き込み側端部６の端面６ａに作用させることで、拡径作業中、既設管５は、移動しないで保持した状態にできる。よって、既設管５の拡径時に、既設管５を固定させたまま、ワイヤＷでヘッダ１１を引っ張ることで、例示したように、数〜数十（ｔ）という大きな力Ｔ１（ヘッダ１１の引張り力Ｔ１）が、既設管５内のヘッダ１１にロスなく伝わり、既設管５を効率良く切断し、拡径することができる。   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.

また、既設管拡径工程では、第２治具６０を用いて既設管５を支えながら、ヘッダ１１を引っ張って既設管５を切断し拡径したが、ヘッダ１１の先端部が到達立坑２内の既設管５の引き込み側端部６の管口間近まで到達すると、このままヘッダ１１を引張り続けると、ヘッダ１１と第２治具６０とが干渉してしまい、ヘッダ１１が第２治具６０を通過できず、既設管５の引き込み側端部６の管口から外部へ引張り出せない。そこで、治具交換工程を行い、第２治具６０を第１治具５０に交換した後、前述したように、ヘッダ１１を到達立坑２側に引っ張ることにより、ヘッダ１１を、第１治具５０の第１治具切り欠き部５３を通過させて、既設管５の引き込み側端部６から外部に引張り出して回収することができる。   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）（２）に記載するヘッダ回収方法において、第２当接部６２Ａの側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａは、既設管５の引き込み側端部６の径に対応して、引き込み側端部６の中空部６Ｓが確保可能な環状に形成され、既設管拡径工程で、第２治具６０を既設管５の引き込み側端部６の端面６ａと対向する位置に配置した後、第２当接部６２Ａの側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを、引き込み側端部６の端面６ａに、既設管５の軸方向Ｌに沿う方向に延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に当接させることを特徴とするので、ワイヤ巻き取りドラム２８に捲回されたワイヤＷを、既設管５の管内のヘッダ１１と、第２当接部６２Ａ，６２Ｂの円環内の第２治具貫通部６０Ｈを通じて接続でき、第２治具６０が既設管５の引き込み側端部６に取り付けられていても、ワイヤＷでヘッダ１１を到達立坑２側に引っ張ることができる。 (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.

また、本実施形態では、例示したように、数〜数十（ｔ）という大きな力Ｔ１でヘッダ１１を引張り、既設管５に掛かる引張り力Ｔ１の反力Ｔ２が、円弧状の第２当接部６２Ａの側分割片当接面６２Ａａ及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを介して、円環状の既設管５の引き込み側端部６の端面６ａに作用する。このときの反力Ｔ２が、既設管５の軸方向Ｌ発進立坑１側に沿って作用すると、既設管５が地中に埋設されている状態のまま傾くことなく、動かずに保持できるため、この軸方向Ｌ発進立坑１側とその正反対である軸方向Ｌ到達立坑２側に向けてヘッダ１１を軸方向Ｌに真直ぐ引っ張ると、ヘッダ１１が、既設管５の管内で、既設管５の内壁（内周面５ａ）に局部的に当たることもなくスムーズに移動できるようになる。そのため、ワイヤＷによりヘッダ１１を既設管５の管内に引っ張るときに、ワイヤ引き込み装置２０において、ワイヤＷを引っ張るときに掛かる負荷をより小さく抑えて、既設管５をその軸方向Ｌに切断すると共に、切断された部分を拡径部１５で管の周方向Ｃに拡げて拡径することができる。   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）（１）乃至（３）のいずれか１つに記載するヘッダ回収方法において、ヘッダ取り出し工程で、第１治具５０が既設管５の引き込み側端部６の端面６ａと対向する位置に配置された後、第１当接部５２の第１当接面５２ａを、引き込み側端部６の端面６ａのうち、軸方向Ｌに延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に形成された一の部分６Ｓａに当接させると共に、第１治具切り欠き部５３を、引き込み側端部６の管内の中空部６Ｓに位置合わせして配置することを特徴とするので、第１当接部５２の第１当接面５２ａを引き込み側端部６の端面６ａに当接させた状態で、第１治具５０を既設管５の引き込み側端部６の端面６ａと対向する位置に配置すると、ヘッダ１１を到達立坑２側にさらに引っ張るだけで、第１治具５０により、既設管５が動かないよう、既設管５を支えることができると共に、第１治具５０の第１治具切り欠き部５３に、ヘッダ１１のカッタ１４等を通過させて、既設管５の引き込み側端部６をその軸方向Ｌに切断し拡径して、ヘッダ１１を既設管５の引き込み側端部６の管口から外部に簡単に取り出すことができる。 (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.

