JP2017036567A - Structure and method for supporting earth-retaining wall - Google Patents

Structure and method for supporting earth-retaining wall Download PDF

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JP2017036567A
JP2017036567A JP2015157265A JP2015157265A JP2017036567A JP 2017036567 A JP2017036567 A JP 2017036567A JP 2015157265 A JP2015157265 A JP 2015157265A JP 2015157265 A JP2015157265 A JP 2015157265A JP 2017036567 A JP2017036567 A JP 2017036567A
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retaining wall
ground
ground anchor
arm member
erection
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JP6606911B2 (en
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康雄 元井
Yasuo Motoi
康雄 元井
健一 三栖
Kenichi Misu
健一 三栖
真平 富田
Shimpei Tomita
真平 富田
栄治 堀内
Eiji Horiuchi
栄治 堀内
有希 佐藤
Yuki Sato
有希 佐藤
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Obayashi Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a structure and a method for supporting an earth-retaining wall capable of efficiently supporting an earth-retaining wall when a ground anchor construction method is applied to a timbering of the earth-retaining wall, even when there are limitations with ground conditions and site conditions.SOLUTION: A deformation suppressing structure of an earth-retaining wall comprises an arm member connected on a rear surface side of a head part of each of a plurality of vertical members constituting the earth-retaining wall, a wale spanned to connect each of a plurality of the arm members, and a plurality of ground anchors of which a head part is anchored to the wale. An angular adjustment member is provided on the arm member for adjusting a top surface of the wale such that the top surface becomes a surface orthogonal to the ground anchor. The wale is installed on a top surface of the angular adjustment member.SELECTED DRAWING: Figure 1

Description

本発明は、支保工に地盤アンカーを用いた山留め壁の支持構造および山留め壁の支持工法に関する。   The present invention relates to a support structure for a retaining wall using a ground anchor for a support work and a supporting method for the retaining wall.

地盤を掘削して地下構造物を築造する場合、山留め壁を構築した後に、その内側の地盤の掘削工事を行なう。このとき、根切り部分において山留め壁が周囲の土圧により変形もしくは転倒し、これに伴って周辺地盤に沈下等の大規模な変状が発生するおそれがある。このような山留め壁の変形もしくは転倒を抑止するべく、山留め壁の支保工として、地盤アンカーを用いる工法が知られている。地盤アンカー工法は、一般に、地盤アンカーを山留め壁の背面側に水平に対して約３０〜４５°傾斜させて打設し、腹起しを介して頭部を山留め壁に定着するとともに、定着体を良質な地盤に定着させることで、山留め壁を支持する方法である。   When excavating the ground and constructing an underground structure, after constructing a retaining wall, excavation work is performed on the ground inside. At this time, the retaining wall may be deformed or toppled by the surrounding earth pressure at the root cutting portion, and there is a risk that large-scale deformation such as subsidence may occur in the surrounding ground. In order to suppress such deformation or falling of the retaining wall, a method using a ground anchor is known as a retaining structure for the retaining wall. In general, the ground anchor method is a method in which the ground anchor is placed on the back side of the mountain retaining wall at an angle of about 30 to 45 ° with respect to the horizontal, and the head is fixed to the mountain retaining wall via the abdomen, and the fixing body. This is a method of supporting the mountain retaining wall by fixing it to a good quality ground.

上記の方法は、切梁工法と比較して掘削工事の障害となりにくい工法であるが、山留め壁の背面側に地盤アンカーを定着させるための十分な敷地が確保できない場合、敷地境界線を跨いで地盤アンカーを定着せざるを得ず、隣接する所有者の使用許可を得る必要が生じる等、手間が煩雑である。このような中、山留め壁と敷地境界との間隔が狭隘な場合にも、山留め壁の支保工に地盤アンカーを採用することのできる山留め壁の支持方法が、特許文献１に開示されている。   The above method is a method that is less likely to be an obstacle to excavation work than the beam construction method, but if there is not enough site to anchor the ground anchor on the back side of the retaining wall, it will straddle the boundary line of the site. The ground anchor has to be fixed, and it is necessary to obtain permission for use by the adjacent owner. Under such circumstances, Patent Document 1 discloses a method for supporting a retaining wall in which a ground anchor can be used for supporting the retaining wall even when the distance between the retaining wall and the site boundary is narrow.

特許文献１は、山留め壁頭部の背面側に、水平に延在するアーム部材を接合するとともに、地山に地盤アンカーを鉛直状に打設し、当該地盤アンカーの頭部をアーム部材の先端に定着させ、鉛直状に打設した地盤アンカーに緊張力を導入し、アーム部材を介して山留め壁の頭部にモーメントを作用させる方法である。これにより、山留め壁と敷地境界との間隔が狭隘な場合にも、山留め壁の頭部を背面側に変位させることができ、山留め壁の掘削領域側への変形もしくは転倒を抑止することが可能となるものである。   In Patent Document 1, an arm member that extends horizontally is joined to the back side of the head portion of the retaining wall, and a ground anchor is driven vertically on the ground, and the head of the ground anchor is placed at the tip of the arm member. This is a method in which a tension force is introduced into a ground anchor placed in a vertical position and a moment is applied to the head of the retaining wall via an arm member. As a result, even when the distance between the retaining wall and the site boundary is narrow, the head of the retaining wall can be displaced to the back side, and deformation or falling of the retaining wall to the excavation area side can be suppressed. It will be.

