JPH09256644A - Existing building base isolation construction - Google Patents
Existing building base isolation constructionInfo
- Publication number
- JPH09256644A JPH09256644A JP6981096A JP6981096A JPH09256644A JP H09256644 A JPH09256644 A JP H09256644A JP 6981096 A JP6981096 A JP 6981096A JP 6981096 A JP6981096 A JP 6981096A JP H09256644 A JPH09256644 A JP H09256644A
- Authority
- JP
- Japan
- Prior art keywords
- footing
- existing building
- foundation
- pile head
- cut
- 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
Landscapes
- Foundations (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は既存建物の免震化工
法に関するものである。TECHNICAL FIELD The present invention relates to a seismic isolation method for existing buildings.
【０００２】[0002]
【従来の技術】既存建物の耐震性能を向上させる方法は
大きく分けて、建物の強度を増大させる方法と、建物の
固有周期を長くして地震入力を低減させる方法とがあ
る。前者の場合は耐力壁の増設や柱補強などによって行
い、また後者の場合は積層ゴム等の免震装置で建物を支
持することにより行っていた。2. Description of the Related Art Methods for improving seismic resistance of existing buildings are roughly classified into a method of increasing the strength of the building and a method of lengthening the natural period of the building to reduce seismic input. In the former case, it was done by adding bearing walls and column reinforcement. In the latter case, the building was supported by seismic isolation devices such as laminated rubber.
【０００３】[0003]
【発明が解決しようとする課題】しかし、耐力壁の増設
等による場合は使い勝手が悪くて現実的でない場合があ
った。一方、免震装置を設置する場合はその設置が難し
く、特に杭で支持された建物では一時的に建物荷重を仮
受けする方法が難しいという問題があった。However, in the case of adding a bearing wall or the like, there are cases in which the usability is poor and unrealistic. On the other hand, when a seismic isolation device is installed, it is difficult to install it, and particularly in a building supported by piles, it is difficult to temporarily receive the building load.
【０００４】本発明は、このような問題に鑑みてなされ
たものであり、その目的は、既存建物の耐震性能を容易
に向上させる建物の免震化工法を提供することである。The present invention has been made in view of the above problems, and an object thereof is to provide a seismic isolation method for a building that easily improves the seismic performance of an existing building.
【０００５】[0005]
【課題を解決するための手段】以上の課題を解決するた
めの手段は、杭で支持された既存建物における基礎部の
地盤を適宜深さ根切りして杭頭部を露出させ、該杭頭部
下側に上部フーチングから適宜離して下部フーチングを
形成し、該下部フーチングと上部フーチングとの間に仮
受け用ジャッキを設置して杭頭部を切断撤去し、該杭頭
部を切断撤去したところに免震装置を設置したことであ
り、前記基礎部の下側に地下部を構築したことである。[Means for Solving the Problems] Means for solving the above-mentioned problems are as follows: the foundation of a foundation in an existing building supported by piles is appropriately root-cut to expose the pile head, and the pile head is exposed. A lower footing is formed on the subordinate side so as to be appropriately separated from the upper footing, a jack for temporary reception is installed between the lower footing and the upper footing, and the pile head is cut and removed, and the pile head is cut and removed. A seismic isolation device was installed there, and an underground part was constructed below the foundation part.
【０００６】[0006]
【発明の実施の形態】以下、本発明の既存建物の免震化
工法の実施の形態の一例を図面に基づいて詳細に説明す
る。図１は本実施の形態の一例である既存建物１の下部
構造を示すものであり、図中の２が上部構造、同３が上
部構造２を支持する基礎である。上部構造２は複数階の
鉄筋コンクリート造（省略して図示せず）であり、基礎
３はフーチング４が杭５で支持されているとともに、各
フーチング４間に基礎梁６が架設されている。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the seismic isolation method for existing buildings of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a lower structure of an existing building 1 which is an example of the present embodiment. In the figure, 2 is an upper structure and 3 is a foundation for supporting the upper structure 2. The upper structure 2 is a reinforced concrete structure of a plurality of floors (omitted and not shown), and a footing 4 of a foundation 3 is supported by piles 5, and a foundation beam 6 is installed between each footing 4.
