JP4301420B2 - Pipe repair method - Google Patents

Pipe repair method Download PDF

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Publication number
JP4301420B2
JP4301420B2 JP25450599A JP25450599A JP4301420B2 JP 4301420 B2 JP4301420 B2 JP 4301420B2 JP 25450599 A JP25450599 A JP 25450599A JP 25450599 A JP25450599 A JP 25450599A JP 4301420 B2 JP4301420 B2 JP 4301420B2
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Japan
Prior art keywords
pipe
resin plate
repair
reinforcing
integrated
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JP25450599A
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Japanese (ja)
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JP2001082675A (en
Inventor
雅敏 石川
斉藤  均
太司 槇本
克彦 東
真史 堅田
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Ashimori Industry Co Ltd
Ashimori Engineering Co Ltd
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Ashimori Industry Co Ltd
Ashimori Engineering Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、下水道管路等の既設管路の補修方法に関し、特に、人が管路内に入って作業可能な口径800mm以上の大口径管路を補修するのに適した管路の補修方法に関する。
【0002】
【従来の技術】
例えば下水道の大口径管を開削することなく補修する方法として、従来、片面にリブが形成された塩化ビニル製の帯状プロファイルを既設管内で螺旋状に巻回して製管するとともに、その内側から支保材を組んだ状態で、既設管とプロファイルとの間に裏込め材を注入する方法や、同じく塩化ビニル製のやや幅広の帯状(ストリップ)材を管内で螺旋状に巻回して既設管内面に沿わせるとともに、既設管の内面との間に裏込め材を注入する際の注入圧を低く抑えるために、帯状材を巻回する前に、既設管内面の上部に裏込め材注入用ホースを通すスペースを形成するためのスペーサを取り付ける方法、あるいは、スタッドのついたポリエチレンチューブを既設管内に引込み、裏込め材の注入時にチューブ内に水圧をかけることによって、そのチューブの変形を防止する方法等が知られている。
【0003】
【発明が解決しようとする課題】
ところで、以上のような従来の管路の補修方法においては、裏込め材の注入時に支保材を組んだり、水圧をかけたり、あるいは前もって裏込め材注入用ホースを通すためのスペーサを設けるなど、多大な労力と時間を要し、その費用も膨大なものとなってしまう。
【0004】
また、以上の従来の管路の補修方法では、いずれも、補修部材自体の強度が低く、裏込め材との一体化によって必要強度を得るような構造となっているため、帯状プロファイル等の補修部材の裏込め材に接する側の面にリブを密に配する必要があり、その多数のリブの存在によって裏込め材が十分に行き渡らないという問題がある。ここで、その問題を解決するために、および、裏込め材の注入圧を低減させるために、裏込め材に流動化材が添加されるのであるが、その分のコストが上昇するという問題がある。更に、必要強度を裏込め材側に頼っているが故に、裏込め材に相応の強度が要求される結果、その価格が高価なものとなるという欠点もある。更にまた、補修部材自体の強度が低いために、既設管の痛みがひどくその強度が著しく低下している場合の補修に供するには不適当である。
【0005】
本発明はこのような従来の管路の補修方法における諸問題点を一挙に解決すべくなされたもので、裏込め材の注入時に支保を組んだり水圧をかける等の耐圧対策を必要とすることなく、また、流動化材等を添加することなく裏込め材を既設管と補修部材との間に十分に行き渡らせることが可能で、更に、裏込め材の強度を従来に比して低くして安価な裏込め材を用いても、腐食等による痛みの激しい既設管に適用して補修後の管路の強度を十分に高くすることのできる管路の補修方法の提供を目的としている。
【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、請求項1に係る発明の発明の管路の補修方法は、マンホールからの搬入が可能な樹脂板を、マンホールまたは既設管内で当該既設管の内周面に略沿うように筒状に形成するとともに、上記マンホールから搬入した高剛性材料からなる複数の補強部材を、上記筒状に形成した樹脂板の外周に対して一体化させつつその外周に沿ったリング状に組み立てることにより、樹脂製の表面材とその外周に一体化された補強リングを有してなる筒状の補修部材を順次組み立てつつ、所要長さが得られるように各補修部材を互いに軸方向に接合し、接合後の補修部材の外面と既設管の内面との間に裏込め材を注入する方法であって、上記樹脂板の既設管内面に向く面に、軸方向に沿って伸びる複数のパイプ状部材が一体化され、その各パイプ状部材に挿入されるシャフトを介して、上記補強部材が樹脂板に一体化されることによって特徴づけられる。
【0007】
ここで、請求項1に係る発明の管路の補修方法においては、上記樹脂板が、所定長さの筒体を周方向に複数に分割した形状を有したものとする構成を採用することができる。
【0008】
また、請求項1に係る発明において、上記補強部材に、補修部材の筒長方向に貫通する貫通孔が形成されているとともに、その貫通孔と上記樹脂板に一体化されたパイプ状部材に共通のシャフトが挿入されて当該シャフトの両端をナットで締結することにより、上記補強部材が樹脂板に一体化される構成(請求項3)を採用することができる。
