Study And Practice On The Control Technology Of Cantilever Construction Of (55+90+55)M Of Continuous Girder Bridge Over South-to-North Water Diversion Project

With the development of The Times, Chinese bridge construction entered a new climax stage,due to the simple form of construction work and reasonable stress, high economic efficiency.It became a very important form of bridge structure, however prestressed concrete continuous girder bridge in the construction of many interference factors,and the construction mode is relatively slow process, due to the influence of various factors,it will be bring some difficult to construction of closure. and lead to the bridge line is disqualification.so we need to construction monitoring for bridge linear smoothing and the rationality of the stress.In this paper the xibaipo highway bridge as the research object. construction before the start, using MIDAS software to do a comprehensive simulation of the construction of the bridge,to get the preliminary throw of level, to solve the construction problems of the line, and collected stress monitoring point theory data, during the construction period, coMParing it with the measured data. Among the construction process, provides the height of the formwork, collect stress data and linear data after the changes completion of each condition. coMPared with the theoretical value, and analyzed, guiding the next stage of construction, and during construction. to T5and WC5the two steel wires as the research object for Friction Test, ensure the accuracy of prestressed tension among construction.during construction, laying the temperature sensor..after concrete pouring,we take temperature monitoring behavior,and use MIDAS software for temperature simulation, it can help us to implementation of temperature data analysis.This article elaborated linear stress, temperature data in the monitoring process, and take those monitoring the measured data and theoretical data comparative analysis. find out the measured and theoretical data error reason. after adjustment, guiding the next stage of construction, and separately described bridge after completion linear and the force of the full bridge after ahe completion of the bridge construction,concluded that,the bridge of nanshuibeidiao is get a smooth linear what meet the design requirements.and the force of bridge is reasonble.can satisfy the design request.