南宁市五象大桥钢箱梁施工方案比选

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1、桥梁建设2015年第45卷第4期(总第233期)BridgeConstruction，Vo1．45，No．4，2015(TotallyNo．233)119文章编号：1003—4722(2015)04—0119—05南宁市五象大桥钢箱梁施工方案比选李方敏，和宣文。(1．中铁九桥工程有限公司，江西九江332004；2．云南省迪庆公路管理总段维西公路管理段，云南迪庆674600)摘要：南宁市五象大桥主桥为(45+1OO+300+1O0+45)m双塔双索面钢箱梁斜拉桥，主梁为横向分离的两全焊流线型扁平封闭钢箱梁。针对该桥钢箱梁施工难点，提出了对

2、称悬臂拼装施工(方案1)和非对称悬臂拼装施工(方案2)2种钢箱梁施工方案，通过设备、工期及河道水位影响等方面的比选，采用方案2施工。该方案主要施工设施包括变幅式桥面吊机、边跨临时支架及顶推系统、滑移支架和桥塔墩墩旁托架及滑移系统。在边跨无水区域布置滑移支架及临时支架，安装变幅式桥面吊机，采用项推系统后退滑移及吊机前移的方法安装边跨钢箱梁；中跨侧钢箱梁采用单侧桥面吊机悬臂拼装，利用边跨已架钢箱梁，调整索力实现非对称悬臂拼装施工。关键词：斜拉桥；钢箱梁；变幅式桥面吊机；顶推施工；悬臂拼装施工；方案比选；桥梁施工中图分类号：U448．27；U

3、445．4文献标志码：AComparisonandSelectionofConstructionSchemesforSteelBoxGirdersofWuxiangBridgeinNanningCityLIFang-min，HEXuan-wen(1．ChinaRailwayJiujiangBridgeEngineeringCo．，Ltd．，Ji~iang332004，China；2．WeixiHighwayAdmini—strationSection，DiqingHighwayAdministrationDepartment，Yunna

4、nProvince，Diqing6746000，China)Abstract：ThemainbridgeoftheWuxiangBridgeinNanningCityisasteelboxgirdercable-stayedbridgewithdoublepylons，doublecableplanesandwithspanarrangement(45+100+300+100+45)m．ThemaingirderofthebridgehastWOall—weldedstreamlinedflatclosedsteelboxgirders

5、separatinginthetransversedirection．Inthelightoftheconstructiondifficultiesofthesteelboxgirders，twoconstructionschemesofthesymmetriccantileverassembling(Scheme1)andasymmetriccantileverassembling(Scheme2)forthegirderswereputforward．Throughcom—parisonoftheinfluencesoftheinv

6、olvedequipment，constructiontimeschedulesandwater1evels，itwasdeterminedthattheScheme2shouldbeadopted．IntheScheme2，theconstructionfacilitiesmainlyincludedtheluffingdeckcranes，sidespantemporaryscaffoldingsandpushingsystem，slidingscaffolding，pylonpiersidebracketandslidingsys

7、tem．IntheareaofthesidespansnotO—verwater，theslidingscaffoldingandtemporaryscaffoldingswerearranged，theluffingdeckcraneswereinstalledandthesidespansteelboxgirderswereerectedbywithdrawingthepushingsystemandforwardingthedeckcranes．Thecentralspansteelboxgirderswereerectedbyt

8、hecan-tileverassemblingbythedeckcranearrangedononeside．Bytakingtheadvantageoftheassem—bledsidespansteel