JP3677405B2

JP3677405B2 - Flexible joint for connecting tunnel hollow connectors

Info

Publication number: JP3677405B2
Application number: JP00726199A
Authority: JP
Inventors: 忠利小澤; 達也永井; 敦香川; 隆司北岡
Original assignee: Obayashi Corp
Current assignee: Obayashi Corp
Priority date: 1999-01-14
Filing date: 1999-01-14
Publication date: 2005-08-03
Anticipated expiration: 2019-01-14
Also published as: JP2000204875A

Description

【０００１】
【発明の属する技術分野】
本発明は、シールドトンネル等のトンネルと割込立坑（中間立坑）等トンネルに接続される中空接続体を接続するための可撓継手に関する。
【０００２】
【従来の技術】
長距離シールドトンネル等の横坑において発進立坑と到達立坑との間に人孔等の立坑を設ける場合シールドトンネル完成後に上部分からシールド間を割込んで枝付けする割込立坑工法がある。このようにシールドトンネルに割込立坑（中間立坑、シャフトとも呼ばれる）を接続する場合、割込立坑とシールドトンネルとの相対変位を許容し、地盤の不等沈下や地震による地盤変動等によって生ずる応力を緩和する構成とすることが望ましい。
【０００３】
従来この目的で開発された構成として、特開平８−４１９２１号公報記載の可撓継手がある。この可撓継手は、ゴム製の可撓部材を１対の受圧鉄板で厚さ方向に挟み、割込立坑の横断面と対応する環を周方向に複数に分割した形状に形成された複数の分割ピースがそれぞれ端面を突き合わせた状態で結合されて割込立坑の横断面と対応する環状となって、割込立坑とトンネルの一部である立坑基部との間に介設されるように構成されたものである。この可撓継手においては、ゴム製可撓部材が割込立坑の荷重を担った状態で地震時に生じる割込立坑の曲げおよび水平変位に追従変位しかつ止水を維持する。
【０００４】
【発明が解決しようとする課題】
上記従来の可撓継手においては、可撓部材は施工現場において各分割ピースをボルトで接続して環状に形成するので止水性の確保に手間がかかり、また可撓部材にはアンカーボルトを設けてあるので、施工時に型枠に個々に固定する必要があり施工の手間がかかるという問題がある。また止水板を可撓部材と別体に設けなければならないので、止水板の固定、型枠の加工等複雑な施工を必要とする。さらに、可撓部材の上下面に設けられた受圧鉄板も分割品であり、それぞれを相互接続するための継手部を有しているので高価になる上施工の際、継手部の接続に手間がかかるという問題がある。
【０００５】
したがって、上記従来の可撓継手は全体として構造が複雑で高価となる上に施工にも非常に手間がかかるという問題がある。
【０００６】
また、中空接続体とトンネル等の接続ばかりでなく、立坑本体の上部が軟弱地盤中に位置し下部が岩盤中に位置する等上部と下部とで異なる地盤構造に対処するため、立坑を上部と下部とに分割し、両部分を可撓継手で接続する必要が生じる場合もあるが、この場合にも上記と同様の問題が生じる。
【０００７】
本発明は、上記の事情にかんがみなされたものであって、より簡単な構造で施工の手間も省け、しかも割込立坑等の中空接続体とトンネルとの相対変位または上下に分割された立坑の上部と下部との相対変位を許容し、地盤の不等沈下や地震による地盤変動等によって生じる応力を緩和することが充分に可能なトンネル中空接続体等接続用可撓継手を提供しようとするものである。
【０００８】
【課題を解決するための手段】
上記目的を達成するトンネル中空接続体接続用可撓継手は、トンネルに割込立坑等の中空接続体を接続するための可撓継手であって、該中空接続体の周方向に延長するようにして該トンネルの中空接続体接続基部と該中空接続体の各接続端面との間に介装されたゴム・合成樹脂等からなる環状の可撓板と、該トンネルの中空接続体接続基部および該中空接続体の各接続端面と平行な該可撓板の両面から所定の角度をなして延長するようにして該可撓板と一体的に環状に形成され、一端側が該中空接続体の壁体端部に、他端側が該トンネルに埋設された伸縮性止水板と、該中空接続体の軸方向に延長するようにして一端側が該中空接続体の壁体端部に、他端側が該トンネルに配置された棒状部材とを備えることを特徴とする。
【０００９】
ここで、「中空接続体」とはトンネルとの接続角度は直交方向を標準としているが斜めに接続される場合も含む。またトンネルの上部に接続される割込立坑のほか発進立坑、到達立坑やトンネルに対し水平方向に配置される坑も含むものである。
【００１０】
本発明によれば、トンネルと該トンネルの中空接続体接続基部に接続された中空接続体との間に相対変位が生じるような地盤の不等沈下や地震による地盤変動が生じたとき、可撓継手は該相対変位に追従しまたはこれに抵抗することにより接合部の破壊を防止かつ止水を維持する。
【００１１】
すなわち、中空接続体とトンネルの中空接続体接続基部が相互に接近する方向に相対変位が生じた場合すなわち圧縮力が作用する場合は、可撓板が相対変位に追従して圧縮変形することによってこの圧縮力を吸収する。逆に中空接続体とトンネルの中空接続体接続基部が相互に離間する方向に相対変位が生じた場合すなわち引張り力が作用する場合は、伸縮性止水板が相対変位に追従して伸長することによってこの引張り力を吸収する。また中空接続体がトンネルの中空接続体接続基部に対して回転するように相対変位が生じた場合は圧縮側および引張側でそれぞれ上記と同様の作用が生じる。
【００１２】
また、中空接続体およびトンネルの中空接続体接続基部がトンネル軸方向に相対変位を生じさせるような外力すなわちせん断力が作用した場合は、棒状部材が、このせん断力を支持しせん断力による中空接続体とトンネルの中空接続体接続基部との相対変形を防止する。
【００１３】
本発明の一側面において、該中空接続体の壁体端部の該棒状部材が配置された部分には、該棒状部材の周面および端面と所定の間隔をおいて該棒状部材を覆う袋状のスリーブが設けられている。
【００１４】
この構成により、中空接続体とトンネルの中空接続体接続基部との間に圧縮力が作用した場合は中空体接続体の壁体端部の棒状部材が配置された部分はその頂面とスリーブの頂部内面との間隔内においてスリーブ頂部内面に当接する方向にスリーブ内を摺動することによって棒状部材と中空接続体の壁体との間に破損が生じることを防止することができる。
