JP5855986B2 - Seal structure between tunnels - Google Patents

Seal structure between tunnels Download PDF

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JP5855986B2
JP5855986B2 JP2012060700A JP2012060700A JP5855986B2 JP 5855986 B2 JP5855986 B2 JP 5855986B2 JP 2012060700 A JP2012060700 A JP 2012060700A JP 2012060700 A JP2012060700 A JP 2012060700A JP 5855986 B2 JP5855986 B2 JP 5855986B2
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tunnel
band member
elastic
base
seal
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JP2013194387A (en
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圭 伊賀崎
圭 伊賀崎
森田 泰司
泰司 森田
克彦 高倉
克彦 高倉
誠之 関谷
誠之 関谷
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Taisei Corp
Mutsubushi Rubber Co Ltd
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Taisei Corp
Mutsubushi Rubber Co Ltd
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本発明は、先行トンネルとその隣に構築される後行トンネルとの間に設けられるトンネル間シール構造に関する。   The present invention relates to an inter-tunnel seal structure provided between a preceding tunnel and a succeeding tunnel constructed next to the preceding tunnel.

近年、複数本の小断面トンネルを構築した後に、各トンネルの不要な覆工を撤去して大きな空間を形成しつつ、各トンネルの残置された覆工を利用して本設の頂底版や側壁などを形成することにより大断面トンネルを築造する技術が知られている。なお、複数の小断面トンネルは、時間差をもって順次に構築され、後行トンネルは、先行トンネルの隣りに構築される。また、各トンネルは、例えば、推進工法によって構築される。   In recent years, after constructing multiple small cross-section tunnels, unnecessary lining of each tunnel is removed to form a large space, while the remaining lining of each tunnel is used to construct the top plate and sidewall A technique for constructing a large-section tunnel is known by forming, for example. The plurality of small-section tunnels are sequentially constructed with a time difference, and the succeeding tunnel is constructed next to the preceding tunnel. Each tunnel is constructed by, for example, a propulsion method.

ここで、推進工法とは、トンネルの覆工となる筒状の推進函体(トンネル函体)を坑口から順次地中に圧入してトンネルを構築する工法である。なお、推進函体の先端には、刃口や掘進機などが取り付けられている。推進工法の掘進機は、推進函体に反力をとって自ら掘進するもの(つまり、推進ジャッキを装備しているもの)でもよいし、推進函体を介して伝達された元押しジャッキの推力により掘進するものであってもよい。   Here, the propulsion method is a method of constructing a tunnel by sequentially press-fitting a cylindrical propulsion box (tunnel box), which becomes a tunnel lining, into the ground from a wellhead. In addition, a blade edge, an excavation machine, etc. are attached to the front-end | tip of a propulsion box. The propulsion method excavator may be one that digs itself by taking a reaction force on the propulsion box (that is, one that is equipped with a propulsion jack), or the thrust of the main jack transmitted through the propulsion box You may dig by.

先行トンネルとその隣に構築される後行トンネルとの間に設けられるトンネル間シール構造は、特許文献1に示すようなものがある。図4に示すように、このトンネル間シール構造100は、後行トンネル101の表面に設けられた弾性シール部材110と、先行トンネル102の表面に設けられた弾性帯部材120とを備えている。弾性シール部材110は、後行トンネル110aの外表面に固定されるベース部111と、このベース部111と一体的に形成されたリップ部112とを備えてなる。リップ部112は、先端が大断面トンネルの外側に向いており、大断面トンネルの外側からの水圧によって弾性帯部材120の表面に向かって弾性的に押し付けられる。弾性帯部材120は、押圧板部130で幅方向両端部を先行トンネル102に押えることで、先行トンネル102に固定されている。弾性帯部材120は弾性シール部材110よりも軟質の材料にて構成されており、リップ部112の先端を弾性帯部材120に食い込ませることで止水性能を高めている。   An inter-tunnel seal structure provided between a preceding tunnel and a subsequent tunnel constructed next to the preceding tunnel is disclosed in Patent Document 1. As shown in FIG. 4, the inter-tunnel seal structure 100 includes an elastic seal member 110 provided on the surface of the trailing tunnel 101 and an elastic band member 120 provided on the surface of the preceding tunnel 102. The elastic seal member 110 includes a base portion 111 that is fixed to the outer surface of the trailing tunnel 110a, and a lip portion 112 that is formed integrally with the base portion 111. The tip of the lip portion 112 faces the outside of the large cross-section tunnel, and is elastically pressed toward the surface of the elastic band member 120 by water pressure from the outside of the large cross-section tunnel. The elastic band member 120 is fixed to the preceding tunnel 102 by pressing both ends in the width direction against the preceding tunnel 102 with the pressing plate 130. The elastic band member 120 is made of a softer material than the elastic seal member 110, and the water stop performance is enhanced by causing the tip of the lip 112 to bite into the elastic band member 120.

特開2011−202421号公報JP 2011-202421 A

特許文献1のようなトンネル間シール構造では、弾性帯部材120が軟質の材料にて構成されているので、リップ部112に高水圧が作用すると、弾性帯部材120が押圧されて大きく変形し、押圧板部130の押圧部分から抜け出して先行トンネル102から外れてしまうおそれがあった。   In the inter-tunnel seal structure as in Patent Document 1, since the elastic band member 120 is made of a soft material, when a high water pressure acts on the lip 112, the elastic band member 120 is pressed and greatly deformed, There is a possibility that the pressing plate portion 130 may come out of the pressing portion and come off the preceding tunnel 102.

