JP2004069053A

JP2004069053A - Pipe opening water-proof structure and pipe opening water-proofing method of regeneration pipe

Info

Publication number: JP2004069053A
Application number: JP2003164150A
Authority: JP
Inventors: Tsukasa Uemichi; 上道　司; Yukihiro Takano; 高野　幸弘
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 2002-06-11
Filing date: 2003-06-09
Publication date: 2004-03-04

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe opening water-proof structure and a pipe opening water-proofing method of a regeneration pipe capable of securing water proof near the pipe opening of the regeneration pipe easily and for a long period of time while shortening construction time duration. <P>SOLUTION: In a pipe opening water-proof structure of the regeneration pipe, water in the pipe opening of the regeneration pipe for regenerating inside of an existing pipe is stopped with respect to the existing pipe. Between the pipe opening of the existing pipe and the pipe opening of the regeneration pipe, a water-proof material made of crosslinking rubber for sealing the gap between them with a substantially uniform thickness over the circumferential entire region is disposed. The seal-like water-proof material made of crosslinking rubber is adhered to the inner peripheral surface of the pipe opening of the existing pipe before diameter expansion of the regeneration pipe or the outer peripheral surface of the pipe opening of the regeneration pipe with the substantially uniform thickness over the circumferential entire region. Then, by expanding the diameter of the regeneration pipe, the pipe opening of the existing pipe and the pipe opening of the regeneration pipe are adhered to each other and sealed by the water-proof material rubber. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、既設管内を更生する更生管の管口を既設管に対し止水するようにした更生管の管口止水構造および管口止水方法に関する。
【０００２】
【従来の技術】
一般に、既設管内を更生する更生管としては、ＦＲＰ、塩化ビニル樹脂、ポリエチレン樹脂などの材料が適用されている。そして、このような更生管を用いて崩落やひび割れなどが発生している既設管を更生する場合、新設された更生管により覆われている部分、つまり管路部分では、止水性が十分に確保されているものの、マンホールなどと接する管口付近での止水性が問題視されている。
【０００３】
そのため、更生管を既設管に対しエア圧などを加えて拡径させる前、つまり密着させる前に、既設管の管口付近に水膨張ゴムなどの止水材や、ガラスクロス又はガラスマットにエポキシ樹脂等の室温硬化性樹脂を含浸した止水材を充填しておき、更生管を既設管に対し拡径させることによって、既設管の管口と更生管の管口との間を水膨張ゴムにより密着させてシールすることが行われている（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特開平３−２８２０９０号公報
【０００５】
しかし、水膨張ゴムにより管口を止水するものでは、更生管を既設管に対し拡径させて密着させた後に水膨張ゴムの反応が進み、更生管と既設管との間で反応が進行して管の軸方向に流動的なものとなる。そのため、更生管と既設管との間において水膨張ゴムの圧縮率を十分に稼ぐことができず、更生管の管口での止水性が不十分なものとなり、長期にわたって止水することができないという欠点があった。
【０００６】
又、ガラスクロス又はガラスマットにエポキシ樹脂等の室温硬化性樹脂を含浸した止水材で止水するするものでは、室温硬化性樹脂が硬化すると樹脂が硬くなり振動等で亀裂がはいり、止水性が不十分なものとなり、長期にわたって止水することができないという欠点があった。
【０００７】
また、その他の対策としては、更生管を既設管に対し拡径させて密着させた後に、更生管の管口付近にエポキシ樹脂やモルタルなどを充填させることによって、更生管の管口での止水性を確保し得るようにすることも行われている。
【０００８】
しかし、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるものでは、施工後の工程が増し、施工時間も自ずと増大することになる。
【０００９】
【発明が解決しようとする課題】
本発明は、かかる点に鑑みてなされたものであり、その目的とするところは、更生管の管口付近での確実な止水性を施工時間を短縮しつつ簡単かつ長期にわたって確保することができる更生管の管口止水構造および管口止水方法を提供することにある。
【００１０】
【課題を解決するための手段】
請求項１記載の更生管の止水構造は、既設管内を更生する更生管の管口を既設管に対し止水するようにした更生管の管口止水構造であって、上記既設管の管口と更生管の管口との間には、その両者間を略均一の厚さで周方向全域に亘ってシールする架橋ゴムよりなる止水材が介設されていることを特徴とする。
【００１１】
上記更生管の止水構造により、既設管の管口と更生管の管口との間を略均一の厚さで周方向全域に亘ってシールする架橋ゴムよりなる止水材は、更生管を既設管に対し拡径させて密着させた際に、その両者間の周方向においてほぼ均一の圧縮率が確保され、既設管の管口と更生管の管口との間での止水性が十分に確保されることになる。
【００１２】
しかも、架橋ゴムよりなる止水材は既設管の管口と更生管の管口との間に介設されているので、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することが可能となる。
【００１３】
上記架橋ゴムとしては、従来より建設用材料として一般に使用されている架橋ゴムであればよく、例えば、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、１，２−ポリブタジエンゴム（１，２−ＢＲ）、スチレン−ブタジエンゴム（ＳＢＲ）、スチレン−ブタジエン−スチレンブロック共重合体（ＳＩＳ）、クロロプレンゴム（ＣＲ）、ニトリルゴム（ＮＢＲ）、ブチルゴム（ＩＩＲ）、エチレン−プロピレンゴム（ＥＰＲ、ＥＰＤＭ）、クロロスルホン化ポリエチレン（ＣＳＭ）、アクリルゴム（ＡＣＭ、ＡＮＭ）、エピクロルヒドリンゴム（ＣＯ、ＥＣＯ）、シリコーンゴム（Ｑ）、フッ素ゴム（ＦＫＭ、ＦＺ）、ウレタンゴム（Ｕ）などのゴムの架橋物があげられる。
【００１４】
上記ゴムは、硬くなると老朽化した既設管の管口付近において発生している崩落やひび割れに対してゴムが変形して追従しにくくなり、既設管の管口と更生管の管口との間での止水性が低下するので、硬度が８０以下になる程度に架橋されているのが好ましい。
【００１５】
上記架橋ゴムのうち、硬度６０以下の超低硬度の架橋ブチルゴムは、老朽化した既設管の管口付近において発生している崩落やひび割れに対してゴムが変形して容易に追従し、既設管の管口と更生管の管口との間での止水性が特に優れているので、特に好ましい。
【００１６】
請求項３記載の更生管の管口止水方法は、既設管内を更生する更生管の管口を既設管に対し止水するようにした更生管の管口止水方法であって、上記更生管の拡径前の既設管の管口内周面または更生管の管口外周面にシール状の架橋ゴムよりなる止水材を略均一の厚さで周方向全域に亘って貼り付けておき、その後、上記更生管を拡径させることによって、既設管の管口と更生管の管口との間を上記止水材により密着させてシールすることを特徴とする。
【００１７】
つまり、更生管の拡径前の既設管の管口内周面または更生管の管口外周面にシール状の架橋ゴムよりなる止水材を略均一の厚さで周方向全域に亘って貼り付けておいて、更生管を拡径すれば、既設管の管口と更生管の管口との間に略均一の厚さで周方向全域に亘ってシールする架橋ゴムよりなる止水材が簡単に介設されることになり、既設管の管口と更生管の管口との間での止水性が十分に確保されるのはもちろんのこと、施工時間を短縮しつつ簡単かつ容易に施工することも可能となる。
【００１８】
又、架橋ゴムとして、硬度６０以下の超低硬度の架橋ブチルゴムを使用すると、老朽化した既設管の管口付近において発生している崩落やひび割れに対してゴムが変形して容易に追従し、既設管の管口と更生管の管口との間での止水性が更に向上する。
【００１９】
請求項５記載の更生管の止水構造は、既設管内を更生する更生管の管口を既設管に対し止水するようにした更生管の管口止水構造であって、上記既設管の管口と更生管の管口との間には、その両者間を周方向全域に亘ってシールする、硬度８０以下の架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材が介設されていることを特徴とする。
【００２０】
上記架橋水膨張ゴムとは、乾燥状態ではゴム状の弾性を有しており、水を吸収すると軟化膨潤する性状を有するゴムであり、一般には吸水性樹脂とゴムを混合したものである。
【００２１】
上記吸水性樹脂は、水に接触すると吸収膨潤してゲル状になりうる高分子樹脂であり、水溶性樹脂を一部架橋した高分子樹脂が使用される。この高分子樹脂としては、例えば、でんぷん、セルロ−ス、ポリビニルアルコール、親水性アクリル樹脂、無水マレイン酸系樹脂、親水性ポリウレタン系樹脂等が挙げられる。