【0009】
本発明は、補修部材自体に十分な強度を持たせることによって、裏込め材の注入時における圧力による補修部材の変形を防止すべく支保を組んだり水圧をかけることを不要とするとともに、腐食等の痛みの激しい既設管に対しても十分な強度を付与することを可能とし、しかも、裏込め材との一体化による強度を得るべく多数のリブを密に配することが不要となることから、流動化材を添加することなく補修部材と既設管の間での裏込め材の流動を容易化させようとするものである。
【0010】
すなわち、本発明においては、既設管の内周面に沿って配置される補修部材として、表面材としての樹脂板と、その樹脂板の外周側、つまり既設管内面側に向く面に一体化される高剛性材料からなる補強部材によって構成されたものが用いられ、樹脂板および補強部材はマンホールから搬入可能な形状・寸法とされる。そして、補強部材は、筒状に形成された樹脂板の周囲に沿ったリング状に組み立てられて補強リングとされるため、補修部材自体の強度が従来に比して大幅に向上し、補修部材自体の強度によって裏込め材の注入時における圧力に対して十分に耐えて有害な変形を生じることがなく、かつ、補修後には外水圧または土圧に抗する役割を担う。従って、裏込め材の強度を特に高くすることなく、腐食等の激しい既設管に用いても十分な強度を与えることができる。また、補修部材自体の強度を高くすることにより、裏込め材に対して一体化すべく補修部材の裏込め材との接触面に必要以上のリブを設けることが不要となり、裏込め材の注入時にその流動を妨げることがない。
【0011】
また、本発明方法においては、以上のような高強度の補修部材は、樹脂板と補強部材とに適宜に分割してマンホールから搬入し、マンホールまたは既設管内において筒状に組み立てられるため、開削を行うことなく大口径管路の更生が可能となる。
【0012】
【発明の実施の形態】
以下、図面を参照しつつ本発明の好適な実施の形態について述べる。なお、以上の実施の形態においては、補修対象管が円形断面の場合について述べる。図1は本発明を適用した管路の補修方法に用いられる補修部材の複数ユニットを互いに軸方向に接合した状態を示す部分断面正面図であり、図2はその左側面図である。
【0013】
この例における補修部材の1ユニット、つまり補修部材ユニット1は、全体として長さLの円筒形をなすものであって、長さLの円筒を周方向に3等分した形状を有する3個の樹脂板11と、その3個の樹脂板11を円筒状に組み合わせた状態で、その周囲に沿って配置される複数の補強リング12a,12bを主体として構成されており、各補強リング12a,12bは、それぞれ後述する3個の円弧状の補強部材121a,121bをリング状に組み立てたものである。
【0014】
樹脂板11は例えば高密度ポリエチレン製であり、図3に展開状態における要部の正面図(表面図)を示し、図4および図5にはそのA−A断面図および平面図を示すように、平板状材料を断面円弧状に賦形した本体部11aの片面に、軸方向(母線方向)に沿って伸びる複数のパイプ状部材11bとT形のリブ11cが周方向(円弧方向)に一定の間隔を開けて一体化されているとともに、母線方向両端部の対向2辺に規則的な切欠きを有する軸方向接続用フランジ部11dが形成され、他の対向2辺には周方向接続用フランジ部11eが形成されている。なお、図1においては、図面の煩雑化を避けるためにリブ11cについてはその図示を省略している。
【0015】
補強リング12a,12bを構成する補強部材121aおよび121bは、鋼材を用いた高剛性部材であり、互いに略同等の円弧形状をしており、図6に補強部材121aを代表させてその正面図を示すように、その厚さ(図6における紙面に直交する方向への寸法)は一様であって、円弧に沿って複数の貫通孔120が形成されている。補強リング12aおよび12bは、1個の補強部材ユニット1に対してそれぞれ4個ずつ用いられ、中央に4個の補強リング12aが、両端部にそれぞれ2個ずつの補強リング12bが用いられる。
【0016】
各補強リング12a,12bと樹脂板11との接合一体化は、図7に樹脂板11のパイプ状部材11bの軸方向に沿った断面図を示すように、補強リング12aについては、樹脂板11に形成されているパイプ状部材11bのうち、一直線上に並ぶ3個のパイプ状部材11bの間の2箇所と、それらの両端部の2箇所にそれぞれ配置した状態で、各パイプ状部材11bおよび各補強リング12aの貫通孔120をともに貫通するように、両端に雄ねじが形成されたシャフト13aを挿入し、その各雄ねじ13aにナット14aを締結することによって行われている。一方、補強リング12bについては、各補強部材ユニット1の両端のそれぞれにおいて、各軸方向接続用フランジ部11dの内側端面に沿って1個と、それよりも若干内側によった位置に1個が配置される。そして、これらの補強リング12bは、隣り合う補修部材1ユニット1の各端部に2個ずつ配置されたものについて、軸方向接続用フランジ部11dを挟んでそれぞれの貫通孔120に共通のシャフト13bを挿入してその両端部に形成されている雄ねじにナット14bを締結することによって、樹脂板11に対して一体化され、また、このシャフト13bおよびナット14bによって、隣り合う補修部材ユニット1どうしが軸方向に接合一体化される。なお、図7においてSはスペーサであり、Rは軸方向フランジ部11d間に形成された空隙に埋設した止水パッキンである。
【0017】
3個の樹脂板11および複数の補強部材121a,121bを周方向に互いに一体化するための構造は、図8に周方向接合部における断面図を示すように、各各樹脂板11の周方向接続用フランジ部11eを突き合わせた状態で、その両側に、軸方向に伸び、かつ、その方向に複数の貫通孔150が形成された周方向接続用金具15を配し、その各周方向接続用金具15の貫通孔150のそれぞれにボルト16を貫通させ、ナット17を締結することによって行われる。この周方向接続用金具15は、補強部材121aの両端部の内側に形成されている切欠き部U(図6参照)に嵌まり込んだ状態で補修部材ユニット1に固定される。また、周方向に隣り合う補強部材121aどうし、および121bどうしは、図1に示すように、各補強部材121a,121bの突き合わせ部分に補強部材接続用金具18を当てがって、その金具18の両側において補強部材121aまたは121bに対してボルト締めすることにより、相互に強固に一体化され、補強リング12aまたは12bとされる。なお、Rは周方向フランジ部11e間に形成された空隙に埋設した止水パッキンである。また、図1においては、図面の煩雑化を避けるために周方向接続用金具15およびボルト16等については図示を省略している。
