dredging and marine works

TA B L E O F CON T E N T S

1 Introduction

2 DredgingandMarineWorks

2.1 CapitalDredgingandPortExtensionWorks

2.2 MaintenanceDredging

2.3 LandReclamation

2.4 RockRevetment

2.5 OffshoreServices

2.6 PortInfrastructureWorks

2.7 SalvageWorks

3 OtherActivitiesofJanDeNulGroup

3.1 CivilWorks

3.2 EnvironmentalWorks

4 SupportingServices

4.1 EngineeringDepartment(StabilityCADMXGraphicSupport)

4.2 Survey

4.3 Fleet

4.4 DryEquipment

OfficeJanDeNulNV-Aalst(Belgium)

Architect:D

r.Ir.Philip

peSa

myn-Lierm

an&Lierm

an

2

1 I N T rOduC T I ON

JanDeNulGroupisaworldplayerforCivilEngineering,DredgingandMarine-

relatedandEnvironmentalProjects.Bothinthedesignandexecutionphasethe

keyactivitiesareexecutedbythecompanysin-houseengineersusingourown

equipment.BycombiningsuchdiverseactivitiesJanDeNulGroupcanofferan

overallpackageandexecutelarge-scaleprojectsfromstarttofinish.

Nexttoourtechnicalexpertise,thefinancialstrengthofJanDeNulGroupisalsoa

majorasset.

JanDeNul,asacompany,wasestablishedin1938asaCivilEngineering

ConstructionCompanyandthankstothepioneeringentrepreneurialspiritofthe

DeNulfamilythefirstdredgingprojectonitsownaccountwasexecutedin1951.

Sincethen,theCompanystartedtofocusonthismarketsegmentandwassoon

awardeditsfirstinternationaldredgingproject.Today,JanDeNulGroupranksat

thetopoftheinternationaldredgingindustryandwithitsforwardroilingexpansion

policywithrespecttoitsnewdredgingfleetcapacity,isunequalled.

JanDeNulGroupexecutesdredging,reclamationandmarine-relatedworks,of

anykind,sizeornature,including:

Capitaldredgingandmaintenanceworksinports,harbours,rivers,etc;

Reclamationofportsandindustrialareas;

Rockdredginginopenseaconditions;

Dredgingofshoreapproachesandtrenchesforoffshorepipelinesandoutfalls;

Sandwavedredginginopensea(pre-sweeping);

Pipelinestabilizationandprotectionbyrockdumping;

Coastaldefencebymeansofbeachreplenishment;

Oilrecoveryandcleansingoperations;

Dredging,treatmentanddisposalofcontaminatedsoils;

Specializedalternativedredgingmethodstoreduceoravoidtheenvironmental

impactofmarine-relatedworks.

Salvageandheavylifting.

Moreinformationistobefoundonwww.jandenul.com

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2 d r E dg I Ng ANd mA r I N E WOr k S

Acomprehensiveupdatedlistofreferenceprojects,classifiedperactivitywillbe

foundonwww.jandenul.com

2.1 CApITAL drEdgINg ANd pOrT ExTENSION WOrkS

CapitalDredgingandPortExtensionWorksentailthecreationofneworthe

deepening,wideningorenlargingofexistingaccesschannels,swingingbasins

andharbourdocks.

Capitaldredgingandportextensionworksareofgreateconomicsignificanceas

aresultoftheexpansionofworldtradewhichrequiresand/orforcesallportsto

increasetheircapacity.Eitherexistingharbourbasinsandaccesschannelsare

deepenedorcompletelynewharboursarecreatedtoreceivelargercommercial

vessels.Mostnewharboursaredevelopedinordertomeettheeverincreasing

demandforrawmaterialsandtheexpandingworldtrade.Forprimaryrawmaterials

suchascoal,ironoreandotherbasicmetalsandfortheoilandgastradenew

specialisedharboursarenowbuiltallovertheworld.

InAustralia,JanDeNulGroupisexpandingwhatisnowalreadythecountrys

largestironoreexportingharbourinPortHedland.Theexportcapacityhasto

bedoubledin2yearstimerequiringahugedeepeningoftheexistingharbour

area.