【００２２】
又、上記ゴムも架橋物であり、前述のゴム架橋物が使用可能であるが、クロロプレンゴム（ＣＲ）及びスチレン−ブタジエン−スチレンブロック共重合体（ＳＩＳ）の架橋物が好ましい。
【００２３】
上記架橋水膨張ゴムは、硬くなると老朽化した既設管の管口付近において発生している崩落やひび割れに対してゴムが変形して追従しにくくなり、既設管の管口と更生管の管口との間での止水性が低下するので、硬度は８０以下である。
【００２４】
上記止水材は、架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなるが、接着性又は粘着性材料としては、従来より建設用材料として一般に使用されている接着剤又は粘着剤であればよく、例えば、ゴム系、アクリル系、エポキシ系、ウレタン系、シリコン系等の接着剤及び粘着剤が挙げられ、無架橋ブチルゴムが好適に使用される。
【００２５】
上記更生管の止水構造により、既設管の管口と更生管の管口との間を周方向全域に亘ってシールする架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材は、更生管を既設管に対し拡径させて密着させた際に、架橋水膨張ゴムの反発弾性により、既設管の管口と更生管の管口との間での止水性が十分に確保されることになる。
【００２６】
又、施工後に水漏れが発生しそうになると、架橋水膨張ゴム層が水を吸収して膨張することにより止水効果が増強され、既設管の管口と更生管の管口との間での止水性がより十分に確保されることになる。
【００２７】
しかも、架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されているので、止水材は既設管の管口と更生管の管口により密着し、止水効果が優れていると共に、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することが可能となる。
【００２８】
更に、止水材が、略長尺板状体であって、長さ方向に凸条が形成されていると、止水材は既設管の管口と更生管の管口により密着し、止水効果が更に向上する。
【００２９】
又、止水材が、セルフシール構造であると、止水材は既設管の管口と更生管の管口により密着し、止水効果が更に向上する。尚、セルフシール構造とは、管口に水圧が加わった際に構造上、シール力を発揮するものである。
【００３０】
請求項９記載の更生管の管口止水方法は、既設管内を更生する更生管の管口を既設管に対し止水するようにした更生管の管口止水方法であって、上記更生管の拡径前の既設管の管口内周面または更生管の管口外周面に、硬度８０以下の架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材を略均一の厚さで周方向全域に亘って貼り付けておき、その後、上記更生管を拡径させることによって、既設管の管口と更生管の管口との間を上記止水材により密着させてシールすることを特徴とする。
【００３１】
つまり、更生管の拡径前の既設管の管口内周面または更生管の管口外周面に、硬度８０以下の架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材を、周方向全域に亘って貼り付けておいて、更生管を拡径すれば、既設管の管口と更生管の管口との間に周方向全域に亘ってシールする止水材が簡単に介設されることになり、架橋水膨張ゴムの反発弾性により、既設管の管口と更生管の管口との間での止水性が十分に確保されるのはもちろんのこと、施工時間を短縮しつつ簡単かつ容易に施工することも可能となる。
【００３２】
又、施工後に水漏れが発生しそうになると、架橋水膨張ゴム層が水を吸収して膨張することにより止水効果が増強され、既設管の管口と更生管の管口との間での止水性がより十分に確保されることになる。
【００３３】
しかも、架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されているので、止水材は既設管の管口と更生管の管口により密着し、止水効果が優れていると共に、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することが可能となる。
【００３４】
更に、止水材が、略長尺板状体であって、長さ方向に凸条が形成されている又はセルフシール構造であると、止水材は既設管の管口と更生管の管口により密着し、止水効果が更に向上する。
【００３５】
次に、本発明の更生管の管口止水構造及び管口止水方法を図面を参照して説明する。
【００３６】
図１は本発明に係わる管口止水構造において使用される更生管を示し、この更生管１は、塩化ビニル樹脂などの熱可塑性樹脂材料よりなり、外面に長手方向に沿って延びる凹部１１を有するように変形されて断面外形面積が小さくなる襞状に縮退させた形状に成形されている。
【００３７】
又、この更生管１は、所定の形状回復温度（例えば８０℃）に加熱されることによって円筒体に形状回復する性能を有している。この場合、形状回復温度とは、圧力などの外力を作用させることなく、加熱のみで円筒形に形状回復する温度のことである。
【００３８】
この更生管１の製造方法は以下の通りである。図２に示すように、先ず、押出機２１にて熱可塑性樹脂材料の円筒体１０を押出成形し、その円筒体１０を冷却水槽２２中に通過させて冷却し、変形装置２３にて、形状回復温度の雰囲気中で外面を押し潰して、図１に示す如く外面に長手方向に沿って延びる凹部１１を形成する。その後、断面外形面積が減少するように引張装置２４にて円筒体１０を引っ張り、この円筒体１０を、トラバース部２５を経由して、ドラム２６上に巻き取る。
【００３９】
このようにして製造された更生管１は、既設管の更生現場に搬入されるまでの間は、外気温の影響を受けて管自身が「自然形状回復」することがないように、拘束手段を用いて拘束するか、低温保管することが好ましい。
【００４０】
次に、既設管の更生作業について説明する。ここでは、図３に示すように、上流側マンホールＱ１（図３において左側に位置するマンホール）と下流側マンホールＱ２（図３において右側に位置するマンホール）との間に埋設されている既設管３を更生する場合について説明する。
【００４１】
上流側マンホールＱ１付近の地上には、上記ドラム２６上に巻き取られた更生管１が搬入されている。一方、下流側マンホールＱ２付近の地上には、ウィンチ５１が配設されている。又、下流側マンホールＱ２の下部には更生管１を牽引するワイヤ５４を案内するためのガイド部５２が設けられている。尚、更生管１を既設管３に挿入するのに先立って、予め、既設管３の内部を洗浄し且つ突出物を除去しておく。
【００４２】
先ず、止水材設置工程として、シート状に成形した止水材４を更生管１拡径前の既設管３の管口内周面に略均一の厚さで周方向全域に亘って貼り付けておく。この止水材４の表面側（更生管１側）の面は、図示しないペットフィルムにより覆っておく。このとき、止水材４の幅（既設管３の軸方向寸法）は、２０〜５０ｍｍ位に設定されている。
【００４３】
次いで、更生管敷設工程として、図３に示すように、ウインチ５１から導出されるワイヤ５４の先端を、下流側マンホールＱ２の下端から既設管３内を経て上流側マンホールＱ１の下端に導いておく。それから、ドラム２６を回転させ、更生管１の先端を上流側マンホールＱ１の下端つまり既設管３の上流側端まで導出させる。
【００４４】
そして、上流側マンホールＱ１内で、更生管１の先端に先端具５３を取り付けると共に、この先端具５３に、ウインチ５１から延びるワイヤ５４の先端を係止する。その後、ドラム２６から送り出された更生管１の先端を既設管３の内部に挿入した状態で、ウィンチ５１によってワイヤ５４を巻き取ることにより更生管１を牽引し、更生管１を既設管３の内部に引き込んでいく。
【００４５】
この動作により、更生管１を、上流側マンホールＱ１側から下流側マンホールＱ２側まで導いて、上流側マンホールＱ１と下流側マンホールＱ２との間を結ぶ既設管３内の全長に亘って敷設する。
【００４６】
この際の既設管３内における更生管１の配置状態を図４（ａ）に示す。このとき、止水材４の表面側の面がペットフィルムにより覆われているので、ウィンチ５１によるワイヤ５４を介した更生管１の既設管３内部への引き込み操作によって、止水材４が更生管１およびワイヤ５４に引きずられることがなく、更生管１の引き込み操作が円滑に行える。しかる後、止水材４の表面側の面を覆うペットフィルムを剥ぎ取る。
【００４７】
その後、ライニング工程に進む。このライニング工程では、図５に示すように、上流側マンホールＱ１付近の地上に、蒸気発生・加圧器５５を配設し、下流側マンホールＱ２付近の地上に水・蒸気分離器５６を配設する。更生管１の後端にエルボ５７を連結し、そのエルボ５７に蒸気発生・加圧器５５から延びるホース５５ａを連結するともに、更生管１先端の先端具５３に水・蒸気分離器５６から延びるホース５６ａを連結する。また、エルボ５７及び先端具５３には図示しない温度センサーを取り付けておく。
【００４８】
この状態で、蒸気発生・加圧器５５より更生管１内に蒸気を連続的に供給し、その蒸気を水・蒸気分離器５６へ流下させつつ、更生管１をその内部より形状回復温度まで加熱して、略元の円筒体に形状回復させる。この際の既設管３内における更生管１の状態を図４（ｂ）に示す。
【００４９】
このようにして更生管１を円筒体に形状回復させた後、先端具５３を密閉状態にし、その更生管１の内部に蒸気発生・加圧器５５より加熱圧縮空気を送って、図６に示すように、更生管１を、その内部より加熱加圧膨張させて既設管３の内面に密着させ（この際の既設管３内における更生管１の状態を図４（ｃ）に示す）、この加圧状態にて、冷却固定して、既設管３の内面のライニング作業を終了する。
【００５０】
このとき、更生管１拡径前の既設管３の管口内周面に略均一の厚さで周方向全域に亘って貼り付けておいた止水材４は、更生管１の加圧膨張によって、更生管１両端の管口と既設管３両端の管口との間において周方向全域に亘って水密性を確保し得る状態に圧接され、更生管１両端の管口を既設管３両端の管口に対してシールするシール工程が行われる。
【００５１】
【発明の実施の形態】
以下、本発明の実施例について説明するが、下記の例に限定されるものではない。
【００５２】
（実施例１〜３、比較例１〜３）
内径２５０ｍｍのフューム管よりなる既設管の両端部内面に、表１に示したゴム製の、幅５０ｍｍ、　厚さ５ｍｍの長尺板状体の止水材を貼付した後、直径２３５ｍｍの塩化ビニル樹脂管よりなる更生管を図１に示したように変形し、フューム管に挿入した。
【００５３】
次いで、図５に示したように、　蒸気発生・加圧器により蒸気を供給して、塩化ビニル樹脂管を略元の円筒状に形状回復し、更に、蒸気発生・加圧器により加熱圧縮空気を送って、塩化ビニル樹脂管を加熱加圧膨張させ、フューム管の内面に密着させて更生管を得た。
【００５４】
得られた更生管の止水性能を評価し、結果を表１に示した。尚、評価方法は以下の通りである。
【００５５】
図７に示すように、既設管３と更生管１との間にポンプにより０．１０ＭＰａまで水圧を加え、既設管３と更生管１との間の水圧を測るように設置された圧力ゲージ６により漏水圧を測定した。０．１０ＭＰａでも漏水しないものは０．１０ＭＰａと表示した。
【００５６】
【表１】

