JP3890293B2

JP3890293B2 - Propulsion method and connection structure for propulsion method tube

Info

Publication number: JP3890293B2
Application number: JP2002350090A
Authority: JP
Inventors: 英雄新井; 秀樹桑原; 和良西川; 信行長井; 恭二竹村; 正士金子; 正樹田中; 敏峰江崎
Original assignee: Sumitomo Mitsui Construction Co Ltd
Current assignee: Sumitomo Mitsui Construction Co Ltd
Priority date: 2002-12-02
Filing date: 2002-12-02
Publication date: 2007-03-07
Anticipated expiration: 2022-12-02
Also published as: JP2004183289A

Description

【０００１】
【発明の属する技術分野】
本願に係る発明は、管体を地中に押し込んで地中管路を構築する推進工法及び推進工法に用いる管体の接続構造に係り、特に周方向に分割された複数のセグメントを組み立てて構成された管体を用いる推進工法及びこのような管体の接続構造に関するものである。
【０００２】
【従来の技術】
上下水道として用いられる管渠、電力ケーブル・通信ケーブル・ガス管等を配設するための管渠の構築方法として、推進工法が広く知られている。この工法は、立坑から横方向に推進管を地中に押し込むとともに、後方端に順次管体を継ぎ足し、所定長の地中管路を構築するものである。
【０００３】
この工法で用いられる管体は、一般にコンクリートからなり、工場で所定長に分割して形成され、現場に搬入される。そして、立坑内で先に押し込まれた管の後方端に接合され、さらに後方からジャッキで横方向に押し込まれる。
【０００４】
上記管体は、一方の端部に他の管体との接続部を外側から覆うように鋼製カラーが取り付けられているものがある。この鋼製カラーは、接続部における止水性を確保するために設けられるものである。
【０００５】
推進工法によって形成される管渠が曲線部を有する場合、後方から推進される管体は曲線部に差し掛かった時に接続部に角度が設けられ、所定長の管体が曲線状に連なったものとして推進されてゆく。このため管体の接続部で対向する端面は常に密着しているものではなく、曲線部の外側では接続された管体の二つの端面間に隙間を生じることになる。このため、接続された管体の端面間に隙間があっても地下水の流入を防ぐことができる止水性が求められ、上記鋼製カラーで止水性を確保するものとなっている。
【０００６】
上記鋼製カラー及びこの鋼製カラーを用いた管体の接続構造については、いくつかの提案がなされており（例えば、特許文献１、特許文献２、特許文献３）、鋼製カラーが接続される管体の一方の外周部に固着されている。そして、他方の管体がこの鋼製カラーの内側に挿入され、この鋼製カラーの内周面と挿入された管体の外周面との間に止水材が介挿されるものとなっている。
【０００７】
【特許文献１】
特開２００２−２７６２８６号公報
【特許文献２】
特開２００１−３４２７９５号公報
【特許文献３】
特開平１０−２１２８９７号公報
【特許文献４】
特開平１０−１５９４８７号公報
【０００８】
【発明が解決しようとする課題】
上記のような推進工法で従来から構築されている管渠は、径が約３ｍ以下のものがほとんどである。これは、工場で構築され、現場へ輸送される管体の径が３ｍを超えると輸送が困難になることに起因している。しかし、都市部における共同溝の普及等にともない、大口径の管渠を推進工法で構築することが求められるようになっている。
【０００９】
一般に、大口径の管渠又は都市部におけるトンネルの構築はシールド工法によるものが多く、このシールド工法では覆工体つまり管体は周方向に複数のセグメント組み合わせて形成される。しかし、シールド工法では、セグメントは掘削を行っている切羽のすぐ後方で組み立て、建て込まれる。そして、管体は移動するものではない。このため、セグメントの接合部で地下水の流入を防止するための止水性を確保することも比較的に簡単である。
【００１０】
これに対し、推進工法では、管体が軸線方向に強く押し込まれ、大きな応力が生じるとともに、管渠の軸線方向に移動する。そして、曲線部では接続された各管体間で、間隙が生じたり、この隙間が消滅したりすることになる。このため、軸線方向の接続部では、上記特許文献に記載されているような特有の止水構造が必要となる。そして、周方向に複数のセグメント組み立てて管体を構成するとセグメント間の接合部にも止水性が要求され、施工中における止水性の確保等に困難があると考えられてきた。
【００１１】
本願に係る発明は、上記のような事情に鑑みてなされたものであり、その目的は、大口径の地中管路を構築することができるとともに、充分な止水性を維持することができる推進工法及びこの工法で好適に用いることができる管体の接続構造を提供するものである。
【００１２】
【課題を解決するための手段】
上記課題を解決するために、請求項１に係る発明は、地中管路の覆工体となる推進管をその中心軸線方向の地中に押し出すとともに、所定長の管体を順次押し出しの後方側に接続して押し出し動作を繰り返す推進工法であって、前記管体は、周方向に複数に分割されたコンクリートセグメントを組み立てて形成するものとし、該セグメントの製作時には、管体の推進方向の後方端に、隣接される管体との接続部を外側から囲む鋼製カラーを該セグメントの周方向に沿って固定するとともに、該セグメントと前記鋼製カラーとの間には該鋼製カラーに密着させて周方向に第１の止水材を介挿しておき、該セグメントを組み立てて管体とする時には、前記鋼製カラーを管状に接合するとともに、周方向の前記第１の止水材が管体の全周にわたって連続するものとし、該セグメントの接合部には該管体の推進方向と平行な端面に沿って双方のセグメント間に第２の止水材を介挿し、該第２の止水材と周方向に配置された前記第１の止水材とを連続させ、前記管体を推進方向に接合する時には、管状となった前記鋼製カラーの内側に接合する他の管体の前方端を挿入し、この接合する管体の前方端付近の外周面と管状となった前記鋼製カラーの内周面との間にリング状となった第３の止水材を介挿し、前記管体の推進方向に沿って配置された第２の止水材をリング状の前記第３の止水材と連続させる推進工法を提供する。
【００１３】
この推進工法では、順次接続される所定長の管体は、複数のセグメントを組み立てて形成するので、管体の口径が大きなものであっても、工場で製作したそれぞれのセグメントは容易に現場に搬送することができる。そして組み立てた管体を接続して地中に押し込んでゆくことによって大口径の地中管路を構築することができる。
【００１４】
また、セグメントを組み立てて管体とするときの接合部には、第２の止水材を管体の中心軸線方向に介挿するので、接合部での高い止水性が維持され、施工中及び施工完了後にもこの部分からの浸水を防止することができる。
さらに、推進方向に接続する管体には、その接続部の外側を囲むように鋼製のカラーを設け、この鋼製カラーとコンクリートの管体との間にも周方向に第１の止水材及び第３の止水材を配置するので、施工中の接続部で止水性が確保される。つまり、鋼製カラーとこれが固定されたコンクリートの管体との間は双方が密着していても鋼製カラーの内周面に沿って漏水が生じるおそれがあるが、鋼製カラーに密着して第１の止水材を配置するので、鋼製カラーの内面に沿った浸水が防止される。また、管体の前方部と、この管体が挿入される鋼製カラーとの間には、リング状の止水材を介挿するので鋼製カラーと接続されるコンクリート管体との間の止水性も維持される。
そして、セグメントを組み立てた接合部に沿って介挿した第２の止水材の後方及び前方の端部は、それぞれが円周方向に配置した第１の止水材及び第３の止水材に連続するので、セグメントの接合部の両端部でも高い止水性を維持することができる。
【００１５】
請求項２に係る発明は、請求項１に記載の推進工法において、前記セグメントを組み立てて管体とするときには、セグメント間に介挿する前記第２の止水材を管体の前方端付近で外周面に露出するように配置し、前記管体を推進方向に接合するときには、リング状の前記第３の止水材を、前記第２の止水材の露出部に装着して密着させるものである。
【００１６】
この推進工法では、セグメントを組み立てて管体とした後、前方端付近にリング状の第３の止水材を装着することによって、この第３の止水材が、管体の外周面に露出した第２の止水材と密着し、双方を連続したものとすることができる。したがって、セグメント接合部の前方端での止水性を容易に確保することができる。
【００１７】
請求項３に係る発明は、請求項１に記載の推進工法において、前記セグメントを組み立てて管体とする時には、該セグメントのコンクリート中に配置された緊張材によって周方向にプレストレスを導入し、その後、前記鋼製カラーを溶接によって周方向に連続するように接合するものである。
【００１８】
この推進工法では、コンクリートのセグメントを周方向のプレストレスを導入することによって組み立てるので、セグメントの端面は互いに密着し、強固に一体化される。また、これらの端面間に第２の止水材を介挿するので、この第2の止水材とコンクリートとの密着性も良好となり、高い止水性が確保される。
また、鋼製カラーは溶接によって接合するので接合部の止水性を確実に得ることができる。
【００１９】
請求項４に係る発明は、請求項３に記載の推進工法において、前記セグメントの製作時には、前記鋼製カラーの接合部の内周面と前記セグメントのコンクリートとの間に空隙を設けておき、前記鋼製カラーを溶接によって接合した後、前記空隙に止水性を有する充填材を充填することによって、周方向に配置された前記第１の止水材を全周にわたって連続したものとする。
【００２０】
一般に止水材は熱によって損傷を受けやすいものが多く、鋼製カラーの溶接をする時に、この鋼製カラーに密着するように配置した第１の止水材を溶接時の加熱で損傷することが考えられる。しかし、この推進工法では、鋼製カラーの接合部の内側に空隙が設けられた状態で溶接を行う。そして、溶接による鋼製カラーの接合が完了した後に充填材を充填するので、この部分では第１の止水材を切り欠いておき、充填材で第２の止水材を周方向に連続したものとすることができる。したがって、止水材が溶接による熱の影響をうけて欠陥を生じることもなく、止水性を確保することができる。
【００２１】
請求項５に係る発明は、中心軸方向に順次接続され、地中に押し込まれて地中管路の覆工体となる推進工法用管体の接続構造であって、前記管体は、周方向に複数に分割されたコンクリートのセグメントを組み立てて形成されたものであり、前記管体の推進方向における後方の端部には、他の管体との接続部を外側から囲む管状の鋼製カラーが、一部を突き出して固着されており、管状の鋼製カラーとこの鋼製カラーが固定されたコンクリートの管体との間には、全周にわたって周方向に連続する第１の止水材が介挿され、前記管体を構成する複数のセグメントの接合部には、管体の推進方向に沿って第２の止水材が介挿され、前記第１の止水材と前記第２の止水材とが連続しており、接続される他の管体の前方部は、前記鋼製カラーの突き出した部分の内側に挿入され、該管体の外周面と前記鋼製カラーの内周面との間にリング状の第３の止水材が介挿されている推進工法用管体の接続構造を提供するものである。
【００２２】
この接続構造では、推進方向に接続される管体には、その接続部の外側を囲むように鋼製のカラーが設けられており、この鋼製カラーとコンクリートの管体との間には周方向に第１の止水材及び第３の止水材が配置されているので、施工中における接続部での止水性が確保される。
また、セグメントを組み立てて管体とするときの接合部には、第２の止水材が管体の中心軸線方向に介挿され、接合部での高い止水性が維持されるとともに、この第２の止水材が、周方向に配置された第１の止水材及び第３の止水材と連続するものとなっているので、施工中及び施工完了後にも接合される管体の両端付近におけるセグメント接合部から浸水するのを防止することができる。
【００２３】
請求項６に係る発明は、請求項５に記載の接続構造において、前記セグメント間に介挿された前記第２の止水材は、管体の前方端付近で外周面に露出するように配置され、リング状の前記第３の止水材は、前記第２の止水材の露出部に装着され密着しているものとする。
【００２４】
この接続構造では、管体の前方端付近に装着されたリング状の第３の止水材が、管体の外周面に露出した第２の止水材と密着し、双方が連続したものとなっている。したがって、リング状となった第３の止水材でコンクリートの管体と鋼製のカラーとの間の止水性が保たれるとともに、セグメントの接合位置の前方側端部でも高い止水性が維持される。
【００２５】
請求項７に係る発明は、請求項５に記載の接続構造において、前記鋼製カラーは、前記セグメントの組み立て時に溶接によって管状に連結されたものであり、該鋼製カラーが取り付けられたコンクリートからなる管体の後方の端部は、該鋼製カラーの溶接による連結部付近の内周面とコンクリートからなる管体との間に空隙が設けられており、前記鋼製カラーが溶接によって周方向に接合された後に前記空隙に充填された止水性を有する充填材により、周方向に配置された前記第１の止水材が全周にわたって連続するものとする。
【００２６】
この接続構造では、鋼製カラーの溶接による接合後に、その内側に充填された充填材によって、鋼製カラーに密着して周方向に配置された第１の止水材が周方向に連続したものとなる。このため、セグメントを周方向に接合した部分でも確実に周方向の止水材が連続し、鋼製カラーに密着したものとなる。したがって、鋼製カラーとこれが固着されたコンクリートの管体との間の止水性が良好に維持される。また、この周方向の第１の止水材がセグメントの接合部に介挿された第２の止水材とも連続しているので、セグメント接合部の後方端付近での止水性も確保される。
なお、周方向の第１の止水材とセグメント接合部に介挿された第２の止水材との間も、鋼製カラーの溶接接合後に充填された充填材によって連結されるものとするのが望ましい。これによって、第１の止水材と第２の止水材と連続性も、溶接による熱の影響を受けることなく、確実に維持される。
【００２７】
請求項８に係る発明は、請求項５に記載の接続構造において、前記鋼製カラーは、前記セグメントの組み立て時に溶接によって管状に連結されたものであり、該鋼製カラーの内周面から内側のコンクリート中に突き出し、周方向に連続した板状の埋め込み部を有し、周方向に配置された前記第１の止水材は、該埋め込み部に密着してコンクリート中に埋め込まれているものとする。
【００２８】
この接続構造では、第１の止水材は鋼製カラーの管状部から内側に突き出した部分に密着しているので、セグメントを組み立てて接合するときに、上記鋼製カラーの管状部を溶接によって連結しても、その熱の影響を受けにくい。したがって、セグメントの接合部で周方向に連続した第１の止水材が損傷を受けることがなく、止水性が確実に維持される。
【００２９】
請求項９に係る発明は、請求項８に記載の接続構造において、前記鋼製カラーの溶接による連結部分とこの鋼製カラーが固定されるコンクリートとの間に、該コンクリートを切り欠いて該管体の外周面側に開放された空隙が設けられており、鋼製カラーが溶接によって周方向に接合された後に前記空隙に充填された止水性を有する充填材により、周方向に配置された前記第１の止水材と前記鋼製カラーとが連続するものとする。
【００３０】
この接続構造では、第１の止水材が鋼製カラーの管状部から内側に離れた位置に配置されるので、セグメントの接合部で第１の止水材と鋼製カラーの管状部との間に、セグメントの接合面に沿って水が侵入するおそれがある。しかし、鋼製カラーとコンククリートとの間に設けられた空隙に充填された充填材によって、鋼製カラーと第１の止水材とが連続したものとなっているのでこの部分からの浸水は防止され、止水性が維持される。