InNewCaledoniatheconstructionwasstartedofacompletelynewharbour

forspecificallyoneproduct,namelynickel.Thisharbourwillaccomodate8%

oftheworldsdemandfornickel.

InBelgium,theWesternScheldtwasdeepenedtoimprovetheaccesstothe

PortofAntwerpfortheeverincreasingssizeofcontainerships.

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PilbaraIronOreInfrastructureProject-PortHedland(Australia)Dredgingworksandlandreclamation-CutterSuctionDredgerLeonardodaVinci

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Capital DreDging andport extension Works

PortHedland-Australia

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PanamaCanal-Panama

Koniambo-NewCaledonia

Montevideo-Uruguay J.F.J.DeNul-CutterSuctionDredger

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2.2 mAINTENANCE drEdgINg

MaintenanceDredgingconsistsoftheremovalofsedimentationtomaintain

therequireddepthofwaterways,channelsandports.

Maintenancedredgingworksarethemosttraditionaldredgingprojectsand

becauseofthatarenodoubtalsotheleastconspicuousbranchofJanDeNuls

dredgingactivities.However,thistypeofworksdideventuallyleadtothedevelop-

mentofthetrailingsuctionhopperdredgerandisofvitalimportancetoharbours.

NotonlyinBelgium,butalsoworldwide,large-scalemaintenancecontractsareput

outtotender.JanDeNulGrouphasaverydiversefleetofmoderntrailingsuction

hopperdredgers,enablingittoexecutemaintenancedredgingprojectsevenin

fairlyshallowwaters.Thelargestprojectsofarundertakenisundoubtedlythe

maintenanceoftheRoParaninArgentina,whereJanDeNulGroupis

maintainingtheriveroveralengthof800km.

Theongoing18-yearcapitalandmaintenancedredgingcontractfortheRo

ParanandRodelaPlatainArgentina,increasesthenavigabilityoftheriver

soastoprovideimprovedcommunicationsandtradeopportunitiesfor

Argentinasinlandriverconurbations.Thisprojectextendsoverapproximately

800kilometresfromtheentranceofthePortofSantaFeontheRoParanup

toPuntaIndio,km240ontheRiodelaPlata.

InthePortofHamburg,maintenancedredgingworkshastobeexecutedat

regularintervalsassedimentationfromtheriverElbewouldotherwisesiltup

theport.PartofthedredgedmaterialisdumpedintheNorthSeaasthe

storagecapacityfordredgedspoilintheportofHamburgislimited.Such

maintenanceworksareexecutedusinglargetrailingsuctionhopperdredgers.

ToensuregoodaccesstothePortofAntwerp,twotothreetrailingsuction

hopperdredgersarecontinuouslydredgingtheScheldt.Thecurrentcontract

withaconcessionperiodof7yearsalsoprovidesforthedeepeningofthe

WesternScheldtandtheSeaScheldt.TheScheldtisanextremelybusyriver,

whichtogetherwiththealternatingcurrentsmakesthisdredgingprojectan

extremelychallengingone.Everyyear,about10millionmofsandandsludge

isdredgedandre-dumpedinplaceswheretheriveriseroding.Occasionally,

dredgespoilisalsoreclaimedonshore.

AlsointheNorthSeanavigationchannelsaremaintainedattheirproperdepth

byJanDeNulGroup.Thesedredgingworksmaintainthedepthofboththe

navigationchannelinopenseatotheScheldtandthattotheportsofZee-

bruggeandOstend.AlsodredgingintheZeebruggeandOstendportsis

carriedout.Thedredgespoilmainlyconsistsofsludgeandisdumpedinto

dumpingsitesintheNorthSea.

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RoParanandRodelaPlataWaterwayConcession-ArgentinaMaintenancedredgingworks-TrailingSuctionHopperDredgerFrancisBeaufort

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MaintenanCe dredging

PuertodelaPlata-Argentina

RoParan-Argentina

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CoastalPortsZeebruggeandOstend-Belgium

WesternScheldt-Belgium

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2.3 LANd rECLAmATION

LandReclamationinvolvesthecreationoflandoverwaterbyutilisingsand

dredgedfromtheseaforcoastalprotectionand/ortocreateareasforresi-

dential,recreationalorindustrialpurposes.Asubcategoryoflandreclamation

isbeachreplenishment,wheresandisplacedonexistingbeachestoprevent

orfighterosion.