【0018】
さて、以上の補修部材ユニット1を構成する部品である樹脂板11および補強部材121a,121b等は、例えば補修対象管路が1号人孔(マンホール)を有するものである場合には、そのストレート部の直径900mmを通過する大きさとされ、搬入に当たってはマンホールの蓋の部分のみを拡開する。そして、これらの各部品はマンホールに搬入された上で、そのマンホールおよびそれに通じる既設管内において長さLの円筒形の補修部材ユニット1に組み立てられ、更にその補修部材ユニット1を軸方向に接合して図1の状態とされる。また、この実施の形態においては、補修部材ユニット1の組立並びに軸方向への接合作業は、既設管内に下水隔離装置が挿入されて下水の流れない領域が形成され、その下水隔離領域において行われる。以下、その具体的な手法について述べる。
【0019】
図9は、既設管P内に下水隔離装置2を挿入し、その周囲に形成される下水隔離領域で樹脂板11や補強部材121a,121b等の部品を用いて円筒形の補修部材ユニット1を組み立てていく状態を示す模式的断面図であり、図10はそのA−A断面図である。
【0020】
下水隔離装置2は、筒状本体21aにアウターシール21bとインナーシール21cが設けられた止水プラグ21と、その止水プラグ21の筒状本体21aの下流側端面部に取り付けられる下水隔離用筒体22とを主体として構成されている。
【0021】
アウターシール21bおよびインナーシール21cは、それぞれ外部からエアを供給することによって膨張するシールであって、アウターシール21bは筒状本体21aの外周に沿って設けられた複数のドーナツ状ホース等によって構成され、エアを供給して膨張させることによって、既設管Pの内面に対して水密に当接する。また、インナーシール21cは筒状本体21aの内面に周囲が気密に固定された袋状体であり、エアを供給して膨張させることによって、筒状本体21aの内側空間を水密に封止することができる。
【0022】
下水隔離用筒体22は、既設管P内において止水プラグ21に対して取り付けられる。その取付け作業は、止水プラグ21のアウターシール21bおよびインナーシール21cにエアを供給して既設管P内の下水の流れを一時的に止めた状態で行われ、その作業において下水に触れることがない。下水隔離用筒体22を取り付けた後、インナーシール21c内のエアが排出される。これにより、既設管P内を流れてきた下水は、止水プラグ21の筒状本体21aおよび下水隔離用筒体22の内部を流れ、下水隔離用筒体22の周囲には下水が流れない領域、つまり下水隔離領域が形成される。
【0023】
以上のような下水隔離装置2を、図9に示すように、止水プラグ21が既設管P内に補修対象管路の上流側に位置するマンホールHに近接してその上流側に位置するように固定し、下水隔離用筒体22がマンホールHのインバート部に位置するように装着した状態で、前記した補修部材ユニット1を構成する樹脂板11および補強部材121a,121b等をマンホールH内に順次搬入して、3つの樹脂板11を円筒形に組み立てつつ、その周囲の規定位置に補強部材121a,121bを沿わせてリング状に組み立て、かつ、シャフト13a,ナット14a等により、円筒形に組み立てられた樹脂板11に対して一体化し、周囲に複数の補強リング12a,12bを有してなる円筒状の補強部材ユニット1を完成させる。1つの補修部材ユニット1を完成させると、その補修部材ユニット1を既設管Pの下流側に移動させ、上記と同様の手順により次の補修部材1を組み立て、先に組み立てた補修部材ユニット1に対して軸方向に接合していく。なお、補修部材ユニット1を組み立てた後に下流側に移動させる場合、図9に示すように下流側からワイヤ3で引っ張るとよい。
【0024】
以上の作業により、補修対象管路長に等しい長さの補修部材ユニット1の接合体が得られたら、例えばその両端部に妻型枠を装着し、各補修部材ユニット1の外周面と既設管Pの内周面との間にモルタル等の裏込め材を注入して、作業を終える。
【0025】
以上の方法において特に注目すべき点は、マンホールHおよびそれに通ずる既設管P内で円筒形に組み立てられた各補修部材ユニット1は、その外周に沿って鋼材等の高剛性材料からなる複数の補強リング12a,12bが一体化された構造を有しているため、それ自体の強度が高く、裏込め材の注入圧に対して十分に耐えることができる点であり、これにより、支保を組んだり内側から水圧をかけるといった裏込め材注入圧に対する耐圧のための工法が不要となる。また、補修部材ユニット1自体の強度が高いが故に、腐食等によって既設管Pの強度が弱くなっていても、補修により十分な強度を付与することが可能となるとともに、裏込め材として高強度のものを用いる必要もなくなり、更には、裏込め材との一体化を図るために補修部材に設けるリブの数は従来のものに比して少なくすることができる結果、裏込め材に流動化材を添加することなく、補修部材と既設管Pの間に裏込め材を十分に行き渡らせることが可能となる。
【0026】
また、以上の実施の形態のように下水隔離装置2を用いた工法を採用すると、補修部材ユニット1の組み立て並びに軸方向への接合のための作業は下水隔離領域で行うことが可能となり、しかも、その組み立て作業を通じて下水の流れを止める必要がないため、流量の多い下水道や流れの速い下水道に対しても、危険を伴うことなく作業を行うことができる。
【0027】
本発明は、補強リングの分割数等については、上記した実施の形態に限定されることなく、また、以上の実施の形態においては、既設管が円形断面であるものについて述べたが、例えば矩形渠(ボックスカルバート)や馬蹄形渠(アーチカルバート)に対しても本発明を等しく適用することができ、その場合、補修部材ユニット1,30は組立によりその管渠の断面形状に応じた形状となるように形成すればよく、また、下水隔離装置2を用いる場合においても、対象とする管渠の断面形状に応じた断面形状のものを用いればよい
【0028】
【発明の効果】