このような観点から、本発明は、弾性帯部材が先行トンネルから外れることなく、十分な止水性能を得られるトンネル間シール構造を提供することを課題とする。   From such a point of view, an object of the present invention is to provide an inter-tunnel seal structure that can obtain sufficient water stopping performance without the elastic band member being detached from the preceding tunnel.

このような課題を解決するための請求項1に係る発明は、先行トンネルとその隣に構築される後行トンネルとの間に設けられるトンネル間シール構造において、トンネル長手方向に沿って前記後行トンネルの表面に設けられた弾性シール部材と、前記先行トンネルの表面で前記弾性シール部材に対向する位置に設けられた弾性帯部材とを備えており、前記弾性帯部材は、基部と、この基部に積層される表面部とを備えており、前記表面部は、前記弾性シール部材よりも軟質の材料からなり、前記基部は、前記表面部よりも硬質の材料からなり、前記表面部は、前記基部よりも小さい幅寸法で形成され、前記基部の幅方向両端部では、前記基部の表面が露出しており、前記基部の幅方向両端部が取付金具の押圧板部で押さえられることで前記弾性帯部材が前記先行トンネルに固定されており、前記基部の幅方向両端面は、前記取付金具の側面に当接するとともに、前記表面部の幅方向両端面は、前記押圧板部の側面に当接しており、前記弾性シール部材は、前記先行トンネル側に突出しその先端部が前記表面部に当接することを特徴とするトンネル間シール構造である。 The invention according to claim 1 for solving such a problem is the following structure in the inter-tunnel seal structure provided between the preceding tunnel and the succeeding tunnel constructed next thereto, along the longitudinal direction of the tunnel. An elastic seal member provided on the surface of the tunnel, and an elastic band member provided at a position facing the elastic seal member on the surface of the preceding tunnel, the elastic band member comprising a base and the base And the surface portion is made of a material softer than the elastic seal member, the base portion is made of a material harder than the surface portion, and the surface portion is It is formed with a width dimension smaller than that of the base part, the surface of the base part is exposed at both ends in the width direction of the base part, and the both ends of the base part in the width direction are pressed by the pressing plate part of the mounting bracket. A band member is fixed to the preceding tunnel, and both end surfaces in the width direction of the base portion are in contact with side surfaces of the mounting bracket, and both end surfaces in the width direction of the surface portion are in contact with side surfaces of the pressing plate portion. The elastic seal member has an inter-tunnel seal structure , wherein the elastic seal member protrudes toward the preceding tunnel, and a tip portion thereof abuts on the surface portion.

このような構成によれば、基部が硬質であるので、弾性帯部材の変形を抑えることができ、先行トンネルから外れるのを防止できる。また表面部が軟質であるので、弾性シール部材の先端部が表面部に食い込んで十分な止水性能を得ることができる。さらに、弾性帯部材の先行トンネルへの固定強度を高めることができる。 According to such a configuration, since the base portion is hard, deformation of the elastic band member can be suppressed, and it is possible to prevent the elastic belt member from being detached from the preceding tunnel. Further, since the surface portion is soft, the distal end portion of the elastic seal member can bite into the surface portion, and sufficient water stopping performance can be obtained. Further, the strength of fixing the elastic band member to the preceding tunnel can be increased.

なお、前記表面部と前記基部は、例えば、加硫によって接合するとよい。このような構成によれば、表面部と基部の接合強度が高く、表面部が基部から剥がれるのを防止できる。   In addition, the said surface part and the said base part are good to join by vulcanization, for example. According to such a configuration, the bonding strength between the surface portion and the base portion is high, and the surface portion can be prevented from peeling off from the base portion.

本発明のトンネル間シール構造によれば、弾性帯部材が先行トンネルから外れることなく、十分な止水性能を得られる。   According to the inter-tunnel seal structure of the present invention, sufficient waterproof performance can be obtained without the elastic band member being detached from the preceding tunnel.

本発明の実施形態に係るトンネル間シール構造を示した図であって、(a)は弾性帯部材が平坦な状態を示した断面図、(b)は弾性シール部材に高い圧力が作用した状態を示した拡大断面図である。It is the figure which showed the seal structure between tunnels which concerns on embodiment of this invention, Comprising: (a) is sectional drawing which showed the state with a flat elastic belt member, (b) is the state in which high pressure acted on the elastic seal member It is the expanded sectional view which showed. 弾性シール部材と弾性帯部材の接触部分を示した図であって、(a)は土砂が咬み込んだ状態を示した拡大断面図、(b)は土砂が弾性帯部材に埋没した状態を示した拡大断面図である。It is the figure which showed the contact part of an elastic sealing member and an elastic belt member, Comprising: (a) is an expanded sectional view which showed the state which earth and sand bite, (b) shows the state where earth and sand were buried in the elastic band member FIG. 大断面トンネルを示した断面図である。It is sectional drawing which showed the large section tunnel. 従来のシール構造を示した断面図である。It is sectional drawing which showed the conventional seal structure.

本発明の実施形態に係るトンネル間シール構造を、添付した図面を参照しながら詳細に説明する。なお、図1および図2においては、後行トンネルが先行トンネルの下側にある状態を図示している。   An inter-tunnel seal structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a state in which the subsequent tunnel is below the preceding tunnel.