【００１５】
また、中空接続体とトンネルの中空接続体接続基部の間に引張力が作用した場合は棒状部材の上記部分はスリーブから抜ける方向にスリーブ内を摺動することによって同様に棒状部材と中空接続体の壁体との間に破損が生じることを防止することができる。
【００１６】
さらに、中空接続体とトンネルの中空接続体接続基部にせん断力が作用した場合は、棒状部材の上記部分はその周面とスリーブ内周面との間の間隔内において棒状部材の径方向に移動することにより、その範囲内で、中空接続体とトンネルの中空接続体接続基部の間のせん断力による相対変位を吸収することができる。
【００１７】
さらに、本発明によれば、上部と下部とに分割された立坑の該上部と下部とを相互に接続するための可撓継手であって、該立坑の周方向に延長するようにして該立坑上部と該立坑下部の各接続端面との間に介装されたゴム・合成樹脂等からなる環状の可撓板と、該立坑上部および該立坑下部の各接続端面と平行な該可撓板の両面から所定の角度をなして延長するようにして該可撓板と一体的に環状に形成され、一端側が該立坑上部の壁体下端部に、他端側が該立坑下部の壁体上端部に埋設された伸縮性止水板と、該立坑の軸方向に延長するようにして一端側が該立坑上部の壁体下端部に、他端側が該立坑下部の壁体上端部に配置された棒状部材とを備えることを特徴とする立坑接続用可撓継手が提供される。この可撓継手においても、該立坑上部の壁体下端部の該棒状部材が配置された部分には、該棒状部材の周面および端面と所定の間隔をおいて該棒状部材を覆う袋状のスリーブが設けることができる。
【００１８】
【発明の実施の形態】
以下添付図面を参照して本発明の実施の形態について説明する。
【００１９】
図１は本発明の１実施形態を示す概略断面図、図２は図１中のＡ部分の拡大断面図、図３は図１中Ｂ−Ｂ矢視図である。
【００２０】
この実施形態において本発明の可撓継手１は、円筒状のシールドトンネル２とその上部に設けられた横断面が楕円リング状の割込立坑３との接続に用いられている。
【００２１】
可撓継手１はトンネル２の上部に突設された横断面が楕円リングの立坑基部７の接続端面７ａ（図２）とその上に設置される割込立坑３の接続端面３ａ（図２）との間に介設されるもので、可撓板４、伸縮性止水板５および棒状部材６を備えている。
【００２２】
可撓板４はゴム・合成・樹脂等可撓性を有する材料からなり、たとえば耐候性・耐熱性に優れたクロロプレンゴム等が好適である。可撓板４は所定の厚みＤと割込立坑３の壁厚の半分に近い幅を有し、割込立坑３の外周側において割込立坑３の周方向に延長するようにしてトンネル２の立坑基部７の接続端面７ａと割込立坑３の接続端面３ａとの間に介装されており、これら接続端面７ａ，３ａの形状に合致する横断面が楕円リング状の環状板状として構成されている。
【００２３】
伸縮性止水板５は、伸縮性、可撓性を有するゴム等の材料からなり、両接続端面７ａ，３ａと平行な可撓板４の両面すなわち両接続端面７ａ，３ａと全面的に接触する両面４ａ，４ｂ（図２中上下面）から所定の角度をなして延長するようにして可撓板４と一体的に環状に形成されており、止水板５の一端側は割込立坑３の壁体端部３ｂに、他端側は立坑基部７にそれぞれ埋設されている。本実施形態において、伸縮性止水板５は可撓板４の幅方向ほぼ中央部に形成されており、したがって割込立坑３の外周側および立坑基部７の外周側において横断面が楕円リング状の部材として形成されている。伸縮性止水板５の可撓板４に対する設置角度は本実施形態においては可撓板４の上下面４ａ，４ｂに対して直角であるが、斜めに設置してもよい。
【００２４】
伸縮性止水板５の両端部は止水機能を高めるために止水板の幅方向の断面において円形に膨出した膨出端部５ａとして形成されており、その外周面側は水膨張ゴム５ｂによって形成されている。
【００２５】
割込立坑の壁体端部３ｂおよび立坑基部７のほぼ中央には、図３から明らかなように、周方向に所定の間隔をおいて、複数の横断面円形の棒状部材６が、割込立坑３の軸方向に延長するようにして、一端側６ａが割込立坑３の壁体端部３ｂに、他端側６ｂがトンネル２の立坑基部７に配置されている。棒状部材としてはたとえばダウエルバーが好適である。本実施形態においては、各棒状部材６の割込立坑３の壁体端部３ｂに配置される部分６ａには、棒状部材６の周面６ｃおよび端面６ｄと所定の間隔１１および１２をおいて棒状部材６を覆う合成樹脂等からなる袋状のスリーブ８が設けられている。スリーブ８はキャップ付き円筒状に形成されている。
【００２６】
図２において、符号９は可撓板４の内周側に隣接して割込立坑３の接続端面３ａと立坑基部７の接続端面７ａとの間の内周側空間に介装された発泡ゴム等からなる環状の目地材であり、棒状部材６はこの目地材９の外周部を貫通して配置されている。また符号１０は目地材９の内周側に隣接して施されたゴム等からなる止水用の環状コーキング材である。
【００２７】
次に上記可撓継手の動作について述べる。
【００２８】
地盤の不等沈下や地震による地盤変動が生じ、割込立坑３とトンネル２（すなわち立坑基部７）が相互に接近する方向に相対変位が生じた場合は、可撓板４がこの相対変位に追従して圧縮され、圧縮力を吸収する。この時棒状部材６の部分６ａはその頂面６ｄがスリーブ頂部内面８ａに当接する方向にスリーブ８内を摺動する。したがって、棒状部材６の頂面６ｄとスリーブ頂部内面８ａとの間隔１２を適宜の値に設定しておくことにより、その範囲内において棒状部材６と割込立坑３の端部壁体３ｂとの衝突による壁体３ｂの破損が生じることを防止することができる。
【００２９】
逆に、割込立坑３とトンネル２が相互に離間する方向に相対変位が生じた場合は、伸縮性止水板５がこの相対変位に追従して伸長し引張り力を吸収するとともに止水を維持する。この時棒状部材６の部分６ａはスリーブ８から抜ける方向にスリーブ８内を摺動する。
【００３０】
割込立坑３が立坑基部７に対して回転するように相対変位が生じた場合は圧縮側および引張り側でそれぞれ上記と同様の作用が生じる。
【００３１】
また割込立坑３およびトンネル２がトンネル軸方向に相対変位を生じさせるように、せん断力が働いた場合は、棒状部材６がこのせん断力を支持し、せん断力による割込立坑３と立坑基部７との相対変形を防止する。この時棒状部材６の部分６ａはその周面６ｃとスリーブ内周面８ｂとの間の間隔１１内において棒状部材６の径方向に移動するので、この間隔１１の範囲内の比較的小さい相対変位量であれば割込立坑３と立坑基部７との間のせん断力による相対変位を吸収することができる。
【００３２】
次に、この可撓継手の施工法につき図４および図５を参照して説明する。
【００３３】
（１）可撓板４と伸縮性止水板５の環状組立体をあらかじめ工場で製造しておき施工現場に搬入する。この組立体は、例えば可撓板４に止水板５を一体成形した帯状の組立体の両端末を接合してエンドレスにすることによって製造する。
