JP2000045542A - Foundation base isolation method for existing structure - Google Patents
Foundation base isolation method for existing structureInfo
- Publication number
- JP2000045542A JP2000045542A JP10216009A JP21600998A JP2000045542A JP 2000045542 A JP2000045542 A JP 2000045542A JP 10216009 A JP10216009 A JP 10216009A JP 21600998 A JP21600998 A JP 21600998A JP 2000045542 A JP2000045542 A JP 2000045542A
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- JP
- Japan
- Prior art keywords
- seismic isolation
- existing structure
- existing
- pit
- base 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.)
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- 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、既存構造物を基礎
部分において免震化する際に用いられる基礎免震化工法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base seismic isolation method used for seismic isolation of an existing structure at a foundation.
【０００２】[0002]
【従来の技術】近年における免震化の要請の高まりか
ら、既存の建物等の各種構造物に対しても、当該構造物
の基礎部分に、新たに積層ゴム等からなる高減衰弾性体
支承やすべり支承等を用いた免震装置を介装することに
より、地震によって地盤から構造物に伝播しようとする
振動を緩衝して、構造物に生じる応力や変形を少なくし
て大地震から当該構造物を守る各種の免震化工法が開発
されている。2. Description of the Related Art In recent years, the demand for seismic isolation has been increasing, and even for various structures such as existing buildings, a high damping elastic body bearing made of a laminated rubber or the like is newly provided on the foundation of the structure. By installing a seismic isolation device using sliding bearings, etc., the vibration that tends to propagate from the ground to the structure due to the earthquake is buffered, and the stress and deformation that occur in the structure are reduced, and the structure concerned from a large earthquake Various seismic isolation methods have been developed to protect buildings.
【０００３】このような既存構造物の基礎免震化工法に
おいては、既に完成されている建物等の基礎において、
柱や杭等の軸力材を切断して上記免震装置を介装する必
要があるために、極力建物の使用を妨げずに短期間で施
工することが強く要請されている。[0003] In such a base seismic isolation method for existing structures, the foundation of a completed building or the like is used.
Since it is necessary to cut off axial members such as pillars and piles and to interpose the above seismic isolation device, it is strongly demanded to construct the building as quickly as possible without hindering the use of the building.
【０００４】図４は、躯体を構成する柱１の下部に形成
された複数の独立フーチング２が、地中に埋め込まれた
多数本の杭３によって支持された既存建物９を、その基
礎部分において免震化させるための従来の免震化工法を
示すものである。この基礎免震化工法は、先ず基礎部分
の土砂を掘削して免震ピット４を形成し、この掘削部の
底部に新設フーチング５を構築した後に、この新設フー
チング５の上面および既設のフーチング２の下面に、そ
れぞれ上下部ペデスタル６，７を構築し、次いでこれら
ペデスタル６，７間に、図中点線で示すように上記免震
装置８を取り付けて、躯体の荷重をこの免震装置８で支
持した後に、杭３の露出部分および図中点線で示す既存
のフーチング２の不要部分を切断して解体し、最終的に
建物の地上レベルの周囲に、免震ピット４を覆う跳ね出
しスラブ（図示を略す。）を新設するものである。[0004] Fig. 4 shows an existing building 9 in which a plurality of independent footings 2 formed under a pillar 1 constituting a skeleton are supported by a large number of piles 3 embedded in the ground. This shows the conventional seismic isolation method for seismic isolation. In the base seismic isolation method, firstly, earth and sand in a foundation portion are excavated to form a seismic isolation pit 4, and a new footing 5 is constructed at the bottom of the excavated portion. The upper and lower pedestals 6 and 7 are constructed on the lower surface of the pedestal 6, respectively, and the seismic isolation device 8 is attached between the pedestals 6 and 7 as shown by a dotted line in the figure. After the support, the exposed portion of the pile 3 and the unnecessary portion of the existing footing 2 shown by a dotted line in the figure are cut and dismantled, and finally, a projecting slab (see FIG. 4) covering the seismic isolation pit 4 around the ground level of the building ( (Not shown)).
