JP4039592B2 - Preload introduction jig and preload introduction method for laminated rubber type seismic isolation device - Google Patents

Description

【０００１】
【発明の属する技術分野】
本発明は、積層ゴム型免震装置などへの予荷重導入治具及び予荷重導入方法に関する。
【０００２】
【従来の技術】
建物を地震等の振動からまもるための構造として、建物を上部構造と下部構造とに分割してそれらの間を複数個の積層ゴム型免震装置で連結し、上部構造の重量をそれら積層ゴム型免震装置を介して下部構造で支持すると共に、下部構造から上部構造へ伝達する地震等による水平方向の振動力をそれら積層ゴム型免震装置で吸収して低減するようにした免震構造が広く採用されている。
建物の下部構造とは、例えば地盤に固定されたその建物の基礎であり、その場合の建物の上部構造とは、その基礎によって支持されるその建物の本体部分である。
積層ゴム型免震装置は、建物の上部構造と下部構造とに夫々連結される上フランジプレート及び下フランジプレートと、それら上フランジプレートと下フランジプレートとの間に設けられ鉛直荷重を支持すると共に水平方向に剪断変形可能な積層ゴム体とで構成されており、このような積層ゴム型免震装置は、単に「免震積層ゴム」と呼ばれることもあり、また「積層ゴム支承」と呼ばれることもある。以下の従来技術の説明では、これを免震積層ゴムと呼ぶことにする。
【０００３】
免震積層ゴムは、鉛直荷重に対しては大きな剛性を有する。ただし免震積層ゴムに実際に加わる鉛直荷重は一般的に極めて大きいため、その鉛直荷重によって発生する免震積層ゴムの上下方向の圧縮量（沈み込み量ともいう）は決して小さくない。多くの場合、この沈み込み量の大きさは、その免震積層ゴムを構成している積層ゴム体の無荷重時高さ寸法の１〜３割程度に相当する大きさとなる。
【０００４】
最近では、建物の新築時に免震積層ゴムを組み込むばかりでなく、既存建物に免震積層ゴムを組み込んで免震化する工事も広く行われている。このように、既存建物を免震建物に耐震改修するために行う既存建物への免震積層ゴムの組み込み（設置）工事は、免震レトロフィットと呼ばれている。
免震レトロフィットを行う際に免震積層ゴムを無荷重状態で組み込むと、設置工事が完了して免震積層ゴムに建物荷重を負担させたときに、個々の免震積層ゴムに発生する沈み込み量が大きく、また、不同によって、建物が傾いたり、建物にひび割れが発生したりするおそれがある。
そのため免震レトロフィットを行う際には、免震積層ゴムの設置工事完了後に個々の免震積層ゴムが負担することになる建物荷重の概算値を予め算出し、夫々の算出荷重の何割かを個々の免震積層ゴムの上下のフランジプレートの間に負荷して、上下方向に圧縮変形させた状態にした免震積層ゴムを建物に組み込むようにしている。このように免震積層ゴムに所望の大きさの荷重を負荷した状態にすることを、免震積層ゴムへの予荷重導入という。
【０００５】
免震積層ゴムへの予荷重導入のためには、一般的に、免震積層ゴムの上下のフランジプレートの間に複数の予荷重導入治具を架設するようにしており、従来の一般的な予荷重導入治具としては、１個のターンバックルと２本のネジ棒とから成るものがあった。この従来の予荷重導入治具を使用して行う免震積層ゴムの予荷重導入は、次のようにして行われていた。
先ず、免震積層ゴムの上フランジプレートには、その外周に沿って等間隔で複数箇所に、予荷重導入治具の一方のネジ棒を螺着するためのネジ孔を形成しておく。また、下フランジプレートには、上フランジプレートの複数のネジ孔の夫々に対応する箇所に、予荷重導入治具の他方のネジ棒を螺着するためのネジ孔を形成しておく。例えば１個の免震積層ゴムに予荷重導入治具を２個使用する場合には、上下のフランジプレートに形成するネジ孔の個数も２個ずつとし、予荷重導入治具を４個使用する場合には、ネジ孔の個数も４個ずつとしておく。
【０００６】
次に、油圧プレス機等の加圧装置を用意し、免震積層ゴムをその加圧装置に装填する。そして、その加圧装置で上フランジプレートと下フランジプレートとを挟圧し所望の圧縮荷重を加えて免震積層ゴムの積層ゴム体を圧縮することで、それらフランジプレートの間の間隔を短縮する。
更に、免震積層ゴムをこの状態を保持したままで、上下のフランジプレートの間に複数組の予荷重導入治具を架設し、それら予荷重導入治具のターンバックルを締め付けて上下のフランジプレートの相対変位を拘束する。
続いて、加圧装置を除荷すると、この加圧装置に代わって、架設した複数の予荷重導入治具が、その免震積層ゴムに導入された予荷重を保持するようになり、これによって予荷重の導入が完了する。
【０００７】
全ての免震積層ゴムを建物に設置完了したならば、建物荷重の全体をそれら免震積層ゴムに負担させるようにした上で、夫々の免震積層ゴムから予荷重導入治具を取り外す。ところが、このとき各々の免震積層ゴムに実際に加わっている建物荷重と、予め計算によって求めた夫々の予荷重との間には誤差があるため、ある免震積層ゴムでは、実際の荷重が算出荷重（即ち、その免震積層ゴムに導入した予荷重）より小さくなり、別の免震積層ゴムでは実際の荷重が算出荷重より大きくなるということはめずらしくない。
場合によっては、実際の荷重が算出荷重よりもかなり大きくなることがあり、そうなると、予荷重導入治具に甚だしく大きな軸方向の圧縮力が加わり、ターンバックルを回転させて予荷重導入治具を取り外すことが不可能になる。これはしばしば発生し、従来はこのような場合には、予荷重導入治具の一方のネジ棒をガス切断して軸方向の圧縮力を抜いた上で、その予荷重導入治具を取り外すようにしていた。
【０００８】
【発明が解決しようとする課題】
しかしながら、免震積層ゴムから予荷重導入治具を取り外すためにガス切断作業が必要であるということは、免震積層ゴムの設置作業の手間を増大させ、そのコストを押し上げる原因となる。
また、免震積層ゴムに架設されている予荷重導入治具をガス切断すると、その切断完了時に、それまでその予荷重導入治具が負担していた分の建物荷重が急激にその免震積層ゴムの積層ゴム体に加わるため、その免震積層ゴムの沈み込み量が急増する。これによって、既存建物に無理な変形が生じ、ひび割れ等を起こすおそれがあった。
本発明は上記事情に鑑みてなされたものであり、本発明の目的は、上フランジプレートと下フランジプレートとの間に複数の予荷重導入治具を架設することで予荷重を導入した積層ゴム型免震装置を建物に設置した後に、導入した予荷重を超える大きさの建物荷重がその積層ゴム型免震装置に加わるようになった場合でも、予荷重導入治具をガス切断等によって切断することを必要とせず、手作業により容易に積層ゴム型免震装置から予荷重導入治具を取り外すことができ、従って、予荷重導入治具のガス切断等による建物へのひび割れ発生等の悪影響を回避することのできる、建物への予荷重導入治具及び予荷重導入方法を提供することにある。
【０００９】
【課題を解決するための手段】
前記目的を達成するため、本発明にかかる積層ゴム型免震装置への予荷重導入治具は、建物の上部構造と下部構造とに夫々連結される上フランジプレート及び下フランジプレートと、前記上フランジプレートと前記下フランジプレートとの間に設けられ鉛直荷重を支持すると共に水平方向に剪断変形可能な積層ゴム体とを備えた積層ゴム型免震装置に予荷重を導入するための予荷重導入治具において、前記上フランジプレートと前記下フランジプレートとの一方に形成されたネジ孔と他方に形成されたネジ孔とに夫々螺合される第１雄ネジ部と第２雄ネジ部とを有し、前記第１雄ネジ部と前記第２雄ネジ部とを夫々に対応する前記フランジプレートの前記ネジ孔に螺合することで、前記上フランジプレートと前記下フランジプレートとの間に架設可能であり、前記第１雄ネジ部と前記第２雄ネジ部との間の長さが調節可能であり、前記上フランジプレートと前記下フランジプレートとの間に架設された状態において、それらフランジプレートの互いに離隔する方向への相対変位を拘束可能で、しかもそれらフランジプレートの互いに接近する方向への相対変位を許容可能に構成され、互いに同一軸心上に位置する第１部材と、第２部材と、第３部材とを含んでおり、前記第１部材は、前記軸心に沿って延在しその端部に前記第１雄ネジ部が形成されており、前記第２部材は、前記第１部材に対して前記軸心を中心として相対回転可能であり、前記第１部材に対して前記軸心に沿って第１位置と第２位置との間で相対移動可能であり、前記第１位置と前記第２位置とにおいて前記第１部材と係合可能であり、前記第３部材は、前記軸心に沿って延在しその端部に前記第２雄ネジ部が形成されており、前記第２部材と前記軸心方向において螺合し、前記第３部材と前記第２部材との螺合量を調節することで、前記第１雄ネジ部と前記第２雄ネジ部との間の長さを調節可能にし、前記上フランジプレートと前記下フランジプレートの互いに離隔する方向への相対変位の拘束は、前記第２部材が前記第１位置で前記第１部材に係合することで前記第１部材と前記第２部材との互いに離隔する方向の変位が規制されることによってなされ、前記上フランジプレートと前記下フランジプレートの互いに接近する方向への相対変位の許容は、前記第２部材が前記第１位置と前記第２位置との間で前記第１部材と前記第２部材との互いに接近する方向の変位が許容されることによってなされることを特徴とする。
また本発明にかかる積層ゴム型免震装置への予荷重導入治具は、前記第１部材は、本体部と、該本体部に固設され前記軸心に沿って延在するロッド部とを有し、前記１雄ネジ部は前記ロッド部の先端に形成され、前記第２部材は、前記軸心に対して同心関係にあるネジ孔を有し、前記第３部材は、前記軸心に沿って延在するロッド部を含んでおり、前記第２雄ネジ部は該ロッド部の第１端に形成されており、前記第２部材の前記ネジ孔と螺合する第３雄ネジ部が該ロッド部の第２端に形成され、前記第３部材と前記第２部材との螺合は、前記第３部材の第３雄ネジ部が前記第２部材のネジ孔に螺合することでなされていることを特徴とする。
また本発明にかかる積層ゴム型免震装置への予荷重導入治具は、前記第１部材の前記本体部が、前記軸心に対して同心関係にあり前記第２部材側へ延出した円筒部と、該円筒部の先端に形成された径方向外方突出部とを有し、前記第２部材が、前記軸心に対して同心関係にある円孔が形成された板部を有し、前記第１部材の前記円筒部が前記第２部材の前記円孔に挿通されており、前記第２部材の前記第１位置は、前記第１部材の前記径方向外方突出部が前記第２部材の板部の前記円孔の縁部に係合することで形成され、前記第２部材の前記第２位置は、前記第１部材の前記本体部が前記第２部材の板部に係合することで形成されることを特徴とする。
また本発明にかかる積層ゴム型免震装置への予荷重導入治具は、前記第３部材の前記ロッド部の両端に形成された前記第２雄ネジ部と前記第３雄ネジ部との一方が右ネジとして形成され、他方が左ネジとして形成されていることを特徴とする。
また本発明にかかる積層ゴム型免震装置への予荷重導入方法は、建物の上部構造と下部構造とに夫々連結される上フランジプレート及び下フランジプレートと、前記上フランジプレートと前記下フランジプレートとの間に設けられ鉛直荷重を支持すると共に水平方向に剪断変形可能な積層ゴム体とを備えた積層ゴム型免震装置に予荷重を導入する予荷重導入方法において、前記予荷重導入治具を複数用意し、加圧装置を用意し、前記加圧装置に前記積層ゴム型免震装置を装填し、前記加圧装置で前記積層ゴム型免震装置の前記上フランジプレートと前記下フランジプレートとを挟圧し所望の圧縮荷重を加えて前記積層ゴム体を圧縮することにより、前記上フランジプレートと前記下フランジプレートとの間の間隔を短縮し、前記上フランジプレートと前記下フランジプレートとの間に前記複数の予荷重導入治具を架設し、前記上フランジプレートと前記下フランジプレートとの間に架設した前記複数の予荷重導入治具の長さを調節して、前記上フランジプレートと前記下フランジプレートとの互いに離隔する方向への相対変位を拘束することを特徴とする。
また本発明にかかる予荷重導入治具は、互いに同一軸心上に位置する第１部材と、第２部材と、第３部材とを含んでおり、前記第１部材は、本体部と、該本体部に固設され前記軸心に沿って延在するロッド部とを有し、該第１部材の該ロッド部の先端に第１雄ネジ部が形成されており、前記第２部材は、前記第１部材に対して前記軸心を中心として相対回転可能であり、前記第１部材に対して前記軸心に沿って第１位置と第２位置との間で相対移動可能であり、前記第１位置と前記第２位置とにおいて前記第１部材の前記本体部と係合可能であり、前記軸心に対して同心関係にあるネジ孔を有し、前記第３部材は、前記軸心に沿って延在するロッド部を含んでおり、該ロッド部の第１端に第２雄ネジ部が形成されており、該ロッド部の第２端に前記第２部材の前記ネジ孔と螺合する第３雄ネジ部を有し、前記第３部材の前記第３雄ネジ部と前記第２部材の前記ネジ孔との螺合量を調節することで、前記第１雄ネジ部と前記第２雄ネジ部との間の長さを調節可能にし、前記第１雄ネジ部と前記第２雄ネジ部の互いに離隔する方向への相対変位を拘束可能で、しかもそれら前記第１雄ネジ部と前記第２雄ネジ部の互いに接近する方向への相対変位を許容可能に構成され、前記第１雄ネジ部と前記第２雄ネジ部の互いに離隔する方向への相対変位の拘束は、前記第２部材が前記第１位置で前記第１部材に係合することで前記第１部材と前記第２部材との互いに離隔する方向の変位が規制されることによってなされ、前記第１雄ネジ部と前記第２雄ネジ部の互いに接近する方向への相対変位の許容は、前記第２部材が前記第１位置と前記第２位置との間で前記第１部材と前記第２部材との互いに接近する方向の変位が許容されることによってなされることを特徴とする。
