JP2000120081A - Slope footing structure - Google Patents
Slope footing structureInfo
- Publication number
- JP2000120081A JP2000120081A JP10296485A JP29648598A JP2000120081A JP 2000120081 A JP2000120081 A JP 2000120081A JP 10296485 A JP10296485 A JP 10296485A JP 29648598 A JP29648598 A JP 29648598A JP 2000120081 A JP2000120081 A JP 2000120081A
- Authority
- JP
- Japan
- Prior art keywords
- slope
- footing
- excavation
- support layer
- foundation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Foundations (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、橋梁やその他構造
物において直接基礎を斜面に構築する場合に適用される
斜面基礎構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope foundation structure applied when a foundation is directly constructed on a slope in a bridge or other structures.
【０００２】[0002]
【従来の技術】橋脚の直接基礎を斜面に構築する場合、
従来においては、図３に示すような段基礎構造５０が採
用されている。この段基礎構造５０では、フーチング５
１の側面視形状を斜面に沿った階段形状とし、通常の水
平な底面を持つフーチングと比べて掘削量を低減すると
共に、フーチング底面の水平部分５１ａを極力確保する
ことで支持力の低下を抑えている。2. Description of the Related Art When building a direct foundation of a pier on a slope,
Conventionally, a step foundation structure 50 as shown in FIG. 3 is employed. In this step foundation structure 50, the footing 5
The side view shape of Step 1 is a stepped shape along the slope, which reduces the amount of excavation compared to a footing with a normal horizontal bottom surface, and reduces the supporting force by securing the horizontal portion 51a of the footing bottom surface as much as possible. ing.
【０００３】施工に際しては、橋脚の設置箇所の斜面Ａ
を斜面傾斜方向の所定長さ範囲にわたって階段状に掘削
し、支持層Ｂ内の橋脚設置箇所に基礎底面の処理工５２
を行った後、フーチング鉄筋を配置しコンクリートを打
設してフーチング５１を構築する。その後、フーチング
５１の周辺の埋戻しや掘削法面の保護工等を行う。[0003] In the construction, the slope A
Is excavated in a stepwise manner over a predetermined length range in the slope inclining direction.
After that, the footing 51 is constructed by arranging the footing rebar and casting concrete. After that, backfilling around the footing 51 and protection of the excavation slope are performed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
段基礎構造では、フーチングが階段状で厚み寸法が大き
いため、斜面の掘削範囲が斜面傾斜方向に広くなり、コ
ストがかかる、自然環境へ影響を与えるなどの問題点が
あった。However, in the conventional step foundation structure, since the footing is stepwise and has a large thickness, the excavation area of the slope is widened in the slope inclination direction, which increases the cost and affects the natural environment. There were problems such as giving.
【０００５】本発明は、前述のような問題点を解消すべ
くなされたもので、その目的は、斜面の掘削範囲および
掘削量を大幅に低減でき、コストを低減し、自然環境へ
の影響を最小限に抑えることのできる斜面基礎構造を提
供することにある。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to significantly reduce the excavation range and amount of excavation on a slope, reduce costs, and reduce the impact on the natural environment. It is to provide a slope foundation that can be minimized.
【０００６】[0006]
【課題を解決するための手段】本発明の斜面基礎構造
は、斜面に構築される直接基礎であり、斜面の支持層と
ほぼ平行に支持層に打設される基礎コンクリート（フー
チング）と、この基礎コンクリートから支持層内に打設
されるアンカー（アースアンカー）とからなることを特
徴とする。The slope foundation structure according to the present invention is a direct foundation constructed on a slope, and a foundation concrete (footing) cast on a support layer substantially in parallel with the support layer on the slope. An anchor (earth anchor) cast into the support layer from the foundation concrete.
【０００７】以上のような構成において、橋脚等の設置
位置を掘削した後、露出した支持層面から支持地盤中に
アンカーを打設・緊張した後、鉄筋を配筋しコンクリー
トを打設してフーチングを構築する。あるいは、支持層
面にフーチングを構築した後、このフーチングの表面か
ら支持地盤中にアンカーを打設・緊張する。[0007] In the above configuration, after excavating the installation position of a pier or the like, an anchor is driven into the supporting ground from the exposed support layer surface, and then reinforcing bars are laid and concrete is driven to footing. To build. Alternatively, after a footing is constructed on the surface of the support layer, an anchor is placed and tensioned in the support ground from the surface of the footing.
