JP3945344B2

JP3945344B2 - Seismic isolation device

Info

Publication number: JP3945344B2
Application number: JP2002239916A
Authority: JP
Inventors: 光雄金澤
Original assignee: 株式会社金澤製作所
Priority date: 2002-07-17
Filing date: 2002-07-17
Publication date: 2007-07-18
Anticipated expiration: 2022-07-17
Also published as: JP2004052992A

Description

【０００１】
【発明の属する技術分野】
本発明は、構築物と基礎部材の間に介装着され、構築物を地震から保護する免震装置に関する。
【０００２】
【従来の技術】
近年、建物や橋など構造部を地震等の震動から保護するために免震装置が積極的に使用されるようになってきた。この免震装置は、ゴムやスプリングを介して建造物を支承することにより、これらのゴムやスプリングの弾性力によって震動を吸収するものがほとんどであった。しかし、ゴムやスプリングは比較的劣化が速いので、長期間使用されることが前提の建造物に使用する免震装置としては、必ずしも適当ではなかった。また、大きな荷重を支承するにはかなり大型化してしまうと共に限度があり、この大きな荷重を分散して支承するするために多数の免震装置が必要となっていた。
【０００３】
そこで、この問題を解決する手段として、特開平１０−６１２５０号公報に示すような免震装置があった。この免震装置は、一方向から見て左右対称で中心部が最も深く且つ外側の勾配が大きい断面形状を有する凹状面を備えた支持部材２個を凹状面を向かい合わせにして上下に配置し、上記視方向に沿って水平に配置される１本の円柱状ローラを両凹状面の間に介在させた状態で重ねることにより耐震ユニットを構成し、この耐震ユニットをローラの軸が直交する向きに上下に２段に重ねて配置したものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、上述した従来の免震装置は、横方向の揺れ斜め方向の揺れに対しては効果的に免震機能を発揮するが、直下型の地震のように垂直方向の瞬間的な衝撃に対しては効果的に機能せず、地面の衝撃がそのまま構造物に伝達して、構造物に衝撃を与えてしまうという不具合があった。
【０００５】
また、横揺れ方向に対しても、一つの耐震ユニットは、ローラの軸が直交する方向の横揺れに対して効果があるので、ローラの軸方向の揺れに対しては、ローラの軸が直交する向きに上下に２段に重ねて配置しなければならず、構造が複雑になると共にコストもかかるという問題もあった。
【０００６】
さらに、橋などのようにスパンの長い構造物は、地震時において長手方向の移動距離が大きくなるので、それに対処するには水平方向に複数本のローラを必要とし、一層構造が複雑になると共にコストもかかるという問題もあった。
【０００７】
本発明は上述した従来の問題点に鑑みなされたもので、垂直方向の衝撃を吸収し、橋などのようにスパンの長い構造物に対しても簡単な構造であらゆる方向の揺れに対応できる免震装置を提供するものである。
【０００８】
【課題を解決するための手段】
本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に支持される下側部材と、前記上側部材と前記下側部材との間に介装された転動部材と、前記転動部材の姿勢保持手段とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は断面が略楕円のボール状に形成され、前記上側部材と前記転動部材が当接する第１当接面と、前記下側部材と前記転動部材の当接する第２当接面は、垂線位置が異なることを特徴とするものである。
【０００９】
また、本発明における転動部材の姿勢保持手段は、前記転動部材の表面に形成されたインボリュートギヤと、前記上側部材および前記下側部材の内面に形成された前記インボリュートギヤと歯合するラック状ギヤと、前記上側部材の外側に装着された弾性部材であることを特徴としている。
【００１０】
また、本発明における転動部材の姿勢保持手段は、前記転動部材を横方向に貫通する支持部材と、前記支持部材の両側を支持する弾性フランジであることを特徴ととしてもよい。
【００１１】
また、本発明における転動部材の姿勢保持手段は、前記転動部材を軸方向に貫通する支持部材と、前記支持部材の両端部に形成された回り止め部と、前記回り止め部を固定する弾性固定部材であることを特徴とすることもできる。
【００１２】
また、本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に支持される下側部材と、前記上側部材と前記下側部材との間に介装された転動部材とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は断面が略楕円のボール状に形成されると共に表面にインボリュート歯車が、前記上側部材および前記下側部材と前記転動部材の内面には前記インボリュート歯車と歯合するラック状歯車が形成され、前記上側部材と前記転動部材が当接する第１当接面と前記下側部材と前記転動部材の当接する第２当接面は、垂線位置が異なることを特徴とする。
【００１３】
また、本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に固定される下部部材と、前記上側部材および前記下側部材との間に介装された転動部材と、前記転動部材を横方向に貫通する支持部材と、前記支持部材の両側を支持する弾性フランジと、前記上側部材および前記下側部材の両側に装着された弾性部材とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は断面が略楕円のボール状に形成され、前記上側部材と前記転動部材が当接する第１当接面と前記下側部材と前記転動部材の当接する第２当接面は、垂線位置が異なることを特徴としてもよい。
【００１４】
また、本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に支持される下部部材と、前記上側部材および前記下側部材との間に介装された転動部材と、前記転動部材を軸方向に貫通する支持部材と、前記支持部材の端部に形成された回り止め部と、前記回り止め部を支承する弾性部材と、前記上側部材および前記下側部材の両側に装着された弾性部材とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は略偏平した紡錘子状に形成され、前記上側部材と前記転動部材が当接する第１当接面と前記下側部材と前記転動部材の当接する第２当接面は、垂線位置が異なることを特徴とすることもできる。