【００３１】
【発明の実施の形態】
以下、本願に係る発明の実施の形態を図に基づいて説明する。
図１は、請求項１から請求項４までに記載の発明の一実施形態である推進工法の概要を示す概略説明図である。
この推進工法は、推進を開始する位置に立坑１を設け、この立坑の一方の壁面からほぼ水平方向に連続した管（推進管２）を押し込み、地中に推進させるものである。立坑１の反対側の壁面には反力壁３を設け、この反力壁３と推進管２の後方端との間に介挿したジャッキ４により管を押し進める。そして、順次所定長の管体２０を、押し込まれた管２の後方端とジャッキ４との間に継ぎ足し、所定の距離まで押し込んで管路を形成するものである。
【００３２】
上記立坑１は、山留め１１及び腹おこし１２等によって壁面が崩壊しないように保持され、その壁面に開口を設けて、ここから水平方向に推進管２を押し出す。そして、反対側の壁面に形成したコンクリートの反力壁３にはジャッキ台５を介して押し出し用のジャッキ４を配備し、このジャッキ４によりストラッド６を介して推進管２に推力を与える。上記ストラッド６は、ジャッキ４のストロークに限界があるため推進管２の移動にともなって管２の後端とジャッキ４との間に介挿し、ジャッキ４の推力を管に伝達するものである。
【００３３】
立坑１の上部には門型クレーン７を配備し、所定長の管体２０を吊り上げて、立坑１内に搬入する。また、管２の推進にともなって構内から掘り出された土砂８を上記門型クレーン７を用いて排出する。
【００３４】
地中に押し込む推進管２はコンクリートからなるものであり、推進が進行するのにともなって既に押し込まれている管２の後方端に順次所定長の管体２０を接続する。図２は、上記管体２０の側面図及び横断面であり、図３は縦断面図である。
それぞれ管体２０の後方端には鋼製カラー２１を設けておき、後方に接続する管体２０ａの前方部２２は、前方にある管体２０ｂに固着された鋼製カラー２１ｂの内側に挿入し、この鋼製カラー２１ｂが接合部を外側から覆うものとしている。そして、この鋼製カラー２１ｂと、これが固着されたコンクリートの管体２０ｂとの間には、セグメントの製作時に、鋼製カラー２１ｂに密着するように第１の止水材２３を周方向に連続して介挿しておき、鋼製カラー２１とコンクリートの管体２０との間から地下水が侵入するのを防止する。また、鋼製カラー２１ｂの内周面と、内側に挿入された後続の管体２０ａの外周面との間にリング状の第３の止水材２５を介挿し、これらの間から管体の内側に水が侵入するのを防止する。
なお、図３中に示す符号３３は、鋼製カラー２１をコンクリートと強固に一体化するために、鋼製カラー２１の周方向に沿って溶接された棒鋼を示すものである。
【００３５】
上記管体２０の製作は工場において行われ、図２に示すように、管を軸線方向に２つに分割して製作し、現場で管状に組み立てるものである。分割されたセグメント２０’は、口径が大きなものであっても、図４に示すようにトレーラー９等で搬送することが可能となる。そして現場では、図５に示すように、組み合わせる一方のセグメント２０’ａを固定支持した上に他のセグメント２０’ｂを上方から接合し、周方向にＰＣ緊張材２７で締め付けて強固に一体化する。このとき双方のセグメント２０’ａ，２０’ｂの接合面間には、管体の軸線方向に沿って第２の止水材２４を介挿する。また、接合する双方のセグメント２０’ａ，２０’ｂに貫入するようにせん断キー２６を装着する。ＰＣ緊張材２７は、セグメント２０にあらかじめ形成しておいたダクト内に現場で挿通し、ジャッキで緊張力を導入した後、セグメント２０の外周面側に固着されたアンカー２８に定着する。
【００３６】
次に上記管体２０を構成するセグメント２０’の製作及びこれらを管状に組み立てて推進方向に接続する構造及び方法について説明する。なお、この管体の接続構造は、請求項５から請求項７までのそれぞれに記載の発明の実施形態である。
鋼製カラー２１は、分割したセグメントに合わせて全周を１／２ずつに分割して製作し、これを型枠と連続するように配置する。そして、鋼製カラーの内周面に密着して周方向に連続する第１の止水材２３を配置し、この止水材を埋め込むとともにこの半割りにされた鋼製カラーと一体となるようにコンクリートを打設してコンクリート製のセグメント２０’を形成する。上記第１の止水材２３は、鋼製カラー２１及びコンクリートと密着してこれらの間に水が侵入するのを遮断するものであり、柔軟な合成樹脂、ゴム等を用いることができる。
【００３７】
図６は、上記セグメント２０’の接合面を示す端面図及びセグメント２０’の接合部を外側から見た図である。この半割りにされたセグメント２０’の周方向端部には、鋼製カラー２１とコンクリートとの間に空隙３１を設けておき、周方向に配置した第１の止水材２３はこの空隙３１内に露出させておく。また、セグメント２０’を管状に組み立てるときの接合面には、管体２０’の中心軸線と平行に溝３２を形成しておき、この溝３２内に第２の止水材２４を接着し、接合するセグメント間に挟み込むように介挿する。この第２の止水材２４は、管体２０の後方の端部では、外周面に向けて連続するように配置し、鋼製カラー２１とコンクリートとの間に形成された上記空隙３１内に露出するように配置する。また、前方の端部２２では、第２の止水材２４が外周面に向かって連続するように配置し、セグメントを組み立てたときに、第２の止水材２４を外周面に露出して多少突出させる。
【００３８】
二つの半割りにされたセグメント２０’ａ，２０’ｂを管状に組み立てて、プレストレスの導入により一体化すると、鋼製カラー２１は、図７に示すようにセグメント２０’の接合部で周方向の端面が突き合わされており、これらの両端を溶接によって接合し、鋼製カラー２１を管状に連続したものとする。このとき接合部の内側は、コンクリートとの間に空隙３１が設けられており、周方向の第１の止水材２３及びセグメント２０’の接合面に沿って配置された第２の止水材２４とは隔離しているので、外側から溶接によって鋼製カラー２１を接合しても、止水材２３，２４には溶接の熱による影響は及ばない。また、溶接時にはこの空隙３１内にバックアップ用の鋼板材を挿入し、鋼製カラーの背面に当接させることができるので、良好な条件で溶接を行うことができる。
【００３９】
溶接による鋼製カラー２１の接合が完了すると、鋼製カラー２１の内側の空隙３１内に充填材を充填する。この充填材は、充填時には空隙内の隅々にまで充填できる流動性を有し、充填後には硬度は大きくなるがある程度の柔軟性を有するもので、この充填部分の止水性を保持できるものを用いる。上記充填材を空隙に充填することにより周方向に配置された第１の止水材２３は周方向に連続して止水性を有するものとなり、さらにこの第１の止水材２３とセグメント２０’の接合面間に介挿された第２の止水材２４とが連続したものとなる。これによって管体の後端部における止水性が確保される。
【００４０】
一方、管体２０の前方端付近には、ゴム製のリング状となった第３の止水材２５を装着する。そして、第２の止水材２４が管体２０の外周面に露出している部分の上に巻きつけ、双方の止水材２５，２４を密着させる。この第３の止水材２５は、接合される前方の管体２０ｂの鋼製カラー２１ｂの内側に挿入され、内周面に当接される。これによって、隣接する管体２０ｂの鋼製カラー２１ｂとの間の止水性が確保されるとともに、セグメントの接合部の前方端部での止水性も確保される。また、第３の止水材２５は、鋼製カラー２１ｂの内周面との間で摺動が可能であり、管体２０の接合部で軸線方向に相対的な移動が生じても、止水性が保持される。
【００４１】
次に、図１に示す推進工法で用いることができる他の管体の接合構造であって、請求項８又は請求項９に記載の発明の一実施形態である接続構造について説明する。
図８は、この接続構造で用いられる管体の縦断面図であり、図９は、この管体を構成するセグメントの接合端面を示す概略図である。また、図１０は、図９中に示すＡ−Ａ線での断面図であり、図１１は、図９中に示すＢ−Ｂ線での断面図である。
【００４２】
この管体４０は、図２及び図３に示す管体２０と同様に、２つのセグメントを組み合わせて形成されたものであり、後方の端部に鋼製カラー４１が固着されている。鋼製カラー４１は、管体４０の内側に突出してコンクリート中に埋め込まれた埋め込み部５１を有している。この埋め込み部５１は周方向に連続して鋼製カラー４１の内周面とほぼ直角に突き出しており、推進方向における前方側の面に第１の止水材４３が密着し、周方向に連続している。したがって、コンクリートと鋼製カラー４１との間に地下水が侵入しても上記第１の止水材４３によって遮蔽され、管体の内側への漏水が防止される。
【００４３】
このような構造の管体４０を構成するセグメント４０’の周方向の端面は、図９に示すように管体４０の軸線方向に溝５２が形成されており、この部分に第２の止水材４４が配置され、２つのセグメント間に挟み込むように介挿される。この第２の止水材４４は、後方側の端部では、図１１に示すように周方向に配置された第１の止水材４３に当接され、連続したものとなっている。また、前方の端部では外周面側に露出し、管体４０の前方部４２で外周面に装着されるリング状の第３の止水材４５に当接される。これにより、セグメントの接合面における両端部での止水性が確保される。
【００４４】
セグメントの周方向における端部では、図１０に示すように鋼製カラー４１は溶接によって管状に接合されるものであり、溶接接合を良好に行うことができるように鋼製カラー４１の内側に、あて板５３が介挿されている。また、図１２に示すように、推進方向における鋼製カラー４１の前方部にはコンクリートの管体の外周面に開口する切り欠き５４を設けておくのが望ましい。この切り欠き５４は、鋼製カラー４１の内側で、埋め込み部５１の前面及び第１の止水材４３、第２の止水材４４に連続するものとなっている。そして、この切り欠き５４には、鋼製カラー４１を溶接によって接合した後に柔軟な充填材が充填され、鋼製カラー４１と第１の止水材４３との間が止水性のある充填材で連続したものとなる。これにより、埋め込み部５１はセグメントの接合部で溶接されていないが、鋼製カラー４１と第１の止水材４３との間から管体内に地下水が侵入するのを防止することができる。
【００４５】
このように組み立てられた管体４０は、図２から図７までに示す管体２０と同様に、推進にともなって推進管の後端に接続されるものであり、図９に示すようにそれぞれの管体４０の後方端部に設けられた鋼製カラー４１の内側に後続の管体４０ａの前方部４２が挿入される。そして、鋼製カラー４１の内周面が後続の管体４０ａの前方部に装着されたリング状の第３の止水材４５と密着し、この第３の止水材４５が推進方向に摺動可能となる。したがって、接続された双方の管体４０ａ，４０ｂが中心軸線方向に相対的な変位を生じても止水性が維持される。
【００４６】
【発明の効果】
以上説明したように、本願発明に係る推進工法及びこれに用いる管体の接続構造では、管体は複数のセグメントを周方向に組み立てて形成されており、各セグメントは工場で製作しても容易に現場に搬入することができる。したがって、大口径の管体を用いて地中管路を構築することができる。また、セグメントの接合部では推進方向の接合面に沿って第２の止水材が介挿され、これらの両端部は周方向に連続した第１の止水材及び第３の止水材と連続したものとなるので、セグメントの接合部及び管体の接続部で高い止水性が得られる。
【図面の簡単な説明】
【図１】本願に係る発明の一実施形態である推進工法の概要を示す概略断面図である。
【図２】本願に係る発明の推進工法で用いられる管体の側面図及び横断面図である。
【図３】図２に示す管体及びこの管体を軸線方向に接続する部分の縦断面図である。
【図４】図２に示す管体を構成するセグメントの輸送状態を示す概略図である。
【図５】図２に示す管体を組み立てる状態を示す概略図である。
【図６】図２に示す管体を構成するセグメントの接合面を示す概略図及び接合部を外側から見た図である。
【図７】図２に示す管体の後方端付近におけるセグメント接合部の横断面図である。
【図８】図１に示す推進工法で用いることができる管体の他の例を示す縦断面図である。
【図９】図８に示す管体を構成するセグメントの接合端面を示す概略図である。
【図１０】図９中に示すＡ−Ａ線での断面図である。
【図１１】図９中に示すＢ−Ｂ線での断面図である。
【図１２】図８に示す管体を構成するセグメントの後方端付近の端面を示す概略図、及びセグメントの接合部における後方端付近の外周面を示す概略図である。
【符号の説明】
１立坑
２推進管
３反力壁
４ジャッキ
５ジャッキ台
６ストラット
７門型クレーン
８土砂
９トレーラー
１１山留め
１２腹おこし
２０，４０管体
２０’、４０’ 管体を構成するセグメント
２１，４１鋼製カラー
２２，４２管体の前方部
２３，４３第１の止水材
２４，４４第２の止水材
２５，４５第３の止水材
２６せん断キー
２７ＰＣ緊張材
２８アンカー
３１空隙
３２周方向に溶接された棒鋼
３３溝
５１埋め込み部
５２溝
５３あて板
５４切り欠き[0001]
BACKGROUND OF THE INVENTION
The invention according to the present application relates to a propulsion method that pushes a tube into the ground and constructs an underground conduit, and a tube connection structure used in the propulsion method, and particularly includes a plurality of segments divided in the circumferential direction. The present invention relates to a propulsion method using such a tubular body and a connection structure for such a tubular body.
[0002]
[Prior art]
A propulsion method is widely known as a method for constructing pipes used for water and sewage, pipes for arranging power cables, communication cables, gas pipes, and the like. In this method, the propelling pipe is pushed into the ground laterally from the vertical shaft, and the pipe body is sequentially added to the rear end to construct the underground pipe having a predetermined length.
[0003]
The tubular body used in this construction method is generally made of concrete, is divided into predetermined lengths at a factory, and is carried to the site. And it is joined to the rear end of the pipe pushed in first in the shaft, and further pushed in the lateral direction with a jack from the rear.
[0004]
Some of the above-mentioned tubular bodies have a steel collar attached to one end so as to cover the connecting portion with the other tubular body from the outside. This steel collar is provided in order to ensure water-stopping at the connecting portion.
