JP4331818B2

JP4331818B2 - Rehabilitation method for existing pipe having straight pipe part and curved part and connecting member for belt-like body

Info

Publication number: JP4331818B2
Application number: JP12234499A
Authority: JP
Inventors: 康北山; 直機北橋
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 1998-08-10
Filing date: 1999-04-28
Publication date: 2009-09-16
Anticipated expiration: 2019-04-28
Also published as: JP2000254970A

Description

【０００１】
【発明の属する技術分野】
本発明は、上下水道管及びガス管等の老朽化した既設管の更正工法に関し、特に、直管部と湾曲部を有する既設管の更正工法に関する。
【０００２】
【従来の技術】
上下水道及びガス管等として使用される既設管には、古くから金属管やヒューム管が使用されている。このような既設管は、長期の使用によって老朽化し、割れや腐食により漏水するおそれがある。このため、最近では、老朽化した埋設管等の既設管内に合成樹脂管を挿入してライニングすることが行われている。
【０００３】
例えば、特公平３−４８３９２号公報に記載されているように、既設管のライニング工法の一つに合成樹脂製の帯状体を螺旋状に巻回することにより形成される螺旋管によって既設管をライニングする方法が知られている。この方法では、既設管ライニング用の帯状体螺旋状に巻回して、螺旋状に巻回された帯状体の隣接する側縁部同士を係合状態とすることにより螺旋管を製造し、製造された螺旋管を既設管内に挿入することにより既設管内面を螺旋管によってライニングするようになっている。
【０００４】
上記既設管ライニング用帯状体では、例えば湾曲した既設管に沿って螺旋管を挿通させる場合には、既設管内周面が螺旋管と接触することにより、螺旋管に大きな抵抗力が作用する。このために、螺旋管に順次帯状体が送給されることにより、螺旋管を構成する帯状体に螺旋方向への推進力が作用して、螺旋管には拡径するように力が加わる。これにより、螺旋管を構成している帯状体の幅方向に大きな引張力が作用し、その引張力により帯状体の各側縁部同士の係合状態が解除されて、螺旋管が破損するおそれがある。
【０００５】
特に螺旋管が挿入される下水管が湾曲している場合には、下水管内へ挿入される螺旋管が湾曲部分に到達すると、下水管内周面と螺旋管先端部外周面とが接触して、螺旋管には大きな抵抗力が加わる。そして、螺旋管が下水管に沿って湾曲することにより、螺旋管を構成している帯状体には、幅方向に引張力が作用する。
【０００６】
そこで、上記の問題を解決するため、特開平８−７５０４２号公報に記載されているように、帯状体同士をジョイナーで接続し、ジョイナーに伸縮機能を持たせる手段が提案されている。
【０００７】
即ち、図１９に示すように、帯板状（イ）（イ）間に軟質塩化ビニル樹脂製のジョイナー（ロ）を設け、ジョイナー（ロ）の突条（ハ）を帯板状（イ）の凹溝（ニ）に挿入することにより帯板状（イ）（イ）同士を結合して螺旋管を構成し、ジョイナー（ロ）の屈曲変形部（ホ）の変形により既設管（へ）の湾曲に対応できるようにしたものである。
【０００８】
【発明が解決しようとする課題】
しかしながら、上記の螺旋管は、既設管の湾曲の曲率が大して大きくない場合には有効であるが、既設管の湾曲の曲率が大きくなると、帯板状の幅を小さくする必要があり、幅の小さな帯板状を使用する結果、施工効率の低下が免れない欠点があった。
【０００９】
本発明は上記の従来の既設管の更生工法における課題に着目してなされたものであり、その目的とするところは、従来の既設管の更生工法における課題を解決し、直管部と湾曲部を有する既設管の湾曲部の湾曲の曲率が大きくなっても、帯板状の幅を小さくする必要はなく、施工効率の低下の恐れのない直管部と湾曲部を有する既設管の更生工法を提供することを目的とする。
【００１０】
【課題を解決するための手段】
請求項１記載の本発明の直管部と湾曲部を有する既設管の更生工法は、幅方向の両端部に接合部が形成されている既設管ライニング用の帯状体を既設管内に挿入する工程と、帯状体を既設管内において螺旋状に巻回し、隣接する帯状体の接合部同志を相互に嵌合することにより螺旋管とする工程とを含む既設管の更生工法であって、直管部と湾曲部を有する既設管の直管部内に帯状体を挿入し、帯状体を直管部内において螺旋状に巻回し螺旋管とする工程と、直管部と湾曲部との境界部付近において、直管部における螺旋管の帯状体を切断する工程と、既設管の湾曲部に幅方向へ伸長し得るように形成された伸縮部を有する湾曲部用の帯状体を挿入し、湾曲部用の帯状体を螺旋状に巻回し螺旋管とする工程と、直管部における螺旋管の帯状体の切断端と湾曲部の螺旋管の湾曲部用の帯状体の端部とを接続する工程とを含むことを特徴とするものである。
【００１１】
又、請求項２記載の本発明の直管部と湾曲部を有する既設管の更生工法は、幅方向の両端部に接合部が形成されている既設管ライニング用の帯状体を既設管内に挿入する工程と、帯状体を既設管内において螺旋状に巻回し、隣接する帯状体の接合部同志を相互に嵌合することにより螺旋管とする工程とを含む既設管の更生工法であって、直管部と湾曲部を有する既設管の湾曲部に幅方向へ伸長し得るように形成された伸縮部を有する湾曲部用の帯状体を挿入し、湾曲部用の帯状体を螺旋状に巻回し螺旋管とする工程と、湾曲部における螺旋管の帯状体を切断する工程と、湾曲部と直線部との境界部付近において、
湾曲部における螺旋管の帯状体の切断端と直線部の螺旋管の湾曲部用の帯状体の端部とを接続する工程と、既設管の直管部内に帯状体を挿入し、帯状体を直管部内において螺旋状に巻回し螺旋管とする工程とを含むことを特徴とするものである。
【００１２】
又、請求項３記載の本発明の直管部と湾曲部を有する既設管の更生工法は、請求項１又は請求項２記載の直管部と湾曲部を有する既設管の更生工法において、直管部内に形成した螺旋管を拡径させる工程と、湾曲部内に形成した螺旋管を拡径させる工程とを包むことを特徴とするものである。
【００１３】
又、請求項４記載の本発明の直管部と湾曲部を有する既設管の更生工法は、請求項１乃至請求項３のいずれか１項記載の直管部と湾曲部を有する既設管の更生工法において、既設管ライニング用の帯状体が幅方向の両端部に接合部が形成されている主帯状部材と、螺旋状に巻回された際に隣接する主帯状部材の接合部と嵌合する嵌合部材とからなることを特徴とするものである。
【００１５】
本発明において、帯状体は、塩化ビニル樹脂、ポリエチレン、ポリプロピレン、ポリカーボネート、ポリエステル、或いは、これらの樹脂をガラス繊維で補強した所謂ＦＲＴＰ等の材料により、押出成形等により一体成形される。
【００１６】
本発明において、伸縮部を有する湾曲部用の帯状体としては、幅方向に「波形」や「山形」等の湾曲した形状部分を有するものとか、スライド機構が設けられたもの等、幅方向に伸縮し得るように形成された伸縮部を備えたものが使用できる。伸縮部の大きさは特に限定されず、ライニングすべき既設管の内径、曲げ角度、帯状体の材料強度等によって適宜選定すればよく、例えば既設管の内径５００ｍｍ、曲げ角度１０度の場合には、図６に示すように、高さ（ｈ）１２ｍｍ、肉厚（ｔ）２ｍｍ（基板と同様）、半径（Ｒ）４ｍｍ程度が適当である。湾曲部用の帯状体に設けられる伸縮部の個数は１個でもよく複数個でもよい。
【００１７】
本発明においは、既設管の直管部と湾曲部との境界部付近において、直管部内の螺旋管の帯状体の切断端と湾曲部内の螺旋管の帯状体の端部との接続する箇所は、直管部内の螺旋管の帯状体の切断端と湾曲部内の螺旋管の帯状体の端部とに引張力を大して受けない箇所、即ち、直管部と湾曲部との境界部付近において湾曲部の若干手前が好ましい。例えば、口径１０００ｍｍの螺旋管の場合には、湾曲部の５０ｃｍ〜１ｍ程度手前が好ましい。
【００１８】
直管部内の螺旋管の帯状体の切断端と湾曲部内の螺旋管の帯状体の端部との接続する手段としては、特に限定されないが、例えば、バット融着してもよく、或いは、一方に受け部を設け、他方を受け部に差し込んで接合するようにしてもよく、境界部材の両側に短杆状挿入部材が設けられた接続部材を使用し、接続部材の短杆状挿入部材を帯状体の補強リブ間に挿入するようにしてもよい。
