| In recent20years, with the rapid development of the large span arch bridge in China, the world’s largest span CFST arch bridge, steel arch bridge and reinforced concrete arch bridge have been constructed. Among them,cable-stayed knotting method that do not contain support system is applied for the vast majority of arch bridges, while the rotation method and the overall enhancement method are adopted by the minority.In addition, catenary arch is commonly used in the design of the large span, while the circular arch is almost utilized in the small span, let alone the application in the180m concrete arch bridge.The research of design and construction technology in a180m arc reinforced concrete arch bridge is carried out,which sets the Guizhou haima bridge as background.The main contents are as follows;①Based on the principle of minimized deviation between the arch axis and the pressure line under the dead load, the reasonable arch-axis coefficient of haima bridge is studied via the optimization method study. The corresponding circular arch axis is calculated by the method of "five-point coincidence", and then compared to the catenary arch on the internal forces and deformation through the finite element program;②Considering the topographical and geological conditions of the haima bridge, the design of the overall cable hoisting and the method the main arch prefabricated are discussed; moreover, the length of the rock anchor is calculated with regard to the cable of rock anchor;③A special program of large span arch bridge construction control is established,which is based on ANSYS APDL language. The pre-lift of segments and the cable force are calculated. The result shows that the proposed method and calculation program are correct, in addition, the arch axis is in good agreement with theoretical one after removing the cable. |
