JP2007039938A - Foundation structure of building - Google Patents

Foundation structure of building Download PDF

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Publication number
JP2007039938A
JP2007039938A JP2005224006A JP2005224006A JP2007039938A JP 2007039938 A JP2007039938 A JP 2007039938A JP 2005224006 A JP2005224006 A JP 2005224006A JP 2005224006 A JP2005224006 A JP 2005224006A JP 2007039938 A JP2007039938 A JP 2007039938A
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pile
foundation
building
small cross
foundation structure
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JP2005224006A
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Japanese (ja)
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Naokuni Endo
直邦 遠藤
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Toda Corp
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Toda Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation structure of a building capable of exhibiting the vibration damping effect while reducing rotational restriction (a pile head fixing degree) by reducing joining of a foundation and a pile. <P>SOLUTION: This foundation structure 1 is characterized in that the pile 5 having a pile head part 8 embedded in the foundation 6 of the building is joined via a shock absorbing material 7, and the shock absorbing material 7 is composed of a vertical part 10 covering the embedding part outer periphery 9 of the pile embedded in the foundation 6 and a horizontal part 13 having the same diameter as a pile upper surface 11 and opening a hole 12 in a central part, and the pile 5 and the foundation 6 contact by a small cross-sectional part 14 of the hole 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本願発明は建物の基礎構造に関するものである。   The present invention relates to a basic structure of a building.

従来、基礎と杭とは剛接合するために現場打ちコンクリート杭や既製杭であっても、図5に示すように、杭頭部18を基礎19に100mm以上埋め込んで、杭の主筋20を基礎19に定着していた。しかし、杭頭部18が基礎19に剛接合されると地震などの水平力を受けた場合に、杭頭部18や基礎梁21などに生じる応力が大きくなるため、部材の補強を過大にしなければならないという問題があった。このような問題を解決するために、図6に示すように、杭頭部22にテーパ23を付けたり、小断面部材24を挟んだりする構造が提案されている。また、その他の建物の基礎構造としては、例えば特開2001−32296号の発明が知られている。
特開2001−32296号公報
Conventionally, even if it is a cast-in-place concrete pile or a ready-made pile, since the foundation and the pile are rigidly joined, as shown in FIG. 19 was established. However, when the pile head 18 is rigidly joined to the foundation 19, when a horizontal force such as an earthquake is applied, the stress generated in the pile head 18, the foundation beam 21, and the like increases, so the reinforcement of the members must be excessive. There was a problem that had to be done. In order to solve such a problem, as shown in FIG. 6, a structure in which a taper 23 is attached to the pile head 22 or a small cross-sectional member 24 is sandwiched is proposed. In addition, as a basic structure of other buildings, for example, the invention of JP-A-2001-32296 is known.
JP 2001-32296 A

しかし、上記のテーパを付けた構造は、水平変形が杭頭固定よりも増大するため、建物の移動や傾きが大きくなって地震後も残留変形が残るという問題があった。また小断面部材を挟んだ構造は、回転拘束のみを低減させているため、杭頭部のエネルギー吸収性能が小さく、地震時に上部構造の揺れが大きくなる場合があった。   However, the tapered structure described above has a problem that the horizontal deformation increases more than the pile head fixing, so that the movement and inclination of the building become large and residual deformation remains after the earthquake. Moreover, since the structure which pinched | interposed the small cross-section member reduced only rotation restraint, the energy absorption performance of the pile head was small, and the shaking of the superstructure might become large at the time of an earthquake.

本願発明はこれらの問題に鑑みてなされたものであり、その目的は、基礎と杭との接合を低減させて回転拘束を小さくするとともに、制振効果を発揮することができる建物の基礎構造を提供することである。   The present invention has been made in view of these problems, and its purpose is to reduce the rotation restraint by reducing the bonding between the foundation and the pile, and to provide a foundation structure of the building that can exhibit a damping effect. Is to provide.

