JP3064887B2 - Seismic isolation structure of pile - Google Patents

Seismic isolation structure of pile

Info

Publication number
JP3064887B2
JP3064887B2 JP7294831A JP29483195A JP3064887B2 JP 3064887 B2 JP3064887 B2 JP 3064887B2 JP 7294831 A JP7294831 A JP 7294831A JP 29483195 A JP29483195 A JP 29483195A JP 3064887 B2 JP3064887 B2 JP 3064887B2
Authority
JP
Japan
Prior art keywords
pile
footing
slide pedestal
pedestal
seismic isolation
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.)
Expired - Fee Related
Application number
JP7294831A
Other languages
Japanese (ja)
Other versions
JPH09111774A (en
Inventor
雄輔 石井
章吉 後閑
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.)
Obayashi Corp
Original Assignee
Obayashi Corp
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 Obayashi Corp filed Critical Obayashi Corp
Priority to JP7294831A priority Critical patent/JP3064887B2/en
Publication of JPH09111774A publication Critical patent/JPH09111774A/en
Application granted granted Critical
Publication of JP3064887B2 publication Critical patent/JP3064887B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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、構造物を支持する
杭の免震構造に関する。
TECHNICAL FIELD The present invention relates to a seismic isolation structure for a pile supporting a structure.

【0002】[0002]

【従来の技術】杭基礎は、良質な支持層が地下深くにあ
る場合に採用される基礎形式の一つであり、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ことができるも
のである。
2. Description of the Related Art A pile foundation is one of the types of foundation adopted when a high-quality support layer is deep underground. By constructing an upper structure on a pile driven into the support layer, The weight of the structure can be stably supported by the support layer.

【0003】かかる杭は、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
から大きな水平力や曲げモーメントが杭頭に作用する。
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。
[0003] Such a pile tends to have a relatively weak point against horizontal force due to its structural characteristics, and in the event of an earthquake, a large horizontal force or bending moment acts on the pile head from the upper structure.
Therefore, when designing piles, sufficient consideration is 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、きわめ
て大きな地震に遭遇した場合には、杭頭には過大な水平
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 an extremely large earthquake is encountered, an excessive horizontal force or bending moment acts on the pile head, and unexpected situations such as breakage of the pile and collapse of the superstructure may occur. May be invited.

【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や曲げモーメントに
よる杭の破壊を防止することが可能な杭の免震構造を提
供することを目的とする。
The present invention has been made in view of the above circumstances, and has as its object to provide a seismic isolation structure for a pile capable of preventing the pile from being destroyed by a horizontal force or a bending moment from an upper structure. Aim.

【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、本発明に係る杭の免震構造は請求項1に記載したよ
うに、群杭上に設置されるフーチングを該群杭の頭部に
固定される下部フーチングとその上方に配設される上部
フーチングとに分割形成し、前記下部フーチングの上端
にほぼ円形の底板の周囲に帯板を立設してなる下部摺動
台座を取り付けるとともに前記上部フーチングの下端に
ほぼ円形の天板の周囲に帯板を立設してなる上部摺動台
座を取り付け、前記上部摺動台座の天板および前記下部
摺動台座の底板を摺動面として転動するように球状の転
動体を前記下部摺動台座と前記上部摺動台座との間に装
填するとともに、前記上部摺動台座の帯板の外側周面と
前記下部摺動台座の帯板の内側周面との間にリング状に
形成されたダンパー部材を嵌め込んだものである。
According to a first aspect of the present invention, there is provided a pile seismic isolation structure according to the present invention, wherein a footing installed on a group pile is attached to the head of the group pile. The lower footing fixed to the lower footing and the upper footing disposed above the lower footing are formed separately, and a lower slide pedestal formed by erecting a band plate around a substantially circular bottom plate is attached to the upper end of the lower footing. At the lower end of the upper footing, an upper sliding pedestal having a band plate erected around a substantially circular top plate is attached, and the top plate of the upper sliding pedestal and the bottom plate of the lower sliding pedestal are used as sliding surfaces. A spherical rolling element is loaded between the lower slide pedestal and the upper slide pedestal so as to roll, and an outer peripheral surface of a band plate of the upper slide pedestal and a band plate of the lower slide pedestal. Ring-shaped damper with the inner peripheral surface of the In which is fitted into the wood.

