Study Of Geometric Control In Construction Of Large-Span Continuous Beam Arch Bridge

With the development of railway undertaking, the train speed was increasing, which promoted the appearance of long-span, light, flexible bridges. The structure of large span railway bridge is higher demands. The bridge that is made of only by single beam, arch is no longer meeting the requirements of large span and outward appearance. The study of its geometric linear form in construction and the stress of large span arch-beam bridge is becoming more and more important.The development of construction process of composite bridge is reviewed, and the control method and control theory of it during every construction step is expressed in this thesis. The FEM, the way how to build a simulation model and the way to monitor and control the beam, the arch, the boom during construction is also introduced. The way to monitor and control the liner of beam and the stress of it in detail is introduced in this thesis, so does the lifting process of the main arch and the boom. For so many ways such as the monitor of arch and frame, retention of the boom etc., the linear form of the beam and the arch meets well with the calculation model. The results of calculation and monitor is compared in this thesis. For the contrast, these two results can check each other, which can guide the further construction step.The general way of geometric control of large span arch-beam bridge is gived out in this thesis. According to the construction of " first beam after arch ", the whole bridge’s stress and linear form is monitored and compared to the calculation results, thus, the whole bridge is well controlled. All these have been done may provide certain theoretical basis for the similar bridges during design and construction.