LandreclamationprojectsarenodoubtJanDeNulsmoststrikingactivity.Located

atthecoastofDubai,forinstance,hugeamountsofsandhavebeenreclaimed

since2002fortheconstructionofPalmIslandII(JebelAli)andtheWaterfront

Project.TorealisethePalmJebelAliIslandandWaterfrontprojects,inallabout

500millionm3ofsandhasbeenreclaimed.Thisequatestoarowoftrucksencircling

theearthabout22times.ElsewhereintheworldJanDeNulGrouphasexecuted

landreclamationprojects,forexampleinRasLaffan(Qatar),SoyoLNG(Angola),

PulauUbinandPulauTekong(Singapore),Sfax(Tunisia),SaadiyatIsland(AbuDhabi)

andManifa(SaudiArabia).

PalmJebelAliIslandandtheWaterfrontProjectinDubai.PalmJebelAliIsland

isanislandintheformofapalmtreewithadiameterof4kmprotectedbya

17kmlongbreakwater.FortheWaterfrontProject7islandsarereclaimed

aroundPalmJebelAli.Inanareaof2,300hectaremorethan300millionmof

sandwillhavebeenreclaimed.Thisproject,mainlyexecutedbytrailersuction

hopperdredgers,willtakeapproximatelysixyearstocomplete.Thefirstisland

willtake18monthstoconstruct.

Theaptlynameddredgingcontractofthe20thcentury,thereclamationworks

forthenewinternationalairportofChekLapKokinHongKong.JanDeNul

Group,asamemberofaninternationalConsortiumofdredgingandcivil

engineeringconstructioncompanies,successfullyexecutedandmanagedthis

projectwithintheagreedtimelimits.ThisProject(dredgingandreclaimingof

237millionm)wasatthetimethebiggestreclamationprojecteverexecuted.

Mostoftheworldslargestdredgingvesselsweredeployedonit.

AnimportantbeachreplenishmentreferenceistheprojectinCancn,Mexico,

wherebeacheshadbeenfullyerodedbecauseofthedamagecausedbythe

tropicalstormWilma.ForthecoastalareafeaturingCancnshotels,about

2.8millionmofsandwasreclaimedforrestoringthebeach.

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PalmJebelAliIsland-Dubai(U.A.E.)Dredgingworks,landreclamationandrockrevetment-TrailingSuctionHopperDredgerAlexandervonHumboldt

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lanD reclamation

PalmJebelAliIsland-Dubai(U.A.E.) PalmJebelAliIsland-Dubai(U.A.E.)

PalmJebelAliIsland-Dubai(U.A.E.)

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PalmJebelAliIsland-Dubai(U.A.E.) Waterfront-Dubai(U.A.E.)

Waterfront-Dubai(U.A.E.)

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lanD reclamation

PulauTekong-Singapore

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ChekLapKok-HongKong

SaadiyatIsland-AbuDhabi(U.A.E.)

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lanD reclamation

Cancn-Mexico

Cancn-MexicoCancn-Mexico

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DeHaan-Belgium

Texel-TheNetherlands

Sylt-Germany Sylt-Germany

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2.4 rOCk rEvETmENT

RockRevetmentisappliedtoprotectshoresagainsttidalandwaveactions.

Inlandreclamationprojects,firstabreakwaterisformedwiththesupplied

rocksmarkingoutthecircumferenceoftheisland.Subsequently,theisland

itselfisreclaimedwithsandusingvarioustechniques.Withinthescopeof

portinfrastructureworksitconcernsmainlytheconstructionofbreakwaters

orshoreprotection.