【００１９】
直管部内の螺旋管の帯状体と湾曲部内の帯状体との断面形状の違いによる開口部が生じる場合には、開口部をエポキシ系接着剤等により充填して閉塞すればよい。
【００２０】
既設管の湾曲部が終了した箇所から再度直管部が存在する場合には、湾曲部と直管部との境界部付近において、湾曲部内の螺旋管の帯状体を切断し、切断端に直管部内の螺旋管の帯状体を接続し、同様に直管部内を帯状体による螺旋管により直管部をライニング施工すればよい。
【００２１】
請求項５記載の接続部材の材質としては、硬質塩化ビニル樹脂、ポリエチレン、ポリプロピレン、ポリカーボネート等の合成樹脂やステンレス鋼、アルミニウム、銅等の金属が使用できる。
【００２２】
（作用）
請求項１記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、直管部と湾曲部を有する既設管の直管部内に帯状体を挿入し、帯状体を直管部内において螺旋状に巻回し螺旋管とする工程と、直管部と湾曲部との境界部付近において、直管部における螺旋管の帯状体を切断する工程と、既設管の湾曲部に幅方向へ伸長し得るように形成された伸縮部を有する湾曲部用の帯状体を挿入し、湾曲部用の帯状体を螺旋状に巻回し螺旋管とする工程と、直管部における螺旋管の帯状体の切断端と湾曲部の螺旋管の湾曲部用の帯状体の端部とを接続する工程とを含むものであるから、湾曲部においては、帯状体に引張力が作用しても、湾曲部用主帯状部材の各伸縮部が幅方向へと広がった状態になり、湾曲部用主帯状部材が幅方向へと伸長して帯状体に作用する引張力が吸収される。その結果、既設管を湾曲部の湾曲の曲率が大きい場合にも各伸縮部の変形により対応できる。
【００２３】
請求項２記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、直管部と湾曲部を有する既設管の湾曲部に幅方向へ伸長し得るように形成された伸縮部を有する湾曲部用の帯状体を挿入し、湾曲部用の帯状体を螺旋状に巻回し螺旋管とする工程と、湾曲部における螺旋管の帯状体を切断する工程と、湾曲部と直線部との境界部付近において、湾曲部における螺旋管の帯状体の切断端と直線部の螺旋管の湾曲部用の帯状体の端部とを接続する工程と、既設管の直管部内に帯状体を挿入し、帯状体を直管部内において螺旋状に巻回し螺旋管とする工程とを含むものであるから、湾曲部においては、帯状体に引張力が作用しても、湾曲部用主帯状部材の各伸縮部が幅方向へと広がった状態になり、湾曲部用主帯状部材が幅方向へと伸長して帯状体に作用する引張力が吸収される。その結果、既設管を湾曲部の湾曲の曲率が大きい場合にも各伸縮部の変形により対応できる。
【００２４】
又、請求項３記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、直管部内に形成した螺旋管を拡径させる工程と、湾曲部内に形成した螺旋管を拡径させる工程とを包むものであるから、既設管の直管部内はもとより湾曲部内をも断面縮小の少ないライニングを行うことができる。
【００２５】
又、請求項４記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、既設管ライニング用の帯状体が幅方向の両端部に接合部が形成されている主帯状部材と、螺旋状に巻回された際に隣接する主帯状部材の接合部と嵌合する嵌合部材とからなるものであるから、嵌合部材の幅を拡大することにより帯状体の幅を拡大することができる。
【００２７】
【発明の実施の形態】
本発明の実施の形態を図面をもって詳細に説明する。
図１（ａ）（ｂ）（ｃ）は、本発明更生工法の一実施態様を工程順に示す説明図である。
【００２８】
図１（ａ）において、Ｐは本発明更生工法により更生される既設管であり、Ｐ１は既設管Ｐの直管部、Ｐ２は湾曲部、Ｐ３は直管部である。
Ｒ１は直管部Ｐ１内に設けられた螺旋管であり、螺旋管Ｒ１は図２に示す既設管ライニング用帯状体１を螺旋状に巻回し、隣接する帯状体１の接合部同士が接合されることにより形成されている。
図２に示す既設管ライニング用の帯状体１は塩化ビニル樹脂を使用して押出成形法により製せられたものであり、帯板状の基板１１の両側端から適当な距離を隔てて一方の接合部である凸条１２と他方の接合部である凹条１３が設けられ、凸条１２は支柱部１２１と先端の断面半円形の挿入部１２２とからなり、凹条１３は断面半円形状に形成された被挿入部１３１とフランジ部１３２とからなる。基板１１の中央部には２本のＴ形補強リブ１４が立設されている。
【００２９】
被挿入部１３１付近に段部１５が設けられ、段部１５の開始部から被挿入部１３１の中心迄の距離Ｌ２は基板１１の一端から凸条１２の中心までの距離Ｌ１とほぼ等しくされ、帯状体１を巻回し、隣り合う２本の帯状体１、１の一方の帯状体１の凸条１２を他方の帯状体１の凹条１３に挿入した場合に、凸条１２が設けられた一端付近が段部１５に嵌合されるようになっている。
【００３０】
本発明工法においては、図１（ａ）に示すように、図２に示す既設管ライニング用帯状体１を螺旋状に巻回し、隣接する帯状体１、１の一方の帯状体１の凹条１３の被挿入部１３１内に他方の帯状体１の凸条１２を挿入嵌合することによりライニング管Ｒ１を構成する。
【００３１】
本発明更生工法においては、図１（ａ）に示すように、既設管Ｐの直管部Ｐ１内に螺旋管Ｒ１を設けた後、図１（ｂ）に示すように、既設管Ｐの直管部Ｐ１と湾曲部Ｐ２との境界部付近において、螺旋管Ｒ１の帯状体１の端部を切断し、湾曲部Ｐ２に湾曲部用の帯状体２を挿入し、螺旋管Ｒ１の帯状体１の切断端に螺旋管Ｒ２の湾曲部用の帯状体２の端部と接合する。
【００３２】
即ち、螺旋管Ｒ２は図３に示す湾曲部用の帯状体２を螺旋状に巻回し、隣接す帯状体２、２の接合部同士を接合することにより構成する。
【００３３】
図３に示す湾曲部用の帯状体２は塩化ビニル樹脂を使用して押出成形法により製せられたものであり、帯板状２の基板２１の両側端から適当な距離を隔てて一方の接合部である凸条２２と他方の接合部である凹条２３が設けられ、凸条２２は支柱部２２１と先端の断面半円形の挿入部２２２とからなり、凹条２３は断面半円形状に形成された被挿入部２３１とフランジ部２３２とからなる。基板１１の中央部には２本のＴ形補強リブ２４が立設されると共に山形に屈曲した伸縮部２５が設けられている。
【００３４】
被挿入部２３１から伸縮部２５付近に段部２６が設けられ、伸縮部２５から被挿入部２３１の中心迄の距離Ｌ４は基板２１の一端から凸条２２の中心までの距離Ｌ３とほぼ等しくされ、帯状体２を巻回し、図４に示すように、隣り合う２本の帯状体２、２の一方の帯状体２の凸条２２を他方の帯状体２の凹条２３に挿入した場合に、凸条２２が設けられた一端付近が段部２６に嵌合されるようになっている。
【００３５】
螺旋管Ｒ２は図３に示す湾曲部用の帯状体２を螺旋状に巻回し、隣接する帯状体２、２の一方の帯状体２の凸条２２を他方の帯状体２の凹条２３に挿入することにより隣接する帯状体２、２同士が接合されて形成されている。
【００３６】
螺旋管Ｒ１の帯状体１の切断端に螺旋管Ｒ２の湾曲部用の帯状体２の端部と接合は、図５に示す接続部材３を使用する。図５に示す接続部材３は硬質塩化ビニル樹脂製の境界部材３１の両側に短杆状挿入部材３２が突設されて構成されている。境界部材３１は帯状体２の断面形状と似た形状であって、帯状体２の中央部のＴ形補強リブ２４を除いた形状を備えている。
【００３７】
螺旋管Ｒ１の帯状体１の端部と螺旋管Ｒ２の湾曲部用の帯状体２の端部とは接続部材３の挿入部材３２、３２の一端を帯状体１の凸条１３と補強リブ１４の間及び２本の補強リブ１４、１４の間に挿入し、挿入部材３２、３２の他端を螺旋管Ｒ２の湾曲部用の帯状体２の伸縮部２５の壁と補強リブ２４の間及び２本の補強リブ２４、２４の間に挿入することにより接続される。
【００３８】
螺旋管Ｒ１の帯状体１の端部と螺旋管Ｒ２の湾曲部用の帯状体２の端部との間には接続部材３の境界部材３１が挟まれる。境界部材３１は帯状体２の断面形状と似た形状であるので、殆ど目立たない。
【００３９】
本発明更生工法においては、図１（ｂ）に示すように、既設管Ｐの湾曲部Ｐ２内に螺旋管Ｒ２を設けた後、図１（ｃ）に示すように、既設管Ｐの湾曲部Ｐ２と直管部Ｐ３との境界部付近において、螺旋管Ｒ２の湾曲部用の帯状体２の余剰端部を切断し、切断端に螺旋管Ｒ３の帯状体１の端部とを接続する。
【００４０】
