JP2000064304A - Vibration isolation pile - Google Patents
Vibration isolation pileInfo
- Publication number
- JP2000064304A JP2000064304A JP10239032A JP23903298A JP2000064304A JP 2000064304 A JP2000064304 A JP 2000064304A JP 10239032 A JP10239032 A JP 10239032A JP 23903298 A JP23903298 A JP 23903298A JP 2000064304 A JP2000064304 A JP 2000064304A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- outer pipe
- seismic isolation
- upper structure
- horizontal force
- 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.)
- Pending
Links
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- 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、主として杭頭にお
ける耐震性を高めた免震杭に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a seismic isolation pile having improved seismic resistance at the pile head.
【０００２】[0002]
【従来の技術】杭基礎には支持杭形式と摩擦杭形式とが
あり、前者は、良質な支持層が地下深くにある場合に該
支持層まで打ち込んだ杭の上に上部構造物を構築するこ
とによって、構造物重量を支持層で安定支持する形式で
あり、後者は、良質な支持層がない場合に周辺地盤との
摩擦力によって上部構造物を支持する形式の基礎形式で
ある。2. Description of the Related Art Pile foundations are classified into support pile type and friction pile type. In the former, when a good quality support layer is deep underground, an upper structure is built on the pile driven up to the support layer. Therefore, the weight of the structure is stably supported by the supporting layer, and the latter is a basic type of the structure in which the upper structure is supported by the frictional force with the surrounding ground when there is no good supporting layer.
【０００３】これらの杭は、その構造特性から水平力に
対して比較的弱点を持ちやすく、地震時には、上部構造
物からの水平力によって杭頭に大きなせん断力や曲げモ
ーメントが作用する。そのため、杭の設計にあたって
は、地震荷重について十分な検討が行われる。Due to their structural characteristics, these piles tend to have relatively weak points against horizontal force, and during an earthquake, a large shearing force or bending moment acts on the pile head due to the horizontal force from the upper structure. Therefore, when designing piles, sufficient consideration will be given to seismic loads.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上部構
造物がきわめて大きな地震に遭遇した場合には、杭頭に
過大なせん断力や曲げモーメントが作用し、杭の破壊ひ
いては上部構造物の倒壊といった不測の事態を招くおそ
れがある。However, when the superstructure encounters an extremely large earthquake, an excessive shearing force or bending moment acts on the pile head, which causes an accident such as the destruction of the pile and the collapse of the superstructure. May lead to the situation of.
【０００５】本発明は、上述した事情を考慮してなされ
たもので、上部構造物からの水平力による杭の破壊、特
に杭頭での破壊を防止することが可能な免震杭を提供す
ることを目的とする。The present invention has been made in consideration of the above-mentioned circumstances, and provides a seismic isolation pile capable of preventing the pile from being broken by a horizontal force from an upper structure, particularly the pile head. The purpose is to
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明に係る免震杭は請求項１に記載したように、
上部構造物の鉛直荷重を支持する内杭と、該内杭の杭頭
周囲に設けられた外管杭と、該外管杭と前記内杭とをそ
れらの頂部にて一体に連結する連結部とからなり、前記
外管杭は、前記上部構造物からの水平力を周囲の地盤に
伝達するようになっているものである。In order to achieve the above object, the seismic isolation pile according to the present invention has the following features.
An inner pile supporting a vertical load of an upper structure, an outer pipe pile provided around a pile head of the inner pile, and a connecting portion integrally connecting the outer pipe pile and the inner pile at their tops. The outer pipe pile is configured to transmit the horizontal force from the upper structure to the surrounding ground.
【０００７】また、本発明に係る免震杭は、前記外管杭
をエネルギー吸収可能に構成したものである。The seismic isolation pile according to the present invention is constructed such that the outer pipe pile can absorb energy.
