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时间:2019-05-13
《沪通长江大桥公铁合建斜拉桥桥塔基础设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2015年第45卷第3期(总第232期)BridgeConstruction,Vo1.45,No.3,2015(TotallyNo.232)文章编号:1003—4722(2015)03—0007—06沪通长江大桥公铁合建斜拉桥桥塔基础设计徐力,高宗余,梅新咏(中铁大桥勘测设计院集团有限公司,湖北武汉430056)摘要:沪通长江大桥为4线铁路、6车道公路合建桥梁,主航道桥采用跨径布置为(142+462+1092+462十142)m的连续钢桁梁斜拉桥。该桥桥塔基础建设条件复杂,根据桥塔基础特性,
2、从结构受力、经济性、施工便捷等方面对大直径钻孔桩基础和沉井基础方案(圆形沉井、矩形沉井)进行比选,最终推荐采用倒圆角的矩形沉井基础。矩形沉井下段采用钢沉井,上段采用混凝土沉井。28号、29号沉井总高分别为105m、1l5m。标准段井身平面尺寸为86.9mx58.7m(四周倒圆角半径为7.45m),考虑施工便捷,井身竖向分节,标准节段高6m。沉井为平面框架结构,平面布置为24个12.8m×12.8m井孔,封底混凝土厚14m,为确保封底混凝土与井身结构传力,钢沉井底部设置抗剪剪力键。关键词:斜拉桥;公路
3、铁路两用桥;桥塔基础;沉井;方案比选;结构设计中图分类号:U448.27;U443.131文献标志码:ADesignofPylonFoundationsforRail-·cum-RoadCable——StayedBridgeofHutongChangjiangRiverBridgeXULi,GAOZong—yu,MEIXin-yong(ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo.,Ltd.,Wuhan430056,China)Abstrac
4、t:TheHutongChangjiangRiverBridgeisarail—cum—roadbridgetocarry4-trackrail—waysand6-lanehighwaysandthemainshipchannelbridgeofthebridgeisdesignedasacontinu—OUSsteeltrussgirderbridgewithspanarrangement(142+462+1092+462+142)m.Thecon—structionconditionsofthe
5、pylonfoundationsforthebridgearecomplex.Inthelightofthecharac—teristicsofthefoundations,theschemesofthelargediameterboredpilefoundationsandopencais—sonfoundations(circularandrectangular)arecomparedintheaspectsofthestructuralforcecon—ditions,economyandco
6、nstructionconvenienceanditisfinallyrecommendedthattherectanguIaropencaissonswithroundedcornersshouldbeselected.Fortherectangularopencaisson,thelowerpartofacaissonisthesteeIcaissonwhiletheupperpartistheconcreteone.ThetotalheightofthecaissonsNo.28andNo.2
7、9isrespectively105mand115m.Theplandimensionsofthestand—ardsectionofacaissonis86.9m×58.7m(theradiioftheroundedcornersaroundthecaissonbe—ing7.45m).Inconsiderationoftheconstructionconvenience.thecaissonisverticallydividedintoseveralliftsandtheheightofasta
8、ndardliftis6m.Thecaissonisaplanframestructureinwhich24wellholes,eachbeing12.8m×12.8m,arearrangedandthedepthofthehasesealingconcreteofthecaissonis14m.Toensuretheforcetransferbetweenthebasesealingconcreteandcaissonshaft,theshearstudsarear
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