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1、4橋梁建設(shè)2010年第3期文章編號:1003—4722(2010)03-0004~04鄭州黃河公鐵兩用橋主河槽承臺施工方案吳向軍(中鐵大橋局集團第一工程有限公司,河南鄭州450053)摘要:鄭州黃河公鐵兩用橋主橋承臺位于主河道內(nèi),通過對各橋墩承臺所處環(huán)境及施工時間段的不同進行施工方案優(yōu)化,確定靠近主河道的主橋1號墩承臺采用插打鋼板樁、人工輔助開挖、分層支護、局部深井降水、無需封底的施工方法;2,3,5號墩承臺采用插打鋼板樁圍堰、空壓機配合吸泥機清淤、灌注水下混凝土后抽水的施工方法;4號墩承臺采用插打鋼板樁圍堰基坑內(nèi)
2、抽水,底部干封混凝土的施工方法;6號墩承臺采用在河道邊筑島、墩位外深井降水、基坑開挖的方式進行承臺施工;其余0號墩、7~12號灘地墩承臺采用常規(guī)的基坑開挖配合深井降水施工。順利實現(xiàn)了該橋主河槽承臺施工,取得了很好的綜合效果。關(guān)鍵詞:公路鐵路兩用橋;承臺;鋼板樁;圍堰;施工方案中圖分類號:U443.25文獻(xiàn)標(biāo)志碼:AConstructionSchemesforPileCapsofZhengzhouHuangheRiverRail--cam。-RoadBridgeinMainRiverChannelW【,Xiang—j
3、un(The1stEngineeringCo.,Ltd.,ChinaRailwayMajorBridgeEngineeringGroup,Zhengzhou450053。China)Abstract:ThepilecapsofthemainbridgeofZhengzhouHuangheRiverRail—cum—RoadBridgearelocatedinthemainriverchanne1.Throughoptimizationoftheconstructionschemesforthepilecapsacc
4、ordingtothedifferentenvironmentandconstructiontimeschedules,itwasdeterminedthatthepilecapofpierNo.1closetothemainrivercoursewastobeconstructedbythemethodofinsertinganddrivingsteelsheetpiles,excavatingfoundationpitintheaidofmanu—alwork,laggingthepitlayerbylayer
5、,deep—welldewateringlocallyandnotsealingthebase.ThepilecapsofpiersNo.2,No.3andNo.5weretobeconstructedbyinsertinganddrivingsteelsheetpiles,airliftingandclearingoffmudbyaircompressorsandpumpingoutwateraftertremieconcretewascast.ThepilecapofpierNo.4wastobeconstru
6、ctedbyinsertinganddrivingsteelsheetpilesandpumpingoutwaterfromfoundationpitandsealingthebasewithconcreteindrycondition.ThepilecapofpierNo.6wastobeconstructedbybuildinganartificialislandatthesideoftherivercourse,deep—welldewateringoutsidethepierlocationandexcav
7、atingfoundationpitandthepilecapsoftherestoftheshoalpiersNo.0,No.7~12weretobeconstructedbytheroutinemethodofexcavatingfoundationpitsanddeep—welldewatering.Withthedifferentmeth—odsmentionedabove,theconstructionofthepilecapsofallpiersweresmoothlycompletedandveryg
8、oodcomprehensiveeffectwasachieved.Keywords:rail—cum—roadbridge;pilecap;steelsheetpile;cofferdam;constructionscheme收稿Et期:2010~01—25作者簡介:吳向軍(1967一),男,高級工程師,1988年畢業(yè)于長沙鐵道學(xué)院鐵道工程專業(yè),I~:k(