【０００８】また、本発明に係る免震杭は、前記外管杭
と前記内杭との隙間に弾性材を介在させたものである。Further, the seismic isolation pile according to the present invention has an elastic material interposed in a gap between the outer pipe pile and the inner pile.
【０００９】また、本発明に係る免震杭は、前記内杭と
前記連結部との間に免震支承を介在させたものである。Further, the seismic isolation pile according to the present invention has a seismic isolation bearing interposed between the inner pile and the connecting portion.
【００１０】本発明に係る免震杭においては、上部構造
物からの鉛直荷重は内杭が支持するが、地震時における
上部構造物からの水平力については、かかる内杭と該内
杭に連結部を介して連結された外管杭とにそれらの剛性
比に応じて分配され、外管杭に分配された水平力は、周
囲の地盤へと伝達される。In the seismic isolation pile according to the present invention, the vertical load from the upper structure is supported by the inner pile, but the horizontal force from the upper structure during an earthquake is connected to the inner pile and the inner pile. The horizontal force distributed to the outer pipe pile connected via the portion according to their rigidity ratio, and the horizontal force distributed to the outer pipe pile is transmitted to the surrounding ground.
【００１１】したがって、上部構造物の鉛直荷重を支持
する内杭の頭部には、該上部構造物からの水平力がその
一部しか伝達されず、杭頭での破損、ひいては上部構造
物への被害といった事態が未然に防止される。Therefore, only a part of the horizontal force from the upper structure is transmitted to the head portion of the inner pile which supports the vertical load of the upper structure, and the damage at the pile head, and eventually to the upper structure. The situation such as the damage of is prevented beforehand.
【００１２】外管杭をどのように構成するかは任意であ
るが、該外管杭をエネルギー吸収可能に構成したなら
ば、上部構造物の振動エネルギーを吸収して地震による
揺れを速やかに減衰させることができる。エネルギー吸
収可能とするには、極軟鋼などの履歴減衰型材料を用い
て外管杭を形成する、通常の鋼に多数のスリットを設け
てエネルギーを吸収しやすいように構成するといった方
法が考えられる。How to construct the outer pipe pile is arbitrary, but if the outer pipe pile is constructed so as to be able to absorb energy, the vibration energy of the upper structure is absorbed and the shaking due to the earthquake is promptly attenuated. Can be made. In order to make it possible to absorb energy, it is conceivable to form the outer pipe pile by using a hysteresis damping material such as ultra-soft steel, or to provide a number of slits in ordinary steel so that it can easily absorb energy. .
【００１３】連結部をどのように構成するかは任意であ
って、外管杭や内杭とは別部材とし、それらと溶接等に
よって連結するようにしてもよいし、外管杭や内杭の一
部として構成してもよい。また、本発明の免震杭は、内
杭、外管杭及び連結部を工場にて相互に連結し、かかる
一体化された状態のものを施工現場に搬入することを主
に想定しているが、溶接等による現場組立を排除するも
のではない。The structure of the connecting portion is arbitrary, and it may be a member separate from the outer pipe pile and the inner pile and connected to them by welding or the like. May be configured as a part of. Further, the seismic isolation pile of the present invention is mainly assumed to connect the inner pile, the outer pipe pile and the connecting portion to each other at the factory, and to bring the integrated one into the construction site. However, this does not exclude on-site assembly such as welding.
【００１４】外管杭と内杭との間に隙間が生じている場
合、その隙間をそのまま放置しておいてもよいが、該隙
間に弾性材を介在させたならば、内杭に伝達された水平
力を該弾性材を介して周囲の外管杭、さらには周囲の地
盤へと逃がすことができるので、内杭の水平力に対する
負担をさらに軽減することができる。弾性材やその使用
形態としては、上述した隙間にコイルバネを放射状に複
数配置する、エアクッションやゴムシートを挟み込む、
ゴム体やスポンジ体を充填するといったことが考えられ
る。When a gap is formed between the outer pipe pile and the inner pile, the gap may be left as it is, but if an elastic material is interposed in the gap, it is transmitted to the inner pile. Since the horizontal force can be released to the surrounding outer pipe pile and further to the surrounding ground through the elastic material, the burden on the horizontal force of the inner pile can be further reduced. As the elastic material and its usage form, a plurality of coil springs are radially arranged in the above-mentioned gap, an air cushion or a rubber sheet is sandwiched,
It is possible to fill it with a rubber body or a sponge body.
