JP2020090819A - Reaction force receiving structure - Google Patents

Reaction force receiving structure Download PDF

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JP2020090819A
JP2020090819A JP2018227787A JP2018227787A JP2020090819A JP 2020090819 A JP2020090819 A JP 2020090819A JP 2018227787 A JP2018227787 A JP 2018227787A JP 2018227787 A JP2018227787 A JP 2018227787A JP 2020090819 A JP2020090819 A JP 2020090819A
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reaction force
temporary assembly
assembly segment
segment
force receiving
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JP7134079B2 (en
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英明 足立
Hideaki Adachi
英明 足立
金田　修一
Shuichi Kaneda
修一 金田
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Taisei Corp
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Abstract

To provide a reaction force receiving structure that making it possible to perform excavation of an early stage with a simple configuration, relatively cheap costs and a high quality.SOLUTION: A reaction force receiving structure according to the present invention includes a temporary assembled segments 4 which is assembled to the rear portion of a shield machine S, and a support frame 2 on which the temporary assembled segments 4 are mounted, and a lateral displacement prevention mechanism 6 that supports the side surface of the temporary assembled segments 4. The lateral displacement prevention mechanism 6 can advance and retract in a direction intersecting the excavation direction of the shield machine S.SELECTED DRAWING: Figure 2

Description

本発明は、シールドトンネルの初期掘進時のための反力受け構造に関する。 The present invention relates to a reaction force receiving structure for initial excavation of a shield tunnel.

シールドトンネルの初期掘進時には、シールド機の後方に形成された反力受け構造から反力を取るのが一般的である。このような反力受け構造としては、シールド機の後方に組み立てられた仮組セグメントにより形成するのが一般的である（例えば、特許文献１参照）。
初期掘進時に推進ジャッキの推力が仮組セグメントに作用すると、シールド機に比べて軽量な仮組セグメントが浮き上がるおそれがある。仮セグメントが浮き上がると、シールド機による掘進方向がズレてしまう。
そのため、従来の反力受け構造では、両端部がアンカー等により固定された線材（例えばＰＣ鋼線）を仮組セグメントの上半部分の外面に周設することで、仮組セグメントが浮き上がるのを防止する場合がある。
また、特許文献２には、坑口部に設置したケーシング内に設けられたシールド機により、ケーシングの後方に配備する仮組セグメントから反力を取って初期掘進をする場合において、仮組セグメントに装備されたストッパーにより、仮組セグメントのズレを防止するシールド機発進機構が開示されている。特許文献２のストッパーは、仮組ケーシングの外面から突出して先端をケーシング内に設けられた支持架台に押し当てることにより仮組セグメントのズレを防止している。 During the initial excavation of the shield tunnel, it is common to take the reaction force from the reaction force receiving structure formed behind the shield machine. Such a reaction force receiving structure is generally formed by a temporary assembly segment assembled at the rear of the shield machine (see, for example, Patent Document 1).
If the thrust of the propulsion jack acts on the temporary assembly segment during the initial excavation, the temporary assembly segment, which is lighter than the shield machine, may rise. If the temporary segment floats up, the excavation direction of the shield machine will shift.
Therefore, in the conventional reaction force receiving structure, a wire rod (for example, a PC steel wire) whose both ends are fixed by anchors or the like is provided around the outer surface of the upper half of the temporary assembly segment to prevent the temporary assembly segment from rising. May be prevented.
Further, in Patent Document 2, in a case where a shield machine provided in a casing installed at a wellhead portion is used to take an initial excavation by taking a reaction force from a temporary assembly segment arranged behind the casing, the temporary assembly segment is equipped with the temporary assembly segment. There is disclosed a shield machine starting mechanism that prevents the temporary assembly segment from being displaced by the stopper provided. The stopper of Patent Document 2 projects from the outer surface of the temporary assembly casing and presses its tip against a support frame provided in the casing to prevent displacement of the temporary assembly segment.

