JP4273573B2 - Joint structure of pile and superstructure - Google Patents

Joint structure of pile and superstructure Download PDF

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Publication number
JP4273573B2
JP4273573B2 JP14770499A JP14770499A JP4273573B2 JP 4273573 B2 JP4273573 B2 JP 4273573B2 JP 14770499 A JP14770499 A JP 14770499A JP 14770499 A JP14770499 A JP 14770499A JP 4273573 B2 JP4273573 B2 JP 4273573B2
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JP
Japan
Prior art keywords
pile
upper structure
steel
joint structure
steel bar
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JP14770499A
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Japanese (ja)
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JP2000336666A (en
Inventor
文哉 大杉
郁夫 下田
澄夫 川口
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.)
Oiles Corp
Kume Sekkei KK
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Oiles Corp
Kume Sekkei KK
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Priority to JP14770499A priority Critical patent/JP4273573B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、地盤に打設された杭とこの杭上に構築される事務所ビル、集合住宅、戸建住宅、橋脚等の基礎を含む上部構造物との間の構造、特に、免震機能を付加した、杭と上部構造物との接合構造に関する。
【0002】
【発明が解決しようとする課題】
通常、事務所ビル、集合住宅、戸建住宅、橋脚等(以下、事務所ビル等という)を構築する場合には、地盤に杭を打設し、この杭頭に、当該杭頭から伸びる鉄筋又は鋼材等の鋼棒にコンクリートを絡めるようにして基礎又は事務所ビル等の床スラブを形成する。
【0003】
このような杭は、基礎又は床スラブに鉄筋等を介して固着されることになるために、地震により上部構造物が地盤に対して横揺れ(水平方向振動)すると、杭頭に過大な力が付加され、杭頭が破壊される虞がある。
【0004】
また、最近では、事務所ビル等と杭頭又は基礎との間に免震装置を配して、事務所ビル等と地盤との水平方向の相対移動を免震装置により許容して、事務所ビル等への地盤の振動の伝達を当該免震装置により少なくして、事務所ビル等の免震化が図られているのであるが、斯かる免震装置は、事務所ビル等と杭頭又は基礎との間に配するものであるために、その間に比較的大きな空間を必要とし、事務所ビル等の下面の高さが高くなる虞を有する。
【0005】
本発明は前記諸点に鑑みてなされたものであって、その目的とするところは、杭頭の破壊を回避でき、しかも、事務所ビル等の下面の高さを低くできると共に、免震機能をも具備した、杭と上部構造物との接合構造を提供することにある。
【0006】
【課題を解決するための手段】
本発明の第一の態様の杭と上部構造物との接合構造は、地盤に打設された杭と、この杭の杭頭上に配された上部構造物と、杭に埋設されており、杭頭上において上部構造物に向かって伸びた突出部を有した少なくとも一本の鋼棒と、この鋼棒の突出部の周囲を囲繞して、上部構造物下部に埋設されており、鋼棒の突出部と上部構造物下部との間に介在された鉛又は粘弾性体とを具備している。
【0007】
第一の態様の接合構造によれば、鉛又は粘弾性体が鋼棒の突出部と上部構造物下部との間に介在されているために、地盤に固定される杭に対して上部構造物が横揺れしても、鋼棒の突出部の鉛又は粘弾性体内での変位で当該鉛又は粘弾性体に流動を生じさせて鋼棒の突出部の変位を許容でき、而して、杭頭への大きな力が生じなく杭頭の破壊を回避でき、しかも、鉛の流動又は粘弾性体と鋼棒の突出部との間の相対変位等に基づくエネルギ吸収により上部構造物の横揺れエネルギ(振動エネルギ)を吸収できて、上部構造物を杭上に免震支持できる。
