JP2819008B2 - Existing building seismic isolation method - Google Patents
Existing building seismic isolation methodInfo
- Publication number
- JP2819008B2 JP2819008B2 JP11800295A JP11800295A JP2819008B2 JP 2819008 B2 JP2819008 B2 JP 2819008B2 JP 11800295 A JP11800295 A JP 11800295A JP 11800295 A JP11800295 A JP 11800295A JP 2819008 B2 JP2819008 B2 JP 2819008B2
- Authority
- JP
- Japan
- Prior art keywords
- existing building
- foundation
- seismic isolation
- pile
- flat slab
- 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 - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、既存建物を免震化する
ための構法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for seismic isolation of an existing building.
【０００２】[0002]
【従来の技術】最近発生した阪神大地震においては、耐
震設計となっているにもかかわらず多くの建物が損壊
し、このため、既存の建物、特に病院や集合住宅あるい
は公共施設など、人が多く集まる建物については早急に
地震対策を施す必要に迫られている。ところで、地震周
期を長周期化して建物に伝える免震装置が、建物の保護
に極めて有効であることが前出の阪神大地震でも確認さ
れており、既存の建物についてもこの免震装置を利用し
て免震化することが検討されている。2. Description of the Related Art In the recent Great Hanshin Earthquake, many buildings have been damaged in spite of their seismic design, which has led to the loss of existing buildings, especially hospitals, apartment buildings and public facilities. Buildings that gather in large numbers are urgently required to take measures against earthquakes. By the way, it was confirmed that the seismic isolation device, which extends the earthquake cycle to the building and transmits it to the building, was extremely effective in protecting the building even in the Hanshin Earthquake mentioned above, and this seismic isolation device was also used for existing buildings. It is being studied to make it seismically isolated.
【０００３】図３は、免震装置１を用いて既存の建物２
を免震化する１つの考え方を示したもので、既存の建物
２をジャッキ等で支持して、その地下部分に基礎３と基
礎梁４とを構築し、基礎３上に前記免震装置１を載置固
定して、この免震装置１上に既存建物２を据え付けるよ
うにするものである。なお、杭５がある場合は、この杭
５上に基礎３を構築する。FIG. 3 shows an existing building 2 using a seismic isolation device 1.
This shows an idea of seismic isolation of an existing building 2. An existing building 2 is supported by jacks or the like, a foundation 3 and a foundation beam 4 are constructed under the base, and the seismic isolation device 1 is installed on the foundation 3. Is mounted, and the existing building 2 is installed on the seismic isolation device 1. If there is a pile 5, the foundation 3 is constructed on the pile 5.
【０００４】[0004]
【発明が解決しようとする課題】 しかしながら、上記
考え方によれば、既存の建物２の地下部分または半地下
部分に上記基礎梁４が縦横に配置されるため、この基礎
梁４が作業空間を著しく狭くし、機械（ジャッキ等）の
搬入や作業者の動きを困難にして、思うほど簡単に既存
建物を免震化できないという問題があった。However, according to the above concept, since the foundation beams 4 are arranged vertically and horizontally in the underground part or semi-underground part of the existing building 2, this foundation
The beam 4 significantly narrows the working space, making it difficult to carry in machines (jacks and the like) and moving the workers, and there was a problem that the existing building could not be easily seismically isolated.
【０００５】本発明は、上記背景に鑑みてなされたもの
で、その課題とするところは、地下部分の作業空間を広
げて、既存の建物を簡単に免震化できるようにすること
にある。[0005] The present invention has been made in view of the above background, and an object of the present invention is to expand an underground work space so that an existing building can be easily made seismically isolated.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、既存建物の地下部分を所定深さ掘削した
後、その掘削底に厚肉のフラットスラブを打設し、次に
前記フラットスラブを足場として前記既存建物の基礎を
支承し、しかる後に前記基礎の下方に支柱を構築し、さ
らに前記支柱と前記基礎との間に免震装置を介装するよ
うに構成したことを特徴とする。In order to solve the above-mentioned problems, according to the present invention, after excavating an underground portion of an existing building to a predetermined depth, a thick flat slab is cast on the excavated bottom, and The flat slab is used as a scaffold to support the foundation of the existing building, and then a support is constructed below the foundation, and furthermore, a seismic isolation device is interposed between the support and the foundation. And
【０００７】本発明において、上記既存建物の地下部分
を掘削するに際しては、所望の生活空間を確保するに足
る深さとなるように掘削するのが望ましい。また、上記
免震装置としては、ゴム板と鉄板とを交互に積層した積
層体を用いるのが望ましい。In the present invention, when excavating the underground portion of the above-mentioned existing building, it is desirable to excavate the excavation so as to have a depth sufficient to secure a desired living space. In addition, as the seismic isolation device, it is desirable to use a laminate in which rubber plates and iron plates are alternately laminated.