螺旋管Ｒ３は螺旋管Ｒ１と同様に図２に示す既設管ライニング用帯状体１を螺旋状に巻回し、隣接する帯状体１、１の一方の帯状体１の凸条１２を他方の帯状体１の凹条１３に挿入することにより接合して構成する。
【００４１】
螺旋管Ｒ２の湾曲部用の帯状体２の端部と螺旋管Ｒ３の帯状体１の端部との接続は図５に示す接続部材３を使用する。
【００４２】
図に示す本発明の更生工法においては、叙上のように、既設管Ｐの直管部Ｐ１と湾曲部Ｐ２との境界部付近において、ライニング管Ｒ１の螺旋管Ｒ１の帯状体１を切断し、切断端に伸縮部２５を有する湾曲部用の帯状体２を接続し、湾曲部Ｐ２においては、湾曲部用の帯状体２を螺旋状に巻回し、隣接する帯状体２、２の一方の帯状体２の凹条２３内に他方の帯状体２の凸条２３を挿入嵌合することによりに螺旋管Ｒ２とするものであるから、湾曲部Ｐ２においては、帯状体２に引張力が作用しても、帯状体２の各伸縮部２５が幅方向へと広がった状態になり、帯状体２が幅方向へと伸長して帯状体１に作用する引張力が吸収される。その結果、既設管Ｐの湾曲部Ｐ２の湾曲の曲率が大きい場合にも各伸縮部２５の変形により対応できる。
尚、本発明工法において、帯状体１、２を巻回する方法は、特開平６−１４３４２０号公報記載の方法によればよい。
【００４３】
図６は湾曲部用の帯状体の他の一例を示す断面図であり、図６に示す帯状体２ａはＴ形補強リブ２４の他に断面逆Ｌ形の補強リブ２４ａ、２４ａが立設され、補強リブ２４ａ、２４ａ間には断面Ｗ形の鋼製補強材２４１が挿入されている。
【００４４】
図７は湾曲部用の帯状体の他の一例を示す断面図であり、図７に示す帯状体２ｂにおいては、屈曲された伸縮部の代わりにスライド可能な伸縮部が設けられたものである。即ち、帯状体２ｂは２枚の部材２１１、２１２とからなり、一方の部材２１１の一端には矢形の挿入部２１３が設けられ、他方の部材２１２の一端には二股状嵌合部２１４が設けられ、嵌合部２１４の開口部内側に抜け止め２１５が突設されている。伸縮部は二股状嵌合部２１４内に挿入部２１３がスライド可能に挿入されて構成されている。
【００４５】
図８は接続部材の他の一例を示す斜視図である。図８に示す接続部材４ａにおいては、挿入部材４２の両端にテーパー部４２１を設けて挿入し易いようになっているものである。挿入部材４２には抜け止め防止のゴムバンドを嵌めてもよい。
【００４６】
図９は、既設管Ｐの直管部Ｐ１、Ｐ３の螺旋管Ｒ１、Ｒ３に使用する帯状体の他の一例を示す断面図である。図９に示す帯状体１ａにおいては、主帯状部材１１ａと嵌合部材１２ａとからなる。
主帯状部材１１ａは図１０に拡大して示すように、帯板状の基板１１１の両側端から適当な距離を隔てて接合部である凹条１１２が設けられ、凹条１１２は断面半円形状に形成された被挿入部１１２１とフランジ部１１２２とからなる。基板１１の中央部には２本の逆Ｌ形補強リブ１１３、１１３が立設され、補強リブ１１３、１１３間には断面Ｗ形の鋼製補強材１１３１が挿入されている。被挿入部１１２１付近に段部１１６が設けられている。
【００４７】
嵌合部材１２ａは図１１に拡大して示すように、基板１２１の両側端から適当な距離を隔てて２条の凸条１２２、１２２が立設されている。凸条１２２は支柱部１２２１と、支柱部１２２１の先端に配設された断面半円形の挿入部１２２２とからなる。基板１２１の中央部には補強リブ１２３が立設されている。１２４は基板１２１の上面に貼着されたシール材である。
【００４８】
図９に示す帯状体１ａにより螺旋管とするには、主帯状部材１１ａを湾曲し、主帯状部材１１ａの凹条１１２内に嵌合部材１２ａの凸条１２２を挿入することにより形成する。
【００４９】
図１２は、既設管Ｐの直管部Ｐ１、Ｐ３の螺旋管Ｒ１、Ｒ３に使用する帯状体の更に異なる他の一例を示す断面図である。図１２に示す帯状体１ｂにおいては、図１０に示す主帯状部材１１ａと図１３に示す嵌合部材１２ｂとからなる。
図１３にすように、嵌合部材１２ｂは幅広の基板１２１の中央部には２本の補強リブ１２３、１２３が立設されている以外は図１１に示す嵌合部材１２ａと同様であるので、その他の部分の説明を省略する。
【００５０】
図１４は既設管Ｐの湾曲部Ｐ２の螺旋管Ｒ２に使用する帯状体の他の一例を示す断面図である。
図１４に示す帯状体２ａは図１５に示す主帯状部材２１ａと図１１に示す嵌合部材１２ａとから構成されている。
【００５１】
図１５に示す主帯状部材２１ａは帯板状の基板２１１の両側端付近の凹条２１２と逆Ｌ形補強リブ２１３との間に基板２１１を屈曲することにより形成した伸縮部２１３が設けられている以外は図１０に示す主帯状部材１１ａと同様であるので、その他の部分の説明を省略する。
【００５２】
図１６は既設管Ｐの湾曲部Ｐ２の螺旋管Ｒ２に使用する帯状体の更に異なる他の一例を示す断面図である。
図１６に示す帯状体２ｂは図１５に示す主帯状部材２１ａと図１７に示す嵌合部材１２ｃとからなる。
【００５３】
図１７に示す嵌合部材１２ｃは基板１２１の中央部に立設された補強リブ１２３の先端に断面三角状の頭部１２３１が設けられている以外は図１１に示す嵌合部材１２ａと同様であるので、その他の部分の説明を省略する。
【００５４】
図１８（ａ）〜（ｈ）は、本発明更生工法の他の一実施態様を工程順に示す説明図である。
図１８（ａ）〜（ｈ）において、Ｐは本発明工法により更生される既設管であり、Ｐ１は既設管Ｐの直管部、Ｐ２は湾曲部、Ｐ３は直管部である。
【００５５】
まず、図１８（ａ）に示すように、既設管Ｐの直管部Ｐ１内にて、図２に示す既設ライニング用帯状体１を供給しつつ螺旋状に巻回しつつ、自走式製管機５を隣接する帯状体１の接合部間にまたがるように周回させて、その接合部同士を接合させることにより、既設管Ｐの直管部Ｐ１の内径よりも若干小さい外径を有する螺旋管を形成する。
【００５６】
次に、図１８（ｂ）に示すように、自走式製管機５の周回を一旦停止させ、その自走式製管機５に帯状体１のみを強制供給することにより、自走式製管機５に極く近接する部分を残して、既設管Ｐの直管部Ｐ１の内径と同じ外径を有するまで拡径させるようにして、拡径した螺旋管Ｒ１′を形成して、既設管Ｐの直管部Ｐ１内に密接させる。
【００５７】
次に、１８（ｃ）に示すように、既設管Ｐの湾曲部Ｐ２の境界部の手前約５０ｃｍ〜１ｍの地点にて、帯状体１の端部を切断し、図３に示す湾曲部用の帯状体２を供給して接続し、設管Ｐの湾曲部Ｐ２内にて、帯状体２を供給しつつ螺旋状に巻回しつつ、自走式製管機５を隣接する帯状体２の接合部間にまたがるように１〜２回周回させて、その接合部同士を接合させることにより、既設管Ｐの湾曲部Ｐ２の内径よりも若干小さい外径を有する螺旋管を形成する。
【００５８】
次に、図１８（ｄ）に示すように、自走式製管機５の周回を一旦停止させ、その自走式製管機５に帯状体２のみを強制供給することにより、自走式製管機５に極く近接する部分を残して、既設管Ｐの直管部Ｐ２の内径と同じ外径を有するまで拡径させるようにして、１〜２周回分の拡径した螺旋管Ｒ２′を形成して、既設管Ｐの湾曲部Ｐ２内に密接させていく。
【００５９】
１〜２周回分の拡径した螺旋管Ｒ２′を形成するのは、湾曲部の拡径時に管に偏芯した力が働くために、拡径部を短く確保しながら行う方が十分に拡径できるからである。
同様にして、図１８（ｅ）及び図１８（ｆ）に示すように、順次拡径した螺旋管Ｒ２′を形成して、既設管Ｐの湾曲部Ｐ２内に密接させていく。
【００６０】
次に、１８（ｇ）に示すように、既設管Ｐの湾曲部Ｐ２の境界部の後方約１ｍの地点にて、帯状体２の端部を切断し、図２に示す直管部用の帯状体１を供給して接続し、設管Ｐの直管部Ｐ３内にて、帯状体１を供給しつつ螺旋状に巻回しつつ、自走式製管機５を隣接する帯状体１の接合部間にまたがるように周回させて、その接合部同士を接合させることにより、既設管Ｐの直管部Ｐ３の内径よりも若干小さい外径を有する螺旋管を形成する。
【００６１】
更に、図１８（ｈ）に示すように、自走式製管機５の周回を一旦停止させ、その自走式製管機５に帯状体１のみを強制供給することにより、自走式製管機５に極く近接する部分を残して、既設管Ｐの直管部Ｐ３の内径と同じ外径を有するまで拡径させるようにして、拡径した螺旋管Ｒ３′を形成して、既設管Ｐの湾曲部Ｐ３内に密接させる。
【００６２】
上記の例では、小さめの螺旋管の形成とその拡径を逐次行ったが、同時に行うようにしてもよい。同時に行う場合には、自走式製管機５の周回線速度よりも帯状体の供給速度を若干速くなるようにするとよい。
以上説明したように、この実施ょ形態の場合には、既設管の直管部内はもとより湾曲部内をも拡径した螺旋管により断面縮小の少ないライニングを行うことができる。
【００６３】
