金山铁路黄浦江特大桥施工监控

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1、桥梁建设2012年第42卷第1期(总第211期)BridgeConstruction，Vo1．42，No．1，2012(TotallyNo．211)文章编号：1003—4722(2012)01—0113—05金山铁路黄浦江特大桥施工监控宋胜录，伍小平，李茂兴(1．上海建工集团股份有限公司技术中心，上海200431；2．上海市基础工程有限公司，上海200433)摘要：上海金山铁路支线改造工程黄浦江特大桥为4x112m下承式简支钢桁梁桥，主桥采用悬臂拼装+辅助临时支架施工。该桥悬臂施工风险大，为确保施工安全，对主要构件施工过程中的应力、位移、反力等参数进行监控。采用MIDASCivil20

2、06软件建立空间模型，通过现场实测数据与理论数据对比分析可知：施工过程中大部分测点的实测应力小于理论应力，满足安全要求；由于节点板局部刚度影响，实际刚度较理论计算刚度大15左右；在最大悬臂工况下，实测位移小于理论位移，最大偏差达10mm；所有支撑反力均控制在3000kN以内，保证了悬臂施工过程中临时支撑的安全。关键词：铁路桥；桁架桥；悬臂拼装架桥；应力；位移；反力；桥梁施工；施工监控中图分类号：U448．211；U445．4文献标志码：AConstructionMonitoringandControlofHuangpuRiverBridgeonJinshanRailwaySONGShe

3、ng—lu，WUXiao-ping，LIMao—xing(1．TechniqueCenter，ShanghaiConstructionGroupCo．，Ltd．，Shanghai200431，China；2．ShanghaiFoundationEngineeringCo．，Ltd．，Shanghai200433，China)Abstract：HuangpuRiverBridgeoftheReconstructionProjectofJinshanRailwayBranchLineinShanghaiisasimply—supportedthroughsteeltrussgirderbr

4、idgewithspanarrangement4×112m．Themainbridgeofthebridgewasconstructedbythecantileverassemblinganderectionbytheaidoftemporarysupports．Becauseofriskofthecantileverconstructionandtoensuretheconstructionsafety，thestress，displacementandreactionforcesofprincipalcomponentsofthebridgeintheconstructionpro

5、cessweremonitoredandcontrolled．ThesoftwareMIDASCivil2006wasusedtosetupthespatialmodelsanditwasfoundfromthecomparisonandanalysisofthefieldmeasuredandtheoreticdatathatintheconstructionprocess，themeasuredstressac—quiredatmostofthemeasurementpointswaslessthanthetheoreticstressandcouldmeetthesafetyre

6、quirement．Affectedbythelocalrigidityofthegussetplates，themeasuredrigiditywasabout15％greaterthanthetheoreticrigidity．Undertheloadcaseofthelongestcantilevercon—struction，themeasureddisplacementwas1essthanthetheoreticdisplacementwiththemaximumtolerancebeing10mm．Thereactionforcesofallsupportswerecon

7、trolledwithin3000kNandthesafetyofthetemporarysupportsintheconstructionprocesswasguaranteed．Keywords：railwaybridge；trussgirderbridge；cantileverassemblinganderectionofbridge；stress；displacement；reactionforce；bridgeconstruction