以上の課題を解決するための建物の基礎構造は、杭頭部が建物の基礎に埋設された杭が緩衝材を介して接合され、該緩衝材は基礎に埋設された杭の埋設部外周を覆う垂直部と、杭上面と同径でかつ中央部に孔が開口された水平部とから構成され、前記孔の小断面部により杭と基礎とが接していることを特徴とする。また孔の小断面部に杭と基礎とにわたる軸鉄筋が配筋されたことを含むものである。   The foundation structure of the building for solving the above problems is that the pile head is buried in the foundation of the building and the pile is joined via a cushioning material, and the cushioning material is attached to the outer periphery of the buried part of the pile buried in the foundation. It is comprised from the vertical part to cover and the horizontal part which is the same diameter as the pile upper surface, and the hole was opened in the center part, and the pile and the foundation have contact | connected by the small cross-sectional part of the said hole. It also includes the fact that the shaft reinforcing bar that extends between the pile and the foundation is arranged in the small cross section of the hole.

基礎と杭とが小断面部で接しているため、これらの施工が容易にできる。また小断面部によって基礎と杭との接合を低減させて回転拘束を小さくする杭頭固定度を調整することができるとともに、緩衝材の材質と大きさで制振効果を調整することができるので設計の自由度を高くすることができる。また水平力による水平変形に拘わらず杭頭固定度の変動が小さいので、経済設計が可能で、耐震性能が安定している。また緩衝材の弾性反発性能で震災後の原点復帰性能が高まり残留変形が減少する。また水平方向および上下方向に制振効果があり、建物の水平変形の現象だけでなく、建物の水平・上下振動も低減する。   Since the foundation and the pile are in contact with each other with a small cross section, these constructions can be easily performed. In addition, it is possible to adjust the pile head fixing degree that reduces the rotation restraint by reducing the joint between the foundation and the pile by the small cross section, and the damping effect can be adjusted by the material and size of the cushioning material The degree of freedom in design can be increased. Moreover, because the fluctuation of pile head fixing degree is small regardless of horizontal deformation due to horizontal force, economic design is possible and the seismic performance is stable. In addition, the resilience performance of the cushioning material increases the return-to-origin performance after the earthquake and reduces residual deformation. It also has a vibration control effect in the horizontal and vertical directions, reducing not only the phenomenon of horizontal deformation of the building, but also the horizontal and vertical vibration of the building.

以下、本願発明の建物の基礎構造の実施の形態を図面に基づいて説明する。図1は第1の実施の形態の建物の基礎構造(以下、基礎構造という)を示すものであり、本願発明の基礎構造1は杭頭固定度を、図3に示すように、ピン接合の基礎構造2と剛接合の基礎構造3との間に位置するようにするものである。この杭頭固定度とは、基礎と杭との接合を低減させて回転拘束を小さくする度合をいう。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a building foundation structure according to the present invention will be described with reference to the drawings. FIG. 1 shows the basic structure of a building according to the first embodiment (hereinafter referred to as a basic structure). The basic structure 1 of the present invention is a pin joint fixing degree as shown in FIG. It is located between the base structure 2 and the rigidly connected base structure 3. This pile head fixing degree refers to the degree to which the joint between the foundation and the pile is reduced to reduce the rotation constraint.

この基礎構造1は地盤4に打設された杭5がコンクリート基礎6に緩衝材7を介して接合されて構成されている。この杭5はコンクリート製の既製杭、場所打ちコンクリート杭あるいは場所打ち鋼管コンクリート杭であり、杭頭部8をコンクリート基礎6内にわずかに埋設させて接合され、これらの間に設置された緩衝材7がコンクリート基礎6に埋設された埋設部外周9を覆う垂直部10と、杭上面11を覆う杭と同径でかつ中央部に孔12が開口された水平部13とから構成され、前記孔12に形成された小断面部14のみでコンクリート基礎6と接している。この緩衝材7は弾性反発性能または、覆歴減衰や粘性減衰等のエネルギー吸収性能を有する粘弾性材、高分子材、高減衰ゴム、ゴム、アスファルトピッチ、鉛などで構成されている。   This foundation structure 1 is constituted by a pile 5 placed on the ground 4 being joined to a concrete foundation 6 via a buffer material 7. This pile 5 is a ready-made pile made of concrete, a cast-in-place concrete pile or a cast-in-place steel pipe concrete pile. 7 is composed of a vertical portion 10 that covers the embedded portion outer periphery 9 embedded in the concrete foundation 6, and a horizontal portion 13 that has the same diameter as the pile that covers the pile upper surface 11 and has a hole 12 opened in the center. 12 is in contact with the concrete foundation 6 only by the small cross section 14 formed in 12. The buffer material 7 is composed of a viscoelastic material, a polymer material, a high-damping rubber, rubber, asphalt pitch, lead, or the like having elastic resilience performance or energy absorption performance such as history damping and viscosity damping.

