JP2005344388A - Pile head connection structure - Google Patents

Pile head connection structure Download PDF

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Publication number
JP2005344388A
JP2005344388A JP2004165714A JP2004165714A JP2005344388A JP 2005344388 A JP2005344388 A JP 2005344388A JP 2004165714 A JP2004165714 A JP 2004165714A JP 2004165714 A JP2004165714 A JP 2004165714A JP 2005344388 A JP2005344388 A JP 2005344388A
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Prior art keywords
pile
foundation
pile head
head
core material
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JP2004165714A
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Kentaro Nakagawa
健太郎 中川
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Priority to JP2004165714A priority Critical patent/JP2005344388A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile head connection structure which can reduce the stress of a foundation beam similarly to a conventional pile head pin structure, facilitates the construction thereof, and contributes to cost reduction. <P>SOLUTION: A core 4 formed of a wide flange beam or a steel pipe and having a plurality of studs 9, 9, etc. welded to one end 4a thereof is embedded in a pile 1 along a center shaft C of the pile. The core 4 is protruded from a pile head 2 of the pile 1 to penetrate through a foundation 3 supported to the pile 1, and extended to a column base 6a of a column 6 erected on the foundation 3. Further an insulation layer 5 formed of polystyrene foam is arranged at a boundary between the pile head 2 of the pile 1 and the foundation 3, except a peripheral portion of the core 4. The pile head 2 is formed like a truncated cone in which the center thereof is protruded to the foundation 3 relative to a peripheral portion of the same, and a peripheral wall 3a enclosing the pile head 2 is formed on the lower peripheral surface of the foundation 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、地盤内に設置される杭と当該杭によって支持される基礎とを接合するための杭頭接合構造に関する。   The present invention relates to a pile head joint structure for joining a pile installed in the ground and a foundation supported by the pile.

従来、地震等による大きな水平力が杭基礎に作用すると、杭頭部に生じる過大な応力によって杭頭部が破壊される場合があった。これに対して、杭頭部と基礎との接合部を、相対回転を許すピン構造とすることにより、杭頭部に生じる応力を低減する杭頭構造が考案されている(例えば、特許文献1参照。)。
特開2001−348885号公報(第2−3頁、第1図)
Conventionally, when a large horizontal force due to an earthquake or the like acts on a pile foundation, the pile head may be destroyed due to excessive stress generated in the pile head. On the other hand, the pile head structure which reduces the stress which arises in a pile head by making the junction part of a pile head and a foundation into the pin structure which permits a relative rotation is devised (for example, patent document 1). reference.).
JP 2001-348885 A (page 2-3, FIG. 1)

しかしながら、従来の杭頭ピン構造では、高価な治具を用いなければならないうえ、引張に対しては、杭にせん断力を伝達できないという問題があった。
本発明は、上述する問題点に鑑みてなされたもので、従来の杭頭ピン構造と同様に基礎梁の応力を低減でき、且つ、施工が容易で、コストダウンも図れる杭頭接合構造を提供することを目的とする。
However, in the conventional pile head pin structure, an expensive jig must be used, and there is a problem that shear force cannot be transmitted to the pile against tension.
The present invention has been made in view of the above-described problems, and provides a pile head joint structure that can reduce the stress of the foundation beam as in the conventional pile head pin structure, can be easily constructed, and can reduce costs. The purpose is to do.

