JP2012241478A - Method for extending earth retaining wall and earth retaining wall structure - Google Patents

Method for extending earth retaining wall and earth retaining wall structure Download PDF

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JP2012241478A
JP2012241478A JP2011115252A JP2011115252A JP2012241478A JP 2012241478 A JP2012241478 A JP 2012241478A JP 2011115252 A JP2011115252 A JP 2011115252A JP 2011115252 A JP2011115252 A JP 2011115252A JP 2012241478 A JP2012241478 A JP 2012241478A
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retaining wall
steel material
vertical hole
earth retaining
existing
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JP5512600B2 (en
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Zenichi Ishii
善一 石井
Kenichi Miyashita
健一 宮下
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Taisei Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for extending an underground floor and a structure for reinforcing an earth retaining wall which can extend an underground floor below an existing building without demolishing an existing earth retaining wall, in a limited site.SOLUTION: A method for extending an earth retaining wall comprises a step of boring a vertical hole 21 penetrating an existing earth retaining wall 10, a step of inserting a steel material 22 into the vertical hole 21 and making the bottom edge of the steel material 22 project downwards from the earth retaining wall 10, and a step of packing a filler in the space between the inner wall surface of the vertical hole 21 and the steel material 22. An earth retaining wall structure 1 established by the method is also provided.

Description

本発明は、土留壁の増築方法および土留壁構造に関する。   The present invention relates to a method for extending a retaining wall and a retaining wall structure.

既設建物の下方を掘り下げて、地下階を増築することで、建物の床面積を増加させ、土地の有効利用を図る場合がある。   By digging down the existing building and expanding the basement floor, the floor area of the building may be increased to make effective use of the land.

従来、地下階を増築する場合には、土留壁や建物躯体等の既設の構造物を解体した後、新たに土留壁を構築してから、地盤を掘り下げるのが一般的であった。   Conventionally, when extending an underground floor, it is common to dig up the ground after constructing a new retaining wall after dismantling existing structures such as the retaining wall and building frame.

ところが、既設の構造物（土留壁や建物）を全て解体すると、施工に手間がかかるとともに、多量の廃棄物が発生するという問題が生じていた。   However, when all the existing structures (such as retaining walls and buildings) are dismantled, the construction takes time and a lot of waste is generated.

そのため、特許文献１には、既設の地下外壁に所定の間隔により複数の注入孔を形成し、この注入孔を利用して噴射撹拌等により円柱状の地盤改良体を形成することで、既設の地下外壁の下方に土留壁を形成した後、この土留壁により囲まれた空間に、地下階を増築する方法が開示されている。   Therefore, in Patent Document 1, a plurality of injection holes are formed at a predetermined interval in an existing underground outer wall, and a cylindrical ground improvement body is formed by injection stirring or the like using the injection holes. A method of expanding a basement floor in a space surrounded by the retaining wall after forming a retaining wall below the underground outer wall is disclosed.

特開２００２−１１５２６０号公報JP 2002-115260 A

特許文献１の地下階増築方法は、地下外壁に形成された注入孔を中心とした円柱状の地盤改良体により土留壁を形成するため、新設の地下部分の床面積が、既設の地下部分の床面積よりも狭く形成されてしまう。
また、土留壁が既設の地下外壁よりも外側に張り出すため、建物が密集した地域では、施工できない場合があった。 In the method of extending the underground floor of Patent Document 1, the retaining wall is formed by a cylindrical ground improvement body centered on the injection hole formed in the underground outer wall, so that the floor area of the newly installed underground portion is It will be formed narrower than the floor area.
In addition, because the retaining wall protrudes outside the existing underground outer wall, construction may not be possible in areas where buildings are densely packed.

なお、地盤改良体により構成された土留壁は、既設の構造物とは独立した構造であり、土圧や水圧等に対して十分な強度を発現させるためには、地下外壁よりも大きな断面に形成する必要がある。   In addition, the retaining wall composed of the ground improvement body is a structure independent of the existing structure, and in order to develop sufficient strength against earth pressure and water pressure, it has a larger cross section than the underground outer wall. Need to form.

本発明は、前記の問題点を解決するものであり、既設の土留壁を解体することなく、かつ、断面形状を増加させることなく簡易に既設の土留壁の深さを増すことを可能とした土留壁の増築方法および土留壁構造を提案することを課題とする。   The present invention solves the above-described problems, and allows the depth of the existing retaining wall to be easily increased without disassembling the existing retaining wall and without increasing the cross-sectional shape. The purpose is to propose a method for extending the retaining wall and a retaining wall structure.

