设置疏散平台的市域(郊)铁路高架区间线路设计标准研究

Research on design standards for elevated sections of urban region(suburban)railways with evacuation platforms

鉴于现行市域(郊)铁路相关设计规范中未对设置疏散平台的高架区间线路设计标准做出明确规定,文章首先阐述市域(郊)铁路高架区间直线地段最小线间距、曲线加宽量计算及同心圆设计的理论方法。然后将理论计算与实际应用相结合,得出设置疏散平台情况下各市域车型所对应的直线地段最小线间距标准,即市域A型车4600mm,B型车4400mm,C型车4800mm,D型车4900mm。最后,在此基础上,建议当线路采用市域B型车且曲线半径不大于500m,或者采用市域A型、C型和D型车且曲线半径不大于900m时,考虑曲线加宽,并给出曲线加宽和同心圆设计的相关参数标准;反之,则建议不考虑曲线加宽,并提出一种类同心圆设计方法以进一步简化线路设计。

As the current design specifications for urban region(suburban)railways do not explicitly specify the design standards for elevated section lines with evacuation platforms,the article first elaborates on the theoretical methods for calculating the minimum midway between tracks for straight sections,structural clearance widening for curve sections,and concentric circle design theory in straight sections of urban region(suburban)railways elevated sections.Then,the minimum midway between tracks for straight sections standards with evacuation platforms corresponding to each vehicle-type are obtained by combining theoretical calculations with practical applications.It is recommended to use 4600 mm for A-type vehicles,4400 mm for B-type vehicles,4800 mm for C-type vehicles,and 4900mm for D-type vehicles in the city.Finally,on this basis,it is recommended to consider platform structural clearance widening for curve sections and provide relevant parameter standards given by concentric circle design for structural clearance widening for curve sections of no more than 500 meters when using urban B-type vehicles with a curve radius,or when using urban A-type,C-type,and D-type vehicles with a curve radius R of no more than 900 meters;On the contrary,it is recommended not to consider platform structural clearance widening and propose another type of concentric circles design method to further simplify the line design for instead.