図3に示すように、トンネル間シール構造Sは、推進工法によって並設された複数本のトンネル10を利用して築造する大断面トンネル1の内部(内空部)と外部(地山部)との間を止水する構造である。大断面トンネル1は、その横断面の全てを実質的に含むように並設された複数本(本実施形態では六本)のトンネル10,10,…を利用して築造したものであり、頂版1A、底版1Bおよび側壁1C,1Cを備えている。各トンネル10は、軸方向に連接されたトンネル函体によって構成されている。   As shown in FIG. 3, the seal structure S between tunnels includes an inside (inner space portion) and an outside (natural mountain portion) of a large section tunnel 1 constructed by using a plurality of tunnels 10 arranged in parallel by a propulsion method. It is a structure that stops water between. The large-section tunnel 1 is constructed by using a plurality of (six in this embodiment) tunnels 10, 10,... Arranged side by side so as to substantially include all of the transverse sections. A plate 1A, a bottom plate 1B, and side walls 1C and 1C are provided. Each tunnel 10 is configured by a tunnel box connected in the axial direction.

図1に示すように、トンネル間シール構造Sは、先行トンネル10bとその隣に構築される後行トンネル10aとの間に設けられるものである。トンネル間シール構造Sは、後行トンネル10aに設けられた弾性シール部材30と、先行トンネル10bに設けられた弾性帯部材50とを備えている。   As shown in FIG. 1, the inter-tunnel seal structure S is provided between the preceding tunnel 10b and the succeeding tunnel 10a constructed next thereto. The inter-tunnel seal structure S includes an elastic seal member 30 provided in the subsequent tunnel 10a and an elastic band member 50 provided in the preceding tunnel 10b.

弾性シール部材30は、推進方向(トンネル長手方向)に沿って延在し、隣り合う二つのトンネル10,10(先行トンネル10bと後行トンネルa)の隙間を閉塞するように設けられている。弾性シール部材30は、後行トンネル10aの表面のうち、先行トンネル10bに対向する部分に設けられている。先行トンネル10bの表面には、弾性帯部材50が固定されている。弾性シール部材30は、弾性帯部材50に対向して配置されており、後行トンネル10aの外周面に所定深さで形成された段差状のシール収容部15に収容されている。弾性シール部材30は、例えば、耐摩耗性を備えた硬質ゴムやウレタン等の弾性材料にて構成されている。弾性シール部材30は、ベース部31とリップ部32とを備えてなる。   The elastic seal member 30 extends along the propulsion direction (tunnel longitudinal direction) and is provided so as to close a gap between two adjacent tunnels 10 and 10 (the preceding tunnel 10b and the subsequent tunnel a). The elastic seal member 30 is provided in a portion of the surface of the trailing tunnel 10a that faces the preceding tunnel 10b. An elastic band member 50 is fixed to the surface of the preceding tunnel 10b. The elastic seal member 30 is disposed so as to face the elastic band member 50, and is accommodated in a step-shaped seal accommodating portion 15 formed at a predetermined depth on the outer peripheral surface of the subsequent tunnel 10a. The elastic seal member 30 is made of an elastic material such as hard rubber or urethane having wear resistance, for example. The elastic seal member 30 includes a base portion 31 and a lip portion 32.

ベース部31は、後行トンネル10aに固定される部分であって、推進方向に沿って連続する長尺の板状に形成されている。ベース部31は、シール取付金具40によって、幅方向行両端部が係止されている。具体的には、ベース部31の幅方向端部は、シール取付金具40のシール押圧板部46によって、シール収容部15の底面側に押圧された状態で固定されている。つまり、ベース部31の幅方向端部は、シール押圧板部46とシール収容部15の底面との間で、圧縮された状態で挟持されている。   The base portion 31 is a portion fixed to the trailing tunnel 10a and is formed in a long plate shape that is continuous along the propulsion direction. The base portion 31 is locked at both ends in the width direction by the seal mounting bracket 40. Specifically, the width direction end portion of the base portion 31 is fixed in a state of being pressed to the bottom surface side of the seal housing portion 15 by the seal pressing plate portion 46 of the seal mounting bracket 40. That is, the end in the width direction of the base portion 31 is sandwiched in a compressed state between the seal pressing plate portion 46 and the bottom surface of the seal housing portion 15.

リップ部32は、ベース部31と一体的に形成されている。リップ部32は、ベース部31の表面から先行トンネル10bに向かって斜めに立ち上がっており、ベース部31とリップ部32とで、断面が略V字状(図1ではリップ部32が上向きとなるように配置されている)を呈している。リップ部32は、ベース部31に対して弾性的に傾倒変形可能な部位である。リップ部32は、その先端部が先行トンネル10b側に向かって延在していて、初期状態よりも傾倒した状態(リップ部32がベース部31に近づいた状態)で、先行トンネル10bの外表面(本実施形態では弾性帯部材50の表面)に接触する。このとき、リップ部32は、初期状態に復元しようとする力によって、先行トンネル10b(弾性帯部材50の表面)に密着する。   The lip portion 32 is formed integrally with the base portion 31. The lip portion 32 rises obliquely from the surface of the base portion 31 toward the preceding tunnel 10b, and the cross-section of the base portion 31 and the lip portion 32 is substantially V-shaped (the lip portion 32 is upward in FIG. 1). Is arranged). The lip portion 32 is a portion that can be elastically tilted and deformed with respect to the base portion 31. The lip portion 32 extends toward the preceding tunnel 10b, and the outer surface of the preceding tunnel 10b is tilted from the initial state (the lip portion 32 is close to the base portion 31). (In this embodiment, it contacts the surface of the elastic band member 50). At this time, the lip portion 32 is brought into close contact with the preceding tunnel 10b (the surface of the elastic band member 50) by a force for restoring the initial state.

