巴基斯坦拉合尔地铁控制网的优化与升级

Optimization and Upgrade of Control Network of Lahore Metro in Pakistan

结合巴基斯坦拉合尔地铁项目,介绍了巴方布设控制网的现状,针对既有控制网存在的问题,对既有控制网的布设及测量进行了优化与升级,以满足线上轨道施工的要求,并阐述利用GNSS接收机与数字水准仪施测过程及数据处理流程,确定了GNSS与水准测量数据处理方案,优化后的控制网既兼容既有控制网又提高了精度,目前已应用于地铁轨道施工并取得了良好的效果,最后提出了地铁项目控制网测量的几点建议。

According to the project of Lahore metro in Pakistan,this paper introduces the present situation of control network.Aiming at the existing problems of control network,the layout and survey of existing control network are optimized and upgraded for meeting the requirements of online track construction.This paper describes the process of survey and processing data by using GNSS receiver and digital leveling,and determines the GNSS and the processing scheme of leveling data.Optimized control network is compatible with the existing control network and improves the accuracy,which has been applied to the metro track construction and has achieved good results.In the end,some useful conclusions and suggestions are given about the city metro control network survey.