在铁道线路上,钢轨内部存在着一种随钢轨温度成线性变化的内应力,称为温度应力。当这种温度应力超出线路轨道的容许值时,就会拉断钢轨或涨轨跑道,给行车带来严重危害,而钢轨的温度又随着气温的变化而变化。所以,正确地掌握钢轨温度随气温而变化的规律,对从事线路作业尤其是无缝线路作业的工作人员来说是 In the railway line, there is a kind of internal stress that changes linearly with the temperature of the rail, called temperature stress. When this temperature stress exceeds the allowable value of the line track, it will break the rail or up runway, which will bring serious harm to driving and the temperature of the rail will change with the change of air temperature. Therefore, a correct understanding of the rail temperature with the law of temperature changes, engaged in line operations, especially the seamless line operations staff is