Fast Clip Fastening: A Trend Of Rail Fastening System

fas clip fastening system

The fast clip rail fastening system is a new type of rail fastening system, which represents the latest level and development direction of railway fastener technology, and it has been widely used in the railway of Europe (CEN), Germany (DB-AG), France (SNCF), Japan ( RTRI), Australia (AS) and North America (AREA) and other countries. The fast clip railway fastening system is also introduced and applied to the railway line in China. The two sections of Hefei Passenger Dedicated Line, Shitai Passenger Line will adopt such rack fastener system.

FC rail fastener system is always used for the ballasted track. It has been widely used in some high-level railway lines in Europe and America, such as the French TGV high-speed railway line, with a design speed of 350KM/h. It has also been widely used in the Japanese Shinkansen in Asia and the high-speed railway in South Korea, and the effect is good.

About FC rail fastening system

Fc fastener system composition and main technical requirements:

  1. Flexible separation;
  2. no shoulder;
  3. With railroad tie plate;
  4. No track bolt buckle;
  5. No adjustment of the height;
  6. The elasticity is not separated;
  7. The gauge adjustment is -8 ~ +4mm;
  8. Buckle pressure is 10kn;
  9. The range of 12mm;
  10. Static stiffness: 80 ~ 100kn / mm.

The FC fastener system is shoulder-free and bolt-free fasteners, it has less spare parts, compact structure and strong track-keeping capability. The base is pre-embedded when the concrete sleeper is made, and the elastic clip is pressed against the rail by inserting the embedded base. An insulating rail gauge block is arranged between the embedded base and the steel rail, and the left and right positions of the rail are adjusted by replacing the insulating gauge block. This rail fastener cannot be adjusted for rail height.

Fastener composition

fast clip rail fastening system

  • The Fc fastener system consists of a fast clip, an insulating cap, a pre- embedded base, an insulated gauge block and a rail rubber pad.
  • Fast elastic clips are divided into Fcl504 type, Fcl502 type and Fcl306 type. Fcl504 type rail clip (15mm in diameter with 8494 insulating cap) is installed in the general section. FCl502 type elastic bar (15mm in diameter and no insulating cap) is installed at the splint. FCl306 type elastic bar is installed in the small resistance area (diameter is 13mm with 12133 type insulating cap).
  • Insulation gauge blocks have a total of 10 specifications, respectively, 6 to 15 mm thickness.

Main technical requirements

  • The sum of the gap between the rail and the insulation gauge block, or the gap between the insulation gauge block and the embedded iron seat should not exceed 1 mm.
  • The pressure should not be less than 9kN (small resistance clips should not be less than 3kN).
  • Distance adjustment: -8 to +8mm, the rail gauge and rail adjustment are made by replacing the insulation gauge blocks of different numbers.
  • Low adjustment: the fasteners cannot be adjusted in height, and the rail pad should not be raised.
No. Item Performance Index
1 Applied rail type GB standard 60kg steel rail
2 Rail gauge 1435mm
3 Rail bottom slope 1:40 rail bottom slope is placed on the railway sleeper
4 Longitudinal resistance of rails In general, the longitudinal resistance of each set of rail fastener and rails is larger than 9kN;
5 Elasticity of rail fastening system The rail pad has a static stiffness of 50 to 70 kN/mm.
6 Fatigue performance  After 3 million load cycles, the fastener system has no damage, and the buckle pressure changes is less than 20%; the longitudinal resistance of the rail changes is less than 20%; the static stiffness of the joint changes is less than 25%.
7 Insulation resistance The fastener system is tested according to EN13146-5, and the insulation resistance between the two rails is greater than 5kΩ.
8 Harsh environmental conditions The fastener system can be successfully disassembled with a manual disassembly tool after the 300h salt spray test described in EN13146-6.
9 Adjustment amount between left and right of rail The adjustment of the left and right position of the single-strand rail: -4~+2mm;
Rail gauge adjustment: -8 ~ +4mm, adjustment level is 1mm.
10 Rail height position The adjustment amount is 0mm.
11 Buckle pressure and spring range FC1504 type spring bar: buckle pressure is 10kN, spring range is 12mm;
FC1306 type spring bar: buckle pressure is 3kN.
12 Pulling resistance of the embedded parts pulling resistance of the embedded iron seat in the railway sleeper is not less than 60kN.