How do the rails of high-speed railways dock?
In fact, thousands of meters of seamless line is a long rail line welded by a number of rails of ordinary length, shipped to the site and welded to a design length of 1km or 2km, or even longer. According to the coefficient of expansion and contraction of the rail, when the temperature increases by 1 DEG C, the rail with 1m length will grow 0.0118mm longer than the original. Thousands of meters of rail expansion, cold contraction length is considerable, winter may cold contraction and fracture, summer may swell and collapse.
Seamless rail has been widely used, that is, hundreds of meters or even thousands of meters long rail, there is no gap between the interface, can avoid too much because of the interface caused by a lot of noise, and wear.
Solve the thermal stress of thermal expansion and contraction by the following ways:1, perfect temperature monitoring equipment.2, the manufacturing process to reduce thermal expansion and cold contraction effect. When laying, should also choose the appropriate temperature, so that the minimum value of expansion.3, the tracks are locked on the sleepers so that their stresses are forced to lock. In regions with large temperature differences, regular discharge stresses should also be applied. It is said that the sudden release of the construction site stress, momentum is amazing!