【０００５】[0005]
【発明が解決しようとする課題】ところで、この種の既
存建物の基礎免震化工法においては、施工中における耐
震安全性も確保する必要がある。そこで、基礎部分の土
砂を掘削して露出した杭３によって既存建物の荷重を支
持する際に、免震装置８を介装すべき位置の杭３ａにつ
いては、予め切断しておく必要があるために、これによ
って鉛直荷重の支持力が不足する場合には、別途新設フ
ーチング５と既存フーチング２との間にサポートジャッ
キ等を仮設することにより、当該不足分を補っている。By the way, in this kind of the base seismic isolation method of an existing building, it is necessary to ensure seismic safety during construction. Therefore, when the load of the existing building is supported by the pile 3 excavated by excavating the soil of the foundation, the pile 3a at the position where the seismic isolation device 8 is to be interposed needs to be cut in advance. In the case where the supporting capacity of the vertical load is insufficient, the shortage is supplemented by temporarily installing a support jack or the like between the newly installed footing 5 and the existing footing 2.
【０００６】しかしながら、上記従来の既存建物におけ
る基礎免震化工法にあっては、基礎部分の土砂を掘削し
た時点で、地盤からの拘束がなくなった杭３においてそ
の水平耐力が大幅に低減化してしまう。このため、万一
作業中に地震が発生した場合に、水平方向の地震力に対
して充分な安全性を確保するために、別途免震ピットに
切り梁等を仮設しており、当該切り梁の搬入出や仮設作
業等に多大の手間とコストとを要するという問題点があ
った。また、かかる仮設作業が、工期の長期化を招く一
因ともなっていた。[0006] However, in the above-mentioned conventional seismic isolation method for an existing building, the horizontal strength of the pile 3 which is no longer restrained from the ground is greatly reduced at the time of excavating the soil of the foundation. I will. For this reason, in the event that an earthquake occurs during the work, in order to ensure sufficient safety against horizontal seismic force, a seismic isolation pit is temporarily provided with seismic beams, etc. There is a problem that it takes a lot of labor and cost for loading and unloading and temporary work. In addition, such temporary work has been one of the causes of the prolonged construction period.
【０００７】本発明は、このような従来の既存建物の基
礎免震化工法が有する課題を有効に解決すべくなされた
もので、施工中における耐震安全性を確保することがで
き、併せて作業の簡易化と工期の短縮化をも図ることが
できる、既存構造物の基礎免震化工法を提供することを
目的とするものである。SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional seismic isolation method for existing buildings, and can ensure seismic safety during construction. It is an object of the present invention to provide a base seismic isolation method for existing structures, which can also simplify the construction and shorten the construction period.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載の本発明
に係る既存構造物の基礎免震化工法は、既存構造物の基
礎部分の土砂を掘削して免震ピットを形成し、この免震
ピット内に上記既存構造物の荷重を支持する免震装置を
取り付けるとともに、既存の軸力材を切断することによ
り、上記既存構造物の荷重を免震装置によって支承させ
るに際して、予め既存構造物の周囲に免震ピットを画成
する擁壁を構築するとともに、上記既存構造物から延出
して免震ピットの天井となる跳ね出しスラブを先行して
作成し、これら擁壁と跳ね出しスラブとを連結部材によ
って仮固定した後に、上記既存構造物の軸力材が露出す
る基礎部分を掘削し、かつ免震装置を取り付けた後に連
結部材を撤去することを特徴とするものである。According to the first aspect of the present invention, there is provided a method for seismic isolation of a foundation of an existing structure according to the present invention. A seismic isolation device that supports the load of the existing structure is installed in the seismic isolation pit, and the existing axial load is cut to allow the load of the existing structure to be supported by the seismic isolation device. In addition to constructing a retaining wall that defines the seismic isolation pit around the object, a spring slab extending from the existing structure and serving as the ceiling of the seismic isolation pit is created ahead of time, and these retaining walls and the spring slab are created. Are temporarily fixed by a connecting member, a base portion of the existing structure where the axial force member is exposed is excavated, and the connecting member is removed after attaching the seismic isolation device.
【０００９】請求項１に記載の発明においては、既存構
造物の周囲に構築した擁壁と、先行して形成した既存構
造物周囲の跳ね出しスラブとを、ボルト等の連結部材に
よって仮固定した後に、杭等の軸力材が露出する基礎部
分を掘削しているので、万一施工中に地震が発生した場
合においても、上記既存構造物を擁壁に仮固定している
連結部材によって既存構造物に作用する水平荷重に対抗
することができる。また、上記免震装置を取り付けた後
には、上記連結部材を撤去するのみで既存構造物に対す
る基礎免震化が完了する。According to the first aspect of the present invention, the retaining wall constructed around the existing structure and the projecting slab around the existing structure formed in advance are temporarily fixed by connecting members such as bolts. Later, the foundation where the axial force members such as piles are exposed is excavated, so even if an earthquake occurs during construction, the existing structure is temporarily fixed to the retaining wall by the connecting member. It can withstand horizontal loads acting on the structure. Further, after the seismic isolation device is mounted, the basic seismic isolation of the existing structure is completed only by removing the connecting member.