【０００７】このような既存建物１を免震化する方法
を、図２〜図５に基づいて説明する。まず、図２の
（１）に示すように、基礎３の周囲に親杭横矢板やシー
トパイル等の山留壁７を構築して根切りの準備をする。A method for seismically isolating the existing building 1 will be described with reference to FIGS. First, as shown in (1) of FIG. 2, a mountain retaining wall 7 such as a parent pile side sheet pile or a sheet pile is built around the foundation 3 to prepare for root cutting.
【０００８】次に、同図の（２）に示すように、山留壁
７で囲まれた基礎３の下部を所定の深さ根切りして上部
構造２を支持している杭５の頭部を露出させるととも
に、山留壁７をジャッキ８で支持して既存建物１の水平
方向を拘束する。この根切りは上部構造２の床スラブ９
と根切り底１０との間に人が入れる深さとし、作業者が
基礎梁６の下から入って根切り底１０に捨てコンクリー
ト１１を打設をする。この深さは必要に応じて変えるこ
とができる。そして露出された杭５の頭部の外周面を目
荒して複数のケミカルアンカー１２を打設する。Next, as shown in (2) of the same figure, the head of the pile 5 which supports the upper structure 2 by cutting the lower part of the foundation 3 surrounded by the mountain retaining wall 7 to a predetermined depth. While exposing the part, the mountain retaining wall 7 is supported by the jack 8 to restrain the existing building 1 in the horizontal direction. This root cutting is the floor slab 9 of superstructure 2
The depth is set between the and the root cutting bottom 10 by a person, and the worker enters from below the foundation beam 6 and throws the concrete 11 into the root cutting bottom 10. This depth can be varied as needed. Then, the exposed outer peripheral surface of the head of the pile 5 is roughened and a plurality of chemical anchors 12 are driven.
【０００９】次に、図３の（１）に示すように、前記ケ
ミカルアンカー１２の周囲にコンクリートを打設して上
部フーチング４から適宜離した下側に下部フーチング１
３を構築する。これらの下部フーチング１３間には下部
の基礎梁１４が、またこの基礎梁１４の内側には下部の
基礎スラブ１５がそれぞれ形成されて下部基礎１６が構
築されている。また山留壁７には内壁１７が構築されて
下部の基礎スラブ１５とともに地下部１８が形成されて
いる。そして下部フーチング１３の上面に４基の仮受け
用ジャッキ１９を設置して上部フーチング４を支持す
る。Next, as shown in (1) of FIG. 3, concrete is placed around the chemical anchor 12 and the lower footing 1 is placed below the upper footing 4 as appropriate.
Build 3. A lower foundation beam 14 is formed between the lower footings 13, and a lower foundation slab 15 is formed inside the foundation beam 14 to construct a lower foundation 16. An inner wall 17 is constructed on the mountain retaining wall 7 to form an underground portion 18 together with the lower foundation slab 15. Then, four temporary receiving jacks 19 are installed on the upper surface of the lower footing 13 to support the upper footing 4.
【００１０】次いで、同図の（２）に示すように、上部
フーチング４と下部フーチング１３との間の杭頭部をワ
イヤソーで切断して撤去する。Then, as shown in FIG. 2B, the pile head portion between the upper footing 4 and the lower footing 13 is cut with a wire saw and removed.
【００１１】次に、図４に示すように、杭頭部が撤去さ
れたところにそれに代わって免震装置２０を設置する。
これは仮受け用ジャッキ１９で既存建物１をジャッキア
ップするか、もしくはその位置を保持した状態で設置す
る。Next, as shown in FIG. 4, a seismic isolation device 20 is installed in place of the removed head of the pile.
This is carried out by jacking up the existing building 1 with the temporary receiving jack 19 or by installing the existing building 1 with its position maintained.