【０００８】本発明はまた、既存建物の地下部分を所定
深さ掘削した後、その掘削底に厚肉のフラットスラブを
打設し、次に前記フラットスラブを足場として前記既存
建物の基礎を支承し、しかる後に前記基礎を支持する既
存の杭の上端部を撤去すると共に、前記基礎の下方に、
前記掘削範囲に露出した前記杭の上部分を鉄筋コンクリ
ートで包みながら支柱を構築し、さらに前記支柱と前記
基礎との間に、ゴム板と鉄板とを交互に積層してなる積
層体を介装する構成とすることができる。この際、上記
杭が鉄筋コンクリートからなる場合は、支柱を構築する
前に該杭の表面をはつって鉄筋を露出させておくのが望
ましい。According to the present invention, after excavating a basement portion of an existing building to a predetermined depth, a thick flat slab is cast on the excavated bottom, and then the foundation of the existing building is supported using the flat slab as a scaffold. Then, after removing the upper end of the existing pile supporting the foundation, and below the foundation,
A strut is constructed by wrapping the upper part of the pile exposed in the excavation area with reinforced concrete, and a laminate formed by alternately laminating a rubber plate and an iron plate is interposed between the strut and the foundation. It can be configured. At this time, if the pile is made of reinforced concrete, it is desirable to expose the rebar by removing the surface of the pile before constructing the pillar.
【０００９】[0009]
【作用】上記のように構成した免震化構法においては、
既存建物の地下部分を掘削すると共にその掘削底にフラ
ットスラブを打設することで、該地下部分に基礎梁のよ
うな障害物のない大きな作業空間を確保することができ
る。[Function] In the seismic isolation construction method configured as described above,
By excavating the underground part of the existing building and placing a flat slab on the excavated bottom, a large work space without obstacles such as foundation beams can be secured in the underground part.
【００１０】また、地下部分を所望の生活空間を確保す
るに足る深さに掘削する場合は、地下部分を住居、事務
所、倉庫、駐車場等の多目的の生活空間として利用する
ことができる。また、免震装置としてゴム板と鉄板とを
交互に積層した積層体を用いる場合は、支柱上に積層体
を載置固定するだけでよく、施工は簡単となる。さら
に、既存建物の基礎が杭に支持されている場合は、この
杭を支柱に包むことで強度の大きい支柱を構築できる。When the underground part is excavated to a depth sufficient to secure a desired living space, the underground part can be used as a multipurpose living space such as a house, an office, a warehouse, and a parking lot. Further, when a laminated body in which rubber plates and iron plates are alternately laminated is used as the seismic isolation device, it is only necessary to mount and fix the laminated body on the column, and the construction is simplified. Further, when the foundation of the existing building is supported by a pile, the pile can be wrapped in a pillar to form a strong pillar.
【００１１】[0011]
【実施例】以下、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１２】図１および２において、１１は既存建物１
０の柱で、地中に打ち込んだ複数の杭１２上に配置した
基礎１３に支持されている。基礎１３は、柱１１に対応
して複数設けられて、それぞれの相互間に縦横に橋架し
た基礎梁１４により補強されている。本実施例におい
て、前記基礎１３は半地下部分に構築されており、地表
面Ａ（図２）が基礎１３の厚さ方向の中間に位置決めさ
れている。なお、１５は既存建物１０の１階フロアとし
て用いられる１階スラブであり、前記基礎梁１４によっ
て支持されている。1 and 2, reference numeral 11 denotes an existing building 1.
It is supported by a foundation 13 arranged on a plurality of piles 12 driven into the ground with zero columns. A plurality of foundations 13 are provided corresponding to the columns 11, and are reinforced by foundation beams 14 which are bridged vertically and horizontally between each other. In this embodiment, the foundation 13 is constructed in a semi-underground part, and the ground surface A (FIG. 2) is positioned at the middle of the foundation 13 in the thickness direction. Reference numeral 15 denotes a first-floor slab used as a first-floor floor of the existing building 10, which is supported by the foundation beam 14.
