JP4587919B2 - How to construct a junction and junction of shield tunnel - Google Patents

How to construct a junction and junction of shield tunnel Download PDF

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JP4587919B2
JP4587919B2 JP2005265264A JP2005265264A JP4587919B2 JP 4587919 B2 JP4587919 B2 JP 4587919B2 JP 2005265264 A JP2005265264 A JP 2005265264A JP 2005265264 A JP2005265264 A JP 2005265264A JP 4587919 B2 JP4587919 B2 JP 4587919B2
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tunnel
shield
merging
branch
shield tunnel
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雅也 福居
泰治 花岡
貴 狩野
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Hitachi Zosen Corp
Okumura Corp
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Description

本発明は、本線シールドトンネルに分岐合流シールドトンネルを接合してトンネルの分岐合流部を形成するシールドトンネルの分岐合流部施工方法に関する。   The present invention relates to a method for constructing a branching / merging portion of a shield tunnel in which a branching / merging shield tunnel is joined to a main shield tunnel to form a branching / merging portion of the tunnel.

例えば、地中に先行形成された本線トンネルにランプトンネル等の分岐合流トンネルを接続する工法として、分岐合流部分の地盤を開削して立坑を設け、この立坑の内部において本線トンネルと分岐合流トンネルとを接合する工法が考えられる。また、このような開削工法は、特に都市部においては、地上での施工スペースや用地の確保等に問題がある上、周囲への環境問題も生じやすくなることから、地中において分岐合流トンネルと本線トンネルとを接合する工法として、例えば本線トンネルと分岐合流トンネルとを間隔をおいて別々に施工し、この間隔部分の上下を覆って山留部材を圧入したり、地盤改良を行ってから、当該間隔部分を掘削して両者を繋ぐ工法（例えば、特許文献１参照）や、本線トンネルの分岐部または合流部に大断面のトンネルを形成し、この大断面のトンネル内部から分岐（合流）方向に小断面のシールドトンネルを分岐合流トンネルとして掘進していく工法（例えば、特許文献２参照）等、種々の工法が提案されている。   For example, as a method of connecting a branch and confluence tunnel such as a ramp tunnel to a main tunnel formed in the ground, a ground shaft is formed by excavating the ground of the branch and confluence portion, and a main tunnel and a branch and confluence tunnel are formed inside the shaft. A method of joining the two is considered. In addition, such an open-cut method has a problem in securing construction space and site on the ground, especially in urban areas, and environmental problems to the surroundings are likely to occur. As a method of joining the main tunnel, for example, the main tunnel and the branch and confluence tunnel are separately constructed with an interval, covering the top and bottom of this interval portion and press-fitting a retaining member, or after improving the ground, A method of excavating the gap portion to connect the two (for example, see Patent Document 1), or forming a large-section tunnel at the branching or merging portion of the main tunnel, and branching (merging) direction from inside the large-section tunnel Various methods have been proposed, such as a method of excavating a shield tunnel having a small cross section as a branching and converging tunnel (see, for example, Patent Document 2).

また、これらの分岐合流トンネルと本線トンネルとを地中で接合する従来の工法では、地中の深部において大掛かりな地盤改良や山留支保工を施す必要があるため、施工コストが増大し、工期も長くなる。これに対して、施工コストの低減や、工期の短縮を図ることを目的として、シールド掘進機によって地中に先行形成された本線トンネルの接合側面部分を分岐合流トンネル用のシールド掘進機によって切削可能に構成し、この切削可能な部分を直接切削させつつ分岐合流トンネル用のシールド掘進機を掘進させ、本線トンネルに到達させることにより、本線トンネルと分岐合流トンネルとを地中で連通させる工法も提案されている（例えば、特許文献３参照）。
特許第２８３９４４０号公報 特開２００１−３５５３８５号公報 特開２００４−２１１３６１号公報 In addition, in the conventional method of joining these branch and junction tunnels and main line tunnels in the ground, it is necessary to perform large ground improvement and mountain retaining works deep in the ground, which increases the construction cost and the construction period. Also gets longer. On the other hand, for the purpose of reducing construction costs and shortening the construction period, it is possible to cut the joint side surface part of the main tunnel formed in the ground by the shield tunneling machine with the shield tunneling machine for the branch and merge tunnel Proposing a construction method that allows the main tunnel and the branch / merging tunnel to communicate with each other by excavating the shield tunneling machine for the branch / merging tunnel while directly cutting the cuttable portion and reaching the main tunnel. (For example, see Patent Document 3).
Japanese Patent No. 2839440 JP 2001-355385 A JP 2004-21361 A

本線トンネルの接合側面部分を分岐合流トンネル用のシールド掘進機によって直接切削させて本線シールドトンネルに分岐合流シールドトンネルを接合する場合、本線トンネルは、接合側面部分が切削されて断面欠損を生じることになり、本体覆工が施されるまでの間、分岐合流部分の構造が周囲の地盤からの土圧や水圧に対して不安定な状態となりやすい。したがって、円形断面を備える分岐合流トンネル用のシールド掘進機の全体を、円形断面を備える本線トンネルの接合側面部分に貫通させて本線トンネルの内部に到達させる方法は、本線トンネルの断面欠損が大きくなりすぎて施工が困難である。また、本線トンネルの径を大きくして断面が欠損する部分の割合を小さくすることも考えられるが、本線トンネルが不必要に大きくなりすぎて不経済であるため現実的ではない。   When the junction side part of the main tunnel is directly cut by the shield tunneling machine for the branch junction tunnel and the junction tunnel shield is joined to the main shield tunnel, the junction side part of the main tunnel is cut and a cross-sectional defect is generated. Therefore, the structure of the branching / merging portion is likely to be unstable with respect to the earth pressure and water pressure from the surrounding ground until the body lining is applied. Therefore, the method of passing the entire shield tunneling machine for a branch / junction tunnel with a circular cross section through the joint side surface of the main tunnel with a circular cross section to reach the inside of the main tunnel increases the cross section of the main tunnel. It is too difficult to install. Although it is conceivable to increase the diameter of the main tunnel and reduce the proportion of the section missing, this is not practical because the main tunnel becomes unnecessarily large and uneconomical.

このようなことから、特許文献３に記載のシールドトンネルの分岐合流部施工方法では、本線トンネルを形成するための本線シールド掘進機として、図８（ａ）〜（ｃ）に示すように、円形の本体部分５０から幅方向外側に張り出す拡幅部５１を、必要に応じて片側又は両側に形成することが可能なシールド掘進機を使用し、図９に示すように、通常の円形断面の掘進工区５２ａから、分岐合流トンネル５３との接合部分とは反対側に拡幅部５１を突出させて形成する工区５２ｂに移り、突出させた拡幅部５１の側縁が後方の円形断面の本線トンネル５４の側縁の延長線上に来るように、本体部分５０の中心線５０ｃを側方に移動させる工区５２ｃを経て、分岐合流トンネル５３との接合部分の側にも拡幅部５１を突出させて形成する工区５２ｄに移り、しかる後に、この接合部分の側の小径の拡幅部５１において、ランブシールド掘進機５５を本線トンネル５４に到達させて分岐合流トンネル５３を接合する方法が採用されている。   For this reason, in the method for constructing a junction / junction part of a shield tunnel described in Patent Document 3, as a main shield shield machine for forming a main tunnel, as shown in FIGS. 9 using a shield machine capable of forming the widened portion 51 projecting outward in the width direction from the main body portion 50 of the main body portion 50 on one side or both sides as required. The work section 52a is moved to a work section 52b formed by projecting the widened portion 51 on the side opposite to the joint portion with the branch and merge tunnel 53, and the side edge of the projecting widened portion 51 is the rear circular cross section of the main tunnel 54. A work zone formed by projecting the widened portion 51 to the side of the joint portion with the branch and merge tunnel 53 through the work zone 52c for moving the center line 50c of the main body portion 50 to the side so as to be on the extension line of the side edge. 5 It moved to d, and thereafter, the widening section 51 of the small-diameter side of the joint portion, a method of joining the branching and joining tunnel 53 to reach the Ranbu shield machine 55 to the main line tunnel 54 is employed.

