JP2000303483A - Foundation structure - Google Patents

Foundation structure

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Publication number
JP2000303483A
JP2000303483A JP11115124A JP11512499A JP2000303483A JP 2000303483 A JP2000303483 A JP 2000303483A JP 11115124 A JP11115124 A JP 11115124A JP 11512499 A JP11512499 A JP 11512499A JP 2000303483 A JP2000303483 A JP 2000303483A
Authority
JP
Japan
Prior art keywords
pile
support
steel pipe
piles
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.)
Granted
Application number
JP11115124A
Other languages
Japanese (ja)
Other versions
JP3636924B2 (en
Inventor
Yasunari Miura
康成 三浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Penta Ocean Construction Co Ltd
Original Assignee
Penta Ocean Construction Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Penta Ocean Construction Co Ltd filed Critical Penta Ocean Construction Co Ltd
Priority to JP11512499A priority Critical patent/JP3636924B2/en
Publication of JP2000303483A publication Critical patent/JP2000303483A/en
Application granted granted Critical
Publication of JP3636924B2 publication Critical patent/JP3636924B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To lessen a bending moment to be generated in a support pile by a horizontal load by supporting a building erected on a soft ground by support piles connected to a foundatin slab with pins and filling a buffer material in between steel pipe piles driven so as to cover the upper outer periphery of the support piles and the support piles. SOLUTION: A building 2 erected on a soft ground has a structure in which a foundation slab 6 composed of a footing 4 and foundation beams 5 is supported by support piles 8 driven in the supporting ground 7. The support pile 8 is connected to the footing 4 with pins and is freely deformable around the part connected by the pin. Further, the outer periphery of the pile head 10 is protected by steel pipe piles 11 and a buffer material 12 is filled between the steel pipe piles 11 and the support piles 8. When a horizontal load acts due to an earthquake or the like, the support pile 8 is rotationally deformed around the pin-connection part in the steel pipe pile 11 and a bending moment brought in the pile head 10 is lessened. As a result, since a sear force acting on the foundation beam 5 is lessened as well, the sectional area of the foundation beam 5 can be decreased. Further, since the steel pipe pile 11 functions as a horizontal resistance pile, it resists a horizontal load and attenuate it.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は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 basic structure.

【0002】[0002]

【従来の技術】一般に軟弱地盤上に構築される鉄筋コン
クリート造などの建物は、図8に示すように、コンクリ
ート杭や鋼管杭などの杭17で支持されている。この杭
17は軟弱地盤18の下方に位置する支持地盤19にま
で打ち込まれて建物20の鉛直荷重を支持している。
2. Description of the Related Art A reinforced concrete building or the like generally constructed on soft ground is supported by a pile 17 such as a concrete pile or a steel pipe pile as shown in FIG. The pile 17 is driven into the supporting ground 19 located below the soft ground 18 to support the vertical load of the building 20.

【0003】[0003]

【発明が解決しようとする課題】しかし、上記のような
杭は鉛直荷重を支持しながら、地震などによる水平荷重
にも十分に耐えられるような大断面とするために非経済
的であった。
However, the above-mentioned pile is uneconomical because it has a large cross section capable of supporting a vertical load and sufficiently withstanding a horizontal load due to an earthquake or the like.

【0004】本発明は上記のような問題に鑑みてなされ
たものであり、その目的は、地盤上に構築される建物を
支持する杭の径を可能な限り小さくすることである。
The present invention has been made in view of the above problems, and an object of the present invention is to make the diameter of a pile supporting a building constructed on the ground as small as possible.

【0005】[0005]

【課題を解決するための手段】以上の課題を達成するた
めの手段は、請求項1の発明が、軟弱地盤上に構築され
た建物が基礎スラブとピン接合された支持杭で支持さ
れ、該支持杭の上部外周を覆うようにして鋼管杭が打設
され、該鋼管杭と支持杭との間には緩衝材が充填された
ことを特徴とする。
According to a first aspect of the present invention, a building constructed on soft ground is supported by a support stake which is pin-joined to a foundation slab. A steel pipe pile is cast so as to cover an upper outer periphery of the support pile, and a buffer material is filled between the steel pipe pile and the support pile.

【0006】請求項1の発明によれば、支持杭が基礎ス
ラブとピン接合されたことにより、地震などの水平荷重
により支持杭に発生する曲げモーメントを小さくするこ
とができる。また支持杭が軟弱地盤に拘束されずに鋼管
杭内において、ピン接合部を中心に回転変形して水平荷
重を減衰させる。また鋼管杭で支持杭の上部外周を保護
している。
According to the first aspect of the present invention, since the support pile is pin-joined to the foundation slab, the bending moment generated in the support pile due to a horizontal load such as an earthquake can be reduced. In addition, the support pile is not restrained by the soft ground, and rotationally deforms around the pin joint in the steel pipe pile to attenuate the horizontal load. In addition, steel pipe piles protect the upper periphery of the support piles.