以上のように、本発明によれば、既設管内でその内面に略沿った補修部材を配置し、その補修部材と既設管の間に裏込め材を注入する管路の補修方法において、既設管内に補修部材を配置するに当たり、マンホールから搬入した樹脂板を、マンホールおよびそれに通ずる既設管内で筒状に形成して既設管内面に略沿わせ、同じくマンホールから搬入した高剛性材料からなる複数の補強部材を筒状に形成した樹脂板の周囲に対して一体化させながらその外周に沿ったリング状に組み立てることによって、樹脂製の表面材とその外周に一体化された補強リングを有する筒状の補修部材を順次組み立て、所要長さが得られるように複数の補修部材を互いに軸方向に接合していくため、従来の管路の補修方法に比して補修部材自体の強度が大幅に高く、それ自体で裏込め材の注入圧に十分に耐えるため、従来の工法のように支保を組んだり、あるいは内側から水圧をかける等の耐圧のための工事が不要となり、工費を大幅に削減することができる。
【0041】
また、補修部材の高強度化により、腐食等により強度が著しく低下している既設管の補修に適用しても、特に高強度の裏込め材等を用いることなく十分な強度を付与することができるとともに、従来のように裏込め材との一体化によって強度を得るべく多数のリブを密に配する必要がないため、流動化材を添加した裏込め材を用いることなく、裏込め材の充填度を高くすることができ、裏込め材として安価な材料を選択することができる。
【図面の簡単な説明】
【図1】 本発明を適用した管路の補修方法に用いられる補修部材ユニット1の複数個を軸方向に接合した状態を示す部分断面正面図である。
【図2】 図1の左側面図である。
【図3】 図1の補修部材ユニット1に用いられている樹脂板11の展開状態における要部の正面図(表面図)である。
【図4】 図3の平面図である。
【図5】 図3の右側面図である。
【図6】 図1の補修部材ユニット1に用いられている補強部材121aの正面図である。
【図7】 各補強部材121a,121bと樹脂板11との接合一体化の説明図で、樹脂板11のパイプ状部材11bの軸方向に沿って切断した要部断面図である。
【図8】 各樹脂板11および補強部材121a,121bを周方向に互いに一体化するための構造の説明図で、その周方向接合部における断面図である。
【図9】 本発明を適用した管路の補修方法において、既設管P内に下水隔離装置2を挿入した状態を示す模式的断面図である。
【図10】 図9のA−A断面図である。
【符号の説明】
1,30 補修部材ユニット
11,31 樹脂板
11a 平板状の本体部
11b パイプ状部材
11c T形のリブ
11d 軸方向接続用フランジ部
11e 周方向接続用フランジ部
12a,12b 補強リング
120 貫通孔
121a,121b 補強部材
13a,13b シャフト
14a,14b,17 ナット
15 周方向接続用金具
16ボルト
18 補強部材接続用金具
2 下水隔離装置
21 止水プラグ
21a 筒状本体
21b アウターシール
21c インナーシール
22 下水隔離用筒体
H マンホール
P 既設管
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing an existing pipeline such as a sewer pipeline, and in particular, a pipeline repair method suitable for repairing a large-diameter pipe having a diameter of 800 mm or more that allows a person to enter the pipe and work. About.
[0002]
[Prior art]
For example, as a method of repairing a large-diameter pipe of a sewer without opening, conventionally, a strip-shaped profile made of vinyl chloride with a rib formed on one side is spirally wound in an existing pipe, and the pipe is supported from the inside. A method of injecting a backfilling material between the existing pipe and the profile with the materials assembled, or a slightly wider strip (strip) made of vinyl chloride is spirally wound in the pipe to the inner surface of the existing pipe In order to keep the injection pressure when injecting the backfilling material between the inner surface of the existing pipe and the hose for injecting the backfilling material on the upper surface of the existing pipe before winding the strip A method of attaching a spacer to form a space to pass through, or by drawing a polyethylene tube with a stud into an existing tube and applying water pressure in the tube at the time of backfilling material injection, A method in which to prevent deformation of the cube are known.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional pipeline repair method as described above, a support material is assembled at the time of injection of the backfilling material, water pressure is applied, or a spacer for passing the backfilling material injection hose in advance is provided. It takes a lot of labor and time, and the cost is huge.