上記目的を達成するため、本発明に係る杭頭接合構造では、杭の杭頭部と当該杭によって支持される基礎との接合構造であって、前記杭の中心軸上に埋設される鉄骨からなる芯材が、前記杭の杭頭部から延出して前記基礎内に埋設されるとともに、前記杭の杭頭部と前記基礎との境界部には絶縁層が設けられていることを特徴とする。
ここで、芯材としてはH形鋼や鋼管など剛性が高く変形性能も優れた材料が好適である。また、絶縁層を形成する材料としては発泡ポリスチレンなどの発泡樹脂が利用できる。
本発明では、杭の中心軸上に埋設される芯材が杭頭部から延出して基礎内に埋設されるとともに、杭頭部と基礎との境界部に絶縁層が設けられることにより、杭頭部と基礎間に鉛直面内の回転を許容するピン構造を実現している。これにより、杭と上部構造間で曲げモーメントが伝達されることはなく、基礎梁の応力も低減される。しかも、本発明では、従来の杭頭ピン構造と異なり、上部構造のせん断力と引張力は芯材を介して杭に伝達される。
また、本発明では、高価な治具を使用せず、芯材と絶縁層によりピン構造を実現しているので、コストダウンが図れる。
さらに、本発明では、芯材の周辺部を除いて、杭頭部と基礎とは絶縁層により縁が切れているので、杭主筋と基礎鉄筋とが干渉することはなく、施工が容易となる。
In order to achieve the above object, the pile head joint structure according to the present invention is a joint structure between a pile head and a foundation supported by the pile, from a steel frame embedded on the central axis of the pile. The core material is extended from the pile head of the pile and embedded in the foundation, and an insulating layer is provided at the boundary between the pile head of the pile and the foundation. To do.
Here, as the core material, a material having high rigidity and excellent deformation performance such as H-shaped steel and steel pipe is suitable. In addition, as a material for forming the insulating layer, a foamed resin such as expanded polystyrene can be used.
In the present invention, the core material embedded on the central axis of the pile extends from the pile head and is embedded in the foundation, and an insulating layer is provided at the boundary between the pile head and the foundation, whereby the pile A pin structure that allows rotation in the vertical plane between the head and the foundation is realized. Thereby, no bending moment is transmitted between the pile and the superstructure, and the stress of the foundation beam is reduced. Moreover, in the present invention, unlike the conventional pile head pin structure, the shearing force and tensile force of the superstructure are transmitted to the pile via the core material.
In the present invention, since an expensive jig is not used and the pin structure is realized by the core material and the insulating layer, the cost can be reduced.
Furthermore, in the present invention, since the edge of the pile head and the foundation is cut by the insulating layer except for the peripheral portion of the core material, the pile main reinforcement and the foundation reinforcing bar do not interfere with each other, and the construction becomes easy. .

また、本発明に係る杭頭接合構造では、前記杭の杭頭部の形状は、周縁部に比べて中心部が前記基礎側に突出する円錐台状であることが好ましい。
本発明では、杭頭部の形状を円錐台状とすることにより、杭頭部と基礎間に鉛直面内の回転が生じても、杭頭部と基礎とは干渉せず、理想的なピン構造を実現することができる。
Moreover, in the pile head junction structure which concerns on this invention, it is preferable that the shape of the pile head of the said pile is a truncated cone shape where a center part protrudes to the said foundation side compared with a peripheral part.
In the present invention, by making the shape of the pile head into a truncated cone, even if rotation in the vertical plane occurs between the pile head and the foundation, the pile head and the foundation do not interfere with each other, and an ideal pin A structure can be realized.

また、本発明に係る杭頭接合構造では、前記芯材は、前記基礎上に立設される柱の少なくとも柱脚部まで延設されていてもよい。
本発明では、芯材が柱の少なくとも柱脚部まで延設されることにより、柱に生じるせん断力と引張力を芯材を介して杭に伝達することができる。さらに、芯材を建物の地下階部分の掘削に先立ち建込まれる構真柱として利用することもできる。
Moreover, in the pile head joint structure which concerns on this invention, the said core material may be extended to the column base part at least of the column standingly arranged on the said foundation.
In the present invention, by extending the core material to at least the column base of the column, the shearing force and tensile force generated in the column can be transmitted to the pile via the core material. Furthermore, the core material can be used as a structural pillar built prior to excavation of the basement portion of the building.