【0008】
第一の態様の接合構造は、鉛又は粘弾性体を介して杭と上部構造物とを連結するものであるために、杭に対して上部構造物が特に水平方向に関して自由度をもち、これにより上部構造物を、杭を介して地盤に対して免震支持できるのである。そして、第一の態様の接合構造では、免震機構が実質的に上部構造物に埋設されるものであるために、免震機構のために特に準備された空間を必要とせず、而して、事務所ビル等の下面の高さを低くできるのである。
【0009】
本発明に用いる鉛としては、所望のエネルギ吸収を行わせるために、高純度、例えば純度99.9%以上のものがよく、一方、粘弾性体としては、エポキシ系高分子材料、シリコーンゲル又は高減衰ゴムからなる粘弾性体を好ましい例として挙げることができる。
【0010】
本発明の鋼棒としては、外周面が平坦な丸棒のような鉄筋又は鋼材でも、これに代えて、外周面に凹凸が形成された異形鉄筋又は異形鋼材でもよいが、鉛又は粘弾性体との軸方向の必要な比較的強固な接合性を得るためには、異形鉄筋が好ましい。
【0011】
本発明の第二の態様の杭と上部構造物との接合構造では、第一の態様の接合構造において、鋼棒は、コンクリート製の杭又は鋼管杭のコンクリート部に予め埋め込まれて、杭に固定された鉄筋又は異形鉄筋からなる。
【0012】
杭としては、上記のように全体がコンクリート製の中実杭若しくは中空杭又はコンクリート製の中実若しくは中空内部杭を鋼管で被覆した鋼管杭のいずれでもよく、このような杭は、工場で予め製造されたものであってもよく、或いは、現場にて打設、製造されたものであってもよい。
【0013】
本発明の第三の態様の杭と上部構造物との接合構造では、第一又は第二の態様の接合構造において、上部構造物下部に埋め込まれた鋼製の筒体を更に具備しており、鉛又は粘弾性体は、筒体の中に収容されている。
【0014】
第三の態様の接合構造によれば、鉛又は粘弾性体を収容する筒体を具備しているために、鉛又は粘弾性体を上部構造物下部に埋設する作業が容易となり、製造性の向上を図ることができる。なお、このような筒体を用いない際には、鋼棒の突出部の周囲を囲繞するように鉛又は粘弾性体を配した後に、コンクリート等を鉛又は粘弾性体の周りに打設して、基礎又は床スラブ等の上部構造物下部を形成するとよい。
【0015】
本発明においては、鉛又は粘弾性体は、鋼棒の突出部の周囲を囲繞していればよく、その形状は、円柱状のものに限らず、四角等の角柱状のものであっても、截頭円錐台状又は鼓状等のいずれの形状のものであってもよい。したがって、筒体もまた、鉛又は粘弾性体の形状に対応した形状であればよく、円筒状のものに限らず、四角等の角筒状のものであっても、截頭円錐台状又は鼓状等のいずれの形状のものであってもよい。
【0016】
本発明の第四の態様の杭と上部構造物との接合構造では、第三の態様の接合構造において、筒体の外周面には凹凸が付されている。
【0017】
第四の態様の接合構造によれば、凹凸により筒体がしっかりと上部構造物下部に保持される。なお、このような凹凸を筒体の内周面に形成して、筒体内の鉛又は粘弾性体をしっかりと筒体に保持させるようにしてもよく、筒体の内外両周面に凹凸を形成すると、鉛又は粘弾性体を上部構造物下部側にしっかりと保持できる。
【0018】
本発明の第五の態様の杭と上部構造物との接合構造では、第一から第四のいずれかの態様の接合構造において、上部構造物下部がコンクリート製の基礎又は床スラブである。
【0019】
本発明の第六の態様の杭と上部構造物との接合構造では、第一から第五のいずれかの態様の接合構造において、鋼棒は、複数本からなり、各鋼棒の突出部の周囲を囲繞して鉛又は粘弾性体が配されている。
【0020】
本発明の第七の態様の杭と上部構造物との接合構造では、第一から第六のいずれかの態様の接合構造において、少なくとも一本の鋼棒は、杭の軸心に配されている。
【0021】
本発明において、上部構造物としては、杭上に基礎を介して事務所ビル、集合住宅、戸建住宅、橋脚等が構築される場合には、この基礎を含めた事務所ビル、集合住宅、戸建住宅又は橋脚等を意味し、杭上に直接に事務所ビル、集合住宅、戸建住宅、橋脚等が構築される場合には、これら事務所ビル、集合住宅、戸建住宅、橋脚等を意味し、後者の場合には、床スラブ等に鉛又は粘弾性体を埋設して本発明を実施する。
【0022】
【発明の実施の形態】
次に本発明の実施の形態を、図に示す好ましい例に基づいて更に詳細に説明する。なお、本発明はこれら例に何等限定されないのである。
【0023】
図1から図5において、本例の杭と上部構造物との接合構造1は、地盤2に打設された多数の杭3と、これら多数の杭3の杭頭4の上に配された上部構造物としての高層の事務所ビル6と、各杭3の杭頭4上において上部構造物の下部である各基礎7に向かって伸びた突出部8を有して、夫々杭3に埋設されて当該杭3に固定された少なくとも一本、本例では8本の鋼棒9と、各杭3において、各鋼棒9の突出部8の周囲を囲繞して、基礎7に埋設されており、各鋼棒9の突出部8と基礎7との間に介在された鉛10と、各鋼棒9に対応して基礎7に埋め込まれた鋼製の円形の筒体11とを具備している。なお、接合構造1では、地震等の振動後において基礎7及び事務所ビル6を各杭3に対して元の位置に復帰させる原点復帰機能を有さないために、原点復帰機能を有した積層ゴム等の免震装置を地盤2と事務所ビル6との間に介在させておくのが好ましい。
