JP2004360797A

JP2004360797A - Base-isolated structure

Info

Publication number: JP2004360797A
Application number: JP2003160363A
Authority: JP
Inventors: Masaki Mochimaru; 昌己持丸; Megumi Ishibashi; 恵石橋
Original assignee: Oiles Industry Co Ltd
Current assignee: Oiles Industry Co Ltd
Priority date: 2003-06-05
Filing date: 2003-06-05
Publication date: 2004-12-24
Anticipated expiration: 2023-06-05
Also published as: JP4487498B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolated structure capable of preventing the relative excess horizontal displacement of an upper structure to a lower structure caused by strong wind or earthquake, and to prevent the damage of the upper structure. <P>SOLUTION: This base-isolated structure 1 comprises the lower structure 2, the upper structure 3, four base-isolation devices 4 mounted between the lower structure 2 and the upper structure 3 for isolating the relative vibration in the horizontal direction H of the upper structure 3 to the lower structure 2, and a limiting mechanism 5 for limiting the relative movement by more than a specific distance in the horizontal direction H of the upper structure 3 to the lower structure 2, and further limiting the relative movement in the vertical direction V of the upper structure 3 to the lower structure 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ビル、高架高速道路、橋若しくは戸建家屋等の上部構造物と基礎等の下部構造物との間に免震装置を介在させると共に地震、風等による上部構造物の下部構造物に対する相対的な大きな変位を制限するようにした免震構造体に関する。
【０００２】
【従来の技術】
地震による下部構造物の振動を上部構造物に伝達しないようにする免震装置として、例えば、下部構造物と上部構造物との間に平坦な滑り材を介在させた滑り免震装置、凹球面状の摺動面を有した下沓を下部構造物に、上部構造物に同じく凹球面状の摺動面を有した上沓を夫々取り付けて、下沓と上沓との間に摺動体を介在させた振り子型の滑り免震装置、下部構造物と上部構造物との間にころ部材又は球部材を介在させた転がり免震装置、下部構造物と上部構造物との間に積層ゴムを介在させた積層ゴム免震装置等が知られている。
【０００３】
【特許文献１】
特開２００１−９０３８２号公報
【０００４】
【発明が解決しようとする課題】
免震効果を十分に得るために免震装置により下部構造物に対する上部構造物の剛性を低くすることは、他方では上部構造物が下部構造物に対して水平方向に移動され易いということであり、斯かる免震装置に支えられた上部構造物に偶々生じ得る過大な強風が吹き付けられて上部構造物が免震装置の動作範囲を超えて大きく水平方向に移動されると、例えば振り子型の滑り免震装置の場合には、摺動体が下沓と上沓との間から外れてしまい正常状態への復帰が不可能となる上に、上部構造物に甚大な損傷を与える虞がある。このような虞は、上部構造物が比較的軽量な戸建住宅に予期しない強風が吹き付けられる場合又は予期しない大きな加速度をもった地震が生じる場合に特にある。
【０００５】
また、鉛直方向に関しての上沓の下沓からの離間を制限する機構を有しない振り子型の滑り免震装置及び転がり免震装置では、軽量の上部構造物に過大な強風が吹き付けられると、上部構造物が下部構造物から浮き上がってこれによっても上部構造物に甚大な損傷を与える虞がある。
【０００６】
本発明は、前記諸点に鑑みてなされたものであり、その目的とするところは、強風又は地震による上部構造物の下部構造物に対する相対的な水平方向の過大な変位を防止でき、而して、上部構造物の損傷等を防止できる免震構造体を提供することにある。
【０００７】
本発明の他の目的とするところは、軽量構造物に免震装置を用いた場合であっても、強風による上部構造物の下部構造物に対する相対的な鉛直方向の浮き上がりを防止でき、而して、上部構造物の損傷等を防止できる免震構造体を提供することにある。
【０００８】
【課題を解決するための手段】
本発明の第一の態様の免震構造体は、下部構造物と、上部構造物と、下部構造物と上部構造物との間に介在されていると共に下部構造物に対する上部構造物の相対的な水平方向の振動を免震する免震装置と、下部構造物に対する上部構造物の相対的な水平方向の一定以上の移動を制限する制限機構とを具備しており、ここで、制限機構は、下部構造物及び上部構造物のうちの一方に固着されていると共に一対の凹曲縁を有した水平方向制限部材と、下部構造物及び上部構造物のうちの他方に固着されていると共に水平方向制限部材の一方の凹曲縁に対峙するように配された一方の制限部材と、下部構造物及び上部構造物のうちの他方に固着されていると共に水平方向制限部材の他方の凹曲縁に対峙するように配された他方の制限部材とを具備している。
【０００９】
第一の態様の免震構造体では、一対の凹曲縁を有した水平方向制限部材が下部構造物及び上部構造物のうちの一方に固着されており、一方の制限部材が一方の凹曲縁に対峙するように、他方の制限部材が他方の凹曲縁に対峙するように配されて下部構造物及び上部構造物のうちの他方に固着されているために、強風又は地震による下部構造物に対する上部構造物の相対的な水平方向の一定以上の移動において一方又は他方の制限部材が水平方向制限部材の対応の凹曲縁に当接する結果、斯かる下部構造物に対する上部構造物の相対的な水平方向の一定以上の移動が阻止され、而して、強風又は地震による上部構造物の下部構造物に対する相対的な水平方向の過大な変位を防止でき、上部構造物の損傷等を防止できることになる。
【００１０】
本発明の第二の態様の免震構造体では、制限機構は、一方及び他方の制限部材に掛け渡されていると共に一対の凹曲縁で挟まれる水平方向制限部材の部位を跨いで配された鉛直方向制限部材を更に具備しており、下部構造物に対する上部構造物の相対的な鉛直方向の移動を制限するようになっている。
【００１１】
第二の態様の免震構造体によれば、鉛直方向制限部材が、下部構造物及び上部構造物のうちの他方に固着されている一方及び他方の制限部材に掛け渡されており、しかも、下部構造物及び上部構造物のうちの一方に固着されている水平方向制限部材の一対の凹曲縁で挟まれる部位を跨いで配されているために、例えば強風により下部構造物に対して上部構造物が鉛直方向に移動すると、水平方向制限部材の一対の凹曲縁で挟まれる部位に鉛直方向制限部材が当接する結果、斯かる下部構造物に対する上部構造物の鉛直方向の一定以上の移動が阻止され、而して、強風による上部構造物の下部構造物に対する相対的な鉛直方向の浮き上がりを防止でき、上部構造物の損傷等を防止できる。
【００１２】
鉛直方向制限部材は、好ましくは本発明の第三の態様の免震構造体のように、一端部で一方の制限部材に、他端部で他方の制限部材に夫々固着されている剛性の板状又は円柱状の長尺部材からなるが、本発明はこれに限定されず、例えば一端部で一方の制限部材に、他端部で他方の制限部材に夫々固着されている可撓性のワイヤ、チェーンであってもよい。
【００１３】
本発明において好ましくはその第四の態様の免震構造体のように、一対の凹曲縁の夫々は円弧状凹縁を有しており、一方及び他方の制限部材の夫々は対峙した円弧状凹縁の中心側に配されており、より好ましくは本発明の第五の態様の免震構造体のように、一対の円弧状凹縁の夫々は互いに実質的に同一の曲率半径を有しており、一方及び他方の制限部材の夫々は対峙した円弧状凹縁の略中心に配されており、いずれにしても各円弧状凹縁は、好ましくは本発明の第六の態様の免震構造体のように、実質的に１８０°の中心角を有している。一対の凹曲縁の夫々は、上記のように円弧状凹縁を有しているとよいのであるが、本発明はこれに限定されず、例えば楕円曲線状凹縁、双曲線状凹縁又は二次曲線状凹縁等であってもよい。
【００１４】
水平方向制限部材は、下部構造物に対する上部構造物の相対的な水平方向の一定以上の移動において一方及び他方の制限部材が当接する一対の凹曲縁を少なくとも有していればよいのであるが、本発明の第七の態様の免震構造体のように、一対の凹曲縁に加えて、各凹曲縁の夫々の一端に連続して連なっている直線縁を更に具備していてもよく、この場合、本発明の第八の態様の免震構造体のように、斯かる直線縁は互いに平行に伸びているとよい。
【００１５】
本発明においてその第九の態様の免震構造体のように、水平方向制限部材は板状体からなり、一方及び他方の制限部材の夫々は円柱体からなっていると好ましいが、本発明はこれに限定されない。
【００１６】
免震装置は、本発明の第十の態様の免震構造体のように、下部構造物に固着されていると共に凹球面状滑り上面を有した下沓と、上部構造物に固着されていると共に凹球面状滑り下面を有した上沓と、下沓と上沓との間に介在されていると共に下沓の凹球面状滑り上面に摺動自在に接触した凸球面状滑り下面及び上沓の凹球面状滑り下面に摺動自在に接触した凸球面状滑り上面を有した摺動体とを具備していても、また本発明の第十一の態様の免震構造体のように、下部構造物に固着されていると共に平坦面状滑り上面を有した下沓と、上部構造物に固着されていると共に下沓の平坦面状滑り上面に摺動自在に接触する平坦面状滑り下面を有した上沓とを具備していてもよい。また免震装置としては、第十及び第十一の態様のような振り子型の滑り免震装置及び滑り免震装置であってもよいが、転がり免震装置及び積層ゴム免震装置等であってもよい。