【０００８】フーチングを斜面の支持層とほぼ平行に支
持層上に構築することができ、またフーチングの厚さを
薄くすることができるため、フーチング底面の深さが浅
くなり、斜面の掘削範囲および掘削量を従来の段基礎構
造と比較して大幅に減少させることができ、コストの低
減を図れ、自然環境への影響を最小限とすることができ
る。また、フーチングが平板状で傾斜して構築されるこ
とで基礎の安定性の安全率が減少するが、フーチングか
ら斜めに打設したアンカーの引抜き抵抗力により基礎の
安定性（鉛直支持・水平支持（滑動抵抗）・転倒）が確
保される。The footing can be constructed on the support layer substantially parallel to the support layer on the slope, and the thickness of the footing can be reduced. The amount of excavation can be greatly reduced as compared with the conventional step foundation structure, so that the cost can be reduced and the influence on the natural environment can be minimized. In addition, the safety factor of the stability of the foundation decreases because the footing is constructed flat and inclined, but the stability of the foundation (vertical support / horizontal support) is reduced by the pull-out resistance of the anchor installed obliquely from the footing. (Sliding resistance) and falling) are secured.
【０００９】[0009]
【発明の実施の形態】以下、本発明を図示する実施の形
態に基づいて説明する。図１は、本発明の斜面基礎構造
を橋梁の橋脚の直接基礎に適用した例を示したものであ
る。図２は斜面の掘削範囲を本発明の斜面基礎構造と従
来の段基礎構造とで比較したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 shows an example in which the slope foundation structure of the present invention is applied to a direct foundation of a bridge pier. FIG. 2 compares the excavation range of the slope between the slope foundation structure of the present invention and the conventional step foundation structure.
【００１０】図１において、本発明の斜面基礎構造１
は、斜面Ａの支持層Ｂとほぼ平行な上面２ａおよび底面
２ｂを有する側面視で偏平の略平行四辺形状で支持層Ｂ
とほぼ平行に構築される基礎コンクリート（フーチン
グ）２と、このフーチング２から支持層Ｂの内部へ斜め
に打設される複数のアースアンカー３から構成される。In FIG. 1, a slope basic structure 1 of the present invention is shown.
Is a substantially parallelogram-shaped support layer B having a top surface 2a and a bottom surface 2b which are substantially parallel to the support layer B on the slope A and which is flat in side view.
And a plurality of earth anchors 3 which are obliquely cast from the footing 2 into the inside of the support layer B.
【００１１】フーチング２の下半分程度が支持層Ｂ内に
埋設されるように、斜面Ａの橋脚設置箇所を斜面傾斜方
向の所定の長さ範囲にわたって階段状に掘削し、後述す
るようにコンクリートを打設してフーチング２を構築す
る。フーチング２の底面２ｂは殆どを傾斜面として大部
分のアースアンカー３を支持層Ｂと交差するように打設
できるようにし、その上部または下部、あるいは上部お
よび下部に水平面２ｃを設ける。In order to bury the lower half of the footing 2 in the support layer B, the place where the pier is installed on the slope A is excavated in a stepwise manner over a predetermined length range in the slope inclining direction. The footing 2 is constructed by casting. Most of the bottom surface 2b of the footing 2 is an inclined surface so that most of the earth anchors 3 can be driven so as to intersect with the support layer B, and a horizontal plane 2c is provided on the upper or lower part, or on the upper and lower parts.
【００１２】以上のようなフーチング２では、鉛直支持
・水平支持（滑動抵抗）・転倒に対して安定性が減少す
るため、斜めに打設したアースアンカー３の引抜き抵抗
力により安定性を確保する。このアースアンカー３は、
例えば、フーチング２の底面２ｂに配設される多数のア
ースアンカー３−１と、フーチング２の上部に配設され
るアースアンカー３−２から構成する。中央のアースア
ンカー３ー１は、その分力で主に鉛直支持力と水平支持
力が得られるようにし、さらに上部のアースアンカー３
−２は、転倒モーメントにも有効に対抗できるようにす
る。In the footing 2 as described above, stability is reduced with respect to vertical support, horizontal support (sliding resistance), and overturning. Therefore, stability is secured by the pull-out resistance of the earth anchor 3 that is obliquely installed. . This earth anchor 3
For example, the footing 2 includes a large number of ground anchors 3-1 disposed on the bottom surface 2b and a ground anchor 3-2 disposed on the top of the footing 2. The earth anchor 3-1 at the center allows the vertical support force and the horizontal support force to be mainly obtained by the component force.
-2 makes it possible to effectively counter the falling moment.
【００１３】以上のような構成の斜面基礎構造１におい
て、例えば、次に示すような手順で施工を行う。 (1) 斜面Ａの橋脚設置位置を中心として斜面傾斜方向の
所定の長さ範囲にわたって堆積土・表土等の弱い土層お
よび支持層Ｂを掘削し、階段状で良好な支持層Ｂが露出
した設置凹部を形成する。In the slope foundation structure 1 having the above-described configuration, the construction is performed in the following procedure, for example. (1) Excavation of a weak soil layer such as sedimentary soil and topsoil and a support layer B over a predetermined length range in the slope incline direction centering on the pier installation position of the slope A, and a good support layer B in a stepwise manner was exposed. An installation recess is formed.
