Necessity and Method for Monitoring of Box Girder Deformation in Construction of Long-Span Continuous Rigid Frame Bridges

With reference to the construction control of 270m and 190m continuous rigid frame spans of Humen Bridge and Zhenhaiwan Bridge, this paper presents the analysis of the causes of deflection deformation of box girders in construction of longspan continuous rigid frame bridges, necessity, methods, accuracy, some effective measures and results of the monitoring. The successful closure of the two bridges with high accuracy proves that the method for monitoring of the girder deformation is effective. The experiences of the bridges can be of reference to the construction of other similar kind of longspan bridges.