【００１７】
次に本発明及びその実施の形態を、図に示す好ましい例に基づいて更に詳細に説明する。なお、本発明はこれら例に何等限定されないのである。
【００１８】
【発明の実施の形態】
図１から図５において、本例の免震構造体１は、下部構造物２と、上部構造物３と、下部構造物２と上部構造物３との間に介在されていると共に下部構造物２に対する上部構造物３の相対的な水平方向Ｈの振動を免震する４個の免震装置４と、下部構造物２に対する上部構造物３の相対的な水平方向Ｈの一定以上の移動を制限すると共に、下部構造物２に対する上部構造物３の相対的な鉛直方向Ｖの移動を制限する制限機構５とを具備している。
【００１９】
下部構造物２は、地盤１１に形成された基礎１２及び１３からなり、基礎１２に２個の免震装置４が、基礎１３に残りの２個の免震装置４が設置されている。
【００２０】
上部構造物３は、互いに平行な一対のＸ方向フレーム２１及び２２と、互いに平行であってＸ方向フレーム２１及び２２を橋絡した一対のＹ方向フレーム２３及び２４と、これらＸ方向フレーム２１及び２２並びにＹ方向フレーム２３及び２４の上に構築される図示しない例えば戸建家屋とを具備している。Ｙ方向フレーム２３及び２４の夫々は、その両端部でＸ方向フレーム２１及び２２に溶接等により固着されている。
【００２１】
各免震装置４は夫々同様に構成されており、例えば下部構造物２の基礎１２に載置されている一つの免震装置４は、基礎１２にアンカーボルト等を介して固着されていると共に凹球面状滑り上面３１を有した下沓３２と、上部構造物３のＸ方向フレーム２１にボルト等を介して固着されていると共に凹球面状滑り下面３３を有した上沓３４と、下沓３２と上沓３４との間に介在されていると共に下沓３２の凹球面状滑り上面３１に水平方向Ｈに摺動自在に接触した凸球面状滑り下面３５及び上沓３４の凹球面状滑り下面３３に水平方向Ｈに摺動自在に接触した凸球面状滑り上面３６を有した摺動体３７とを具備している。
【００２２】
下沓３２は、矩形状の下基台４１と、下基台４１に溶接等により固着された円盤状部材４２とを具備しており、下基台４１において基礎１２にアンカーボルト等を介して固着されており、円盤状部材４２の上面に凹球面状滑り上面３１が形成されており、上沓３４は、矩形状の上基台４３と、上基台４３に溶接等により固着された円盤状部材４４とを具備しており、上基台４３においてＸ方向フレーム２１にボルト及び取付板（嵩上げ板）４５等を介して固着されており、円盤状部材４４の下面に凹球面状滑り下面３３が形成されており、扁平状の摺動体３７は、円盤状部材４４からの上部構造物３の荷重を円盤状部材４２に伝達している。
【００２３】
制限機構５は、下部構造物２及び上部構造物３のうちの一方、本例では上部構造物３のＹ方向フレーム２３及び２４の夫々に両端縁部５１及び５２の夫々で取付板（嵩上げ板）５３及び５４を介してボルト及び溶接等により固着されていると共に一対の凹曲縁５５及び５６を有した水平方向制限部材５７と、下部構造物２及び上部構造物３のうちの他方、本例では下部構造物２の基礎１２に固着されていると共に水平方向制限部材５７の一方の凹曲縁５５に対峙するように配された制限部材５８と、下部構造物２及び上部構造物３のうちの他方、本例では下部構造物２の基礎１３に固着されていると共に水平方向制限部材５７の凹曲縁５６に対峙するように配された制限部材５９と、制限部材５８及び５９に掛け渡されていると共に一対の凹曲縁５５及び５６で挟まれる水平方向制限部材５７の部位６０を跨いで配された鉛直方向制限部材６１とを具備している。
【００２４】
板状体からなる水平方向制限部材５７において、その凹曲縁５５は、本例では実質的に１８０°の中心角を有する円弧状凹縁からなり、その凹曲縁５６も、実質的に１８０°の中心角を有すると共に円弧状凹縁からなる凹曲縁５５と実質的に同一の曲率半径を有した円弧状凹縁からなる。
【００２５】
制限部材５８及び５９の夫々は、円柱体からなっていると共に対峙した対応の凹曲縁５５及び５６の夫々の中心側であって当該対応の凹曲縁５５及び５６の夫々の略中心に配されている。
【００２６】
鉛直方向制限部材６１は、一端部で制限部材５８に、他端部で制限部材５９に夫々溶接等により固着されている剛性の円柱状の長尺部材からなり、水平方向制限部材５７の部位６０の上面側を通って伸長しており、下部構造物２に対する上部構造物３の鉛直方向Ｖの浮き上がりによる部位６０の当接で当該部位６０の鉛直方向Ｖの浮き上がりを制限して、これにより、下部構造物２に対する上部構造物３の相対的な鉛直方向Ｖの移動を制限するようになっている。
【００２７】
以上の免震構造体１では、上部構造物３の荷重は各免震装置４を介して支持されており、例えば、地震による地盤１１の水平方向Ｈの振動で上部構造物３が相対的に水平方向Ｈに移動されると、円盤状部材４２の凹球面状滑り上面３１に対する摺動体３７の凸球面状滑り下面３５の相対的な摺動と、円盤状部材４４の凹球面状滑り下面３３に対する摺動体３７の凸球面状滑り上面３６の相対的な摺動とにより、上部構造物３は、図６に示すように下部構造物２に対して相対的に水平方向Ｈに移動される結果、下部構造物２の地震による水平方向Ｈの振動はそのままでは上部構造物３に伝達されないようになって、上部構造物３は地震に対して免震されることになる。
【００２８】
ところで免震構造体１では、一対の凹曲縁５５及び５６を有した水平方向制限部材５７が上部構造物３に固着されており、制限部材５８が凹曲縁５５に対峙するように、制限部材５９が凹曲縁５６に対峙するように配されて下部構造物２に固着されているために、大きな地震により又は上部構造物３への強風により上部構造物３が下部構造物２に対して相対的に大きく水平方向Ｈに移動されると、例えば図７に示すように制限部材５９が水平方向制限部材５７の凹曲縁５６に当接して上部構造物３の下部構造物２に対するそれ以上の相対的な水平方向Ｈの移動が阻止され、而して、大きな地震による上部構造物３の下部構造物２に対する相対的な水平方向Ｈの過大な変位が防止され、上部構造物３の損傷等が防止されるようになっており、上部構造物３の下部構造物２に対する相対的な大きな異なる水平方向Ｈの移動においても例えば制限部材５８が水平方向制限部材５７の凹曲縁５５に当接して上部構造物３の下部構造物２に対するそれ以上の相対的な水平方向Ｈの移動が阻止されるようになっている。
【００２９】
また免震構造体１では、鉛直方向制限部材６１が下部構造物２に固着されている制限部材５８及び５９に掛け渡されており、しかも、上部構造物３に固着されている水平方向制限部材５７の一対の凹曲縁５５及び５６で挟まれる部位６０を跨いで配されているために、強風により下部構造物２に対して上部構造物３が相対的に鉛直方向Ｖに移動する、換言すれば浮き上がろうとすると、水平方向制限部材５７の一対の凹曲縁５５及び５６で挟まれる部位６０に鉛直方向制限部材６１が当接する結果、斯かる下部構造物２に対する上部構造物３の鉛直方向の一定以上の相対的な移動が阻止され、而して、強風による上部構造物３の下部構造物２に対する鉛直方向Ｖの浮き上がりを防止でき、上部構造物３の損傷等を防止できる。
【００３０】
上記の免震構造体１では、各免震装置４に振り子型の滑り免震装置を用いたが、これに代えて又はこれと共に、図８に示すように、下部構造物２に固着されると共に平坦面状滑り上面７１を有した下沓７２と、上部構造物３に固着されると共に下沓７２の平坦面状滑り上面７１に水平方向Ｈに摺動自在に接触する平坦面状滑り下面７３を有した上沓７４とを具備している免震装置７５を用いてもよく、単なる滑り免震装置としての斯かる免震装置７５において、下沓７２は、下基台７６と、下基台７６に溶接等により固着された下滑り部材７７とを具備しており、下基台７６において基礎１２にアンカーボルト等を介して固着されており、下滑り部材７７の上面に平坦面状滑り上面７１が形成されており、上沓７４は、上基台７８と、上基台７８に溶接等により固着された上滑り部材７９とを具備しており、上基台７８においてＸ方向フレーム２１にボルト及び取付板（嵩上げ板）４５等を介して固着されており、上滑り部材７９の下面に平坦面状滑り下面７３が形成されており、斯かる免震装置７５でも、地震による地盤１１の水平方向Ｈの振動で上部構造物３が相対的に水平方向Ｈに移動されると、平坦面状滑り上面７１に対する平坦面状滑り下面７３の相対的な水平方向Ｈの摺動により、上部構造物３は、下部構造物２に対して相対的に水平方向Ｈに移動される。
【００３１】
また、水平方向制限部材５７は、一対の凹曲縁５５及び５６に加えて、図９に示すように、凹曲縁５５及び５６の夫々の一端に連続して連なっている直線縁８１及び８２並びに８３及び８４を更に具備していてもよく、凹曲縁５５の一端に連続して連なっている直線縁８１及び８２は互いに平行に伸びており、凹曲縁５６の一端に連続して連なっている直線縁８３及び８４は互いに平行に伸びており、斯かる直線縁８１及び８２並びに８３及び８４を更に具備した水平方向制限部材５７でも、上記と同様の効果を得ることができる上に、大きな地震による上部構造物３の下部構造物２に対する水平方向Ｈの過大な相対的な変位を誤動作なく確実に防止できる。
【００３２】
【発明の効果】
本発明によれば、強風又は地震による上部構造物の下部構造物に対する水平方向の相対的な過大な変位を防止でき、而して、上部構造物の損傷等を防止できる免震構造体を提供することができる。
【００３３】
また本発明によれば、軽量構造物に免震装置を用いた場合であっても、強風による上部構造物の下部構造物に対する相対的な鉛直方向の浮き上がりを防止でき、而して、上部構造物の損傷等を防止できる免震構造体を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態の好ましい一例の平面図である。
【図２】図１に示すＩＩ−ＩＩ線矢視断面図である。
【図３】図１に示す免震構造体の一部の説明図である。
【図４】図１に示す免震構造体の一部の説明図である。
【図５】図４に示すＶ−Ｖ線矢視断面図である。
【図６】図１に示す例の動作説明図である。
【図７】図１に示す例の動作説明図である。
【図８】本発明の実施の形態の好ましい他の例の一部の説明図である。
【図９】本発明の実施の形態の好ましい更に他の例の一部の説明図である。
【符号の説明】
１免震構造体
２下部構造物
３上部構造物
４免震装置
５制限機構[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a seismic isolation device between an upper structure such as a building, an elevated highway, a bridge or a detached house and a lower structure such as a foundation, and a lower structure of the upper structure due to an earthquake, wind, or the like. The present invention relates to a seismic isolation structure which limits a large displacement relative to the base.