また、特許文献３に記載のシールドトンネルの分岐合流部施工方法では、例えば分岐合流トンネル５３内の道路車線を、本線トンネル内の道路車線に擦り付けるのに必要な距離を確保する工区５２ｄにおいて、両側に拡幅部５１を突出させた状態の本線シールド掘進機で本線トンネル５４を形成したら、本体部分５０の中心線を元の円形断面の中心線の位置に復帰させるように本線シールド掘進機を側方に移動させる工区５２ｅを経て、両側の拡幅部５１を後退させた後に、本線シールド掘進機による通常の円形断面の掘進工区５２ｇに復帰することになる。   Further, in the method for constructing a branching / merging portion of a shield tunnel described in Patent Document 3, for example, in a work section 52d that secures a distance necessary for rubbing a road lane in the branch / merging tunnel 53 to a road lane in the main tunnel, both sides When the main line tunnel 54 is formed by the main line shield machine with the widened portion 51 protruding to the side, the main line shield machine is moved to the side so that the center line of the main body portion 50 is returned to the position of the center line of the original circular section. After retreating the widened portions 51 on both sides through the work section 52e to be moved to the normal area, the main shield shield machine returns to the ordinary work section 52g having a circular cross section.

しかしながら、このようなシールドトンネルの分岐合流部施工方法では、本線シールド掘進機の拡幅部５１を外側に進退させたり、本線シールド掘進機を側方に移動させながら掘進作業を行う必要があるため、施工工程が煩雑になって管理が難しくなると共に、施工精度も低下しやすい。また、例えば道路車線等を確保するための空間以外の、余分な断面部分の掘進作業や覆工作業も多くなって、効率の良い施工を行うことが困難である。   However, in such a method for constructing the junction and junction of the shield tunnel, it is necessary to perform the excavation work while moving the widening portion 51 of the main shield engraver outward and / or moving the main shield excavator to the side. The construction process becomes complicated and difficult to manage, and the construction accuracy tends to decrease. In addition, for example, excavation work and lining work for extra cross sections other than the space for securing road lanes and the like increase, making it difficult to perform efficient construction.

本発明は、簡易な施工工程に従って、分岐合流トンネル用のシールド掘進機で本線トンネルの接合側面部分を直接切削しつつ、本線トンネルに分岐合流トンネルを接合させて分岐合流部を形成することができると共に、余分な断面部分の掘進作業や覆工作業を抑制して、効率の良い施工を行うことのできるシールドトンネルの分岐合流部施工方法を提供することを目的とする。   According to the present invention, according to a simple construction process, it is possible to form a branching / merging part by joining a branching / merging tunnel to the main tunnel while directly cutting the joint side surface portion of the main tunnel with a shield tunneling machine for the branch / merging tunnel. In addition, an object is to provide a method for constructing a branching and merging portion of a shield tunnel capable of performing an efficient construction while suppressing an excavation work and a lining work of an excessive cross section.

本発明は、本線シールドトンネルに分岐合流シールドトンネルを接合してトンネルの分岐合流部を形成するシールドトンネルの分岐合流部施工方法であって、前記分岐合流シールドトンネルを形成する分岐合流シールド掘進機として、長軸の長さを調整可能にして略長円断面形状のシールドトンネルを形成する機構を備えるシールド掘進機を使用し、前記長軸の長さを最短にした状態で前記分岐合流シールド掘進機を掘進させて前記分岐合流部に接近させる工程と、前記長軸の長さを伸ばした状態とし、シールド掘進機により切削可能な切削セグメントを用いて接合側面部分を形成した前記分岐合流部における前記本線シールドトンネルのトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の中壁設置区間を形成する工程と、前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態を保持したまま、前記長軸の長さを前記本線シールドトンネル側に収縮しつつ、前記接合側面部分のトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の車線確保区間を形成する工程と、前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態を保持したまま、前記長軸の長さを最短にして、前記接合側面部分のトンネル外郭体をさらに切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の車線擦り付け区間を形成する工程とを含むシールドトンネルの分岐合流部施工方法を提供することにより、上記目的を達成したものである。   The present invention is a method for constructing a branching / merging part of a shield tunnel in which a branching / merging shield tunnel is joined to a main shield tunnel to form a branching / merging part of the tunnel, and as a branch / merging shield tunneling machine for forming the branching / merging shield tunnel , Using a shield machine equipped with a mechanism for forming a shield tunnel having a substantially oval cross-sectional shape by adjusting the length of the major axis, and the branch and merge shield machine with the length of the major axis being minimized In the branching and joining part in which the joining side part is formed using a cutting segment that can be cut by a shield machine. Install the inner wall of the branch / merging section by excavating the branch / merging shield machine while cutting the outer shell of the main shield tunnel And the length of the major axis is set to the main shield tunnel side while maintaining the overlapping state of the main shield tunnel and the branch / merged shield tunnel in the cross section at the start and end of the middle wall installation section. A step of forming the lane securing section of the branch and merge part by excavating the branch and merge shield machine while cutting the tunnel outer body of the joint side surface, and the start and end points of the middle wall installation section While maintaining the overlapping state of the main shield tunnel and the branch / merged shield tunnel in a cross section at the same time, the length of the long axis is made the shortest and the tunnel outer body of the joint side surface portion is further cut while the branch / merged portion is further cut A method for constructing a branching / merging part of a shield tunnel including a step of forming a lane rubbing section of the branching / merging part by excavating a shield machine By providing, in which to achieve the above objects.

また、本発明のシールドトンネルの分岐合流部施工方法によれば、前記分岐合流部の中壁設置区間を形成する工程では、前記長軸の長さを最短にした分岐合流シールド掘進機を前記分岐合流部に近接又は接触させた後に、前記長軸の長さを前記本線シールドトンネル側に伸張して伸ばした状態としつつ、前記接合側面部分のトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させることもできる。   Further, according to the method for constructing a branching / merging portion of the shield tunnel according to the present invention, in the step of forming the middle wall installation section of the branching / merging portion, the branching / merging shield machine with the shortest length of the long axis is used as the branch The branching and merging shield machine while cutting the tunnel outer body of the joint side surface part while making the length of the long axis extend and extend toward the main shield tunnel side after being brought close to or in contact with the merging part You can also dig up.

さらに、本発明のシールドトンネルの分岐合流部施工方法によれば、前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態は、前記分岐合流シールドトンネルの略長円断面形状の上下の直線部分から本線シールドトンネル側の曲線部分へのコーナー部分が、各々円形断面の本線シールドトンネルの円周部分に位置するような位置関係で重なった状態となっていることが好ましい。   Further, according to the method for constructing a branching / merging portion of the shield tunnel according to the present invention, the overlapping state of the main shield tunnel and the branching / merging shield tunnel in the cross section at the start / end point of the middle wall installation section is the branch / merging shield tunnel. The corners from the upper and lower straight portions of the substantially oval cross-sectional shape to the curved portion on the main shield tunnel side overlap with each other so as to be positioned at the circumferential portion of the main shield tunnel with a circular cross section. Preferably it is.