【００１５】
さらに、本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に支持される下部部材と、前記上側部材および前記下側部材との間に介装された転動部材と、前記上側部材および前記下側部材を支持する弾性部材とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は略偏平で両端に直線部を有する端部を備えた球体に形成され、前記転動部材の支持部材が前記上側部材または前記下側部材と当接するまでは、前記転動部材と前記上側部材または前記下側部材の間で転がり摩擦で動作し、前記転動部材の支持部材が前記上側部材または前記下側部材と当接した後は、前記転動部材と前記上側部材または前記下側部材の間で滑り摩擦で動くことを特徴とするものである。
【００１６】
【発明の実施の形態】
本発明に係る免震装置の実施の形態を図に基づいて説明する。
図１は本発明に係る免震装置の第１の実施の形態を示す断面図、図２は図１の免震装置の断面構造を示す側面図、図３は図１の免震装置の作動状態を示す断面図、図４は本発明の免震装置の第２の実施の形態を示す断面図、図５は図４の免震装置の作動状態を示す断面図、図６は本発明の免震装置の第３の実施の形態の要部を示す斜視図、図７は図６の免震装置の断面構造を示す側面図、図８は図６の免震装置の作動状態を示す断面図、図９は図６の免震装置の作動状態を示す断面図、図１０は本発明の免震装置の第４の実施の形態を示す側面図、図１１は図１０の免震装置の作動状態を示す側面図である。
【００１７】
本発明の免震装置の第１の実施の形態である免震装置Ａは、図１乃至図３に示すように、上部構造物１に固定される上側部材３と、基礎部材２に支承される下側部材４と、前記上側部材３と下側部材４の間に介装された転動部材５と、前記転動部材５の姿勢保持手段とを有する免震装置である。この免震装置Ａは、構造物１と基礎部材２の間に適当個数設置されるものである。
【００１８】
この免震装置Ａは、前記上側部材３および下側部材４と前記転動部材５の当接面は曲面に形成されており、前記転動部材５は断面が略楕円のボール状に形成されている。そして、前記転動部材５の表面にはインボリュートのギヤ５ａが形成されており、上側部材３および下側部材４の内面にはインボリュート歯車５ａに歯合するインボリュートのラック状ギヤ３ａ，４ａが形成されている。前記転動部材５と前記上側部材３が当接する第１当接面Ｐ１と、前記転動部材５と下側部材４が当接する第２当接面Ｐ２は、垂線位置が異なるように転動部材５が後述する姿勢保持手段により保持されている。
【００１９】
この転動部材５の姿勢保持手段は、転動部材５の表面に形成されたインボリュートのギヤ５ａと、前記上側部材３および前記下側部材４の内面に形成された前記ラック状ギヤ３ａ，４ａと、上側部材３の外側に装着された弾性部材６，７により構成されている。即ち、弾性部材６，７は、後述するように、上側部材３と下側部材４の端部には上側部材３と下側部材４の動きを規制するすることにより、転動部材５の姿勢を保持するものである。そして、図１に示すように、図中前後方向の端部にも弾性部材６，７と同様の弾性部材８，９が装着されている、さらに、これらの弾性部材を取り囲むようにカバー部材１０が被着されている。
【００２０】
また、前記転動部材５の表面に形成されたインボリュートギヤ５ａと、上側部材３と下側部材４に形成されたラック状ギヤ３ａ，４ａにより、転動部材５と上側部材３、下側部材４との関係は歯車のラックとピニオンの関係となり、転動部材５は上側部材３と下側部材４の内面に沿って自由に転動可能となる。さらに、転動部材５は断面が略楕円のボール状に形成されているので、図中の左右方向の転動のみならず、前後方向の転動も可能となるものである。
【００２１】
これらの上側部材３、下側部材４、転動部材５、カバー部材１０には、鉄系の金属材料で構成される。これらの部材を鉄系の金属材料で構成する理由は、免震装置の耐久性を向上させるためである。従って、上側部材３、下側部材４、転動部材５、カバー部材１０は鉄系の金属材料に限定されるものではなく、例えばセラミック材料やアルミニウム合金などの剛性の高い種々の材料を使用することができる。また、転動部材５と上側部材３および下側部材４の当接面は、動作を滑らかにするためコーテング処理を行うことができる。さらに、弾性部材６，７，８，９は耐久性の高めたスチールベルト入りのシリコンゴムなどを使用するものである。
【００２２】
このように構成された免震装置Ａは、初期状態においては、図２に示すように、転動部材５と前記上側部材３が第１当接面Ｐ１で当接し、転動部材５と下側部材４は第２当接面Ｐ２で当接している。従って、第１当接面Ｐ１の垂線位置と第２当接面Ｐ２の垂線位置は異なるものである。そのため、この状態においては、上部構造物１からの第１当接面Ｐ１で働く荷重Ｆ１は、転動部材５を下向きに押し下げる荷重となるが、転動部材５が上側部材３に歯合しているために、上側部材３を図中右方向に移動させる荷重Ｆ１１となるものである。そして、この上側部材３の荷重Ｆ１１は弾性部材６により規制され、位置がほじされる。
【００２３】
また、同様に、第１当接面Ｐ１で転動部材５に加えられた下向きの荷重Ｆ１は、転動部材５に対する図中時計方向の回転トルクＦ１２となる。そのため、第２当接面Ｐ２では第１当接面Ｐ１と逆方向の荷重となり回転トルクＦ２２となる。そのため転動部材５と歯合している下側部材４は、図中左方向の荷重Ｆ２１を受け左側に移動しようとするが、弾性部材７により規制されるものである。即ち、垂直方向の荷重は、横方向の荷重に分散されるので、見かけ上、直接上下方向の抵抗がなくなるので、上下方向の衝撃などに対する応答が非常に早くなる。
【００２４】
このように構成された免震装置Ａは、例えば直下型の地震により、垂直方向の衝撃を受けた場合は、図３に示すように、第２当接血Ｐ２により転動部材５に伝達され、転動部材５に対して上向きの荷重Ｆ２が働くと同時に、第２当接面Ｐ２を中心として転動部材５に時計回り方向のトルクＦ２２′を生じさせるので、転動部材５は、時計回り方向に転動する。すると、下側部材４を図中左方向に移動する荷重Ｆ１２′を生じるが、弾性部材６が変形することによりこの荷重Ｆ１２′を吸収するものである。また、同時に転動部材５が転動すると、第１当接面Ｐ１では転動部材５歯合している上側部材３を右方向に移動させる荷重Ｆ１１′が発生するが、弾性部材６が変形することにより、その衝撃荷重を吸収するものである。
【００２５】
上述のように免震装置Ａは、垂直方向の衝撃的な荷重に対して効果的な免震機能を発揮するが、通常の横揺れに対しても転動部材５と上側部材３および下側部材４が相対的に移動することにより、免震効果を発揮するものである。さらに、転動部材５は断面が略楕円のボール状に形成され上側部材３および下側部材４との当接面は曲面に形成されているので、この免震装置Ａが１組で左右方向だけでなく、前後方向の揺れに対しても効果を発揮するものである。
