JP2006002460A - Tunnel forming method - Google Patents

Tunnel forming method Download PDF

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JP2006002460A
JP2006002460A JP2004180750A JP2004180750A JP2006002460A JP 2006002460 A JP2006002460 A JP 2006002460A JP 2004180750 A JP2004180750 A JP 2004180750A JP 2004180750 A JP2004180750 A JP 2004180750A JP 2006002460 A JP2006002460 A JP 2006002460A
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tunnel
main
branch line
line tunnel
line
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JP4229880B2 (en
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Masahiro Hayashi
正博 林
Yoshihiko Matsui
芳彦 松井
Atsushi Tokumaru
敦 徳丸
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Maeda Corp
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Maeda Corp
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  • Lining And Supports For Tunnels (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a construction period by forming a branch tunnel from a main tunnel in a short period. <P>SOLUTION: The main tunnel 1 is provided with the branch tunnel 3. In this case, the branch tunnel 3 is formed in advance with a shield driving method and then an intersection planed section 200 penetrating between the branch tunnel 3 and the main tunnel 1 is formed by a shield machine 50 in exclusive use for the main tunnel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、道路用や鉄道用の本線トンネルに対して分岐線トンネルを合流または分岐させるトンネル形成技術に関する。   The present invention relates to a tunnel formation technique for joining or branching a branch line tunnel to a main tunnel for roads or railways.

例えば道路用の本線トンネルに対して分岐するランプウェイトンネル等の分岐線トンネルを形成する技術として、地上において直接土砂を掘削し、管やセグメントを埋めていく開削工法が周知である。しかしながら、沿道の環境から開削工法が採用できない場合が少なくない。   For example, as a technique for forming a branch line tunnel such as a rampway tunnel that branches off from a main line tunnel for roads, an open-cut method for excavating soil directly on the ground and filling pipes and segments is well known. However, there are many cases where the excavation method cannot be adopted due to the roadside environment.

そこで、開削工法が採用できない場合、シールドマシンにより地中を掘り進み、その後方でセグメントを組み立ててトンネルを施工するシールド工法を採用することが、近年一般的になりつつある。ところでこれまでは、シールド工法で本線トンネルを構築後、本線トンネルに用いたシールドマシーンとは別のシールドマシーンを用いて本線トンネルの内側から外側に向けて分岐線トンネルを掘削することが提案されている。また、その場合、これに先立って、分岐線トンネル用のシールドマシーンは狭い本線トンネル内で組み立ててる必要がある。トンネル内は限られたスペースであり、よって作業性が悪く組み立てに時間が掛かり、工期短縮化の妨げとなる。   Therefore, when the open-cut method cannot be adopted, it is becoming common in recent years to adopt a shield method in which the tunnel is constructed by digging the ground with a shield machine and assembling the segments behind it. By the way, until now, after constructing the main tunnel with the shield method, it has been proposed to excavate the branch line tunnel from the inside to the outside of the main tunnel using a shield machine different from the shield machine used for the main tunnel. Yes. In this case, prior to this, the shield machine for the branch line tunnel must be assembled in the narrow main line tunnel. The inside of the tunnel is a limited space, so the workability is poor and the assembly takes time, which hinders shortening the construction period.

本発明はこのような実情に鑑みて為されたものであり、その解決しようとする課題は、これまでよりも工期を短縮することができるトンネル形成方法を提供することにある。   The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is to provide a tunnel forming method capable of shortening the construction period more than before.

前記した課題を解決するために、本発明のトンネル形成方法は以下の手段を採用した。   In order to solve the above problems, the tunnel forming method of the present invention employs the following means.

すなわち本発明のトンネル形成方法は、分岐線トンネルが形成される本線トンネルを設けるにあたり、先に分岐線トンネルをシールド工法で形成後、分岐線トンネルと本線トンネルとの交差予定箇所を本線トンネル専用のシールドマシーンで貫通し、本線トンネルを設けるというものである。   That is, in the tunnel forming method of the present invention, when the main line tunnel for forming the branch line tunnel is provided, the branch line tunnel is first formed by the shield method, and the planned intersection of the branch line tunnel and the main line tunnel is designated for the main line tunnel. It penetrates with a shield machine and establishes a main tunnel.

本発明によれば、本線トンネルよりも先に分岐線トンネルを形成するが、分岐線トンネルの形成にあたり、分岐線トンネル形成用のシールドマシーンを予め地上にて組み立てておき、地上を起点としてそこから掘削し分岐線トンネルを形成することができる。   According to the present invention, the branch line tunnel is formed prior to the main line tunnel. In forming the branch line tunnel, a shield machine for forming the branch line tunnel is assembled on the ground in advance, and the ground is the starting point from there. It can be excavated to form a branch line tunnel.