【００５７】
架橋ブチルゴム（１）；硬度６０、
架橋ブチルゴム（２）；硬度２０、
架橋水膨張ゴム（３）；ウレタン系架橋水膨張ゴム、硬度６０
無架橋水膨張ゴム（５）；硬度６０、
【００５８】
（実施例４、５）
止水材として、架橋水膨張ゴム（３）よりなる、幅３０ｍｍ、　厚さ４．９ｍｍの長尺板状体の架橋水膨張ゴムの両面に、厚さ０．０５ｍｍの表２に示した接着剤層が積層されてなる止水材を用いた以外は実施例１で行ったと同様にして更生管を得た。
【００５９】
（実施例６）
止水材として、図８に示したように、幅３０ｍｍ、　厚さ４．５ｍｍの長尺板状体４１の一面に、高さ４ｍｍの２本の凸条４２の形成された架橋水膨張ゴム（３）層４３の両面に、厚さ０．０５ｍｍの無架橋ブチルゴム（４）層が積層されてなるリブ形状の止水材を用いた以外は実施例１で行ったと同様にして更生管を得た。
【００６０】
（実施例７）
止水材として、図９に示したように、幅３０ｍｍ、　厚さ４．９ｍｍの長尺板状体４４の一側面に切り欠き部４５が形成され、切り欠き部４５内面に、１本の凸条４６の形成された架橋水膨張ゴム（３）層４７の両面に、厚さ０．０５ｍｍの無架橋ブチルゴム（４）層が積層されてなるセルフシール構造の止水材を用いた以外は実施例１で行ったと同様にして更生管を得た。
【００６１】
実施例４〜７で得られた更生管の止水性能を、０．１５ＭＰａまで水圧をかけた以外は実施例１で行ったと同様にして評価し、結果を表２に示した。尚、０．１５ＭＰａでも漏水しないものは０．１５ＭＰａと表示した。
【００６２】
【表２】

【００６３】
【発明の効果】
請求項１記載の更生管の管口止水構造の構成は上述の通りであり、既設管の管口と更生管の管口との間を略均一の厚さで周方向全域に亘ってシールする架橋ゴムよりなる止水材を介設させることで、更生管を既設管に対し拡径させて密着させた際に、その両者間の周方向においてほぼ均一の圧縮率を確保でき、既設管の管口と更生管の管口との間での止水性を十分に確保することができる。
【００６４】
しかも、架橋ゴムよりなる止水材を設けるに当たって、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することができる。
【００６５】
請求項２記載の更生管の管口止水構造の構成は上述の通りであり、架橋ゴムが硬度６０以下の超低硬度の架橋ブチルゴムであるから、老朽化した既設管の管口付近において発生している崩落やひび割れに対しゴムの変形により容易に追従し、既設管の管口と更生管の管口との間での止水性をさらに向上させることができる。
【００６６】
請求項３記載の更生管の管口止水方法の構成は上述の通りであり、更生管の拡径前の既設管の管口内周面または更生管の管口外周面にシール状の架橋ゴムよりなる止水材を略均一の厚さで周方向全域に亘って貼り付けておくので、更生管を拡径すれば、既設管の管口と更生管の管口との間に略均一の厚さで周方向全域に亘ってシールする架橋ゴムよりなる止水材を簡単に介設でき、既設管の管口と更生管の管口との間での止水性を十分に確保できるのはもちろんのこと、施工時間を短縮しつつ簡単かつ容易に施工することもできる。
【００６７】
請求項４記載の更生管の管口止水方法の構成は上述の通りであり、架橋ゴムが硬度６０以下の超低硬度の架橋ブチルゴムであるから、老朽化した既設管の管口付近において発生している崩落やひび割れに対しゴムの変形により容易に追従し、既設管の管口と更生管の管口との間での止水性をさらに向上させることができる。
【００６８】
請求項５記載の更生管の止水構造の構成は上述の通りであり、既設管の管口と更生管の管口との間には、その両者間を周方向全域に亘ってシールする、硬度８０以下の架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材が介設されているので、架橋水膨張性ゴムの反発弾性により、既設管の管口と更生管の管口との間での止水性が十分に確保されることになる。
【００６９】
又、施工後に水漏れが発生しそうになると、架橋水膨張ゴム層が水を吸収して膨張することにより止水効果が増強され、既設管の管口と更生管の管口との間での止水性がより十分に確保されることになる。
【００７０】
しかも、架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されているので、止水材は既設管の管口と更生管の管口により密着し、止水効果が優れていると共に、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することが可能となる。
【００７１】
請求項６記載の更生管の止水構造の構成は上述の通りであり、接着性又は粘着性材料が無架橋ブチルゴムであるから、老朽化した既設管の管口付近において発生している崩落やひび割れに対しゴムの変形により容易に追従し、既設管の管口と更生管の管口との間での止水性をさらに向上させることができる。
【００７２】
請求項７及び８記載の更生管の止水構造の構成は上述の通りであり、止水材の形状が、略長尺板状体であって、長さ方向に凸条が形成されている又はセルフシール構造であるから、止水材はその反発弾性により既設管の管口と更生管の管口により密着し、止水効果が更に向上する。
【００７３】
請求項９記載の更生管の管口止水方法の構成は上述の通りであり、更生管の拡径前の既設管の管口内周面または更生管の管口外周面に、硬度８０以下の架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されてなる止水材を、周方向全域に亘って貼り付けておくことで、更生管を拡径すれば、既設管の管口と更生管の管口との間の周方向全域に亘って上記止水材を介在させることができ、既設管の管口と更生管の管口との間での止水性を十分に確保できるのはもちろんのこと、施工時間を短縮しつつ簡単かつ容易に施工することもできる。
【００７４】
又、施工後に水漏れが発生しそうになると、架橋水膨張ゴム層が水を吸収して膨張することにより止水効果が増強され、既設管の管口と更生管の管口との間での止水性がより十分に確保されることになる。
【００７５】
しかも、架橋水膨張ゴム層の両面に接着性又は粘着性材料層が積層されているので、止水材は既設管の管口と更生管の管口により密着し、止水効果が優れていると共に、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することが可能となる。
【００７６】
請求項１０記載の更生管の止水方法の構成は上述の通りであり、接着性又は粘着性材料が無架橋ブチルゴムであるから、老朽化した既設管の管口付近において発生している崩落やひび割れに対しゴムの変形により容易に追従し、既設管の管口と更生管の管口との間での止水性をさらに向上させることができる。
【００７７】
請求項１１及び１２記載の更生管の止水方法の構成は上述の通りであり、止水材の形状が、略長尺板状体であって、長さ方向に凸条が形成されている又はセルフシール構造であるから、止水材はその反発弾性により既設管の管口と更生管の管口により密着し、止水効果が更に向上する。
【図面の簡単な説明】
【図１】本発明の実施形態に係る更生作業前の更生管を示す斜視図である。
【図２】更生管の製造工程を説明するための模式図である。
【図３】更生管を既設管の内部に引き込む更生管敷設工程を説明する模式図である。
【図４】（ａ）は埋設管内に更生管を引き込んだ状態を示す断面図である。
（ｂ）は更生管を加熱して形状回復させた状態を示す断面図である。
（ｃ）は更生管を加圧膨張させて埋設本管の内面に密着させた状態を示す断面図である。
【図５】更生管を既設管内にライニングするライニング工程を説明する模式図である。
【図６】更生管を拡径した状態での更生管の上流側マンホール側管口付近の断面図である。
【図７】水圧を加えて止水材の止水性を評価する実験を行う場合の既設管および更生管の概略断面図である。
【図８】実施例６で用いた架橋水膨張ゴム層の断面図である。
【図９】実施例７で用いた架橋水膨張ゴム層の断面図である。
【符号の説明】
１　　　　　　更生管
３　　　　　　既設管
４　　　　　　止水材[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water stop structure and a water stop method for a rehabilitation pipe in which a rehabilitation pipe for rehabilitating the inside of an existing pipe is made to stop water from the existing pipe.
[0002]
[Prior art]
Generally, a material such as FRP, vinyl chloride resin, or polyethylene resin is applied as a rehabilitation pipe for rehabilitating an existing pipe. When rehabilitating existing pipes that have collapsed or cracked using such rehabilitation pipes, sufficient waterproofness is secured in the area covered by the newly installed rehabilitation pipes, that is, in the pipeline. However, there is a problem with water stoppage near the mouth of the pipe that comes in contact with manholes.
[0003]
Therefore, before expanding the rehabilitation pipe by applying air pressure or the like to the existing pipe, that is, before bringing the rehabilitation pipe into close contact with the existing pipe, use a water-stopping material such as water-swelling rubber near the pipe opening of the existing pipe, or apply an epoxy Filling a waterproof material impregnated with a room temperature curable resin such as resin, and expanding the rehabilitation pipe with respect to the existing pipe, so that the water expansion rubber between the mouth of the existing pipe and the mouth of the rehabilitation pipe is filled. (See, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-3-282090
However, in the case of using a water-expandable rubber to shut off the pipe mouth, the reaction of the water-expanded rubber proceeds after the rehabilitation pipe is expanded and brought into close contact with the existing pipe, and the reaction proceeds between the rehabilitation pipe and the existing pipe. It becomes fluid in the axial direction of the tube. Therefore, the compression rate of the water-expandable rubber cannot be sufficiently obtained between the rehabilitation pipe and the existing pipe, and the water stoppage at the mouth of the rehabilitation pipe becomes insufficient, and the water cannot be stopped for a long time. There was a disadvantage.
[0006]
In the case of using a water-blocking material impregnated with a glass cloth or glass mat and a room-temperature-curable resin such as an epoxy resin, when the room-temperature-curable resin is cured, the resin becomes hard and cracks due to vibrations and the like, and water-stopping properties However, there was a defect that water could not be stopped for a long period of time.
[0007]
As another measure, after expanding the rehabilitation pipe to the existing pipe and bringing it into close contact with the existing rehabilitation pipe, filling the vicinity of the rehabilitation pipe with epoxy resin or mortar will stop the rehabilitation pipe at the mouth. Attempts have also been made to ensure aqueousness.
[0008]
However, in the case where epoxy resin, mortar, or the like is filled in the vicinity of the pipe mouth after the rehabilitation pipe is expanded, the number of steps after construction increases, and the construction time naturally increases.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of such a point, and an object of the present invention is to make it possible to easily and reliably secure water stoppage in the vicinity of the mouth of a rehabilitation pipe while shortening the construction time. An object of the present invention is to provide a water stop structure and a water stop method for a rehabilitation pipe.
[0010]
[Means for Solving the Problems]
The water stopping structure for a rehabilitating pipe according to claim 1 is a water stopping structure for a rehabilitating pipe in which an opening of the rehabilitating pipe for rehabilitating the inside of the existing pipe is stopped against the existing pipe. Between the pipe port and the pipe port of the rehabilitation pipe, there is provided a water-stopping material made of a crosslinked rubber which seals the both with a substantially uniform thickness over the entire circumferential direction. .
[0011]
Due to the water-stopping structure of the rehabilitation pipe, the water-stopping material made of crosslinked rubber that seals the gap between the mouth of the existing pipe and the mouth of the rehabilitation pipe with a substantially uniform thickness over the entire circumferential direction is used for the rehabilitation pipe. When the existing pipe is expanded and brought into close contact with the existing pipe, a substantially uniform compression ratio is secured in the circumferential direction between them, and sufficient water blocking between the existing pipe opening and the rehabilitation pipe opening is sufficient. Will be secured.
[0012]
In addition, since the water-stop material made of crosslinked rubber is interposed between the pipe port of the existing pipe and the pipe port of the rehabilitation pipe, after the rehabilitation pipe is expanded, the vicinity of the pipe port is filled with epoxy resin or mortar. Unlike the case, the number of steps after the construction does not increase and the construction time does not increase, and the construction can be performed easily and easily while shortening the construction time.
[0013]
The cross-linked rubber may be any cross-linked rubber conventionally used as a construction material, for example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber. (1,2-BR), styrene-butadiene rubber (SBR), styrene-butadiene-styrene block copolymer (SIS), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO), silicone rubber (Q), fluoro rubber (FKM, FZ), urethane rubber (U), etc. Cross-linked rubber.
[0014]
When the rubber becomes hard, the rubber deforms and becomes difficult to follow the collapse and cracks that have occurred near the mouth of the old pipe that has become deteriorated, and between the mouth of the existing pipe and the mouth of the rehabilitation pipe. The cross-linking is preferably performed to such an extent that the hardness is reduced to 80 or less, since the water stopping performance at the time is reduced.
[0015]
Among the crosslinked rubbers, the ultra-low hardness crosslinked butyl rubber having a hardness of 60 or less deforms and easily follows the collapse or crack generated near the mouth of the aging existing pipe. This is particularly preferable because the water stoppage between the port of the pipe and the port of the rehabilitation pipe is particularly excellent.
[0016]
A method for stopping water from a mouth of a rehabilitation pipe according to claim 3 is a method for stopping water from a mouth of a rehabilitation pipe for rehabilitating an existing pipe, with respect to the existing pipe. A water-stop material made of a cross-linked rubber in the form of a seal is attached to the inner peripheral surface of the existing pipe or the outer peripheral face of the rehabilitated pipe with a substantially uniform thickness over the entire circumferential direction before the pipe is expanded, Thereafter, by expanding the diameter of the rehabilitating pipe, the gap between the port of the existing pipe and the port of the rehabilitating pipe is brought into close contact with the water-stopping material and sealed.
[0017]
In other words, a water-stopping material made of a cross-linked rubber in a seal shape is adhered to the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the diameter expansion of the rehabilitating pipe in a substantially uniform thickness over the entire circumferential area. In addition, if the diameter of the rehabilitation pipe is expanded, the water-stop material made of cross-linked rubber that seals the entire area in the circumferential direction with a substantially uniform thickness between the existing pipe mouth and the rehabilitation pipe mouth can be easily obtained. In addition to ensuring sufficient water stoppage between the existing mouth of the existing pipe and the mouth of the rehabilitation pipe, it is easy and easy to construct while shortening the construction time. It is also possible to do.
[0018]
In addition, when a crosslinked butyl rubber having a hardness of 60 or less is used as the crosslinked rubber, the rubber deforms and easily follows collapses and cracks occurring near the mouth of the deteriorated existing pipe, Water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe is further improved.
[0019]
According to a fifth aspect of the present invention, there is provided a watertight structure for a rehabilitating pipe, wherein a port of the rehabilitating pipe for rehabilitating the inside of the existing pipe is watertight to the existing pipe. Between the mouth of the pipe and the mouth of the rehabilitation pipe, an adhesive or tacky material layer is laminated on both sides of a crosslinked water-expandable rubber layer having a hardness of 80 or less, which seals the entire area in the circumferential direction. Characterized in that a waterproof material is provided.
[0020]
The crosslinked water-swelling rubber is a rubber having a rubber-like elasticity in a dry state, and having a property of softening and swelling when absorbing water, and is generally a mixture of a water-absorbing resin and rubber.
[0021]
The water-absorbent resin is a polymer resin that can absorb and swell when contacted with water to form a gel, and a polymer resin obtained by partially crosslinking a water-soluble resin is used. Examples of the polymer resin include starch, cellulose, polyvinyl alcohol, a hydrophilic acrylic resin, a maleic anhydride resin, and a hydrophilic polyurethane resin.
[0022]
The above rubber is also a crosslinked product, and the aforementioned rubber crosslinked product can be used, but a crosslinked product of chloroprene rubber (CR) and styrene-butadiene-styrene block copolymer (SIS) is preferred.
[0023]
When the crosslinked water-swelling rubber is hardened, the rubber deforms and becomes difficult to follow the collapse or crack generated near the mouth of the existing pipe which has deteriorated, and the mouth of the existing pipe and the mouth of the rehabilitation pipe are hardened. The hardness is 80 or less, since the water stoppage between the two is reduced.
[0024]
The water-stopping material is formed by laminating an adhesive or tacky material layer on both sides of a cross-linked water-swelling rubber layer. As the adhesive or tacky material, an adhesive generally used conventionally as a construction material has been used. Alternatively, any adhesive may be used, and examples thereof include an adhesive and an adhesive of rubber type, acrylic type, epoxy type, urethane type, silicon type and the like, and non-crosslinked butyl rubber is preferably used.
[0025]
By the water stopping structure of the rehabilitation pipe, an adhesive or tacky material layer is laminated on both surfaces of a cross-linked water-swelling rubber layer that seals between the mouth of the existing pipe and the mouth of the rehabilitation pipe over the entire circumferential direction. When the rehabilitation pipe is expanded and brought into close contact with the existing pipe, the repellent elasticity of the cross-linked water-expandable rubber causes the waterproofing material to stop between the mouth of the existing pipe and the mouth of the rehabilitation pipe. Aqueous water will be sufficiently secured.
