Type IV clip rail fastener system

Type IV Elastic Clip Fastening System Details:

• High-speed railway with a 350km/h speed rating with a mobile unit (maximum axle weight 170kN);
• The 250km/h speed grade high-speed railway with the mobile unit (maximum axle weight 170kN) can take into account a small number of ordinary passenger vehicles (the maximum axle weight of the locomotive is 230kN) and a small number of trucks (the maximum axle weight is 230kN).

IV Type Fastener Parts Mechanical Property:

1. Each set of fasteners buckle pressure ≥ 20 kN;
2. The longitudinal resistance of each fastener rail is greater than 9 kN;
3. The fastener system shall not be damaged after 3 million load cycles, and the gauge length shall be less than 6 mm;
4. The insulation resistance between two rails is greater than 3 Ω•km, and meets the insulation resistance requirements of the track circuit;
5. System elasticity: The static stiffness of the rubber cushion is 60 kN/mm (±10 kN/mm)
6. After the 300 h salt spray test described in EN 13146-6, the fasteners can be dismantled with manual removal tools;
7.  Left and right position adjustment of single-strand rail: -4 ~ +2 mm, gauge adjustment: -8 ~ +4 mm;
8. The pull-out force of the embedded iron seat should not be less than 60 kN.

Type IV Elastic Clip Fastener Introduction:

The shoulderless bolt fastening system is based on the type III fastener system of the original elastic bar after many years of in-depth research and optimization of a large number of test improvements. The Type IV elastic rail clip fastening system are optimized and improved in 4 aspects:

1. The structure of the elastic strip is further optimized, its working stress is reduced, and the residual deformation is reduced;
2. The physical properties of the rubber cushion adopt UIC standards to meet international standards. ;
3. In order to achieve precise adjustment of the track gauge, the insulation gauge block number is configured at a 1mm level;
4. higher requirements are placed on the manufacturing acceptance of components.

Features of Type IV Elastic Clip Rail Fastening System

1. Fastening System Parts
   The fastener system consists of a C4 elastic strip, an insulating gauge block, a rubber rail pad, and a pre-embedded rail tie plate that is positioned on a prestressed concrete shoulderless sleeper. JA, JB clips and joint insulated gauge blocks are used at the rail joints.
2. Structural features
   As with type III elastic clip fastener system is a boltless fastener system and is an elastic non-detachable fastener without concrete shoulders. It has the advantages of less parts, compact structure, high buckle pressure, strong track gauge capability, low maintenance workload, etc. It is especially suitable for railway line with large-scale mechanical operation. Its main structural features are as follows:
   a) Pre-embedded iron plates are embedded in the concrete sleepers. The elastic clips are pressed into steel rails by inserting embedded iron seats without bolts.
   b) An insulated gauge block is installed between the embedded iron seat shoulder and the rail to adjust the gauge and to perform insulation. The rail left and right positions can be adjusted by replacing different numbers of insulated gauge blocks.
   c) Rubber cushions between the rails and the concrete track sleepers provide insulation cushioning and damping.
   d) The fastener system is used in conjunction with prestressed concrete rail sleepers without shoulder. The elastic clip type of IV fastener structure can be installed on the original type IIIb prestressed concrete sleeper.
3. Supporting sleeper interface technical requirements
   The technical requirements of the fastener system on the sleeper interface are mainly the type size of the bearing groove and the embedded position and accuracy of the embedded iron tie plate in the sleeper, and it is matched with the existing IIIb type non-blocking prestressed concrete sleeper.

Type IV Elastic Clip Fastening System Specification:

Clip V Rail Fastening System Specification: