主讲曾绍武陕西铁路工程第讲悬臂施工课件讲解

主讲：曾绍武

陕西铁路工程职业技术学院第25讲悬臂施工（1）《桥梁施工》精品资源共享课"BridgeConstruction"qualityresourcesharingclassLecture#25:Cantileverconstruction(1)bethespeaker：ZengShaowuSHAANXIRAILWAYINSTITUTE能力目标能够掌握悬臂施工适用条件及类型目标１目标２能够掌握零号段施工方案目标３临时固结的作用和方法悬臂施工cantilever-construction1AbilitytotargetCanmastertheapplicableconditionsandtypesofcantileverconstructionTarget1Target2Target3CanmastertheconstructionplanofsectionzeroRoleandmethodoftemporaryconsolidation任务1.悬臂施工类型及适用条件任务2.0号段施工方案任务3.临时固结的作用及方法本节任务资讯TheConstructionPlanofTaskSection2.0Task1.CantileverconstructiontypeandapplicableconditionsTask3.Roleandmethodoftemporaryconsolidation悬臂施工分类c悬臂浇筑法

悬臂拼装任务1.悬臂施工类型及适用条件Task1.Cantileverconstructiontypeandapplicableconditionscast-in-placecantilevermethodcast-in-placecantilevermethodConstructionclassificationofcantilever悬臂法：Suspensionarmmethod不需要搭设支架多孔同时开工，施工速度快悬臂施工设备挂篮或者悬拼吊机可以重复使用，费用较低，技术要求复杂任务1.悬臂施工类型及适用条件

适用条件：applicationcondition悬臂梁、连续梁、连续刚构桥，斜拉桥，拱桥。Thereisnoneedtobuildaporoussupportatthesametime,andtheconstructionspeedisfastCantileverconstructionequipmenthangingbasketorhangingcranecanbereused,lowcost,complextechnicalrequirementsThereisnoneedtobuildaporoussupportatthesametime,cantileverbeam,continuousbeam,continuousrigidstructurebridge,cable-stayedbridge,archbridge.Task1.Cantileverconstructiontypeandapplicableconditions

0号段悬臂浇筑段

合拢段悬臂施工边跨现浇段

支架法、托架法5-10m挂篮施工法3-5m有支架施工法2-3个悬臂浇筑段长挂篮骑跨（1-3m）cantileverbeintheprocessofconstructionSection0HangingarmpouringsectionSideacrossthecast-in-placesectionSupportmethodandbracketmethodare5-10mHangingbasketwithbracketconstructionmethod2-3cantileverpouringsectionlongworkingmethod3-5mbasketconstructionmethod3-5mHang-upbasketconstructionmethodof3-5MMHangingbasketspan(1-3m)Closethesegment任务1.悬臂施工类型及适用条件Task1.Cantileverconstructiontypeandapplicableconditions任务一导入

中国路桥14标承揽的大西线渭河特大桥在渭河滩段均为五跨连续梁桥，该企业采用悬臂浇筑法施工，故均存在0号块施工的问题。本讲课我们将以其作为经典案例来再现大西线0号块的施工过程，分析其保证安全和质量的具体施工措施，模拟完成0号块的施工任务。TheWeiheRiverBridgecontractedby14standardofChinaRoadandBridgeisallfive-spancontinuousbeambridgeinthebeachsectionofWeiheRiver.Theenterpriseadoptscantileverpouringmethod,sothereistheproblemofconstructionofblock0.Inthislecture,wewilltakeitasaclassiccasetoreproducetheconstructionprocessofDaxiLineblock0,analyzethespecificconstructionmeasurestoensuresafetyandquality,andsimulatethecompletionoftheconstructiontaskofblock0.任务一导入TaskoneimportTheWeiheRiverBridgecontractedby14standardofChinaRoadandBridgeisallfive-spancontinuousbeambridgeinthebeachsectionofWeiheRiver.Theenterpriseadoptscantileverpouringmethod,sothereistheproblemofconstructionofblock0.Inthislecture,wewilltakeitasaclassiccasetoreproducetheconstructionprocessofDaxiLineblock0,analyzethespecificconstructionmeasurestoensuresafetyandquality,andsimulatethecompletionoftheconstructiontaskofblock0.什么是0号块？

