JP2009249891A - Retaining wall supporting structure and retaining wall supporting construction method - Google Patents

Retaining wall supporting structure and retaining wall supporting construction method Download PDF

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JP2009249891A
JP2009249891A JP2008098167A JP2008098167A JP2009249891A JP 2009249891 A JP2009249891 A JP 2009249891A JP 2008098167 A JP2008098167 A JP 2008098167A JP 2008098167 A JP2008098167 A JP 2008098167A JP 2009249891 A JP2009249891 A JP 2009249891A
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retaining wall
core material
improved body
bottom plate
wall supporting
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JP5388470B2 (en
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Yousuke Mizutani
水谷羊介
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Kanematsu NNK Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a retaining wall supporting structure and a retaining wall supporting construction method for enlarging a scope for applying construction to a columnar improving body by reinforcing a part where tensile force acts in the columnar improving body in a lower part of a retaining wall. <P>SOLUTION: This retaining wall supporting structure supports the retaining wall composed of a base and a wall part erected substantially vertically on the base and fill formed on a rear surface of the wall part of the retaining wall and is composed of the columnar improving body arranged in the ground in a lower part of the base and a core member entering the arranged improving body by the predetermined depth from an end part on a fill side and a head part in the predetermined scope. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、擁壁を安定して支持する、擁壁支持構造及び擁壁支持工法に関するものである。   The present invention relates to a retaining wall support structure and a retaining wall support method for stably supporting a retaining wall.

擁壁の下部地盤にセメント系固化材によって柱状改良体を構築し、擁壁を支持する場合がある。（図５）
柱状改良体は、一体となった擁壁下部の底版と、擁壁背面に埋め戻した土砂を支持する。
擁壁には埋め戻した土砂によって土圧が作用するが、埋め戻し土砂と擁壁の重量とによって打ち消され、柱状改良体には圧縮力が作用する。（図６） In some cases, a columnar improvement body is constructed on the lower ground of the retaining wall with a cement-based solidifying material to support the retaining wall. (Fig. 5)
The columnar improvements support the bottom plate of the lower part of the retaining wall and the earth and sand buried in the back of the retaining wall.
The earth pressure acts on the retaining wall due to the backfilled earth and sand, but is canceled by the backfill earth and sand and the weight of the retaining wall, and a compressive force acts on the columnar improvement body. (Fig. 6)

近年、経済性等の理由により、擁壁の高さに対する底版長が短くなり、擁壁の重量が軽くなる傾向がある。
このため、擁壁に埋め戻し土砂の土圧が作用すると、柱状改良体の頭部には長期において水平力が働き、柱状改良体には曲げモーメントが生じる。その曲げモーメントによって、擁壁下部の、埋め戻し土砂側の端部付近にかかる柱状改良体内部では部分的に引張力ｐ２が作用し続ける。（図７）
平成１４年発行の「改訂版 建築物のための改良地盤の設計及び品質管理指針―セメント系固化材を用いた深層・浅層混合処理工法―」（日本建設センター）では、改良体に長期的に引張力が作用することは認められていない。また、短期許容引張力は設計基準強度の２０％としている。
このため、セメント系固化材による柱状改良体の適応範囲が極端に狭くなっている。 In recent years, for reasons such as economy, the bottom plate length with respect to the height of the retaining wall is shortened, and the weight of the retaining wall tends to be reduced.
For this reason, when the earth pressure of backfill earth and sand acts on a retaining wall, a horizontal force will act on the head of a columnar improvement body in the long term, and a bending moment will arise in a columnar improvement body. Due to the bending moment, the tensile force p2 continues to act partially inside the columnar improvement body in the vicinity of the end portion on the backfill earth and sand side below the retaining wall. (Fig. 7)
“Revised design and quality control guideline for buildings-Deep and shallow mixed treatment method using cement-based solidification material” (Nippon Construction Center) published in 2002 It is not recognized that a tensile force acts on. The short-term allowable tensile force is 20% of the design standard strength.
For this reason, the applicable range of the columnar improvement body by a cement-type solidification material is extremely narrow.

