应用CPⅣ网进行轨道几何状态测量方法研究

Research on Measurement Methods for Track Geometry with CPIV

研究目的:高速铁路轨道精调前应进行轨道几何状态测量。现行的方法是采用CPⅢ后方交会自由设站进行轨道几何状态测量,再与设计参数进行比较,之后通过精调使轨道的平顺性各项参数满足设计要求。利用轨道基准网相邻点具有较高相对精度和点位永久保存可用于运营维护阶段的特点,本文提出在轨道基准网(CPIV)点上利用强制对中装置设站、后视,配合轨检仪进行轨道几何状态静态检测的新方法,结合工程实际对该方法进行现场试验。研究结论:(1)采用CPIV强制对中设站方法进行板式无砟轨道几何状态静态检测,设站时间短,作业效率显著提高;(2)CPIV强制对中设站方法利用相邻点间的高精度可确保轨道的高平顺性,经现场试验证明,测量成果正确可靠,满足规范要求;(3)应用CPⅣ网进行轨道几何状态测量,统一了轨道板、轨道精调控制基准,平顺性指标较好,值得推广应用;(4)研究成果可应用于高速铁路板式无砟轨道施工和运营维护阶段轨道几何状态静态检测,对相关测量规范的编制和完善具有参考价值。

Research purposes： The track geometry survey should be carried out before the fine adjustment of high - speed railway tracks. The current method is to use the CPIII resection at freely - occupied station for the track geometry measurement and compare the measured data with the designed parameters, and then the fine adjustment is made to make the various parameters of track regularity meeting the design requirements. Based on the features of track reference network （CPIV） that its adjacent points have higher relative accuracy and its control points can be reserved forever for the operation maintenance, this paper presents a new method for the track geometry static inspection by using track gauge along with the force - centering device used for the occupied station and backsight on CPIV points. The trials on site with this method have been carried out in the practices. Research conclusions： （ 1 ） The method of force - centering occupied station on CPIV for the static inspection of track geometry of ballastless slab has the merits of the short setting time and high efficiency. （2） By using the high precision between adjacent points, this method can ensure the high regularity of the track, and the experiments on site prove the measured results are correct and reliable, satisfying the code requirement. （3） The application of the CPIVnetwork for track geometry can unify the control references for the track slab and track fine adjustment, getting better regularity indexes and being worthy of wide application. （4） The research achievement can be applied in the static inspection of track geometry on the stages of construction and operation maintenance, and has the reference value for the code enmpilation and improvement.