摘要
随着现代化建设进程的推进,跨径为几千米甚至十几千米的特大跨海桥梁日益增多,常规的控制网构建方案能否满足如此大尺寸桥梁工程施工的精度要求逐渐引起了建设行业的重视。本文以台州湾跨海大桥为例,在严格遵循测量原则的前提下提出了监测方案,并采用GPS技术及水准测量完成了平面控制测量和高程控制测量。结果表明,二等GPS控制网最弱边为TZQ5-TZQ6,相对精度为1/505000,控制网反算边长与实测边长的绝对误差在5 mm以内,最大相对误差1/140800,二等水准测量每千米水准测量偶然中误差为±0.29 mm,闭合差为0.5 mm,测量精度均满足相关规范的要求。本文所采用的控制网点位布设方法、监测方案及遵循原则等均能为建立特大跨海桥梁高精度控制网提供参考。
With the advancement of the modernization,there are more and more large cross-sea bridges with a span of several kilometers or even more than ten kilometers.Whether the construction scheme of the conventional control network can meet the accuracy requirements of such a large span bridge construction has gradually attracted the attention of the construction industry.Taking Taizhou Bay cross-sea bridge as an example,this paper puts forward the monitoring scheme by strictly following the surveying principle,and completes the plane control survey and elevation control survey by using GPS technology and leveling survey respectively.The results show that the weakest edge of the secondary GPS control network is TZQ5-TZQ6,and the relative accuracy is 1/505000.The absolute error between the back-calculation side length and the measured side length of the control network is within 5 mm,and the maximum relative error is 1/140800.Second level leveling has an accidental median error of±0.29 mm per kilometer,and its closure difference was 0.5 mm.The measurement accuracy meets the requirements of relevant specifications.The control network layout method,monitoring scheme and principles adopted in this paper can provide reference for the establishment of a high accuracy control network of a large sea-crossing bridge.
作者
孙伟
SUN Wei(Ningbo Institute of Oeanography,Ningbo 315040,China)
出处
《测绘与空间地理信息》
2023年第5期135-139,145,共6页
Geomatics & Spatial Information Technology
关键词
特大跨径桥梁
施工控制测量
GPS-水准联合监测技术
large span bridge
construction control survey
GPS-leveling combination monitoring technology
作者简介
孙伟(1985-),男,浙江宁波人,高级工程师,学士,主要从事工程测量与海洋测绘方面的研究工作。
