Practice and analysis of quasi-geoid refinement in ultra-large sea-crossing bridge project
The application practice of quasi-geoid refinement in ultra-large cross-sea bridge projects is very rare.In order to solve the difficult problems of high-precision positioning and lofting for offshore construction under complex sea conditions such as high wind and waves and long distance,this paper carries out high-precision quasi-geoid precision for an ultra-large cross-sea bridge project.Based on basic data such as terrain and gravity data and advanced theoretical models,the second type of Helmert aggregation method,which is widely used,is used to calculate the quasi-geoid model.Through practice verification,the accuracy of the quasi-geoid model is±0.008 m,and the average accuracy of the applied measurement is±0.0118 m,which meets the design accuracy requirements.At the same time,by implanting the grid model into the engineering continuously operating reference station(CORS)system established for the bridge construction,it is convenient to use the network real-time kinematic positioning(RTK)in the daily construction of the bridge to achieve high-precision construction lofting,improve work efficiency,and provide important basic technical support and guarantee for the smooth construction of the bridge.
NETL
NSTL
万方数据
维普