本発明は、擁壁下部の柱状改良体における引張力の作用する部分を補強することにより、柱状改良体の施工適応範囲を拡大することを目的とする。   An object of this invention is to expand the construction adaptation range of a columnar improvement body by reinforcing the part which the tensile force acts in the columnar improvement body of a retaining wall lower part.

上記目的を達成するためになされた本願の第１発明は、底版と前記底版に略垂直に立設する壁部とからなる擁壁と、前記擁壁の壁部背面に形成する盛土と、を支持する擁壁支持構造であって、前記底版の下部の地盤中に配列する柱状の改良体と、前記配列する改良体の、盛土側端部から所定範囲の頭部から所定の深さに貫入した芯材と、からなることを特徴とする、擁壁支持構造を提供するものである。
本願の第２発明は、第1発明に記載の擁壁支持構造であって、前記芯材は鋼管、鉄筋又は鋼棒であることを特徴とする、擁壁支持構造を提供するものである。
本願の第３発明は、底版と前記底版に略垂直に立設する壁部とからなる擁壁と、前記擁壁の壁部背面に形成する盛土と、を支持する擁壁支持工法であって、前記底版を設置する地盤の下部の地盤中に柱状の改良体を配列して形成し、前記改良体が硬化する前に、配列した前記改良体の、盛土側端部から所定範囲の頭部から、芯材を所定の深さまで貫入し、前記芯材を貫入した状態で改良体が固化したことを特徴とする、擁壁支持工法を提供するものである。 The first invention of the present application made to achieve the above object comprises a retaining wall comprising a bottom slab and a wall portion standing substantially perpendicular to the bottom slab, and an embankment formed on the back of the wall portion of the retaining wall. A retaining wall support structure for supporting, wherein a columnar improvement body arranged in the lower ground of the bottom slab, and an insertion of the arrangement improvement body from a bank-side end portion to a predetermined depth from a head of a predetermined range A retaining wall support structure is provided, characterized in that the retaining wall support structure is provided.
A second invention of the present application provides the retaining wall support structure according to the first invention, wherein the core material is a steel pipe, a reinforcing bar, or a steel rod.
The third invention of the present application is a retaining wall support method for supporting a retaining wall composed of a bottom slab and a wall portion standing substantially perpendicular to the bottom slab, and a fill formed on the back surface of the retaining wall. The column-shaped improvement body is formed by arranging in the ground below the ground where the bottom plate is installed, and before the improvement body is hardened, the head of a predetermined range from the embankment side end of the improvement body From the above, the retaining wall supporting method is provided, wherein the core material is penetrated to a predetermined depth, and the improved body is solidified with the core material penetrated.

本発明は、上記した課題を解決するための手段により、次のような効果の少なくとも一つを得ることができる。
＜１＞擁壁下部に配列した柱状の改良体に芯材を貫入し、引張力に対する強度を付加することにより擁壁の安定した支持地盤として使用することができる。
＜２＞硬化前の改良体に対し、所定の範囲に芯材を貫入するのみであるため、容易に施工することができる。 The present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> It can be used as a stable supporting ground for a retaining wall by penetrating a core material into a columnar improvement body arranged at the lower part of the retaining wall and adding strength against tensile force.
<2> Since the core material is only penetrated into a predetermined range with respect to the improved body before curing, it can be easily constructed.

以下、図面を参照しながら本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（１）本発明の全体の構成
本発明の擁壁支持構造は、擁壁１の底版１１下部に配列する改良体２と、改良体２内部に設けた芯材３と、からなる。（図１）
以下、各構成部材について詳述する。 (1) Overall configuration of the present invention The retaining wall support structure of the present invention includes an improved body 2 arranged at the bottom of the bottom plate 11 of the retaining wall 1 and a core member 3 provided in the improved body 2. (Figure 1)
Hereinafter, each component will be described in detail.

