JP3855096B2

JP3855096B2 - Pipeline lining method

Info

Publication number: JP3855096B2
Application number: JP29543199A
Authority: JP
Inventors: 雅敏石川; 信二大西; 太司槇本; 真史堅田; 孝治麻生
Original assignee: Ashimori Industry Co Ltd; Ashimori Engineering Co Ltd
Current assignee: Ashimori Industry Co Ltd; Ashimori Engineering Co Ltd
Priority date: 1999-10-18
Filing date: 1999-10-18
Publication date: 2006-12-06
Anticipated expiration: 2019-10-18
Also published as: JP2001113600A

Description

【０００１】
【発明の属する技術分野】
本発明は、下水道管などの管路で、しかも断面形状が円形でない異形管路の内張り方法に関し、管路内で人が作業可能な口径８００ｍｍ以上の大口径異形管路の施工に適した内張り方法に関する。
【０００２】
【従来の技術】
下水道管をはじめとする地中埋設管等の既設管路を補修する方法として、従来、熱硬化性樹脂を含浸させた未硬化状態の柔軟な円筒状もしくはシート状の内張り材を管路内に設置し、その内張り材の内側に挿入したチューブ等を膨張させる等によって、内張り材を拡張させて管路の内周面に密着させた後、熱硬化性樹脂を硬化させて、既設管路内で新たなパイプを形成する、いわゆるソフトライニング工法と称される管路の内張り方法が主として採用されている。
【０００３】
【発明が解決しようとする課題】
以上のようなソフトライニング工法では、以下の理由により大口径管路には適用されていない。第一に、内張り材の径寸法は管路径に合わせて大きくなり、マンホール（口径６００ｍｍ）を介して管路内に挿入することが困難となる。第二に、寸法が大きくなることで、大型の運搬車を使わなければ現場への搬入を行うことができなくなり、狭い道路での実施が困難となる。このようなことから、ソフトライニング工法は口径１０００ｍｍ程度までが、現実的に適用可能な管路径となっている。
【０００４】
ところで、大口径管路は、現在主流となっている円管以外の形状の管路が少なくない。例えば、東京都や大阪市などの大都市では古く戦前から下水道管を埋設しており、その形状はトンネル形状の馬蹄形や矩形等、異形形状が多い。このような異形形状の管路の特徴として、管の下部が平坦となっており、その平坦部分の両端の角隅部は直角に近い形状となっている。このような管路にソフトライニング工法を適用し、柔軟な内張り材を管路内で拡張させても、内張り材は大口径管に適用させるべくある程度以上の厚みが必要で樹脂の未硬化状態でも剛性が高くなっているため、内部圧力によっては上記の角隅部にうまく沿わず、皺が生じたり、管内面との間に隙間が生じることが多く、従って、このような異形形状の管路に対してはソフトライニング工法の適用が困難である。
【０００５】
本発明の目的は、大口径の異形管路に対して、皺や隙間を生じさせることなく的確に内張りを施すことのできる管路の内張り方法を提供することにある。
【０００６】
【課題を解決するための手段】
上記の目的を達成するため、本発明の管路の内張り方法は、断面形状が異形の既設管からなる管路を補修すべく、その内周面を被覆する方法であって、管路の下部に、当該管路下部形状に対応する形状に成形された繊維強化樹脂からなる成形パネルを設置する一方、管路の上部には、熱硬化性樹脂を含浸させた未硬化の柔軟なシート状内張り材を配置して密着させた後に硬化させるとともに、このシート状内張り材と上記成形パネルとが、それぞれの周方向両端部において相互に重なるように内張りすることによって特徴づけられる（請求項１）。
【０００７】
本発明においては、上記成形パネルとして、筒長方向および／または周方向に複数個に分割されたものを用い、これらを管路内で組み立てて管路下部表面に沿わせる方法を採用することができる（請求項２）。
【０００８】
また、本発明においては、成形パネルと管路下部表面との間に生じた隙間に、裏込め材を注入する方法を採用することもできる（請求項３）。
【０００９】
更に、本発明においては、成形パネルの管路下部表面に向く面にあらかじめリブ材を一体化しておくことにより、管路下部に設置した成形パネルと管路下部表面との間に隙間を形成し、その隙間に裏込め材を注入してもよい（請求項４）。
【００１０】
また、本発明においては、管路下部にあらかじめ複数のリブ材を設置した後、そのリブ材の上に記成形パネルを設置して当該リブ材と成形パネルとを一体化し、リブ材により生じた管路下部表面と成形パネルとの間の隙間に裏込め材を注入してもよい（請求項５）。
【００１１】
また、請求項４または５に係る発明を採用する場合、請求項４または５におけるリブ材に緊締部材を管路筒長方向に貫通させ、その緊締結部材により複数のリブ材を管路筒長方向に連結し、その緊締部材を介して各リブ材または各リブ材と一体化している各成形パネルを順次管路内に引き込んで設置する方法を採用することができる（請求項６）。
【００１２】
そして、以上の請求項４、５または６に記載の発明を採用する場合、成形パネルの設置の途中段階もしくは設置後に、各リブ材に貫通させた緊締部材を緊締することによって各成形パネルを管路筒長方向に一体化する方法を採用することができる（請求項７）。
【００１３】
本発明は、ソフトライニング工法における問題点である、大口径管に対する適用の困難性と、異形管の特に角隅部に対する内張り材の管内面に対する密着の困難性を同時に解消するものである。
【００１４】
すなわち、内張り材を管路の上部と下部に対応させて周方向に２分割することで、大口径管の内張りに際しても内張り材の寸法増大および重量増大を回避し、マンホールを介しての管路内への引き込みを可能とするとともに、現場への搬入に大型車を用いる必要をなくすることができる。
【００１５】
