Study on Influence of Suspension Interval Length on Construction and Closure of Main Girder of Continuous Rigid Frame Bridge

Cantilever pouring construction is a commonly used construction method for continuous rigid frame bridges, but during the construction process, the occurrence of overcasting intervals sometimes occurs. Based on the construction monitoring project of the Bahe Bridge, the finite element software was used to simulate the actual construction process. The measured values of the deflection of the overcast interval were compared with the theoretical values, and the concrete shrinkage and prestressed steel bundles were analyzed. Under the influence of influences on the deflection and stress of different sections of continuous rigid frame bridges with different durations of overcasting. The results show that the variation of the stress of the main beam is small and can be neglected under different conditions of different casting intervals. Different overcasting intervals and different section stoppages have a greater impact on the deflection of the main beam section. In the actual construction, preventive measures should be taken in advance, and the design elevation of the suspended girder section should be adjusted in time to facilitate the construction of the closed section.