＜１＞擁壁
擁壁１はコンクリート製のプレキャスト部材である。
擁壁１は底版１１と、底版１１に略垂直に立設する壁部１２からなる、Ｌ型又は逆Ｔ型の部材である。
擁壁１は地盤上に配置し、壁部１２の背面に土砂を埋め戻して盛土４を形成する。 <1> Retaining wall The retaining wall 1 is a precast member made of concrete.
The retaining wall 1 is an L-shaped or inverted T-shaped member that includes a bottom plate 11 and a wall portion 12 that stands substantially perpendicular to the bottom plate 11.
The retaining wall 1 is arranged on the ground, and earth and sand are backfilled on the back surface of the wall portion 12 to form the embankment 4.

＜２＞改良体
改良体２はソイルセメントからなる柱状の部材である。
改良体２は擁壁１の底版１１の下部の地盤中に配列する。
改良体２は隣接する改良体２に端部をラップ又は接触させて、連続して配列する。（図２）
このように配列することにより、改良体２は一体となって擁壁１及び盛土４を支持する。 <2> Improved body Improved body 2 is a columnar member made of soil cement.
The improved body 2 is arranged in the ground below the bottom plate 11 of the retaining wall 1.
The improvement bodies 2 are arranged in succession by wrapping or contacting the ends with the adjacent improvement bodies 2. (Figure 2)
By arranging in this way, the improved body 2 integrally supports the retaining wall 1 and the embankment 4.

＜３＞芯材
芯材３は改良体２の一部に貫入して内挿する部材である。
芯材３は鋼管、鉄筋又は鋼棒からなる。 <3> Core Material The core material 3 is a member that penetrates into a part of the improved body 2 and is inserted.
The core material 3 consists of a steel pipe, a reinforcing bar, or a steel bar.

擁壁１の壁部１２の背面には盛土４により、土圧が作用する。このとき、改良体２の頭部には長期において水平力が働き、配列した改良体２には曲げモーメントが生じる。この曲げモーメントにより、盛土４側の端部付近の改良体２の頭部には引張力が作用することになる。
底版１１の長さが十分でないと、擁壁１の重量と盛土４の重量よりも曲げモーメントによる引張力の方が大きくなる。
これによって、底版１１の盛土４側の端部付近の下部に位置する改良体２の頭部には引張力ｐ２が作用しつづける。（図３）
このため、改良体２の引張力の作用する部分に、改良体２の頭部から所定の深度まで芯材３を内挿し、引張力に対する強度を付加する。 Earth pressure acts on the back surface of the wall portion 12 of the retaining wall 1 by the embankment 4. At this time, a horizontal force acts on the head of the improved body 2 over a long period of time, and a bending moment is generated in the arranged improved bodies 2. Due to this bending moment, a tensile force acts on the head of the improved body 2 near the end on the embankment 4 side.
If the length of the bottom plate 11 is not sufficient, the tensile force due to the bending moment becomes larger than the weight of the retaining wall 1 and the weight of the embankment 4.
As a result, the tensile force p2 continues to act on the head of the improved body 2 located in the lower part of the bottom plate 11 near the end on the embankment 4 side. (Figure 3)
For this reason, the core material 3 is interpolated from the head of the improved body 2 to a predetermined depth in a portion where the tensile force of the improved body 2 acts, and strength against the tensile force is added.

（２）本発明の構築方法
次に上記の擁壁支持構造の構築方法について説明する。 (2) Construction method of the present invention Next, a construction method of the retaining wall support structure will be described.

＜１＞改良体の形成
擁壁１を配置する地盤中に改良体２を形成する。（図４ａ）
改良体２はセメント系固化材を地盤中に注入しながら、撹拌混合装置により地盤とセメント系固化材とを撹拌混合して形成する。
改良体２は擁壁１を支持するように、底版１１の配置位置の下部に配列しながら形成する。
改良体２は１本ずつ連続させて形成してもよいし、１本おきの間隔をおいて形成した後に、既設の改良体２間に新たに改良体２を形成することにより連続させてもよい。 <1> Formation of improved body The improved body 2 is formed in the ground where the retaining wall 1 is disposed. (Fig. 4a)
The improved body 2 is formed by stirring and mixing the ground and the cement-based solidified material with a stirring and mixing device while injecting the cement-based solidified material into the ground.
The improved body 2 is formed while being arranged at the lower part of the arrangement position of the bottom plate 11 so as to support the retaining wall 1.
The improvement bodies 2 may be formed continuously one by one, or after being formed at intervals of every other line, the improvement bodies 2 may be continuously formed by newly forming the improvement bodies 2 between the existing improvement bodies 2. Good.