JanDeNulGroupfirstengagedinthisactivityinSingapore(constructionofthe

islandsPulauUbinandPulauTekong)andsubsequentlyperfecteditsskillsinDubai

(PalmJebelAliIslandandJebelAliNewContainerTerminal).Thisactivityhas

becomeanindispensablelinkinmanylarge-scaleprojects.Rockrevetmentis

alsobeingappliedinDubai(WaterfrontandNewIslandDevelopment),Abu

Dhabi(Saadiyat)andSaudiArabia(Manifa).Thesignificanceofthisactivityisalso

highlightedbytheinvestmentindryequipmentandsplithopperbargesoverthe

lastfewyears.

PalmJebelAliIslandandtheWaterfrontProjectinDubai.The17branchesof

PalmJebelAliareeach2.5kilometreslongandareprotectedagainsttherough

seabyabreakwaterof17kmlongand350metreswide.Forthe7islandsofthe

WaterfrontProject12millionmofrockwillberequiredtoprotectthecoastline

againsterosion.Forbothprojectsatotalof40milliontonnesofrockare

needed.Thisquantityrepresents2milliontruckloads.

InSingapore,atotalareaof1,400hectarewillbecreatedusingsandand

dumpedclayforexpandingtheislandofTekonginordertomeetthegrowing

demandforbuildingland.Thenewlyformedlandwillincreasethecoastlineby

some13.3kilometres,which,incomparison,isaboutonefifthoftheBelgian

coast.Toprotectthesenewshores,1.6milliontonnesofrockweredumped

overasurfaceof100hectare,equivalentto125footballpitches.Thisshore

protectionwasappliedinwaterdepthsofupto25m.

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NewContainerTerminal-Dubai(U.A.E.)Dredgingworks,landreclamationandrockrevetment

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roCk revetment

PalmJebelAliIsland-Dubai(U.A.E.)

NewContainerTerminal-Dubai(U.A.E.)

PalmJebelAliIsland-Dubai(U.A.E.)

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PulauTekong-Singapore

PulauTekong-SingaporeNewContainerTerminal-Dubai(U.A.E.)

NewContainerTerminal-Dubai(U.A.E.)

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2.5 OFFShOrE SErvICES

SpecialisedServicesfortheoffshoreoilandgasindustriesinclude,among

others,thedredgingofshoreapproachesforoffshorepipelinesincluding

theinstallationofcofferdams,rockdumpingandseabedlevellingforthe

installationofpipelines,loweringofoilandgaspipelinesinseabedtrenches,

backfillingofpipelineswithstoneandrock,stabilisingofoilrigsthroughrock

dumpingandballastsandtheexcavationofso-namedGloryHoles.

Thespecificrequirementsoftheoffshoreindustryrequirespecialisedequipment

andJanDeNulGrouphas,butnotlimitedto,trailingsuctionhopperdredgers

equippedwithdeepdredgingfacilitiesforwaterdepthsofupto155m,rock

cuttersuctiondredgers,dynamicallypositioned(side)stone-dumpingvesselsand

backhoedredgersinitsfleet,forsuchwork.

TheconstructionoftheManifaFieldCausewayandIslandsinSaudiArabia.

This1billiondollarcontractisoneofthelargestdredgingcontractsawarded

inrecentyears.Theprojectincludesthedesignandconstructionofa41km

longmaincausewayinopenseaandassociatedsecondarycausewaysthat

willprovidevehicleandserviceaccessto25drilling/productionislandsand

2waterinjectionislands.Theprojectalsocoversthedesignandconstruction

ofbridges,berths,roll-on/roll-offfacilitiesandtheremovalofexistingunder-

waterpipelines.Inall,morethan10milliontonnesofrockisexcavatedfrom

thedeserttoprotectthereclaimedislandsagainststormsprotectionwhich

willlastfor100years.JanDeNulisresponsibleforboththedesignandthe

construction(EPC)ofthisproject.

JanDeNulGroupalsobroughtanextremelycomplexdredgingprojectto

asuccessfulclose:theso-namedGloryHolesinCanada.Theseworkswere

executedintheAtlanticOcean,about350kmeastofNewfoundland,ata

dredgingdepthofover130minstiffclaywithboulders.Theprojectspurpose

wastoprotecttheunderwaterdrillinginstallationsagainstthescouringof

icebergsovertheseabed.