【００２６】
次に、図４および図５は、本発明に係る免震装置の第２の実施の形態を示すものである。この免震装置Ｂは、上部構造物１に固定される上側部材１１と、下部構造物２に固定される下側部材１２と、前記上側部材１１と前記下側部材１２との間に介装された転動部材１３と、前記転動部材を横方向に貫通する指示部材１４と、前記上部構造物１と前記下部構造物２との間に介装され前記指示部材の両端を固定する弾性部材１５，１６とを有する免震装置である。そして、指示部材１４の両側に転動部材１３の姿勢保持手段となる弾性フランジ１７，１８が装着されている。
【００２７】
また、前記上側部材１１および前記下側部材１２と前記転動部材１３の当接面１１ａ，１２ａは、曲面に形成され、前記転動部材１３は、断面が略楕円の球状に形成され、前記上部構造物と前記転動部材が当接する第１当接面Ｐ３と前記下部構造物と前記転動部材の当接する第２当接面Ｐ４は、垂線位置が異なることを特徴とするものである。また、弾性部材１５，１６の外側には前記下側部材１２と一体に形成されたガバー部材１９が被着されている。
【００２８】
このように構成された免震装置Ｂは、図４に示すように、初期状態において、転動部材１３と前記上側部材１１が第１当接面Ｐ３で当接し、転動部材１３と下側部材１２は第２当接面Ｐ４で当接するように、指示部材１４と弾性部材１５，１６により規制されている。従って、第１当接面Ｐ３の垂線位置と第２当接面Ｐ４の垂線位置は異なるものである。そのため、この状態においては、上部構造物から上側部材１１への荷重は第１当接面Ｐ３で下向きの荷重Ｆ３となり、転動部材１３を時計方向へ回転させるトルクＦ３２となる。このトルクＦ３２は指示部材１４も伝達され、指示部材１４を押し下げる荷重Ｆ３１なるが、弾性フランジ１７で規制されているため、転動部材１３はこの姿勢を保持するものである。
【００２９】
また、同様に、第１当接面Ｐ３で転動部材１３に発生した転動部材１３を回転させるトルクＦ３２は、転動部材１３の反対側の第２当接面Ｐ４では第１当接面Ｐ３と逆方向の荷重となり回転トルクＦ４２となる。そのため指示部材１４を規制している弾性フランジ１８に対しては上向きの応力荷重Ｆ４１として作用するが、弾性フランジ１８に吸収される。
【００３０】
このように構成された免震装置Ｂは、例えば直下型の地震により、垂直方向の衝撃を受けた場合は、図５に示すように、第２当接面Ｐ４により転動部材１３に伝達され、転動部材１３に対して上向きの荷重Ｆ４′が働くと同時に、第２当接面Ｐ４を中心として転動部材１３に時計回り方向のトルクＦ４２′を生じさせる。そのため、転動部材１３に時計回り方向に転動し、転動部材１３に当接している上側部材１１は、図中右方向に移動し弾性部材１５に当たって弾性部材１５を変形させることにより、そのエネルギーを吸収され、衝撃が緩和され揺れが抑えられる。
【００３１】
また、転動部材１３が転動すると、指示部材１４により弾性フランジ１８には上向きの荷重Ｆ４１′が作用し、弾性フランジ１７には下向きの荷重Ｆ３１′が作用するが、弾性フランジ１７と弾性フランジ１８が変形することにより、衝撃を吸収するものである。
【００３２】
上述した免震装置Ｂは、免震装置Ａと同様に、垂直方向の衝撃的な荷重に対して効果的な免震機能を発揮するが、通常の横揺れに対しても転動部材１３と上側部材１１および下側部材１２が相対的に移動することにより、免震効果を発揮するものである。さらに、転動部材１３は断面が略楕円のボール状に形成され、上側部材１１および下側部材１２との当接面は曲面に形成されているので、この免震装置Ａが１組で左右方向だけでなく、前後方向の揺れに対しても効果を発揮するものである。
【００３３】
次に、図６乃至図９は、本発明に係る免震装置の第３の実施の形態を示すものである。この免震装置Ｃは、上部構造物１に固定される上側部材２１と、基礎部材２に固定される下部部材２２と、前記上側部材２１および前記下側部材２３との間に介装された転動部材２３と、前記転動部材２３を軸方向に貫通する支持部材２４と、前記支持部材２４の端部に形成された回り止め部材２５，２６と、前記支持部材の端部を支承する弾性フランジ２７，２８と、前記上側部材２１および前記下側部材２３の両端に装着された弾性部材２９，３０を有する免震装置である。
【００３４】
また、この免震装置Ｃは、前記上側部材２１および前記下側部材２２と前記転動部材２３の当接面は曲面に形成され、前記転動部材２３は略偏平した中心部の径が太い紡錘子（スピンドル）状に形成され、前記上側部材２１と前記転動部材２３が当接する第１当接面Ｐ５と前記下側部材２２と前記転動部材２３の当接する第２当接面Ｐ６は、垂線位置が異なるように構成されている。このような姿勢に転動部材２３を保持するために、姿勢保持手段が備えられている。この姿勢保持手段は、前記転動部材２３を軸方向に貫通する支持部材２４と、前記支持部材２４の両端部に形成された回り止め部２５，２５と、この回り止め部２５，２５を固定する弾性固定部材２７，２８である。
【００３５】
このように構成された免震装置Ｃは、図８に示すように、初期状態において、第１当接面の垂線位置と第２当接面の垂線位置は異なるように、転動部材２３と前記上側部材２１が第１当接面Ｐ５で当接し、転動部材２３と下側部材２２は第２当接面Ｐ６で当接するように、指示部材１４と弾性フランジ２７，２８により規制されている。即ち、垂直方向の荷重は、横方向の荷重に分散されるので、見かけ上、直接上下方向の抵抗がなくなるので、上下方向の衝撃などに対する応答が非常に早くなる。
【００３６】
このように構成された免震装置Ｃは、例えば直下型の地震により、垂直方向の衝撃を受けた場合は、図９に示すように、第２当接面Ｐ６により転動部材２３に伝達され、転動部材２３に対して上向きの荷重Ｆ６′が働くと同時に、第２当接面Ｐ６を中心として転動部材２３に時計回り方向のトルクＦ６２′を生じさせる。そのため、転動部材２３は時計回り方向に転動するので、第１当接面Ｐ５で転動部材２３に当接している上側部材２１は、荷重Ｆ５１′により図中右方向に移動するが、弾性部材３０に当たって弾性部材３０を変形させることにより、そのエネルギーを吸収され、衝撃が緩和され揺れが抑えられる。
【００３７】
また、転動部材２３が回転すると、指示部材２４にも回転トルクが生じて回り止め部材２５，２６を回転させるので、図７に示す弾性フランジ２７，２８を変形させる応力が発性し、弾性フランジ２７，２８が変形することにより、衝撃を吸収するものである。
【００３８】
上述した免震装置Ｃは、免震装置Ａ、免震装置Ｂと同様に、垂直方向の衝撃的な荷重に対して効果的な免震機能を発揮するが、通常の横揺れに対しても転動部材２３と上側部材２１および下側部材２２が相対的に移動することにより、免震効果を発揮するものである。さらに、転動部材２３は紡錘子状に形成され、上側部材２１および下側部材２２との当接面は曲面に形成されているので、この免震装置Ａが１組で左右方向だけでなく、前後方向の揺れに対しても効果を発揮するものである。