特開２０１３−１３６９２２号公報JP 2013-136922 A

しかし、特許文献１に記載の山留め壁の支持方法では、山留め壁の頭部に水平力を作用させることができないため、例えば地山が軟弱地盤であって山留め壁に作用する側圧が大きい場合に、掘削工事に伴う山留め壁の掘削領域側への変形を抑止することが困難である。   However, in the supporting method of the retaining wall described in Patent Document 1, since a horizontal force cannot be applied to the head of the retaining wall, for example, when the ground is soft ground and the lateral pressure acting on the retaining wall is large. It is difficult to suppress the deformation of the retaining wall due to excavation work to the excavation area side.

本発明は、かかる課題に鑑みなされたものであって、その主な目的は、山留め壁の支保工に地盤アンカー工法を適用するにあたり、地盤条件および敷地条件に制約がある場合にも、効率よく山留め壁を支持することの可能な、山留め壁の支持構造および山留め壁の支持工法を提供することである。   The present invention has been made in view of such problems, and its main purpose is to efficiently apply the ground anchor method to the support of the retaining wall even when there are restrictions on the ground conditions and site conditions. A mountain retaining wall support structure and a mountain retaining wall supporting method capable of supporting the mountain retaining wall are provided.

かかる目的を達成するため本発明の山留め壁の支持構造は、山留め壁を構成する複数の鉛直部材各々の頭部であって背面側に接合されるアーム部材、複数の該アーム部材各々に架け渡される腹起し、および該腹起しに頭部を定着され、鉛直に対して傾斜角度を有する複数の地盤アンカーよりなる、山留め壁の支持構造であって、前記アーム部材上に、前記腹起しの上面を前記地盤アンカーと直交する面となるよう調整する角度調整部材が設置されており、該角度調整部材の上面に、前記腹起しが設置されることを特徴とする。   In order to achieve such an object, the support structure of the retaining wall of the present invention includes an arm member that is the head of each of the plurality of vertical members constituting the retaining wall and is joined to the back surface, and spans each of the plurality of arm members. And a support structure for a retaining wall comprising a plurality of ground anchors having an inclination angle with respect to the vertical, the head being fixed to the erection, and the erection erection on the arm member. An angle adjustment member for adjusting the upper surface of the ridge to be a surface orthogonal to the ground anchor is installed, and the erection is installed on the upper surface of the angle adjustment member.

本発明の山留め壁の支持構造は、前記山留め壁の背面側に地盤改良体が構築され、
該地盤改良体に、前記地盤アンカーの定着体が定着されることを特徴とする。 In the support structure of the retaining wall of the present invention, a ground improvement body is constructed on the back side of the retaining wall,
The ground anchor fixing body is fixed to the ground improvement body.

本発明の山留め壁の支持工法は、山留め壁を構成する複数の鉛直部材各々の頭部であって背面側にアーム部材を接合するとともに、該アーム部材上に腹起しを設置した後、複数の地盤アンカーを、鉛直に対して傾斜角度を有するように地山に打設し、頭部を前記腹起しに定着して、地盤アンカーに緊張力を導入する山留め壁の支持方法であって、前記アーム部材上に、前記腹起しの上面を前記地盤アンカーと直交する面となるよう調整する角度調整部材を設置し、該角度調整部材の上面に、前記腹起しを設置することを特徴とする。   The supporting method of the retaining wall according to the present invention includes a plurality of vertical members constituting the retaining wall, each of which is a head portion of each of the vertical members, and an arm member is joined to the back side, and a plurality of erections are installed on the arm member. A method for supporting a retaining wall, in which a ground anchor is placed on a natural ground so as to have an inclination angle with respect to the vertical, a head is fixed to the abdomen, and tension is introduced into the ground anchor. Installing an angle adjustment member on the arm member for adjusting the upper surface of the erection to be a surface orthogonal to the ground anchor, and installing the erection on the upper surface of the angle adjustment member. Features.

本発明によれば、山留め壁の頭部であって背面に接合したアーム部材の上面に、鉛直に対して傾斜角度を有する地盤アンカーから押圧力を作用させることにより、地盤アンカーを鉛直に打設する場合と比較して、山留め壁の頭部にモーメントのみでなく、水平力を作用させることができるため、小さい導入緊張力にて山留め壁の頭部における背面側への変位量を増大させることが可能となる。   According to the present invention, the ground anchor is vertically driven by applying a pressing force from the ground anchor having an inclination angle with respect to the vertical on the upper surface of the arm member joined to the back surface of the head of the retaining wall. Compared to the case of doing so, not only moment but also horizontal force can be applied to the head of the retaining wall, so that the amount of displacement of the retaining wall head to the back side is increased with a small introduction tension. Is possible.

