Transportation and Fixing Methods for National Standard Rails
- How to fix 25-meter national standard rails on railway flatcars?
25-meter national standard rails must use the "four-point fixing method", with two sets of special clamps at both ends and the middle of the flatcar, each set 5 meters apart. A 3mm thick rubber pad must be placed between the clamp and the rail contact surface to avoid scratching the rail head. The fixing bolt preload must reach 300N·m to prevent movement during transportation. Each car can carry no more than 10 rails, with 100mm×100mm wooden blocks between layers to ensure uniform force. Check rail flatness with a level before transportation; re-adjust if deviation exceeds 2mm.
- How to prevent surface rust of national standard rails during transportation?
Before loading, remove moisture and impurities from the rail surface; wrap the rail head with anti-rust paper and seal with tape. When transporting in coastal areas, spray a thin layer of anti-rust oil (viscosity ≥100cSt at 40℃) on the rail surface, which must be removed within 48 hours after arrival. Cover with waterproof canvas in rainy weather, leaving a 10cm gap between canvas and rails for ventilation to prevent condensation. For transportation over 72 hours, check the anti-rust layer midway and touch up damaged areas promptly.
- What are the differences in loading and stacking requirements for different specifications of national standard rails?
60kg/m rails can be stacked no more than 3 layers, while 50kg/m can be stacked 4 layers-due to the former's greater weight (≈1.5 tons for 25m), the center of gravity must be lower. Spacers between layers must be aligned with deviation ≤50mm to avoid rail bending. When loading 60kg/m rails, the load distribution on flatcars must be uniform, with at least 2 supporting points under each rail, spaced ≤6 meters. 50kg/m rails can be stacked in a "zigzag" pattern to save space but require additional lateral fixing.
- What special fixing measures are needed for road transportation of national standard rails?
Low-bed trailers must be used for road transport; the rail overhang beyond the vehicle body must not exceed 3 meters, with warning lights at the ends. Each rail end is fixed to the trailer guardrail with special chains, tensioned to prevent vertical shaking. When turning radius ≤50 meters, speed must be ≤20km/h to avoid rail displacement due to centrifugal force. Stop every 2 hours to check fixing status, especially clamp tightness at joints.
- How to inspect national standard rails for damage after transportation?
After unloading, first check the rail surface; measure scratch depth with a feeler gauge-those over 0.3mm need grinding. Check straightness with a 10-meter ruler; re-straighten if deviation exceeds 1mm per meter. Rail head and bottom edges must have no curling; check perpendicularity with a square-deviation over 0.5mm is unqualified. Damaged rails must be marked and isolated; assess usability, with severe cases returned to the factory for repair.