【００３９】
さらに、図１０および図１１は、本発明に係る免震装置の第４の実施の形態を示すものである。この免震装置Ｄは、上部構造物１に固定される上側部材３１と、基礎部材２に支持される下側部材３２と、前記上側部材３１および前記下側部材３２との間に介装された転動部材３３と、上側部材３１および下側部材３２の両側を支持する弾性部材とを有する免震装置である。
【００４０】
この免震装置Ｄは、前記上側部材３１および前記下側部材３２と前記転動部材３３の当接面は曲面に形成され、前記転動部材３３は略偏平で両端に直線部を有する端部３４を備えた球体に形成され、前記転動部材３３の端部３４が前記上側部材３１または前記下側部材３２と当接するまでは、前記転動部材３３と前記上側部材３１または前記下側部材３２の間で転がり摩擦で動作するものである。そして、前記転動部材３３の端部３４が前記上側部材３１または前記下側部材３２と当接した後は、前記転動部材３３と前記上側部材３１または前記下側部材３２の間で滑り摩擦で動く構成としたものである。
【００４０】
このように構成された免震装置Ｄは、前記転動部材３３の端部３４が前記上側部材３１または前記下側部材３２と当接するまでは、転動部材３３は抵抗の少ない転がり摩擦で動作を行うことができるので、比較的自由に、しかも素早く動くことができるものである。しかしながら、端部３４が前記上側部材３１または前記下側部材３２と当接した後は、前記転動部材３３は、端部３４がつっかえて転がり動作を行うことができないので、前記上側部材または前記下側部材の間で滑り摩擦で動くものである。
【００４１】
このことは、即ち、初期段階における衝撃的な振動に対しては素早く反応するが、ある程度以上おおきな揺れに対しては、その揺れに対して抗するようになり、構造物の揺れを抑える作用を行うものである。そのため、あるレベルまたは限界以上の揺れに対して急激に抵抗を大きくし、制震作用を発揮するものである。
【００４２】
尚、本発明の免震装置は、上述した実施の形態に限定されるものではなく、特許請求の範囲内において様々な態様が可能なことは勿論である。例えば、上側部材、下側部材、弾性部材、支持部材の形状や寸法は特に限定されたものではなく、使用される構造物や場所に応じた最適なものが選択できるものである。また、転動部材と上側部材および下側部材の当接面の曲面形状や回り止め部材の大きさは実験結果などにより、最適なものを選択できることは勿論である。
【００４３】
【発明の効果】
以上のように、本発明の免震装置は、上部構造物に固定される上側部材と、基礎部材に支持される下側部材と、前記上側部材と前記下側部材との間に介装された転動部材と、前記転動部材の姿勢保持手段とを有する免震装置であって、前記上側部材および前記下側部材と前記転動部材の当接面は曲面に形成され、前記転動部材は断面が略楕円のボール状に形成され、前記上側部材と前記転動部材が当接する第１当接面と、前記下側部材と前記転動部材の当接する第２当接面は、垂線位置が異なる構成としたことにより、直下型地震に対しても衝撃を吸収することができるので、上部構造物を地震の被害より保護することができる。
【００４４】
また、前記転動部材の形状が断面が略楕円の球状に形成されているので、一つの免震装置で、あらゆる方向の揺れに対しても効果を発揮することができ、簡単な構造で優れた効果を発揮できる免震装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の免震装置の第１の実施の形態の要部を示す斜視図である。
【図２】図１の免震装置の断面構造を示す側面図である。
【図３】図１の免震装置の作動状態を示す断面図である。
【図４】本発明の免震装置の第２の実施の形態を示す断面図である。
【図５】図４の免震装置の作動状態を示す断面図である。
【図６】本発明の免震装置の第３の実施の形態の要部を示す斜視図である。
【図７】図６の免震装置の断面構造を示す側面図である。
【図８】図６の免震装置の作動状態を示す断面図である。
【図９】図６の免震装置の作動状態を示す断面図である。
【図１０】本発明の免震装置の第４の実施の形態の要部を示す側面図である。
【図１１】図１０の免震装置の作動状態を示す側面図である。
【符号の説明】
Ａ免震装置
Ｂ免震装置
Ｃ免震装置
１上部構造物
２基礎部材
３上側部材
３ａラック状ギヤ
４下側部材
４ａラック状ギヤ
５転動部材
５ａインボリュートギヤ
６弾性部材
７弾性部材
８弾性部材
９弾性部材
１１上側部材
１２下側部材
１３転動部材
１４支持部材
１５弾性部材
１６弾性部材
１７弾性フランジ
１８弾性フランジ
１９カバー部材
２１上側部材
２２下側部材
２３転動部材
２４支持部材
２５回り止め部材
２６回り止め部材
２７弾性固定部材
２８弾性固定部材
３１上側部材
３２下側部材
３３転動部材
３４支持部材
３５弾性部材
３６弾性部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device that is interposed between a structure and a foundation member and protects the structure from an earthquake.
[0002]
[Prior art]
In recent years, seismic isolation devices have been actively used to protect structural parts such as buildings and bridges from vibrations such as earthquakes. Most of the seismic isolation devices absorb the vibration by the elastic force of these rubbers and springs by supporting the building through rubbers and springs. However, since rubbers and springs deteriorate relatively quickly, they are not necessarily suitable as seismic isolation devices for buildings that are supposed to be used for a long period of time. Further, in order to support a large load, the size is considerably increased and there is a limit, and a large number of seismic isolation devices are required to distribute and support the large load.