[0002]
[Prior art]
As a seismic isolation device for preventing vibration of a lower structure caused by an earthquake from being transmitted to an upper structure, for example, a sliding seismic isolation device in which a flat sliding material is interposed between the lower structure and the upper structure, a concave spherical surface The lower shoe with a sliding surface is attached to the lower structure, and the upper structure is attached to the upper shoe, which also has a concave spherical sliding surface, and a sliding body is placed between the lower and upper shoes. Pendulum-type sliding seismic isolation device interposed, rolling seismic isolation device with roller members or ball members interposed between lower structure and upper structure, laminated rubber between lower structure and upper structure A laminated rubber seismic isolation device and the like are known.
[0003]
[Patent Document 1]
JP 2001-90382 A
[Problems to be solved by the invention]
Lowering the rigidity of the upper structure relative to the lower structure by the seismic isolation device in order to sufficiently obtain the seismic isolation effect means that, on the other hand, the upper structure is easily moved in the horizontal direction with respect to the lower structure. When an excessively strong wind which may be generated by chance on the upper structure supported by such a seismic isolation device is blown to move the upper structure largely horizontally beyond the operating range of the seismic isolation device, for example, a pendulum type In the case of the sliding seismic isolation device, the sliding body comes off from the space between the lower and upper shoes, making it impossible to return to a normal state. In addition, the upper structure may be seriously damaged. Such a fear is particularly when an unexpected strong wind is blown on a detached house whose upper structure is relatively light, or when an earthquake having an unexpectedly large acceleration occurs.
[0005]
In the case of pendulum-type sliding seismic isolation devices and rolling seismic isolation devices that do not have a mechanism to limit the separation of the upper shoe from the lower shoe in the vertical direction, if excessive strong wind is blown on the lightweight upper structure, the upper The structure may rise from the lower structure, which may also cause severe damage to the upper structure.
[0006]
The present invention has been made in view of the above-mentioned points, and an object of the present invention is to prevent an excessive displacement of an upper structure relative to a lower structure caused by a strong wind or an earthquake in a horizontal direction. Another object of the present invention is to provide a seismic isolation structure capable of preventing damage to an upper structure.
[0007]
Another object of the present invention is to prevent the upper structure from being lifted in the vertical direction relative to the lower structure due to strong wind even when the seismic isolation device is used for a lightweight structure. Accordingly, it is an object of the present invention to provide a seismic isolation structure capable of preventing damage to an upper structure.
[0008]
[Means for Solving the Problems]
A seismic isolation structure according to a first aspect of the present invention includes a lower structure, an upper structure, and a lower structure interposed between the lower structure and the upper structure. A seismic isolation device that segregates the horizontal structure, and a limiting mechanism that limits the relative movement of the upper structure relative to the lower structure by a certain amount or more in the horizontal direction. A horizontal limiting member fixed to one of the lower structure and the upper structure and having a pair of concave curved edges; and a horizontal restricting member fixed to the other of the lower structure and the upper structure, and One restricting member arranged to face one concave curved edge of the direction restricting member; and the other concave curved edge of the horizontal restricting member fixed to the other of the lower structure and the upper structure. And the other restriction member arranged to face the To have.
[0009]
