利用方向自适应投影统一运营铁路坐标系

为满足TB 10601-2009《高速铁路工程测量规范》中控制网设计时边长投影变形值的要求,设计院通常把1条几百公里的高速铁路划分为多个几十公里的工程投影独立坐标系.相邻坐标系之间的搭接段线路设计中线,可采用前、后投影带坐标系的设计参数来推算,由于投影变形导致相邻坐标系推算出的线路设计中线存在横向偏差,轨道精调时若处理...

Unified Operation of Railway Coordinate System by DirectionalAdaptive Projection

In order to meet the requirement of side length projection deformation value of control network design in"TB 10601-2009 Code for Engineering Survey of High-speed Railway",the designer usually divides a high-speed railway of hundreds of kilometers length into several independent coordinate systems of tens of kilometers length for projection.The design parameters of the front and rear projection belt coordinate systems can be used to calculate the design centerline of the overlapping section between adjacent coordinate systems.Because of the projection deformation,the design centerline of the railway line calculated by the adjacent coordinate systems has lateral deviation.If it is not handled properly during the fine adjustment of the track,it will reduce the smoothness of the track and even affect the operation safety of the operating railway.In order to solve the lateral deviation of the centerline in the design of belt changing and overlapping section and improve the efficiency and precision of track fine adjustment,this paper proposes a method of unifying multiple coordinate systems of the operating railway into one coordinate system by using directional adaptive projection and furthermore establishes an accurate line parameter conversion model,which realizes the accurate conversion between the original design parameters and the new design parameters.Through the case study with a practical project,the difference between the line parameters after the coordinate system unification and the original design parameters,being small,will not affect the smoothness of the tracks.Thus the method is feasible.The study results can provide a reference for improving the efficiency of the fine adjustment for operating railways.