特開２００１−０２０６９３号公報Japanese Patent Laid-Open No. 2001-020969 特開２００７−０２３７７０号公報JP, 2007-023770, A

シールド工法により大断面トンネルを施工する場合において、線材のみでセグメントの浮き上がりを防止しようとすると、太径の線材を使用する必要がある。太径の線材は高価であるとともに、重量があるため、大断面の仮組セグメントの周囲に太径の線材を設置するには手間がかかる。また、大断面トンネルの仮組セグメントを上方から抑えつけることにより浮き上がりを防止しようとすると、仮組セグメントが楕円形状に変形するおそれがある。仮組セグメントが変形すると、シールド機のテールシールが損傷したり、掘進方向に影響を及ぼすおそれがある。
また、特許文献２のシールド機発進機構では、シールド機を内挿するケーシングを設ける必要があるが、大断面トンネルの施工において、シールド機を内挿するケーシングを設置するためには、多大な労力と費用を要する。
本発明は、前記の問題点を解決することを目的とするものであり、簡易な構成で、かつ、比較的安価に、初期掘進を高精度に行うことを可能とした反力受け構造を提案することを課題とする。 In the case of constructing a large cross-section tunnel by the shield method, it is necessary to use a wire rod having a large diameter in order to prevent the segment from being lifted only by the wire rod. Since a large-diameter wire rod is expensive and heavy, it takes time and effort to install the large-diameter wire rod around the temporary assembly segment having a large cross section. Further, if it is attempted to prevent the temporary assembly segment of the large-section tunnel from rising by suppressing the temporary assembly segment from above, the temporary assembly segment may be deformed into an elliptical shape. If the temporary assembly segment is deformed, the tail seal of the shield machine may be damaged or the excavation direction may be affected.
Further, in the shield machine starting mechanism of Patent Document 2, it is necessary to provide a casing into which the shield machine is inserted, but in constructing a large-section tunnel, a great amount of labor is required to install the casing into which the shield machine is inserted. And costly.
The present invention is intended to solve the above-mentioned problems, and proposes a reaction force receiving structure that has a simple structure and is capable of performing initial excavation with high accuracy at a relatively low cost. The task is to do.

前記課題を解決するための本発明の反力受け構造は、シールド機の後方に組み立てられた仮組セグメントと、前記仮組セグメントを上載する支持架台と、前記仮組セグメントの側面を支持する横ズレ防止機構とを備える反力受け構造であって、前記横ズレ防止機構は、前記シールド機の掘進方向と交差する方向に進退可能であることを特徴としている。
また、前記仮組セグメントは、注入孔を挿通させた治具を介して前記支持架台に固定されていても良い。
かかる反力受け構造によれば、横ズレ防止機構により仮組セグメントが横方向にずれることが防止されているとともに、仮組セグメントが楕円形状に変形することも防止されている。また、仮組セグメントが治具を介して支持架台に固定されているため、仮組セグメントの浮き上がりが防止されている。そのため、シールドトンネルの初期掘進時に掘進方向のズレが抑制されて、高精度に施工を行うことができる。また、大断面の線材を使用する必要がないため、簡易に構成することができ、施工性に優れている。支持架台に固定することで浮上がりが防止されているため、線材を使用する場合であっても、小断面化が可能である。 The reaction force receiving structure of the present invention for solving the above-mentioned problems is a temporary assembly segment assembled at the rear of a shield machine, a support frame on which the temporary assembly segment is mounted, and a lateral support for supporting the side surface of the temporary assembly segment. In the reaction force receiving structure including a displacement prevention mechanism, the lateral displacement prevention mechanism is capable of advancing and retracting in a direction intersecting with the excavation direction of the shield machine.
Further, the temporary assembly segment may be fixed to the support frame via a jig having an injection hole inserted therethrough.
According to this reaction force receiving structure, the temporary displacement segment is prevented from shifting laterally by the lateral displacement prevention mechanism, and the temporary configuration segment is also prevented from being deformed into an elliptical shape. Moreover, since the temporary assembly segment is fixed to the support frame via the jig, the temporary assembly segment is prevented from rising. Therefore, when the shield tunnel is initially excavated, the displacement in the excavation direction is suppressed, and the construction can be performed with high accuracy. Further, since it is not necessary to use a wire material having a large cross section, it can be simply configured and is excellent in workability. Since it is prevented from rising by being fixed to the support frame, it is possible to reduce the cross section even when using a wire rod.