また、異形管において特に角隅部が存在する管路下部には、あらかじめその形状に沿うように成形した繊維強化樹脂の成形パネルからなる内張り材を設置するため、内張り後の管路内面に皺が生じない。ここで、断面が矩形の管（ボックスカルバート管）においては、管路上部にも角隅部が存在し、本発明においては管路上部は従来のソフトライニング工法と同等の柔軟なシート状内張り材を拡張して硬化させる関係上、管路上部の角隅部において若干の皺が生じることになるが、管路内を流れる汚水や雨水は、通常、管路の２／３程度の高さまでの流量であり、管路上部の角隅部近傍に発生する皺については特に問題とならない。なお、矩形管の上部の角隅部において管内面との間に隙間が生じた場合には、モルタルなどにより裏込めを実施することが好ましい。
【００１６】
そして、管路下部に設置する成形パネルについては、請求項２に係る発明のように、管路の筒長方向や周方向に分割したものを用い、管路内で組み立てるようにすれば、補修対象管路の口径に係わらず広く本発明を適用することが可能となる。
【００１７】
また、請求項３に係る発明のように、管路下部に設置した成形パネルと、管路下部表面との間に裏込め材を注入する方法を採用すると、既設管内面の腐食等がひどくても、成形パネルと管路内面とを一体化することができ、強度面や水密性等の性能も向上する。
【００１８】
請求項４および５に係る発明は、管路下部表面に段差や曲がり等で不陸を生じている場合に有効な方法であり、あらかじめ成形パネルにリブ材を一体化しておくか（請求項４）、あるいは管路下部表面にあらかじめリブ材を設置した後にその上に成形パネルを設置して一体化し（請求項５）、リブ材の介在により管路下部表面と成形パネルとの間に意図的に全面的に設けた隙間に裏込め材を注入することで、管路の不陸をある程度直線的に補正すると同時に、成形パネルを管路下部表面に対して一体化することができる。
【００１９】
ここで、請求項４に係る発明のように、成形パネルに対してあらかじめリブ材を一体化しておくと、作業環境の悪い管路内作業を少なくすることができるという利点がある一方、請求項５に係る発明のように、リブ材を管路下部表面に設置した後に成形パネルを設置して一体化する方法では、複雑な管路内面形状に対応することができるという利点がある。なお、この場合、リブ材の設置時に管路下部表面の補修作業（段差の削りや落ち込み部の均し作業等）の併用を妨げるものではない。
【００２０】
また、以上のようなリブ材を用いる場合において、請求項６に係る発明のように、各リブ材を、管路筒長方向に沿うワイヤやシャフト等の緊締部材により一体化することにより、リブ材もしくはそれと一体化されている成形パネルの管路内への設置作業を容易化することができる。
【００２１】
更に、請求項７に係る発明のように、各リブ材を管路筒長方向に連結している緊締部材を、成形パネルの設置途中や設置完了後に緊締して、リブ材に一体化された成形パネルを管路筒長方向に一体化すると、管路筒長方向に強固に固定された内張り材を構築することができる。
【００２２】
【発明の実施の形態】
以下、図面を参照しつつ本発明の実施の形態について説明する。
図１〜図４は、本発明方法を適用して内張りされた管路の構造を示す模式的断面図で、管路の筒長方向に直交する面で切断して示す図である。これらの各例は、断面が馬蹄形の既設管Ｐに対して本発明を適用したものであり、各例とも、既設管Ｐの下半部は、あらかじめ当該既設管Ｐの下半部の形状に沿うように成形された成形パネル１によって被覆されているとともに、上半部はシート状内張り材２によって被覆されており、このシート状内張り材２は、熱硬化性樹脂を含浸させた未硬化状態において既設管Ｐ内に引き込み、その上半部に密着させた後に硬化させたものである。
【００２３】
そして、成形パネル１とシート状内張り材２は、その周方向両端部において所定長さにわたって相互に重なり合っている。その成形パネル１とシート状内張り材２との重ね合わせ部Ｌの形態としては、図１に示すように単純に重ね合わせる場合のほか、図２に示すように、成形パネル１の周方向両端部の表面に段部１ａを形成しておき、その段部１ａにシート状内張り材２の両端部が納まるようにする構造、あるいは、図３に示すように、単純に重ね合わせるのであるが、シート状内張り材２の周方向両端を馬蹄形の既設管Ｐの下面の角隅部ＣＰにまで至らせた構造等を採用することができる。
【００２４】
また、既設管Ｐの腐食が進行し、成形パネル１をその下半部に適切に沿わせて設置できない場合には、図４に示すように、成形パネル１と既設管Ｐの下半部表面との間にリブ材３を配置し、それによって生じた隙間に裏込め材を注入する構造を採用することが望ましい。
【００２５】
以上の各例における成形パネル１は、既設管Ｐの筒長方向や周方向に適宜に分割したものを組み立てて一体化したものであり、その分割の形態については、図４の施工例を例にとってそのＡ−Ａ断面図で示せば、図５に模式的に示すように既設管Ｐの筒長方向にのみ分割する形態や、図６に模式的に示すように筒長方向および周方向に分割し、筒長方向への分割面が交互に位置するように配置する形態等を採用することができる。
【００２６】
各成形パネル１の設置に際しては、図７に図４におけるＢ−Ｂ拡大図を、また、図８には図５におけるＡ部拡大図を示すように、互いに隣接するものどうしが重なり合うようにそれぞれの端部に段部１ａを形成しておくことが好ましく、また、その重なり合った箇所には水膨張性のシーラント材やエポキシ樹脂等の目止め材４で処理を行い、水密性や耐薬品性を向上させることが望ましい。なお、図７および図８において５は裏込め材である。
【００２７】
また、成形パネル１と既設管Ｐの下半部表面との間の隙間が大きい場合には、図４に示すようなリブ材３を設置することが望ましく、このリブ材３は、例えばＣ形鋼材を好適に用いることができる。また、リブ材３には、図７に示すような貫通孔３ａを適宜間隔で形成しておけば、アンカー効果により裏込め材５との一体化が増大して好ましい。なお、リブ材３としては、一般的なプラスチック板からリブが突出した構造のものを用いてもよい。
【００２８】
