1. Why are spike heads designed flat?
Flat heads provide greater contact area to prevent damage to wooden ties. Standard head dimensions are 32×32mm with 8-10mm thickness. This design evenly distributes wheel-rail impact forces while allowing easy hammer strikes during installation. The flattened surface also resists rotation better than rounded designs.
2. How do spike dimensions vary by rail weight?
Light rails (30kg/m): 12×12mm shank, 100mm length
Medium rails (50kg/m): 16×16mm shank, 130mm length
Heavy rails (60kg/m+): 20×20mm shank, 150mm length
Dimensions follow AREMA or UIC standards based on regional requirements.
3. What causes spike popping (ejection)?
Primary causes:
Wet wood expansion then shrinkage
Excessive vibration from wheel flats
Corrosion-induced friction loss
Thermal cycling in extreme climates
Popped spikes must be replaced immediately to maintain gauge.
4. How are spikes removed without damaging ties?
Specialized extraction methods:
Claw pullers with leverage arms
Hydraulic spike extractors (for large-scale work)
Drilling out severely corroded spikes
Pre-soaking with penetrating oil reduces wood splintering.
5. What's the torque specification for screw spikes?
Wooden ties: 80-100 N·m
Concrete ties: 120-150 N·m
Over-torquing cracks ties; under-torquing causes loosening. Digital torque wrenches ensure precision.