本発明の反力受け構造によれば、簡易な構成で、かつ、比較的安価に、初期掘進を高精度に行うことが可能となる。 According to the reaction force receiving structure of the present invention, it is possible to perform the initial excavation with high accuracy with a simple configuration and at a relatively low cost.

本発明の反力受け構造を含むシールド機の発進設備平面図である（図２のＢ−Ｂ矢視）。FIG. 3 is a plan view of starting equipment of a shield machine including the reaction force receiving structure of the present invention (viewed from the arrow BB in FIG. 2 ). 本発明の反力受け構造の断面図である（図１のＡ−Ａ矢視）。It is sectional drawing of the reaction force receiving structure of this invention (AA arrow of FIG. 1). 本発明の反力受け構造である横ズレ防止機構の構造断面図である（図２のＣ部）。It is a structure sectional view of a lateral gap prevention mechanism which is a reaction force receiving structure of the present invention (C section of Drawing 2). 本発明の反力受け構造であるセグメントの支持架台固定の構造断面図である（図２のＤ部）。FIG. 3 is a structural cross-sectional view of fixing the support frame of the segment which is the reaction force receiving structure of the present invention (portion D in FIG. 2 ).

以下に、本発明の実施形態について、図面を参照しながら説明する。
＜全体構成＞
図１に図２のＢ−Ｂ矢視図であり、本発明の反力受け構造を含むシールド機の発進設備平面図を示す。
本実施形態におけるシールド機の発進設備は、地盤Ｇに構築された立坑１内に設けられている。立坑１はグラウンドアンカー１２より支保されている土留め壁１１よりなる平面視矩形形状を呈している。一方の面の土留め壁１１に設置された発進エントランス３に対向するように、他方の面に反力設備５が設けられている。土留め壁１１は、ＳＭＷ工法（ソイルミキシングウォール工法）にて構築されている。ＳＭＷ工法とは、不図示の多軸混練オーガー機で原地盤を削孔し、その先端よりセメントスラリーを吐出して削孔した地山と混練することで、ＳＭＷ壁体（ソイルセメント壁体）を造るものである。本実施形態では、各削孔ごとにＨ形鋼である芯材が埋設された状態でＳＭＷ壁体を硬化させることで、芯材の周囲をＳＭＷ壁体が覆った状態で一体化されるので、止水性を兼ねた備えた剛性の高い土留め壁１１が構築される。
シールド機Ｓは、立坑１内に発進エントランス３内を通過できるように組立て・配置されている。 Embodiments of the present invention will be described below with reference to the drawings.
<Overall structure>
FIG. 1 is a BB arrow view of FIG. 2 and shows a plan view of starting equipment of a shield machine including a reaction force receiving structure of the present invention.
The starting equipment of the shield machine in the present embodiment is provided in the shaft 1 built in the ground G. The shaft 1 has a rectangular shape in plan view, which is composed of an earth retaining wall 11 supported by a ground anchor 12. Reaction force equipment 5 is provided on the other surface so as to face the starting entrance 3 installed on the earth retaining wall 11 on the one surface. The earth retaining wall 11 is constructed by the SMW method (soil mixing wall method). The SMW method is a SMW wall body (soil cement wall body) that is drilled with a multi-axis kneading auger machine (not shown) to drill the ground Is what builds. In the present embodiment, the SMW wall body is hardened in a state where the H-shaped steel core material is embedded in each drilled hole, so that the SMW wall body is integrated with the core material around the core material. A highly rigid earth retaining wall 11 that also has a water blocking property is constructed.
The shield machine S is assembled and arranged in the vertical shaft 1 so that it can pass through the starting entrance 3.