リブ材３は、あらかじめ工場等において成形パネル１と一体化しておいてもよいし、リブ材３を既設管Ｐの下半部表面に設置してから成形パネル１を設置して一体化してもよい。通常はあらかじめリブ材３を成形パネル１に一体化しておくことが作業上好ましいが、管路内面の腐食がひどいときや、蛇行や折れ曲がりが生じている場合などは現場合わせで作業を進めるほうが効率的なこともあり、あらかじめ管路状況を調査して、いずれの手法を採用するかを適宜に選択すればよい。
【００２９】
また、リブ材３と成形パネル１との一体化の方法としては、図８に示すようなボルト６およびナット７で固定する方法（ナット７を使用しない場合もあり得る）や、接着によるもの、あるいは構造的に相互に嵌合するようにしてもよい。
【００３０】
リブ材３を用いる場合、図５に示すように、リブ材３に形成した貫通孔３ａの幾つかおきに、ワイヤ等の緊締部材８を管路筒長方向に貫通させ、各リブ材３並びにそれに一体化された成形パネル１を筒長方向に連結することができる。緊締部材８としては、ワイヤのほかにシャフトを採用することもでき、既設管Ｐに段差や曲がりが生じている場合には、フレキシブルなワイヤを使用することが好ましい。また、補修対象管路の全長にわたって通す緊締部材をワイヤとし、幾つかの成形パネル１を合体させるために通す緊締部材をシャフトとすることも可能である。また、この緊締部材は、各リブ材３およびそれに一体化された各成形パネル１を管路の筒長方向に緊締する役割を担うものであるから、少なくとも１本ないしは数本の緊締部材については、補修対象管路の全長に渡る長さのものとすることが好ましい。
【００３１】
なお、図６に示す例においては、リブ材３を既設管Ｐに設置した後に成形パネル１を設置して一体化するが、この場合においても、各リブ材３を管路筒長方向に貫通する緊締部材で連結しておいてもよい。
【００３２】
以上の各施工例において、成形パネル１は繊維強化樹脂の成形体であって、その構造としては、図９にその模式的断面図を示すように、ポリエステル繊維やポリオレフィン繊維等のシート状不織布１１の表裏両面に、ガラスロービングクロス等のシート状織布１２を配置し、その全体に例えば不飽和ポリエステル樹脂等の熱硬化性樹脂を含浸させ、金型内で硬化させた構造のもの等を採用することができる。
【００３３】
シート状内張り材２についても、成形パネル１と同等の構造のものを採用することができ、シート状不織布の表裏両面にガラスロービングクロス等のシート状織布を配置したものに不飽和ポリエステル樹脂等の熱硬化性樹脂を含浸させ、樹脂が未硬化の柔軟な状態で既設管Ｐ内に引き込み、後述するように拡張チューブ等を用いて拡張させて既設管Ｐの上半部に密着させ、その状態で加熱硬化させたものである。
【００３４】
次に、以上の各施工例の構造を得るための本発明方法の具体的な施工手順の例について説明する。図１０〜図１２はその手順説明図であり、それぞれ管路の筒長方向に沿った模式的断面図を示している。
【００３５】
まず、図１０に示すように、マンホールＢ，Ｃ間が補修対象管路であるとすると、その上流側および下流側のマンホールＡおよびＤに近接してそれぞれ堰１０１および１０２を構築し、堰１０１によってせき止められた下水を、地上に設けたポンプ１０３および排水ホース１０４によって、堰１０２の下流側に排出することにより、水替えを行う。これにより、補修対象管路であるマンホールＢ，Ｃ間がドライの状態となる。
【００３６】
その状態で、マンホールＢから補修対象管路内へ、あらかじめ既設管Ｐの下半部に略沿うように成形された成形パネル１を順次引き込んで、既設管Ｐの下半部を覆うように各成形パネル１を組み立てながら設置する。この状態を図１１に示す。このとき、既設管Ｐの腐食等により、成形パネル１と既設管Ｐの下半部表面との間に隙間が生じる場合には、成形パネル１の設置後、その隙間にモルタル等の裏込め材を注入し、隙間を埋めることが好ましいことは前記の通りである。また、既設管Ｐの下半部表面と成形パネル１との間の隙間が大きい場合には、そこにリブ材３を介在させることも前記した通りである。なお、裏込め時に成形パネル１が浮力により浮き上がるのを防止するため、既設管Ｐ内に支保工を組み立てたり、成形パネル１上から地中にアンカーを打ち込むことで対応する。
【００３７】
リブ材３を介在させ、かつ、リブ材３をあらかじめ成形パネル１に対して一体化しているとともに、各リブ材３に緊締部材８を貫通させている場合には、各成形パネル１は緊締部材８によって管路筒長方向に一体的に連結されることになるから、その場合には、マンホールＣに引き取り機（図示せず）を配置して、緊締部材８を介して各成形パネル１を順次管路内に引き込むことができる。また、緊締部材８が管路全長にわたっている場合には、引き込み後、緊締部材８の両端部を締め上げることにより、各成形パネル１どうしを筒長方向により確実に一体化することができる。
【００３８】
成形パネル１の設置後、リブ材３の存在により既設管Ｐの下半部表面と成形パネル１との間に全面的に生じている隙間に裏込め材を注入してその隙間を埋め、成形パネルと既設管Ｐの下半部表面とを一体化させる。なお、図５および図６の例では、各リブ材３が周方向に沿っているが、この場合においては、成形パネル１の設置後、補修対象管路の両端部において成形パネル１と既設管Ｐの下半部表面との間に生じている隙間に蓋をし、成形パネル１の周方向両端部から裏込め材を注入すると、リブ材３に沿った形で裏込め材を注入することができ、効率的な注入を行うことができて好ましい。
【００３９】
ここで、リブ材３は管路筒長方向に沿ったものとしてもよく、この場合、成形パネル１の周方向両端部において隙間に蓋をし、成形パネルの筒長方向両端部から裏込め材を注入すれば、上記と同様にリブ材３に沿って裏込め材を注入することができて好ましい。
【００４０】
さて、以上のようにして成形パネル１の設置を完了すると、次いでシート状内張り材２による内張り作業を行う。この作業においては、設置が完了した成形パネル１の周方向両端部に重なり合うだけの幅寸法を有する、熱硬化性樹脂を含浸させて未硬化状態の柔軟なシート状内張り材２を、マンホールＢから補修対象管路内に引き込む。また、図１２に示すように、シート状内張り材２の引き込みと同時にその下方に引き込んだ、あるいはあらかじめ補修対象管路内に引き込んでおいた拡張チューブ１０５の両端に端末金具１０６ａ，１０６ｂを装着し、そのいずれかの金具に設けた流体圧入口からエアを圧入して拡張チューブ１０５を膨張させ、シート状内張り材２を拡張させて、その周方向両端部が成形パネル１の周方向両端部に重なり合った状態で、既設管Ｐの上半部表面に密着させる。その後、拡張チューブ１０５内に蒸気もしくは温水等の加熱流体を圧入し、熱硬化性樹脂を硬化させる。以上の作業により、図１ないしは図４に示した構造の管路が得られる。