[0003]
Therefore, as a means for solving this problem, there has been a seismic isolation device as disclosed in JP-A-10-61250. In this seismic isolation device, two support members each having a concave surface having a cross-sectional shape that is symmetric when viewed from one direction and has the deepest central portion and a large outer gradient are arranged vertically with the concave surfaces facing each other. A seismic unit is formed by overlapping a single cylindrical roller disposed horizontally along the viewing direction in a state of being interposed between both concave surfaces. Are arranged in two layers vertically.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned conventional seismic isolation devices can effectively perform seismic isolation functions against lateral vibrations and oblique vibrations, but against vertical impacts such as direct earthquakes. However, it does not function effectively, and the impact of the ground is transmitted to the structure as it is, and the structure is impacted.
[0005]
In addition, one seismic resistant unit is also effective for rolling in the direction in which the roller axis is orthogonal to the rolling direction. Therefore, the roller axis is orthogonal to the roller axial movement. Therefore, there is a problem that the structure is complicated and the cost is increased.
[0006]
In addition, structures with long spans such as bridges have a long moving distance in the event of an earthquake. To cope with this, multiple rollers are required in the horizontal direction, which further complicates the structure. There was also a problem of cost.
[0007]
The present invention has been made in view of the above-described conventional problems, and is capable of absorbing a shock in a vertical direction and capable of dealing with a swing in any direction with a simple structure even for a structure having a long span such as a bridge. A seismic device is provided.
[0008]
[Means for Solving the Problems]
The seismic isolation device of the present invention includes an upper member fixed to the upper structure, a lower member supported by the base member, and a rolling member interposed between the upper member and the lower member. A seismic isolation device having a posture holding means for the rolling member, wherein the contact surfaces of the upper member, the lower member, and the rolling member are formed in a curved surface, and the rolling member has a substantially cross-sectional shape. The first contact surface, which is formed in an elliptical ball shape and in which the upper member and the rolling member are in contact, and the second contact surface in which the lower member and the rolling member are in contact have different perpendicular positions. It is characterized by.
[0009]
Further, the rolling member posture maintaining means in the present invention includes an involute gear formed on the surface of the rolling member, and a rack that meshes with the involute gear formed on the inner surfaces of the upper member and the lower member. And an elastic member mounted on the outside of the upper member.
[0010]
Moreover, the posture holding means for the rolling member in the present invention may be a support member that penetrates the rolling member in the lateral direction and an elastic flange that supports both sides of the support member.
[0011]
Further, the rolling member posture holding means according to the present invention fixes the support member penetrating the rolling member in the axial direction, the anti-rotation portions formed at both ends of the support member, and the anti-rotation portion. It can also be characterized by being an elastic fixing member.
[0012]
Further, the seismic isolation device of the present invention includes an upper member fixed to the upper structure, a lower member supported by the foundation member, and a roll interposed between the upper member and the lower member. A contact surface of the upper member, the lower member, and the rolling member is formed in a curved surface, and the rolling member is formed in a ball shape having a substantially elliptical cross section. In addition, an involute gear is formed on the surface, and a rack-like gear that meshes with the involute gear is formed on the inner surface of the upper member, the lower member, and the rolling member, and the upper member and the rolling member are in contact with each other. The first contact surface, the second contact surface where the lower member and the rolling member contact each other are different in perpendicular position.
[0013]
The seismic isolation device of the present invention includes an upper member fixed to the upper structure, a lower member fixed to the base member, and a rolling member interposed between the upper member and the lower member. A seismic isolation device comprising: a support member penetrating the rolling member laterally; an elastic flange supporting both sides of the support member; and an elastic member mounted on both sides of the upper member and the lower member The contact surface of the upper member and the lower member and the rolling member is formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical section, and the upper member and the rolling member The first abutting surface with which the member abuts and the second abutting surface with which the lower member and the rolling member abut may have different perpendicular positions.
[0014]
Further, the seismic isolation device of the present invention includes an upper member fixed to the upper structure, a lower member supported by the base member, and a rolling member interposed between the upper member and the lower member. A support member penetrating the rolling member in the axial direction, a rotation preventing portion formed at an end of the support member, an elastic member supporting the rotation preventing portion, the upper member, and the lower member And an elastic member mounted on both sides of the upper member, the lower member and the rolling member are formed in curved surfaces, and the rolling member is a substantially flat spindle. The first contact surface formed in the shape of a child and in contact with the upper member and the rolling member and the second contact surface in contact with the lower member and the rolling member have different perpendicular positions. You can also
[0015]
Furthermore, the seismic isolation device of the present invention includes an upper member fixed to the upper structure, a lower member supported by the base member, and a rolling member interposed between the upper member and the lower member. And an elastic member that supports the upper member and the lower member, wherein contact surfaces of the upper member, the lower member, and the rolling member are formed into curved surfaces, and The moving member is formed into a spherical body having an end that is substantially flat and has straight portions at both ends, and the rolling member and the lower member until the supporting member of the rolling member comes into contact with the upper member or the lower member. After the rolling member operates by rolling friction between the upper member or the lower member and the support member of the rolling member comes into contact with the upper member or the lower member, the rolling member and the upper member or the lower member Characterized by sliding friction between side members It is.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a seismic isolation device according to the present invention will be described with reference to the drawings.
1 is a sectional view showing a first embodiment of a seismic isolation device according to the present invention, FIG. 2 is a side view showing a sectional structure of the seismic isolation device of FIG. 1, and FIG. 3 is an operation of the seismic isolation device of FIG. FIG. 4 is a cross-sectional view showing a second embodiment of the seismic isolation device of the present invention, FIG. 5 is a cross-sectional view showing the operating state of the seismic isolation device of FIG. 4, and FIG. FIG. 7 is a side view showing the cross-sectional structure of the seismic isolation device of FIG. 6, and FIG. 8 is a cross section showing the operating state of the seismic isolation device of FIG. 6. 9, FIG. 9 is a sectional view showing the operating state of the seismic isolation device of FIG. 6, FIG. 10 is a side view showing a fourth embodiment of the seismic isolation device of the present invention, and FIG. It is a side view which shows an operation state.
[0017]
The seismic isolation device A which is the first embodiment of the seismic isolation device of the present invention is supported by an upper member 3 fixed to the upper structure 1 and a base member 2 as shown in FIGS. The seismic isolation device includes a lower member 4, a rolling member 5 interposed between the upper member 3 and the lower member 4, and posture maintaining means for the rolling member 5. An appropriate number of seismic isolation devices A are installed between the structure 1 and the foundation member 2.
