Key techniques for rail fastening system overview

 

According to requirement of track circuit, rail fastening system must have good insulation property in the dry-wet-cycle condition. So that key techniques for rail fastening system is required to improve water resistor.

Versatility of rail fastening system in continuous welded rail track

• As requirement of laying continuous welded rail track, rail fastening system in tunnel and ballast should have enough anti-creeping resistance. In general, the bigger anti-creeping resistance, the better welded rail track will be. So it usually use rail clip with bigger crimping force to fasten rail.


• For laying continuous welded rail track on the bridge, it always adopts rail fastenings with less anti-creeping resistance. In another word, using rail clip with less crimping force to fasten rail. Besides, rail clip should be used with low friction coefficient rail pad.


• In sum, the key technique for rail fastening system requires the versatility of rail fastening system. Rail fastening system should installing rail clip with bigger crimping force and installing rail clip with less crimping force.

Versatility of rail fastening system in ballastless track structure

Ballastless track structures vary, but from the view of design, construction and operation management, it requires rail fastening system has versatility. Both sleepers buried ballastless track and slab ballastless track can use one rail fastening system together. Key techniques for rail fastening system include fitting various ballastless track structures.

Crimping force loss and fatigue life

The rigidity of rail pad decrease, which means rail pad have large deformation during train passing. At the same time, front of rail clip have bigger dynamic deformation. It has higher need on elastic property and fatigue property of rail clip. When low-rigidity rail pad applied, the key technique is control crimping force loss and fatigue life of rail clip.

The reliable connection between rail fastening system and concrete foundation

Ballastless track usually adopt elastic separated rail fastening (with a tie plate). According to functional need, tie plate is fastened on the concrete foundation through anchor bolt and rail plastic dowel cooperation (which is pre-imbeded into the concrete). Based on experience, strength and fatigue life of embedded parts in construction is a weak link. Improve the strength and fatigue life is one of the key techniques need to be solved.

Less spare parts and easy operation mode

Summarizing experience on ballastless track, adjustment amount of rail location is large and accurate. In conclusion, good rail fastening system has less spare parts and adopt easy operation mode to adjust rail position. When the left and right side is adjusted, try to avoid changing fastening. Stepless adjusting will be the best adjusting mode.