[0026]
In addition, when water leakage is likely to occur after construction, the cross-linked water-swelling rubber layer absorbs water and expands, thereby enhancing the water-stopping effect. Water stoppage is more sufficiently ensured.
[0027]
In addition, since the adhesive or tacky material layer is laminated on both sides of the crosslinked water-swelling rubber layer, the water-stopping material adheres more closely to the existing pipe opening and the rehabilitation pipe opening, and has an excellent water-stopping effect. In addition, unlike the case where epoxy resin or mortar is filled near the mouth of the pipe after the rehabilitation pipe is expanded, the number of steps after construction does not increase and the construction time does not increase. And it can be easily constructed.
[0028]
Furthermore, when the water-stopping material is a substantially long plate-like body and a ridge is formed in the length direction, the water-stopping material comes into close contact with the existing pipe port and the rehabilitation pipe port, and stops. The water effect is further improved.
[0029]
In addition, when the water-stopping material has a self-sealing structure, the water-stopping material comes into close contact with the existing port of the existing pipe and the port of the rehabilitation pipe, and the water-stopping effect is further improved. Note that the self-sealing structure is a structure that exerts a sealing force when water pressure is applied to the pipe port.
[0030]
The method for stopping water from a mouth of a rehabilitation pipe according to claim 9 is a method for stopping water from a mouth of a rehabilitation pipe for rehabilitating an existing pipe, with respect to the existing pipe. A water-stop material in which an adhesive or tacky material layer is laminated on both sides of a crosslinked water-expandable rubber layer having a hardness of 80 or less on the inner peripheral surface of the existing port or the outer peripheral surface of the rehabilitated pipe before the pipe is expanded. Is adhered over the entire circumferential direction at a substantially uniform thickness, and then the diameter of the rehabilitation pipe is increased, so that a gap between the mouth of the existing pipe and the mouth of the rehabilitation pipe is formed by the water stopping material. It is characterized by being closely contacted and sealed.
[0031]
That is, an adhesive or tacky material layer is laminated on both surfaces of a crosslinked water-expandable rubber layer having a hardness of 80 or less on the inner peripheral surface of the existing pipe before the diameter expansion of the rehabilitation pipe or the outer peripheral surface of the rehabilitation pipe. If the water-stopping material is attached over the entire circumferential area and the rehabilitation pipe is expanded, the water-stopper seals the entire circumferential area between the existing pipe mouth and the rehabilitation pipe mouth. The material is easily interposed, and the repulsive elasticity of the crosslinked water-swelling rubber ensures sufficient waterproofness between the mouth of the existing pipe and the mouth of the rehabilitation pipe. In addition, it is possible to easily and easily perform the construction while shortening the construction time.
[0032]
In addition, when water leakage is likely to occur after construction, the cross-linked water-swelling rubber layer absorbs water and expands, thereby enhancing the water-stopping effect. Water stoppage is more sufficiently ensured.
[0033]
In addition, since the adhesive or tacky material layer is laminated on both sides of the crosslinked water-swelling rubber layer, the water-stopping material adheres more closely to the existing pipe opening and the rehabilitation pipe opening, and has an excellent water-stopping effect. In addition, unlike the case where epoxy resin or mortar is filled near the mouth of the pipe after the rehabilitation pipe is expanded, the number of steps after construction does not increase and the construction time does not increase. And it can be easily constructed.
[0034]
Furthermore, when the water-stopping material is a substantially long plate-like body and has a ridge formed in the length direction or has a self-sealing structure, the water-stopping material is provided at the opening of the existing pipe and the pipe of the rehabilitation pipe. It adheres more closely to the mouth, further improving the water stopping effect.
[0035]
Next, a pipe mouth water stopping structure and a pipe mouth water stopping method of the present invention will be described with reference to the drawings.
[0036]
Fig. 1 shows a rehabilitating pipe used in a pipe mouth water stopping structure according to the present invention. The rehabilitating pipe 1 is made of a thermoplastic resin material such as a vinyl chloride resin and has a concave portion 11 extending along a longitudinal direction on an outer surface thereof. It is shaped to have a fold-like shape that is deformed to have a reduced cross-sectional outer area.
[0037]
Further, the rehabilitation pipe 1 has a performance of being recovered to a cylindrical shape by being heated to a predetermined shape recovery temperature (for example, 80 ° C.). In this case, the shape recovery temperature is a temperature at which the shape recovers to a cylindrical shape only by heating without applying an external force such as pressure.
[0038]
The method of manufacturing the rehabilitation pipe 1 is as follows. As shown in FIG. 2, first, a cylindrical body 10 of a thermoplastic resin material is extruded by an extruder 21, and the cylindrical body 10 is cooled by passing through a cooling water tank 22. The outer surface is crushed in an atmosphere at the recovery temperature to form a concave portion 11 extending along the longitudinal direction on the outer surface as shown in FIG. Thereafter, the cylindrical body 10 is pulled by the pulling device 24 so as to reduce the cross-sectional outer area, and the cylindrical body 10 is wound up on the drum 26 via the traverse portion 25.
[0039]
Until the rehabilitated pipe 1 manufactured in this way is carried into the rehabilitation site of the existing pipe, restraining means is used so that the pipe itself does not "restore its natural shape" under the influence of the outside air temperature. It is preferable to restrain using or store at low temperature.
[0040]
Next, the rehabilitation work of the existing pipe will be described. Here, as shown in FIG. 3, the existing pipe 3 embedded between the upstream manhole Q1 (the manhole located on the left side in FIG. 3) and the downstream manhole Q2 (the manhole located on the right side in FIG. 3). Will be described.
[0041]
The rehabilitation pipe 1 wound on the drum 26 is carried in on the ground near the upstream manhole Q1. On the other hand, a winch 51 is provided on the ground near the downstream manhole Q2. A guide portion 52 for guiding a wire 54 for pulling the rehabilitation pipe 1 is provided below the downstream manhole Q2. Prior to inserting the rehabilitating pipe 1 into the existing pipe 3, the inside of the existing pipe 3 is washed and protrusions are removed in advance.
[0042]
First, as a water-stopping material installation step, a sheet-shaped water-stopping material 4 is stuck on the inner peripheral surface of a pipe opening of the existing pipe 3 before expanding the rehabilitating pipe 1 over the entire area in the circumferential direction with a substantially uniform thickness. deep. The surface on the front side (rehabilitation pipe 1 side) of the water blocking material 4 is covered with a pet film (not shown). At this time, the width of the water blocking material 4 (the dimension in the axial direction of the existing pipe 3) is set to about 20 to 50 mm.
[0043]
Next, as a rehabilitation pipe laying step, as shown in FIG. 3, the tip of the wire 54 led out from the winch 51 is guided from the lower end of the downstream manhole Q2 to the lower end of the upstream manhole Q1 via the existing pipe 3. . Then, the drum 26 is rotated, and the tip of the rehabilitation pipe 1 is led out to the lower end of the upstream manhole Q1, that is, the upstream end of the existing pipe 3.
[0044]
Then, in the upstream manhole Q <b> 1, a tip 53 is attached to the tip of the rehabilitation pipe 1, and the tip of the wire 54 extending from the winch 51 is locked to the tip 53. Thereafter, with the tip of the rehabilitation pipe 1 sent out from the drum 26 inserted into the existing pipe 3, the rehabilitation pipe 1 is pulled by winding the wire 54 with the winch 51, and the rehabilitation pipe 1 is connected to the existing pipe 3. I draw inside.
[0045]
By this operation, the rehabilitation pipe 1 is guided from the upstream manhole Q1 side to the downstream manhole Q2 side, and is laid over the entire length of the existing pipe 3 connecting the upstream manhole Q1 and the downstream manhole Q2.
[0046]
FIG. 4A shows an arrangement state of the rehabilitation pipe 1 in the existing pipe 3 at this time. At this time, since the front surface of the water-stopping material 4 is covered with the pet film, the water-stopping material 4 is rehabilitated by the operation of the winch 51 pulling the rehabilitation pipe 1 into the existing pipe 3 via the wire 54. The rehabilitation pipe 1 can be smoothly pulled in without being dragged by the pipe 1 and the wire 54. Thereafter, the pet film covering the front surface of the water blocking material 4 is peeled off.
[0047]
After that, it proceeds to the lining step. In this lining step, as shown in FIG. 5, a steam generator / pressurizer 55 is provided on the ground near the upstream manhole Q1, and a water / steam separator 56 is provided on the ground near the downstream manhole Q2. . An elbow 57 is connected to the rear end of the rehabilitation pipe 1, a hose 55 a extending from the steam generating / pressurizing unit 55 is connected to the elbow 57, and a hose extending from the water / steam separator 56 is connected to the tip 53 at the tip of the rehabilitation pipe 1. 56a. Further, a temperature sensor (not shown) is attached to the elbow 57 and the tip tool 53.
[0048]
In this state, steam is continuously supplied into the rehabilitation pipe 1 from the steam generator / pressurizer 55, and the rehabilitation pipe 1 is heated from the inside to the shape recovery temperature while flowing the steam to the water / steam separator 56. Then, the shape is restored to the substantially original cylindrical body. FIG. 4B shows the state of the rehabilitation pipe 1 in the existing pipe 3 at this time.
[0049]
After the rehabilitation pipe 1 is restored to the cylindrical shape in this way, the tip tool 53 is closed, and heated and compressed air is sent from the steam generation / pressurizer 55 into the rehabilitation pipe 1 as shown in FIG. As described above, the rehabilitating pipe 1 is heated and pressurized and expanded from the inside thereof and is brought into close contact with the inner surface of the existing pipe 3 (the state of the rehabilitating pipe 1 in the existing pipe 3 at this time is shown in FIG. 4 (c)). In the pressurized state, the cooling and fixing are performed, and the lining work on the inner surface of the existing pipe 3 is completed.
[0050]
At this time, the water-stopping material 4 adhered to the inner peripheral surface of the existing pipe 3 at a substantially uniform thickness in the entire circumferential direction before the rehabilitation pipe 1 is expanded by the pressurized expansion of the rehabilitation pipe 1. Between the pipe ports at both ends of the rehabilitation pipe 1 and the pipe ports at both ends of the existing pipe 3 so as to be able to secure watertightness over the entire circumferential direction, and the pipe ports at both ends of the rehabilitation pipe 1 are connected to both ends of the existing pipe 3. A sealing step for sealing the pipe port is performed.
[0051]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, examples of the present invention will be described, but the present invention is not limited to the following examples.
[0052]
(Examples 1-3, Comparative Examples 1-3)
After sticking the water-stopping material of a long plate-like body of 50 mm in width and 5 mm in thickness shown in Table 1 on the inner surface of both ends of an existing pipe made of a fume pipe with an inner diameter of 250 mm, The rehabilitation pipe made of a resin pipe was deformed as shown in FIG. 1 and inserted into a fume pipe.
[0053]
Next, as shown in FIG. 5, steam is supplied by a steam generator / pressurizer to recover the shape of the polyvinyl chloride resin tube to a substantially original cylindrical shape, and further, heated and compressed air is sent by the steam generator / pressurizer. Then, the vinyl chloride resin tube was heated and pressurized and expanded, and brought into close contact with the inner surface of the fume tube to obtain a rehabilitated tube.
[0054]
The water stopping performance of the obtained rehabilitation pipe was evaluated, and the results are shown in Table 1. The evaluation method is as follows.
[0055]
As shown in FIG. 7, a pressure gauge 6 is installed between the existing pipe 3 and the rehabilitation pipe 1 to apply a water pressure up to 0.10 MPa by a pump and measure the water pressure between the existing pipe 3 and the rehabilitation pipe 1. The leak pressure was measured by means of Those which did not leak even at 0.10 MPa were indicated as 0.10 MPa.
[0056]
[Table 1]