[0005]
When the pipe rod formed by the propulsion method has a curved part, the pipe body propelled from the rear is provided with an angle at the connection part when it reaches the curved part, and the pipe body of a predetermined length is connected in a curved shape. It will be promoted. For this reason, the end faces facing each other at the connecting portion of the tubular body are not always in close contact with each other, and a gap is formed between the two end faces of the connected tubular bodies outside the curved portion. For this reason, even if there is a gap between the end faces of the connected pipe bodies, water stoppage that can prevent the inflow of groundwater is required, and the water stoppage is ensured by the steel collar.
[0006]
Several proposals have been made on the steel collar and the pipe connecting structure using the steel collar (for example, Patent Document 1, Patent Document 2, and Patent Document 3), and the steel collar is connected. Is fixed to one outer peripheral portion of the tube body. And the other tubular body is inserted inside this steel collar, and a water stop material is inserted between the inner peripheral surface of this steel collar and the outer peripheral surface of the inserted tubular body. .
[0007]
[Patent Document 1]
JP 2002-276286 A
[Patent Document 2]
Japanese Patent Laid-Open No. 2001-342795
[Patent Document 3]
Japanese Patent Laid-Open No. 10-212897
[Patent Document 4]
Japanese Patent Laid-Open No. 10-159487
[0008]
[Problems to be solved by the invention]
Most pipe rods that have been constructed by the above-described propulsion method have a diameter of about 3 m or less. This is due to the fact that transportation becomes difficult when the diameter of the pipe body constructed at the factory and transported to the site exceeds 3 m. However, with the widespread use of common grooves in urban areas, it has become necessary to construct large-diameter pipes with the propulsion method.
[0009]
In general, large-diameter pipes or tunnels in urban areas are often constructed by a shield method, and in this shield method, a lining body, that is, a pipe body, is formed by combining a plurality of segments in the circumferential direction. However, in the shield method, the segments are assembled and built just behind the face that is being excavated. And the tube does not move. For this reason, it is comparatively easy to ensure the water stoppage for preventing the inflow of groundwater at the junction of the segments.
[0010]
On the other hand, in the propulsion method, the tube body is strongly pushed in the axial direction, a large stress is generated, and the tube body moves in the axial direction of the pipe rod. And in a curve part, a gap | interval will arise between each connected pipe body, or this clearance gap will lose | disappear. For this reason, in the connection part of an axial direction, the specific water stop structure as described in the said patent document is needed. And when a pipe is constructed by assembling a plurality of segments in the circumferential direction, it has been considered that the joint between the segments is required to be water-tight, and it is difficult to ensure water-stopping during construction.
[0011]
The invention according to the present application has been made in view of the circumstances as described above, and its purpose is to promote a structure capable of constructing a large-diameter underground conduit and maintaining a sufficient water-stopping property. The present invention provides a connection method for a tubular body that can be suitably used in the construction method and this construction method.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is to push a propulsion pipe as a lining body of an underground pipe line into the ground in the direction of its central axis, and sequentially push a predetermined length of the pipe body behind the extrusion. The pipe body is formed by assembling a concrete segment divided into a plurality of parts in the circumferential direction, and when the segment is manufactured, A steel collar that surrounds a connecting portion with an adjacent pipe body from the outside is fixed to the rear end along the circumferential direction of the segment, and the steel collar is interposed between the segment and the steel collar. When the first water-stopping material is inserted in the circumferential direction and the segments are assembled into a tubular body, the steel collar is joined in a tubular shape, and the first water-stopping material in the circumferential direction is joined. Over the entire circumference of the tube A second water-stopping material is inserted between the segments along the end surface parallel to the propulsion direction of the tube, and the second water-stopping material When the tube body is joined in the propulsion direction, the front end of another tube body that is joined to the inside of the steel collar that is tubular is inserted. Then, a third water-stopping material having a ring shape is interposed between the outer peripheral surface in the vicinity of the front end of the tubular body to be joined and the inner peripheral surface of the tubular steel collar, and the tubular body Provided is a propulsion method in which a second water stop material arranged along a propulsion direction is made continuous with the ring-shaped third water stop material.
[0013]
In this propulsion method, pipes of a predetermined length that are sequentially connected are formed by assembling a plurality of segments. Therefore, even if the pipe diameter is large, each segment manufactured at the factory can be easily put on the site. Can be transported. A large-diameter underground conduit can be constructed by connecting the assembled tubular bodies and pushing them into the ground.
[0014]
Moreover, since the 2nd water stop material is inserted in the center axis direction of a pipe body at the junction part when assembling a segment to make a pipe body, the high water stop at a junction part is maintained, and it is under construction and Even after the completion of construction, it is possible to prevent water from entering this portion.
Further, the tubular body connected in the propulsion direction is provided with a steel collar so as to surround the outside of the connecting portion, and the first water stop is also provided in the circumferential direction between the steel collar and the concrete tubular body. Since the material and the third water-stopping material are arranged, water-stopping is ensured at the connection portion under construction. In other words, there is a possibility that water leakage may occur along the inner peripheral surface of the steel collar even if both are in close contact between the steel collar and the concrete tube to which the steel collar is fixed. Since the 1st water stop material is arrange | positioned, the inundation along the inner surface of steel collars is prevented. In addition, since a ring-shaped water-stopping material is interposed between the front portion of the tubular body and the steel collar into which the tubular body is inserted, it is between the concrete tubular body connected to the steel collar. Waterstop is also maintained.
