Analysis and surveying of construction control network for the north bridge of Runyang bridge

Three design schemes of the construction control network for north bridge of Runyang bridge are proposed in the paper.By comparing and analysing the results computed with surveying data,the design of three schemes is proved to be accurate.The practice of the project indicates that the sur-veying method of trilateration network or triangulateration network for large-sized bridge can fulfil the accuracy requirements for construction control network.The post-test method of determining weight is suitable for triangulateration network adjustment.In the triangulateration network adjustment with precise distance measurement,increasing the number of direction observation can't effectively improve the accuracy of control network.