本発明のシールドトンネルの分岐合流部施工方法によれば、簡易な施工工程に従って、分岐合流トンネル用のシールド掘進機で本線トンネルの接合側面部分を直接切削しつつ、本線トンネルに分岐合流トンネルを接合させて分岐合流部を形成することができると共に、余分な断面部分の掘進作業や覆工作業を抑制して、効率の良い施工を行うことができる。   According to the method for constructing a junction / junction part of a shield tunnel according to the present invention, the junction / junction tunnel is joined to the main tunnel while directly cutting the joining side surface portion of the main tunnel using a shield excavator for the junction / junction tunnel according to a simple construction process. As a result, branching and joining portions can be formed, and excavation work and lining work for extra cross sections can be suppressed, and efficient construction can be performed.

本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法は、例えば高速道路のジャンクション部において、図１に示すように、本線シールドトンネル１１と分岐合流シールドトンネル１２との分岐合流部１０を地中に形成するべく、シールド工法による本線トンネル１１に、シールド工法による分岐合流トンネル１２を地中で直接接合する際に採用されたものである。本実施形態によれば、本線シールドトンネル１１の標準断面は、例えば車線幅員が３．２５ｍｍの３車線の道路を設けることのできる大きさの円形断面となっており（図２参照）、分岐合流シールドトンネル１２の標準断面は、例えば車線幅員が３．５ｍｍの２車線の道路を設けることのできる大きさの略長円形断面となっている（図２参照）。   As shown in FIG. 1, for example, in a junction part of a highway, a method for constructing a branch / merge part of a shield tunnel according to a preferred embodiment of the present invention is a branch / merge part 10 of a main line shield tunnel 11 and a branch / merge shield tunnel 12. In order to form the ground in the ground, it is employed when the branch and merge tunnel 12 by the shield method is directly joined to the main tunnel 11 by the shield method. According to the present embodiment, the standard cross section of the main shield tunnel 11 is a circular cross section having a size capable of providing a three-lane road with a lane width of 3.25 mm, for example (see FIG. 2). The standard cross section of the shield tunnel 12 is, for example, a substantially oval cross section having a size capable of providing a two-lane road with a lane width of 3.5 mm (see FIG. 2).

また、本実施形態の分岐合流部施工方法は、本線シールドトンネル１１に対して、分岐合流シールド掘進機１３を、分岐合流シールドトンネル１２内の道路線形に応じた緩い角度で斜めに擦り付けるように接近させ、当該分岐合流シールド掘進機１３のカッター板１３ａによって、本線シールドトンネル１１のトンネル外郭体１５を構成する、接合側面部分１１ａに配置されたシールド掘進機によって切削可能な切削セグメント１５ａ（図２参照）を切削させつつ、分岐合流シールドトンネル１２の接合側部１２ａを本線シールドトンネル１１の接合側面部分１１ａに食い込ませる工法を採用して（図２参照）、本線シールドトンネル１１を分岐合流シールドトンネル１２に連通させるものである。   Further, the branching / merging portion construction method of the present embodiment approaches the main shield tunnel 11 so that the branching / merging shield machine 13 is obliquely rubbed at a gentle angle corresponding to the road alignment in the branch / merging shield tunnel 12. The cutting segment 15a (see FIG. 2) that can be cut by the shield machine disposed on the joint side surface portion 11a that constitutes the tunnel outer body 15 of the main shield tunnel 11 by the cutter plate 13a of the branch and merge shield machine 13 ) Is employed, and a method of biting the joint side portion 12a of the branch / merged shield tunnel 12 into the joint side surface portion 11a of the main shield tunnel 11 (see FIG. 2) is adopted. To communicate with.

ここで、本実施形態によれば、本線シールドトンネル１１と分岐合流シールドトンネル１２との分岐合流部１０は、本線シールドトンネル１１のトンネル外郭体１５が分岐合流シールド掘進機１３によって切削されて、本線シールドトンネル１１の接合側面部分１１ａと分岐合流シールドトンネル１２の接合側部１２ａとが交差又は重複して配置される部分である。また、本実施形態によれば、分岐合流シールド掘進機１３は、分岐合流シールドトンネル１２内の道路線形を本線シールドトンネル１１内の道路線形に合流させるのに必要な距離を確保できるように、予め設定された所定の延長で分岐合流部１０の掘進作業を行った後に、例えばその掘進作業の終端位置に埋殺しされたり、或いはスキンプレートを残して内部の機械や設備が撤去されて、分岐合流シールドトンネル１２のトンネル外郭体１６の一部として利用されることになる。   Here, according to the present embodiment, the branch / merging portion 10 between the main shield tunnel 11 and the branch / merging shield tunnel 12 is obtained by cutting the tunnel outer body 15 of the main shield tunnel 11 by the branch / merging shield tunneling machine 13. The junction side surface portion 11a of the shield tunnel 11 and the junction side portion 12a of the branching / merging shield tunnel 12 are portions that intersect or overlap each other. In addition, according to the present embodiment, the branching / merging shield machine 13 is provided in advance so as to ensure a distance necessary to join the road alignment in the branching / merging shield tunnel 12 to the road alignment in the main shield tunnel 11. After excavation work of the branching / merging section 10 with a predetermined extension set, for example, it is buried at the end position of the excavation work, or the internal machine or equipment is removed leaving the skin plate, and the branching / merging is performed It will be used as a part of the tunnel outer body 16 of the shield tunnel 12.

そして、本実施形態のシールドトンネルの分岐合流部施工方法は、本線シールドトンネル１１に分岐合流シールドトンネル１２を接合してトンネルの分岐合流部１０を形成するための施工方法であって、分岐合流シールドトンネル１２を形成する分岐合流シールド掘進機１３として、長軸１３ａの長さを調整可能にして略長円断面形状のシールドトンネルを形成する機構を備えるシールド掘進機を用いて施工され、図２〜図６に示すように、以下の工程ａ）〜ｄ）を含んでいる。   The method for constructing the branching / merging portion of the shield tunnel according to the present embodiment is a construction method for joining the branching / merging shield tunnel 12 to the main shield tunnel 11 to form the branch / merging portion 10 of the tunnel. As the branching and merging shield machine 13 for forming the tunnel 12, it is constructed by using a shield machine having a mechanism for forming a shield tunnel having a substantially oval cross-sectional shape by adjusting the length of the long axis 13a. As shown in FIG. 6, the following steps a) to d) are included.