【００１３】上記既存建物１０を免震化するに際して
は、先ず図２に示すように、既設建物１０の地下部分を
掘削して、地表面Ａから所定深さＨだけ掘り下げた地下
空間Ｂをつくる。地下空間Ｂの深さＨは、後述するフラ
ットスラブ１６を打設してもなお、所望の生活空間を確
保するに足る十分な深さとする。この掘削により、地下
空間Ｂには基礎１３および基礎梁１４を始め、杭１２の
上部分が露出するが、杭１２は地中深く打ち込まれてい
るので、該杭１２に変形が生じることはなく、既設建物
１０が沈下することもない。When the existing building 10 is to be isolated from the ground, first, as shown in FIG. 2, an underground portion of the existing building 10 is excavated to form an underground space B dug from the ground surface A by a predetermined depth H. . The depth H of the underground space B is set to a depth sufficient to secure a desired living space even when a flat slab 16 described later is cast. By this excavation, the upper part of the pile 12 including the foundation 13 and the foundation beam 14 is exposed in the underground space B. However, since the pile 12 is driven deep into the ground, the pile 12 is not deformed. The existing building 10 does not sink.
【００１４】次に、上記地下空間Ｂ内に露出した杭１２
の下側部分に周方向に等配して複数の***を穿設し、各
***にスタッドボルト１７を植立する。続いて、地下空
間Ｂの底に、いわゆる捨てコンクリートを打って薄肉の
床１８を造成し、さらにこの床１８上に前記フラットス
ラブ１６を打設する。フラットスラブ１６は、鉄筋コン
クリートからなるもので、大きな強度を有するように厚
肉（一例として 500〜1000mm）に打設される。そして、
その打設と共に前記スタッドボルト１７がフラットスラ
ブ１６に埋め込まれ、杭１２は、このフラットスラブ１
６にも補強されてより一層安定する。Next, the pile 12 exposed in the underground space B
A plurality of small holes are drilled in the lower part of the body in the circumferential direction and stud bolts 17 are erected in each small hole. Subsequently, a so-called discarded concrete is cast on the bottom of the underground space B to form a thin-walled floor 18, and the flat slab 16 is cast on the floor 18. The flat slab 16 is made of reinforced concrete, and is cast into a thick wall (for example, 500 to 1000 mm) so as to have a large strength. And
The stud bolt 17 is embedded in the flat slab 16 with the driving, and the pile 12 is
6 is further reinforced.
【００１５】その後、上記地下空間Ｂ内に複数のジャッ
キ２０と複数の上、下架設フレーム２１，２２とを搬入
する。この際、地下空間Ｂの底はフラットスラブ１６に
より平坦面となっているので、ジャッキ２０や上、下架
設フレーム２１，２２の搬入が容易となり、作業性が著
しく向上する。そして、基礎１３の下面に当接させた上
架設フレーム２１とフラットスラブ１６上に載置した下
架設フレーム２２との間に複数のジャッキ２０を介装
し、これらジャッキ２０を同期して作動させて、フラッ
トスラブ１６を足場（反力受け）として基礎１３から上
の既設建物１０を沈下しないように支持する。フラット
スラブ１６は、上記したように十分なる強度を有してい
るので、既存建物１０の荷重が加わってもこれに十分に
耐えるものとなり、既存建物１０をジャッキ２０を用い
て安定して支持できる。なお、このジャッキ２０による
支持に際しては、上、下架設フレーム２１と２２とをブ
レース２３等で連結して、水平力に対する抵抗を高める
ようにしてもよい。Thereafter, a plurality of jacks 20 and a plurality of upper and lower frames 21 and 22 are carried into the underground space B. At this time, the bottom of the underground space B has a flat surface with the flat slab 16, so that the jack 20, the upper and lower erected frames 21, 22 can be easily carried in, and workability is remarkably improved. Then, a plurality of jacks 20 are interposed between the upper erected frame 21 abutting on the lower surface of the foundation 13 and the lower erected frame 22 placed on the flat slab 16, and these jacks 20 are operated in synchronization. Thus, the existing building 10 above the foundation 13 is supported so as not to sink by using the flat slab 16 as a scaffold (reaction force receiving). Since the flat slab 16 has sufficient strength as described above, the flat slab 16 can sufficiently withstand the load of the existing building 10 even when the load is applied, and the existing building 10 can be stably supported using the jack 20. . When the jack 20 is supported, the upper and lower frames 21 and 22 may be connected by a brace 23 or the like so as to increase the resistance to horizontal force.