また本発明にかかる予荷重導入治具は、前記第１部材の前記本体部が、前記軸心に対して同心関係にあり前記第２部材側へ延出した円筒部と、該円筒部の先端に形成された径方向外方突出部とを有し、前記第２部材が、前記軸心に対して同心関係にある円孔が形成された板部を有し、前記第１部材の前記円筒部が前記第２部材の前記円孔に挿通されており、前記第２部材の前記第１位置は、前記第１部材の前記径方向外方突出部が前記第２部材の板部の前記円孔の縁部に係合することで形成され、前記第２部材の前記第２位置は、前記第１部材の前記本体部が前記第２部材の板部に係合することで形成されることを特徴とする。
また本発明にかかる予荷重導入治具は、前記第３部材の前記ロッド部の両端に形成された前記第２雄ネジ部と前記第３雄ネジ部との一方が右ネジとして形成され、他方が左ネジとして形成されていることを特徴とする。
【００１０】
本発明にかかる積層ゴム型免震装置への予荷重導入治具及び予荷重導入方法ならびに予荷重導入治具によれば、上フランジプレートと下フランジプレートとの間に複数の予荷重導入治具を架設することで予荷重を導入した積層ゴム型免震装置を建物に設置した後に、導入した予荷重を超える大きさの建物荷重がその積層ゴム型免震装置に加わるようになった場合でも、上下のフランジプレートの間の間隔が何ら支障なく短縮し、その際にそれらフランジプレートから予荷重導入治具へ圧縮荷重が作用することがない。従って、そのような場合でも、予荷重導入治具をガス切断等によって切断することを必要とせず、手作業により容易に積層ゴム型免震装置から予荷重導入治具を取り外すことができる。従って、従来のターンバックルを使用した予荷重導入治具のように、予荷重導入治具をガス切断せねばならないために、建物にひび割れ発生等の悪影響が及ぶということがない。
【００１１】
【発明の実施の形態】
以下に本発明の実施の形態について添付図面を参照して説明する。
図１は、本発明の実施の形態にかかる予荷重導入治具を上フランジプレートと下フランジプレートとの間に架設した積層ゴム型免震装置の側面図、図２のａ、ｂ、ｃは、図１の予荷重導入治具を構成する部材を個別に示した図、図３のａ及びｂは、積層ゴム型免震装置の上フランジプレートと下フランジプレートとの間隔が狭まったときの予荷重導入治具の作用を説明するための、図１の予荷重導入治具の要部断面図である。
【００１２】
図１に示した積層ゴム型免震装置１０（以下「免震積層ゴム」という）は、建物の上部構造と下部構造との間に配設され、上部構造の重量を支持する一方で、下部構造から上部構造へ伝達する地震等による水平方向の振動力を吸収して低減する機能を果たすものである。
図中には建物を示していないが、建物の下部構造とは、例えば地盤に固定されたその建物の基礎等であり、またその場合の上部構造とは、その基礎によって支持されるその建物の本体部分である。ただし、周知のごとく、この種の免震積層ゴムは、建物を基礎よりかなり上の部分で分割してその分割部分に配設することもある。
いずれの場合にも、その建物の上部構造と下部構造との間を複数個の免震積層ゴム１０で連結し、上部構造の重量をそれら免震積層ゴム１０を介して下部構造で支持すると共に、下部構造から上部構造へ伝達する地震等による水平方向の振動力をそれら免震積層ゴム１０で吸収して低減できるようにすることで、免震構造を構成することができる。
【００１３】
免震積層ゴム１０は、建物の上部構造に連結される上フランジプレート１２と、建物の下部構造に連結される下フランジプレート１４と、それらフランジプレート１２と１４との間に設けられた積層ゴム体１６とを備えている。
積層ゴム体１６は、水平方向に延在する円板形の複数のゴム板層と複数の鋼板層とを交互に上下方向に積層して円筒体を形成し、その円筒体の側面を被覆ゴム層で覆った公知構造のものであり、鉛直荷重を支持するための高い鉛直剛性を有する一方で、水平方向には剪断変形可能であり、その水平方向の剪断変形によって上フランジプレート１２と下フランジプレート１４との相対的な水平方向変位を許容するものである。
【００１４】
既述の如く、免震積層ゴム１０は鉛直荷重に対して大きな剛性を有するが、免震積層ゴム１０に実際に加わる鉛直荷重は一般的に極めて大きいため、その鉛直荷重によって発生する免震積層ゴム１０の上下方向の圧縮量（沈み込み量）は決して小さくない。そこで、主として、免震レトロフィットの際にこの沈み込み量によって不都合が発生するのを防止する等の目的で、免震積層ゴム１０への予荷重導入が行われる。本発明においては、この予荷重導入のために、免震積層ゴム１０の上フランジプレート１２と下フランジプレート１４との間に、複数の予荷重導入治具２０を架設するようにしている。
【００１５】
予荷重導入治具２０を架設するために、免震積層ゴム１０の上フランジプレート１２には、その外周に沿って等角度間隔で複数箇所に、予荷重導入治具２０を螺合連結するためのネジ孔１２ａが形成されている。また、下フランジプレート１４には、上フランジプレート１２のそれら複数のネジ孔１２ａの夫々の直下の位置に、同じく予荷重導入治具２０を螺合連結するためのネジ孔１４ａが形成されている。
それら連結用ネジ孔１２ａ、１４ａの個数は、この免震積層ゴム１０に架設する予荷重導入治具２０の個数（これは免震積層ゴム１０に導入する予荷重の大きさや、１個の予荷重導入治具２０の最大引張荷重等に応じて決められる）に等しく、例えば１個の免震積層ゴム１０に予荷重導入治具２０を２個使用するのであれば、それら連結用ネジ孔１２ａ、１４ａの個数は２個ずつとして１８０°間隔で形成し、また、予荷重導入治具２０を４個使用するのであれば、４個ずつとして９０°間隔で形成する。
【００１６】
予荷重導入治具２０は、その全体形状が棒状であり、その両端に、第１雄ネジ部２２と第２雄ネジ部２４とを有する。第１雄ネジ部２２を上フランジプレート１２の連結用ネジ孔１２ａと下フランジプレート１４の連結用ネジ孔１４ａとの一方に螺合し、第２雄ネジ部２４を他方に螺合することで、この予荷重導入治具２０を上フランジプレート１２と下フランジプレート１４との間に架設することができる。
また、予荷重導入治具２０は、後述するように、第１雄ネジ部２２と第２雄ネジ部２４との間の長さが調節可能に構成されている。
更に、予荷重導入治具２０は、上下のフランジプレート１２、１４の間に架設された状態において、それらフランジプレート１２、１４の互いに離隔する方向への相対変位を拘束可能で、しかもそれらフランジプレート１２、１４の互いに接近する方向への相対変位を許容可能に構成されている。
【００１７】
図示の実施の形態においては、予荷重導入治具２０のこれら機能を、以下に説明する具体的な構成によって得ている。
先ず、予荷重導入治具２０は、互いに同一軸心ＡＸ上に位置する第１部材２６と、第２部材２８と、第３部材３０とを含んでいる。図１に示した予荷重導入治具２０は、それら３つの部材２６、２８、３０が互いに組み付けられた状態を示したものであり、図２のａ、ｂ、ｃは、それら３つの部材２６、２８、３０を個別に示したものである。ただし、以下の説明から明らかなように、第１部材２６と第２部材２８とは、予荷重導入治具２０を一旦組み立てた後には互いに分離することはない。
【００１８】
図２のａに示すように、第１部材２６は、本体部３２と、この本体部３２に固設され軸心ＡＸに沿って延在するロッド部３４とを有し、この第１部材２６のロッド部３４の先端に前述の第１雄ネジ部２２が形成されている。
第１部材２６は５個の部品（第１部品２６ａ〜第５部品２６ｅ）を溶接等により組み付けて構成したものである。尚、図２のａは、上面図と断面側面図とを組み合せて示した図である。
第１部品２６ａは、軸心ＡＸと同心的に配設される略々円筒径の部品であり、その外周面に平面を４面形成してあり、それら平面にレンチを係合させて回転させることができるようにしてある。また、第１部品２６ａは、軸心ＡＸと同心的な貫通孔が形成されており、この貫通孔の上端部及び下端部は、ザグリによって大径部としてある。第１部品２６ａは更に、その下面に、第４部品２６ｄの上面が当接する浅いザグリ面が形成されている。
第２部品２６ｂは、六角孔付きボルトであり、この六角孔付きボルトの軸部が第１部品２６ａの貫通孔に下方から嵌挿される。
【００１９】
第３部品２６ｃは、軸心ＡＸと同心的に配設される略々円筒形の部品であり、その上端に径方向外方へ突出したフランジ部４０が形成され、また、その中心に軸心ＡＸと同心的にネジ孔が形成されている。
この第３部品２６ｃを、後述する第２部材２８の第１部品２８ａの円孔に挿通した上で、第１部品２６ａの中心孔に上方から嵌挿し、六角孔付きボルト（第２部品）２６ｂの軸部をこの第３部品２６ｃのネジ孔に螺合させて、その六角孔付きボルト２６ｂの上端とこの第３部品２６ｃのネジ孔の上端とを溶接するようにしている。これによって第１部品２６ａと、第２部品２６ｂと、第３部品２６ｃとが組み付けられる。
第３部品２６ｃの外周面は、第２部材２８の第１部品２８ａの円孔４２の内周面と滑らかに摺接するように表面処理してある。また、この第３部品２６ｃの上端のフランジ部４０の下面は、後述するように第２部材２８の第１部品２８ａの上面と当接することのある面であり、それらの面が当接して摺接する際にそれらが滑らかに摺接するように、このフランジ部４０の下面も表面処理してある。
【００２０】
第４部品２６ｄは、軸心ＡＸと同心的に配設される略々円筒形の部品であり、その中心に軸心ＡＸと同心的にネジ孔が形成されている。この第４部品２６ｄの上端面を第１部品２６ａの下面の前述の浅いザグリ面に当接させ、そしてこの第４部品２６ｄと第１部品２６ａとの合わせ部をすみ肉溶接することで、第１部品２６ａと第４部品２６ｄとを固着させている。
【００２１】
第５部品２６ｅは、前述のロッド部３４を形成しているネジ棒であり、このネジ棒を第４部品２６ｄの中心のネジ孔に螺合させ、そしてこのネジ棒と第４部品２６ｄとの合わせ部をすみ肉溶接することで、第４部品２６ｄと第５部品２６ｅとを固着させている。
【００２２】
以上の説明から明らかなように、第１部材２６は、径方向外方へ突出したフランジ部４０を有する円筒形の第３部品２６ｃを備えているため、その本体部３２が、軸心ＡＸに対して同心関係にあり第２部材２８側へ突出した円筒部と、この円筒部の先端に形成された径方向外方突出部とを有するものとなっている。
尚、図２ａにおいて、第１部材２６のロッド部３４に螺合及び嵌装したナット４４及び座金４６は、このロッド部３４の先端の第１雄ネジ部２２を、免震積層ゴム１０の下フランジプレート１４の連結用ネジ孔１４ａ（図１）に締結するためのものである。
【００２３】
図２のｂに示すように、第２部材２８は、３個の部品（第１部品２８ａ〜第３部品２８ｃ）を溶接によって一体化して構成したものである。尚、図２のｂは、第２部材２８の上面図と断面側面図とを組み合わせて示した図である。
第１部品２８ａは、軸心ＡＸと同心的に配設される略々円筒形の部品であり、ただし、その円筒形の長さ方向の寸法が小さいため、板状の部品となっている。この第１部品２８ａは、その外周面に平面を４面形成してあり、それら平面にレンチを係合させて回転させることができるようにしてある。既述の如く、この第１部品２８ａは、その中心に、第１部材２６の第３部品２６ｃが挿通される円孔４２が形成されている。円孔４２の内周面は、第１部材２６の第３部品２６ｃの外周面と滑らかに摺接するように表面処理してある。また、第１部品２８ａの上面は、第１部材２６の第３部品２６ｃのフランジ部４０の下面と当接することのある面であり、それらの面が当接して摺接する際にそれらが滑らかに摺接するように、この第１部品２８ａの上面も表面処理してある。
【００２４】
第２部品２８ｂは、軸心ＡＸと同心的に配設される部品であり、鋼管を適当な長さに切断して形成したものである。第１部品２８ａを上述したように第１部材２６ａの本体部３２に組み付けた後に、その第１部品２８ａの上面にこの第２部品２８ｂの下端を当接させ、そして第２部品２８ｂと第１部品２８ａとの合わせ部をすみ肉溶接することで、第１部品２８ａと第２部品２８ｂとを固着させている。
【００２５】
第３部品２８ｃは、軸心ＡＸと同心的に配設される略々円筒形の部品であり、その外周面に平面を４面形成してあり、それら平面にレンチを係合させて回転させることができるようにしてある。前述の第１部材２６の第１部品２６ａと、第２部材２８の第１部品２８ａと、この第２部材２８の第３部品２８ｃとは、軸心ＡＸに垂直に切断した断面の外径形状を同一にしてある。
第３部品２８ｃは、その中心に軸心ＡＸと同心的に左ネジのネジ孔５０が形成されており、予荷重導入治具２０の使用時には、このネジ孔５０に、後述する第３部材３０の第３雄ネジ部５２が螺合される。
第３部品２８ｃの下面を第２部品２８ｂの上端に当接させ、そしてそれら部品の間の合わせ部をすみ肉溶接することで、第２部品２８ｂと第３部品２８ｃとを固着させている。
【００２６】
以上の説明から明らかなように、予荷重導入治具２０の第２部材２８は、中心に円孔４２を形成した板状の第１部品２８ａを備えているため、軸心ＡＸに対して同心関係にある円孔４２が形成された板部を有するものとなっている。そのため予荷重導入治具２０は、図３のａに示すように、第１部材２６の円筒部（第３部品２６ｃ）の径方向突出部（フランジ部４０）が、第２部材２８の板部の円孔４２の縁部に係合することで、第１部材２６と第２部材２８との互いに離隔する方向の変位が規制されるように構成されている。
