JP2000328583A - Floating up damping mechanism for pile foundation - Google Patents
Floating up damping mechanism for pile foundationInfo
- Publication number
- JP2000328583A JP2000328583A JP11141407A JP14140799A JP2000328583A JP 2000328583 A JP2000328583 A JP 2000328583A JP 11141407 A JP11141407 A JP 11141407A JP 14140799 A JP14140799 A JP 14140799A JP 2000328583 A JP2000328583 A JP 2000328583A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- foundation
- head
- base plate
- earthquake
- 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.)
- Granted
Links
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- Foundations (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、構造物を支持す
る杭基礎の技術分野に属し、施工が容易で、地震時の杭
頭接合部の保護を図れ、且つエネルギー吸収の作用を奏
する、杭基礎の浮き上がり減衰機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a pile foundation for supporting a structure, which is easy to construct, protects a joint of a pile head during an earthquake, and has a function of absorbing energy. The present invention relates to an uplift damping mechanism for a foundation.
【０００２】[0002]
【従来の技術】 従来、図２に例示したように杭１…
で基礎版（基礎スラブ）２上の構造物５を支持する構造
の杭基礎は、杭頭と基礎版２との取り合い構造を図３に
例示したように行っている。即ち、杭１の頭部を基礎版
２の中へ少し食い込ませる（埋め込む）と共に、杭頭の
縦筋３を基礎版２の鉄筋篭（スラブ筋）４と一体化し、
構造的にがっちりと固定化するのが一般的である。実用
新案登録第３０１５３６１号の場合は、中空の杭頭部に
網篭を設置して基礎版中へ埋め込ませ、基礎版コンクリ
ートの打設によって固定し一体化している。2. Description of the Related Art Conventionally, as illustrated in FIG.
In the pile foundation having a structure for supporting the structure 5 on the foundation slab (foundation slab) 2, the connection structure between the pile head and the foundation slab 2 is performed as illustrated in FIG. 3. That is, the head of the pile 1 is slightly bitten (embedded) into the basic slab 2, and the vertical bar 3 of the pile head is integrated with the reinforcing bar (slab bar) 4 of the basic slab 2,
It is common to fix firmly in structure. In the case of Utility Model Registration No. 3015361, a mesh basket is installed at the head of a hollow pile, embedded in the foundation slab, and fixed and integrated by pouring the foundation slab concrete.
【０００３】 特開平８−３１１８８６号公報には、
杭頭の側面に減衰性能を有する合成化学材料を環状に配
置して、地震エネルギーは前記合成化学材料を圧縮して
減衰される構成の杭頭部免震システムが開示されてい
る。[0003] JP-A-8-31886 discloses that
A pile head seismic isolation system is disclosed in which a synthetic chemical material having damping performance is annularly arranged on a side surface of a pile head, and seismic energy is compressed and attenuated by the synthetic chemical material.
【０００４】[0004]
【本発明が解決しようとする課題】先の兵庫県南部地震
の杭基礎に関する被害状況は、杭頭部に集中しているこ
とが明かとなっている。これは地震時に上部構造物５に
作用するモーメント６に起因する引き抜き力Ｆ（図２）
によって杭頭接合部、及び杭体が破壊に至ったものと考
えられている。[Problems to be Solved by the Invention] It is clear that the damage situation related to the pile foundation in the previous Hyogoken Nanbu Earthquake is concentrated on the pile head. This is the pull-out force F caused by the moment 6 acting on the superstructure 5 during an earthquake (FIG. 2).
It is thought that the pile head joint and the pile body were destroyed by this.
【０００５】上述した従来技術のように、杭頭を基礎
版へ固定する考え方は、上部構造物５は基礎に固定する
ものとして設計が行われ、そうした条件を満足するため
の基礎設計が行われてきたことによる。[0005] As in the prior art described above, the idea of fixing the pile head to the foundation slab is such that the upper structure 5 is designed to be fixed to the foundation, and a basic design is performed to satisfy such conditions. It depends.
【０００６】しかし、杭頭を基礎版に固定するための施
工は、杭頭の処理、基礎版への埋め込み、杭頭の縦筋と
基礎版鉄筋（スラブ筋）との溶接による接合などに工数
がかかる上に、結局、完全な固定は至難であるとされて
いる。However, the work for fixing the pile head to the foundation slab involves man-hours such as treatment of the pile head, embedding in the foundation slab, and welding of the vertical reinforcement of the pile head and the reinforcing bar (slab reinforcement) of the foundation slab. In addition, complete fixation is considered to be extremely difficult.