前記課題を解決するために、本発明の土留壁の増築方法は、既設の土留壁を貫通する縦孔を削孔する工程と、前記縦孔に鋼材を挿入し、前記鋼材の下端を前記土留壁の下方に突出させる工程と、前記縦孔の内壁面と前記鋼材との隙間に充填材を充填する工程とを備えることを特徴としている。   In order to solve the above problems, a method for extending a retaining wall according to the present invention includes a step of drilling a vertical hole penetrating an existing retaining wall, a steel material is inserted into the vertical hole, and a lower end of the steel material is connected to the retaining wall. The method includes a step of projecting downward from the wall, and a step of filling a filler in a gap between the inner wall surface of the vertical hole and the steel material.

かかる土留壁の増築方法によれば、既設の土留壁を利用して新設の土留部分を形成することができるので、既設の土留壁を解体することなく地下階を増築することができ、施工性に優れている。
また、新設の土留部分が既設の土留壁の外側に張り出すこともないため、用地を最大限に利用した施工が可能である。 According to this method of extending the retaining wall, it is possible to form a new retaining wall part using the existing retaining wall, so that the underground floor can be expanded without dismantling the existing retaining wall. Is excellent.
In addition, since the new earth retaining part does not protrude to the outside of the existing earth retaining wall, construction using the site to the maximum is possible.

前記縦孔を、前記土留壁の芯材のフランジ間に形成すれば、既設の土留壁と、新設の土留部分との一体性が増す。   If the vertical hole is formed between the flanges of the core of the retaining wall, the integrity of the existing retaining wall and the newly installed retaining part is increased.

前記鋼材が筒状部材からなる場合には、前記鋼材の内部にも充填材を充填することで、新設の土留部分の増強を図ることができる。   When the steel material is a cylindrical member, it is possible to reinforce the newly installed earth retaining portion by filling the steel material with a filler.

また、本発明の土留壁構造は、既設の土留壁を貫通するように形成された縦孔と、前記縦孔内に配設された鋼材と、前記縦孔の内壁面と前記鋼材との隙間に充填された充填材とを備え、前記鋼材の下端が前記土留壁の下方に突出していることを特徴としている。   Further, the retaining wall structure of the present invention includes a vertical hole formed so as to penetrate an existing retaining wall, a steel material disposed in the vertical hole, and a gap between the inner wall surface of the vertical hole and the steel material. And a lower end of the steel material protrudes downward from the earth retaining wall.

かかる土留壁構造によれば、簡易に既設の土留壁の下方に新設の土留部分を延長させることが可能となる。   According to such a retaining wall structure, it is possible to easily extend the newly installed retaining portion below the existing retaining wall.

本発明の土留壁の増築方法および土留壁構造によれば、既設の土留壁を解体することなく、かつ、断面形状を増加させることなく簡易に既設の土留壁の深さを増すことが可能なる。   According to the retaining wall extension method and retaining wall structure of the present invention, it is possible to easily increase the depth of an existing retaining wall without dismantling the existing retaining wall and without increasing the cross-sectional shape. .

本発明の実施の形態に係る土留壁構造を模式的に示す断面図である。It is sectional drawing which shows typically the earth retaining wall structure which concerns on embodiment of this invention. （ａ）は図１に示す土留壁構造の平面図、（ｂ）は同拡大平面図である。(A) is a top view of the retaining wall structure shown in FIG. 1, (b) is the same enlarged plan view. 本実施形態の土留壁の増築方法の各工程を示す断面図であって、（ａ）は施工前状況、（ｂ）は削孔工程、（ｃ）は鋼材挿入工程、（ｄ）は充填工程である。It is sectional drawing which shows each process of the extension method of the retaining wall of this embodiment, (a) is the condition before construction, (b) is a drilling process, (c) is a steel material insertion process, (d) is a filling process. It is. モデル化した土留壁構造の応力図である。It is a stress figure of the modeled retaining wall structure. (ａ)および（ｂ）は土留壁構造の他の形態を示す図である。(a) And (b) is a figure which shows the other form of a retaining wall structure.

以下、本発明の実施の形態について説明する。
本実施形態では、既設建物Ｂの下方に新設の地下階（以下、単に「新設部分Ｂａ」という）を増築する場合を例示する。 Embodiments of the present invention will be described below.
In the present embodiment, a case in which a newly installed basement (hereinafter simply referred to as “new part Ba”) is extended below the existing building B is illustrated.

