湘西矮寨大桥设计创新技术  

Innovative Techniques of Design of Aizhai Bridge in West Hunan

作　　者：胡建华[1,2] 崔剑峰[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《桥梁建设》2011年第6期54-61,共8页Bridge Construction

基　　金：国家西部交通建设科技项目(200631879846);湖南省交通厅科技项目(200517)

摘　　要：湘西矮寨大桥为塔梁分离式单跨钢桁梁悬索桥,主缆跨径布置为242m+1 176m+116m,加劲梁长度为1 000.5m。该桥设计时结合特殊的地形、地质条件,首次提出了塔梁分离式悬索桥新结构,实现了结构与环境的完美融合。采用在主缆无吊索区增设竖向岩锚吊索的方式解决了无索区过长造成的结构问题。采用高性能复合材料CFRP作为锚杆、超高性能混凝土RPC作为锚杆两端的粘结介质,形成一种高效、耐久的新型岩锚体系。针对山区大跨度悬索桥加劲梁运输与架设的难题,提出了柔性轨索滑移法架设加劲梁的新工艺。通过三维数值模拟分析,分析了施工、运营过程中结构体系与山体的稳定性问题,形成了结构与山体系统稳定新技术。The Aizhai Bridge in the West Hunan is a single span steel truss girder suspension bridge with separated towers and girder. The main cable span arrangement of the bridge is 242 m＋1 176 m＋116 m and the length of the stiffening girder is 1 000. 5 m. In the design of the bridge, in view of the special topographic and geologic conditions at the bridge site, a new structure of suspension bridge with separated towers and girder was brought forward for the first time and the perfect mergence of the structure into the environment was achieved. In the areas of the main cables without suspenders, the structural problem caused by the long main cables without suspenders was resolved by way of adding the vertical rock anchored suspenders. The utilization of the high performance composite material, the carbon fiber reinforced polymer （CFRP）, as the anchor rods and the utilization of the high performance concrete, the reactive powder concrete （RPC）, as the binding medium at both ends of the anchor rods resulted in a new type of rock anchor system of high efficiency and durability. In consideration of the difficulties of transportation and erection of the stiffening girder of the long span suspension bridge in the mountainous region, the new construction technology for erection of the stiffening girder by the flexible rail cable launching method was proposed. By means of the three-dimensional numerical simulation, the stability of the structural system and mountain massif in the process of the bridge construction and operation was analyzed and a new technique of stability of the structural system and massif was formed.

关 键 词：悬索桥 塔梁分离 高性能复合材料 地锚 轨索滑移法 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]