1问题的提出万吨和两万吨列车的开行对道岔破坏十分严重,特别是侧向通过的道岔,几何尺寸变化快,尖轨磨耗严重,辙叉伤损增多。加之日常养护维修不当,道岔病害逐渐产生发展,特别是转辙部分、辙叉部分病害尤为突出,成为日常养护维修的重点和难点,不稳定因素较多,对行车安全检查造成了威胁。 1 PROBLEM QUANTITIES The opening of 10,000-ton and 20,000-tonned trains severely damaged turnouts. In particular, turnouts that pass laterally have rapidly changing geometrical dimensions, severe rail wear, and increased frog damage. Coupled with the daily maintenance and improper maintenance, turnout disease gradually developed, especially the switch part of the frog part of the disease is particularly prominent, become the daily maintenance and repair of the key and difficult, more unstable factors, traffic safety inspection poses a threat.