本実施形態に係るヘッダ回収装置３０では、
（５）発進立坑１と到達立坑２との間の地中に埋設されている既設管５をその軸方向Ｌに切断して拡径するヘッダ１１を有し、ヘッダ１１を、発進立坑１から引き込まれる新設管５Ｎと接続した状態で、到達立坑１側から引っ張ることにより、拡径した既設管５の内周５ａ側に新設管５Ｎを引き込む管入れ替え装置１０と共に用いられ、ヘッダ１１の引張りに伴って、既設管５に作用する到達立坑２側への引張り力Ｔ１で、到達立坑２側に移動しようとする既設管５を支える既設管支持手段４０と、到達立坑２内に配置された既設管５の引き込み側端部６の端面６ａに当接させる第１当接部５２の第１当接面５２ａと、到達立坑２側への引張り力Ｔ１を、第１当接部５２を介して既設管支持手段４０に伝達させる第１伝達部５１と、ヘッダ１１が通り抜け可能に形成された第１治具切り欠き部５３とを有し、既設管５の拡径後に用いる第１治具５０と、を備えることを特徴とするので、本実施形態に係るヘッダ回収装置３０を到達立坑２内に設置しておき、ヘッダ１１が、発進立坑１から到達立坑２側に向けて移動して、地中に埋設された既設管５を拡径し終える直前で、ヘッダ１１の先端部が到達立坑２内に位置する既設管５の引き込み側端部６内に到達したときに、第１治具５０が、この既設管５の引き込み側端部６に、その端面６ａの一の部分６Ｓａと第１当接部５２の第１当接面５２ａとを当接させた状態で、取り付けられる。 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.

第１治具５０の取り付け後、管入れ替え装置１０でヘッダ１１をさらに到達立坑２側に引っ張ることにより、ヘッダ１１が、既設管５の引き込み側端部６をその軸方向Ｌに第１治具５０の第１治具切り欠き部５３を通過し、既設管５の引き込み側端部６の管口から外部に引張り出される。このとき、ヘッダ１１の引張りに伴って、既設管５には到達立坑２側への引張り力Ｔ１が作用して、既設管５が到達立坑２側に移動しようとするが、この引張り力Ｔ１の反力Ｔ２が、既設管支持手段４０から第１伝達部５１、第１当接部５２の第１当接面５２ａを介して既設管５の引き込み側端部６の端面６ａに作用する。そのため、既設管５は到達立坑２側に移動しない。よって、ヘッダ１１が第１治具５０の第１治具切り欠き部５３を通過するよう、管入れ替え装置１０のワイヤ引き込み装置２０でヘッダ１１を到達立坑２側に引っ張ることにより、ヘッダ１１を、既設管５の引き込み側端部６の管口から外部に引張り出して回収することができる。   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.

また、本実施形態に係るヘッダ回収装置３０では、従来技術と異なり、ヘッダ１１を既設管５の引き込み側端部６から取り出して回収するとき、管内にヘッダが入り込んだ既設管の引き込み側端部を既設管本体から切断する作業や、補助管を既設管と接続させた後、ヘッダが入り込んだ補助管と既設管との接続を解除する作業が、全く不要である。また、作業者が、第１治具５０を既設管５の引き込み側端部６に配置して、管入れ替え装置１０のワイヤ引き込み装置２０によりヘッダ１１を到達立坑２側に引き続き引っ張るだけで、ヘッダ１１が簡単に回収でき、ヘッダ１１の回収作業が、従来の回収作業より効率良く行うことができる。また、既設管５から新設管５Ｎへの置き換え工事区間の地面ＧＬが、平坦である場合のほか、傾斜があっても、ヘッダ１１の回収ができる。   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.

