广佛地铁三等平面控制网维护重测与精度分析

平面控制网是施工测量的基准,地铁工程控制网使用周期长,控制点的稳定性直接影响施工测量和工程建设的质量,因此必须定期维护重测,检验其稳定性和点位精度.结合广佛地铁平面控制网的维护重测实例,对原有52个点组成的地铁施工平面控制网,采用全球卫星定位系统(GPS)新技术,进行维护重测与严密平差计算,着重对该网新、旧坐标和城市之间坐标转换等内容进行精度比较分析与研究.结果表明各项闭合差与精度指标均优于规范规定,可以满足地铁施工要求.

Maintenance and Resurveying of Plane Control Net and Precision Analysis for Guang-fo Subway

This paper aims to introduce maintenance and resurveying of plane control net with precision analysis for Guang-fo subway.Generally speaking,the plane control net is the basis of construction surveying.As the control net is for relative long-term use in the railway sector,and the stability of control points can directly influence construction surveying and products quality,they must be maintained and resurveyed in a regular time period to ensure their stability and accuracy.In this regard,this paper uses it as a case to investigate maintenance and resurveying of plane control net with precision analysis for Guang-fo subway.The original plane control net consists of 52 points,and the new initiative uses the GPS technology in maintenance and resurveying and pays fully attention accuracy and transform.It is concluded that all closed differences and accuracy indexes have merits than regulations,therefore it can satisfy the requirements in railway construction.