【0007】また請求項2の発明が、請求項1におい
て、前記支持杭の周囲における基礎スラブに水平抵抗杭
が設けられたことを特徴とする。
A second aspect of the present invention is characterized in that, in the first aspect, a horizontal resistance pile is provided on a foundation slab around the support pile.

【0008】請求項2の発明によれば、水平抵抗杭が軟
弱地盤中を水平移動することによって発生する地盤反力
と地盤減衰を利用して地震エネルギーを消散させること
で、杭頭に作用する曲げモーメントを小さくすることが
できるので、支持杭の径を鉛直荷重だけが支持できる大
きさに縮小できる。また支持杭が軟弱地盤に拘束されず
にピン接合部を中心に回転変形することにより、水平抵
抗杭への水平力分担が効果的に行える。
According to the second aspect of the present invention, the horizontal resistance pile acts on the pile head by dissipating the seismic energy using the ground reaction force and the ground attenuation generated when the horizontal resistance pile moves horizontally in the soft ground. Since the bending moment can be reduced, the diameter of the support pile can be reduced to a size that can support only the vertical load. In addition, since the support pile is deformed around the pin joint without being restrained by the soft ground, the horizontal force can be effectively shared to the horizontal resistance pile.

【0009】また請求項3の発明が、請求項1または2
において、前記水平抵抗杭は緊張材によってプレストレ
ストが付与されたことを特徴とする。
The invention of claim 3 is the first or second invention.
Wherein the horizontal resistance pile is prestressed by a tendon material.

【0010】請求項3の発明によれば、水平抵抗杭にプ
レストレストが付与されて、ある程度の軸力が作用する
ことにより、水平抵抗杭の耐力が大きくなる。
According to the third aspect of the invention, the prestressed is applied to the horizontal resistance pile and a certain amount of axial force acts thereon, thereby increasing the strength of the horizontal resistance pile.

【0011】請求項4の発明が、請求項1〜3のいずれ
かにおいて、前記水平抵抗杭は断面円形または断面多角
形であることを特徴とする。
According to a fourth aspect of the present invention, in any one of the first to third aspects, the horizontal resistance pile has a circular cross section or a polygonal cross section.

【0012】請求項4の発明によれば、水平抵抗杭の断
面形状を建物の形状、地盤の性質に応じたものとするこ
とができる。
According to the fourth aspect of the present invention, the cross-sectional shape of the horizontal resistance pile can be adapted to the shape of the building and the properties of the ground.

【0013】また請求項5の発明が、請求項1〜4のい
ずれかにおいて、前記基礎スラブはフーチングと基礎梁
とからなることを特徴とする。
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the foundation slab includes a footing and a foundation beam.

【0014】請求項5の発明によれば、支持杭をピン接
合したことにより、杭頭に発生する曲げモーメントと、
基礎梁のせん断力とを小さくできるので、基礎梁の断面
を小さくすることができる。
According to the fifth aspect of the present invention, the bending moment generated at the pile head due to the pin connection of the supporting pile,
Since the shearing force of the foundation beam can be reduced, the cross section of the foundation beam can be reduced.

【0015】[0015]

【発明の実施の形態】以下、本発明における基礎構造の
実施の形態を図面に基づいて詳細に説明する。図1は第
1の実施の形態の基礎構造の断面図、図2は図1のA−
A線断面図、図3は要部の拡大断面図、図4は杭頭部の
拡大断面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the basic structure according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the basic structure according to the first embodiment, and FIG.
3 is an enlarged sectional view of a main part, and FIG. 4 is an enlarged sectional view of a pile head.

【0016】図1は、地盤改良をしていない軟弱地盤1
上に構築された建物2の基礎構造3を示し、フーチング
4と基礎梁5とからなる基礎スラブ6を支持地盤7に打
設された支持杭8で支持している。
FIG. 1 shows a soft ground 1 with no ground improvement.
1 shows a foundation structure 3 of a building 2 constructed above, in which a foundation slab 6 composed of a footing 4 and a foundation beam 5 is supported by a support pile 8 cast on a support ground 7.

