JP4205615B2 - How to construct a confluence of shield tunnels - Google Patents

How to construct a confluence of shield tunnels Download PDF

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JP4205615B2
JP4205615B2 JP2004057710A JP2004057710A JP4205615B2 JP 4205615 B2 JP4205615 B2 JP 4205615B2 JP 2004057710 A JP2004057710 A JP 2004057710A JP 2004057710 A JP2004057710 A JP 2004057710A JP 4205615 B2 JP4205615 B2 JP 4205615B2
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tunnel
lining
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segment
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郁夫 大江
憲二 三戸
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Nishimatsu Construction Co Ltd
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Description

本発明は、道路トンネルなど合流部・分岐部を備えるトンネルを構築するために好適に用いられるシールドトンネルの合流部の構築方法に関する。   The present invention relates to a method for constructing a junction portion of a shield tunnel that is preferably used for constructing a tunnel including a junction portion / branching portion such as a road tunnel.

近年、地下利用の進展に伴い、地下５０ｍ程度の大深度地下空間に、道路トンネルや下水道トンネルなどを構築することが行われつつある。特に、地下利用が進展している都市部の地下空間にトンネルを構築する際には、シールド工法が有利である。
道路トンネル等の構築にあっては、本線トンネルとランプトンネル等の支線トンネルとの合流部においては、互いに寄り添う二本のシールドトンネルを一体的に連結する必要がある。この場合、路上から開削した合流部にシールドトンネルを接続する方法が考えられるが、地上の専有面積が幅、長さともに広範囲になり、問題が大きい。 In recent years, with the progress of underground use, construction of road tunnels, sewer tunnels, etc. is being carried out in a deep underground space of about 50 m underground. In particular, the shield method is advantageous when building tunnels in underground spaces in urban areas where underground use is advancing.
In the construction of a road tunnel or the like, it is necessary to integrally connect two shield tunnels close to each other at the junction of the main tunnel and a branch tunnel such as a ramp tunnel. In this case, a method of connecting a shield tunnel to a converging part excavated from the road is conceivable, but the exclusive area on the ground is wide in both width and length, which is a serious problem.

そこで、地上の専有面積を小さくするために、支線トンネル用のシールド機を投入する立坑を構築し、この立坑内で本線トンネル用のシールド機と合体させ合流部を掘進し、合流部を掘削後に分岐する方法が考えられている。また、突起を設けたシールド機によって、先行シールドトンネルと後続シールドトンネルとの対向する箇所にそれぞれ上部及び下部に外方に突起部を形成した覆工体を設置し、それぞれの上部及び下部の突起部間のセグメントを撤去して接合するシールドトンネル間の接合方法が開示されている（例えば、特許文献１参照。）。
特許第２７５５７７２号公報 Therefore, in order to reduce the exclusive area on the ground, a shaft was installed to introduce a shield machine for the branch tunnel, and the junction was merged with the shield machine for the main tunnel in this shaft, and the junction was excavated. A method of branching is considered. In addition, by using a shield machine provided with protrusions, lining bodies with protrusions formed on the upper and lower sides are installed at the locations where the preceding shield tunnel and the subsequent shield tunnel face each other, and the upper and lower protrusions are respectively provided. A method for joining shield tunnels in which segments between parts are removed and joined is disclosed (for example, see Patent Document 1).
Japanese Patent No. 2755772

しかしながら、前者の方法では、合流部の全範囲を開削する必要はないが、立坑部分を開削する必要があり、地上部分を専有することに変わりはない。また、シールドトンネルの構築位置が大深度になるに従い、その構築費が高くなる。後者の方法では、地上から開削する必要はないが、シールド機の構造を突起部を形成するような特殊なものにしなければならず、その機械費が高くなる。また、従来の方法では、本線トンネルが供用されている場合に、その供用を中止することなく、支線トンネルを構築して合流させることは困難であった。   However, in the former method, it is not necessary to excavate the entire range of the merging portion, but it is necessary to excavate the shaft portion, and there is no change to occupying the ground portion. Moreover, as the construction position of the shield tunnel increases, the construction cost increases. In the latter method, it is not necessary to excavate from the ground, but the structure of the shield machine must be made special so as to form the protrusions, which increases the machine cost. Further, in the conventional method, when the main tunnel is in service, it is difficult to construct and join the branch tunnel without stopping the service.

