JP4844929B2 - Tunnel construction method - Google Patents

Tunnel construction method Download PDF

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JP4844929B2
JP4844929B2 JP2007002213A JP2007002213A JP4844929B2 JP 4844929 B2 JP4844929 B2 JP 4844929B2 JP 2007002213 A JP2007002213 A JP 2007002213A JP 2007002213 A JP2007002213 A JP 2007002213A JP 4844929 B2 JP4844929 B2 JP 4844929B2
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tunnels
tunnel
constructed
floor slab
support structure
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JP2008169577A (en
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尚幸 荒木
孝一 前
英樹 野田
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Shimizu Corp
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Description

本発明は、複数のトンネルを上下方向および横方向に間隔をおいて並べて多段多連に構築することを基本とするトンネル工法に関する。 The present invention relates to a tunnel construction method based on constructing a plurality of tunnels by arranging them in the vertical direction and the horizontal direction at intervals in a multi-stage multiple structure.

大規模な道路トンネルにおいては、上り線および下り線を上下2段に設けるとともに、各線のそれぞれにおいて本線トンネルに対してランプトンネルを分岐合流させる場合があり、そのような大規模かつ複雑な形態のトンネルを構築するためには図11に示すような工法が最も一般的であると考えられる。
なお、以下の説明においては上段および下段に共通する構成要素には同一符号を付すが、特に区別する必要がある場合には上段に係わる構成要素についてはAの添字を付し、下段に係わる構成要素にはBの添字を付す。
In a large-scale road tunnel, the up and down lines are provided in two stages, and the ramp tunnel may be branched and joined to the main tunnel in each line. In order to construct a tunnel, it is considered that the construction method shown in FIG. 11 is the most common.
In the following description, components common to the upper and lower stages are denoted by the same reference numerals. However, if it is necessary to distinguish between them, the elements relating to the upper stage are denoted by the subscript A and the elements relating to the lower stage. The element has a B subscript.

すなわち、まず図11(a)に示すように本線トンネルとなる各段の2本のシールドトンネル1(1A,1B)と、ランプトンネルとなる各段の2本のシールドトンネル2(2A,2B)とを上下方向および横方向に間隔をおいて2段2連に設けた後、(b)に示すように各段のシールドトンネル1,2の間をそれぞれ拡幅してその上下に上部床版3(3A,3B)と下部床版4(4A,4B)とを施工することによって各段に分岐合流部となる拡幅部5(5A,5B)を設け、最終的にはそれぞれ断面形状が横長の2本の道路トンネルを2段にわたって構築するのである。
しかし、上記のような従来一般的な工法では各段の拡幅部5の施工に際して大がかりな支保工が不可欠であるし、上部床版3と下部床版4のいずれにも過大な断面力が作用するのでその所要強度および版厚は大きなものとならざるを得ない。
That is, first, as shown in FIG. 11 (a), two shield tunnels 1 (1A, 1B) at each stage to be main tunnels and two shield tunnels 2 (2A, 2B) at each stage to be ramp tunnels Are provided in two rows and two columns at intervals in the vertical direction and the horizontal direction, and then, as shown in FIG. (3A, 3B) and the lower floor slab 4 (4A, 4B) are provided to provide the widened portion 5 (5A, 5B) which becomes a branch and merge portion at each stage, and finally the cross-sectional shape is horizontally long. Two road tunnels are constructed over two levels.
However, in the conventional general construction method as described above, a large support work is indispensable for the construction of the widened portion 5 at each stage, and an excessive sectional force acts on both the upper floor slab 3 and the lower floor slab 4. Therefore, the required strength and plate thickness must be large.