[0004]
In addition, in all of the conventional pipe repair methods described above, the strength of the repair member itself is low, and the structure is such that the necessary strength is obtained by integration with the backfill material. There is a problem in that ribs need to be densely arranged on the surface of the member that is in contact with the backfill material, and the backfill material does not spread sufficiently due to the presence of the large number of ribs. Here, in order to solve the problem and to reduce the injection pressure of the backfill material, a fluidizing material is added to the backfill material, but there is a problem that the cost increases accordingly. is there. Furthermore, since the required strength is relied on the backfilling material side, the backfilling material is required to have a suitable strength, and as a result, the price is high. Furthermore, since the strength of the repair member itself is low, it is unsuitable for repair when the strength of the existing pipe is severely reduced.
[0005]
The present invention was made to solve the problems in the conventional method for repairing pipelines at once, and requires pressure-resistant measures such as forming a support when applying backfilling material and applying water pressure. In addition, the backfilling material can be sufficiently distributed between the existing pipe and the repair member without adding a fluidizing material, and the strength of the backfilling material can be made lower than before. The purpose of the present invention is to provide a method for repairing a pipeline that can be applied to existing pipes that are severely painful due to corrosion or the like, and can sufficiently increase the strength of the pipeline after repair, even if an inexpensive backfill material is used.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the pipe line repair method of the invention according to the first aspect of the present invention provides a resin plate that can be carried in from a manhole substantially along the inner peripheral surface of the existing pipe in the manhole or the existing pipe. In this way, a plurality of reinforcing members made of a highly rigid material carried in from the manhole are integrated with the outer periphery of the resin plate formed in the cylindrical shape, and in a ring shape along the outer periphery. By assembling a cylindrical repair member having a resin surface material and a reinforcing ring integrated on its outer periphery, the repair members are axially connected to each other so that the required length is obtained. A method of injecting a backfilling material between the outer surface of the repair member after bonding and the inner surface of the existing pipe, and a plurality of surfaces extending along the axial direction on the surface of the resin plate facing the existing pipe inner surface Pipe-shaped members are integrated, Via a shaft which is inserted into the pipe-shaped member, characterized by the reinforcing member is integrated with the resin plate.
[0007]
Here, in the pipe line repair method according to the first aspect of the present invention, it is possible to adopt a configuration in which the resin plate has a shape obtained by dividing a cylindrical body having a predetermined length into a plurality of circumferential directions. it can.
[0008]
In the invention according to claim 1, the reinforcing member is formed with a through-hole penetrating in the cylinder length direction of the repair member, and is common to the pipe-shaped member integrated with the through-hole and the resin plate. When the shaft is inserted and both ends of the shaft are fastened with nuts, the reinforcing member can be integrated with the resin plate (claim 3).
[0009]
The present invention eliminates the need to build a support or apply water pressure to prevent deformation of the repair member due to the pressure at the time of injection of the backfilling material by giving the repair member itself sufficient strength, corrosion, etc. It is possible to give sufficient strength to existing painful pipes, and it is not necessary to densely arrange many ribs to obtain strength by integrating with backfilling material It is intended to facilitate the flow of the backfill material between the repair member and the existing pipe without adding a fluidizing material.
[0010]
That is, in the present invention, as a repair member arranged along the inner peripheral surface of the existing pipe, the resin plate as the surface material and the outer peripheral side of the resin plate, that is, the surface facing the inner surface of the existing pipe are integrated. A material composed of a reinforcing member made of a highly rigid material is used, and the resin plate and the reinforcing member have shapes and dimensions that can be carried in from a manhole. And since the reinforcement member is assembled into a ring shape along the periphery of the resin plate formed in a cylindrical shape and becomes a reinforcement ring, the strength of the repair member itself is greatly improved compared to the conventional case, and the repair member Due to its own strength, it can sufficiently withstand the pressure at the time of injection of the backfilling material and does not cause harmful deformation, and after the repair, plays a role against external water pressure or earth pressure. Therefore, sufficient strength can be given even if it is used for existing pipes with severe corrosion without particularly increasing the strength of the backfilling material. In addition, by increasing the strength of the repair member itself, it is not necessary to provide more ribs on the contact surface of the repair member with the backfill material so that it can be integrated with the backfill material. The flow is not hindered.
[0011]
Further, in the method of the present invention, the high-strength repair member as described above is appropriately divided into a resin plate and a reinforcing member, carried from the manhole, and assembled into a cylindrical shape in the manhole or existing pipe. It is possible to rehabilitate large-diameter pipes without doing this.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the above embodiment, the case where the pipe to be repaired has a circular cross section will be described. FIG. 1 is a partial cross-sectional front view showing a state in which a plurality of repair member units used in a pipe line repair method to which the present invention is applied are joined together in the axial direction, and FIG. 2 is a left side view thereof.
[0013]
One unit of the repair member in this example, that is, the repair member unit 1 forms a cylindrical shape having a length L as a whole, and has three shapes having a shape obtained by dividing the length L cylinder into three equal parts in the circumferential direction. In a state where the resin plate 11 and the three resin plates 11 are combined in a cylindrical shape, a plurality of reinforcing rings 12a and 12b arranged along the periphery thereof are mainly configured. Is an assembly of three arc-shaped reinforcing members 121a and 121b, which will be described later, in a ring shape.
[0014]
The resin plate 11 is made of, for example, high-density polyethylene, and FIG. 3 shows a front view (surface view) of the main part in the unfolded state, and FIGS. 4 and 5 show its AA sectional view and plan view. A plurality of pipe-like members 11b and T-shaped ribs 11c extending along the axial direction (bus line direction) are constant in the circumferential direction (arc direction) on one side of the main body portion 11a formed of a flat plate-like material in an arc shape. Is formed with an axial connection flange portion 11d having regular notches on two opposite sides of both ends in the busbar direction, and circumferential connection on the other two opposite sides. A flange portion 11e is formed. In FIG. 1, the rib 11c is not shown in order to avoid complication of the drawing.
