JP6328312B1 - Self-supporting retaining wall and its basic structure - Google Patents
Self-supporting retaining wall and its basic structure Download PDFInfo
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- JP6328312B1 JP6328312B1 JP2017239601A JP2017239601A JP6328312B1 JP 6328312 B1 JP6328312 B1 JP 6328312B1 JP 2017239601 A JP2017239601 A JP 2017239601A JP 2017239601 A JP2017239601 A JP 2017239601A JP 6328312 B1 JP6328312 B1 JP 6328312B1
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- 239000011162 core material Substances 0.000 claims abstract description 53
- 239000012779 reinforcing material Substances 0.000 claims abstract description 42
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 35
- 239000000945 filler Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 description 14
- 239000004568 cement Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
【課題】補強材による補強機能を備えた擁壁の基礎構造とこれを用いた自立式擁壁を提供する。【解決手段】地盤面から地中にわたって形成した改良体１１と、下部を改良体１１内に同心状に配置した芯材１２と、改良体１１の頭部において芯材１２の外周に同心状に配置した円筒状の補強材１３と、を備え、補強材１３の改良体１１内への埋設深さを選択することによって、擁壁の要求性能に応じた補強効果を任意に設定可能に構成したことを特徴とする。自立式擁壁１は、基礎構造の芯材１２の上部で壁面２０を支持してなり、壁面２０は、複数の矩形の擁壁パネル２１を鉛直方向及び水平方向に連続して構成したことを特徴とする。【選択図】図１The present invention provides a retaining wall basic structure having a reinforcing function by a reinforcing material and a self-supporting retaining wall using the retaining wall. An improved body 11 formed from the ground surface to the ground, a core material 12 having a lower portion disposed concentrically in the improved body 11, and a concentric outer periphery of the core material 12 at the head of the improved body 11. The cylindrical reinforcing member 13 is arranged, and the reinforcing effect according to the required performance of the retaining wall can be arbitrarily set by selecting the embedding depth of the reinforcing member 13 in the improved body 11. It is characterized by that. The self-supporting retaining wall 1 supports the wall surface 20 at the upper part of the core 12 of the foundation structure, and the wall surface 20 is configured by continuously forming a plurality of rectangular retaining wall panels 21 in the vertical direction and the horizontal direction. Features. [Selection] Figure 1
Description
本発明は、自立式擁壁及びその基礎構造に関する。 The present invention relates to a self-supporting retaining wall and its foundation structure.
傾斜地における宅地造成工事では、切土や盛土によって形成された段差部の崩壊を防ぐため谷側の端部に擁壁を構築する。
擁壁にかかる従来技術として、断面Ｌ字型のプレキャストコンクリート体の自重と土の荷重で側圧に抵抗するＬ型擁壁や、傾斜状に積み上げた間知石やブロックの自重で側圧に抵抗する練積擁壁などが存在する。
しかし、Ｌ型擁壁は工事費が高い上に不同沈下を招きやすく、練積擁壁は設置面積が広く敷地の無駄が多いという欠点がある。また、いずれの擁壁も地震等による想定外の土圧に対応できず、上部構造物に損害が生ずる可能性がある。
このため、これらの欠点を解消するため、コンクリート製の擁壁パネルとソイルセメント合成杭の一体構造からなる自立式擁壁が広く施工されている（特許文献１）。
従来技術の自立式擁壁は、地盤にソイルセメント改良体を形成してＨ鋼や鋼管等の芯材を建て込み、擁壁パネルを芯材に挿通させながら積み上げて壁面を構成する。擁壁パネルの自重と土圧の鉛直成分をソイルセメント合成杭による鉛直支持力で支持する。
In residential land creation work on sloping ground, a retaining wall is constructed at the end of the valley side to prevent the collapse of the stepped part formed by cutting or embankment.
As a conventional technique for retaining walls, L-shaped retaining walls that resist lateral pressure due to the weight of the precast concrete body with an L-shaped cross section and soil load, and resisting lateral pressure due to the weight of stones and blocks stacked in an inclined shape There is a retaining wall.