【００２７】
また、これも以上の説明から明らかなように、予荷重導入治具２０の第２部材２８は、第１部材２６に対して軸心ＡＸを中心として相対回転可能であり、第１部材２６に対して軸心ＡＸに沿って第１位置と第２位置との間で相対移動可能である。ここでいう第１位置とは、第２部材２８の第１部品２８ａの上面が第１部材２６の第３部品２６ｃのフランジ部４０の下面と係合する位置であり、第２位置とは、第２部材２８の第１部品２８ａの下面が第１部材２６の第１部品２６ａの上面と係合する位置である。従って、第２部材２８は、それら第１位置と第２位置とにおいて第１部材２６の本体部３２と係合可能である。
【００２８】
図２のｃに示すように、第３部材３０はネジ棒から成り、このネジ棒の上部は右ネジの雄ネジ部として形成され、下部は左ネジの雄ネジ部として形成されている。上部の右ネジの雄ネジ部は、免震積層ゴム１０の上フランジプレート１２に連結される前述の第２雄ネジ部２４であり、下部の左ネジの雄ネジ部は、第２部材２８のネジ孔５０に螺合される前述の第３雄ネジ部５２である。第３部材３０には、その下部の雄ネジ部の最奥部にナット５４を螺合させてスポット溶接で固着してあり、このナット５４にスパナ等を係合させて、第３部材３０を回転させることができるようにしてある。第３部材３０は、この第３部材３０を免震積層ゴム１０の上フランジプレート１２に締結するためのナット５６及び座金５８と、第２部材２８に締結するためのナット６０及び座金６２とを備えている。
【００２９】
従って、第３部材３０は、軸心ＡＸに沿って延在するロッド部（ネジ棒）を含んでおり、このロッド部の第１端に第２雄ネジ部２４が形成されており、このロッド部の第２端に、第２部材２８のネジ孔５０と螺合する第３雄ネジ部５２を有するものとなっている。
また、この第３部材３０のロッド部（ネジ棒）の両端の、第２雄ネジ部２４と第３雄ネジ部５２との一方を右ネジとして形成し、他方を左ネジとして形成することで、免震積層ゴム１０から予荷重導入治具２０を取り外す際の作業を容易にしている。
更に、以上の説明から明らかなように、第３部材３０の第３雄ネジ部５２と、第２部材２８のネジ孔５０との螺合量を調節することで、予荷重導入治具２０の第１雄ネジ部２２と第２雄ネジ部２４との間の長さを調節することができるようにしている。
【００３０】
次に、以上に説明した予荷重導入治具２０を使用して行う、本発明の実施の形態にかかる積層ゴム型免震装置への予荷重導入方法の具体的な手順について説明して行く。
予荷重を導入する免震積層ゴム１０には、既に述べたように、その上下のフランジプレート１２、１４に、予荷重導入治具２０を螺合連結するための連結用ネジ孔１２ａ、１４ａを形成しておく。
また、必要個数の複数の予荷重導入治具２０を用意し、それら予荷重導入治具２０は、免震積層ゴム１０の上下のフランジプレート１２、１４の間に架設できるように、その第３部材３０の第３雄ネジ部５２を、第２部材２８の内部に十分深くまで螺入させておく。
【００３１】
更に、油圧プレス機等の加圧装置を用意する。この加圧装置に、免震積層ゴム１０を装填する。そして、この加圧装置で免震積層ゴム１０の上フランジプレート１２と下フランジプレート１４とを挟圧し所望の圧縮荷重を加えて免震積層ゴム１０の積層ゴム体１６を圧縮することにより、上フランジプレート１２と下フランジプレート１４との間の間隔を短縮する。
ここでいう所望の圧縮荷重とは、免震積層ゴム１０に導入しようとする予荷重の大きさと略々等しく、ただしそれよりも僅かに大きい荷重である。ここで加圧器による圧縮荷重を予荷重より僅かに大きくする理由は、後述するように加圧装置を除荷する際に、予荷重導入治具２０に作用している引張力が増大し、予荷重導入治具２０が弾性伸張することにより、上下のフランジプレート１２、１４の間隔がごく僅かに広がり、免震積層ゴム１０に加わっていた圧縮荷重が僅かながら減少するため、その減少分を見込んで大きめに設定しているのである。
【００３２】
続いて、各々の予荷重導入治具２０の第１雄ネジ部２２を上下のフランジプレート１２、１４の連結用ネジ孔１２ａ、１４ａの一方に螺合させ、第２雄ネジ部２４を他方に螺合させることで、上下のフランジプレート１２、１４の間に複数の予荷重導入治具２０を架設する。
更に、レンチやスパナ等を使用して、第１部材２６、第２部材２８、及び第３部材を適宜回転させることで、上下のフランジプレート１２、１４の間に架設した予荷重導入治具２０の長さを調節し、予荷重導入治具２０に引張荷重が加わるようにする。これによって、第１部材２６の第３部品３６ｃのフランジ部４０の下面と、第２部材２８の第１部品２８ａの上面とが、図３のａに示すように当接した状態になり、上フランジプレート１２と下フランジプレート１４との互いに離隔する方向への相対変位を拘束するようになる。
【００３３】
続いて、予荷重導入治具２０に装備した３個のナット４４、５６、６０を締め付けることで、第２部材２８と第３部材３０とを強固に締結すると共に、予荷重導入治具２０と上下のフランジプレート１２、１４とを強固に締結する。
続いて、加圧装置を除荷すると、この加圧装置に代わって、架設した複数の予荷重導入治具２０が、免震積層ゴム１０に導入された予荷重を保持するようになる。
以上によって予荷重の導入が完了する。こうして予荷重を導入した免震積層ゴム１０を現場へ搬送して建物に設置する。なお、施工条件および環境温度などによっては、油圧プレス機械などを用いず、作業所にて直接締め付ける場合もある。
【００３４】
全ての免震積層ゴム１０を、その建物に設置完了したならば、各々の免震積層ゴム１０から予荷重導入治具２０を取り外す。ただし、予荷重導入治具２０を取り外す時点では既に、免震積層ゴム１０を実際の建物荷重が加わっており、しかも、既述の如く、予め計算によって求めた予荷重の大きさと、免震積層ゴム１０に実際に加わる建物荷重の大きさとの間には誤差が存在するため、実際の建物荷重が予荷重の大きさを超えている場合がしばしばある。
そのような場合でも、予荷重導入治具２０は、免震積層ゴム１０の上下のフランジプレート１２、１４の互いに接近する方向への相対変位を許容可能に構成されているため、予荷重導入治具２０には何ら圧縮荷重が加わることなく、それらフランジプレート１２、１４の間の間隔は何ら支障なく短縮することができる。即ち、そのような場合には、図３のｂに示すように、第１部材２６の第３部品３６ｃのフランジ部４０の下面と、第２部材２８の第１部品２８ａの上面とが離隔するため、予荷重導入治具２０には圧縮荷重が作用せず、従って、従来の予荷重導入治具を使用したときのようにガス切断しなければ免震積層ゴムから予荷重導入治具を取り外せないという事態に至ることがない。
なお、予荷重導入治具２０の用途は実施の形態のような積層ゴム型免震装置のみに限定されず、例えば、防振ゴムやコイルばねなどの弾性体への予荷重導入の際に適用可能である。
【００３５】
【発明の効果】
以上の説明から明らかなように、本発明にかかる積層ゴム型免震装置への予荷重導入治具及び予荷重導入方法ならびに予荷重導入治具によれば、積層ゴム型免震装置に予荷重を導入するために使用する予荷重導入治具が、前記上フランジプレートと前記下フランジプレートとの一方に形成されたネジ孔と他方に形成されたネジ孔とに夫々螺合される第１雄ネジ部と第２雄ネジ部とを有し、前記第１雄ネジ部と前記第２雄ネジ部とを夫々に対応する前記フランジプレートの前記ネジ孔に螺合することで、前記上フランジプレートと前記下フランジプレートとの間に架設可能であり、前記第１雄ネジ部と前記第２雄ネジ部との間の長さが調節可能であり、前記上フランジプレートと前記下フランジプレートとの間に架設された状態において、それらフランジプレートの互いに離隔する方向への相対変位を拘束可能で、しかもそれらフランジプレートの互いに接近する方向への相対変位を許容可能に構成され、互いに同一軸心上に位置する第１部材と、第２部材と、第３部材とを含んでおり、前記第１部材は、前記軸心に沿って延在しその端部に前記第１雄ネジ部が形成されており、前記第２部材は、前記第１部材に対して前記軸心を中心として相対回転可能であり、前記第１部材に対して前記軸心に沿って第１位置と第２位置との間で相対移動可能であり、前記第１位置と前記第２位置とにおいて前記第１部材と係合可能であり、前記第３部材は、前記軸心に沿って延在しその端部に前記第２雄ネジ部が形成されており、前記第２部材と前記軸心方向において螺合し、前記第３部材と前記第２部材との螺合量を調節することで、前記第１雄ネジ部と前記第２雄ネジ部との間の長さを調節可能にし、前記上フランジプレートと前記下フランジプレートの互いに離隔する方向への相対変位の拘束は、前記第２部材が前記第１位置で前記第１部材に係合することで前記第１部材と前記第２部材との互いに離隔する方向の変位が規制されることによってなされ、前記上フランジプレートと前記下フランジプレートの互いに接近する方向への相対変位の許容は、前記第２部材が前記第１位置と前記第２位置との間で前記第１部材と前記第２部材との互いに接近する方向の変位が許容されることによってなされる。
そのため、上フランジプレートと下フランジプレートとの間に複数の予荷重導入治具を架設することで予荷重を導入した積層ゴム型免震装置を建物に設置した後に、導入した予荷重を超える大きさの建物荷重がその積層ゴム型免震装置に加わるようになった場合でも、予荷重導入治具をガスバーナー等によって切断することを必要とせず、手作業により容易に積層ゴム型免震装置から予荷重導入治具を取り外すことができ、従って、予荷重導入治具のガス切断等による建物へのひび割れ発生等の悪影響を回避することができる。
また、本発明に使用する予荷重導入治具は、積層ゴム型免震装置から取り外す際に切断する必要がないため常に再使用可能であり、従って、ガス切断作業等の手間とコストを省けるばかりでなく、予荷重導入治具の再使用によるコスト低減効果も得られる。
【図面の簡単な説明】
【図１】本発明の実施の形態にかかる予荷重導入治具を上フランジプレートと下フランジプレートとの間に架設した積層ゴム型免震装置の側面図である。
【図２】ａ、ｂ、及びｃは、図１の予荷重導入治具を構成する部材を個別に示した図である。
【図３】ａ及びｂは、積層ゴム型免震装置の上フランジプレートと下フランジプレートとの間隔が狭まったときの予荷重導入治具の作用を説明するための、図１の予荷重導入治具の要部断面図である。
【符号の説明】
１０ 積層ゴム型免震装置（免震積層ゴム）
１２ 上フランジプレート
１４ 下フランジプレート
１６ 積層ゴム体
２０ 予荷重導入治具
２２ 第１雄ネジ部
２４ 第２雄ネジ部
２６ 第１部材
２８ 第２部材
３０ 第３部材
５２ 第３雄ネジ部
ＡＸ 軸心[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a preload introduction jig and a preload introduction method for a laminated rubber type seismic isolation device or the like.
[0002]
[Prior art]
As a structure to protect the building from vibrations such as earthquakes, the building is divided into an upper structure and a lower structure, and the parts are connected by a plurality of laminated rubber-type seismic isolation devices, and the weight of the upper structure is determined by the laminated rubber. The seismic isolation structure is supported by the lower structure via the seismic isolation device, and absorbs and reduces the horizontal vibration force caused by earthquakes transmitted from the lower structure to the upper structure. Is widely adopted.
The substructure of the building is, for example, the foundation of the building fixed to the ground. In this case, the superstructure of the building is the main body portion of the building supported by the foundation.
