大跨度連續(xù)剛構(gòu)柔性拱組合橋施工控制

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1、大跨度連續(xù)剛構(gòu)柔性拱組合橋施工控制62橋梁建設(shè)2009年第6期文章編號(hào):1003—4722(2009)06—0062—05大跨度連續(xù)剛構(gòu)柔性拱組合橋施工控制劉振標(biāo),嚴(yán)愛(ài)國(guó),羅世東,張立超(1.中鐵第四勘察設(shè)計(jì)院集團(tuán)有限公司,湖北武漢430063;2.中鐵大橋局集團(tuán)有限公司,湖北武漢430050)摘要:宜萬(wàn)鐵路宜昌長(zhǎng)江大橋主橋?yàn)?130+2×275+130)m連續(xù)剛構(gòu)柔性拱組合橋,主梁采用單箱雙室截面,拱肋采用鋼管混凝土桁架拱.該橋采用"先梁后拱"法施工,其施工控制的難點(diǎn)和重點(diǎn)為主梁兩合龍段同時(shí)對(duì)頂合龍與兩跨拱肋豎轉(zhuǎn)合龍,施3--控制的內(nèi)容主要包

2、括線(xiàn)形控制和應(yīng)力監(jiān)測(cè).采用預(yù)測(cè)控制法對(duì)施工誤差進(jìn)行分析,識(shí)別,調(diào)整;通過(guò)3種有限元模型對(duì)比,適當(dāng)修正主粱預(yù)拋高值.施工過(guò)程中的線(xiàn)形和應(yīng)力監(jiān)控結(jié)果表明,主梁和拱肋成橋線(xiàn)形誤差均控制在允許范圍內(nèi),結(jié)構(gòu)應(yīng)力滿(mǎn)足設(shè)計(jì)要求,施工控制效果良好.關(guān)鍵詞:鐵路橋;組合結(jié)構(gòu);懸臂澆筑;豎向轉(zhuǎn)體;施工控制中圖分類(lèi)號(hào):U445.1;U448.13文獻(xiàn)標(biāo)志碼: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基金項(xiàng)目:鐵道部科技