Study On Construction Process Key Technology Of Continuous Beam-Arch Composite Bridge

When the bridge construction in addition to consider the current construction technology equipment and the environmental conditions of the factors such as limit outside, also want to consider the bridge structure of construction, the effects of the different construction methods for the construction of the bridge has different effect on different stages. Some of the design of the bridge is the construction process of the internal force redistribution of the produce of the decision, due to the different method of construction, the construction process of the internal force and deformation have become the focus of research, so for continuous beam-arch composite bridge construction phase analysis and study,use the numerical analysis and real time measurement is the result of data to guide the construction is very significant.This article mainly aims at the current research status and the existing problems of big span continuous beam-arch composite bridge, combined with XiBao passenger dedicated line (63.4+136+63.4)m continuous beam-arch composite bridge engineering examples, for continuous beam-arch composite bridge construction key stages of the combination of mechanical properties,The boom of the optimization of the tension and the tension order at the beginning of the tension on the certain calculation.Using the numerical analysis method, according to the actual construction of the bridge construction process to establish the finite element model, and analysis of the bridge construction in the process of the main girder and arch ribs mechanical performance and displacement change, through the calculation result shows that Cross section of bridge’s midspan in highly smaller so to internal force influence is bigger, zhang pulled the boom stage and the second phase of load shop larger changes of internal force of the stage; The initial tension stage and the second phase of load shop arch rib larger changes of internal force of the stage; Because Bridges in construction process exists asymmetry of construction, in order to guarantee the construction safety and bridge stress reasonable, in the bridge across the balance on edge, and through calculation, balance set to meet the size appropriate construction requirements; Due to the arch rib support on the main girder, causing some influence to the main girder, the calculation does not appear girder tensile stress, full of stents construction had a big load, recommended the construction method of stents less for erection, can reduce the main girder deformation and improve the stress; In the arch rib construction stage, arch rib support produce settlement will cause stress arch rib arch feet increase significantly, should strengthen the construction of the linear monitoring, strictly control the arch rib alignment, adjust deviation; In the arch rib construction stage, arch rib support produce settlement will cause stress arch rib arch feet increase significantly, should strengthen the construction of the linear monitoring, strictly control the arch rib alignment, adjust deviation; and Shut the arch rib temperature of different bridge bridge arch rib after force also has a great influence, the calculation in the average temperature (i.e. design fold temperature) can ensure folded arch rib stress in the smaller range change, be helpful for the durability of arch rib into full play; Combined with minimal bending the energy method and the influence of the matrix theory target to optimize the tension, and connecting with the impact of the matrix on the drawing order comparing calculation, the calculation of tension between the symmetrical method can reduce the tension when tension to the influence of the main girder structure.