【0017】支持杭8は現場打ち鉄筋コンクリート杭、
または既存の鉄筋コンクリート杭であり、図4に示すよ
うに、フーチング4にピン接合され、該ピン接合部9を
中心にして自由に回転変形できるようになっている。ま
た杭頭部10の外周は鋼管杭11で保護され、該鋼管杭
11と支持杭8との間には砂や弾性体などの緩衝材12
が充填されている。したがって、地震などの水平荷重に
より(以下水平荷重という)支持杭8がピン接合部9を
中心にして鋼管杭11内で回転変形することにより、杭
頭部10に発生する曲げモーメントが小さくなる。ま
た、前記鋼管杭11は水平抵抗杭ともなるため、水平荷
重にも抵抗する。
The supporting pile 8 is a cast-in-place reinforced concrete pile,
Or, it is an existing reinforced concrete pile, as shown in FIG. 4, which is pin-joined to the footing 4 so that it can be freely rotated and deformed around the pin joint 9. The outer periphery of the pile head 10 is protected by a steel pipe pile 11, and a cushioning material 12 such as sand or an elastic body is provided between the steel pipe pile 11 and the support pile 8.
Is filled. Therefore, the support pile 8 (hereinafter, referred to as a horizontal load) is rotationally deformed around the pin joint 9 in the steel pipe pile 11 by a horizontal load such as an earthquake, so that a bending moment generated in the pile head 10 is reduced. Further, since the steel pipe pile 11 also serves as a horizontal resistance pile, it also resists a horizontal load.

【0018】また、図5および図6は第2の実施の形態
の基礎構造13を示し、鋼管杭11の周囲のフーチング
4に水平抵抗杭14を設けたものであり、この水平抵抗
杭14を設けた他の構成は第1の実施の形態と同じであ
る。水平抵抗杭14は水平荷重に抵抗するものであり、
プレキャストコンクリートまたは現場打ちコンクリート
により軟弱地盤1中を水平移動できる長さに形成されて
いる。また水平抵抗杭14はフーチング4に限らず、基
礎スラブ6のいずれかに設けてもよい。
FIGS. 5 and 6 show a basic structure 13 according to the second embodiment, in which a horizontal resistance pile 14 is provided on a footing 4 around a steel pipe pile 11. Other configurations provided are the same as those of the first embodiment. The horizontal resistance pile 14 resists a horizontal load,
It is formed by precast concrete or cast-in-place concrete to a length that allows horizontal movement in the soft ground 1. The horizontal resistance pile 14 is not limited to the footing 4 and may be provided on any of the foundation slabs 6.

【0019】このように基礎構造13は軟弱地盤1を自
然の減衰材として利用することにより、水平荷重を減衰
しようとするものである。すなわち、水平抵抗杭14が
軟弱地盤1中を水平移動することによって発生する地盤
反力と、地盤減衰とを利用して水平荷重を低減するもの
である。これによって杭頭部10に作用する曲げモーメ
ントが小さくできるので、支持杭8の径を鉛直荷重だけ
が支持できる大きさに縮小できる。さらに、この曲げモ
ーメントが小さくなると、フーチング4に作用するせん
断力も小さくなるので、フーチング4自体も小さくする
ことができる。
As described above, the basic structure 13 is intended to attenuate a horizontal load by using the soft ground 1 as a natural damping material. That is, the horizontal load is reduced by utilizing the ground reaction force generated by the horizontal resistance pile 14 moving horizontally in the soft ground 1 and the ground attenuation. Since the bending moment acting on the pile head 10 can be reduced by this, the diameter of the support pile 8 can be reduced to a size that can support only the vertical load. Further, when the bending moment is reduced, the shearing force acting on the footing 4 is also reduced, so that the footing 4 itself can be reduced.

【0020】また支持杭8がピン接合部9を中心に回転
変形して水平荷重を減衰するが、この減衰効果は支持杭
8と鋼管杭11との間の緩衝材12によりさらに高めら
れる。したがって軟弱地盤1と、ピン接合の支持杭8
と、水平抵抗杭14とによって水平荷重に柔軟に対応す
ることができる基礎構造13となる。
The support pile 8 is rotated around the pin joint 9 to attenuate the horizontal load. The damping effect is further enhanced by the cushioning material 12 between the support pile 8 and the steel pipe pile 11. Accordingly, the soft ground 1 and the pin-supported support pile 8
And the horizontal resistance piles 14 to form the basic structure 13 capable of flexibly responding to a horizontal load.

