JP2004016845A

JP2004016845A - Construction method for lining inside of pipe

Info

Publication number: JP2004016845A
Application number: JP2002171722A
Authority: JP
Inventors: Takuji Ikeda; 池田　卓司; Eiji Yakura; 矢倉　英司; Ichiro Muranaka; 村中　一郎
Original assignee: Osaka Gas Co Ltd
Current assignee: Osaka Gas Co Ltd
Priority date: 2002-06-12
Filing date: 2002-06-12
Publication date: 2004-01-22

Abstract

<P>PROBLEM TO BE SOLVED: To improve construction properties when an uncured resin is applied by using lining pigs to the inside of the pipe formed by connecting a large diameter pipe to a small diameter pipe. <P>SOLUTION: This construction method comprises a small diameter pipe coating step and a large diameter pipe coating step. In the small diameter pipe coating step, a stopper member 20 is arranged in the connected part C of the small diameter pipe 12 to the large diameter pipe 11 for preventing a small diameter pig 3 from rolling out to side of the pipe 11, the pig 3 is inserted until one end 12b of the pipe 12, the other end 12a side of the pipe 12 behind the pig 3 is filled with the uncured resin 7 and the resin 7 is applied to the inside of the pipe 12 by moving the pig 3 to the side of the end 12a. In the large diameter pipe coating step, a large diameter pig for applying the resin 7 to the inside of the pipe 11 is inserted until one end of the pipe 11, the other end side of the pipe 11 behind the large diameter pig is filled with the resin 7 and the resin 7 is applied to the inside of the pipe 11 by moving the large diameter pig to the side of the other end of the pipe 11. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、管内ライニング工法に関し、さらに詳しくは、大径管と小径管とを接続してある配管内に、ライニング用のピグを移動させて、前記大径管及び前記小径管の管内にライニング用の未硬化樹脂を塗布する管内ライニング工法に関する。
【０００２】
【従来の技術】
この種のライニング工法では、配管内に、ライニング用の未硬化樹脂を充填した後、ライニング用のピグを挿入し、前記ピグを配管内にて移動させることにより、配管内面に所定厚みにて前記未硬化樹脂を塗布するのであるが、大径管と小径管とを接続してある配管では、次のような不具合が生じる。
【０００３】
例えば、小径管のうち、大径管との非接続側の端部より、その小径管内に未硬化樹脂を充填した後、小径管の径に適合する小径ピグを挿入し、小径ピグを大径管側へ移動させながら、小径管内に未硬化樹脂を塗布すると、小径管と大径管との接続部にて、配管の内径が小径ピグに対し大きすぎることから、未硬化樹脂の吹き抜けなどが生じ、小径ピグを移動させることができなくなり、大径管内に未硬化樹脂を塗布できないという不具合が生じる。
また、例えば、大径管のうち、小径管との非接続側の端部より、その大径管内に未硬化樹脂を充填した後、大径管の径に適合する大径ピグを挿入し、大径ピグを小径管側へ移動させながら、大径管内に未硬化樹脂を塗布すると、小径管と大径管との接続部にて、配管の内径が大径ピグよりも小さくなることから、大径ピグを移動させることができなくなり、小径管内に未硬化樹脂を塗布できないという不具合が生じる。