また、作業者が、第１治具５０を既設管５の引き込み側端部６の端面６ａに配置し、管入れ替え装置に１０よるヘッダ１１の引張り操作をするだけで、ヘッダ１１を、既設管５の引き込み側端部６の管口から外部に取り出して回収できるため、作業者に危険を伴うこともなく安全に、ヘッダ１１を回収することができる。また、作業者は、到達立坑２内で既設管５内から回収されたヘッダ１１を地上ＧＬまで搬出するのに、ヘッダ１１単体を地上に持ち上げれば良く、作業者の運搬上の負担が、既設管の引き込み側端部等と共にこの管内に入り込んだヘッダを到達立坑内から地上に運び出していた従来技術に比べて、小さくなる。加えて、ヘッダ１１の回収時に、従来技術のように、ハンマー等の工具で既設管を叩きつけることもなく、工具による衝撃に起因して、ヘッダ１１が損傷してしまうこともない。   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.

従って、既設管５の拡径後、既設管５の引き込み側端部６の管口からヘッダ１１を、安全にかつ効率良く取り出して回収することができる、という優れた効果を奏する。   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）（５）に記載するヘッダ回収装置３０において、第１治具５０は、既設管５の引き込み側端部６の端面６ａと対向する位置に配置され、第１当接部５２の第１当接面５２ａが、引き込み側端部６の端面６ａのうち、軸方向Ｌに延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に形成された一の部分６Ｓａと当接し、第１治具切り欠き部５３が、引き込み側端部６の管内の中空部６Ｓに位置合わせして配置されることを特徴とするので、本実施形態のように、例えば、到達立坑２の近接位置に設置されるワイヤ巻き取りドラム２８に捲回されたワイヤＷを、到達立坑２から発進立坑１側に挿入しておき、拡径時にこのワイヤＷと接続したヘッダ１１を到達立坑２側に引っ張って既設管５を拡径する管入れ替え装置１０の場合には、ワイヤＷが既設管５の管内（中空部６Ｓ）を挿通している状態であっても、ワイヤＷの配線経路を、第１治具切り欠き部５３に配置することで、第１治具５０を既設管５の引き込み側端部６に取り付けることができる。 (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.

ところで、ヘッダ１１は、ヘッダ本体部１２を既設管５の内周面５ａに沿って進行方向に案内するガイドローラ１３と、既設管５をその軸方向Ｌに切断するカッタ１４と、カッタ１４により分割させた既設管５をその周方向Ｃに拡径させる円錐台状の拡径部１５と、を有して構成されている。このヘッダ１１では拡径時に、カッタ１４と拡径部１５が、その機能上、既設管５の外周より径外側にも移動経路をとって移動する。   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.

本実施形態に係るヘッダ回収装置３０では、第１治具５０の第１当接部５２の第１当接面５２ａが、埋設されている既設管５の引き込み側端部６の端面６ａのうち、円弧状に形成された一の部分６Ｓａと当接して、既設管５が、第１伝達部５１を介して、既設管支持手段４０によって支えられる。これにより、既設管５が保持された状態となり、この状態で、ヘッダ１１が、ワイヤＷによって、到達立坑２側から引っ張られると、既設管５の外周より径外側に移動経路を持つカッタ１４及び拡径部１５のほか、ガイドローラ１３等が、第１治具切り欠き部５３に向けて移動し通過することができる。よって、ヘッダ１１は、第１治具５０と干渉することなく、既設管５の引き込み側端部６の管口から外部に引張り出すことができる。   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）（５）または（６）に記載するヘッダ回収装置３０において、既設管５の引き込み側端部６の端面６ａに当接させる第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａと、到達立坑２側への引張り力Ｔ１を、第２当接部６２Ａ，６２Ｂを介して既設管支持手段４０に伝達させる第２伝達部６３Ａ，６３Ｂとを有し、ヘッダ１１で既設管５を拡径しているときに用いる第２治具６０を備えることを特徴とするので、既設管５の拡径作業は、本実施形態のように、例えば、前述したワイヤＷにより、数〜数十（ｔ）という大きな力Ｔ１でヘッダ１１を到達立坑２側に引張りながら、ヘッダ１１のカッタ１４で既設管５を軸方向Ｌに切断しつつ、切断された部分を拡径部１５で既設管５の周方向Ｃに拡げるため、既設管５の管内（中空部６Ｓ）を移動するときのヘッダ１１の摺動抵抗は非常に大きい。 (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.