仮組セグメント４は、シールド機Ｓ内で複数のセグメントピースをリング状に組み立てることで形成されたセグメントリング４１を、シールド機Ｓ内に装備された油圧ジャッキＳ１にてシールド機Ｓの後方に順次押し出すことで複数のセグメントリング４１，４１・・・が継手により連結されて形成されている。
最初に組み立てられたセグメントリング４１が反力設備５に当接されることで、油圧ジャッキＳ１から付与される推力が仮組セグメント４から反力設備５に伝達され、反力設備５の背面に存在する地盤Ｇに伝達されることで、シールド機Ｓを前方に推進させるための反力が確保できる。反力設備５は、鋼材の骨組みやコンクリート壁等の公知の構成からなり、ここでの説明は省略する。
ここで、仮組セグメント４には、シールド機Ｓ側から油圧ジャッキＳ１による推力と、反力設備５側からその反力とがそれぞれ作用するため、例えば仮組セグメント４の下方に偏心荷重が作用する場合、仮組セグメント４が上方に弓なりに膨らむように浮き上がる可能性がある。
この現象によって、仮組セグメント４自体が損傷を受けたり、仮組セグメント４の一部を内包するシールド機Ｓの後胴部が仮組セグメント４に突き上げられるように浮き上がる可能性もある。係る現象の発生を許容することは、施工品質管理上、安全管理上ともに好ましくないので、仮組セグメント４の浮き上がりを規制する対策が必要となる。つまり、仮組セグメント４の浮き上がりによって生じる反力を受ける構造を仮組セグメント４の所定の位置に設けることで対応することができる。
そこで本実施形態では、仮組セグメント４の浮き上がり防止措置としての反力受け構造として、以下の対策を採用している。
仮組セグメント４の水平方向の変動を規制するための横ズレ防止機構６と、仮セグメント４の下部を下方からの引張り力で上下方向の変動を規制するための支持架台固定治具７の２つである。 In the temporary assembly segment 4, the segment ring 41 formed by assembling a plurality of segment pieces in a ring shape in the shield machine S is sequentially arranged behind the shield machine S by a hydraulic jack S1 equipped in the shield machine S. By extruding, a plurality of segment rings 41, 41,... Are connected by a joint.
When the segment ring 41 assembled first is brought into contact with the reaction force equipment 5, the thrust force applied from the hydraulic jack S1 is transmitted from the temporary assembly segment 4 to the reaction force equipment 5, and the rear surface of the reaction force equipment 5 is provided. By being transmitted to the existing ground G, a reaction force for propelling the shield machine S forward can be secured. The reaction equipment 5 has a known structure such as a steel frame and a concrete wall, and a description thereof will be omitted here.
Here, since the thrust by the hydraulic jack S1 from the shield machine S side and the reaction force from the reaction force equipment 5 side act on the temporary assembly segment 4, respectively, for example, an eccentric load acts below the temporary assembly segment 4. In that case, the temporary assembly segment 4 may float upward so as to bulge upward.
Due to this phenomenon, the temporary assembly segment 4 itself may be damaged, or the rear trunk of the shield machine S including a part of the temporary assembly segment 4 may be lifted up so as to be pushed up to the temporary assembly segment 4. Allowing the occurrence of such a phenomenon is unfavorable in terms of construction quality control and safety control, so it is necessary to take measures to control the rise of the temporary assembly segment 4. That is, it is possible to deal with this by providing a structure for receiving a reaction force generated by the lifting of the temporary assembly segment 4 at a predetermined position of the temporary assembly segment 4.
Therefore, in the present embodiment, the following measures are adopted as the reaction force receiving structure as a lifting prevention measure for the temporary assembly segment 4.
A horizontal displacement prevention mechanism 6 for restricting the horizontal movement of the temporary assembly segment 4 and a support frame fixing jig 7 for restricting the vertical movement of the lower portion of the temporary segment 4 by a pulling force from below. Is one.