【００１６】次に、図１に示すように、地下空間Ｂ内に
露出している杭１２の上端部を所定の範囲にわたって撤
去し、さらにこの撤去後に地下空間Ｂに露出している杭
１２の上部分の表面コンクリート１２ａをはつり、内部
の鉄筋１２ｂを露出させる。次に、前記杭１２の鉄筋１
２ｂの周りに鉄筋コンクリートを打設して、該鉄筋１２
ｂを包む支柱２４を構築し、続いて、この支柱２４と上
記基礎１３との間に免震装置としての積層体２５をセッ
トする。その後、ジャッキ２０を短縮させて積層体２５
上に基礎１３と共に既存建物１０を載せ、さらに積層体
２５の周りを弾性変形可能な耐火材料製のカバー２６で
覆う。なお、積層体２５は支柱２４に対して、例えばア
ンカーボルトを用いて固定される。Next, as shown in FIG. 1, the upper end of the pile 12 exposed in the underground space B is removed over a predetermined range, and the pile 12 exposed in the underground space B after this removal is removed. The upper surface concrete 12a is peeled off to expose the inner reinforcing bar 12b. Next, the reinforcing bar 1 of the pile 12
2b, reinforced concrete is cast around the reinforcing bar 12b.
A support 24 enclosing b is constructed, and a laminate 25 as a seismic isolation device is set between the support 24 and the foundation 13. Thereafter, the jack 20 is shortened and the laminated body 25
The existing building 10 is placed on the foundation 13 together with the foundation 13, and the laminate 25 is covered with a cover 26 made of a refractory material that can be elastically deformed. The laminate 25 is fixed to the support 24 using, for example, anchor bolts.
【００１７】そして、上記した作業を、既存建物１０の
各基礎１３（柱１１）に対して順次行い、これにて既存
建物１０の免震化は完了する。しかして、地下空間Ｂ
は、十分なる深さを有しかつフラットスラブ１６により
平坦底となっているので、住居、事務所、倉庫、駐車場
等の多目的の地下室として利用することができる。ま
た、本実施例では特に、支柱２４に既存の杭１２を包ん
でいるので、支柱２４の強度が著しく高まり、耐久信頼
性が向上する。The above-described operation is sequentially performed on each foundation 13 (column 11) of the existing building 10, and the seismic isolation of the existing building 10 is completed. Then, underground space B
Since it has a sufficient depth and has a flat bottom by the flat slab 16, it can be used as a multipurpose basement such as a house, an office, a warehouse, and a parking lot. Further, in the present embodiment, particularly, since the existing stake 12 is wrapped around the column 24, the strength of the column 24 is significantly increased, and the durability reliability is improved.
【００１８】なお、本発明は、上記杭１２を有しない基
礎１３に対しても適用可能であることはもちろんで、こ
の場合は、各基礎１３下の地盤を残してその周りを掘削
し、基礎１３をジャッキ２０で支持した後、基礎１３下
の地盤を掘削して支柱２４を構築する。また、本発明
は、既存建物を一端移動させた後に元に戻す、いわゆる
曳き屋構法にも適用可能で、この場合は、地下部分をよ
り容易に掘削することができて、工事が短時間で済む。It should be noted that the present invention can be applied to a foundation 13 not having the piles 12, and in this case, excavating around the ground while leaving the ground under each foundation 13, After the support 13 is supported by the jack 20, the ground under the foundation 13 is excavated to construct the column 24. In addition, the present invention can be applied to a so-called pulling house construction method in which an existing building is once moved and then restored, in which case the underground portion can be excavated more easily, and the construction can be performed in a short time. I'm done.
【００１９】[0019]
【発明の効果】以上、詳細に説明したように、本発明に
かゝる既存建物の免震化構法によれば、既存建物の地下
部分を掘削すると共にその掘削底にフラットスラブを打
設するようにしたので、該地下部分に基礎梁のような障
害物のない大きな作業空間を確保することができ、施工
性が著しく向上して、比較的簡単に既存建物を免震化で
きる。また、地下部分を所望の生活空間を確保するに足
る深さに掘削することにより、多目的の地下室として利
用することも可能となり、利用価値は増大する。As described above in detail, according to the seismic isolation method for an existing building according to the present invention, an underground portion of the existing building is excavated and a flat slab is cast on the excavated bottom. As a result, a large work space free of obstacles such as foundation beams can be secured in the underground part, workability can be significantly improved, and the existing building can be relatively easily seismically isolated. In addition, by excavating the underground part to a depth sufficient to secure a desired living space, it becomes possible to use the basement as a multipurpose basement, and the utility value increases.
