IVIRIZU引水隧洞标段Google版（英语招标文件）

CONSTRUCTIONPROJECTHYDROELECTRICIVIRIZU

GROUP2:TUBELSOFADHESIONOFSEHUENCESANDSEALS,TOWEROFCAPTUREOFSEHUENCAS,

JOINTOFTAKINGOFJOINTS,ACCESSROUTES,SUPPLY,ASSEMBLY,SETTINGANDSTARTINGOF

HYDRO-MECHANICALEQUIPMENTANDINSTALLATIONSASSOCIATEDWITHSEHUENCESANDSEALS

ANDJOINTSCOMPLEMENTARY

TERMSANDCONDITIONS

CALLNOTICEEVH-C-04/2016

Rev.DescriptionAuthorreviewedApprovedDate

00FINALDOCUMENTFORGAFJ.VelascoA.Herbas11/15/2016

PUBLICATION

1421014-CN-G2-PC-001

H.Alarcon

J.Munoz

P.Diaz

CONTENTS

1GENERAL1

1.1BACKGROUND1

1.1.1DescriptionoftheIvirizuHydroelectricProject(StudyofFinalDesignandElaborationof

TenderDocuments)2

1.1.2Strategiccharacteroftheproject4

1.2Studyarea5

1.2.1Location5

1.2.2Descriptionofthebasin6

1.2.3Accessroutes7

1.3Purposeoftherecruitmentprocess8

2ScopeofConstruction8

2.1Generaldescriptionoftheworks.TunnelofSehuencas8

2.2GeneraldescriptionoftheworksChimneyofbalanceofSehuencas10

2.3Generaldescriptionoftheworks.TunneldeJuntas11

2.4BalancedfireplaceJoints12

2.5TowerofcaptureofSehuencas13

2.6WorksoftakingBoards15

2.7Vials29

2.8Additionalworks31

2.8.1Limitofcontractbetweencontractors39

3INFORMATIONOFTHEPUBLICINVITATIONPROCESS41

3.1Regulationsapplicabletotherecruitmentprocess41

3.2日igiblebidders41

3.3Administrativeactivitiespriortothesubmissionofproposals41

3.3.1Expressionsofinterest41

3.3.2Informationmeeting42

3.3.3PriorInspection42

3.3.4WrittenqueriesontheTERMSANDCONDITIONS42

3.3.5ClarificationMeeting42

3.4Amendments42

3.5Extensionofdeadlineforthesubmissionofproposals43

3.6Guaranteeofseriousnessofproposal43

3.6.1TypeofGuaranteerequired43

3.6.2ExecutionoftheProposalSeriousnessWarranty43

3.6.3ReturnoftheProposalSeriousWarranty44

3.7Rejectionanddisqualificationofproposals44

3.7.1Rejection44

3.7.2Causesofdisqualification44

3.8Subjectivityandnon-recoverableerrors46

3.8.1RecoverableErrors46

3.8.2Errorsnotrecoupable:47

3.9Deserteddeclaration47

3.10Cancellation,suspensionandcancellationofthecontractingprocess47

3.11Restrictedtoparticipateinthepublicinvitationprocess47

3.12Conflictofinterests49

4PREPARATIONOFTHEPROPOSALS49

4.1Currencyofthecontractingprocess49

4.2Costsofparticipationinthecontractingprocess49

4.3Language49

4.4Validityoftheproposal49

4.5Uniquechannelofcommunicationduringtherecruitmentprocess50

4.6Documentsoftheproposal50

4.7Additionalinformationforthepreliminaryassessment(minimumrequirements)52

4.7.1GeneralandSpecificMinimumExperienceoftheAccidentalCompanyorAssociation52

4.7.2GeneralandSpecificExperienceofManager,Superintendent,DirectorofWorkorOther52

