Connection and adaptation of foreign standard rails and domestic sleepers
- What dimensions need to be adjusted when connecting European standard UIC60 rails with domestic concrete sleepers?
The width of the rail bottom of European standard UIC60 rail is 5mm wider than that of domestic 60kg/m rail. The width of the iron pad on the sleeper needs to be increased by 5mm to ensure that the rail is placed stably. The slope of the side of the rail head is 1:20, and the domestic one is 1:40. It is necessary to replace the adapted buckle plate so that the gap between the buckle plate and the rail head is ≤0.3mm. The position of the bolt hole needs to be offset 3mm to the outside to ensure that the connecting holes of the fishplate and the rail are aligned.
- How to adjust when the rail bottom slope of American standard AREMA rail does not match the domestic sleeper?
The rail bottom slope of American standard rail is mostly 1:40, and the domestic sleeper is 1:20. A wedge-shaped pad with a slope of 1:40 can be installed between the rail and the sleeper to realize the conversion of the rail bottom slope. The thickness of the pad needs to be adjusted according to the height of the rail, usually 8-12mm, to ensure that the top surface of the rail is horizontal. After adjustment, measure with a gauge ruler, the gauge deviation should be controlled within ±1mm, and the height deviation should be ≤0.5mm.
- What are the requirements for the selection of fishplates when connecting foreign standard rails with domestic sleepers?
Special transition fishplates must be selected, with one end adapted to the bolt hole distance and diameter of foreign standard rails, and the other end matched with domestic rails. The thickness of the transition fishplate needs to be 2mm thicker than that of the ordinary fishplate to enhance the connection strength and cope with the stiffness difference of different rails. Its material is 45# steel, which is quenched and tempered, and the hardness reaches HB220-250 to ensure the strength matching with the rails on both sides.
- What special measures need to be taken when connecting foreign standard rails with domestic sleepers in domestic curve sections?
The lateral force of the outer foreign standard rail in the curve section is 20%-30% larger than that in the straight section. The height of the shoulder on the sleeper needs to be increased from 50mm to 60mm to enhance the lateral constraint on the rail. The bolt preload on each sleeper needs to be increased by 10%-15% to prevent the rail from displacement under the action of lateral force. Anti-climbing devices are installed on the inner side of the rail, one set for every 10m, to limit the longitudinal displacement of the rail.
- What are the acceptance criteria for the connection between foreign standard rails and domestic sleepers?
The gap between the rail and the iron pad should be ≤0.5mm to ensure close fit. The gauge deviation is controlled within ±1mm, and the superelevation is set according to regulations in the curve section, with the superelevation deviation ≤3mm. The bolt preload should reach 90%-110% of the design value, and the qualified rate is ≥95% by spot check with a torque wrench. During the trial operation of the train, the vibration acceleration at the joint should be ≤0.3g to ensure reliable connection.