The Research Of Construction Control Of Long Multi-Span Continuous Beam Bridge

With its good mechanical behavior and easily maintenance, continuousbeam bridges have become the preferred type of middle and large-spaned bridges. And with the incessant development of the construction technique and equipment, the prestressed concrete continuous beam bridges develop unprecedentedly. At present the span of the continuous beam bridges are not limited into 3~5 spans one continuous unit and 400 meters. The continous bridges tend toward long multi-spanned ones to exert its predominance betterly.During the construction of the continuous beam bridges,the internal force and deformation will change as the main beam extends and the system transforms because of clouser construction and removing the temporary consolidation, and moreover some uncertain fator such as temporary load, the change of temperature affect the internal force and deformation of the structure. So we must take action to forecast the internal force and deformation to accord the quality and the line-shape of the completed bridge with the designed.Firstly, the paper discusses the meaning, the actuality of the development and existing problem, anlyses the content ant the method of the struction control of the long multi-spanned prestressed concrete continuous beam bridges, and introduces the course to build a GM(1,1) Model, error source and criterion of examining precision.Secondly, the structural model of the Danjiangkou construction bridge for movint water from the south to the north is builded to simulate the construction course of the bridge. and also the GM(1,1) Model of the bridge is set up. The GM(1,1) Model is modified to improve the forcasting precision. And it calculates and forcasts the deformation of the boxed girder, and the result is satisfied.The research indicates that the grey system theory could be use for construction control of the long multi-spanned prestressed concrete continuous beam bridges.