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1、橋梁建設(shè)2012年第42卷第5期(總第215期)BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)95文章編號：1003—4722(2012)05—0095—08大跨度連續(xù)鋼桁梁柔性拱橋帶拱頂推施工(1．中鐵四局集團鋼結(jié)構(gòu)有方限公繼司，，安夏徽合陽肥，張慶發(fā)，王靜峰230031；2．合肥工業(yè)大學(xué)，安徽合肥230009)摘要：南淝河特大鐵路橋為鋼桁梁柔性拱結(jié)構(gòu)，采用了鋼桁梁帶拱頂推施工，對帶拱頂推的施工設(shè)備、主要施工工況及施工關(guān)鍵技術(shù)進行分析。為實現(xiàn)鋼桁梁帶拱頂推，施工時主要布置了拼裝支架、輔助墩、導(dǎo)梁等輔助鋼結(jié)構(gòu)系統(tǒng)，并采用多點
2、同步頂推和機電液一體化原理施工。鋼桁梁帶拱頂推施工主要包括4個工況：鋼桁梁多點頂推至最大懸臂，柔性拱體系未形成、鋼桁梁帶拱頂推，柔性拱拱腳合龍，鋼桁梁帶拱頂推就位。利用MIDASCivil軟件建模分析，根據(jù)分析結(jié)果采取措施實現(xiàn)了帶拱頂推、導(dǎo)梁上墩、無應(yīng)力合龍等關(guān)鍵施工技術(shù)；同時采取施工監(jiān)控技術(shù)，確保成橋后橋梁的內(nèi)力、應(yīng)力及線形與設(shè)計相符。關(guān)鍵詞：鐵路橋；拱橋；鋼桁梁；頂推法架橋；橋梁施工中圖分類號：U448．22；U445．46文獻標(biāo)志碼：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