And the 1st water stop material and the 3rd water stop material which each arrange | positioned in the circumferential direction are the back part and the front edge part of the 2nd water stop material inserted along the junction part which assembled the segment, respectively. Therefore, it is possible to maintain a high water-stopping property at both ends of the joint portion of the segment.
[0015]
The invention according to claim 2 is the propulsion method according to claim 1, wherein when the segments are assembled into a tubular body, the second water stop material inserted between the segments is disposed near the front end of the tubular body. Arranged so as to be exposed on the outer peripheral surface, and when the tubular body is joined in the propulsion direction, the ring-shaped third water-stopping material is attached to the exposed portion of the second water-stopping material and closely attached It is.
[0016]
In this propulsion method, after assembling the segments into a pipe body, a third water-stop material in the form of a ring is attached near the front end, so that the third water-stop material is exposed on the outer peripheral surface of the pipe body. The second water-stopping material is in close contact with each other and both can be made continuous. Therefore, it is possible to easily ensure water-stopping at the front end of the segment joint portion.
[0017]
The invention according to claim 3 is the propulsion method according to claim 1, wherein when the segments are assembled into a tubular body, prestress is introduced in the circumferential direction by a tension material disposed in the concrete of the segments, Thereafter, the steel collar is joined by welding so as to be continuous in the circumferential direction.
[0018]
In this propulsion method, the concrete segments are assembled by introducing circumferential prestress, so that the end faces of the segments are in close contact with each other and firmly integrated. Moreover, since the 2nd water stop material is inserted between these end surfaces, the adhesiveness of this 2nd water stop material and concrete also becomes favorable, and high water stop property is ensured.
Further, since the steel collar is joined by welding, it is possible to reliably obtain the water stoppage of the joint portion.
[0019]
The invention according to claim 4 is the propulsion method according to claim 3, wherein when the segment is manufactured, a gap is provided between the inner peripheral surface of the joint portion of the steel collar and the concrete of the segment, After joining the steel collar by welding, the first water-stopping material arranged in the circumferential direction is continuous over the entire circumference by filling the gap with a filler having water-stopping properties.
[0020]
Generally, there are many water-stopping materials that are easily damaged by heat, and when welding a steel collar, the first water-stopping material placed in close contact with the steel collar is damaged by heating during welding. Can be considered. However, in this propulsion method, welding is performed in a state where a gap is provided inside the joint portion of the steel collar. Then, since the filler is filled after the joining of the steel collar by welding is completed, the first water-stopping material is cut out at this portion, and the second water-stopping material is continued in the circumferential direction with the filler. Can be. Therefore, the water stop material can be secured without being affected by heat caused by welding and causing defects.
[0021]
The invention according to claim 5 is a connection structure for a tubular body for a propulsion method that is sequentially connected in the direction of the central axis and is pushed into the ground to become a covering body of the underground pipe line. It is formed by assembling concrete segments that are divided into a plurality of directions, and at the rear end in the propulsion direction of the tubular body, it is made of tubular steel that surrounds the connection portion with other tubular bodies from the outside. The collar protrudes partially and is fixed, and a first water stop that is circumferentially continuous over the entire circumference between the tubular steel collar and the concrete tube to which the steel collar is fixed. A material is inserted, and a second water-stopping material is inserted along the propulsion direction of the tube at the joint portion of the plurality of segments constituting the tube, and the first water-stopping material and the first water-stopping material The water stop material of 2 is continuous, and the front part of the other tubular body to be connected is made of the steel collar. A tubular body for a propulsion method, which is inserted inside the protruding portion, and a ring-shaped third water stop material is interposed between the outer peripheral surface of the tubular body and the inner peripheral surface of the steel collar A connection structure is provided.
[0022]
In this connection structure, the pipe body connected in the propulsion direction is provided with a steel collar so as to surround the outside of the connection portion, and there is no circumference between the steel collar and the concrete pipe body. Since the 1st water stop material and the 3rd water stop material are arrange | positioned in the direction, the water stop at the connection part in construction is ensured.
In addition, a second water-stopping material is inserted in the central axis direction of the tubular body at the joint portion when the segments are assembled into a tubular body, and high water-stopping performance at the joint portion is maintained. Since the two water-stopping materials are continuous with the first water-stopping material and the third water-stopping material arranged in the circumferential direction, both ends of the tubular body to be joined even during construction and after completion of construction It is possible to prevent water from entering from the segment joint in the vicinity.
[0023]
The invention according to claim 6 is the connection structure according to claim 5, wherein the second water stop material inserted between the segments is arranged to be exposed to the outer peripheral surface in the vicinity of the front end of the tubular body. The ring-shaped third waterstop material is attached to and closely adhered to the exposed portion of the second waterstop material.
[0024]