【００４１】
なお、以上の手順例では、成形パネル１を先に設置した後、シート状内張り材２を設置した例を示したが、本発明においては、その設置の順序を逆にしてもよい。
【００４２】
また、以上の各施工例では、馬蹄形の既設管に対して本発明を適用した例を示したが、本発明はこれに限定されることなく、例えば図１３に示すような卵形管や、あるいは図１４に示すような矩形管（ボックスカルバート管）に対しても適用することができ、これらの場合においても、管路の下半部を成形パネル１、上半部をシート状内張り材２でそれぞれ覆っており、また、成形パネル１とシート状内張り材２はそれぞれの周方向両端部において互いに重ね合わせ部Ｌにおいて重なり合っている。これらの各管の施工に際しても、その手順については上記した例と同等とすればよい。
【００４３】
更に、本発明においては、成形パネル１およびシート状内張り材２自体の構造は、前記したものに限定されることはなく、所要強度と良好な施工性が得られるものであれば、任意の構造とすることができる。
【００４４】
【発明の効果】
本発明によれば、馬蹄形管をはじめとする異形管の内周面のうち、下半部につていは当該下半部の形状に略沿うような形状に既に成形されている成形パネルで覆うとともに、上半部については未硬化の樹脂を含浸させて柔軟なシート状内張り材を密着させた後に樹脂を硬化させて被覆するから、大口径の異形管であっても、従来のような周方向に一体的な内張り材を用いる場合に比して、個々の内張り材の寸法の増大および重量の増大を抑制することができ、マンホールからの搬入が可能であり、また、大型車を用いなくとも現場への搬入が可能となると同時に、管路の流下能力を左右する管路下半部に、馬蹄形管や矩形管のように角隅部が存在していても、その下半部は成形パネルによって覆われて皺が生じない。
【００４５】
また、成形パネルを周方向および／または筒長方向に適宜に分割したものを管路内で組み立てる請求項２に係る発明の採用によって、管路の口径に係わらず、広く本発明を適用することが可能となる。
【００４６】
また、成形パネルと管路下半部表面との間に生じた隙間に裏込め材を注入する請求項３に係る発明を採用すると、管路と成形パネルとを確実に一体化することができ、強度および水密性が向上する。
【００４７】
更に、成形パネルと管路下半部表面との間にリブ材を介在させて意図的に全面的な隙間を形成し、その隙間に裏込め材を注入する請求項４または５に係る発明の採用により、管路の不陸をある程度直線的に補正して管路と成形パネルを一体化することができる。この場合、リブ材をあらかじめ成形パネルに対して一体化する請求項４に係る発明によると、作業環境の悪い管路内での作業を少なくすることができ、また、リブ材を管路内に設置した後に成形パネルを設置して一体化する請求項５に係る発明によれば、複雑な管路表面形状への対応が容易となる。
【００４８】
更にまた、リブ材を緊締部材によって筒長方向に連結する請求項６に係る発明によれば、その緊締部材を介してリブ材並びにそれに一体化されている成形パネルを管路内に引き込むことが可能となって、その設置作業が容易となる。
【００４９】
また、この緊締部材によって各リブ材並びにそれに一体化されている成形パネルを管路筒長方向に緊締すると、各成形パネルは管路全長にわたって一体化され、強固な内張り材となる。
【図面の簡単な説明】
【図１】本発明方法を適用して内張りされた管路の構造例を示す模式的断面図である。
【図２】同じく本発明方法を適用して内張りされた管路の他の構造例を示す模式的断面図である。
【図３】同じく本発明方法を適用して内張りされた管路の更に他の構造例を示す模式的断面図である。
【図４】同じく本発明方法を適用して内張りされた管路の更にまた他の構造例を示す模式的断面図である。
【図５】図４のＡ−Ａ断面図である。
【図６】図４のＡ−Ａ面で切断した他の構造例の説明図である。
【図７】図４のＢ部拡大図である。
【図８】図５のＡ部拡大図である。
【図９】本発明を適用した各施工例に用いられる成形パネル１の構造例を示す模式的断面図である。
【図１０】本発明方法の具体的な施工手順の例の説明図で、補修対象管路の水替えをおなっている状態を示す管路筒長方向に沿った模式的断面図である。
【図１１】同じく本発明方法の具体的な施工手順の例の説明図で、既設管Ｐ内に成形パネル１を設置した状態を示す管路筒長方向に沿った模式的断面図である。
【図１２】同じく本発明方法の具体的な施工手順の例の説明図で、既設管Ｐ内にシート状内張り材２を設置して拡張チューブ１５によって拡張させた状態を示す管路筒長方向に沿った模式的断面図である。
【図１３】本発明方法を適用して内張りされた卵形管の構造例を示す模式的断面図である。
【図１４】本発明方法を適用して内張りされた矩形管の構造例を示す模式的断面図である。
【符号の説明】
１成形パネル
１ａ段部
１１シート状不織布
１２シート状織布
２シート状内張り材
３リブ材
３ａ貫通孔
４目止め材
５裏込め材
８緊締部材
１０１，１０２堰
１０３ポンプ
１０４排水ホース
１０５拡張チューブ
１０６ａ，１０６ｂ端末金具
Ｐ既設管
ＣＰ角隅部
Ｌ重ね合わせ部
Ａ，Ｂ，Ｃ，Ｄマンホール[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of lining a deformed pipe line such as a sewer pipe and having a circular cross-section, and is suitable for construction of a large-diameter deformed pipe line having a diameter of 800 mm or more that allows a person to work in the pipe line. Regarding the method.