However, the L-type retaining wall has a high construction cost and is liable to cause uneven settlement, and the laminated retaining wall has a disadvantage that it has a large installation area and a lot of waste on the site. In addition, none of the retaining walls can cope with an unexpected earth pressure due to an earthquake or the like, which may cause damage to the superstructure.
For this reason, in order to eliminate these faults, a self-supporting retaining wall composed of an integral structure of a concrete retaining wall panel and a soil cement synthetic pile has been widely constructed (Patent Document 1).
The self-supporting retaining wall of the prior art forms a wall surface by forming a soil cement improved body on the ground, building a core material such as H steel or steel pipe, and stacking the retaining wall panel through the core material. The vertical components of the weight and earth pressure of the retaining wall panel are supported by the vertical bearing force of the soil cement composite pile.
従来技術には以下のような問題点がある。
＜１＞改良体の亀裂による鉛直支持力低下のおそれがある。
擁壁パネルの自重等の設計荷重を、芯材を介してスムーズかつ安全に伝達させるため、芯材とソイルセメント改良体の付着力が設計荷重を上回る必要がある。ところが、ソイルセメントは引張に弱いため、地震時などに背面土から水平荷重を受けると杭頭部に亀裂が生じ、ソイルセメント改良体が芯材から剥離するおそれがある。これによって芯材とソイルセメントの付着強度が低下すると、設計上の鉛直支持力を確保できず、擁壁の安全性を損なうおそれがある。
＜２＞材料コストが高く施工効率が悪い。
地盤の状況や上部構造物の荷重状況などの条件が良好でない環境では、擁壁により高い性能が要求されるため、大径の改良体や高規格の芯材などが必要となる。このため、材料コストが嵩む上、施工時間が長期になるため施工効率が悪い。
The prior art has the following problems.
<1> There is a possibility that the vertical supporting force is reduced due to the crack of the improved body.
In order to transmit the design load such as the weight of the retaining wall panel smoothly and safely through the core material, the adhesion force between the core material and the soil cement improved body needs to exceed the design load. However, since soil cement is weak to tension, when a horizontal load is applied from the back soil during an earthquake or the like, the pile head is cracked, and the soil cement improved body may peel from the core material. If the adhesion strength between the core material and the soil cement is lowered by this, the design vertical support force cannot be secured, and the safety of the retaining wall may be impaired.
<2> Material cost is high and construction efficiency is poor.
In an environment where conditions such as the ground condition and the load condition of the superstructure are not good, a high performance is required for the retaining wall, so a large-diameter improved body or a high-standard core material is required. For this reason, the material cost increases and the construction time is long, so the construction efficiency is poor.
本発明の目的は、以上のような問題点を解決できる、自立式擁壁及びその基礎構造を提供することにある。 An object of the present invention is to provide a self-supporting retaining wall and its foundation structure that can solve the above-described problems.
本発明の擁壁の基礎構造は、改良体と、下部を改良体内に同心状に配置した芯材と、芯材の外周に配置した円筒状の補強材と、を備えることを特徴とする。
この構成によれば、補強材の埋設深さや規格を選択することによって、要求性能に応じた補強構造を簡易かつ低コストに設定することができる。
The basic structure of the retaining wall of the present invention includes an improved body, a core material having a lower portion concentrically disposed in the improved body, and a cylindrical reinforcing material disposed on the outer periphery of the core material.
According to this structure, the reinforcement structure according to a required performance can be set simply and at low cost by selecting the embedding depth and specification of a reinforcing material.
本発明の擁壁の基礎構造は、補強材の外周にリング状又はらせん状の補強リブを設けてもよい。
この構成によれば、補強材の強度を高め、外圧に対する高い抵抗力を発揮することができる。
The basic structure of the retaining wall of the present invention may be provided with ring-shaped or spiral-shaped reinforcing ribs on the outer periphery of the reinforcing material.
