移动式三维激光扫描在轨道交通限界检测中的应用

Application of mobile 3D laser scanning in rail transit limit detection

针对使用传统测量手段获取轨道交通限界效率低的问题,本文首先推导了三维激光扫描的基本原理和点云断面拟合的数学方法,结合实际工程案例通过外业数据获取、内业数据处理得到轨道交通车站和区间限界结果,同时使用徕卡TM60型全站仪对移动式三维激光扫描限界检测结果进行质量检核。结果表明:移动式三维激光扫描获取的限界结果准确可靠,且精度整体优于4 mm,被检测车站共有11道滑动门防踏空胶条侵入车辆限界,但未侵入车辆轮廓线,其中侵入最大值为-18.4 mm;761个区间检测断面未侵界,其中最小间距的最大值为397.9 mm。限界整体检测结果处于安全范围,满足轨道交通安全运营要求。

In view of the low efficiency of traditional measurement methods in obtaining rail transit limits,this paper first derived the basic principle of three-dimensional(3D) laser scanning and the mathematical method of point cloud section fitting,combined the actual engineering cases to obtain rail transit stations and interval limit results through field data acquisition and internal data processing,and used Leica TM60 total station to check the quality of limit results obtained by mobile 3D laser scanning.The results show that the limit results obtained by mobile 3D laser scanning are accurate and reliable,and the overall accuracy is better than 4 mm.Rubber strips for avoiding missed steps of 11 sliding doors in the detected station intrude into the vehicle limit but do not intrude into the vehicle contour.The maximum intrusion is-18.4 mm,and 761 interval detection sections are not intruded,of which the maximum value of the minimum spacing is 397.9 mm.The overall limit detection results are within the safe range,meeting the safe operation of rail transit.