よって、本発明によれば、狭いトンネル内で、分岐線トンネル用のシールドマシーンを組み立てる必要がない分、工期を短縮できる。   Therefore, according to the present invention, the construction period can be shortened because it is not necessary to assemble a shield machine for a branch line tunnel in a narrow tunnel.

以下、本発明の実施の形態（以下、実施形態）を添付した図面を参照して説明する。   Hereinafter, embodiments of the present invention (hereinafter, embodiments) will be described with reference to the accompanying drawings.

本実施形態を地下に敷設される自動車専用道路に適用する場合として例示する。   This embodiment will be exemplified as a case where the present embodiment is applied to an automobile exclusive road laid underground.

図１は、地中内における工事中の自動車専用道路Ｉの一部区間の概略平面図である。この自動車専用道路は、本線トンネル１と、分岐線トンネル３とを有し、本線トンネル１は
上り車線（）１１および下り車線１２を有する。図示する矢印は車の走行方向を示す。また図２は図１の側面図である。また図３及び図４は共に図１の断面図であり、図３は図１のＡ−Ａ線の図４は図１のＢ−Ｂ線の断面図である。 FIG. 1 is a schematic plan view of a partial section of an automobile exclusive road I under construction in the ground. This automobile exclusive road has a main line tunnel 1 and a branch line tunnel 3, and the main line tunnel 1 has an up lane () 11 and a down lane 12. The arrows shown in the figure indicate the traveling direction of the car. FIG. 2 is a side view of FIG. 3 and 4 are both cross-sectional views of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along line BB in FIG.

図１において、直線状に延びている本線トンネル１に対し、分岐線トンネル３は、Ｕの字を横倒しにしたごとき形態をしている。また、分岐線トンネル３は、本線トンネル１をその両側から挟み込むような形態となっている。分岐線トンネル３のうち、本線トンネル１の上り車線１１に対して分岐するランプウェイトンネルおよび下り車線１２に対して合流するランプウェイトンネルをそれぞれ符号３１および３２で示す。   In FIG. 1, the branch line tunnel 3 has a form in which the letter U is laid sideways with respect to the main line tunnel 1 extending linearly. Further, the branch line tunnel 3 is configured to sandwich the main line tunnel 1 from both sides thereof. Of the branch line tunnel 3, reference numerals 31 and 32 denote a ramp way tunnel that branches to the upstream lane 11 of the main tunnel 1 and a ramp way tunnel that merges to the downstream lane 12, respectively.

このような分岐線トンネル３を有する本線トンネル１を敷設するには、本線トンネル１よりも先に分岐線トンネル３を敷設する。分岐線トンネル３の敷設にはシールド工法を用いるが、図１からわかるように、地上において、符号３００で示す立坑および開削区間を本線トンネル１の両側に設け、一方の立坑および開削区間３００を起点にして、そこから本線トンネル１と分岐線トンネル３とが交差する交差予定箇所２００を経由した後、他方の立坑および開削区間３００に到るまで、分岐線トンネル用のシールドマシーン４０を一気に折返し運転させる。   In order to lay the main line tunnel 1 having such a branch line tunnel 3, the branch line tunnel 3 is laid before the main line tunnel 1. Although a shield method is used for laying the branch line tunnel 3, as can be seen from FIG. 1, on the ground, a shaft and an excavation section indicated by reference numeral 300 are provided on both sides of the main tunnel 1, and one of the shafts and the excavation section 300 is the starting point. After that, after passing through the planned intersection 200 where the main line tunnel 1 and the branch line tunnel 3 intersect, until the other shaft and the excavation section 300 are reached, the shield machine 40 for the branch line tunnel is turned back at once. Let

シールドマシーン４０は、地上にて予め組み立てておいたものである。分岐線トンネル３の形成後、本線トンネル専用のシールドマシーン５０，５０で本線トンネル１の上り・下り線１１及び１２を掘削する。また、分岐線トンネル３と本線トンネル１との交差予定箇所２００を本線トンネル専用のシールドマシーン５０で貫通する。   The shield machine 40 is assembled in advance on the ground. After the branch line tunnel 3 is formed, the upstream and downstream lines 11 and 12 of the main tunnel 1 are excavated by shield machines 50 and 50 dedicated to the main tunnel. Moreover, the intersection 200 between the branch line tunnel 3 and the main line tunnel 1 is penetrated by a shield machine 50 dedicated to the main line tunnel.

