How to Solve the Thermal Expansion and Contraction of Steel Rails of Railway Lines

The method of to solve the thermal expansion and contraction of steel rails of railway line is generally to use Fastening System to fasten, which is to replace the spring blade fasteners with spring clip fasteners (also called elastic clip fasteners), and fasten the rails tightly on the railway sleepers. The energy generated by thermal expansion and contraction is digested, but there is a problem in this way. When the energy generated by thermal expansion and contraction is greater than the adhesion of the sleeper per unit distance, it will cause the rail to expand. The rail of the sleeper per unit distance Distortion occurs. To solve this problem, the railway construction or maintenance company needs to drill several holes in the rail waist within a certain distance to release the energy generated by thermal expansion and contraction, and retain the rail joints within a certain distance (about 1500m) to assist in the release of heat. The energy produced by expansion and contraction can solve the problem of thermal expansion and contraction of steel rails.

1. High-quality steel, guarantee the quality of the rail to the maximum extent.
2. The new type of rail fasteners more firmly fix the steel rail on the track bed, and the high-speed railway basically adopts ballastless technology, which has better tightening performance than ordinary railways.
3. During the construction of rail laying, try to choose the season or time period that has the least impact on the thermal expansion and contraction of the rail, so that the problems caused by the laying will be small.
The Beijing-Tianjin high-speed railway built in China is an ultra-long seamless steel rail, and there are only seams in the turnout area of the station. The unit rail between the two stations is used as an observation unit, and each unit rail is buried on the shoulders on both sides of the rail. There are observation piles, and the creep measurement of the unit rails is carried out on a regular basis. When the creep amount is abnormal (that is, the internal stress is abnormal), stress relief construction is required to eliminate the abnormal stress caused by thermal expansion and contraction of the rail through stress relief.

4. There is a telescopic adjuster on the long-span steel girder bridge to adjust the expansion and contraction of the steel rail.