据统计,小半径曲线区段上钢轨单根抽换数目明显大于平缓曲线区段。前苏联正线上共有总长工520km的半径小于350m的曲线。80年代全苏铁道运输研究院对半径300～349m的曲线上铺设无缝线路的可能性进行了综合研究。在外高加索一些货运不繁忙、钢轨年温度变化不大的条件下进行了轨道结构的试验。结 According to statistics, the number of single-root pumping on the small radius curve section is obviously larger than that of the gentle curve section. The former Soviet Union has a total length of 520km on the main line of a radius of less than 350m curve. In the 1980s, the All-China Railway Transport Research Institute conducted a comprehensive study on the possibility of laying a seamless line on a curve with a radius of 300 to 349 m. In the Caucasus some freight is not busy, rail little change in temperature under the conditions of the track structure test. Knot