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时间:2019-05-14
《大跨度连续钢桁梁柔性拱桥带拱顶推施工》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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