このように杭上面11の外縁部と杭頭部の埋設部外周9とは緩衝材7によりコンクリート基礎6と絶縁され、小断面部14のみで接しているため、杭頭部8が回転しやすくなって杭頭固定度が低下する。したがって、図2に示すように、杭頭部8が回転変形すると垂直部10および水平部13の緩衝材7も変形するため、弾性反発力によって杭5が残留変形を減少させて原点復帰しようとするとともに、緩衝材7のエネルギー吸収力によって建物の揺れが減少し、かつ衝撃力も吸収されて杭5と建物との耐震性能も向上する。また水平力だけでなく引抜力が作用した場合でも、緩衝材7の垂直部10が変形して制振効果が発揮される。一方、軸力と曲げモーメントは小断面部14で支持され、せん断力は摩擦とコンクリート表面の凹凸とによる咬み合い、および基礎との咬み合い(杭頭部がわずかに基礎に埋設された箇所)で負担する。   Thus, since the outer edge portion of the pile upper surface 11 and the buried portion outer periphery 9 of the pile head are insulated from the concrete foundation 6 by the cushioning material 7 and are in contact with each other only by the small cross section 14, the pile head 8 is easily rotated. As a result, the pile head fixing degree decreases. Therefore, as shown in FIG. 2, when the pile head 8 is rotationally deformed, the cushioning material 7 of the vertical portion 10 and the horizontal portion 13 is also deformed, so that the pile 5 tries to return to the origin by reducing the residual deformation by the elastic repulsive force. At the same time, the shaking of the building is reduced by the energy absorbing power of the cushioning material 7, and the impact force is also absorbed to improve the seismic performance of the pile 5 and the building. Further, even when a pulling force is applied as well as a horizontal force, the vertical portion 10 of the cushioning material 7 is deformed and a damping effect is exhibited. On the other hand, the axial force and bending moment are supported by the small cross section 14, and the shearing force is engaged by friction and unevenness of the concrete surface, and is engaged with the foundation (where the pile head is slightly embedded in the foundation). To pay.

図4は第2の実施の形態の基礎構造15である。この基礎構造15は孔12の小断面部14に杭5とコンクリート基礎6とにわたる軸鉄筋16が配筋されたものであり、これ以外は上記の第1の実施の形態の基礎構造1と同じ構成である。この軸鉄筋16は杭5に引抜抵抗を期待する場合や、せん断力が過大な場合に配筋するものであり、引抜抵抗を大きくする場合や、せん断力が過大な場合は集中的に配筋する。   FIG. 4 shows a basic structure 15 according to the second embodiment. This foundation structure 15 is the same as the foundation structure 1 of the first embodiment except that a shaft reinforcing bar 16 extending between the pile 5 and the concrete foundation 6 is arranged on the small cross-sectional portion 14 of the hole 12. It is a configuration. The shaft reinforcing bar 16 is arranged when the pile 5 is expected to have a pulling resistance or when the shearing force is excessive, and when the pulling resistance is increased or the shearing force is excessive, the reinforcing bar is concentrated. To do.

この基礎構造15における緩衝材17は、第1の実施の形態の基礎構造1における緩衝材7と同じ構成であり、同じ効果を奏するものである。   The cushioning material 17 in the foundation structure 15 has the same configuration as the cushioning material 7 in the foundation structure 1 of the first embodiment, and has the same effect.

