Rail selection and routine maintenance

rail selection

Rail is the main component of track laying and plays an important role in guiding wheels, supporting vehicles, and transferring loads. With the rapid development of railway transportation and heavy-duty railways, more and more attention is paid to the use and maintenance of rails. For the laying of rails, safety and reliability must be met, the service life of rails should be reasonably extended, the optimization of rail usage should be realized, and the construction of rails should be reduced. maintenance costs.

The rational optimization of rail tracks focuses on the following points:

1. The track is laid with a seamless line, which minimizes the fishplate connection of the joints of the rails and reduces the damage to the rails caused by the reaction force caused by the unevenness of the joints of the rails when the train passes.

2. Improve the purity of the rail material, reduce the rail under the repeated action of the train load, cause the rail to produce transverse fatigue cracks and other fatigue damage, and prolong the fatigue life of the rail.

3. According to the track laying environment, according to the requirements of the line, adjust measures to local conditions, make a scientific layout, and reasonably select the steel rail of corresponding material and strength. For small radius curved rails and rails for turnouts, online heat-treated rails should be used.

4. For the mainline railway, the new rail head profile 60N and 75N long fixed-length rails should be preferentially used to improve the contact surface between the wheelset and the rail and reduce the splint connection joints of the rail.

5. Through the optimized design of the profile of the rail head, the rail is properly ground, the profile of the rail is maintained, combined with rail maintenance measures, the number of rail lubrication is increased, and the friction coefficient of the rail top is reasonably controlled, and the wheel-rail creep force is reduced. The force and rolling resistance of the wheel and rail can effectively prevent and timely eliminate the disease of the rail, improve the relationship between the wheelset and the rail, and prolong the service life of the rail.

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