研究目的:CPⅢ轨道控制网是高速铁路运营维护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4h天窗维修时间内进行。现行规范中CPⅢ网的复测方法需要全线复测且必须联测上一级控制点进行分区段测量等特点导致存在复测工作量大、效率低下等问题。发展一种适用于运营维护阶段cpⅢ网复测的新方法并制定合理的点位稳定性判定标准具有非常重要的意义。
研究结论：(1)模拟计算确定CPⅢ网复测的横向和纵向弦长较差限差的建议值分别为1mm和2mm,并据此进行了复测点位稳定性判定的试验验证。判定方法为：当相邻CPIII点间不满足不大于1mm的横向弦长较差限差时,则至少有一点的稳定性欠佳，为进一步判别，需结合这两点与相邻点间的纵向弦长较差是否大于2mm来确定。(2)采用横向和纵向弦长较差的相对变化进行点位稳定性判定与现行规范中的复测方法结论一致,证明该方法是可行的,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。
Research purposes: As the control datum for checking and adjusting the railway track of high-speed railway during the operation and maintenance stages, the CPⅢ track control network needs to be retested regularly within four hours of maintenance window time at night. With the retesting method stipulated in the current code for the CPⅢ , it has to be co-tested with the control points of the higher rank section by section. In this way, there are lots of retesting works to be done and the retesting efficiency is low. So it is very important to develop a retesting method and work out a kind of standard for judging the stability of the control point for retesting the CPⅢ during the operation and maintenance stages of high-speed railway.
Research conclusions: (1) By simulation calculation, the recommended values of the limit error of lateral and longitudinal chord lengths were determined and they were separately 1 mm and 2 mm. With these data, the verified tests were done for judging the stability of the retesting control points. The judging method was as follows: When the limit error of the lateral chord length between the adjacent control points of CPⅢ did not exceed the limit of 1 mm, it showed that at least the stability of one control points was poor. For further confirming the stability, it needed to see whether the limit error between the longitudinal chords lengths of these two control points and their adjacent CPⅢ points exceed the limit of 2 mm or not. (2) The testing results showed that the conclusions obtained by using the method presented in this paper were consistent with that obtained by using the methods stipulated in the current codes, so this method was feasible and the research result could provide the reference to working out and improving the specifications for retesting CPⅢ.
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