Construction Control Of Hongfenghu Specially Long Span Bridge

Cabled-stayed bridge is a kind of bridge with long history and cable load-carrying structure. Since Swedish Stromsund Bridge was built in 1956, modern cable-stayed bridge has a history of almost 50 years. It's structure form has always been changing and the crossover capability is becoming larger and larger. After Yunyang Bridge, the first cable-stayed bridge in china, was first built at Sichuan province in 1975, more than 190 cable-stayed bridges have been built in China. The experience on design and construction of this kind bridge are quite rich. Especially the last ten years, the span of cable-stayed bridge is becoming special larger, and the main span is about to top 1000 meters. The future of cable-stayed bridge is very satisfactory.Firstly, the characteristics of construction computation for cable-stayed bridge and the methods of construction control are introduced in this paper. According to the actual characteristics of Hongfeng-Lake Bridge, it is analyzed that the control principle of control stress of main beam and form travelers strictly and the control methods of two times stretch for cable force used in construction control are feasible. Then, the nonlinear analysis in construction computation is done in this paper.A FEM model is established. Based on this model, the analog computation for Hongfeng-Lake Bridge is done with the Creeps program, which can do all kinds of nonlinear analysis. The analog computation put emphasis on the position for best cable-stayed bridge completed status, the simulation computation for anchor span construction and form travelers, the temperature affect in construction. The computation results are also followed. Based on the practical condition of Hong-feng-lake grand bridge, the methods for cable force control, main beam's elevation control, main beam 's stress control and the measures for them are also introduced.Through analyzing the design plan for Hongfeng-Lake bridge, some problems in actual construction are found. In order t o make the construction carry through smoothly, the closure plan has been revised. New construction plan can ensure not only all the construction but the construction quality for closure phase.Lastly, the main beam elevation control table and cable force cable of Hongfeng-Lake grand bridge construction control are offered in this paper. The theoretical data is compared with the actual measurement. Through analyzing the comparisons, some conclusions are drawn.