【0007】[0007]

【0008】請求項1の発明に係る杭の免震構造におい
ては、地震時には上部フーチングと下部フーチングとの
相対移動が許容され、地盤から上部構造物に入力する地
震エネルギー並びに上部構造物から杭頭に作用する水平
力や曲げモーメントは大幅に低減する。また、両台座間
にはダンパー部材を配置してあり、地震時には、上部構
造物の振動エネルギーが該ダンパー部材で吸収される。
In the seismic isolation structure for a pile according to the first aspect of the present invention, the relative movement between the upper footing and the lower footing is allowed during an earthquake, and the seismic energy input from the ground to the upper structure and the pile head from the upper structure. The horizontal force and bending moment acting on the surface are greatly reduced. In addition, a damper member is disposed between the two pedestals, and during an earthquake, vibration energy of the upper structure is absorbed by the damper member.

【0009】[0009]

【0010】[0010]

【発明の実施の形態】以下、本発明に係る杭の免震構造
の実施の形態について、添付図面を参照して説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a seismic isolation structure for a pile according to the present invention will be described below with reference to the accompanying drawings.

【0011】図1は、本実施形態に係る杭の免震構造を
示した全体図である。同図でわかるように、本実施形態
に係る杭の免震構造は、杭1の頭部に取り付けられた杭
側摺動台座2とフーチング3の下面に取り付けられたフ
ーチング側摺動台座4との間に球状の転動体5を装填す
るとともに、杭側摺動台座2とフーチング側摺動台座4
との間にダンパー部材6を配設してある。
FIG. 1 is an overall view showing a seismic isolation structure for a pile according to this embodiment. As can be seen from the figure, the pile seismic isolation structure according to the present embodiment includes a pile-side sliding pedestal 2 attached to the head of the pile 1 and a footing-side sliding pedestal 4 attached to the lower surface of the footing 3. Between the pile-side sliding base 2 and the footing-side sliding base 4.
And a damper member 6 is disposed between them.

【0012】杭側摺動台座2は、図2の分解斜視図でよ
くわかるように、転動体5が転動するほぼ円形の底板1
1の周囲に帯板12を立設してなり、フーチング側摺動
台座4も同様、転動体5が転動するほぼ円形の天板13
の周囲に帯板14を立設してなる。底板11の上面およ
び天板13の下面は、転動体5の転がり摩擦ができるだ
け小さくなるように例えばテフロン材を被覆しておくの
がよい。
As can be clearly seen from the exploded perspective view of FIG. 2, the pile-side slide base 2 has a substantially circular bottom plate 1 on which the rolling elements 5 roll.
1, a foot plate 13 having a substantially circular top plate 13 on which the rolling element 5 rolls.
And a band plate 14 is provided upright. The upper surface of the bottom plate 11 and the lower surface of the top plate 13 are preferably coated with, for example, Teflon material so that the rolling friction of the rolling elements 5 is as small as possible.

【0013】杭側摺動台座2は、図1に示すように、底
板11の下面に固着されたアンカー筋15と杭1の主筋
16とをコンクリート7に定着させることによって杭1
にしっかりと固定してあり、同様に、フーチング側摺動
台座4は、天板13の上面に固着されたアンカー筋17
をフーチング3のコンクリートに定着させることによっ
て、該フーチング3にしっかりと固定してある。
As shown in FIG. 1, the pile-side sliding pedestal 2 secures the anchor bar 15 fixed to the lower surface of the bottom plate 11 and the main bar 16 of the pile 1 to the concrete 7 by fixing the same to the concrete 7.
Similarly, the footing-side slide pedestal 4 is provided with an anchor stud 17 fixed to the upper surface of the top plate 13.
Is firmly fixed to the footing 3 by fixing it to the concrete of the footing 3.