【００１５】上部構造物からの水平力がどのような割合
で内杭と外管杭に伝達されるかは、水平変形に対するそ
れらの剛性比に依存するが、内杭と連結部との間に免震
支承を介在させたならば、上部構造物からの水平力をほ
とんどすべて外管杭に流すことができるので、内杭は鉛
直荷重支持用、外管杭は水平荷重負担用という役割分担
が可能となる。免震支承は、要するに上部構造物からの
水平力が実質的に内杭に伝達しない支承形式であればよ
く、具体的には、積層ゴム支承や滑り支承あるいはベア
リング支承などが考えられる。The proportion of horizontal force transmitted from the upper structure to the inner pile and the outer pipe pile depends on their rigidity ratio against horizontal deformation. If seismic isolation bearings are interposed, almost all the horizontal force from the upper structure can flow to the outer pipe pile, so the inner pile is for vertical load support and the outer pipe pile is for horizontal load bearing. It will be possible. The seismic isolation bearing may be any bearing type in which the horizontal force from the upper structure is not substantially transmitted to the inner pile, and specifically, a laminated rubber bearing, a sliding bearing, or a bearing bearing can be considered.
【００１６】[0016]
【発明の実施の形態】以下、本発明に係る免震杭の実施
の形態について、添付図面を参照して説明する。なお、
従来技術と実質的に同一の部品等については同一の符号
を付してその説明を省略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a seismic isolation pile according to the present invention will be described below with reference to the accompanying drawings. In addition,
Parts and the like which are substantially the same as those of the conventional art are designated by the same reference numerals and the description thereof is omitted.
【００１７】図１は、本実施形態に係る免震杭及びその
使用状況を示した図である。同図でわかるように、本実
施形態に係る免震杭１は、上部構造物６の鉛直荷重を支
持する内杭２と、該内杭の杭頭周囲に設けられた外管杭
３と、該外管杭と内杭２とをそれらの頂部にて一体に連
結する連結部としての剛板４とから概ね構成してあり、
外管杭３は、上部構造物６からの水平力を周囲の地盤７
に伝達するようになっている。FIG. 1 is a diagram showing a seismic isolation pile according to this embodiment and its usage. As shown in the figure, the seismic isolation pile 1 according to the present embodiment includes an inner pile 2 that supports a vertical load of the upper structure 6, and an outer pipe pile 3 that is provided around the pile head of the inner pile. The outer pipe pile and the inner pile 2 are generally composed of a rigid plate 4 as a connecting portion for integrally connecting the outer pile and the inner pile 2,
The outer pipe pile 3 applies the horizontal force from the upper structure 6 to the surrounding ground 7.
It is designed to be transmitted to.
【００１８】外管杭３は、上部構造物６からの地震時水
平力を受けて変形する際、該上部構造物の振動エネルギ
ーを吸収できるよう、履歴減衰型の材料、例えば極軟鋼
で形成しておくのがよい。なお、外管杭３は、上部構造
物６からの地震時水平力ができるだけ該外管杭に流れる
よう、その肉厚を厚くして外管杭３自体の剛性を大きく
する、管径をある程度大きくして地盤７からの受動抵抗
を大きくする等の方法で、内杭２の水平剛性よりも十分
大きな水平剛性を確保しておく。The outer pipe pile 3 is formed of a hysteresis damping material, for example, ultra-soft steel, so as to absorb the vibration energy of the upper structure 6 when it is deformed by the horizontal force from the upper structure 6 during an earthquake. It is good to keep it. The outer pipe pile 3 is made thicker to increase the rigidity of the outer pipe pile 3 itself so that the horizontal force at the time of an earthquake from the upper structure 6 flows to the outer pipe pile as much as possible. A horizontal rigidity sufficiently larger than the horizontal rigidity of the inner pile 2 is secured by a method of increasing the passive resistance from the ground 7 or the like.
