杜步大桥放样精度分析

Setting out precision analysis of Dubu Bridge

通过对广东阳山107国道杜步大桥的放样进行研究总结,对放样的精度要求,从路桥设计、施工(使用全站仪施测各级点)和平面控制网布设、放样方法等方面综合分析,论证了±15mm的桥墩中心点位精度的合理性和放样精度能满足规范要求。提出了4种校核测量方法:重复观测法;方位校核法;距离校核法;相互检测法。

Through summarization of the setting out of Dubu Bridge in No. 107 national highway in Yangshan County of Guangdong, a comprehensive analysis is made for the precision requirements of the setting out from the aspects of design and construction of highway and bridge, arrangement of planar control network and setting cutting approaches. Demonstrations are made for the rationality of precision of ± 15mm for center points of piers, and show that it meets the requirements of relevant specification. Finally, four checking approaches for the measurements are presented; repeat measurement, azimuth checking, distance checking and mutual checking.