交差予定箇所２００を本線トンネル専用のシールドマシーン５０で掘削するにあたり、交差予定箇所２００内をコンクリートで充填しておく。当該コンクリートは、発泡剤を用いたコンクリートであってもよいし、焼成粘土のような人工骨材、火山礫およびその加工品等を用いて比較的切削を容易にできるようにしたものでもよい。なお、交差予定箇所２００は、Ｕ字形の分岐線トンネル３の折返し部分であり、符号２００を折返し部分を示唆する符号として適用する場合がある。   When the planned intersection 200 is excavated by the shield machine 50 dedicated to the main tunnel, the planned intersection 200 is filled with concrete. The concrete may be concrete using a foaming agent, or may be made relatively easy to cut using artificial aggregates such as calcined clay, volcanic gravel and processed products thereof. The planned intersection 200 is a folded portion of the U-shaped branch line tunnel 3, and the code 200 may be applied as a code that suggests the folded portion.

また、分岐線トンネル３のセグメントは、本線トンネル用のシールドマシーン５０による分岐線トンネル３の切削が可能なように、カーボン繊維，ガラス繊維，アラミド繊維またはビニロンのうちのいずれかを樹脂に含浸してなる棒状，板状，Ｌ形，Ｔ形，溝形，円筒，角筒等の成形材またはその短いファイバまたはスチールファイバを用いて補強したコンクリート構造のセグメントを利用する。また、交差予定箇所２００はコンクリートで充填し中実にしてある。よって、交差予定箇所２００は、これを構成するセグメントが中実状態であるからその周囲の地盤と比較して強度上遜色ない。よって、本線トンネル専用のシールドマシーン５０で既設の分岐線トンネル３の折返し部分である交差予定箇所２００内を掘削しても分岐線トンネル３に極度の集中応力が生じることはない。このため、交差予定箇所２００の掘削をシールドマシーン５０による他の地盤の掘削と同様に実行でき、両者は均質化する。   Further, the segment of the branch line tunnel 3 is impregnated with one of carbon fiber, glass fiber, aramid fiber, or vinylon so that the branch line tunnel 3 can be cut by the shield machine 50 for the main line tunnel. A rod-shaped, plate-shaped, L-shaped, T-shaped, groove-shaped, cylindrical, rectangular tube or other shaped material, or a segment of a concrete structure reinforced with its short fiber or steel fiber is used. The planned intersection 200 is filled with concrete and solid. Therefore, the planned intersection 200 is not inferior in strength compared to the surrounding ground because the segments constituting it are in a solid state. Therefore, even if the inside of the planned intersection 200, which is a folded portion of the existing branch line tunnel 3, is excavated by the shield machine 50 dedicated to the main line tunnel, no extreme concentrated stress is generated in the branch line tunnel 3. Therefore, excavation of the planned intersection 200 can be performed in the same manner as excavation of other ground by the shield machine 50, and both are homogenized.

本実施形態によれば、本線トンネル１よりも先に分岐線トンネル３を形成するが、分岐線トンネル３の形成にあたり、上り車線１１のランプウェイトンネル３１および下り車線１２のランプウェイトンネル３２の両方をシールドマシーン４０にて一気に掘り進むことができる。このため、それだけでも工期を短縮できるが、これまでのように、狭いトンネル内で、分岐線トンネル用のシールドマシーンを組み立てる必要がないので、それによっても工期を短縮できる。   According to the present embodiment, the branch line tunnel 3 is formed before the main line tunnel 1. In forming the branch line tunnel 3, both the ramp way tunnel 31 of the up lane 11 and the ramp way tunnel 32 of the down lane 12 are used. Can be dug on the shield machine 40 at once. For this reason, the construction period can be shortened by itself, but since it is not necessary to assemble a shield machine for a branch line tunnel in a narrow tunnel as before, the construction period can also be shortened.

本実施形態では、Ｕ字形の分岐線トンネル３の折返し部分２００で本線トンネル１を交
差させたので、上り車線１１のランプウェイトンネル３１は上り車線１１から分岐し、下り車線１２のランプウェイトンネル３２は下り車線１２と合流する形態となるけれでも、図５に示すように、本線トンネル１に対し分岐線トンネル３が斜めに交差する形態にすることで、上り車線１１のランプウェイトンネル３１も下り車線１２のランプウェイトンネル３２も共に本線トンネル１に対して分離するランプウェイトンネルとなる。この場合、交差予定箇所２００も本線トンネル１に対し斜めに形成される。なお、本線トンネルおよび分岐線トンネルの形状は上記の形状に限定されない。 In the present embodiment, since the main tunnel 1 is crossed at the folded portion 200 of the U-shaped branch line tunnel 3, the ramp way tunnel 31 of the up lane 11 branches from the up lane 11 and the ramp way tunnel 32 of the down lane 12. However, as shown in FIG. 5, when the branch line tunnel 3 is obliquely intersected with the main tunnel 1, the rampway tunnel 31 of the upstream lane 11 is also descended. The rampway tunnel 32 of the lane 12 is also a rampway tunnel that is separated from the main tunnel 1. In this case, the planned intersection 200 is also formed obliquely with respect to the main tunnel 1. The shapes of the main line tunnel and the branch line tunnel are not limited to the above shapes.

