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1、塞拉利昂水泥厂项目桩基施工方案CementterminalprojectpilefoundationconstructionprograminSierraLeone一、旋挖成孔灌注桩施工Rotarydrillingholepileconstruction1.工程量1000M3砼Theprojectamount1000M3concrete2.施工技术ConstructionTechnology本工程项目桩基施工采用旋挖成孔工程钻机,在施工前须对场地进行清表、清障、平整、压实,使场地表面耐力不小于100Kpa。施工时设置泥浆池、沉定池、泥浆循环系统和废浆池,沉淀池
2、的容积两倍于一根桩的体积,储浆池容积大于16m3,以满足钻孔需要。PileFoundationConstructionoftheprojectusearotarydrillingrig,beforeconstruction,weneedtoclearedthetable,wrecker,leveling,compactionvenuetomakesurethesurfaceenduranceisnotlessthan100Kpa.Duringconstruction,weneedtosetMudpools,sedimentationtanks,mudcircu
3、lationsystemandwasteslurrypond.Tomeetdrillingdemand,Sedimentationtankvolumeistwicethevolumeofapile,storageslurrypondvolumeshouldbegreaterthan16m33.工艺流程Process4.操作工艺Operationprocess(1)测量定位MeasurementPositioning(a)采用全站仪按照图纸测定位置并做好标色。Usetotalstationmeasurementpositioninaccordancewithth
4、edrawingsandmakeastandardcolor.(b)利用水准仪测定护筒标高其误差不大于10MM。LeveldeterminationCasingsforelevationoftheerrorshouldnotmorethan10MM(2)栓桩:桩位位置确定后,用两根相互垂直的十字线中心相交于桩点,并定出他的控制点,做好标识妥善保护。Boltpiles:oncepilesbitpositionisdetermined,weusetwomutuallyperpendicularcrosshairscenterintersectatthepilepo
5、int,sethiscontrolpointandmarkedproperlyprotected.(3)钻机就位:履带坐落的位置应平整,坡度不大于3度,避免因场地不平整产生动力损失,倾斜、位移,重心高时还会引起安全事故。Riginplace:Trackedlocatedpositionshouldbeflat,theslopeisnotgreaterthan3degreesandavoidvenueunevenlossofpower,tilt,displacement,highcenterofgravitywillalsocauseaccidents(4)对准
6、桩位:首先调整旋挖机的桅杆,使之处于垂直状态,让钻头对准桩点。AlignmentPile:Firstadjusttheaugermastinaverticalstateandthedrillbucketshouldbealignwiththepilepoint.(5)埋设护筒:定出十字控制点后,可采用钻机进行取土,钻至设计深度进行护筒埋设。Burycasing:setcrosscontrolpointtheweusetherigdigtheholeuntilthedepthwecanstarttoburythecasing.护筒采用厚度6mm的钢板制作而成,长
7、度在2m左右,护筒的直径为850mm,为防止钻进施工中护筒外圈返浆造成塌孔和护筒脱落,护筒底部应坐落在稳定的土层上,并且进入原土0.3-0.5m。护筒埋设位置应准确其中心点与桩定位点误差不大于50mm,并应保证护筒的垂度和水平度。Thecasingwasmadeby6mmthicksteelplate,thelengthshouldbearound2mandthecasingdiameteris850mm.InordertopreventtheoutertubeProtectionDrillingreturnedtothepulpcausedtheholeco
8、llapseandretainingb