弾性シール部材30は、リップ部32の先端が大断面トンネル1(図3参照)の外側に向くように配置されている。つまり、ベース部31とリップ部32とにより形成される断面略V字状の溝条が、大断面トンネル1の外側に向いて開くように配置されている。これによって、弾性シール部材30の断面略V字状の溝条部分に、大断面トンネル1の外側からの圧力(水圧または土圧)が作用するようになっている。リップ部32の表面は、その復元力に合わせて、大断面トンネル1の外側の圧力によっても先行トンネル10bの外表面に押圧されて、先行トンネル10bに密着する。この復元力と大断面トンネル1の外側の圧力とが、リップ部32の押圧力となる。   The elastic seal member 30 is arranged so that the tip of the lip portion 32 faces the outside of the large-section tunnel 1 (see FIG. 3). That is, a groove having a substantially V-shaped cross section formed by the base portion 31 and the lip portion 32 is disposed so as to open toward the outside of the large cross-section tunnel 1. As a result, pressure (water pressure or earth pressure) from the outside of the large cross-section tunnel 1 acts on a groove portion having a substantially V-shaped cross section of the elastic seal member 30. The surface of the lip portion 32 is pressed against the outer surface of the preceding tunnel 10b by the pressure outside the large-section tunnel 1 in accordance with the restoring force, and comes into close contact with the preceding tunnel 10b. This restoring force and the pressure outside the large-section tunnel 1 become the pressing force of the lip portion 32.

シール取付金具40は、ベース部31の幅方向両端部にそれぞれ設けられている。シール取付金具40は、金属にて形成されている。シール取付金具40は、弾性シール部材30の長手方向(図1の紙面垂直方向)に沿って延在しており、ボルトB等の固定手段によって、シール収容部15の底面に固定されている。シール取付金具40は、被締付部41とシール押圧板部46とを備えてなる。被締付部41は、ボルトBによって締め付けられる部分であって、シール収容部15の底面に設置される。被締付部41には、ボルトBが挿通されるボルト貫通孔43が形成されている。ボルト貫通孔43は、推進方向に沿って所定ピッチで形成されている。一方、シール収容部15の底板15aにも、ボルト貫通孔16が形成されている。底板15aの裏面には、めねじ部材17が溶接固定されている。ボルト貫通孔16とめねじ部材17は同芯状に配置されている。ボルトBは、ボルト貫通孔43およびボルト貫通孔16に挿通され、その先端部が底板15aの裏面のめねじ部材17に螺合される。このボルトBによって、被締付部41は、前記シール収容部15の底面に固定される。   The seal mounting brackets 40 are respectively provided at both ends in the width direction of the base portion 31. The seal mounting bracket 40 is made of metal. The seal mounting bracket 40 extends along the longitudinal direction of the elastic seal member 30 (the direction perpendicular to the plane of FIG. 1), and is fixed to the bottom surface of the seal housing portion 15 by a fixing means such as a bolt B. The seal mounting bracket 40 includes a tightened portion 41 and a seal pressing plate portion 46. The tightened portion 41 is a portion to be tightened by the bolt B and is installed on the bottom surface of the seal housing portion 15. A bolt through hole 43 into which the bolt B is inserted is formed in the tightened portion 41. The bolt through holes 43 are formed at a predetermined pitch along the propulsion direction. On the other hand, a bolt through hole 16 is also formed in the bottom plate 15 a of the seal housing portion 15. A female screw member 17 is fixed by welding to the back surface of the bottom plate 15a. The bolt through hole 16 and the female screw member 17 are arranged concentrically. The bolt B is inserted into the bolt through hole 43 and the bolt through hole 16, and the tip portion thereof is screwed into the female screw member 17 on the back surface of the bottom plate 15 a. With this bolt B, the tightened portion 41 is fixed to the bottom surface of the seal housing portion 15.

被締付部41の表面には、板材47が溶接固定されている。板材47は、推進方向に沿って延在しており、幅方向一端部が弾性シール部材30側に張り出している。この張り出した部分がシール押圧板部46を構成している。板材47には、貫通孔48が形成されている。貫通孔48は、被締付部41のボルト貫通孔43と同芯状に配置されている。貫通孔48は、ボルト貫通孔43よりも大径になっている。貫通孔48には、ボルトBの頭部が収容される。リップ部32の基端に隣接するシール押圧板部46は、その表面が後行トンネル10aの外表面(シール収容部15の開口端)と略面一(本実施形態では、若干表面より内側になっている)になっている。リップ部32の先端側に位置するシール押圧板部46は、その表面が後行トンネル10aの外表面よりも深い位置となっており、シール押圧板部46よりもシール収容部15の開口端側にスペースを設けている。これにより、先行トンネル10bと後行トンネル10aの外表面が接触しても、弾性シール部材30の断面略V字状の溝条部分に大断面トンネル1の外側からの圧力(水圧または土圧)が作用し続けることが可能となっている。シール押圧板部46は、弾性シール部材30に対向する面全体で弾性シール部材30を押圧している。   A plate material 47 is fixed to the surface of the tightened portion 41 by welding. The plate material 47 extends along the propulsion direction, and one end portion in the width direction projects to the elastic seal member 30 side. This protruding portion constitutes the seal pressing plate portion 46. A through hole 48 is formed in the plate material 47. The through hole 48 is arranged concentrically with the bolt through hole 43 of the tightened portion 41. The through hole 48 has a larger diameter than the bolt through hole 43. The head of the bolt B is accommodated in the through hole 48. The surface of the seal pressing plate portion 46 adjacent to the base end of the lip portion 32 is substantially flush with the outer surface of the trailing tunnel 10a (the opening end of the seal housing portion 15) (in this embodiment, slightly inside the surface). It has become). The seal pressing plate portion 46 located on the front end side of the lip portion 32 has a surface deeper than the outer surface of the trailing tunnel 10 a, and is closer to the opening end of the seal housing portion 15 than the seal pressing plate portion 46. A space is provided. Thereby, even if the outer surface of the preceding tunnel 10b and the succeeding tunnel 10a come into contact with each other, the pressure (water pressure or earth pressure) from the outside of the large section tunnel 1 is applied to the groove portion having a substantially V-shaped section of the elastic seal member 30. Can continue to work. The seal pressing plate portion 46 presses the elastic seal member 30 with the entire surface facing the elastic seal member 30.

