摘要
针对跨海长桥GNSS控制网精度要求高、测量难度大、无统一的精度标准等问题,以确保海中桥墩的精确定位为原则,从海中桥墩施工的平面坐标允许偏差出发,采用测量误差影响分析和配置方法,推导跨海长桥首级GNSS平面控制网必要精度的估算公式,即首级GNSS控制点的平面坐标精度不应低于海中桥墩平面坐标允许偏差的0.22倍。据此,进一步推导出最弱点点位精度、最弱边边长精度、跨海长边相对精度和同岸短边相对精度等基本精度指标。最后,通过港珠澳大桥首级GNSS控制网的精度设计和实际精度的统计分析,验证文中设计方法的合理性和可行性。
To solve the problems resulted from high precision,difficult measurement and no uniform precision standard of the GNSS control network for long distance sea-crossing bridges,based on the principle of ensuring the accurate positioning of bridge piers in the sea,the estimation formula of the necessary precision of the first order GNSS control network of the long distance sea-crossing bridge is deduced by using the surveying error analysis and configuration method.The plane coordinate accuracy of the first order GNSS control point should not be lower than 0.22 times of the allowable deviations of the plane coordinates of the bridge piers in the sea.And then the basic precision indexes such as the weakest point position accuracy,the weakest side length accuracy,the long sea-crossing side length relative accuracy and the same shore short side length relative accuracy are further derived.Finally,through the precision design of the first order GNSS control network for Hong Kong-Zhuhai-Macao Bridge and the statistical analysis of the actual precision,the rationality and feasibility of this method are verified.
作者
吴迪军
WU Dijun(China Railway Major Bridge Reconnaissance & Design Institute Co. Ltd., Wuhan 430050, China)
出处
《测绘工程》
CSCD
2021年第6期46-49,55,共5页
Engineering of Surveying and Mapping
关键词
跨海长桥
首级GNSS控制网
精度设计
港珠澳大桥
long distance sea-crossing bridge
first order GNSS control network
accuracy design
Hong Kong-Zhuhai-Macao Bridge