OneofJanDeNulGroupsmorestrikingoffshoreprojectsweretheactivities

aroundthedistantislandofSakhalinadjacenttotheEast-Siberiancoast,in

veryheavyseaconditions.Atlocationsabout1000kmawayfromtheinhabited

worldtrenchesweredredgedintheseabedandbackfilledtoprotectpipelines

againstthescouringoficefloesovertheseabed.Forthelandfallsattheshore

cofferdamswerebuiltattemperaturesdownto30belowzeroinhard-frozen

soil.Attheendoftheworkingseason,rockrevetmentwasconstructedaround

theoilrigsbeforetheseawasfrozenover.

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ManifaFieldCausewayandIslandConstructionProject-Manifa(Saudi-Arabia)Designandconstructionof27reclaimedislands,connectingroadsandbridges

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offshore services

Manifa-SaudiArabia Manifa-SaudiArabia

Manifa-SaudiArabia

Manifa-SaudiArabia

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MontagneJacquot-Mauritius NORFRAPipeline-France

NORFRAPipeline-France

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offshore services

Sakhalin-Russia Langeled-England

Langeled-England

Langeled-England

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OffshorePipeline-Taiwan AdriaticLNG-Italy

GloryHoles-Canada

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2.6 pOrT INFrASTruCTurE WOrkS

Moreandmore,PortInfrastructureWorksareputouttotenderandawardedthroughall-

incontracts,includingdesignandengineering.Thecustomerentrustseverythingtothe

contractor.Thistrendwasboostedin2005bytheawardingofsomeofthelargestdredging

contractsevertoJanDeNulGroup,includingtheJebelAliNewContainerTerminalin

DubaiandtheRasLaffanPortExpansionProjectinQatar.

ThankstoitsmultidisciplinaryapproachJanDeNulisabletocombineallofitsactivitiesfor

thiskindoflarge-scaleproject,whichthecompanycandelivertothecustomerwithinthe

presetandrequiredtimeframes.

TheextensionoftheexistingLNG-portatRasLaffaninQatar.This2billiondollar

contractentailsthedredgingof20millionmoflimestone,thereclamationof

25millionmofsand,thedeliveryanddumpingof18milliontonnesofrockand

theproductionandinstallationof1millionmofconcreteblocksfortheconstruction

ofbreakwaterstoprotectthenewharbour.Oncompletion,RasLaffanwillbecome

theworldsbiggestLNG-port.

ThedevelopmentoftheJebelAliContainerTerminalinDubai.ThisProjectconsistsof

thedeepeningoftheportbasin(dredgingof23millionmofmaterial),thedredging

ofatrenchfortheconstructionofafuturequaywall,theconstructionofabreakwater

usingquarrystonesandshoreprotectionoveradistanceof9km(totalamountof

rock:2.5millionm),8millionmofearthmovingandtheconstructionofa1.7kmlong

dynamicbreakwaterforthesafemooringofvessels.

NewContainerTerminal-Dubai(U.A.E.)

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2.7 SALvAgE WOrkS

Earlyin1995,anexistingjointventurebetweenfourleadingBelgianmarinecontractors,

includingJanDeNulNVandT.V.Bergingswerken(TVB),wasrestructuredasScaldis

Salvage&MarineContractorsNV

Scaldisprovidessalvage,wreckremovalandmarinecontractingservicesthroughout

NorthwestEuropeandelsewhereintheworld.

TheScaldisfleetincludestheocean-goingheavyliftcatamaranRambizwithalifting

capacityof4,000tonnesandtheNorma,afloatingshearlegswithaliftingcapacityof

440tonnes.

TheCompanyshistoryincludesamongstotherstheremovaloftheMontLouis,lostoff

Ostendin1984,andthere-floatingoftheferryHeraldofFreeEnterprise,whichcapsized

offZeebruggein1987.Scaldishasalsobeeninvolvedwithmajorheavyliftandmarine

contractingworks,includingthenewTagusBridgeVascodaGamainPortugal,which

wasopenedforEXPO98.