ａ） 長軸１３ａの長さを最短にした状態で分岐合流シールド掘進機１３を掘進させて分岐合流部１０に接近させる工程（図２参照）。
ｂ） 長軸１３ａの長さを伸ばした状態とし、シールド掘進機により切削可能な切削セグメント１５ａを用いて接合側面部分１１ａを形成した分岐合流部１０における本線シールドトンネル１１のトンネル外郭体１５を切削しながら分岐合流シールド掘進機１３を掘進させて、分岐合流部１０の中壁設置区間１０ａを形成する工程（図３，図４参照）。
ｃ） 中壁設置区間１０ａの始終点１４（図１参照）での断面における本線シールドトンネル１１と分岐合流シールドトンネル１２との重なり状態（図４参照）を保持したまま、長軸１３ａの長さを本線シールドトンネル１１側に収縮しつつ、接合側面部分１１ａのトンネル外郭体１５ａを切削しながら分岐合流シールド掘進機１３を掘進させて、分岐合流部１０の車線確保区間１０ｂを形成する工程（図４，図５参照）。
ｄ） 中壁設置区間１０ａの始終点１４での断面における本線シールドトンネル１１と分岐合流シールドトンネルとの重なり状態（図４参照）を保持したまま、長軸１３ａの長さを最短にして、接合側面部分１１ａのトンネル外郭体１５ａをさらに切削しながら分岐合流シールド掘進機１３を掘進させて、分岐合流部１０の車線擦り付け区間１０ｃを形成する工程（図６参照）。 a) A step of making the branch / merging shield machine 13 approach the branch / merging portion 10 in a state where the length of the long shaft 13a is minimized (see FIG. 2).
b) Cutting the tunnel outer body 15 of the main shield tunnel 11 at the branch junction 10 where the joining side surface portion 11a is formed using the cutting segment 15a that can be cut by the shield machine with the length of the long axis 13a extended. The step of digging the branch / merging shield machine 13 while forming the middle wall installation section 10a of the branch / merging portion 10 (see FIGS. 3 and 4).
c) The length of the long axis 13a while maintaining the overlapping state (see FIG. 4) of the main shield tunnel 11 and the branching / merging shield tunnel 12 in the cross section at the start / end point 14 (see FIG. 1) of the middle wall installation section 10a. A step of forming the lane securing section 10b of the branch merging portion 10 by digging the branch merging shield machine 13 while cutting the tunnel outer body 15a of the joint side surface portion 11a while contracting the main line shield tunnel 11 side (see FIG. 4, see FIG.
d) While maintaining the overlapping state (see FIG. 4) of the main shield tunnel 11 and the branching / merging shield tunnel in the cross-section at the start / end point 14 of the middle wall installation section 10a, A step of forming the lane rubbing section 10c of the branch and merge section 10 by excavating the branch and merge shield machine 13 while further cutting the tunnel outer body 15a of the side surface portion 11a (see FIG. 6).

また、本実施形態では、中壁設置区間１０ａの始終点１４での断面における本線シールドトンネル１１と分岐合流シールドトンネル１２との重なり状態は、図４に示すように、分岐合流シールドトンネル１２の略長円断面形状の上下の直線部分１７から本線シールドトンネル１１側の曲線部分１８へのコーナー部分１９が、各々円形断面の本線シールドトンネル１１の円周部分に位置するような位置関係で重なった状態となっている。   In the present embodiment, the overlapping state of the main shield tunnel 11 and the branch / merged shield tunnel 12 in the cross section at the start / end point 14 of the middle wall installation section 10a is substantially the same as that of the branch / merged shield tunnel 12 as shown in FIG. A state in which the corner portions 19 from the upper and lower straight portions 17 of the elliptical cross-sectional shape to the curved portion 18 on the main shield tunnel 11 side overlap with each other so as to be positioned at the circumferential portion of the main shield tunnel 11 having a circular cross section. It has become.

本実施形態によれば、長軸１３ａの長さを調整可能にして略長円断面形状のシールドトンネルを形成する機構を備える分岐合流シールド掘進機１３として、例えば特開２００１−３１７２９２号公報に記載のシールド掘進機を使用することができる。特開２００１−３１７２９２号公報に記載のシールド掘進機は、例えば、シールド本体の前部に、公転支持体をシールド軸心周りに回転自在に配設し、この公転支持体に、シールド軸心と平行で楕円シールド軸心から所定距離偏心したカッタ自転軸を回転自在に配設し、このカッタ自転軸の前部に設けられたカッタヘッドを、正面視で頂部がルーロの三角形の頂点位置に膨出する形状とし、トンネルの通常部と拡張部とを連続掘削可能としたものである。また、通常部の掘削時に、公転支持体を所定位置で固定し、カッタ自転軸を回転駆動して例えば円形に近い断面のトンネルを掘削するように構成し、拡張部の掘削時に、公転支持体とカッタ自転軸とを同一方向で回転速度比が３対１となるように回転駆動することにより、楕円形断面或いは略長円形断面のシールドトンネルを掘削するように構成したものである。   According to the present embodiment, for example, Japanese Patent Application Laid-Open No. 2001-317292 discloses a branching and merging shield machine 13 including a mechanism that can adjust the length of the long axis 13a and form a shield tunnel having a substantially oval cross-sectional shape. The shield machine can be used. In the shield machine described in Japanese Patent Laid-Open No. 2001-317292, for example, a revolution support body is rotatably disposed around the shield axis at the front part of the shield body, and the revolution support body includes a shield axis and A cutter rotation shaft that is parallel and offset by a predetermined distance from the ellipse shield axis is rotatably arranged, and the cutter head provided at the front of the cutter rotation shaft swells at the apex position of the triangle with the top portion being a luro in front view. The shape is to be extended, and the normal part and the extended part of the tunnel can be continuously excavated. Also, when excavating the normal part, the revolution support is fixed at a predetermined position, and the rotation axis of the cutter is driven to rotate, for example, a tunnel having a cross section close to a circle is excavated. And the rotating shaft of the cutter are driven to rotate in the same direction so that the rotational speed ratio is 3: 1, thereby excavating a shield tunnel having an elliptical cross section or a substantially oval cross section.

なお、本実施形態では、例えば車線幅員が３．５ｍｍの２車線の道路を設けるための分岐合流シールドトンネル１２を形成できる大きさの略長円形断面として、分岐合流シールド掘進機１３は、その短軸１３ｂの長さが例えば１０２００ｍｍ程度、最短にした状態の長軸１３ａの長さが例えば１２０００ｍｍ程度の大きさの略長円形断面を備えている。また分岐合流シールド掘進機１３は、その長軸１３ａを最短にした状態から例えば１４７００ｍｍ程度の長さまで、２７００ｍｍ程度のスライド幅ｓで長軸１３ａを伸張させることができるようになっている。さらに、本線シールドトンネル１１は、例えば車線幅員が３．２５ｍｍの３車線の道路を設けることのできる大きさの円形断面として、外径が例えば１５３００ｍｍ程度の大きさの円形断面を備えている。   In the present embodiment, for example, the branch / merge shield machine 13 has a short oval cross section having a size capable of forming a branch / merge shield tunnel 12 for providing a two-lane road with a lane width of 3.5 mm. The length of the shaft 13b is about 10200 mm, for example, and the length of the long shaft 13a in the shortest state is about 12000 mm, for example. Further, the branching / merging shield machine 13 can extend the long shaft 13a with a slide width s of about 2700 mm from a state in which the long shaft 13a is minimized to a length of about 14700 mm, for example. Further, the main line shield tunnel 11 has a circular cross section having an outer diameter of, for example, about 15300 mm as a circular cross section having a size capable of providing a three-lane road having a lane width of 3.25 mm, for example.