The laminated rubber type seismic isolation device is provided between an upper flange plate and a lower flange plate respectively connected to an upper structure and a lower structure of a building, and is provided between the upper flange plate and the lower flange plate to support a vertical load. It is composed of a laminated rubber body that can be shear-deformed in the horizontal direction, and such a laminated rubber type seismic isolation device is sometimes referred to simply as “seismic isolation laminated rubber” or “laminated rubber bearing”. There is also. In the following description of the prior art, this will be referred to as seismic isolation laminated rubber.
[0003]
Seismic isolation laminated rubber has great rigidity against vertical loads. However, since the vertical load actually applied to the seismic isolation laminated rubber is generally extremely large, the vertical compression amount (also referred to as the sinking amount) of the seismic isolation laminated rubber generated by the vertical load is never small. In many cases, the amount of subsidence is a size corresponding to about 10 to 30% of the unloaded height dimension of the laminated rubber body constituting the seismic isolation laminated rubber.
[0004]
Recently, in addition to incorporating seismic isolation laminated rubber when building a new building, construction to install seismic isolation laminated rubber into an existing building and make it seismic isolation has been widely performed. As described above, the installation (installation) of the seismic isolation laminated rubber into the existing building for the seismic retrofit of the existing building is called seismic isolation retrofit.
If seismic isolation laminated rubber is incorporated without load when performing seismic isolation retrofit, the sinking that occurs in individual seismic isolation laminated rubber when installation work is completed and building load is borne by the seismic isolation rubber There is a risk that the building will be tilted or cracked due to the difference.
Therefore, when performing seismic isolation retrofit, calculate the approximate building load that each seismic isolation rubber will bear after the installation of the seismic isolation rubber is completed, and calculate the percentage of each calculated load. The base-isolated laminated rubber that is loaded between the upper and lower flange plates of the individual base-isolated laminated rubber and compressed and deformed in the vertical direction is incorporated into the building. Making a desired load on the seismic isolation laminated rubber in this way is called preload introduction into the seismic isolation laminated rubber.
[0005]
In order to introduce a preload to the seismic isolation laminated rubber, in general, a plurality of preload introduction jigs are installed between the upper and lower flange plates of the seismic isolation laminated rubber. As a preload introduction jig, there is one composed of one turn buckle and two screw rods. The preload introduction of the seismic isolation laminated rubber using this conventional preload introduction jig has been performed as follows.
First, the upper flange plate of the seismic isolation laminated rubber is formed with screw holes for screwing one screw rod of the preload introduction jig at a plurality of positions at equal intervals along the outer periphery. The lower flange plate is formed with screw holes for screwing the other screw rod of the preload introduction jig at locations corresponding to the plurality of screw holes of the upper flange plate. For example, when two preload introduction jigs are used for one seismic isolation laminated rubber, the number of screw holes formed in the upper and lower flange plates is set to two, and four preload introduction jigs are used. In this case, the number of screw holes is also set to four.
[0006]
Next, a pressurizing device such as a hydraulic press machine is prepared, and the seismic isolation laminated rubber is loaded into the pressurizing device. And the space | interval between these flange plates is shortened by pressing the upper flange plate and the lower flange plate with the pressurizing device and applying a desired compressive load to compress the laminated rubber body of the seismic isolation laminated rubber.
Further, with the seismic isolation laminated rubber held in this state, a plurality of sets of preload introduction jigs are installed between the upper and lower flange plates, and the turnbuckles of the preload introduction jigs are tightened to attach the upper and lower flange plates. The relative displacement of is restricted.
Subsequently, when the pressure device is unloaded, instead of this pressure device, a plurality of preload introduction jigs installed hold the preload introduced into the seismic isolation laminated rubber. Introduction of preload is completed.
[0007]
When all the seismic isolation rubbers are installed in the building, the preload introduction jig is removed from each seismic isolation rubber after making the entire building load borne by the seismic isolation rubbers. However, at this time, there is an error between the building load actually applied to each seismic isolation laminated rubber and the respective preloads calculated in advance. It is not uncommon for the calculated load (that is, the preload introduced into the base isolation laminated rubber) to be smaller and the actual load to be greater than the calculated load with another base isolation laminated rubber.
In some cases, the actual load may be considerably larger than the calculated load. If this happens, a large axial compression force is applied to the preload introduction jig, and the turnbuckle is rotated to remove the preload introduction jig. It becomes impossible. This often occurs. Conventionally, in such a case, one screw rod of the preload introduction jig is gas-cut to remove the compressive force in the axial direction, and then the preload introduction jig is removed. I was doing.