そのため、ヘッダ１１をこのような大きな力Ｔ１で引っ張ると、ヘッダ１１の引張りに伴って、既設管５そのものが到達立坑２側に移動しようとする既設管５の引張り力Ｔ１が大きく作用する。このとき、第２治具６０が既設管５の引き込み側端部６に取り付けられることで、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａが、既設管５の引き込み側端部６の端面６ａに当接して、到達立坑２側に移動しようと既設管５の引張り力Ｔ１が、第２伝達部６３Ａの上側分割片支持部当接面６１Ａａ、第２伝達部６３Ｂの下側分割片支持部当接面６１Ｂａを介して既設管支持手段４０の支持部４４の支持面４４ａに作用する。既設管支持手段４０は、この引張り力Ｔ１の反力Ｔ２を既設管５の引き込み側端部６の端面６ａに向けて作用させるため、拡径作業中、既設管５は、移動しないで保持した状態にできる。そのため、既設管５の拡径時に、既設管５を固定させたまま、ワイヤＷでヘッダ１１を引っ張ることで、例示したように、数〜数十（ｔ）という大きな力（ヘッダ１１の引張り力Ｔ１）が、既設管５内のヘッダ１１にロスなく伝わり、既設管５を効率良く切断し、拡径することができる。   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）（７）に記載するヘッダ回収装置３０において、第２当接部６２Ａ，６２Ｂは、既設管５の径に対応して、既設管５端部の管内の中空部６Ｓを確保可能な環状に形成されていること、第２治具６０は、既設管５の引き込み側端部６の端面６ａと対向する位置に配置され、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａが、引き込み側端部６の端面６ａと、既設管５の軸方向Ｌに沿う方向に延びる軸線ＡＸ上に、中心を有する円環の一部をなす円弧状に当接することを特徴とするので、ワイヤ巻き取りドラム２８に捲回されたワイヤＷを、既設管５の管内のヘッダ１１と、第２当接部６２Ａ，６２Ｂの円環内の第２治具貫通部６０Ｈを通じて接続でき、第２治具６０が既設管５の引き込み側端部６に取り付けられていても、ワイヤ引き込み装置２０によりワイヤＷでヘッダを到達立坑２側に引っ張ることができる。 (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.

また、前述で例示したように、数〜数十（ｔ）という大きな力Ｔ１でヘッダ１１を引張り、既設管５に掛かる引張り力Ｔ１の反力Ｔ２が、円弧状の第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを介して、円環状の既設管５の引き込み側端部６の端面６ａに作用する。このときの反力Ｔ２が、既設管５の軸方向Ｌ発進立坑１側に沿って作用すると、既設管５が地中に埋設されている状態のまま傾くことなく、動かずに保持できる。そのため、この軸方向Ｌ発進立坑１側と正反対である軸方向Ｌ到達立坑２側に向けてヘッダ１１を軸方向Ｌに真直ぐ引っ張ると、ヘッダ１１が、既設管５の管内で、既設管５の内壁（内周面５ａ）に局部的に当たることもなくスムーズに移動できるようになる。よって、ワイヤＷによりヘッダ１１を既設管５の管内に引っ張るときに、ワイヤ引き込み装置２０において、ワイヤＷを引っ張るときに掛かる負荷をより小さく抑えて、既設管５をその軸方向Ｌに切断すると共に、切断された部分を拡径部１５で管の周方向Ｃに拡げて拡径することができる。   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）（５）乃至（８）のいずれか１つに記載するヘッダ回収装置３０において、既設管支持手段４０は、第１治具５０または第２治具６０から伝達される引張り力Ｔ１の反力Ｔ２を作用させる支持部４４を有し、支持部４４が、既設管５の軸方向Ｌに沿う方向に対し、移動可能に形成されていることを特徴とするので、既設管５の拡径にあたり、到達立坑２内に位置する既設管５の引き込み側端部６に、第２治具６０を取り付ける場合や、既設管５の拡径後、第２治具６０を取り外し、第２治具６０に代えて第１治具５０を既設管５の引き込み側端部６に取り付ける場合等に、既設管支持手段４０の支持部４４が、既設管５の引き込み側端部６から離間する向きに移動すると、作業者が、第１治具５０や第２治具６０を既設管５の引き込み側端部６に着脱させるときに、その作業がし易くなる。 (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.