本実施形態のシールドトンネルの分岐合流部施工方法によれば、上記ａ）の分岐合流シールド掘進機１３を分岐合流部１０に接近させる工程では、図２に示すように、分岐合流部１０の後方において、長軸１３ａの長さを最短にした状態で分岐合流シールド掘進機１３を掘進させつつ、本線シールドトンネル１１に対して緩い角度で斜めに擦り付けるようにしながら分岐合流シールド掘進機１３を接近させる。分岐合流部１０に接近してきたら、分岐合流部１０の手前に例えば５０ｍ程度の長さの拡幅区間２０ａ（図１参照）を設けて、長軸１３ａの長さを徐々に伸張させつつ分岐合流シールド掘進機１３を掘進させ、分岐合流部１０の直前で、長軸１３ａの長さが最も伸びた状態となるようにする（図３参照）。   According to the method for constructing a branching / merging portion of the shield tunnel of the present embodiment, in the step of bringing the branching / merging shield machine 13 of a) close to the branching / merging portion 10, as shown in FIG. In FIG. 2, while the branching / merging shield machine 13 is dug in a state where the length of the long axis 13a is minimized, the branching / merging shield machine 13 is brought closer to the main shield tunnel 11 while being obliquely rubbed at a gentle angle. . When approaching the branching / merging part 10, a widening section 20a (see FIG. 1) having a length of, for example, about 50 m is provided in front of the branching / merging part 10, and the length of the long shaft 13a is gradually extended to gradually extend the branch / merging shield. The excavator 13 is excavated so that the length of the long axis 13a is maximized immediately before the branch junction 10 (see FIG. 3).

上記ｂ）の分岐合流部１０の中壁設置区間１０ａを形成する工程では、図３に示す長軸１３ａの長さが最も伸びた状態となった分岐合流シールド掘進機１３を、本線シールドトンネル１１に対してさらに斜めに擦り付けるように前進させることにより、切削セグメント１５ａによって形成された本線シールドトンネル１１の接合側面部分１１ａのトンネル外郭体１５を切削しながら、図４に示すように、分岐合流シールドトンネル１２の接合側部１２ａを本線シールドトンネル１１の接合側面部分１１ａに食い込ませて、例えば５０ｍ程度の長さの、分岐合流シールド掘進機１３の最大拡幅区間２０ｂでもある中壁設置区間１０ａを形成する（図１参照）。   In the step b) of forming the middle wall installation section 10a of the branching / merging portion 10 shown in FIG. 3, the branch / merging shield machine 13 having the longest axis 13a shown in FIG. As shown in FIG. 4, while the tunnel outer body 15 of the joint side surface portion 11a of the main line shield tunnel 11 formed by the cutting segment 15a is being cut, the branch and confluence shield is moved forward. The junction side portion 12a of the tunnel 12 is digged into the junction side surface portion 11a of the main shield tunnel 11 to form a middle wall installation section 10a which is also the maximum widening section 20b of the branching merging shield machine 13 having a length of about 50 m, for example. (See FIG. 1).

また、本実施形態では、中壁設置区間１０ａの終端部分である始終点１４では、上述のように、略長円断面形状の分岐合流シールドトンネル１２の直線部分１７から曲線部分１８へのコーナー部分１９が、本線シールドトンネル１１の円周部分に位置するような位置関係となっている。このような位置関係を保持することにより、始終点１４より先は、本線シールドトンネル１１と分岐合流シールドトンネル１２との間に中間壁２１を設けなくても、安定した構造のトンネル覆工体をトンネル１１，１２の内部に一体として設けることが可能になる。したがって、中壁設置区間１０ａの始終点１４よりも先の、分岐合流部１０の車線確保区間１０ｂや車線擦り付け区間１０ｃでは、中間壁２１を設けることなく、本線シールドトンネル１１と分岐合流シールドトンネル１２との重なり部分でこれらの接合側面部分１１ａや接合側部１２ａを撤去して、本線シールドトンネル１１と分岐合流シールドトンネル１２とが一体として連続する大きな断面のトンネル空間が形成されることになる（図５参照）。   Further, in the present embodiment, at the start / end point 14 which is the end portion of the middle wall installation section 10a, as described above, the corner portion from the straight portion 17 to the curved portion 18 of the branching / merging shield tunnel 12 having a substantially oval cross-sectional shape. 19 is in a positional relationship such that it is located in the circumferential portion of the main shield tunnel 11. By maintaining such a positional relationship, a tunnel lining body having a stable structure can be formed beyond the start / end point 14 without providing the intermediate wall 21 between the main shield tunnel 11 and the branching / merging shield tunnel 12. The tunnels 11 and 12 can be provided integrally. Therefore, in the lane securing section 10b and the lane rubbing section 10c of the branching / merging portion 10 ahead of the start / end point 14 of the middle wall installation section 10a, the main shield tunnel 11 and the branch / merging shield tunnel 12 are not provided without providing the intermediate wall 21. The joint side face portion 11a and the joint side portion 12a are removed at the overlapping portion, and a tunnel space having a large cross section is formed in which the main shield tunnel 11 and the branching / merging shield tunnel 12 are continuous as one body ( (See FIG. 5).

なお、本実施形態では、分岐合流シールド掘進機１３によって、本線シールドトンネル１１の接合側面部分１１ａを切削する作業に先立って、例えば切削セグメント１５ａを取外し容易なＰＣ鋼線を用いて周方向に緊結する工法、本線シールドトンネル１１の内部に仮設中柱を立設配置する工法、仮設中柱よりも切削セグメント１５ａ側に分岐合流シールド掘進機１３によって切削可能な貧配合固化材を充填固化する工法、分岐合流部１０の周囲の地盤に地盤改良を施す工法等が適宜採用され、工事の効率化、本線シールドトンネル１１や分岐合流シールドトンネル１２の安定化、周囲の地盤の安定化等が図られることになる。   In the present embodiment, prior to the operation of cutting the joint side surface portion 11a of the main shield tunnel 11 by the branching / merging shield machine 13, for example, the cutting segment 15a is easily removed and fastened in the circumferential direction using a PC steel wire. A construction method, a construction method in which a temporary middle pillar is erected and arranged inside the main line shield tunnel 11, a construction method in which a poorly mixed solidification material that can be cut by the branching and joining shield machine 13 is filled on the cutting segment 15a side from the temporary middle pillar, A method for improving the ground on the ground around the branch / merging section 10 is appropriately adopted to improve the efficiency of the construction, stabilize the main shield tunnel 11 and the branch / merged shield tunnel 12, and stabilize the surrounding ground. become.

また、例えば本線シールドトンネル１１の接合側面部分１１ａが切削されると共に、分岐合流シールドトンネル１２の接合側部１２ａが撤去されてから、トンネルの本体覆工が施されるまでの間、本線シールドトンネル１１の内壁面と、分岐合流シールドトンネル１２の内壁面との間に横方向仮設支持梁を設置する工法、分岐合流シールドトンネル１２の内部に仮設中柱を立設配置する工法等が適宜採用され、本線シールドトンネル１１や分岐合流シールドトンネル１２の安定化、周囲の地盤の安定化等が図られることになる。   For example, the main shield shield tunnel 11 is cut after the joint side surface portion 11a of the main shield shield 11 is cut and the joint side portion 12a of the branch / merged shield tunnel 12 is removed until the main body of the tunnel is covered. A method of installing a horizontal temporary support beam between the inner wall surface of 11 and the inner wall surface of the branch / merge shield tunnel 12, a method of standing and arranging a temporary middle pillar inside the branch / merge shield tunnel 12, etc. are appropriately employed. Thus, stabilization of the main shield tunnel 11 and the branching / merging shield tunnel 12, stabilization of the surrounding ground, and the like are achieved.