According to this configuration, the strength of the reinforcing material can be increased and high resistance to external pressure can be exhibited.
本発明の擁壁の基礎構造は、補強材を芯材に連結してもよい。
この構成によれば、芯材の建て込みと同時に補強材を埋設できるので、施工効率を高めることができる。
In the basic structure of the retaining wall of the present invention, the reinforcing material may be connected to the core material.
According to this configuration, since the reinforcing material can be embedded at the same time as the core material is built, the construction efficiency can be improved.
本発明の自立式擁壁は、基礎構造の芯材で、擁壁パネルを連続してなる壁面を支持したことを特徴とする。
この構成によれば、補強材によって杭頭部の亀裂を防ぐことで鉛直支持力の低下を防止すると共に、補強材の補強効果によって高い水平支持力を発揮することができる。
The self-supporting retaining wall of the present invention is characterized by supporting a wall surface formed by continuously holding a retaining wall panel with a core material of a foundation structure.
According to this configuration, the vertical support force can be prevented from being lowered by preventing cracks in the pile head by the reinforcing material, and a high horizontal supporting force can be exhibited by the reinforcing effect of the reinforcing material.
本発明の自立式擁壁は、補強材の上部が改良体から上方に突出していてもよい。
この構成によれば、基礎構造と壁面の一体性を強化し、自立式擁壁の水平支持力を向上させることができる。
In the self-supporting retaining wall of the present invention, the upper portion of the reinforcing material may protrude upward from the improved body.
According to this configuration, the integrity of the foundation structure and the wall surface can be strengthened, and the horizontal supporting force of the self-supporting retaining wall can be improved.
本発明の自立式擁壁は、擁壁パネルが、矩形面状のパネル部と、パネル部の中央背面側に突起する控え部と、控え部を上下に連通する連結孔と、を有し、芯材が連結孔内に位置し、芯材と連結孔の間に充填材を配置してもよい。
この構成によれば、簡易な構造でもって壁面を構成することができる。
In the self-supporting retaining wall of the present invention, the retaining wall panel has a panel portion having a rectangular surface shape, a retaining portion projecting on the center back side of the panel portion, and a connecting hole communicating with the retaining portion vertically. A core material may be located in a connection hole, and a filler may be arrange | positioned between a core material and a connection hole.
According to this configuration, the wall surface can be configured with a simple structure.
本発明の自立式擁壁及びその基礎構造は、以上の構成を備えるため、次の効果のうち少なくとも一つを備える。
＜１＞鉛直支持力の確保。
改良体内に補強材を介在させることによって、改良体と芯材との付着強度を高め、改良体に水平力が作用した際に発生する亀裂を防止することができる。これによって、擁壁の鉛直支持力の低下を防ぐことができる。
＜２＞水平支持力の向上。
改良体内に補強材を埋設する簡易な構造でもって、水平地盤反力係数の増大、せん断強度の増大、曲げ強度の増大等の補強機能を発揮し、擁壁の水平支持力を向上させることができる。
＜３＞水平変位量の縮小。
改良体内に補強材を埋設する簡易な構造でもって、擁壁の水平変位量を縮小させることができる。
＜４＞簡易かつ低コストな補強効果。
地盤の状況や上部構造物からの荷重状況に鑑みて、補強材の長さを変化させるだけで、簡易かつ低コストで要求性能に見合った補強効果を奏することができる。
Since the self-supporting retaining wall and the foundation structure of the present invention have the above-described configuration, they have at least one of the following effects.
<1> Ensuring vertical support force.
By interposing the reinforcing material in the improved body, it is possible to increase the adhesion strength between the improved body and the core material, and to prevent a crack generated when a horizontal force acts on the improved body. Thereby, the fall of the vertical supporting force of a retaining wall can be prevented.
<2> Improvement of horizontal support force.
With a simple structure that embeds the reinforcing material in the improved body, it can exert reinforcing functions such as an increase in the horizontal ground reaction force coefficient, an increase in shear strength, and an increase in bending strength, thereby improving the horizontal support force of the retaining wall. it can.
