Studies On Key Technology Of Construction Control In High Speed Railway Continuous Beam Bridge

The three span prestressed concrete continuous box girder bridge structure has the advantages of big stiffness, good entirety, large carrying capacity, strong spanning capacity, etc. This type of bridge is widely used in high speed railway bridge design. Taking the two typical bridge-(40 + 64 + 40) m,(72 + 128 + 128) m, as the engineering background, based on the bridge construction monitoring, this paper deeply studied the change of some parameters in the construction process of the influence of deformation and internal force of bridge structure.First, summarizes the research status and development of high-speed railway at home and abroad of continuous girder bridge construction control theory. Second, established(72 + 128 + 72) m continuous beam space finite element model using Midas Civil 2012, and analyzes the influence degree of the bridge structure deformation for the change of the concrete density, elastic modulus, the friction coefficient, hole deviation coefficient of channe. And analyses the results of the construction process and bridges closed. Finally, combining(40+64+40) m,(72+128+128) m two continuous beam, from concrete shrinkage, creep and prestressing loss analyzes the influence in operational phase displacement of main girder. Studied the influence in operational phase displacement of main girder of different time for closed system conversion timing, different concrete age of loading, different second phase dead load time. The conclusion can provide reference for this type bridge construction and control...