[0015]
Reinforcing members 121a and 121b constituting the reinforcing rings 12a and 12b are high-rigidity members using steel and have substantially the same arc shape, and a front view of the reinforcing member 121a is shown in FIG. As shown, the thickness (the dimension in the direction orthogonal to the paper surface in FIG. 6) is uniform, and a plurality of through holes 120 are formed along the arc. Four reinforcing rings 12a and 12b are used for each reinforcing member unit 1, and four reinforcing rings 12a are used at the center and two reinforcing rings 12b are used at both ends.
[0016]
As shown in FIG. 7, a cross-sectional view along the axial direction of the pipe-shaped member 11b of the resin plate 11 is used for the joining and integration of the reinforcing rings 12a and 12b and the resin plate 11. The pipe-shaped members 11b and the pipe-shaped members 11b are arranged in two places between the three pipe-shaped members 11b arranged in a straight line and at two places on both ends thereof. A shaft 13a having male threads formed at both ends is inserted so as to penetrate both through holes 120 of each reinforcing ring 12a, and a nut 14a is fastened to each male thread 13a. On the other hand, one reinforcing ring 12b is provided at each end of each reinforcing member unit 1 along the inner end surface of each axial connection flange portion 11d, and one at a position slightly inside the reinforcing ring 12b. Be placed. The two reinforcing rings 12b arranged at each end of the adjacent repair member 1 unit 1 have a common shaft 13b in each through hole 120 with the axial connection flange 11d interposed therebetween. And the nuts 14b are fastened to the male screws formed at both ends thereof, so that the resin plate 11 is integrated with each other, and the adjacent repair member units 1 are connected to each other by the shaft 13b and the nut 14b. Bonded and integrated in the axial direction. In FIG. 7, S is a spacer, and R is a water blocking packing embedded in a gap formed between the axial flange portions 11d.
[0017]
The structure for integrating the three resin plates 11 and the plurality of reinforcing members 121a and 121b with each other in the circumferential direction is the circumferential direction of each resin plate 11 as shown in the sectional view of the circumferential joint portion in FIG. With the connecting flange portion 11e butted together, circumferential connection fittings 15 extending in the axial direction and having a plurality of through holes 150 formed in that direction are arranged on both sides of the connection flange portion 11e. The bolt 16 is passed through each of the through holes 150 of the metal fitting 15 and the nut 17 is fastened. The circumferential connection fitting 15 is fixed to the repair member unit 1 in a state of being fitted into a notch U (see FIG. 6) formed inside both ends of the reinforcing member 121a. Further, as shown in FIG. 1, the reinforcing members 121 a and 121 b adjacent to each other in the circumferential direction are attached to the butted portions of the reinforcing members 121 a and 121 b with the reinforcing member connecting metal fitting 18. By bolting the reinforcing member 121a or 121b on both sides, they are firmly integrated with each other to form the reinforcing ring 12a or 12b. In addition, R is the water stop packing embedded in the space | gap formed between the circumferential direction flange parts 11e. Further, in FIG. 1, the illustration of the circumferential connection fitting 15, the bolt 16, and the like is omitted in order to avoid complication of the drawing.
[0018]
Now, the resin plate 11 and the reinforcing members 121a, 121b, etc., which are parts constituting the repair member unit 1 described above, are straight when the repair target pipe line has a 1st manhole (manhole), for example. The diameter of the part passes through 900 mm, and only the manhole cover part is expanded when carrying in. Then, after these parts are carried into the manhole, they are assembled into a cylindrical repair member unit 1 having a length L in the manhole and the existing pipe leading to the manhole, and the repair member unit 1 is further joined in the axial direction. The state shown in FIG. Further, in this embodiment, the assembling of the repair member unit 1 and the joining operation in the axial direction are performed in the sewer isolation region where a sewage isolation device is inserted into the existing pipe to form a region where no sewage flows. . The specific method will be described below.
[0019]
FIG. 9 shows that the cylindrical repair member unit 1 is inserted into the existing pipe P by using the parts such as the resin plate 11 and the reinforcing members 121a and 121b in the sewage isolation region formed around the sewage isolation device 2. FIG. 10 is a schematic cross-sectional view showing a state of assembling, and FIG. 10 is an AA cross-sectional view thereof.
[0020]
The sewage isolation device 2 includes a water stop plug 21 in which an outer seal 21b and an inner seal 21c are provided on a cylindrical main body 21a, and a sewage isolation cylinder attached to a downstream end surface portion of the cylindrical main body 21a of the water stop plug 21. The body 22 is the main constituent.
[0021]
Each of the outer seal 21b and the inner seal 21c is a seal that expands by supplying air from the outside, and the outer seal 21b is configured by a plurality of donut-shaped hoses provided along the outer periphery of the cylindrical main body 21a. By inflating by supplying air, it abuts against the inner surface of the existing pipe P in a watertight manner. The inner seal 21c is a bag-like body whose periphery is airtightly fixed to the inner surface of the cylindrical main body 21a. By supplying air and inflating, the inner space of the cylindrical main body 21a is sealed watertight. Can do.