Scaldisbringsitstechnicalexpertisetoeachtaskundertaken,thusensuringasafe

workingenvironmentandtheprotectionofthemarineenvironmentatalltimes.

Rambiz-Salvagevesselwithliftingcapacityof4,000tonnes

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port infrastruCture Works

CallaoTerminal-Peru

PortofDuqm-Oman

Durban-SouthAfrica

32

LeonardodaVinci-CutterSuctionDredgerNewPortofCoega-SouthAfrica

RasLaffan-Qatar

Montevideo-Uruguay

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3 OThEr ACTIvITIES OF JAN dE NuL grOup

3.1 CIvIL WOrkS

CivilEngineeringWorks,thatswhereitallstartedforthecompanyofJanDeNul

anditremainsanimportantpartofitsactivities,whichcanfocusondifficultand

complexprojects.Tothisend,JanDeNulGrouphassetupaninternalstructured

systemofferingcustomersanoverall,tailor-madepackage.Fromdesigntocom-

pletion,allkeyactivitiesareexecutedbyqualifiedengineersandbyusingequip-

mentofthegroup,whethertheprojectconcernsbuildings,watertreatmentplants,

sewagesystemsandpipelines,quaywalls,tunnels,bridges,roadsorlocks.

Thisapproach,combinedwithitsvasttechnicalexpertiseandmanyyearsof

experience,ensuresthatJanDeNulGroupis,inBelgium,amongthemarket

leadersforcivilengineeringworks.Thankstoitsfinancialstrength,thegroupalso

featuresstronglyinthemarketoflarge-scalePPC-projects.Thisresultsinthe

constructionof,amongstotherlargecontracts,thewatertreatmentplantBrussels

North(Europeslargest),theairportterminalinZaventemandtheconcerthallin

Bruges.

Moreinformationonourcivilengineeringactivities

istobefoundintheCivilWorksbrochure

Thomasm.r.Depaepe

34

3.2 ENvIrONmENTAL WOrkS

Soilandgroundwaterremediation,sludgetreatment,environmentaldredging

andtheprocessingofotherspecificwastesubstances:Envisanhasexperience

inenvironmentalworksofallkinds.Themultidisciplinaryteamhasawidescope

ofremediationmethodsatitsdisposal.Herealso,JanDeNulGroupensuresan

integratedapproach,fromdesigntocompletion,usingitsownequipmentand

evenitsownprocessingcentres.Innovationandresearchanddevelopmentare

crucialtoEnvisansoastoofferitscustomerscreativeandcompetitivesolutions

totheirindividualproblems.Envisanhasdevelopedintotheidealpartnerfor

complexremediationprojectsandfortheremediationofoldlandfillsandthisis

bothonnationalandinternationallevels.

MoreinformationonEnvisanistobefound

intheEnvironmentalWorksbrochure

HappyDay-J.L.Burnod

35

4 S u p pO r T I Ng S E r v I C E S

4.1 ENgINEErINg dEpArTmENT (STABILITy CAd mx grAphIC SuppOrT)

Evermoreclientsareseekinganoverallsolutionfortheirbuildingplanswithan

integratedapproachofdesignandexecution.JanDeNulGrouprecognised

thistrendsometimeagoandstartedsettingupafullyfledged,professional

engineeringdepartment.Theintegrationofitsspecificexpertiseinboththe

designandexecutionphasescreatesconsiderableaddedvalueresultinginmore

economicandsaferbuildingprojects,increaseofqualityandameticulouscontrol

ofanyrisksinvolved.

TheengineeringdepartmentofJanDeNulGroupconsistsofasizableteamof

specialisedexperts,qualifiedengineers,designersanddraftsmenandhasstate-of-

the-artsoft-andhardwareatitsdisposal.

Theexpertiseoftheengineeringdepartmentinclude:

Studyandtheintegrateddesignofallkindsofconstructionsinconcrete,steel

andwood;

Geotechnicaldesigninallitsaspects;

Drainageanddewateringofsub-structurefoundationsoil;

Integrateddesignofmarineinfrastructureincludingwaveactioncalculations;

Designoflarge-scaleearthworks,optimisingandfollow-up;

Comparativestudyoftheexecutionmethodsforalltypesofproject.