【００１９】外管杭３と内杭２との隙間には、弾性材と
してのゴム体５を充填してある。A rubber body 5 as an elastic material is filled in the gap between the outer pipe pile 3 and the inner pile 2.
【００２０】本実施形態に係る免震杭１を製作するに
は、剛板４を外管杭３と内杭２の頂部にそれぞれ溶接等
で連結するとともに、外管杭３と内杭２との隙間にゴム
体５を流し込み、所定時間養生して固化させる。これら
の製作は、全て工場にて行うことができる。In order to manufacture the seismic isolation pile 1 according to this embodiment, the rigid plate 4 is connected to the tops of the outer pipe pile 3 and the inner pile 2 by welding or the like, and the outer pipe pile 3 and the inner pile 2 are connected. The rubber body 5 is poured into the gap and cured for a predetermined time to solidify. All of these productions can be performed in the factory.
【００２１】次に、製作された免震杭１を現場で施工す
るには、まず、地盤７に外管杭用埋設穴（図示せず）を
その内径と深さがそれぞれ外管杭３の外径と高さにほぼ
一致するように予め掘削形成する。次に、現場に搬入さ
れた免震杭１を吊持して鉛直姿勢にて保持し、次いで、
該免震杭の内杭２の下端を外管杭用埋設穴の中央に位置
あわせした状態で剛板４の上面を打込み面としてディー
ゼルハンマー等で免震杭１を地盤７に打ち込むか、予め
形成された挿入孔に対して振動圧入する。このような打
込みあるいは圧入作業は、免震杭１の外管杭３が外管杭
用埋設穴にちょうど嵌まり込むまで行う。Next, in order to construct the seismic isolated pile 1 on site, first, a buried hole (not shown) for an outer pipe pile is formed in the ground 7 so that the inner diameter and the depth of the outer pipe pile 3 are different from each other. Preliminary excavation is performed so that the outer diameter and height are almost the same. Next, suspend the seismic isolation pile 1 that has been brought into the site and hold it in a vertical position, then
With the lower end of the inner pile 2 of the seismic isolation pile aligned with the center of the buried hole for the outer pipe pile, the seismic isolation pile 1 is driven into the ground 7 with a diesel hammer or the like using the upper surface of the rigid plate 4 as a driving surface, or Vibration is press-fitted into the formed insertion hole. Such driving or press-fitting work is performed until the outer pipe pile 3 of the seismic isolation pile 1 just fits into the buried hole for the outer pipe pile.
【００２２】免震杭１の打込みあるいは圧入が完了した
ならば、後は従来と同様、図１(c)に示すように免震杭
１の頂部すなわち剛板４の上面に定着用鉄筋８を溶接等
で固定し、しかる後に上部構造物６の基礎版９を施工す
ればよい。なお、同図では、免震杭１の天端を上部構造
物６の基礎版９の下端に一致させてあるが、これに代え
て該免震杭の頭部を基礎版９に埋め込むようにしてもか
まわない。After the seismic isolation pile 1 has been driven in or press-fitted, the fixing bars 8 are attached to the top of the seismic isolation pile 1, that is, the upper surface of the rigid plate 4, as shown in FIG. 1 (c). It may be fixed by welding or the like, and then the foundation plate 9 of the upper structure 6 may be applied. In addition, in the figure, the top end of the seismic isolation pile 1 is aligned with the lower end of the foundation plate 9 of the upper structure 6, but instead of this, the head of the seismic isolation pile is embedded in the foundation plate 9. It doesn't matter.