[0057]
Crosslinked butyl rubber (1); hardness 60,
Crosslinked butyl rubber (2); hardness 20,
Crosslinked water-swellable rubber (3); urethane-based crosslinked water-swellable rubber, hardness 60
Non-crosslinked water-swellable rubber (5);
[0058]
(Examples 4 and 5)
Adhesion shown in Table 2 having a thickness of 0.05 mm to both surfaces of a long plate-like crosslinked water-expandable rubber having a width of 30 mm and a thickness of 4.9 mm made of a crosslinked water-expandable rubber (3) as a water-stopping material A rehabilitated tube was obtained in the same manner as in Example 1 except that a water-stopping material having a layer of agent was used.
[0059]
(Example 6)
As shown in FIG. 8, a crosslinked water-swelling rubber in which two ridges 42 having a height of 4 mm are formed on one surface of a long plate-like body 41 having a width of 30 mm and a thickness of 4.5 mm, as shown in FIG. (3) A rehabilitating pipe was prepared in the same manner as in Example 1 except that a rib-shaped water-stopping material having a 0.05 mm-thick non-crosslinked butyl rubber (4) layer laminated on both surfaces of the layer 43 was used. Obtained.
[0060]
(Example 7)
As shown in FIG. 9, a cutout 45 is formed on one side surface of a long plate-like body 44 having a width of 30 mm and a thickness of 4.9 mm as a water stopping material. Except for using a self-sealing water-stopping material in which a non-crosslinked butyl rubber (4) layer having a thickness of 0.05 mm is laminated on both surfaces of the crosslinked water-expandable rubber (3) layer 47 on which the ridges 46 are formed. A rehabilitated tube was obtained in the same manner as in Example 1.
[0061]
The water stopping performance of the rehabilitation pipes obtained in Examples 4 to 7 was evaluated in the same manner as in Example 1 except that the water pressure was applied up to 0.15 MPa, and the results are shown in Table 2. Those which did not leak even at 0.15 MPa were indicated as 0.15 MPa.
[0062]
[Table 2]

