排水渠施工方案

目录1、编制依据…………………………………………………………………………12、工程概况…………………………………………………………………………13、排水渠工艺流程…………………………………………………………………104、土石方工程………………………………………………………………………105、模板工程…………………………………………………………………………126、钢筋工程…………………………………………………………………………167、混凝土工程………………………………………………………………………268、钢架桥工程……………………………………………………………………349、工期保证措施……………………………………………………………………3710、安全生产保证措施………………………………………………………………3911、雨季施工措施……………………………………………………………………4012、质量保证措施及HSSE管理措施………………………………………………41排水渠施工方案1、编制依据1.1LusakaWaterSupplySanitationandDrainage(LWSSD)Project项目图纸1.2《城市防洪工程设计规范》（CJJ50-92）1.3《公路路基设计规范》（JTGD30-2004）1.4《水工混凝土结构设计规范》（SL/T191-96）1.5《给排水工程构筑物设计规范》（GB50069-2002）1.6《建筑地基处理技术规范》（JGJ79－2002）1.7《渠道防渗工程技术规程》（SL18－2004）1.8《水工建筑物抗震设计规范》（SL203-97）1.9《混凝土机构工程施工及验收规范》（GB5204-2002）1.10《室外排水设计规范》（GB50014-2006）1.11、《公路桥涵通用设计规范》1.12、《公路桥涵施工技术规范》（JTJ041-2000)1.13、《装配式公路钢桥多用途使用手册》（人民交通出版社）1.14、《桥梁施工工程师手册》（第二版）（人民交通出版社）1.15、我施工队自行组织的施工现场调查情况。2、工程概况2.1工程概述ClimateLusakafeaturesasubtropicalclimate,withfourseasons.WinterstartsinJuneandendsinAugust,leadingintothepre-rainyseasonwhichstretchesfromSeptembertoOctober.TherainyseasonstartsinNovemberandendsaroundMarch.AprilandMayconstitutethepostrainyseason.AccordingtothetwometeorologicalstationsinLusaka(oneatKennethKaundaInternationalAirportandtheotherattheCityAirport),theaverageannualrainfallintheLusakaareais820mm,whiletheaveragemonthlytemperaturerangesfrom15oCto31oC(recordedinJulyandOctoberrespectively)1.3climateTopographyThetopographyofLusakaischaracterisedbyaplateautothesouthandwestatanelevationof1,200m,withflat-toppedhillstothenorthandeastofthecityatanelevationofabout1,300mabovemeansealevel.Thecity’stopographyandmorphologyhavebeenlargelyinfluencedbytheunderlyinggeology.Theflat-toppedhillsareprobablyremnantsofaCretaceouspeneplain.Dolomitesandlimestonesformtypicalkarrenfeldtopographyoutcropsintheflatlyingarea,whereasschistsandquartzitesunderliemorebroken,hillycountry,theolderquartzitesinparticularformingextensiveridgesseveralhundredfeethigh.Schist-dolomiteboundariesarenormallyindicatedbysteepdownwardslopesfromschisttodolomite.1.4topographyGeologyThecityofLusakaislargelybuiltonmarble,generallyreferredtobythelocalgeologyastheLusakaDolomite.TheBasementComplexoftheLusakaareaconsistspredominantlyofgraniticgneissesandquartziteswithsubordinatecalcareousandsemicalcareoushorizons.Alateshearfoliationhasnormallydestroyedallstructuresrelatedtoearlierfoldingandusuallypostdatesthegranitisationofthegneisses.Thisshearfoliationhasbeenrefolded.Youngerrocks,probablyofKatangaage,havebeenfoldedatleasttwice.Thefirstphaseproducedtightrecumbentshearfolds,astrongaxial-planecleavageinschistoserocksandtectonicbandingincarbonaterocks.Refoldingtoagreatextentdeterminesthepresentcomplexoutcroppatternandisalsoresponsiblefortheminorpuckeringandaccompanyingstrainslipcleavagecommonlydevelopedinschists.Itobscuresthetruestratigraphicsequence.TheschistsoftheChungaFormation,whichnormallyoverlietheBasementComplex,areofhighergradethanthoseinterbeddedwiththecarbonatehorizonsoftheChetaFormation.SoilsandVegetationThegeologicalformationhasinfluencedthesoilandvegetationtypesinLusaka.ThefourdiscerniblesoiltypesaresummarisedintheFigurebelow.Figure1-1:SoilTypesHydrologyThecentralLusakaareaisdrainedbytheNgwerereStreamthatinturnflowsintotheKafueRiverwhicheventuallyjoinstheZambeziRiver.TheKafueRiveroriginatesattheeasternendoftheZambezi-ZairewatershedintheCopperbeltProvince,andflowsinasouth-easterlydirectiontoapointnearKitwe.Itthenturnssouthwardsorsouth-westwardsandflowsintotheItezhi-tezhiDamreservoir.AfterwardsitturnseastwardsandflowsacrosstheKafueFlatsandintotheKafueGorgeDamreservoir.Fromthehydropowerstation,itflowsthroughthesteepKafueGorgebeforedischargingintotheZambeziRivernearChirundu.Theriverdropsthroughaheightof570moveradistanceof64kmatanaverageriverbedslopeof1in110.Thedensityoftributariesishighinthenorthernpartsofthebasin,andreducesinthesouthernpart.Stormwaterrun-offinthecentralandnorthernpartsoftheNgwereredrainagebasinthatarethesubjectoftheseWorksislargelyasaresultofintensethunderstormactivityofshortduration.DuetotheunderlyingschistsandextensivesurfacecoveroftarmacandconcreteintheCBDinparticular,suchpeakrun-offoccursinarapidresponsetorainfallandcanoccuratanytimebetweenOctoberandAprilalthoughitisusuallyatitspeakinDecemberandJanuary.Furthersouthintheperi-urbanpartsofthecatchmentthatoverliekarst,stormrun-offofanysignificanceisusuallyconfinedtothelatterpartsoftherainyseasonbetweenFebruaryandAprilandexhibitsbothalesserpeakandalongerdurationthanfurthernorth,resultingfromthegroundwatertablerisingclosetooronoccasionsevenabovethegroundsurface.HydrogeologyTheLusakaKarstaquiferandthecarbonaterocksoftheChetaFormationareofspecialinterestwithregardtogroundwateroutflow.ThefigurebelowshowssomerelevantdetailsaboutthedistributionofthecarbonaterocksoftheKatangaFormationintheproject1.7hydrogeologyFigure2-1:LusakageologyTheremainingrocksoftheLusakaArea-mainlydifferenttypesofschistoftheChetaandChungaFormation-aremoreorlessimpermeableforgroundwater.Onlyincaseofintercalatedquartziteandcarbonaterockso