| 摘要 |
PROBLEM TO BE SOLVED: To surely reduce an earthquake motion also for a lightweight building, and increase a durability of the building. SOLUTION: In a base isolator 5 a synthetic rubber material 51 is formed of a pure member. Namely, a conventional metal plate is not stacked on the rubber material. Accordingly, the rubber material can be surely and sufficiently deformed elastically and, even when a building body 4 is lightweight, the rubber material can satisfactorily absorb a vibration energy. In an integral unit formed of the synthetic rubber material 51 and a sliding support 53 the synthetic rubber material 51 is covered by the sliding support 53. Thus in the synthetic rubber material 51 installed along the outer periphery of a building, the material thereof can be prevented from being deteriorated by suppressing the effect of an external environment such as wind and rain, and not only the durability of the synthetic rubber material 51 but also the durability of the base isolator 5 can be increased.
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