一方で、既設管５の引き込み側端部６の端面６ａに第１当接部５２の第１当接面５２ａを当接させて第１治具５０を既設管５の引き込み側端部６に取り付けたら、支持部４４を既設管５の引き込み側端部６に近接する向きに移動させ、既設管支持手段４０の支持部４４の支持面４４ａと、第１治具５０の第１当接部５２の第１当接面５２ａとを当接させる。これにより、既設管５に作用する引張り力Ｔ１の反力Ｔ２が、既設管支持手段４０の支持部４４の支持面４４ａから第１治具５０の第１伝達部５１、第１当接部５２の第１当接面５２ａを介して、既設管５の引き込み側端部６の端面６ａに作用するようになる。   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.

また、既設管５の引き込み側端部６の端面６ａに、第２当接部６２Ａの上側分割片当接面６２Ａａ、及び第２当接部６２Ｂの下側分割片当接面６２Ｂａを当接させて第２治具６０を既設管５の引き込み側端部６に取り付けたら、支持部４４を既設管５の引き込み側端部６に近接する向きに移動させ、既設管支持手段４０の支持部４４の支持面４４ａと、第２治具６０において、第２伝達部６３Ａの上側分割片支持部当接面６１Ａａ、及び第２伝達部６３Ｂの下側分割片支持部当接面６１Ｂａと、を当接させる。これにより、既設管５に作用する引張り力Ｔ１の反力Ｔ２が、既設管支持手段４０の支持部４４から第２治具６０の第２伝達部６３Ａ，６３Ｂ、第２当接部６２Ａ，６２Ｂを介して、既設管５の引き込み側端部６の端面６ａに作用するようになる。   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）（９）に記載するヘッダ回収装置３０において、既設管支持手段４０は、固定されたシリンダ４１に対し、伸縮可能なロッド４３を有した油圧駆動源であり、支持部４４が、ロッド４３の先端に設けられていることを特徴とするので、到達立坑２側に移動しようとする既設管５を大きな力で安定して支えるのに、既設管支持手段４０を省スペースで構成することができ、コンパクト化した既設管支持手段４０は、スペースが狭い到達立坑２内にも設置することができる。また、例えば、第１治具５０や第２治具６０の着脱時等において、支持部４４の位置を変更したい場合に、簡単な操作でロッド４３が自在に伸縮、停止できるため、支持部４４の位置を変更するときの作業性が向上する。 (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）（５）乃至（１０）のいずれか１つに記載するヘッダ回収装置３０において、第１治具５０は平板で形成され、第１当接部５２が、第１伝達部５１の一部として配置されていると共に、第１治具切り欠き部５３が、第１当接部５２の径方向径内側に切り欠かれて形成されていることを特徴とするので、第１治具５０は、１つの平板を機械加工して安価に形成することができる。また、例えば、第１当接部５２を既設管５の引き込み側端部６の端面６ａと位置合わせして当接させた状態で、既設管５の軸方向Ｌ発進立坑１側に既設管支持手段４０の支持部４４を第１伝達部５１に押圧すること等により、第１治具５０が、既設管５の引き込み側端部６に固定して簡単に取り付けることができる。 (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.

