Seismic isolation bearing

PURPOSE: A seismic isolation system is provided to improve fire resistance by adding an inorganic flame retardant material to an outer elastic body of an elastic bearing. CONSTITUTION: A seismic isolation system comprises a lower support(10), an upper support(20), an elastic bearing(40), and a fireproof member(30). The upper support is separated from the top of the lower support. The elastic bearing is arranged between the upper and lower supports. The fireproof member surrounds the elastic bearing and comprises a core(41), a core protection sheet(42), an elastic plate(46), a reinforcement plate(47), and an outer elastic body(48). The core protection sheet surrounds the side surface of the core and comprises a reinforcement fiber(43). The elastic and reinforcement plates surround the core and the side surface of the core protection sheet. The outer elastic body surrounds the elastic plate and the side surface of the reinforcement plate.