Expansion joints generally refer to gaps (seams) reserved to prevent thermal expansion and contraction. For example, the originally used railway rails, the joints reserved between two rails, will elongate due to the thermal expansion of the rails in summer. The gap will become smaller; the temperature will drop in winter and the rail will shrink and the gap will become larger. At present, all steel rails are welded rails, and the change of the arc is used to solve the problem of thermal expansion and contraction of the steel rail. Stations or turnouts still use expansion joints to deal with thermal expansion and contraction.
Expansion joints prevent cracks in the house due to climate change. The method is to reserve gaps at regular intervals along the length of the building to disconnect the building from the roof, walls, floors and other above-ground components. The building foundation is less affected by temperature changes because it is buried in the ground. disconnect. The width of the expansion joint is generally 2 cm to 3 cm, and the insulation material is filled in the joint. The distance between the two expansion joints is clearly stipulated in the building structure code.