南京大胜关长江大桥钢梁道碴槽施工技术

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1、8桥梁建设2010年第4期文章编号：1003—4722(2010)04—0008—03南京大胜关长江大桥钢梁道碴槽施工技术邹纪民，赵顺涛(中铁大桥局集团第四工程有限公司，江苏南京210031)摘要：南京大胜关长江大桥主桥4～l0号墩间为六跨连续钢桁拱，桥面系采用正交异性板整体道碴槽结构，综述道碴槽施工方案、工艺及关键技术措施。道碴槽采取双幅同步、分段施工，施工顺序为依次进行桥面板除锈清理、防腐涂装、剪力钉焊接、钢筋绑扎、底板与挡墙混凝土浇筑，然后施工底板沥青防水卷材和保护层混凝土。施工过程中采取

2、充分释放外加荷载、严格控制联测放线条件及防腐涂装环境、通过桥面现场施工模拟试验确定道碴槽施工工艺参数、通过试拌调整选定最优混凝土配合比等关键技术。施工完成的道碴槽外观质量好，有效防止了裂纹的产生。关键词：高速铁路；铁路桥；钢梁；道碴槽；施工工艺；施工技术中图分类号：U445．4文献标志码：AConstructionTechniquesforSteelGirderBallastTroughsofNanjingDashengguanChangjiangRiverBridgeZOUdi-min．ZHA

3、0Shun-tao(The4thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Nanjing210031，China)Abstract：ThemainbridgeofNanjingDashengguanChangjiangRiverBridgeonPiersNo．4～No．10isa6-spancontinuoussteeltrussarchbridgeandthefloorsystemofthebridgeisofthe

4、integralorthotropicplateballasttroughstructure．Asummarizedaccountoftheconstructionschemes，workmanshipandkeytechniquemeasuresfortheballasttroughsispresented．Thebal—lasttroughswereconstructedinawaythateachtwotroughswereconstructedsimultaneouslyinsectio

5、nsandtheconstructionsequencewasthatthedeckplateswererustedoffandcoatedforcor—rosionprotection，theshearstudswerewelded，thereinforcementwerebound，theconcreteforthebottomslabsandretainingwallswascast，thewaterproofasphaltrollersheetsandthecon—cretecoverf

6、orthebottomslabswereconstructedatlast．Intheconstructionprocess，aseriesofkeytechniqueswereapplied，whichincludedthattheexternalloadwasthoroughlyreleasedandthesetting—outconditionsaccordingtothejointsurveyandtheenvironmentalconditionsforcor—rosionprotec

7、tioncoatingwerestrictlycontrolled．Theworkmanshipparametersfortheconstrue—tionoftheballasttroughsweredeterminedthroughsimulationtestsofthefieldconstructionofthedeckandtheoptimalconcretemixproportioningwasadjustedandselectedthroughtrialmix—ing．Theappea

8、ranceandqualityofthecompletedballasttroughswereconsequentlyquitegoodandcracksintheconcretewereeffectivelyprevented．Keywords：high—speedrailway；railwaybridge；steelgirder；ballasttrough；workmanship；constructiontechnique收稿日期：2010—04—09作者简介：邹纪民(1972一)，男，高级