【００３４】
（２）この可撓板４と伸縮性止水板５の組立体を組立体保持用型枠１１に組込む。すなわち、図４に示すように、止水板５の膨出端部５ａに近い部分を１組のコマ１２で挾持し、可撓板４の上面４ａを型枠１１の下面に押し当てる。
【００３５】
（３）この状態で組立体保持用型枠１１を外周型枠１３に対し、位置決めし、外周型枠１３に固定する。
【００３６】
（４）棒状部材６を所定位置に固定する。
【００３７】
（５）下側内周型枠１４を組立て下部コンクリート１５を打設する。
【００３８】
（６）下部コンクリート１５を養生した後組立体保持用型枠１１および下側内周型枠１４を外し、図５に示すように、コンクリート面に目地材９を取付ける。
【００３９】
（７）棒状部材６にスリーブ８を被せる。
【００４０】
（８）コーキング用コマ１７を取付けた上側内周型枠１６を組立て、上部コンクリート１８を打設する。
【００４１】
（９）上部コンクリート１８を養生後すべての型枠を取り外し、コーキング作業を行ってコーキング材１０（図２）を形成する。
【００４２】
上記施工法によれば、可撓板４と伸縮性止水板５は一体の組立体としてあらかじめ製造されており、施工現場においてはこの組立体を型枠で保持するだけでコンクリート打設作業を行うことができるので従来の分割ピースを組立てる継手に比べて施工をきわめて簡単に行うことができる。また下部コンクリート１５打設後組立体保持用型枠１１および下側内周型枠１４を取外した際に、伸縮性止水板５はこれと一体的に形成された可撓板４によってしっかりと支持されているので、止水板５の倒れ込みが防止され、上部コンクリートを打設する際には止水板５を保持するための特別の型枠を必要とせず上部コンクリート１８の打設を容易に行うことができる。
【００４３】
上記の実施形態においては、可撓板４と伸縮性止水板５は割込立坑３の外周側に設けられているが、図６に示すように可撓板４と止水板５を割込立坑３の外周側と内周側の双方に設けてもよい。
【００４４】
また、上記の実施形態においては、伸縮性止水板５は可撓板４の中央に配置されているが、止水板５の位置はこれに限らず、たとえば図７に示すように止水板５を可撓板４の一方の端部に形成するようにしてもよい。
【００４５】
またトンネルはシールドトンネルに限らず他の構成のトンネルにも適用可能であり、またトンネルおよび中空接続体の断面形状は楕円形に限らず、円形、四角形、その他の多角形のいずれであってもよい。
【００４６】
また、本発明は、トンネルに中空接続体を接続する場合だけでなく、上下に分割された立坑本体の接続用にも適用することができる。図８は、本発明を上下２つの部分に分割された立坑の上部と下部を相互に接続するための可撓継手に適用した実施形態を示す概略断面図である。この実施形態においては、立坑２０の上部２０ａは軟弱地盤２１中に、立坑２０の下部２０ｂは岩盤２２中にそれぞれ配置されており、上部２０ａと下部２０ｂは可撓継手２３によって相互に接続されている。なお、２４は立坑下部２０ｂに接続された下水道等の暗渠を示す。可撓継手２３は、立坑２０の周方向に延長するようにして立坑上部２０ａと立坑下部２０ｂの各接続端面２０ｃ、２０ｄとの間に介装されたゴム・合成樹脂等からなる環状の可撓板と、立坑上部２０ａおよび立坑下部２０ｂの各接続端面２０ｃ、２０ｄと平行な可撓板の両面から所定の角度をなして延長するようにして可撓板と一体的に環状に形成され、一端側が立坑上部２０ａの壁体下端部２０ｅに、他端側が立坑下部２０ｂの壁体上端部２０ｆに埋設された伸縮性止水板と、立坑２０の軸方向に延長するようにして一端側が立坑上部２０ａの壁体下端部２０ｅに、他端側が立坑下部２０ｂの壁体上端部２０ｆに配置された棒状部材とを備えている。棒状部材の立坑上部２０ａの壁体下端部２０ｅに配置された部分には、棒状部材の周面および端面と所定の間隔をおいて棒状部材を覆う袋状のスリーブが設けらている。可撓板、伸縮性止水板、棒状部材および棒状部材を覆うスリーブの具体的な構成としては、図１ないし図７を参照して述べた上記各実施形態の構成を使用することができる。
【００４７】
【発明の効果】
以上述べたように、本発明によれば、環状の可撓板と環状の伸縮性止水板が一体的に形成されているので、従来の可撓継手のように可撓板が複数の分割ピースからなりまた止水板が可撓板と別体に設けられているものに比べて施工の手間が省け、また施工時には可撓板が止水板を所定の角度に支持することにより止水板の倒れ込みを防止するので継手の施工が一層容易となり、施工コストを軽減できる利点がある。
【００４８】
また受圧鉄板等の部材を省略したので、部品点数が少なくてすみコストが低減するとともに施工の手間がさらに省ける。
【００４９】
また、棒状部材を袋状のスリーブで覆う構成を採用することにより、中空接続体とトンネル圧縮力、引張力が作用する場合に棒状部材と中空接続体との間に破壊が生じることを防止することができる上に、中空接続体とトンネルの接続部にせん断力が作用した場合は棒状部材の周面とスリーブ内周面との間の間隔内において棒状部分が径方向に移動することにより、中空接続体とトンネルの間のせん断力による相対変位を吸収することができる。
【図面の簡単な説明】
【図１】本発明の１実施形態を示す概略断面図である。
【図２】図１中のＡ部分の拡大断面図である。
【図３】図１中Ｂ−Ｂ矢視図である。
【図４】上記実施形態の継手の施工法を示す断面図である。
【図５】上記実施形態の継手の施工法を示す断面図である。
【図６】本発明の他の実施形態を示す図２と同様の断面図である。
【図７】可撓板と伸縮性止水板の他の実施形態を示す断面図である。
【図８】本発明の他の実施形態を示す概略断面図である。
【符号の説明】
１可撓継手
２トンネル
３割込立坑（中空接続体）
４可撓板
５伸縮性止水板
６棒状部材
８スリーブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible joint for connecting a tunnel such as a shield tunnel and a hollow connector connected to a tunnel such as an interrupting shaft (intermediate shaft).
[0002]
[Prior art]
