Multiworks completed the ‘enabling works package’ for the widening of runway 16/34 at Melbourne Airport. Engaged by the principal contractor, John Holland Constructions and ATS McMahon, the project preceded a $20M contract to widen the runway for the arrival of the Airbus A380. Works included;
- The extension and abandonment of approximately 30 duct banks containing 159 individual asbestos conduits.
- Internal sleeving of asbestos conduits with approximately 2000m of PVC conduit.
- Excavation of existing cables with non-destructive high pressure water jetting and vacuum extraction.
Work shifts commences at approximately 1 am with all personnel and equipment required to be clear of the runway by 5am. To avoid loose debris being sucked into aircraft engines all exposed soil was either plated or sprayed with bitumen emulsion at the conclusion of each shift.
Multiworks was engaged by Ausnet Services for the design and construction of an architectural fence and landscaping works to screen the South Morang Zone Substation.
Multiworks’ effective stakeholder engagement process involved close consultation with Ausnet and the City of Whittlesea Council to develop an aesthetically pleasing fence solution that incorporated the colours of each of the organisation’s logos.
The resulting architectural fence design comprised a combination of slender steel frames and precast concrete panels to support a colourful plastic façade.
The foundation layout design required careful consideration to ensure safe approach distances were maintained for the surrounding 22kV feeder cables.
The foundations for the architectural elements included 28 pad footings and over 155 lineal metres of strip footings for the steel frames and precast concrete panels.
The decorative cladding material covering the steel frames and precast panels comprised 20mm thick sheets of recycled high-density polyethylene. These were fixed to the structure at over 4,000 locations, each with a custom-made HDPE cap that covers the fixing.
The landscaping works prioritised Australian native species including removal of aggressive foreign species and protecting three magnificent heritage listed River Red Gums and the habitat they provide.
With over 3,500 new plantings, carefully placed rock work and a sensational architectural fence, Multiworks met client and community objectives while successfully completing the project on time. All while maintaining an impeccable safety record.
British Solar Renewable (BSR) initiated the Concrete Package at the Kerang Solar Farm which is Australia’s largest integrated battery and solar farm, home to a 50-megawatt battery that stores 100% renewable energy and feeds directly into the state’s electricity grid. Multiworks, working under British Solar Renewables, were responsible for the civil works associated with this project including footings, landings and piers.
SCOPE
Multiworks provided civil construction and project management services to deliver the Kerang Concrete Package. The scope involved:
- 19 reinforced concrete stair landings
- 13 deep reinforced concrete piers
- A reinforced concrete transformer base
- A reinforced concrete generator slab
CHALLENGES
- The project posed multifaceted challenges, spanning survey, groundwater management, reinforced cages design, including access, drainage, and earthwork benches.
- The project also faced intense timeline constraints as project award to project completion was an extremely quick turnover.
- Work was required to be completed in time for the arrival of the Switchroom.
ACHIEVEMENTS
- Despite the need for a quick turnover and immediate mobilisation to regional Victoria, the project was completed on schedule, demonstrating our ability to manage and execute projects efficiently.
- We maintained a flawless safety record with zero incidents throughout the project duration.
- The quality of our work was praised with no defects reported, reflecting Multiworks dedication to high standards.
- Due to the Clients satisfaction with our work, the Scope was extended for additional concrete works.
The Beryl and Mount Piper Substations contain 132/66kV networks to supply the local townships. Due to the aging condition of the existing transformer bunds a new containment system was required to allow for the containment of water and oils should there ever be a fault with the transformer. Multiworks provided all upgrade works at the two substations to upgrade this existing oil containment system. This involved the construction of new primary spill oil tanks, upgrade of existing bunds, installation of new connecting pipework for both substations and flame traps for Mount Piper only.
Adding to the complexity of this scope was the proximity of the proposed containment systems to the adjacent high-voltage and in-service electrical equipment. Multiworks took over the design of this element to create a piling retention system adjacent to the structures and to ensure the site remained operational through the work.
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.
The Heywood Terminal Station (HYTS) 500 kV CB Replacement project includes establishment of two new 500 kV switch-bays to convert the incoming MOPS and TRTS line bays to a double-switched arrangement.
Multiworks was engaged by Zinfra to carry out all civil work associated with the project scope, including:
- Replacement of existing MOPS/TRTS line bay ROIs, CVTs and Surge Arresters
- Replacement of M1 and M2 transformer 500 kV Surge Arresters
- Decommissioning of 22 kV No.3 station services transformer
- Replacement of the 415 V station services infrastructure
- Installation of new 500kV Bus protection, new X & Y CBM scheme
Among other elements, Multiworks was engaged by Zinfra to construct a new 50,000L containment tank within the existing electrical substation.
Due to its size and weight, the containment tank was required to be constructed in-situ. Multiworks utilised prefabricated formwork boxes to set-out the tank and pour its 3 compartments in a singular pour.
Multiworks were engaged by Citipower/ Powercor to excavate and construct a new in-ground electrical cabling pit at Richmond Terrace. Work included;
- Excavate around pit and expose existing 66kV feeder cables – 3 x cable joints
- Demolish existing pit and install new precast cable pit
- Backfill excavation and reinstate road
The Tottenham Substation contained a legacy triple interceptor pit and transformer bund drainage system onsite that was abandoned and not in operation. This project involved the re-use part of this existing abandoned system where possible in constructing the new system. The existing triple interceptor pit was removed and a Humeceptor pit (HCP) and associated pipework was installed in its place.
Other work onsite included new pits and DICL pipework through the existing substation and the re-lining of transformer bases with fibre cement.
Multiworks’ works onsite involved all civil works related to the contract for the new MTM Cheltenham Substation. Included within these works were building bored piers (600Ø 3.6m deep), Overhead 1500 Switch Feeder bored piers (900Ø 10m deep), Overhead 22Kv (900Ø 10m deep), Undertrack bore x3, conduit trench installation, Building concrete slab, Transformer bay Concrete slab and Brickwork, Security fencing and gates.
All works were completed ahead of program whilst working under the site conditions and restrictions imposed from the interaction with the public and under live rail conditions. PTV commended Multiworks on the management of the Cheltenham station car park (public & vehicle interaction) whilst the retaining wall and the changes to the carpark were completed.
