鄂东长江公路大桥设计关键技术

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1、j4文章编号：1003—4722(2O11)05—006405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l2．5Hi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

2、裂缝开展，在锚固侧混凝土塔壁内设置l2j515．24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：AKeyTechniquesforDesignofEdongChangjiangRiverHighwayBridgeHUMing—yi，HUANGBing—shi。l

3、【，Jun—lin。TANGShou—feng(HubeiEdongChangjiangRiverHighwayBridgeCo．，Ltd．，Huangshi435002，China)Abstract：ThemainbridgeofEdongChangjiangRiverHighwayBridgeisasemi—floatingsysternhybridgirdercable—stayedbridgewithdoublepylons，doublecableplanesandwitharnaiI1spa

4、n926m．FhemaingirderofthebridgewasdesignedasthePK(PascoKennewickt~ridge)crosssectionofseparatedtwinboxes，ofwhichthepartofthegirderforthecentralspanisofthcsteelboxgirder。thepartsofthegirderforthesidespansareoftheprestressedconcrete(P(、)boxgirdersandasteel

5、andconcretejointsectionwassetoneachsideofthecentralspanatadistanceof12．5mlOthecenterofapylon．Toensureasmoothtransitionbetweenlhesteel~ln(tconcretestructure，themulti—cel1forcetransmissionstructurewithPBIshearconneclorwastlsedforthejointsection．Thecable—t

6、o—pylonanchorageisthesteelanchorboxstructurebuihinthecolumnofapylon．Tocontrolthedevelopmentofconcretecracksintheanchoragezoneinthepylon，theprestressingstrandsof1215．24weresetintheconcretepylonwallonthesideoftheanchorage．T0enhancethestructuraldurabilitya

7、ndservicelife，thedurabilityofreinforcedCOI)creteandcorrosionprotectionofsteelstructureweredesignedandthelifecyclecostconceptwasapplidetOthedesign．Theinspectionandmaintenanceaccessesforallprincipalcomponentsof{hebridgewereprovidedandtheinspectionandmaint

8、enancecycles，replacementcriteria，workmarlshipandtechnicaIrequirementSwereformulatedaswel1．Keywords：EdongChangjiangRiverHighwayBridge；cable—stayedbridge；hybridgirder：jois51section；bridgedesign收稿日期：2Ol0¨lfJ作者简介：胡明义(1939⋯)．男，教授级高工，1