4.7.3GeneralandSpecificExpertiseoftheSpecialistorSpecialists,whereappropriate53

4.7.4Minimumequipmentcommittedtothework53

4.7.5ExecutionSchedule54

4.7.6Teammobilizationschedule54

4.7.7FinancialSituation54

4.7.8Economicproposal56

4.7.9Technicalproposal56

5PRESENTATIONANDOPENINGOFPROPOSALS57

5.1Submissionofproposals57

5.1.1Formofpresentation57

5.1.2Deadlineandplaceofpresentation57

5.1.3Amendmentsandproposals

5.2Openingofproposals58

6EVALUATIONANDAWARDING59

6.1Preliminaryevaluation59

6.2Methodofselectionandadjudication:qualityandcost.59

6.2.1QualityAssessment59

6.2.2EvaluationoftheEconomicProposal64

6.2.3DeterminationofTotalScore66

6.3ScoreofAdditionalRequirementsAdjudicationordeclaratorydeserted66

6.4Concerningbettertechnicalandadministrativeconditions66

6.5Assignmenttonexthighestrated67

7TERMSANDCONDITIONSOFCONTRACT

7.1Subscriptionsandamendmentstothecontract67

7.1.1ContractContract67

7.1.2Modificationstothecontract68

7.2Penalties69

7.3Penaltyforsubstitutionofkeypersonnel69

7.4PercentagePermittedforSubcontracts69

7.5Constructioncamp70

7.6Contractor'sguarantees70

7.6.1GuaranteeofCompliance70

7.6.2CorrectGuaranteeofDownPayment70

7.6.3GuaranteeofGoodExecutionofWorks71

7.7Insurance71

7.7.1GeneralInsuranceRequirements71

7.7.2InsuranceofContractorWorksandEquipment72

7.7.3OtherInsurancetobeHeld72

7.8Deliveryofworkandclosingofcontract74

7.9Responsibilitiesandobligations75

7.9.1Contractor75

7.9.2TheSupervisor78

7.9.3ProjectAuditor78

7.10Verifiablemilestones78

7.11Paymentofadvanceandcertificatesofpaymentforprogressofwork79

7.11.1Amountofworks80

7.12Termofexecutionofworks80

7.13Maintenanceofworksuntilfinaldelivery81

7.14Interferenceandcoordinationwithothercontractors81

7.15CompliancewiththeIntegratedManagementSystem81

7.16Mitigationandpreventionmeasures82

7.16.1Plansandprograms83

8GLOSSARYOFTERMS84

9TECHNICALINFORMATIONONCONTRACTINGOFWORKS87

9.1Generalinformationontherecruitmentprocess87

9.2Generalinformationoftheconveningentity88

9.3Personneloftheentity88

9.4Timelineofthecontractingprocess88

9.5DocumentsattachedtothisPLEDGEOFCONDITIONS89

9.6Clauseofsuspensivecondition.89

PARTI

GENERALINFORMATIONTOTHEPROPONENTS

1GENERAL

1.1BACKGROUND

Inthe1950s,theBolivianCorporationforDevelopment(CBF)carriedoutthefirststudiesfortheuseofwater

resourcesintheIvirizuRiverBasin,forthepurposeofhydroelectricdevelopmentatanappropriatescale.Inthat

decadeapathofaccesswasenabledfromMontepuncutoSehuencas.

In1967,theNationalElectricityCompany(ENDE)enabledrainstationswithinthebasin,inthefollowingplaces:

SanErnesto,Sehuencas,Montepuncu,LopeMendozaandCoarispecifically,tomonitorthevariationof

precipitationintheareaofrisorIvirizuashidroel.ctricopurposesofexploitationofthisriver.

1975,ENDEstartmonitoringasectionofstreamgauginginahydraulicsectionintherisorIvirizu,attheplace

calledSehuencasstationlatersteptobeadministeredbytheNationalHydrologyServiceMeteorolog.ae

(SENAMHI).Thestationofcapacityofcaudaleswasdenominated"Kilometro20",becauseitwaslocatedtoa

distanceoftwentykilometersontheroadfromMontepuncu.Inthisseason,theywererecordeddailylevels

ofrisoruntil1984,plusthestage-dischargerelationshipwasdetermined.