【００１０】したがって、本発明に係る既存建物の基礎
免震化工法によれば、施工中における耐震安全性が確保
されるとともに、従来のように養生のための切り梁等の
仮設工事が不要となるため、施工の簡易化と作業コスト
の低減化を図ることができ、かつ工期の短縮化も実現す
ることが可能になる。Therefore, according to the base seismic isolation method of an existing building according to the present invention, seismic safety during construction is ensured, and temporary work such as cutting beams for curing as in the conventional construction is not required. Therefore, simplification of construction and reduction of work cost can be achieved, and shortening of construction period can be realized.
【００１１】[0011]
【発明の実施の形態】以下、図面に基づいて本発明に係
る既存構造物の基礎免震化工法の一実施形態について説
明する。図１〜図３は、本発明を、図４に示した杭基礎
による既存建物（既存構造物）９の基礎免震化工法に適
用した場合の施工初期段階における状態を示すもので、
図４に示した構成と同一の部分については同一符号を付
してその説明を簡略化する。この基礎免震化工法におい
ては、先ず既存建物９の周囲に、後に免震ピット４を画
成する免震ピット擁壁１０を構築する。この際に、免震
ピット擁壁１０の複数箇所に、それぞれ図３に示すよう
に、上面に開口する袋ナット１１を埋設しておく。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a method for converting an existing structure into a base according to the present invention. 1 to 3 show a state at an initial stage of construction when the present invention is applied to a base seismic isolation method for an existing building (existing structure) 9 using a pile foundation shown in FIG.
The same parts as those in the configuration shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be simplified. In this basic seismic isolation method, first, a seismic isolation pit retaining wall 10 that defines the seismic isolation pit 4 is constructed around the existing building 9. At this time, as shown in FIG. 3, cap nuts 11 each having an opening on the upper surface are buried in a plurality of locations of the seismic isolation pit retaining wall 10.
【００１２】他方、既存建物９の周囲には、外周縁が免
震ピット擁壁１０の上方まで水平方向に延出して、最終
的に上記免震ピット４の天井となる跳ね出しスラブ１２
を先行して構築する。なお、この跳ね出しスラブ１２の
複数箇所には、工事用の仮開口部１３を形成しておく。
また、上記跳ね出しスラブの１２の周縁部であって、か
つ擁壁１０の袋ナット１１の上方位置には、鋼管１４を
埋め込むことにより貫通孔を形成しておく。On the other hand, around the existing building 9, an outer peripheral edge extends horizontally above the seismic isolation pit retaining wall 10, and finally, a projecting slab 12 serving as a ceiling of the seismic isolation pit 4.
Is built in advance. It should be noted that temporary openings 13 for construction are formed at a plurality of locations of the projecting slab 12.
Further, a through-hole is formed by embedding a steel pipe 14 at the peripheral edge of the spring slab 12 and above the cap nut 11 of the retaining wall 10.
【００１３】そして、上記跳ね出しスラブ１２が完成し
た後に、鋼管１４側からボルト（連結部材）１５を挿入
して、擁壁１０側の袋ナット１１に締め付けることによ
り、跳ね出しスラブ１２を擁壁１０に仮固定する。この
ようにして、既存建物９を、跳ね出しスラブ１２に挿入
したボルト１５を介して擁壁１０に仮固定した後に、図
４に示した従来の基礎免震化工法と同様に、先ず基礎部
分の土砂１６を掘削して免震ピット４を形成し、次いで
この掘削部の底部に新設フーチング５を構築するといっ
た、以降の免震化作業を行う。[0013] After the projecting slab 12 is completed, a bolt (connecting member) 15 is inserted from the steel pipe 14 side and tightened to the cap nut 11 on the retaining wall 10 side, so that the projecting slab 12 is retained. Temporarily fix to 10. In this way, after the existing building 9 is temporarily fixed to the retaining wall 10 via the bolts 15 inserted into the projecting slab 12, first, as in the conventional base isolation method shown in FIG. The seismic isolation work is performed by excavating the earth and sand 16 to form a seismic isolation pit 4 and then constructing a new footing 5 at the bottom of the excavated portion.
【００１４】そして、図４に示したものと同様にして新
設フーチング５と既存のフーチング２との間に上記免震
装置８を取り付け、杭３の露出部分およびフーチング２
の不要部分を切断して解体した後に、それまで跳ね出し
スラブ１２を擁壁１０に仮固定していたボルト１５を取
り外す。これにより、上記既存建物９に対する基礎免震
化工事が完了する。Then, the seismic isolation device 8 is attached between the new footing 5 and the existing footing 2 in the same manner as shown in FIG.