そのため、このような形態のトンネルをより合理的に構築可能な工法としてたとえば特許文献1や特許文献2に示される工法も提案されている。
特許文献1に示される工法は、2本のシールドトンネルを横方向に2連に先行構築する際にその側面のセグメントを切削可能なものとしておいて、後段において矩形シールドによってそのセグメントを切削しながら2本のシールドトンネル間を掘削して拡幅部を施工するというものであり、この工法によって上下2段のトンネルを構築することにより図11(b)に示すものとほぼ同様の形態のトンネルを構築することができる。
特許文献2に示される工法は、2段2連の4本のシールドトンネルを構築することに代えて2本のシールドトンネルを上下方向に2段に設けるのみとして、その側方に地中壁を設け、各段のシールドトンネルと地中壁との間を拡幅することによってほぼ同様の形態のトンネルを構築するものである。この工法においては、特にシールドトンネルの覆工を鋼製セグメントによるものとして、拡幅部の上下に設ける鉄筋コンクリート造の床版をその鋼製セグメントに対して接合することにより、それらを構造的に確実に一体化させ得るとともに施工性を改善できるという利点もある。
特開2003−148086号公報 特開2006−97316号公報
Therefore, as a construction method capable of constructing such a tunnel more reasonably, for example, construction methods shown in Patent Document 1 and Patent Document 2 have been proposed.
The construction method shown in Patent Document 1 is such that when the two shield tunnels are constructed in advance in two lateral directions, the side segment can be cut, and the segment is cut by the rectangular shield in the subsequent stage. Excavation between two shield tunnels to construct a widened part. By constructing a two-stage tunnel by this construction method, a tunnel having the same form as shown in FIG. 11B is constructed. can do.
In the construction method shown in Patent Document 2, instead of constructing four shield tunnels in two stages and two series, only two shield tunnels are provided in two stages in the vertical direction, and an underground wall is provided on the side. By providing and widening the space between the shield tunnel and the underground wall of each step, a tunnel of almost the same form is constructed. In this construction method, the lining of the shield tunnel is made of steel segments, and the reinforced concrete floor slabs provided above and below the widened part are joined to the steel segments, so that they are structurally reliable. There is also an advantage that it can be integrated and workability can be improved.
JP 2003-148086 A JP 2006-97316 A

特許文献1や特許文献2に示される工法では、図11に示したようにシールドトンネル間を単に拡幅する場合に比較すれば施工の合理化を図ることができると考えられるが、前者は特殊な矩形シールドを使用する極めて特殊な工法であるし、後者は大規模な地中壁を構築するものであるから開削工法の場合と同様に地表部での用地確保とそこでの作業が必要であり、いずれも広く一般に採用できるものではない。   In the construction methods shown in Patent Document 1 and Patent Document 2, it is considered that the construction can be rationalized as compared with the case of simply widening between the shield tunnels as shown in FIG. 11, but the former is a special rectangular shape. It is a very special construction method using a shield, and since the latter is a construction of a large underground wall, as with the case of the excavation method, it is necessary to secure the site on the surface and work there. Is not widely accepted.

以上のように、上記で例示したような大規模で複雑な形態のトンネルを合理的に施工し得る工法は未だ確立されていないのが実情であり、本発明はそれを可能とする有効適切なトンネル工法を提供することを目的としている。 As described above, it is the actual situation that a construction method capable of rationally constructing a large-scale and complicated tunnel as exemplified above has not yet been established, and the present invention is effective and appropriate to enable it. The purpose is to provide a tunnel method .

請求項1記載の発明のトンネル工法は、複数のトンネルを上下方向および横方向に間隔をおいて並べて多段多連に構築し、それら多段多連のトンネルの間を掘削してそこに支保構造体を先行構築した後、各段のトンネルの間を掘削してそこに拡幅部をそれぞれ構築するとともに、各段の拡幅部を前記支保構造体を介して一体に連結することを特徴とする。 According to the tunnel construction method of the first aspect of the present invention, a plurality of tunnels are arranged in the vertical direction and the horizontal direction at intervals to construct a multi-stage multiple structure, and a support structure is excavated between the multi-stage multiple tunnels. Is constructed by excavating between the tunnels of the respective stages and constructing the widened parts therein, and the widened parts of the respective stages are integrally connected via the support structure.