When a shaft such as a manhole is provided between a start shaft and a reaching shaft in a horizontal shaft such as a long-distance shield tunnel, there is an interrupt shaft method in which the shield is interrupted and branched from the upper part after the shield tunnel is completed. When connecting an interrupting shaft (also called an intermediate shaft or shaft) to a shield tunnel in this way, the relative displacement between the interrupt shaft and the shield tunnel is allowed, and the stress caused by uneven ground subsidence or ground deformation due to earthquakes, etc. It is desirable to have a configuration that alleviates
[0003]
Conventionally developed for this purpose is a flexible joint described in JP-A-8-41921. The flexible joint is formed by sandwiching a rubber flexible member in the thickness direction between a pair of pressure-receiving iron plates and forming a ring corresponding to the transverse cross section of the interrupting shaft into a plurality of shapes in the circumferential direction. The split pieces are joined with their end faces abutted to form a ring corresponding to the cross section of the interrupt shaft, and are configured to be interposed between the interrupt shaft and the shaft base that is part of the tunnel It has been done. In this flexible joint, the rubber flexible member carries out displacement following the bending and horizontal displacement of the interrupting shaft generated during an earthquake in a state where the load of the interrupting shaft bears the load, and the water stop is maintained.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional flexible joint, since the flexible member is formed in an annular shape by connecting each divided piece with a bolt at the construction site, it takes time to ensure water-stopping, and the flexible member is provided with an anchor bolt. Therefore, there is a problem that it is necessary to individually fix to the formwork at the time of construction, and it takes time for construction. Further, since the water stop plate must be provided separately from the flexible member, complicated construction such as fixing of the water stop plate and processing of the formwork is required. Furthermore, the pressure-receiving iron plates provided on the upper and lower surfaces of the flexible member are also divided parts, and have joint parts for interconnecting them, so it is expensive to carry out the connection of the joint parts during the upper construction. There is a problem that it takes.
[0005]
Therefore, the conventional flexible joint has a problem that the structure is complicated and expensive as a whole, and the construction is very troublesome.
[0006]
In addition to the connection of the hollow connection body and the tunnel, etc., in order to cope with different ground structures such as the upper part of the shaft main body located in the soft ground and the lower part located in the rock, the upper part of the shaft is In some cases, it may be necessary to divide it into a lower part and connect both parts with a flexible joint.
