earthquake countermeasure of the bridge

Based on the lessons learned from the Great Hanshin-Awaji Earthquake, which caused severe damage, we have been promoting measures to reinforce piers and prevent bridge girders from falling in 1995 immediately after the earthquake. Click here for the bridge under seismic reinforcement

• Damage situation

Damage to piers caused by The Great Hanshin Earthquake

• Reinforced concrete winding method

A method of base treatment around the pillars, fixing the anchor on the porching and the pillars, assembling the reinforcing bar, casting concrete, and reinforcing it.

• Steel plate winding method

A method of base processing around the pillars, fixing the anchor on the porching and columns, welding the steel plate, painting, and reinforcing it.

The bridge fall prevention device prevents the bridge from falling due to fluctuations during an earthquake.

• Damage situation

Bridgefall by The Great Hanshin Earthquake

• Connection of girder and girder by PC steel rod

• Connection of girder and pier by chain

• In light of the damage caused by the Great Hanshin-Awaji Earthquake in 1995, bridges on emergency transportation routes and bridges across expressways and railways are designated as important bridges on the earthquake countermeasure, giving priority to earthquake countermeasure.

• Based on the experience of enormous damage to road bridges caused by the Great Hanshin-Awaji Earthquake that occurred in 1995, the seismic design standards for bridges were revised in 1996.
• In Great East Japan Earthquake, which occurred in 2011, seismic reinforcement was carried out in light of past earthquake disasters. As a result, there were no bridges with 1,079 expressways in Tohoku and 1,528 highways under direct control, except for five tsunami spills. (Emergency Recommendations based on the Great East Japan Earthquake on July 14, 2011, Excerpted from the Expert Committee on Highways)
• Even in the city of Yokohama, we believe that bridges completed by earthquake countermeasure will not be severely damaged in the event of the Hyogoken Nanbu Earthquake or the Tohoku-Pacific Ocean Earthquake Class earthquake.