[0022]
The sewage isolation cylinder 22 is attached to the water stop plug 21 in the existing pipe P. The attachment work is performed in a state where air is supplied to the outer seal 21b and the inner seal 21c of the water stop plug 21 to temporarily stop the flow of sewage in the existing pipe P, and the sewage can be touched in the work. Absent. After the sewage isolation cylinder 22 is attached, the air in the inner seal 21c is discharged. Thus, the sewage that has flowed through the existing pipe P flows through the cylindrical main body 21a of the water stop plug 21 and the sewage isolation cylinder 22, and the sewage does not flow around the sewage isolation cylinder 22. That is, a sewer isolation region is formed.
[0023]
As shown in FIG. 9, the sewage separator 2 as described above is arranged so that the water stop plug 21 is located in the existing pipe P in the vicinity of the manhole H located on the upstream side of the pipe to be repaired. The resin plate 11 and the reinforcing members 121a and 121b constituting the repair member unit 1 are placed in the manhole H with the sewage isolation cylinder 22 mounted so as to be positioned at the invert portion of the manhole H. Carrying in sequentially, assembling the three resin plates 11 into a cylindrical shape, assembling them in a ring shape with the reinforcing members 121a and 121b along their surrounding specified positions, and forming them into a cylindrical shape by means of the shaft 13a, nut 14a, etc. The cylindrical reinforcing member unit 1 which is integrated with the assembled resin plate 11 and has a plurality of reinforcing rings 12a and 12b around it is completed. When one repair member unit 1 is completed, the repair member unit 1 is moved to the downstream side of the existing pipe P, and the next repair member 1 is assembled by the same procedure as described above. On the other hand, it is joined in the axial direction. In addition, when assembling the repair member unit 1 and moving it downstream, as shown in FIG. 9, it is good to pull with the wire 3 from the downstream.
[0024]
When the joined body of the repair member unit 1 having a length equal to the length of the pipe to be repaired is obtained by the above-described work, for example, a wife mold is attached to both ends thereof, and the outer peripheral surface of each repair member unit 1 and the existing pipe A back-filling material such as mortar is injected between the inner peripheral surface of P and the work is completed.
[0025]
Of particular note in the above method is that each repair member unit 1 assembled in a cylindrical shape within the manhole H and the existing pipe P leading to it has a plurality of reinforcements made of a highly rigid material such as steel along its outer periphery. Since the rings 12a and 12b have an integrated structure, the strength of the rings 12a and 12b is high and they can sufficiently withstand the injection pressure of the backfilling material. A method for withstanding pressure against the backfilling material injection pressure, such as applying water pressure from the inside, becomes unnecessary. In addition, since the strength of the repair member unit 1 itself is high, even if the strength of the existing pipe P is weakened due to corrosion or the like, sufficient strength can be imparted by repair, and high strength as a back-filling material. In addition, the number of ribs provided on the repair member for integration with the backfilling material can be reduced compared to the conventional one, resulting in fluidization of the backfilling material. It is possible to sufficiently spread the backfill material between the repair member and the existing pipe P without adding the material.
[0026]
In addition, when the construction method using the sewage isolation device 2 is employed as in the above embodiment, the work for assembling the repair member unit 1 and joining in the axial direction can be performed in the sewage isolation region. Since it is not necessary to stop the flow of sewage through the assembling work, it is possible to carry out the work without danger even for a sewer having a high flow rate or a sewer having a fast flow.
[0027]
The present invention is, for the division Suto of reinforcement rings, without being limited to the embodiments described above, also, in the above embodiments, although the existing pipe is described as a circular cross-section, for example The present invention can be equally applied to rectangular ridges (box culverts) and horseshoe-shaped ridges (arch culverts). In this case, the repair member units 1 and 30 have a shape corresponding to the cross-sectional shape of the tube ridges by assembly. What is necessary is just to form, and also when using the sewer isolation device 2, the thing of the cross-sectional shape according to the cross-sectional shape of the pipe tube made into object should just be used .
[0028]
【The invention's effect】
As described above, according to the present invention, in a pipe line repairing method in which a repair member is disposed substantially along an inner surface of an existing pipe and a backfill material is injected between the repair member and the existing pipe. When placing the repair member on the pipe, the resin plate carried from the manhole is formed into a cylindrical shape in the manhole and the existing pipe connected to the manhole, and is substantially along the inner surface of the existing pipe. By assembling the members into a ring shape along the outer periphery while integrating them with the periphery of the resin plate formed in a cylindrical shape, a cylindrical shape having a resin surface material and a reinforcing ring integrated on the outer periphery Since the repair members are assembled in order and the repair members are joined together in the axial direction so that the required length can be obtained, the strength of the repair member itself is significantly higher than conventional pipe repair methods. Since it can sufficiently withstand the injection pressure of the backfilling material itself, it does not require any work for pressure resistance such as support as in the conventional construction method or water pressure is applied from the inside, greatly reducing the construction cost. Can do.
[0041]
In addition, even when applied to the repair of existing pipes whose strength has been significantly reduced due to corrosion, etc. due to the increased strength of repair members, it is possible to give sufficient strength without using particularly high strength backfilling materials. In addition, since there is no need to densely arrange a large number of ribs to obtain strength by integrating with the backfill material as in the past, the use of the backfill material without using a backfill material with the addition of a fluidizing material. The filling degree can be increased, and an inexpensive material can be selected as the backfilling material.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing a state in which a plurality of repair member units 1 used in a pipe line repair method to which the present invention is applied are joined in an axial direction.
FIG. 2 is a left side view of FIG.
