The influence of the connection accuracy of the fishplate on the track smoothness
- What aspects does the connection accuracy of fishplates mainly include?
It includes the fitting accuracy of the connection surface between the fishplate and the rail, with a required gap of no more than 0.5mm, otherwise stress concentration will occur. The centering accuracy of the bolt holes is also crucial, with a deviation controlled within ±0.3mm to ensure smooth installation of bolts and uniform stress. The vertical and horizontal accuracy of the fishplate after installation is equally important, with a vertical deviation of no more than 1mm and a horizontal deviation within 1mm/m to ensure track smoothness.
- What impact will insufficient connection accuracy have on track smoothness?
Insufficient fitting accuracy will cause 颠簸 when the train passes, increase the impact between the wheels and the rail, and lead to accelerated wear of track components. A large centering deviation of bolt holes will make the bolts 受力 uneven and easy to loosen, resulting in changes in rail gaps and affecting track geometric dimensions. Failure to meet the vertical and horizontal accuracy standards will cause vibration and shaking during train operation, reduce passenger comfort, and even endanger driving safety in severe cases.
- How to improve the connection accuracy of fishplates?
Before installation, grind the connection surfaces of the rail and fishplate to remove uneven parts. Use positioning tools to ensure the bolt holes are centered. During installation, use feeler gauges to check the fitting gap and adjust in a timely manner if it does not meet the requirements. After installation, use a track measuring instrument to measure the vertical and horizontal levels of the track at the fishplate. When the deviation exceeds the limit, correct it by adjusting gaskets and other methods.
- What impact does fishplate connection accuracy have on train operating speed?
When the connection accuracy is high, the train can run smoothly at the designed speed. When the connection accuracy is insufficient, the train operating speed must be appropriately reduced; otherwise, excessive vibration and impact will damage track components and even cause accidents such as derailment. On high-speed railways, higher requirements are placed on fishplate connection accuracy to meet the smoothness needs of high-speed train operation.
- What are the methods for regularly checking fishplate connection accuracy?
Visually check whether there are gaps on the connection surfaces and whether the bolts are loose. Use feeler gauges to measure the connection surface gap. Regularly use a track geometric dimension measuring instrument to detect the vertical, horizontal and gauge of the track at the fishplate. For fishplates in key parts, non-destructive testing technologies such as ultrasonic flaw detection can be used to check whether there are internal defects affecting connection accuracy.