攀枝花新密地大桥拱圈悬臂浇注施工监控

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1、桥梁建设2012年第42卷第4期(总第214期)BridgeConstruction，Vo1．42，No．4，2012(TotallyNo．214)87文章编号：1003—4722(2012)04—0087—06攀枝花新密地大桥拱圈悬臂浇注施工监控张铎，何畏，蒋长江，袁霖宇(1．西南交通大学土木工程学院，四川成都610031；2．同济大学土木工程学院，上海200092)摘要：攀枝花新密地大桥为主跨182m的混凝土拱桥，采用悬臂浇筑法施工拱圈，为确保施工过程的安全性和成桥状态的准确性，需要在施工各阶段对线形、索力及应力等参数进行监控。以上游

2、拱圈监控工作为背景，利用MIDASCivil建立全桥空间分析模型，基于正装法计算出各拱段浇筑及张拉过程的理想结构参数，在误差允许范围内合理调整扣锚索的索力来调整悬臂结构的实际状态，再根据拱段实测参数修正监控计算模型，达到计算模型与实桥施工状态的统一。施工过程中对拱圈线形、扣索和锚索的索力、拱圈应力、临时塔位移等结构参数的监控结果表明，主拱圈各项参数控制良好，满足设计要求。关键词：箱形拱桥；悬臂浇筑；施工监控；施工阶段；扣索；锚索中图分类号：U448．223文献标志码：AConstructionMonitoringandControlofC

3、antileverCastingofArchRingofNewMidiBridgeinPanzhihuaZHANGDuo，HEWei，JIANGChang—jiang，YUANLin—yu(1．SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu610031，China；2．SchoolofCivilEngineering，TongJiUniversity，Shanghai200092，China)Abstract：TheNewMidiBridgeinPanzhihuai

4、saconcretearchbridgewithamainspan182mandthearchringofthebridgewasconstructedbythecantilevercastingmethod．Toensurethesafetyoftheconstructionprocessandthecorrectnessofthecompletedbridgestatus，thegeomet—ricshapes，cableforcesandstressofthebridgeatvariousconstructionstageswere

5、monitoredandcontrolled．Bywayofexampleoftheconstructionmonitoringandcontrolofthearchringoftheupstreamsidepart，theMIDASCivilwasusedtosetupthespatialanalysismodelforthewholebridgeofthebridge，theidealstructuralparametersofthecantilevercastingandtensioningprocessofeachsegmento

6、fthearchringwerecalculated，usingtheforwarditerationmethod．Withintheallowableerrorrange，thecableforcesofthefasteningandanchoringstayswerera—tionallyadjustedSOastoadjusttheactualstatusofthecantileverstructureandthecalculationmodelforthemonitoringandcontrolwasthenupdatedinac

7、cordancewiththemeasuredparame—tersofthesegmentsSOastomakethemodelagreewiththeactualconstructionstatus．There—sultsofthemonitoringandcontrolofthegeometricshapesofthearchring，cablesforcesofthefasteningandanchoringstays，stressofthearchringanddisplacementofthetemporarytowersin

8、theconstructionprocessshowthatallparametersofthearchringhavebeenwellcontrolledandcanmeetthedesig