【０００４】
そこで、従来、この種の大径管と小径管とを接続してある配管の管内ライニング工法では、大径管と小径管とをそれらの接続部にて切断するなどし分割して、小径管の管内に小径ピグを移動させることにより未硬化樹脂を塗布し、大径管の管内に大径ピグを移動させることにより未硬化樹脂を塗布し、そして、その後、大径管と小径管とを再接続することを行っている。
【０００５】
【発明が解決しようとする課題】
このため、従来は、大径管と小径管とを切断する作業や、また、大径管と小径管とを再接続する作業などを行う必要があり、施工性があまりよくないという問題があり、改善の余地が残されている。
【０００６】
本発明は、上記実情に鑑みてなされたものであって、その目的は、大径管と小径管とを接続してある配管内に未硬化樹脂を塗布する際の施工性を向上させることができる管内ライニング工法を提供するところにある。
【０００７】
【課題を解決するための手段】
請求項１記載の発明の特徴手段は、大径管と小径管とを接続してある配管内に、ライニング用のピグを移動させて、前記大径管及び前記小径管の管内にライニング用の未硬化樹脂を塗布する管内ライニング工法であって、
前記小径管内に前記未硬化樹脂を塗布可能な小径ピグを挿入するにあたり、前記小径ピグの前記大径管側への転出を防止するストッパー部材を、前記小径管と前記大径管との接続部に配置しておき、前記小径ピグを、前記小径管の前記接続部側の一端部まで挿入すると共に、前記小径管における前記小径ピグより他端部側に前記未硬化樹脂を充填して、前記小径ピグを前記小径管の前記他端部側に移動させることにより前記小径管の管内に前記未硬化樹脂を塗布する小径管塗布工程と、
前記大径管内で前記未硬化樹脂を塗布可能な大径ピグを、前記大径管の前記接続部側の一端部まで挿入すると共に、前記大径管における前記大径ピグより他端部側に前記未硬化樹脂を充填して、前記大径ピグを前記大径管の前記他端部側に移動させることにより前記大径管の管内に前記未硬化樹脂を塗布する大径管塗布工程とを備えるところにある。
【０００８】
〔作用効果〕
本手段によれば、配管をわざわざ小径管と大径管とに切断するなどして分割することなく、小径管及び大径管各々の管内に未硬化樹脂を塗布でき、結果、その施工性を向上させることが可能となる。
【０００９】
つまり、小径管塗布工程では、予め、前記ストッパー部材を小径管と大径管との接続部に配置しておいて、前記小径管の前記接続部側ではない方の他端部から前記接続部側の一端部に向けて、小径管用の小径ピグを挿入するので、前記ストッパー部材により、小径ピグが大径管側に転出するのを確実に防止しながら、小径ピグを移動させ、前記接続部側の一端部まで挿入させることができる。そして、このようにして小径管の一端部まで小径ピグを挿入すると共に、その小径ピグより前記接続部側ではない方の他端部側に未硬化樹脂を充填して、その小径ピグを前記接続部側ではない方の他端部側に移動させることで、小径管の管内に未硬化樹脂を塗布することができる。
【００１０】
一方、大径管塗布工程では、大径管用の大径ピグを、前記大径管の前記接続部側ではない方の他端部から前記接続部側の一端部に向けて挿入し移動させれば、、前記接続部では管の内径が大径ピグの外径よりも小さくなるので、大径ピグを前記大径管の前記接続部側の一端部まで挿入させることができる。そして、このようにして大径管の一端部まで大径ピグを挿入すると共に、その大径ピグより前記接続部側ではない方の他端部側に未硬化樹脂を充填して、その大径ピグを前記接続部側ではない方の他端部側に移動させることで、大径管の管内に未硬化樹脂を塗布することができる。
【００１１】
本手段では、このような小径管塗布工程と大径管塗布工程とを備えるので、配管をわざわざ小径管と大径管とに切断するなどして分割することなく、小径管及び大径管各々の管内に未硬化樹脂を塗布でき、結果、その施工性を向上させることができる。因みに、このような大径管と小径管とが接続される施工対象の配管が、殊に、地中に配設される既設管である場合には、大径管と小径管との接続部付近を掘削する必要がなくなり、有利である。
【００１２】
請求項２記載の発明の特徴手段は、上記請求項１の特徴手段に加えて、前記小径管塗布工程にて、前記小径管の前記接続部側の一端部まで前記小径ピグを挿入させるのに、前記小径管の他端部に挿入した前記小径ピグを、前記小径管の他端部から注入する前記未硬化樹脂によって押し込み移動させ、
前記大径管塗布工程にて、前記大径ピグを、前記大径管の前記接続部側の一端部まで挿入させるのに、前記大径管の他端部に挿入した前記大径ピグを、前記大径管の他端部から注入する前記未硬化樹脂によって押し込み移動させるところにある。
【００１３】
〔作用効果〕
本手段によれば、小径管塗布工程及び大径管塗布工程において、小径ピグと大径ピグ各々を所定位置まで挿入するにあたり、それぞれ小径管又は大径管の他端部から注入する未硬化樹脂によって小径ピグや大径ピグを押し込み移動させるので、小径ピグや大径ピグ各々の挿入作業を行いながら未硬化樹脂の充填作業も行い、作業工程の簡略化を図ることができ、好適である。
【００１４】