<3> Reduction of horizontal displacement.
The horizontal displacement of the retaining wall can be reduced with a simple structure in which a reinforcing material is embedded in the improved body.
<4> Simple and low-cost reinforcement effect.
In view of the condition of the ground and the load from the upper structure, it is possible to obtain a reinforcing effect that meets the required performance simply and at low cost simply by changing the length of the reinforcing material.
以下、図面を参照しながら本発明の自立式擁壁及びその基礎構造について詳細に説明する。
説明の便宜上、擁壁の基礎構造は自立式擁壁の説明内で記載する。
なお、本明細書等において「鉛直」「水平」とは必ずしも完全な鉛直性や水平性を意味するものではなく、縦方向、横方向という程度の意味である。
Hereinafter, the self-supporting retaining wall and the foundation structure of the present invention will be described in detail with reference to the drawings.
For convenience of explanation, the foundation structure of the retaining wall is described in the description of the self-supporting retaining wall.
In the present specification and the like, “vertical” and “horizontal” do not necessarily mean complete verticality or horizontality, but mean vertical and horizontal directions.
[自立式擁壁]
＜１＞全体の構成（図１）。
本発明の自立式擁壁１は、擁壁パネルの曲げ剛性と支柱杭の横抵抗によって背面の土圧を支持する構造物である。
自立式擁壁１は、改良体１１、芯材１２、及び補強材１３を一体に構成した基礎構造１０と、芯材１２の上部で支持した壁面２０と、を少なくとも備える。
本発明の自立式擁壁１は、補強材１３によって杭頭部の亀裂を防ぐことで鉛直支持力の低下を防止すると共に、補強材１３の補強効果によって高い水平支持力を発揮できる点に特徴を有する。
[Self-standing retaining wall]
<1> Overall configuration (FIG. 1).
The self-supporting retaining wall 1 of the present invention is a structure that supports the earth pressure on the back surface by the bending rigidity of the retaining wall panel and the lateral resistance of the pillar pile.
The self-supporting retaining wall 1 includes at least a
The self-supporting retaining wall 1 of the present invention is characterized in that the vertical support force is prevented from being lowered by preventing cracks in the pile head by the reinforcing material 13 and that a high horizontal supporting force can be exhibited by the reinforcing effect of the reinforcing material 13. Have
＜２＞基礎構造（図２）。
基礎構造１０は、自立式擁壁１の杭及び支柱を一体に構成する構造である。
基礎構造１０は、地中に形成した柱状の改良体１１と、改良体１１の芯部に配置した長尺の芯材１２と、改良体１１の頭部に配置した円筒状の補強材１３と、を備える。
本例では、基礎構造１０として、ソイルセメントの改良体１１とＨ鋼の芯材１２を用いたＨ鋼ソイルセメント杭を採用する。
芯材１２の上部は地盤から上方に突出して壁面２０を支持する支柱とする。
Ｈ鋼ソイルセメント杭は軟弱地盤にも適用可能であり、芯材１２を深く根入れすることで、滑動に対する高い抵抗性を発揮することができる。但し、基礎構造１０はＨ鋼ソイルセメント杭に限られず、例えば、鋼管ソイルセメント杭などであってもよい。
本発明の基礎構造１０は、補強材１３の改良体１１内への埋設深さや規格を調整することによって、擁壁の要求性能に応じた補強機能を、簡易かつ低コストに確保できる点に特徴を有する。
<2> Basic structure (FIG. 2).
The
The
In this example, an H steel soil cement pile using an improved body 11 of soil cement and a core material 12 of H steel is adopted as the
The upper part of the core material 12 is a column that protrudes upward from the ground and supports the wall surface 20.