【００１４】(2) 直接基礎の設置箇所の露出した支持層
面から支持地盤中にアースアンカー３を打設して緊張す
る。アースアンカー３の先端部はモルタル等で固定し、
頭部はフーチングコンクリート中に定着するような構造
あるいは長さを有するものとする。(2) An earth anchor 3 is placed directly into the support ground from the exposed support layer surface at the place where the foundation is installed, and tension is applied. The tip of the earth anchor 3 is fixed with mortar etc.
The head should have a structure or length that will settle in the footing concrete.
【００１５】(3) アースアンカー３が打設された支持層
面上にフーチング鉄筋を配筋し、フーチングコンクリー
トを打設し、フーチング２を構築する。その後、フーチ
ング２の周辺の埋戻しや掘削法面の保護工等を行う。(3) A footing rebar is arranged on the support layer surface on which the earth anchor 3 is cast, and footing concrete is cast to construct the footing 2. After that, backfilling around the footing 2 and protection work for the excavation slope are performed.
【００１６】あるいは、 (1) 斜面Ａの橋脚設置位置を中心とする所定の長さ範囲
にわたって堆積土・表土等の弱い土層および支持層Ｂを
掘削し、階段状で良好な支持層Ｂが露出した設置凹部を
形成する。Alternatively, (1) Excavation of a weak soil layer such as sedimentary soil and topsoil and a supporting layer B over a predetermined length range centered on the pier installation position of the slope A, and a good stair-like supporting layer B is formed. An exposed installation recess is formed.
【００１７】(2) 直接基礎の設置箇所の露出した支持層
面上にフーチング鉄筋を配筋し、フーチングコンクリー
トを打設し、フーチング２を構築する。 (3) フーチング２の上面２ａからフーチング２を貫通し
て支持地盤中にアースアースアンカー３を打設して緊張
する。アースアンカー３の先端部はモルタル等で固定
し、頭部は通常用いられるナット等の定着手段により定
着させる。その後、フーチング２の周辺の埋戻しや掘削
法面の保護工等を行う。(2) A footing reinforcing bar is arranged on the exposed support layer surface at the place where the foundation is directly installed, and a footing concrete is cast to construct a footing 2. (3) The earthing anchor 3 is pierced from the upper surface 2a of the footing 2 into the supporting ground through the footing 2 and tensioned. The tip of the earth anchor 3 is fixed with mortar or the like, and the head is fixed with fixing means such as a commonly used nut. After that, backfilling around the footing 2 and protection work for the excavation slope are performed.
【００１８】以上のような斜面基礎構造の場合、フーチ
ング２が斜面の支持層Ｂとほぼ平行に支持層上に構築す
ることができ、またフーチング２の厚さを薄くすること
ができるため、フーチング２の底面の深さが浅くなり、
従来の段基礎構造と比較して図２の斜線部分だけ掘削面
積を減少させることができる。In the case of the above-described slope basic structure, the footing 2 can be constructed on the support layer almost in parallel with the support layer B on the slope, and the footing 2 can be reduced in thickness. The depth of the bottom of 2 becomes shallower,
As compared with the conventional step foundation structure, the excavation area can be reduced only in the hatched portion in FIG.
【００１９】なお、以上は橋脚の直接基礎について説明
したが、これに限らず、斜面に構築される鉄塔やその他
の構造物の直接基礎にも本発明を適用できることはいう
までもない。The direct foundation of the pier has been described above. However, it is needless to say that the present invention is not limited to this and can be applied to the direct foundation of a steel tower or other structures constructed on a slope.
【００２０】[0020]
【発明の効果】前述のとおり、本発明は、斜面の支持層
とほぼ平行に支持層に打設される基礎コンクリートと、
この基礎コンクリートから支持層内に打設されるアンカ
ーとから斜面基礎構造を構成するようにしたため、厚み
の薄い基礎コンクリートを斜面の支持層と平行に構築す
ることができ、斜面の掘削範囲および掘削量を従来の段
基礎構造と比較して大幅に低減でき、コストを低減し、
自然環境への影響を最小限に抑えることができる。As described above, the present invention relates to a foundation concrete cast on a support layer substantially parallel to a slope support layer,
Since the slope foundation structure is composed of the foundation concrete and the anchors cast in the support layer, the thin foundation concrete can be constructed in parallel with the slope support layer, and the slope excavation area and excavation can be performed. The volume can be significantly reduced compared to the conventional step foundation structure, reducing costs,
The impact on the natural environment can be minimized.