In1991,ENDEstudythepossibilityofusingtheexistinghydroelectricpotentialinthisareathroughtwo

hydroelectricpowerplantscalledSehuencas1and2,thisprojecttookadvantageofthehydroelectricpotential

ofrisorIvirizu,espedficamentethesectionbetweentheconfluenceofthisriverwithrioStrongandits

confluencewiththerisorHuasamayudownstream,whichalsousedastoragereservoirlocatedimmediately

downstreamoftheconfluenceofrisorIvirizutheFuerteriver.

Additionally,inthesamestudyof1991,ENDEidentifiesthepotentialfortheinstallationofatotaloffour

additionalhydroelectricpowerplantsinthearea,twoinpassingontherisorHuasamayu(HuasamayuIandJ)

andtwowithregulationonthesamerisorIvirizu(IvirizuFandG);oltimasthesetwoplantswerelocated

downstreamoftheconfluenceofthisriverwithriorHuasamayu.

R\oStrong,LopeMendoza,Together,Ivirizu1,2andSehuencasIvirizu:2010,throughaprofilelevelstudy

contractedbyEVH,hydroelectricprojectswereidentified.

Theyear2011,EVHcontracttheservicesofanindividualconsultantforthedevelopmentofthepre-feasibility

studyoftheivirizuproject1.

AsofAugust2011,EVHhasbeenrecordingthedailyvariationofwaterlevelsinacontrolsectionlocatedonthe

ivirizuriver,approximately3kmupstreamofthe"km20"station.

FromDecember2014,EVHputintooperationaweatherstationintheareacalledSehuencasalsotwo

measuringstationsautomaticlevel,thefirstontherisorlopemendozawereinstalled,specificallyunderthe

highwaybridgeandthesecondinThesamestation"kilometer20".

InSeptember2014andSeptember2015,thefeasibilitystudyfortheUtilizationProjectBasinrisorIvirizu,inthe

sectionbetweenitsheadwatersinrisorLopeMendozaandtheconfluenceofrisisdevelopmentorIvirizuwith

theYanamayuriver,inchargeoftheMAUDAccidentalAssociation,formedbythecompaniesAINACTIVESL

andAINACTIVEBolivia.Theaimofthestudywastodeterminethetechnical,economic,socialand

environmentalfeasibilityoftheproposedusehydroelectricIvirizu,priorestablishmentofanoptimalsystem

utilizationofhydropowerpotentialalongtherisorIvirizu,whichincludestheinstallationoftwocentralof

generation,withfutureprojectionsofextensionincorporatingwaterbasinsvecinasdetheriversHuasaCristal

MayuandMayu.

1.1.1DescriptionoftheHydroelectricProjectIvirizu(StudyofFinalDesignandElaborationof

BiddingDocuments)

InSeptember2015andJune2016period,theFinalStudyDesignandpreparationoftenderdocumentsOptimo

SystemforhydroelectricityofrisorIvirizuwasdeveloped.

CasadeMaquinas

JUNTAS

deequilibrioJUNTAS

Campamento

JUNTASdeOperacidn

TomaJUNTASM

CasadeMaquinas

SEHUENCAS

moSE^UENCAS

TorreCaptacion

SEHUENCAS

Optimalsystemofnon-lvirizuHydroelectricuse-FinaldesignstudyandElaborationoftheTenderdocuments

EloptimalsystemforhydroelectricityofrisorIvirizuconsistsoftwocentral:CentralSehuencasandCentral

Boards,withatotalinstalledcapacityof279.9MW.Siendotechniquesofthecentralfeatures,thefollowing:

CENTRALCENTRAL

SEHUENCASJOINTSTOTAL

Flow(m3/s)26.532.5-

Netloss(m)811.6326.54-

Installedpower(MW)188.6291.26279.88

Averageannual

production(GWh)764.57354.491,119.05

I.InthereservoirofSehuencas,acatchmenttowerisdefined,fromwhichthebarrelstartsatalow

pressure,whichderivestheflowtothegallerateandtheforcedpipe,whichendsattheSehuencas

plant.Intheconnectionbetweenthetunnelandthearmoredgallerythereisachimneyofequilibrium.