[0018]
In this seismic isolation device A, the contact surfaces of the upper member 3 and the lower member 4 and the rolling member 5 are formed in a curved surface, and the rolling member 5 is formed in a ball shape having a substantially elliptical cross section. ing. An involute gear 5a is formed on the surface of the rolling member 5, and involute rack gears 3a, 4a meshing with the involute gear 5a are formed on the inner surfaces of the upper member 3 and the lower member 4. Has been. The first abutting surface P1 where the rolling member 5 and the upper member 3 abut and the second abutting surface P2 where the rolling member 5 and the lower member 4 abut are rolled so that the perpendicular positions are different. The member 5 is held by a posture holding means described later.
[0019]
The posture holding means of the rolling member 5 includes an involute gear 5a formed on the surface of the rolling member 5, and the rack gears 3a, 4a formed on the inner surfaces of the upper member 3 and the lower member 4. And the elastic members 6 and 7 attached to the outside of the upper member 3. That is, as will be described later, the elastic members 6 and 7 restrict the movement of the upper member 3 and the lower member 4 to the end portions of the upper member 3 and the lower member 4, so that the posture of the rolling member 5 is reduced. Is to hold. As shown in FIG. 1, elastic members 8 and 9 similar to the elastic members 6 and 7 are also attached to the end portions in the front-rear direction in the drawing, and the cover member 10 surrounds these elastic members. Is attached.
[0020]
Further, the involute gear 5 a formed on the surface of the rolling member 5 and the rack-like gears 3 a and 4 a formed on the upper member 3 and the lower member 4 make the rolling member 5, the upper member 3, and the lower member. 4 is a relationship between a gear rack and a pinion, and the rolling member 5 can freely roll along the inner surfaces of the upper member 3 and the lower member 4. Furthermore, since the rolling member 5 is formed in a ball shape having a substantially elliptical cross section, not only the rolling in the left-right direction in the figure but also the rolling in the front-rear direction is possible.
[0021]
These upper member 3, lower member 4, rolling member 5, and cover member 10 are made of an iron-based metal material. The reason why these members are made of an iron-based metal material is to improve the durability of the seismic isolation device. Therefore, the upper member 3, the lower member 4, the rolling member 5, and the cover member 10 are not limited to ferrous metal materials, and various rigid materials such as ceramic materials and aluminum alloys are used. be able to. Further, the contact surfaces of the rolling member 5, the upper member 3, and the lower member 4 can be subjected to a coating process in order to make the operation smooth. Further, the elastic members 6, 7, 8, and 9 use silicon rubber with a steel belt having improved durability.
[0022]
In the seismic isolation device A configured as described above, in the initial state, as shown in FIG. 2, the rolling member 5 and the upper member 3 are in contact with each other at the first contact surface P1, and the rolling member 5 and the lower member 3 are The side member 4 is in contact with the second contact surface P2. Therefore, the perpendicular position of the first contact surface P1 and the perpendicular position of the second contact surface P2 are different. Therefore, in this state, the load F1 acting on the first contact surface P1 from the upper structure 1 is a load that pushes the rolling member 5 downward, but the rolling member 5 meshes with the upper member 3. Therefore, the load F11 moves the upper member 3 in the right direction in the figure. And the load F11 of this upper side member 3 is regulated by the elastic member 6, and the position is pulled.
[0023]
Similarly, the downward load F1 applied to the rolling member 5 at the first contact surface P1 becomes a rotational torque F12 in the clockwise direction in the drawing with respect to the rolling member 5. For this reason, the load on the second contact surface P2 is opposite to that on the first contact surface P1, resulting in the rotational torque F22. Therefore, the lower member 4 meshed with the rolling member 5 tries to move to the left side by receiving a load F21 in the left direction in the figure, but is restricted by the elastic member 7. That is, since the vertical load is distributed to the horizontal load, the vertical resistance is apparently eliminated, and the response to the vertical impact becomes very fast.
[0024]
The seismic isolation device A configured as described above is transmitted to the rolling member 5 by the second contact blood P2 as shown in FIG. Since an upward load F2 is applied to the rolling member 5 and a torque F22 'in the clockwise direction is generated in the rolling member 5 around the second contact surface P2, the rolling member 5 Roll in the turning direction. As a result, a load F12 ′ that moves the lower member 4 in the left direction in the figure is generated, but the elastic member 6 is deformed to absorb the load F12 ′. Further, when the rolling member 5 rolls at the same time, a load F11 ′ for moving the upper member 3 engaged with the rolling member 5 in the right direction is generated on the first contact surface P1, but the elastic member 6 is deformed. By doing so, the impact load is absorbed.
[0025]
As described above, the seismic isolation device A exhibits an effective seismic isolation function for impact loads in the vertical direction, but the rolling member 5, the upper member 3 and the lower side also against normal rolls. The seismic isolation effect is exhibited by the relative movement of the member 4. Further, since the rolling member 5 is formed in a ball shape having a substantially elliptical cross section, the contact surfaces of the upper member 3 and the lower member 4 are formed in a curved surface. In addition to the effect of shaking in the front-rear direction.
[0026]
4 and 5 show a second embodiment of the seismic isolation device according to the present invention. The seismic isolation device B includes an upper member 11 fixed to the upper structure 1, a lower member 12 fixed to the lower structure 2, and an interposition between the upper member 11 and the lower member 12. An elastic member that is interposed between the upper structure 1 and the lower structure 2 and fixes both ends of the indicating member. A seismic isolation device having members 15 and 16. Elastic flanges 17 and 18 that serve as posture holding means for the rolling member 13 are mounted on both sides of the indicating member 14.
[0027]
Further, the contact surfaces 11a and 12a of the upper member 11, the lower member 12, and the rolling member 13 are formed in a curved surface, and the rolling member 13 is formed in a spherical shape having a substantially elliptical section. The first abutment surface P3 where the upper structure and the rolling member abut and the second abutment surface P4 where the lower structure and the rolling member abut are different in perpendicular positions. . Further, a governor member 19 formed integrally with the lower member 12 is attached to the outside of the elastic members 15 and 16.
[0028]
As shown in FIG. 4, the seismic isolation device B configured as described above has the rolling member 13 and the upper member 11 in contact with each other at the first contact surface P <b> 3 in the initial state. The member 12 is regulated by the indicating member 14 and the elastic members 15 and 16 so as to abut on the second abutting surface P4. Therefore, the perpendicular position of the first contact surface P3 and the perpendicular position of the second contact surface P4 are different. Therefore, in this state, the load from the upper structure to the upper member 11 becomes the downward load F3 on the first contact surface P3, and becomes the torque F32 that rotates the rolling member 13 in the clockwise direction. This torque F32 is also transmitted to the indicator member 14 and becomes a load F31 that pushes down the indicator member 14, but is restricted by the elastic flange 17, so that the rolling member 13 maintains this posture.
