安庆长江铁路大桥3号桥塔墩钢护筒群施工技术

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1、桥梁建设2011年第5期文章编号：1003—4722(201I)05—0006—05安庆长江铁路大桥3号桥塔墩钢护筒群施工技术黄旺明，皮军云(中铁大桥局集团有限公司，湖北武汉430050)摘要：安庆长江铁路大桥为双塔钢桁梁斜拉桥，其3号桥塔墩为大直径深水钻孔桩基础，采用钢围堰法施工。由于墩位处河床覆盖层厚不足1m，钢套箱围堰下沉着床后，河床基本冲刷为光板岩，为解决钻孔桩钢护筒的安装及定位问题，除中心钢护筒直接下沉安装外，其余36根钢护筒按区域分为A、B、C三类5组分批整体制造安装。护筒群A、B在码头上整体制造组拼后船运至墩位，利用浮吊整体下放后悬挂在围堰上，利用悬挂系

2、统及导向槽结构调整并精确定位；护筒群C随围堰底节一同下沉着床。全部护筒安装定位后，在护筒内填砂堵漏、分层浇注水下封底混凝土以预埋固定钢护筒，最后进行钻孔桩施工。关键词：安庆长江铁路大桥；斜拉桥；钻孔桩；摩擦桩；钢护筒群；桥梁施工中图分类号：U448．27；U445．551文献标志码：AConstructionTechniquesforSteelCasingGroupsofPylonPierNo．3ofAnqingChangjiangRiverRailwayBridgeHUANGWang—mingtPIdun。yun(ChinaRailwayMajorBridgeEng

3、ineeringGroupCo．，I．td．，Wuhan430050，China)Abstract：AnqingChangjiangRiverRailwayBridgeisasteeltrussgirdercable—stayedbridgehavingdoublepylons．ThePylonPierNo．3ofthebridgerestsonthedeepwaterlargediameterboredpilefoundationthatwasconstructedbythesteelboxedcofferdammethod．Sincetheriverbedover

4、burdenatthe1ocationofthepieriSnotdeeperthan1m，theriverbedwasscouredalmostintobareslateshortlyafterthesteelboxedcofferdamwassunkdownandlandedthere．I'ore～solvetheproblemofinstallingandpositioningthesteelcasingsforconstructionoftheboredpiles，withtheexceptionthatcentralsteelcasingwasdirectl

5、ysunkdownandinstalled，therestofthe36stee1casingswereclassifiedinto3kindsofA，B，Cand5groupsinaccordancewiththedifferentareasofthefoundationandweretobeintegrallyfabricatedandinstalledinbatches．ThesteelcasinggroupsAandBwerefirstlyfabricatedandassemblednearbythewharf，shippedtothepiersite，int

6、egrallylowereddownandsuspendedontothecofferdambyfloatingcraneandad—justedandpreciselypositioned，usingthesuspensionsystemandguidinggroovestructure．ThesteelcasinggroupCwasthensunkdowntotheriverbedtogetherwiththebottomliftofthecolferdam．Afterallthesteelcasingswerewellinstalledandpositioned

7、inplace，thecasingswerefilledwithsandtostopwaterfromcomingin，thebasesealingtremieconcretewasdepositedinlayerstofixthecasingsandfinallytheconstructionoftheboredpileswastoproceed．Keywords：AnqingChangjiangRiverRailwayBridge；cable—stayedbridge；boredpile；fric～tionalpile；steelcasinggr