JPH0396783A - Non-cut exchanging method for laid pipe - Google Patents

Abstract

PURPOSE:To facilitate the recovery of a laid pipe by providing a band body in a new pipe connected to a crushing head, pushing the crushing head into the laid pipe from its one-side end to crush the laid pipe, introducing splinters onto the band body, successively advancing the new pipe, extending the band body, and pulling the band body out of the new pipe. CONSTITUTION:A new pipe 7 is connected to the rear end of a crushing head 1, and a band body 9 is provided in the new pipe 7 in such a manner as to be capable of extending in the pipe axial direction. The crushing head 1 is pushed into a buried pipeline 15 of laid pipe from its one-side end to crush the buried pipeline. Splinters 24 are introduced on the band body 9, the new pipe 7 is successively advanced in accordance with the progress of crushing, and also the band body 9 is extended. After the band body 9 is extended, and the splinters 24 of the buried pipeline 15 are introduced thereon, the band body 9 is drawn out of the new pipe 7, and the splinters 24 are recovered. Consequent ly, the splinters of the laid pipe can be recovered without being left in the ground.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は，地中に埋設された既設管の非開削布設替え工
法に関する． 従来の技術 従来のこの種の工法においては、破砕ヘッドの後端に最
初の新管を接続し，この破砕ヘッドを埋設管路の一端に
押し込むことにより既設管を破砕して地中へ埋め込み、
破砕の進行とともに新管を順次継ぎ足している． 発明が解決しようとする課題 しかし，上記従来の工法によれば、破砕した既設管の破
片がそのまま地中に残るので、たとえば既設管が石綿管
の場合には、発癌物質の一つとされている石綿を地中に
残すことになり，好ましくないという問題点がある． そこで本発明はこのような問題点を解決し、破砕した既
設管の破片を回収できるようにすることを目的とする． 課題を解決するための手段 上記目的を達戒するため本発明は、破砕ヘッドの後端に
新管を接続し、新管内に帯状体を管軸方向に伸長可能に
設け、地中に埋設された既設管の管路の一端から破砕ヘ
ッドを押し込むことにより，前記既設管を破砕しながら
その破片を破砕ヘッドから帯状体の上に導入し、破砕の
進行にともなって新管を順次推進させるとともに帯状体
を伸長させ、ある程度の長さの帯状体を伸長させて既設
管の破片をその上に導入した後に，この帯状体を新管外
に引き出して，この帯状体の上の破片を回収するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a trenchless replacement method for existing pipes buried underground. Conventional technology In this type of conventional construction method, the first new pipe is connected to the rear end of the crushing head, and this crushing head is pushed into one end of the underground pipe to crush the existing pipe and bury it underground.
New pipes are being added one after another as the crushing progresses. Problems to be Solved by the Invention However, according to the above-mentioned conventional construction method, fragments of the existing pipes remain in the ground, which is considered to be a carcinogen, for example, if the existing pipes are made of asbestos. This has the problem of leaving asbestos underground, which is not desirable. Therefore, the purpose of the present invention is to solve these problems and make it possible to recover fragments of crushed existing pipes. Means for Solving the Problems In order to achieve the above object, the present invention connects a new pipe to the rear end of the crushing head, provides a band-shaped body within the new pipe so as to be extendable in the direction of the pipe axis, and provides a belt-shaped body that is buried underground. By pushing a crushing head through one end of the pipe of the existing pipe, the existing pipe is crushed and its fragments are introduced from the crushing head onto the strip, and as the crushing progresses, the new pipe is sequentially propelled. After stretching the band to a certain length and introducing fragments of the existing pipe onto it, pull this band out of the new pipe and collect the debris on top of this band. It is something.