The H steel soil cement pile can also be applied to soft ground, and by deeply incorporating the core material 12, high resistance to sliding can be exhibited. However, the
The
＜２．１＞補強材。
補強材１３は、基礎構造１０を補強するための部材である。ここで「補強」とは次項で詳述する各作用効果の少なくとも一つを含んだものを意味する。
本例では、補強材１３として円形鋼管を採用する。
補強材１３は、改良体１１の頭部において芯材１２の外周に同心状に配置する。
すなわち、杭頭部の平面視において、芯材１２の周囲を補強材１３が囲み、芯材１２と補強材１３の間及び補強材１３の周囲に改良体１１が配置する。
補強材１３の長さ、径、厚さ等の規格は、自立式擁壁１に要求される性能に応じて適宜設定する。
<2.1> Reinforcing material.
The reinforcing material 13 is a member for reinforcing the
In this example, a circular steel pipe is employed as the reinforcing member 13.
The reinforcing member 13 is disposed concentrically on the outer periphery of the core member 12 at the head of the improved body 11.
That is, in the plan view of the pile head, the reinforcing material 13 surrounds the periphery of the core material 12, and the improved body 11 is arranged between the core material 12 and the reinforcing material 13 and around the reinforcing material 13.
Standards such as the length, diameter, and thickness of the reinforcing member 13 are appropriately set according to the performance required for the self-supporting retaining wall 1.
＜２．２＞補強材の機能。
本発明の自立式擁壁１は、改良体１１の頭部に補強材１３を配置することによって、以下の補強効果を発揮することができる。
（１）改良体１１に水平力が作用した際に発生する亀裂を防止することで、改良体１１と芯材１２との付着強度を高めることができる。これによって、鉛直支持力の低下を防ぐことができる。
（２）水平地盤反力係数を増大させることができる。
補強材１３の拘束効果によって改良体１１の亀裂を抑制することで、改良体１３周辺の地盤バネを有効に利用し、水平地盤反力係数を増大させることができる。
（３）杭体のせん断強度を増大させることができる。
擁壁パネル２１に作用する土圧は一体となって基礎構造１０の頭部に作用するが、補強材１３がせん断強度の乏しい改良体１１を拘束することで、改良体１１、芯材１２、及び補強材１３が一体となってせん断力を負担できるため、せん断強度を増大させることができる。
（４）杭体の曲げ強度を増大させることができる。
水平地盤反力係数（地盤バネ）が増大することにより、芯材１２に伝わる曲げ応力が小さくなり、また、改良体１１、芯材１２、及び補強材１３が一体となって曲げ応力を負担できるため、曲げ強度を増大させることができる。
（５）自立式擁壁の水平変位量を縮小させることができる。
水平地盤反力係数が増大することにより、水平変位量を縮小させることができる。
本発明の基礎構造１０は、補強材１３の改良体１１内への埋設深さや規格を調整することによって、地盤の状況や上部構造物からの荷重状況に応じた補強効果を任意に設定することができる。
<2.2> Function of the reinforcing material.
The self-supporting retaining wall 1 of the present invention can exert the following reinforcing effect by arranging the reinforcing member 13 on the head of the improved body 11.
(1) The adhesion strength between the improved body 11 and the core material 12 can be increased by preventing cracks that occur when a horizontal force acts on the improved body 11. Thereby, the fall of a vertical supporting force can be prevented.
(2) The horizontal ground reaction force coefficient can be increased.
By suppressing the crack of the improved body 11 by the restraining effect of the reinforcing material 13, the ground spring around the improved body 13 can be effectively used and the horizontal ground reaction force coefficient can be increased.
(3) The shear strength of the pile can be increased.
The earth pressure acting on the
(4) The bending strength of the pile body can be increased.
By increasing the horizontal ground reaction force coefficient (ground spring), the bending stress transmitted to the core material 12 is reduced, and the improved body 11, the core material 12, and the reinforcing material 13 can be integrated to bear the bending stress. Therefore, the bending strength can be increased.
(5) The amount of horizontal displacement of the self-supporting retaining wall can be reduced.