[0002]
[Prior art]
As a method of repairing existing pipes such as underground pipes such as sewer pipes, an uncured flexible cylindrical or sheet lining material impregnated with a thermosetting resin has been used in the pipes. Install and expand the lining material by inflating the tube inserted inside the lining material, etc., and make it adhere to the inner peripheral surface of the pipeline, then cure the thermosetting resin, and in the existing pipeline Therefore, a pipe lining method called a so-called soft lining method for forming a new pipe is mainly employed.
[0003]
[Problems to be solved by the invention]
The soft lining method as described above is not applied to large-diameter pipes for the following reasons. First, the diameter of the lining material increases in accordance with the pipe diameter, and it becomes difficult to insert the lining material into the pipe through a manhole (600 mm diameter). Secondly, the increase in size makes it impossible to carry in the site without using a large transport vehicle, making it difficult to implement on narrow roads. For this reason, the soft lining method has a pipe diameter of practically applicable up to a diameter of about 1000 mm.
[0004]
By the way, the large-diameter pipes are not limited to pipes having shapes other than the circular pipes that are currently mainstream. For example, in large cities such as Tokyo and Osaka, sewer pipes have been buried since before the war, and the shape of the pipes is often deformed, such as a tunnel-shaped horseshoe or rectangle. As a feature of such an irregularly shaped pipe, the lower part of the pipe is flat, and the corners at both ends of the flat part are nearly perpendicular. Even if a soft lining method is applied to such a pipe and a flexible lining material is expanded in the pipe line, the lining material needs to have a certain thickness to be applied to a large-diameter pipe, even in an uncured state of the resin. Due to the high rigidity, depending on the internal pressure, it does not follow the corners of the above-mentioned corners well, so that wrinkles or gaps are often formed between the inner surface of the pipe. However, it is difficult to apply the soft lining method.
[0005]
An object of the present invention is to provide a pipe lining method that can accurately apply a lining to a deformed pipe having a large diameter without causing wrinkles or gaps.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the method of lining a pipe according to the present invention is a method of covering the inner peripheral surface of a pipe made of an existing pipe having a deformed cross-sectional shape, and comprising a lower part of the pipe On the other hand, a molded panel made of fiber reinforced resin formed into a shape corresponding to the shape of the lower part of the pipe is installed, while an uncured flexible sheet-like lining impregnated with a thermosetting resin is installed on the upper part of the pipe. The material is placed and brought into close contact, and then cured, and the sheet-like lining material and the molded panel are characterized by lining them so as to overlap each other at both circumferential ends (claim 1).
[0007]
In the present invention, it is possible to employ a method in which the molded panel is divided into a plurality in the cylinder length direction and / or the circumferential direction, and these are assembled in the pipeline and aligned along the lower surface of the pipeline. (Claim 2).
[0008]
Moreover, in this invention, the method of inject | pouring a backfilling material into the clearance gap produced between the shaping | molding panel and the pipe line lower surface can also be employ | adopted (Claim 3).
[0009]
Furthermore, in the present invention, a rib is formed in advance on the surface of the molded panel that faces the lower surface of the pipeline, thereby forming a gap between the molded panel installed at the lower portion of the pipeline and the lower surface of the pipeline. A backfill material may be injected into the gap (claim 4).
[0010]
Further, in the present invention, after a plurality of rib members are installed in advance in the lower part of the pipe line, a molded panel is installed on the rib member, and the rib member and the molded panel are integrated to generate the rib member. A backfilling material may be injected into the gap between the pipe lower surface and the molded panel.
[0011]
Further, when the invention according to claim 4 or 5 is adopted, a fastening member is passed through the rib member according to claim 4 or 5 in the tube tube length direction, and the plurality of rib members are connected to the tube tube length by the tightening member. It is possible to adopt a method in which the respective rib members or the respective molded panels integrated with the rib members are sequentially drawn into the pipe line through the tightening members.
[0012]
When the invention described in claim 4, 5, or 6 is adopted, each molded panel is piped by tightening a tightening member that is passed through each rib member after or during installation of the molded panel. A method of integrating in the length direction of the tube can be employed (claim 7).
[0013]
The present invention simultaneously eliminates the difficulty of application to a large-diameter pipe and the difficulty of adhesion of the deformed pipe to the pipe inner surface of the lining material, particularly to the corners, which are problems in the soft lining method.
[0014]
In other words, the lining material is divided into two in the circumferential direction so as to correspond to the upper and lower portions of the pipe, thereby avoiding an increase in the size and weight of the lining when the large-diameter pipe is lined, and the pipe line through the manhole. It is possible to pull in, and it is possible to eliminate the need to use a large vehicle for delivery to the site.
[0015]
In addition, a lined material made of a fiber-reinforced resin molded panel that has been pre-shaped along the shape is installed at the lower part of the pipe line where the corners of the deformed pipe are present. Does not occur. Here, in a pipe having a rectangular cross section (box culvert pipe), a corner portion is also present in the upper part of the pipe, and in the present invention, the upper part of the pipe is a flexible sheet-like lining material equivalent to the conventional soft lining method. In order to expand and harden, some wrinkles will occur at the corners of the upper part of the pipe, but the sewage and rainwater flowing in the pipe are usually up to about 2/3 the height of the pipe. It is a flow rate, and there is no particular problem with soot generated near the corner of the upper part of the pipe. In the case where a gap is formed between the upper corner of the rectangular tube and the inner surface of the tube, it is preferable to back-fill with mortar or the like.
[0016]
And about the molded panel installed in the lower part of the pipe line, as in the invention according to claim 2, if the pipe is divided into the cylinder length direction or the circumferential direction and is assembled in the pipe line, it is repaired. The present invention can be widely applied regardless of the diameter of the target pipeline.
[0017]
In addition, when the method of injecting the backfill material between the molded panel installed at the lower part of the pipe line and the surface of the lower part of the pipe line as in the invention according to claim 3, corrosion of the existing pipe inner surface is severe. In addition, the molded panel and the inner surface of the pipe line can be integrated, and the performance such as strength and water tightness is improved.