作用 このようにすると、破砕ヘッドにより既設管を破砕しな
がらその破片を新管内の帯状体上に導入し、その後に帯
状体を新管外に引き出してこの帯状体上の破片を回収す
るので、既設管の破片が地中に残ることがない。したが
って，既設管が石綿管などの場合に特に有用となる． 実施例 以下、本発明の一実施例を第１図〜第６図にもとづいて
説明する． 本実施例の工法においては，第１図および第２図に示す
ような破砕ヘッド１を使用する．この破砕ヘッドｌは、
円筒状胴部２の前端にくさび形平板状の刃部３を設け，
刃部３の両側縁に破砕刃４を形或したもので、胴部２の
前端に破片取入口５が開口している． 破砕ヘッドｌを使用する際には、胴部２の後端にダミー
管６を介して新管７を接続し、刃部３の両面に高圧水噴
射用ノズル８を取り付け、さらに、第３図に示すように
、ダミー管６から新管７にわたって管内に布製の帯状体
９を管軸方向に伸長可能に布設しておく．ダミー管５は
，両端部が継手部１０を介して胴部２と新管７とに挿脱
可能に接続されている．新管７は、たとえば仮設管であ
って、ガス管などを使用する．帯状体９は、ダミー管６
の中に設けられたローラ１１に巻き掛けられて後方に延
伸し，繰出し可能に巻き取られている．１２は胴部２内
に設けたガイド部で，破片を帯状体９の上に導入するも
のである． 次に新管７への布設替え工法を詳細に説明する．まず、
第３図に示すように、地中に複数の石綿管ｌ３がギボル
ト継手１４を介して接続された既設の埋設管路１５に沿
い、一定距離をおいて発進坑ｌ６と到達坑１７とを掘削
する．発進坑１６内に推進ジャッキ１８を設けるととも
に，到達坑１７の側の地上に高圧ポンプ１９およびウイ
ンチ２０を設ける．そして、上記のように組み付けた破
砕ヘッドｌ、ダミー管６および新管７を推進ジャッキｌ
８と埋設管路ｌ５の端部との間に介装し、帯状体９の一
端部９ａを発進坑１６内に適宜固定する。そして高圧ホ
ース２ｌによりノズル８と高圧ポンプ１９とを接続し、
ウインチ２０のワイヤロープ２２を破砕ヘッド１の刃部
３の先端に接続する． 次に、高圧ボンプｌ９により高圧水２３をノズル８から
破砕ヘッド１内に向かって噴射し，ウインチ２０により
刃部３を引っ張って心出ししながら推進ジャッキｌ８に
より破砕ヘッド１を埋設管路ｌ５の一端に押し込む。破
砕ヘッド１は，破砕刃４のくさび作用により石綿管１３
およびギボルト継手ｌ４を破砕しながら前進し、石綿Ｉ
ｒＩ１３の破片２４、ギボルト継手１４の石綿セメント
およびカラー，土砂などを破片取入口５からガイド部１
２を経由して帯状体９の上に導入する．その際、高圧水
２３は破片２４などの流動性を良くして帯状体９の上へ
の導入を円滑にする．なお、第４図に示すようにギボル
ト継手１４の破片は地中に残るが，これは金属製である
ので問題はない． そして第４図に示すように，破砕の進行とともに帯状体
９を繰り出して伸長させながら、新管７を順次継ぎ足す
． 次に第５図に示すように、すべての石綿管１３を破砕し
て新管７に置き換えた後、到達坑ｌ７において破砕ヘッ
ド１およびダミー管６を新管７から取り外し，高圧ポン
プｌ９およびウインチ２０を撤去する． 最後に第６図に示すように、新管７内から帯状体９を到
達坑ｌ７内に引き出し、この帯状体９の上の破片２４、
土砂などを回収する．そして、置き換えた新管７は仮設
管であるので、これらの仮設管をその後の推進工法によ
って本来の新管に置き換える． なお，本実施例では、当初の新管７を仮設管としたが，
仮設管とせず当初から本来の新管としておくことも可能
である． 上記の工法によれば、石綿管１３の破片２４およびギボ
ルト継手１４の石綿セメント，カラーを帯状体９の上に
導入して、最後にそれらをすべて回収するので、有害な
石綿の破片が地中に残ることはなし）． 発明の効果 以上述べたように本発明によると，破砕ヘッドにより既
設管を破砕しながらその破片を新管内の帯状体上に導入
し，その後に帯状体を新管外に引き出してこの帯状体上
の破片を回収するため、既設管の破片を地中に残さずに
これを回収することができることになって，既設管が石
綿管などの場合には特に有用である．By doing this, the existing pipe is crushed by the crushing head and its fragments are introduced onto the strip inside the new pipe, and then the strip is pulled out of the new pipe and the fragments on this strip are collected. Fragments of existing pipes will not remain underground. Therefore, it is especially useful when the existing pipe is an asbestos pipe. EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 to 6. In the construction method of this embodiment, a crushing head 1 as shown in Figs. 1 and 2 is used. This crushing head l is
A wedge-shaped flat blade portion 3 is provided at the front end of the cylindrical body portion 2,
A crushing blade 4 is formed on both sides of the blade part 3, and a fragment intake port 5 is opened at the front end of the body part 2. When using the crushing head l, a new pipe 7 is connected to the rear end of the body part 2 via a dummy pipe 6, and high-pressure water injection nozzles 8 are attached to both sides of the blade part 3. As shown in the figure, a cloth strip 9 is laid in the pipe from the dummy pipe 6 to the new pipe 7 so as to be extendable in the pipe axis direction. Both ends of the dummy tube 5 are removably connected to the body 2 and the new tube 7 via a joint 10. The new pipe 7 is, for example, a temporary pipe, such as a gas pipe. The strip 9 is a dummy tube 6
It is wound around a roller 11 provided inside the holder, stretches backward, and is wound up so that it can be unwound. Reference numeral 12 denotes a guide section provided within the body section 2, which guides the fragments onto the band-shaped body 9. Next, we will explain in detail the method for replacing the cable with new pipe 7. first,
As shown in FIG. 3, a starting hole 16 and a destination hole 17 are excavated at a certain distance along the existing underground pipeline 15 in which a plurality of asbestos pipes 13 are connected via gibold joints 14 underground. do. A propulsion jack 18 is installed in the launch shaft 16, and a high-pressure pump 19 and a winch 20 are installed on the ground on the side of the arrival shaft 17. Then, the crushing head l, dummy pipe 6 and new pipe 7 assembled as described above are placed on the propulsion jack l.
8 and the end of the buried pipe l5, and one end 9a of the strip 9 is appropriately fixed in the starting shaft 16. Then, connect the nozzle 8 and the high pressure pump 19 with the high pressure hose 2l,