In this connection structure, the ring-shaped third water-stopping material attached near the front end of the tube is in close contact with the second water-stopping material exposed on the outer peripheral surface of the tube, and both are continuous. It has become. Therefore, the third water-stopping material in the form of a ring maintains water-stopping between the concrete tube and the steel collar, and also maintains high water-stopping at the front end of the joining position of the segments. Is done.
[0025]
The invention according to claim 7 is the connection structure according to claim 5, wherein the steel collar is connected in a tubular shape by welding at the time of assembling the segment, and from the concrete to which the steel collar is attached. The rear end of the tubular body is provided with a gap between the inner peripheral surface in the vicinity of the connecting portion by welding of the steel collar and the tubular body made of concrete, and the steel collar is circumferentially welded. It is assumed that the first water-stopping material arranged in the circumferential direction is continuous over the entire circumference by the filler having the water-stopping property filled in the gap after being joined to the gap.
[0026]
In this connection structure, after joining by welding the steel collar, the first water-stopping material arranged in the circumferential direction in close contact with the steel collar by the filler filled inside is continuous in the circumferential direction. It becomes. For this reason, the water-stop material in the circumferential direction surely continues even at the portion where the segments are joined in the circumferential direction, and is in close contact with the steel collar. Therefore, the water-stopping property between the steel collar and the concrete tube to which the steel collar is fixed is well maintained. Moreover, since the 1st water stop material of this circumferential direction is also continuing with the 2nd water stop material inserted in the junction part of a segment, the water stop in the back end vicinity of a segment junction part is also ensured. .
In addition, between the 1st water stop material of the circumferential direction and the 2nd water stop material inserted by the segment junction part shall be connected by the filler with which the steel collar was welded and joined. Is desirable. As a result, the continuity between the first water-stopping material and the second water-stopping material is also reliably maintained without being affected by heat from welding.
[0027]
The invention according to claim 8 is the connection structure according to claim 5, wherein the steel collar is connected in a tubular shape by welding at the time of assembling the segment, and the inner side from the inner peripheral surface of the steel collar. The first water-stopping material disposed in the circumferential direction is embedded in the concrete in close contact with the embedded portion. And
[0028]
In this connection structure, since the first waterstop material is in close contact with the portion protruding inward from the tubular portion of the steel collar, when the segments are assembled and joined, the tubular portion of the steel collar is welded. Even if connected, it is not easily affected by the heat. Therefore, the first water-stopping material continuous in the circumferential direction at the joint portion of the segment is not damaged, and the water-stopping property is reliably maintained.
[0029]
The invention according to claim 9 is the connection structure according to claim 8, wherein the concrete is cut out between the connecting portion by welding of the steel collar and the concrete to which the steel collar is fixed. An open space is provided on the outer peripheral surface side of the body, and the steel collar is joined in the circumferential direction by welding, and then the circumferentially disposed filler is filled with the water-stopper filled in the space. It is assumed that the first water stop material and the steel collar are continuous.
[0030]
In this connection structure, since the first water stop material is disposed at a position away from the tubular portion of the steel collar, the first water stop material and the tubular portion of the steel collar are joined at the joint portion of the segment. In the middle, water may enter along the joint surfaces of the segments. However, since the steel collar and the first water-stopping material are continuous by the filler filled in the gap provided between the steel collar and the concrete, the water from this portion is Is prevented and water-stopping is maintained.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention according to the present application will be described with reference to the drawings.
FIG. 1 is a schematic explanatory diagram showing an outline of a propulsion method according to an embodiment of the invention described in claims 1 to 4.
In this propulsion method, a shaft 1 is provided at a position where propulsion is started, and a tube (propulsion tube 2) continuous in a substantially horizontal direction is pushed from one wall surface of the shaft to be propelled into the ground. A reaction force wall 3 is provided on the opposite wall surface of the shaft 1, and the pipe is pushed forward by a jack 4 interposed between the reaction force wall 3 and the rear end of the propulsion pipe 2. Then, the pipe body 20 having a predetermined length is sequentially added between the rear end of the pushed-in pipe 2 and the jack 4 and pushed into a predetermined distance to form a pipe line.
[0032]
The vertical shaft 1 is held so that the wall surface is not collapsed by the retaining ring 11 and the bellows 12 and the like, and an opening is provided on the wall surface, and the propelling pipe 2 is pushed out from here in the horizontal direction. The concrete reaction force wall 3 formed on the opposite wall surface is provided with an extrusion jack 4 via a jack stand 5, and thrust is applied to the propulsion pipe 2 via the straddle 6 by this jack 4. Since the stroke of the jack 4 is limited, the straddle 6 is inserted between the rear end of the pipe 2 and the jack 4 as the propulsion pipe 2 moves, and transmits the thrust of the jack 4 to the pipe.
[0033]
A portal crane 7 is provided above the vertical shaft 1, and a pipe 20 having a predetermined length is lifted and carried into the vertical shaft 1. Also, the earth and sand 8 excavated from the premises along with the propulsion of the pipe 2 is discharged using the portal crane 7.
[0034]
The propulsion pipe 2 to be pushed into the ground is made of concrete, and a pipe body 20 having a predetermined length is sequentially connected to the rear end of the pipe 2 already pushed in as propulsion proceeds. 2 is a side view and a cross-sectional view of the tubular body 20, and FIG. 3 is a vertical cross-sectional view.
