Sliding seismic isolation device and bridge

摘要

PROBLEM TO BE SOLVED: To provide a slip seismic isolation device capable of exerting a suitable function according to each earthquake level and suppressing damage to an upper structure and a lower structure at the time of a large earthquake, and this slip seismic isolation device. Providing bridges especially for fixed bearings. A sliding seismic isolation device (30) having an upper shoe (31) and a lower shoe (32) and a slider (38) slidable therebetween, and a pair of movement direction regulating jigs (35) straddling the upper shoe (31) and the lower shoe (32). The upper shoe 31 and the lower shoe 32 are mutually fixed by the above, and the movement direction restricting jig 35 is broken when a horizontal force of a first predetermined value or more acts on one of the upper shoe 31 and the lower shoe 32. It is fixed by the first knock-off bolt 50, and is fixed to the other of the upper shoe 31 or the lower shoe 32 by a bolt different from the first knock-off bolt 50, and when the first knock-off bolt 50 breaks, The relative movement direction of the upper shoe 31 with respect to the lower shoe 32 is regulated by a pair of movement direction regulation jigs 35. [Selection diagram]