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时间:2019-08-29
《跨航道连续梁桥顶推拆除紧急施工监控技术》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、桥梁建设2013年第43卷第5期(总第222期)BridgeConstruction,Vol.43,No.5,2013(TotallyNo.222)111文章编号:1003-4722(2013)05-0111-06跨航道连续梁桥顶推拆除施工监控技术王凯1,王社2(1.中国铁道科学研究院铁道建筑研究所,北京100081;2.长安大学理学院,陕西西安710064)摘要:旧桥拆除较新建桥梁具有更多未知因素和潜在危险,为保证桥梁在拆除过程中的安全性,以一座跨航道连续梁桥顶推拆除施工为例,对该桥拆除过程进行施工监控。
2、利用有限元软件MIDASCivil建立全桥空间杆系模型,对桥梁拆除过程中各施工阶段结构受力及变形的情况进行计算分析,对主桥上部结构关键截面及下部结构的应力和变形进行监测,比较分析桥跨结构及临时结构在整个施工过程中的受力及位移变化规律。结果表明,桥梁结构在拆除过程中的线形及应力均在可控安全范围内。此桥现已顺利顶推拆除完成。关键词:连续梁桥;顶推法;旧桥拆除;有限元法;施工模拟;施工监控中图分类号:U448.215文献标志码:ATechniquesofConstructionMonitoringandContr
3、olforDemolishingofaContinuousGirderBridgeoverShipChannelbyIncrementalLaunchingMethod1,WANGShe1WANGKai(1.RailwayEngineeringResearchInstitute,ChinaAcademyofRailwaySciences,Beijing100081,China;2.SchoolofSciences,Chang′anUniversity,Xi′an710064,China)Abstract:T
4、hedemolishingofoldbridgeshasmoreuncertaintiesandpotentialdangerthanthebuildingofnewbridgeswillhave.Toensurethesafetyofthebridgesintheprocessofthede-molishing,thedemolishingofacontinuousgirderbridgeovershipchannelbytheincrementallaunchingmethodwascitedasane
5、xampleandtheconstructionmonitoringandcontrolofthede-molishingofthebridgewasimplemented.ThefiniteelementsoftwareMIDASCivilwasusedtosetupthespatiallinkmodelforthewholebridgeofthebridge,thestructuralforceconditionsanddeformationofthebridgeatvariousconstructio
6、nstagesinthedemolishingwerecalculatedandanalyzed.Thestressanddeformationofthecriticalsectionsofthesuperstructureandsub-structureofthemainbridgeweremonitoredandthechanginglawsoftheforceconditionsanddis-placementofthebridgespansandthetemporarystructuresinthe
7、wholeconstructionwerecom-paredandanalyzed.Theresultsoftheanalysisindicatedthatthegeometricshapesandstressofthebridgestructuresinthedemolishingwereallwithinthecontrollablesafetyrangeandthede-molishingofthebridgebytheincrementallaunchingmethodwasfinallysmoot
8、hlycompleted.Keywords:continuousgirderbridge;incrementallaunchingmethod;oldbridgedemolis-hing;finiteelementmethod;constructionsimulation;constructionmonitoringandcontrol[1,2]1引言要进行拆除处理。桥梁结构荷载大、结构体系早期修建的桥梁,由于设
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