Including spike, rail pad and flexible or rigid withhold parts, etc. Fasteners should be able to effectively maintain rail and sleeper, long-term, reliable connection and can give full play to its buffer shock absorption performance under dynamic action, delay the orbit residual deformation accumulation. So it should have sufficient strength, durability, and a degree of elasticity that should also be simple structure, easy to install and remove. In addition, for the prestressed concrete sleeper, button fastener should also have enough pressure and the gauge, level adjustment quantity.

Rail Fastener performance characteristics

According to the requirements of rail transit, the new type rail fastener should possess the following features:

1) have enough strength and durability

Rail transit operation time is long, high traffic density, poor maintenance condition, for rail fastener must have enough strength and durability, to ensure driving safety.

2) have a certain level of track and adjust the performance

Rail transit with the track structure, the line small curve radius, rail abrasion. This requires that the gauge, level of fasteners should be adjusted performance, in order to solve the curve rail abrasion and the structure of error caused by the uneven settlement and construction level gauge, rail overrun.

3) have good insulation performance

Rail transit are commonly used line tracks as reflux rail, which requires the fasteners must have good insulation property, prevent current leakage through the fasteners, cause structural steel and municipal pipeline corrosion.

4) good vibration damping elasticity

Subway through in the residential area of urban rail transit, such as environmental protection requirements for vibration noise reduction is very high, the rail fastener must has a good vibration damping performance, attenuation rail vibration, reduce noise transmission.

5) there is a certain general interchangeability

Fasteners should strive to simple structure, less parts, has certain general compatibility, low cost, the construction and easy maintenance.