また、腹起しを介して山留め壁に頭部を定着する従来の地盤アンカー工法と比較して、鉛直に対する地盤アンカーの傾斜角度を大幅に小さくすることができ、山留め壁と敷地境界との間隔が狭隘な場合にも、支保工に地盤アンカーを採用することが可能となる。   In addition, compared to the conventional ground anchor method that fixes the head to the retaining wall via the erection, the inclination angle of the ground anchor with respect to the vertical can be greatly reduced, and the distance between the retaining wall and the site boundary It is possible to employ ground anchors for the support work even when the width is narrow.

さらに、角度調整部材にて腹起しの上面に地盤アンカーと直交する面を形成できることから、鉛直に対して傾斜角度を有する地盤アンカーに緊張力を導入しても、腹起しが水平方向にたわみ等の変形を生じることなく、地盤アンカーの頭部から作用される押圧力を、各アーム部材にスムーズに伝達する。こうして伝達された押圧力はアーム部材にて、アーム部材を下方向に押し下げる鉛直下方向の分力と、アーム部材を山留め壁の背面側に移動させようとする水平方向の分力に分解されるため、山留め壁の頭部にモーメントと水平力を、効率よく同時に作用させることが可能となる。   Furthermore, since the surface that is perpendicular to the ground anchor can be formed on the upper surface of the erection by the angle adjustment member, even if tension is introduced to the ground anchor that has an inclination angle with respect to the vertical, the erection is horizontal. The pressing force applied from the head of the ground anchor is smoothly transmitted to each arm member without causing deformation such as deflection. The pressing force transmitted in this way is decomposed by the arm member into a vertical downward component force that pushes the arm member downward and a horizontal component force that moves the arm member to the back side of the retaining wall. Therefore, moment and horizontal force can be efficiently and simultaneously applied to the head of the retaining wall.

このように、地山が軟弱で山留め壁に作用する側圧が大きい場合や山留め壁と敷地境界との間隔が狭隘である等、地盤条件及び敷地条件に制約がある場合にも、山留め壁の支保工に地盤アンカーを採用しつつ、効率よく山留め壁の掘削領域側への変形を抑止することが可能となる。   In this way, when the ground is soft and the side pressure acting on the retaining wall is large, or when the ground and site conditions are limited, such as when the distance between the retaining wall and the site boundary is narrow, the retaining wall is supported. While adopting a ground anchor for the work, it becomes possible to efficiently suppress the deformation of the retaining wall to the excavation area side.

本発明における山留め壁の支持構造の概略を示す図である。It is a figure which shows the outline of the support structure of the retaining wall in this invention. 第１の実施の形態の角度調整部材の設置状況を示す図である。It is a figure which shows the installation condition of the angle adjustment member of 1st Embodiment. 第１の実施の形態の角度調整部材の詳細を示す図である。It is a figure which shows the detail of the angle adjustment member of 1st Embodiment. 第２の実施の形態の角度調整部材の設置状況を示す図である。It is a figure which shows the installation condition of the angle adjustment member of 2nd Embodiment. 本発明における山留め壁の支持構造の他の事例を示す図である。It is a figure which shows the other example of the support structure of the retaining wall in this invention.

本発明の山留め壁の支持構造は、山留め壁の支保工として地盤アンカーを採用するにあたり、山留め壁の頭部近傍であって背面側にアーム部材を接合するとともに、該アーム部材各々を連結するように腹起しを架け渡し、角度調整部材を介して腹起しの上面が地盤アンカーと直交するよう調整したうえで、腹起しに地盤アンカーの頭部を定着するものである。   The supporting structure of the retaining wall according to the present invention employs a ground anchor as a supporting structure for the retaining wall so that the arm member is joined to the back side near the head of the retaining wall and the arm members are connected to each other. The head of the ground anchor is fixed to the erection after the upper surface of the erection is adjusted to be perpendicular to the ground anchor via the angle adjusting member.

以下に、本発明の山留め壁の支持構造および山留め壁の支持工法を、図１〜図５を用いて説明する。なお、本実施の形態では、地盤アンカーの打設角度を、鉛直に対する傾斜角度として表すこととした。   Below, the supporting structure of the retaining wall and the supporting method of the retaining wall according to the present invention will be described with reference to FIGS. In the present embodiment, the placement angle of the ground anchor is expressed as an inclination angle with respect to the vertical.

〈第１の実施の形態〉
図１で示すように、山留め壁１は、芯材となる複数の鉛直部材１１を備えたソイルセメント柱列壁よりなり、その背面側の地表面付近には地山がすき取られたすき取り空間３が形成されている。そして、このすき取り空間３に、鉛直部材１１各々の頭部近傍の背面側に片持ち状態で固定されたアーム部材４が、それぞれ水平に延在している。また、アーム部材４の上部には、図２で示すように長尺な鋼材よりなり、複数のアーム部材４を連結するように山留め壁１の延長方向に沿って延在する腹起し５が設置され、腹起し５の上面に地盤アンカー２の頭部が支圧板２１を介して定着されている。 <First Embodiment>
As shown in FIG. 1, the mountain retaining wall 1 is composed of a soil cement column wall provided with a plurality of vertical members 11 serving as a core material, and a scraped space in which a natural mountain is scraped near the ground surface on the back side. 3 is formed. And in this scraping space 3, the arm member 4 fixed in the cantilever state to the back side near the head of each vertical member 11 extends horizontally. Moreover, the upper part of the arm member 4 is made of a long steel material as shown in FIG. 2, and has a flank 5 extending along the extending direction of the retaining wall 1 so as to connect the plurality of arm members 4. It is installed, and the head of the ground anchor 2 is fixed to the upper surface of the erection 5 via the bearing plate 21.

地盤アンカー２は、図１で示すように、鉛直に対して約５〜１５度の傾斜角度αをもって、山留め壁１背面側の地山に打設されており、定着体２２は地山の良質地盤７に定着されている。このように打設された地盤アンカー２に緊張力を導入すると、地盤アンカー２の頭部から腹起し５を介してアーム部材４に作用される押圧力Ｆが、アーム部材４を下方向に押し下げる鉛直下方向の分力Ｆａと、アーム部材４を山留め壁１の背面側に移動させようとする水平方向の分力Ｆｂに分解される。   As shown in FIG. 1, the ground anchor 2 is placed in a natural ground on the back side of the retaining wall 1 at an inclination angle α of about 5 to 15 degrees with respect to the vertical, and the fixing body 22 is a good quality natural ground. Fixed to the ground 7. When tension is introduced into the ground anchor 2 thus placed, the pressing force F applied to the arm member 4 through the head 5 of the ground anchor 2 through the head 5 causes the arm member 4 to move downward. It is broken down into a component force Fa in the vertically downward direction to be pushed down and a component force Fb in the horizontal direction that attempts to move the arm member 4 to the back side of the retaining wall 1.

これにより、アーム部材４を介して山留め壁１の頭部に、モーメントと水平力を同時に作用させることができる。このため、地盤アンカー２を鉛直に打設する場合と比較して、山留め壁１の頭部における背面側への変位量を水平力を作用させた分だけ増大させることができ、山留め壁１が掘削領域８側へ変形もしくは転倒しようとする挙動の抑止効果を、より向上することができるものである。   Thereby, a moment and a horizontal force can be simultaneously applied to the head of the retaining wall 1 via the arm member 4. For this reason, compared with the case where the ground anchor 2 is driven vertically, the amount of displacement of the head of the retaining wall 1 toward the back side can be increased by the amount of applied horizontal force. It is possible to further improve the effect of suppressing the behavior of deformation or falling to the excavation region 8 side.

また、アーム部材４の上面に地盤アンカー２から押圧力を作用させることにより、地盤アンカー２からの押圧力を山留め壁１に直接作用させる一般的な地盤アンカー工法と比較して、地盤アンカー２の鉛直に対する傾斜角度を大幅に小さくすることができる。これにより、山留め壁１から地盤アンカー２の定着体２２までの水平距離が短くなるため、敷地境界と山留め壁１との間隔が狭隘な場合にも、地盤アンカー工法を採用することが可能となる。   In addition, by applying a pressing force from the ground anchor 2 to the upper surface of the arm member 4, compared to a general ground anchor construction method in which the pressing force from the ground anchor 2 directly acts on the retaining wall 1, The inclination angle with respect to the vertical can be greatly reduced. Thereby, since the horizontal distance from the retaining wall 1 to the fixing body 22 of the ground anchor 2 is shortened, the ground anchor method can be employed even when the distance between the site boundary and the retaining wall 1 is narrow. .

なお、山留め壁１は、鋼材よりなる鉛直部材１１を備える山留め壁であれば、親杭横矢板壁やソイルセメント溝壁等、いずれの方法にて構築されたものでもあってもよい。また、アーム部材４は、本実施の形態において、図２で示すようにＨ形鋼を採用しているが、上面に荷重を載荷された際に曲げ変形を生じにくい部材であれば、いずれを用いてもよい。   In addition, as long as the retaining wall 1 is a retaining wall provided with the vertical member 11 which consists of steel materials, it may be constructed | assembled by any methods, such as a parent pile horizontal sheet pile wall and a soil cement groove wall. In addition, in this embodiment, the arm member 4 employs an H-shaped steel as shown in FIG. 2, but any one can be used as long as it does not easily cause bending deformation when a load is loaded on the upper surface. It may be used.

さらに、腹起し５は、本実施の形態において、図２で示すように一対の溝形鋼を採用しているが、横臥状態においてその上面が、地盤アンカー２の頭部を定着させる際に用いる支圧板２１と面接触することのできる平面を備えていれば、いずれの長尺な鋼材を採用してもよい。また、地盤アンカー２は、本実施の形態において、一般に広く知られているアンボンドシースに被覆された緊張材を採用し、緊張材の先端部近傍をアンボンドシースから露出させて定着体２２を形成している。しかし、必ずしもこれに限定されるものではなく、一般に地盤アンカー工法にて採用されているアンカー部材であれば、地盤アンカー２にいずれを用いてもよい   Further, in the present embodiment, as shown in FIG. 2, the erection 5 employs a pair of grooved steels. However, when the upper surface fixes the head of the ground anchor 2 in the lying state, Any long steel material may be adopted as long as it has a plane that can come into surface contact with the bearing plate 21 to be used. Further, in the present embodiment, the ground anchor 2 employs a tension material covered with an unbonded sheath that is generally widely known, and the fixing member 22 is formed by exposing the vicinity of the tip of the tension material from the unbonded sheath. ing. However, it is not necessarily limited to this, and any anchor member that is generally employed in the ground anchor method may be used for the ground anchor 2.

