Analysis On The Re-surveying Techniques Of The Survey Control Network Of Hong Kong-Zhuhai-Macao Bridge Project

The survey control network is an important technical support work in the process of construction,it is used through the beginning to the end of the project construction,it is the critical factor for the success of the project.This paper studied the construction and repetition measurement of the Hong Kong-Zhuhai-Macao Bridge's survey control network,including the technology and the stability of the control points,the reliability of results,the continuity using,and the data acquisition & analysis,to ensure that the survey control network can meet the requirements of providing stable measurement benchmark data and accurate results with the characteristics of long cycle,high precision for the project.The measure control network has been built for the Hong Kong-Zhuhai-Macao Bridge by using the experience of domestic and international major sea-crossing engineering measure control network construction adequately and survey with its characteristics.The comprehensive repetition measurement and comparative analysis has been made many times during the construction,to research the technology of the repetition measurement,analyze the measurement result data,the main research contents are as follows:1)re-checked the original quality of observation and calculation of the measure control network,validated the precision of the measure control network results is required;2)encrypted sea-crossing elevation point through the observation conditions of sea island bridge and tunnel of new measurement platform on the sea,provided high accuracy height datum for the engineering construction in the sea;3)assessed the stability of head control points and measuring platform's heads encryption point in the sea through the measurement results of comparative analysis,and updated the head control network and head encryption net results according to the engineering need;The main research conclusions:On the basis of the Hong Kong-Zhuhai-Macao Bridge project construction control network repetition measurement tasks,the complex measurement environment in the cross-border offshore region,and the measurement which is long distance high precision crossing the sea,data processing and other problems are deeply researched,comparison and analysis method of working principle and data of the project control network retest is made,and the engineering control network and the subsequent 7 retest results are analyzed,meanwhile the reliability stability and measurement results of the control network is checked in this research,in order to meeting the construction project application of long period andhigh precision need.The research results have reference value for the similar comprehensive large cross sea engineering and super large bridge engineering control network retest,etc.