DAMPER FOR USE IN EARTHQUAKE-RESISTANT STRUCTURE OF BRIDGE AND RECOVERY METHOD OF EARTHQUAKE-RESISTANT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a damper that enables the damper to be relatively easily replaced or returned to an initial position, even when a residual stress remains in the damper due to an earthquake, etc.SOLUTION: A main clamping bolt 24 is combined with a press bolt 26 in order to produce a gap of a predetermined interval to a joint part 35 at least in any of both ends of a damper 9 configured from internal and external tubular bodies joined by the joint part 35 between a pier and a bridge. Thereby, even when a relative displacement is caused between a pier and a bridge due to an earthquake, etc., and a residual stress due to deformation, etc., remains in the damper 9, the damper 9 is made to produce an appropriate gap with respect to the joint part 35 by the retraction of the main clamping bolt 24 and the progress of a press bolt 26, and the residual stress of the part of the damper 9 internally having a compressive force or a stretching force is eliminated. Accordingly, the damper 9 is easily taken out from between the joint parts 35, and the damper 9 displaced by the earthquake can be replaced and recovered.