铜陵公铁两用长江大桥主桥施工关键技术

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1、桥梁建设2014年第44卷第4期(总第227期)BridgeConstruction，Vo1．44，No．4，2014(TotallyNo．227)文章编号：1003—4722(2014)04—0001—08铜陵公铁两用长江大桥主桥施工关键技术周外男(中铁大桥局集团有限公司，湖北武汉430050)摘要：铜陵公铁两用长江大桥主桥为主跨630m的五跨连续钢桁梁斜拉桥，三主桁三索面结构型式，采用钢绞线斜拉索。3号主墩采用沉井基础，下部钢沉井采用整节段工厂制造、整节段船舶运输、整节段浮态接高新技术，并通过球阀控制连通管快速注水定位着床；采

2、用贴面爆破法辅助沉井在卵石胶结地层中下沉。3片主桁均由全焊桁片拼装而成。桁片由工厂制造、在船舶上竖立存放运输。桁片在现场安装时，根据不同预拱度，采用“下弦杆结点一斜杆结点一上弦杆结点”和“上弦杆结点—+下弦结点一斜杆结点”两种顺序对接，以方便接头折角调整。跨中采用桁片式钢梁整体合龙。斜拉索单根钢绞线索力的均匀性采用等值张拉法和智能控制张拉系统进行控制，并通过群锚千斤顶张拉进行整柬索力调整。关键词：公路铁路两用桥；斜拉桥；钢桁梁；沉井；桁片结构；钢绞线斜拉索；等值张拉法；桥梁施工中图分类号：U448．27；U445．4文献标志码：A

3、KeyTechniquesforConstructionofMainBridgeofTonglingChangjiangRiverRail-。cam。_RoadBridgeZH0UⅥ，ni-nan(ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan430050，China)Abstract：ThemainbridgeofTonglingChangjiangRiverRail—cum—RoadBridgeisafive—spancontinuoussteeltrussgirde

4、rcable—stayedbridgewithamainspanof630m．Thebridgehasthestructuraltypeofthreemaintrussesandthreecableplanesandthestaycablessupportingthebridgearethesteelwirestrandcables．ThefoundationforthemainpierNo．3iSthecaissonfoun—dation，ofwhichthelowerpartsteelcaissonwasconstructed

5、，usingthenewtechniquesoffabri—catingthecaissoninfullliftsintheworkshop，transportinginfullliftsbyshipandextendingtheheightofthecaissOninfullliftsinthefloatingstate．Thesteelcaissonwaslandedontotheriver—bedandpositionedbyfastfillingwaterintothecaissonthroughtheconnection

6、pipescontrolledbyballva1vesandinthepebblecementitiousstratum，thecaissonwassunkdownwiththeaidofthesurfaceblastingmethod．Thethreemaintrusseswereal1assembledfromtheall—weldedtrussu—nits．ThetruSSunitswerefabricatedintheworkshop，storedinverticalpositionsonboardashipandtran

7、sportedbvtheship．Whenassembledinthefield，thetrussunitswereassembledaccord—ingtothedifferentcamberinginthetwosequencesofthelowerchordpanelpoints-+diagonalpan—elpoints--~upperchordpanelpointsandtheupperchordpanelpoints-+lowerchordpanelpointsdiagonalpanelpointstofacilita

8、tetheadjustingofthekinkinganglesofconnection．Atmidspans，thetrussunitsteelgirderswereclosedintegrally．Theforceuniformityofasi