Sydney Trains Electrical Network Upgrade Project …...Network Upgrades in Haberfield, Leichardt &...
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SYDNEY TRAINS ELECTRICAL NETWORK UPGRADE OIL/GAS | SEWER | STORMWATER | POWER | WATER | TELCO LOCATION Erskineville, Haberfield & Leichardt NSW CLIENT Sydney Trains PIPE 180mm HDPE orange electrical conduits GEOLOGY Rock, clay & fill ground conditions LENGTH 264 metres TECHNIQUE HDD PROJECT OVERVIEW UEA’s HDD division has recently completed the underbores required as part of the Sydney Train’s Electrical Network Upgrades in Haberfield, Leichardt & Erskineville. As part of the project, using Vermeer D6090 & Ditch Witch AT3020 HDD rigs, UEA completed three separate underbores at: o Barton Ave, Haberfield – 84 metres: 4 x DN180 HDPE electrical conduits with 50mm spacers o Darley Road, Leichardt – 130 metres: 4 x DN180 HDPE electrical conduits with 50mm spacers o Eveleigh Yard, Erskineville – 50 metres: 3 x DN180 HDPE electrical conduits with 50mm spacers SCOPE OF WORKS Haberfield & Leichardt Sydney Trains 11kV feeders 533A and 533B previously provided connection between Lewisham and Strathfield substations. These feeders cross Hawthorne Parade Canal in Haberfield over a footbridge, which was no longer safe for pedestrian use and has been replaced by an alternative bridge, approximately 130 metres north of the existing bridge. The objective was to relocate the 11kV feeders (533A and 533B) from the retired footbridge to the new Transport for NSW (TfNSW) footbridge, which was constructed with four spare conduits suitable for accommodating the feeders in anticipation of this project. UEA’s scope of works included the construction of two underbores required for this project (see above photo): an underbore at Barton Avenue, and an underbore at Darley Road under the Light Rail corridor. Erskineville (Eveleigh Yard) Sydney Trains constructed an 11kV cable route inside Eveleigh Yard for feeders 512 and 515. Part of this route involves an underline crossing (ULX) below seven tracks inside the maintenance yard. The maintenance yard is a thoroughfare for trains heading into and out of Sydney for routine maintenance, which includes both metro and country trains. As such, the seven tracks had live train traffic during the underbore that added another level of complexity to the underboring process. UEA implemented a
Transcript of Sydney Trains Electrical Network Upgrade Project …...Network Upgrades in Haberfield, Leichardt &...
SYDNEYTRAINSELECTRICALNETWORKUPGRADEOIL/GAS|SEWER|STORMWATER|POWER|WATER|TELCO
LOCATION Erskineville,Haberfield&LeichardtNSW
CLIENT SydneyTrains
PIPE 180mmHDPEorangeelectricalconduits
GEOLOGY Rock,clay&fillgroundconditions
LENGTH 264metres
TECHNIQUE HDD
PROJECTOVERVIEWUEA’sHDDdivisionhasrecentlycompletedtheunderboresrequiredaspartoftheSydneyTrain’sElectricalNetworkUpgrades inHaberfield,Leichardt&Erskineville.Aspartof theproject,usingVermeerD6090&DitchWitchAT3020HDDrigs,UEAcompletedthreeseparateunderboresat:
o BartonAve,Haberfield–84metres:4xDN180HDPEelectricalconduitswith50mmspacerso DarleyRoad,Leichardt–130metres:4xDN180HDPEelectricalconduitswith50mmspacerso EveleighYard,Erskineville–50metres:3xDN180HDPEelectricalconduitswith50mmspacers
