新白沙沱长江特大桥跨既有线钢桁梁施工方案比选.pdf

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1、桥梁建设2O14年第44卷第6期(总第229期)BridgeConstruction，Vo1．44，No．6，2014(TotallyNo．229)文章编号：1003—4722(2O14)06—0007—05新白沙沱长江特大桥跨既有线钢桁梁施工方案比选王明慧，姚发海。(1．渝黔渝万铁路有限责任公司，重庆410014；2．中铁大桥局股份有限公司，湖北武汉43OO50)摘要：渝黔铁路新白沙沱长江特大桥为双层6线铁路钢桁梁斜拉桥，主桥桥跨布置为(81+162+432+162+81)m，主梁采用N形桁架，2片主桁，全桥钢桁梁共68个

2、节间，其中重庆侧边跨4个节间钢桁梁跨越3条铁路线。为减少对既有线运营的影响，提出跨既有线钢桁梁采用双悬臂架设(方案1)和局部无导梁顶推与散拼相结合(方案2)2种方案施工，通过工期、安全及经济性等方面的比选，采用方案2。跨既有线钢桁梁采用无导梁顶推施工，在主墩旁支架上利用架梁吊机拼装钢桁梁，利用纵向千斤顶分3次将钢桁梁顶推跨越既有线；边跨其余节间采用膺架法散拼施工。关键词：斜拉桥；铁路桥；六线铁路；钢桁梁；既有铁路；顶推施工；方案比选；桥梁施工中图分类号：U448．27；U445．46文献标志码：AComparisonandS

3、electionofConstructionSchemesforSteelTrussGirderofNewBaishatuoChangjiangRiverBridgetoSpanExistingRailwayLinesWANGMing—hui．YAOFa—hal(1．YuqianYuwanRailwayCo．，Itd．，Chongqing410014，China：2．ChinaRailwayMajorBridgeEngineeringGroupCo．，Itd．，Wuhan430050，China)Abstract：TheNe

4、wBaishatuoChangjiangRiverBridgeonChongqing—GuiyangRailwayisadouble—deck6-linerailwaysteeltrussgirdercable—stayedbridgewithspanarrangement(81+162+432+1624-81)m．Themaingirderofthebridgeiscomposedof2mainN—shapetrusses．Therearetotally68panelsforthesteeltrussgirderofthe

5、wholebridge，ofwhichthe4panelsofthegirderofthesidespanonChongqingsideweretospantheexisting3railwaylines．Tominimizetheinterferenceoferectionofthepanelsofthegirderwiththeoperationoftheexistingrailwaylines，2kindsoftheconstructionschemesofthetwo—sidecantilevererection(S

6、cheme1)andthecombinedlocalincrementallaunchingwithnolaunchingnoseandpiece—by——pieceassemblingerec—tion(Scheme2)wereproposedandaftercomparisonoftheconstructiontimeschedules．safetyandeconomy，itwasdeterminedthattheScheme2shouldbeselected．IntheScheme2，the4panelsofthegi

7、rderspanningtheexistingrailwaylineswereincrementallylaunchedwithnolaunchingnose．Onthescaffoldingsbythesidesofthemainpiers，thedeckcraneswereusedtoassemblethegirder，thelongitudinaljackswereusedtolaunchthepanelsofthegirderacrosstheexistingrailwaylinesin3timesandtheres

8、tpanelsofthegirderofthesidespanwereassembledonscaffoldingspiecebypiece．Keywords：cable—stayedbridge；railwaybridge；six-linerailways；steeltrussgirde