請求項３記載の発明の特徴手段は、上記請求項１又は２の特徴手段に加えて、前記ストッパー部材として、可撓性の線状本体の先端部に前記大径ピグを設けてあるものを用いるところにある。
【００１５】
〔作用効果〕
可撓性の線状本体の先端部に大径ピグを設けてあるストッパー部材を用いることで、ストッパー部材を、前記小径管と前記大径管との接続部に配置する作業と、大径ピグを、前記大径管の前記接続部側の一端部まで挿入する作業とを同時に行い、作業工程の簡略化を図ることができ、好適である。
【００１６】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。図１，２に、本発明に係る管内ライニング工法の一実施形態の一部断面図を示す。
【００１７】
図１，２に示すように、本発明に係る管内ライニング工法の対象となる配管１は、内径の異なる管どうしを接続してなり、内径の大きい直管状の大径管１１と内径の小さい直管状の小径管１２とを直線状に接続して形成される。尚、本実施形態では、前記大径管１１と前記小径管１２とは、その長手方向に沿って次第に径が小さくなる縮拡径材１３により接続してあるが、このような構成に限定されるものではなく、大径管１１と小径管１２とはその他各種方法により接続してあってもよい。また、本実施形態では、縮拡径材１３の箇所が、大径管１１と小径管１２との接続部Ｃに相当する。
そして、図１（イ）〜（ハ）に例示するようにして、小径管１２内に未硬化のエポキシ樹脂等の未硬化樹脂７を塗布可能な小径管１２の内径に適合する小径管用の小径ピグ３により小径管塗布工程を行い、図２（ニ）〜（ヘ）に例示するようにして、大径管１１内に未硬化樹脂７を塗布可能な大径管１１の内径に適合する大径管用の大径ピグ４により大径管塗布工程を行うことで、大径管１１及び小径管１２の管内面に未硬化樹脂７を塗布する。
【００１８】
図１（イ）に示すように、まず、ストッパー部材２０を大径管１１の接続部Ｃ側ではない方の他端部１１ａ側より接続部Ｃ内に配置しておき、球形又はほぼ球形の小径ピグ３を小径管１２の接続部Ｃ側ではない方の他端部１２ａ側より挿入する。
前記ストッパー部材２０は、一例として、小径ピグ３を受け止める拡径頭部２１と、その拡径頭部２１の後方に接続される操作本体２２とから構成してあり、操作本体２２を操作して、拡径頭部２１が接続部Ｃの所望の位置に配置され、後述するように拡径頭部２１にて小径ピグ３の移動を停止し、小径ピグ３が小径管１２より脱出するのを防止できるようにしてある。尚、前記ストッパー部材２０（拡径頭部２１や前記操作本体２２）は、小径ピグ３を受け止めその移動を停止させることができる程度の強度を備えていればよく、合成樹脂材料や金属材料など任意の材料から形成すればよい。また、操作本体２２は、棒状のものから形成してあってもよいし、または、鋼線やスプリングワイヤ等の線状のものから形成してあってもよい。
【００１９】
そして、本実施形態では、図１（イ）に示すように、小径ピグ３の他端部１２ａ側に未硬化樹脂７を注入することで、小径ピグ３を未硬化樹脂７の押し込み圧により接続部Ｃ側へと移動させ、図１（ロ）に示すように、小径ピグ３を小径管１２の接続部Ｃ側の一端部１２ｂまで挿入するのと同時に、未硬化樹脂７を充填する。この際、小径ピグ３は、接続部Ｃに配置されるストッパー部材２０の拡径頭部２１に接当することで、移動しすぎることなく停止され、小径管１２より脱出することなく、確実に、小径管１２の接続部Ｃ側の一端部１２ｂまで挿入される。
【００２０】
次に、図１（ハ）に示すように、小径管１２の接続部Ｃ側の一端部１２ｂまで挿入された小径ピグ３を他端部１２ａ側へ移動させることで、小径管１２の管内面に未硬化樹脂７が塗布される。
この際、小径ピグ３を他端部１２ａ側へ移動させるにあたっては、任意の方法を用いればよく、例えば、小径管１２の他端部１２ａ側より管内を吸引して移動させたり、また、一端部１２ｂ側から他端部１２ａ側に向かう加圧流体（空気、スチーム、水等）を供給することにより小径ピグ３を加圧して移動させたり、また、小径ピグ３に索条体等を連結し牽引して移動させるようにすればよい。
【００２１】
一方、図２（ニ），（ホ）に示すように、大径管１１の接続部Ｃ側ではない方の他端部１１ａ側より、ストッパー部材２０が取り外され、球形又はほぼ球形の大径ピグ４が前記大径管１１の他端部１１ａ側より挿入され、本実施形態では、図に示すように、大径ピグ４の前記大径管１１の他端部１１ａ側に未硬化樹脂７を注入することで、大径ピグ４が未硬化樹脂７の押し込み圧により接続部Ｃ側へと移動させ挿入されると同時に、未硬化樹脂７が充填される。この際、図２（ホ）に示すように、大径ピグ４の外径が小径管１２の内径よりも大きいことから、接続部Ｃにて大径ピグ４の移動が停止され、大径ピグ４が前記大径管１１の接続部Ｃ側の一端部１１ｂまで挿入される。
【００２２】
次に、図２（ヘ）に示すように、前記大径管１１の接続部Ｃ側の一端部１１ｂまで挿入された大径ピグ４を他端部１１ａ側へ移動させることで、大径管１１の管内面に未硬化樹脂７が塗布される。
この際、大径ピグ４を他端部１１ａ側へ移動させるにあたっては、小径ピグ３の場合と同様に任意の方法を用いればよく、例えば、大径管１１の他端部１１ａ側より管内を吸引して移動させたり、また、大径管１１の一端部１１ｂ側から他端部１１ａ側に向かう加圧流体（空気、スチーム、水等）を供給することにより大径ピグ４を加圧して移動させたり、また、大径ピグ４に索条体等を連結し牽引して移動させるようにすればよい。
