空気ばねと積層ゴムを組合せた免震・除振床システムの開発

抄録

An earthquake and microtremor isolation floor system is developed for high-tech facilities such as computer rooms, VLSI factories and those manufacturing lasertechnology-applied products. The system consists of 3-dimensional isolators, air dampers, viscous dampers and leveling controllers which automatically maintain the level of the floor. The 3-dimensional isolator, which is made from the compound construction of an air spring and a laminated rubber bearing, absorbs vertical vibration by the air spring, which the horizontal one is primarily by the laminated rubber bearing. To examine the effectiveness of the system, seismic shaking tests and microtremulous tests of a floor model weighing 20 tons were performed. The results are satisfactory and the effective isolation of both earthquakes and microtremors is confirmed. It is observed that the numerical predictions are in good agreement with the experiment results.