請求項2記載の発明のトンネル工法は、請求項1記載の発明のトンネル工法において、分岐合流部トンネルとしての2本のトンネルを上下方向に間隔をおいて2段に構築するとともに、それらトンネルの側方に間隔をおいて本線トンネルとしての2本のトンネルをそれぞれ構築し、それら2段2連のトンネルの間を掘削して、上段の拡幅部の下部床版と下段の拡幅部の上部床版とそれらを一体に連結する補強壁版からなる支保構造体を先行構築した後、各段の2連のトンネルどうしの間を拡幅して上段の拡幅部の上部床版と下段の拡幅部の下部床版を施工して各段の拡幅部を構築することを特徴とする。 The tunnel construction method according to a second aspect of the invention is the tunnel construction method according to the first aspect , wherein two tunnels as branching junction tunnels are constructed in two stages at intervals in the vertical direction. Two tunnels are constructed as main tunnels at lateral intervals, and the lower floor slab of the upper widened part and the upper floor of the lower widened part are excavated between these two-stage double tunnels. After pre-constructing a support structure consisting of a plate and a reinforcing wall plate that connects them together, the space between the two tunnels at each stage is widened so that the upper floor slab of the upper widened part and the widened part of the lower stage It is characterized by constructing the widened part of each step by constructing the lower floor slab.

本発明のトンネル工法によれば、各段の拡幅部の施工に先立ってそれらの間に支保構造体を先行構築するので、その支保構造体によって各トンネルの全体を安定に支保でき、それ以降の施工を安全かつ精度良く行うことが可能である。また、支保構造体を先行構築することからその下段側に拡幅部を施工するに際しては大がかりな支保工を省略することが可能であり、したがって全体として施工効率を充分に向上させることができ、工費削減と工期短縮に寄与し得る。   According to the tunnel construction method of the present invention, since the support structure is pre-constructed between them prior to the construction of the widened portion of each step, the entire tunnel can be stably supported by the support structure, and thereafter Construction can be performed safely and accurately. In addition, since the support structure is constructed in advance, it is possible to omit a large support work when constructing the widened portion on the lower side thereof, and thus the construction efficiency can be sufficiently improved as a whole. It can contribute to reduction and shortening of construction period.

本発明のトンネル工法の一実施形態を図1〜図10を参照して説明する。
本実施形態では、基本的には図11に示した従来一般の工法と同様に、まず4本のシールドトンネル1,2(1A,2A,1B,2B)を2段2連に構築し、各段の2本のシールドトンネル1,2間を拡幅してそこに分岐合流部となる拡幅部5(5A,5B)を設けて最終的には横長断面の2本の道路トンネルを上下2段に設けるのであるが、本実施形態では各段に拡幅部5を施工するに先立って各シールドトンネル間に支保構造体10(図5参照)を先行構築することを主眼とする。
One embodiment of the tunneling method of the present invention will be described with reference to FIGS.
In the present embodiment, basically four shield tunnels 1 and 2 (1A, 2A, 1B, and 2B) are first constructed in two stages and in a similar manner to the conventional general construction method shown in FIG. Widening between the two shield tunnels 1 and 2 of the step and providing a widening portion 5 (5A, 5B) to become a branch and merge portion there, finally, the two road tunnels of the horizontally long cross section in two steps up and down However, in this embodiment, prior to the construction of the widened portion 5 in each step, the main purpose is to construct the support structure 10 (see FIG. 5) in advance between the shield tunnels.

