Control Surveying and Structural Health Monitoring Applied in Large Bridge

In order to ensure the safety of the bridge, Control surveying and monitoring was applied in many ways. This paper introduces the surveying and monitoring methods, analyzes the surveying accuracy, discuses the effective measures. In case study, Trimble 5700 GPS, TPS，Levels were used to perform the control surveying, and video camera, camera, georobot, three-dimensional laser scanner and other graph or image sensors were used to monitor bridge deformation. The research shows that the relative error of the control network baseline is smaller than 10-6 and the elevation accuracy is satisfied with the standard. The control survey enabled all surveying, mapping and monitoring activities to share a common geodetic reference system，provided a reliable support for the monitoring of the piers，box girders，coastal topographic details as well as hydrographic activities. And the application of modern sensors and the data acquisition technology reflected the real-time deformation conditions of bridge and provided forecasting and alarming information at any time by ways of number, curves, graph and image with high efficiency.