ところで、本実施の形態では、図１で示すように、地盤アンカー２の頭部から腹起し５に作用される押圧力Ｆをスムーズにアーム部材４に伝達するべく、腹起し５の上面に地盤アンカー２と直交する面を形成するよう調整するための角度調整部材６を、アーム部材４の上面と腹起し５との間に設置している。   By the way, in this Embodiment, as shown in FIG. 1, in order to smoothly transmit the pressing force F applied to the erection 5 from the head of the ground anchor 2 to the arm member 4, the upper surface of the erection 5 An angle adjusting member 6 for adjusting so as to form a surface orthogonal to the ground anchor 2 is provided between the upper surface of the arm member 4 and the belly 5.

角度調整部材６は、図３（ａ）で示すような鋼板よりなり、上面６１が下面６２に対して傾斜した形状に成形されるとともに、上面６１には、腹起し５の下部を嵌合可能に切り欠かれ、かつ切欠き底部が上面６１と平行をなす凹部６３が形成されている。なお、角度調整部材６は、必ずしも板材に限定されるものではなく、上面６１が下面６２に対して傾斜した形状に形成される部材であれば、断面三角形の柱状体等いずれの部材を採用してもよい。また、本実施の形態では、角度調整部材６の下面６２に、図３（ｂ）で示すようなアーム部材４に設置するための取り付け板９を固定しているが、取り付け板９は必ずしも設けなくてもよい。   The angle adjusting member 6 is made of a steel plate as shown in FIG. 3A, and the upper surface 61 is formed in a shape inclined with respect to the lower surface 62, and the lower portion of the upset 5 is fitted to the upper surface 61. A recess 63 is formed that is cut out so that the bottom of the cutout is parallel to the upper surface 61. The angle adjusting member 6 is not necessarily limited to a plate material, and any member such as a columnar body having a triangular cross section may be adopted as long as the upper surface 61 is formed in a shape inclined with respect to the lower surface 62. May be. Further, in the present embodiment, the mounting plate 9 for installation on the arm member 4 as shown in FIG. 3B is fixed to the lower surface 62 of the angle adjusting member 6, but the mounting plate 9 is not necessarily provided. It does not have to be.

上述する構成の角度調整部材６は、図２で示すように、各々の上面６１に形成された凹部６３に腹起し５を横臥した状態で嵌合すると、腹起し５の上面は、角度調整部材３の上面６１と平行に保持される。つまり、角度調整部材６において、下面６２に対する上面６１の角度を調整することで、腹起し５に溝形鋼やチャンネル材等のいずれの既成部材を採用した場合にも、腹起し５の上面を角度調整部材６の下面６２に対する所望の角度に設定することができるものである。   As shown in FIG. 2, when the angle adjusting member 6 having the above-described configuration is fitted in the recessed portion 63 formed on each upper surface 61 in a state in which the flank 5 is lying on its side, the upper surface of the flank 5 is an angle. The adjustment member 3 is held in parallel with the upper surface 61. That is, by adjusting the angle of the upper surface 61 with respect to the lower surface 62 in the angle adjusting member 6, even if any pre-made member such as a grooved steel or a channel material is adopted for the bulge 5, The upper surface can be set to a desired angle with respect to the lower surface 62 of the angle adjusting member 6.

そこで、本実施の形態では、アーム部材４の上面が水平面をなしていることから、角度調整部材６を、下面６２に対する上面６１の角度が鉛直方向に対する地盤アンカー２の傾斜角度αとなるよう構成し、アーム部材４の上面に設置することで、腹起し５の上面を地盤アンカー２と直交するようにした。こうすると、図１で示すように、地盤アンカー２と溝形鋼よりなる腹起し５のウェブ５１が平行となり、また、地盤アンカー２の支圧板２１と溝形鋼よりなる腹起し５の上面をなすフランジ５２が平行となる。このため、地盤アンカー２に緊張力が付与されて腹起し５のフランジ５２からウェブ５２に押圧力Ｆが作用されても、腹起し５が水平方向にたわみ等の変形を生じることはない。   Therefore, in the present embodiment, since the upper surface of the arm member 4 forms a horizontal plane, the angle adjusting member 6 is configured such that the angle of the upper surface 61 with respect to the lower surface 62 is the inclination angle α of the ground anchor 2 with respect to the vertical direction. Then, by installing on the upper surface of the arm member 4, the upper surface of the erection 5 was orthogonal to the ground anchor 2. In this way, as shown in FIG. 1, the ground anchor 2 and the web 51 of the flank 5 made of channel steel are parallel to each other, and the bearing plate 21 of the ground anchor 2 and the flank 5 made of channel steel are The flange 52 which makes the upper surface becomes parallel. For this reason, even if the tension force is applied to the ground anchor 2 and the pressing force F is applied to the web 52 from the flange 52 of the erection 5, the erection 5 does not undergo deformation such as deflection in the horizontal direction. .

