澄江大桥主桥结构总体设计

Overall Design of the Main Bridge Structure of Chengjiang Bridge

澄江大桥作为即将落成的跨江建筑,承载了交通通道的运输功能,也是赣江乃至整个泰和县景观的一部分。设计选用空间索面自锚式悬索桥方案,通过主桥结构体系比选,选取了最合理的全漂浮体系;通过对主梁钢箱梁、组合梁不同材质下的结构受力分析,钢箱梁受力好,施工速度快,本次采用钢箱梁结构。主桥采用钢筋混凝土异型索塔,顺桥向呈稻谷造型,主墩对比了直径2.0 m和2.2 m两种桩径下群桩基础布置方案,综合基础受力与经济性,确定主墩桩基布置采用16根直径2.2 m群桩基础。

As a soon to be completed cross river building,the Chengjiang Bridge carries the transportation function of transportation channels and is also a part of the landscape of Ganjiang River and even the entire Taihe County.The scheme of self-anchored suspension bridge with spatial cable plane is selected in the design,and the most reasonable full floating system is selected through the comparison of main bridge structural systems;Through the analysis of the structural stress of the main beam steel box beam and composite beam under different materials,it is found that the steel box beam has good stress and fast construction speed.Therefore,the steel box beam structure is adopted for this project.The main bridge adopts reinforced concrete special-shaped cable tower,which is shaped like rice along the bridge direction.The main pier has compared the layout scheme of group pile foundation under the diameter of 2.0m and 2.2 pile diameters.Considering the foundation stress and economy,it is determined that the main pier pile foundation is arranged with 16 group pile foundation with the diameter of 2.2m.