本実施形態に係る土留壁の増築方法は、既設の土留壁１０の下方に新設の土留部分２０を増築する方法であり、既設の土留壁１０の深さが、新設部分Ｂａの掘削のために必要な深さを備えていない場合（床付け面Ｔより浅い場合や、床付け面Ｔよりも深いが根入れを確保できない場合等）に適用される。   The extension method of the retaining wall according to the present embodiment is a method of extending the newly installed retaining part 20 below the existing retaining wall 10, and the depth of the existing retaining wall 10 is used for excavation of the new part Ba. This is applied when the required depth is not provided (when the depth is lower than the flooring surface T, or when the depth is deeper than the flooring surface T but cannot be secured).

土留壁の増築方法により形成される土留壁構造１は、図１に示すように、既設の土留壁１０を貫通するように形成された縦孔２１と、この縦孔２１内に配設された鋼材２２と、縦孔２１の内壁面と鋼材２２との隙間に充填された充填材２３とを備えて構成されている。   As shown in FIG. 1, the retaining wall structure 1 formed by the method of extending the retaining wall is provided with a vertical hole 21 formed so as to penetrate the existing retaining wall 10 and the vertical hole 21. A steel material 22 and a filler 23 filled in a gap between the inner wall surface of the vertical hole 21 and the steel material 22 are provided.

既設の土留壁１０は、図２の（ａ）に示すように、所定の間隔により地中に配設された複数の親杭（芯材）１１，１１，…と、隣り合う親杭１１同士の間に横架された矢板１２とにより形成された、いわゆる親杭横矢板工法により形成されたものである。   As shown in FIG. 2A, the existing earth retaining wall 10 includes a plurality of parent piles (core members) 11, 11,... It is formed by the so-called parent pile horizontal sheet pile construction method formed by the sheet pile 12 laid between the two.

親杭１１は、図２の（ｂ）に示すように、地中に配設されたＨ形鋼により構成されている。本実施形態の親杭１１の周囲には、グラウト１３が注入されている。
なお、親杭１１を構成する部材はＨ形鋼に限定されるものではない。また、土留壁１０は、必ずしも親杭１１の周囲にグラウト１３が注入されていなくてもよい。 As shown in FIG. 2 (b), the parent pile 11 is made of H-shaped steel disposed in the ground. A grout 13 is injected around the parent pile 11 of the present embodiment.
In addition, the member which comprises the parent pile 11 is not limited to H-section steel. In addition, the retaining wall 10 does not necessarily have to be filled with the grout 13 around the parent pile 11.

縦孔１１は、図１に示すように、既設の土留壁１０を貫通して、底面２１ａが土留壁１０の下端１０ａよりも低い位置となるように形成されている。   As shown in FIG. 1, the vertical hole 11 penetrates the existing retaining wall 10 and is formed so that the bottom surface 21 a is positioned lower than the lower end 10 a of the retaining wall 10.

本実施形態では、図２の（ｂ）に示すように、一つの親杭１１に対して、一対の縦孔２１，２１を形成する。両縦孔２１，２１は、ウェブ１１ａを挟んで対向するように形成されている。
各縦孔２１は、Ｈ形鋼からなる親杭１１のフランジ１１ｂ，１１ｂとウェブ１１ａにより囲まれたコ字状の領域内に形成されている。 In this embodiment, as shown in FIG. 2B, a pair of vertical holes 21 and 21 are formed for one parent pile 11. Both vertical holes 21 and 21 are formed to face each other with the web 11a interposed therebetween.
Each vertical hole 21 is formed in a U-shaped region surrounded by the flanges 11b and 11b of the main pile 11 made of H-shaped steel and the web 11a.

本実施形態の縦孔２１は、断面円形に形成されていて、鋼材２２を挿入することが可能な内径を有している。なお、縦孔２１の形状は限定されるものではなく、例えば角柱状に形成されていてもよい。   The vertical hole 21 of the present embodiment is formed in a circular cross section and has an inner diameter into which the steel material 22 can be inserted. In addition, the shape of the vertical hole 21 is not limited, For example, you may form in the shape of a prism.