すなわち、図1に示すように、まずランプトンネルのように本線トンネルに対して分岐合流する分岐合流部トンネルとなる2本のシールドトンネル2(2A,2B)を上下に間隔をおいて2段に設けるとともに、図2に示すようにその側方にそれぞれ間隔をおいて本線トンネルとなる2本のシールドトンネル1(1A,1B)を設けることにより、それら全4本のシールドトンネル2A,2B,1A,1Bを上下方向および横方向に間隔をおいて並べて2段2連に構築する。
なお、以下の説明では、適宜、分岐合流部トンネルとなるシールドトンネル2A,2Bを分岐合流部トンネル2A,2Bと言い換え、本線トンネルとなるシールドトンネル1A,1Bを本線トンネル1A,1Bと言い換える。
That is, as shown in FIG. 1, first, two shield tunnels 2 (2A, 2B) that become branch / junction tunnels that branch and merge with respect to the main tunnel like a ramp tunnel are arranged in two stages at intervals in the vertical direction. As shown in FIG. 2, by providing two shield tunnels 1 (1A, 1B) as main tunnels at intervals on the sides thereof, all four shield tunnels 2A, 2B, 1A are provided. , 1B are arranged in two rows and two columns by arranging them at intervals in the vertical direction and the horizontal direction.
In the following description, shield tunnels 2A and 2B serving as branch / merging portion tunnels are referred to as branch / merging portion tunnels 2A and 2B, and shield tunnels 1A and 1B serving as main tunnels are referred to as main tunnels 1A and 1B as appropriate.

図2に示すように拡幅部5の施工開始地点において、上段の分岐合流部トンネル2Aから(あるいは本線トンネル1A内からでも良い)、拡幅部5の上方に曲線パイプルーフ11を施工し、また、上下の分岐合流部トンネル2A,2B間に土留め壁12を施工し、図3に示すように上下の本線トンネル1A,1B間にも同様に土留め壁13を施工する。   As shown in FIG. 2, at the construction start point of the widened portion 5, the curved pipe roof 11 is constructed above the widened portion 5 from the upper junction branch 2 </ b> A (or from the main tunnel 1 </ b> A), The earth retaining wall 12 is constructed between the upper and lower branch junction tunnels 2A and 2B, and the earth retaining wall 13 is similarly constructed between the upper and lower main tunnels 1A and 1B as shown in FIG.

図4に示すように、上段の分岐合流部トンネル2A内から(あるいは本線トンネル1A内からでも良い)、両土留め壁12,13の間を掘削していき、図5に示すようにそこに鉄筋コンクリート造の支保構造体10を先行構築する。
支保構造体10は上壁部と下壁部と左右の側壁部とによる矩形断面とされて実質的にそれ自体がトンネルとして機能するものであるが、その上壁部は後段で施工する上段側の拡幅部5Aの下部床版4Aとなり、下壁部は同じく下段側の拡幅部5Bの上部床版3Bとなるものであり、左右の側壁部はそれら下部床版4Aと上部床版3Bとを構造的に連結してそれらを補強する2枚の補強壁版15として機能するものである。
As shown in FIG. 4, excavation is carried out between the two retaining walls 12 and 13 from the inside of the upper branch / junction tunnel 2A (or from the main tunnel 1A), as shown in FIG. A reinforced concrete support structure 10 is constructed in advance.
The support structure 10 has a rectangular cross section composed of an upper wall portion, a lower wall portion, and left and right side wall portions and substantially functions as a tunnel itself, but the upper wall portion is an upper stage side to be constructed in a later stage. The lower floor slab 4A of the widened portion 5A is formed, the lower wall portion is also the upper floor slab 3B of the widened portion 5B on the lower side, and the left and right side wall portions are connected to the lower floor slab 4A and the upper floor slab 3B. It functions as two reinforcing wall plates 15 that are structurally connected to reinforce them.

上記の支保構造体10を先行構築した後、図6に示すように上段の分岐合流部トンネル2A内から曲線パイプルーフ11の下方に対する掘削を開始して本線トンネル1A側に拡幅していく(あるいは本線トンネル1A内から分岐合流部トンネル2A側に拡幅していくことでも良い)。そして、図7に示すように施工するべき拡幅部5Aの施工区間全体にわたってその上部斜め前方に向けて適宜の先受け工16を施工しつつ、かつ分岐合流部トンネル2Aと本線トンネル1A内に適宜の支保工17を設置しながら、拡幅部5Aの上方を掘削して図8に示すようにそこに上部床版3Aを施工し、必要に応じて所望位置に側壁18(18A)を施工する。   After the above-mentioned support structure 10 is constructed in advance, as shown in FIG. 6, excavation of the lower part of the curved pipe roof 11 from the upper branch / junction tunnel 2A is started and widened to the main tunnel 1A side (or It may be widened from the main tunnel 1A toward the branch / merging section tunnel 2A). Then, as shown in FIG. 7, while appropriately constructing the receiving work 16 toward the upper oblique front over the entire construction section of the widening portion 5A to be constructed, and appropriately in the branch and junction tunnel 2A and the main tunnel 1A The upper floor slab 3A is excavated above the widened portion 5A and the upper floor slab 3A is constructed there as shown in FIG. 8, while the side wall 18 (18A) is constructed at a desired position.

