Research On Construction Control Of Long-span Bridge On Mashui River

With the rapid development of China's traffic more and more long-span bridges are needed to be constructed. The prestressed concrete continuous bridge has been growing up rapidly in recent years with it's unique predominance of handy construction,economical cost, reasonable internal force and comfortable traveling. The longer the span of the bridge, the more difficulties are there in the construction. The bridge construction control is an essential measure and step to ensure that the quality and safety are obtained during bridge construction,also to ensure that the final structural state is in agreement with what the designer requires.And it is necessary to do more research on the construction control technologies for the long-span prestressing concrete bridges.There are two important contents-structure line shape and structure stress in construction monitoring and controlling of bridge of cantilever construction.The paper through analysis and summing-up the development of the long-span prestressed concrete continuous frame bridge and the construction control techniques in our country and abroad to introduce and summarize the characteristics and construction method of the prestressed continuous rigid frame bridge.On the basis of the mashuihe, according to its special character of the construction control of prestressed concrete continuous rigid frame bridge the paper brings forward a reasonable scheme of observation in the course of construction control, and establishes a comprehensive monitoring system. after establishing the analytic model of the bridge,choosing appropriate structure parameters, taking adequate influencing factors into consideration, The construction control of this bridge is realized through construction calculating, monitoring, back coupling and forecasting and the preplanned target is reached at last.The quotation neural network basic principle, introduces the BP neural network in detail the research process, thus in the establishment prestressed concrete continual rigid frame bridge construction control the elevation deviation neural network model, opens operating mode bridge floor actual elevations and the design value and so on the pull back difference according to the construction time pre-stressed, with the BP neural network recognition model parameter, then instructs the pre-arch value the adjustment.With the help of the neural network toolbox of MATLAB program, The paper builds ANN, imports the sample vector, and trains the bridge construction network, thus makes the forecast function in the bridge construction into reality by obtaining a good export. result in the construction control. The results demonstrated that the ANA is efficient, attempts a new method, and has the good application prospectIn the construction process, the temperature has a large influence on the box beam structure , at the aspect of influence about the environmental temperature to the endogenic stress and flexibility of box beam, this article has done a large work and analyzes, and has obtained a certain rule.will be a certain reference or the model significance to the later same type bridge construction.