【0024】
各杭3は、本例ではコンクリート製であって円柱状に形成されており、各鋼棒9が中心Oの周りで等角度間隔に配されて且つ軸方向に伸びて予め埋め込まれた態様で形成されている。各杭3に対応して配された直方体状の基礎7は、杭3と同様にコンクリート製であって、本例では、杭頭4の上面5に載置されるような態様で形成されている。事務所ビル6は、基礎7の上面にアンカーボルト等により固定されている。
【0025】
夫々の杭3における各鋼棒9は、軸方向に等間隔に配された多数の環状の突起25を有した異形鉄筋からなり、対応の杭3に埋め込まれて杭3に固定されている。各鋼棒9の周りに配された円柱状の鉛10は夫々、筒体11の中に収容されている。本例では、筒体11の外周面26には、軸方向に等間隔に環状の凹凸27及び28が付されている。
【0026】
なお、本例においては、地盤2の表面31と杭頭4の上面5とを面一にしているが、地盤2の表面31と基礎7の下面32との間に隙間を設けてもよい。
【0027】
以上の杭と上部構造物との接合構造1により、事務所ビル6は、多数の基礎7及び杭3を介して地盤2上に免震支持される。すなわち、地震により地盤2が水平方向に振動して、杭3に対して基礎7が水平方向に相対移動すると、各鋼棒9の突出部8が対応の筒体11内で水平方向及び垂直方向に相対変位して、これにより筒体11内の鉛10に塑性流動を生じさせ、鉛10のこの塑性流動により基礎7の振動エネルギ、延いては事務所ビル6の振動エネルギを吸収して、事務所ビル6の地震による振動を可及的に速やかに減衰させる。
【0028】
そして、接合構造1によれば、鉛10が鋼棒9の突出部8と基礎7との間に介在されているために、地盤2に固定される杭3に対して基礎7が横揺れ(水平方向振動)しても、鉛10の塑性流動を生じさせて鋼棒9の突出部8の変位を許容でき、而して、杭頭4への大きな力が生じなく杭頭4の破壊を回避でき、しかも、鉛10と鋼棒9の突出部8との間の相対変位等に基づくエネルギ吸収により基礎7の横揺れエネルギを吸収できて、基礎7を杭3上に免震支持できる。また接合構造1によれば、鉛10を介して杭3と基礎7とを連結しているために、杭3に対して基礎7が特に水平方向に関して自由度をもち、これにより基礎7を、杭3を介して地盤2に対して免震支持できる。
【0029】
なお、本例の接合構造1においては、筒体11内に鉛10を収容したが、これに代えて、筒体11内に、鋼棒9の突出部8を囲繞するように粘弾性体を収容して、鋼棒9の突出部8の相対変位における粘弾性体による速度依存性の粘弾性抵抗を利用して、基礎7の横揺れエネルギを吸収するようにしてもよい。
【0030】
更に上記の杭と上部構造物との接合構造1においては、コンクリート製の杭3を用いたが、これに代えて、杭としては、図6及び図7に示すように、コンクリート製の内部杭41を円形の鋼管42で被覆した鋼管杭3でもよい。
【0031】
更に上記の接合構造1では、鋼棒9を複数本設けたが、図8に示すように、杭3の軸心に一本の鋼棒9を配して接合構造71を構成してもよい。
【0032】
【発明の効果】
本発明によれば、杭頭の破壊を回避できて、しかも、事務所ビル等の下面の高さを低くできると共に、免震機能を具備した杭と上部構造物との接合構造を提供することができる。
【図面の簡単な説明】
【図1】本発明の好ましい実施の形態の一例の断面図である。
【図2】図1に示すII−II線断面図である。
【図3】図1に示す例の一部の拡大図である。
【図4】本発明の好ましい実施の形態の一例が用いられた全体側面説明図である。
【図5】図4の平面一部説明図である。
【図6】本発明の好ましい実施の形態の他の例の断面図である。
【図7】図6に示すVII−VII線断面図である。
【図8】本発明の好ましい実施の形態の更に他の例の断面図である。
【符号の説明】
1 杭と上部構造物との接合構造
2 地盤
3 杭
4 杭頭
5 上面
6 事務所ビル
7 基礎
8 突出部
9 鋼棒
10 鉛
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure between a pile placed on the ground and an upper structure including a foundation such as an office building, an apartment house, a detached house, and a pier constructed on the pile, in particular, a seismic isolation function. It relates to the joint structure between the pile and the superstructure.