本発明の課題は、地上から開削することなく、シールド機に工夫を必要とせず、シールドトンネルの合流部を構築することである。また、合流される本線トンネルを供用しながら、シールドトンネルの合流部を構築することである。   An object of the present invention is to construct a junction part of a shield tunnel without excavating from the ground and without requiring any ingenuity in the shield machine. In addition, it is to construct the junction part of the shield tunnel while using the main tunnel to be joined.

以上の課題を解決するため、請求項１に記載の発明は、例えば図１に示すように、シールド工法によってそれぞれ構築される本線トンネルと支線トンネルとの合流部を構築するためのシールドトンネルの構築方法であって、前記合流部の区間において、前記本線トンネルと前記支線トンネルとを互いに寄り添うように掘進すると共に、それぞれ外枠セグメントとその中に移動自在に配置した移動セグメントからなる突起付きセグメントを上部及び下部に含むほぼ円形の覆工を組み立てて、次いで、前記本線トンネルと前記支線トンネルとを分け隔てる前記覆工の一部を除去して地山を掘削することにより連続させると共に、前記突起付きセグメントの外枠セグメントから移動セグメントを押し出して、本線トンネルと支線トンネルの上部及び下部に突起を形成し、これらの突起部間に架け渡すように鋼殻を取り付け、この鋼殻と前記覆工の間の空間に充填材を充填して本線トンネルと支線トンネルの覆工を一体化させ、これら本線トンネルと支線トンネルと鋼殻からなる覆工の断面の包絡線がほぼ円形になるようにすることを特徴とする。
ここで、上記「ほぼ円形」とは、正円形の他、楕円形や長円形等を指す。 In order to solve the above-described problems, the invention described in claim 1 is, for example, as shown in FIG. 1, construction of a shield tunnel for constructing a junction between a main tunnel and a branch tunnel respectively constructed by a shield method. In the section of the merge section, the main tunnel and the branch tunnel are dug so as to be close to each other, and a protruding segment comprising an outer frame segment and a movable segment movably disposed therein is provided. Assembling a substantially circular lining including an upper part and a lower part, and then removing a part of the lining that separates the main line tunnel and the branch line tunnel and excavating a natural ground, The moving segment is pushed out from the outer frame segment of the attached segment, and the upper part of the main and branch tunnels and Protrusions are formed on the part, and a steel shell is attached so as to bridge between these protrusions, and the space between the steel shell and the lining is filled with a filler, so that the main tunnel and the branch tunnel lining are integrated. It is characterized in that the envelope of the cross section of the lining composed of the main tunnel, the branch tunnel and the steel shell is substantially circular.
Here, the “substantially circular” refers to an elliptical shape, an oval shape, etc. in addition to a regular circular shape.

このように、本線トンネルと支線トンネルとの合流部の区間において、これら本線トンネルと支線トンネルとを互いに寄り添うように掘進すると共に、それぞれ外枠セグメントとその中に移動自在に配置した移動セグメントからなる突起付きセグメントを上部及び下部に含むほぼ円形の覆工を組み立てて、次いで、前記本線トンネルと前記支線トンネルとを分け隔てる前記覆工の一部を除去して地山を掘削することにより連続させると共に、前記突起付きセグメントの外枠セグメントから移動セグメントを押し出して、本線トンネルと支線トンネルの上部及び下部に突起を形成し、これらの突起部間に架け渡すように鋼殻を取り付け、この鋼殻と前記覆工の間の空間に充填材を充填して本線トンネルと支線トンネルの覆工を一体化させるので、地上から開削することなく、シールド機に工夫を必要とせず、それらのコストを削減することができる。また、合流される本線トンネルを供用しながら、シールドトンネルの合流部を構築することができる。
また、本線トンネルと支線トンネルと鋼殻の覆工の断面の包絡線がほぼ円形になるようにすることにより、本線トンネルと支線トンネルとの合流部の断面を力学的に安定的なほぼ円形断面の形状に構築することができるので、特に大きな土圧を受ける大深度の地下空間において、本線トンネルと支線トンネルとの合流部を構築するのに適している。 In this way, in the section of the junction of the main line tunnel and the branch line tunnel, the main line tunnel and the branch line tunnel are dug so as to be close to each other, and each consists of an outer frame segment and a moving segment movably disposed therein. Assemble a substantially circular lining that includes protruding segments at the top and bottom, and then continue by excavating a natural ground by removing a portion of the lining that separates the main tunnel and the branch tunnel In addition, the moving segment is pushed out from the outer frame segment of the protruding segment to form protrusions at the upper and lower portions of the main line tunnel and the branch line tunnel, and a steel shell is attached so as to be bridged between these protrusions. And filling the space between the lining and the lining of the main tunnel and the branch tunnel. Without digging the ground, without the need for devising the shield machine can be reduced their cost. In addition, the merging part of the shield tunnel can be constructed while using the merged main tunnel.
In addition, by making the envelope of the cross section of the main tunnel, the branch tunnel, and the steel shell lining substantially circular, the cross section of the junction of the main tunnel and the branch tunnel is a substantially circular cross section that is mechanically stable. Therefore, it is suitable for constructing a junction between a main tunnel and a branch tunnel in a deep underground space that receives a large earth pressure.

