斜拉桥换索工程设计探讨

Research on Cable Replacement Design for Cable-Stayed Bridges

拉索作为斜拉桥支承体系中最重要的构件,其耐久性直接影响桥梁的使用寿命,因此,拉索的可更换性尤为重要。笔者通过参与几座斜拉桥换索工程的工程实践,针对换索工程的特殊性,对斜拉桥换索工程设计过程的结构分析、拉索及锚具设计、施工要求、施工监控等方面进行了较为详尽地探讨和总结,认为斜拉桥换索宜遵循等强度、等索力、满足原构造的原则,同时应对锚具防腐防水进行多防线设计。相关结论可供类似工程的设计和施工作参考。

Stay cable is considered as an important component part in support systems of cable-stayed bridges.Durability of stay cables affects its life directly,therefore,the changeability of stay cables is very important.With reference to cable replacement projects of several bridges,structural analysis,design of stay cables and anchor device,construction requirements and construction monitoring techniques involved in cable replacement are discussed and summarized.Research results show that principles like constant strength, constant cable force and original structure demand should be well followed.In the meantime,multi-degree design should be carried out on corrosion prevention and waterproofing of anchor device.Research results may provide some valuable experience for related design and construction.