Preventing falling bridges of existing bridge girders subject to earthquake and tsunami action

摘要

PROBLEM TO BE SOLVED: To provide a bridge fall prevention method for an existing bridge girder that considers for a structural system of bridge pier and girder exposed to seismic and tsunami force.SOLUTION: In a bridge fall prevention method for an existing bridge girder exposed to seismic and tsunami force: a reinforcing bar 3 is installed by drilling a hole through existing bridge girders B on right and left to suit a diameter of the reinforcing bar, and inserting and fixing the reinforcing bar 3 into the hole; a reinforcing bar is installed by drilling a hole through the bridge pier A for a receiving beam 2 to suit a diameter of the reinforcing bar, and inserting and fixing the reinforcing bar into the hole for the receiving beam 2; a concrete mold is placed, and a reinforcing bar is arranged; a bridge fall prevention device 1 is installed, and concrete is cast; the receiving beam 2 is installed by drilling a hole beforehand through the bridge fall prevention device 1 for inserting the reinforcing bar, and a cushioning material 4 is installed between the bridge fall prevention device 1 and both bridge girders B.SELECTED DRAWING: Figure 1