Download pdf - NEW PARALLEL RUNWAY DReDgINg & ReCLAMATION WORkS · In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation

In October 2013 construction of the New Parallel Runway (NPR) progressed to its next important stage – the Dredging and Reclamation works. Sand pumping was completed on 7 December 2014.

The DReDge VeSSel

• BrisbaneAirportCorporation(BAC)signedacontractwithJandeNul(Australia)PtyLtdinOctober2013,oneoftheworld’slargestandmostexperienceddredgingcontractors,toundertakethereclamationworksatthe360haNewParallelRunwaysiteatBrisbane Airport.

• JandeNulusedtheCharlesDarwintrailersuctionhopperdredge(TSHD),oneofthenewestinitsfleet,toundertaketheworks.

• TheCharlesDarwinusedpowerfulsuctiontubesequippedwithadragheadtodrawsandfromanapprovedsiteinMoretonBayintoits‘hopper’fortransportashore.

• OnceatitsmooringtheCharlesDarwinpumpedamixtureofsandandwaterthrougha4.5kilometrelongpipelinetothereclamation site.

• Thesiterequired11millioncubicmetresofsandtoraiseitabovetheone-in-100-yearfloodlevel.

Thepreparatoryworksincludedconstruction of:

• AtemporarydredgemooringintheBrisbane River;

• ApipelinetotherunwaysitecrossingtheLuggagePointWasteWaterTreatmentPlantlandandtheoperationalairfieldatBrisbane Airport;

• Theprimaryreclamationbund;and

• BMD,theCivilWorkscontractor,tocompletethesiteclearing.

The ReclamaTION

• Theareafilledisapproximately360ha-3600mlongandabout1000mwideandcurrentlysitsataroundsealevel.

• Thegroundlevelmustberaisedby3mfortheNPRtobefloodproofandimmunefromrisingsealevelsbroughtaboutbyclimatechange.

• Italsorequiresraisingtointegrateseamlesslywiththeexistingrunwayandtaxiwaysystem.

• TheunderlyingsoilsoftheNPRsiteareverysoftandextendto35mbelowground surface.

• Theapplicationofaheavyload(eg:sand)forcesmoistureoutofthesoilcausingthegroundleveltosinkastheearthisconsolidatedtoformastablefoundationfortherunway.Thisisknownas‘settlement’.Partsofthesitewillsinkbymorethan2m.

PROJecT UPDaTeMARCH2015

1.TheJandeNuldredge‘CharlesDarwin’completeditstaskofpumping11millioncubicmetresofsandashoretothereclamationsitenearlytwomonthsaheadofscheduleon7 December2014.

OVeRVIeW

ThisFactSheetprovidesinformationabouttheextensiveenvironmentalstudiesundertakenandtheenvironmentalmanagementwhichwasputinplacetomonitortheDredgingandReclamationworksforBrisbaneAirportCorporation’sNewParallelRunway(NPR)project.

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NEW PARALLEL RUNWAY

DReDgINg&ReCLAMATIONWORkS

about Brisbane airport: BrisbaneAirport(BNe),isthepremiergatewaytoQueenslandandthethirdlargestairportinAustraliabypassengernumbers.Operating24hoursaday,sevendaysaweek,BNehastwomajorterminalsservicing28airlinesflyingto41nationaland27internationaldestinations.Morethan22millionpassengerstravelledthroughtheairportin2014.BNewasnamedCapitalCityAirportoftheYearinthe2014AustralianAirportsAssociationNationalAwardsandratedasAustralia’sNo.1airportforqualityofservice10yearsinarowintheAustralianCompetitionandConsumerCommissions’annualsurvey.

Forinformationvisitwww.bne.com.auoremailinfo@bacmajorprojects.com.au

• geotechnicalinvestigationshaverevealedthatthesoilsvaryinstrengthovertheNPRfootprint.Sandwasstrategicallyplacedatvaryingheights,uptoamaximumof8mabovegroundleveloverthesoftestareas,toachieveasuitablyuniformgroundsettlementalongits3600mlength.

• geotechnicalmodellinghascalculatedthattoraisethesurfacelevelby3mandachievethenecessarysettlementwithinfouryears,upto11millioncubicmetresofsandwouldbe required.

• Toacceleratethesettlementprocess,330,000vertical‘wickdrains’wereinsertedintothegrounddownto35metresinthesoftestpartsofthesite.Thisallowedthemoisturetobedrawnfromthesoilmorequicklythanbytheactionofgravityalone.

• Thereclamationdesigninvolvedmorethan10,000kmofthesewickdrainsbeingspacedascloseasonemetreapartinthesoftest areas.

environmental management

• ThedredgingwascarriedoutwithinanareaadjacenttothemainshippingchannelinMoretonBay.

• BAChadafederallyapprovedConstructionenvironmentalManagementPlan(CeMP)inplacetomanageanyimpactsasidentifiedintheenvironmentalImpactStatementandMajorDevelopmentPlan(eIS/MDP)process.Referto:www.bne.com.au/corporate/upgrading-your-airport/new-parallel-runway/eismdp

• BACanditscontractorJandeNulhaddedicatedprofessionalenvironmentteamsinplacetoimplementtheapprovedCeMPandoverseearangeofsuccessfullyprovenenvironmentalmanagementstrategiesforbothonandoffairportland.

• Themostsignificantenvironmentalissuesincludedmonitoringofwaterqualityandbiodiversitybothonandoffairport.

• A24/7real-timemonitoringprogramwasinplaceoncethedredgecommencedworktoensureallwaterqualitylimitsweremetthroughoutthecourseoftheworks.

• Aprevioustrialdredgingin2008conductedattheNPRdredgesitedemonstratedthatnoharmfuleffectsoccurredintheenvironmentallysensitiveareaseithersideoftheextractionfootprint.

• Thesandwaspumpedtothesitethroughthepipelineinaslurrymixofwaterandsandinaratioofupto5:1.

• Thatmeansforeachloadof30,000m3ofsand,upto150,000m3ofwaterwasalsodeliveredtothereclamationsiteformanagementpriortorelease.

• ThewaterwastakenfromtheBrisbaneRiveratthemooringlocationandmixedwiththesandforpumpingpurposes.

• Thewaterwascontainedonsitewithintheprimaryreclamationbundandtail-waterpondsallowinganysedimenttosettleoutbeforebeingreleasedbackintothesystemviathenewmajordrainagechannelsconstructedaspartofearlycivilworks.

• Waterwasnotreleaseduntilestablishedwaterqualitydischargelimitsweremet.

• Dredgingandsandpumpingoperationswerecompletedon7December2014.

• Thesitewillnowbeallowedtosettleforfouryearstoprovideacompressedandstablebaseonwhichtobuild.

• TheNewParallelRunwayisscheduledtobecommissionedby2020.

2.Thewaterandsandmix(ratioof5:1)arrivesonsitefromthedredgesite.

3.Wickdrainswerepunchedintothesoftunderlyingsoildtoadepthofover30metrestohelpdrainthesite.

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Forinformationvisitwww.bne.com.auoremail:[email protected]