山区大跨度悬索桥钢桁梁施工技术

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1、桥梁建设2012年第卷第3期(总第213期)BridgeConstruction，Vo1．42，No．3，2012(TotallyNo．213)107文章编号：1003—4722(2012)03—0107—07山区大跨度悬索桥钢桁梁施工技术纪为详，陶路。’(1．贵州高速公路开发总公司，贵州贵阳550001；2．中铁大桥局集团桥科院有限公司湖北武汉430034；3．桥梁结构安全与健康湖北省重点实验室，湖北武汉430034)摘要：为解决山区大跨度悬索桥钢桁梁架设施工受地形条件限制的问题，以坝陵河大桥为背景，研究桥面吊机悬

2、臂架设法施工中不同区域的钢桁梁安装、钢桁梁合龙及钢桁梁提升等施工技术。首、次节梁段采用整体吊装施工，标准梁段及临时铰处梁段采用桁片吊装架设，并在临时铰处设置支撑系统(与钢桁梁铰接)；临时铰采用自然合龙，跨中钢桁梁合龙前调整竖向高差及上、下弦合龙口纵向相对偏差(暂不安装合龙口前端永久吊索)，合龙时在桥塔处牵引钢桁梁调整纵向偏差；单点提升力大于2400kN的梁段采用两点提升，其余梁段均采用单点提升。关键词：悬索桥；钢桁梁；桥面吊机；悬臂拼装架桥；施工技术；桥梁施工中图分类号：U448．25；U445．4文献标志码：ACo

3、nstructionTechniquesforSteelTrussGirderofLongSpanSuspensionBridgeinMountainousRegionjIWei—xiang．TAOLu'。(1．GuizhouExpresswayDevelopmentCorporation，Guiyang550001，China；2．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China；

4、3．KeyLaboratoryofBridgeStructureSafetyandHealthofHubeiProvince，Wuhan430034，China)Abstract：Tocopewiththeproblemthattheerectionofthesteeltrussgirderoflongspansuspensionbridgeinmountainousregionisrestrictedbythetopographicconditionsintheregion，theBalingRiverBridge

5、istakenasanexample，theconstructibntechniquesfortheerection，clo—sureandliftingofdifferentareasofthetrussgirder，usingthedeckcranecantilevererectionmethodarestudied．Accordingtothestudy，thefirstandsecondaryblocksofthegirdershouldbeintegrallyliftedandassembled，thety

6、picalblocksandtheblockatthetemporaryhingeshouldbeliftedandassembledineachtrussunitandthesupportsystem(hingedlyconnectedwiththegirder)shouldbeaccordinglyarrangedatthetemporaryhinge．Thetemporaryhingeshouldbeclosedinanaturalwayandbeforetheclosureofthemidspansteelt

7、russgirder。theverticalheightdifferencesandthelongitudinalrelativedeviationdifferencesatthegapsoftheupperandlowerchordsofthegirder(thefrontendpermanentsuspendersaretemporarilynotassembled)shouldbeadjusted．Atthetimeoftheclosure，thegirderistobehauledatthetowertoad

8、justthelongi—tudinaldeviationdifferences．Fortheblockswiththesingle—pointliftingforcegreaterthan2400kN，thetwo—pointliftingshouldbeappliedwhilefortherestoftheblocks，thesingle—