公铁合建段公路大跨度钢箱梁施工技术

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1、桥梁建设2014年第44卷第2期(总第225期)96BridgeConstruction，Vo1．44，No．2，2014(TotallyNo．225)文章编号：1003—4722(2014)02—0096—05公铁合建段公路大跨度钢箱梁施工技术胡永生(中铁大桥局集团有限公司，湖北武汉430050)摘要：合福铁路铜陵长江大桥公铁合建段公路引桥(47．35+80+47．35)m三跨连续钢箱梁位于铁路桥面以上，分上、下游2幅，单幅采用单箱单室结构，顶板宽16．5m，腹板间距8．5m，两侧挑臂宽各4m。钢箱

2、梁离地面高度约52m，为超高空作业。在上游幅铁路梁面上设置拼装平台和滑移支架，钢箱梁在工厂分块制造，经水路运输、工地码头上岸和陆上运输至墩位，再通过墩位固定式架梁吊机起吊梁块至拼装平台上组拼成节段梁，经滑道纵移与前一梁段对接，下游幅钢箱梁经整体横移就位，将钢箱梁落于支座上，完成钢箱梁施工。该桥钢箱梁整个施工过程工序简便、安全可控。关键词：铁路公路两用桥；公路桥；钢箱梁；纵移；横移；架设施工；桥梁施工中图分类号：U448．121；U445．46文献标志码：AConstructionTechniquesf

3、orLongSpanRoadwaySteelBoxGirdersofRail--cam--RoadSectionofTonglingChangjiangRiverBridgeH【，Yong—sheng(ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan430050，China)Abstract：Thethree—spancontinuoussteelboxgirdersarrangedin(47．35+80+47．35)moftheroadway

4、approachbridgeoftherailcum—roadsectionofTonglingChangjiangRiverBridgeonHefei—FuzhouRailwayare1ocatedovertherailwaydecksandareseparatedintotwopartsofthegirdersoftheupstreamanddownstreamsides．Apartofthegirdersisthesingle—cellsingle—boxstructure．Thewidthof

5、thetopplateofthestructureis16．5m，thespacingbetweenthewebsis8．5mandthewidthofthecantileverofthetopplateoneachsideis4m．Theheightofthesteelboxgirdersfromthegroundisabout52mandtheconstructionofthegirdersisthereforeakindoftheworkdoneveryhighabovetheground．In

6、theconstructionofthegirders，theassemblingplatformandmovablescaffoldingswerearrangedontheupstreamsiderailwaydeck．Thegirdersweremanufacturedinblocksintheworkshop，transportedtotheconstructionsitebywater。un—loadedatthewharfatthesiteandagaintransportedonland

7、tothepiersites．Theblocksofthegirderswereliftedontotheassemblingplatformbythefixeddeckcraneatthepiersitewheretheywereassembledintotheincompletegirdersandthegirderswerelongitudinallyshiftedontheslipwayandconnectedwiththepreviouslyinstalledgirders．Thepatro

8、fthegirdersonthedown—streamsidewas1ateronintegrallyandtransverselyshiftedinplace。lowereddownontothebear—ingsandthusfar，theconstructionofthegirderswascompleted．Theworkingproceduresofthewholeconstructionprocessofthesteelboxgirderso