The Cantilever Method Of Prestressed Concrete Continuous Rigid Frame Bridge Construction Monitoring

In recent years, with improvement of science and technology, the continuous rigid frame bridge has been developed in an increasingly rapid speed. Because of enlargement of the spans the uncertain factors during the construction are increasingly obvious, which puts continuous rigid frame bridges under high risk during construction and measures to handle this must be applied. In this thesis, according to construction of Beiyilu bridge, construction control of continuous rigid frame bridge that applies cast-in-cantilever method has been studied.Cast-in-cantilever method has been applied in bridge construction as a general construction technology, which conquers the topographical imperfection and ensures the staging pouring construction of superstructure, possessing the advantages including lower investment, convenient construction, ideal integrity of the structure, less need of post maintenance and easier maintenance, thus bringing a vast prospect for development of arch bridges in western areas in our country. While with development of bridge construction techniques, traditional cast-in-cantilever method needs increasing improvement in construction and construction control to adapt to development of larger-span bridges. Therefore, it becomes particularly significant to establish a set of reasonable construction-controlling system to ensure the safety, ideal alignment and internal force distribution of large span continuous rigid frame bridge during the procedure of cast-in-cantilever.Through the forward analysis method to establish the construction process of fine simulation; The establishment of a stress and linear monitoring network and system; Based on the measured data, the bridge, the material system of the main parameters for the dynamic identification, then update the existing model, improved the precision of prediction. The measured show that the stress and linear degree is more and more good agreement with theoretical predictions, closed well, they used force to meet the design requirements.