In the seismic isolation structure of the first aspect, a horizontal restriction member having a pair of concave curved edges is fixed to one of the lower structure and the upper structure, and one of the restriction members has one concave curve. Since the other restricting member is arranged to face the edge and to face the other concave curved edge and is fixed to the other of the lower structure and the upper structure, the lower structure due to strong wind or earthquake The relative movement of the upper structure to the lower structure as a result of one or the other restricting member abutting the corresponding concave curved edge of the horizontal restricting member in a relative horizontal movement of the upper structure relative to the object. Horizontal movement of more than a certain level is prevented, so that excessive displacement of the upper structure relative to the lower structure due to strong wind or earthquake can be prevented, and damage to the upper structure can be prevented. You can do it.
[0010]
In the seismic isolation structure of the second aspect of the present invention, the limiting mechanism is arranged to span the part of the horizontal limiting member that is bridged between the one and the other limiting members and that is sandwiched between the pair of concave curved edges. And a vertical restricting member for restricting a vertical movement of the upper structure relative to the lower structure.
[0011]
According to the seismic isolation structure of the second aspect, the vertical restriction member is stretched over one and the other restriction member fixed to the other of the lower structure and the upper structure, and Since the horizontal direction limiting member fixed to one of the lower structure and the upper structure is arranged so as to straddle the portion sandwiched between the pair of concave curved edges, for example, the upper structure is positioned above the lower structure by strong wind. When the structure moves in the vertical direction, the vertical direction restriction member comes into contact with a portion sandwiched between the pair of concave curved edges of the horizontal direction restriction member. As a result, the vertical movement of the upper structure with respect to the lower structure is equal to or more than a certain amount in the vertical direction. Therefore, it is possible to prevent the upper structure from being lifted in the vertical direction relative to the lower structure due to strong wind, and to prevent damage to the upper structure.
[0012]
The vertical limiting member is preferably a rigid plate fixedly attached to one limiting member at one end and to the other limiting member at the other end, like the seismic isolation structure of the third aspect of the present invention. The present invention is not limited to this. For example, a flexible wire fixed to one limiting member at one end and fixed to the other limiting member at the other end. , A chain.
[0013]
In the present invention, preferably, as in the seismic isolation structure of the fourth aspect, each of the pair of concave curved edges has an arc-shaped concave edge, and each of the one and the other limiting members has an arc-shaped confronting face. Arranged on the central side of the concave edge, more preferably, as in the seismic isolation structure of the fifth aspect of the present invention, each of the pair of arc-shaped concave edges has substantially the same radius of curvature as one another. And each of the one and the other limiting members is disposed substantially at the center of the facing arcuate concave edge, and in each case, each arcuate concave edge is preferably the seismic isolation according to the sixth aspect of the present invention. Like the structure, it has a central angle of substantially 180 °. It is preferable that each of the pair of concave curved edges has an arc-shaped concave edge as described above, but the present invention is not limited to this, and for example, an elliptic curved concave edge, a hyperbolic concave edge, or It may be a concave curved edge or the like.
[0014]
The horizontal restricting member only needs to have at least a pair of concave curved edges with which one and the other restricting members come into contact with each other when the upper structure moves relative to the lower structure in a horizontal direction or more. Like the seismic isolation structure of the seventh aspect of the present invention, in addition to the pair of concave curved edges, the seismic isolation structure may further include a straight edge continuously connected to one end of each of the concave curved edges. In this case, like the seismic isolation structure of the eighth aspect of the present invention, such straight edges may extend in parallel with each other.
[0015]
In the present invention, as in the seismic isolation structure of the ninth aspect, it is preferable that the horizontal limiting member is formed of a plate-like body, and each of the one and other limiting members is formed of a cylindrical body. It is not limited to this.
[0016]