【００１２】そして、仮受け用ジャッキ１９を下部フー
チング１３から撤去することにより、図５に示すよう
に、上部フーチング４が免震装置２０で支持される。免
震装置２０としては、例えば、積層ゴムや、積層ゴムと
ダンパー（減衰装置）とが組み合わされたものが用いら
れる。By removing the temporary receiving jack 19 from the lower footing 13, the upper footing 4 is supported by the seismic isolation device 20, as shown in FIG. As the seismic isolation device 20, for example, laminated rubber or a combination of laminated rubber and a damper (damping device) is used.
【００１３】また免震装置２０を設置するために形成さ
れた地下部１８は、駐車場やその他の用途に使用され
る。Further, the underground portion 18 formed for installing the seismic isolation device 20 is used for a parking lot or other purposes.
【００１４】なお、下部フーチング１３の強度が不足す
る場合は、図６に示すように、アンボンド鋼線１２ａに
より柱に対する摩擦力を増大させて大きな付着力を発揮
させる。When the strength of the lower footing 13 is insufficient, as shown in FIG. 6, the unbonded steel wire 12a increases the frictional force against the column to exert a large adhesive force.
【００１５】[0015]
【発明の効果】杭で支持された既存建物における基礎部
の地盤を適宜深さ根切りして杭頭部を露出させ、該杭頭
部下側に上部フーチングから適宜離して下部フーチング
を形成し、該下部フーチングと上部フーチングとの間に
仮受け用ジャッキを設置して杭頭部を切断撤去し、該杭
頭部を切断撤去したところに免震装置を設置したことに
より、既存建物の免震化を容易に行うことができる。[Effects of the Invention] The foundation of the foundation of an existing building supported by piles is root-cut to a suitable depth to expose the pile head, and a lower footing is formed below the pile head and appropriately separated from the upper footing. By installing a jack for temporary reception between the lower footing and the upper footing to cut and remove the pile head, and by installing a seismic isolation device where the pile head was cut and removed, the existing building was isolated. Seismic can be done easily.
【００１６】基礎部の下側に構築した地下部を任意の用
途に利用することができる。The underground part built under the foundation can be used for any purpose.
【図１】既存建物の基礎の断面図である。FIG. 1 is a sectional view of a foundation of an existing building.
【図２】（１）は既存建物の基礎の一部省略断面図、
（２）は根切りした既存建物の基礎の一部省略断面図で
ある。[FIG. 2] (1) is a partially omitted sectional view of the foundation of an existing building,
(2) is a partially omitted sectional view of the foundation of an existing building that has been root-cut.
【図３】（１）は上部フーチングと下部フーチングとの
間に仮受け用ジャッキを設置した既存建物の基礎の断面
図、（２）は（１）のＡ−Ａ線断面図である。FIG. 3 (1) is a sectional view of a foundation of an existing building in which a temporary receiving jack is installed between an upper footing and a lower footing, and (2) is a sectional view taken along the line AA of (1).
【図４】免震装置を設置した既存建物の基礎の断面図で
ある。FIG. 4 is a cross-sectional view of a foundation of an existing building in which a seismic isolation device is installed.
【図５】免震化された既存建物の基礎の断面図である。FIG. 5 is a cross-sectional view of a foundation of an existing building that has been seismically isolated.
【図６】（１）はアンボンド鋼線を埋設した下部フーチ
ングの平面図、（２）は同正面図である。FIG. 6 (1) is a plan view of a lower footing in which an unbonded steel wire is embedded, and FIG. 6 (2) is a front view thereof.
１ 既存建物 ２ 上部構造 ３ 基礎 ４ 上部フーチング ５ 杭 ６ 基礎梁 ７ 山留壁 ８ ジャッキ ９ 床スラブ １０ 根切り底 １１ 捨てコンクリート １２ ケミカルアンカー １３ 下部フーチング 1 Existing Building 2 Upper Structure 3 Foundation 4 Upper Footing 5 Piles 6 Foundation Beam 7 Yamadome Wall 8 Jack 9 Floor Slab 10 Root Cutting Bottom 11 Discarded Concrete 12 Chemical Anchor 13 Lower Footing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中山 和美 東京都中央区京橋１−７−１ 戸田建設株 式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazumi Nakayama 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd.
