铜陵公铁两用长江大桥钢桁梁全焊桁片制造技术

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1、桥梁建设2014年第44卷第1期(总第224期)BridgeConstruction，Vo1．44，No．1，2014(TotallyNo．224)文章编号：1003—4722(2014)01—0006—05铜陵公铁两用长江大桥钢桁梁全焊桁片制造技术鄢怀斌，郑自元，黄行裕(中铁科工集团有限公司，湖北武汉430066)摘要：铜陵公铁两用长江大桥主桥为(90+2404-6304-2404-90)m五跨连续钢桁梁斜拉桥。主梁采用3片主桁，N形桁架，3片主桁均为双节间全焊桁片结构，双节间全焊桁片长30m、宽2．85m、高18m，单榀

2、桁片最重360t，每榀桁片由上、下弦杆及腹杆全焊接而成。主桥钢桁梁采用双节间全焊桁片及上、下桥面板分块整体制造技术，为了保证桁片制造精度，全焊桁片采用“24-1”匹配制造技术，将桁片上(下)弦杆、竖腹杆及斜腹杆单件制造成型后再进行桁片总拼，3个全焊桁片在胎架上制造完后，其中前两个全焊桁片出胎，最后一个桁片移至前端作为母梁，匹配拼装后续桁片，直至全部匹配完成。目前，该桥钢桁梁已安装完成，制造精度满足规范要求。关键词：铁路公路两用桥；斜拉桥；钢桁梁；全焊桁片；焊接；制造技术；桥梁施工中图分类号：U448．27；U445．472文

3、献标志码：AManufacturingTechniquesforAll—-WeldedTrussUnitsofSteelGirderofTonglingChangjiangRiverRail-cam‘-RoadBridgeYANHuai—bin，ZHENGZi—yuan，HUANGXing—u(ChinaRailwayScienceandIndustryGroupCo．，Ltd．，Wuhan430066，China)Abstract：ThemainbridgeofTonglingChangjiangRiverRailcumR

4、oadBridgeisafivespancontinuoussteeltrussgirdercable—stayedbridgewithspanarrangement(90+2404-630+2404-90)m．Themaingirderofthebridgeiscomprisedof3N—shapemaintrussesandthetrussesareallofthetwo—pane1all—weldedtrussunitstructures．Atwo—paneltrussunitis3Omlong，2．85mwide，1

5、8mhighandtheheaviestunitweighs360t．Thetrussunitisformedbyweldingtheup—per，lowerchordsandwebmembers．Forthemanufacturingofthemaingirder，thetechniquesofmanufacturingthetwo—panelall——weldedtrussunitsandtheupperandlowerdeckplatesinblocksinintegrityareused．Toensuretheman

6、ufacturingaccuracyofatrussunit，thetechniqueofthe”2+1”matchmanufacturingisused．Afteraupperchord，lowerchord，verticalwebmemberandinclinedwebmemberoftheunitaremanufactured，theunitisthengenerallyassembled．3all—weldedtrussunitsaremanufacturedononejigstand．Whentheprevious

7、twounitsaremanufac—turedandmovedoutoftheiigstand，thelastunitismovedtothefrontandisusedastheparentgirder．thesuccessivetrussunitsarecontinuouslymatchassembleduntilallunitsareassembled．Presently，theerectionofthetrussgirderofthebridgehasbeencompletedandthemanufacturing

8、accuracyofthetrussgirdercanmeettherelevantrequirementsinthecodes．Keywords：rail—cum—roadbridge；cable—stayedbridge；steeltrussgirder；all—weldedtruss