高墩连续刚构桥长边跨现浇段施工方案比选.pdf

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1、桥梁建设２０１６年第４６卷第３期（总第２３８期）BridgeConstruction，Vol．４６，No．３，２０１６（TotallyNo．２３８）１１５文章编号：１００３－４７２２（２０１６）０３－０１１５－０５高墩连续刚构桥长边跨现浇段施工方案比选唐小富（湖南永龙高速公路建设开发有限公司，湖南永顺４１６７００）摘要：上坡米一号大桥主桥为（７２＋１２０＋１２０＋７２）m预应力混凝土连续刚构桥，主梁采用单箱单室截面，T构主梁采用挂篮悬臂浇筑施工。针对过渡墩高（６９．９１m）且边跨现浇段长（１１m）的特点，结合桥址处的地形条件，提出了墩顶吊

2、架施工（方案１）；先不对称浇筑、再合龙中跨、最后合龙边跨（方案２）；先合龙中跨、再不对称浇筑、最后合龙边跨（方案３）３种边跨现浇段施工方案，采用MIDASCivil软件建立全桥有限元模型，分析３种方案的关键截面应力、成桥线形和主墩偏移，并从适用性、安全性、经济性及工期等方面对３种方案进行综合比选，选择方案３。实践证明采用方案３施工，结构受力与变形合理，且施工适用性较强、安全性高、经济性好、工期短。关键词：刚构桥；箱形梁；挂篮施工；不对称施工；施工方案；有限元法；方案比选；桥梁施工中图分类号：U４４８．２３；U４４５．４文献标志码：ACom

3、parisonandSelectionofConstructionSchemesforLongCast‐in‐SituSegmentsofSideSpansofaHigh‐RisePierContinuousRigid‐FrameBridgeTANGXiaofu‐（HunanYonglongExpresswayConstructionandDevelopmentCo．，Ltd．，Yongshun４１６７００，China）Abstract：ThemainbridgeoftheShangpomiBridgeNo．１isaprestressed

4、concretecontinuousrigid‐framebridgewithspanarrangement（７２＋１２０＋１２０＋７２）m．Themaingirderofthebridgeisofthesingle‐cellsingle‐boxsectionandtheT‐framemaingirderwasconstructedbythecantilevercastingmethodbytheformtravelers．Inthelightofthecharacteristicsthatthetransitionpierofthebr

5、idgeishigh（６９．９１m）andthecast‐in‐suitsegmentsofthesidespansarelong（１１m）andinconsiderationofthetopographicconditionsatthebridgesite，３constructionschemesforthecast‐in‐suitsegmentswereproposed，i．e．thescheme１，theutilizationofthepier‐topliftingframes，thescheme２，theasymmetricall

6、ycastingofthesegmentsfirst，theclosingofthecentralspansthenandtheclosingofthesidespansfinallyandthescheme３，theclosingofthecentralspansfirst，theasymmetricallycastingofthesegmentsthenandtheclosingofthesidespansfinally．Thefiniteelementmodelforthewholebridgeofthebridgewasestab

7、lished，usingthesoftwareMIDASCivil，thestressinthecriticalsections，thegeometricshapesofthecompletedbridgeandtheoff‐settingofthemainpiersofthe３schemeswereanalyzed．The３schemeswerealsocomprehensivelycomparedfromaspectsoftheapplicability，safety，economyandconstructiontimeschedul

8、esandthescheme３wasfinallyselected．Practiceprovesthatwiththeselectedscheme３，thestructuralforcecon