【図１】本発明の斜面基礎構造を橋脚の直接基礎に適用
した例を示す側面断面図である。FIG. 1 is a side sectional view showing an example in which a slope foundation structure of the present invention is applied to a direct foundation of a pier.
【図２】本発明の斜面基礎構造と従来の段基礎構造にお
ける掘削面積を比較した側面断面図である。FIG. 2 is a side sectional view comparing the excavated area of the slope foundation structure of the present invention and the conventional step foundation structure.
【図３】従来の橋脚における段基礎構造を示す側面断面
図である。FIG. 3 is a side sectional view showing a step foundation structure in a conventional pier.
Ａ……斜面 Ｂ……支持層 １……斜面基礎構造 ２……フーチング（基礎コンクリート） ２ａ…上面 ２ｂ…底面 ２ｃ…水平面 ３……アースアンカー A: slope B: support layer 1: slope basic structure 2: footing (foundation concrete) 2a: top surface 2b: bottom surface 2c: horizontal surface 3: earth anchor
Claims (1)
の支持層とほぼ平行に支持層に打設される基礎コンクリ
ートと、この基礎コンクリートから支持層内に打設され
るアンカーとからなることを特徴とする斜面基礎構造。1. A direct foundation constructed on a slope, comprising a foundation concrete cast on the support layer substantially parallel to the support layer on the slope, and an anchor cast from the foundation concrete into the support layer. Slope foundation structure characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10296485A JP2000120081A (en) | 1998-10-19 | 1998-10-19 | Slope footing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10296485A JP2000120081A (en) | 1998-10-19 | 1998-10-19 | Slope footing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000120081A true JP2000120081A (en) | 2000-04-25 |
Family
ID=17834176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10296485A Withdrawn JP2000120081A (en) | 1998-10-19 | 1998-10-19 | Slope footing structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000120081A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006348526A (en) * | 2005-06-14 | 2006-12-28 | Railway Technical Res Inst | Composite pile foundation structure and pile foundation type support method of structure |
| KR100846094B1 (en) * | 2007-01-29 | 2008-07-14 | (주)내경엔지니어링 | Abutment structure and the construction method of this for mountains area installation with slope |
| JP2009001998A (en) * | 2007-06-20 | 2009-01-08 | R C Koa:Kk | Mat foundation for slope land |
| KR101139466B1 (en) | 2011-09-08 | 2012-04-30 | 주식회사 한국종합기술 | Construction method of foundation of bridge |
| KR101140787B1 (en) | 2008-12-17 | 2012-05-03 | 주식회사 바우 컨설탄트 | Bridge post foundation construction method |
| JP2015117466A (en) * | 2013-12-16 | 2015-06-25 | 大成建設株式会社 | Support structure |
| CN108755698A (en) * | 2018-05-25 | 2018-11-06 | 中铁建大桥工程局集团第工程有限公司 | A kind of big inclined rock base foundation construction method of abrupt slope incompact-deposit bodies |
| KR20210047481A (en) * | 2019-10-22 | 2021-04-30 | 김상훈 | Core wall structure of composite cassion for offshore runway |
-
1998
- 1998-10-19 JP JP10296485A patent/JP2000120081A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006348526A (en) * | 2005-06-14 | 2006-12-28 | Railway Technical Res Inst | Composite pile foundation structure and pile foundation type support method of structure |
| KR100846094B1 (en) * | 2007-01-29 | 2008-07-14 | (주)내경엔지니어링 | Abutment structure and the construction method of this for mountains area installation with slope |
| JP2009001998A (en) * | 2007-06-20 | 2009-01-08 | R C Koa:Kk | Mat foundation for slope land |
| KR101140787B1 (en) | 2008-12-17 | 2012-05-03 | 주식회사 바우 컨설탄트 | Bridge post foundation construction method |
| KR101139466B1 (en) | 2011-09-08 | 2012-04-30 | 주식회사 한국종합기술 | Construction method of foundation of bridge |
| JP2015117466A (en) * | 2013-12-16 | 2015-06-25 | 大成建設株式会社 | Support structure |
| CN108755698A (en) * | 2018-05-25 | 2018-11-06 | 中铁建大桥工程局集团第工程有限公司 | A kind of big inclined rock base foundation construction method of abrupt slope incompact-deposit bodies |
| CN108755698B (en) * | 2018-05-25 | 2020-01-10 | 中铁建大桥工程局集团第一工程有限公司 | Construction method for steep slope loose accumulation body large inclined rock surface foundation |
| KR20210047481A (en) * | 2019-10-22 | 2021-04-30 | 김상훈 | Core wall structure of composite cassion for offshore runway |
| KR102294870B1 (en) * | 2019-10-22 | 2021-08-26 | 김상훈 | Core wall structure of composite cassion for offshore runway |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060110 |