以上、本発明の実施の形態を図により説明したが、本発明の具体的な構成は図示の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲の設計変更は本発明に含まれる。
【００６４】
【発明の効果】
請求項１記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、湾曲部において、帯状体に引張力が作用しても、湾曲部用主帯状部材の各伸縮部が幅方向へと広がった状態になり、湾曲部用主帯状部材が幅方向へと伸長して帯状体に作用する引張力が吸収される。その結果、既設管を湾曲部の湾曲の曲率が大きい場合にも各伸縮部の変形により対応できる。従って、既設管の湾曲部の湾曲の曲率が大きくなっても、帯板状の幅を小さくする必要はなく、施工効率の低下の恐れはない。
【００６５】
又、請求項２記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、湾曲部において、帯状体に引張力が作用しても、湾曲部用主帯状部材の各伸縮部が幅方向へと広がった状態になり、湾曲部用主帯状部材が幅方向へと伸長して帯状体に作用する引張力が吸収される。その結果、既設管を湾曲部の湾曲の曲率が大きい場合にも各伸縮部の変形により対応できる。従って、既設管の湾曲部の湾曲の曲率が大きくなっても、帯板状の幅を小さくする必要はなく、施工効率の低下の恐れはない。
【００６６】
又、請求項３記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、既設管の直管部内はもとより湾曲部内をも拡径した螺旋管により断面縮小の少ないライニングを行うことができる。
【００６７】
又、請求項４記載の本発明の直管部と湾曲部を有する既設管の更生工法においては、嵌合部材の幅を拡大縮小することにより帯状体の幅を拡大縮小することができるので、既設管の湾曲部の湾曲の曲率の大きさにより対応できる。即ち、湾曲部の湾曲の曲率が小さい場合には、嵌合部材の幅を拡大することにより帯状体の幅を拡大すればよく、湾曲部の湾曲の曲率が大きい場合には、嵌合部材の幅を縮小することにより帯状体の幅を縮小すればよい。
【図面の簡単な説明】
【図１】（ａ）（ｂ）（ｃ）は本発明の既設管の更生工法の一実施態様を工程順に示す説明図。
【図２】既設管の直管部に使用する帯状体の一例を示す断面図。
【図３】既設管の湾曲部に使用する帯状体の一例を示す断面図。
【図４】図３に示す帯状体の接合状態を示す断面図。
【図５】帯状体の接続に使用する接続部材の一例を示す斜視図。
【図６】既設管の湾曲部に使用する帯状体の他の一例を示す断面図。
【図７】既設管の湾曲部に使用する帯状体の更に異なる他の一例を示す断面図。
【図８】帯状体の接続に使用する接続部材の他の一例を示す斜視図。
【図９】既設管の直管部に使用する帯状体の他の一例を示す断面図。
【図１０】図９に示す帯状体に使用する主帯状部材の一例を示す断面図。
【図１１】図９に示す帯状体に使用する嵌合部材の一例を示す断面図。
【図１２】既設管の直管部に使用する帯状体の更に異なる他の一例を示す断面図。
【図１３】図１２に示す帯状体に使用する嵌合部材の他の一例を示す断面図。
【図１４】既設管の湾曲部に使用する帯状体の更に異なる他の一例を示す断面図。
【図１５】図１２に示す帯状体に使用する主帯状部材を拡大して示す断面図。
【図１６】既設管の湾曲部に使用する帯状体の更に異なる他の一例を示す断面図。
【図１７】図１６に示す帯状体に使用する嵌合部材をを拡大して示す断面図。
【図１８】（ａ）〜（ｈ）は本発明の既設管の更生工法の他の一実施態様を工程順に示す説明図。
【図１９】従来の更生工法の実施態様を示す断面図。
【符号の説明】
Ｐ既設管
Ｐ１、Ｐ３直管部
Ｐ２湾曲部
Ｒ１、Ｒ２、Ｒ３螺旋管
Ｒ１′、Ｒ２′、Ｒ３′拡径した螺旋管
１、１ａ、１ｂ帯状体
１１基板
１２、１３接合部
１３補強リブ
２、２ａ、２ｂ帯状体
２１基板
２２、２３接合部
２３補強リブ
２５、２１４伸縮部
２３１補強材
３接続部材
３１境界部材
３２挿入部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for correcting an aged existing pipe such as a water and sewage pipe and a gas pipe, and more particularly to a method for correcting an existing pipe having a straight pipe portion and a curved portion.
[0002]
[Prior art]
Metal pipes and fume pipes have long been used for existing pipes used as water and sewage systems and gas pipes. Such existing pipes may become obsolete due to long-term use and may leak due to cracks or corrosion. For this reason, recently, synthetic resin pipes have been inserted into existing pipes such as aged buried pipes for lining.
[0003]
For example, as described in Japanese Patent Publication No. 3-48392, an existing pipe is formed by a spiral pipe formed by spirally winding a strip made of a synthetic resin around one of the existing pipe lining methods. A method of lining is known. In this method, a spiral tube is manufactured by winding a strip-like body for an existing pipe lining in a spiral shape, and bringing adjacent side edges of the spirally wound strip-like body into an engaged state. The inner surface of the existing pipe is lined with the spiral pipe by inserting the spiral pipe into the existing pipe.
[0004]
In the existing pipe lining strip, for example, when a spiral pipe is inserted along a curved existing pipe, the inner peripheral surface of the existing pipe comes into contact with the spiral pipe, so that a large resistance acts on the spiral pipe. For this reason, by sequentially feeding the strips to the spiral tube, a propulsive force in the spiral direction acts on the strips constituting the spiral tube, and a force is applied to the spiral tube to expand the diameter. As a result, a large tensile force acts in the width direction of the band-shaped body constituting the helical tube, and the engagement state between the side edges of the band-shaped body is released by the tensile force, and the helical tube may be damaged. There is.