第1の実施の形態の基礎構造であり、(1)は断面図、(2)は(1)のA−A線断面である。It is a basic structure of a 1st embodiment, (1) is a sectional view and (2) is an AA line section of (1). 第1の実施の形態の基礎構造の水平変形を示す断面図である。It is sectional drawing which shows the horizontal deformation | transformation of the basic structure of 1st Embodiment. 杭頭固定度を示した図である。It is the figure which showed the pile head fixed degree. 第2の実施の形態の基礎構造であり、(1)は断面図、(2)は(1)のB−B線断面である。It is the basic structure of 2nd Embodiment, (1) is sectional drawing, (2) is the BB sectional view of (1). 従来の基礎構造であり、(1)は現場打ちコンクリート杭の基礎構造の断面図、(2)は既製杭の基礎構造の断面図である。It is a conventional foundation structure, (1) is a sectional view of the foundation structure of a cast-in-place concrete pile, and (2) is a sectional view of the foundation structure of a ready-made pile. (1)および(2)は従来の基礎構造の断面図である。(1) And (2) is sectional drawing of the conventional basic structure.

符号の説明Explanation of symbols

1、15 基礎構造
2 ピン接合の基礎構造
3 剛接合の基礎構造
4 地盤
5 杭
6、19 コンクリート基礎
7、17 緩衝材
8、18、22 杭頭部
9 埋設部外周
10 垂直部
11 杭上面
12 孔
13 水平部
14 小断面部
16 軸鉄筋
20 主筋
21 基礎梁
23 テーパ
24 小断面部材
DESCRIPTION OF SYMBOLS 1,15 Foundation structure 2 Foundation structure of pin joining 3 Foundation structure of rigid joining 4 Ground 5 Pile 6, 19 Concrete foundation 7, 17 Buffer material 8, 18, 22 Pile head 9 Peripheral part outer periphery 10 Vertical part 11 Pile upper surface 12 Hole 13 Horizontal part 14 Small cross section 16 Axial reinforcing bar 20 Main bar 21 Foundation beam 23 Taper 24 Small cross section member

Claims (2)

杭頭部が建物の基礎に埋設された杭が緩衝材を介して接合され、該緩衝材は基礎に埋設された杭の埋設部外周を覆う垂直部と、杭上面と同径でかつ中央部に孔が開口された水平部とから構成され、前記孔の小断面部により杭と基礎とが接していることを特徴とする建物の基礎構造。   A pile with a pile head embedded in the foundation of the building is joined via a cushioning material, and the cushioning material has a vertical portion covering the outer periphery of the buried portion of the pile buried in the foundation, the same diameter as the top surface of the pile, and a central portion A building foundation structure characterized in that the pile and the foundation are in contact with each other by a small cross-sectional portion of the hole. 孔の小断面部に杭と基礎とにわたる軸鉄筋が配筋されたことを特徴とする請求項1に記載の建物の基礎構造。   The foundation structure of a building according to claim 1, wherein a shaft reinforcing bar extending between the pile and the foundation is arranged in a small cross section of the hole.
JP2005224006A 2005-08-02 2005-08-02 Foundation structure of building Pending JP2007039938A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007258A (en) * 2008-06-24 2010-01-14 Ohbayashi Corp Structure for joining pile and foundation skeleton together
JP2013256851A (en) * 2012-06-14 2013-12-26 Ohbayashi Corp Structure and method for joining pile and foundation
JP2016099089A (en) * 2014-11-26 2016-05-30 Jfeスチール株式会社 Method for producing raw material for iron production and method for treating ferrous oil-containing sludge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007258A (en) * 2008-06-24 2010-01-14 Ohbayashi Corp Structure for joining pile and foundation skeleton together
JP2013256851A (en) * 2012-06-14 2013-12-26 Ohbayashi Corp Structure and method for joining pile and foundation
JP2016099089A (en) * 2014-11-26 2016-05-30 Jfeスチール株式会社 Method for producing raw material for iron production and method for treating ferrous oil-containing sludge

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