高铁运维阶段CPⅢ平面网复测方法研究与应用

Research and Application of CPⅢ Plane Network Repetition Surveying Technique for High-speed Railway at Operating and Maintenance Stage

CPⅢ轨道控制网是高铁运维阶段轨道系统静态检查的控制基准,需要定期进行必要的复测,且复测工作仅能在夜间4 h天窗维修时间内进行。为此,提出了通过对相邻CPⅢ点位之间组成的纵横向弦长的变化进行CPⅢ网复测的新方法,推导出了纵横向弦长较差及其限差的计算模型,通过模拟计算确定了CPⅢ网复测的横向和纵向弦长较差限差的建议值分别为±1 mm和±2 mm,并据此进行了复测点位稳定性判定的试验验证。理论分析和试验结果表明,该方法是正确可行的,研究成果对CPⅢ网的复测及相关测量规范的制定和完善有参考价值。

The CPⅢ track control network,which acts as the control datum of railway track check and adjustment for high-speed railway at operating and maintenance stage,requires repetition surveying regularly at only four hours of maintenance window every night.A new method of CPⅢ repetition surveying that is designed to investigate the change of longitudinal and lateral chord composed of adjacent CPⅢ points is proposed in this paper,and also computational model with respect to the difference of longitudinal and lateral chord as well as their limit errors is deduced,then the recommended values ±1 mm and ±2 mm for limit errors of lateral and longitudinal chord are determined by analog calculation and finally an experiment is conducted to prove its correctness and effectiveness.Theoretical analysis and testing results both validate that the method is correct and feasible and the research also provides a reference for formulation and revision of the specifications for CPⅢ repeat surveying and related measurement.