図２に図１のＡ−Ａ矢視であり、本発明の反力受け構造の断面図を、図３に図２のＣ部であり、本発明の反力受け構造である横ズレ防止機構の構造断面図を、図４に図２のＤ部であり、本発明の反力受け構造であるセグメントの支持架台固定の構造断面図をそれぞれ示す。
以降、反力受け構造の各構造について、図２〜図４を用いて説明する。 2 is a cross-sectional view of the reaction force receiving structure of the present invention taken along the line AA of FIG. 1, and FIG. 3 is a C portion of FIG. 2 showing the lateral displacement prevention mechanism which is the reaction force receiving structure of the present invention. 4 is a structural cross-sectional view of the portion D of FIG. 2 for fixing the support frame of the segment, which is the reaction force receiving structure of the present invention, in FIG.
Hereinafter, each structure of the reaction force receiving structure will be described with reference to FIGS.

＜横ズレ防止機構＞
図２より、本実施形態の横ズレ防止機構６，６は、仮組セグメント４の側方に立設する土留め壁１１，１１に固定されている。横ズレ防止機構６，６は、仮組セグメント４を左右外側から挟むように配置されており、理想的には仮組セグメント４の設計上の中心点を通過するスプリングラインＳＬ上（水平線上）で、かつ設計上の仮組セグメント４の外面に当接するように配置されていることが望ましい。しかし、実際に組み立てられた仮組セグメント４は、施工誤差や製造誤差等の様々な要因により、必ずしも真円ではなく、設計上の所望する位置に配置されていないことの方が多い。
したがって、本実施形態における横ズレ防止機構６，６は、組み立てられた仮組セグメント４の凡そのスプリングラインＳＬ上の外面から許容変位量に相当する１０ｍｍ程度の隙間δを設けて当接するように配置されている（図３参照のこと。）。 <Horizontal misalignment prevention mechanism>
As shown in FIG. 2, the lateral displacement prevention mechanisms 6 and 6 of the present embodiment are fixed to the earth retaining walls 11 and 11 standing upright on the side of the temporary assembly segment 4. The lateral displacement prevention mechanisms 6 and 6 are arranged so as to sandwich the temporary assembly segment 4 from the left and right sides, and ideally on the spring line SL (on the horizontal line) that passes through the designed center point of the temporary assembly segment 4. In addition, it is desirable to be arranged so as to contact the outer surface of the temporary assembly segment 4 in design. However, the temporarily assembled segment 4 actually assembled is not necessarily a perfect circle due to various factors such as construction errors and manufacturing errors, and is often not arranged at a desired position in design.
Therefore, the lateral displacement prevention mechanisms 6 and 6 according to the present embodiment are provided so as to come into contact with each other by providing a gap δ of about 10 mm from the outer surface of the assembled temporary assembly segment 4 on the approximate spring line SL. It is located (see Figure 3).