請求項１に記載の発明によれば、本線トンネルと支線トンネルとの合流部の区間において、これら本線トンネルと支線トンネルとを互いに寄り添うように掘進すると共に、それぞれ外枠セグメントとその中に移動自在に配置した移動セグメントからなる突起付きセグメントを上部及び下部に含むほぼ円形の覆工を組み立てて、次いで、前記本線トンネルと前記支線トンネルとを分け隔てる前記覆工の一部を除去して地山を掘削することにより連続させると共に、前記突起付きセグメントの外枠セグメントから移動セグメントを押し出して、本線トンネルと支線トンネルの上部及び下部に突起を形成し、これらの突起部間に架け渡すように鋼殻を取り付け、この鋼殻と前記覆工の間の空間に充填材を充填して本線トンネルと支線トンネルの覆工を一体化させるので、地上から開削することなく、シールド機に工夫を必要とせず、それらのコストを削減することができる。また、合流される本線トンネルを供用しながら、シールドトンネルの合流部を構築することができる。   According to the first aspect of the present invention, in the section of the junction between the main line tunnel and the branch line tunnel, the main line tunnel and the branch line tunnel are dug so as to be close to each other, and the outer frame segment and each of the outer frame segments are freely movable therein. Assembling a substantially circular lining including protruding segments made up of moving segments arranged in the upper and lower parts, and then removing a part of the lining separating the main tunnel and the branch tunnel, , And the moving segment is pushed out from the outer frame segment of the segment with protrusions to form protrusions at the upper and lower portions of the main tunnel and the branch tunnel, and the steel is bridged between these protrusions. A shell is attached and the space between this steel shell and the lining is filled with a filler, and the main tunnel and the branch tunnel lining are covered. Because be integrated without digging the ground, without the need for devising the shield machine can be reduced their cost. In addition, the merging part of the shield tunnel can be constructed while using the merged main line tunnel.

以下、図を参照して本発明を実施するための最良の形態を詳細に説明する。
本実施の形態のシールドトンネルの合流部の構築方法は、地下に建設される道路トンネルの本線トンネルＴ１とランプトンネル（支線トンネル）Ｔ２とをそれぞれ掘進すると共に、その合流部ＴＪを構築するために適用されるものである。 Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
The construction method of the junction part of the shield tunnel according to the present embodiment is for digging each of the main tunnel T1 and the ramp tunnel (branch line tunnel) T2 of the road tunnel constructed underground, and for constructing the junction part TJ. Applicable.

図１に示すように、本線トンネルＴ１は、およそ地下５０ｍの深さに設けられる片側３車線の道路トンネルであり、既に供用を開始している。ランプトンネルＴ２は、本線トンネルＴ１の入口車線および出口車線として設けられるトンネルである。   As shown in FIG. 1, the main tunnel T1 is a one-sided three-lane road tunnel provided at a depth of about 50 m underground, and has already started operation. The ramp tunnel T2 is a tunnel provided as an entrance lane and an exit lane of the main tunnel T1.

