The Construction Control Of Xiaolinghe Bridge In Jinzhou Yunfeinan Street

As the advantages of economic and esthetic, cable-stayed bridge has been one of the most important bridges in long-span. Many unique design cable-stayed bridges come out one after the other, and construction control is the most important problem in these bridges. In this dissertation, taking the engineering background of Xiaolinghe Bridge as example, the studies are emphasized on the three key steps of construction controls in dual-arch cable-stayed bridge. The main investigations consist of the following parts.(1) To introduce and evaluate the construction process, the three-dimensional space finite element model for Xiaolinghe Bridge arch-tower vertical rotation is established to analyze tower arch force and displacement of different angles under different conditions and calculate cable force. The forced state of arch tower should be adequately understood. To analyze the swing phenomenon of inner arch-tower in actual construction process, the phenomenon can be solved.(2) The cable force for flexible cable of cable-stayed bridge is studied in unstressed state control method. According to the actual situation on site, we have an optimized the premier tension proposal and have an analysis for the new one, master the whole install process of the lasso, to be sure the process in a safe and controllable state. Having an error analysis for the original program, and for the deck load appearing during the actual tension process, we do the calculation for whether there have influences on installing cable force.(3) Do research in construction control technology of the off-beam method of long-span cable-stayed bridge. Due to the construction request of long-span off-beam for Xiaolinghe Bridge, we choose sandbox as temporary support, adopting multi-step to off the beam. According to the construction controlling data, such as number of landing steps and the drop-down volume of each step, we apply the calculating method of Equivalent Nonlinear Gap Truss Element, which is optimized on the basis of the premier one. The result shows the force is safe for the entire landing process, which express the calculating process is more simple and practical. As conclude, it is worth to have the gap unit system transferred and to apply the calculating method of Equivalent Nonlinear Gap Truss Element.