【００２３】
以上のように、配管１をわざわざ大径管１１と小径管１２とに切断するなどして分割することなく、大径管１１及び小径管１２の管内面に未硬化樹脂７を塗布することができ、その施工性を向上させることができる。殊に、このような大径管１１と小径管１２とが接続される施工対象の配管１が、地中に配設される既設管である場合には、大径管１１と小径管１２との接続部Ｃ付近を掘削する必要がなくなり、有利である。
【００２４】
〔別実施形態〕
以下に他の実施形態を説明する。
〈１〉　先の実施形態では、ストッパー部材２０の一例として拡径頭部２１と操作本体２２とからなるものを説明したが、図３に例示するように、スプリングワイヤ等からなる可撓性の線状本体２６の先端部に、大径ピグ４を設けてあるものを用いれば、ストッパー部材２０を接続部Ｃに配置する作業と、大径ピグ４を、大径管１１の接続部Ｃ側の一端部１１ｂまで挿入する作業とを同時に行い、作業工程の簡略化を図ることができ、好適である。
また、ストッパー部材２０を接続部Ｃに配置するにあたっては、線状本体２６を軸方向周りに回転させながら押し込むことにより、円滑に大径ピグ４が所定位置に配置されるまで、挿入させることができる。尚、図示しないが、大径ピグ４よりも他端部１１ａ側に未硬化樹脂７を充填し、線状本体２６により大径ピグ４を牽引し他端部１１ａ側へ移動させることにより、大径管１１に未硬化樹脂７を塗布することができる。
その他は、先の実施形態と同様である。
【００２５】
〈２〉　また、先の実施形態では、小径管塗布工程及び大径管塗布工程において、小径ピグと大径ピグ各々を所定位置まで挿入するにあたり、それぞれ小径管又は大径管の他端部から注入する未硬化樹脂によって小径ピグや大径ピグを押し込み移動させる例を示したが、そのような構成に限定されるものではなく、小径ピグや大径ピグを、例えば、吸引して移動させたり、また、加圧して移動させたり、また、牽引して移動させるなどの方法により所定位置まで挿入すると共に、未硬化樹脂を充填するようにしてもよい。
【００２６】
〈３〉　先の実施形態では、小径管塗布工程を行った後に、大径管塗布工程を行う例を示したが、そのような順序に限定されるものではなく、小径管塗布工程を行いながら大径管塗布工程を行ってもよいし、また、大径管塗布工程を行った後に、小径管塗布工程を行うようにしてもよい。
【００２７】
〈４〉　先の実施形態では、配管１の一例として、直管状の大径管１１と直管状の小径管１２とを直線状に接続してあるものを示したが、例えば、大径管１１や小径管１２は各々屈曲部を有しているものでもよいし、また、大径管１１と小径管１２とを屈曲させて接続してあってもよい。
【００２８】
〈５〉　尚、本発明は、任意の用途の配管に適用することができ、配管として、例えば、排水用の配管や、上水道用の配管や、下水道の配管や、ガス供給用の配管に適用することができる。
【図面の簡単な説明】
【図１】本発明に係る管内ライニング工法の小径管塗布工程の一実施形態を示す一部断面図
【図２】本発明に係る管内ライニング工法の大径管塗布工程の一実施形態を示す一部断面図
【図３】本発明に係る管内ライニング工法の別実施形態を示す一部断面図
【符号の説明】
１　　配管
３　　小径ピグ
４　　大径ピグ
７　　未硬化樹脂
１１　大径管
１２　小径管
２０　ストッパー部材
２６　線状本体
Ｃ　　接続部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-pipe lining method, and more specifically, a lining pig is moved in a pipe connecting a large-diameter pipe and a small-diameter pipe, and the lining is moved into the large-diameter pipe and the small-diameter pipe. The present invention relates to a pipe lining method for applying an uncured resin for use in a pipe.
[0002]
[Prior art]
In this type of lining method, after filling the uncured resin for lining in the pipe, inserting a lining pig and moving the pig in the pipe, the pipe has a predetermined thickness on the inner surface of the pipe. Although the uncured resin is applied, the following problem occurs in the pipe connecting the large-diameter pipe and the small-diameter pipe.
