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Land reclaimation
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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
3
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.
4
PilbaraIronOreInfrastructureProject-PortHedland(Australia)Dredgingworksandlandreclamation-CutterSuctionDredgerLeonardodaVinci
5
Capital DreDging andport extension Works
PortHedland-Australia
6
PanamaCanal-Panama
Koniambo-NewCaledonia
Montevideo-Uruguay J.F.J.DeNul-CutterSuctionDredger
7
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.
8
RoParanandRodelaPlataWaterwayConcession-ArgentinaMaintenancedredgingworks-TrailingSuctionHopperDredgerFrancisBeaufort
9
MaintenanCe dredging
PuertodelaPlata-Argentina
RoParan-Argentina
10
CoastalPortsZeebruggeandOstend-Belgium
WesternScheldt-Belgium
11
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.
12
PalmJebelAliIsland-Dubai(U.A.E.)Dredgingworks,landreclamationandrockrevetment-TrailingSuctionHopperDredgerAlexandervonHumboldt
13
lanD reclamation
PalmJebelAliIsland-Dubai(U.A.E.) PalmJebelAliIsland-Dubai(U.A.E.)
PalmJebelAliIsland-Dubai(U.A.E.)
14
PalmJebelAliIsland-Dubai(U.A.E.) Waterfront-Dubai(U.A.E.)
Waterfront-Dubai(U.A.E.)
15
lanD reclamation
PulauTekong-Singapore
16
ChekLapKok-HongKong
SaadiyatIsland-AbuDhabi(U.A.E.)
17
lanD reclamation
Cancn-Mexico
Cancn-MexicoCancn-Mexico
18
DeHaan-Belgium
Texel-TheNetherlands
Sylt-Germany Sylt-Germany
19
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.
20
NewContainerTerminal-Dubai(U.A.E.)Dredgingworks,landreclamationandrockrevetment
21
roCk revetment
PalmJebelAliIsland-Dubai(U.A.E.)
NewContainerTerminal-Dubai(U.A.E.)
PalmJebelAliIsland-Dubai(U.A.E.)
22
PulauTekong-Singapore
PulauTekong-SingaporeNewContainerTerminal-Dubai(U.A.E.)
NewContainerTerminal-Dubai(U.A.E.)
23
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.
24
ManifaFieldCausewayandIslandConstructionProject-Manifa(Saudi-Arabia)Designandconstructionof27reclaimedislands,connectingroadsandbridges
25
offshore services
Manifa-SaudiArabia Manifa-SaudiArabia
Manifa-SaudiArabia
Manifa-SaudiArabia
26
MontagneJacquot-Mauritius NORFRAPipeline-France
NORFRAPipeline-France
27
offshore services
Sakhalin-Russia Langeled-England
Langeled-England
Langeled-England
28
OffshorePipeline-Taiwan AdriaticLNG-Italy
GloryHoles-Canada
29
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.)
30
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
31
port infrastruCture Works
CallaoTerminal-Peru
PortofDuqm-Oman
Durban-SouthAfrica
32
LeonardodaVinci-CutterSuctionDredgerNewPortofCoega-SouthAfrica
RasLaffan-Qatar
Montevideo-Uruguay
33
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.
36
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.
39
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.
40
JanDeNulsdredgingfleetisthemostmodernandmostdiverseintheworld.The
Companypolicyfocusesoninvestinginnewvesselsandequipmentandontheuse
ofinnovativeandmoderntechnology.
Tobeabletomeetthegrowingdemand,JanDeNulGroupcontinuestoinvest
intheexpansionofitsfleet.TheGroupsownDesignandEngineeringdivision
designsnewvesselsinhouse,whicharethenbuiltinvariousshipyardsalloverthe
world.JanDeNulGroupalsodeliverstherequiredspecificdredgingequipment
totheshipyard,whichisauniquefeatureinthedredgingindustry.Thisdredging
equipmentisdesignedandengineeredwithintheCompanyandthenfabricated
andassembledintheCompanysworkshopsinAalst.Thankstoaninvestment
programmeof1.8billionEuro(coveringaperiodupto2011)thefleetnow
consistingof42vesselswhichwillbeexpandedwithanother20newvessels.
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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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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
[email protected] I www.jandenul.com