The Study On Control Technology In Construction Of A Continuous Beam Bridge

Constructed all over the world in the past half of century, the prestressed concrete continuous beam bridges are believed to be one of the most important bridge structures. The structures, stress and even loads of the main beam are varied with segmental construction method. The error occurred in each stage involves multiple reasons, therefore it is necessary to measure, calibrate, and amend the construction parameters in each stage. The control technology is one of major parts in bridge construction, and of course the research on the control technology will be attached with more importance.In this paper, the development of continuous girder bridge at home and abroad is compared and the deficiency of construction and control of continuous girder bridge is expounded through the development of construction control technology. Then the theory and method of construction control are introduced, especially the adaptive control method, combined with the corresponding construction methods and detection methods, the main girder line shape, internal force and other key indicators to control.The engineering background of this paper is a three-span continuous beam bridge. Based on the Midas finite element software, the finite element model of the main girder and the main pier is established after assembling the design parameters and construction process information. The pre-camber and stress values of each section of the main beam in each step of construction are obtained through simulation analysis, which is used as the basis for adjusting the elevation of the opposing mold during construction and the pre - judgment basis of stress monitoring.By comparing the measured data with the finite element results, the accuracy of the finite element model and the guidance in the construction process can be proved effectively. The internal forces of the bridge during the construction until the completion of the bridge are within the safe range, the actual height of the main beam are higher than the design elevation, in line with construction requirements and objectives. The conclusion can provide a useful reference for similar bridge construction in the future.