[0007]
The present invention has been considered in view of the above circumstances, and has a simpler structure and saves the labor of construction. Furthermore, the relative displacement between a hollow connector such as an interrupting shaft and a tunnel or a vertical shaft divided vertically. It is intended to provide a flexible joint for connection such as a tunnel hollow connector that allows relative displacement between the upper part and the lower part and can sufficiently relieve stress caused by uneven ground subsidence or ground deformation due to earthquakes, etc. It is.
[0008]
[Means for Solving the Problems]
A tunnel hollow connector connecting flexible joint that achieves the above object is a flexible joint for connecting a hollow connector such as an interrupting shaft to a tunnel, and extends in the circumferential direction of the hollow connector. An annular flexible plate made of rubber, synthetic resin or the like interposed between the hollow connection body connection base portion of the tunnel and each connection end surface of the hollow connection body, the hollow connection body connection base portion of the tunnel , and the It is formed in an annular shape integrally with the flexible plate so as to extend at a predetermined angle from both surfaces of the flexible plate parallel to each connection end surface of the hollow connection body, and one end side is a wall body of the hollow connection body A stretchable water stop plate with the other end embedded in the tunnel at the end, and one end on the end of the wall of the hollow connector so as to extend in the axial direction of the hollow connector, and the other end on the end And a rod-shaped member disposed in the tunnel.
[0009]
Here, the “hollow connection body” has a normal connection angle with the tunnel, but includes a case where the connection angle is oblique. In addition to an interrupting shaft connected to the upper part of the tunnel, a starting shaft, a reaching shaft, and a shaft disposed in a horizontal direction with respect to the tunnel are also included.
[0010]
According to the present invention, when an uneven subsidence of the ground that causes relative displacement between the tunnel and the hollow connector connected to the hollow connector connection base of the tunnel or a ground change caused by an earthquake occurs, the flexible The joint follows or resists the relative displacement to prevent the joint from being broken and to maintain water stoppage.
[0011]
That is, when relative displacement occurs in the direction in which the hollow connector and the hollow connector connection base of the tunnel approach each other, that is, when a compressive force is applied, the flexible plate is compressed and deformed following the relative displacement. This compressive force is absorbed. Conversely, when relative displacement occurs in the direction in which the hollow connection body and the hollow connection body connection base portion of the tunnel are separated from each other, that is, when a tensile force is applied, the stretchable water stop plate should extend following the relative displacement. To absorb this tensile force. Further, when relative displacement occurs so that the hollow connection body rotates with respect to the hollow connection body connection base portion of the tunnel , the same action as described above occurs on the compression side and the tension side.
[0012]
In addition, when an external force that causes relative displacement in the tunnel axis direction, that is, a shear force, acts on the hollow connector and the hollow connector connection base of the tunnel, the rod-shaped member supports this shear force and the hollow connection by the shear force. Prevents relative deformation between the body and the hollow connector connection base of the tunnel.
[0013]
In one aspect of the present invention, a portion of the end of the wall of the hollow connector where the rod-shaped member is disposed has a bag shape covering the rod-shaped member with a predetermined distance from the circumferential surface and the end surface of the rod-shaped member. Sleeves are provided.
[0014]
With this configuration, when a compressive force is applied between the hollow connector and the hollow connector connection base of the tunnel , the portion where the rod-shaped member at the end of the wall body of the hollow connector is disposed is the top surface of the sleeve. By sliding in the sleeve in a direction in contact with the inner surface of the top of the sleeve within the distance from the inner surface of the top, it is possible to prevent breakage between the rod-shaped member and the wall of the hollow connector.
[0015]
In addition, when a tensile force is applied between the hollow connector and the hollow connector connecting base of the tunnel, the above-mentioned portion of the rod-shaped member is similarly slid in the sleeve in the direction of coming out of the sleeve, and the rod-shaped member and the hollow connector are similarly used. It is possible to prevent the breakage between the wall body and the wall.
[0016]
Further, when a shearing force is applied to the hollow connector and the hollow connector connection base of the tunnel , the above-mentioned portion of the rod-shaped member moves in the radial direction of the rod-shaped member within the interval between the circumferential surface and the sleeve inner circumferential surface. By doing so, the relative displacement by the shear force between the hollow connector and the hollow connector connection base of the tunnel can be absorbed within the range.
[0017]
Furthermore, according to the present invention, there is provided a flexible joint for mutually connecting the upper and lower parts of the shaft divided into an upper part and a lower part, and the shaft is extended in the circumferential direction of the shaft. An annular flexible plate made of rubber, synthetic resin or the like interposed between the upper part and each connection end face of the shaft, and the flexible plate parallel to each connection end face of the shaft upper part and the shaft lower part. It is formed in an annular shape integrally with the flexible plate so as to extend from both sides at a predetermined angle, and one end side is at the lower end of the wall body at the upper part of the shaft and the other end is at the upper end part of the wall at the lower part of the shaft. An embedded stretchable water stop plate and a rod-like member having one end side disposed at the lower end of the wall body at the upper portion of the shaft and the other end disposed at the upper end portion of the wall body at the lower portion of the shaft so as to extend in the axial direction of the shaft A flexible joint for connecting shafts is provided. Also in this flexible joint, the portion where the rod-like member is arranged at the lower end of the wall body at the top of the shaft is a bag-like shape covering the rod-like member with a predetermined distance from the circumferential surface and end surface of the rod-like member. A sleeve can be provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019]
FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a portion A in FIG. 1, and FIG.
[0020]
In this embodiment, the flexible joint 1 of the present invention is used for connection between a cylindrical shield tunnel 2 and an interrupting shaft 3 having an elliptical ring-shaped cross section provided in the upper part thereof.
