欢迎来到天天文库
浏览记录
ID:36758829
大小:746.29 KB
页数:6页
时间:2019-05-14
《江顺大桥主桥Z4号墩钻孔桩施工关键技术》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2013年第43卷第1期(总第218期)116BridgeConstruction,Vo1.43,No.1,2O13(TotallyNo.218)文章编号:1003—4722(2013)01—0116—06江顺大桥主桥Z4号墩钻孔桩施工关键技术胡勇,张家伦,杨二永(中铁大桥局集团第四工程有限公司,江苏南京210031)摘要:江顺大桥主桥为主跨700m的双塔双索面混合梁斜拉桥,其Z4号墩采用28根3.0m钻孔灌注桩,桩长47.5~72m,钻孔深度达81.5m。针对该墩深水、浅覆盖层、斜岩面、超硬岩质、岩层分布不均、夹层多等不利现象,采取超前地质钻孔、针对性钻孔平
2、台设计与快速施工、选择APE400B单锤插打钢护筒、分区域配置冲击钻和回旋钻、严格控制泥浆指标和钻进参数等关键技术措施,在洪峰来临前完成全部钻孔桩施工。超声波检测显示28根桩基质量均满足设计和规范要求。关键词:斜拉桥;基础;钻孔灌注桩;桥梁施工中图分类号:U448.27;U443.154文献标志码:AKeyTechniquesforConstructionofBoredPilesofPierZ4ofMainBridgeofJiangshunBridgeH【,Yong,ZHANGJia—lun,YANGEr—yong(The4thEngineeringCo.。Itd.,
3、ChinaRailwayMajorBridgeEngineeringGroup,Nanjing21003i,China)Abstract:ThemainbridgeoftheJiangshunBridgeisahybridgirdercable—stayedbridgewithdoublepylons,doublecableplanesandwithamainspan700m.ThePierZ4ofthebridgeissup—portedonthefoundationof28nos.of3.0mboredpilesthatare47.5~72mlongandhave
4、thegreatestboringdepthupto81.5m.InthelightofthedisadVantageousconstructionconditionsofthedeepwater,shallowoverburden,inclinedrocksurface,veryhardrock,non—uniformdistribu—tionofrockstrataandsandwichatthelocationofthepier,theboredpileswereconstructedwiththefollowingkeytechnicalmeasures,in
5、cludingthoseofthegeologyboringinadvance,purposivedesignandrapidconstructionoftheboringplatform,drivingofthesteelcasingsbytheAPE400Bsinglehammer,utilizingofthepercussionboringandrotaryboringforthepilesindifferentareasandstrictcontroloftheslurryindicesandboringparameters.Theconstructionof
6、allthepileswasfinallysmoothlycompletedbeforethearrivalofthefloodpeakandtheinspectingofthepilesbytheultrasonicdetectionprovedthatthequalityofthe28nos.ofthepilescouldallmeettherel—evantrequirementsinthedesignandcodes.Keywords:cable—stayedbridge;foundation;boredpile;bridgeconstruction1工程概况
7、向6车道,荷载为公路一I级,设计洪水频率为300广佛江快速通道江顺大桥(以下简称江顺大桥)年一遇,单孔双向通航,主通航孔为650m×22m。是连接江门市蓬江区与佛山市顺德区的一座特大型江顺大桥主桥上部结构设计为混合梁,中跨钢箱梁桥梁。江顺大桥全长2297m,由主桥和东、西引桥为扁平流线型,梁长1016m,梁宽40m,中心线处组成,其中主桥设计为双塔双索面混合梁斜拉桥,跨梁高3.5m,每延米重22.3t;边跨预应力混凝土径布置为(60+176+700+176+60)m。该桥为双压重梁外轮廓与钢箱梁一致,单侧长78m,每延米收稿日期:2012—10—22
此文档下载收益归作者所有