【０００７】一方、大地震でも、通常の建物のプロポー
ションであれば転倒しないことは、多くの研究成果とし
て実証されている。そして、地震時に基礎版の浮き上が
りを許容すれば、地震入力を低減できることも知られて
いる。しかし、上記の技術のように基礎版に水平移動
（横ズレ）を許容する場合には、基礎版の浮き上がりは
発生せず、浮き上がりの許容による地震入力の低減を期
待できないこともまた知られている。[0007] On the other hand, it has been proven as a result of many studies that even a large earthquake does not fall if the proportion of a normal building is used. It is also known that if the base plate is lifted during an earthquake, the input of the earthquake can be reduced. However, it is also known that when the base plate is allowed to move horizontally (lateral deviation) as in the above technology, the base plate does not rise, and it is not expected to reduce the earthquake input by allowing the lift. I have.
【０００８】そこで、本発明の目的は、基礎版の水平移
動（横ズレ）は阻止し、逆に浮き上がりを許容して、地
震入力を低減する構成とした杭基礎の浮き上がり減衰機
構を提供することである。Accordingly, an object of the present invention is to provide a lifting damping mechanism for a pile foundation which is configured to prevent horizontal movement (lateral displacement) of a foundation plate and, on the contrary, allow lifting and reduce earthquake input. It is.
【０００９】本発明の次の目的は、施工が容易で、地震
時に受ける被害が少ない構造に改良した杭基礎の浮き上
がり減衰機構を提供することである。A second object of the present invention is to provide an improved damping mechanism for a pile foundation which is easy to construct and has a structure which is less likely to be damaged by an earthquake.
【００１０】[0010]
【課題を解決するための手段】上述の課題を解決するた
めの手段として、請求項１に記載した発明に係る杭基礎
の浮き上がり減衰機構は、杭基礎において、基礎版と杭
の頭部とが、杭頭に定着された弾塑性材にて連結されて
いることを特徴とする。Means for Solving the Problems As means for solving the above-mentioned problems, a floating damping mechanism for a pile foundation according to the present invention according to the first aspect of the present invention includes a pile foundation in which a foundation plate and a head of a pile are combined. And are connected by an elastic-plastic material fixed to the pile head.
【００１１】請求項２に記載した発明は、請求項１に記
載した杭基礎の浮き上がり減衰機構において、弾塑性材
は極軟鋼ボルトであり、基礎版の表面部から突き出た部
位にナットがねじ込まれ締結されていることを特徴とす
る。According to a second aspect of the present invention, in the lift-up damping mechanism for a pile foundation according to the first aspect, the elasto-plastic material is an ultra-mild steel bolt, and a nut is screwed into a portion protruding from the surface of the foundation plate. It is characterized by being fastened.
【００１２】[0012]
【発明の実施の形態】図１は、請求項１及び２記載の発
明に係る杭基礎の浮き上がり減衰機構の実施形態を示し
ている。FIG. 1 shows an embodiment of a floating damping mechanism for a pile foundation according to the first and second aspects of the present invention.
【００１３】杭１の頭部に、アンカー部材７によって水
平なベースプレート８が一体的に定着され、同ベースプ
レート８の上面に下端を溶接等で固着された、降伏点が
低い、または弾塑性域が広い材料、例えば極軟鋼により
製作した連結用ボルト９が鉛直に立てられている。そし
て、基礎版２の表面上に突出された前記連結用ボルト９
の上端部に、台座１０を置いてナット１１がねじ込まれ
強く締結して、基礎版２と杭１の頭部とが連結用ボルト
９（極軟鋼）の塑性ばねにより連結されている。ベース
プレート８は基礎版２には埋め込まれない。A horizontal base plate 8 is integrally fixed to the head of the pile 1 by an anchor member 7, and the lower end is fixed to the upper surface of the base plate 8 by welding or the like. The yield point is low or the elasto-plastic region is low. A connecting bolt 9 made of a wide material, for example, extremely mild steel, stands upright. Then, the connecting bolt 9 protruding on the surface of the base plate 2
A pedestal 10 is placed on the upper end of the slab, and a nut 11 is screwed into the base plate 2 and fastened tightly. The base plate 2 and the head of the pile 1 are connected by a plastic spring of a connecting bolt 9 (extremely mild steel). The base plate 8 is not embedded in the base plate 2.
