1前言本公司线路正线的35％是半径850米以下的曲线，目前直线以及半径600米以上的曲线已全部铺设无缝线路，曲线半径600米以下部分，由于使用的热处理钢轨过去焊接存在问题而设置无轨维接头并在曲线两端设置伸缩接头，作为与无缝线路相同轨道结构实行维修管理．最近热处理钢轨 1 Introduction The 35% of the main line of the Company is a curve with a radius of 850m or less. At present, all the straight lines and the curves with a radius of more than 600m have been laid with seamless lines. The curve radius of 600m or less is due to the past welding of the heat- Problem Set the dimensionless joints and the expansion joints at both ends of the curve, as seamless lines with the same track structure maintenance management. Recently heat treated rail