ASEISMIC BASE ISOLATION DEVICE

PROBLEM TO BE SOLVED: To provide an aseismic base isolation device capable of easily adjusting performance such as responsiveness, restoring force, by inserting a shaft body fixed to a structure through the inside of a solenoid coil fixed to the foundation of the structure and providing a magnet at a part corresponding to the inside of the solenoid coil of the shaft body. SOLUTION: Shaft bodies 2a and 2b extending in the three-dimensional direction orthogonal to each other are fixed below a foundation 11 of a bridge 10, four shaft bodies 2a extending in the horizontal direction are inserted through a horizontal base isolation solenoid coil 3a, and a shaft body 2b extending in the vertical direction is inserted through a vertical base isolation solenoid coil 3b, respectively. A permanent magnet 5 of which both magnetic poles are directed axially is embedded in a part corresponding to the inside of each of the solenoid coils 3a and 3b in the longitudinal direction of each of the shaft bodies 2a and 2b. A damper 1 is constituted from these shaft bodies 2a and 2b, the solenoid coils 3a and 3b, etc., and an aseismic base isolation device is constituted by arranging two pairs of each of such dampers 1 toward each direction so as to be orthogonal to each other three-dimensionally.