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Services: Asbestos & Environmental Remediation

Richmond Terminal Station

The Richmond Terminal Station rebuild has been one of the most critical power project ever undertaken in Australia

Key to AusNet Services’ landmark Edison Project, Multiworks contributed to the upgrade and replacement of aging electrical infrastructure and equipment at Richmond, Brunswick and West Melbourne terminal stations. The upgraded terminal stations deliver new technologies to support inner Melbourne’s increasing population growth and power supply needs.

The Richmond Terminal Station was the first and largest of the Project Edison terminal station sites. It involved execution of sequential and continuous civil and building works in 14 stages over a seven-year period. Throughout delivery Multiworks ensured electricity to the network including to Melbourne’s CBD remained uninterrupted.

Multiworks was engaged directly by Ausnet Services in 2012 under a lump sum contract valued at $8.3M and subsequently completed works to the value of $100M onsite, including:

  • New 66kV GIS Switch and Control Rooms (2 stage)
  • New 220kV GIS Switch and Control Room > Transformer Bays (Approx 6)
  • New Feeder Connections between existing and new switchyards, control buildings, internal roadways and switchroom
  • Monopole footings
  • Demolition of 220 & 66kV switchyards

 

Australian Institute of Building Logo The CCF Earth Awards Logo

Greenacre Substation NSW

Multiworks was engaged directly by Ausgrid as the Principal Contractor for the new Greenacre Substation. This includes interconnecting works associated with the adjoining and existing substation. Project scope included:

  • Remediation of over 30,000 tonnes of asbestos containing soil
  • New 132 & 11kv Building including cable basement, control and switchroom
  • Three Transformer Bays
  • Over 300m over conduit runs including through existing and live electrical substations
  • 132 & 11kv Switchyard
  • HV Cable Pulling and support structures.

West Melbourne Terminal Station

Part of AusNet Services’ landmark Edison Project, Multiworks contributed to the upgrade and replacement of aging electrical infrastructure and equipment at Richmond, Brunswick and West Melbourne terminal stations. The upgraded terminal stations deliver new technologies to support inner Melbourne’s increasing population growth and power needs.

Multiworks is engaged at the West Melbourne Terminal Station to deliver all civil and building work. The project scope involves:

  • New Control Building including all LV connections (i.e security, fire etc)
  • 220 & 66kV Switchyard
  • Asphalt and Transformer Roadways
  • Landscaping and External Works Sheeting Piling Retention Systems.

Narrabeen Control Building Roof Replacement

The Narrabeen Substation Control building houses the live electrical switchgear and equipment that control the adjacent substation. As part of the upgrade of ageing assets, Multiworks was engaged directly by Ausgrid as Principal Contractor to replace the existing roof while maintaining the live operations of the substation and the electrical network. The works included: replacement of roof tiles with Colorbond sheets, installation of CFC sheets, replacement of gutters, installation of new downpipes, installation of earthing spires and installation of new anchor points.

Prior to commencement of the roof replacement works the Narrabeen Control Building was impacted by a storm causing leakage inside the Switch-rooms. Ausgrid engaged Multiworks to execute emergency works to stop the leakage. This required the roof replacement works to be brought forward and delivered within a significantly constrained time frame.

Multiworks effectively mobilised a skilled team including additional resources from interstate. Due to the poor condition of the existing roof, Multiworks made the entire control room building watertight through implementing anchor points and tarping. This provided a temporary shield around the whole building, eliminated any impacts due to poor weather and ensured the ongoing operation of the control room.

Multiworks delivered the project one month ahead of schedule, while also completing the Castle Cove Substation works.

Castle Cove Control Building Roof Replacement

Multiworks was responsible for the replacement of roof metal sheets with Colorbond sheets, replacement of gutters, installation of new downpipes, construction of stormwater inlets and installation of new anchor points. Multiworks delivered all scope while ensuring the ongoing operations of the live electrical substation.

A key challenge in the roof replacement works involved implementing appropriate physical protection over the existing Frequency Injection Units (FIUs). Due to the sensitivity of the assets and client requirement that only one FIU could be de-energised at a time, Multiworks developed and implemented a staged works program over the FIUs. Multiworks effectively planned and scheduled materials and resources to ensure protection over the unit while replacing the section of roof directly above. The protection was then stripped so that the FIUs could be re-energised.

Additionally, Multiworks developed an innovative ‘Rolling Scaffold’ within the substation that offered fall protection and acted as a physical barrier to ensure the substation equipment was not exposed to falling objects.

Chullora Control Building Roof Replacement

The Chullora Substation Control building houses the live electrical switchgear and equipment that controls the adjacent substation. As part of the upgrade of ageing assets, Multiworks was engaged as Principal Contractor directly by Ausgrid to replace the existing roof without any interruptions to the electricity network.

Works took place on the existing live control building, housing equipment for this 66kV Substation. Key scope involved ACM eave replacement, removal of roof tiles, installation of two layers of Compressed Fibre Cement sheets, installation of Colorbond sheets, reinstating existing gutters, installation of new downpipes and installation of new anchor points.

During the preliminary planning, it was noted that the height from the pitch of the roof to the soffit was greater than 0.8m. Due to the substantial height difference the existing anchor points could not be used as a means of fall arrest. As a result, Multiworks proposed and successfully implemented a construction methodology that provided a means of fall arrest utilising anchor wraps. The project achieved zero safety incidents.

Lilydale Substation REFCL

The Victorian Government has mandated the rollout of Rapid Earth Fault Current Limiter (REFCL) installations across nominated Zone Substations in AusNet Services’ network, including at the Lilydale Zone Substation. Installation works included:

  • Two new REFCL(s) units in bunds and footings
  • Two new 22kV switched neutral bus kiosks onto new footings
  • A new REFCL Room on to new pad footings to house associated inverters and control equipment
  • A new modular Control Room onto new striped footings
  • A new cable trench (600mm Wide x 600mm Deep) running north west to south east for associated control cables Conduits for control cables
  • Associated reinstatement and surfacing

Replacement works involved:

  • The existing NER with one new NER onto new pad footing
  • Existing station service transformers (SSTx) with two new 750 kVA kiosk type units onto new pad footings and AC changeover boards
  • Both existing Capacitor Banks with Metal enclosed Cap Banks with pad footings for REFCL compliance.

Pit Repair – Exhibition Street

As part of an ongoing maintenance program Citipower/Powercor is upgrading and structurally reinforcing many of its underground cable pits within Melbourne’s CBD.

Multiworks was engaged by Citipower/ Powercor to rectify the Exhibition Street pit following cracking and subsidence to its lid.

Upgrade works were complex due to the pit’s location within high density areas, their confined size and pre-existing structural issues.

The works were staged during shutdowns and involved crews operating 24 hours per day to access, reinforce and reinstall pit lids over a weekend period.

Multiworks’ effective collaboration with key stakeholders and Citipower/Powercor ensured the works were completed over the planned weekend shutdown period.

ARMCO Pipe Bridge Relining

Multworks worked with V/Line as principal contractor to carry out ARMCO pipe upgrade works as part of their essential maintenance program across the network. The work involved the relining of the bottom half of ARMCO culverts with concrete to assist in maintenance and reduce corrosion.

The works were carried out in close consultation with V/Line and local council to ensure nil safety or environmental incidents occurred.