Alpha Road Playing Fields Upgrade - Willoughby NSW Alpha Road Playing Fields Upgrade - Willoughby NSW Alpha Road Playing Fields Upgrade - Willoughby NSW Alpha Road Playing Fields Upgrade - Willoughby NSW

Alpha Road Playing Fields Upgrade - Willoughby NSW

Project featuring the Keystone & Miragrid XT Geogrid System.

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General Information

Upgrading of the Shore School playing fields to cater for a new rugby & cricket field required a fill embankment 5.2m high to the northern end of the school grounds. All works carried out on the Shore School & RTA owned property had to be done in accordance with Cardno (NSW) Pty ltd technical specifications & Willoughby Council standards. The retaining wall chosen & specified was the Keystone Compac & Miragrid XTc segmental retaining wall system.

Ford Civil Contracting engaged the services of Retaining Solutions to design, supply & construct the specified retaining wall system to AS4678 “Earth Retaining Structures”.

The retaining wall was supported by a variety of reinforced concrete strip footings with piers to protect existing trees along the proposed alignment of the retaining wall.

Alpha Road Playing Fields Upgrade - Willoughby NSW

A unique detail that required close attention both in design construction was the interaction of a 6m high chainwire fence with 2m deep piers offset 300mm to the rear of the keystone facing column. The specified fence piers were 250mm in dia, spaced 900mm perpendicular to the wall and 2000mm longitudinally. The backfill used within the reinforced fill zone was imported crushed sandstone. The design also incorporated a full height gravel chimney drain to the rear of the reinforced fill zone.


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Project Specs

  • Application - Fill Embankment Stabilisation
  • Product - Keystone & Miragrid XT Geogrid System
  • Finish - Flushface with Split Face - Charcoal & Almond
  • Area - 545m2
  • Max. Height - 5.2m
  • Length - 140m
  • Loadings - 10kPa
  • Design life - 100 years
  • Owner - NSW & Shore Grammer School (SCEGS)
  • Client - Ford Civil Contracting Pty Ltd
  • Construction - 6 weeks

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