シール収容部15は、掘削機(図示せず)の後方に位置する複数の推進函体からなる後行トンネル10aの表面に形成されている。シール収容部15は、後行トンネル10aの表面のうち、先行トンネル10bに対向する部分に形成され、推進方向に沿って延在している。本実施形態では、シール収容部15は、先行トンネル10bに対向する表面の外側端(大断面トンネル1の外側方向の端)の角部に形成されている。シール収容部15は、所定深さ下がった段差形状(外側端は開放されている)を呈している。シール収容部15は、トンネル10の表面の外側端のスキンプレート11に形成された開口部(外側端は開放されている)の内側に、溶接固定された側板15bと底板15aとで区画されている。シール収容部15は、弾性シール部材30全体の厚さ寸法より小さい深さ寸法を有しており、弾性シール部材30をシール収容部15に設置したときにリップ部32の先端側(ベース部31につながる基端側の逆側)の一部が、シール収容部15の上開口部から突出するようになっている。なお、シール収容部の位置は、先行トンネルに対向する表面の外側端の角部に限定されるものではなく、角部よりも内側に形成してもよい。   The seal accommodating portion 15 is formed on the surface of the succeeding tunnel 10a including a plurality of propulsion boxes located behind the excavator (not shown). The seal accommodating portion 15 is formed in a portion of the surface of the subsequent tunnel 10a that faces the preceding tunnel 10b, and extends along the propulsion direction. In this embodiment, the seal accommodating part 15 is formed in the corner | angular part of the outer side end (end of the outer direction of the large cross section tunnel 1) of the surface facing the preceding tunnel 10b. The seal accommodating portion 15 has a step shape that is lowered by a predetermined depth (the outer end is open). The seal accommodating portion 15 is partitioned by a side plate 15b and a bottom plate 15a which are welded and fixed inside an opening portion (the outer end is open) formed in the skin plate 11 on the outer end of the surface of the tunnel 10. Yes. The seal housing portion 15 has a depth dimension smaller than the thickness of the entire elastic seal member 30, and the distal end side (base portion 31) of the lip portion 32 when the elastic seal member 30 is installed in the seal housing portion 15. A part of the side opposite to the base end side that is connected to the upper end of the seal housing 15 protrudes from the upper opening. Note that the position of the seal housing portion is not limited to the corner portion of the outer end of the surface facing the preceding tunnel, and may be formed inside the corner portion.

なお、本実施形態の弾性シール部材30は、断面略V字状に形成されているが、弾性シール部材30の構成を限定する趣旨ではない。例えば、断面U字状、L字状、T字状等、他の形状であってもよい。また、弾性シール部材30の構成は、ベース部31とリップ部32とを備えた形状に限定されるものではなく、例えば、袋体の内部に流体を充填して先行トンネルに押圧される構成のものであってもよい。   In addition, although the elastic sealing member 30 of this embodiment is formed in cross-sectional substantially V shape, it is not the meaning which limits the structure of the elastic sealing member 30. FIG. For example, other shapes such as a U-shaped section, an L-shape, and a T-shape may be used. The configuration of the elastic seal member 30 is not limited to the shape including the base portion 31 and the lip portion 32. For example, the configuration is such that the bag body is filled with fluid and pressed against the preceding tunnel. It may be a thing.

弾性帯部材50は、リップ部32の先端部が当接する部材である。弾性帯部材50は、弾性シール部材30に対向して、弾性シール部材30と平行に配置されている。弾性帯部材50は、弾性シール部材30と同様に、例えば、耐摩耗性を備えた硬質ゴムやウレタン等の材料にて構成されている。弾性帯部材50は、基部55と、基部55の表面に積層される表面部51とを備えた二層構造にて構成されている。表面部51は、弾性シール部材よりも軟質の材料からなり、基部55は、表面部51よりも硬質の材料からなる。本実施形態では、それぞれの硬さは、表面部51が硬度50で、基部55が弾性シール部材30と同等である硬度70となっている。なお、軟質弾性部51と硬質弾性部55の硬さは、前記の硬度に限定されるものではない。軟質弾性部51は、リップ部32が適度に食い込む硬さであればよく、硬質弾性部55は、リップ部32に押圧されても大きく変形しない硬さであればよい。表面部51と基部55は加硫によって接合されている。表面部51と基部55は、ともに断面矩形形状を呈しており、表面部51は、基部55よりも小さい幅寸法で形成されている。弾性帯部材50は、幅方向中央部が突出した断面凸形形状となっており、基部55の幅方向両端部が露出している。   The elastic band member 50 is a member with which the tip of the lip portion 32 abuts. The elastic band member 50 is disposed in parallel to the elastic seal member 30 so as to face the elastic seal member 30. Similar to the elastic seal member 30, the elastic band member 50 is made of a material such as hard rubber or urethane having wear resistance, for example. The elastic band member 50 has a two-layer structure including a base portion 55 and a surface portion 51 laminated on the surface of the base portion 55. The surface portion 51 is made of a softer material than the elastic seal member, and the base portion 55 is made of a harder material than the surface portion 51. In the present embodiment, the hardness of each surface portion 51 is 50 and the hardness of the base portion 55 is 70, which is equivalent to that of the elastic seal member 30. In addition, the hardness of the soft elastic part 51 and the hard elastic part 55 is not limited to the said hardness. The soft elastic portion 51 only needs to have a hardness that allows the lip portion 32 to bite in moderately, and the hard elastic portion 55 only needs to have a hardness that does not greatly deform even when pressed by the lip portion 32. The surface portion 51 and the base portion 55 are joined by vulcanization. Both the surface portion 51 and the base portion 55 have a rectangular cross section, and the surface portion 51 is formed with a width dimension smaller than that of the base portion 55. The elastic band member 50 has a convex cross-sectional shape in which a central portion in the width direction protrudes, and both end portions in the width direction of the base portion 55 are exposed.