After the unnecessary portion is cut and disassembled, the bolts 15 that temporarily fixed the projecting slab 12 to the retaining wall 10 are removed. Thus, the base seismic isolation work for the existing building 9 is completed.
【００１５】以上のように、本既存建物の基礎免震化工
法によれば、予め既存建物９の周囲に構築した免震ピッ
ト擁壁１０と、先行して形成した既存建物９の周囲の跳
ね出しスラブ１２とを、鋼管１４側から挿入されて袋ナ
ット１１に締め付けたボルト１５によって仮固定した後
に、基礎部分におけるフーチング２および杭３の周囲の
土砂１６を掘削しているので、万一施工中に地震が発生
した場合においても、上記ボルト１５によって既存建物
９に作用する水平荷重に対抗することができる。また、
免震装置８を取り付けた後には、上記ボルト１５を撤去
するのみで既存建物９に対する基礎免震化が完了する。As described above, according to the basic seismic isolation method of the existing building, the seismic isolation pit retaining wall 10 previously constructed around the existing building 9 and the bouncing around the existing building 9 formed in advance. Since the take-out slab 12 and the soil 16 around the footing 2 and the pile 3 in the base portion are excavated after temporarily fixing the take-out slab 12 with the bolt 15 inserted from the steel pipe 14 side and tightening the cap nut 11, Even when an earthquake occurs, the bolts 15 can resist the horizontal load acting on the existing building 9. Also,
After the seismic isolation device 8 is attached, the basic seismic isolation of the existing building 9 is completed only by removing the bolt 15.
【００１６】この結果、上記既存建物９の基礎免震化工
法によれば、施工中における耐震安全性が確保されると
ともに、従来のように養生のための切り梁等の仮設工事
が不要となるため、施工が簡易化と作業コストの低減化
を図ることができ、かつ工期の短縮化も実現することが
できる。As a result, according to the base seismic isolation method of the existing building 9, the seismic safety during the construction is ensured, and the temporary work such as cutting beams for curing as in the related art is not required. Therefore, the construction can be simplified, the operation cost can be reduced, and the construction period can be shortened.
【００１７】なお、上述した実施の形態においては、本
発明に係る既存構造物の基礎免震化工法を、複数の独立
フーチング２が多数本の杭３によって支持された既存建
物における基礎免震化工法に適用した場合に付いてのみ
説明したが、これに限定されるものではなく、他の杭基
礎や連続フーチング等によって支持された各種構造物の
基礎部分における免震化に対しても、同様に適用するこ
とが可能である。In the above-described embodiment, the base seismic isolation method for an existing structure according to the present invention is applied to an existing building in which a plurality of independent footings 2 are supported by a large number of piles 3. Although the explanation has been made only when applied to the law, it is not limited to this, and the same applies to seismic isolation at the foundation of other pile foundations and various structures supported by continuous footing etc. It is possible to apply to.
【００１８】また、擁壁１０と跳ね出しスラブ１２とを
仮固定する連結部材に付いても、上記ボルト１５および
袋ナット１１に限らず、各種の形態の連結部材を使用す
ることができる。Further, the connecting member for temporarily fixing the retaining wall 10 and the spring-out slab 12 is not limited to the bolt 15 and the cap nut 11, and various types of connecting members can be used.
【００１９】[0019]
【発明の効果】以上説明したように、請求項１に記載の
既存構造物の基礎免震化工法によれば、基礎部分を掘削
する前に、既存構造物の周囲に構築した擁壁と、先行し
て形成した既存構造物周囲の跳ね出しスラブと仮固定
し、免震装置を取り付けた後に上記連結部材を撤去して
いるので、施工中に構造物に対する水平耐力を確保し
て、その耐震安全性が向上するとともに、従来のように
養生のための仮設工事が不要となるため、施工が簡易化
と作業コストの低減化を図ることができ、かつ工期の短
縮化も実現することができる。As described above, according to the method for seismic isolation of a foundation of an existing structure according to the first aspect, before excavating a foundation portion, a retaining wall constructed around the existing structure; Temporarily fixed to the projecting slab around the existing structure that was formed earlier, and after attaching the seismic isolation device, the connecting members were removed, so the horizontal strength against the structure was secured during construction, Since safety is improved and temporary construction work for curing is not required as in the past, construction can be simplified, work costs can be reduced, and the construction period can be shortened. .
