South Coogee Estate, South Coogee NSW
Project featuring the Austral Heron Block System.
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General Information
The site, originally known as Endeavour house, was a department of defence housing facility for the Royal Australian Navy. The Mirvac Group acquired the site, demolishing the existing structures to make way for a new residential sub-development. Ward Civil were engaged by Mirvac to complete all civil earthworks for the project and as part of these works, Retaining Solutions was subcontracted to supply and construct 660m² of terraced segmental block no-fines gravity retaining walls along the Eastern boundary of the site. Forrest Engineering Solutions were engaged by Mirvac to complete the design of the retaining walls in accordance with AS4678 “Earth Retaining Structures”.
Design and construction of the retaining walls was made difficult due to an existing derelict concrete crib wall, which was quickly deteriorating causing concern for the adjacent properties. Much of the crib structure was demolished, however as it was still active in retaining a number of backyards, the new block wall needed to be integrated in some sections. This called for a unique design in which the no-fines zone at the rear of the retaining wall interlocked with the existing cribwall.
Retaining Solutions scope included: the supply and installation of the unreinforced concrete levelling pad, Herron “Pebble” blocks & caps, 20mm drainage aggregate, 100mm diameter socked and slotted drainage aggregate pipe, non-woven geotextile filter fabric and installation of no–fines concrete.
Project Specs
- Application - Cut Embankment Stabilisation
- Product - Austral Heron Block
- Finish - Flushface - Pebble
- Area - 660m2
- Max. Height - 2.5m
- Length - 230m
- Loadings - 2.5kPa
- Design life - 100 years
- Owner - Mirvac
- Client - Ward Civil Contracting Pty Ltd
- Construction - 3 weeks
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