II.ThecentralTogether,capturesthewatersofthemiddlebasinbetweenthereservoirandthework

Sehuencasmakingjointsthatareavailableatelevation1329.86m,immediatelyupstreamofthecentr

atSehuencas.Theresultingflowintheintake,aftersanding,isstoredonaraftof40,000m3of

volume.InthisrafttheturbineflowisalsoreceivedattheSehuencasplant,whichflowstotheraft

throughanaqueductabovetheIvirizuriver.

FromtheraftofJuntasleavesthetunnelthatderivestheflowtoturbineuntilthearmoredgalleryand

forcedlatuberiathatfinishesinthecentralone.Intheconnectionbetweenthetunnelandtheblindedgallery

thereisabalancingchimney.

Thetransmissionlinesassociatedwiththeproject:

•Gaskets-Sehuencas,230kV,2,9km.(ProvinceCarrasco)

•Sehuencas-PresaSehuencas,11.5kV,of7.6km(ProvinciaCarrasco)

•Sehuencas-futuraS/EMizque(interconnectionSTI),230kV,doubleternaof69.4km,forits

connectionwiththeSTI.

Theprojectwasdividedintofourgroupsforbiddingpurposes:

1.GROUP1.Damandattachedroadnetwork

2.GROUP2.Adductions,takeworksandannexedroadnetwork

3.GROUP3.Forcedpipes,machinehouses(includingelectromechanicalequipment)

4.GROUP4.Electricallinesandsubstations

ThisPUBLICINVITATIONincludestheconstructionofGROUP2,specificallyofcivilworkswhichinclude:

SEHUENCESADHESIONTUNNELS,SEHUENCESCAPTURETOWER,JOINTTAKINGJOBS,ACCESS

ROUTES,SUPPLY,ASSEMBLYANDSTARTUPTHEHYDRO-MECHANICALEQUIPMENTANDFACILITIES

ASSOCIATEDWITHSEHUENCESANDJOINTSANDCOMPLEMENTARYWORKS.

TheremainingworksuntilalltheIvirizuHydroelectricProjectwillbeexecutedbyothercontractors,withwhich

thecontractorofthisgroupmustworksimultaneouslyinthedifferentworkareas.

1.1.2Strategiccharacteroftheproject

Inordertoguaranteeuniversalaccesstoenergyasafundamentalrightandtheexportofsurplus,itis

establishedintheEPCofthePlurinationalStateofBoliviathattheStateshalldevelopandpromotetheresearch

anduseofnewformsofproductionofalternativeenergycompatiblewiththeconservationof

environment".(Art.379).Mandatethatisalsoendorsedinthe2025PatrioticAgenda.

Inaddition,LawNo.300Art.30statesthatoneofthebasesandguidelinesofLivingWell,throughintegral

developmentinenergyis:"ToensurethatapercentageofenergygenerationisincorporatedintotheNational

InterconnectedSystem(SIN)Fromalternativerenewableenergysources,whichwillbegraduallyincreased

steadily

WithinthepipelineofhydroelectricgenerationprojectsofthePlurinationalStateofBolivia-2025,formulatedin

2014,theincorporationoftheHydroelectricUtilizationProjectoftheIvirizuRiverBasinisplanned.Likewise,in

theexpansionplansofENDECorporation,itisplannedtostartcommercialoperationofthisprojectbytheend

oftheyear2020.

Likewise,theIvirizuprojectisincludedinthePDES2016-2020EconomicandSocialDevelopmentPlan,within

theframeworkoftheintegraldevelopmenttolivewelltowardsthe2025PatrioticAgenda,whichwasapproved

throughthepromulgationofLawNo.786OnMarch9,2016byPresidentEvoMoralesAyma.Accordingtothis

plan,theIvirizuprojectshouldbebuiltandinoperationbytheyear2020.