図３より、１組の横ズレ防止機構６は、Ｈ形鋼である当接材６１、梁材６２，６２、接続材６３，６３、及びジャッキ６４，６４とからなる。
当接材６１は、フランジ面が仮組セグメント４に当接するように鉛直に配置され、当接材６１に直交するように、当接材６１の背面フランジの上下に、梁材６２，６２、ジャッキ６４，６４、接続材６３，６３の順に溶接により一体に接続されている。πの字を紙面反時計回りに９０度回転させたような形状である。
横ズレ防止機構６は、接続材６３，６３の端部を土留め壁１１の芯材に溶接して固定されている。ジャッキ６４を調整することによって、仮組セグメント４の外面からの配置を微調整するとともに、油圧ジャッキを採用すれば、仮組セグメント４が当接材６１に当接した場合であっても、油圧により、仮組セグメント４に過度な集中荷重が作用することを抑制し、セグメントの損壊を緩和できる。
また、同じ理由から、当接材６１の当接面にゴム製の板材であるパッド６５を貼り付けておくことが望ましい。 As shown in FIG. 3, one set of the lateral displacement prevention mechanism 6 is composed of an H-shaped steel contact member 61, beam members 62 and 62, connecting members 63 and 63, and jacks 64 and 64.
The abutting member 61 is arranged vertically so that the flange surface abuts the temporary assembly segment 4, and the beam members 62, 62 are provided above and below the rear flange of the abutting member 61 so as to be orthogonal to the abutting member 61. The jacks 64, 64 and the connecting members 63, 63 are integrally connected by welding in this order. The shape is such that the letter π is rotated 90 degrees counterclockwise in the drawing.
The lateral displacement prevention mechanism 6 is fixed by welding the ends of the connecting members 63, 63 to the core member of the earth retaining wall 11. By adjusting the jack 64, the placement of the temporary assembly segment 4 from the outer surface is finely adjusted, and if a hydraulic jack is adopted, even if the temporary assembly segment 4 abuts on the abutting member 61, the hydraulic pressure is reduced. As a result, it is possible to suppress the excessive concentrated load from acting on the temporary assembly segment 4 and reduce the damage of the segment.
For the same reason, it is desirable to attach the pad 65, which is a rubber plate material, to the contact surface of the contact material 61.

＜支持架台固定治具＞
図２より、仮組セグメント４は、多数の形鋼から形成される支持架台２上にトンネル軸方向に平行に固定された複数のレール材２１，２１・・・の上に、複数のキャンバー２２，２２・・・を介して載置されている。支持架台固定治具７は、後述するＰＣ鋼棒を主材として、仮組セグメント４の内面側から支持架台２に定着させることで、仮セグメント４の上方への浮き上がりを抑制している。 <Supporting platform fixing jig>
As shown in FIG. 2, the temporary assembly segment 4 has a plurality of cambers 22 on a plurality of rail members 21, 21... Fixed on a support base 2 formed of a large number of shaped steels in parallel with the tunnel axis direction. , 22... The support base fixing jig 7 suppresses the temporary segment 4 from rising upward by fixing the support steel base 2 from the inner surface side of the temporary assembly segment 4 to the support base 2 by using a PC steel rod described later as a main material.

図４より、１組の支持架台固定治具７は、ＰＣ鋼棒７１と、Ｃ形鋼材７２，７２・・・と、座金７３，７３・・・と、ナット７４，７４とからなり、仮組セグメント４のレールに近傍する箇所に位置するセグメントピースに予め設けられた注入孔４２を挿通して支持架台２に固定される。
具体的には、ＰＣ鋼棒７１は、セグメントの注入孔４２に挿通し、セグメントの内面側からＰＣ鋼棒７１を挟むように対向する２つのＣ形鋼材７２，７２を配置し、Ｃ形鋼材７２，７２の頭部を跨ぎ、係止するようにＰＣ鋼棒７１の上部から座金７３を挿通し、ナット７４で螺合されている。注入孔４２を挿通されたＰＣ鋼棒７１は、支持架台２のフランジ面に設けられた貫通孔２３に挿通され、セグメントの内面側と同様に、該フランジ面に係止するように、該フランジ面の背面側から挿通されたＰＣ鋼棒７１を挟むように２つのＣ形鋼材７２，７２を配置し、Ｃ形鋼材７２，７２の頭部を跨ぎ、係止するようにＰＣ鋼棒７１の上部から座金７３を挿通し、ナット７４で螺合されている。 As shown in FIG. 4, one set of support pedestal fixing jigs 7 includes a PC steel rod 71, C-shaped steel materials 72, 72,..., Washers 73, 73,..., Nuts 74, 74. The segment piece located near the rail of the assembly segment 4 is fixed to the support base 2 by inserting an injection hole 42 provided in advance in the segment piece.
Specifically, the PC steel rod 71 is inserted into the injection hole 42 of the segment, and two C-shaped steel materials 72, 72 facing each other so as to sandwich the PC steel rod 71 from the inner surface side of the segment are arranged. A washer 73 is inserted from the upper part of the PC steel rod 71 so as to straddle the heads of the 72 and 72 and be locked, and is screwed with a nut 74. The PC steel rod 71, which has been inserted through the injection hole 42, is inserted through the through hole 23 provided in the flange surface of the support frame 2, and is engaged with the flange surface in the same manner as the inner surface side of the segment. The two C-shaped steel members 72, 72 are arranged so as to sandwich the PC steel rod 71 inserted from the back side of the surface, and the heads of the C-shaped steel members 72, 72 are straddled so that the PC steel rod 71 is locked. A washer 73 is inserted from the upper part and screwed with a nut 74.