[0063]
【The invention's effect】
The structure of the water stop structure of the rehabilitation pipe according to claim 1 is as described above, and the gap between the existing pipe and the rehabilitation pipe is sealed with a substantially uniform thickness over the entire circumferential direction. When the rehabilitating pipe is expanded in diameter and closely attached to the existing pipe, a substantially uniform compression ratio in the circumferential direction between the two can be secured by interposing a waterproof material made of cross-linked rubber. Water stoppage between the port of the rehabilitation pipe and the port of the rehabilitation pipe can be sufficiently ensured.
[0064]
Moreover, in providing the water-blocking material made of the crosslinked rubber, the number of steps after the construction is not increased and the construction time is not increased, and the construction can be performed easily and easily while shortening the construction time.
[0065]
The structure of the water blocking structure of the rehabilitation pipe according to the second aspect is as described above. Since the crosslinked rubber is an ultra-low hardness crosslinked butyl rubber having a hardness of 60 or less, it is generated in the vicinity of the pipe port of the existing pipe that has deteriorated. It is possible to easily follow the collapse or crack that has occurred by the deformation of the rubber, and to further improve the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe.
[0066]
The configuration of the method for stopping water from the mouth of a rehabilitating pipe according to claim 3 is as described above, and a seal-like crosslinked rubber is provided on the inner peripheral surface of the existing rehabilitating pipe or the outer peripheral face of the rehabilitating pipe before the expansion of the rehabilitating pipe. Since the water-stopping material is adhered over the entire area in the circumferential direction at a substantially uniform thickness, if the diameter of the rehabilitation pipe is increased, a substantially uniform gap is formed between the mouth of the existing pipe and the mouth of the rehabilitation pipe. A waterproof material made of cross-linked rubber, which seals over the entire area in the circumferential direction with a thickness, can be easily interposed, and sufficient waterproofness between the existing mouth of the existing pipe and the mouth of the rehabilitation pipe can be secured. Of course, it is also possible to easily and easily carry out the construction while reducing the construction time.
[0067]
The structure of the method for stopping water from the mouth of a rehabilitating pipe according to claim 4 is as described above. Since the crosslinked rubber is an ultra-low hardness crosslinked butyl rubber having a hardness of 60 or less, it is generated in the vicinity of the mouth of an existing pipe that has deteriorated. It is possible to easily follow the collapse or crack that has occurred by the deformation of the rubber, and to further improve the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe.
[0068]
The configuration of the water stopping structure of the rehabilitation pipe according to claim 5 is as described above, and between the port of the existing pipe and the port of the rehabilitation pipe, both are sealed over the entire circumferential direction. Since a water-stopping material in which an adhesive or tacky material layer is laminated on both sides of a crosslinked water-expandable rubber layer having a hardness of 80 or less is interposed, the port of the existing pipe is opened due to the rebound resilience of the crosslinked water-expandable rubber. Water repellency between the pipe and the mouth of the rehabilitation pipe is sufficiently ensured.
[0069]
In addition, when water leakage is likely to occur after construction, the cross-linked water-swelling rubber layer absorbs water and expands, thereby enhancing the water-stopping effect. Water stoppage is more sufficiently ensured.
[0070]
In addition, since the adhesive or tacky material layer is laminated on both sides of the crosslinked water-swelling rubber layer, the water-stopping material adheres more closely to the existing pipe opening and the rehabilitation pipe opening, and has an excellent water-stopping effect. In addition, unlike the case where epoxy resin or mortar is filled near the mouth of the pipe after the rehabilitation pipe is expanded, the number of steps after construction does not increase and the construction time does not increase. And it can be easily constructed.
[0071]
The structure of the water blocking structure of the rehabilitating pipe according to claim 6 is as described above, and since the adhesive or tacky material is non-crosslinked butyl rubber, the collapse or collapse occurring near the mouth of the old pipe that has been deteriorated. Cracks can be easily followed by deformation of the rubber, and the water stoppage between the existing mouth of the existing pipe and the mouth of the rehabilitation pipe can be further improved.
[0072]
The structure of the water stopping structure of the rehabilitation pipe according to claims 7 and 8 is as described above, and the shape of the water stopping material is a substantially long plate-like body, and a ridge is formed in the length direction. Alternatively, because of the self-sealing structure, the water-stopping material comes into close contact with the port of the existing pipe and the port of the rehabilitation pipe due to its rebound resilience, and the water-stopping effect is further improved.
[0073]
The structure of the method for stopping water from the mouth of a rehabilitating pipe according to claim 9 is as described above, and the hardness of the inner wall of the existing pipe or the outer circumferential face of the rehabilitating pipe before the expansion of the rehabilitating pipe is 80 or less. If the diameter of the rehabilitation pipe is increased by pasting a water-stopping material in which an adhesive or tacky material layer is laminated on both sides of the cross-linked water-swelling rubber layer over the entire circumferential direction, the pipe of the existing pipe can be used. The water-stopping material can be interposed over the entire circumferential area between the mouth and the mouth of the rehabilitation pipe, and the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe is sufficiently secured. Not only can it be done, but it can also be done easily and easily while reducing the construction time.
[0074]
In addition, when water leakage is likely to occur after construction, the cross-linked water-swelling rubber layer absorbs water and expands, thereby enhancing the water-stopping effect. Water stoppage is more sufficiently ensured.
[0075]
In addition, since the adhesive or tacky material layer is laminated on both sides of the crosslinked water-swelling rubber layer, the water-stopping material adheres more closely to the existing pipe opening and the rehabilitation pipe opening, and has an excellent water-stopping effect. In addition, unlike the case where epoxy resin or mortar is filled near the mouth of the pipe after the rehabilitation pipe is expanded, the number of steps after construction does not increase and the construction time does not increase. And it can be easily constructed.
[0076]
The configuration of the method for stopping water of a rehabilitating pipe according to claim 10 is as described above. Since the adhesive or tacky material is a non-crosslinked butyl rubber, the collapse or collapse occurring near the mouth of the deteriorated existing pipe can be prevented. The crack can be easily followed by the deformation of the rubber by the deformation of the rubber, and the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe can be further improved.
[0077]
The structure of the method for stopping water of a rehabilitation pipe according to claims 11 and 12 is as described above, and the shape of the water stopping material is a substantially long plate-like body, and a ridge is formed in the length direction. Alternatively, because of the self-sealing structure, the water-stopping material comes into close contact with the port of the existing pipe and the port of the rehabilitation pipe due to its rebound resilience, and the water-stopping effect is further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rehabilitation pipe before a rehabilitation operation according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining a manufacturing process of a rehabilitation pipe.
FIG. 3 is a schematic diagram illustrating a rehabilitation pipe laying step of drawing a rehabilitation pipe into an existing pipe.
FIG. 4A is a sectional view showing a state in which a rehabilitation pipe is drawn into a buried pipe.
(B) is a sectional view showing a state in which the rehabilitation pipe is heated to recover its shape.
(C) is a cross-sectional view showing a state in which the rehabilitation pipe is pressurized and expanded and is brought into close contact with the inner surface of the buried main pipe.
FIG. 5 is a schematic diagram illustrating a lining step of lining a rehabilitation pipe in an existing pipe.
FIG. 6 is a cross-sectional view of the rehabilitation pipe in the vicinity of the upstream manhole-side mouth of the rehabilitation pipe in a state where the diameter of the rehabilitation pipe is expanded.
FIG. 7 is a schematic cross-sectional view of an existing pipe and a rehabilitating pipe in a case where an experiment for evaluating the water stopping performance of a water stopping material by applying a water pressure is performed.
FIG. 8 is a cross-sectional view of a crosslinked water-swellable rubber layer used in Example 6.
FIG. 9 is a cross-sectional view of a crosslinked water-swellable rubber layer used in Example 7.
[Explanation of symbols]
1 Rehabilitation pipe 3 Existing pipe 4 Waterproof material

