公安长江公铁两用特大桥非通航孔钢桁梁架设技术.pdf

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1、桥梁建设２０１７年第４７卷第２期（总第２４３期）１１２BridgeConstruction，Vol．４７，No．２，２０１７（TotallyNo．２４３）文章编号：１００３－４７２２（２０１７）０２－０１１２－０５公安长江公铁两用特大桥非通航孔钢桁梁架设技术季强（中铁大桥局集团第四工程有限公司，江苏南京２１００３１）摘要：公安长江公铁两用特大桥非通航孔（６～１０号墩）采用４×９４．５m连续钢桁梁结构，连续钢桁梁采用双片主桁结构，主桁中心距１４．０m、桁高１３．０m、节间距１３．５m，共２８个节间，主桁弦

2、杆采用焊接整体节点，上、下弦杆在节点外采用高强度螺栓拼接。通过对钢桁梁架设方法研究，并结合工程特点及现场情况，该桥非通航孔钢桁梁采用WD７０型全回转架梁吊机散拼法安装，在１０号墩后方（公安侧）设置架梁拼装支架，自１０号墩向６号墩方向逐节间、逐孔架设钢桁梁。其中，９号至１０号墩间钢桁梁采用膺架法拼装；８号至９号墩间钢桁梁采用半悬臂拼装架设法拼装；６～８号墩间钢桁梁采用全悬臂拼装法拼装。该桥钢桁梁于２０１５年９月１日完成，架设过程质量安全可控，架设后钢桁梁线形良好，满足设计要求。关键词：公路铁路两用桥；钢桁

3、梁；整体节点；膺架法；悬臂拼装法；临时支架；桥梁施工中图分类号：U４４５．４６６；U４４８．１２１文献标志码：AErectionTechniquesforContinuousSteelTrussGirderofNon‐NavigableSpansofGong′anChangjiangRiverRail‐cum‐RoadBridgeJIQiang（The４thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Nanjing２１００３１，

4、China）Abstract：Thenon‐navigablespans（PiersNo．６～No．１０）ofGong′anChangjiangRiverRail‐cum‐RoadBridgearethecontinuoussteeltrussgirderstructurewithspanarrangement４×９４．５m．Thesteeltrussgirderofthebridgeismadeupofthedoublemaintrusses．Thec／cdistanceofthemaintrusse

5、sis１４．０m，theheightis１３．０m，thepanellengthis１３．５mandthemaintrussesaretotallydividedinto２８panels．Thepanelpointsforthechordsofthemaintrussesaretheweldedintegralpanelpointsandtheupperandlowerchordsarerespectivelysplicedbythehigh‐strengthboltsoutsidethepoints．

6、Intheerectionofthetrussgirder，throughthestudyoftheerectionmethodsandinconsiderationoftheconstructioncharacteristicsandconstructionconditionsatthesite，itwasdeterminedthatthetrussgirderwastobeassembledpiecebypiece，usingtheWD７０fullslewingdeckcranes．Atthebac

7、kofthePierNo．１０（Gong′anSide），theassemblingscaffold‐ingswerearranged，thetrussgirderwaserectedpanelbypanelandspanbyspanfromthePiersNo．１０toNo．６，ofwhichthetrussgirderoverthePiersNo．９andNo．１０waserected，usingthescaffoldingassemblingmethod，thetrussgirderoverthe

8、PiersNo．８andNo．９waserected，usingthesemi‐cantileverassemblingmethodandthetrussgirderoverthePiersNo．６～No．８waserec‐ted，usingthefullcantileverassemblingmethod．TheerectionofthetrussgirderofthebridgewascompletedonSeptember１，２０１５