Complexprojectsrequirethoroughpreparationsandintensivecommunication.

WithintheengineeringdepartmentateamworkswiththeprogrammeMXto

calculateallsoilquantitiesin3D,thiswayoptimisingmajorcontracts(earth

moving,dredgingworks,roads,railroads,etc.).BothfromtheCAD-andMX-teams

informationispassedontothe3Dvisualisationteam,wherethevariousphasesof

aprojectorprocesscanbevisualised.

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RasLaffanPortExpansionProject-RasLaffan(Qatar)Dredging,landreclamationandrockrevetmentworks-Designofbreakwaters

37

4.2 SurvEy

Inordertobeabletochartitsdredgingprojectsandlargeinfrastructureworksin

anaccuratemannerandtofollowthemuppromptlyandefficiently,JanDeNul

Grouphassetupitsownsurveydivision,whichincludethefollowingtasks:

Theaccurateindicationofthelocationandlevel(height/depth)ofthe

workareabasedontopographicalandhydrographicalmeasuringmethods

(before,duringandaftertheworks);

Presentationofthemeasuringresultsandcalculationofdredgedquantities;

Settingupandmaintainingpositioningandvisualisationsystemsondredging

vesselssothattheoperatorcanworkverypreciselyusingadigitaltopo-

graphicalmodelorsoilprofile.

ThesurveydivisionofJanDeNulconsistsofasizableteamofexpertsand

engineersdeployedonvariousprojectsworldwide.Inordertomeettheever

stricterdemandsofcustomers,thedivisionhasstate-of-theart,high-tech

measuringequipmentforhydrographicalandtopographicalmeasurementsatits

disposal.Theteamalsomonitorscloselyallrecenttechnologicaldevelopments

andteststhemoutinpreparationforfuturechallengesinthedredgingand

offshoreindustry.

Executingmarine-relatedbuildingprojectsinanecologicalandsustainable

manner

Asworldwideenvironmentalconcernsarebecomingincreasinglyimportant,

JanDeNulareconstantlyaskedtodecreasetheimpactofdredgingworkson

thewatercolumnandthesurroundingmarineenvironment.JanDeNulGroup

recognisesboththenecessityofthecurrentstrictlimitationsimposedondredging

andlandreclamationprojectsandtheimpactofsomedredgingactivitiesonthe

marineenvironment.

AsaninternationalcompanycommittedtotheenvironmentJanDeNulGroup

isinvolvedinmarine-relatedbuildingprojectsallovertheworld,applyingstrict

standardsconcerningthedisposalanddiffusionofpollutedsubstances.For

theseprojectsextensivesurveytechniquesareappliedtomonitorthedredging

andinstallationprocesses.Thisknowhowisusedinourpermanenteffortsto

developoperatingtechniquesthatcanbeevenmoreefficientandenvironmentally

friendlier.

38

Ourcommitmenttotheenvironmentisdemonstratedat3levels:

Ourverymodernfleetofsea-goingvesselsandlandequipmentmeetsthe

strictestinternationalenvironmentalstandards;

Ourmarineenvironmentteamcloselymonitorsenvironment-relatedissues

duringthevariousphasesofaproject(tenderphase,mobilisationphaseand

implementationoftheenvironmentalpolicyplan);

Envisan,asubsidiarycompanyofJanDeNulGroup,specialisesinremediation

worksforthetreatmentofhistoricalpollution.

Environmentalcriteriaareproject-related.Ifrequired,aspecificenvironmental

managementreportisproducedforaproject.Byimplementingthisspecific

environmentalmanagementandpolicyplanoneveryproject,JanDeNulaimsto

executemarine-relatedbuildingprojectsinanecologicalandsustainablemanner.

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4.3 FLEET

Trailingsuctionhopperdredgers

aremostlyusedfordredgingloosematerial

suchassand,clayorgravel.Tothisend,

oneortwosuctiontubesequippedwitha

dragheadthatistrailedovertheground

arelowered.Throughapumpsystem

thesandandwatermixtureissuckedin

andstoredinthehopperorwellofthe

vessel.Oncefullyloaded,thevesselsails

totheunloadingsitewherethematerial

canbedumpedthroughitsbottomdoors

orbereclaimedusingtherainbowing

technique.Theon-sitepumpingofthe

sandusingafloatingpipelineisanother

frequentlyusedunloadingtechnique.