[0018]
The invention according to claims 4 and 5 is an effective method in the case where unevenness occurs due to a step or a bend on the pipe lower surface, and is a rib material integrated with the molded panel in advance? ), Or a rib material is preliminarily placed on the lower surface of the pipe and then a molding panel is placed on the pipe to integrate it (Claim 5), and intentionally between the pipe lower surface and the molding panel through the rib material. By injecting the backfilling material into the gap provided on the entire surface, the unevenness of the pipeline can be corrected to some extent linearly, and at the same time, the molded panel can be integrated with the lower surface of the pipeline.
[0019]
Here, as in the invention according to claim 4, when the rib material is integrated with the molded panel in advance, there is an advantage that the work in the pipeline having a poor working environment can be reduced. As in the invention according to 5, the method in which the molded panel is installed and integrated after the rib material is installed on the pipe lower surface has an advantage that it can cope with a complicated pipe inner surface shape. In this case, it does not prevent simultaneous use of repair work on the lower surface of the pipe line (such as leveling of a step or leveling work of a depressed portion) when the rib member is installed.
[0020]
Further, in the case of using the rib material as described above, as in the invention according to claim 6, each rib material is integrated by a fastening member such as a wire or a shaft along the pipe tube length direction, thereby The installation work in the pipe line of the material or the molded panel integrated therewith can be facilitated.
[0021]
Further, as in the invention according to claim 7, the fastening members connecting the rib members in the tube tube length direction are fastened in the middle of the installation of the molded panel or after the installation is completed, and are integrated into the rib material. When the molded panel is integrated in the tube cylinder length direction, a lining material firmly fixed in the tube tube length direction can be constructed.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 are schematic cross-sectional views showing the structure of a pipeline lined by applying the method of the present invention, and are views cut along a plane perpendicular to the tube length direction of the pipeline. In each of these examples, the present invention is applied to an existing pipe P having a horseshoe-shaped cross section, and in each example, the lower half of the existing pipe P has a shape of the lower half of the existing pipe P in advance. The upper half is covered with a sheet-like lining material 2 and the sheet-like lining material 2 is impregnated with a thermosetting resin. Is pulled into the existing pipe P and hardened after being brought into close contact with the upper half thereof.
[0023]
The molded panel 1 and the sheet-like lining material 2 overlap each other over a predetermined length at both ends in the circumferential direction. As a form of the overlapping portion L of the molded panel 1 and the sheet-like lining material 2, as shown in FIG. 1, both ends in the circumferential direction of the molded panel 1 as shown in FIG. A step 1a is formed on the surface of the sheet, and both ends of the sheet-like lining material 2 are accommodated in the step 1a, or as shown in FIG. The structure etc. which made the circumferential direction both ends of the shape lining material 2 reach the corner | angular corner CP of the lower surface of the existing horseshoe-shaped pipe P are employable.
[0024]
In addition, when corrosion of the existing pipe P proceeds and the molded panel 1 cannot be installed along the lower half of the pipe, the surface of the lower half of the molded panel 1 and the existing pipe P as shown in FIG. It is desirable to employ a structure in which the rib material 3 is disposed between the two and a backfill material is injected into the gap formed thereby.
[0025]
The molded panel 1 in each of the above examples is obtained by assembling and integrating the appropriate divisions of the existing pipe P in the cylinder length direction and the circumferential direction. Therefore, if it shows in the AA sectional drawing, it will divide only in the cylinder length direction of the existing pipe P as schematically shown in FIG. 5, or in the cylinder length direction and the circumferential direction as schematically shown in FIG. It is possible to adopt a form that is divided and arranged so that the divided surfaces in the cylinder length direction are alternately positioned.
[0026]
When each molded panel 1 is installed, as shown in FIG. 7 in the BB enlarged view in FIG. 4 and in FIG. 8 in the A section enlarged view in FIG. 5, adjacent ones overlap each other. It is preferable to form a stepped portion 1a at the end portion, and the overlapped portion is treated with a sealant material 4 such as a water-swellable sealant material or an epoxy resin to provide watertightness and chemical resistance. It is desirable to improve. In FIGS. 7 and 8, 5 is a backfilling material.
[0027]
Moreover, when the clearance gap between the shaping | molding panel 1 and the lower half part surface of the existing pipe P is large, it is desirable to install the rib material 3 as shown in FIG. A steel material can be suitably used. Further, it is preferable to form through holes 3a as shown in FIG. 7 at appropriate intervals in the rib material 3 because integration with the backfill material 5 increases due to the anchor effect. The rib member 3 may have a structure in which ribs protrude from a general plastic plate.
[0028]
The rib material 3 may be integrated with the molded panel 1 in a factory or the like in advance, or the rib material 3 may be installed on the lower half surface of the existing pipe P and then the molded panel 1 may be installed and integrated. Good. Normally, it is preferable for the work to integrate the rib material 3 into the molded panel 1 in advance, but it is more efficient to work on site when the inner surface of the pipe line is severely corroded, meandering or bent. In some cases, it is sufficient to investigate the pipeline condition in advance and select which method to use as appropriate.
[0029]
Further, as a method of integrating the rib member 3 and the molded panel 1, a method of fixing with a bolt 6 and a nut 7 as shown in FIG. 8 (the nut 7 may not be used), an adhesion method, Alternatively, they may be structurally fitted to each other.
[0030]
When the rib material 3 is used, as shown in FIG. 5, the fastening member 8 such as a wire is penetrated in the pipe tube length direction every several through holes 3 a formed in the rib material 3, and each rib material 3 and The molded panel 1 integrated therewith can be connected in the cylinder length direction. As the tightening member 8, a shaft can be adopted in addition to a wire, and when a step or bend is generated in the existing pipe P, it is preferable to use a flexible wire. It is also possible to use a tightening member that passes through the entire length of the pipe to be repaired as a wire and a tightening member that is passed through to unite several molded panels 1 as a shaft. In addition, since the tightening member plays a role of tightening each rib member 3 and each molded panel 1 integrated therewith in the tube length direction of the pipe line, at least one or several tightening members are used. It is preferable to have a length over the entire length of the pipe to be repaired.
[0031]
In addition, in the example shown in FIG. 6, after forming the rib material 3 in the existing pipe P, the molding panel 1 is installed and integrated, but also in this case, each rib material 3 is penetrated in the pipe tube length direction. You may connect with the tightening member.