また、角度調整部材６の上面に凹部６３を形成し、この凹部６３に腹起し５を嵌合させるため、アーム部材４に対して腹起し５を容易に位置決めすることが可能となる。   Further, since the concave portion 63 is formed on the upper surface of the angle adjusting member 6 and the bulge 5 is fitted into the concave portion 63, the bulge 5 can be easily positioned with respect to the arm member 4.

このような構成の山留め壁の支持構造を用いた支持工法は、山留め壁１の背面近傍にすき取り空間３を形成し、山留め壁１を構成する鉛直部材１１にアーム部材４を接合するとともに、アーム部材４上に固定治具１１を介して角度調整部材６を設置する。一方で、山留め壁１の背面側の地山に、鉛直に対して約５〜１５度の傾斜角度αをもって地盤アンカー２を打設しておき、角度調整部材６の上面６１に形成した凹部６３に腹起し５を嵌合したうえで、腹起し５の上面に支圧板２１を介して地盤アンカー２の頭部を定着させ、地盤アンカー２に緊張力を導入する。こうして、山留め壁１の頭部にモーメントおよび水平力を作用させる。   The support method using the support structure of the retaining wall having such a structure forms a scraping space 3 in the vicinity of the back surface of the retaining wall 1, joins the arm member 4 to the vertical member 11 constituting the retaining wall 1, and An angle adjusting member 6 is installed on the arm member 4 via a fixing jig 11. On the other hand, the ground anchor 2 is driven on the ground on the back side of the mountain retaining wall 1 with an inclination angle α of about 5 to 15 degrees with respect to the vertical, and a recess 63 formed on the upper surface 61 of the angle adjusting member 6. The head 5 of the ground anchor 2 is fixed to the upper surface of the belly erection 5 via the bearing plate 21, and tension is introduced into the ground anchor 2. In this way, a moment and a horizontal force are applied to the head of the retaining wall 1.

ここで、山留め壁１の支持構造は、地盤アンカー２、アーム部材４、腹起し５および角度調整部材６の全てが山留め壁１の背面側に配置されているため、掘削領域８に地下構造物を構築するべく掘削作業を実施するにあたり、山留め壁１が自立できる深さまで掘削する１次掘削を待たずに、山留め壁１の支持構造を用いた支持工法を実施することができる。   Here, the support structure of the retaining wall 1 is that the ground anchor 2, the arm member 4, the erection 5 and the angle adjusting member 6 are all arranged on the back side of the retaining wall 1, so In carrying out excavation work for constructing an object, a support method using the support structure of the retaining wall 1 can be implemented without waiting for the primary excavation for excavating to a depth at which the retaining wall 1 can stand on its own.

つまり、山留め壁１を構築した後、掘削領域８の１次掘削作業と、地盤アンカー２に緊張力を導入するまでの一連の作業とを、並行して行うことが可能となる。なお、地盤アンカー２への緊張力の導入作業は、１次掘削終了後に行ってもよい。   That is, after the mountain retaining wall 1 is constructed, the primary excavation work of the excavation area 8 and the series of work until the tension force is introduced to the ground anchor 2 can be performed in parallel. In addition, you may perform the introduction | transduction operation | work of the tension | tensile_strength to the ground anchor 2 after completion | finish of primary excavation.

これにより、山留め壁に頭部を定着する地盤アンカーや切梁等の従来の支保工にて山留め壁を支持する方法のように、山留め壁１が自立できる深さまでの掘削領域８の１次掘削を行い、支保工の設置作業を行った後、掘削領域８の２次掘削を行う、といった掘削作業を複数工程に分ける必要がないため、掘削作業に係る作業工程を短縮することが可能となる。   As a result, the primary excavation of the excavation region 8 to the depth at which the retaining wall 1 can stand on its own, as in the method of supporting the retaining wall with a conventional anchoring work such as a ground anchor or a beam that fixes the head to the retaining wall It is not necessary to divide the excavation work into a plurality of processes after performing the excavation work and performing the secondary excavation of the excavation area 8, so that the work process related to the excavation work can be shortened. .

また、山留め壁１の支持構造は、従来より支保工に採用されている切梁のように、掘削用機械の障害となることがないため、掘削領域８の掘削作業性を大幅に向上することも可能となる。   Moreover, since the support structure of the retaining wall 1 does not become an obstacle to the excavating machine unlike the beam conventionally used for the support work, the excavation workability in the excavation region 8 is greatly improved. Is also possible.

なお、本実施の形態では、角度調整部材６の下面６２に取り付け板９を設置し、固定治具１１に万力を用いて角度調整部材６をアーム部材４上に設置したが、必ずしもこれに限定されるものではない。角度調整部材６をアーム部材４上に設置できる固定治具１１であればいずれを採用してもよく、また、取り付け板９を用いることなく、角度調整部材６を溶接等の固着手段にて直接アーム部材４上に設置してもよい。   In the present embodiment, the mounting plate 9 is installed on the lower surface 62 of the angle adjusting member 6 and the angle adjusting member 6 is installed on the arm member 4 using a vise for the fixing jig 11. It is not limited. Any fixing jig 11 that can install the angle adjusting member 6 on the arm member 4 may be adopted, and the angle adjusting member 6 may be directly attached by fixing means such as welding without using the attachment plate 9. It may be installed on the arm member 4.

〈第２の実施の形態〉
次に、山留め壁１の支持構造における他の事例を、図４を参照しつつ、以下に示す。なお、山留め壁１、地盤アンカー２およびアーム部材４は、第１の実施の形態と同様の部材を採用している。 <Second Embodiment>
Next, another example of the support structure of the retaining wall 1 will be described below with reference to FIG. In addition, the retaining wall 1, the ground anchor 2, and the arm member 4 employ | adopt the member similar to 1st Embodiment.

図４で示すように、角度調整部材１２は、鉛直部材１１とアーム部材４との間に設置される取り合い部材であり、かつ鉛直部材１１に対するアーム部材４の取り付け角度を調整し、アーム部材４の上面が地盤アンカー２と直交する面をなすように調整するものである。これにより、角度調整部材１２にて上面を地盤アンカー２と直交する面をなすように調整されたアーム部材４上に、腹起し５を設置することで、腹起し５の上面に地盤アンカー２と直交する面を形成することができるものである。   As shown in FIG. 4, the angle adjusting member 12 is a connecting member installed between the vertical member 11 and the arm member 4, and adjusts the mounting angle of the arm member 4 with respect to the vertical member 11, so that the arm member 4 It adjusts so that the upper surface of may form a surface orthogonal to the ground anchor 2. Thus, the ground anchor 5 is installed on the arm member 4 whose upper surface is adjusted by the angle adjusting member 12 so as to form a surface orthogonal to the ground anchor 2, so that the ground anchor The surface orthogonal to 2 can be formed.

本実施の形態では、アーム部材４が上面と直交する側端面を有していることから、角度調整部材１２におけるアーム部材４と接合する側端面１２１を、鉛直部材１１と接合する側端面１２２に対して地盤アンカー２の傾斜角度αだけ傾斜させる形状に成形した。なお、角度調整部材１２の形状はこれに限定されるものではなく、アーム部材４における上面の鉛直に対する傾斜角度を、自在に調整できる構成を有していれば、その形状はいずれに成形されてもよい。   In the present embodiment, since the arm member 4 has a side end surface orthogonal to the upper surface, the side end surface 121 joined to the arm member 4 in the angle adjusting member 12 is changed to the side end surface 122 joined to the vertical member 11. On the other hand, it was formed into a shape that is inclined by the inclination angle α of the ground anchor 2. Note that the shape of the angle adjusting member 12 is not limited to this, and the shape of the angle adjusting member 12 may be any shape as long as the angle of the upper surface of the arm member 4 can be adjusted freely. Also good.

上述する構成の山留め壁１の支持構造を用いた支持工法は、山留め壁１の背面にすき取り空間３を形成し、山留め壁１を構成する鉛直部材１１に角度調整部材１２を介してアーム部材４を溶接やボルト等の接合手段にて接合する。一方で、山留め壁１の背面側の地山に、鉛直に対して約５〜１５度の傾斜角度αをもって地盤アンカー２を打設しておき、アーム部材４の上面に腹起し５を設置したうえで、腹起し５の上面に支圧板２１を介して地盤アンカー２の頭部を定着させ、地盤アンカー２に緊張力を導入する。こうして、山留め壁１の頭部にモーメントおよび水平力を作用させる。   In the support method using the support structure of the retaining wall 1 having the above-described structure, the scraping space 3 is formed on the back surface of the retaining wall 1, and the arm member is disposed on the vertical member 11 constituting the retaining wall 1 via the angle adjusting member 12. 4 is joined by joining means such as welding or bolts. On the other hand, a ground anchor 2 is placed on a ground mountain on the back side of the mountain retaining wall 1 with an inclination angle α of about 5 to 15 degrees with respect to the vertical, and an erection 5 is installed on the upper surface of the arm member 4. After that, the head of the ground anchor 2 is fixed on the upper surface of the abdomen 5 via the bearing plate 21, and tension is introduced into the ground anchor 2. In this way, a moment and a horizontal force are applied to the head of the retaining wall 1.

なお、本発明における山留め壁１の支持構造および支持工法は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能である。   In addition, the support structure and support method of the retaining wall 1 in this invention are not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.

例えば、本実施の形態では、地盤アンカー２の定着体２２を地盤中の良質地盤７に定着させたが、必ずしもこれに限定されるものではなく、図５で示すように、山留め壁１の背面側であって敷地境界内に地盤改良体１３を構築し、地盤改良体１２に定着体２２を定着させてもよい。こうすると、良質地盤７の深さに制約されることなく、地盤アンカー２における自由長の長さを適切に設定し、定着体２２を確実に定着させることが可能となる。   For example, in the present embodiment, the fixing body 22 of the ground anchor 2 is fixed to the high-quality ground 7 in the ground. However, the present invention is not necessarily limited to this, and as shown in FIG. Alternatively, the ground improvement body 13 may be constructed within the boundary of the site and the fixing body 22 may be fixed to the ground improvement body 12. In this way, the length of the free length in the ground anchor 2 can be set appropriately without being restricted by the depth of the high-quality ground 7, and the fixing body 22 can be reliably fixed.