[0005]
In particular, when the sewage pipe into which the spiral tube is inserted is curved, when the spiral tube inserted into the sewage pipe reaches the curved portion, the inner peripheral surface of the sewage pipe and the outer peripheral surface of the distal end portion of the spiral tube come into contact with each other. A large resistance is applied to the spiral tube. And when a spiral pipe curves along a sewer pipe, tensile force acts on the strip | belt-shaped body which comprises the spiral pipe in the width direction.
[0006]
In order to solve the above problem, as described in Japanese Patent Application Laid-Open No. 8-75042, means for connecting the strips with a joiner and giving the joiner an expansion / contraction function has been proposed.
[0007]
That is, as shown in FIG. 19, a joiner (b) made of a soft vinyl chloride resin is provided between the strips (a) and (b), and the ridge (c) of the joiner (b) is formed into a strip plate (a). By inserting into the concave groove (d) of the plate, the strips (a) and (a) are joined together to form a spiral tube, and the existing tube (f) is formed by deformation of the bending deformation part (e) of the joiner (b) It can be adapted to the curvature of the.
[0008]
[Problems to be solved by the invention]
However, the above-described spiral tube is effective when the curvature of the existing pipe is not so large, but when the curvature of the existing pipe is large, the width of the strip plate needs to be reduced. As a result of using a small strip shape, there was a drawback that the reduction in construction efficiency was inevitable.
[0009]
The present invention has been made paying attention to the problems in the above-described conventional existing pipe rehabilitation method, and the object of the present invention is to solve the problems in the existing existing pipe rehabilitation method, straight pipe part and curved part Even if the curvature of the curved portion of the existing pipe having a large thickness increases, it is not necessary to reduce the width of the strip plate, and there is no fear of lowering the construction efficiency. The purpose is to provide.
[0010]
[Means for Solving the Problems]
The method of rehabilitating an existing pipe having a straight pipe portion and a curved portion according to the first aspect of the present invention is a step of inserting a strip-shaped body for existing pipe lining in which joint portions are formed at both ends in the width direction into the existing pipe. And a method of rehabilitating an existing pipe, including a step of spirally winding the strip in an existing pipe and fitting the joints of adjacent strips together into a spiral pipe, In the vicinity of the boundary between the straight pipe portion and the bending portion, the step of inserting the belt-like body into the straight pipe portion of the existing pipe having the bending portion and winding the band-like body spirally in the straight pipe portion to form a helical tube, A step of cutting the strip of the helical tube in the straight pipe section, and inserting a band section for the bending section having an expansion / contraction section formed so as to be able to extend in the width direction into the bending section of the existing pipe. A step of spirally winding the strip to form a spiral tube, and a strip of the spiral tube in the straight tube section Is characterized in that a step of connecting an end portion of the strip for the curved portion of the helical tube cut end and the curved portion.
[0011]
Further, according to the second aspect of the present invention, there is provided a method for rehabilitating an existing pipe having a straight pipe portion and a curved portion, and inserting a strip-shaped body for existing pipe lining in which joint portions are formed at both ends in the width direction into the existing pipe. A method for rehabilitating an existing pipe, comprising a step of spirally winding a strip in an existing pipe and fitting a joint of adjacent strips together to form a spiral pipe. Insert a band-shaped body for a bending section having an expansion / contraction section formed so as to be able to extend in the width direction into a bending section of an existing pipe having a pipe section and a bending section, and spirally wind the band-shaped body for the bending section In the vicinity of the boundary portion between the bending portion and the straight portion, the step of forming a helical tube, the step of cutting the strip of the helical tube in the bending portion,
A step of connecting the cutting end of the strip of the spiral tube in the bending portion and the end of the strip for the bending portion of the straight spiral tube; and inserting the strip into the straight tube portion of the existing tube; And a step of spirally winding the straight pipe portion into a spiral pipe.
[0012]
Further, according to the third aspect of the present invention, there is provided a method for rehabilitating an existing pipe having a straight pipe portion and a curved portion according to the present invention. The method includes wrapping a step of expanding the diameter of the spiral tube formed in the tube portion and a step of expanding the diameter of the spiral tube formed in the curved portion.
[0013]
According to a fourth aspect of the present invention, there is provided a method of rehabilitating an existing pipe having a straight pipe portion and a bending portion according to the present invention. In the rehabilitation method, the strip for the existing pipe lining is fitted with the main strip member in which joints are formed at both ends in the width direction, and the joint portion of the adjacent main strip member when spirally wound. It is characterized by comprising a fitting member.
[0015]
In the present invention, the belt-like body is integrally formed by extrusion molding or the like with a material such as vinyl chloride resin, polyethylene, polypropylene, polycarbonate, polyester, or so-called FRTP in which these resins are reinforced with glass fibers.
[0016]
In the present invention, the band-shaped body for the bending portion having the expansion / contraction portion has a width direction such as one having a curved shape portion such as “waveform” or “mountain shape” in the width direction, or one provided with a slide mechanism. The thing provided with the expansion-contraction part formed so that it can expand-contract can be used. The size of the expansion / contraction part is not particularly limited, and may be appropriately selected depending on the inner diameter of the existing pipe to be lined, the bending angle, the material strength of the strip, etc. For example, when the existing pipe has an inner diameter of 500 mm and a bending angle of 10 degrees. As shown in FIG. 6, a height (h) of 12 mm, a wall thickness (t) of 2 mm (similar to the substrate), and a radius (R) of about 4 mm are appropriate. The number of stretchable portions provided on the belt-like body for the bending portion may be one or plural.
[0017]
In the present invention, in the vicinity of the boundary portion between the straight pipe portion and the bending portion of the existing pipe, the connection portion between the cut end of the strip of the helical tube in the straight pipe portion and the end portion of the strip of the helical tube in the bending portion Is a portion where the tensile force is not applied to the cutting end of the strip of the helical tube in the straight pipe portion and the end of the strip of the helical tube in the bending portion, that is, in the vicinity of the boundary portion between the straight pipe portion and the bending portion. A little before the curved portion is preferable. For example, in the case of a spiral tube having a diameter of 1000 mm, it is preferably about 50 cm to 1 m before the curved portion.
[0018]
The means for connecting the cut end of the strip of the spiral tube in the straight tube portion and the end of the strip of the spiral tube in the curved portion is not particularly limited. For example, butt fusion may be used, or It is possible to connect the other receiving portion to the receiving portion, and to use the connecting member provided with the short rod-like insertion members on both sides of the boundary member. You may make it insert between the reinforcement ribs of a strip | belt-shaped body.
[0019]
When an opening is generated due to a difference in cross-sectional shape between the strip of the spiral tube in the straight pipe and the strip in the curved portion, the opening may be filled and closed with an epoxy adhesive or the like.
[0020]
When the straight pipe part exists again from the location where the bending part of the existing pipe ends, the strip of the helical tube in the curved part is cut near the boundary between the curved part and the straight pipe part, and straightened at the cut end. What is necessary is just to connect the strip | belt-shaped body of the spiral tube in a pipe part, and lining a straight pipe part by the spiral tube by a strip | belt-shaped body similarly.
[0021]
As a material of the connecting member according to claim 5, synthetic resins such as hard vinyl chloride resin, polyethylene, polypropylene, polycarbonate, and metals such as stainless steel, aluminum, copper and the like can be used.
[0022]
(Function)
In the rehabilitation method for an existing pipe having a straight pipe portion and a bending portion according to the first aspect of the present invention, a belt-like body is inserted into the straight pipe portion of the existing pipe having the straight pipe portion and the bending portion, and the belt-like body is connected to the straight pipe. A step of spirally winding in the section to form a spiral tube, a step of cutting the strip of the spiral tube in the straight pipe portion near the boundary between the straight pipe portion and the curved portion, and a width direction of the curved portion of the existing pipe A step of inserting a band-shaped body for a bending portion having an expansion / contraction portion formed so as to be able to extend to a spiral tube by winding the band-shaped body for the bending portion in a spiral shape, and a band shape of a helical tube in a straight tube portion The cutting end of the body and the step of connecting the end of the band-like body for the bending portion of the spiral tube of the bending portion. Therefore, in the bending portion, even if a tensile force acts on the band-like body, Each expansion / contraction part of the main band-shaped member is expanded in the width direction, and the main band-shaped member for the bending section extends in the width direction. Tensile force is absorbed which acts on the strip with. As a result, even when the curvature of the bending portion of the existing pipe is large, it is possible to cope with the deformation of each expansion / contraction portion.