以上より、本実施形態に係る反力受け構造によれば、横ズレ防止機構により仮組セグメントが横方向にずれることが防止されているとともに、仮組セグメントが楕円形状に変形することも防止されている。また、仮組セグメントが治具を介して支持架台に固定されているため、仮組セグメントの浮き上がりが防止されている。そのため、シールドトンネルの初期掘進時に掘進方向のズレが抑制されて、高精度に施工を行うことができる。また、大断面の線材を使用する必要がないため、簡易に構成することができ、施工性に優れている。支持架台に固定することで浮上がりが防止されているため、線材を使用する場合であっても、小断面化が可能である。 As described above, according to the reaction force receiving structure of the present embodiment, the lateral displacement prevention mechanism prevents the temporary assembly segment from shifting in the lateral direction, and also prevents the temporary assembly segment from deforming into an elliptical shape. ing. Moreover, since the temporary assembly segment is fixed to the support frame via the jig, the temporary assembly segment is prevented from rising. Therefore, when the shield tunnel is initially excavated, the displacement in the excavation direction is suppressed, and the construction can be performed with high accuracy. Further, since it is not necessary to use a wire material having a large cross section, it can be simply configured and is excellent in workability. Since it is prevented from rising by being fixed to the support frame, it is possible to reduce the cross section even when using a wire rod.

以上、本発明の実施形態について説明したが、本発明は前記の実施形態に限られず、本発明の趣旨を逸脱しない範囲で適宜変更が可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit of the present invention.

Ｇ 地盤
Ｓ シールド機
Ｓ１ 油圧ジャッキ
ＳＬ スプリングライン
δ 隙間
１ 立坑
１１ 土留め壁
１２ グラウンドアンカー
１３ 基礎コンクリート
１４ 底版
２ 支持架台
２１ レール材
２２ キャンバー
２３ 貫通孔
３ 発進エントランス
４ 仮組セグメント
４１ セグメントリング
４２ 注入孔
５ 反力設備
６ 横ズレ防止機構
６１ 当接材
６２ 梁材
６３ 接続材
６４ ジャッキ
６５ パッド
７ 支持架台固定治具
７１ ＰＣ鋼棒
７２ Ｃ形鋼材
７３ 座金
７４ ナット G Ground S Shielding machine S1 Hydraulic jack SL Spring line δ Gap 1 Vertical shaft 11 Earth retaining wall 12 Ground anchor 13 Foundation concrete 14 Bottom slab 2 Support platform 21 Rail material 22 Camber 23 Through hole 3 Start entrance 4 Temporary assembly segment 41 Segment ring 42 Injection Hole 5 Reaction force equipment 6 Lateral displacement prevention mechanism 61 Abutment material 62 Beam material 63 Connection material 64 Jack 65 Pad 7 Support stand fixing jig 71 PC steel rod 72 C-shaped steel material 73 Washer 74 Nut

Claims (2)