[0029]
Similarly, the torque F32 for rotating the rolling member 13 generated on the rolling member 13 on the first contact surface P3 is the first contact surface on the second contact surface P4 on the opposite side of the rolling member 13. It becomes a load in the direction opposite to P3 and becomes a rotational torque F42. Therefore, it acts as an upward stress load F41 on the elastic flange 18 that restricts the indicating member 14, but is absorbed by the elastic flange 18.
[0030]
The seismic isolation device B configured as described above is transmitted to the rolling member 13 by the second contact surface P4 as shown in FIG. At the same time, an upward load F4 ′ is applied to the rolling member 13, and at the same time, a clockwise torque F42 ′ is generated in the rolling member 13 about the second contact surface P4. Therefore, the upper member 11 that rolls in the clockwise direction on the rolling member 13 and contacts the rolling member 13 moves to the right in the drawing and hits the elastic member 15 to deform the elastic member 15, thereby Energy is absorbed, impact is reduced, and shaking is suppressed.
[0031]
When the rolling member 13 rolls, an upward load F41 'acts on the elastic flange 18 and a downward load F31' acts on the elastic flange 17 by the indicating member 14, but the elastic flange 17 and the elastic flange When 18 is deformed, the impact is absorbed.
[0032]
The seismic isolation device B described above, as with the seismic isolation device A, exhibits an effective seismic isolation function for impact loads in the vertical direction. When the upper member 11 and the lower member 12 move relatively, a seismic isolation effect is exhibited. Furthermore, since the rolling member 13 is formed in a ball shape having a substantially elliptical cross section, and the contact surfaces of the upper member 11 and the lower member 12 are formed in a curved surface, the seismic isolation device A is a pair of left and right. This is effective not only in the direction but also in the back and forth direction.
[0033]
Next, FIG. 6 thru | or FIG. 9 shows 3rd Embodiment of the seismic isolation apparatus based on this invention. The seismic isolation device C is interposed between the upper member 21 fixed to the upper structure 1, the lower member 22 fixed to the base member 2, and the upper member 21 and the lower member 23. A rolling member 23, a support member 24 that penetrates the rolling member 23 in the axial direction, anti-rotation members 25 and 26 formed at the end of the support member 24, and an end of the support member are supported. The seismic isolation device includes elastic flanges 27 and 28 and elastic members 29 and 30 attached to both ends of the upper member 21 and the lower member 23.
[0034]
Further, in this seismic isolation device C, the contact surfaces of the upper member 21 and the lower member 22 and the rolling member 23 are formed into curved surfaces, and the rolling member 23 has a substantially flat central portion with a large diameter. A first contact surface P5 that is formed in a spindle (spindle) shape and that contacts the upper member 21 and the rolling member 23, and a second contact surface P6 that contacts the lower member 22 and the rolling member 23. Are configured to have different perpendicular positions. In order to hold the rolling member 23 in such a posture, posture holding means is provided. This posture holding means fixes a support member 24 that penetrates the rolling member 23 in the axial direction, anti-rotation portions 25 and 25 formed at both ends of the support member 24, and the anti-rotation portions 25 and 25. Elastic fixing members 27 and 28.
[0035]
As shown in FIG. 8, the seismic isolation device C configured as described above is configured so that, in the initial state, the vertical position of the first contact surface and the normal position of the second contact surface are different from each other. The upper member 21 is abutted by the first abutting surface P5, and the rolling member 23 and the lower member 22 are regulated by the indicating member 14 and the elastic flanges 27 and 28 so as to abut on the second abutting surface P6. Yes. That is, since the vertical load is distributed to the horizontal load, the vertical resistance is apparently eliminated, and the response to the vertical impact becomes very fast.
[0036]
The seismic isolation device C configured as described above is transmitted to the rolling member 23 by the second contact surface P6 as shown in FIG. 9, for example, when a vertical impact is received due to a direct earthquake. An upward load F6 ′ acts on the rolling member 23, and at the same time, a torque F62 ′ in the clockwise direction is generated in the rolling member 23 around the second contact surface P6. Therefore, since the rolling member 23 rolls in the clockwise direction, the upper member 21 that is in contact with the rolling member 23 at the first contact surface P5 moves to the right in the figure by the load F51 ′. By striking the elastic member 30 and deforming the elastic member 30, the energy is absorbed, the impact is relaxed, and the shaking is suppressed.
[0037]
Further, when the rolling member 23 rotates, rotational torque is also generated in the indicating member 24 to rotate the anti-rotation members 25 and 26. Therefore, stress that deforms the elastic flanges 27 and 28 shown in FIG. The flanges 27 and 28 are deformed to absorb the impact.
[0038]
The above-described seismic isolation device C, like the seismic isolation devices A and B, exhibits an effective seismic isolation function for impact loads in the vertical direction. When the rolling member 23, the upper member 21, and the lower member 22 move relatively, a seismic isolation effect is exhibited. Furthermore, since the rolling member 23 is formed in a spindle shape, and the contact surface with the upper member 21 and the lower member 22 is formed in a curved surface, this seismic isolation device A is not only in the left-right direction but also in one set. It is also effective against back and forth shaking.
[0039]
10 and 11 show a fourth embodiment of the seismic isolation device according to the present invention. The seismic isolation device D is interposed between an upper member 31 fixed to the upper structure 1, a lower member 32 supported by the base member 2, and the upper member 31 and the lower member 32. The seismic isolation device includes the rolling member 33 and elastic members that support both sides of the upper member 31 and the lower member 32.
[0040]
In this seismic isolation device D, the contact surfaces of the upper member 31 and the lower member 32 and the rolling member 33 are formed into curved surfaces, and the rolling member 33 is substantially flat and has end portions having straight portions at both ends. Until the end 34 of the rolling member 33 comes into contact with the upper member 31 or the lower member 32, the rolling member 33 and the upper member 31 or the lower member. It operates by rolling friction between 32. After the end portion 34 of the rolling member 33 comes into contact with the upper member 31 or the lower member 32, sliding friction occurs between the rolling member 33 and the upper member 31 or the lower member 32. It is configured to move with.
[0040]
In the seismic isolation device D configured as described above, the rolling member 33 operates with a low rolling friction until the end 34 of the rolling member 33 contacts the upper member 31 or the lower member 32. Can be moved relatively freely and quickly. However, after the end portion 34 comes into contact with the upper member 31 or the lower member 32, the rolling member 33 cannot perform the rolling operation because the end portion 34 is replaced. It moves by sliding friction between the lower members.
