海外铁路工程框架控制网及投影坐标系研究——以阿联酋某铁路为例

Research on Frame Control Network and Projected Coordinate System of Overseas Railway Engineering——Taking the Case of a Railway Project in the UAE as Example

高精度框架控制网是铁路工程建设中平面坐标起算的基础,为解决海外铁路工程中基础测绘资料匮乏、缺少统一的基准等问题,利用AUSPOS及OPUS等在线GNSS数据处理系统进行框架控制网计算,以建立满足平面坐标系统起算的统一基准;为解决测图阶段采用的UTM投影长度变形超限,难以满足施工要求等问题,在详细分析UTM投影长度变形规律的基础上,通过建立基于抵偿任意带高斯投影的工程独立坐标系方法予以消除,以确保设计与施工的一致性,降低施工风险。最后,结合阿联酋某铁路工程的实践,证明了该方法的有效性。

The high-precision frame control network is the foundation of railway engineering construction.In view of the lack of basic surveying and mapping data,and the lack of unified benchmarks encountered in overseas railway projects,GNSS online data processing systems such as AUSPOS and OPUS were used to calculate the frame plane control network,established a unified datum that satisfied the starting point of the plane coordinate system.In order to solve the problem that the length distortion of UTM projection which used in the topographic survey stage exceeded the limitation,and was disabled to meet the construction requirements,by detailed analysis of UTM projection,independent engineering coordinate systems were established to eliminate the distortion.The system was based on Gaussian projection with any central meridian and Compensation projection,which could ensure the consistency of design and construction,reduce the risk of construction.Finally,the effectiveness of the method was proved by a railway project in UAE.