[0023]
In the rehabilitation method for an existing pipe having a straight pipe portion and a bending portion according to the present invention, the expansion and contraction formed to extend in the width direction on the bending portion of the existing pipe having the straight pipe portion and the bending portion. A step of inserting a band-shaped body for a bending portion having a section, spirally winding the band-shaped body for the bending portion into a spiral tube, a step of cutting the band-shaped body of the spiral tube in the bending portion, and a bending portion and a straight line A step of connecting the cutting end of the strip of the spiral tube in the curved portion and the end of the strip for the curved portion of the straight spiral tube in the vicinity of the boundary with the portion, and a strip in the straight tube portion of the existing tube And the step of inserting the body and spirally winding the belt-like body in the straight tube portion to form a spiral tube. Therefore, in the bending portion, even if a tensile force acts on the belt-like body, the main belt-like member for the bending portion Each of the expansion / contraction parts is expanded in the width direction, and the main band-shaped member for the bending section extends in the width direction. Tensile force is absorbed which acts on the strip with. As a result, even when the curvature of the bending portion of the existing pipe is large, it is possible to cope with the deformation of each expansion / contraction portion.
[0024]
According to a third aspect of the present invention, there is provided a method for rehabilitating an existing pipe having a straight pipe portion and a bending portion, the step of expanding the diameter of the helical tube formed in the straight pipe portion, and the expansion of the helical tube formed in the bending portion. Therefore, it is possible to perform lining with less cross-sectional reduction not only in the straight pipe portion of the existing pipe but also in the curved portion.
[0025]
Further, in the rehabilitation method for an existing pipe having a straight pipe portion and a curved portion according to the present invention as set forth in claim 4, a main belt-like member in which strips for the existing pipe lining are formed with joint portions at both ends in the width direction. And the fitting member that fits with the joint portion of the adjacent main belt-like member when spirally wound, the width of the belt-like body is enlarged by enlarging the width of the fitting member. can do.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1A, 1B and 1C are explanatory views showing an embodiment of the rehabilitation method of the present invention in the order of steps.
[0028]
In FIG. 1A, P is an existing pipe rehabilitated by the rehabilitation method of the present invention, P1 is a straight pipe portion of the existing pipe P, P2 is a curved portion, and P3 is a straight pipe portion.
R1 is a spiral tube provided in the straight pipe portion P1, and the spiral tube R1 is formed by spirally winding the existing pipe lining strip 1 shown in FIG. 2 so that the joint portions of the adjacent strips 1 are joined together. Is formed.
The strip-shaped body 1 for existing pipe lining shown in FIG. 2 is made by extrusion molding using a vinyl chloride resin, and is separated from both ends of the strip-shaped substrate 11 by an appropriate distance. Convex ridges 12 that are joint portions and concave ridges 13 that are the other joint portions are provided. Convex ridges 12 are each composed of a column portion 121 and an insertion portion 122 having a semicircular cross section at the tip. It consists of the insertion part 131 and the flange part 132 which were formed in this. Two T-shaped reinforcing ribs 14 are erected at the center of the substrate 11.
[0029]
A step portion 15 is provided near the inserted portion 131, and a distance L2 from the start portion of the step portion 15 to the center of the inserted portion 131 is substantially equal to a distance L1 from one end of the substrate 11 to the center of the ridge 12, When the strip 1 is wound and the convex strip 12 of one strip 1 of two adjacent strips 1 and 1 is inserted into the concave strip 13 of the other strip 1, the convex strip 12 is provided. The vicinity of one end is fitted to the step portion 15.
[0030]
In the method of the present invention, as shown in FIG. 1 (a), the existing pipe lining strip 1 shown in FIG. 2 is spirally wound, and the concave strip of one strip 1 of adjacent strips 1 and 1 is wound. A lining pipe R1 is formed by inserting and fitting the protruding strips 12 of the other band-like body 1 into the 13 inserted portions 131.
[0031]
In the rehabilitation method of the present invention, as shown in FIG. 1 (a), after the spiral pipe R1 is provided in the straight pipe portion P1 of the existing pipe P, as shown in FIG. In the vicinity of the boundary between the tube portion P1 and the bending portion P2, the end of the strip 1 of the spiral tube R1 is cut, the strip 2 for the bending portion is inserted into the bending portion P2, and the strip 1 of the spiral tube R1. The end of the band-shaped body 2 for the curved portion of the spiral tube R2 is joined to the cut end.
[0032]
That is, the spiral tube R2 is configured by winding the band-shaped body 2 for the bending portion shown in FIG. 3 in a spiral shape and bonding the joint portions of the adjacent band-shaped bodies 2 and 2 together.
[0033]
The belt-like body 2 for the curved portion shown in FIG. 3 is made by extrusion molding using a vinyl chloride resin, and one of the strip-like bodies 2 is separated from both side ends of the substrate 21 of the belt plate-like 2 by an appropriate distance. Convex ridges 22 that are joint portions and concave ridges 23 that are the other joint portions are provided. Convex ridges 22 are composed of column portions 221 and insertion portions 222 having a semicircular cross section at the tip, and the concave ridges 23 are semicircular in cross section. It consists of the to-be-inserted part 231 and the flange part 232 formed in this. Two T-shaped reinforcing ribs 24 are erected at the center of the substrate 11 and an expansion / contraction part 25 bent in a mountain shape is provided.
[0034]
A step portion 26 is provided near the stretchable portion 25 from the inserted portion 231, and a distance L4 from the stretchable portion 25 to the center of the inserted portion 231 is substantially equal to a distance L3 from one end of the substrate 21 to the center of the ridge 22. When the belt-shaped body 2 is wound and the convex strip 22 of one strip-shaped body 2 of two adjacent strip-shaped bodies 2 and 2 is inserted into the concave strip 23 of the other strip-shaped body 2 as shown in FIG. The vicinity of one end where the ridge 22 is provided is fitted to the stepped portion 26.
[0035]
The spiral tube R2 spirally winds the strip-shaped body 2 for the bending portion shown in FIG. 3, and the convex strip 22 of one strip-shaped body 2 of the adjacent strip-shaped bodies 2, 2 becomes the concave strip 23 of the other strip-shaped body 2. The adjacent strips 2 and 2 are joined together by insertion.
[0036]
The connecting member 3 shown in FIG. 5 is used for joining the end of the band 2 for the curved portion of the spiral tube R2 to the cut end of the strip 1 of the spiral tube R1. The connecting member 3 shown in FIG. 5 is configured by projecting short rod-shaped insertion members 32 on both sides of a boundary member 31 made of hard polyvinyl chloride resin. The boundary member 31 has a shape similar to the cross-sectional shape of the belt-like body 2 and has a shape excluding the T-shaped reinforcing rib 24 at the center of the belt-like body 2.
[0037]
The end of the strip 1 of the spiral tube R1 and the end of the strip 2 for the curved portion of the spiral tube R2 are connected to one end of the insertion members 32, 32 of the connecting member 3 and the ridges 13 and the reinforcing ribs 14 of the strip 1. And the other end of each of the insertion members 32, 32 between the wall of the elastic part 25 of the band-like body 2 for the curved part of the spiral tube R2 and the reinforcing rib 24. The connection is made by inserting between the two reinforcing ribs 24, 24.
[0038]
A boundary member 31 of the connecting member 3 is sandwiched between the end of the strip 1 of the spiral tube R1 and the end of the strip 2 for the curved portion of the spiral tube R2. Since the boundary member 31 has a shape similar to the cross-sectional shape of the belt-like body 2, it is hardly noticeable.
[0039]
In this invention rehabilitation method, as shown in FIG.1 (b), after providing spiral pipe R2 in the bending part P2 of the existing pipe P, as shown in FIG.1 (c), the bending part of the existing pipe P In the vicinity of the boundary portion between P2 and the straight pipe portion P3, the excessive end portion of the strip-shaped body 2 for the bending portion of the spiral tube R2 is cut, and the end portion of the strip-shaped body 1 of the spiral tube R3 is connected to the cut end.
[0040]
Similar to the spiral tube R1, the spiral tube R3 is formed by winding the existing tube lining strip 1 shown in FIG. 2 in a spiral manner, and the adjacent strip 1 and the strip 12 of one strip 1 of the strip 1 are connected to the other strip. 1 is inserted into the concave strip 13 and joined.
[0041]
The connection member 3 shown in FIG. 5 is used for connection between the end of the band 2 for the curved portion of the spiral tube R2 and the end of the strip 1 of the spiral tube R3.
