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ID:52221534
大小:3.06 MB
页数:6页
时间:2020-03-25
《石首长江公路大桥主桥总体设计.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2017年第47卷第5期(总第246期)BridgeConstruction,V01.47,No.5,2017(TotallyNo.246)文章编号:1003--4722(2017)05—0006—06石首长江公路大桥主桥总体设计陈虎成1,张家元2,刘明虎1,丁望星2,沈昊1(1.中交公路规划设计院有限公司,北京100088;2.湖北省交通规划设计院股份有限公司,湖北武汉430051)摘要:石首长江公路大桥主桥为(75+75+75)m+820m+(300+100)m的单侧混合梁斜拉桥,半飘浮结构体系。主梁采用钢箱梁与预应力混凝土梁组成的
2、混合梁,分离式双箱断面,全宽38.5m。钢箱梁顶板横桥向变厚,设实腹式横隔板;预应力混凝土梁采用短线法预制;钢一混结合段采用带钢格室的部分连接填充活性粉末混凝土构造。南、北桥塔高分别为234m、232m,基础均采用直径2.5m的群桩基础,由于地质条件差,桩端采用后压浆技术提高承载力。索一塔锚固采用钢锚梁方案,钢牛腿壁板与塔壁结合采用开孔板连接件。斜拉索采用标准强度1770MPa的平行钢丝,外置式阻尼器采用杠杆质量减振器LMD。关键词:斜拉桥;公路桥;半飘浮结构体系;混合梁;钢箱梁;桥塔;斜拉索;桥梁设计中图分类号:U448.27;U442.5文
3、献标志码:AOverallDesignofMainBridgeofShishouChangjiangRiverHighwayBridgeCHENHu—cheng1,ZHANGJia—yuan2,LIUMing—hu1DINGWang—xing2,SHENHao1(1.CCCCHighwayConsultantsCo.,Ltd.,Beijing100088,China:2.HubeiTransportPlanningandDesignInstituteCo.,Ltd.,Wuhan430051。China)Abstract:Themainbridg
4、eofShishouChangjiangRiverHighwayBridgeisanone—sidehybridgirdercable—stayedbridgewithspanarrangement(75+75+75)m+820m+(300+100)mandisdesignedintotheoneofthesemi—floatingstructuralsystem.Themaingirderofthebridgeisthehybridgirdercomprisedofthesteelboxgirderandprestressedconcrete
5、boxgirder.Thecrosssee—tionofthemaingirderiStheseparatedtwinboxesandthefullwidthofthegirderis38.5m.Thetopplateofthesteelboxgirderisthickenedgraduallyinthetransversedirectionofthebridgeandintheboxgirder,thesoliddiaphragmsarearranged.Theprestressedconcreteboxgirderistobecast,us
6、ingtheshortlinematchmethod.Inthejointsectionofthesteelandconcreteboxgirders,thestructureofthesteelcellsthataretobepartiallyconnectedbyfillingthereactivepowdercon—creteisprovided.Theheightofsouthandnorthpylonsisrespectively234mand232m.Thefoun—dationsforthepylonsarethegrouppil
7、esofdiameter2.5mandbecauseofthepoorgeologiccondi—tionsatthebridgesite,thebearingcapacityofthepilesistobeimprovedbypostgroutingatthebasesofthepiletips.Theanchoragesforthestaycablesinthepylonsarethesteelanchorbeamsandthewallplatesofthesteelcorbelsandpylonwallsintheanchoragezon
8、esareconnected,usingtheperforatedplateconnectors.Forthestaycablesofthebridg
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