上記ｃ）の分岐合流部１０の車線確保区間１０ｂを形成する工程では、中壁設置区間１０ａの始終点１４での断面における本線シールドトンネル１１と分岐合流シールドトンネル１２との安定した重なり状態を保持したまま、図４に示す分岐合流シールド掘進機１３の長軸１３ａの長さが最も伸びた状態から、図５に示すように、長軸１３ａの長さを本線シールドトンネル１１側に収縮しつつ分岐合流シールド掘進機１３を掘進させて、例えば８０ｍ程度の長さの、分岐合流シールド掘進機１３の縮幅区間２０ｃでもある車線確保区間１０ｂを形成する（図１参照）。   In the step of forming the lane securing section 10b of the branching / merging section 10 in the above c), a stable overlapping state is maintained between the main shield tunnel 11 and the branch / merging shield tunnel 12 in the cross section at the start / end point 14 of the middle wall installation section 10a. As shown in FIG. 5, the length of the long axis 13a is contracted to the main shield tunnel 11 side from the state in which the length of the long axis 13a of the branching / merging shield machine 13 shown in FIG. The branch and merge shield machine 13 is dug to form a lane securing section 10b that is also a reduced width section 20c of the branch and merge shield machine 13 having a length of about 80 m, for example (see FIG. 1).

すなわち、車線確保区間１０ｂは、分岐合流シールドトンネル１２内の２車線の幅員を保持したまま、分岐合流シールドトンネル１２内の道路を本線シールドトンネル１１内の道路に斜めに近づけてゆく部分であり、分岐合流シールドトンネル１２内の道路が本線シールドトンネル１１内の道路に近づく分、分岐合流シールドトンネル１２の外側の部分が不要な部分となるため、長軸１３ａの長さを縮小しつつ分岐合流シールドトンネル１２の幅を狭めながら掘進してゆく区間である。   In other words, the lane securing section 10b is a portion that makes the road in the branch / merged shield tunnel 12 obliquely approach the road in the main shield tunnel 11 while maintaining the width of the two lanes in the branch / merged shield tunnel 12; As the road in the branch / merged shield tunnel 12 approaches the road in the main shield tunnel 11, the outer part of the branch / merged shield tunnel 12 becomes unnecessary, so the branch / merged shield is reduced while reducing the length of the long axis 13 a. This is a section where the tunnel 12 is dug while narrowing the width of the tunnel 12.

上記ｄ）の分岐合流部１０の車線擦り付け区間１０ｃを形成する工程では、中壁設置区間１０ａの始終点１４での断面における本線シールドトンネル１１と分岐合流シールドトンネル１２との安定した重なり状態を保持したまま、図６に示すように長軸１３ａの長さを最短にして、接合側面部分１１ａのトンネル外郭体１５ａをさらに切削しながら分岐合流シールド掘進機１３を掘進させて、例えば１２０ｍ程度の長さの、分岐合流シールド掘進機１３の標準断面区間２０ｄでもある車線擦り付け区間１０ｃを形成する（図１参照）。   In the step d) of forming the lane rubbing section 10c of the branching / merging portion 10 in the above, a stable overlapping state between the main shield tunnel 11 and the branch / merging shield tunnel 12 in the cross section at the start / end point 14 of the middle wall installation section 10a is maintained. As shown in FIG. 6, the length of the long axis 13a is made the shortest, and the branching and merging shield machine 13 is dug while further cutting the tunnel outer body 15a of the joint side surface portion 11a. The lane rubbing section 10c, which is also the standard section section 20d of the branching / merging shield machine 13 is formed (see FIG. 1).

すなわち、車線擦り付け区間１０ｃは、２車線の幅員を減少させつつ、分岐合流シールドトンネル１２内の道路を本線シールドトンネル１１内の道路に斜めに擦り付けてゆく部分である。幅員の減少に伴なって、分岐合流シールドトンネル１２内の車線外側に余分な空間２３（図１参照）が形成されることになるが、分岐合流シールド掘進機１３を本線シールドトンネル１１の内部にさらに食い込ませると、安定したトンネル１１，１２の構造を保持することが難くなることから、中壁設置区間１０ａの始終点１４での安定した重なり状態を保持したまま、長軸１３ａの長さを最短にした標準断面の分岐合流シールド掘進機１３により、これの中心軸２２ａを本線シールドトンネル１１の中心軸２２ｂと平行にしつつ掘進してゆく区間である。   In other words, the lane rubbing section 10c is a portion that rubs the road in the branch / merged shield tunnel 12 obliquely against the road in the main shield tunnel 11 while reducing the width of the two lanes. As the width is reduced, an extra space 23 (see FIG. 1) is formed outside the lane in the branch / merged shield tunnel 12, but the branch / merged shield machine 13 is placed inside the main shield tunnel 11. Furthermore, since it becomes difficult to maintain the structure of the stable tunnels 11 and 12 if it is bitten, the length of the long axis 13a is maintained while maintaining a stable overlapping state at the start and end points 14 of the middle wall installation section 10a. This is a section in which the center axis 22a is dug parallel to the center axis 22b of the main shield tunnel 11 by the branching / merging shield machine 13 having the shortest standard cross section.

また、車線擦り付け区間１０ｃでは、分岐合流シールドトンネル１２内の車線を本線シールドトンネル１１内の車線に合流させるのに必要な長さで分岐合流シールド掘進機１３による掘進を行ったら、上述のように、分岐合流シールド掘進機１３は、その終端位置に埋殺しにしたり、或いはスキンプレートを残して内部の機械や設備を撤去して、分岐合流シールドトンネル１２のトンネル外郭体１６の一部として利用されることになる。   Further, in the lane rubbing section 10c, when excavation is performed by the branch / merging shield tunneling machine 13 with a length necessary for merging the lane in the branch / merging shield tunnel 12 with the lane in the main shield tunnel 11, as described above. The branch / merge shield machine 13 is used as a part of the tunnel outer body 16 of the branch / merge shield tunnel 12 by burying it at the end position or removing the internal machine and equipment while leaving the skin plate. Will be.

そして、本実施形態のシールドトンネルの分岐合流部施工方法によれば、分岐合流シールド掘進機１３として、長軸１３ａの長さを調整可能にして略長円断面形状のシールドトンネルを形成する機構を備えるシールド掘進機を使用し、上述の工程ａ）〜ｄ）によって分岐合流部１０を形成するので、本線シールドトンネル１１の断面形状を円形に保持したまま、分岐合流シールド掘進機１３の長軸１３ａの長さを伸縮させるだけの簡易な施工工程に従って、分岐合流シールド掘進機１３で本線トンネル１１の接合側面部分１１ａを直接切削しつつ、本線トンネル１１に分岐合流トンネル１２を接合させて安定した分岐合流部１０を形成することができると共に、余分な断面部分の掘進作業や覆工作業を抑制して、効率の良い施工を行うことが可能になる。   Then, according to the method for constructing a shield tunnel branching / merging portion according to the present embodiment, as the branching / merging shield excavator 13, a mechanism for adjusting the length of the long axis 13a and forming a shield tunnel having a substantially oval cross-sectional shape is provided. Since the branch merging portion 10 is formed by the above-described steps a) to d) using the shield digging machine provided, the long axis 13a of the branch merging shield digging machine 13 while keeping the cross-sectional shape of the main shield tunnel 11 circular. In accordance with a simple construction process that simply expands and contracts the length of the cable, the branching / merging shield machine 13 directly cuts the joining side surface portion 11a of the main tunnel 11 and joins the branch / merging tunnel 12 to the main tunnel 11 for stable branching. The merge part 10 can be formed, and the excavation work and lining work of the extra cross-section part can be suppressed and efficient construction can be performed. It becomes ability.

