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时间:2019-05-14
《铜陵公铁两用长江大桥钢桁梁全焊桁片制造技术》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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