FIG. 3 is a front view (surface view) of a main part in a developed state of a resin plate 11 used in the repair member unit 1 of FIG. 1;
4 is a plan view of FIG. 3. FIG.
5 is a right side view of FIG. 3. FIG.
6 is a front view of a reinforcing member 121a used in the repair member unit 1 of FIG.
FIG. 7 is an explanatory view of joining and integration of the reinforcing members 121a and 121b and the resin plate 11, and is a cross-sectional view of a main part cut along the axial direction of the pipe-like member 11b of the resin plate 11.
FIG. 8 is an explanatory diagram of a structure for integrating the resin plates 11 and the reinforcing members 121a and 121b with each other in the circumferential direction, and is a cross-sectional view of the circumferential joint portion.
FIG. 9 is a schematic cross-sectional view showing a state where a sewage separator 2 is inserted into an existing pipe P in a pipe line repair method to which the present invention is applied.
10 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,30 Repair member unit 11,31 Resin board 11a Flat plate main body part 11b Pipe-shaped member 11c T-shaped rib 11d Axial connection flange part 11e Circumferential connection flange part 12a, 12b Reinforcement ring 120 Through-hole 121a, 121b Reinforcing member 13a, 13b Shaft 14a, 14b, 17 Nut 15 Circumferential connecting bracket 16 Bolt 18 Reinforcing member connecting bracket 2 Sewage isolation device 21 Water stop plug 21a Cylindrical body 21b Outer seal 21c Inner seal 22 Sewage isolation cylinder Body H Manhole P Existing pipe

Claims (3)

マンホールからの搬入が可能な樹脂板を、マンホールまたは既設管内で当該既設管の内周面に略沿うように筒状に形成するとともに、上記マンホールから搬入した高剛性材料からなる複数の補強部材を、上記筒状に形成した樹脂板の外周に対して一体化させつつその外周に沿ったリング状に組み立てることにより、樹脂製の表面材とその外周に一体化された補強リングを有してなる筒状の補修部材を順次組み立てつつ、所要長さが得られるように各補修部材を互いに軸方向に接合し、接合後の補修部材の外面と既設管の内面との間に裏込め材を注入する方法であって、上記樹脂板の既設管内面に向く面に、軸方向に沿って伸びる複数のパイプ状部材が一体化され、その各パイプ状部材に挿入されるシャフトを介して、上記補強部材が樹脂板に一体化されることを特徴とする管路の補修方法。  A resin plate that can be carried in from the manhole is formed in a cylindrical shape so as to substantially follow the inner peripheral surface of the existing pipe in the manhole or the existing pipe, and a plurality of reinforcing members made of a highly rigid material carried in from the manhole are provided. The resin plate is integrated with the outer periphery of the resin plate formed into a ring shape along the outer periphery, thereby having a resin surface material and a reinforcing ring integrated with the outer periphery. While assembling the cylindrical repair members in sequence, each repair member is joined to each other in the axial direction so that the required length can be obtained, and a backfill material is injected between the outer surface of the repaired member after joining and the inner surface of the existing pipe A plurality of pipe-like members extending along the axial direction are integrated with a surface of the resin plate facing the inner surface of the existing pipe, and the reinforcement is performed via a shaft inserted into each pipe-like member. The member is a resin plate A method of repairing a conduit, characterized in that it is embodied. 上記樹脂板が、所定長さの筒体を周方向に複数に分割した形状を有していることを特徴とする請求項1に記載の管路の補修方法。  The pipe line repair method according to claim 1, wherein the resin plate has a shape obtained by dividing a cylindrical body having a predetermined length into a plurality of circumferential directions. 上記補強部材に、補修部材の筒長方向に貫通する貫通孔が形成されているとともに、その貫通孔と上記樹脂板に一体化されたパイプ状部材に共通のシャフトが挿入されて当該シャフトの両端をナットで締結することにより、上記補強部材が樹脂板に一体化されることを特徴とする請求項1または2に記載の管路の補修方法。  The reinforcing member is formed with a through-hole penetrating in the cylinder length direction of the repair member, and a common shaft is inserted into the pipe-shaped member integrated with the through-hole and the resin plate so that both ends of the shaft The pipe line repair method according to claim 1 or 2, wherein the reinforcing member is integrated with the resin plate by fastening the nut with a nut.
JP25450599A 1999-09-08 1999-09-08 Pipe repair method Expired - Fee Related JP4301420B2 (en)

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JP4360505B2 (en) * 1999-09-17 2009-11-11 芦森工業株式会社 Pipe repair method
JP3939702B2 (en) * 2004-02-27 2007-07-04 クボタシーアイ株式会社 Rehabilitation of existing pipes
JP4179619B2 (en) * 2005-04-28 2008-11-12 栄喜 木村 Rehabilitation pipe and rehabilitation method for underground buried pipe
JP6863781B2 (en) * 2017-03-13 2021-04-21 積水化学工業株式会社 How to ensure safety in existing pipes and shelter for existing pipes

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JPH0351956B2 (en) * 1986-12-16 1991-08-08 Teihyuu Kk
JPS6421124A (en) * 1987-07-16 1989-01-24 Sekisui Chemical Co Ltd Formation of lining pipe
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JPH067119Y2 (en) * 1988-11-25 1994-02-23 株式会社クボタ Sealing structure for inner pipe
JPH032085U (en) * 1989-05-29 1991-01-10
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JP2802915B2 (en) * 1996-11-18 1998-09-24 積進産業株式会社 Underground pipe rehabilitation pipe
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