[0002]
[Problems to be solved by the invention]
Normally, when building office buildings, apartment houses, detached houses, piers, etc. (hereinafter referred to as office buildings, etc.), piles are placed on the ground, and the reinforcing bars that extend from the pile heads. Alternatively, a floor slab such as a foundation or an office building is formed so that concrete is entangled with a steel rod such as a steel material.
[0003]
Since such piles are fixed to the foundation or floor slab via reinforcing bars, excessive force is applied to the pile head when the upper structure rolls (horizontal vibration) with respect to the ground due to an earthquake. May be added and the pile head may be destroyed.
[0004]
In recent years, seismic isolation devices have been arranged between office buildings and pile heads or foundations, and the relative movement in the horizontal direction between office buildings and the ground is allowed by the seismic isolation devices. The transmission of ground vibrations to buildings, etc. is reduced by the seismic isolation device, and seismic isolation of office buildings has been achieved. Or since it is arranged between the foundation, a relatively large space is required between them, and the height of the lower surface of the office building or the like may be increased.
[0005]
The present invention has been made in view of the above-mentioned points, and the object of the present invention is to avoid the destruction of the pile head and to reduce the height of the lower surface of the office building etc. The present invention also provides a joint structure between a pile and an upper structure.
[0006]
[Means for Solving the Problems]
The joint structure between the pile and the upper structure according to the first aspect of the present invention includes a pile placed on the ground, an upper structure disposed on the pile head of the pile, and a pile embedded in the pile. At least one steel bar with a protrusion extending toward the upper structure above the head and the periphery of the protrusion of the steel bar are embedded in the lower part of the upper structure. Lead or a viscoelastic body interposed between the portion and the lower portion of the upper structure.
[0007]
According to the joint structure of the first aspect, since the lead or viscoelastic body is interposed between the protruding portion of the steel bar and the lower part of the upper structure, the upper structure is against the pile fixed to the ground. Even if the roll rolls, the displacement of the protruding portion of the steel rod can be allowed by the displacement of the protruding portion of the steel rod within the lead or the viscoelastic body, thereby causing the lead or the viscoelastic body to flow. The pile head can be prevented from breaking without generating a large force on the head, and the roll energy of the upper structure is absorbed by energy absorption based on the flow of lead or relative displacement between the viscoelastic body and the protruding part of the steel rod. (Vibration energy) can be absorbed, and the upper structure can be seismically isolated on the pile.
[0008]
Since the joint structure of the first aspect connects the pile and the upper structure via lead or a viscoelastic body, the upper structure has a degree of freedom particularly in the horizontal direction with respect to the pile. Therefore, the upper structure can be supported with respect to the ground via the pile. In the joint structure according to the first aspect, since the seismic isolation mechanism is substantially embedded in the upper structure, a space specially prepared for the seismic isolation mechanism is not required. The height of the lower surface of office buildings can be reduced.
[0009]
The lead used in the present invention is preferably of a high purity, for example, a purity of 99.9% or more, in order to perform desired energy absorption, while the viscoelastic body may be an epoxy polymer material, silicone gel or A preferred example is a viscoelastic body made of high-damping rubber.
[0010]
The steel bar of the present invention may be a rebar or steel material such as a round bar with a flat outer peripheral surface, or alternatively, a deformed rebar or deformed steel material with irregularities formed on the outer peripheral surface, but lead or viscoelastic body In order to obtain the necessary relatively strong bondability in the axial direction, deformed bars are preferred.
