Concrete-Filled Steel Tubular Tied Arch Bridge Construction Control

Since China’s Reform and Opening Up, with the rapid development of social economy, the scale of bridges constructed are getting larger. More and more bridges which are with wide span, highly difficult and complex are being planned and built. During the construction process of those large and complex bridges, due to the variability of their architectural structures, in order to construct the bridge safely, achieve the goal of the design and improve the quality of the construction, it’s necessary for a professional entity to clarify all the construcion drawings (to the construction contractor), to participate in monitoring and error controling from the very beginning of the construction, to achieve the internal forces of completed bridges and ideal bridge linear.Tied Arch Bridge is thrust-free arch bridge, which is externally statically determinated and internally higher order statically indeterminated, its feasible internal force state as well as the ideal geometry linear is not only determined by the design, but also counts on feasible and scientific construction methods. The key issue in the construction of Tied Arch Bridge is how to set up a feasible construction sequence, how to adjust the tension of the binding rods and hanger rods, how to adjust the elevation of tie beams, to meet the design requirements about the geometry linear and stress of a completed bridge. Although the designers have considered those problems that may arise during the construction, but due to the complexity of the construction process, during the construction, there are a variety of factors that are likely to cause the change of the geometry of the structure and its internal forces.This project is located in Yiwu City, Zhejiang Province. Based on the Yiwu Wuzhou Avenue tied arch overpass bridge, this article describes the research and application methods for construction control and the actual results. By scientifically estimating and controlling on those main factors which may affect the linear and internal forces of the bridge during the construction phase, the construction control group helped achieve reasonable forces on the bridge arch ribs and tie beams, the linear of the axis of the arch ribs and tie beams are consistent with the design.In this thesis, the above project is selected as the object of this empirical research. Based on the theories and methods of bridge construction control, with the application of relating construction control measures. The results show that:the structure linear actually formed are consistent with the design; the maximum difference is less than2cm; the main arch ribs and tie beams completed are in state of compression, and the compressive stress are within the allowable range of specifications. The difference between the stress measured and the theoretical calculations were mainly caused by environmental factors during the measurement; except the axis force error for short booms around the arch foot which was caused by measuring error, all other booms’axial forces measured values are almost the same with the theoretical analysis on the structure, the difference is less than12.5%.Some domestic experts have presented their theory on long-span arch bridge construction control and engineering application results, and this thesis also made some studies and discussions on the research and application of construction control on concrete-filled steel tubular (CFST) tied arch bridge, the results could be reference for further research.