図７は、本発明の他の実施形態に係るシールドトンネルの分岐合流部施工方法を示すものである。図７に示すシールドトンネルの分岐合流部施工方法では、分岐合流部１０の中壁設置区間１０ａを形成する工程において、分岐合流部１０の手前に拡幅区間２０ａ（図１参照）を設けるこことなく、例えば３０ｍ程度の長さの近接区間２０ｅを介して、長軸１３ａの長さを最短にした分岐合流シールド掘進機１３を分岐合流部１０に近接させる。また、例えば１２ｍ程度の長さの接触区間２０ｆにおいて分岐合流シールド掘進機１３を本線シールドトンネル１１に接触させて切削を開始してから、例えば３９ｍ程度の長さの拡幅区間２０ｇにおいて長軸１３ａの長さを本線シールドトンネル１１側に伸張して伸ばした状態としつつ、接合側面部分１１ａのトンネル外郭体１５を切削しながら分岐合流シールド掘進機１３を掘進させて、中壁設置区間１０ａを形成するようにしたものである。   FIG. 7 shows a method for constructing a branching / merging portion of a shield tunnel according to another embodiment of the present invention. In the method for constructing the junction / junction portion of the shield tunnel shown in FIG. 7, the widening section 20a (see FIG. 1) is provided in front of the junction / junction section 10 in the step of forming the middle wall installation section 10a of the junction / junction section 10. For example, the branching / merging shield machine 13 having the shortest length of the long axis 13a is brought close to the branching / merging unit 10 through the proximity section 20e having a length of about 30 m. Further, for example, in the contact section 20f having a length of about 12 m, the branching / merging shield machine 13 is brought into contact with the main shield tunnel 11 to start cutting, and then in the widening section 20g having a length of about 39 m, for example, the long axis 13a While the length is extended and extended to the main shield tunnel 11 side, the branch and merge shield machine 13 is dug while cutting the tunnel outer body 15 of the joint side surface portion 11a to form the middle wall installation section 10a. It is what I did.

図７に示すシールドトンネルの分岐合流部施工方法によっても、上記実施形態の分岐合流部施工方法と同様の作用効果が奏されると共に、分岐合流部１０の手前に拡幅区間２０ａを設けることなく、中壁設置区間１０ａに拡幅区間２０ｇを重複させて設け、長軸１３ａの長さを本線シールドトンネル１１側に伸張して伸ばした状態としつつ、接合側面部分１１ａのトンネル外郭体１５を切削しながら分岐合流シールド掘進機１３を掘進させて中壁設置区間１０ａを形成するので、図１における中壁設置区間１０ａ及び拡幅区間２０ａの車線外側の余分な空間２４を生じさせることがなくなる。これによって、例えば地上の道路幅等によって、地中における幅方向の建築限界が制限されている場合でも、このような建築限界からはみ出すことなく分岐合流部１０を形成することが可能になる。   Even with the branch and merging portion construction method of the shield tunnel shown in FIG. 7, the same effect as the branch and merging portion construction method of the above embodiment is achieved, and without providing the widened section 20a in front of the branch and merging portion 10, While widening section 20g is provided overlapping middle wall installation section 10a and the length of long axis 13a is extended and extended toward main shield tunnel 11 side, tunnel outer body 15 of joint side face portion 11a is being cut. Since the branch and merge shield machine 13 is dug to form the middle wall installation section 10a, an extra space 24 outside the lanes of the middle wall installation section 10a and the widening section 20a in FIG. 1 is not generated. Thereby, for example, even when the building limit in the width direction in the ground is limited by the road width on the ground or the like, the branching junction 10 can be formed without protruding from such a building limit.

なお、本発明は上記実施形態に限定されることなく種々の変更が可能である。例えば、本線シールドトンネルは、円形断面以外の、楕円断面や略矩形断面等を備えるシールドトンネルであっても良い。また、分岐合流部を形成する本線シールドトンネルや分岐合流シールドトンネルは、道路トンネル以外の、例えば地下鉄用のトンネルや、下水道用のトンネル等であっても良い。   The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the main line shield tunnel may be a shield tunnel having an elliptical cross section or a substantially rectangular cross section other than a circular cross section. Further, the main shield tunnel and the branch / merging shield tunnel forming the branch / merging portion may be, for example, a subway tunnel, a sewer tunnel, or the like other than the road tunnel.

本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法によって形成される分岐合流部を説明する平断面図である。It is a plane sectional view explaining the branch merge part formed by the branch merge part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法の工程を説明する図１のＡ−Ａに沿った断面図である。It is sectional drawing in alignment with the AA of FIG. 1 explaining the process of the branch merge part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法の工程を説明する図１のＢ−Ｂに沿った断面図である。It is sectional drawing in alignment with the BB of FIG. 1 explaining the process of the branch merging part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法の工程を説明する図１のＣ−Ｃに沿った断面図である。It is sectional drawing in alignment with CC of FIG. 1 explaining the process of the branch merge part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法の工程を説明する図１のＤ−Ｄに沿った断面図である。It is sectional drawing in alignment with DD of FIG. 1 explaining the process of the branch merge part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係るシールドトンネルの分岐合流部施工方法の工程を説明する図１のＥ−Ｅに沿った断面図である。It is sectional drawing along EE of FIG. 1 explaining the process of the branch merging part construction method of the shield tunnel which concerns on preferable one Embodiment of this invention. 本発明の好ましい他の実施形態に係るシールドトンネルの分岐合流部施工方法によって形成される分岐合流部を説明する平断面図である。It is a plane sectional view explaining the branch merge part formed by the branch merge part construction method of a shield tunnel concerning other desirable embodiments of the present invention. （ａ）〜（ｃ）は、従来のシールドトンネルの分岐合流部施工方法において本線トンネルに分岐合流トンネルを接合させる工程を説明する断面図である。(A)-(c) is sectional drawing explaining the process of joining a branch merging tunnel to a main line tunnel in the branch merging part construction method of the conventional shield tunnel. 従来のシールドトンネルの分岐合流部施工方法において本線トンネルに分岐合流トンネルを接合させる工程を説明する平断面図である。It is a plane sectional view explaining the process of joining a branch junction tunnel to a main line tunnel in the conventional junction junction construction method of a shield tunnel.