Finally,thelaw819ofJuly19,2016declaresofnationalinterestandpriorityprojectimplementation

HidroelectricoIvirizuinallitsstagestostartoperation.

TheProjecthastheEnvironmentalImpactStatement(DIA)031201/031203/031301/05/DIA/N07464/16and

theLicensingforActivitieswithHazardousSubstances(LASP)031201/031203/031301/05LASP/N07464/

16,issuedonNovember11,2016

1.2Studyarea

Hydrographically,thestudyareaistheUpperIvirizuRiverBasin,atributaryoftheChapareRiver,whichbelongs

totheAmazonBasinofBolivia.TheUpperRiverBasinoftheIvirizuRiverhasitssourcesontheNor-Eastslope

oftheEasternCordilleraoftheAndes,morespecificallyintheTiraqueRangeoftheDepartmentof

Cochabamba,withmaximumaltitudesoftheorderof4,300meters

ThemaintributariesthatcontributetothemaincourseoftheIvirizuRiverare:CoariRiver,HuayaPachaRiver,

LopeMendozaRiver,MontepuncuRiver,RioFuerte,PajchaMayuRiver,andHuasaMayuRiver.

1.2.1Location

Administratively,theareaIvirizuHydroelectricProject,islocatedintheDepartmentofCochabambaprovince

Carrasco(SeePlates01and02PGEAnnex1).

GeographicalSituationoftheStudyArea

TheIvirizuprojectareaisdelimitedbythefollowingcoordinates:

VertexNorthEast

DONOT255,507.38,078,040.6

HE263,642.88,062,475.5

UTM,WGS84Zone20

TheprojectareaislocatedwithindeloslimitsofCarrascoNationalPark.

1.2.2Descriptionofthebasin

ThebasinoftheriverIvirizuisbornonahighmountainintheCordilleraTiraque,whosedivisionisnearthe

ChariKhochalagoonatanapproximateelevationof4,300meters;Presentsavegetalcoverwith

preponderanceofPajonalesPunenosandPuyathickets,astheriveradvancesdownstream,thevegetation

changes,beingabletoobservevegetationofthetypeCejadeMontebetweenthe3100and3300msnm,ofthe

typeBosquesYunguenosMontanosapproximatelybetweenThe2200and3000msnmbecominginPalmares

YunguenosandHumidForestsbetweenthe1000and2200msnm;Finally,ofthetypeForestAmazonico

approximatelyfromthe1000msnm

ThebasinislocatedintheregionCordilleranaandSubandinaandischaracterizedbyitsmountain

physiographyofdeepvalleysandsteepslopes.

Theupperpartofthebasincorrespondstoadryclimateofinter-Andeanvalleyswhereevaporationishigher

thantheannualaverageprecipitationandwheretherearenopermanentwatercoursesandsparsevegetation,

inthemiddlepartthereisatemperatemesothoricclimatewithAveragetemperatureofthecoldestmonthof18°

Candabove-30Candthewarmestmonthabove10°C;Finally,inthelowerpartofthebasinhasahumid

tropicalclimatecharacterizedbyhavingatemperatureabove18℃everymonth,absenceofwinterandrainfall

allyearround.TheaverageannualtemperatureintheareaofIvirizuriveris19℃.

DuetotheextensionandgeographiclocationofthebasinoftheIvirizuriver,itpresentsinthebasinthermal

varieties,withcoldtotemperateclimateinthehighpartsofthesouthuntilwarminthelowerpartsofthenorth.

TheIvirizuRiverhasatotallengthof140.5km,hasalsoabasinwhoseaverageslopeis41%,reachingatotal

areaof2,375km2,fromitssourceinthefoothillsoftheCochabambamountainrangewiththenameofriver

LopeMendoza,nearthetownofMontepuncu,totheconfluencewiththeSanMateoriver.

ThisbasinbelongstotheriverMamore,whichispartoftheAmazonRiverbasin.Initsrouteitreceivesas

importanttributaries,amongothers,byitsrightmargintotheriverStrongandbytheleftmargintotheriverSan

Mateo,Juntas,JocoaraandHuasamayu.