また、同じく図8に示すように下段の分岐合流部トンネル2B内からその下方を掘削して本線トンネル1B側に拡幅していき(あるいは本線トンネル1B内から分岐合流部トンネル2B側に拡幅していくことでも良い)、図9に示すようにそこに下部床版4Bを施工して拡幅部5Bを施工し、所望位置に側壁18(18B)を施工する。   Similarly, as shown in FIG. 8, the lower part of the lower junction / junction tunnel 2B is excavated and widened to the main tunnel 1B side (or from the main tunnel 1B to the branch / merging section tunnel 2B side). As shown in FIG. 9, the lower floor slab 4B is constructed there to construct the widened portion 5B, and the side wall 18 (18B) is constructed at a desired position.

以上により上下の拡幅部5A,5Bの上部床版3A,3Bおよび下部床版4A,4Bの全てが施工されたので、図10に示すように各段の分岐合流部トンネル2と本線トンネル1の間のセグメントを解体撤去し、適宜の仕上げ工事や設備工事を行って拡幅部5A,5Bおよびトンネル全体を完成させる。   Since the upper floor slabs 3A and 3B and the lower floor slabs 4A and 4B of the upper and lower widened portions 5A and 5B have been constructed as described above, the branch / merging portion tunnel 2 and the main tunnel 1 of each stage as shown in FIG. The intermediate segment is disassembled and removed, and appropriate finishing work and facility work are performed to complete the widened portions 5A and 5B and the entire tunnel.

以上の工法によれば、上下の拡幅部5A,5Bの施工に先立ってそれらの間に支保構造体10を先行構築するので、その支保構造体10によって4本のシールドトンネル1A,1B,2A,2Bの全体を安定に支保でき、それ以降の施工を安全かつ精度良く行うことが可能となる。
また、支保構造体10はその上下に構築される拡幅部5A,5Bの下部床版4Aと上部床版3Bとを構造的に一体に連結して補強するものであるので、それら下部床版4Aと上部床版3Bに発生する断面力や、それらとトンネル覆工体との接合部における断面力を大幅に改善することができ、したがってそれらの版厚や所要鉄筋量を充分に削減することが可能であるし、ひいてはトンネル内の有効空間の拡大に寄与し得て道路標識の設置空間や換気ダクト類の設置スペース等を確保し易くなる利点も得られる。
しかも、支保構造体10は施工時はもとより完成後においてもそれ自体が実質的にトンネルとして機能するので、必要に応じてこの支保構造体10を換気ダクトやパイプスペース、あるいは保守通路や避難通路、共同溝といった様々な用途に有効活用することが可能である。
According to the above construction method, the support structure 10 is constructed in advance between the upper and lower widened portions 5A and 5B, so that the four shield tunnels 1A, 1B, 2A, The entire 2B can be stably supported, and the subsequent construction can be performed safely and accurately.
Further, since the support structure 10 reinforces the lower floor slab 4A and the upper floor slab 3B of the widened portions 5A and 5B constructed on the upper and lower sides thereof by structurally connecting them together, the lower floor slab 4A And the cross-sectional force generated in the upper floor slab 3B and the cross-sectional force at the joint between them and the tunnel lining body can be greatly improved, and therefore the plate thickness and the amount of required reinforcing bars can be sufficiently reduced. In addition, it is possible to contribute to the expansion of the effective space in the tunnel, and the advantage that it is easy to secure a space for installing road signs, a space for installing ventilation ducts, and the like.
Moreover, since the support structure 10 itself substantially functions as a tunnel at the time of construction as well as after completion, the support structure 10 can be used as a ventilation duct, a pipe space, a maintenance passage, an escape passage, It can be effectively used for various purposes such as common grooves.