A steel collar 21 is provided at the rear end of each tubular body 20, and the front portion 22 of the tubular body 20a connected to the rear is inserted inside the steel collar 21b fixed to the tubular body 20b at the front. The steel collar 21b covers the joint from the outside. Then, between the steel collar 21b and the concrete pipe body 20b to which the steel collar 21b is fixed, the first water stop material 23 is continuously provided in the circumferential direction so as to be in close contact with the steel collar 21b when the segment is manufactured. Thus, the groundwater is prevented from entering from between the steel collar 21 and the concrete pipe body 20. Further, a ring-shaped third water stop material 25 is inserted between the inner peripheral surface of the steel collar 21b and the outer peripheral surface of the succeeding tube body 20a inserted inside, and the tube body is inserted between these. Prevent water from entering inside.
In addition, the code | symbol 33 shown in FIG. 3 shows the steel bar welded along the circumferential direction of the steel collar 21 in order to integrate the steel collar 21 firmly with concrete.
[0035]
The tube 20 is manufactured in a factory, and as shown in FIG. 2, the tube is divided into two in the axial direction and assembled into a tubular shape on site. Even if the divided segment 20 ′ has a large diameter, it can be conveyed by the trailer 9 or the like as shown in FIG. At the site, as shown in FIG. 5, one segment 20′a to be combined is fixed and supported, and the other segment 20′b is joined from above, and tightened with a PC tendon 27 in the circumferential direction to be firmly integrated. To do. At this time, the 2nd water stop material 24 is inserted between the joint surfaces of both segments 20'a and 20'b along the axial direction of a pipe. Further, the shear key 26 is attached so as to penetrate both the segments 20′a and 20′b to be joined. The PC tension member 27 is inserted into a duct formed in advance in the segment 20 at the site, and after introducing a tension force with a jack, the PC tension member 27 is fixed to the anchor 28 fixed to the outer peripheral surface side of the segment 20.
[0036]
Next, the production of the segment 20 ′ constituting the tube body 20 and the structure and method of assembling them into a tubular shape and connecting them in the propulsion direction will be described. In addition, this connection structure of a tubular body is an embodiment of the invention described in each of claims 5 to 7.
The steel collar 21 is manufactured by dividing the entire circumference in half according to the divided segments, and is arranged so as to be continuous with the formwork. And the 1st water stop material 23 closely_contact | adhered to the internal peripheral surface of a steel collar and arrange | positioning in the circumferential direction is arrange | positioned, and this water stop material is embedded and it is united with this halved steel collar. Concrete is placed on the concrete to form a concrete segment 20 '. The first water blocking material 23 is in close contact with the steel collar 21 and the concrete and blocks water from entering between them, and a flexible synthetic resin, rubber, or the like can be used.
[0037]
FIG. 6 is an end view showing the joining surface of the segment 20 ′ and a view of the joining portion of the segment 20 ′ as seen from the outside. A gap 31 is provided between the steel collar 21 and the concrete at the circumferential end of the halved segment 20 ′, and the first water stop material 23 arranged in the circumferential direction is the gap 31. Leave exposed inside. In addition, a groove 32 is formed in parallel to the central axis of the tube body 20 ′ on the joint surface when the segment 20 ′ is assembled into a tubular shape, and the second water stop material 24 is adhered in the groove 32. Insert so as to be sandwiched between the segments to be joined. The second water stop material 24 is disposed so as to be continuous toward the outer peripheral surface at the rear end portion of the pipe body 20, and is placed in the gap 31 formed between the steel collar 21 and the concrete. Position it so that it is exposed. Further, at the front end portion 22, the second water stop material 24 is arranged so as to continue toward the outer peripheral surface, and when the segment is assembled, the second water stop material 24 is exposed to the outer peripheral surface. Make it protrude slightly.
[0038]
When the two halved segments 20′a and 20′b are assembled into a tubular shape and integrated by introducing prestress, the steel collar 21 is surrounded at the joint of the segment 20 ′ as shown in FIG. The end surfaces in the direction are abutted, and both ends thereof are joined by welding, and the steel collar 21 is continuous in a tubular shape. At this time, a gap 31 is provided between the inside of the joint portion and the concrete, and the second water stop material disposed along the joint surface of the first water stop material 23 and the segment 20 ′ in the circumferential direction. Since the steel collar 21 is joined from the outside by welding, the water-stopping materials 23 and 24 are not affected by the heat of welding. In addition, since a backup steel plate material can be inserted into the gap 31 during welding and brought into contact with the back surface of the steel collar, welding can be performed under favorable conditions.
[0039]
When the joining of the steel collar 21 by welding is completed, the filler is filled in the space 31 inside the steel collar 21. This filler has fluidity that can be filled to every corner of the gap when filling, and has a certain degree of flexibility after filling, but it can maintain the water-stopping property of this filling part. Use. The first water stop material 23 arranged in the circumferential direction by filling the gap with the filler has water stoppage continuously in the circumferential direction, and further, the first water stop material 23 and the segment 20 ′. The 2nd water stop material 24 inserted between these joining surfaces becomes continuous. This ensures water-stopping at the rear end of the tubular body.
[0040]
On the other hand, in the vicinity of the front end of the tubular body 20, a third water stop material 25 in the form of a rubber ring is attached. And the 2nd water stop material 24 is wound on the part exposed to the outer peripheral surface of the pipe body 20, and both the water stop materials 25 and 24 are stuck. The third water blocking material 25 is inserted inside the steel collar 21b of the front tubular body 20b to be joined, and is in contact with the inner peripheral surface. As a result, the water stoppage between the steel collars 21b of the adjacent tube bodies 20b is ensured, and the waterstop at the front end of the joint portion of the segment is also ensured. Further, the third water blocking material 25 can slide between the inner peripheral surface of the steel collar 21b, and even if relative movement occurs in the axial direction at the joint portion of the tubular body 20, the third water blocking material 25 can be stopped. Aqueousness is maintained.
[0041]