[0042]
In the rehabilitation method of the present invention shown in the figure, as described above, the strip 1 of the helical tube R1 of the lining pipe R1 is cut in the vicinity of the boundary between the straight pipe part P1 and the curved part P2 of the existing pipe P. The band-shaped body 2 for the bending portion having the expansion / contraction portion 25 is connected to the cut end. In the bending portion P2, the band-shaped body 2 for the bending portion is spirally wound, and one of the adjacent band-shaped bodies 2, 2 is wound. Since the spiral strip R2 is formed by inserting and fitting the convex strip 23 of the other strip-shaped body 2 into the concave strip 23 of the strip-shaped body 2, a tensile force acts on the strip-shaped body 2 at the curved portion P2. Even so, each stretchable portion 25 of the belt-like body 2 is expanded in the width direction, and the belt-like body 2 extends in the width direction and the tensile force acting on the belt-like body 1 is absorbed. As a result, even when the curvature of the bending portion P2 of the existing pipe P is large, it can be dealt with by the deformation of each expansion / contraction portion 25.
In the method of the present invention, the method of winding the strips 1 and 2 may be the method described in JP-A-6-143420.
[0043]
FIG. 6 is a cross-sectional view showing another example of the belt-like body for the bending portion. The belt-like body 2a shown in FIG. 6 is provided with reinforcing ribs 24a and 24a having an inverted L-shaped cross section in addition to the T-shaped reinforcing rib 24. A steel reinforcing member 241 having a W-shaped cross section is inserted between the reinforcing ribs 24a and 24a.
[0044]
FIG. 7 is a cross-sectional view showing another example of the band for the bending portion. In the band 2b shown in FIG. 7, a slidable expansion / contraction section is provided instead of the bent expansion / contraction section. . That is, the belt-like body 2 b is composed of two members 211 and 212, one member 211 is provided with an arrow-shaped insertion portion 213, and the other member 212 is provided with a bifurcated fitting portion 214. In addition, a stopper 215 is provided on the inner side of the opening of the fitting portion 214. The expansion / contraction part is configured by inserting an insertion part 213 into the bifurcated fitting part 214 so as to be slidable.
[0045]
FIG. 8 is a perspective view showing another example of the connection member. In the connection member 4 a shown in FIG. 8, tapered portions 421 are provided at both ends of the insertion member 42 so as to facilitate insertion. The insertion member 42 may be fitted with a rubber band for preventing it from coming off.
[0046]
FIG. 9 is a cross-sectional view showing another example of a strip-like body used for the straight pipe portions P1 and P3 of the existing pipe P and the spiral pipes R1 and R3. The belt-like body 1a shown in FIG. 9 includes a main belt-like member 11a and a fitting member 12a.
As shown in an enlarged view in FIG. 10, the main belt-like member 11 a is provided with a concave strip 112 that is a joint portion at an appropriate distance from both ends of the strip-like substrate 111, and the concave strip 112 has a semicircular cross section. It consists of the to-be-inserted part 1121 and the flange part 1122 formed in this. Two inverted L-shaped reinforcing ribs 113, 113 are erected at the center of the substrate 11, and a steel reinforcing material 1131 having a W-shaped cross section is inserted between the reinforcing ribs 113, 113. A step 116 is provided in the vicinity of the inserted portion 1121.
[0047]
As shown in the enlarged view of FIG. 11, the fitting member 12 a is provided with two ridges 122 and 122 erected at an appropriate distance from both ends of the substrate 121. The ridge 122 includes a support column 1221 and an insertion unit 1222 having a semicircular cross section disposed at the tip of the support column 1221. A reinforcing rib 123 is erected at the center of the substrate 121. A sealing material 124 is attached to the upper surface of the substrate 121.
[0048]
In order to form a spiral tube with the strip-shaped body 1a shown in FIG. 9, the main strip-shaped member 11a is formed by bending and inserting the convex strip 122 of the fitting member 12a into the concave strip 112 of the main strip-shaped member 11a.
[0049]
FIG. 12 is a cross-sectional view showing still another example of the band-like body used for the spiral pipes R1 and R3 of the straight pipe portions P1 and P3 of the existing pipe P. 12 includes a main belt-like member 11a shown in FIG. 10 and a fitting member 12b shown in FIG.
As shown in FIG. 13, the fitting member 12 b is the same as the fitting member 12 a shown in FIG. 11 except that two reinforcing ribs 123 and 123 are erected at the center of the wide substrate 121. Description of other parts is omitted.
[0050]
FIG. 14 is a cross-sectional view showing another example of a belt-like body used for the spiral tube R2 of the curved portion P2 of the existing tube P.
A belt-like body 2a shown in FIG. 14 includes a main belt-like member 21a shown in FIG. 15 and a fitting member 12a shown in FIG.
[0051]
The main belt-like member 21a shown in FIG. 15 is provided with a stretchable portion 213 formed by bending the substrate 211 between the concave strip 212 near the both ends of the belt-like substrate 211 and the inverted L-shaped reinforcing rib 213. Except for this, it is the same as the main belt-like member 11a shown in FIG.
[0052]
FIG. 16 is a cross-sectional view showing still another example of a strip-like body used for the spiral tube R2 of the curved portion P2 of the existing tube P.
A belt-like body 2b shown in FIG. 16 includes a main belt-like member 21a shown in FIG. 15 and a fitting member 12c shown in FIG.
[0053]
The fitting member 12c shown in FIG. 17 is the same as the fitting member 12a shown in FIG. 11 except that a head portion 1231 having a triangular cross section is provided at the tip of the reinforcing rib 123 erected at the center of the substrate 121. Since there is, explanation of other parts is omitted.
[0054]
18A to 18H are explanatory views showing another embodiment of the rehabilitation method of the present invention in the order of steps.
18 (a) to (h), P is an existing pipe rehabilitated by the method of the present invention, P1 is a straight pipe portion of the existing pipe P, P2 is a curved portion, and P3 is a straight pipe portion.
[0055]
First, as shown in FIG. 18 (a), in the straight pipe portion P1 of the existing pipe P, the existing lining strip 1 shown in FIG. A spiral tube having an outer diameter slightly smaller than the inner diameter of the straight pipe portion P1 of the existing pipe P by rotating the machine 5 so as to straddle between the joint portions of the adjacent strips 1 and joining the joint portions to each other. Form.
[0056]
Next, as shown in FIG. 18 (b), the self-propelled pipe making machine 5 is temporarily stopped and the self-propelled pipe making machine 5 is forcibly supplied with only the strip 1 to be self-propelled. The spiral pipe R1 ′ having an enlarged diameter is formed so as to increase the diameter until it has the same outer diameter as the inner diameter of the straight pipe portion P1 of the existing pipe P, leaving a portion very close to the pipe making machine 5. It is made to closely contact in the straight pipe part P1 of the existing pipe P.
[0057]
Next, as shown in FIG. 18 (c), the end of the strip 1 is cut at a point approximately 50 cm to 1 m before the boundary of the bending portion P2 of the existing pipe P, and the bending portion shown in FIG. The self-propelled pipe making machine 5 is connected to the adjacent belt-like body 2 while being spirally wound while supplying the belt-like body 2 within the curved portion P2 of the installation pipe P. A spiral tube having an outer diameter slightly smaller than the inner diameter of the curved portion P2 of the existing pipe P is formed by causing the joint portions to be joined one to two times so as to straddle between the joint portions.
[0058]
Next, as shown in FIG. 18 (d), the self-propelled pipe making machine 5 is stopped once and the self-propelled pipe making machine 5 is forcibly supplied with only the belt-like body 2. The spiral pipe R2 having a diameter expanded by one or two turns so as to be expanded until it has the same outer diameter as the inner diameter of the straight pipe portion P2 of the existing pipe P, leaving a portion very close to the pipe making machine 5 'Is formed and brought into close contact with the curved portion P2 of the existing pipe P.
[0059]
The spiral tube R2 ′ having an enlarged diameter for one or two rounds is formed by sufficiently expanding the curved portion while securing a short diameter portion because the eccentric force acts on the tube when the curved portion is enlarged. This is because the diameter can be increased.
Similarly, as shown in FIGS. 18 (e) and 18 (f), a spiral pipe R 2 ′ whose diameter is gradually increased is formed and brought into close contact with the curved portion P 2 of the existing pipe P.
[0060]
Next, as shown in 18 (g), the end of the belt-like body 2 is cut at a point about 1 m behind the boundary portion of the curved portion P2 of the existing pipe P, and the straight pipe portion shown in FIG. The belt-like body 1 is supplied and connected, and the self-propelled pipe making machine 5 is connected to the adjacent belt-like body 1 while being spirally wound while supplying the belt-like body 1 within the straight pipe portion P3 of the installation pipe P. A spiral tube having an outer diameter slightly smaller than the inner diameter of the straight pipe portion P3 of the existing pipe P is formed by wrapping around the joint portions and joining the joint portions.
