Helmert方差估计在跨江(海)大桥导线测量中的应用  

Application of Helmert Variance Estimation by Surveying Traverse Lines of River (sea)-crossing Bridge

作　　者：李成[1] 刘金平[1] 

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430014

出　　处：《中国港湾建设》2009年第1期53-55,67,共4页China Harbour Engineering

基　　金："十一五"国家科技支撑计划项目(2006BAG04B04)

摘　　要：随着跨江、跨海大桥的修建,导线测量在宽阔水域桥梁施工控制网的加密测量中得到广泛应用。但存在两类不同性质的观测值和导线边长不等的问题,文中结合某大桥施工加密控制测量的实际情况,对跨江(海)导线测量中边长相差较大等问题,采用Helmert方差估计方法,分析平差过程中权的合理取定问题。实践表明:在跨江(海)大桥导线测量平差时采用Helmert方差估计比常规的平差软件精度更高,解决了导线测量中测距边长相差较大,测角精度不高的问题。With plenty constructions of river-crossing or sea-crossing bridges, the traverse network has been applied abroad in denseness survey control during construction of bridge crossing big water area. But due to the two kinds of surveyed value by different characters and the sides of traverse line in different lengths existing, this paper based on the practical denseness survey in one domestic bridge construction to analyze the weight selection during adjustment by helmert variance estimation measure for solving the big difference of side lengths surveyed in traverse network. The practice shows that using Helmert variance estimation method to measure the traverse line of river （sea） -bridge is more accurate than common variance software; it solve the problem of the big difference of side lengths surveyed in traverse network and low metering accuracy of angle.

关 键 词：跨江(海)大桥 导线 测量 定权 Helmert方差估计 

分 类 号：U445[建筑科学—桥梁与隧道工程]