[0041]
This means that it reacts quickly to shocking vibrations in the initial stage, but it resists the shaking to a certain degree of shaking and suppresses the shaking of the structure. Is what you do. For this reason, the resistance is suddenly increased to a certain level or more than the limit, and the damping effect is exhibited.
[0042]
In addition, the seismic isolation apparatus of this invention is not limited to embodiment mentioned above, Of course, various aspects are possible within a claim. For example, the shapes and dimensions of the upper member, the lower member, the elastic member, and the support member are not particularly limited, and an optimum member can be selected according to the structure and place to be used. Of course, the optimum curved surface shape of the contact surfaces of the rolling member, the upper member, and the lower member and the size of the anti-rotation member can be selected according to the experimental results.
[0043]
【The invention's effect】
As described above, the seismic isolation device of the present invention is interposed between the upper member fixed to the upper structure, the lower member supported by the foundation member, and the upper member and the lower member. A seismic isolation device having a rolling member and a posture holding means for the rolling member, wherein the contact surfaces of the upper member, the lower member, and the rolling member are formed into curved surfaces, and the rolling The member is formed in a ball shape having a substantially elliptical cross section, a first contact surface on which the upper member and the rolling member abut, and a second contact surface on which the lower member and the rolling member abut, By adopting a configuration with different perpendicular positions, shocks can be absorbed even for direct earthquakes, so that the upper structure can be protected from earthquake damage.
[0044]
In addition, since the shape of the rolling member is formed in a spherical shape with a substantially elliptical cross section, it can be effective against shaking in any direction with a single seismic isolation device, and is excellent in simple structure. It is possible to provide a seismic isolation device that can exert the effect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a first embodiment of a seismic isolation device of the present invention.
2 is a side view showing a cross-sectional structure of the seismic isolation device of FIG. 1. FIG.
3 is a cross-sectional view showing an operating state of the seismic isolation device of FIG. 1. FIG.
FIG. 4 is a cross-sectional view showing a second embodiment of the seismic isolation device of the present invention.
5 is a cross-sectional view showing an operating state of the seismic isolation device of FIG. 4;
FIG. 6 is a perspective view showing an essential part of a third embodiment of the seismic isolation device of the present invention.
7 is a side view showing a cross-sectional structure of the seismic isolation device of FIG. 6;
8 is a cross-sectional view showing an operating state of the seismic isolation device of FIG. 6. FIG.
9 is a cross-sectional view showing an operating state of the seismic isolation device of FIG. 6;
FIG. 10 is a side view showing an essential part of a fourth embodiment of the seismic isolation device of the present invention.
11 is a side view showing an operating state of the seismic isolation device of FIG. 10;
[Explanation of symbols]
A Seismic isolation device
B Seismic isolation device
C Seismic isolation device
1 Superstructure
2 Foundation members
3 Upper member
3a Rack gear
4 Lower member
4a Rack gear
5 Rolling members
5a Involute gear
6 Elastic members
7 Elastic members
8 Elastic members
9 Elastic members
11 Upper member
12 Lower member
13 Rolling members
14 Support members
15 Elastic member
16 Elastic member
17 Elastic flange
18 Elastic flange
19 Cover member
21 Upper member
22 Lower member
23 Rolling members
24 Support member
25 Detent member
26 Detent member
27 Elastic fixing member
28 Elastic fixing member
31 Upper member
32 Lower member
33 Rolling members
34 Support members
35 Elastic members
36 Elastic members

Claims

An upper member fixed to the upper structure, a lower member supported by the base member, a rolling member interposed between the upper member and the lower member, and maintaining the posture of the rolling member A seismic isolation device having means,
Contact surfaces of the upper member, the lower member, and the rolling member are formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and the upper member and the rolling member are in contact with each other. The seismic isolation device according to claim 1, wherein the first contact surface and the second contact surface where the lower member and the rolling member contact each other have different perpendicular positions.

The rolling member posture holding means includes an involute gear formed on a surface of the rolling member, a rack-shaped gear meshing with the involute gear formed on the inner surface of the upper member and the lower member, The seismic isolation device according to claim 1, wherein the seismic isolation device is an elastic member mounted outside the upper member.

2. The seismic isolation device according to claim 1, wherein the rolling member posture holding means is a support member that penetrates the rolling member in a lateral direction and an elastic flange that supports both sides of the support member. .

The rolling member posture holding means is a support member that penetrates the rolling member in the axial direction, a detent portion formed at both ends of the support member, and an elastic fixing member that fixes the detent portion. The seismic isolation device according to claim 1, wherein the seismic isolation device is provided.

An seismic isolation device having an upper member fixed to an upper structure, a lower member supported by a base member, and a rolling member interposed between the upper member and the lower member. ,
The contact surfaces of the upper member, the lower member and the rolling member are formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and an involute gear is formed on the surface, A rack-like gear that meshes with the involute gear is formed on the inner surface of the member, the lower member, and the rolling member, and a first contact surface that contacts the upper member and the rolling member, and the lower member And the second abutting surface with which the rolling member abuts are at different perpendicular positions.

An upper member fixed to the upper structure, a lower member fixed to the base member, a rolling member interposed between the upper member and the lower member, and the rolling member in the lateral direction A seismic isolation device having a support member penetrating; an elastic flange supporting both sides of the support member; and an elastic member mounted on both sides of the upper member and the lower member;
Contact surfaces of the upper member, the lower member, and the rolling member are formed in a curved surface, the rolling member is formed in a ball shape having a substantially elliptical cross section, and the upper member and the rolling member are in contact with each other. The seismic isolation device, wherein the first contact surface, the lower member, and the second contact surface where the rolling member abuts have different perpendicular positions.

An upper member fixed to the upper structure, a lower member supported by the base member, a rolling member interposed between the upper member and the lower member, and the rolling member in the axial direction A supporting member penetrating through, an anti-rotation portion formed at an end of the supporting member, an elastic fixing member supporting the anti-rotation device, and elastic members mounted on both sides of the upper member and the lower member. A seismic isolation device having
Contact surfaces of the upper member, the lower member, and the rolling member are formed in a curved surface, the rolling member is formed in a substantially flat spindle shape, and the upper member and the rolling member are in contact with each other. The seismic isolation device according to claim 1, wherein the first contact surface, the lower member, and the second contact surface on which the rolling member abuts have different perpendicular positions.