【0014】ダンパー部材6は、例えば高減衰ゴムを用
いて図2に示すようなリング状に形成してあり、フーチ
ング側摺動台座4の帯板14の外側周面と杭側摺動台座
2の帯板12の内側周面との間に嵌め込んである。な
お、ダンパー部材6自体を止水性材料で形成するととも
に、該部材6と両台座との隙間に所定のシールを設けて
密封構造とすることにより、転動体5付近への透水を防
止するのがよい。
The damper member 6 is formed in a ring shape as shown in FIG. 2 using, for example, high-damping rubber, and has an outer peripheral surface of the band plate 14 of the footing-side slide pedestal 4 and the pile-side slide pedestal 2. Between the inner peripheral surface of the band plate 12 and the inner peripheral surface. In addition, it is possible to prevent water permeation to the vicinity of the rolling element 5 by forming the damper member 6 itself from a water-stopping material and providing a predetermined seal in a gap between the member 6 and both pedestals to form a sealed structure. Good.

【0015】転動体5は、フーチング側摺動台座4およ
び杭側摺動台座2の間で軸力を伝達しつつ、それらの天
板13および底板11を摺動面として転動し、水平方向
の荷重を絶縁できるようになっている。なお、フーチン
グ側摺動台座4内にグリースを封入し、転動体5の防錆
を図るのがよい。
The rolling element 5 rolls with the top plate 13 and the bottom plate 11 as sliding surfaces while transmitting an axial force between the footing-side sliding pedestal 4 and the pile-side sliding pedestal 2 to move in the horizontal direction. Can be insulated. Grease is preferably sealed in the footing-side slide pedestal 4 to prevent the rolling elements 5 from rusting.

【0016】本実施形態に係る杭の免震構造において
は、杭1の頭部に取り付けられた杭側摺動台座2とフー
チング3の下面に取り付けられたフーチング側摺動台座
4との間に球状の転動体5を装填してあり、地震による
振動方向がいずれの方向であっても杭1とフーチング3
との相対移動が許容され、地盤から上部構造物に入力す
る地震エネルギー並びに上部構造物から杭頭に作用する
水平力や曲げモーメントは大幅に低減する。
In the seismic isolation structure for a pile according to the present embodiment, the pile-side sliding pedestal 2 attached to the head of the pile 1 and the footing-side sliding pedestal 4 attached to the lower surface of the footing 3. The pile 1 and the footing 3 are loaded with spherical rolling elements 5 regardless of the direction of vibration caused by the earthquake.
The seismic energy input from the ground to the superstructure and the horizontal force and bending moment acting on the pile head from the superstructure are greatly reduced.

【0017】また、両台座の間にリング状のダンパー部
材6を配設してあり、上部構造物およびフーチングの振
動エネルギーは、その振動方向がいずれの方向であって
も、図3に示すようにダンパー部材6で吸収される。
Further, a ring-shaped damper member 6 is disposed between the two pedestals, and the vibration energy of the upper structure and the footing can be obtained as shown in FIG. 3 regardless of the vibration direction. Is absorbed by the damper member 6.

【0018】以上説明したように、本実施形態の杭の免
震構造によれば、杭の頭部とフーチングの間に転動体を
配置したので、地盤から上部構造物に入力する地震エネ
ルギーが大幅にカットされ、上部構造物が免震化される
とともに、上部構造物から杭頭に作用する水平力や曲げ
モーメントも大幅に低減し、かくして、杭の破損を未然
に防止することができる。また、リング状のダンパー部
材を採用したので、上部構造物の振動をあらゆる振動方
向で減衰させることができる。
As described above, according to the seismic isolation structure for a pile of the present embodiment, the rolling elements are arranged between the head of the pile and the footing, so that the seismic energy input from the ground to the upper structure is greatly increased. The upper structure is seismically isolated, and the horizontal force and bending moment acting on the pile head from the upper structure are significantly reduced, thus preventing the pile from being damaged. Further, since the ring-shaped damper member is employed, the vibration of the upper structure can be attenuated in all vibration directions.