本線トンネルＴ１及びランプトンネルＴ２は、従来からの標準的なシールド機を用いて標準的な覆工方法により構築され、その断面は標準的な円形断面である。本発明の特徴として、図１に示すように、その覆工の一部に、すなわち覆工１、２の上部及び下部に突起付きセグメント３，４を含んで構築される。   The main tunnel T1 and the lamp tunnel T2 are constructed by a standard lining method using a conventional standard shield machine, and the cross section is a standard circular cross section. As a feature of the present invention, as shown in FIG. 1, it is constructed by including protruding segments 3 and 4 at a part of the lining, that is, at the upper and lower portions of the linings 1 and 2.

本線トンネルＴ１の覆工１の突起付きセグメント３は、図２、３に示すように、鋼製の外枠セグメント３ｂ及び移動セグメント（突起部）３ａと、ダミー部材で構成されている。外枠セグメント３ｂは、トンネルの外方と内方に向かって開放された枠状のものであり、覆工の一部をなして覆工の断面を円形に形成している。移動セグメント３ａは、その上部が突起状に形成され、外枠セグメント３ｂ内に収納されている。ダミー部材３ｃ、３ｄは、移動セグメント３ａと外枠セグメント３ｂの隙間を埋める部材である。ダミー部材３ｂが取り付けられることにより、シールド機に特別なテールシールを用いることなく、掘進時に水や土砂が浸入することを防止することができる。支線トンネルＴ２の覆工２の突起付きセグメント４の仕組みは、本線トンネルＴ１と同様である。   As shown in FIGS. 2 and 3, the segment 3 with projections of the lining 1 of the main tunnel T1 is composed of a steel outer frame segment 3b, a moving segment (projection) 3a, and a dummy member. The outer frame segment 3b has a frame shape opened toward the outer side and the inner side of the tunnel, and forms a part of the lining to form a circular cross section of the lining. The upper part of the moving segment 3a is formed in a protruding shape and is accommodated in the outer frame segment 3b. The dummy members 3c and 3d are members that fill a gap between the moving segment 3a and the outer frame segment 3b. By attaching the dummy member 3b, it is possible to prevent water and earth and sand from entering during excavation without using a special tail seal for the shield machine. The structure of the protruding segment 4 of the lining 2 of the branch tunnel T2 is the same as that of the main tunnel T1.

外枠セグメント３ｂの内側面には、外側セグメント３ｂと移動セグメント３ａを接合するための接合部材３ｆが取り付けられている。また、移動セグメント３ａの外側面との間を止水するためのシール部材３ｅが取り付けられている。   A joining member 3f for joining the outer segment 3b and the moving segment 3a is attached to the inner side surface of the outer frame segment 3b. Further, a sealing member 3e for stopping water between the outer surface of the moving segment 3a is attached.

移動セグメント３ａは、ダミー部材３ｄにより自由な形状の突起とすることができる。そして、移動セグメント３ａとダミー部材３ｄは、矩形形状をなすため、トンネルの外方へ押し出すことが容易であり、止水も簡単にできる。   The moving segment 3a can be a free-form protrusion by the dummy member 3d. Since the moving segment 3a and the dummy member 3d have a rectangular shape, they can be easily pushed out of the tunnel and water can be stopped easily.

本実施の形態のシールドトンネルの合流部の構築方法の手順を説明する。
互いに並行するように構築された本線トンネルＴ１とランプトンネルＴ２の覆工１，２内部に、図１（ｂ）に示すように、本線トンネルＴ１において車両の走行を妨げないように支保工６を設置する。また、本線トンネルＴ１とランプトンネルＴ２の覆工１，２間の上下の部分の地山に対して、地盤改良材注入、地盤凍結等により地盤改良７を施す。 The procedure of the construction method of the junction part of the shield tunnel of this Embodiment is demonstrated.
In the linings 1 and 2 of the main tunnel T1 and the ramp tunnel T2 constructed so as to be parallel to each other, as shown in FIG. 1 (b), a supporting work 6 is installed so as not to prevent the vehicle from traveling in the main tunnel T1. Install. Further, the ground improvement 7 is applied to the upper and lower ground between the linings 1 and 2 of the main tunnel T1 and the ramp tunnel T2 by injecting ground improvement material, freezing the ground, or the like.

