Inchcape Motors Australia, Prospect NSW Inchcape Motors Australia, Prospect NSW Inchcape Motors Australia, Prospect NSW

Inchcape Motors Australia, Prospect NSW

Project featuring a KeySteel® & Keystone Geogrid System.

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General Information

Australand is one of Australia’s largest industrial property owners with a modern portfolio of prime assets occupied by quality tenants. This warehouse/office development along Butu Wargun Drive at Prospect was for Inchcape Motors Australia. Both Burton Contractors and CB Constructions were engaged to carry out bulk earthworks operations. As part of these works Retaining Solutions was subcontracted to design & construct three walls (RW1, RW4 & RW5). Innovative designs were carried out using both extensible and inextensible reinforcements due to associated wall heights and loading conditions for both boundary walls and entry/exit ramps to the development. Costin Roe Consulting was the principal structural consultant.

The main boundary wall RW1 (330Lin.m long) involved the design & construction of a 6.6 m high masonry concrete block reinforced soil wall using KeySteel®, Keystone Compac II, KeyStrip steel ladder & Miragrid polyester geogrid soil reinforcements. The wall was required to support a uniform vertical live load surcharge equivalent to 25kPa offset less than 2.5m from the rear of the facing units. A key feature of this project was that an external scaffold to the wall face could not be used for fall protection due to tight boundary constraints, the alternative utilized an innovative jersey kerb/static line arrangement to prevent workers falling from height during both block placement and hand compaction operations. The retaining walls were also required to support a 2.1m high chainwire fence located directly behind the facing column. The top three courses of Keystone Compac II units were filled with no-fines concrete encasing sleeves which were installed prior to fence post installation.

Inchcape Motors Australia, Prospect NSW


The design and construction of entry/exit ramps to the development (RW4 & RW5) required a back to back reinforced soil structure with an integrated crash barrier/slab arrangement spanning between the two walls. The top course of Keystone Compac blocks were cut to grade to cater for ramp profile.

Retaining Solutions scope of works involved the design of the reinforced soil walls to Australian Standard AS4678 – “Earth Retaining Structures” ; supply & installation of: Keystone Compac II blocks, fibreglass alignment pins, galvanised KeyStrip steel ladders and steel connecting pins, Miragrid polyester geogrid, 20mm drainage aggregate, 100mm dia socked and slotted drainage aggregate pipe and placement, spreading & compaction of the imported select backfill (“Greystanes – sandy/gravel blend) used within the reinforced fill zone. The works were carried out to a very tight construction programme on time, within budget and most importantly satisfying Australand Holdings strict OHS guidelines. Retaining Solutions produces with every wall complete, full quality documentation e.g Inspection & Test Plans, Daily Quality Verification Checklists in addition to detailed daily site diaries detailing operations and overall checks carried out over the duration of the wall construction from levelling pad placement to capping unit installation. This level of documentation proving to be both beneficial to both developer/owner and Retaining Solutions.

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Project Specs

  • Application - Fill Embankment Stabilisation
  • Product - KeySteel®, Keystone & Geogrid System
  • Finish - Compac II Split Face 'Flushface & Bevelled'
  • Area - 2040m2
  • Max. Height - 6.6m
  • Length - 450m
  • Loadings - 25kPa offset 3m
  • Design life - 100 years
  • Owner - Australand Holdings Pty Ltd
  • Client - Australand Holdings Pty Ltd
  • Construction - 6 weeks

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