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1、作业指导书编号:施工单位旋喷桩施工二队工程名称杭州地铁二号线一期工程SG2-1标段分部工程南部卧城站围护结构交底部位南部卧城站围护结构基底加固桩日期2010年8月8日交底内容一、工程概况南部卧城站为地下二层岛式车站,地下一层为站厅层,地下二层为站台层。车站起点里程SDK1+458.375,有效站台中心里程SDK1+539.025,车站终点里程SDK1+657.625,全长199.25m,结构外包尺寸18.5×12.71m。车站顶板覆土厚度近期1~1.4m,远期约2m,车站标准段基坑开挖深度约13.91m,车站端头井段
2、基坑开挖深度约15.61m,围护结构采用800厚地下连续墙+钢筋混凝土(或Φ609钢管)内支撑,车站采用明挖顺作法施工。车站南接朝阳村站,南端头为盾构调头;北接潘水路站,北端头为盾构始发/到达。南部卧城站主体围护结构分三期施工,其中一期施工南部卧城站主体结构部分的旋喷桩共246根,围护结构也采用旋喷桩做止水帷幕。据此,对端头加固桩位进行详细排列,详见附图1双管旋喷基底加固桩桩位布置图。为便于桩位的测量、标识、记录,拟对以上桩位按行编号,编号方式为1-1、1-2……2-1、2-2……3-1、3-2……305-1、305
3、-2。旋喷桩施工时采用32.5级普通硅酸盐水泥,水灰比为1:0.8桩体深度见标高交底(如有图纸变更,再另行通知)。其咬接形式见附图1旋喷桩间关系大样图。二、工艺概述高压dslopetofacilitateemptying.(1)duringtheexcavationprocess,feelfreetocheckthestatusofsideslope,verticaldigdepthisgreaterthan1.5M,accordingtothechangesofsoil,excavation(Groove)ortr
4、enchsupportpreparation,topreventcollapse.(2)excavation(Groove)andwhenthetrenchshouldnotdigtothedesignheightofthefollowing,ifnotexactlydiggingbaseelevationistodesign,persistenceofelevationabovealayerofsoilisnotdug,tocopyafterpingdugoutbyhand.(3)mechanicalconstru
5、ctiondigintotheEarth,diggingmanualatanytime,andtrolleystotransportEarthmachinerytodigtheplace,soastousethemachineryofcherry-picking.5,trimming...(1)soilexcavationonarainyday,theirworkshouldnotbetoolarge,shouldbedonepiecemeal,bystaging.(2)therainatthetimeofconst
6、ructionintheexcavationandearth-movingrequiredgreatattentiontoslopestability.Ifnecessary,theappropriateslowslope,orbraces,whileinthepits(Groove)outsidesurroundedbyEarthenbermsordiggingditches,preventsurfacewaterfromentering.Alwayscheckontheslope,support,anembank
7、ment,identifyproblemsanddealwith.II,backfillEngineering(a)constructionpreparationresearchfieldsiteformation,earthfillconstructionplan,determinethefillline,order,range,slope,drainagelevels,andsoon.1,theengineeringaccordingtothecharacteristicsofspecies,densityoft
8、hefillquantityrequirements,constructionsiteconditionsofreasonablefillsoilmoisturecontrol,virtualshopandcompactionparameters,suchasnumber.2,undergroundandabove-groundpipeline