【００２３】本実施形態に係る免震杭１においては、上
部構造物６からの鉛直荷重は、通常時であれ地震時であ
れ内杭２が支持するが、地震時における上部構造物６か
らの水平力Ｐは、図２に示すように、内杭２と外管杭３
とにそれらの剛性比に応じてそれぞれＰ2、Ｐ1に分配さ
れ、外管杭３に分配された水平力Ｐ1は、周囲の地盤７
へと伝達される。In the seismic isolation pile 1 according to the present embodiment, the vertical load from the upper structure 6 is supported by the inner pile 2 during normal times and during earthquakes. The horizontal force P is, as shown in FIG. 2, the inner pile 2 and the outer pipe pile 3
And the horizontal force P 1 distributed to the outer pipe pile 3 is distributed to P 2 and P 1 according to their rigidity ratios, respectively.
Is transmitted to.
【００２４】また、内杭２の頭部に分配された水平力Ｐ
2は、ゴム体５に取り囲まれた部分については、該ゴム
体を介してΔＰだけ外管杭３、さらには地盤７へと伝達
される。そして、外管杭３及びゴム体５の下縁において
は、Ｐ2−ΔＰの水平力が作用する。Also, the horizontal force P distributed to the head of the inner pile 2
In the portion surrounded by the rubber body 5, 2 is transmitted to the outer pipe pile 3 and further to the ground 7 by ΔP via the rubber body. Then, at the lower edges of the outer pipe pile 3 and the rubber body 5, a horizontal force of P 2 −ΔP acts.
【００２５】以上説明したように、本実施形態に係る免
震杭１によれば、上部構造物６の鉛直荷重を支持する内
杭２とは別に、該内杭を取り囲むようにして外管杭３を
設置するとともに、内杭２と外管杭３の頂部を剛板４で
連結するようにしたので、地震時においては、上部構造
物６からの水平力の一部を外管杭３に逃がすことができ
る。As described above, according to the seismic isolation pile 1 according to the present embodiment, the outer pipe pile is surrounded by the inner pile 2 in addition to the inner pile 2 supporting the vertical load of the upper structure 6. 3 is installed and the tops of the inner pile 2 and the outer pipe pile 3 are connected by the rigid plate 4, so that at the time of an earthquake, part of the horizontal force from the upper structure 6 is applied to the outer pipe pile 3. You can escape.
【００２６】したがって、内杭２に対して外管杭３の水
平剛性をある程度大きくしておけば、上部構造物６から
内杭２に作用する水平力を大幅に低減することが可能と
なり、かくして、杭頭での破損、ひいては上部構造物６
への被害といった事態を未然に防止することが可能とな
る。また、内杭２の断面が地震時水平荷重で決まるよう
な場合においては、水平力負担が小さくなる分、内杭２
の断面寸法を小さくすることが可能となる。Therefore, if the horizontal rigidity of the outer pipe pile 3 relative to the inner pile 2 is increased to some extent, the horizontal force acting on the inner pile 2 from the upper structure 6 can be greatly reduced, thus , Damage at the pile head, and eventually superstructure 6
It is possible to prevent damage to the environment. In addition, when the cross section of the inner pile 2 is determined by the horizontal load during an earthquake, the amount of horizontal force is reduced,
It is possible to reduce the cross-sectional size of the.
【００２７】なお、本実施形態に係る免震杭１は、内杭
１、外管杭３及びそれらを連結する剛板４からなるいわ
ば合成杭であって、工場にて一体製作されたものを現場
に搬入し、これを免震杭１全体として打ち込み、あるい
は圧入することができるので、施工時の作業性は、通常
の杭と何ら変わるところがない。The seismic isolation pile 1 according to this embodiment is a so-called composite pile composed of an inner pile 1, an outer pipe pile 3 and a rigid plate 4 connecting them, which is integrally manufactured at a factory. Since the seismic isolation pile 1 as a whole can be loaded into the site and can be driven in or press-fitted, the workability at the time of construction is no different from that of a normal pile.