TheIvirizuRiverduetoitsgeomorphologicalcharacteristicsisclassifiedastorrentoso,sinceitcorrespondstoa

watercourseofmountainareawithslopelongitudinal5%,thereforethistypeofwatercourseshavearapid

responsetorains,Areviolentandofshortduration.

Theaverageannualprecipitationinthebasinrangesfrom500mmintheupperpartand3,700mminthe

confluencezoneoftheIvirizuwiththePajchamayu.

TheaveragemonthlyflowestimadoenthefuturedamsitiodeSehuencasestheorderof19,57m3/sbeingthe

averageslopeoftheriverabout6.5%.

1.2.3Accessroutes

ThemaincourseoftheIvirizuesRiveraccessiblefromRouteNo.7oftheRoadFundamentalofBolivia,

CarreteroRoadCochabamba-SantaCruz,km118fromthecityofCochabamba,whereislocatedthetownof

Montepuncu,fromwhereindirectionNorthleavesAnaccessroadthatleadstothetownofSehuencas

approximately20kmaway.

ThismentionedaccesspathhasaparallelstroketothecoursesoftheMontepuncuandIvirizurivers

respectivelyuptointercepttheRioPajchaMayu,itisestimatedthattheapproximatelengthoftheaccessroad

currentlyconstructedismorethan30kmmeasuredfromtheroad,whichgraduallyexpandedstillheadingnorth

(seeplatePGE-3ofAnnex1).

1.3Purposeoftherecruitmentprocess

Tocontracttheservicesofaconstructioncompanyoraccidentalassociation(Contractor)toexecuteallthe

necessaryworkscorrespondingto:THECONSTRUCTIONANDEXECUTIONOFCIVILWORKSINCLUDING:

TUNELSOFADHESIONOFSEHUENCESANDSEALS,TOWEROFCAPTIONOFSEHUENCAS,WORKOF

TOMAOFJOINTS,ACCESSROUTES,SUPPLY,ASSEMBLY,ASSEMBLYANDCOMMISSIONINGOF

HYDROMECANICEQUIPMENTANDFACILITIESASSOCIATEDWITHSEHUENCESANDJOINTSAND

COMPLEMENTARYWORKS,ensuringthattherequirementsoftheprojectaredeterminedinPLIEGODE

CONDICIONES,applyinginduetimethemostStrictandrigoroustechnicalprocedurestoguarantee,asa

fundamentalpartoftheirwork,thequalityandquantityoftheactivitiesestablishedintheapprovedproposaland

intheexpectedperiods.

2ScopeofConstruction

2.1Generaldescriptionoftheworks.TunneldeSehuencas

Thebypassflowtoturbinar(26.5m3/s)fromthefeedbackisdonethroughatunneltothepenstockthatendsin

thebuildingoftheplant.Fromthesectionoftheclosinggateofthecapturetower,atransitionismadetothe

sectionofthetunnel,thistransitionhasalengthof6m.

Thehydraulicoperationofthetunnelisinlowpressure.

Thetunnelhasalengthof4.970mtotheequilibriumchimney.Thesectionishorseshoe-shapedwithafree

innersurfaceof12,50m2-

Themostsuitablemethodforitsexcavationisbymeansofdrill&blastwithprojectedconcretesupportand

metalbolts.

Image1.SectionofthetunnelofSehuencas

Thestartingpointofthetunnellevelis2,127,35snmandtheheightatthestartingpointoftheequilibrium

chimneyis2077.53m.Thetunnelhasaconstantslopeof1%.

Thesectionofthetunnelismadeofreinforcedconcrete,withathicknessof25cmofconcrete.

Thesectionbetweentheequilibriumchimneyandtheendofthetunneltotakeaccountofpossiblepressure

variationsiscoveredbyasteelsheettubewithstiffenersofvariablethicknessand3,000mmdiameter.Ithasa

lengthuptothebifurcationofthepipeof955,489mandaslopeof9%.