The horizontal displacement amount can be reduced by increasing the horizontal ground reaction force coefficient.
The
＜３＞壁面。
壁面２０は、複数の擁壁パネル２１を鉛直方向に積み上げ、これを水平方向に連続することで構成する。
本例では、水平方向の擁壁パネル２１同士は連結しないが、これを連結してもよい。
<3> Wall surface.
The wall surface 20 is configured by stacking a plurality of retaining
In this example, the horizontal
＜３．１＞擁壁パネル（図３）。
擁壁パネル２１は、壁面２０を構成する面状の構成要素である。
本例では、擁壁パネル２１として、矩形面状のパネル部２１ａと、パネル部２１ａの中央から背面側に突起する控え部２１ｂと、控え部２１ｂを上下方向に連通する連結孔２１ｃと、を備えたプレキャストコンクリートブロックを採用する。
なお、壁面２０の最上段に用いる擁壁パネル２１は、背面の地盤上に控え部２１ｂを露出させないため、控え部２１ｂの上部をパネル部２１ａの上部より下げて設計する。
連結孔２１ｃ内には、基礎構造１０の芯材１２が挿通され、連結孔２１ｃ内にコンクリート等の充填材２２が充填されることによって、擁壁パネル２１が基礎構造１０と一体に連結される。
なお、擁壁パネル２１の構造はこれに限られず、例えばパネル部２１ａの中央に肉厚部を設け、肉厚部の中心に連結孔２１ｃを連通させる構造などであってもよい。
<3.1> Retaining wall panel (FIG. 3).
The retaining
In this example, as the retaining
The retaining
The core material 12 of the
The structure of the
[施工方法]
引き続き、本発明の自立式擁壁の施工方法について詳細に説明する。
＜１＞改良体の形成。
攪拌混合装置によって、セメント系固化材を地盤に注入しながら攪拌混合し、地中に柱状の改良体１１を形成する。
同様にして、擁壁の連続方向に沿って所定間隔で所定数の改良体１１を形成する。
[Construction method]
Next, the construction method of the self-supporting retaining wall of the present invention will be described in detail.
<1> Formation of an improved body.
The cement-type solidified material is stirred and mixed with the stirring and mixing device while being poured into the ground, and the columnar improvement body 11 is formed in the ground.
Similarly, a predetermined number of improvement bodies 11 are formed at predetermined intervals along the continuous direction of the retaining wall.
＜２＞芯材の建て込み。
改良体１１が未硬化の内に改良体１１内に芯材１２のＨ鋼を建て込む。
芯材１２の鉛直性と芯ずれがないかを確認する。
同様にして全ての改良体１１に芯材１２を建て込む。
<2> Built-in core material.
The H steel of the core material 12 is built in the improved body 11 while the improved body 11 is uncured.
The core material 12 is checked for verticality and misalignment.
Similarly, the core material 12 is built in all the improved bodies 11.
＜３＞補強材の配置。
補強材１３を芯材１２の上方から吊り下ろして外挿し、改良体１１の頭部に埋設する。
補強材１３の内面と芯材１２の間に所定のクリアランスが確保できていることを確認する。
同様にして全ての改良体１１に補強材１３を埋設する。
なお、本例によらず、先に改良体１１内に補強材１３を埋設してからその内部に芯材１２を建て込む方法でもよい。
<3> Arrangement of reinforcing material.
The reinforcing material 13 is suspended from the upper side of the core material 12 and extrapolated, and embedded in the head of the improved body 11.
It is confirmed that a predetermined clearance is secured between the inner surface of the reinforcing material 13 and the core material 12.
Similarly, the reinforcing material 13 is embedded in all the improved bodies 11.
Instead of this example, a method may be used in which the reinforcing material 13 is first embedded in the improved body 11 and then the core material 12 is built therein.