The seismic isolation device, like the seismic isolation structure of the tenth aspect of the present invention, is fixed to the lower structure and is fixed to the lower shoe having a concave spherical sliding upper surface and the upper structure. An upper shoe having a concave spherical sliding lower surface together with the upper and lower shoes, a convex spherical sliding lower surface and an upper shoe interposed between the lower and upper shoes and slidably contacting the concave spherical sliding upper surface of the lower shoe. And a sliding body having a convex spherical sliding upper surface slidably contacting the concave spherical sliding lower surface of the present invention. A lower shoe fixed to the structure and having a flat surface sliding upper surface, and a flat surface sliding lower surface fixed to the upper structure and slidably in contact with the flat surface sliding upper surface of the lower shoe. May be provided. The seismic isolation device may be a pendulum-type sliding seismic isolation device or a sliding seismic isolation device as in the tenth and eleventh embodiments, but may be a rolling seismic isolation device, a laminated rubber seismic isolation device, or the like. You may.
[0017]
Next, the present invention and its embodiments will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 5, a seismic isolation structure 1 of the present example is provided with a lower structure 2, an upper structure 3, and a lower structure 2 interposed between the lower structure 2 and the upper structure 3. And four seismic isolation devices 4 for isolating the vibration of the upper structure 3 relative to the lower structure 2 in the horizontal direction H, and moving the upper structure 3 relative to the lower structure 2 in the horizontal direction H by a certain amount or more. A restriction mechanism 5 for restricting the movement of the upper structure 3 relative to the lower structure 2 in the vertical direction V.
[0019]
The lower structure 2 includes foundations 12 and 13 formed on a ground 11, and two seismic isolation devices 4 are installed on the foundation 12, and the remaining two seismic isolation devices 4 are installed on the foundation 13.
[0020]
The upper structure 3 includes a pair of X-direction frames 21 and 22 parallel to each other, a pair of Y-direction frames 23 and 24 parallel to each other and bridging the X-direction frames 21 and 22, 22 and a detached house (not shown) constructed on the Y-direction frames 23 and 24. The Y-direction frames 23 and 24 are fixed to the X-direction frames 21 and 22 at both ends thereof by welding or the like.
[0021]
Each of the seismic isolation devices 4 is similarly configured. For example, one seismic isolation device 4 mounted on the foundation 12 of the lower structure 2 is fixed to the foundation 12 via anchor bolts and the like. A lower shoe 32 having a concave spherical sliding upper surface 31; an upper shoe 34 fixed to the X-direction frame 21 of the upper structure 3 via bolts and the like and having a concave spherical sliding lower surface 33; A convex spherical slide lower surface 35 and a concave spherical slide of the upper shoe 34 which are interposed between the upper shoe 34 and the lower shoe 32 and slidably contact the upper surface 31 of the lower shoe 32 slidably in the horizontal direction H. A sliding body 37 having a convex spherical sliding upper surface 36 slidably contacting the lower surface 33 in the horizontal direction H is provided.
[0022]
The lower shoe 32 includes a rectangular lower base 41 and a disk-shaped member 42 fixed to the lower base 41 by welding or the like, and the lower base 41 is attached to the foundation 12 via an anchor bolt or the like. A concave spherical sliding upper surface 31 is formed on the upper surface of the disk-shaped member 42, and the upper shoe 34 has a rectangular upper base 43 and a disk fixed to the upper base 43 by welding or the like. , And is fixed to the X-direction frame 21 on the upper base 43 via bolts and a mounting plate (raising plate) 45 and the like, and a concave spherical sliding lower surface is provided on the lower surface of the disk-shaped member 44. The flat sliding body 37 transmits the load of the upper structure 3 from the disk-shaped member 44 to the disk-shaped member 42.
[0023]