さらに、第１当接部５２を既設管５の引き込み側端部６の端面６ａと位置合わせして当接させた状態で、第１治具５０の第１当接部５２を既設管５の引き込み側端部６に固定するだけで、ヘッダ１１が、その通過経路として、既設管５の引き込み側端部６の管内の中空部６Ｓと連通する第１治具切り欠き部５３を通じて、既設管５の引き込み側端部６の管口から外部に簡単に移動できるようになる。   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）（７）乃至（１１）のいずれか１つに記載するヘッダ回収装置３０において、第２治具６０は、既設管５の周方向Ｃに沿う方向に対し、２つに分割された上側分割片６１Ａと下側分割片６１Ｂとからなり、上側分割片６１Ａと下側分割片６１Ｂとを着脱可能で一体に形成されていることを特徴とするので、本実施形態のように、例えば、円環を２分割した分割片で、既設管５の引き込み側端部６を挟む上下に上側分割片６１Ａと下側分割片６１Ｂとを突き合わせて連結させた第２治具６０の場合、作業者が、到達立坑２内の既設管５の引き込み側端部６に第２治具６０を取り付けるとき、まず上半分の上側分割片６１Ａを既設管５の引き込み側端部６に載置し、下半分の下側分割片６１Ｂと連結させる。これにより、作業者が、到達立坑２内に入って、第２治具６０を既設管５の引き込み側端部６に取り付けるときに、第２治具６０全体を一度に持ち上げる必要がなく、第２治具６０全体の重量を分担して既設管５の引き込み側端部６に取り付けることができ、狭い到達立坑２内で、作業者に掛かる作業負担（労力）を軽減することができる。 (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.

また、前述したように、ヘッダ１１は、ヘッダ本体部１２を既設管５の内周面５ａに沿って進行方向に案内するガイドローラ１３と、既設管５をその軸方向Ｌに切断するカッタ１４と、カッタ１４により分割させた既設管５をその周方向Ｃに拡径させる円錐台状の拡径部１５と、を有して構成されている。このようなヘッダ１１では、ガイドローラ１３はヘッダ１１の先端から後端にかけて複数（本実施形態では３つ）配置され、拡径部１５はヘッダ１１の後端に配置され、カッタ１４は拡径部１５より先端側に配置されている。既設管５を挟む上下に上側分割片６１Ａと下側分割片６１Ｂとを突き合わせて連結させた第２治具６０の場合、ヘッダ１１の先端部が、到達立坑２内の既設管５の引き込み側端部６の管口に到達間近になると、カッタ１４が第２治具６０と接触する虞があるため、例えば、カッタ１４の移動経路と交わる第２治具６０の下半分の下側分割片６１Ｂだけを取り除いておき、下側分割片６１Ｂとカッタ１４との接触を防止する。その一方で、ヘッダ１１が既設管５の引き込み側端部６の管口から外部に出るまで、ヘッダ１１を到達立坑２側に引張り続けたとき、ヘッダ１１の引張り力Ｔ１に対する反力Ｔ２を、第２治具６０の上半分の上側分割片６１Ａで作用させて、既設管５の移動を阻止することができる。   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.

以上において、本発明を実施形態に即して説明したが、本発明は上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できる。
例えば、実施形態では、第２治具６０を、上側分割片６１Ａと下側分割片６１Ｂとの２分割で構成したが、第２治具６０は、例えば、単体であるほか、分割する分割片の数量は、適宜変更可能である。 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 発進立坑
２ 到達立坑
５ 既設管
５Ｎ 新設管
６ 引き込み側端部（端部）
６ａ 端面
６Ｓ 中空部
６Ｓａ 一の部分
１０ 管入れ替え装置
１１ ヘッダ
３０ ヘッダ回収装置
４０ 既設管支持手段
４１ シリンダ
４３ ロッド
４４ 支持部
５０ 第１治具
５１ 第１伝達部
５２ 第１当接部
５３ 第１治具切り欠き部（切り欠き部）
６０ 第２治具
６１Ａ 上側分割片（分割片）
６１Ｂ 下側分割片（分割片）
６２Ａ，６２Ｂ 第２当接部
６３Ａ，６３Ｂ 第２伝達部
Ｌ 軸方向
Ｃ 周方向
Ｔ１ 引張り力
Ｔ２ 反力
ＡＸ 軸線
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)