＜４＞擁壁パネルの設置。
擁壁パネル２１を地盤上に吊り下ろす。
この際、擁壁パネル２１の連結孔２１ｃ内に芯材１２を挿通する。
設置後、擁壁パネル２１の水平確認及び鉛直確認と、連結孔２１ｃの内壁と芯材１２の間に所定のクリアランスが確保できていることを確認する。
<4> Installation of retaining wall panels.
The retaining
At this time, the core material 12 is inserted into the connection hole 21 c of the
After the installation, the horizontal confirmation and vertical confirmation of the
＜５＞充填材の充填。
連結孔２１ｃ内に充填材２２を充填して硬化させ、擁壁パネル２１を基礎構造１０と一体化させる。
<5> Filling with filler.
The connecting
＜６＞その後の工程。
所定の高さまで擁壁パネル２１を鉛直方向に積み上げる。
一箇所の積み上げが終わったら、隣の基礎構造１０に＜４＞＜５＞の作業を繰り返して擁壁パネル２１を連続し、壁面２０を構成する。
なお、本例では工程＜１＞〜＜３＞を擁壁の連続方向に沿って各工程まとめて行い、工程＜４＞＜５＞を基礎構造１０ごとに行ったが、これに限られない。
例えば、全ての工程を水平方向にまとめて行うなど、適宜手順を変更してもよい。
<6> Subsequent steps.
The
When the stacking of one place is completed, the work of <4><5> is repeated on the
In this example, the steps <1> to <3> are performed together along the continuous direction of the retaining wall, and the steps <4> and <5> are performed for each
For example, the procedure may be changed as appropriate, such as performing all steps in a horizontal direction.
[補強材に補強リブを設けた実施例]
本例では、外周に補強リブ１３ａを形成した補強材１３を採用する（図４）。
補強リブ１３ａは、補強材１３の外周にリング状又はらせん状に形成する。
補強リブ１３ａによって、補強材１３の管体が補強され、外圧に対する高い抵抗力を発揮することができる。
また、改良体１１との付着強度を向上して両者を強固に一体化することができる。
[Example in which reinforcing rib is provided on reinforcing material]
In this example, a reinforcing member 13 having reinforcing ribs 13a formed on the outer periphery is employed (FIG. 4).
The reinforcing rib 13a is formed in a ring shape or a spiral shape on the outer periphery of the reinforcing material 13.
The reinforcing rib 13a reinforces the tubular body of the reinforcing member 13 and can exhibit a high resistance against external pressure.
Moreover, the adhesive strength with the improved body 11 can be improved and both can be firmly integrated.
[補強材を芯材に連結した実施例]
本例では、芯材１２のフランジ面と補強材１３の内面との間を接続材１３ｂで接続し、両者を一体に連結する（図５）。
接続材１３ｂの形状や構造は問わないが、改良体１１の頭部より上方に付設することが望ましい。
補強材１３を芯材１２と一体構造にすることによって、芯材１２の建て込みと同時に補強材１３を埋設できるので、施工効率を高めることができる。
[Example in which reinforcing material is connected to core material]
In this example, the flange surface of the core member 12 and the inner surface of the reinforcing member 13 are connected by a connecting
The shape and structure of the connecting
By making the reinforcing member 13 integral with the core member 12, the reinforcing member 13 can be embedded at the same time as the core member 12 is built, so that the construction efficiency can be improved.
[補強材を改良体の上部に突出させた実施例]
本例では、補強材１３の上部を、改良体１１の上部から一部突出させる（図６）。
補強材１３の上部は最下段の擁壁パネル２１の連結孔２１ｃ内に入り、充填材２２によって擁壁パネル２１と一体化する。
これによって、基礎構造１０と壁面２０との一体性を強化し、自立式擁壁１の水平支持力をさらに向上させることができる。
[Example in which the reinforcing material protrudes from the top of the improved body]
In this example, the upper portion of the reinforcing member 13 is partially protruded from the upper portion of the improved body 11 (FIG. 6).
