Lisarow Aged Care Facility - Central Coast, NSW Lisarow Aged Care Facility - Central Coast, NSW Lisarow Aged Care Facility - Central Coast, NSW Lisarow Aged Care Facility - Central Coast, NSW

Lisarow Aged Care Facility - Central Coast, NSW

Project featuring the Humecrib® system.

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General Information

Astoria projects are constructing a new Aged Care Facility at Lisarow, as part of a staged development in the area. The current stage consisted of demolition of the existing infrastructure, earthworks, foundation works, a new multi-storey building, new access road, landscaping and replacement of existing “timber/shotcreted-tyre” gravity retaining walls.

The project required the design and construction of a 5.875m high concrete cribwall to retain the existing deteriorating retaining structures. The design configuration of the Humecrib® walls utilised both single depth and double depth construction. Single header construction was used in front of the stable “shotcreted-tyre” gravity retaining walls, whilst double header construction was used to retain the embankment where the failing timber cribwalls were to be removed. The interpreted geotechnical model of the existing embankment consisted of weathered rock (extremely weathered siltstone – low to medium strength) overlain by “low to medium plasticity” very stiff clays. 

Lisarow Aged Care Facility - Central Coast, NSW
Lisarow Aged Care Facility - Central Coast, NSW

Construction of the 156m long Humecrib wall was carried out in stages to ensure stability of excavated embankments would not be compromised due to inclement weather conditions experienced throughout the project and also to ensure safety for all personnel. Each respective completed section of cribwall was then backfilled with 40 to 70mm basalt aggregate up to underside of soil plug, followed by soil batter installation works undertaken by Bolte Civil. The wall also incorporated a nicely constructed radii around existing trees and other obstructions, another advantage of using the Humecrib® system.

Retaining Solutions scope of works involved : design, supply & installation of Humecrib® system components including; reinforced concrete footings; non-woven geotextile over excavated embankment face; placement of cribwall infill 40 to 70mm basalt within crib silos and to rear of cribwall; in addition to surveyor conformance +/- 30mm.

The wall construction was completed on schedule subject to inclement weather delays, due to the close working relationship with the principal earthworks contractor Bolte Civil Pty Ltd.


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Project Specs

  • Application - Cut Embankment Stabilisation
  • Product - Humecrib® System
  • Finish - Plain Grey
  • Area - 600m2
  • Max. Height - 5.875m
  • Length - 156m
  • Loadings - 5kPa & 4:1 batter
  • Design life - 60 years
  • Owner - Astoria Group Pty Ltd
  • Client - Bolte Civil Pty Ltd
  • Construction - 4 weeks

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