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1、大跨度连续刚构柔性拱组合桥施工控制62桥梁建设2009年第6期文章编号:1003—4722(2009)06—0062—05大跨度连续刚构柔性拱组合桥施工控制刘振标,严爱国,罗世东,张立超(1.中铁第四勘察设计院集团有限公司,湖北武汉430063;2.中铁大桥局集团有限公司,湖北武汉430050)摘要:宜万铁路宜昌长江大桥主桥为(130+2×275+130)m连续刚构柔性拱组合桥,主梁采用单箱双室截面,拱肋采用钢管混凝土桁架拱.该桥采用"先梁后拱"法施工,其施工控制的难点和重点为主梁两合龙段同时对顶合龙与两跨拱肋竖转合龙,施3--控制的内容主要包
2、括线形控制和应力监测.采用预测控制法对施工误差进行分析,识别,调整;通过3种有限元模型对比,适当修正主粱预抛高值.施工过程中的线形和应力监控结果表明,主梁和拱肋成桥线形误差均控制在允许范围内,结构应力满足设计要求,施工控制效果良好.关键词:铁路桥;组合结构;悬臂浇筑;竖向转体;施工控制中图分类号:U445.1;U448.13文献标志码:AConstructionControlofLongSpanHybridBridgeofContinuousRigidFramesandFlexibleArchesLIUZhen—biao.YANAi—guo,L
3、UOShi—dong,ZHANGLi—chao(1.ChinaRailwayTiesiyuanSurveyandDesignGroupCo.,Ltd.,Wuhan430063,China;2.ChinaZhongtieMajorBridgeEngineeringGroupCo.,Ltd.,Wuhan430050,China)Abstract:ThemainbridgeofYichangChangjiangRiverBridgeonYichang—WanzhouRailwayisalongspanhybridbridgeofcontinuousr
4、igidframesandflexiblearcheswithspanarrangement(130+2×275+130)m.Themaingirderofthebridgeisdesignedasthedouble—cellandsingleboxcrosssectionandtheconcrete—filledsteeltubetrussarchesareusedforthearchribs.Thebridgeisconstructedbythemethodof''erectingthegirderfirstandthearchribsla
5、te",ofwhichthedifficultandcriticalpointsoftheconstructioncontro1arethatthetWOclosuresegmentsofthemaingirderwillbeclosedinawayofsimultaneousoppositejackingandthearchribsoftwospansofthebridgewillbeclosedinawayofverticalrotation.Theconstructioncontrolmainlyincorpo—ratesthegeome
6、triccontrolandstressmonitoring.Theprediction—controlmethodisusedtoana—lyze,recognizeandadjusttheconstructionerrorsandthepre—cambervaluesofthemaingirderwillbeappropriatelymodifiedbythecomparisonofthethreekindsofthefiniteelementmodels.Theresultsofthegeometriccontrolandstressmo
7、nitoringintheconstructionindicatethegeo—metricerrorsofthemaingirderandarchribsofthecompletedbridgehavebeenallcontrolledwithintheallowablerange,thestructuralstresscansatisfythedesignrequirementsandthecon—structioncontroliSeffective.Keywords:railwaybridge;hybridstructure;canti
8、levercasting;verticalrotation;construe—tioncontro1收稿日期:2008—11—07基金项目:铁道部科技
