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1、BAKUNHYROELECTRICPROJECT,MAINCIVILWORKSMAINDAMANDPOWERHOUSEEXCAVATION1.MAINDAMFOUNDATIONEXCAVATION1.1OBJECTIVEThemainobjectiveofthismethodstatementistodescribeindetailthesequenceofworksandestablishprioritiesofworktoallowembankmentfillingtostartbyscheduledin
2、thebaselineprogrammeon17-Jan-2003.Animmediateobjectivewillbetoexpediteworksandexposetheplinthatthedamfoundationforgeotechnicalinvestigation.Thismethodstatementandincludesthefollowing:·Haulroadsanddisposalareas,·Preparationofsecondaryrivercrossings,·Dewateri
3、ng,·Preparationofloadingplatform,and·Earth/rockexcavationforintegratedcofferdamfoundation.1.2ZONINGOFWORKAREAS:Fromthedrawing,‘bydrawingalineconnectingthehighestpointoftheridgesofbothleftandrightbanks,themaindamworkareaisdividedintothefollowingworkzones:·Ar
4、ea1:Fromdownstreamfaceofauxiliarycofferdamtothedamaxisofintegratedcofferdam;·Area2:Fromthedamaxisofintegratedcofferdamtothemaindamaxis,belowelevation130mfortherightbank,belowelevation140fortheleftbank,andincludingtheriverbed.·Area:Fromthemaindamaxistothedow
5、nstreamlimitofMainDam,belowelevation130mfortherightbank,belowelevation140fortheleftbank,andincludingtheriverbeddownstreamofMDAxis.··Area4:FromthedamaxisofintegratedcofferdamtodownstreamlimitoftheMainDam,aboveelevation130mfortherightbank,aboveelevation140for
6、theleftbank.Eachworkzoneisisfurtherdividedintosub-areas,eachsubdivisionisbasicallydefinedintoleftabutment,riverbedandrightabutmentsections.Pleaserefertodrawingno.MDEX-MS-001(Attachment1)Page9of9BAKUNHYROELECTRICPROJECT,MAINCIVILWORKSMAINDAMANDPOWERHOUSEEXCA
7、VATION1.1METHODOLOGY1.1.1PreparationofHaulRoads&DisposalAreas1.1.1.1HaulRoadsThefollowinghaulroadsshallbepreparedforhaulageofexcavatedmaterial:·RoadR1:Mainhaulroad·RoadR1-1:ConnectsrightabutmentatEL210toR1.·RoadR1-2:FromloadingplatformatRightAbutment@EL130,
8、totheupstreamfaceofauxiliarycofferdam,andconnectedtoR2atDownStream.·RoadR2:FromloadingplatformatRightAbutment@EL70,tothedisposalareasnearW4,andNorthernsideofW6.·RoadL2:FromriverbedEL50todisposalareasne
