刚性系杆拱桥更换吊杆的施工监控

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1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction，Vo1．44，No．5，2014(TotallyNo．228)文章编号：1003—4722(2014)05—0118～05刚性系杆拱桥更换吊杆的施工监控张西强，赵云强，陈慧。(1．中交路桥技术有限公司，北京100018；2．北京深华达交通工程检测有限公司，北京102200)摘要：琼州大桥主桥为(88+98+108+98+88)m下承式钢管混凝土系杆拱桥，该桥5跨为互相独立的无推力外部静定体系，拱肋均为钢管混凝土哑铃形断面，共118根吊杆，下锚

2、头部位锈蚀程度严重的8根吊杆采用临时兜吊系统进行更换施工。为保证吊杆更换施工中结构受力合理及安全，采用吊杆内力和桥面标高双控制原则，对吊杆更换过程进行施工监控。利用MIDASCivi1软件建立全桥有限元模型模拟吊杆更换施工，对吊杆拉力及桥面标高进行分析。结果表明：更换吊杆后桥面各项指标均在控制范围以内，且满足桥梁设计规范要求。关键词：拱桥；刚性系杆；吊杆更换；临时兜吊系统；桥面标高；吊杆拉力；有限元法；施工监控中图分类号：U448．22；U445．7文献标志码：AConstructionMonitoringandControl

3、ofHangerReplacementofaRigidTiedArchBridgeZHANGXi—qiang，ZHAOYun—qiang，CHENHui。(1．CCCCRoadandBridgeConsultantsCo．，Ltd．，Beijing100018，China；2．BeijingShenhuadaTransportEngineeringTestingCo．，Ltd．．Beijing102200。China)Abstract：ThemainbridgeoftheQiongzhouBridgeisaconcrete—f

4、illedsteeltube(CFST)throughtiedarchbridgewithspanarrangement(88+98+108+98+88)m．The5-spanarchstructuresofthemainbridgearetheexternallystaticallydeterminatesystemsthataremutuallyindependentandarewithnothrust．ThecrosssectionsofthearchribsarealltheCFSTdumb—bell—shapesec

5、tionsandtherearetotally118hangersforthewholebridge．Ofthesehangers，8hangersthatwereseverelycorrodedatthepartsoftheirloweranchorheadswerereplaced，usingthetemporarybottom—carryingliftingsystem．Toensurethattheforceconditionsofthestruc—tureswerereasonableandsafeinthehang

6、erreplacementconstruction，theprincipleofdoublecontrolofthehangerinternalforcesandbridgedeckelevationwasadoptedandtheconstructionprocessofthehangerreplacementwasmonitoredandcontrolled．ThesoftwareMIDASCivilwasusedtoestablishthemodelforthewholebridge，thehangerreplaceme

7、ntconstructionwassimu—latedandthehangerinternalforcesanddeckelevationwereanalyzed．Theresultsshowthatthevariousindicesofthedeckafterthehangerreplacementarewithinthecontrolledrangesandcanmeettherelevantrequirementsofthebridgedesigncodes．Keywords：archbridge；rigidtiedme

8、mber；hangerreplacement；temporarybottom—carryingliftingsystem；deckelevation；hangertensileforce；finiteelementmethod；constructionmonito—ringa