また、本発明に係る杭頭接合構造では、前記基礎の下面周縁部には、前記杭の杭頭部を囲繞する周壁が形成されていてもよい。
本発明では、基礎の下面周縁部に杭頭部を囲繞する周壁を形成することにより、杭頭部と基礎間に予想外の大きな回転角が生じた場合でも、周壁がストッパーとなってそれ以上の大きな回転を防止し、構造物の安全を確保する。
Moreover, in the pile head joining structure which concerns on this invention, the surrounding wall surrounding the pile head of the said pile may be formed in the lower surface peripheral part of the said foundation.
In the present invention, by forming a peripheral wall surrounding the pile head at the lower peripheral edge of the foundation, even if an unexpected large rotation angle occurs between the pile head and the foundation, the peripheral wall becomes a stopper and beyond. Prevents large rotation of the structure and ensures the safety of the structure.

本発明によれば、杭の中心軸上に埋設される芯材が杭頭部から延出して基礎内に埋設されるとともに、杭頭部と基礎との境界部に絶縁層が設けられることによりピン構造が実現され、従来の杭頭ピン構造と同様に基礎梁の応力を低減できるうえ、施工が容易で、コストダウンも併せて図ることができる。   According to the present invention, the core material embedded on the center axis of the pile extends from the pile head and is embedded in the foundation, and the insulating layer is provided at the boundary between the pile head and the foundation. The pin structure is realized, and the stress of the foundation beam can be reduced similarly to the conventional pile head pin structure, and the construction is easy and the cost can be reduced.

以下、本発明に係る杭頭接合構造の実施形態について図面に基いて説明する。
図1は、本発明に係る杭頭接合構造の実施形態の一例を示す立断面図である。
図1に示すように、杭1の中心軸C上には、一方の端部4aに複数のスタッド9…が溶接されたH形鋼もしくは鋼管からなる芯材4が埋設されており、杭1の杭頭部2から延出して、杭1に支持されている基礎3を貫通し、基礎3上に立設される柱6の柱脚部6aまで延在している。
また、杭1の杭頭部2と基礎3との境界部には、芯材4の周辺部を除いて発泡ポリスチレンからなる絶縁層5が設けられている。杭主筋7および基礎鉄筋8は、絶縁層5を貫通せず、それぞれ杭1および基礎3内に定着されている。そのため、杭主筋7と基礎鉄筋8が干渉することはなく、施工が容易となる。
Hereinafter, an embodiment of a pile head joint structure according to the present invention will be described based on the drawings.
FIG. 1 is an elevational sectional view showing an example of an embodiment of a pile head joint structure according to the present invention.
As shown in FIG. 1, a core 4 made of H-section steel or a steel pipe, in which a plurality of studs 9 are welded to one end 4 a, is embedded on the central axis C of the pile 1. It extends from the pile head 2, penetrates the foundation 3 supported by the pile 1, and extends to the column base 6 a of the column 6 standing on the foundation 3.
An insulating layer 5 made of expanded polystyrene is provided at the boundary between the pile head 2 and the foundation 3 of the pile 1 except for the peripheral portion of the core material 4. The pile main reinforcement 7 and the foundation rebar 8 do not penetrate the insulating layer 5 and are fixed in the pile 1 and the foundation 3, respectively. Therefore, the pile main reinforcement 7 and the foundation rebar 8 do not interfere with each other, and the construction becomes easy.

杭頭部2の形状は、周縁部に比べて中心部が基礎3側に突出する円錐台状をしている。これにより、杭頭部2と基礎3間に鉛直面内の回転が生じても、杭頭部2と基礎3とは干渉せず、理想的なピン構造を実現することができる。   The shape of the pile head 2 has a truncated cone shape with the center portion protruding toward the foundation 3 side as compared with the peripheral edge portion. Thereby, even if the rotation in a vertical plane arises between the pile head 2 and the foundation 3, the pile head 2 and the foundation 3 do not interfere, and an ideal pin structure can be realized.