【図１】本発明の一実施形態を説明するための図で、擁
壁と跳ね出しスラブとを仮固定した状態を示す平面図で
ある。FIG. 1 is a view for explaining one embodiment of the present invention, and is a plan view showing a state in which a retaining wall and a projecting slab are temporarily fixed.
【図２】図１の既存構造物外周部における縦断面図であ
る。FIG. 2 is a longitudinal sectional view of an outer peripheral portion of the existing structure in FIG.
【図３】図２のＩＩＩ部拡大図である。FIG. 3 is an enlarged view of a part III in FIG. 2;
【図４】従来の既存建物の基礎免震化工法を説明するた
めの図で、施工中の建物中央部を示す縦断面図である。FIG. 4 is a view for explaining a conventional base seismic isolation method for an existing building, and is a longitudinal sectional view showing a central part of the building during construction.
１ 既存建物（既存構造物）の柱 ２ フーチング ３ 杭 ４ 免震ピット ８ 免震装置 ９ 既存建物（既存構造物） １０ 免震ピット擁壁 １１ 袋ナット １２ 跳ね出しスラブ １５ ボルト（連結部材） DESCRIPTION OF SYMBOLS 1 Existing building (existing structure) pillar 2 Footing 3 Pile 4 Seismic isolation pit 8 Seismic isolation device 9 Existing building (existing structure) 10 Retaining wall of seismic isolation pit 11 Bag nut 12 Protruding slab 15 Bolt (connecting member)
Claims (1)
免震ピットを形成し、この免震ピット内に上記既存構造
物の荷重を支持する免震装置を取り付けるとともに、既
存の軸力材を切断することにより、上記既存構造物の荷
重を上記免震装置によって支承させる既存構造物の基礎
免震化工法において、 予め、上記既存構造物の周囲に、上記免震ピットを画成
する擁壁を構築するとともに、上記既存構造物から延出
して上記免震ピットの天井となる跳ね出しスラブを先行
して作成し、これら擁壁と跳ね出しスラブとを連結部材
によって仮固定した後に、上記既存構造物の上記軸力材
が露出する基礎部分を掘削し、かつ上記免震装置を取り
付けた後に上記連結部材を撤去することを特徴とする既
存構造物の基礎免震化工法。A seismic isolation pit is formed by excavating earth and sand in a foundation portion of an existing structure, and a seismic isolation device for supporting the load of the existing structure is mounted in the seismic isolation pit. In the base seismic isolation method for an existing structure in which the load of the existing structure is supported by the seismic isolation device by cutting the material, the seismic isolation pit is defined in advance around the existing structure. Along with constructing the retaining wall, a spring slab extending from the existing structure and serving as the ceiling of the seismic isolation pit is created in advance, and these retaining walls and the spring slab are temporarily fixed by connecting members, A base seismic isolation method for an existing structure, comprising excavating a base portion of the existing structure where the axial force member is exposed, removing the connecting member after attaching the seismic isolation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10216009A JP2000045542A (en) | 1998-07-30 | 1998-07-30 | Foundation base isolation method for existing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10216009A JP2000045542A (en) | 1998-07-30 | 1998-07-30 | Foundation base isolation method for existing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000045542A true JP2000045542A (en) | 2000-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10216009A Pending JP2000045542A (en) | 1998-07-30 | 1998-07-30 | Foundation base isolation method for existing structure |
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| JP (1) | JP2000045542A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003278391A (en) * | 2002-03-22 | 2003-10-02 | Shimizu Corp | Aseismatic support method and structure in temporarily receiving building |
| JP2011184883A (en) * | 2010-03-05 | 2011-09-22 | Taisei Corp | Base-isolating method |
| JP2013015016A (en) * | 2012-10-26 | 2013-01-24 | Taisei Corp | Base isolation structure |
| JP2018096050A (en) * | 2016-12-09 | 2018-06-21 | 大成建設株式会社 | Horizontal force restraint structure and seismic isolation method |
-
1998
- 1998-07-30 JP JP10216009A patent/JP2000045542A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003278391A (en) * | 2002-03-22 | 2003-10-02 | Shimizu Corp | Aseismatic support method and structure in temporarily receiving building |
| JP2011184883A (en) * | 2010-03-05 | 2011-09-22 | Taisei Corp | Base-isolating method |
| JP2013015016A (en) * | 2012-10-26 | 2013-01-24 | Taisei Corp | Base isolation structure |
| JP2018096050A (en) * | 2016-12-09 | 2018-06-21 | 大成建設株式会社 | Horizontal force restraint structure and seismic isolation method |
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