発進立坑と到達立坑との間の地中に埋設されている既設管をその軸方向に切断して拡径するヘッダを有し、前記ヘッダを、前記発進立坑から引き込まれる新設管と接続した状態で、前記到達立坑側から引っ張ることにより、拡径した前記既設管の内周側に前記新設管を引き込む管入れ替え装置と共に用いられ、
前記ヘッダの引張りに伴って、前記既設管に作用する前記到達立坑側への引張り力で、前記到達立坑側に移動しようとする前記既設管を支える既設管支持手段と、
前記到達立坑内に配置された前記既設管の端部の端面に当接させる第１当接部と、前記到達立坑側への前記引張り力を、前記第１当接部を介して前記既設管支持手段に伝達させる第１伝達部と、前記ヘッダが通り抜け可能に形成された切り欠き部、または開口部とを有し、拡径後の前記既設管から前記ヘッダを引き抜くときに用いる第１治具と、を備えるヘッダ回収装置において、
前記既設管支持手段は、前記第１治具から伝達される前記引張り力の反力を作用させる支持部を有し、前記支持部が、前記既設管の前記軸方向に沿う方向に対し、移動可能に形成されていること、
前記既設管支持手段は、固定されたシリンダに対し、伸縮可能なロッドを有した油圧駆動源を備え、前記支持部が、前記ロッドの先端に設けられていること、
前記油圧駆動源は、前記第１治具から伝達される前記引張り力の前記反力を前記支持部から前記既設管に作用させるよう、前記支持部を支えるための駆動力を発揮可能に構成されていること、
を特徴とするヘッダ回収装置。 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. 請求項１に記載するヘッダ回収装置において、
前記第１治具が、前記既設管の端部の前記端面と対向する位置に配置され、前記第１当接部が、前記端部の端面のうち、前記軸方向に延びる軸線上に、中心を有する円環の一部をなす円弧状に形成された一の部分と当接し、前記切り欠き部または前記開口部が、前記端部の管内の中空部に位置合わせして配置されること、
を特徴とするヘッダ回収装置。 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. 請求項１または請求項２に記載するヘッダ回収装置において、
前記既設管の端部の前記端面に当接させる第２当接部と、前記到達立坑側への前記引張り力を、前記第２当接部を介して前記既設管支持手段に伝達させる第２伝達部とを有し、前記ヘッダで前記既設管を拡径しているときに用いる第２治具を備えること、
を特徴とするヘッダ回収装置。 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. 請求項３に記載するヘッダ回収装置において、In the header collection | recovery apparatus described in Claim 3,
前記第２治具から伝達される前記引張り力の反力は、前記既設管支持手段の前記支持部で受けること、A reaction force of the tensile force transmitted from the second jig is received by the support portion of the existing pipe support means;
前記油圧駆動源は、前記第２治具から伝達される前記引張り力の前記反力を前記支持部から前記既設管に作用させるよう、前記支持部を支えるための駆動力を発揮可能に構成されていること、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
を特徴とするヘッダ回収装置。A header recovery device. 請求項３または請求項４に記載するヘッダ回収装置において、
前記第２当接部は、前記既設管の径に対応して、前記端部の管内の中空部を確保可能な環状に形成されていること、
前記第２治具は、前記既設管の端部の前記端面と対向する位置に配置され、前記第２当接部が、前記端部の端面と、前記既設管の前記軸方向に沿う方向に延びる軸線上に、中心を有する円環の一部をなす円弧状、または円環状に当接すること、
を特徴とするヘッダ回収装置。 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. 請求項１乃至請求項５のいずれか１つに記載するヘッダ回収装置において、
前記第１治具は平板で形成され、前記第１当接部が、前記第１伝達部の一部として配置されていると共に、前記切り欠き部が、前記第１当接部の径方向径内側に切り欠かれて形成されていること、
を特徴とするヘッダ回収装置。 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. 請求項３乃至請求項５のいずれか１つに記載するヘッダ回収装置において、
前記第２治具は、前記既設管の周方向に沿う方向に対し、複数に分割された分割片からなり、前記複数の分割片同士を着脱可能で一体に形成されていること、
を特徴とするヘッダ回収装置。 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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