The restricting mechanism 5 includes a mounting plate (raising plate) at one of the end portions 51 and 52 on each of the Y-direction frames 23 and 24 of the upper structure 3 in one of the lower structure 2 and the upper structure 3 in this example. ) The horizontal direction restricting member 57 fixed by bolts and welding or the like via 53 and 54 and having a pair of concave curved edges 55 and 56, and the other of the lower structure 2 and the upper structure 3, In the example, the limiting member 58 fixed to the base 12 of the lower structure 2 and disposed so as to face one of the concave curved edges 55 of the horizontal limiting member 57, and the lower structure 2 and the upper structure 3 On the other hand, in the present embodiment, a restricting member 59 fixed to the foundation 13 of the lower structure 2 and disposed so as to face the concave curved edge 56 of the horizontal direction restricting member 57 is hung on the restricting members 58 and 59. Passed and a pair of concave It has and a vertical limit member 61 arranged across the site 60 in the horizontal direction restricting member 57 sandwiched by the edge 55 and 56.
[0024]
In the horizontal restricting member 57 made of a plate-like body, the concave curved edge 55 is an arc-shaped concave edge having a central angle of substantially 180 ° in this example, and the concave curved edge 56 is also substantially 180 °. An arc-shaped concave edge having a central angle of ° and an arc-shaped concave edge having substantially the same radius of curvature as the concave curved edge 55.
[0025]
Each of the limiting members 58 and 59 is formed of a columnar body, and is disposed on the center side of each of the opposed concave curved edges 55 and 56 and substantially at the center of each of the corresponding concave curved edges 55 and 56. Have been.
[0026]
The vertical direction restricting member 61 is formed of a rigid columnar long member fixed to the restricting member 58 at one end and to the restricting member 59 at the other end by welding or the like. The upper portion 3 of the upper structure 3 is extended through the upper surface side of the lower structure 2, and the lifting of the upper structure 3 in the vertical direction V by the lifting of the portion 60 by the lifting of the upper structure 3 in the vertical direction V limits The movement of the upper structure 3 relative to the lower structure 2 in the vertical direction V is restricted.
[0027]
In the above seismic isolation structure 1, the load of the upper structure 3 is supported via each seismic isolation device 4. For example, the vibration of the ground 11 in the horizontal direction H due to the earthquake causes the upper structure 3 to relatively move. When moved in the horizontal direction H, the relative sliding of the convex spherical sliding lower surface 35 of the sliding body 37 with respect to the concave spherical sliding upper surface 31 of the disk-shaped member 42 and the concave spherical sliding lower surface 33 of the disk-shaped member 44. As a result, the upper structure 3 is moved in the horizontal direction H relative to the lower structure 2 as shown in FIG. The vibration of the lower structure 2 in the horizontal direction H due to the earthquake is not transmitted to the upper structure 3 as it is, and the upper structure 3 is isolated from the earthquake.
[0028]
By the way, in the seismic isolation structure 1, a horizontal restriction member 57 having a pair of concave curved edges 55 and 56 is fixed to the upper structure 3, and the restriction member 58 is restricted so as to face the concave curved edge 55. Since the member 59 is disposed so as to face the concave curved edge 56 and is fixed to the lower structure 2, the upper structure 3 is moved relative to the lower structure 2 by a large earthquake or a strong wind to the upper structure 3. 7, the restricting member 59 abuts against the concave curved edge 56 of the horizontal restricting member 57 to move the upper structure 3 relative to the lower structure 2 as shown in FIG. The above movement in the relative horizontal direction H is prevented, so that excessive displacement of the upper structure 3 in the horizontal direction H relative to the lower structure 2 due to a large earthquake is prevented, and the upper structure 3 is displaced. Damage, etc. is prevented. In the movement of the structure 3 in the relatively different horizontal direction H relative to the lower structure 2, for example, the restriction member 58 abuts on the concave curved edge 55 of the horizontal direction restriction member 57 and the upper structure 3 moves with respect to the lower structure 2. Further movement in the horizontal direction H is prevented.
[0029]
Further, in the seismic isolation structure 1, the vertical restriction member 61 is stretched over the restriction members 58 and 59 fixed to the lower structure 2, and furthermore, the horizontal restriction member fixed to the upper structure 3. Since the upper structure 3 is disposed across the portion 60 sandwiched between the pair of concave curved edges 55 and 56 of 57, the upper structure 3 relatively moves in the vertical direction V with respect to the lower structure 2 by strong wind. If it tries to float, the vertical direction restricting member 61 abuts on the portion 60 sandwiched between the pair of concave curved edges 55 and 56 of the horizontal direction restricting member 57, so that the upper structure 3 A relative movement of a certain degree or more in the vertical direction is prevented, so that the upper structure 3 can be prevented from rising from the lower structure 2 in the vertical direction V due to strong wind, and damage to the upper structure 3 can be prevented.