弾性帯部材50は、先行トンネル10bの外周面に形成された帯部材収容部20に収容されている。弾性帯部材50の頂部の先端面(先行トンネル10bの表面に露出する表面部51の表面)に弾性シール部材30のリップ部32が当接して摺動するようになっている。弾性帯部材50の先端面は、平坦になっている。表面部51の端に隣接する帯部材押圧板部66は、その表面が先行トンネル10bの外表面(帯部材収容部20の開口端)と略面一になっている。   The elastic band member 50 is accommodated in the band member accommodating portion 20 formed on the outer peripheral surface of the preceding tunnel 10b. The lip portion 32 of the elastic seal member 30 comes into contact with and slides on the top end surface of the elastic band member 50 (the surface of the surface portion 51 exposed on the surface of the preceding tunnel 10b). The distal end surface of the elastic band member 50 is flat. The band member pressing plate portion 66 adjacent to the end of the surface portion 51 has a surface that is substantially flush with the outer surface of the preceding tunnel 10b (open end of the band member accommodating portion 20).

帯部材収容部20は、先行トンネル10bの表面に形成されている。帯部材収容部20は、先行トンネル10bの表面のうち、後行トンネル10aの構築位置に対向する部分に形成され、推進方向に沿って延在している。本実施形態では、帯部材収容部20は、後行トンネル10aの構築位置に対向する表面の外側端(大断面トンネル1の外側方向の端)の角部に形成されている。帯部材収容部20は、所定深さ下がった段差形状(外側端は開放されている)を呈している。帯部材収容部20は、トンネル10の表面の外側端のスキンプレート11に形成された開口部(外側端は開放されている)の内側に、溶接固定された側板20bと底板20aとで区画されている。なお、帯部材収容部の位置は、後行トンネルに対向する表面の外側端の角部に限定されるものではなく、角部よりも内側に形成してもよい。この場合、帯部材収容部の幅方向両側に側板が設けられることとなる。   The band member accommodating portion 20 is formed on the surface of the preceding tunnel 10b. The band member accommodating portion 20 is formed in a portion of the surface of the preceding tunnel 10b facing the construction position of the succeeding tunnel 10a, and extends along the propulsion direction. In this embodiment, the band member accommodating part 20 is formed in the corner | angular part of the outer side edge (end of the outer direction of the large cross section tunnel 1) of the surface facing the construction position of the succeeding tunnel 10a. The band member accommodating portion 20 has a step shape that is lowered by a predetermined depth (the outer end is open). The band member accommodating portion 20 is partitioned by a side plate 20b and a bottom plate 20a which are welded and fixed inside an opening portion (the outer end is open) formed in the skin plate 11 at the outer end of the surface of the tunnel 10. ing. In addition, the position of the band member accommodating portion is not limited to the corner portion at the outer end of the surface facing the subsequent tunnel, and may be formed inside the corner portion. In this case, side plates will be provided on both sides in the width direction of the band member accommodating portion.

弾性帯部材50は、帯部材取付金具60によって、幅方向行両端部が係止されている。具体的には、弾性帯部材50の幅方向端部(基部55の幅方向端部)は、帯部材取付金具60の帯部材押圧板部(押圧板部)66によって、帯部材収容部20の底面側に押圧された状態で固定されている。つまり、基部55の幅方向端部の、表面部51の端面から外側に突出した部分56は、帯部材押圧板部66と帯部材収容部20の底面との間で、圧縮された状態で挟持されている。これによって、弾性帯部材50が先行トンネル10bに固定されている。   The elastic band member 50 is locked at both ends in the width direction by the band member mounting bracket 60. Specifically, the width direction end portion of the elastic band member 50 (the width direction end portion of the base portion 55) is formed by the band member pressing plate portion (pressing plate portion) 66 of the band member mounting bracket 60 of the band member housing portion 20. It is fixed in a state of being pressed to the bottom side. That is, the portion 56 protruding outward from the end surface of the surface portion 51 at the end portion in the width direction of the base portion 55 is sandwiched in a compressed state between the band member pressing plate portion 66 and the bottom surface of the band member accommodating portion 20. Has been. Thereby, the elastic band member 50 is fixed to the preceding tunnel 10b.

