小半径曲线侵入有效站台曲线超高设计研究

Analysis of Superelevation for Small Radius Curves in Platform Areas

在城市轨道交通车辆扩编、站台加长的既有线改造项目中,为克服小半径曲线侵入有效站台较多带来的车辆限速问题,借鉴公路曲线超高的设计思路,提出将曲线超高过渡段设置在缓和曲线局部区段,全超高断面设置在缓圆点或圆缓点处,通过缓和曲线分段顺坡的设计思路,并以北京地铁13号线扩能提升改造工程知春路站车站加长为案例,进行缓和曲线分段顺坡的应用实践。研究结果表明,方案最大限度匹配进出站速度,节省了运营时间。

This study proposes a design concept inspired by highway curve superelevation to address the speed limit issue caused by small-radius curves encroaching on effective platforms in an existing line renovation project of vehicle expansion and platform extension.The design involves setting a super-elevation transition section in local sections of the transition curve,and a full super-elevation section at gentle or circular points.The transition curve is segmented and graded to reduce the impact of small-radius curves on effective platforms.The Zhichun Road Station extension project of the Beijing Metro Line 13 expansion and upgrading project is used as a case study to apply the segmented slope of the transition curve.The results show that the proposed plan increases the maximum speed by 12.4 km/h and saves 6 s of operation time compared to the original plan.The study provides a reference for the design of curve super-elevations in existing line renovation projects when small-radius curves invade effective platforms.