跨既有线顶推施工预应力混凝土箱梁设计及施工需要注意的问题

Ih-I(102600)IU445462A10042954(2012)02003l03AnalysisforKeyProblemsinDesignandConstructionofPrestressedConcreteBoxGirderwithIncrementalLaunchingMethodCrossingOverExistingLineSuGuoming(ChinaRailwayFifthSurveyandDesignInstituteGroupCoLtdBeijing102600)AbstractThebridgecrossingoveranexistinglinearecommonlyerectedbyswingmethodandincrementallaunchingmethodtoavoidtheinterferenceonrailwaytrafficSwingmethodshouldbethepreferredmethodwhentheconstructionconditionsarenotlimitedwithwhichtheconstructionperiodisshortandwithoutsystemconversionIncrementallaunchingmethodmaybeadoptedwhenthebridgeislocatednearbytheexistingbuildingsandcannotbeswungSteelbridgeshouldnotbeadoptedinthecaseofcrossingovertheexistinglinebecauseofthemaintenanceneedsinthefutureAimingattheprestressedconcreteboxgirderbyincrementallaunchingmethodthepaperputsforwardrelevantsolutionsabouttheundermentionedproblemswhendesigntheproblemsaretheconfigurationoftemporarysteeltendonconnectionbetweenguidebeamandconcretegirderrigidityofpermanentpierandtemporarypierthealignmentofgirderbottometcwhenconstructiontheproblemsaretheexcessivelaunchingforcedeformationofslidewaytroubleonsliderinsertingexcessivedeformationonpiertopcrackingatthepierbottomandatthejointbetweenguidebeamandconcretegirderereKeywordsprestressedconcreteexistinglineincrementallaunchingconstruction1201lIOOB(1971)T1993RAILWAYSTANDARDDESIGN2012(2)1611011031228140m+1128m+140mR=2300m13lm3365m+861m+84m861m352809kN28m290m205m028m025m050m03511160m(1)40m28m34157th5mm52157tk5mm{iJlj1lcm0033(30+40+2x30)ITI3x28m22m2237111170m9565m32nl28cm38cm25cm35em60cm10ml45cm20cm30cm15m()x22m()12nl()18m()2332mI?3AYsTAXBARnDEsT43()40m7L48rll441486m475m40m6936m(43m)345cm30cm32cm645cm70cm105cm3454m3821000mmxl6mrll3979m4125(1)ffRAILWAYSTANDARDDESIGN2015($)(2)m(3)(4)6[I[J]2009(11)[2]48m[J2010(6)[3][J]2003(12)[4][J]1990(6)[5][J]2002(10)[6]1[J]2005(2)[7][J]1992(6)[8][J]1998(2)[9]T[J]1997(4)[10][J]2004(8)