Bridge Engineering Blog & Technical Insights

Bridge expansion joint: refers to the bridge deck deformation requirements, usually set between the two beam ends, between the beam end and the abutment, or at the hinged position of the bridgeexpansion joints。 It is required that the expansion joint can be freely expanded and contracted in both directions parallel and perpendicular to the bridge axis, firm and reliable, and the vehicle should be smooth when driving smoothly, without jumping and noise. it should be able to prevent rainwater and garbage and soil from seeping into and blocking; Installation, inspection, maintenance, and elimination of dirt should be simple and convenient. At the place where expansion joints are set, the railing and the bridge deck pavement must be disconnected.

In the past, a rail was 12.5 meters long, and when passing through the rail seam, thewheels would hit the end face of the track, and there would be a clicking sound. At thistime, the wooden pillow is actually placed on the gravel, calledThere is a ballast track. The stone at this time plays a role in delaying the impact. The length of the track is only12.5 meters, and there is a gap at the end of the track, and its ductility is negligible. At thistime, the speed was not fast, tens or hundreds of kilometers, and the wheels at this timecould still withstand the impact.

Expansion joint basisJT/T723-2008"Unit Type Multi-directional Displacement Comb Plate Bridge Telescopic Device",JT/T32-2004"Highway Bridge Telescopic Device",JT/T327-2016The "General Technical Conditions for Highway Bridge Telescopic Devices" is developed by dynamic analysis.

Bridge expansion joints are a crucial component of bridge structure, mainly used to cope with the expansion and contraction deformation of bridges caused by temperature changes, vehicle loads, concrete shrinkage creep and other factors, and ensure the safety and driving comfort of the bridge structure.

In bridge construction,expansion jointsIt is an important structural element that adjusts the expansion and contraction of the bridge deck under temperature changes, concrete shrinkage and load, and prevents the bridge from being subjected to excessive tensile force. This article will detail the role and importance of bridge expansion joints.