【００２８】また、本実施形態に係る免震杭１によれ
ば、外管杭３をエネルギー吸収可能に構成したので、上
部構造物６の振動エネルギーを吸収して地震による揺れ
を速やかに減衰させることができる。Further, according to the seismic isolation pile 1 according to this embodiment, since the outer pipe pile 3 is configured to be capable of absorbing energy, the vibration energy of the upper structure 6 is absorbed and the shaking due to the earthquake is quickly attenuated. be able to.
【００２９】また、本実施形態に係る免震杭１によれ
ば、外管杭３と内杭２との間に生じている隙間に弾性材
であるゴム体５を充填するようにしたので、内杭２に伝
達された水平力を該ゴム体を介して周囲の外管杭３、さ
らには地盤７へと逃がすことが可能となり、内杭２の水
平力に対する負担をさらに軽減することができる。Further, according to the seismic isolation pile 1 according to the present embodiment, the rubber body 5 as the elastic material is filled in the gap formed between the outer pipe pile 3 and the inner pile 2. The horizontal force transmitted to the inner pile 2 can be released to the surrounding outer pipe pile 3 and further to the ground 7 via the rubber body, and the burden on the horizontal force of the inner pile 2 can be further reduced. .
【００３０】本実施形態では、外管杭３を履歴減衰型材
料で形成するようにしたが、かかる履歴減衰をあまりと
れない通常の鋼であっても、図３に示すようなスリット
２２を形成した外管杭２１とすれば、上部構造物１の振
動エネルギーをスリット２２の変形によって吸収し、該
上部構造物の揺れを速やかに減衰させることが可能とな
る。なお、外管杭をエネルギー吸収可能な構成とせずと
も、上部構造物６の鉛直荷重を支持する内杭２の杭頭で
の破損を未然に防止できる点に関しては、上述したと同
様の作用効果を得ることができることは言うまでもな
い。In the present embodiment, the outer pipe pile 3 is made of a hysteresis damping material, but the slit 22 as shown in FIG. With the outer pipe pile 21, the vibration energy of the upper structure 1 can be absorbed by the deformation of the slit 22, and the vibration of the upper structure can be quickly attenuated. Even if the outer pipe pile is not configured to absorb energy, damage to the inner pile 2 supporting the vertical load of the upper structure 6 at the pile head can be prevented in advance. Needless to say that you can get
【００３１】また、本実施形態では、外管杭３と内杭２
との間に生じた隙間に弾性材であるゴム体５を充填する
ようにしたが、かかるゴム体５に代えて上述の隙間にコ
イルバネを放射状に複数配置する、エアクッションを挟
み込むなどの方法を採用してもよいし、かかる隙間を図
４に示すように中空のまま放置してもよい。Further, in this embodiment, the outer pipe pile 3 and the inner pile 2 are arranged.
The rubber body 5, which is an elastic material, is filled in the gap formed between the above and the above. However, in place of the rubber body 5, a plurality of coil springs may be radially arranged in the above-mentioned gap, or a method of sandwiching an air cushion may be used. It may be adopted, or the gap may be left as it is as shown in FIG.
【００３２】また、本実施形態では、外管杭３と内杭２
との間に隙間を設けるようにしたが、隙間を設けずと
も、これら外管杭３と内杭２との剛性比に応じて上部構
造物６からの水平力が両者に分配される点については上
述したと同様であり、杭頭の破損を未然に防止できるこ
とに変わりはない。Further, in this embodiment, the outer pipe pile 3 and the inner pile 2 are arranged.
A gap is provided between the upper pipe 6 and the outer pipe pile 3 and the inner pile 2 according to the rigidity ratio between the outer pipe pile 3 and the inner pile 2 without distributing the gap. Is the same as described above, and the damage to the pile head can be prevented in advance.
