摘要
在无砟轨道施工中,为了满足轨道的高直顺性要求,用来控制铺轨的任意三个控制基桩的角度中误差不能大于8″。由于控制基桩的设置方法将直接影响其定位精度,选用一个精度较高的控制基桩设置方法,在一定条件下,可以极大的降低控制网布设的成本,因此,对控制基桩的设置方法进行深入研究是十分必要的。本文在给出完整的精度计算模型基础上,以任意三个控制基桩的角度中误差为设计的精度标准,采用仿真实验的方法,对施工常用的极坐标法和导线法进行比对。实验结果表明,在考虑原始数据误差的情况下,极坐标法难以满足无砟轨道控制基桩的测量精度要求,而采用附合导线法则可以满足控制基桩的测量精度要求。
In the ballastless track construction, the high smooth of track demands that the mean square errors of angle between three control benchmarks should not be larger than 8 seconds. It is essential to do some researches on surveying method for building control benchmarks because the surveying method directly affects orientation precision of control benchmarks and the cost of control net can be reduced by using a high precision surveying method in a certain condition. Based on full precision calculating models of control benchmarks, this paper compares two surveying methods of control benchmarks, polar coordinate method and traverse method, depending on the mean square errors of angle between three control benchmarks through simulated experiments. The experimental results show that, by considering the initial data errors, the polar coordinate method is difficult to meet the demand of high smooth of ballastless track, but the traverse method attached to control nets can do it.
出处
《测绘科学》
CSCD
北大核心
2010年第1期93-94,115,共3页
Science of Surveying and Mapping
关键词
无砟轨道
控制基桩
极坐标法
导线法
ballastless track
control benchmark
polar coordinate method
traverse method