＜２＞芯材の貫入
改良体２形成後、改良体２のセメント系固化材が硬化する前に、芯材３を貫入する。（図４ｂ）
貫入は、圧入又は回転圧入により行う。
芯材３は改良体２のうちの、引張力が作用する、底版１１の盛土４側の端部付近の下部に位置する改良体２の頭部に貫入する。
芯材３は改良体２の硬化前に貫入するため、容易に貫入することができる。
芯材３貫入後、改良体２のセメント系固化材が硬化し、改良体２と芯材３が一体となる。
通常、改良体２は圧縮耐力に比べて引張耐力は弱い。そのため、芯材３の貫入後に改良体２が硬化して芯材３と改良体２とが一体となることによって、改良体２に引張力に対する強度を付与することができる。
また、芯材３は引張力の作用する部分にのみ貫入すれば良いため、低コストで、容易に施工することができる。 <2> Penetration of core material After the improved body 2 is formed, the core material 3 is penetrated before the cement-based solidified material of the improved body 2 is cured. (Fig. 4b)
Penetration is performed by press-fitting or rotary press-fitting.
The core material 3 penetrates into the head of the improved body 2 located at the lower part of the improved body 2 near the end of the bottom plate 11 on the embankment 4 side where the tensile force acts.
Since the core material 3 penetrates before the improved body 2 is cured, it can be easily penetrated.
After penetration of the core material 3, the cement-based solidified material of the improved body 2 is cured, and the improved body 2 and the core material 3 are integrated.
Usually, the improved body 2 has a weak tensile strength compared to the compression strength. For this reason, the improved body 2 is cured after the core material 3 penetrates, and the core material 3 and the improved body 2 are integrated, whereby the strength against the tensile force can be imparted to the improved body 2.
Moreover, since the core material 3 should just penetrate | invade only into the part to which a tensile force acts, it can construct easily at low cost.

＜３＞擁壁の設置
改良体２を形成した地盤上に擁壁１を配置する。
その後、擁壁１の背面に土砂を埋め戻し、盛土４を形成する。（図４ｃ） <3> Installation of retaining wall The retaining wall 1 is arranged on the ground on which the improved body 2 is formed.
Thereafter, earth and sand are backfilled on the back surface of the retaining wall 1 to form the embankment 4. (Fig. 4c)

盛土４を形成すると、埋め戻した土砂により擁壁１の背面に作用する土圧によって、底版１１の盛土４側の端部付近の下部に位置する改良体２の頭部には引張力が作用する。
この部分において、改良体２と芯材３が一体となって引張力に対する強度が増しているため、安定した擁壁支持構造とすることができる。 When the embankment 4 is formed, a tensile force acts on the head of the improved body 2 located at the lower part of the bottom plate 11 near the end of the embankment 4 side due to earth pressure acting on the back surface of the retaining wall 1 by the backfilled earth and sand. To do.
In this portion, the improved body 2 and the core material 3 are integrated and the strength against tensile force is increased, so that a stable retaining wall support structure can be obtained.