[0003]
For example, after filling the uncured resin into the small-diameter pipe from the end of the small-diameter pipe that is not connected to the large-diameter pipe, insert a small-diameter pig that fits the diameter of the small-diameter pipe, and replace the small-diameter pig with the large-diameter pipe. If the uncured resin is applied inside the small-diameter pipe while moving to the pipe side, the blow-through of the uncured resin may occur at the connection between the small-diameter pipe and the large-diameter pipe because the inner diameter of the pipe is too large for the small-diameter pig. As a result, it becomes impossible to move the small-diameter pig, which causes a problem that the uncured resin cannot be applied in the large-diameter pipe.
Also, for example, from the large-diameter pipe, from the end on the non-connection side with the small-diameter pipe, after filling the large-diameter pipe with uncured resin, insert a large-diameter pig that fits the diameter of the large-diameter pipe, If uncured resin is applied inside the large-diameter pipe while moving the large-diameter pig to the small-diameter pipe, the inner diameter of the pipe will be smaller than the large-diameter pig at the connection between the small-diameter pipe and the large-diameter pipe. A problem arises in that the large diameter pig cannot be moved, and the uncured resin cannot be applied in the small diameter pipe.
[0004]
Therefore, in the conventional pipe lining method for connecting a large-diameter pipe and a small-diameter pipe to each other, the large-diameter pipe and the small-diameter pipe are divided by cutting them at a connection portion thereof. The uncured resin is applied by moving the small-diameter pig into the pipe of the large-diameter pipe, and the uncured resin is applied by moving the large-diameter pig into the large-diameter pipe. Going to reconnect.
[0005]
[Problems to be solved by the invention]
For this reason, conventionally, it is necessary to perform operations such as cutting the large-diameter pipe and the small-diameter pipe and re-connecting the large-diameter pipe and the small-diameter pipe, and there is a problem that the workability is not very good. There is room for improvement.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to improve workability in applying uncured resin to a pipe connecting a large-diameter pipe and a small-diameter pipe. It is to provide an in-pipe lining method.
[0007]
[Means for Solving the Problems]
The characteristic feature of the invention according to claim 1 is to move a lining pig into a pipe connecting a large diameter pipe and a small diameter pipe, and to move a lining pig into the large diameter pipe and the small diameter pipe. An in-pipe lining method for applying uncured resin,
Upon inserting the small diameter pig capable of applying the uncured resin into the small diameter pipe, a stopper member for preventing the small diameter pig from moving out to the large diameter pipe side, a connecting portion between the small diameter pipe and the large diameter pipe The small-diameter pig is inserted up to one end of the small-diameter pipe on the connection portion side, and the other end side of the small-diameter pipe is filled with the uncured resin from the small-diameter pig, A small-diameter pipe applying step of applying the uncured resin to the inside of the small-diameter pipe by moving a small-diameter pig to the other end side of the small-diameter pipe;
A large-diameter pig capable of applying the uncured resin in the large-diameter pipe is inserted up to one end of the large-diameter pipe on the connection portion side, and the other end of the large-diameter pipe is closer to the other end than the large-diameter pig. Filling the uncured resin and moving the large-diameter pig to the other end side of the large-diameter pipe to apply the uncured resin to the inside of the large-diameter pipe. There is to prepare.
[0008]
(Function and effect)
According to this means, the uncured resin can be applied to the inside of each of the small-diameter pipe and the large-diameter pipe without dividing the pipe into a small-diameter pipe and a large-diameter pipe, for example, without dividing the pipe. It can be improved.
[0009]
That is, in the small-diameter pipe coating step, the stopper member is previously arranged at the connection between the small-diameter pipe and the large-diameter pipe, and the other end of the small-diameter pipe that is not on the connection side is connected to the connection section. The small-diameter pig for the small-diameter pipe is inserted toward one end of the small-diameter pipe, so that the stopper is used to move the small-diameter pig while reliably preventing the small-diameter pig from moving out to the large-diameter pipe side. Up to one end on the side. Then, while inserting the small-diameter pig to one end of the small-diameter pipe in this manner, filling the other end side of the small-diameter pig that is not the connection portion side with the uncured resin, and connecting the small-diameter pig to the connection. The uncured resin can be applied to the inside of the small-diameter pipe by moving it to the other end side that is not the section side.