[0030]
In the above seismic isolation structure 1, a pendulum type sliding seismic isolation device is used for each seismic isolation device 4, but instead or together with this, it is fixed to the lower structure 2 as shown in FIG. 8. A lower shoe 72 having a flat surface sliding upper surface 71 and a flat surface sliding lower surface fixed to the upper structure 3 and slidably contacting the flat surface sliding upper surface 71 of the lower shoe 72 in the horizontal direction H. A seismic isolation device 75 including an upper shoe 74 having a base 73 may be used. In such a seismic isolation device 75 as a simple sliding seismic isolation device, the lower shoe 72 includes a lower base 76 and a lower base 76. A lower slide member 77 fixed to the base 76 by welding or the like is provided. The lower slide member 77 is fixed to the base 12 via an anchor bolt or the like in the lower base 76, and has a flat surface on the upper surface of the lower slide member 77. A sliding upper surface 71 is formed, and the upper shoe 74 includes an upper base 78 and an upper base. 8 is provided with an upper sliding member 79 fixed by welding or the like, and is fixed to the X-direction frame 21 on the upper base 78 via a bolt and a mounting plate (raising plate) 45 or the like. A flat planar sliding lower surface 73 is formed on the lower surface, and even in such a seismic isolation device 75, when the upper structure 3 is relatively moved in the horizontal direction H by the vibration of the ground 11 in the horizontal direction H due to the earthquake, The upper structure 3 is moved in the horizontal direction H relative to the lower structure 2 due to the sliding of the flat surface sliding lower surface 73 relative to the flat surface sliding upper surface 71 in the horizontal direction H.
[0031]
In addition to the pair of concave curved edges 55 and 56, the horizontal direction restricting member 57 has straight edges 81 and 82 continuously connected to one ends of the concave curved edges 55 and 56, respectively, as shown in FIG. 83 and 84, and the straight edges 81 and 82 continuously connected to one end of the concave curved edge 55 extend in parallel with each other and continuously connected to one end of the concave curved edge 56. The straight edges 83 and 84 extend in parallel to each other, and the horizontal direction limiting member 57 further provided with such straight edges 81 and 82 and 83 and 84 can obtain the same effect as described above. Excessive relative displacement of the upper structure 3 with respect to the lower structure 2 in the horizontal direction H due to a large earthquake can be reliably prevented without malfunction.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the seismic isolation structure which can prevent the horizontal excessive displacement of the upper structure with respect to the lower structure by a strong wind or an earthquake, and can prevent the damage of an upper structure etc. is provided. can do.
[0033]
Further, according to the present invention, even when the seismic isolation device is used for a lightweight structure, it is possible to prevent the upper structure from being lifted in the vertical direction relative to the lower structure due to strong wind, and thus the upper structure can be prevented. A seismic isolation structure that can prevent damage to objects and the like can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a preferred example of an embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II shown in FIG.
FIG. 3 is an explanatory view of a part of the seismic isolation structure shown in FIG.
FIG. 4 is an explanatory view of a part of the seismic isolation structure shown in FIG.
5 is a sectional view taken along line VV shown in FIG.
FIG. 6 is an operation explanatory diagram of the example shown in FIG. 1;
FIG. 7 is an operation explanatory diagram of the example shown in FIG. 1;
FIG. 8 is an explanatory diagram of a part of another preferable example of the embodiment of the present invention.
FIG. 9 is an explanatory view of a part of still another preferred example of the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation structure 2 Lower structure 3 Upper structure 4 Seismic isolation device 5 Restriction mechanism