【００１４】杭１は、既成コンクリート杭、鋼管杭、或
いは現場打ちコンクリート杭の別を問わない。連結用ボ
ルト９の材質は、基礎版２の横滑りを防ぐだけの剪断抵
抗力をもち、基礎版２の浮き上がりを許容して塑性変形
を生じエネルギー吸収の実効性を奏するものであれば良
く、その如何を問わない。例えば鋼棒であっても、基礎
版２の浮き上がり時の引き抜き力Ｆ（図２）に対して降
伏する断面積に設計することによっても実施可能であ
る。The pile 1 may be an existing concrete pile, a steel pipe pile, or a cast-in-place concrete pile. The material of the connection bolt 9 may be any material that has a shearing resistance enough to prevent the base plate 2 from skidding, and that allows the base plate 2 to lift up and undergoes plastic deformation to exhibit the effect of energy absorption. It doesn't matter. For example, even a steel bar can be implemented by designing the cross-sectional area to yield with respect to the pulling force F (FIG. 2) when the base plate 2 rises.
【００１５】本発明の浮き上がり減衰機構によれば、地
震時の基礎版２の横滑り（水平変位）に対しては、連結
用ボルト９が一種のシアキーとして抵抗し基礎版２と杭
頭との間で剪断力を伝達して阻止する。その故に発生す
る基礎版２の浮き上がりは、連結用ボルト９の降伏と弾
塑性変形とによって許容し、その際に地震エネルギーを
吸収して減衰効果（ダンパー効果）を奏するのである。
地震後には、緩んだナット１１を締めなおして修復す
る。According to the floating damping mechanism of the present invention, the connecting bolt 9 acts as a kind of shear key against the side slip (horizontal displacement) of the basic slab 2 at the time of an earthquake, and a gap between the basic slab 2 and the pile head is formed. Transmits the shearing force to prevent it. Therefore, the lifting of the base plate 2 caused by the yield of the connecting bolt 9 and the elasto-plastic deformation is allowed. At that time, the damping effect (damper effect) is exerted by absorbing the seismic energy.
After the earthquake, the loosened nuts 11 are tightened and repaired.
【００１６】上述のように、本発明の浮き上がり減衰機
構は、地震力に対してフレキシブルな挙動を呈するの
で、その分負荷が軽減されて破壊を免れる効果もある。As described above, the lift damping mechanism of the present invention exhibits a flexible behavior against seismic force, and therefore has the effect of reducing the load and preventing breakage.
【００１７】しかも、本発明の浮き上がり減衰機構は、
杭頭に連結用ボルト９を備えた杭１を施工した後、基礎
版２を施工し、そのコンクリートが強度を発現した後
に、連結用ボルト９へナット１１をねじ込む手順で容易
に施工でき、施工性にも優れるのである。Further, the floating damping mechanism of the present invention
After constructing the pile 1 provided with the connecting bolts 9 at the pile head, the foundation slab 2 is constructed, and after the concrete has developed strength, the nut 11 can be easily screwed into the connecting bolts 9 to perform the construction. It is also excellent in nature.
【００１８】[0018]
【本発明が奏する効果】請求項１及び２に記載した発明
に係る杭基礎の浮き上がり減衰機構は、基礎版の水平移
動（横ズレ）は阻止し、浮き上がりを許容して、地震入
力を低減する減衰効果（ダンパー効果）を奏する。According to the first and second aspects of the present invention, the uplift damping mechanism for a pile foundation prevents horizontal movement (lateral displacement) of a foundation slab, allows uplift, and reduces earthquake input. It has a damping effect (damper effect).
【００１９】また、本発明の浮き上がり減衰機構は、施
工が容易で、地震時に受ける被害が少ない構造でもあ
る。Further, the lift damping mechanism of the present invention is a structure that is easy to construct and suffers less damage during an earthquake.
【図１】本発明の浮き上がり減衰機構の実施形態を示し
た断面図である。FIG. 1 is a sectional view showing an embodiment of a floating damping mechanism of the present invention.
【図２】杭基礎構造物の地震時の作用力を説明した立面
図である。FIG. 2 is an elevation view illustrating an acting force of the pile foundation structure during an earthquake.
