Research Of Construction Control Of Long-span Steel Box Continuous Girder Bridge With Large Segment Hosting Construction

Steel box continuous girder bridge has many advantages, such as good torsional stiffness, lateral bending stiffness, it also inherited the advantages of steel structure such as high strength, light weight, great spanning capacity, short construction period and beautiful at the same time, so people pay more attention to it. There are more and more application of construction technology of large segment hosting because it is flexible and efficient. As the growing of the span of steel box continuous girder, the requirement of manufacturing technology, positioning technology, linear control is also improved. Construction is more and more difficult, as well as the construction control of bridge.This article takes hong kong-zhuhai-macao bridge6×110m steel box continuous girder bridge as the background, introduce the construction method of large segment hosting and its difficulty, and drawing up corresponding liner and stress monitoring plan. At the same time, according to the characteristics of the thin-walled steel box girder, this paper expounds the influence of shear deformation in this kind of bridges, and based on the two generalized displacement of deep beam theory, select the calculation method of shear correction factor proposed by Professor Hu Haichang and establish shell element model to verify its correctness.Based on the discussion of shear deformation, this article simulates the construction process of Hong Kong-Zhuhai-Macao Bridge considering the shear deformation and gives the value of deflection and stress of every construction stage. At the same time, the pre-camber is setted according to the result of deformation The details of calculation method about manufacturing linear, installing linear, angle of beam’s ends is given and error correction method is also proposed. The pre-displacement of supports of positioning and its error factors are discussed. Then parameter sensitivity of deflection, stress, angle of beam’s ends is analyzed which includes elastic modulus, density, local temperature difference to providing basis of error analysis of construction control. The actual data is also measured to analyzing the deflection, stress, temperature effect of the structure and compared with the theoretical value. It provides the basis for subsequent construction.This paper provides a theoretical basis for the construction control of the Hong Kong-Zhuhai-Macao Bridge, and gives a reference to the construction control of similar bridge of large segment hosting.