帯部材取付金具60は、弾性帯部材50の幅方向両端部にそれぞれ設けられている。帯部材取付金具60は、金属にて形成されている。帯部材取付金具60は、弾性帯部材50の長手方向(図1の紙面垂直方向)に沿って延在しており、ボルトB等の固定手段によって、帯部材収容部20の底面に固定されている。帯部材取付金具60は、被締付部61と帯部材押圧板部66とを備えてなる。被締付部61は、ボルトBによって締め付けられる部分であって、帯部材収容部20の底面に設置される。被締付部61には、ボルトBが挿通されるボルト貫通孔63が形成されている。ボルト貫通孔63は、推進方向に沿って所定ピッチで形成されている。一方、帯部材収容部20の底板20aにも、ボルト貫通孔21が形成されている。底板20aの裏面には、めねじ部材22が溶接固定されている。ボルト貫通孔21とめねじ部材22は同芯状に配置されている。ボルトBは、ボルト貫通孔63およびボルト貫通孔21に挿通され、その先端部がめねじ部材22に螺合される。このボルトBによって、被締付部61は、帯部材収容部20の底面に固定される。   The band member mounting bracket 60 is provided at both ends in the width direction of the elastic band member 50. The band member mounting bracket 60 is made of metal. The band member mounting bracket 60 extends along the longitudinal direction of the elastic band member 50 (perpendicular to the plane of FIG. 1), and is fixed to the bottom surface of the band member accommodating portion 20 by a fixing means such as a bolt B. Yes. The band member mounting bracket 60 includes a tightened portion 61 and a band member pressing plate portion 66. The tightened portion 61 is a portion to be tightened by the bolt B and is installed on the bottom surface of the band member accommodating portion 20. A bolt through hole 63 through which the bolt B is inserted is formed in the tightened portion 61. The bolt through holes 63 are formed at a predetermined pitch along the propulsion direction. On the other hand, a bolt through hole 21 is also formed in the bottom plate 20 a of the band member accommodating portion 20. A female screw member 22 is fixed by welding to the back surface of the bottom plate 20a. The bolt through hole 21 and the female screw member 22 are arranged concentrically. The bolt B is inserted into the bolt through hole 63 and the bolt through hole 21, and the tip portion thereof is screwed into the female screw member 22. With this bolt B, the tightened portion 61 is fixed to the bottom surface of the band member accommodating portion 20.

被締付部61の表面には、板材67が溶接固定されている。板材67は、推進方向に沿って延在しており、幅方向一端部が弾性帯部材50側に張り出している。この張り出した部分が帯部材押圧板部66を構成している。板材67には、貫通孔68が形成されている。貫通孔68は、被締付部61のボルト貫通孔63と同芯状に配置されている。貫通孔68は、ボルト貫通孔63よりも大径になっている。貫通孔68には、ボルトBの頭部が収容される。大断面トンネル1の内部側(図1中、右側)に位置する帯部材押圧板部66は、その表面が先行トンネル10bの外表面になっている。ボルトBで締め付けることで、帯部材押圧板部66は、弾性帯部材50に対向する面全体で弾性帯部材50を押圧している。   A plate material 67 is fixed to the surface of the tightened portion 61 by welding. The plate material 67 extends along the propulsion direction, and one end portion in the width direction projects to the elastic band member 50 side. This protruding portion constitutes the belt member pressing plate portion 66. A through hole 68 is formed in the plate material 67. The through hole 68 is arranged concentrically with the bolt through hole 63 of the tightened portion 61. The through hole 68 has a larger diameter than the bolt through hole 63. The head of the bolt B is accommodated in the through hole 68. The surface of the band member pressing plate portion 66 located on the inner side (the right side in FIG. 1) of the large cross-section tunnel 1 is the outer surface of the preceding tunnel 10b. By tightening with the bolt B, the band member pressing plate portion 66 presses the elastic band member 50 over the entire surface facing the elastic band member 50.

前記のような構成のトンネル間シール構造Sによれば、弾性帯部材50の基部55が硬質であるので、リップ部32に高い水圧または土圧が作用して、リップ部32が弾性帯部材50に食い込んで弾性帯部材50を押圧しても、基部55の変形を抑えることができる。つまり、図1の(b)に示すように、弾性帯部材50は、基部55が殆んど変形せず、表面部51のみが変形する。これによって、弾性帯部材50が、先行トンネル10bの帯部材収容部20から外れるのを防止できる。特に、基部55の幅方向両端部を帯部材押圧板部66で直接押さえているので、基部55が帯部材押圧板部66による押圧部分から外れ難く、弾性帯部材50の先行トンネル10bへの固定強度を高めることができる。さらに、表面部51が軟質であるので、リップ部32の先端部が表面部51に食い込んで、十分な止水性能を得られる。   According to the inter-tunnel seal structure S configured as described above, since the base portion 55 of the elastic band member 50 is hard, a high water pressure or earth pressure acts on the lip portion 32, so that the lip portion 32 becomes elastic band member 50. Even if the elastic band member 50 is pressed into the base, the deformation of the base 55 can be suppressed. That is, as shown in FIG. 1B, in the elastic band member 50, the base portion 55 is hardly deformed, and only the surface portion 51 is deformed. Thereby, it is possible to prevent the elastic band member 50 from being detached from the band member accommodating portion 20 of the preceding tunnel 10b. In particular, since both end portions in the width direction of the base portion 55 are directly pressed by the band member pressing plate portion 66, the base portion 55 is difficult to come off from the pressing portion by the band member pressing plate portion 66, and the elastic band member 50 is fixed to the preceding tunnel 10b. Strength can be increased. Furthermore, since the surface part 51 is soft, the front-end | tip part of the lip | rip part 32 bites into the surface part 51, and sufficient water stop performance is obtained.

