安庆长江铁路大桥3号墩巨型圆围堰气囊下河技术

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1、桥梁建设2012年第42卷第2期(总第212期)BridgeConstruction，Vo1．42，No．2，2012(TotallyNo．212)文章编号：1003—4722(2012)02—0001—06安庆长江铁路大桥3号墩巨型圆围堰气囊下河技术汪水清，农代培(1．宁安铁路有限责任公司，安徽芜湖241000；2．中铁大桥局安庆长江铁路大桥指挥部，安徽安庆246008)摘要：安庆长江铁路大桥3号墩基础施工采用双壁钢围堰方案，围堰直径达56m。为实现底节围堰下河，经方案比选，3号墩底节围堰高2O．08m，采用气囊法整体下河。通过在围堰内设置2道相互平行

2、且与围堰井壁连接成整体的钢承重梁结构和底托架结构，作为气囊法整体下河上滑道。根据围堰结构并经计算，围堰滑道下方采用36只≠1．8m×8．0m规格的承托气囊。围堰下河场地选在下游一修船厂内，紧邻水边，尺寸约120m×150m，入水口地面坡度为6．25。入水口采取挖掘清淤方式形成水深3m以上的陡坎，避免围堰入水搁浅。围堰下河后临时锚泊，以便完成落放托架和浮运编队工作。关键词：铁路桥；斜拉桥；围堰；气囊法；整体下河；桥梁施工中图分类号：U448．27；U445．556文献标志码：ATechniquesofAirBagMethodLaunchingforHuge

3、CircularSteelCofferdamofPierNo．3ofAnqingChangjiangRiverRailwayBridgeWANGShui—qing，NONGDai—pei(1．NinganRailwayCo．，Ltd．，Wuhu241000，China；2．ConstructionHeadquartersofAnqingChangjiangRiverRailwayBridge，ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Anqing246008，China)Abstract：Thefou

4、ndationofPierNo．3ofAnqingChangjiangRiverRailwayBridgewascon—structedbythecirculardouble—walIsteelcofferdamthatis56mindiameter．Tolaunchthebot—tomliftofthecofferdam，2O．08minheight，downtotheriver，thedifferentconstructionschemeswerecomparedanditwasdeterminedthattheliftofthecofferdamw

5、ouldbeintegrallylaunchedtotheriverbytheairbagmethod．Beforethecofferdamwas1aunched．twosteel1oad—carryingbeamsandbasebracketingstructuresweresetinthecofferdam，thebeamswerear—rangedinparallelwitheachotherandwereconnectedwiththewallsofthecofferdamandthebeamsandbracketingstructureswer

6、eusedastheupperslipwaysforthelaunching．Inaccordancewiththestructuralfeaturesofthecofferdamandtherelatedcalculation，36nos．oftheairbags，eachinsizeof1．8m×8．0m，weresetunderneaththeslipways．Thesiteforthelaunchingwaschosenataplaceinthedockyardthathasaccessroadandpowersupplyatthedownstr

7、eamoftheriver．Thechosensiteisclosetotheriverside，theareaofthesiteisl20m×150m，thegroundgradientatexitofthelaunchingtotheriveris6．25andtheexitwasexcavatedintoasharppitwithwaterdeeperthan3mtoavoidthatthecofferdamwouldrushashore．Afterthecofferdamwaslaunchedtotheriver，thecofferdamwast

8、emporarilymooredtowaitforthecompletingof