The difference between small resistance and constant resistance fastener of high speed rail
The three is in the construction of track laying, try to choose the season or time period and the minimum impact on the rail expansion, thus laying up, the problem will be a small part of.The Beijing Tianjin high-speed railway is now built long seamless rail, only the seams in the station area will be two to switch between stations, rail unit as a observation unit, each unit in the rail on both sides of the shoulder is buried with observation pile, regularly to crawl to measure the rail unit, when the amount of abnormal (also crawling is the internal stress anomaly), the need for stress relief construction, stress relief through elimination of rail because stress caused by the abnormal thermal expansion and contraction.
The second point adopts the tight pull, that is, the fastening of the rail is more firmly fixed on the ballast bed with the new fastener, and the high-speed railway basically adopts the ballastless track technology, and the fastening performance is better than that of the common railway.
The railway line to solve the rail expansion and contraction method is generally used for fastening the way, is the shrapnel into spring fastener fastener (also called spring bar fastener), rail tightly in the sleepers, forcibly will produce thermal expansion and contraction of the energy to digest, but the existence of such a problem is generated when the thermal expansion and contraction energy is greater than the distance unit of sleeper rail adhesion, makes up the phenomenon of rail, rail sleeper unit length twist. In order to solve this problem, the railway department within a certain distance, playing a few holes in the rail waist to release the energy generated by thermal expansion and contraction, and within a certain distance (about 1500m) retaining rail joint, to assist in releasing the energy generated by the thermal expansion and contraction, in order to solve the problem of rail expansion and contraction. First of all, the first point is that the steel of the rail is not made in China, all of them are imported, and the quality of the rail is guaranteed to the maximum extent.