なお、本発明は上述の図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種種変更を加え得ることは勿論である。   In addition, this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

地中内における工事中の自動車専用道路の一部区間の平面概略図である。It is a plane schematic diagram of a partial section of an automobile exclusive road under construction in the ground. 図１の側面図である。It is a side view of FIG. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 図１のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 図２に相当し、本線トンネルに対し分岐線トンネルを斜めに交差させた場合を示す図である。FIG. 3 corresponds to FIG. 2 and shows a case where a branch line tunnel is obliquely intersected with a main line tunnel.

符号の説明Explanation of symbols

Ｉ 自動車専用道路
１ 本線トンネル
３ 分岐線トンネル
１１ 上り車線
１２ 下り車線
３１ 上り車線のランプウェイトンネル
３２ 下り車線のランプウェイトンネル
４０ 分岐線トンネル用のシールドマシーン
５０ 本線トンネル用のシールドマシーン
２００ 交差予定箇所（折返し部分）
３００ 立坑および開削区間 I Road for automobile 1 Main line tunnel 3 Branch line tunnel 11 Up lane 12 Down lane 31 Up lane rampway tunnel 32 Down lane rampway tunnel 40 Shield machine for branch line tunnel 50 Shield machine 200 for main line tunnel (Folded part)
300 shaft and excavation section

Claims (6)

分岐線トンネルを有する本線トンネルを設けるにあたり、先に分岐線トンネルをシールド工法で形成後、分岐線トンネルと本線トンネルとの交差予定箇所を本線トンネル専用のシールドマシーンで貫通して本線トンネルを設けるトンネル形成方法。   A tunnel in which a main line tunnel having a branch line tunnel is formed by first forming the branch line tunnel by a shield method and then passing through the planned intersection of the branch line tunnel and the main line tunnel with a shield machine dedicated to the main line tunnel. Forming method. 前記本線トンネルは上り・下り線を含み、前記分岐線トンネルを、前記上り線に対して分岐させ、前記下り線に対して合流させることを特徴とする請求項１に記載のトンネル形成方法。   The tunnel forming method according to claim 1, wherein the main line tunnel includes an upstream line and a downstream line, and the branch line tunnel is branched with respect to the upstream line and merged with the downstream line. 前記分岐線トンネルを前記本線トンネルとの交差部分で折り返し形状に形成することを特徴とする請求項１または請求項２に記載のトンネル形成方法。   The tunnel forming method according to claim 1, wherein the branch line tunnel is formed in a folded shape at an intersection with the main tunnel. 前記本線トンネルは上り・下り線を含み、前記分岐線トンネルを、前記上り・下り線に対して共に分岐させることを特徴とする請求項１に記載のトンネル形成方法。   The tunnel forming method according to claim 1, wherein the main line tunnel includes an up / down line, and the branch line tunnel is branched with respect to the up / down line. 前記本線トンネルと前記分岐線トンネルとを斜めに交差させることを特徴とする請求項４に記載のトンネル形成方法。   The tunnel forming method according to claim 4, wherein the main line tunnel and the branch line tunnel are crossed obliquely. シールドマシーンによる切削が可能な材料で形成されたセグメントを用いて、前記分岐線トンネルのうち少なくとも前記交差部分を施工し、施工後当該交差部分をコンクリートで充填することを特徴とする請求項１〜請求項５のいずれかに記載のトンネル形成方法。   The segment formed of a material that can be cut by a shield machine is used to construct at least the intersection part of the branch line tunnel, and after the construction, the intersection part is filled with concrete. The tunnel formation method according to claim 5.
JP2004180750A 2004-06-18 2004-06-18 Tunnel formation method Expired - Lifetime JP4229880B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010190015A (en) * 2009-02-20 2010-09-02 Ohbayashi Corp Tunnel construction method and tunnel constructed by the tunnel construction method
JP2011208351A (en) * 2010-03-26 2011-10-20 Nippon Steel Materials Co Ltd Cuttable mortar segment and wall member of shield tunnel
CN113463646A (en) * 2021-05-31 2021-10-01 中铁隧道集团一处有限公司 Construction method under complex intersection condition of deep and large foundation pit and shallow tunnel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010190015A (en) * 2009-02-20 2010-09-02 Ohbayashi Corp Tunnel construction method and tunnel constructed by the tunnel construction method
JP4656243B2 (en) * 2009-02-20 2011-03-23 株式会社大林組 Tunnel construction method and tunnel constructed by the construction method
JP2011208351A (en) * 2010-03-26 2011-10-20 Nippon Steel Materials Co Ltd Cuttable mortar segment and wall member of shield tunnel
CN113463646A (en) * 2021-05-31 2021-10-01 中铁隧道集团一处有限公司 Construction method under complex intersection condition of deep and large foundation pit and shallow tunnel

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