港珠澳大桥超高强度平行钢丝斜拉索设计与技术研究  

Design and Technological Study of Super High Strength Parallel Steel Wire Stay Cables for Hong Kong-Zhuhai-Macao Bridge

作　　者：刘明虎[1] 薛花娟 

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]江苏法尔胜缆索有限公司,江苏江阴214433

出　　处：《桥梁建设》2014年第5期88-93,共6页Bridge Construction

摘　　要：港珠澳大桥青州航道桥和江海直达船航道桥均采用斜拉桥,斜拉索均采用平行钢丝索。为减小索体阻风面积、减轻重量,在国内首次设计采用1 860MPa钢丝斜拉索。为确保斜拉索技术性能并提高其耐久性,对钢丝关键技术参数进行了研究,对锚具材料及构造尺寸进行了理论计算和设计,并试制成品索开展了物理模型试验。结果表明,钢丝抗拉强度不低于1 860MPa;扭转次数不小于12次;在规定条件下疲劳应力幅达410MPa以上;表面采用锌-5%铝合金镀层防腐性能优;试制成品索的锚固、疲劳及水密性性能均满足规范及设计要求,可应用于港珠澳大桥。The Qingzhou Ship Channel Bridge and the River-to-Sea Ship Channel Bridge ot the Hong Kong-Zhuhai-Macao Bridge are the cable-stayed bridges and the stay cables of the two bridge are the parallel steel wire cables. To minimize the wind resistant areas and to reduce the weight of the cables, the 1 860 MPa steel wire stay cables were designed and were used for the bridges for the first time in China. To ensure the technological properties of the cables and im- prove the durability, the critical technological parameters of the steel wires were studied, the ma- terials and structural dimensions of the anchor devices of the cables were theoretically calculated and designed, the trial finished cables were manufactured and the physical model tests for the ca- bles were carried out. The results show that the tensile strength of each wire of the cables is not less than 1 860 MPa and the twisting numbers are not less than 12 times. Under the specified conditions, the fatigue stress amplitude of the wire is up to 410 MPa and the property of the surface corrosion protection of the zinc and 5 % aluminum alloy coating is superior. The anchoring of the trial cables, the fatigue and water tightness properties of the cables can meet the relevant requirements in the codes and design and the cables can be put in use on the bridges.

关 键 词：斜拉桥 平行钢丝斜拉索 锚具 扭转 锚固 疲劳 水密性 试验 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]