[0010]
On the other hand, in the large-diameter pipe application step, the large-diameter pig for the large-diameter pipe is inserted and moved from the other end of the large-diameter pipe that is not the connection part side to the one end part on the connection part side. For example, since the inside diameter of the pipe is smaller than the outside diameter of the large-diameter pig at the connection portion, the large-diameter pig can be inserted to one end of the large-diameter pipe on the connection portion side. Then, while inserting the large-diameter pig to one end of the large-diameter pipe in this way, filling the other end side of the large-diameter pig that is not the connection portion side with the uncured resin, and The uncured resin can be applied to the inside of the large-diameter pipe by moving the pig to the other end side other than the connection section side.
[0011]
In the present means, since such a small-diameter pipe coating step and a large-diameter pipe coating step are provided, each of the small-diameter pipe and the large-diameter pipe does not need to be divided by cutting the pipe into a small-diameter pipe and a large-diameter pipe. The uncured resin can be applied to the inside of the tube, and as a result, its workability can be improved. Incidentally, in the case where the pipe to be connected to connect such a large-diameter pipe and a small-diameter pipe is an existing pipe installed underground, a connection portion between the large-diameter pipe and the small-diameter pipe is provided. This eliminates the need for excavation in the vicinity, which is advantageous.
[0012]
According to a second aspect of the present invention, in addition to the first aspect, the small-diameter pipe is inserted into the small-diameter pipe up to one end of the small-diameter pipe on the connecting portion side in the small-diameter pipe applying step. The small diameter pig inserted into the other end of the small diameter pipe is pushed and moved by the uncured resin injected from the other end of the small diameter pipe,
In the large-diameter pipe coating step, to insert the large-diameter pig up to one end of the large-diameter pipe on the connection portion side, the large-diameter pig inserted into the other end of the large-diameter pipe, The large-diameter tube is to be pushed and moved by the uncured resin injected from the other end.
[0013]
(Function and effect)
According to this means, in the small-diameter pipe application step and the large-diameter pipe application step, when inserting each of the small-diameter pig and the large-diameter pig to a predetermined position, the uncured resin injected from the other end of the small-diameter pipe or the large-diameter pipe, respectively Since the small-diameter pig and the large-diameter pig are pushed and moved by this, the filling operation of the uncured resin is performed while the small-diameter pig and the large-diameter pig are inserted, which is preferable because the operation process can be simplified.
[0014]
According to a third aspect of the present invention, in addition to the first or second aspect, the stopper is provided with the large-diameter pig at a distal end of a flexible linear body. It is used.
[0015]
(Function and effect)
By using a stopper member provided with a large-diameter pig at a distal end portion of a flexible linear main body, an operation of disposing a stopper member at a connection portion between the small-diameter pipe and the large-diameter pipe; Is preferably performed simultaneously with the operation of inserting up to one end of the large-diameter pipe on the side of the connection portion, thereby simplifying the operation process.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a partial sectional view of an embodiment of the in-pipe lining method according to the present invention.
[0017]
As shown in FIGS. 1 and 2, a pipe 1 to be subjected to the in-pipe lining method according to the present invention is formed by connecting pipes having different inner diameters, and a straight large-diameter pipe 11 having a larger inner diameter and a straight pipe having a smaller inner diameter. It is formed by connecting the tubular small-diameter pipe 12 linearly. In the present embodiment, the large-diameter pipe 11 and the small-diameter pipe 12 are connected by a contraction / expansion material 13 whose diameter gradually decreases along the longitudinal direction. However, the present invention is not limited to such a configuration. However, the large-diameter pipe 11 and the small-diameter pipe 12 may be connected by other various methods. Further, in the present embodiment, the portion of the reduced diameter member 13 corresponds to a connection portion C between the large diameter pipe 11 and the small diameter pipe 12.
Then, as illustrated in FIGS. 1A to 1C, a small diameter for a small diameter pipe that fits the inner diameter of the small diameter pipe 12 to which the uncured resin 7 such as an uncured epoxy resin can be applied. The small-diameter pipe application step is performed by the pig 3 and, as illustrated in FIGS. 2 (D) to 2 (F), a large-diameter pipe 11 which can be coated with the uncured resin 7 in the large-diameter pipe 11 is used. The uncured resin 7 is applied to the inner surfaces of the large-diameter pipe 11 and the small-diameter pipe 12 by performing the large-diameter pipe application step using the large-diameter pig 4 for the large-diameter pipe.
[0018]
As shown in FIG. 1A, first, the stopper member 20 is arranged in the connection portion C from the other end portion 11a side of the large-diameter pipe 11 which is not the connection portion C side, and a spherical or almost spherical shape is formed. The small-diameter pig 3 is inserted from the other end 12a side of the small-diameter pipe 12 which is not the connection portion C side.
