斜拉桥预应力体系布置与施工质量控制

由于斜拉桥设计的受力要求,预应力体系在纵、横、竖三向均有布置,锚具使用的种类多、部位多,预应力张拉施工技术复杂、要求高、难度大.以长沙湘江北大桥的施工实例,对其布置体系、施工技术、质量控制及经验进行总结,并提出了施工中应注意的问题和处理方法.

Cable stayed bridge prestress system layout and construction quality control

Because of strength-bearing demands of slanting-pulling bridge design,preparatory bearing strengthsystem should be arranged from longitudinal, horizontal and vertical directions. Anchor can be used in various kinds and there are many parts that need to be fixed. The engineering skill of preparatory-bearing strength is very complicated and difficult with high requirements. The paper takes the work of Northern Bridge of Xiang-jiang River for an example, and concludes its arrangement system, engineering skill, quality control and experience, then points out problems and solutions in engineering.