Claims

A watertight structure for a rehabilitation pipe which has a rehabilitation pipe that rehabilitates an existing pipe, so that the rehabilitation pipe has a water stop relative to the existing pipe.
A water-stop material made of a crosslinked rubber is provided between the pipe port of the existing pipe and the pipe port of the rehabilitation pipe, which seals the both with a substantially uniform thickness over the entire circumferential direction. The water blocking structure of the rehabilitation pipe.

2. The water blocking structure for a rehabilitation pipe according to claim 1, wherein the crosslinked rubber is an ultra-low hardness crosslinked butyl rubber having a hardness of 60 or less.

A method for stopping water of a rehabilitation pipe, wherein the mouth of the rehabilitation pipe for rehabilitating the existing pipe is stopped against the existing pipe,
A water-stopping material made of a cross-linked rubber having a substantially uniform thickness is adhered to the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the diameter expansion of the rehabilitating pipe in a substantially uniform thickness over the entire circumferential direction. Every
After that, by expanding the diameter of the rehabilitation pipe, the gap between the mouth of the existing pipe and the hedge of the rehabilitation pipe is brought into close contact with the water-stopping material rubber to seal the water. Method.

4. The method according to claim 3, wherein the crosslinked rubber is an ultra-low hardness crosslinked butyl rubber having a hardness of 60 or less.

A watertight structure for a rehabilitation pipe which has a rehabilitation pipe that rehabilitates an existing pipe, so that the rehabilitation pipe has a water stop relative to the existing pipe.
Between the mouth of the existing pipe and the mouth of the rehabilitation pipe, an adhesive or tacky material layer is provided on both sides of a crosslinked water-swelling rubber layer having a hardness of 80 or less, which seals the entire area in the circumferential direction. A water blocking material formed by laminating is interposed, and a water stopping structure for a rehabilitating pipe.

6. The water blocking structure for a rehabilitation pipe according to claim 5, wherein the adhesive or tacky material is a non-crosslinked butyl rubber.

7. The water blocking structure for a rehabilitation pipe according to claim 5, wherein the water stopping material is a substantially long plate-like body, and a ridge is formed in a length direction.

The water stop structure of a rehabilitation pipe according to claim 5 or 6, wherein the water stop material has a self-sealing structure.

A method for stopping water of a rehabilitation pipe, wherein the mouth of the rehabilitation pipe for rehabilitating the existing pipe is stopped against the existing pipe,
A stopper formed by laminating an adhesive or tacky material layer on both sides of a crosslinked water-expandable rubber layer having a hardness of 80 or less on the inner peripheral surface of an existing pipe before the expansion of the rehabilitating pipe or on the outer peripheral face of the rehabilitation pipe. Paste the water material over the entire circumferential area,
Thereafter, by expanding the diameter of the rehabilitation pipe, the gap between the mouth of the existing pipe and the rehabilitation pipe is brought into close contact with the water stopping material to seal the rehabilitation pipe. .

The method according to claim 9, wherein the adhesive or tacky material is a non-crosslinked butyl rubber.

The method according to claim 9 or 10, wherein the water-stopping material is a substantially long plate-like body, and a ridge is formed in a length direction.

The method according to claim 9 or 10, wherein the water-stopping material has a self-sealing structure.