[0008]
[Problems to be solved by the invention]
However, the fact that the gas cutting work is necessary to remove the preload introduction jig from the seismic isolation laminated rubber increases the labor for installing the seismic isolation laminated rubber and increases the cost.
In addition, if the preload introduction jig installed on the seismic isolation laminated rubber is gas-cut, when the cutting is completed, the building load that was previously borne by the preload introduction jig will suddenly increase. Since it is added to the rubber laminated rubber body, the amount of subsidence of the seismic isolation laminated rubber increases rapidly. As a result, the existing building may be deformed excessively and may be cracked.
The present invention has been made in view of the above circumstances, and an object of the present invention is a laminated rubber in which a preload is introduced by installing a plurality of preload introduction jigs between an upper flange plate and a lower flange plate. Even after building-type seismic isolation devices are installed in a building, the preload introduction jig is cut by gas cutting, etc., even if a building load that exceeds the installed preload is applied to the laminated rubber-type seismic isolation device The preload introduction jig can be easily removed from the laminated rubber-type seismic isolation device by hand without any need to do so. Therefore, there is an adverse effect such as the occurrence of cracks in the building due to gas cutting of the preload introduction jig. It is an object of the present invention to provide a preload introduction jig and a preload introduction method for a building that can avoid the above-described problem.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, a preload introduction jig to a laminated rubber type seismic isolation device according to the present invention includes an upper flange plate and a lower flange plate respectively connected to an upper structure and a lower structure of a building; Preload introduction for introducing a preload into a laminated rubber type seismic isolation device provided with a laminated rubber body that is provided between the flange plate and the lower flange plate and supports a vertical load and is capable of shear deformation in the horizontal direction. In the jig, a first male screw portion and a second male screw portion that are respectively screwed into a screw hole formed in one of the upper flange plate and the lower flange plate and a screw hole formed in the other. And screwing the first male screw part and the second male screw part into the corresponding screw holes of the flange plate, respectively, between the upper flange plate and the lower flange plate. And the length between the first male screw part and the second male screw part is adjustable, and in the state of being laid between the upper flange plate and the lower flange plate, The relative displacement of the flange plates in the direction away from each other can be restricted, and the relative displacement of the flange plates in the direction of approaching each other can be allowed.The first member, the second member, and the third member are located on the same axis, and the first member extends along the axis and has the first member at the end thereof. A male screw portion is formed, and the second member is rotatable relative to the first member about the axis, and a first position along the axis with respect to the first member. Between the first position and the second position, engageable with the first member at the first position and the second position, and the third member extends along the axis. The second male threaded portion is formed at the end, and the second member is threadedly engaged with the second member in the axial direction, and the amount of threading between the third member and the second member is adjusted. The length between the first male screw part and the second male screw part can be adjusted, and the upper flange plate and the lower flange plate can be adjusted. The relative displacement of the first member and the second member in the direction away from each other is restricted by the second member engaging the first member at the first position. The upper flange plate and the lower flange plate are allowed to move relative to each other in the direction in which the upper flange plate and the lower flange plate approach each other. The second member is moved between the first position and the second position. This is done by allowing the displacement of the one member and the second member in the approaching direction.It is characterized by that.
  In the preload introducing jig to the laminated rubber type seismic isolation device according to the present invention, the first member includes a main body portion and a rod portion fixed to the main body portion and extending along the axis. HaveThe one male screw part is formed at the tip of the rod part,The second member is,A screw hole having a concentric relationship with the axis, wherein the third member includes a rod portion extending along the axis;The second male screw portion is formed at the first end of the rod portion, and a third male screw portion that is screwed into the screw hole of the second member is formed at the second end of the rod portion, The third member and the second member are screwed together by the third male screw portion of the third member screwing into the screw hole of the second member.It is characterized by that.
  The preload introduction jig to the laminated rubber type seismic isolation device according to the present invention is a cylinder in which the main body portion of the first member is concentric with the axis and extends toward the second member side. And a radially outward projecting portion formed at the tip of the cylindrical portion, and the second member has a plate portion in which a circular hole concentric with the axis is formed. The cylindrical portion of the first member is inserted through the circular hole of the second member,The first position of the second member is formed by engagement of the radially outward projecting portion of the first member with an edge of the circular hole of the plate portion of the second member, and the second position. The second position of the member is formed by the main body portion of the first member engaging the plate portion of the second member.It is characterized by that.
  Moreover, the preload introducing jig to the laminated rubber type seismic isolation device according to the present invention is one of the second male screw part and the third male screw part formed at both ends of the rod part of the third member. Is formed as a right-hand thread, and the other is formed as a left-hand thread.
  In addition, the preload introduction method to the laminated rubber type seismic isolation device according to the present invention includes an upper flange plate and a lower flange plate respectively connected to an upper structure and a lower structure of a building, the upper flange plate, and the lower flange plate. In the preload introduction method for introducing a preload to a laminated rubber type seismic isolation device provided with a laminated rubber body that is provided between and supporting a vertical load and is capable of shear deformation in the horizontal direction, the preload introduction jig A plurality of pressure devices, a pressure device is prepared, the laminated rubber type seismic isolation device is loaded into the pressure device, and the upper flange plate and the lower flange plate of the laminated rubber type seismic isolation device by the pressure device. And compressing the laminated rubber body by applying a desired compressive load to shorten the distance between the upper flange plate and the lower flange plate, and The plurality of preload introduction jigs are installed between the upper flange plate and the lower flange plate, and the lengths of the plurality of preload introduction jigs installed between the upper flange plate and the lower flange plate are set. By adjusting, the relative displacement of the upper flange plate and the lower flange plate in a direction away from each other is restrained.
  The preload introduction jig according to the present invention includes a first member, a second member, and a third member that are located on the same axis, and the first member includes a main body portion, A rod portion fixed to the main body portion and extending along the axis, and a first male screw portion is formed at a tip of the rod portion of the first member, and the second member is The first member is rotatable relative to the axis about the axis, the first member is movable relative to the first member between a first position and a second position along the axis; The first member has a screw hole that is engageable with the body portion of the first member at the first position and the second position, and has a concentric relationship with the shaft center, and the third member has the shaft center. And a second male screw portion is formed at a first end of the rod portion, and a second end of the rod portion is formed. A third male screw portion screwed into the screw hole of the second member; and adjusting an amount of screwing between the third male screw portion of the third member and the screw hole of the second member. And adjusting the length between the first male screw portion and the second male screw portion.The relative displacement of the first male screw portion and the second male screw portion in a direction away from each other can be restrained, and the first male screw portion and the second male screw portion in a direction approaching each other. It is configured to allow relative displacement, and the relative displacement in the direction in which the first male screw portion and the second male screw portion are separated from each other is restricted by the second member being placed on the first member at the first position. By engaging, displacement of the first member and the second member in a direction away from each other is regulated, and the first male screw portion and the second male screw portion are moved toward each other. The relative displacement is allowed by allowing the second member to be displaced in the direction in which the first member and the second member approach each other between the first position and the second position.It is characterized by that.
  The preload introduction jig according to the present invention includes a cylindrical portion in which the main body portion of the first member is concentric with the axis and extends toward the second member, and a tip of the cylindrical portion. And the second member has a plate portion formed with a circular hole concentrically with respect to the axis, and the cylinder of the first member. A portion is inserted through the circular hole of the second member,The first position of the second member is formed by engagement of the radially outward projecting portion of the first member with an edge of the circular hole of the plate portion of the second member, and the second position. The second position of the member is formed by the main body portion of the first member engaging the plate portion of the second member.It is characterized by that.
  In the preload introduction jig according to the present invention, one of the second male screw portion and the third male screw portion formed at both ends of the rod portion of the third member is formed as a right screw, and the other Is formed as a left-hand thread.
[0010]
According to the preload introduction jig, the preload introduction method, and the preload introduction jig to the laminated rubber type seismic isolation device according to the present invention, a plurality of preload introduction jigs are provided between the upper flange plate and the lower flange plate. Even if a laminated rubber-type seismic isolation device with a preload is installed in a building and a building load with a size exceeding the introduced preload is applied to the laminated rubber-type seismic isolation device The distance between the upper and lower flange plates can be shortened without any trouble, and at that time, a compressive load does not act from the flange plates to the preload introduction jig. Therefore, even in such a case, it is not necessary to cut the preload introduction jig by gas cutting or the like, and the preload introduction jig can be easily detached from the laminated rubber-type seismic isolation device manually. Accordingly, since the preload introduction jig has to be gas-cut like a preload introduction jig using a conventional turnbuckle, there is no adverse effect such as cracking on the building.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a side view of a laminated rubber type seismic isolation device in which a preload introduction jig according to an embodiment of the present invention is installed between an upper flange plate and a lower flange plate, and a, b, and c in FIG. FIG. 3 is a diagram showing individual members constituting the preload introduction jig of FIG. 1, and FIGS. 3A and 3B are views when the interval between the upper flange plate and the lower flange plate of the laminated rubber type seismic isolation device is narrowed. It is principal part sectional drawing of the preload introduction jig | tool of FIG. 1 for demonstrating the effect | action of a preload introduction jig | tool.
[0012]
A laminated rubber type seismic isolation device 10 (hereinafter referred to as “seismic isolation laminated rubber”) shown in FIG. 1 is disposed between an upper structure and a lower structure of a building and supports the weight of the upper structure, It functions to absorb and reduce horizontal vibration forces caused by earthquakes transmitted from the structure to the superstructure.
Although the building is not shown in the figure, the lower structure of the building is, for example, the foundation of the building fixed to the ground, and the upper structure in that case is the structure of the building supported by the foundation. It is a body part. However, as is well known, this type of seismic isolation laminated rubber is sometimes divided into a portion of the building that is considerably above the foundation and disposed in the divided portion.
In any case, the upper structure and the lower structure of the building are connected by a plurality of seismic isolation laminated rubbers 10, and the weight of the upper structure is supported by the lower structures via the seismic isolation laminated rubbers 10. The seismic isolation structure can be configured by absorbing and reducing the horizontal vibration force caused by the earthquake transmitted from the lower structure to the upper structure by the seismic isolation laminated rubber 10.
[0013]
The seismic isolation laminated rubber 10 includes an upper flange plate 12 connected to the upper structure of the building, a lower flange plate 14 connected to the lower structure of the building, and a laminated rubber provided between the flange plates 12 and 14. And a body 16.
The laminated rubber body 16 forms a cylindrical body by alternately laminating a plurality of disc-shaped rubber plate layers and a plurality of steel plate layers extending in the horizontal direction in the vertical direction, and the side surface of the cylindrical body is covered with rubber. It is of a known structure covered with layers and has a high vertical rigidity for supporting a vertical load, and is capable of shear deformation in the horizontal direction, and the upper flange plate 12 and the lower flange by the horizontal shear deformation. A horizontal displacement relative to the plate 14 is allowed.