Cuttersuctiondredgersareequipped

witharotatingcutterheadcuttinghard

soilintofragments.Thecutsoilisthen

suckedinbydredgepumps.Cuttersuction

dredgersaremostlystationarysuction

dredgersthatcutthesoilaccordingtoa

pre-setprofile.Thematerialisthenpum-

pedashoreusingpumpsandafloating

pipelineorloadedintoasplithopperbarge

mooredalongside,whichinturncanthen

dumpthedredgespoilatthesetlocation.

Backhoedredgersareaverycommon

typeofdredgingmachinewhichisusually

notself-propelled.Themostimportantpart

ofthemachineisthehydraulicexcavator

dredgingfromapontoon.TheBackacter

istheworldslargestdredgingexcavator

withatotallynew,stronglyimproved

excavationconcept.

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JanDeNulsdredgingfleetisthemostmodernandmostdiverseintheworld.The

Companypolicyfocusesoninvestinginnewvesselsandequipmentandontheuse

ofinnovativeandmoderntechnology.

Tobeabletomeetthegrowingdemand,JanDeNulGroupcontinuestoinvest

intheexpansionofitsfleet.TheGroupsownDesignandEngineeringdivision

designsnewvesselsinhouse,whicharethenbuiltinvariousshipyardsalloverthe

world.JanDeNulGroupalsodeliverstherequiredspecificdredgingequipment

totheshipyard,whichisauniquefeatureinthedredgingindustry.Thisdredging

equipmentisdesignedandengineeredwithintheCompanyandthenfabricated

andassembledintheCompanysworkshopsinAalst.Thankstoaninvestment

programmeof1.8billionEuro(coveringaperiodupto2011)thefleetnow

consistingof42vesselswhichwillbeexpandedwithanother20newvessels.

41

4.4 dry EquIpmENT

JanDeNulGroupadherestoapolicyofinvestmentinitsownequipmentand,asa

result,ithasatitsdisposalacomprehensiverangeofmodernequipmentcovering

thewholespectrumofspecialisedequipmentneededforrealisingprojectsinthe

industriesitisactivein.

Atthismoment,JanDeNulownesmorethan450heavymachinesandthisnumber

willincreaseyearbyyear.Atpresentthisincludes:

Floatingequipmentforexecutinghydraulicengineeringworks;

Rammingequipment:cranes,monkeys,pneumaticpicks;

Equipmentfordryearthmovingworks:cranes,dumpers,bulldozers;

Buildingcranes:pillarcranes,cablecranes,telescopiccranes;

Equipmentforroadconstruction:graders,roadrollers;

Topographicalequipment:sitepositioningsystemsGPS,totalstation.

JanDeNulGroupalsoinvestsinspecificequipmentneededforexecutingone

particularcontract,examplesofwhichareabucket-wheelexcavatorforearth-

movingworksortheStarfish,anamphibiousexcavatorthat,thankstotheraised

locationofengineandcabin,canworkinwatersthatareonlyafewmetresdeep.

Finally,JanDeNulGrouphasitsownmaintenanceandrepairworkshopaswellas

astate-of-the-artmetalprocessingdivisionthatcanexecutethemostcomplicated

turning,millingandweldingworks.

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DumpingLorryVolvoA40D

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Deze brochure is ook verkrijgbaar in het Nederlands

Cette brochure est galement disponible en franais

Este folleto tambin est disponible en espaol

Questa brochure disponibile anche in italiano

Responsible editor: Jan De Nul Group

Correspondence address: 34-36, Parc dActivits Capellen, 8308 Capellen, Luxembourg

dredging and marine works

JAN DE NUL Nv

Tragel 60 I 9308 Hofstade-Aalst I Belgium

T +32 53 73 17 11

F +32 53 78 17 60 I +32 53 77 28 55

info@jandenul.com I www.jandenul.com