【図１】本発明にかゝる既存建物の免震化構法の最終段
階を示す断面図である。FIG. 1 is a sectional view showing the final stage of a seismic isolation construction method for an existing building according to the present invention.
【図２】本免震化構法の中間段階を示す断面図である。FIG. 2 is a sectional view showing an intermediate stage of the seismic isolation construction method.
【図３】新築建物に対する免震装置の利用態様を示す断
面図である。FIG. 3 is a cross-sectional view illustrating a use mode of a seismic isolation device for a newly-built building.
１０ 既存建物 １２ 杭 １２ｂ 杭の鉄筋 １３ 基礎 １４ 基礎梁 １６ フラットスラブ ２０ ジャッキ ２４ 支柱 ２５ 積層体（免震装置） DESCRIPTION OF SYMBOLS 10 Existing building 12 Pile 12b Pile reinforcing bar 13 Foundation 14 Foundation beam 16 Flat slab 20 Jack 24 Prop 25 Laminate (seismic isolation device)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−20767（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 27/34──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-20767 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) E02D 27/34
Claims (5)
後、その掘削底に厚肉のフラットスラブを打設し、次に
前記フラットスラブを足場として前記既存建物の基礎を
支承し、しかる後に前記基礎の下方に支柱を構築し、さ
らに前記支柱と前記基礎との間に免震装置を介装するこ
とを特徴とする既存建物の免震化構法。After excavating a basement portion of an existing building to a predetermined depth, a thick flat slab is cast on the excavated bottom, and then the foundation of the existing building is supported using the flat slab as a scaffold. A seismic isolation method for an existing building, wherein a post is constructed below the foundation, and a seismic isolation device is interposed between the post and the foundation.
を確保するに足る深さに掘削することを特徴とする請求
項１に記載の既存建物の免震化構法。2. The seismic isolation method for an existing building according to claim 1, wherein the underground portion of the existing building is excavated to a depth sufficient to secure a desired living space.
に積層した積層体を用いることを特徴とする請求項１ま
たは２に記載の既存建物の免震化構法。3. The seismic isolation method for an existing building according to claim 1, wherein a laminated body in which rubber plates and iron plates are alternately laminated is used as the seismic isolation device.
後、その掘削底に厚肉のフラットスラブを打設し、次に
前記フラットスラブを足場として前記既存建物の基礎を
支承し、しかる後に前記基礎を支持する既存の杭の上端
部を撤去すると共に、前記基礎の下方に、前記掘削範囲
に露出した前記杭の上部分を鉄筋コンクリートで包みな
がら支柱を構築し、さらに前記支柱と前記基礎との間
に、ゴム板と鉄板とを交互に積層してなる積層体を介装
することを特徴とする既存建物の免震化構法。4. Excavating the underground portion of the existing building to a predetermined depth, placing a thick flat slab on the excavated bottom, and then supporting the foundation of the existing building using the flat slab as a scaffold. Later, while removing the upper end of the existing pile supporting the foundation, a column is constructed below the foundation while wrapping the upper part of the pile exposed to the excavation area with reinforced concrete, and furthermore, the column and the foundation are further constructed. A method of seismic isolation of an existing building, characterized by interposing a laminate consisting of rubber and iron plates alternately stacked between the two.
構築する前に該杭の表面をはつって鉄筋を露出させるこ
とを特徴とする請求項４に記載の既存建物の免震化構
法。5. The seismic isolation method for an existing building according to claim 4, wherein the pile is made of reinforced concrete, and the reinforcing bar is exposed by peeling off the surface of the pile before constructing the column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11800295A JP2819008B2 (en) | 1995-04-19 | 1995-04-19 | Existing building seismic isolation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11800295A JP2819008B2 (en) | 1995-04-19 | 1995-04-19 | Existing building seismic isolation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08284177A JPH08284177A (en) | 1996-10-29 |
| JP2819008B2 true JP2819008B2 (en) | 1998-10-30 |
Family
ID=14725629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11800295A Expired - Lifetime JP2819008B2 (en) | 1995-04-19 | 1995-04-19 | Existing building seismic isolation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2819008B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6441029B2 (en) * | 2014-11-05 | 2018-12-19 | 大成建設株式会社 | How to add underground facilities |
| CN112081130B (en) * | 2018-04-13 | 2021-12-21 | 河南省诚建检验检测技术股份有限公司 | Pile foundation device for civil engineering |
-
1995
- 1995-04-19 JP JP11800295A patent/JP2819008B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08284177A (en) | 1996-10-29 |
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