[0011]
In the joint structure between the pile and the upper structure according to the second aspect of the present invention, in the joint structure according to the first aspect, the steel rod is embedded in the concrete portion of the concrete pile or the steel pipe pile in advance, It consists of fixed reinforcing bars or deformed reinforcing bars.
[0012]
The pile may be a solid pile or hollow pile made entirely of concrete as described above, or a steel pipe pile covered with a solid or hollow internal pile made of concrete with a steel pipe. It may be manufactured, or may be installed and manufactured on site.
[0013]
The joint structure between the pile and the upper structure according to the third aspect of the present invention further includes a steel cylinder embedded in the lower part of the upper structure in the joint structure according to the first or second aspect. The lead or viscoelastic body is accommodated in the cylinder.
[0014]
According to the joint structure of the third aspect, since the cylinder body that accommodates lead or viscoelastic body is provided, the work of embedding lead or viscoelastic body in the lower part of the upper structure becomes easy, and the productivity is improved. Improvements can be made. When such a cylinder is not used, lead or a viscoelastic body is placed so as to surround the protrusion of the steel rod, and then concrete or the like is placed around the lead or the viscoelastic body. The lower part of the upper structure such as the foundation or the floor slab may be formed.
[0015]
In the present invention, the lead or viscoelastic body only needs to surround the periphery of the protruding portion of the steel rod, and the shape is not limited to a cylindrical shape, and may be a prismatic shape such as a square. Any shape such as a truncated cone shape or a drum shape may be used. Therefore, the cylindrical body may also be a shape corresponding to the shape of lead or viscoelastic body, and is not limited to a cylindrical shape, but may be a rectangular cylindrical shape such as a square, Any shape such as a drum shape may be used.
[0016]
In the joint structure between the pile and the upper structure according to the fourth aspect of the present invention, in the joint structure according to the third aspect, the outer peripheral surface of the cylindrical body is uneven.
[0017]
According to the joint structure of the fourth aspect, the cylindrical body is firmly held on the lower part of the upper structure by the unevenness. Such irregularities may be formed on the inner peripheral surface of the cylinder so that the lead or viscoelastic body in the cylinder is firmly held by the cylinder, and irregularities are formed on both the inner and outer peripheral surfaces of the cylinder. When formed, the lead or viscoelastic body can be firmly held on the lower side of the upper structure.
[0018]
In the joint structure between the pile and the upper structure according to the fifth aspect of the present invention, in the joint structure according to any one of the first to fourth aspects, the lower part of the upper structure is a concrete foundation or floor slab.
[0019]
In the joint structure between the pile and the upper structure according to the sixth aspect of the present invention, in the joint structure according to any one of the first to fifth aspects, the steel bar is composed of a plurality of bars, and the protrusions of the steel bars A lead or viscoelastic body is arranged around the periphery.
[0020]
In the joint structure between the pile and the superstructure according to the seventh aspect of the present invention, in the joint structure according to any one of the first to sixth aspects, at least one steel rod is arranged on the axis of the pile. Yes.
[0021]
In the present invention, as an upper structure, when an office building, an apartment house, a detached house, a bridge pier, etc. are built on a pile via a foundation, an office building, an apartment house including this foundation, It means a detached house or a bridge pier, etc. When an office building, apartment house, detached house, bridge pier, etc. are built directly on a pile, these office building, apartment house, detached house, bridge pier, etc. In the latter case, the present invention is carried out by embedding lead or a viscoelastic body in a floor slab or the like.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0023]
In FIG. 1 to FIG. 5, the joint structure 1 of the pile and the upper structure of this example is arranged on a large number of piles 3 placed on the ground 2 and on the pile heads 4 of the large numbers of piles 3. Buried in each pile 3 with a high-rise office building 6 as an upper structure and a protrusion 8 extending toward each foundation 7 which is the lower part of the upper structure on the pile head 4 of each pile 3 And at least one steel rod 9 fixed to the pile 3 and, in this example, eight steel rods 9, and in each pile 3, the periphery of the protruding portion 8 of each steel rod 9 is surrounded and embedded in the foundation 7. And a lead 10 interposed between the protruding portion 8 of each steel bar 9 and the foundation 7 and a steel circular cylinder 11 embedded in the foundation 7 corresponding to each steel bar 9. ing. In addition, in the joining structure 1, since it does not have the origin return function which returns the foundation 7 and the office building 6 to the original position with respect to each pile 3 after vibrations, such as an earthquake, it is a lamination | stacking which has the origin return function. It is preferable that a seismic isolation device such as rubber is interposed between the ground 2 and the office building 6.