本発明にかかる擁壁支持構造の説明図Explanatory drawing of the retaining wall support structure concerning this invention 本発明にかかる擁壁支持構造の断面図Sectional drawing of the retaining wall support structure concerning this invention 本発明にかかる擁壁支持構造の説明図Explanatory drawing of the retaining wall support structure concerning this invention 本発明にかかる擁壁支持工法の説明図Illustration of retaining wall support method according to the present invention 従来の擁壁支持構造の説明図Illustration of conventional retaining wall support structure 従来の擁壁支持構造の説明図Illustration of conventional retaining wall support structure 従来の擁壁支持構造の説明図Illustration of conventional retaining wall support structure

符号の説明Explanation of symbols

１・・・・擁壁
１１・・・底版
１２・・・壁部
２・・・・改良体
３・・・・芯材
４・・・・盛土 DESCRIPTION OF SYMBOLS 1 ... Retaining wall 11 ... Bottom plate 12 ... Wall part 2 ... Improved body 3 ... Core material 4 ... Filling

Claims (3)

底版と前記底版に略垂直に立設する壁部とからなる擁壁と、前記擁壁の壁部背面に形成する盛土と、を支持する擁壁支持構造であって、
前記底版の下部の地盤中に配列した柱状の改良体と、
前記配列する改良体の、盛土側端部から所定範囲の頭部から所定の深さに貫入した芯材と、からなることを特徴とする、
擁壁支持構造。 A retaining wall support structure for supporting a retaining wall composed of a bottom plate and a wall portion standing substantially perpendicular to the bottom plate, and a fill formed on the rear surface of the wall portion of the retaining wall,
Columnar improvements arranged in the lower ground of the bottom plate,
The improvement body to be arranged is characterized by comprising a core material penetrating at a predetermined depth from a head in a predetermined range from an end portion on the embankment side,
Retaining wall support structure. 請求項１に記載の擁壁支持構造であって、前記芯材は鋼管、鉄筋又は鋼棒であることを特徴とする、擁壁支持構造。 The retaining wall support structure according to claim 1, wherein the core material is a steel pipe, a reinforcing bar, or a steel rod. 底版と前記底版に略垂直に立設する壁部とからなる擁壁と、前記擁壁の壁部背面に形成する盛土と、を支持する擁壁支持工法であって、
前記底版を設置する地盤の下部の地盤中に柱状の改良体を配列して形成し、
前記改良体が硬化する前に、配列した前記改良体の、盛土側端部から所定範囲の頭部から、芯材を所定の深さまで貫入し、
前記芯材を貫入した状態で改良体が固化したことを特徴とする、
擁壁支持工法。 A retaining wall support method for supporting a retaining wall composed of a bottom slab and a wall portion standing substantially perpendicular to the bottom slab, and an embankment formed on the rear surface of the retaining wall,
Formed by arranging columnar improvements in the ground below the ground where the bottom plate is installed,
Before the improved body hardens, from the head of the predetermined range from the embankment side end of the arranged improved body, penetrate the core material to a predetermined depth,
The improved body is solidified in a state of penetrating the core material,
Retaining wall support method.
JP2008098167A 2008-04-04 2008-04-04 Retaining wall support structure and retaining wall support method Active JP5388470B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5569849B1 (en) * 2013-07-12 2014-08-13 強化土株式会社 Liquefaction countermeasure construction method and liquefaction countermeasure improvement ground
JP2015229881A (en) * 2014-06-05 2015-12-21 株式会社竹中工務店 Structure
JP7474686B2 (en) 2020-11-27 2024-04-25 株式会社リアス Soft ground improvement body and construction method of soft ground improvement body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62185915A (en) * 1986-02-10 1987-08-14 Shimizu Constr Co Ltd Deep layer mixing treatment work using geotextile
JPH04179730A (en) * 1990-11-15 1992-06-26 Haseko Corp Soil cement column, soil cement column row and method for constructing soil cement column row

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62185915A (en) * 1986-02-10 1987-08-14 Shimizu Constr Co Ltd Deep layer mixing treatment work using geotextile
JPH04179730A (en) * 1990-11-15 1992-06-26 Haseko Corp Soil cement column, soil cement column row and method for constructing soil cement column row

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5569849B1 (en) * 2013-07-12 2014-08-13 強化土株式会社 Liquefaction countermeasure construction method and liquefaction countermeasure improvement ground
JP2015229881A (en) * 2014-06-05 2015-12-21 株式会社竹中工務店 Structure
JP7474686B2 (en) 2020-11-27 2024-04-25 株式会社リアス Soft ground improvement body and construction method of soft ground improvement body

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