Claims (2)
の地盤を適宜深さ根切りして杭頭部を露出させ、該杭頭
部下側に上部フーチングから適宜離して下部フーチング
を形成し、該下部フーチングと上部フーチングとの間に
仮受け用ジャッキを設置して杭頭部を切断撤去し、該杭
頭部を切断撤去したところに免震装置を設置したことを
特徴とする既存建物の免震化工法。1. A foundation foot of an existing building supported by piles is root-cut to an appropriate depth to expose a pile head, and a lower footing is formed below the pile head and appropriately separated from an upper footing. , An existing building characterized by installing a temporary receiving jack between the lower footing and the upper footing to cut and remove the pile head, and installing a seismic isolation device where the pile head is cut and removed Seismic isolation method.
とを特徴とする請求項１に記載の既存建物の免震化工
法。2. The seismic isolation construction method for an existing building according to claim 1, wherein an underground part is constructed below the foundation part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8069810A JP2989539B2 (en) | 1996-03-26 | 1996-03-26 | Existing building seismic isolation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8069810A JP2989539B2 (en) | 1996-03-26 | 1996-03-26 | Existing building seismic isolation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09256644A true JPH09256644A (en) | 1997-09-30 |
| JP2989539B2 JP2989539B2 (en) | 1999-12-13 |
Family
ID=13413496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8069810A Expired - Fee Related JP2989539B2 (en) | 1996-03-26 | 1996-03-26 | Existing building seismic isolation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989539B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000328585A (en) * | 1999-05-20 | 2000-11-28 | Shimizu Corp | Base isolating method |
| JP2001349065A (en) * | 2000-06-12 | 2001-12-21 | Takenaka Komuten Co Ltd | Underground base isolating construction method for existing building |
| JP2002348886A (en) * | 2001-05-24 | 2002-12-04 | Shimizu Corp | Composite pile |
| JP2006348690A (en) * | 2005-06-20 | 2006-12-28 | Takenaka Komuten Co Ltd | Retrofitting method for base isolation of existing building |
| JP2007063903A (en) * | 2005-09-01 | 2007-03-15 | Takenaka Komuten Co Ltd | Technique for reforming and constructing underfloor portion of hanging body of existing structure |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3950287B2 (en) * | 2000-08-01 | 2007-07-25 | 株式会社竹中工務店 | Construction method that reuses existing piles at the time of rebuilding and building structure that reuses existing piles |
| JP3622850B2 (en) * | 2002-01-17 | 2005-02-23 | 西松建設株式会社 | Cutting method of shaft structure |
-
1996
- 1996-03-26 JP JP8069810A patent/JP2989539B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000328585A (en) * | 1999-05-20 | 2000-11-28 | Shimizu Corp | Base isolating method |
| JP2001349065A (en) * | 2000-06-12 | 2001-12-21 | Takenaka Komuten Co Ltd | Underground base isolating construction method for existing building |
| JP4558145B2 (en) * | 2000-06-12 | 2010-10-06 | 株式会社竹中工務店 | Seismic isolation method for existing buildings |
| JP2002348886A (en) * | 2001-05-24 | 2002-12-04 | Shimizu Corp | Composite pile |
| JP2006348690A (en) * | 2005-06-20 | 2006-12-28 | Takenaka Komuten Co Ltd | Retrofitting method for base isolation of existing building |
| JP4624867B2 (en) * | 2005-06-20 | 2011-02-02 | 株式会社竹中工務店 | Seismic isolation repair method for existing buildings |
| JP2007063903A (en) * | 2005-09-01 | 2007-03-15 | Takenaka Komuten Co Ltd | Technique for reforming and constructing underfloor portion of hanging body of existing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2989539B2 (en) | 1999-12-13 |
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