[0024]
Each pile 3 is made of concrete in this example and is formed in a columnar shape, and each steel bar 9 is arranged at equiangular intervals around the center O and extends in the axial direction and embedded in advance. Is formed. The rectangular parallelepiped foundation 7 arranged corresponding to each pile 3 is made of concrete like the pile 3, and in this example, is formed in such a manner that it is placed on the upper surface 5 of the pile head 4. Yes. The office building 6 is fixed to the upper surface of the foundation 7 with anchor bolts or the like.
[0025]
Each steel bar 9 in each pile 3 is formed of a deformed reinforcing bar having a large number of annular protrusions 25 arranged at equal intervals in the axial direction, and is embedded in the corresponding pile 3 and fixed to the pile 3. The columnar lead 10 arranged around each steel rod 9 is accommodated in a cylinder 11. In this example, the outer circumferential surface 26 of the cylindrical body 11 is provided with annular irregularities 27 and 28 at equal intervals in the axial direction.
[0026]
In this example, the surface 31 of the ground 2 and the upper surface 5 of the pile head 4 are flush with each other, but a gap may be provided between the surface 31 of the ground 2 and the lower surface 32 of the foundation 7.
[0027]
The office building 6 is seismically isolated on the ground 2 via a large number of foundations 7 and piles 3 by the joint structure 1 between the above piles and the upper structure. That is, when the ground 2 vibrates in the horizontal direction due to the earthquake, and the foundation 7 moves relative to the pile 3 in the horizontal direction, the protrusions 8 of the steel bars 9 move in the corresponding cylindrical body 11 in the horizontal and vertical directions. To cause a plastic flow in the lead 10 in the cylinder 11, thereby absorbing the vibration energy of the foundation 7 and thus the vibration energy of the office building 6 by this plastic flow of the lead 10, Damping the vibration of the office building 6 as quickly as possible.
[0028]
And according to the joining structure 1, since the lead 10 is interposed between the protrusion part 8 of the steel bar 9, and the foundation 7, the foundation 7 rolls with respect to the pile 3 fixed to the ground 2 ( Even if the vibration in the horizontal direction), the plastic flow of the lead 10 can be caused to allow the displacement of the protruding portion 8 of the steel rod 9, and the pile head 4 can be destroyed without generating a large force on the pile head 4. In addition, the roll energy of the foundation 7 can be absorbed by energy absorption based on the relative displacement between the lead 10 and the protruding portion 8 of the steel bar 9, and the foundation 7 can be supported on the pile 3 by seismic isolation. Moreover, according to the junction structure 1, since the pile 3 and the foundation 7 are connected via the lead 10, the foundation 7 has a degree of freedom particularly in the horizontal direction with respect to the pile 3, and thereby the foundation 7 is Seismic isolation support is possible for the ground 2 via the pile 3.
[0029]
In addition, in the joining structure 1 of this example, the lead 10 was accommodated in the cylinder 11, but it replaced with this and a viscoelastic body was enclosed in the cylinder 11 so that the protrusion part 8 of the steel rod 9 might be surrounded. The rolling energy of the foundation 7 may be absorbed by utilizing the speed-dependent viscoelastic resistance by the viscoelastic body in the relative displacement of the protrusion 8 of the steel bar 9.
[0030]
Furthermore, in the joint structure 1 of the above-mentioned pile and the superstructure, the concrete pile 3 was used, but instead of this, as shown in FIGS. 6 and 7, a concrete internal pile is used. The steel pipe pile 3 which covered 41 with the circular steel pipe 42 may be sufficient.
[0031]
Furthermore, in the above-described joining structure 1, a plurality of steel bars 9 are provided. However, as shown in FIG. 8, the joining structure 71 may be configured by arranging one steel bar 9 on the axis of the pile 3. .
[0032]
【The invention's effect】
According to the present invention, it is possible to avoid the destruction of a pile head and to lower the height of the lower surface of an office building or the like, and to provide a joint structure between a pile and an upper structure having a seismic isolation function. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a preferred embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.