Claims

A lower structure, an upper structure, a seismic isolation device that is interposed between the lower structure and the upper structure and that isolates a horizontal vibration of the upper structure relative to the lower structure; A restriction mechanism for restricting a relative horizontal movement of the upper structure relative to the lower structure by a certain amount or more, wherein the restriction mechanism is fixed to one of the lower structure and the upper structure. And a horizontal limiting member having a pair of concave curved edges, and is disposed so as to be fixed to the other of the lower structure and the upper structure and to face one concave curved edge of the horizontal limiting member. One limiting member, and the other limiting member fixed to the other of the lower structure and the upper structure and arranged to face the other concave curved edge of the horizontal limiting member. Seismic isolation structure.

The restricting mechanism further includes a vertical restricting member that is bridged between the one and the other restricting members and that is disposed across a portion of the horizontal restricting member sandwiched between the pair of concave curved edges. The seismic isolation structure according to claim 1, wherein a relative vertical movement of the upper structure with respect to the object is restricted.

3. The seismic isolation device according to claim 2, wherein the vertical restriction member comprises a rigid plate-like or columnar long member fixed to one restriction member at one end and to the other restriction member at the other end. Structure.

4. The method according to claim 1, wherein each of the pair of concave curved edges has an arc-shaped concave edge, and each of the one and other restricting members is disposed at a center side of the confronted arc-shaped concave edge. The seismic isolation structure described in the section.

5. The method according to claim 4, wherein each of the pair of arc-shaped concave edges has substantially the same radius of curvature as one another, and each of the one and other restricting members is disposed substantially at the center of the confronted arc-shaped concave edges. The seismic isolation structure described.

The seismic isolation structure according to claim 4 or 5, wherein each arc-shaped concave edge has a central angle of substantially 180 °.

The seismic isolation structure according to any one of claims 1 to 6, wherein the horizontal restriction member further includes a straight edge continuously connected to one end of each concave curved edge.

The seismic isolation structure according to claim 7, wherein straight edges continuously connected to one end of each of the concave curved edges extend in parallel with each other.

The seismic isolation structure according to any one of claims 1 to 8, wherein the horizontal direction limiting member is formed of a plate, and each of the one and other limiting members is formed of a cylindrical body.

The seismic isolation device includes a lower shoe fixed to the lower structure and having a concave spherical sliding upper surface, an upper shoe fixed to the upper structure and having a concave spherical sliding lower surface, and a lower shoe. A convex spherical sliding lower surface interposed between the upper shoe and slidably contacting the concave spherical sliding upper surface of the lower shoe and a convex spherical sliding surface slidably contacting the concave spherical sliding lower surface of the upper shoe. The seismic isolation structure according to any one of claims 1 to 9, further comprising a sliding body having a sliding upper surface.

The seismic isolation device is fixed to the lower structure and has a flat surface sliding upper surface, and is slidably contacted with the upper structure and fixed to the flat surface sliding upper surface of the lower shoe. The seismic isolation structure according to any one of claims 1 to 9, further comprising an upper shoe having a flat planar sliding lower surface.

A seismic isolation device for use in the seismic isolation structure according to any one of claims 1 to 11.