また、表面部51と基部55とは、加硫によって接合されているので、接合強度が高く、リップ部32に高い圧力が作用した場合でも、表面部51が基部55から剥がれるのを防止できる。   Further, since the surface portion 51 and the base portion 55 are joined by vulcanization, the joining strength is high, and even when a high pressure is applied to the lip portion 32, the surface portion 51 can be prevented from being peeled off from the base portion 55.

さらに、本実施形態では、弾性シール部材30のリップ部32を硬度70とし、弾性帯部材50の表面部51を硬度50としたことで、図2に示すように、リップ部32と表面部51との間に土砂Gが咬み込んだ場合(図2の(a)参照)でも、土砂Gが軟質の表面部51に押し込まれて埋没し(図2の(b)参照)、リップ部32と表面部51とが面接触するので、水みちの発生を防止でき、止水性能を低下させることはない。   Further, in this embodiment, the lip portion 32 of the elastic seal member 30 has a hardness of 70, and the surface portion 51 of the elastic band member 50 has a hardness of 50, so that the lip portion 32 and the surface portion 51 are shown in FIG. Even when the earth and sand G bite between them (see (a) of FIG. 2), the earth and sand G is pushed into the soft surface portion 51 and buried (see (b) of FIG. 2). Since the surface portion 51 is in surface contact, it is possible to prevent the occurrence of a water channel, and the water stop performance is not deteriorated.

以上、本発明を実施するための形態について説明したが、本発明は前記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で適宜変更が可能である。例えば、前記実施形態では、弾性帯部材50は、幅方向中央部が突出した断面凸形形状となっているが、これに限定されるものではない。弾性帯部材の表面に軟質の表面部が設けられ、幅方向全体に渡って硬質の基部が設けられていれば他の形状であってもよい。なお、帯部材押圧板部66で押圧される部分は、硬質の基部で構成するのが好ましい。   As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, in the said embodiment, although the elastic strip member 50 becomes a cross-sectional convex shape which the width direction center part protruded, it is not limited to this. Other shapes may be used as long as a soft surface portion is provided on the surface of the elastic band member and a hard base portion is provided over the entire width direction. In addition, it is preferable to comprise the part pressed with the strip | belt member press board part 66 with a hard base.

S トンネル間シール構造
10a 後行トンネル
10b 先行トンネル
20 帯部材収容部
30 弾性シール部材
31 ベース部
32 リップ部
50 弾性帯部材
51 表面部
55 基部
60 帯部材取付金具
66 帯部材押圧板部(押圧板部)
S Seal structure between tunnels 10a Trailing tunnel 10b Leading tunnel 20 Band member accommodating portion 30 Elastic seal member 31 Base portion 32 Lip portion 50 Elastic band member 51 Surface portion 55 Base portion 60 Band member mounting bracket 66 Band member pressing plate (pressing plate) Part)

Claims (1)

先行トンネルとその隣に構築される後行トンネルとの間に設けられるトンネル間シール構造において、
トンネル長手方向に沿って前記後行トンネルの表面に設けられた弾性シール部材と、前記先行トンネルの表面で前記弾性シール部材に対向する位置に設けられた弾性帯部材とを備えており、
前記弾性帯部材は、基部と、この基部に積層される表面部とを備えており、
前記表面部は、前記弾性シール部材よりも軟質の材料からなり、前記基部は、前記表面部よりも硬質の材料からなり、
前記表面部は、前記基部よりも小さい幅寸法で形成され、
前記基部の幅方向両端部では、前記基部の表面が露出しており、
前記基部の幅方向両端部が取付金具の押圧板部で押さえられることで前記弾性帯部材が前記先行トンネルに固定されており、
前記基部の幅方向両端面は、前記取付金具の側面に当接するとともに、
前記表面部の幅方向両端面は、前記押圧板部の側面に当接しており、
前記弾性シール部材は、前記先行トンネル側に突出しその先端部が前記表面部に当接する
ことを特徴とするトンネル間シール構造。
In the inter-tunnel seal structure provided between the preceding tunnel and the succeeding tunnel constructed next to it,
An elastic seal member provided on the surface of the subsequent tunnel along the longitudinal direction of the tunnel, and an elastic band member provided at a position facing the elastic seal member on the surface of the preceding tunnel,
The elastic band member includes a base and a surface portion laminated on the base,
The surface portion is made of a softer material than the elastic seal member, and the base portion is made of a material harder than the surface portion,
The surface portion is formed with a width dimension smaller than the base portion,
At both ends in the width direction of the base, the surface of the base is exposed,
The elastic band member is fixed to the preceding tunnel by being pressed by the pressing plate portion of the mounting bracket at both ends in the width direction of the base,
While both end surfaces in the width direction of the base are in contact with the side surfaces of the mounting bracket,
Both end surfaces in the width direction of the surface portion are in contact with side surfaces of the pressing plate portion,
The elastic seal member protrudes toward the preceding tunnel, and a tip portion of the elastic seal member comes into contact with the surface portion.
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JPH0794079B2 (en) * 1989-11-15 1995-10-11 松下電工株式会社 Sealing structure of opening in vacuum press
ATE171758T1 (en) * 1993-01-14 1998-10-15 Phoenix Ag SEALING PROFILE FOR TUNNEL TUBE SEGMENTS, ESPECIALLY FOR FLOAT-IN ELEMENTS
JP3652760B2 (en) * 1995-11-28 2005-05-25 株式会社ブリヂストン Submerged tunnel gasket
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