The stopper member 20 includes, for example, an enlarged head 21 that receives the small-diameter pig 3 and an operation body 22 that is connected to the rear of the enlarged head 21. The enlarged diameter head 21 is arranged at a desired position of the connection portion C, and stops the movement of the small diameter pig 3 at the enlarged diameter head 21 as described later, so that the small diameter pig 3 escapes from the small diameter pipe 12. It is designed to prevent it. The stopper member 20 (the enlarged diameter head 21 and the operation main body 22) only needs to have strength enough to receive the small-diameter pig 3 and stop its movement, such as a synthetic resin material or a metal material. What is necessary is just to form from arbitrary materials. Further, the operation main body 22 may be formed from a rod-shaped object, or may be formed from a linear object such as a steel wire or a spring wire.
[0019]
In the present embodiment, as shown in FIG. 1A, the uncured resin 7 is injected into the other end 12a side of the small-diameter pig 3 so that the small-diameter pig 3 is connected by the pressing pressure of the uncured resin 7. As shown in FIG. 1B, the small-diameter pig 3 is inserted up to one end 12b of the small-diameter tube 12 on the connection portion C side, and at the same time, the uncured resin 7 is filled. At this time, the small-diameter pig 3 is stopped without moving excessively by coming into contact with the enlarged-diameter head 21 of the stopper member 20 arranged at the connection portion C, and is surely prevented from falling out of the small-diameter pipe 12. The small-diameter tube 12 is inserted up to one end 12b on the connection portion C side.
[0020]
Next, as shown in FIG. 1C, the small-diameter pig 3 inserted into the small-diameter pipe 12 to the one end 12b on the connection portion C side is moved to the other end 12a side, whereby the inner surface of the small-diameter pipe 12 is moved. Is applied with an uncured resin 7.
At this time, any method may be used to move the small diameter pig 3 toward the other end 12a, for example, by sucking the inside of the small diameter pipe 12 from the other end 12a side and moving it. By supplying a pressurized fluid (air, steam, water, etc.) from the part 12b side to the other end part 12a side, the small-diameter pig 3 is pressurized and moved, and a cord or the like is connected to the small-diameter pig 3 What is necessary is just to pull and move it.
[0021]
On the other hand, as shown in FIGS. 2 (D) and 2 (E), the stopper member 20 is removed from the other end 11a side of the large-diameter tube 11 which is not the connection portion C side, and a spherical or substantially spherical large-diameter tube is formed. The pig 4 is inserted from the other end 11a side of the large-diameter pipe 11, and in the present embodiment, as shown in the figure, the uncured resin 7 is attached to the other end 11a side of the large-diameter pipe 11 of the large-diameter pig 4. Is injected, the large-diameter pig 4 is moved and inserted toward the connection portion C side by the pressing pressure of the uncured resin 7, and at the same time, the uncured resin 7 is filled. At this time, as shown in FIG. 2E, since the outer diameter of the large-diameter pig 4 is larger than the inner diameter of the small-diameter pipe 12, the movement of the large-diameter pig 4 is stopped at the connecting portion C, and the large-diameter pig is stopped. 4 is inserted up to one end 11b of the large-diameter tube 11 on the connection portion C side.
[0022]
Next, as shown in FIG. 2F, the large-diameter pig 4 is inserted into one end 11b of the large-diameter pipe 11 on the connection portion C side, and is moved to the other end 11a. The uncured resin 7 is applied to the inner surface of the tube 11.
At this time, in order to move the large diameter pig 4 to the other end 11a side, an arbitrary method may be used similarly to the case of the small diameter pig 3, for example, the inside of the large diameter pipe 11 is moved from the other end 11a side. The large-diameter pig 4 is pressurized by being moved by suction or by supplying a pressurized fluid (air, steam, water, etc.) from the one end 11b side of the large-diameter pipe 11 to the other end 11a side. What is necessary is just to make it move, and also to connect a cord and the like to the large-diameter pig 4 and tow it to move.
[0023]
As described above, it is possible to apply the uncured resin 7 to the inner surfaces of the large-diameter pipe 11 and the small-diameter pipe 12 without dividing the pipe 1 into the large-diameter pipe 11 and the small-diameter pipe 12 without cutting. And its workability can be improved. In particular, when the pipe 1 to be connected to which the large-diameter pipe 11 and the small-diameter pipe 12 are connected is an existing pipe disposed underground, the large-diameter pipe 11 and the small-diameter pipe 12 are connected to each other. There is no need to excavate the vicinity of the connecting portion C, which is advantageous.
[0024]
[Another embodiment]
Hereinafter, other embodiments will be described.