[0032]
In each of the above construction examples, the molded panel 1 is a molded body of fiber reinforced resin, and the structure thereof is a sheet-like nonwoven fabric 11 such as polyester fiber or polyolefin fiber as shown in a schematic sectional view in FIG. A sheet-shaped woven fabric 12 such as a glass roving cloth is arranged on both the front and back surfaces of the material, and the whole is impregnated with a thermosetting resin such as an unsaturated polyester resin and cured in a mold. can do.
[0033]
As for the sheet-like lining material 2, one having the same structure as that of the molded panel 1 can be adopted, and an unsaturated polyester resin or the like is used in which a sheet-like woven fabric such as a glass roving cloth is arranged on both front and back sides of the sheet-like nonwoven fabric The resin is drawn into the existing pipe P in a soft and uncured state, and is expanded using an expansion tube or the like as will be described later to adhere to the upper half of the existing pipe P. It is heat-cured in the state.
[0034]
Next, the example of the concrete construction procedure of the method of this invention for obtaining the structure of each above construction example is demonstrated. FIG. 10 to FIG. 12 are explanatory diagrams of the procedure, and each show a schematic cross-sectional view along the tube length direction of the pipeline.
[0035]
First, as shown in FIG. 10, assuming that the space between manholes B and C is a pipe to be repaired, weirs 101 and 102 are constructed in close proximity to the upstream and downstream manholes A and D, respectively. The sewage blocked by the water is discharged to the downstream side of the weir 102 by the pump 103 and the drainage hose 104 provided on the ground, so that the water is changed. As a result, the space between the manholes B and C, which are the pipes to be repaired, is in a dry state.
[0036]
In that state, the molded panels 1 that have been molded in advance so as to substantially follow the lower half of the existing pipe P are sequentially drawn from the manhole B into the pipe to be repaired, so that the lower half of the existing pipe P is covered. The molded panel 1 is installed while being assembled. This state is shown in FIG. At this time, if a gap is generated between the molded panel 1 and the lower half surface of the existing pipe P due to corrosion of the existing pipe P, a backfilling material such as mortar is placed in the gap after the molding panel 1 is installed. As described above, it is preferable to fill the gap. Moreover, when the clearance gap between the lower half surface of the existing pipe P and the shaping | molding panel 1 is large, as above-mentioned, the rib material 3 is interposed there. In order to prevent the molded panel 1 from being lifted by buoyancy during backfilling, it is possible to assemble a support in the existing pipe P or to drive an anchor into the ground from the molded panel 1.
[0037]
When the rib material 3 is interposed and the rib material 3 is integrated with the molded panel 1 in advance, and the fastening members 8 are passed through the rib materials 3, each molded panel 1 is a fastening member. In this case, a take-up machine (not shown) is disposed in the manhole C, and each molded panel 1 is connected via the tightening member 8. It can be sequentially drawn into the pipeline. Further, when the tightening member 8 extends over the entire length of the pipe line, by tightening both ends of the tightening member 8 after drawing, the molded panels 1 can be reliably integrated in the tube length direction.
[0038]
After the molding panel 1 is installed, a backfilling material is injected into the gap formed entirely between the lower half surface of the existing pipe P and the molding panel 1 due to the presence of the rib material 3 to fill the gap. The panel and the lower half surface of the existing pipe P are integrated. 5 and 6, each rib member 3 is along the circumferential direction. In this case, after the molding panel 1 is installed, the molding panel 1 and the existing pipe are installed at both ends of the pipe to be repaired. Cover the gap formed between the lower half surface of P and inject the backfill material from both ends of the molded panel 1 in the circumferential direction, then inject the backfill material along the rib material 3 This is preferable because efficient injection can be performed.
[0039]
Here, the rib material 3 may be along the tube cylinder length direction, and in this case, the gap is covered at both ends in the circumferential direction of the molded panel 1 and the backfill material is formed from both ends in the tube length direction of the molded panel. It is preferable that the backfilling material can be injected along the rib material 3 in the same manner as described above.
[0040]
Now, when the installation of the molded panel 1 is completed as described above, the lining work by the sheet-like lining material 2 is then performed. In this operation, a flexible sheet-like lining material 2 impregnated with a thermosetting resin and having a width dimension that overlaps both ends in the circumferential direction of the molded panel 1 that has been installed is removed from the manhole B. Pull into the repair target pipeline. Also, as shown in FIG. 12, terminal fittings 106a and 106b are attached to both ends of the expansion tube 105 that has been drawn downward simultaneously with the drawing of the sheet-like lining material 2 or that has been drawn into the pipe to be repaired in advance. The expansion tube 105 is expanded by injecting air from a fluid pressure inlet provided in any one of the metal fittings, and the sheet-like lining material 2 is expanded, so that both ends in the circumferential direction are at both ends in the circumferential direction of the molded panel 1. In an overlapped state, it is brought into close contact with the upper half surface of the existing pipe P. Thereafter, a heating fluid such as steam or warm water is pressed into the expansion tube 105 to cure the thermosetting resin. Through the above operation, the conduit having the structure shown in FIGS. 1 to 4 is obtained.
[0041]
In the above procedure example, the example in which the sheet-like lining material 2 is installed after the molded panel 1 is installed first is shown. However, in the present invention, the order of installation may be reversed.
[0042]
Further, in each of the above construction examples, the example in which the present invention is applied to the horseshoe-shaped existing pipe is shown, but the present invention is not limited to this, for example, an oval pipe as shown in FIG. Alternatively, the present invention can also be applied to a rectangular tube (box culvert tube) as shown in FIG. 14, and in these cases, the lower half of the pipe is the molded panel 1 and the upper half is the sheet-like lining material 2. In addition, the molded panel 1 and the sheet-like lining material 2 are overlapped with each other in the overlapping portion L at both circumferential ends. Also in the construction of each of these pipes, the procedure may be equivalent to the above example.
[0043]
Furthermore, in the present invention, the structures of the molded panel 1 and the sheet-like lining material 2 themselves are not limited to those described above, and any structure can be used as long as required strength and good workability can be obtained. It can be.