Next, a connecting structure of another embodiment of the invention according to claim 8 or claim 9, which is another pipe joint structure that can be used in the propulsion method shown in FIG. 1, will be described.
FIG. 8 is a longitudinal cross-sectional view of a tube used in this connection structure, and FIG. 9 is a schematic view showing a joining end surface of a segment constituting this tube. 10 is a cross-sectional view taken along the line AA shown in FIG. 9, and FIG. 11 is a cross-sectional view taken along the line BB shown in FIG.
[0042]
Similar to the tube body 20 shown in FIGS. 2 and 3, the tube body 40 is formed by combining two segments, and a steel collar 41 is fixed to a rear end portion. The steel collar 41 has an embedded portion 51 that protrudes inside the tubular body 40 and is embedded in concrete. The embedded portion 51 continues in the circumferential direction and protrudes substantially perpendicularly to the inner circumferential surface of the steel collar 41, and the first water stop material 43 is in close contact with the front surface in the propulsion direction, and is continuous in the circumferential direction. is doing. Therefore, even if groundwater enters between the concrete and the steel collar 41, it is shielded by the first water blocking material 43, thereby preventing water leakage to the inside of the tubular body.
[0043]
As shown in FIG. 9, a groove 52 is formed in the axial direction of the tube body 40 on the end surface in the circumferential direction of the segment 40 ′ constituting the tube body 40 having such a structure, and a second water stop is formed in this portion. A material 44 is arranged and inserted so as to be sandwiched between two segments. As shown in FIG. 11, the second water stop material 44 is in contact with the first water stop material 43 arranged in the circumferential direction as shown in FIG. 11, and is continuous. Further, the front end portion is exposed to the outer peripheral surface side, and is in contact with the ring-shaped third water stop material 45 attached to the outer peripheral surface at the front portion 42 of the tubular body 40. Thereby, the water stop in the both ends in the joint surface of a segment is ensured.
[0044]
At the end in the circumferential direction of the segment, as shown in FIG. 10, the steel collar 41 is joined in a tubular shape by welding, and inside the steel collar 41 so as to be able to perform welding joint well, A counter plate 53 is inserted. Moreover, as shown in FIG. 12, it is desirable to provide a notch 54 that opens to the outer peripheral surface of the concrete tube in the front portion of the steel collar 41 in the propulsion direction. The notch 54 is continuous with the front surface of the embedded portion 51, the first water stop material 43, and the second water stop material 44 inside the steel collar 41. The notch 54 is filled with a flexible filler after the steel collar 41 is joined by welding, and the gap between the steel collar 41 and the first water-stopping material 43 is a water-proof filler. It will be continuous. Thereby, although the embedding part 51 is not welded by the junction part of a segment, it can prevent that groundwater penetrate | invades into a pipe body between the steel collar 41 and the 1st water stop material 43. FIG.
[0045]
The tubular body 40 assembled in this manner is connected to the rear end of the propulsion pipe in accordance with the propulsion similarly to the tubular body 20 shown in FIGS. 2 to 7, and as shown in FIG. The front portion 42 of the succeeding tube body 40a is inserted inside the steel collar 41 provided at the rear end portion of the tube body 40. The inner peripheral surface of the steel collar 41 is in close contact with the ring-shaped third water stop material 45 attached to the front portion of the succeeding tube body 40a, and the third water stop material 45 slides in the propulsion direction. It becomes possible to move. Therefore, even when both the connected pipe bodies 40a and 40b are displaced relative to each other in the central axis direction, the water stoppage is maintained.
[0046]
【The invention's effect】
As described above, in the propulsion method according to the present invention and the connection structure of the pipe used in the present invention, the pipe is formed by assembling a plurality of segments in the circumferential direction, and each segment can be easily manufactured at the factory. Can be brought to the site. Therefore, an underground conduit can be constructed using a large-diameter pipe. Moreover, the 2nd water stop material is inserted along the joint surface of a propulsion direction in the junction part of a segment, These both ends are the 1st water stop material and 3rd water stop material which continued in the circumferential direction. Since it becomes a continuous thing, high water-stopping property is obtained in the junction part of a segment, and the connection part of a tubular body.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an outline of a propulsion method according to an embodiment of the present invention.
FIG. 2 is a side view and a cross-sectional view of a tubular body used in the propulsion method according to the present invention.
FIG. 3 is a longitudinal sectional view of the tubular body shown in FIG. 2 and a portion connecting the tubular body in the axial direction.
4 is a schematic view showing a transportation state of segments constituting the tubular body shown in FIG. 2. FIG.
FIG. 5 is a schematic view showing a state in which the tubular body shown in FIG. 2 is assembled.
6 is a schematic view showing a joining surface of segments constituting the tubular body shown in FIG. 2 and a view of the joining portion as seen from the outside.
7 is a cross-sectional view of the segment joint portion in the vicinity of the rear end of the tubular body shown in FIG. 2. FIG.
FIG. 8 is a longitudinal sectional view showing another example of a tubular body that can be used in the propulsion method shown in FIG. 1;
9 is a schematic view showing a joining end face of a segment constituting the tubular body shown in FIG.
10 is a cross-sectional view taken along line AA shown in FIG.
11 is a cross-sectional view taken along line BB shown in FIG.
12 is a schematic diagram showing an end surface near the rear end of the segment constituting the tubular body shown in FIG. 8, and a schematic diagram showing an outer peripheral surface near the rear end at the joining portion of the segment.
[Explanation of symbols]
1 shaft
2 propulsion pipe
3 reaction wall
4 Jack
5 Jack stand
6 struts
7 Portal crane
8 earth and sand
9 Trailer
11 Yamazume
12 Raise the stomach
20, 40 tube
20 ', 40' segments constituting the tube
21,41 Steel collar
22, 42 The front part of the tube
23, 43 First water stop material
24, 44 Second water stop material
25, 45 Third water stop material
26 Shear key
27 PC tendons
28 Anchor
31 gap
32 Steel bar welded circumferentially
33 groove
51 Embedded part
52 Groove
53 Address plate
54 Notch