Connect the wire rope 22 of the winch 20 to the tip of the blade 3 of the crushing head 1. Next, high-pressure water 23 is injected from the nozzle 8 into the crushing head 1 by the high-pressure pump l9, and while the winch 20 pulls and centers the blade part 3, the crushing head 1 is moved into the buried pipe l5 by the propulsion jack l8. Push it into one end. The crushing head 1 crushes the asbestos pipe 13 by the wedge action of the crushing blade 4.
The asbestos I moves forward while crushing the
The debris 24 of the rI 13, asbestos cement, collar, earth and sand of the gibold joint 14 are removed from the debris intake 5 through the guide part 1.
2 onto the strip 9. At this time, the high-pressure water 23 improves the fluidity of the fragments 24 and the like so that they can be smoothly introduced onto the strip 9. Furthermore, as shown in Figure 4, fragments of the gibold joint 14 remain underground, but this is not a problem because it is made of metal. Then, as shown in Fig. 4, as the crushing progresses, the band 9 is fed out and stretched, and new pipes 7 are successively added. Next, as shown in FIG. 5, after all asbestos pipes 13 are crushed and replaced with new pipes 7, the crushing head 1 and dummy pipe 6 are removed from the new pipe 7 in the reaching hole l7, and the high-pressure pump l9 and winch are removed. Remove 20. Finally, as shown in FIG.
Collect soil, sand, etc. Since the replaced new pipes 7 are temporary pipes, these temporary pipes are replaced with original new pipes using the subsequent propulsion method. In addition, in this example, the original new pipe 7 was used as a temporary pipe, but
It is also possible to use the original new pipe from the beginning instead of using it as a temporary pipe. According to the above construction method, the fragments 24 of the asbestos pipe 13 and the asbestos cement and collar of the gibold joint 14 are introduced onto the strip 9 and are all collected at the end, so that harmful asbestos fragments are buried underground. ). Effects of the Invention As described above, according to the present invention, the existing pipe is crushed by the crushing head and its fragments are introduced onto the band-like body inside the new pipe, and then the band-like body is pulled out of the new pipe and placed on the band-like body. This makes it possible to collect fragments of existing pipes without leaving them underground, which is particularly useful when the existing pipes are asbestos pipes.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の工法に使用する破砕ヘッドの部分断面
図，第２図は第１図の破砕ヘッドの右側面図、第３図〜
第６図は本発明の工法の一実旅例を示す工程図である。 １・・・破砕ヘッド，７・・・新管、９・・・帯状体、
１３・・・石綿管、ｌ５・・・埋設管路（既設管），２
４・・・破片。 第５図 第６図Figure 1 is a partial sectional view of the crushing head used in the method of the present invention, Figure 2 is a right side view of the crushing head in Figure 1, and Figures 3-
FIG. 6 is a process diagram showing an example of the construction method of the present invention. 1... Crushing head, 7... New pipe, 9... Band-shaped body,
13... Asbestos pipe, l5... Buried pipe (existing pipe), 2
4...Fragments. Figure 5 Figure 6

Claims (1)

【特許請求の範囲】[Claims] １、破砕ヘッドの後端に新管を接続し、新管内に帯状体
を管軸方向に伸長可能に設け、地中に埋設された既設管
の管路の一端から破砕ヘッドを押し込むことにより、前
記既設管を破砕しながらその破片を破砕ヘッドから帯状
体の上に導入し、破砕の進行にともなって新管を順次推
進させるとともに帯状体を伸長させ、ある程度の長さの
帯状体を伸長させて既設管の破片をその上に導入した後
に、この帯状体を新管外に引き出して、この帯状体の上
の破片を回収することを特徴とする既設管の非開削布設
替え工法。1. By connecting a new pipe to the rear end of the crushing head, installing a strip inside the new pipe so that it can extend in the pipe axis direction, and pushing the crushing head from one end of the existing pipe buried underground, While crushing the existing pipe, its fragments are introduced from the crushing head onto the band-shaped body, and as the crushing progresses, the new pipe is sequentially propelled and the band-shaped body is elongated to a certain length. This trenchless replacement method for existing pipes is characterized by introducing fragments of the existing pipe onto the existing pipe, then pulling this band-like body out of the new pipe, and collecting the fragments on the band-like body.