[0044]
【The invention's effect】
According to the present invention, among the inner peripheral surfaces of deformed pipes such as horseshoe-shaped pipes, the lower half is covered with a molded panel that has already been formed into a shape substantially conforming to the shape of the lower half. At the same time, since the upper half is impregnated with uncured resin and the flexible sheet-like lining material is adhered, the resin is cured and coated. Compared to the case of using a lining material integrated in the direction, it is possible to suppress an increase in the size and weight of each lining material, and it is possible to carry in from a manhole, and without using a large vehicle. Both can be brought into the field, and at the same time, even if there are corners in the lower half of the pipeline that affect the flow capacity of the pipeline, such as horseshoe-shaped and rectangular tubes, the lower half is molded. It is covered with panels and does not cause wrinkles.
[0045]
In addition, by adopting the invention according to claim 2 in which the molded panel is appropriately divided in the circumferential direction and / or the cylinder length direction and assembled in the pipeline, the present invention is widely applied regardless of the diameter of the pipeline. Is possible.
[0046]
Further, when the invention according to claim 3 in which the backfilling material is injected into the gap formed between the molded panel and the lower half surface of the pipeline, the pipeline and the molded panel can be reliably integrated. Strength and water tightness are improved.
[0047]
The invention according to claim 4 or 5, wherein a rib material is interposed between the molded panel and the surface of the lower half of the pipe to intentionally form a full gap, and a backfill material is injected into the gap. By adopting it, the pipe line and the molded panel can be integrated by correcting the unevenness of the pipe line linearly to some extent. In this case, according to the invention according to claim 4 in which the rib material is integrated with the molded panel in advance, it is possible to reduce the work in the pipeline having a poor working environment, and the rib material is placed in the pipeline. According to the invention according to claim 5 in which the molded panel is installed and integrated after installation, it becomes easy to cope with a complicated pipe surface shape.
[0048]
Furthermore, according to the invention according to claim 6 in which the rib member is connected in the cylinder length direction by the tightening member, the rib member and the molded panel integrated therewith can be drawn into the pipe line through the tightening member. It becomes possible and the installation work becomes easy.
[0049]
Further, when the rib members and the molded panel integrated therewith are tightened in the tube tube length direction by the tightening member, the molded panels are integrated over the entire length of the channel and become a strong lining material.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a structural example of a pipeline lined by applying the method of the present invention.
FIG. 2 is a schematic cross-sectional view showing another structural example of a pipeline lined by applying the method of the present invention.
FIG. 3 is a schematic cross-sectional view showing still another structural example of a pipeline lined by applying the method of the present invention.
FIG. 4 is a schematic cross-sectional view showing still another example of the structure of a pipeline lined by applying the method of the present invention.
5 is a cross-sectional view taken along the line AA in FIG.
6 is an explanatory diagram of another structural example cut along the AA plane in FIG. 4; FIG.
7 is an enlarged view of a portion B in FIG.
8 is an enlarged view of a part A in FIG.
FIG. 9 is a schematic cross-sectional view showing a structural example of a molded panel 1 used in each construction example to which the present invention is applied.
FIG. 10 is an explanatory diagram of an example of a specific construction procedure of the method of the present invention, and is a schematic cross-sectional view along the pipe tube length direction showing a state in which the water to be repaired is changed.
11 is an explanatory view of an example of a specific construction procedure of the method of the present invention, and is a schematic cross-sectional view along the pipe tube length direction showing a state in which the molded panel 1 is installed in the existing pipe P. FIG.
12 is an explanatory view of an example of a specific construction procedure of the method of the present invention, and shows a state in which the sheet-like lining material 2 is installed in the existing pipe P and is expanded by the expansion tube 15 in the pipe tube length direction. It is typical sectional drawing in alignment with.
FIG. 13 is a schematic cross-sectional view showing a structural example of an oval tube lined by applying the method of the present invention.
FIG. 14 is a schematic cross-sectional view showing a structural example of a rectangular tube lined by applying the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molding panel 1a Step part 11 Sheet-like nonwoven fabric 12 Sheet-like woven fabric 2 Sheet-like lining material 3 Rib material 3a Through-hole 4 Sealing material 5 Backing material 8 Tightening members 101, 102 Weir 103 Pump 104 Drain hose 105 Expansion tube 106a 106b Terminal fitting P Existing pipe CP Corner corner L Overlapping part A, B, C, D Manhole

Claims

A method of covering an inner peripheral surface of a pipe formed of an existing pipe having an irregular cross-sectional shape,
A molded panel made of fiber reinforced resin formed in a shape corresponding to the shape of the lower part of the pipe line is installed at the lower part of the pipe line, while an uncured soft resin impregnated with a thermosetting resin is installed at the upper part of the pipe line. A sheet-like lining material is placed and brought into intimate contact, and then cured, and the sheet-like lining material and the molded panel are lined so as to overlap each other at both circumferential ends. The lining method.

2. The pipe lining according to claim 1, wherein the molded panel is divided into a plurality of parts divided in the cylinder length direction and / or the circumferential direction, and is assembled in the pipe line so as to be along the pipe lower surface. Method.

The method of lining a pipe according to claim 1 or 2, wherein a backfilling material is injected into a gap formed between the molded panel and the lower surface of the pipe.

By integrating the rib material in advance with the surface facing the pipe lower surface of the above molded panel, a gap is formed between the molded panel installed at the lower part of the pipe and the lower surface of the pipe, and the gap is backed up. The pipe lining method according to claim 1, 2, or 3, wherein a material is injected.

After installing a plurality of rib members in advance in the lower part of the pipeline, the molded panel is installed on the rib members to integrate the rib member and the molded panel. The method of lining a pipe according to claim 1, 2 or 3, wherein a backfilling material is injected into a gap between the two.

A pipeline process of the lining according to claim 4 or 5, claim 4 or 5 Contact the kicking is passed through the clamping member to the conduit tube length direction rib material, a plurality of ribs material by its frettage fastening member The pipe lining is characterized in that each of the rib members or the molded panels integrated with the rib members are sequentially drawn into the pipe line through the tightening member. Method.

7. The pipe lining method according to claim 6 , wherein each molded panel is tightened in the tube tube length direction by tightening the tightening member penetrating each rib member during or after installation of the molded panel. A lining method for a pipe line, characterized by being integrated into a pipe.