また、従来のように各段の施工をそれぞれ独立に行うのではなく上記のように各段の施工を有機的に関連づけて施工することにより施工全体の合理化を図ることができるし、特に下段側の拡幅部5Bの施工に際してはその上部に支保構造体10が既に構築されているのでそれ以外には大がかりな支保工を省略することが可能であり、したがって全体として施工効率を充分に向上させることができる。
勿論、支保構造体10の先行構築はいずれかのシールドトンネル内からの作業により適宜の在来工法によって支障なく容易に行い得るし、特許文献1に示される工法のように特殊なシールド機を用いたり、特許文献2に示される工法のように地表部からの工事を必要とするものでもないから、従来工法に比べて充分に工費削減と工期短縮を図ることができる。
In addition, it is possible to rationalize the entire construction by constructing each stage in an organic manner as described above, rather than performing each stage independently as in the past. When constructing the widened portion 5B, the support structure 10 has already been built in the upper part, so that it is possible to omit other large support work, and therefore the construction efficiency can be sufficiently improved as a whole. Can do.
Of course, the prior construction of the support structure 10 can be easily performed without any trouble by an appropriate conventional construction method by working from within any shield tunnel, and a special shield machine is used as in the construction method disclosed in Patent Document 1. However, unlike the construction method shown in Patent Document 2, it does not require construction from the surface, so that the construction cost and construction period can be sufficiently reduced as compared with the conventional construction method.

なお、上部床版3と下部床版4およびその一部として機能する支保構造体10の構造としては、基本的には鉄筋コンクリート造とすれば良いが、たとえば鋼板を型枠および構造材として使用してその内部にコンクリートを充填する構造の鋼殻コンクリート造とすることも考えられる。
また、それらを鉄筋コンクリート造とする場合においては、特許文献2に示されているように、各シールドトンネル1,2のセグメントとして鋼製セグメントを使用して、その鋼製セグメントに対して上部床版3や下部床版4のみならず支保構造体10を構成する鉄筋をワンタッチ継手により機械的に接合することが好ましい。そのようにすれば、上部床版3や下部床版4および支保構造体10全体の施工を効率的に実施できるし、それらとセグメントとの構造的な一体化を確実かつ充分に図ることができ、したがって上部床版3や下部床版4およびその機能を兼ねる支保保構造体10の断面力をさらに改善することが可能となる。
The upper floor slab 3 and the lower floor slab 4 and the structure of the support structure 10 functioning as a part thereof may basically be reinforced concrete. For example, steel plates are used as molds and structural materials. It is also conceivable to use a steel shell concrete structure in which the inside is filled with concrete.
Moreover, when making them a reinforced concrete structure, as shown in patent document 2, a steel segment is used as a segment of each shield tunnel 1 and 2, and an upper floor slab is used with respect to the steel segment. 3 and the lower floor slab 4 as well as the reinforcing bars constituting the support structure 10 are preferably mechanically joined by a one-touch joint. By doing so, the upper floor slab 3, the lower floor slab 4 and the support structure 10 as a whole can be efficiently constructed, and the structural integration between them and the segments can be achieved reliably and sufficiently. Therefore, it is possible to further improve the cross-sectional force of the upper floor slab 3 and the lower floor slab 4 and the support structure 10 also serving as the function thereof.

