Specialized Fastening Systems for High-Speed Rail (300+ km/h)

High-speed rail demands exceptional stability and vibration control from fastening systems.

Unique Requirements:

Higher Clip Forces: Minimum 12 kN tension to resist aerodynamic lift (vs. 8 kN for conventional rail).

Tuned Damping: Frequency-specific rail pads (e.g., 30-50 Hz range for Shinkansen).

Thermal Expansion: Systems must accommodate ±20mm rail movement.

Key Technologies:

WJ-8 Fasteners (China):

Dual-elasticity pads + shoulder-free clips for 350 km/h operation.

Vossloh 336 (Europe):

Low-height design (-15mm) reduces air turbulence.

Shinkansen Direct Fixation (Japan):

Epoxy-adhered fasteners on concrete slabs eliminate ballast.

Installation Challenges:

Laser-guided alignment required (tolerance: ±0.3mm vertical).

Pre-stressed clips need hydraulic tensioners.