VIBRATION ISOLATION METHOD OF BRIDGE AND CONSTRUCTION OF VIBRATION ISOLATION

PROBLEM TO BE SOLVED: To lower vibration energy by erecting the basic section of a damper member of ultra-low yield point steel, etc., on an abutment, etc., connecting the upper part thereof to a girder, and bearing vertical load of the girder on a movable bearing provided on the abutment, etc. SOLUTION: A steel vessel type stopper contraction 23 forming an inward thick flange part forming an opening edge of the upper end as a stopper is embedded into concrete forming an abutment A. A bar-shaped damper member 4 formed of ultra-low yield point steel is vertically erected at a position sharing the center line of the stopper construction 2 is a hollow section thereof while keeping a clearance in a specific size, and a fixed plate 5 of the basic section is fixed with an anchor bolt 6. A bearing pin 8 is inserted into a pin hole 7 formed in a long slot transferring no axial force influenced by thermal deformation on the upper end of the damper member 4 at a right angle to the bridge axis and, at the same time, both ends of the bearing pin 8 is fixed to a girder B borne on the abutment A through a movable bearing 1.