以上で本発明の一実施形態を説明したが、上記実施形態はあくまで好適な一例に過ぎず、本発明は上記実施形態に限定されることなく様々な応用や設計的変更が可能である。
たとえば上記実施形態は2段2連の4本のシールドトンネルによる上下2段の道路トンネルに対し分岐合流部となる拡幅部を構築する場合の適用例であるが、本発明はさらに多数のトンネルを多連多段に設ける場合にも同様に適用できるものであって、いずれにしても各トンネル間に支保構造体を先行構築してその支保構造体を介して各段の拡幅部どうしを構造的に一体化することにより同様の効果が得られる。
また、支保構造体はその周囲の各トンネルを支保するものであれば良く、その限りにおいて支保構造体の設置形態や断面形状は任意であって、必ずしも上記実施形態のようにそれ自体がトンネルとして機能するものとする必要はない。
勿論、各トンネルの構造や断面形状、寸法は任意であって、必ずしもシールド工法によるシールドトンネルに限るものではなく他の工法によるトンネルであっても良いし、それらのトンネルは全体として上下方向および横方向に配置されていれば良いのであって必ずしも水平方向や鉛直方向に並べる必要はなく、水平や鉛直に対して斜め方向に並べることでも良い。
また、本発明は道路トンネルに限らず鉄道トンネルをはじめとする各種用途のトンネルや、さらには同様の形態のトンネル状の地下構造物の施工に際しても適用できることは当然であり、したがって拡幅部の構造や形状もその用途や目的に応じて適宜変更すれば良い。
いずれにしても、各トンネル間にそれらを構造的に連結して支保するための支保構造体を先行構築してから各段を拡幅して拡幅部を施工するという本発明工法の要旨を逸脱しない範囲内であれば、トンネル全体の形態や断面形状、具体的な施工手順や補助工法その他細部の具体的な要件については,各トンネルの構造や大きさ、トンネル全体の形態や規模、用途等を考慮して最適設計すれば良い。
Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment, and various applications and design changes are possible.
For example, the above embodiment is an application example in the case of constructing a widened portion that becomes a branching / merging portion with respect to a two-stage upper and lower road tunnel made up of four shield tunnels in two stages, but the present invention further increases the number of tunnels. It can also be applied in the same way when it is provided in multiple and multi-stages. In any case, a support structure is constructed in advance between the tunnels, and the widened portions of each stage are structurally arranged through the support structure. The same effect can be obtained by integrating them.
In addition, the support structure may be any structure as long as it supports each of the surrounding tunnels. As long as the support structure is installed, the installation form and the cross-sectional shape of the support structure are arbitrary. It doesn't have to be functional.
Of course, the structure, cross-sectional shape, and dimensions of each tunnel are arbitrary, and are not necessarily limited to shield tunnels by the shield method, and may be tunnels by other methods. As long as they are arranged in the direction, they do not necessarily have to be arranged in the horizontal direction or the vertical direction, and may be arranged in an oblique direction with respect to the horizontal or vertical direction.
In addition, the present invention is not limited to road tunnels and can be applied to tunnels for various uses including railroad tunnels, and tunnel-like underground structures having similar forms. The shape and shape may be appropriately changed according to the use and purpose.
In any case, it does not deviate from the gist of the present invention method of constructing a widened portion by widening each step after constructing a support structure for structurally connecting and supporting each tunnel between them. If it is within the scope, the structure and size of each tunnel, the form and scale of the tunnel, the application, etc., regarding the form and cross-sectional shape of the entire tunnel, specific construction procedures and auxiliary construction methods, and other specific details The optimum design should be taken into consideration.

本発明の実施形態であるトンネル工法の施工手順を示す図であって、2本の分岐合流部トンネルを施工した状態を示す図である。It is a figure which shows the construction procedure of the tunnel construction method which is embodiment of this invention, Comprising: It is a figure which shows the state which constructed two branch merge tunnels. 同、2本の本線トンネルと曲線パイプルーフとを施工した状態を示す図である。It is a figure which shows the state which constructed two main line tunnels and the curved pipe roof. 同、支保構造体の施工のための土留め壁を施工した状態を示す図である。It is a figure which shows the state which constructed the earth retaining wall for construction of a support structure same as the above. 同、支保構造体の施工のための掘削工事を実施している状態を示す図である。It is a figure which shows the state which is implementing the excavation construction for construction of a support structure same as the above. 同、支保構造体を構築した状態を示す図である。It is a figure which shows the state which constructed | assembled the support structure same as the above. 同、上段の拡幅部の上部を拡幅する状態を示す図である。It is a figure which shows the state which widens the upper part of the wide part of an upper stage similarly. 同、上段の拡幅部の上部を拡幅している状態を示す図である。It is a figure which shows the state which is widening the upper part of the wide part of an upper stage similarly. 同、上段の拡幅部の上部床版を施工し、下段の拡幅部の下部を拡幅している状態を示す図である。It is a figure which shows the state which constructs the upper floor slab of the wide part of an upper stage, and widens the lower part of the wide part of a lower stage. 同、下段の拡幅部の下部床版を施工した状態を示す図である。It is a figure which shows the state which constructed the lower floor slab of the wide part of the lower stage similarly. 同、各段の拡幅部を拡幅した完成状態を示す図である。It is a figure which shows the completion state which widened the wide part of each step | paragraph similarly. 従来一般の拡幅部の施工手法を示す概要図である。It is a schematic diagram which shows the construction method of the conventional general widening part.