FIG. 3 is an enlarged view of a part of the example shown in FIG. 1;
FIG. 4 is an overall side view illustrating an example of a preferred embodiment of the present invention.
5 is a partial plan view of FIG. 4. FIG.
FIG. 6 is a cross-sectional view of another example of a preferred embodiment of the present invention.
7 is a cross-sectional view taken along line VII-VII shown in FIG.
FIG. 8 is a cross-sectional view of still another example of the preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Joint structure of a pile and superstructure 2 Ground 3 Pile 4 Pile head 5 Top surface 6 Office building 7 Foundation 8 Protrusion 9 Steel bar 10 Lead

Claims (7)

地盤に打設された杭と、この杭に対して水平方向に相対移動することができるように下面が杭の杭頭の上面に当接して当該杭頭上に載置された上部構造物と、杭に埋設されており、杭頭上において上部構造物に向かって伸びた突出部を有した少なくとも一本の鋼棒と、この鋼棒に対応して上部構造物下部に埋め込まれていると共に内周面に凹凸が形成されている筒体と、鋼棒の突出部の周囲を囲繞して、筒体の中に収容されて当該筒体の内周面に保持されており、鋼棒の突出部と上部構造物下部との間に介在された鉛又は粘弾性体とを具備した、杭と上部構造物との接合構造。  A pile placed on the ground, and an upper structure placed on the pile head in contact with the upper surface of the pile head so that the lower surface can move relative to the pile in a horizontal direction; At least one steel bar embedded in the pile and having a protrusion extending toward the upper structure on the top of the pile, and embedded in the lower part of the upper structure corresponding to the steel bar and the inner circumference A cylindrical body having irregularities formed on the surface and surrounding the periphery of the protruding portion of the steel rod, are accommodated in the cylindrical body and held on the inner peripheral surface of the cylindrical body, and the protruding portion of the steel rod A joint structure between a pile and an upper structure, comprising lead or a viscoelastic body interposed between the upper structure and the lower structure. 鋼棒は、コンクリート製の杭又は鋼管杭のコンクリート部に予め埋め込まれて、杭に固定された鉄筋又は異形鉄筋からなる請求項1に記載の杭と上部構造物との接合構造。  The joint structure of a pile and an upper structure according to claim 1, wherein the steel bar is made of a reinforcing bar or a deformed reinforcing bar that is embedded in a concrete part of a concrete pile or a steel pipe pile in advance and fixed to the pile. 筒体は鋼製である請求項1又は2に記載の杭と上部構造物との接合構造。  The tubular body is made of steel, and is a joint structure between a pile and an upper structure according to claim 1 or 2. 筒体の外周面には凹凸が付されている請求項1から3のいずれか一項に記載の杭と上部構造物との接合構造。  The joint structure of a pile and an upper structure according to any one of claims 1 to 3, wherein the outer peripheral surface of the cylindrical body is uneven. 上部構造物下部がコンクリート製の基礎又は床スラブである請求項1から4のいずれか一項に記載の杭と上部構造物との接合構造。  The joint structure of a pile and an upper structure according to any one of claims 1 to 4, wherein the lower part of the upper structure is a concrete foundation or a floor slab. 鋼棒は、複数本からなり、各鋼棒の突出部の周囲を囲繞して鉛又は粘弾性体が配されている請求項1から5のいずれか一項に記載の杭と上部構造物との接合構造。  The steel bar according to any one of claims 1 to 5, wherein the steel bar is composed of a plurality of bars, and a lead or a viscoelastic body is arranged around a protrusion of each steel bar. Bonding structure. 少なくとも一本の鋼棒は、杭の軸心に配されている請求項1から6のいずれか一項に記載の杭と上部構造物との接合構造。  The joint structure of a pile and an upper structure according to any one of claims 1 to 6, wherein at least one steel bar is arranged on an axis of the pile.
JP14770499A 1999-05-27 1999-05-27 Joint structure of pile and superstructure Expired - Lifetime JP4273573B2 (en)

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JP4826977B2 (en) * 2001-07-26 2011-11-30 株式会社トーヨーアサノ Pile head damping structure
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JP5260177B2 (en) * 2008-08-08 2013-08-14 東日本旅客鉄道株式会社 Damper stopper
CN102995651B (en) * 2012-12-10 2015-04-29 霍宏斌 Gravity-type onshore/offshore wind turbine foundation with anchor rod
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