【0019】なお、いわゆる群杭の上にフーチングを設
置する場合には、これら各杭の頭部とフーチングの下面
に転動体等を配置する代わりに、図4に示すような構造
としてもよい。
When footings are installed on so-called group piles, a structure as shown in FIG. 4 may be used instead of arranging rolling elements or the like on the head of each pile and the lower surface of the footing.

【0020】すなわち、図4に示した杭の免震構造は、
群杭21上に設置されるフーチング3を該群杭21の頭
部に固定される下部フーチング22とその上方に配設さ
れる上部フーチング23とに分割形成して下部フーチン
グ22の上端と上部フーチング23の下端にそれぞれ下
部摺動台座24と上部摺動台座25を取り付け、該下部
摺動台座24と上部摺動台座25の間に球状の転動体5
を装填するとともに、該両台座間にダンパー部材6を配
設してある。
That is, the seismic isolation structure of the pile shown in FIG.
The footing 3 installed on the group pile 21 is divided into a lower footing 22 fixed to the head of the group pile 21 and an upper footing 23 disposed thereabove, and the upper end of the lower footing 22 and the upper footing 22 are formed. 23, a lower slide base 24 and an upper slide base 25 are respectively attached to the lower slide base 24 and the upper slide base 25.
And a damper member 6 is disposed between the pedestals.

【0021】下部摺動台座24は、杭側摺動台座2とほ
ぼ同様の構成であり、その下面に固着されたアンカー筋
15を下部フーチング22のコンクリート内に定着する
ことによって該下部フーチング22にしっかりと固定し
てある。同様に、上部摺動台座25は、フーチング側摺
動台座4とほぼ同様の構成であり、その上面に固着され
たアンカー筋17を上部フーチング23のコンクリート
内に定着することによって該上部フーチング23にしっ
かりと固定してある。
The lower slide pedestal 24 has substantially the same configuration as the pile-side slide pedestal 2, and the anchor bar 15 fixed to the lower surface of the lower slide pedestal 22 is fixed in the concrete of the lower footing 22 so as to be fixed to the lower footing 22. It is fixed firmly. Similarly, the upper slide pedestal 25 has substantially the same configuration as the footing-side slide pedestal 4, and the anchor stud 17 fixed to the upper surface thereof is fixed in the concrete of the upper footing 23, so that the upper footing 23 is fixed to the upper footing 23. It is fixed firmly.

【0022】かかる杭の免震構造においても、地震時に
おいては上部フーチング23と下部フーチング22との
相対移動が許容され、地盤から上部構造物に入力する地
震エネルギー並びに上部構造物から群杭21の頭部に作
用する水平力や曲げモーメントが大幅に低減し、上部構
造物の免震化および群杭の破損防止を図ることができる
とともに、リング状のダンパー部材6によって上部構造
物の振動をあらゆる振動方向で減衰させることができ
る。
In the seismic isolation structure of such a pile, the relative movement between the upper footing 23 and the lower footing 22 is allowed during an earthquake, and the seismic energy input from the ground to the upper structure and the group pile 21 from the upper structure are removed. The horizontal force and bending moment acting on the head are greatly reduced, seismic isolation of the upper structure and prevention of damage to the group piles can be achieved, and vibration of the upper structure can be reduced by the ring-shaped damper member 6 It can be attenuated in the vibration direction.

【0023】[0023]

【発明の効果】以上述べたように、請求項1に係る本発
明の杭の免震構造によれば、上部構造物からの水平力や
曲げモーメントによる群杭の破壊を未然に防止すること
ができる。
As described above, according to the seismic isolation structure for a pile according to the first aspect of the present invention, it is possible to prevent the group pile from being broken by a horizontal force or a bending moment from the upper structure. it can.