[0061]
Furthermore, as shown in FIG. 18 (h), by temporarily stopping the circulation of the self-propelled pipe making machine 5 and forcibly supplying only the strip 1 to the self-propelled pipe making machine 5, A spiral pipe R3 ′ having an enlarged diameter is formed so as to be expanded until it has the same outer diameter as the inner diameter of the straight pipe portion P3 of the existing pipe P, leaving a portion very close to the pipe machine 5. The tube P is brought into close contact with the curved portion P3.
[0062]
In the above example, the formation of the smaller helical tube and the diameter expansion are sequentially performed, but they may be performed simultaneously. When performing simultaneously, it is good to make the supply speed | rate of a strip | belt-like body a little faster than the peripheral line speed of the self-propelled pipe manufacturing machine 5. FIG.
As described above, in the case of this embodiment, it is possible to perform the lining with a small cross-sectional reduction by the spiral tube whose diameter is expanded not only in the straight tube portion of the existing tube but also in the curved portion.
[0063]
The embodiment of the present invention has been described above with reference to the drawings. However, the specific configuration of the present invention is not limited to the illustrated embodiment, and design changes within a scope that does not depart from the spirit of the present invention can be made. include.
[0064]
【The invention's effect】
In the rehabilitation method for an existing pipe having a straight pipe portion and a bending portion according to the first aspect of the present invention, even if a tensile force acts on the band-like body in the bending portion, each expansion / contraction portion of the main band-like member for bending portion is It becomes a state which spreads in the width direction, and the tensile force acting on the band-shaped body is absorbed by the main band-shaped member for bending portion extending in the width direction. As a result, even when the curvature of the bending portion of the existing pipe is large, it is possible to cope with the deformation of each expansion / contraction portion. Therefore, even if the curvature of the bending portion of the existing pipe is increased, it is not necessary to reduce the width of the band plate shape, and there is no fear that the construction efficiency is lowered.
[0065]
Further, in the rehabilitation method for an existing pipe having a straight pipe portion and a bending portion according to the second aspect of the present invention, each expansion and contraction of the main belt-like member for the bending portion even if a tensile force acts on the band-like body in the bending portion. The portion is expanded in the width direction, and the main belt-like member for the bending portion extends in the width direction and the tensile force acting on the belt-like body is absorbed. As a result, even when the curvature of the bending portion of the existing pipe is large, it is possible to cope with the deformation of each expansion / contraction portion. Therefore, even if the curvature of the bending portion of the existing pipe is increased, it is not necessary to reduce the width of the band plate shape, and there is no fear that the construction efficiency is lowered.
[0066]
In the rehabilitation method for an existing pipe having a straight pipe portion and a curved portion according to the third aspect of the present invention, a lining with a small cross-sectional reduction is provided by a spiral pipe whose diameter is expanded not only in the straight pipe portion of the existing pipe but also in the curved portion. It can be carried out.
[0067]
Further, in the rehabilitation method of the existing pipe having the straight pipe portion and the curved portion of the present invention according to claim 4, since the width of the belt-like body can be enlarged or reduced by enlarging or reducing the width of the fitting member, This can be dealt with by the curvature of the bending portion of the existing pipe. That is, when the curvature of the bending portion is small, the width of the band-shaped body may be increased by increasing the width of the fitting member. When the bending curvature of the bending portion is large, What is necessary is just to reduce the width | variety of a strip | belt-shaped body by reducing a width | variety.
[Brief description of the drawings]
FIGS. 1A, 1B, and 1C are explanatory views showing an embodiment of the existing pipe rehabilitation method according to the present invention in the order of steps;
FIG. 2 is a cross-sectional view showing an example of a strip used for a straight pipe portion of an existing pipe.
FIG. 3 is a cross-sectional view showing an example of a strip used for a curved portion of an existing pipe.
4 is a cross-sectional view showing a bonding state of the belt-like body shown in FIG. 3;
FIG. 5 is a perspective view showing an example of a connection member used for connecting strips.
FIG. 6 is a cross-sectional view showing another example of a belt-like body used for a curved portion of an existing pipe.
FIG. 7 is a cross-sectional view showing still another example of a belt-like body used for a curved portion of an existing pipe.
FIG. 8 is a perspective view showing another example of a connecting member used for connecting strips.
FIG. 9 is a cross-sectional view showing another example of a strip used for a straight pipe portion of an existing pipe.
10 is a cross-sectional view showing an example of a main belt-like member used for the belt-like body shown in FIG.
11 is a cross-sectional view showing an example of a fitting member used for the belt-like body shown in FIG.
FIG. 12 is a cross-sectional view showing still another example of a belt-like body used for a straight pipe portion of an existing pipe.
13 is a cross-sectional view showing another example of a fitting member used for the belt-like body shown in FIG.
FIG. 14 is a cross-sectional view showing still another example of a band-like body used for a curved portion of an existing pipe.
15 is an enlarged cross-sectional view of a main band member used for the band shown in FIG.
FIG. 16 is a cross-sectional view showing still another example of a band-like body used for a curved portion of an existing pipe.
17 is an enlarged cross-sectional view of a fitting member used for the belt-like body shown in FIG.
18A to 18H are explanatory views showing another embodiment of the existing pipe rehabilitation method of the present invention in the order of steps.
FIG. 19 is a cross-sectional view showing an embodiment of a conventional rehabilitation method.
[Explanation of symbols]
P Existing pipe
P1, P3 straight pipe
P2 curved part
R1, R2, R3 spiral tube
R1 ', R2', R3 'expanded diameter spiral tube
1, 1a, 1b strip
11 Substrate
12, 13 Joint
13 Reinforcement rib
2, 2a, 2b strip
21 Substrate
22, 23 joints
23 Reinforcing ribs
25, 214 Elastic part
231 reinforcement
3 connecting members
31 Boundary member
32 Insertion member

Claims

A step of inserting a strip-shaped body for an existing pipe lining in which joint portions are formed at both ends in the width direction into the existing pipe, and winding the strip in a spiral shape in the existing pipe, and joining the joint portions of adjacent strip-shaped bodies A method for rehabilitating an existing pipe including a step of forming a spiral pipe by fitting each other, and inserting a strip into the straight pipe of the existing pipe having a straight pipe portion and a curved portion, A step of spirally winding in the section to form a spiral tube, a step of cutting the strip of the spiral tube in the straight pipe portion near the boundary between the straight pipe portion and the curved portion, and a width direction of the curved portion of the existing pipe A step of inserting a band-shaped body for a bending portion having an expansion / contraction portion formed so as to be able to extend to a spiral tube by winding the band-shaped body for the bending portion in a spiral shape, and a band shape of a helical tube in a straight tube portion Connecting the cut end of the body and the end of the band for the bending portion of the helical tube of the bending portion Rehabilitation method of the existing pipe having a curved portion and the straight tube portion, which comprises a.

A step of inserting a strip-shaped body for an existing pipe lining in which joint portions are formed at both ends in the width direction into the existing pipe, and winding the strip in a spiral shape in the existing pipe, and joining the joint portions of adjacent strip-shaped bodies A method of rehabilitating an existing pipe including a step of forming a helical pipe by fitting each other, and extending and contracting to be able to extend in a width direction on a curved portion of an existing pipe having a straight pipe portion and a curved portion A step of inserting a band-shaped body for a bending portion having a section, spirally winding the band-shaped body for the bending portion into a spiral tube, a step of cutting the band-shaped body of the spiral tube in the bending portion, and a bending portion and a straight line A step of connecting the cutting end of the strip of the spiral tube in the curved portion and the end of the strip for the curved portion of the straight spiral tube in the vicinity of the boundary with the portion, and a strip in the straight tube portion of the existing tube Inserting the body and winding the belt-like body spirally in the straight tube section to form a spiral tube Rehabilitation method of the existing pipe having a curved portion and the straight tube portion, which comprises a.

The straight pipe portion and the bending according to claim 1 or 2, comprising a step of expanding the diameter of the helical tube formed in the straight pipe portion and a step of expanding the diameter of the helical tube formed in the bending portion. Rehabilitation method for existing pipes with parts.

A main band member in which a band-shaped body for an existing pipe lining is formed with joints at both ends in the width direction, and a fitting member that fits into a joint of adjacent main band-shaped members when spirally wound The rehabilitation method for an existing pipe having a straight pipe portion and a bending portion according to any one of claims 1 to 3.