そして、本線トンネルＴ１とランプトンネルＴ２の間の覆工１，２を構成するセグメントの一部を取り外すとともに地山を掘削し、二本のトンネルＴ１，Ｔ２を横方向に連続させる。   Then, a part of the segments constituting the linings 1 and 2 between the main tunnel T1 and the ramp tunnel T2 is removed and a natural ground is excavated, so that the two tunnels T1 and T2 are continued in the lateral direction.

次に、突起付きセグメント３、４の移動セグメント３ａ，４ａを、ジャッキ等によりトンネル内側から押し出して、覆工の上部及び下部に突起を形成する。そして、本線トンネルＴ１と支線トンネルＴ２の覆工１，２の上方と下方とに、移動セグメント３ａ，４ａの突起部間に架け渡すように鋼殻５を取り付け、覆工１，２の間を覆うようにして配置する。このとき、図３（ｂ）に示すように、止水性を高めるために、鋼殻５に部材５ａを取り付け、部材５ａと突起付きセグメント３，４との間にシール部材５ｂを設置することが望ましい。   Next, the moving segments 3a and 4a of the segments 3 and 4 with protrusions are pushed out from the inside of the tunnel with a jack or the like to form protrusions on the upper and lower sides of the lining. And the steel shell 5 is attached to the upper and lower sides of the linings 1 and 2 of the main tunnel T1 and the branch tunnel T2 so as to be bridged between the projections of the moving segments 3a and 4a. Arrange to cover. At this time, as shown in FIG. 3 (b), in order to increase the water-stopping property, the member 5a is attached to the steel shell 5, and the seal member 5b is installed between the member 5a and the segments 3 and 4 with projections. desirable.

鋼殻５と覆工１，２の間の空間にコンクリートからなる充填材７を充填して、本線トンネルＴ１とランプトンネルＴ２との覆工１，２を一体化する。この一体化は、本線トンネルＴ１と支線トンネルＴ２と鋼殻５とからなる覆工の断面の包絡線がほぼ円形になるようにする。その後、支保工６を取り外す。これにより、本線トンネルＴ１とランプトンネルＴ２との合流部ＴＪの覆工の断面がほぼ円形となり、力学的に安定したものとなる。このようにして、本線トンネルＴ１とランプトンネルＴ２との合流部ＴＪの覆工が完成する。   The space between the steel shell 5 and the linings 1 and 2 is filled with a filler 7 made of concrete, and the linings 1 and 2 of the main tunnel T1 and the lamp tunnel T2 are integrated. This integration is performed so that the envelope of the cross section of the lining composed of the main line tunnel T1, the branch line tunnel T2, and the steel shell 5 becomes substantially circular. Then, the support work 6 is removed. As a result, the cross section of the lining portion of the junction TJ between the main tunnel T1 and the lamp tunnel T2 becomes substantially circular, and is mechanically stable. In this way, the lining of the junction TJ between the main tunnel T1 and the ramp tunnel T2 is completed.

なお、本発明の本線トンネル及び支線トンネルの断面形状を円形としたが、上記の実施の形態に限定されることなく、合流部の断面形状がほぼ円形になるものであればよく、例えば楕円形等であってもよい。
また、上記の実施の形態では、道路トンネルの本線とランプを掘進すると共にその合流部を構築しているが、分岐部や拡幅部を備える鉄道トンネルや下水道トンネル等を構築する際にも本発明のシールドトンネルの合流部の構築方法を適用可能である。
また、具体的な細部構造等についても適宜に変更可能であることは勿論である。 In addition, although the cross-sectional shape of the main line tunnel and the branch line tunnel of the present invention is circular, it is not limited to the above-described embodiment, and any cross-sectional shape of the merging portion may be substantially circular, for example, oval Etc.
Further, in the above embodiment, the main road and the ramp of the road tunnel are dug and the junction portion is constructed, but the present invention is also provided when constructing a railway tunnel, a sewer tunnel, etc. having a branching portion and a widening portion. It is possible to apply the construction method of the confluence of shield tunnels.
Needless to say, the specific detailed structure and the like can be changed as appropriate.