[0014]
As described above, the seismic isolation laminated rubber 10 has a large rigidity with respect to the vertical load. However, since the vertical load actually applied to the seismic isolation laminated rubber 10 is generally extremely large, the seismic isolation laminate generated by the vertical load is used. The compression amount (sink amount) of the rubber 10 in the vertical direction is not small. Therefore, a preload is introduced into the seismic isolation laminated rubber 10 mainly for the purpose of preventing the occurrence of inconvenience due to the sinking amount during the seismic isolation retrofit. In the present invention, in order to introduce the preload, a plurality of preload introduction jigs 20 are installed between the upper flange plate 12 and the lower flange plate 14 of the seismic isolation laminated rubber 10.
[0015]
In order to construct the preload introduction jig 20, the preload introduction jig 20 is screwed and connected to the upper flange plate 12 of the seismic isolation laminated rubber 10 at a plurality of positions at equal angular intervals along the outer periphery thereof. Screw holes 12a are formed. The lower flange plate 14 is also formed with screw holes 14a for screwing and connecting the preload introduction jig 20 at positions immediately below the plurality of screw holes 12a of the upper flange plate 12, respectively. .
The number of connecting screw holes 12a and 14a is the number of preload introduction jigs 20 installed on the seismic isolation laminated rubber 10 (this is the size of the preload introduced into the seismic isolation laminated rubber 10 and one preloading jig). For example, if two preload introduction jigs 20 are used for one seismic isolation laminated rubber 10, the connecting screw holes 12 a are determined in accordance with the maximum tensile load of the load introduction jig 20. , 14a are formed at intervals of 180 [deg.], And if four preload introduction jigs 20 are used, four are formed at intervals of 90 [deg.].
[0016]
The preload introduction jig 20 has a rod shape as a whole, and has a first male screw portion 22 and a second male screw portion 24 at both ends thereof. The first male screw portion 22 is screwed into one of the connecting screw hole 12a of the upper flange plate 12 and the connecting screw hole 14a of the lower flange plate 14, and the second male screw portion 24 is screwed into the other. The preload introduction jig 20 can be installed between the upper flange plate 12 and the lower flange plate 14.
The preload introduction jig 20 is configured such that the length between the first male screw portion 22 and the second male screw portion 24 can be adjusted, as will be described later.
Further, the preload introduction jig 20 can restrain the relative displacement of the flange plates 12 and 14 in a direction away from each other in a state where the preload introduction jig 20 is installed between the upper and lower flange plates 12 and 14. 12 and 14 are configured to allow relative displacement in a direction in which they approach each other.
[0017]
In the illustrated embodiment, these functions of the preload introduction jig 20 are obtained by a specific configuration described below.
First, the preload introduction jig 20 includes a first member 26, a second member 28, and a third member 30 that are located on the same axis AX. The preload introduction jig 20 shown in FIG. 1 shows a state in which these three members 26, 28, and 30 are assembled to each other, and a, b, and c in FIG. , 28 and 30 are individually shown. However, as will be apparent from the following description, the first member 26 and the second member 28 are not separated from each other after the preload introduction jig 20 is once assembled.
[0018]
As shown to a of FIG. 2, the 1st member 26 has the main-body part 32 and the rod part 34 fixed to this main-body part 32, and extended along the axial center AX, This 1st member 26 is shown. The above-described first male screw portion 22 is formed at the tip of the rod portion 34.
The first member 26 is configured by assembling five parts (first part 26a to fifth part 26e) by welding or the like. 2a is a view showing a combination of a top view and a sectional side view.
The first part 26a is a part having a substantially cylindrical diameter disposed concentrically with the shaft center AX. Four flat surfaces are formed on the outer peripheral surface of the first part 26a. I can do it. Further, the first component 26a is formed with a through hole concentric with the axis AX, and the upper end portion and the lower end portion of the through hole have a large diameter portion by counterbore. The first part 26a is further formed with a shallow counterbore surface on the lower surface thereof, with which the upper surface of the fourth part 26d abuts.
The second component 26b is a hexagon socket head cap screw, and the shaft portion of the hexagon socket head bolt is inserted into the through hole of the first component 26a from below.
[0019]
The third part 26c is a substantially cylindrical part disposed concentrically with the shaft center AX, and has a flange portion 40 projecting radially outward at the upper end thereof, and the shaft center at the center thereof. A screw hole is formed concentrically with AX.
The third part 26c is inserted into a circular hole of the first part 28a of the second member 28, which will be described later, and then inserted into the center hole of the first part 26a from above, so that a hexagon socket bolt (second part) 26b. Is screwed into the screw hole of the third part 26c, and the upper end of the hexagon socket head bolt 26b and the upper end of the screw hole of the third part 26c are welded. As a result, the first component 26a, the second component 26b, and the third component 26c are assembled.
The outer peripheral surface of the third component 26c is surface-treated so as to be in smooth sliding contact with the inner peripheral surface of the circular hole 42 of the first component 28a of the second member 28. Further, the lower surface of the flange portion 40 at the upper end of the third component 26c is a surface that may come into contact with the upper surface of the first component 28a of the second member 28, as will be described later. The bottom surface of the flange portion 40 is also subjected to a surface treatment so that they are in sliding contact with each other when contacting.
[0020]
The fourth part 26d is a substantially cylindrical part disposed concentrically with the axis AX, and a screw hole is formed concentrically with the axis AX at the center thereof. The upper end surface of the fourth component 26d is brought into contact with the above-described shallow counterbore surface of the lower surface of the first component 26a, and the mating portion of the fourth component 26d and the first component 26a is fillet welded, whereby The one component 26a and the fourth component 26d are fixed.
[0021]
The fifth part 26e is a screw rod forming the rod portion 34 described above, and this screw rod is screwed into the screw hole at the center of the fourth component 26d, and the screw rod and the fourth component 26d are connected to each other. The fourth part 26d and the fifth part 26e are fixed by performing fillet welding of the mating portion.
[0022]
As is clear from the above description, the first member 26 includes the cylindrical third part 26c having the flange portion 40 protruding outward in the radial direction. It has a cylindrical portion that is concentric with the cylindrical member and protrudes toward the second member 28, and a radially outward protruding portion that is formed at the tip of the cylindrical portion.
2a, the nut 44 and the washer 46 screwed and fitted to the rod portion 34 of the first member 26 are connected to the first male screw portion 22 at the tip of the rod portion 34 under the seismic isolation laminated rubber 10. This is for fastening to the connecting screw hole 14a (FIG. 1) of the flange plate 14.
[0023]
As shown in FIG. 2b, the second member 28 is formed by integrating three parts (first part 28a to third part 28c) by welding. FIG. 2B is a view showing a combination of a top view and a cross-sectional side view of the second member 28.
The first part 28a is a substantially cylindrical part arranged concentrically with the axis AX, but is a plate-like part because the cylindrical dimension in the length direction is small. The first component 28a has four planes formed on the outer peripheral surface thereof, and can be rotated by engaging a wrench with these planes. As described above, the first part 28a has a circular hole 42 through which the third part 26c of the first member 26 is inserted. The inner peripheral surface of the circular hole 42 is surface-treated so as to be in smooth sliding contact with the outer peripheral surface of the third component 26c of the first member 26. Further, the upper surface of the first component 28a is a surface that may come into contact with the lower surface of the flange portion 40 of the third component 26c of the first member 26. The upper surface of the first component 28a is also surface-treated so as to be in sliding contact.
[0024]
The second part 28b is a part disposed concentrically with the axis AX, and is formed by cutting a steel pipe into an appropriate length. After the first part 28a is assembled to the main body 32 of the first member 26a as described above, the lower end of the second part 28b is brought into contact with the upper surface of the first part 28a, and the second part 28b and the first part The first part 28a and the second part 28b are fixed by performing fillet welding on the mating portion with the part 28a.
[0025]
The third part 28c is a substantially cylindrical part arranged concentrically with the axis AX, and has four planes formed on the outer peripheral surface thereof, and is rotated by engaging a wrench with these planes. I can do it. The first part 26a of the first member 26, the first part 28a of the second member 28, and the third part 28c of the second member 28 are outer diameter shapes of cross sections cut perpendicularly to the axis AX. Are the same.
The third component 28c has a left-hand threaded screw hole 50 concentrically with the axis AX at the center thereof. When the preload introduction jig 20 is used, the third part 30c is inserted into the third member 30 described later. The third male screw portion 52 is screwed.
The lower surface of the third part 28c is brought into contact with the upper end of the second part 28b, and the joint between the parts is fillet welded to fix the second part 28b and the third part 28c.
[0026]
As is clear from the above description, the second member 28 of the preload introduction jig 20 includes the plate-like first component 28a having a circular hole 42 formed at the center, and therefore is concentric with the axis AX. It has the board part in which the circular hole 42 in relation was formed. Therefore, as shown in FIG. 3 a, the preload introduction jig 20 is configured such that the radially protruding portion (flange portion 40) of the cylindrical portion (third component 26 c) of the first member 26 is the plate portion of the second member 28. By engaging with the edge of the circular hole 42, the displacement of the first member 26 and the second member 28 in the direction away from each other is regulated.
[0027]
Further, as is clear from the above description, the second member 28 of the preload introduction jig 20 can be rotated relative to the first member 26 about the axis AX. On the other hand, relative movement is possible between the first position and the second position along the axis AX. The first position here is a position where the upper surface of the first component 28a of the second member 28 is engaged with the lower surface of the flange portion 40 of the third component 26c of the first member 26, and the second position is This is a position where the lower surface of the first component 28 a of the second member 28 is engaged with the upper surface of the first component 26 a of the first member 26. Accordingly, the second member 28 can be engaged with the main body portion 32 of the first member 26 at the first position and the second position.
[0028]
As shown in FIG. 2c, the third member 30 is formed of a screw rod, and the upper portion of the screw rod is formed as a male screw portion of a right screw, and the lower portion is formed of a male screw portion of a left screw. The male screw portion of the upper right screw is the above-described second male screw portion 24 connected to the upper flange plate 12 of the seismic isolation laminated rubber 10, and the male screw portion of the lower left screw is the second screw 28 of the second member 28. The third male screw portion 52 is screwed into the screw hole 50. A nut 54 is screwed onto the innermost part of the lower male threaded portion of the third member 30 and fixed by spot welding, and a spanner or the like is engaged with the nut 54 to attach the third member 30 to the third member 30. It can be rotated. The third member 30 includes a nut 56 and a washer 58 for fastening the third member 30 to the upper flange plate 12 of the seismic isolation laminated rubber 10, and a nut 60 and a washer 62 for fastening the third member 30 to the second member 28. I have.
[0029]
Accordingly, the third member 30 includes a rod portion (threaded rod) extending along the axis AX, and a second male threaded portion 24 is formed at the first end of the rod portion. A third male screw portion 52 that is screwed into the screw hole 50 of the second member 28 is provided at the second end of the portion.
Further, by forming one of the second male screw portion 24 and the third male screw portion 52 at both ends of the rod portion (screw rod) of the third member 30 as a right screw and the other as a left screw. The work when removing the preload introduction jig 20 from the seismic isolation laminated rubber 10 is facilitated.
Further, as is clear from the above description, by adjusting the screwing amount between the third male screw portion 52 of the third member 30 and the screw hole 50 of the second member 28, the preload introducing jig 20 can be adjusted. The length between the first male screw portion 22 and the second male screw portion 24 can be adjusted.