【図３】従来の杭基礎の杭頭部の納まりを示した断面図
である。FIG. 3 is a sectional view showing a pile head of a conventional pile foundation.
１ 杭 ２ 基礎版 ７ アンカー部材 ９ 連結用ボルト １１ ナット DESCRIPTION OF SYMBOLS 1 Pile 2 Base plate 7 Anchor member 9 Connecting bolt 11 Nut
フロントページの続き (72)発明者 岩下 敬三 千葉県印西市大塚一丁目５番地１ 株式会 社竹中工務店技術研究所内 (72)発明者 上林 厚志 千葉県印西市大塚一丁目５番地１ 株式会 社竹中工務店技術研究所内 Ｆターム(参考） 2D046 CA03 DA11 Continuing from the front page (72) Inventor Keizo Iwashita 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Atsushi Uebayashi 1-5-1, Otsuka 1, Inzai City, Chiba Prefecture Stock Company F-term in Takenaka Corporation Technical Research Institute (reference) 2D046 CA03 DA11
Claims (2)
杭頭に定着された鉛直方向の弾塑性材を介して連結され
ていることを特徴とする、杭基礎の浮き上がり減衰機
構。(1) In a pile foundation, a foundation plate and a head of a pile are:
A lifting damping mechanism for a pile foundation, which is connected via a vertical elastic-plastic material fixed to a pile head.
表面部から突き出た部位にナットがねじ込まれ締結され
ていることを特徴とする、請求項１に記載した杭基礎の
浮き上がり減衰機構。2. The pile damping uplift dam according to claim 1, wherein the elasto-plastic material is an ultra-mild steel bolt, and a nut is screwed into a portion protruding from the surface of the base plate and fastened. mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14140799A JP3823243B2 (en) | 1999-05-21 | 1999-05-21 | Lifting damping mechanism of pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14140799A JP3823243B2 (en) | 1999-05-21 | 1999-05-21 | Lifting damping mechanism of pile foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000328583A true JP2000328583A (en) | 2000-11-28 |
| JP3823243B2 JP3823243B2 (en) | 2006-09-20 |
Family
ID=15291300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14140799A Expired - Fee Related JP3823243B2 (en) | 1999-05-21 | 1999-05-21 | Lifting damping mechanism of pile foundation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3823243B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003261946A (en) * | 2002-03-12 | 2003-09-19 | Taisei Corp | Supporting structure of concrete-construction foundation |
| CN104294823A (en) * | 2014-10-13 | 2015-01-21 | 安徽天筑建设（集团）有限公司 | Anti-floating pile structure of pre-stressed pipe pile and construction method |
| JP2019218795A (en) * | 2018-06-22 | 2019-12-26 | 大成建設株式会社 | Joint structure of foundation pile and foundation slab |
| JP2020193553A (en) * | 2019-05-22 | 2020-12-03 | 五洋建設株式会社 | Head joint structure and joint method for pile columnar bodies |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576497B (en) * | 2020-05-15 | 2021-07-23 | 江苏邗建集团有限公司 | Construction method of anti-floating anchor rod applied to underground space |
-
1999
- 1999-05-21 JP JP14140799A patent/JP3823243B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003261946A (en) * | 2002-03-12 | 2003-09-19 | Taisei Corp | Supporting structure of concrete-construction foundation |
| CN104294823A (en) * | 2014-10-13 | 2015-01-21 | 安徽天筑建设（集团）有限公司 | Anti-floating pile structure of pre-stressed pipe pile and construction method |
| CN104294823B (en) * | 2014-10-13 | 2016-08-24 | 杭州江润科技有限公司 | A kind of construction method of pile for prestressed pipe anti-floating pile raft structure |
| JP2019218795A (en) * | 2018-06-22 | 2019-12-26 | 大成建設株式会社 | Joint structure of foundation pile and foundation slab |
| JP7028728B2 (en) | 2018-06-22 | 2022-03-02 | 大成建設株式会社 | Joint structure of foundation pile and foundation slab |
| JP2020193553A (en) * | 2019-05-22 | 2020-12-03 | 五洋建設株式会社 | Head joint structure and joint method for pile columnar bodies |
| JP7307670B2 (en) | 2019-05-22 | 2023-07-12 | 五洋建設株式会社 | Pile column head joint structure and joint method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3823243B2 (en) | 2006-09-20 |
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