符号の説明Explanation of symbols

1(1A,1B) シールドトンネル(トンネル、本線トンネル)
2(2A,2B) シールドトンネル(トンネル、分岐合流部トンネル)
3(3A,3B) 上部床版
4(4A,4B) 下部床版
5(5A,5B) 拡幅部(分岐合流部)
10 支保構造体
11 曲線パイプルーフ
12,13 土留め壁
15 補強壁版
16 先受け工
17 支保工
18側壁
1 (1A, 1B) Shield tunnel (tunnel, main line tunnel)
2 (2A, 2B) Shield tunnel (tunnel, branch junction tunnel)
3 (3A, 3B) Upper floor slab 4 (4A, 4B) Lower floor slab 5 (5A, 5B) Widening part (branch / merging part)
DESCRIPTION OF SYMBOLS 10 Support structure 11 Curved pipe roof 12, 13 Earth retaining wall 15 Reinforcement wall plate 16 Preceding work 17 Supporting work 18 Side wall

Claims (2)

複数のトンネルを上下方向および横方向に間隔をおいて並べて多段多連に構築し、
それら多段多連のトンネルの間を掘削してそこに支保構造体を先行構築した後、
各段のトンネルの間を掘削してそこに拡幅部をそれぞれ構築するとともに、各段の拡幅部を前記支保構造体を介して一体に連結することを特徴とするトンネル工法。
Build multiple tunnels by arranging multiple tunnels at intervals in the vertical and horizontal directions,
After excavating between these multi-stage multiple tunnels and building a support structure there,
A tunnel construction method characterized by excavating between the tunnels of each step and constructing the widened portion there, and connecting the widened portion of each step integrally through the support structure.
請求項1記載のトンネル工法であって、
分岐合流部トンネルとしての2本のトンネルを上下方向に間隔をおいて2段に構築するとともに、それらトンネルの側方に間隔をおいて本線トンネルとしての2本のトンネルをそれぞれ構築し、
それら2段2連のトンネルの間を掘削して、上段の拡幅部の下部床版と下段の拡幅部の上部床版とそれらを一体に連結する補強壁版からなる支保構造体を先行構築した後、
各段の2連のトンネルどうしの間を拡幅して上段の拡幅部の上部床版と下段の拡幅部の下部床版を施工して各段の拡幅部を構築することを特徴とするトンネル工法。
The tunnel construction method according to claim 1 ,
Two tunnels as branch and junction tunnels are constructed in two stages at intervals in the vertical direction, and two tunnels are constructed as main tunnels at intervals on the sides of the tunnels,
Drilling between these two-stage double tunnels, a support structure consisting of a lower floor slab in the upper widened part, an upper floor slab in the lower widened part, and a reinforcing wall slab that integrally connects them was constructed in advance. rear,
A tunnel construction method that widens the space between two tunnels at each stage and constructs the widened part at each stage by constructing the upper floor slab at the upper widened part and the lower floor slab at the lower widened part. .
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CN102322266A (en) * 2011-06-17 2012-01-18 中铁十一局集团第五工程有限公司 Tunnel excavating and constructing method
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