【0021】図7は第3の実施の形態の基礎構造15を
示し、水平抵抗杭14にPC鋼線やPC鋼棒などの緊張
材16でプレストレストを付与したものであり、この点
を除いた他の構成は第2の実施の形態と同じである。
FIG. 7 shows a basic structure 15 according to a third embodiment, in which a horizontal resistance pile 14 is prestressed by a tension member 16 such as a PC steel wire or a PC steel bar, and this point is excluded. Other configurations are the same as those of the second embodiment.

【0022】なお、水平抵抗杭14は断面円形に限ら
ず、断面四角形、その他の多角形であってもよく、径、
長さ、本数および支持杭8との長さの比などは建物2の
大きさ、形状、構造形式あるいは地盤の性状などによっ
て決定する(図示せず)。
The horizontal resistance pile 14 is not limited to a circular cross section, but may be a rectangular cross section or another polygon.
The length, the number, the ratio of the length to the support pile 8 and the like are determined according to the size, shape, structure type, or property of the ground of the building 2 (not shown).

【0023】[0023]

【発明の効果】支持杭に作用する曲げモーメントを小さ
くすることにより、基礎梁に作用するせん断力も小さく
なるので、基礎梁の断面を小さくすることができる。
As the bending moment acting on the support pile is reduced, the shearing force acting on the foundation beam is also reduced, so that the cross section of the foundation beam can be reduced.

【0024】鋼管杭が水底抵抗杭ともなるため、水平荷
重にも抵抗して減衰させることができる。
Since the steel pipe pile also serves as a water bottom resistance pile, it can be attenuated by resisting even a horizontal load.

【0025】軟弱地盤に拘束されない支持杭が、鋼管杭
内においてピン接合部を中心に回転変形して水平荷重を
減衰させるとともに、この減衰効果が緩衝材でさらに高
められる。
The support pile not restrained by the soft ground rotates and deforms around the pin joint in the steel pipe pile to attenuate the horizontal load, and the damping effect is further enhanced by the cushioning material.

【0026】支持杭の上部外周を鋼管杭で保護すること
ができる。
The upper periphery of the support pile can be protected by a steel pipe pile.

【0027】水平抵抗杭が軟弱地盤中を水平移動して発
生する地盤反力と地盤減衰とを利用して地震エネルギー
を消散させることで、杭頭に発生する曲げモーメントを
小さくできるので、支持杭の径を鉛直荷重だけが支持で
きる大きさに縮小できる。また、支持杭が軟弱地盤に拘
束されず鋼管杭内でピン接合部を中心に回転変形するこ
とにより、水平抵抗杭への水平力分担が効果的に行え
る。
The bending moment generated at the pile head can be reduced by dissipating the seismic energy by using the ground reaction force and the ground attenuation generated by the horizontal resistance pile moving horizontally in the soft ground, so that the supporting pile can be reduced. Can be reduced to a size that can support only a vertical load. In addition, since the supporting pile is not restricted by the soft ground and is rotated around the pin joint in the steel pipe pile, horizontal force can be effectively shared to the horizontal resistance pile.

【0028】水平抵抗杭にプレストレストが付与され
て、ある程度の軸力が作用することにより、水平抵抗杭
の耐力を大きくすることができる。
The prestressing is applied to the horizontal resistance pile, and a certain amount of axial force acts thereon, so that the strength of the horizontal resistance pile can be increased.

【0029】水平抵抗杭の断面形状を建物の形状、地盤
の性質に応じたものとすることができる。
The cross-sectional shape of the horizontal resistance pile can be adapted to the shape of the building and the properties of the ground.

【0030】軟弱地盤を自然の減衰材として利用するこ
とにより、地盤改良などの手間が省け工期の短縮および
工費の低減を図ることができる。
By using the soft ground as a natural damping material, it is possible to save time and effort for improving the ground, thereby shortening the construction period and reducing the construction cost.

【0031】軟弱地盤を自然の減衰材として利用するこ
とにより、水平荷重を効果的に減衰できる。
By using the soft ground as a natural damping material, the horizontal load can be effectively damped.

【図面の簡単な説明】[Brief description of the drawings]

【図1】基礎構造の断面図である。FIG. 1 is a sectional view of a basic structure.

【図2】図1のA−A線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.

【図3】基礎構造の要部の拡大断面図である。FIG. 3 is an enlarged sectional view of a main part of the basic structure.

【図4】(1)は杭頭部の拡大断面図、(2)は(1)
のBーB線断面図である。
FIG. 4 (1) is an enlarged sectional view of a pile head, and (2) is (1).
FIG. 3 is a sectional view taken along line BB of FIG.

【図5】第2の実施の形態の基礎構造の断面図である。FIG. 5 is a sectional view of a basic structure according to a second embodiment.