[0030]
Next, a specific procedure of the preload introduction method to the laminated rubber type seismic isolation device according to the embodiment of the present invention performed using the preload introduction jig 20 described above will be described.
As described above, the seismic isolation laminated rubber 10 for introducing the preload has connection screw holes 12a and 14a for screwing and connecting the preload introduction jig 20 to the upper and lower flange plates 12 and 14, respectively. Form it.
Also, a plurality of preload introduction jigs 20 of a necessary number are prepared, and the third preload introduction jigs 20 are constructed so that they can be installed between the upper and lower flange plates 12 and 14 of the seismic isolation laminated rubber 10. The third male screw portion 52 of the member 30 is screwed into the second member 28 sufficiently deeply.
[0031]
Further, a pressurizing device such as a hydraulic press machine is prepared. The seismic isolation laminated rubber 10 is loaded into this pressurizing device. And by pressing the upper flange plate 12 and the lower flange plate 14 of the seismic isolation laminated rubber 10 with this pressurizing device and applying a desired compressive load, the laminated rubber body 16 of the seismic isolation laminated rubber 10 is compressed. The interval between the flange plate 12 and the lower flange plate 14 is shortened.
The desired compressive load here is a load that is substantially equal to the magnitude of the preload to be introduced into the seismic isolation laminated rubber 10, but is slightly larger than that. Here, the reason why the compressive load by the pressurizer is slightly larger than the preload is that, as will be described later, when the pressurizer is unloaded, the tensile force acting on the preload introduction jig 20 increases, and the preload is increased. Since the load introducing jig 20 is elastically stretched, the distance between the upper and lower flange plates 12 and 14 is slightly increased, and the compressive load applied to the seismic isolation laminated rubber 10 is slightly reduced. It is set larger.
[0032]
Subsequently, the first male screw portion 22 of each preload introduction jig 20 is screwed into one of the connecting screw holes 12a, 14a of the upper and lower flange plates 12, 14, and the second male screw portion 24 is moved to the other. A plurality of preload introduction jigs 20 are installed between the upper and lower flange plates 12 and 14 by screwing.
Further, a preload introduction jig 20 constructed between the upper and lower flange plates 12 and 14 by appropriately rotating the first member 26, the second member 28, and the third member using a wrench, a spanner or the like. Is adjusted so that a tensile load is applied to the preload introduction jig 20. As a result, the lower surface of the flange portion 40 of the third component 36c of the first member 26 and the upper surface of the first component 28a of the second member 28 are in contact with each other as shown in FIG. The relative displacement of the flange plate 12 and the lower flange plate 14 in the direction away from each other is restricted.
[0033]
Subsequently, by tightening the three nuts 44, 56, and 60 provided in the preload introduction jig 20, the second member 28 and the third member 30 are firmly fastened, and the preload introduction jig 20 and The upper and lower flange plates 12 and 14 are firmly fastened.
Subsequently, when the pressure device is unloaded, a plurality of preload introduction jigs 20 installed in place of the pressure device hold the preload introduced into the seismic isolation laminated rubber 10.
This completes the introduction of the preload. Thus, the seismic isolation laminated rubber 10 introduced with the preload is transported to the site and installed in the building. Depending on the construction conditions and the environmental temperature, there is a case where tightening is performed directly at the work place without using a hydraulic press machine or the like.
[0034]
When all the seismic isolation laminated rubbers 10 have been installed in the building, the preload introduction jig 20 is removed from each of the seismic isolation laminated rubbers 10. However, when the preload introduction jig 20 is removed, the actual building load has already been applied to the seismic isolation laminated rubber 10, and as described above, the magnitude of the preload obtained by calculation in advance and the seismic isolation lamination Since there is an error between the building load actually applied to the rubber 10, the actual building load often exceeds the preload.
Even in such a case, the preload introduction jig 20 is configured to allow relative displacement in the direction in which the upper and lower flange plates 12 and 14 of the seismic isolation laminated rubber 10 approach each other. The compressing load is not applied to the tool 20, and the distance between the flange plates 12, 14 can be shortened without any trouble. That is, in such a case, as shown in FIG. 3 b, the lower surface of the flange portion 40 of the third component 36 c of the first member 26 and the upper surface of the first component 28 a of the second member 28 are separated from each other. Therefore, the compressive load does not act on the preload introduction jig 20, and therefore, the preload introduction jig can be removed from the seismic isolation laminated rubber without gas cutting as in the case of using the conventional preload introduction jig. It does not lead to the situation of not.
Note that the use of the preload introduction jig 20 is not limited to the laminated rubber type seismic isolation device as in the embodiment, and is applied when introducing a preload to an elastic body such as an anti-vibration rubber or a coil spring, for example. Is possible.
[0035]
【The invention's effect】
  As is clear from the above description, according to the preload introduction jig, the preload introduction method and the preload introduction jig to the laminated rubber type seismic isolation device according to the present invention, the preload is applied to the laminated rubber type seismic isolation device. A first male screw that is screwed into a screw hole formed in one of the upper flange plate and the lower flange plate and a screw hole formed in the other, respectively. The upper flange plate has a screw portion and a second male screw portion, and the first male screw portion and the second male screw portion are respectively screwed into the corresponding screw holes of the flange plate. Between the upper flange plate and the lower flange plate, and a length between the first male screw portion and the second male screw portion is adjustable. In the state of being laid between The relative displacement in the direction away from each other of the flanges plates can restraint, yet is acceptably configured relative displacement towards each other of their flange platesThe first member, the second member, and the third member are located on the same axis, and the first member extends along the axis and has the first member at the end thereof. A male screw portion is formed, and the second member is rotatable relative to the first member about the axis, and a first position along the axis with respect to the first member. Between the first position and the second position, engageable with the first member at the first position and the second position, and the third member extends along the axis. The second male threaded portion is formed at the end, and the second member is threadedly engaged with the second member in the axial direction, and the amount of threading between the third member and the second member is adjusted. The length between the first male screw part and the second male screw part can be adjusted, and the upper flange plate and the lower flange plate can be adjusted. The relative displacement of the first member and the second member in a direction away from each other is determined by the second member engaging the first member at the first position. The upper flange plate and the lower flange plate are allowed to move relative to each other in a direction in which the upper flange plate and the lower flange plate approach each other. The second member is moved between the first position and the second position. This is done by allowing the displacement of the one member and the second member in the direction approaching each other.
  Therefore, after installing a laminated rubber-type seismic isolation device with preloads installed in the building by installing multiple preload introduction jigs between the upper flange plate and the lower flange plate, the size exceeds the introduced preload. Even if the building load is applied to the laminated rubber type seismic isolation device, it is not necessary to cut the preload introduction jig with a gas burner etc. Therefore, it is possible to remove the preload introduction jig, and therefore, it is possible to avoid adverse effects such as generation of cracks in the building due to gas cutting or the like of the preload introduction jig.
  In addition, the preload introduction jig used in the present invention does not need to be cut when it is removed from the laminated rubber type seismic isolation device, so it can be reused at all times. In addition, the cost can be reduced by reusing the preload introduction jig.
[Brief description of the drawings]
FIG. 1 is a side view of a laminated rubber type seismic isolation device in which a preload introduction jig according to an embodiment of the present invention is installed between an upper flange plate and a lower flange plate.
FIGS. 2a, 2b, and 2c are diagrams individually showing members constituting the preload introduction jig of FIG.
FIGS. 3A and 3B are diagrams illustrating the preload introduction of FIG. 1 for explaining the operation of the preload introduction jig when the interval between the upper flange plate and the lower flange plate of the laminated rubber type seismic isolation device is reduced. It is principal part sectional drawing of a jig | tool.
[Explanation of symbols]
10 Laminated rubber type seismic isolation device (Seismic isolation laminated rubber)
12 Upper flange plate
14 Lower flange plate
16 Laminated rubber body
20 Preload introduction jig
22 1st male thread
24 2nd male thread
26 First member
28 Second member
30 Third member
52 3rd male thread
AX axis

Claims (8)

建物の上部構造と下部構造とに夫々連結される上フランジプレート及び下フランジプレートと、前記上フランジプレートと前記下フランジプレートとの間に設けられ鉛直荷重を支持すると共に水平方向に剪断変形可能な積層ゴム体とを備えた積層ゴム型免震装置に予荷重を導入するための予荷重導入治具において、
前記上フランジプレートと前記下フランジプレートとの一方に形成されたネジ孔と他方に形成されたネジ孔とに夫々螺合される第１雄ネジ部と第２雄ネジ部とを有し、
前記第１雄ネジ部と前記第２雄ネジ部とを夫々に対応する前記フランジプレートの前記ネジ孔に螺合することで、前記上フランジプレートと前記下フランジプレートとの間に架設可能であり、
前記第１雄ネジ部と前記第２雄ネジ部との間の長さが調節可能であり、
前記上フランジプレートと前記下フランジプレートとの間に架設された状態において、それらフランジプレートの互いに離隔する方向への相対変位を拘束可能で、しかもそれらフランジプレートの互いに接近する方向への相対変位を許容可能に構成され、
互いに同一軸心上に位置する第１部材と、第２部材と、第３部材とを含んでおり、
前記第１部材は、前記軸心に沿って延在しその端部に前記第１雄ネジ部が形成されており、
前記第２部材は、前記第１部材に対して前記軸心を中心として相対回転可能であり、前記第１部材に対して前記軸心に沿って第１位置と第２位置との間で相対移動可能であり、前記第１位置と前記第２位置とにおいて前記第１部材と係合可能であり、
前記第３部材は、前記軸心に沿って延在しその端部に前記第２雄ネジ部が形成されており、前記第２部材と前記軸心方向において螺合し、
前記第３部材と前記第２部材との螺合量を調節することで、前記第１雄ネジ部と前記第２雄ネジ部との間の長さを調節可能にし、
前記上フランジプレートと前記下フランジプレートの互いに離隔する方向への相対変位の拘束は、前記第２部材が前記第１位置で前記第１部材に係合することで前記第１部材と前記第２部材との互いに離隔する方向の変位が規制されることによってなされ、
前記上フランジプレートと前記下フランジプレートの互いに接近する方向への相対変位の許容は、前記第２部材が前記第１位置と前記第２位置との間で前記第１部材と前記第２部材との互いに接近する方向の変位が許容されることによってなされる、
ことを特徴とする積層ゴム型免震装置への予荷重導入治具。An upper flange plate and a lower flange plate connected to the upper structure and the lower structure of the building, respectively, and provided between the upper flange plate and the lower flange plate for supporting a vertical load and capable of shear deformation in the horizontal direction. In a preload introduction jig for introducing a preload into a laminated rubber type seismic isolation device equipped with a laminated rubber body,
A first male screw part and a second male screw part respectively screwed into a screw hole formed in one of the upper flange plate and the lower flange plate and a screw hole formed in the other;
The first male screw part and the second male screw part can be installed between the upper flange plate and the lower flange plate by screwing the first male screw part and the second male screw part into the corresponding screw holes of the flange plate. ,
The length between the first male screw part and the second male screw part is adjustable,
In the state of being laid between the upper flange plate and the lower flange plate, it is possible to restrain the relative displacement of the flange plates in the direction of separating from each other, and the relative displacement of the flange plates in the direction of approaching each other. Configured to be acceptable ,
Including a first member, a second member, and a third member located on the same axis,
The first member extends along the axial center, and the first male screw portion is formed at an end thereof.