一方、基礎3の下面周縁部には、杭頭部2を囲繞する周壁3aが形成されている。これにより、杭頭部2と基礎3間に予想外の大きな回転角を生じた場合でも、周壁3aがストッパーとなってそれ以上の大きな回転を防止し、構造物の安全が確保される。   On the other hand, a peripheral wall 3 a that surrounds the pile head 2 is formed on the peripheral edge of the lower surface of the foundation 3. As a result, even when an unexpectedly large rotation angle is generated between the pile head 2 and the foundation 3, the peripheral wall 3a serves as a stopper to prevent further rotation, thereby ensuring the safety of the structure.

本実施形態による杭頭接合構造では、杭1の中心軸C上に埋設される芯材4が杭頭部2から延出して基礎3内に埋設されるとともに、杭頭部2と基礎3との境界部に絶縁層5が設けられることにより、杭頭部2と基礎3間に鉛直面内の回転を許容するピン構造を実現している。これにより、杭1と上部構造間で曲げモーメントが伝達されることはなく、基礎梁の応力も低減される。しかも、本実施形態では、従来の杭頭ピン構造と異なり、上部構造のせん断力と引張力は芯材4を介して杭1に伝達される。
また、本実施形態による杭頭接合構造では、高価な治具を使用せず、芯材4と絶縁層5によりピン構造を実現しているので、コストダウンが図れる。
さらに、本実施形態による杭頭接合構造では、芯材4が柱6の柱脚部6aまで延設されることにより、柱6に生じるせん断力と引張力を芯材4を介して杭1に伝達することができるうえ、芯材4を建物の地下階部分の掘削に先立ち建込まれる構真柱として利用することもできる。
In the pile head joint structure according to the present embodiment, the core material 4 embedded on the central axis C of the pile 1 extends from the pile head 2 and is embedded in the foundation 3, and the pile head 2 and the foundation 3 By providing the insulating layer 5 at the boundary portion, a pin structure that allows rotation in the vertical plane between the pile head 2 and the foundation 3 is realized. Thereby, a bending moment is not transmitted between the pile 1 and the superstructure, and the stress of the foundation beam is also reduced. Moreover, in this embodiment, unlike the conventional pile head pin structure, the shearing force and tensile force of the upper structure are transmitted to the pile 1 via the core material 4.
Further, in the pile head joint structure according to the present embodiment, since a pin structure is realized by the core material 4 and the insulating layer 5 without using an expensive jig, the cost can be reduced.
Furthermore, in the pile head joint structure according to the present embodiment, the core material 4 is extended to the column base portion 6 a of the column 6, whereby the shearing force and the tensile force generated in the column 6 are applied to the pile 1 through the core material 4. In addition to being able to transmit, the core material 4 can also be used as a structural pillar to be built prior to excavation of the basement of the building.

以上、本発明に係る杭頭接合構造の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、上記の実施形態では、コンクリート杭を使用しているが、鋼管杭やコンクリート充填鋼管杭などでもよい。   As mentioned above, although embodiment of the pile head junction structure concerning this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, although the concrete pile is used in the above embodiment, a steel pipe pile or a concrete-filled steel pipe pile may be used.

本発明に係る杭頭接合構造の実施形態の一例を示す立断面図である。It is an elevation sectional view showing an example of an embodiment of a pile head junction structure concerning the present invention.

符号の説明Explanation of symbols

1 杭
2 杭頭部
3 基礎
4 芯材
5 絶縁層
6 柱
7 杭主筋
8 基礎鉄筋
9 スタッド
DESCRIPTION OF SYMBOLS 1 Pile 2 Pile head 3 Foundation 4 Core material 5 Insulation layer 6 Pillar 7 Pile main reinforcement 8 Foundation reinforcement 9 Stud

Claims (4)

