地铁钢轨非对称打磨技术应用

地铁线路设计受城市环境的影响，小半径曲线在地铁线路中普遍应用，钢轨波磨为小半径曲线主要病害，严重影响行车品质。针对不同的曲线病害状态，结合地铁车辆车轮踏面实际廓形，设计不同的钢轨打磨廓形，且曲线上下股进行非对称性廓形设计和打磨，改善轮轨接触关系，是有效的波磨整治方案。以北京地铁4号线北京南—马家堡区间一条350 m的曲线波磨病害整治为例，简述按该方案进行廓形设计和施工的过程，后期进行连续观测，打磨整治效果显著，能有效改善轮轨接触关系，控制疲劳伤损，延长钢轨使用寿命。

Application and Practice of Asymmetric Rail Grinding Technology in Metro Rails

The design of subway lines is influenced by the urban environment, and small radius curves are widely used in subway lines. Rail wave grinding is the main challenge in a small radius curve, which seriously affects the running quality of subways. According to different curve diseases, rail grinding profiles are designed in combination with the actual profile of a subway vehicle wheel tread, and an asymmetric profile design and grinding are carried out on the upper and lower parts of the curve to improve the contact relationship between the wheel and rail, which is an effective wave grinding treatment scheme. In this paper, a treatment of a 350 m curve wave mill disease in the Beijing nan-Majiapu section of Beijing Metro Line 4 is presented, and the profile design and construction process according to this scheme are briefly described.