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高速铁路工程测量要求线路坐标系统的投影长度变形值不大于10 mm/km要求,且无砟轨道平顺性要求测量精度高。而铁路是典型的线性工程且线路长,常跨越多个投影带,在工程坐标系带边缘存在变形现象且变形程度不一样;另外不同基准间坐标系转换也是铁路测量中常遇到的问题,坐标系间的衔接问题一直是高铁测量中的难点,本文重点对这两种情况进行了探讨,并结合实例进行了分析,给出了相应的应对措施和建议。
Engineering survey of high-speed railway requires that the projection length deformation value of the line coordinate system should not exceed 10 mm / km, and the ballastless track requires high measurement accuracy. The railway is a typical linear project and the line length, often across multiple projection belt, there is deformation in the edge of the engineering coordinate system and the degree of deformation is not the same; in addition to coordinate conversion between different benchmarks is often encountered in railway measurement problems, coordinates The problem of the connection between the lines has always been a difficult point in the HSR measurement. This article focuses on the two cases discussed, combined with examples of analysis, gives the corresponding measures and recommendations.