Bridge expansion joint: in order to meet the requirements of bridge surface deformation, the expansion joint is usually set up between the two beam ends, between the beam end and the abutment or the hinged position of the bridge. Requirements of the expansion joint in parallel and perpendicular to the axis of the bridge in two directions, can be freely telescopic, firm and reliable, the vehicle should be smooth, no jump and noise; To prevent rain and garbage soil infiltration blocking; Installation, inspection, maintenance and elimination of dirt should be simple and convenient. In the setting of expansion joints, railings and bridge deck pavement should be disconnected.

The role of the bridge expansion joint is to adjust the displacement and connection between the superstructure caused by the vehicle load and the bridge building materials. Once the expansion device of skew bridge is destroyed, it will seriously affect the speed, comfort and safety of driving, and even cause traffic safety accidents.