Claims

A propulsion method that extrudes the propulsion pipe that becomes the lining body of the underground pipe line into the ground in the direction of its central axis, and repeats the extruding operation by sequentially connecting a predetermined length of the pipe body to the rear side of the extrusion,
The tubular body is formed by assembling a concrete segment divided into a plurality in the circumferential direction,
At the time of manufacturing the segment, a steel collar that surrounds a connecting portion with an adjacent tube body from the outside is fixed to the rear end in the propelling direction of the tube body along the circumferential direction of the segment. The first water-stopping material is inserted in the circumferential direction in close contact with the steel collar,
When assembling the segment into a tubular body, the steel collar is joined in a tubular shape, and the first water stop material in the circumferential direction is continuous over the entire circumference of the tubular body. The first water-stopping material is disposed in a circumferential direction with the second water-stopping material by inserting a second water-stopping material between both segments along an end surface parallel to the propulsion direction of the pipe body. And
When joining the tubular body in the propulsion direction, the front end of another tubular body to be joined is inserted inside the tubular steel collar that is tubular, the outer peripheral surface near the forward end of the joined tubular body, A third water-stopping material in a ring shape is interposed between the inner peripheral surface of the steel collar and the second water-stopping material disposed along the propulsion direction of the tubular body is a ring shape. A propulsion method characterized in that it is made continuous with the third water-stopping material.

When assembling the segments into a tubular body, the second water blocking material inserted between the segments is disposed so as to be exposed on the outer peripheral surface near the front end of the tubular body,
The ring-shaped third waterstop material is attached to an exposed portion of the second waterstop material and is brought into close contact with the pipe body when joined in the propulsion direction. Promotion method.

When assembling the segments into a tube,
Introducing prestress in the circumferential direction by tendons placed in the concrete of the segment,
Thereafter, the steel collar is joined by welding so as to be continuous in the circumferential direction.

During the production of the segment, a gap is provided between the inner peripheral surface of the joint portion of the steel collar and the concrete of the segment,
After joining the steel collar by welding, the first water-stopping material arranged in the circumferential direction is made continuous over the entire circumference by filling the gap with a filler having water-stopping properties. The propulsion method according to claim 3, wherein the propulsion method is characterized.

It is connected in the direction of the central axis, and is connected to the pipe for propulsion method that is pushed into the ground and becomes the lining body of the underground conduit,
The tubular body is formed by assembling a concrete segment divided into a plurality in the circumferential direction,
A tubular steel collar surrounding the connecting portion with the other tubular body from the outside is fixed to the rear end portion in the propelling direction of the tubular body, protruding partly,
Between the tubular steel collar and the concrete tube to which the steel collar is fixed, a first water stop material that is continuous in the circumferential direction is inserted over the entire circumference,
A second water stop material is inserted along the propulsion direction of the pipe body at the joint portion of the plurality of segments constituting the pipe body,
The first water stop material and the second water stop material are continuous,
The front portion of the other tubular body to be connected is inserted inside the protruding portion of the steel collar, and a ring-shaped third portion is interposed between the outer peripheral surface of the tubular body and the inner peripheral surface of the steel collar. A structure for connecting a tubular body for a propulsion method, characterized in that a water-stopping material is inserted.

The second water blocking material inserted between the segments is disposed so as to be exposed to the outer peripheral surface near the front end of the tubular body,
6. The structure for connecting a tubular body for a propulsion method according to claim 5, wherein the ring-shaped third water stop material is attached to and closely contacts the exposed portion of the second water stop material.

The steel collar is connected in a tubular shape by welding when the segments are assembled,
The rear end of the tube made of concrete to which the steel collar is attached is provided with a gap between the inner peripheral surface in the vicinity of the connecting portion by welding of the steel collar and the tube made of concrete. ,
After the steel collar is joined in the circumferential direction by welding, the first water-stopping material arranged in the circumferential direction is continuous over the entire circumference by the filler having the water-stopper filled in the gap. The tube connection structure for a propulsion method according to claim 5, wherein:

The steel collar is connected in a tubular shape by welding at the time of assembling the segments. The steel collar protrudes from the inner peripheral surface of the steel collar into the inner concrete and has a plate-like embedded portion continuous in the circumferential direction. And
The connection structure for a tubular body for a propulsion method according to claim 5, wherein the first water stop material arranged in the circumferential direction is embedded in concrete in close contact with the embedded portion.

Between the connecting portion by welding of the steel collar and the concrete to which the steel collar is fixed, a gap is provided in the outer peripheral surface side of the tubular body by cutting out the concrete,
The steel collar is continuously connected to the first water-stop material disposed in the circumferential direction by a filler having water-stopper filled in the gap after the steel collar is joined in the circumferential direction by welding. The structure for connecting a tubular body for a propulsion method according to claim 8, wherein: