30t轴重下朔黄铁路轨道结构强化技术试验研究

Experimental Study on Strengthening Method of Track Structure for 30t Axle Load in Shenchi-Huanghua Railway

本文针对朔黄铁路开行30t轴重货车时既有轨道的适应性与强化措施等问题,进行了系统的理论与试验研究。采用动力仿真分析与30t轴重货车实车试验相结合的方法,分析30t轴重下轨道结构的适应性。朔黄铁路既有轨道结构能满足大轴重货车近期少量开行的要求,但大轴重货车作用于轨道的动态荷载会明显增加,既有轨道结构面临轨道部件伤损增加、疲劳寿命缩短、小半径曲线稳定性储备不足等问题。根据30t轴重下轨道结构荷载特点,有针对性地开展轨道结构强化措施的研究,重点开展SH-Ⅰ型重载轨枕与SH-Ⅰ型重载扣件、小半径强化措施、75kg/m钢轨移动闪光焊技术、直线钢轨打磨廓面、重载道岔的研发等工作,各强化措施均已在朔黄铁路实施。对朔黄铁路既有轨道结构的强化改造,可全面提升轨道结构等级,能满足30t轴重货车的运营要求。

The feasibility and strengthening measures for the existing track of Shenchi-Huanghua Railway where the trains with the axle load of 30 toperate were studied using theoretical and testing technologies.By applying dynamic simulation analysis in combination with actual test involving a 30 taxle load freight train,the feasibility of the track structure under 30 taxle load was evaluated.The analysis results showed that the existing track structure meets the operating requirements of a small number of trains with heavy axle load over a certain period of time.However,the dynamic loads by heavy axle load freight cars acting on the track increased significantly.The existing track structure faces problems such as increased failures and shortened life of track parts,and insufficient stability reserve of sharp curves.Based on the characteristics of dynamic loads of the track structure induced by trains with the axle load of 30 t,an analysis was performed on the strengthening measures for track structure,focusing on the research of SH-I sleepers,SH-I fasteners,strengthening measures for sharp curves,flash butt welding for 75kg/m rail,and grinding template in tangent track and turnouts.All of the measures have been applied in Shenchi-Huanghua Railroad.The track structure has been improved with the strengthening measures and as a result meets the operation requirements of the trains with axle load of 30 t.