[0021]
The flexible joint 1 protrudes from the upper part of the tunnel 2 and has a cross-sectional cross section of an elliptic ring with a connection end surface 7a (FIG. 2) of a shaft base 7 and a connection end surface 3a of an interrupt shaft 3 installed thereon (FIG. 2). And a flexible plate 4, a stretchable water stop plate 5, and a rod-like member 6.
[0022]
The flexible plate 4 is made of a flexible material such as rubber, synthesis, or resin, and for example, chloroprene rubber having excellent weather resistance and heat resistance is preferable. The flexible plate 4 has a predetermined thickness D and a width close to half the wall thickness of the interrupting shaft 3, and extends in the circumferential direction of the interrupting shaft 3 on the outer peripheral side of the interrupting shaft 3. It is interposed between the connecting end surface 7a of the shaft base 7 and the connecting end surface 3a of the interrupting shaft 3, and the cross section that matches the shape of these connecting end surfaces 7a, 3a is configured as an elliptical ring-shaped annular plate shape. ing.
[0023]
The stretchable water stop plate 5 is made of a material such as stretchable and flexible rubber, and is in full contact with both surfaces of the flexible plate 4 parallel to both connection end surfaces 7a and 3a, that is, both connection end surfaces 7a and 3a. Are formed in an annular shape integrally with the flexible plate 4 so as to extend from the both surfaces 4a and 4b (upper and lower surfaces in FIG. 2) at a predetermined angle, and one end side of the water stop plate 5 is an interrupting shaft 3, the other end side is embedded in the shaft base portion 7, respectively. In the present embodiment, the stretchable water stop plate 5 is formed at a substantially central portion in the width direction of the flexible plate 4, and therefore the cross section is elliptical in the outer peripheral side of the interrupting shaft 3 and the outer peripheral side of the shaft base 7. It is formed as a member. The installation angle of the stretchable water blocking plate 5 with respect to the flexible plate 4 is perpendicular to the upper and lower surfaces 4a and 4b of the flexible plate 4 in this embodiment, but may be installed obliquely.
[0024]
Both end portions of the stretchable water stop plate 5 are formed as bulging end portions 5a bulging in a cross section in the width direction of the water stop plate in order to enhance the water stop function, and the outer peripheral surface side is a water expansion rubber. 5b.
[0025]
As is apparent from FIG. 3, a plurality of circular rod-like members 6 having a circular cross section are provided at substantially the center of the wall end portion 3b and the shaft base 7 of the interrupt shaft. One end side 6 a is disposed at the wall end 3 b of the interrupting shaft 3 and the other end side 6 b is disposed at the shaft base 7 of the tunnel 2 so as to extend in the axial direction of the shaft 3. For example, a dowel bar is suitable as the rod-shaped member. In the present embodiment, the portion 6a disposed at the wall end 3b of the interrupting shaft 3 of each bar-shaped member 6 is spaced from the peripheral surface 6c and the end surface 6d of the bar-shaped member 6 by a predetermined distance 11 and 12. A bag-like sleeve 8 made of synthetic resin or the like that covers the rod-like member 6 is provided. The sleeve 8 is formed in a cylindrical shape with a cap.
[0026]
In FIG. 2, reference numeral 9 denotes foamed rubber that is adjacent to the inner peripheral side of the flexible plate 4 and is interposed in the inner peripheral space between the connection end surface 3 a of the interrupting shaft 3 and the connection end surface 7 a of the shaft base 7. The rod-shaped member 6 is disposed through the outer peripheral portion of the joint material 9. Reference numeral 10 denotes a water-stop ringing caulking material made of rubber or the like provided adjacent to the inner peripheral side of the joint material 9.
[0027]
Next, the operation of the flexible joint will be described.
[0028]
If ground displacement occurs due to uneven settlement of the ground or earthquake, and relative displacement occurs in the direction in which the interrupting shaft 3 and tunnel 2 (that is, the shaft base 7) approach each other, the flexible plate 4 is moved to this relative displacement. It is compressed following it and absorbs the compressive force. At this time, the portion 6a of the rod-shaped member 6 slides in the sleeve 8 in such a direction that the top surface 6d abuts the sleeve top portion inner surface 8a. Therefore, by setting the interval 12 between the top surface 6d of the rod-shaped member 6 and the sleeve top portion inner surface 8a to an appropriate value, the rod-shaped member 6 and the end wall 3b of the interrupting shaft 3 within that range It is possible to prevent the wall 3b from being damaged due to the collision.
[0029]
Conversely, when a relative displacement occurs in the direction in which the interrupting shaft 3 and the tunnel 2 are separated from each other, the stretchable water stop plate 5 follows this relative displacement and extends to absorb the tensile force and maintain. At this time, the portion 6 a of the rod-shaped member 6 slides in the sleeve 8 in a direction to come out of the sleeve 8.
[0030]
When relative displacement occurs such that the interrupting shaft 3 rotates with respect to the shaft base 7, the same action as described above occurs on the compression side and the tension side.
[0031]
Further, when a shearing force is applied so that the interrupting shaft 3 and the tunnel 2 cause relative displacement in the tunnel axial direction, the rod-like member 6 supports the shearing force, and the interrupting shaft 3 and the shaft base by the shearing force are supported. 7 to prevent relative deformation. At this time, the portion 6a of the rod-shaped member 6 moves in the radial direction of the rod-shaped member 6 within the interval 11 between the peripheral surface 6c and the sleeve inner peripheral surface 8b, so that a relatively small relative displacement within the range of the interval 11 is achieved. If it is a quantity, the relative displacement due to the shearing force between the interrupting shaft 3 and the shaft base 7 can be absorbed.