本発明を適用した一実施の形態のシールドトンネルの合流部の構築状況を示す断面図である。It is sectional drawing which shows the construction condition of the junction part of the shield tunnel of one Embodiment to which this invention is applied. 本発明を適用した一実施の形態のシールドトンネルの合流部の構築において、突出式セグメントの押出し状況を示す断面詳細図である。It is a cross-sectional detail drawing which shows the extrusion condition of a protrusion-type segment in construction of the junction part of the shield tunnel of one Embodiment to which this invention is applied. 本発明を適用した一実施の形態のシールドトンネルの合流部の構築において、突出式セグメントが押出された後の覆工の状況を示す斜視図である。It is a perspective view which shows the condition of the lining after a protrusion-type segment is extruded in construction | assembly of the junction part of the shield tunnel of one Embodiment to which this invention is applied.

符号の説明Explanation of symbols

１ 、２ 覆工
３ 、４ 突起付きセグメント
５ 鋼殻
６ 支保工
Ｔ１ 本線トンネル
Ｔ２ 支線トンネル
ＴＪ 合流部 1, 2 lining 3, 4 segment 5 with projection 5 steel shell 6 support T1 main tunnel T2 branch tunnel TJ junction

Claims (1)

シールド工法によってそれぞれ構築される本線トンネルと支線トンネルとの合流部を構築するためのシールドトンネルの構築方法であって、
前記合流部の区間において、前記本線トンネルと前記支線トンネルとを互いに寄り添うように掘進すると共に、それぞれ外枠セグメントとその中に移動自在に配置した移動セグメントからなる突起付きセグメントを上部及び下部に含むほぼ円形の覆工を組み立てて、
次いで、前記本線トンネルと前記支線トンネルとを分け隔てる前記覆工の一部を除去して地山を掘削することにより連続させると共に、前記突起付きセグメントの外枠セグメントから移動セグメントを押し出して、本線トンネルと支線トンネルの上部及び下部に突起を形成し、これらの突起部間に架け渡すように鋼殻を取り付け、この鋼殻と前記覆工の間の空間に充填材を充填して本線トンネルと支線トンネルの覆工を一体化させ、
これら本線トンネルと支線トンネルと鋼殻とからなる覆工の断面の包絡線がほぼ円形になるようにすることを特徴とするシールドトンネルの合流部の構築方法。 A shield tunnel construction method for constructing a junction between a main tunnel and a branch tunnel respectively constructed by a shield method,
In the section of the merge section, the main tunnel and the branch tunnel are dug so as to be close to each other, and each includes an outer frame segment and a segment with a protrusion that is movably disposed in the upper and lower segments. Assemble an almost circular lining,
Next, a part of the lining that separates the main line tunnel and the branch line tunnel is removed to continue by excavating a natural ground, and a moving segment is pushed out from an outer frame segment of the protruding segment, Protrusions are formed on the upper and lower parts of the tunnel and the branch tunnel, and a steel shell is attached so as to be bridged between these protrusions, and the space between the steel shell and the lining is filled with a filler, and the main tunnel Integrate the lining of the branch tunnel,
A method for constructing a confluence of shield tunnels, characterized in that the envelope of the cross section of the lining consisting of the main tunnel, the branch tunnel and the steel shell is substantially circular.
JP2004057710A 2004-03-02 2004-03-02 How to construct a confluence of shield tunnels Expired - Fee Related JP4205615B2 (en)

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JP4397797B2 (en) * 2004-11-29 2010-01-13 鹿島建設株式会社 Construction method of underground structure
JP4566914B2 (en) * 2006-01-06 2010-10-20 大成建設株式会社 Method of constructing rejoined segments and connected tunnels
JP4828286B2 (en) * 2006-04-07 2011-11-30 新日本製鐵株式会社 Segment connection structure and layout structure
JP4912726B2 (en) * 2006-04-07 2012-04-11 新日本製鐵株式会社 Connection structure between segment rings
JP5106802B2 (en) * 2006-07-07 2012-12-26 西松建設株式会社 Widening part construction method of tunnel
JP4625796B2 (en) * 2006-10-16 2011-02-02 大成建設株式会社 Multiple arc tunnel connection structure and construction method
JP4912839B2 (en) * 2006-11-15 2012-04-11 大成建設株式会社 Multiple arc-shaped tunnel construction method and tunnel-joint connection structure
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JP4782704B2 (en) * 2007-01-09 2011-09-28 株式会社間組 Widening structure of shield tunnel, shield tunnel segment and shield tunnel widening method
JP4958040B2 (en) * 2007-01-10 2012-06-20 清水建設株式会社 Tunnel structure and tunnel construction method
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