鋼材２２は、図１に示すように縦孔２１に挿入されている。縦孔２１の下端は、既設の土留壁１０の下端１０ａから下方に突出している。
鋼材２２により土留壁１０の根入れ長が増加するため、土留壁構造１を利用すれば、既設建物Ｂの底面より深い位置まで掘削することが可能となる。 The steel material 22 is inserted into the vertical hole 21 as shown in FIG. The lower end of the vertical hole 21 protrudes downward from the lower end 10a of the existing retaining wall 10.
Since the penetration length of the retaining wall 10 is increased by the steel material 22, it is possible to excavate to a position deeper than the bottom surface of the existing building B by using the retaining wall structure 1.

本実施形態では、鋼材２２として、角筒状の部材を使用する。なお、鋼材２２を構成する材料は限定されるものではなく、例えば円筒状の部材であってもよいし、各種断面の形鋼材であってもよい。   In the present embodiment, a square tube-shaped member is used as the steel material 22. In addition, the material which comprises the steel material 22 is not limited, For example, a cylindrical member may be sufficient and the shape steel material of various cross sections may be sufficient.

充填材２３は、図２の（ｂ）に示すように、鋼材２２が挿入された縦孔２１の内部に充填されている。本実施形態では、縦孔２１の内壁面と鋼材２２のとの隙間および鋼材２２の内部に充填材２３が充填されている。   As shown in FIG. 2B, the filler 23 is filled in the vertical hole 21 into which the steel material 22 is inserted. In the present embodiment, the filler 23 is filled in the gap between the inner wall surface of the vertical hole 21 and the steel material 22 and in the steel material 22.

充填材２３は、所定の流動性を有し、縦孔２１内に密実に充填することが可能で、硬化することで所定の強度を発現する材料であれば限定されるものではないが、本実施形態ではセメント系のグラウトが使用されている。   The filler 23 is not limited as long as it is a material that has a predetermined fluidity, can be densely filled in the vertical holes 21, and exhibits a predetermined strength by curing. In the embodiment, cement-based grout is used.

本実施形態の土留壁の増築方法は、削孔工程と、鋼材挿入工程と、充填工程とを備えている。   The method for extending a retaining wall according to the present embodiment includes a drilling step, a steel material insertion step, and a filling step.

削孔工程は、図３の（ａ）に示す既設の土留壁１０に対して、土留壁１０を貫通する縦孔２１を削孔する工程である。なお、土留壁１０の下端は、新設部分Ｂａを構築する際の床付け面Ｔよりも浅い位置にある。   The drilling step is a step of drilling the vertical hole 21 penetrating the retaining wall 10 with respect to the existing retaining wall 10 shown in FIG. In addition, the lower end of the retaining wall 10 is in a position shallower than the flooring surface T when the new part Ba is constructed.

縦孔２１は、所望の根入れ深さを確保できるように、底面２１ａが土留壁１０の下端１０ａよりも十分に深い位置となるように削孔する（図３の（ｂ）参照）。つまり、縦孔２１は、予定された床付面Ｔに対して、土留壁構造１が十分な根入れ深さを確保できるように形成されている。
なお、縦孔２１の削孔工法は限定されるものではない。 The vertical hole 21 is drilled so that the bottom surface 21a is sufficiently deeper than the lower end 10a of the retaining wall 10 (see FIG. 3B) so as to ensure a desired depth of penetration. That is, the vertical hole 21 is formed so that the earth retaining wall structure 1 can secure a sufficient depth of penetration with respect to the planned floored surface T.
In addition, the drilling method of the vertical hole 21 is not limited.

鋼材挿入工程は、図３の（ｃ）に示すように、削孔工程において形成された縦孔２１に鋼材２２を挿入する工程である。   The steel material insertion step is a step of inserting the steel material 22 into the vertical hole 21 formed in the drilling step, as shown in FIG.

鋼材２２を縦孔２１に挿入すると、鋼材２２の下端が土留壁１０の下端１０ａから下方に突出する（図３の（ｄ）参照）。   When the steel material 22 is inserted into the vertical hole 21, the lower end of the steel material 22 protrudes downward from the lower end 10a of the earth retaining wall 10 (see FIG. 3D).

鋼材２２は、複数の鋼製部材を縦方向に連結しながら縦孔２１に挿入してもよいし、所定の長さを有した１本の鋼材２２を挿入してもよい。   The steel material 22 may be inserted into the vertical hole 21 while connecting a plurality of steel members in the vertical direction, or a single steel material 22 having a predetermined length may be inserted.

充填工程は、鋼材２２が挿入された縦孔２１内に充填材２３を充填する工程である。
本実施形態では、縦孔２１の内壁面と鋼材２２との隙間に充填材２３を充填するとともに、筒状の鋼材２２の内部にも充填材２３を充填する（図３の（ｄ）参照）。 The filling step is a step of filling the filler 23 into the vertical hole 21 in which the steel material 22 is inserted.
In the present embodiment, the filler 23 is filled in the gap between the inner wall surface of the vertical hole 21 and the steel material 22, and the filler 23 is also filled in the cylindrical steel material 22 (see FIG. 3D). .

なお、充填材２３の縦孔２１内への充填（充填工程）は、鋼材挿入工程の前に実施してもよい。つまり、充填材２３が注入された縦孔２１内に、鋼材２２を挿入することで、縦孔２１内を鋼材２２と充填材２３とにより充填してもよい。   In addition, you may implement the filling (filling process) in the vertical hole 21 of the filler 23 before a steel material insertion process. That is, the inside of the vertical hole 21 may be filled with the steel material 22 and the filler 23 by inserting the steel material 22 into the vertical hole 21 into which the filler 23 has been injected.

本実施形態の土留壁の増築方法および土留壁構造１によれば、既設の土留壁１０が下方に延長されるので、建物Ｂの下方に新設部分Ｂａを増築することが可能となり、用地をより有効に活用することが可能となる。   According to the retaining wall extension method and retaining wall structure 1 of the present embodiment, the existing retaining wall 10 is extended downward, so that it is possible to extend the newly installed portion Ba below the building B, and to make the site more It can be used effectively.

ここで、参考として、地表面からの深さが５．５ｍの土留壁を、本実施形態の土留壁構造１により８．０ｍの深さまで延長し、床付け面が５．７ｍとなるように掘削した場合に想定される変位の計算結果を図４に示す。なお、当該モデルでは、地表面から１．５ｍの位置に切梁を設置した場合について計算をしている。モーメント図およびせん断力図に示すように、土留壁構造１によれば、既設の土留壁１０と新設の土留部分２０とが一体となって、土圧に抵抗することがわかる。   Here, as a reference, the retaining wall having a depth of 5.5 m from the ground surface is extended to a depth of 8.0 m by the retaining wall structure 1 of the present embodiment so that the flooring surface becomes 5.7 m. The calculation result of the displacement assumed when excavating is shown in FIG. In this model, the calculation is performed for a case where a cut beam is installed at a position 1.5 m from the ground surface. As shown in the moment diagram and the shear force diagram, according to the retaining wall structure 1, it can be seen that the existing retaining wall 10 and the new retaining portion 20 are integrated to resist earth pressure.

また、既設の土留壁１０をそのまま利用し、既設の土留壁１０を解体することなく地下階（新設部分Ｂａ）を増築することができるため、施工性に優れているとともに経済的である。   Further, since the existing retaining wall 10 can be used as it is and the underground floor (new part Ba) can be expanded without dismantling the existing retaining wall 10, it is excellent in construction work and economical.

また、新設の土留部分２０が既設の土留壁１０よりも外側に張り出すことがないため、用地を最大限に利用して新設部分Ｂａを構築することができるとともに、用地境界に近接している場所での施工も可能である。   In addition, since the new earth retaining part 20 does not protrude outward from the existing earth retaining wall 10, the new part Ba can be constructed using the land to the fullest extent and is close to the land boundary. Construction on site is also possible.

また、縦孔２１を土留壁１０の親杭１１のフランジ１１ｂ，１１ｂ間に形成し、鋼材２２が土留壁１０を貫通しているため、既設の土留壁１０と新設の土留部分２０との一体性が増す。また、縦孔２１の削孔時に、既設の建物Ｂに傷を付けることもない。   Moreover, since the vertical hole 21 is formed between the flanges 11b and 11b of the main pile 11 of the retaining wall 10 and the steel material 22 penetrates the retaining wall 10, the existing retaining wall 10 and the newly installed retaining part 20 are integrated. Increases nature. Moreover, the existing building B is not damaged when the vertical hole 21 is drilled.

さらに、鋼材２２の内部に充填材２３を充填されているため、新設の土留部分２０の強度が高いものとなる。   Furthermore, since the filling material 23 is filled in the steel material 22, the strength of the newly installed earth retaining part 20 becomes high.

以上、本発明について、好適な実施形態について説明した。しかし、本発明は、前述の実施形態に限られず、前記の各構成要素については、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。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

例えば、前記実施形態では、親杭横矢板形式により形成された土留壁に対して本発明の土留壁構造を形成する場合について説明したが、図４の（ａ）に示すように、ＳＭＷにより構築された土留壁１０に対して土留壁構造１を構築してもよい。   For example, in the above-described embodiment, the case where the retaining wall structure of the present invention is formed on the retaining wall formed in the form of the main pile transverse sheet pile has been described. However, as shown in FIG. The retaining wall structure 1 may be constructed with respect to the retaining wall 10 made.

前記実施形態では、鋼材２２の内部にも充填材２３を充填したが、鋼材２２の内部への充填を省略してもよい。   In the above-described embodiment, the filler 23 is also filled in the steel material 22, but the filling of the steel material 22 may be omitted.

前記実施形態では、鋼材２２を縦孔２１の底面から上端まで配設するものとしたが、図４の（ｂ）に示すように、鋼材２２を、縦孔２１の下端部のみ配設してもよい。このとき、鋼材２２の頭部は土留壁１０に挿入する。   In the embodiment, the steel material 22 is disposed from the bottom surface to the upper end of the vertical hole 21, but the steel material 22 is disposed only at the lower end portion of the vertical hole 21 as shown in FIG. Also good. At this time, the head of the steel material 22 is inserted into the retaining wall 10.

前記実施形態では、既設の建物Ｂを残置させた状態で下方に新設部分Ｂａを増築する場合を例示したが、建物Ｂを解体して新たに建物全体を建て直してもよい。   In the above-described embodiment, the case where the newly installed portion Ba is extended downward while the existing building B is left is illustrated, but the building B may be disassembled and the entire building newly rebuilt.

１ 土留壁構造
１０ 土留壁
２１ 縦孔
２２ 鋼材
２３ 充填材 DESCRIPTION OF SYMBOLS 1 Earth retaining wall structure 10 Earth retaining wall 21 Vertical hole 22 Steel material 23 Filler

Claims (4)

既設の土留壁を貫通する縦孔を削孔する工程と、
前記縦孔に鋼材を挿入し、前記鋼材の下端を前記土留壁の下方に突出させる工程と、
前記縦孔の内壁面と前記鋼材との隙間に充填材を充填する工程と、を備えることを特徴とする、土留壁の増築方法。 Drilling a vertical hole penetrating an existing earth retaining wall;
Inserting a steel material into the vertical hole, and projecting a lower end of the steel material below the retaining wall;
And a step of filling the gap between the inner wall surface of the vertical hole and the steel material with a filler. 前記縦孔を、前記土留壁の芯材のフランジ間に形成することを特徴とする、請求項１に記載の土留壁の増築方法。   The method for extending a retaining wall according to claim 1, wherein the vertical hole is formed between flanges of a core material of the retaining wall. 前記鋼材が筒状部材からなり、前記鋼材の内部に充填材を充填することを特徴とする、請求項１または請求項２に記載の土留壁の増築方法。   The method for extending a retaining wall according to claim 1 or 2, wherein the steel material is a cylindrical member, and the steel material is filled with a filler. 既設の土留壁を貫通するように形成された縦孔と、
前記縦孔内に配設された鋼材と、
前記縦孔の内壁面と前記鋼材との隙間に充填された充填材と、を備え、
前記鋼材の下端が、前記土留壁の下端から下方に突出していることを特徴とする、土留壁構造。 A vertical hole formed so as to penetrate the existing retaining wall;
A steel material disposed in the longitudinal hole;
A filler filled in a gap between the inner wall surface of the vertical hole and the steel material,
A retaining wall structure, wherein a lower end of the steel material protrudes downward from a lower end of the retaining wall.
JP2011115252A 2011-05-23 2011-05-23 Retaining wall extension method and retaining wall structure Expired - Fee Related JP5512600B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013174049A (en) * 2012-02-23 2013-09-05 Taisei Corp Extension method for earth retaining wall and earth retaining wall structure
JP2015034411A (en) * 2013-08-09 2015-02-19 株式会社大林組 Pile and method of structuring pile
JP2015094098A (en) * 2013-11-11 2015-05-18 藤井　俊彦 Construction method of ground improvement wall

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013174049A (en) * 2012-02-23 2013-09-05 Taisei Corp Extension method for earth retaining wall and earth retaining wall structure
JP2015034411A (en) * 2013-08-09 2015-02-19 株式会社大林組 Pile and method of structuring pile
JP2015094098A (en) * 2013-11-11 2015-05-18 藤井　俊彦 Construction method of ground improvement wall

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