【図6】(1)は杭頭部の拡大断面図、(2)は(1)
のCーC線断面図である。
FIG. 6 (1) is an enlarged sectional view of a pile head, and (2) is (1).
It is CC sectional view taken on the line of FIG.

【図7】第3の実施の形態の基礎構造における杭頭部の
拡大断面図である。
FIG. 7 is an enlarged sectional view of a pile head in a foundation structure according to a third embodiment.

【図8】従来の基礎構造の断面図である。FIG. 8 is a sectional view of a conventional basic structure.

【符号の説明】[Explanation of symbols]

1、18 軟弱地盤 2、20 建物 3、13、15 基礎構造 4 フーチング 5 基礎梁 6 基礎スラブ 7、19 支持地盤 8 支持杭 9 ピン接合部 10 杭頭部 11 鋼管杭 12 緩衝材 13 基礎構造 14 水平抵抗杭 16 緊張材 17 杭 1,18 Soft ground 2,20 Building 3,13,15 Foundation structure 4 Footing 5 Foundation beam 6 Foundation slab 7,19 Support ground 8 Support pile 9 Pin joint 10 Pile head 11 Steel pipe pile 12 Buffer material 13 Foundation structure 14 Horizontal resistance pile 16 Tensile material 17 pile

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 軟弱地盤上に構築された建物が基礎スラ
ブとピン接合された支持杭で支持され、該支持杭の上部
外周を覆うようにして鋼管杭が打設され、該鋼管杭と支
持杭との間には緩衝材が充填されたことを特徴とする基
礎構造。
1. A building constructed on soft ground is supported by a support pile that is pin-joined to a foundation slab, and a steel pipe pile is cast so as to cover an upper outer periphery of the support pile. A basic structure characterized by filling cushioning material between the piles.
【請求項2】 前記支持杭の周囲における基礎スラブに
水平抵抗杭が設けられたことを特徴とする請求項1に記
載の基礎構造。
2. The foundation structure according to claim 1, wherein a horizontal resistance pile is provided on the foundation slab around the support pile.
【請求項3】 前記水平抵抗杭は緊張材によってプレス
トレストが付与されたことを特徴とする請求項1または
2に記載の基礎構造。
3. The foundation structure according to claim 1, wherein the horizontal resistance pile is prestressed by a tendon material.
【請求項4】 前記水平抵抗杭は断面円形または断面多
角形であることを特徴とする請求項1〜3のいずれかに
記載の基礎構造。
4. The foundation structure according to claim 1, wherein the horizontal resistance pile has a circular cross section or a polygonal cross section.
【請求項5】 前記基礎スラブはフーチングと基礎梁と
からなることを特徴とする請求項1〜4のいずれかに記
載の基礎構造。
5. The foundation structure according to claim 1, wherein said foundation slab comprises a footing and a foundation beam.
JP11512499A 1999-04-22 1999-04-22 Foundation structure Expired - Fee Related JP3636924B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11512499A JP3636924B2 (en) 1999-04-22 1999-04-22 Foundation structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11512499A JP3636924B2 (en) 1999-04-22 1999-04-22 Foundation structure

Publications (2)

Publication Number Publication Date
JP2000303483A true JP2000303483A (en) 2000-10-31
JP3636924B2 JP3636924B2 (en) 2005-04-06

Family

ID=14654868

Family Applications (1)

Application Number Title Priority Date Filing Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013002076A (en) * 2011-06-14 2013-01-07 Taisei Corp Pile foundation structure
JP2014227736A (en) * 2013-05-23 2014-12-08 株式会社大林組 Pile foundation structure and method for constructing pile foundation structure
CN104264726A (en) * 2014-09-29 2015-01-07 中铁十六局集团北京轨道交通工程建设有限公司 Construction method for preventing pile foundation settlement when shield side penetrates pile foundation
JP2019073884A (en) * 2017-10-16 2019-05-16 東日本旅客鉄道株式会社 Vibration displacement suppressing structure of structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013002076A (en) * 2011-06-14 2013-01-07 Taisei Corp Pile foundation structure
JP2014227736A (en) * 2013-05-23 2014-12-08 株式会社大林組 Pile foundation structure and method for constructing pile foundation structure
CN104264726A (en) * 2014-09-29 2015-01-07 中铁十六局集团北京轨道交通工程建设有限公司 Construction method for preventing pile foundation settlement when shield side penetrates pile foundation
JP2019073884A (en) * 2017-10-16 2019-05-16 東日本旅客鉄道株式会社 Vibration displacement suppressing structure of structure

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