【００３３】なお、既に述べたように、上部構造物６か
らの水平力がどのような割合で内杭２と外管杭３に伝達
されるかは、それらの水平方向剛性比に依存するが、こ
こで、図５に示すように、内杭２と連結部である剛板４
との間に免震支承としての積層ゴム支承４１を介在させ
たならば、上部構造物６からの水平力をほとんどすべて
外管杭３に流すことができるので、内杭２は鉛直荷重支
持用、外管杭３は水平荷重負担用という役割分担が可能
となり、内杭２の杭頭での破損をほぼ確実に防止するこ
とができる。As described above, the ratio of the horizontal force from the upper structure 6 to the inner pile 2 and the outer pipe pile 3 depends on their horizontal rigidity ratio. , Here, as shown in FIG. 5, the inner pile 2 and the rigid plate 4 which is a connecting portion.
If a laminated rubber bearing 41 as a seismic isolation bearing is interposed between and, almost all the horizontal force from the upper structure 6 can flow to the outer pipe pile 3, so the inner pile 2 is for vertical load support. The outer pipe pile 3 can share the role of bearing a horizontal load, and the damage to the inner pile 2 at the pile head can be almost certainly prevented.
【００３４】また、本実施形態では、外管杭３の埋設箇
所を外管杭用埋設穴として予め地盤７に掘削形成するよ
うにしたが、かかる工程を省略し、免震杭１をそのまま
打ち込み、あるいは圧入するようにしてもよい。Further, in the present embodiment, the buried portion of the outer pipe pile 3 is formed by excavating it in the ground 7 in advance as a buried hole for the outer pipe pile. However, such a step is omitted and the seismic isolation pile 1 is driven as it is. Alternatively, they may be press-fitted.
【００３５】[0035]
【発明の効果】以上述べたように、請求項１に係る本発
明の免震杭によれば、地震時に上部構造物からの水平力
の一部を外管杭を介して周囲の地盤に逃がすことが可能
となる。そのため、上部構造物から内杭に作用する水平
力は大幅に低減され、該内杭頭部での破損、ひいては上
部構造物への被害といった事態を未然に防止することが
可能となる。As described above, according to the seismic isolation pile of the present invention according to claim 1, a part of the horizontal force from the upper structure is released to the surrounding ground through the outer pipe pile during an earthquake. It becomes possible. Therefore, the horizontal force that acts on the inner pile from the upper structure is significantly reduced, and it is possible to prevent damage to the head portion of the inner pile and eventually damage to the upper structure.
【００３６】また、請求項２に係る本発明の免震杭によ
れば、上部構造物の振動エネルギーを吸収して地震によ
る揺れを速やかに減衰させることができるという効果も
奏する。Further, according to the seismic isolation pile of the present invention according to claim 2, there is an effect that the vibration energy of the upper structure can be absorbed and the shaking due to the earthquake can be quickly damped.
【００３７】また、請求項３に係る本発明の免震杭によ
れば、内杭に伝達された水平力を弾性材を介して周囲の
外管杭、さらには周囲の地盤へと逃がすことが可能とな
り、内杭の水平力に対する負担をさらに軽減することが
できるという効果も奏する。According to the seismic isolation pile of the third aspect of the present invention, the horizontal force transmitted to the inner pile can be released to the outer pipe pile around and further to the surrounding ground through the elastic material. This also makes it possible to further reduce the load on the horizontal force of the inner pile.
【００３８】また、請求項４に係る本発明の免震杭によ
れば、上部構造物からの水平力をほとんどすべて外管杭
に流すことが可能となり、杭頭での破損をほぼ確実に防
止することができるという効果も奏する。According to the seismic isolation pile of the present invention according to claim 4, almost all the horizontal force from the upper structure can be made to flow to the outer pipe pile, and the damage at the pile head can be almost certainly prevented. There is also an effect that can be done.