また、本実施の形態では、図１で示すように、山留め壁１の背面側の地表面付近に地山をすき取ったすき取り空間３を形成し、このすき取り空間３に、鉛直部材１１各々の頭部近傍の背面側に固定したアーム部材４を延在させている。しかし、必ずしもこれに限定されるものではなく、例えば、山留め壁１を構築する際に、鉛直部材１１の頭部を地表面より上方に突出させておき、この地表面より上方に位置する鉛直部材１１の頭部近傍の背面側にアーム部材４を設置してもよい。   Further, in the present embodiment, as shown in FIG. 1, a scraping space 3 is formed in the vicinity of the ground surface on the back side of the mountain retaining wall 1, and a vertical member 11 is provided in the scraping space 3. The arm member 4 fixed to the back side in the vicinity of the head is extended. However, the present invention is not necessarily limited thereto. For example, when the mountain retaining wall 1 is constructed, the head of the vertical member 11 is protruded above the ground surface, and the vertical member positioned above the ground surface. You may install the arm member 4 in the back side of 11 head vicinity.

１ 山留め壁
１１ 鉛直部材
２ 地盤アンカー
２１ 頭部
２２ 定着体
２３ 支圧板
３ すき取り部
４ アーム部材
５ 腹起し
５１ ウェブ
５２ フランジ
６ 角度調整部材
６１ 上面
６２ 下面
６３ 凹部
７ 良質地盤
８ 掘削領域
９ 取り付け板
１０ 固定治具
１１ 鉛直部座
１２ 角度調整部材
１２１ アームと接合する側端面
１２２ 鉛直部材と接合する側端面
１３ 地盤改良部 DESCRIPTION OF SYMBOLS 1 Mountain retaining wall 11 Vertical member 2 Ground anchor 21 Head 22 Fixing body 23 Bearing plate 3 Scraping part 4 Arm member 5 Raising 51 Web 52 Flange 6 Angle adjustment member 61 Upper surface 62 Lower surface 63 Recessed part 7 Good quality ground 8 Excavation area 9 Mounting plate 10 Fixing jig 11 Vertical part seat 12 Angle adjusting member 121 Side end face 122 joined to arm Side end face 13 joined to vertical member Ground improvement part

Claims (3)

山留め壁を構成する複数の鉛直部材各々の頭部であって背面側に接合されるアーム部材、複数の該アーム部材各々に架け渡される腹起し、および該腹起しに頭部を定着され、鉛直に対して傾斜角度を有する複数の地盤アンカーよりなる、山留め壁の支持構造であって、
前記アーム部材上に、前記腹起しの上面を前記地盤アンカーと直交する面となるよう調整する角度調整部材が設置されており、該角度調整部材の上面に、前記腹起しが設置されることを特徴とする山留め壁の支持構造。 The head of each of the plurality of vertical members constituting the retaining wall, the arm member joined to the back side, the erection erected over each of the plurality of arm members, and the head erected to the erection A support structure for a mountain retaining wall comprising a plurality of ground anchors having an inclination angle with respect to the vertical,
An angle adjustment member is installed on the arm member so as to adjust the upper surface of the erection surface to be a surface orthogonal to the ground anchor, and the erection member is installed on the upper surface of the angle adjustment member. The support structure of the retaining wall characterized by this. 請求項１に記載の山留め壁の支持構造において、
前記山留め壁の背面側に地盤改良体が構築され、
該地盤改良体に、前記地盤アンカーの定着体が定着されることを特徴とする山留め壁の支持構造。 In the support structure of the retaining wall of Claim 1,
A ground improvement body is constructed on the back side of the mountain retaining wall,
A support structure for a retaining wall, wherein a fixing body of the ground anchor is fixed to the ground improvement body. 山留め壁を構成する複数の鉛直部材各々の頭部であって背面側にアーム部材を接合するとともに、該アーム部材上に腹起しを設置した後、複数の地盤アンカーを、鉛直に対して傾斜角度を有するように地山に打設し、頭部を前記腹起しに定着して、地盤アンカーに緊張力を導入する山留め壁の支持方法であって、
前記アーム部材上に、前記腹起しの上面を前記地盤アンカーと直交する面となるよう調整する角度調整部材を設置し、該角度調整部材の上面に、前記腹起しを設置することを特徴とする山留め壁の支持方法。 At the head of each of the plurality of vertical members constituting the retaining wall, the arm member is joined to the back side, and after placing the erection on the arm member, the plurality of ground anchors are inclined with respect to the vertical. It is a method for supporting a retaining wall that is placed in a natural ground so as to have an angle, the head is fixed to the flank, and tension is introduced into the ground anchor,
An angle adjustment member is installed on the arm member to adjust the upper surface of the erection to be a surface orthogonal to the ground anchor, and the erection is installed on the upper surface of the angle adjustment member. How to support the retaining wall.
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