杭の杭頭部と当該杭によって支持される基礎との接合構造であって、
前記杭の中心軸上に埋設される鉄骨からなる芯材が、前記杭の杭頭部から延出して前記基礎内に埋設されるとともに、前記杭の杭頭部と前記基礎との境界部には絶縁層が設けられていることを特徴とする杭頭接合構造。
It is a joint structure between the pile head and the foundation supported by the pile,
A core material made of a steel frame embedded on the center axis of the pile extends from the pile head of the pile and is embedded in the foundation, and at the boundary between the pile head of the pile and the foundation. Is a pile head joint structure characterized by an insulating layer.
前記杭の杭頭部の形状は、周縁部に比べて中心部が前記基礎側に突出する円錐台状であることを特徴とする請求項1に記載の杭頭接合構造。   The pile head joint structure according to claim 1, wherein a shape of a pile head of the pile is a truncated cone shape having a center portion protruding toward the foundation side as compared with a peripheral edge portion. 前記芯材は、前記基礎上に立設される柱の少なくとも柱脚部まで延設されていることを特徴とする請求項1または2に記載の杭頭接合構造。   The pile head joint structure according to claim 1 or 2, wherein the core material is extended to at least a column base of a column erected on the foundation. 前記基礎の下面周縁部には、前記杭の杭頭部を囲繞する周壁が形成されていることを特徴とする請求項1乃至3のいずれかに記載の杭頭接合構造。   The pile head joint structure according to any one of claims 1 to 3, wherein a peripheral wall surrounding a pile head portion of the pile is formed at a peripheral edge portion of the lower surface of the foundation.
JP2004165714A 2004-06-03 2004-06-03 Pile head connection structure Pending JP2005344388A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007162416A (en) * 2005-12-16 2007-06-28 Takenaka Komuten Co Ltd Concrete pile joining method
JP2008082073A (en) * 2006-09-28 2008-04-10 Okumura Corp Joint structure of pile and post
JP2008082074A (en) * 2006-09-28 2008-04-10 Okumura Corp Joint structure of pile and post
JP2009013720A (en) * 2007-07-06 2009-01-22 Taisei Corp Method of repairing pile foundation structure
CN102561330A (en) * 2011-12-29 2012-07-11 中铁十六局集团北京轨道交通工程建设有限公司 Integrated construction method for artificial dug pile and steel pipe concrete column
JP2013112945A (en) * 2011-11-25 2013-06-10 Shimizu Corp Pin connection structure of foundation pile
JP2016070032A (en) * 2014-10-02 2016-05-09 株式会社フジタ Pile head semi-rigid connection structure of cast-in-site concrete pile

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007162416A (en) * 2005-12-16 2007-06-28 Takenaka Komuten Co Ltd Concrete pile joining method
JP4675226B2 (en) * 2005-12-16 2011-04-20 株式会社竹中工務店 Method for joining concrete piles
JP2008082073A (en) * 2006-09-28 2008-04-10 Okumura Corp Joint structure of pile and post
JP2008082074A (en) * 2006-09-28 2008-04-10 Okumura Corp Joint structure of pile and post
JP4708295B2 (en) * 2006-09-28 2011-06-22 株式会社奥村組 Pile-column connection structure
JP4708296B2 (en) * 2006-09-28 2011-06-22 株式会社奥村組 Pile-column connection structure
JP2009013720A (en) * 2007-07-06 2009-01-22 Taisei Corp Method of repairing pile foundation structure
JP2013112945A (en) * 2011-11-25 2013-06-10 Shimizu Corp Pin connection structure of foundation pile
CN102561330A (en) * 2011-12-29 2012-07-11 中铁十六局集团北京轨道交通工程建设有限公司 Integrated construction method for artificial dug pile and steel pipe concrete column
CN102561330B (en) * 2011-12-29 2014-06-18 中铁十六局集团北京轨道交通工程建设有限公司 Integrated construction method for artificial dug pile and steel pipe concrete column
JP2016070032A (en) * 2014-10-02 2016-05-09 株式会社フジタ Pile head semi-rigid connection structure of cast-in-site concrete pile

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