无砟轨道精调中CPⅢ网点稳定性检测方法的研究

Research on the Detection Method of CPⅢ Points Stability in Fine Adjustment of Ballastless Track

研究目的:无砟轨道施工控制测量技术,特别是其中的无砟轨道精调已成为无砟轨道建设的关键技术之一。无砟轨道精调时,在进行后方交会点的三维平差之前,需对参与后方交会的CPⅢ网点的稳定性进行检测,剔除点位发生变动的CPⅢ网点。如何进行CPⅢ网点的稳定性检测,研究CPⅢ网点的稳定性判断方法及其可行性并制定合理的判断标准,对确保无砟轨道的高精度铺设很有必要。研究结论:提出了利用前期CPⅢ平面和高程控制网平差后提供的资料,和无砟轨道精调时由全站仪自由设站实测数据计算的每2个CPⅢ网点间的实测距离和实测高差,与已知距离和已知高差比较,进行CPⅢ网点稳定性检测的方法,理论分析与试验结果证明,该方法是正确的和可行的,可在工程中推广应用。

Research purposes： Fine adjustment of ballastless track has become one of the key technologies in control survey for ballastless track construction. In fine adjustment of ballastless track, the stability of CP Ⅲ points which are involved in resection should be detected before three - dimensional strict adjustment of the resection station, and then remove the unstable cPm points. How to detect the stability of CP Ⅲ points and analyze the stability judgement method of cPm points as well as its feasibility, and also put forward some suitable judgement standards, so as to make sure the high precision of ballastless track laying. Research conclusions：The paper proposes the method about the stability detection of Control Points Ⅲ, which uses the information provided after the early cPm plane and elevation control network adjustment and the measured distance and height difference of every two CP Ⅲ points calculated by measured data of free station in fine adjustment of ballastless track, and then compares with known distance and height difference. Theoretical analysis and testing results both validate that the method is correct and can detect the stability of CP Ⅲ points in plane and elevation. So the method proposed in the paper can be widely used in the project.