摘要
根据现场实测的钢轨长度 ,对钢轨的蠕变伸长进行了分析。得出新钢轨上道后的不同时期 ,其蠕变伸长速率是不同的。新钢轨上道后的前期 ,蠕变伸长速率较大 ,以后逐步降低。钢轨的蠕变伸长可使无缝线路的锁定轨温下降 ,最大下降值可达 1 5℃左右。建议在新钢轨上道后的半年内 ,对钢轨进行应力放散 ,以保持无缝线路的稳定性。
According to the data measured from field, this paper analyses the creep lengthening of rail. The rate of rail creep lengthening is not the same at the different time after the new rail laying on the track. The rate of rail creep lengthening at the beginning after rail laying on the track is greater than that of the afterward time. With the time going on, the rate of rail creep lengthening descends greatly. Rail creep lengthening can descend the maximums tress-free temperature about 15℃, so this paper suggests that we should free the temperature force in the rail after a short time of the new rail laying on the track, in order to keep the stability of the continuously welded rail.
基金
铁道部铁路科技研究开发计划项目! (J93G0 50 )
