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ID:52219454
大小:2.48 MB
页数:5页
时间:2020-03-25
《武汉青山长江公路大桥南主墩锁口钢管桩围堰设计.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1期(总第242期)BridgeConstruction,V01.47,No.1,2017(TotallyNo.242)99文章编号:1003—4722(2017)01一0099—05武汉青山长江公路大桥南主墩锁口钢管桩围堰设计王寅峰,吴杰良(中铁大桥局集团有限公司,湖北武汉430050)摘要:武汉青山长江公路大桥主桥为(350+938+350)m双塔双索面斜拉桥,大桥南主墩基础由大直径钻孔桩及哑铃形承台组成。承台平面尺寸巨大(98.9mx39.5m),埋置深度约15m,需进行超大型深基坑施工。承台采用锁口钢管桩围堰施工方案,围堰平
2、面设计为101.7m×41.3m的正多边形哑铃结构,总高35m,其中锁口钢管桩长33m,钢管桩顶部设有2m高单壁钢围堰(用以现场根据实时水位进行接高)。围堰共设有3层内支撑,内支撑为1.8m×1.2m的钢箱结构,封底混凝土厚5m,在承台系梁处设计8根乒1.8m辅助桩以减小封底混凝土应力。采用MIDAS软件对围堰整体及局部受力进行分析,结果表明,围堰结构各项指标均满足规范要求。关键词:斜拉桥;哑铃形承台;超大型深基坑;锁口钢管桩围堰;辅助桩;结构设计中图分类号:U445.556;U442.5文献标志码:ADesignofLockingSteelPipePileC
3、offerdamforSouthMainPierofQingshanChan西iangRiVerHighwayBridgeinWuhan’_,ANGYZn一,P托g,WUJZP—ZZn咒g(ChinaRailwayMajorBridgeEngineeringGroupCo.,Ltd.,Wuhan430050,China)Abstract:ThemainbridgeoftheQingshanChan翻iangRiverHighwayBridgeinWuhanisacable—stayedbridgewithdoublepylons,doublecableplan
4、esandwithspanarrangement(350+938+350)m.Thefoundationforthesouthmainpierofthebridgeiscomprisedofthe1argediameterboredpilesandthehugedimensiondumbbell—shapepilecap.Theplandimensionsofthepilecapare98.9m×39.5m,theembedmentdepthisabout15mandtheconstructionofthepilecapintheverylargeanddee
5、pfoundationpitisthereforeneeded.Thepilecapisconstructed,usingtheschemeofthelockingsteelpipepilecofferdam.Thecofferdamisdesignedasaregularpolygondumbbell—shapestructurewithitsplandimensionsbeing1O1.7m×41.3mandtotalheightbeing35m,ofwhichthelockingsteelpipepilesare3mlongandonthetopsoft
6、hesteelpipep订es,the2mhighsingle—wallsteelcofferdam(fortheheightextendingofthecofferdaminthefieldaccord—ingtotherealtimerisingwater1evels)isarranged.Totally3tiersoftheinternalbracingsarear—rangedinthecofferdam,theinternalbracingsarethesteelboxstructuresindimensionsof1.8m×1.2mandtheba
7、sesealingconcreteforthecofferdamis5mthick.Atthetiebeamsofthepilecap,8nos.of乒1.8maux订iarypilesarearrangedinordertoreducethestressofthebasesealingconcrete.ThesoftwareMIDASCivilisusedtoanalyzetheglobaland10calforcesofthecofferdamandtheresultsoftheanalysisdemonstratethatthevariousindice
8、softhecofferdamstru
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