SCOPEOFWORKSHaberfield&LeichardtSydney Trains 11kV feeders 533A and 533B previously provided connection between Lewisham andStrathfieldsubstations.ThesefeederscrossHawthorneParadeCanalinHaberfieldoverafootbridge,whichwasnolongersafeforpedestrianuseandhasbeenreplacedbyanalternativebridge,approximately130metresnorthoftheexistingbridge.Theobjectivewastorelocatethe11kVfeeders(533Aand533B)fromtheretiredfootbridgetothenewTransportforNSW(TfNSW)footbridge,whichwasconstructedwithfourspareconduitssuitableforaccommodatingthefeedersinanticipationofthisproject.UEA’sscopeofworksincludedtheconstructionoftwounderboresrequiredforthisproject(seeabovephoto):anunderboreatBartonAvenue,andanunderboreatDarleyRoadundertheLightRailcorridor.Erskineville(EveleighYard)SydneyTrainsconstructedan11kVcablerouteinsideEveleighYardforfeeders512and515.Partofthisrouteinvolvesanunderlinecrossing(ULX)belowseventracksinsidethemaintenanceyard.ThemaintenanceyardisathoroughfarefortrainsheadingintoandoutofSydneyforroutinemaintenance,whichincludesbothmetroandcountrytrains.Assuch,theseventrackshadlivetraintrafficduringtheunderborethataddedanotherlevelofcomplexitytotheunderboringprocess.UEAimplementeda
methodologyforundertakingtheprojectthatrequiredacombinationofmixedworkinghoursandavarietyoftechniquesthatmadetheinstallationofconduitssimpleamongthelimitationsofthesite.TECHNICALDETAILSUEA’steamwastaskedwiththeconstructionoftheunderborerequiredforthisproject.Workingwiththebriefprovidedby theclient,UEAundertookanadditional topographical surveyof theproposed route todevelop a comprehensive underbore design for each section. This enabled the design in both plan andlongitudinal cross-sectional views inMGA coordinates. Jemenawas consulted due to the vicinity of theSecondaryGasMain(SGM)inHaberfield,andwhileworkingwiththeJemenaGasProtectionofficers,theSGMwaspositively identifiedusingNon-DestructiveDigging techniques.Once located,asteelprotectionplate was installed in front of the SGM, in line with Jemena’s guidelines and UEA’s underboringmethodology. Upon approval of the underbore designs, UEA completed surveying tomark and peg outeachoftheunderborealignments.A Track SedimentMonitoringProgramwas required for twoof threeof the completedunderbores. Theunderboredesignsprovidedthedatarequiredtodevelopandimplementtheprogram,inwhichanumberofmonitoringtargetsareplacedinkeypositionsonandaroundthetrackalongtheunderboreroutespriortothecommencementofwork.Thisallowsaremotemonitoringstationtobesetupnearby, inordertoestablishabaselineofdatashowingthepreconstructionlevelsofthetracksandsurroundingsurfaces.Theremote monitoring station was utilised to constantly record readings before, during and after theunderboringworks.As part of the Track SedimentMonitoringProgram,UEAengaged a trackprotectionofficertoallowtheteam’sHDDoperativestotracktheunderboreacrossliverailtrackssafely.Workswerecompletedpredominatelyoutsideofatrackpossession,sotrainswerestillactiveacrossthenetwork.EachsitehadlimitedaccessaswellasalimitedareatosetuptheHDDrigandassociatedequipment.Asaresult,theweldingandstringingoftheHDPEelectricalconduitshadtotakeplaceadjacenttothesiteitself.On completionof the conduitwelding,UEAused custom-made spacers to formabundle ready for pipepull.Duetothecombinationofsoftclayandrockgroundconditionsforthefirsttwounderbores,UEAhadtheflexibility to use a second HDD rig and a variety of associated tooling. While working on the thirdunderbore, fill groundconditionswasencountered,whichcomplicated the removalofmaterial from theboreholeduringthereamingprocess.Thisincludesmaterialsuchasballastandunusedtracksleepers.COMPLETIONUEA used the team’s own pipe rollers and highly skilled HDD operatives to minimise the risk of pipedamageduringpipepull.Takingintoconsiderationthetightprojectschedule,UEAmanagedtosuccessfullycomplete all three underbores while working through constant wet weather and changing groundconditions.
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