市域铁路60 kg/m钢轨12号可动心轨无砟道岔设计

Design of Ballastless Track Turnout with 60 kg/m Rail No.12 Movable Point Crossing in Suburban Railway

研究目的:市域铁路对城市和区域发展起着重要的支撑和带动作用,多个城市已建或正建。道岔是轨道线路的薄弱环节,是影响列车安全平稳通过的关键因素。为保障高密度运营和减少日常维修,市域铁路轨下基础以无砟轨道为主,但配套的无砟道岔较少,有必要为正线设计60 kg/m钢轨12号可动心轨无砟道岔。研究结论:(1)通过采用复曲线道岔平面线型,提升了列车侧向通行的平顺性;(2)通过优化尖端结构,延长了曲线尖轨服役寿命;(3)通过采用可动心轨辙叉,解决了轮轨噪声扰民问题;(4)通过设置防跳机构,避免了列车高速过岔时尖轨、心轨跳动;(5)通过研究尖轨和辙叉跟端传力机构,保障了岔区无缝线路的实现;(6)通过优化滑床板和护轨垫板结构,增强了钢轨扣压稳定性;(7)通过研发三元乙丙橡胶扣件系统,满足了无砟道床低刚度要求;(8)本文研究成果对铁路科研单位及道岔制造厂家在市域铁路道岔设计研究方面具有参考作用。

Research purposes:Suburban railways play an important role in supporting and driving the development of urban and regional.Many cities have built or are building suburban railways.Turnout is the weakness of track line and the key factor that affects the train passes through safely and smoothly.In order to ensure suburban railways keep high-speed operation and reduce daily maintenance,suburban railways are mainly based on ballastless track,but there are few ballastless track turnouts,it is necessary to design ballastless track turnout with 60 kg/m rail No.12 movable point crossing in main line.Research conclusions:(1)The smoothness of lateral passage of trains is improved by using the type of compound curve line alignment in diverging line.(2)The service life of the curve switch rail has been extended by optimizing the tip structure.(3)Noise disturbance between wheels and rails has been solved by using the movable point crossing.(4)The switch rail and point rail are free from jumping when the train passes the turnout at high speed by setting up the anti-jump mechanisms.(5)The realization of the continuously welded railway in the turnout area is guaranteed,based on the research on the force transmission mechanisms at the end of switch rail and crossing.(6)The clamping stability of the rail is enhanced by optimizing the structure of slide plate and checkrail plate.(7)EPDM rubber fastener system is developed to meet the low stiffness requirement of ballastless track bed.(8)The research results can be used as a reference for railway research institutions and turnout manufacturers in the design and research of suburban railway turnouts.