The second member is rotatable relative to the first member about the axis, and relative to the first member between a first position and a second position along the axis. Moveable, engageable with the first member in the first position and the second position;
The third member extends along the axial center, the second male screw portion is formed at an end thereof, and is screwed with the second member in the axial direction.
By adjusting the amount of screwing between the third member and the second member, the length between the first male screw portion and the second male screw portion can be adjusted,
The relative displacement of the upper flange plate and the lower flange plate in a direction away from each other is restricted by the second member engaging the first member at the first position. It is made by restricting displacement in the direction away from each other,
The relative displacement in the direction in which the upper flange plate and the lower flange plate approach each other is determined so that the second member is between the first position and the second position. Made by allowing displacement in the direction of approaching each other,
A preload introduction jig for laminated rubber type seismic isolation devices. 前記第１部材は、本体部と、該本体部に固設され前記軸心に沿って延在するロッド部とを有し、前記１雄ネジ部は前記ロッド部の先端に形成され、
前記第２部材は、前記軸心に対して同心関係にあるネジ孔を有し、
前記第３部材は、前記軸心に沿って延在するロッド部を含んでおり、前記第２雄ネジ部は該ロッド部の第１端に形成されており、前記第２部材の前記ネジ孔と螺合する第３雄ネジ部が該ロッド部の第２端に形成され、
前記第３部材と前記第２部材との螺合は、前記第３部材の第３雄ネジ部が前記第２部材のネジ孔に螺合することでなされている、
ことを特徴とする請求項１記載の積層ゴム型免震装置への予荷重導入治具。 Wherein the first member includes a body portion and a rod portion which is fixed to the body portion extending along said axis, said one male screw portion is formed at the tip of the rod portion,
Said second member has a threaded hole which is in concentric relationship with the axis,
The third member includes a rod portion extending along the axis, and the second male screw portion is formed at a first end of the rod portion, and the screw hole of the second member A third male threaded portion that is screwed with the second end of the rod portion;
The third member and the second member are screwed together by a third male screw portion of the third member being screwed into a screw hole of the second member.
The preload introduction jig for the laminated rubber type seismic isolation device according to claim 1. 前記第１部材の前記本体部が、前記軸心に対して同心関係にあり前記第２部材側へ延出した円筒部と、該円筒部の先端に形成された径方向外方突出部とを有し、
前記第２部材が、前記軸心に対して同心関係にある円孔が形成された板部を有し、
前記第１部材の前記円筒部が前記第２部材の前記円孔に挿通されており、
前記第２部材の前記第１位置は、前記第１部材の前記径方向外方突出部が前記第２部材の板部の前記円孔の縁部に係合することで形成され、
前記第２部材の前記第２位置は、前記第１部材の前記本体部が前記第２部材の板部に係 合することで形成される、
ことを特徴とする請求項２記載の積層ゴム型免震装置への予荷重導入治具。The main body portion of the first member has a cylindrical portion that is concentric with the axial center and extends toward the second member side, and a radially outward projecting portion formed at a tip of the cylindrical portion. Have
The second member has a plate portion in which a circular hole having a concentric relationship with the axis is formed,
The cylindrical portion of the first member is inserted through the circular hole of the second member;
The first position of the second member is formed by engaging the radially outward projecting portion of the first member with the edge of the circular hole of the plate portion of the second member,
It said second position of said second member, said body portion of said first member is formed by engaging the plate portion of the second member,
The preload introduction jig to the laminated rubber type seismic isolation device according to claim 2. 前記第３部材の前記ロッド部の両端に形成された前記第２雄ネジ部と前記第３雄ネジ部との一方が右ネジとして形成され、他方が左ネジとして形成されている、
ことを特徴とする請求項２または３記載の積層ゴム型免震装置への予荷重導入治具。One of the second male screw portion and the third male screw portion formed at both ends of the rod portion of the third member is formed as a right screw, and the other is formed as a left screw.
The preload introduction jig for the laminated rubber type seismic isolation device according to claim 2 or 3 . 建物の上部構造と下部構造とに夫々連結される上フランジプレート及び下フランジプレートと、前記上フランジプレートと前記下フランジプレートとの間に設けられ鉛直荷重を支持すると共に水平方向に剪断変形可能な積層ゴム体とを備えた積層ゴム型免震装置に予荷重を導入する予荷重導入方法において、
請求項１乃至４に何れか１項記載の予荷重導入治具を複数用意し、
加圧装置を用意し、
前記加圧装置に前記積層ゴム型免震装置を装填し、
前記加圧装置で前記積層ゴム型免震装置の前記上フランジプレートと前記下フランジプレートとを挟圧し所望の圧縮荷重を加えて前記積層ゴム体を圧縮することにより、前記上フランジプレートと前記下フランジプレートとの間の間隔を短縮し、
前記上フランジプレートと前記下フランジプレートとの間に前記複数の予荷重導入治具を架設し、
前記上フランジプレートと前記下フランジプレートとの間に架設した前記複数の予荷重導入治具の長さを調節して、前記上フランジプレートと前記下フランジプレートとの互いに離隔する方向への相対変位を拘束する、
ことを特徴とする積層ゴム型免震装置への予荷重導入方法。An upper flange plate and a lower flange plate connected to the upper structure and the lower structure of the building, respectively, and provided between the upper flange plate and the lower flange plate for supporting a vertical load and capable of shear deformation in the horizontal direction. In a preload introduction method for introducing a preload to a laminated rubber type seismic isolation device having a laminated rubber body,
A plurality of preload introduction jigs according to any one of claims 1 to 4 are prepared,
Prepare a pressure device,
The pressure device is loaded with the laminated rubber-type seismic isolation device,
The upper flange plate and the lower flange are compressed by pressing the upper flange plate and the lower flange plate of the laminated rubber type seismic isolation device with the pressurizing device and compressing the laminated rubber body by applying a desired compressive load. Reduce the distance between the flange plate,
The plurality of preload introduction jigs are installed between the upper flange plate and the lower flange plate,
By adjusting the lengths of the plurality of preload introduction jigs installed between the upper flange plate and the lower flange plate, the relative displacement of the upper flange plate and the lower flange plate in a direction away from each other Restraint,
A preload introduction method for a laminated rubber type seismic isolation device. 互いに同一軸心上に位置する第１部材と、第２部材と、第３部材とを含んでおり、
前記第１部材は、本体部と、該本体部に固設され前記軸心に沿って延在するロッド部とを有し、該第１部材の該ロッド部の先端に第１雄ネジ部が形成されており、
前記第２部材は、前記第１部材に対して前記軸心を中心として相対回転可能であり、前記第１部材に対して前記軸心に沿って第１位置と第２位置との間で相対移動可能であり、前記第１位置と前記第２位置とにおいて前記第１部材の前記本体部と係合可能であり、前記軸心に対して同心関係にあるネジ孔を有し、
前記第３部材は、前記軸心に沿って延在するロッド部を含んでおり、該ロッド部の第１端に第２雄ネジ部が形成されており、該ロッド部の第２端に前記第２部材の前記ネジ孔と螺合する第３雄ネジ部を有し、
前記第３部材の前記第３雄ネジ部と前記第２部材の前記ネジ孔との螺合量を調節することで、前記第１雄ネジ部と前記第２雄ネジ部との間の長さを調節可能にし、
前記第１雄ネジ部と前記第２雄ネジ部の互いに離隔する方向への相対変位を拘束可能で、しかもそれら前記第１雄ネジ部と前記第２雄ネジ部の互いに接近する方向への相対変位を許容可能に構成され、
前記第１雄ネジ部と前記第２雄ネジ部の互いに離隔する方向への相対変位の拘束は、前記第２部材が前記第１位置で前記第１部材に係合することで前記第１部材と前記第２部材との互いに離隔する方向の変位が規制されることによってなされ、
前記第１雄ネジ部と前記第２雄ネジ部の互いに接近する方向への相対変位の許容は、前記第２部材が前記第１位置と前記第２位置との間で前記第１部材と前記第２部材との互いに接近する方向の変位が許容されることによってなされる、
ことを特徴とする予荷重導入治具。Including a first member, a second member, and a third member located on the same axis,
The first member includes a main body portion and a rod portion fixed to the main body portion and extending along the axis, and a first male screw portion is provided at a tip of the rod portion of the first member. Formed,
The second member is rotatable relative to the first member about the axis, and relative to the first member between a first position and a second position along the axis. A screw hole that is movable, engageable with the body portion of the first member at the first position and the second position, and is concentric with the axis;
The third member includes a rod portion extending along the axis, a second male screw portion is formed at a first end of the rod portion, and the second end of the rod portion is A third male threaded portion that engages with the threaded hole of the second member;
The length between the first male screw portion and the second male screw portion by adjusting the screwing amount of the third male screw portion of the third member and the screw hole of the second member. Make it adjustable ,
Relative displacement of the first male screw part and the second male screw part in a direction away from each other can be restricted, and the first male screw part and the second male screw part are relatively close to each other. Configured to allow displacement,
The relative displacement of the first male screw portion and the second male screw portion in the direction in which they are separated from each other is restricted by the second member engaging the first member at the first position. And displacement of the second member in a direction away from each other is restricted,
The relative displacement of the first male screw part and the second male screw part in the direction in which the first male screw part and the second male screw part approach each other is such that the second member moves between the first member and the second member between the first member and the second member. Made by allowing displacement of the second member in a direction approaching each other,
A preload introduction jig characterized by that. 前記第１部材の前記本体部が、前記軸心に対して同心関係にあり前記第２部材側へ延出した円筒部と、該円筒部の先端に形成された径方向外方突出部とを有し、
前記第２部材が、前記軸心に対して同心関係にある円孔が形成された板部を有し、
前記第１部材の前記円筒部が前記第２部材の前記円孔に挿通されており、
前記第２部材の前記第１位置は、前記第１部材の前記径方向外方突出部が前記第２部材の板部の前記円孔の縁部に係合することで形成され、
前記第２部材の前記第２位置は、前記第１部材の前記本体部が前記第２部材の板部に係合することで形成される、
ことを特徴とする請求項６記載の予荷重導入治具。The main body portion of the first member has a cylindrical portion that is concentric with the axial center and extends toward the second member side, and a radially outward projecting portion formed at a tip of the cylindrical portion. Have
The second member has a plate portion in which a circular hole having a concentric relationship with the axis is formed,
The cylindrical portion of the first member is inserted through the circular hole of the second member;
The first position of the second member is formed by engaging the radially outward projecting portion of the first member with the edge of the circular hole of the plate portion of the second member,
The second position of the second member is formed by engaging the main body portion of the first member with a plate portion of the second member.
The preload introduction jig according to claim 6. 前記第３部材の前記ロッド部の両端に形成された前記第２雄ネジ部と前記第３雄ネジ部との一方が右ネジとして形成され、他方が左ネジとして形成されている、
ことを特徴とする請求項７記載の予荷重導入治具。One of the second male screw portion and the third male screw portion formed at both ends of the rod portion of the third member is formed as a right screw, and the other is formed as a left screw.
The preload introduction jig according to claim 7.

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