ZXSTEELGROUP
Steel Rail Accessories High density transport
Rail rail fasteners are rails that are used to connect rails and sleeper (or other types of rails), also known as intermediate links. Its role is to rail fixed on the sleeper, keep the gauge and prevent the rail relative to the sleeper in the vertical and horizontal movement. Railway rail fastener system is divided into: shrapnel fastener system, buckle fastener system, spring fastener system. The buckle fastener is composed of buckle plate, thread spike, spring washer, iron seat and cushion plate. The thread spike is anchored in the reserved hole of the concrete sleeper bearing table with sulfur cement mortar, and then the bolt Fastening.
Buckle fasteners have spring ?, ?, ? type. Projectile type ? by the ? ball, spiral spike, gauge baffle and rubber pad composition. Its buckle pressure is insufficient, the ball is too small.
The shape of the bucket type II is the same as that of the projectile type ?, and the stroke is not less than 10mm. Buckle pressure type ? is improved.
It is suitable for heavy traffic and high density transportation conditions. It has the advantages of high deduction pressure and good elasticity. In particular, it eliminates the concrete shoulder and eliminates the effect of the rail end in the lateral force The possibility of a transverse displacement occurs.
Rail fastener performance characteristics:
1) have sufficient strength and durability
Rail transit operation for a long time, high traffic density, poor maintenance conditions, requiring rail fasteners must have sufficient strength and durability to ensure traffic safety.
2) have a certain gauge and level adjustment performance
Rail traffic using the overall track bed structure, the line curve radius is small, the existence of wear and tear rail. This requires fasteners should have a certain gauge, the level of adjustment performance to solve the curve of the rail wear and structural uneven settlement and construction errors caused by the gauge, rail level overrun.
3) have good insulation performance
Rail traffic is generally used to track as a return rail, which requires fasteners must have good insulation properties, to prevent leakage of current through the fasteners, resulting in structural steel and municipal pipeline corrosion.
4) have good damping elasticity
Subway and other urban rail transit through the residential area, the vibration and noise reduction requirements of environmental protection is very high, rail fasteners must have a good vibration performance, attenuation of orbital vibration, reduce noise propagation.
5) have a certain general interchangeability
Fastener structure should be simple, few parts, with a certain general interchangeability, low cost, easy construction and maintenance.
High-strength bolts are one of the most representative products of special bolts, which have very high strength and long service life compared to ordinary bolts. Typically, high strength bolts are tempered and tempered to improve strength, and their microstructures are tempered martensite. This tempered martensitic steel once the tensile strength of more than 1200MPa, due to the role of trace hydrogen, the original grain boundary will be brittle, in the course of the phenomenon of delayed fracture becomes obvious.