在挂篮悬臂浇注施工时，一般要分段实施。而位于墩身顶部的那一段叫做0号节段或0号块，各段依次向跨中编号。0号块一般构造最为复杂，预埋构件多，普通钢筋以及预应力束多，重量大。Whatisblock0？Inthehangingbasketcantileverpouringconstruction,generallytobeimplementedinsections.Thesectionatthetopofthepieriscalledsegment0orblock0,eachsectionnumberedinthemiddleofthespan.No.0blockisgenerallythemostcomplexstructure,moreembeddedcomponents,ordinarysteelbarsandprestressedbeam,largeweight满堂支架支撑钢管支架支撑Embeddedmemberbracketsupport预埋构件托架支撑任务2.0号段施工方案TheConstructionPlanofTaskSection2.0FullbracketsupportSteelpipesupport子任务一：钢管支架与支墩之间如何连接？Sub-task1:Howtoconnectbetweenthesteelpipebracketandthesupportpier最优连接方案分析讨论方案一：直接将钢管支架放在混凝土支墩上。方案二：在支墩内部预埋一块钢板，将钢管焊在钢板上。方案三：预留一圈钢筋，在钢筋上放一块薄钢板，最后将钢管放在钢板上，浇注支墩混凝土。AnalysisanddiscussionoftheoptimalconnectionschemeScheme1:Putthesteelpipesupportdirectlyontheconcretesupportpier.Scheme2:buryasteelplateinsidethesupportpier,andweldthesteelpipeonthesteelplate.Scheme3:reserveacircleofsteelbar,putathinsteelplateonthesteelbar,andfinallyputthesteelpipeonthesteelplate,pouringthesupportpierconcrete.

本典型案例根据设计所用大型钢管直径大小及位置预先在承台钢筋绑扎时埋入32mm粗钢筋一圈，然后在其顶部布置钢板予以支撑。任务分析：方案三更加合理可靠！Thistypicalcaseisbasedonthediameterandpositionofthelargesteelpipeusedinthedesign,andburyacircleof32mmthicksteelbarinthecap,andthenarrangesteelplateonthetopforsupport.Thistypicalcaseisanalyzedaccordingtothedesigntask:scheme3ismorereasonableandreliable!钢管之间的联结子任务二：钢管之间以及钢管与桥墩之间的联结钢管与桥墩之间的联结ConnectionbetweenthesteelpipesConnectionbetweenthesteelpipeandthebridgepiersSub-task2:theconnectionbetweensteelpipesandbetweensteelpipesandbridgepiers子任务三：钢管顶部与分配梁之间的联结

在钢管顶部焊接固定一块钢板，横向布置由两块工字钢焊接而成的横向分配梁，在其上铺设纵向工字钢。Sub-task2:theconnectionbetweensteelpipesandbetweensteelpipesandbridgepiersAsteelplateisweldedonthetopofthesteelpipe,andahorizontaldistributionbeamismadeoftwoI-steelwelded,onwhichtheverticalI-steelislaid任务三：钢管顶部与分配梁之间的联结在纵向工字钢之上满铺方木，在其上铺设木模板，两侧吊装大型钢模。Task3:theconnectionbetweenthetopofthesteelpipeandthedistributionbeamAbovethelongitudinalI-wordsteeliscoveredwithsquarewood,andwoodformworkislaidonit,andlargesteelmoldsarehoistedonbothsides.墩梁固结无支座墩梁铰结有支座为什么连续梁进行临时固结WhyarethecontinuousbeamstemporarilyconsolidatedPierbeamhingeHaveaseatPierbeamconsolidationNosupport

临时固结：是指为了确保悬臂施工过程中结构的安全稳定将0号块与桥墩临时固结在一起。Temporaryconsolidation:itmeansthetemporaryconsolidationofblock0andthebridgepiertoensurethesafetyandstabilityofthestructureduringthecantileverconstruction.任务3.临时固结的作用及方法Task3.Roleandmethodoftemporaryconsolidation临时固结(锁定)经过临时支座与桥墩固结，先形成静定状态的双悬臂T型刚构。在桥墩一侧或加临时支承或支墩，

采取支架式锚固措施。将0号块梁段临时支承在扇形或门式托架的两侧。任务四：临时固结施工Temporarysupportorsupporttoonesideofthepier,Takebracket-typeanchoragemeasures.Temporarysupportofblock0beamsectioninthefanshapeOrbothsidesofthedoorbracket.临时固结方法一：钢管桩支顶Temporaryconsolidationmethod1:steelpipepilesupporttop临时固结方法一：钢管桩支顶Temporaryconsolidationmethod1:steelpipepilesupporttop临时固结方法二：精扎螺纹钢锚固Temporaryconsolidationmethodtwo:fine-tierebaranchorage临时固结方法二：精扎螺纹钢锚固精扎螺纹钢硫磺砂浆Temporaryconsolidationmethod1:steelpipepilesupporttopFinerebarSulfurmortar箱梁内精扎螺纹钢锚固底板精扎螺纹钢FinerebarFinetierebaranchorbottomplateinsideboxbeam

★关于临时固结的硫磺砂浆→混凝土临时垫块要分开、分层

★采用预应力束临时固结，箱梁顶面设置临时垫★尽可能缩短临时固结解除时间

临时固结方法三：临时垫块★onthetemporaryconsolidationofthesulfurmortarThetemporaryconcretepadsshallbeseparatedandlayered★adoptstemporaryconsolidationwithprestressedbeamandtemporarycushiononthetopsurfaceofboxgirder★reducesthetemporaryconsolidationreleasetimewheneverpossi