不同速度等级装配式轨道结构设计及检算

The Design and Check of Assembled Track Structure by Different Speed Grades

为深入研究时速80~250 km轨道交通装配式轨道技术,建立装配式轨道精细化分析模型,对轨道结构参数进行分析,综合考虑列车荷载因素、土建因素、曲线段轨道板矢距调整因素和施工因素对轨道结构参数的影响,并对轨道结构进行选型分析及检算。研究表明:(1)轨道板长度、扣件间距对轨道板受力影响较小,轨道板宽度和厚度增大,轨道板受力减小;(2)3个速度级下,轨道板长度为4.7 m,厚度统一为0.2 m,扣件间距统一为0.6 m;第Ⅰ速度级板宽为2.2 m,第Ⅱ、Ⅲ速度级板宽为2.5 m;(3)轨道板采用预应力结构,在板中开设圆孔限位;(4)装配式轨道采用“二层+回填”方案。检算表明,装配式轨道的强度可满足不同工况的使用需要。

In order to in-depth study the assembled track technology of rail transit with speed range from 80 to 250 km/h, assembled track refine analysis models were built and the related parameters were analyzed. Factors including train load factors, civil construction factors, curve paragraph track slave tension adjustment factors, and construction factors on track structural parameters were comprehensive considered. The results show that:(1) The length of the slab, the distance between the fasteners have less effects on slab force, and the slab force is reduced when the width and thickness of the track plate are increased.(2) The slab length for three speed levels is 4.7 m, and the thickness is unified as 0.2 m, the fastener spacing is suggested as 0.6 m. The class Ⅰ speed grade slab width is proposed as 2.2 m, class Ⅱ and Ⅲ velocity grade are proposed as 2.5 m.(3) The track slab is a prestressed structure, and a circular hole is suggested set in the slab to serve as a stopper.(4) The assembled track is used in two layers and backroom layer. The intensity of the assembly track meets the needs of different working conditions.