[0032]
Next, the construction method of this flexible joint will be described with reference to FIGS.
[0033]
(1) An annular assembly of the flexible plate 4 and the stretchable water stop plate 5 is manufactured in advance in a factory and is carried to the construction site. This assembly is manufactured, for example, by joining both ends of a belt-like assembly in which the water stop plate 5 is integrally formed with the flexible plate 4 to make them endless.
[0034]
(2) The assembly of the flexible plate 4 and the stretchable water stop plate 5 is assembled into the assembly holding mold 11. That is, as shown in FIG. 4, a portion near the bulging end portion 5 a of the water stop plate 5 is held by a pair of pieces 12, and the upper surface 4 a of the flexible plate 4 is pressed against the lower surface of the mold 11.
[0035]
(3) In this state, the assembly holding mold 11 is positioned with respect to the outer mold 13 and fixed to the outer mold 13.
[0036]
(4) The rod-like member 6 is fixed at a predetermined position.
[0037]
(5) The lower inner periphery formwork 14 is assembled and the lower concrete 15 is placed.
[0038]
(6) After curing the lower concrete 15, the assembly holding mold 11 and the lower inner peripheral mold 14 are removed, and the joint material 9 is attached to the concrete surface as shown in FIG.
[0039]
(7) The sleeve 8 is put on the rod-like member 6.
[0040]
(8) Assemble the upper inner periphery formwork 16 to which the caulking piece 17 is attached, and place the upper concrete 18.
[0041]
(9) After the upper concrete 18 is cured, all the molds are removed and the caulking work is performed to form the caulking material 10 (FIG. 2).
[0042]
According to the above construction method, the flexible plate 4 and the stretchable water stop plate 5 are manufactured in advance as an integral assembly, and in the construction site, the concrete placement work can be performed simply by holding the assembly with the formwork. Since it can be performed, the construction can be performed very easily as compared to a conventional joint for assembling divided pieces. Further, when the assembly holding mold 11 and the lower inner peripheral mold 14 are removed after placing the lower concrete 15, the stretchable water stop plate 5 is firmly fixed by the flexible plate 4 formed integrally therewith. Since it is supported, the waterstop 5 is prevented from falling down, and when placing the upper concrete, it is easy to place the upper concrete 18 without requiring a special formwork for holding the waterstop 5. Can be done.
[0043]
In the above embodiment, the flexible plate 4 and the stretchable water stop plate 5 are provided on the outer peripheral side of the interrupting shaft 3, but the flexible plate 4 and the water stop plate 5 are split as shown in FIG. You may provide in both the outer peripheral side and inner peripheral side of the pit shaft 3.
[0044]
Moreover, in said embodiment, although the stretchable water stop board 5 is arrange | positioned in the center of the flexible board 4, the position of the water stop board 5 is not restricted to this, For example, as shown in FIG. The plate 5 may be formed at one end of the flexible plate 4.
[0045]
The tunnel is not limited to a shield tunnel, and can be applied to tunnels of other configurations, and the cross-sectional shape of the tunnel and the hollow connection body is not limited to an ellipse, and may be any of a circle, a rectangle, and other polygons. Good.
[0046]
Moreover, this invention can be applied not only when connecting a hollow connection body to a tunnel but for the connection of the vertical shaft main body divided | segmented up and down. FIG. 8 is a schematic cross-sectional view showing an embodiment in which the present invention is applied to a flexible joint for connecting an upper part and a lower part of a shaft divided into two upper and lower parts. In this embodiment, the upper part 20a of the shaft 20 is arranged in the soft ground 21, the lower part 20b of the shaft 20 is arranged in the rock 22 and the upper part 20a and the lower part 20b are connected to each other by a flexible joint 23. Yes. Reference numeral 24 denotes a culvert such as a sewer connected to the vertical shaft lower part 20b. The flexible joint 23 extends in the circumferential direction of the shaft 20 and is an annular flexible material made of rubber, synthetic resin or the like interposed between the connecting end surfaces 20c and 20d of the shaft upper portion 20a and the shaft lower portion 20b. The plate is formed in an annular shape integrally with the flexible plate so as to extend at a predetermined angle from both sides of the flexible plate parallel to the connection end surfaces 20c and 20d of the shaft upper portion 20a and the shaft lower portion 20b. Stretch water stop plate embedded in the wall lower end 20e of the vertical shaft upper part 20a and the other end side in the wall upper end 20f of the vertical shaft lower part 20b, and one end side of the vertical shaft upper part so as to extend in the axial direction of the vertical shaft 20 The other end side is provided in the wall lower end part 20e of 20a with the rod-shaped member arrange | positioned at the wall upper end part 20f of the shaft lower part 20b. A bag-like sleeve that covers the rod-shaped member is provided at a predetermined distance from the peripheral surface and end surface of the rod-shaped member at a portion of the rod-shaped member that is disposed at the wall lower end 20e of the shaft upper portion 20a. As specific configurations of the flexible plate, the stretchable water stop plate, the rod-shaped member, and the sleeve covering the rod-shaped member, the configurations of the above-described embodiments described with reference to FIGS. 1 to 7 can be used.
[0047]
【The invention's effect】
As described above, according to the present invention, since the annular flexible plate and the annular stretchable water stop plate are integrally formed, the flexible plate is divided into a plurality of parts like a conventional flexible joint. Compared to a piece consisting of a piece and a water stop plate provided separately from the flexible plate, the construction work is saved, and the flexible plate supports the water stop plate at a predetermined angle during construction. Since the falling of the plate is prevented, the construction of the joint becomes easier and the construction cost can be reduced.
