鄂东长江公路大桥设计关键技术.pdf

学兔兔 j4 文章编号：1003—4722(2O1 1)05—0064 05 鄂东长江公路大桥设计关键技术 胡明义，黄冰释，余俊林，唐守峰 (湖北鄂东长江公路大桥有限公司。湖北 黄石 135()02) 摘 要：鄂东长江公路大桥主桥为主跨 926／n的双塔双索面半飘浮体系混合梁斜拉桥．主梁 采用分离式双箱PK断面形式，中跨为钢箱梁，边跨为 PC箱梁，钢一混凝土结合段设于中跨距桥 塔中心 l2．5 Hi处。为使钢结构与混凝土结构平稳过渡，钢一混凝土结合段采用 PBI 剪力连接器 的多格室传力构造。索塔锚固采用在塔柱内置钢锚箱的构造，为控制锚固区混凝土裂缝开展，在锚 固侧混凝土塔壁内设置 l2j5 15．24预应力束。为增强结构耐久性和使用寿命，进行钢筋混凝土 耐 久性及钢结构防腐设计；采用全寿命设计理念，设置桥梁各主要构件检查维护通道，提出构件检查、 维护周期及更换标准、工艺及技术要求。 关键词：鄂东长江公路大桥；斜拉桥；混合梁；结合段；桥梁设计 中图分类号：U448．27；U442．5 文献标志码：A Key Techniq ues for Design of Edong Changj iang River Highway Bridge H U Ming—yi，HUANG Bing—shi。l 【，Jun—lin。TANG Shou—feng (Hubei Edong Changjiang River Highway Bridge Co．，Ltd．，Huangshi 435002，China) Abstract：The main bridge of Edong Changjiang River Highway Bridge is a semi—floating sys tern hybrid girder cable—stayed bridge with double pylons，double cable planes and with a rnaiI1 span 926 m． Fhe main girder of the bridge was designed as the PK (Pasco Kennewick t~ridge) cross section of separated twin boxes，of which the part of the girder for the central span is of t hc steel box girder。the parts of the girder for the side spans are of the prestressed concrete(P(、) box girders and a steel and concrete joint section was set on each side of the central span at a dis tance of 1 2．5 m lO the center of a pylon．To ensure a smooth transition between lhe steel~ln(t concrete structure，the multi—cel1 force transmission structure with PBI shear conneclo r was tlsed for the joint section．The cable—to—pylon anchorage is the steel anchor box structure buih in