What is the difference between bridge expansion joints and construction expansion joints?

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.

Although bridge expansion joints and building expansion joints are both "expansion joints", they are significantly different in function, structure, material and maintenance requirements:

Application scenarios

The expansion joints of the bridge are arranged between the beam ends or abutments, which directly withstand vehicle impact, temperature cycling and rain and snow corrosion. Building expansion joints are installed on walls, roofs or floor slabs, and only respond to internal stresses caused by changes in ambient temperature, foundation settlement or earthquakes.

Form of construction

Commonly used modulus formulas (GQF-MZL), comb plate or seamlessTST elastoplastic body, which can withstand 80–1200 mm displacement; Most of the buildings are flat joints, vertical joints or seismic joints, and the displacement is usually ≤ 30 mm, and the foundation is constantly open.

Materials and loads

The bridge needs high-strength steel, fatigue-resistant rubber and multi-layer waterproof system to resist wheel impact; Buildings can be made of ordinary rubber, metal covers, or asphalt hemp wire, focusing on weather resistance rather than dynamic loads.

Maintenance level

Bridges are inspected quarterly to clean up debris, check anchors and waterstops; The maintenance cycle of building expansion joints is relatively loose, mostly half a year or annual inspection, and the impact of repair after damage is small. In short: bridge expansion joints are "heavy load, large displacement, and strict maintenance", and building expansion joints are "light load, small displacement, and easy maintenance".

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