シールド機の後方に組み立てられた仮組セグメントと、
前記仮組セグメントを上載する支持架台と、
前記仮組セグメントの側面を支持する横ズレ防止機構と、を備える反力受け構造であって、
前記横ズレ防止機構は、前記シールド機の掘進方向と交差する方向に進退可能であることを特徴とする、反力受け構造。 A temporary assembly segment assembled behind the shield machine,
A support platform on which the temporary assembly segment is mounted,
A reaction force receiving structure including a lateral displacement prevention mechanism that supports a side surface of the temporary assembly segment,
The reaction force receiving structure, wherein the lateral displacement prevention mechanism is capable of advancing and retreating in a direction intersecting the excavation direction of the shield machine. 前記仮組セグメントは、注入孔を挿通させた治具を介して前記支持架台に固定されていることを特徴とする請求項１に記載の反力受け構造。 The reaction force receiving structure according to claim 1, wherein the temporary assembly segment is fixed to the support base via a jig having an injection hole inserted therein.
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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154607U (en) * 1978-04-19 1979-10-27
JPS55122999A (en) * 1979-03-12 1980-09-22 Nishimatsu Constr Co Ltd Segment for shield temporary assembly
JPS5631993A (en) * 1979-08-24 1981-03-31 Uemura Koichi Method and device for causing reaction force
JPH03199596A (en) * 1989-12-28 1991-08-30 Yoshinori Tateishi Shaft advance construction for shield
JPH04149391A (en) * 1990-10-12 1992-05-22 Fujita Corp Method of propulsion from middle vertical shaft
JP2002364289A (en) * 2001-06-06 2002-12-18 Kidoh Construction Co Ltd Device and propulsion pipe for preventing backing
JP2003113697A (en) * 2001-10-04 2003-04-18 Okumura Corp Mechanism and method for starting shield machine
JP2003227290A (en) * 2002-01-31 2003-08-15 Kidoh Construction Co Ltd Shift preventing device for embedded pipe line in jacking method
JP2006002344A (en) * 2004-06-15 2006-01-05 Kajima Corp Jacking auxiliary device for shielding machine and jacking method for shielding machine
JP2007023770A (en) * 2006-11-02 2007-02-01 Okumura Corp Mechanism and method for starting shield machine
JP2014201897A (en) * 2013-04-02 2014-10-27 Ｓｍｃコンクリート株式会社 Backing prevention device
JP2016132945A (en) * 2015-01-21 2016-07-25 戸田建設株式会社 Starting device for steel shell element, and adjustment method using the same for adjusting starting direction of steel shell element

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154607U (en) * 1978-04-19 1979-10-27
JPS55122999A (en) * 1979-03-12 1980-09-22 Nishimatsu Constr Co Ltd Segment for shield temporary assembly
JPS5631993A (en) * 1979-08-24 1981-03-31 Uemura Koichi Method and device for causing reaction force
JPH03199596A (en) * 1989-12-28 1991-08-30 Yoshinori Tateishi Shaft advance construction for shield
JPH04149391A (en) * 1990-10-12 1992-05-22 Fujita Corp Method of propulsion from middle vertical shaft
JP2002364289A (en) * 2001-06-06 2002-12-18 Kidoh Construction Co Ltd Device and propulsion pipe for preventing backing
JP2003113697A (en) * 2001-10-04 2003-04-18 Okumura Corp Mechanism and method for starting shield machine
JP2003227290A (en) * 2002-01-31 2003-08-15 Kidoh Construction Co Ltd Shift preventing device for embedded pipe line in jacking method
JP2006002344A (en) * 2004-06-15 2006-01-05 Kajima Corp Jacking auxiliary device for shielding machine and jacking method for shielding machine
JP2007023770A (en) * 2006-11-02 2007-02-01 Okumura Corp Mechanism and method for starting shield machine
JP2014201897A (en) * 2013-04-02 2014-10-27 Ｓｍｃコンクリート株式会社 Backing prevention device
JP2016132945A (en) * 2015-01-21 2016-07-25 戸田建設株式会社 Starting device for steel shell element, and adjustment method using the same for adjusting starting direction of steel shell element

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