【0024】[0024]

【0025】[0025]

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

【図1】本実施形態に係る杭の免震構造を示した側面
図。
FIG. 1 is a side view showing a seismic isolation structure of a pile according to an embodiment.

【図2】同じく分解斜視図。FIG. 2 is an exploded perspective view of the same.

【図3】本実施形態に係る杭の免震構造の作用を示した
説明図。
FIG. 3 is an explanatory view showing the operation of the seismic isolation structure of the pile according to the embodiment.

【図4】本実施形態の変形例に係る杭の免震構造を示し
た側面図。
FIG. 4 is a side view showing a seismic isolation structure of a pile according to a modification of the embodiment.

【符号の説明】[Explanation of symbols]

1 杭 2 杭側摺動台座 3 フーチング 4 フーチング側摺動台座 5 転動体 6 ダンパー部材 21 群杭 22 下部フーチング 23 上部フーチング 24 下部摺動台座 25 上部摺動台座 DESCRIPTION OF SYMBOLS 1 Pile 2 Pile side sliding pedestal 3 Footing 4 Footing side sliding pedestal 5 Rolling element 6 Damper member 21 Group pile 22 Lower footing 23 Upper footing 24 Lower sliding pedestal 25 Upper sliding pedestal

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) E02D 27/12 E02D 27/34 E04H 9/02 331 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) E02D 27/12 E02D 27/34 E04H 9/02 331

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 群杭上に設置されるフーチングを該群杭
の頭部に固定される下部フーチングとその上方に配設さ
れる上部フーチングとに分割形成し、前記下部フーチン
グの上端にほぼ円形の底板の周囲に帯板を立設してなる
下部摺動台座を取り付けるとともに前記上部フーチング
の下端にほぼ円形の天板の周囲に帯板を立設してなる上
部摺動台座を取り付け、前記上部摺動台座の天板および
前記下部摺動台座の底板を摺動面として転動するように
球状の転動体を前記下部摺動台座と前記上部摺動台座と
の間に装填するとともに、前記上部摺動台座の帯板の外
側周面と前記下部摺動台座の帯板の内側周面との間にリ
ング状に形成されたダンパー部材を嵌め込んだことを特
徴とする杭の免震構造。
1. A footing installed on a group pile is divided into a lower footing fixed to the head of the group pile and an upper footing disposed above the lower part, and a substantially circular shape is formed at an upper end of the lower footing. Attach a lower slide pedestal with a band plate erected around the bottom plate and attach an upper slide pedestal with a band plate erected around a substantially circular top plate at the lower end of the upper footing. A spherical rolling element is loaded between the lower slide pedestal and the upper slide pedestal so as to roll with the top plate of the upper slide pedestal and the bottom plate of the lower slide pedestal as sliding surfaces, and A seismic isolation structure for a pile, wherein a ring-shaped damper member is fitted between the outer peripheral surface of the strip of the upper slide pedestal and the inner peripheral surface of the strip of the lower slide pedestal. .
JP7294831A 1995-10-17 1995-10-17 Seismic isolation structure of pile Expired - Fee Related JP3064887B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7294831A JP3064887B2 (en) 1995-10-17 1995-10-17 Seismic isolation structure of pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7294831A JP3064887B2 (en) 1995-10-17 1995-10-17 Seismic isolation structure of pile

Publications (2)

Publication Number Publication Date
JPH09111774A JPH09111774A (en) 1997-04-28
JP3064887B2 true JP3064887B2 (en) 2000-07-12

Family

ID=17812825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7294831A Expired - Fee Related JP3064887B2 (en) 1995-10-17 1995-10-17 Seismic isolation structure of pile

Country Status (1)

Country Link
JP (1) JP3064887B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4762618B2 (en) * 2005-06-30 2011-08-31 ジャパンパイル株式会社 Pile foundation structure and construction method
JP5877993B2 (en) * 2011-10-19 2016-03-08 鹿島建設株式会社 Pile head joint structure

Also Published As

Publication number Publication date
JPH09111774A (en) 1997-04-28

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