符号の説明Explanation of symbols

１０ 分岐合流部
１０ａ 中壁設置区間
１０ｂ 車線確保区間
１０ｃ 車線擦り付け区間
１１ 本線シールドトンネル
１１ａ 本線シールドトンネルの接合側面部分
１２ 分岐合流シールドトンネル
１２ａ 分岐合流シールドトンネルの接合側部
１３ 分岐合流シールド掘進機
１３ａ 分岐合流シールド掘進機（分岐合流シールドトンネル）の長軸
１３ｂ 分岐合流シールド掘進機（分岐合流シールドトンネル）の短軸
１４ 中壁設置区間の始終点
１５ 本線シールドトンネルのトンネル外郭体
１５ａ 切削セグメント（接合側面部分のトンネル外郭体）
１６ 分岐合流シールドトンネルのトンネル外郭体
１７ 分岐合流シールドトンネルの略長円断面形状の直線部分
１８ 分岐合流シールドトンネルの略長円断面形状の曲線部分
１９ 直線部分から曲線部分へのコーナー部分
２０ａ，２０ｇ 拡幅区間
２０ｂ 最大拡幅区間
２０ｃ 縮幅区間
２０ｄ 標準断面区間
２０ｅ 近接区間
２０ｆ 接触区間
２１ 中間壁
２２ａ 標準断面の分岐合流シールド掘進機の中心軸
２２ｂ 本線シールドトンネルの中心軸
２３，２４ 車線外側の余分な空間
ｓ 分岐合流シールド掘進機１３の長軸方向へのスライド幅
DESCRIPTION OF SYMBOLS 10 Branch / merging part 10a Middle wall installation section 10b Lane securing section 10c Lane rubbing section 11 Main shield tunnel 11a Main shield tunnel joint side surface part 12 Branch / merged shield tunnel 12a Branch / merged shield tunnel junction side 13 Branch / merged shield shield machine 13a The long axis 13b of the branch and merge shield machine (branch and merge shield tunnel) The short axis 14 of the branch and merge shield machine (branch and merge shield tunnel) The start and end points 15 of the middle wall installation section The tunnel shell 15a of the main shield tunnel The cutting segment (joint) Side tunnel exterior)
16 Tunnel outline 17 of the branch and merge shield tunnel 17 Straight portion 18 of the substantially oval cross-sectional shape of the branch and merge shield tunnel Curve portion 19 of the substantially oval cross-sectional shape of the branch and merge shield tunnel Corner portions 20a and 20g from the straight portion to the curved portion Widening section 20b Maximum widening section 20c Reduced width section 20d Standard section section 20e Proximity section 20f Contact section 21 Intermediate wall 22a Central axis 22b of the standard cross-section of the junction shield shield machine Central axes 23 and 24 of the main shield tunnel Extra extraneous lane Space s Slide width in the long axis direction of the branching / merging shield machine 13

Claims (3)

本線シールドトンネルに分岐合流シールドトンネルを接合してトンネルの分岐合流部を形成するシールドトンネルの分岐合流部施工方法であって、
前記分岐合流シールドトンネルを形成する分岐合流シールド掘進機として、長軸の長さを調整可能にして略長円断面形状のシールドトンネルを形成する機構を備えるシールド掘進機を使用し、
前記長軸の長さを最短にした状態で前記分岐合流シールド掘進機を掘進させて前記分岐合流部に接近させる工程と、
前記長軸の長さを伸ばした状態とし、シールド掘進機により切削可能な切削セグメントを用いて接合側面部分を形成した前記分岐合流部における前記本線シールドトンネルのトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の中壁設置区間を形成する工程と、
前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態を保持したまま、前記長軸の長さを前記本線シールドトンネル側に収縮しつつ、前記接合側面部分のトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の車線確保区間を形成する工程と、
前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態を保持したまま、前記長軸の長さを最短にして、前記接合側面部分のトンネル外郭体をさらに切削しながら前記分岐合流シールド掘進機を掘進させて、前記分岐合流部の車線擦り付け区間を形成する工程とを含むシールドトンネルの分岐合流部施工方法。 A method for constructing a branching / merging part of a shield tunnel in which a branching / merging shield tunnel is joined to a main line shield tunnel to form a branching / merging part of the tunnel,
As a branching / merging shield tunneling machine for forming the branching / merging shield tunnel, a shield tunneling machine having a mechanism for forming a shield tunnel having a substantially oval cross-sectional shape by adjusting the length of the long axis is used,
A step of digging up the branch merging shield machine in a state where the length of the long axis is minimized, and approaching the branch merging portion;
The branch merge while cutting the tunnel outer body of the main shield tunnel in the branch junction where the joining side surface portion is formed using a cutting segment that can be cut by a shield machine with the length of the long axis extended A step of excavating a shield machine to form a middle wall installation section of the branch and merge part;
While maintaining the overlapping state of the main shield tunnel and the branch / merged shield tunnel in the cross section at the start and end of the middle wall installation section, the length of the major axis is contracted to the main shield tunnel side while the joining is performed. Forming the lane securing section of the branch and merge part by excavating the branch and merge shield machine while cutting the tunnel outer body of the side portion;
While maintaining the overlapping state of the main shield tunnel and the branch / merged shield tunnel in the cross section at the start and end of the middle wall installation section, the length of the long axis is made the shortest, and the tunnel outer body of the joint side surface portion A method for constructing a branching / merging portion of a shield tunnel including a step of forming the lane rubbing section of the branching / merging portion by excavating the branch / merging shield excavator while further cutting. 前記分岐合流部の中壁設置区間を形成する工程では、前記長軸の長さを最短にした分岐合流シールド掘進機を前記分岐合流部に近接又は接触させた後に、前記長軸の長さを前記本線シールドトンネル側に伸張して伸ばした状態としつつ、前記接合側面部分のトンネル外郭体を切削しながら前記分岐合流シールド掘進機を掘進させる請求項１に記載のシールドトンネルの分岐合流部施工方法。   In the step of forming the middle wall installation section of the branching / merging portion, the length of the major axis is set after the branching / merging shield machine with the shortest length of the major axis is brought close to or in contact with the branching / merging portion. 2. The method for constructing a branching / merging portion of a shield tunnel according to claim 1, wherein the branching / merging shield tunneling machine is excavated while cutting a tunnel outer body of the joint side surface portion while extending and extending toward the main shield tunnel side. . 前記中壁設置区間の始終点での断面における前記本線シールドトンネルと前記分岐合流シールドトンネルとの重なり状態は、前記分岐合流シールドトンネルの略長円断面形状の上下の直線部分から本線シールドトンネル側の曲線部分へのコーナー部分が、各々円形断面の本線シールドトンネルの円周部分に位置するような位置関係で重なった状態である請求項１又は２に記載のシールドトンネルの分岐合流部施工方法。
The overlapping state of the main shield tunnel and the branch / merged shield tunnel in the cross section at the start / end of the middle wall installation section is from the upper and lower straight portions of the substantially oval cross-sectional shape of the branch / merged shield tunnel to the main shield tunnel side. The method for constructing a branching / merging portion of a shield tunnel according to claim 1 or 2, wherein the corner portion to the curved portion is overlapped in a positional relationship such that each corner portion is located in a circumferential portion of the main shield tunnel having a circular cross section.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109252873A (en) * 2018-07-26 2019-01-22 武汉大学 A plurality of intersection mountain ridge road and rail Tunnel Design construction method

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* Cited by examiner, † Cited by third party
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JP5947441B2 (en) * 2014-11-05 2016-07-06 前田建設工業株式会社 Construction method of underground widening part

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH035600A (en) * 1989-05-31 1991-01-11 Narita Nobuyuki Method and device for constructing branch and connection part of shield tunnel and its segment
JP2000145361A (en) * 1998-11-06 2000-05-26 Kajima Corp Lining member for width enlargement shield excavation and method for correction of tail clearance thereof
JP2002054384A (en) * 2000-08-09 2002-02-20 Okumura Corp Barrel part structure of expansion-contraction type tunnel excavator
JP2004316284A (en) * 2003-04-17 2004-11-11 Shimizu Corp Tunnel branch work execution method using master and slave shield machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH035600A (en) * 1989-05-31 1991-01-11 Narita Nobuyuki Method and device for constructing branch and connection part of shield tunnel and its segment
JP2000145361A (en) * 1998-11-06 2000-05-26 Kajima Corp Lining member for width enlargement shield excavation and method for correction of tail clearance thereof
JP2002054384A (en) * 2000-08-09 2002-02-20 Okumura Corp Barrel part structure of expansion-contraction type tunnel excavator
JP2004316284A (en) * 2003-04-17 2004-11-11 Shimizu Corp Tunnel branch work execution method using master and slave shield machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109252873A (en) * 2018-07-26 2019-01-22 武汉大学 A plurality of intersection mountain ridge road and rail Tunnel Design construction method

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