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1、4橋梁建設(shè)2010年第3期文章編號(hào):1003—4722(2010)03-0004~04鄭州黃河公鐵兩用橋主河槽承臺(tái)施工方案吳向軍(中鐵大橋局集團(tuán)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(tái)位于主河道內(nèi),通過(guò)對(duì)各橋墩承臺(tái)所處環(huán)境及施工時(shí)間段的不同進(jìn)行施工方案優(yōu)化,確定靠近主河道的主橋1號(hào)墩承臺(tái)采用插打鋼板樁、人工輔助開(kāi)挖、分層支護(hù)、局部深井降水、無(wú)需封底的施工方法;2,3,5號(hào)墩承臺(tái)采用插打鋼板樁圍堰、空壓機(jī)配合吸泥機(jī)清淤、灌注水下混凝土后抽水的施工方法;4號(hào)墩承臺(tái)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(hào)墩承臺(tái)采用在河道邊筑島、墩位外深井降水、基坑開(kāi)挖的方式進(jìn)行承臺(tái)施工;其余0號(hào)墩、7~12號(hào)灘地墩承臺(tái)采用常規(guī)的基坑開(kāi)挖配合深井降水施工。順利實(shí)現(xiàn)了該橋主河槽承臺(tái)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(tái);鋼板樁;圍堰;施工方案中圖分類號(hào):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(jiǎn)介:吳向軍(1967一),男,高級(jí)工程師,1988年畢業(yè)于長(zhǎng)沙鐵道學(xué)院鐵道工程專業(yè),I~:k(