[0048]
Further, since members such as pressure-receiving iron plates are omitted, the number of parts is reduced, so that the cost can be reduced and the labor of construction can be further saved.
[0049]
In addition, by adopting a configuration in which the rod-shaped member is covered with a bag-like sleeve, it is possible to prevent breakage between the rod-shaped member and the hollow connector when a hollow connector, tunnel compressive force, and tensile force are applied. In addition, when a shearing force is applied to the connection portion of the hollow connector and the tunnel, the rod-shaped portion moves in the radial direction within the interval between the circumferential surface of the rod-shaped member and the inner circumferential surface of the sleeve. The relative displacement due to the shearing force between the hollow connector and the tunnel can be absorbed.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 1;
FIG. 4 is a cross-sectional view showing a method for constructing the joint according to the embodiment.
FIG. 5 is a cross-sectional view showing a method of constructing the joint according to the embodiment.
FIG. 6 is a cross-sectional view similar to FIG. 2, showing another embodiment of the present invention.
FIG. 7 is a cross-sectional view showing another embodiment of the flexible plate and the stretchable water stop plate.
FIG. 8 is a schematic sectional view showing another embodiment of the present invention.
[Explanation of symbols]
1 Flexible joint 2 Tunnel 3 Interrupting shaft (hollow connection body)
4 Flexible plate 5 Stretch water stop plate 6 Bar-shaped member 8 Sleeve

Claims

トンネルに割込立坑等の中空接続体を接続するための可撓継手であって、
該中空接続体の周方向に延長するようにして該トンネルの中空接続体接続基部と該中空接続体の各接続端面との間に介装されたゴム・合成樹脂等からなる環状の可撓板と、
該トンネルの中空接続体接続基部および該中空接続体の各接続端面と平行な該可撓板の両面から所定の角度をなして延長するようにして該可撓板と一体的に環状に形成され、一端側が該中空接続体の壁体端部に、他端側が該トンネルに埋設された伸縮性止水板と、
該中空接続体の軸方向に延長するようにして一端側が該中空接続体の壁体端部に、他端側が該トンネルに配置された棒状部材
とを備えることを特徴とするトンネル中空接続体接続用可撓継手。A flexible joint for connecting a hollow connector such as an interrupting shaft to a tunnel,
An annular flexible plate made of rubber, synthetic resin or the like interposed between the hollow connection body connection base portion of the tunnel and each connection end surface of the hollow connection body so as to extend in the circumferential direction of the hollow connection body When,
It is formed in an annular shape integrally with the flexible plate so as to extend at a predetermined angle from both surfaces of the flexible plate parallel to the hollow connection body connection base of the tunnel and each connection end surface of the hollow connection body. A stretchable water stop plate having one end side embedded in the end of the wall of the hollow connector and the other end embedded in the tunnel;
A tunnel hollow connector connection characterized by comprising: a rod-like member arranged at one end side at the end of the wall of the hollow connector and extending at the other end side in the tunnel so as to extend in the axial direction of the hollow connector Flexible joint.

該中空接続体の壁体端部の該棒状部材が配置された部分には、該棒状部材の周面および端面と所定の間隔をおいて該棒状部材を覆う袋状のスリーブが設けられていることを特徴とする請求項１記載の可撓継手。 A bag-like sleeve that covers the rod-shaped member is provided at a predetermined distance from the peripheral surface and the end surface of the rod-shaped member at the portion where the rod-shaped member is disposed at the end of the wall of the hollow connector . The flexible joint according to claim 1.

上部と下部とに分割された立坑の該上部と下部とを相互に接続するための可撓継手であって、
該立坑の周方向に延長するようにして該立坑上部と該立坑下部の各接続端面との間に介装されたゴム・合成樹脂等からなる環状の可撓板と、
該立坑上部および該立坑下部の各接続端面と平行な該可撓板の両面から所定の角度をなして延長するようにして該可撓板と一体的に環状に形成され、一端側が該立坑上部の壁体下端部に、他端側が該立坑下部の壁体上端部に埋設された伸縮性止水板と、
該立坑の軸方向に延長するようにして一端側が該立坑上部の壁体下端部に、他端側が該立坑下部の壁体上端部に配置された棒状部材
とを備えることを特徴とする立坑接続用可撓継手。A flexible joint for interconnecting the upper and lower parts of a shaft divided into an upper part and a lower part,
An annular flexible plate made of rubber / synthetic resin or the like interposed between the upper part of the shaft and each connection end surface of the lower part of the shaft so as to extend in the circumferential direction of the shaft,
The shaft is formed in an annular shape integrally with the flexible plate so as to extend from both surfaces of the flexible plate parallel to the connection end surfaces of the shaft and the shaft lower portion, and one end side is formed on the shaft upper portion. A stretchable water stop plate with the other end side embedded in the wall upper end of the lower shaft,
A shaft connection comprising: a rod-like member having one end side disposed at the lower end portion of the wall body at the upper portion of the shaft and the other end side disposed at the upper end portion of the wall body at the lower portion of the shaft so as to extend in the axial direction of the shaft Flexible joint.

該立坑上部の壁体下端部の該棒状部材が配置された部分には、該棒状部材の周面および端面と所定の間隔をおいて該棒状部材を覆う袋状のスリーブが設けられていることを特徴とする請求項３記載の可撓継手。 A bag-like sleeve that covers the rod-shaped member is provided at a predetermined distance from the peripheral surface and end surface of the rod-shaped member at a portion where the rod-shaped member is disposed at the lower end of the wall body at the top of the shaft. The flexible joint according to claim 3.