The upper portion of the reinforcing member 13 enters the connection hole 21 c of the lowermost
Thereby, the integrity of the
１ 自立式擁壁
１０ 基礎構造
１１ 改良体
１２ 芯材
１３ 補強材
１３ａ 補強リブ
１３ｂ 連結部
２０ 壁面
２１ 擁壁パネル
２１ａ パネル部
２１ｂ 控え部
２１ｃ 連結孔
２２ 充填材
DESCRIPTION OF SYMBOLS 1 Self-supporting
Claims (6)
地盤面から地中にわたって形成した改良体と、
下部を前記改良体内に同心状に配置した芯材と、
前記改良体の頭部において前記芯材の外周に同心状に配置した円筒状の補強材と、を備え、
前記芯材と前記補強材との間及び前記補強材の外側に前記改良体が延在し、
前記補強材を前記改良体の頭部にのみ配置し、
前記補強材の前記改良体内への埋設深さを選択することによって、擁壁の要求性能に応じた補強効果を任意に設定可能に構成したことを特徴とする、
基礎構造。 Retaining wall foundation structure,
An improved body formed from the ground surface to the ground,
A core material having a lower portion concentrically disposed within the improved body;
A cylindrical reinforcing material disposed concentrically on the outer periphery of the core material at the head of the improved body,
The improved body extends between the core material and the reinforcing material and outside the reinforcing material,
The reinforcing material is disposed only on the head of the improved body,
By selecting the embedding depth of the reinforcing material in the improved body, the reinforcing effect according to the required performance of the retaining wall can be arbitrarily set,
Foundation structure.
複数の前記芯材の上部で壁面を支持してなり、
前記壁面は、複数の矩形の擁壁パネルを鉛直方向及び水平方向に連続して構成したことを特徴とする、
自立式擁壁。 A self-supporting retaining wall using the foundation structure according to any one of claims 1 to 3,
A wall surface is supported by the upper part of the plurality of core members,
The wall surface is constituted by continuously forming a plurality of rectangular retaining wall panels in a vertical direction and a horizontal direction,
Free-standing retaining wall.
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| JPH11222870A (en) * | 1998-02-09 | 1999-08-17 | Modern Material:Kk | Fixing method of support for retaining wall block and guide member used for the same |
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| JP2001311169A (en) * | 2000-04-26 | 2001-11-09 | Modern Material:Kk | Block for earth retaining wall |
| JP2005325516A (en) * | 2004-05-12 | 2005-11-24 | Nittoc Constr Co Ltd | Earth retaining wall, its construction method and block for the earth retaining wall |
| JP2008057184A (en) * | 2006-08-30 | 2008-03-13 | Ps Mitsubishi Construction Co Ltd | Method of constructing underground wall by using h-shaped pc pile |
| KR20080077721A (en) * | 2007-02-21 | 2008-08-26 | 대명콘텍 주식회사 | The method of constructing bloclk for wall |
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2017
- 2017-12-14 JP JP2017239601A patent/JP6328312B1/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11181797A (en) * | 1997-12-18 | 1999-07-06 | Modern Material:Kk | Method for fixing support for retaining-wall block and foundation member for use therein |
| JPH11222870A (en) * | 1998-02-09 | 1999-08-17 | Modern Material:Kk | Fixing method of support for retaining wall block and guide member used for the same |
| JP2001311152A (en) * | 2000-04-26 | 2001-11-09 | Modern Material:Kk | Holding device for earth retaining wall support |
| JP2001311169A (en) * | 2000-04-26 | 2001-11-09 | Modern Material:Kk | Block for earth retaining wall |
| JP2005325516A (en) * | 2004-05-12 | 2005-11-24 | Nittoc Constr Co Ltd | Earth retaining wall, its construction method and block for the earth retaining wall |
| JP2008057184A (en) * | 2006-08-30 | 2008-03-13 | Ps Mitsubishi Construction Co Ltd | Method of constructing underground wall by using h-shaped pc pile |
| KR20080077721A (en) * | 2007-02-21 | 2008-08-26 | 대명콘텍 주식회사 | The method of constructing bloclk for wall |
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