大跨度连续钢桁梁柔性拱桥带拱顶推施工

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1、桥梁建设2012年第42卷第5期(总第215期)BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)95文章编号：1003—4722(2012)05—0095—08大跨度连续钢桁梁柔性拱桥带拱顶推施工(1．中铁四局集团钢结构有方限公继司，，安夏徽合阳肥，张庆发，王静峰230031；2．合肥工业大学，安徽合肥230009)摘要：南淝河特大铁路桥为钢桁梁柔性拱结构，采用了钢桁梁带拱顶推施工，对带拱顶推的施工设备、主要施工工况及施工关键技术进行分析。为实现钢桁梁带拱顶推，施工时主要布置了拼装支架、辅助墩、导梁等辅助钢结构系统，并采用多点

2、同步顶推和机电液一体化原理施工。钢桁梁带拱顶推施工主要包括4个工况：钢桁梁多点顶推至最大悬臂，柔性拱体系未形成、钢桁梁带拱顶推，柔性拱拱脚合龙，钢桁梁带拱顶推就位。利用MIDASCivil软件建模分析，根据分析结果采取措施实现了带拱顶推、导梁上墩、无应力合龙等关键施工技术；同时采取施工监控技术，确保成桥后桥梁的内力、应力及线形与设计相符。关键词：铁路桥；拱桥；钢桁梁；顶推法架桥；桥梁施工中图分类号：U448．22；U445．46文献标志码：AIncrementalLaunchingConstructionofaLongSpanBridgewithContinuousSteelT

3、russGirderandFlexibleArchFANGJi，XIAYang，ZHANGQing—fa。WANGJing—feng。(1．SteelStructureCo．，Ltd．，ChinaRailwaySijuCivilEngineeringGroup，Herei230031，China；2．HefeiUniversityofTechnology，Hefei230009，China)Abstract：TheSouthFeiheRiverRailwayBridgeisalongspanstructurewithcontinuoussteeltrussgirderandfl

4、exiblearchconstructedbytheincrementallaunchingofthetrussgirderwiththearch．Forthelaunchingofthegirderwiththearch，theconstructionequipment，princi—palconstructionloadcasesandtherelatedkeyconstructiontechniqueswereanalyzed．Torealizethesmoothlaunching，theauxiliarysteelstructuralsystemsoftheassemb

5、lingscaffoldings。auxil—iarypiersandlaunchingnosewerearrangedintheconstructionandthelaunchingwascarriedout，usingthemulti～pointconcurrentlaunchingandtheintegratedmachinery，electricalpowerandhy—draulicprinciple。Thelaunchingofthegirderwiththearchmainlyincludedfourloadcasesofthemulti—pointlaunchi

6、ngofthegirdertoitslongestcantilever；thelaunchingofthegirderwiththearchbeforeformationofthecompleteflexiblearchsystem；theclosureofthefiexiblearchspringandthefinallaunchingofthegirderwiththearchinplace．ThesoftwareMIDASCivilwasusedtoestablishthemodelandtoconducttheanalysisofthelaunchingandaccor

7、dingtotheresuItsoftheanalysis，thenecessarymeasuresweretakentorealizethekeyconstructiontechniquesforthelaunching，reachingofthelaunchingnosetothefrontpiersandunstressedclosureofthearchspring．Atthesametime，theconstructionmonitoringandcontro1techniques