平潭海峡公铁两用大桥Z03号墩导管架施工关键技术.pdf

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1、桥梁建设2016年第46卷第4期(总第239期)BridgeConstruction，V01．46，No．4，2016(TotallyNo．239)文章编号：1003—4722(2016)04—0001一05平潭海峡公铁两用大桥Z03号墩导管架施工关键技术徐启利，王东辉(中铁大桥局集团有限公司，湖北武汉430050)摘要：平潭海峡公铁两用大桥的鼓屿门水道桥为(128+154+364+154+128)m的钢桁混合梁斜拉桥，该桥Z03号墩基础采用18根≯4．5m超大直径钻孔桩，墩位处水深45m，海床为裸露强风化花岗岩。针对墩位处复杂的水文地质条件和恶劣的海洋施工环境，Z03号墩采用导管架钻孔平台

2、方案施工。导管架总平面尺寸为114m×70m，采用52根≯1700mm×12mm套管，套管间设4层庐600mm×8mm钢管联结系。导管架套管顶高程为+2．96m，底口高程根据海床扫测结果设置；套管平面上分3组制造；采用浮吊将导管架整体吊装运输至墩位，初步定位后下放着床，利用角桩调平系统精确调平定位；导管架调平后在套管内插打直径1．5m的支承桩，并采用级配碎石填充导管架套管与支承桩间的缝隙，快速形成钻孔平台下部结构。关键词：跨海大桥；公路铁路两用桥；斜拉桥；钻孔桩基础；钻孔平台；导管架；桥梁施工中图分类号：U448．27；U445．551文献标志码：AKeyTechniquesforConst

3、ructionofJacketSupportsatPierZ03ofGuyumenWaterwayBridgeofPingtanStraitsRail--cum--RoadBridgeXUQi—li，WANGDong—hui(ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan430050，China)Abstract：TheGuyumenWaterwayBridgeofthePingtanStraitsRail—cure—RoadBridgeisasteeltrusshybridgirdercable—stayedbridgewiths

4、panarrangement(128+154+364+154+128)m．ThefoundationforthepierZ03ofthebridgeistheonethatiscomprisedof18nOs．ofthe4．5msuperlargediameterboredpiles．Thewaterdepthatthepiersiteis45mandtheseabedistheuncoveredintensivelyweatheredgranite．Inthelightofthecomplexhydrologyandgeologycondi—tlonsandtheharshmarineco

5、nstructionenvironmentatthepiersite，theboredpilesofthepierwereconstructed，usingtheschemeofthejacketboringplatform．Thegeneralplandimensionsofthejacketsupportsoftheplatformare114m×70m．52nos．ofthe≠1700mmx12mmiacketswereusedforthesupportsandamongthejackets，4levelsofthetiesystemsofthe乒600mm×8mmsteelpipes

6、werearranged．Theelevationofthejackettopsis+2．96mandtheelevationofthebottomopeningsofthejacketsissetaccordingtOthescanningsurveyoftheseabed．IntheplanoftheJacketsupports，thesupportsweremanufacturedin3groupsandthesupportswereintegrallyliftedandtransportedtOthepiersitebythefloatingcrane．AtthetimetheSUp

7、portswereDrelimi—narilypositioned，thesupportswerelowereddowntOtheseabedandthesupportswerethenpre-ciselyleveledandpositioned，usingthecornerpilelevelingsystems．Afterthesupportswere1ev—eled，the庐1．5msupportpile