CENTER PILLAR BASE ISOLATION DEVICE FOR UNDERGROUND STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a center pillar base isolation device for an underground structure with high reliability, which can reduce the shearing force and bending moment applied to the floor surface, the ceiling surface of an underground structure and the upper and lower ends of a center pillar while the rotational rigidity is adjusted. SOLUTION: This base isolation device 20 is installed on at least one of upper and lower ens of a center pillar 10 erected between the floor surface and the ceiling part of a cylindrical underground structure to support between the floor part and the ceiling part, and formed by stacking a center pillar side member 21 and an underground structure side member. The center pillar side member 21 and the underground structure side member respectively have basement parts 22 and contact parts projected rom the basement parts 22 opposite to each other with the mutual contact surfaces curved to fit to each other, and have a rubber elastic body interposed between the basement parts on both sides in the slidable direction of the contact part. The rubber elastic body is formed by vulcanizing bonding, and may be formed like a ring surrounding the periphery of the contact part. The contact surface may be provided with a friction reducing member.