BASE ISOLATION BUILDING

To provide a base isolation building 1 which can prevent a base isolation pit 30 from being immersed in water even when an immersion depth exceeds a height of a retaining wall 23, and can be easily constructed with a simple constitution.SOLUTION: A base isolation building 1 includes a foundation structure 20, a plurality of base isolation mechanisms 22 installed in a base isolation pit 30, an upper structure 10 supported by the base isolation mechanisms 22, and a rubber sheet 40 provided between the foundation structure 20 and the upper structure 10. The foundation structure 20 includes a retaining wall 23 provided along an outer peripheral edge. The rubber sheet 40 passes through a gap 32 between an upper end 25 of the retaining wall 23 and a lower surface 14 of the upper structure 10 facing the upper end 25 from one end 42 fixed to the side of the base isolation pit 30 of the retaining wall 23, and extends to the other end 44 fixed to the upper structure 10 on the side of the base isolation pit 30 relative to the gap 32.SELECTED DRAWING: Figure 2 【課題】本発明は、浸水深さが擁壁２３の高さを超えても、免震ピット３０への浸水を防ぐことができ、かつ、単純な構成により施工が容易な免震建物１を提供する。【解決手段】本発明に係る免震建物１は、基礎構造２０と、免震ピット３０内に設置された複数の免震機構２２と、免震機構２２に支持された上部構造１０と、基礎構造２０と上部構造１０との間に設けられたゴムシート４０と、を備える。基礎構造２０は、外周縁に沿って設けられた擁壁２３を備える。ゴムシート４０は、擁壁２３の免震ピット３０側に固定された一端４２から、擁壁２３の上端２５と上端２５と対向する上部構造１０の下面１４との隙間３２を通って、隙間３２に対して免震ピット３０側の上部構造１０に固定された他端４４へ延びる。【選択図】図２