Base Isolation Structure

摘要

A base isolation structure capable of securing stable operation since there is no such a possibility that micro-vibration usually produced does not exceed a requested allowable vibration value by developing base isolating effects in earthquake to prevent heavy damages from occurring and effectively isolating a structure in which vibration-sensitive equipments are disposed such as a semiconductor manufacturing plant from earthquake. A base isolation device ( 4 ) by a rigid sliding bearing having such a rigidity in the vertical and horizontal directions that micro vibration transmitted to the structure ( 1 ) can be reduced to a value smaller than the allowable vibration value determined according to the degree of the reluctance of the equipments is disposed between the structure ( 1 ) in which the micro vibration-sensitive equipments are disposed and the foundation ( 3 ) of the structure.