【００３９】[0039]
【図１】本実施形態に係る免震杭の図であり、(a)は一
部を断面で表示した側面図、(b)はＡ―Ａ線に沿う水平
断面図、(c)はその使用状況を示した全体断面図。FIG. 1 is a diagram of a seismic isolation pile according to the present embodiment, where (a) is a side view in which a part is shown in cross section, (b) is a horizontal cross section along line AA, and (c) is its The whole sectional view showing the use situation.
【図２】本実施形態に係る免震杭の作用を示した側面
図。FIG. 2 is a side view showing the action of the seismic isolation pile according to the present embodiment.
【図３】変形例に係る免震杭を、外管杭及び剛板を一部
断面表示した側面図。FIG. 3 is a side view of the seismic isolation pile according to the modification, in which the outer pipe pile and the rigid plate are partially shown in section.
【図４】別の変形例に係る免震杭を、外管杭及び剛板を
一部断面表示した側面図。FIG. 4 is a side view of a seismic isolation pile according to another modification, in which an outer pipe pile and a rigid plate are partially cross-sectionally displayed.
【図５】別の変形例に係る免震杭を、外管杭及び剛板を
一部断面表示した側面図。FIG. 5 is a side view of a seismic isolation pile according to another modification, in which an outer pipe pile and a rigid plate are partially cross-sectionally displayed.
１ 免震杭 ２ 内杭 ３ 外管杭 ４ 剛板（連結部） ５ ゴム体（弾性材） ６ 上部構造物 ７ 地盤 ２１ 外管杭 ４１ 積層ゴム支承（免震支承） 1 seismic isolation pile 2 inner pile 3 outer pipe pile 4 Rigid plate (connecting part) 5 Rubber body (elastic material) 6 Upper structure 7 ground 21 Outer pipe pile 41 Laminated rubber bearing (seismic isolation bearing)
Claims (4)
と、該内杭の杭頭周囲に設けられた外管杭と、該外管杭
と前記内杭とをそれらの頂部にて一体に連結する連結部
とからなり、前記外管杭は、前記上部構造物からの水平
力を周囲の地盤に伝達するようになっていることを特徴
とする免震杭。1. An inner pile for supporting a vertical load of an upper structure, an outer pipe pile provided around a pile head of the inner pile, and the outer pipe pile and the inner pile integrated at their tops. A seismic isolation pile, wherein the outer pipe pile is configured to transmit the horizontal force from the upper structure to the surrounding ground.
した請求項１記載の免震杭。2. The seismic isolation pile according to claim 1, wherein the outer pipe pile is configured to absorb energy.
を介在させた請求項１記載の免震杭。3. The seismic isolation pile according to claim 1, wherein an elastic material is interposed in a gap between the outer pipe pile and the inner pile.
を介在させた請求項１記載の免震杭。4. The seismic isolation pile according to claim 1, wherein a seismic isolation bearing is interposed between the inner pile and the connecting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10239032A JP2000064304A (en) | 1998-08-25 | 1998-08-25 | Vibration isolation pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10239032A JP2000064304A (en) | 1998-08-25 | 1998-08-25 | Vibration isolation pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000064304A true JP2000064304A (en) | 2000-02-29 |
Family
ID=17038877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10239032A Pending JP2000064304A (en) | 1998-08-25 | 1998-08-25 | Vibration isolation pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000064304A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| JP2013238006A (en) * | 2012-05-14 | 2013-11-28 | Kumikawa Tekkosho:Kk | Pile for reducing vibration |
| CN113638361A (en) * | 2021-08-26 | 2021-11-12 | 哈尔滨工业大学 | Connection structure of port and pier PHC tubular pile and superstructure |
-
1998
- 1998-08-25 JP JP10239032A patent/JP2000064304A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| JP2013238006A (en) * | 2012-05-14 | 2013-11-28 | Kumikawa Tekkosho:Kk | Pile for reducing vibration |
| CN113638361A (en) * | 2021-08-26 | 2021-11-12 | 哈尔滨工业大学 | Connection structure of port and pier PHC tubular pile and superstructure |
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