WithinthescopeofthisGroup2,theexcavationandmaintenanceofthesectionofthearmoredtunnel(between

thebalancingchimneyandthevalvestand),theGroup3contractorbeingresponsiblefortheprovisionand

installationofthecorrespondingsteelpipeTotheshielding,theconcreteliningandthecontactand

consolidationinjections.

Image2.Armoredtunnelsection

2.2GeneraldescriptionoftheworksChimneyofbalanceofSehuencas

Anequilibriumchimneywithadiameterof6.0mislocatedinthePK4.970ofthetunnelwithanelevationof

2,221,50m.a.s.l.

Theequilibriumchimneywillhaveatotalheightof137.70m,ofwhich132.20marebelowgroundleveland4m

abovetheslopeoftheesplanademadefortheexcavationofthechimney.

Thechimneyisconnectedtothetunnelbymeansofanelbowandatunnelbranchof3,000mmdiameter,with

concreteliningandsteelpipe.

Theaxisofthechimneyissetback17.0mfromtheaxisofthetunnel,definingtheunionbetweenthetwoby

meansofanelbow.Thisconnectingsectionisexecutedwithsteelpipeandislinedwithconcrete.

Foritsexecutionitisproposedtheexcavationofanopen-airesplanadeofdimensions15.0x25.0mandthe

level2,217.72mwithstableslopeformationat1:1V.

Finally,oncetheexcavationsequenceisfinishedtothebottomofthesame,thecoatingismadeby0.30mof

concretewithslidingformwork.

Theunionoftheaerialpartwiththesubwayismadebymeansofareinforcedconcreteconnection.

Theairsectionisconstructedwithaclimbingformworkanditisaconcretestructureofcircularsectionwith45

cmofthickness.

Image3.SectionoftheSehuencasequilibriumchimney

2.3Generaldescriptionoftheworks.Tune!OfBoards

ThediversiontunnelflowtoturbinesinthecentralMeetingbeginsattheraftTogether,atelevation1276.965m

anddecantedaflowrateof32.5m3/s.Ithasalengthof1,354,500mtotheequilibriumchimneyandafree

sectionintheformofahorseshoeof12.5m3/s.

Thehydraulicoperationofthetunnelisinlowpressure.

Thetunnelinplantisformedbythreestraightalignmentsbetweenwhichtheyaredesignedtworadiiof150and

500mrespectively.Inelevationithasaconstantslopeof2.2%.

Themostsuitablemethodforitsexcavationisbymeansofdrill&blastwithprojectedconcretesupportand

metalbolts.Asfinalinteriorfinishthetunnelthroughoutitslengthcarriesa25cmthickcoatingofreinforced

concrete.

Thestartingpointofthetunnelhearthis1,276,965maslandtheheightatthestartingpointoftheequilibrium

chimneyis1,246,995masl

Geologicallythetunnelalongitsroutecrossesarockymassifformedbylimolitesandsandstonesindifferent

proportions.

Themaximumcoverofthetunnelis235m.

Thesectionbetweentheequilibriumchimneyandtheendofthetunnel,totakeintoaccountthepossible

pressurevariationsproducedintheopeningandclosingmaneuversofturbines,isshieldedbyasteelsheet

tubewithstiffenersofvariablethicknessanddiameter3,000mm.Ithasalengthuptothebifurcationofthepipe

of73,017mandaslopeof2,213%.

IsinthescopeofworkofGroup2excavationandmaintenanceofthesectionofarmoredtunnel,butisnotunder

constructionorprovisionandinstallationofthepipe|acorrespondingsteelshielding,ortheliningofconcrete,

injectionscontactAndconsolidationinjections,whichw川beexecutedbytheGroup3contractor.

2.4FireplaceBalancingBoards

Anequilibriumchimneyof6,0mindiameter,withatotalheightof64.42m,ofwhich4,165mismadeonthe

platformofthegroundesplanadefortheconstruction.

Thechimneyisconnectedtothetunnelbyanelbowof3.00mindiameter.

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