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永胜特大桥为太原至澳门高速公路广东顺德碧江—中山沙溪段的一座特大桥,桥位地处珠江水系下游珠江三角洲河网地区,跨越西江水系下游的小榄水道。主要介绍永胜特大桥的桥型总体布置、主桥上部箱梁构造、三向预应力布置及下部构造设计情况。对该桥的中跨合龙段顶推设计、主墩的防撞设计、箱梁底板的三维受力分析等设计特点进行了概述,并与按“85桥规”设计的刚构桥的相应参数进行了对比分析。
Yongsheng Super Bridge is a special bridge between Bijiang-Zhongshan Shaxi Section of Shunde, Guangdong Province from Taiyuan to Macao Expressway. The bridge is located in the Pearl River Delta region downstream of the Pearl River and across the Xiaolan Channel in the lower reaches of the Xijiang River. This paper mainly introduces the general layout of Yongsheng Bridge, the structure of the upper box girder of the main bridge, the arrangement of three-direction prestress and the design of the lower structure. The design features of this bridge, such as the mid-span closure section thrust design, the anti-collision design of the main pier and the three-dimensional force analysis of the box girder floor, are summarized and compared with those of the rigid frame bridge designed by “85 Bridge Regulation” The corresponding parameters were analyzed.