<1> In the above embodiment, the stopper member 20 is described as including the enlarged diameter head 21 and the operation main body 22. However, as illustrated in FIG. If a large-diameter pig 4 is provided at the distal end of the linear main body 26, the operation of disposing the stopper member 20 at the connection portion C and the large-diameter pig 4 are connected to the connection portion C side of the large-diameter pipe 11. This is preferable because the operation of inserting the one end portion 11b can be performed at the same time, thereby simplifying the operation process.
In arranging the stopper member 20 at the connection portion C, the linear body 26 is pushed in while rotating it around the axial direction, so that the large-diameter pig 4 can be smoothly inserted until it is arranged at a predetermined position. it can. Although not shown, the uncured resin 7 is filled in the other end 11a side of the large-diameter pig 4 and the large-diameter pig 4 is pulled by the linear main body 26 and moved to the other end 11a side. The uncured resin 7 can be applied to the diameter tube 11.
Others are the same as the previous embodiment.
[0025]
<2> Further, in the above embodiment, in the small-diameter pipe application step and the large-diameter pipe application step, when each of the small-diameter pig and the large-diameter pig is inserted to a predetermined position, the other end of the small-diameter pipe or the large-diameter pipe respectively Although the example in which the small-diameter pig or the large-diameter pig is pushed and moved by the uncured resin to be injected is shown, the invention is not limited to such a configuration, and the small-diameter pig or the large-diameter pig is moved, for example, by suction. Alternatively, it may be inserted to a predetermined position by a method of moving by pressurizing or moving by pulling, and may be filled with an uncured resin.
[0026]
<3> In the above embodiment, the example in which the large-diameter tube coating process is performed after the small-diameter tube coating process is performed is described. However, the order is not limited to such an order. The large-diameter tube coating process may be performed, or the small-diameter tube coating process may be performed after the large-diameter tube coating process.
[0027]
<4> In the above embodiment, as an example of the pipe 1, a straight tube-shaped large-diameter pipe 11 and a straight-tube small-diameter pipe 12 are connected in a straight line. The small-diameter pipe 12 may have a bent portion, or the large-diameter pipe 11 and the small-diameter pipe 12 may be bent and connected.
[0028]
<5> Note that the present invention can be applied to piping for any use. For example, the present invention is applied to piping for drainage, piping for water supply, piping for sewerage, and piping for gas supply. can do.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing one embodiment of a small-diameter pipe applying step of the in-pipe lining method according to the present invention. FIG. 2 is an embodiment showing one embodiment of a large-diameter pipe applying step of the in-pipe lining method according to the present invention. FIG. 3 is a partial sectional view showing another embodiment of the in-pipe lining method according to the present invention.
DESCRIPTION OF SYMBOLS 1 Piping 3 Small diameter pig 4 Large diameter pig 7 Uncured resin 11 Large diameter pipe 12 Small diameter pipe 20 Stopper member 26 Linear body C Connection part

Claims

An in-pipe lining method in which a lining pig is moved into a pipe connecting the large-diameter pipe and the small-diameter pipe, and an uncured resin for lining is applied to the large-diameter pipe and the small-diameter pipe. hand,
Upon inserting the small diameter pig capable of applying the uncured resin into the small diameter pipe, a stopper member for preventing the small diameter pig from moving out to the large diameter pipe side, a connecting portion between the small diameter pipe and the large diameter pipe The small-diameter pig is inserted up to one end of the small-diameter pipe on the connection portion side, and the other end side of the small-diameter pipe is filled with the uncured resin from the small-diameter pig, A small-diameter pipe applying step of applying the uncured resin to the inside of the small-diameter pipe by moving a small-diameter pig to the other end side of the small-diameter pipe;
A large-diameter pig capable of applying the uncured resin in the large-diameter pipe is inserted up to one end of the large-diameter pipe on the connection portion side, and the other end of the large-diameter pipe is closer to the other end than the large-diameter pig. Filling the uncured resin and moving the large-diameter pig to the other end side of the large-diameter pipe to apply the uncured resin to the inside of the large-diameter pipe. In-pipe lining method.

In the small-diameter pipe coating step, the small-diameter pig inserted into the other end of the small-diameter pipe is inserted into the other end of the small-diameter pipe to insert the small-diameter pig to one end of the small-diameter pipe on the connection portion side. Press and move by the uncured resin injected from the part,
In the large-diameter pipe coating step, to insert the large-diameter pig up to one end of the large-diameter pipe on the connection portion side, the large-diameter pig inserted into the other end of the large-diameter pipe, The in-pipe lining method according to claim 1, wherein the large-diameter pipe is pushed and moved by the uncured resin injected from the other end of the large-diameter pipe.

The in-pipe lining method according to claim 1, wherein the stopper member is a flexible linear body having the large-diameter pig provided at a distal end thereof.