Canley Vale Overbridge - NSW Australia Canley Vale Overbridge - NSW Australia Canley Vale Overbridge - NSW Australia Canley Vale Overbridge - NSW Australia

Canley Vale Overbridge - NSW

Project featuring the Allanblock & Miragrid XT System.

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General Information

This project involved the re-construction of the T-intersection at Bareena St & Railway Parade and a roundabout on the western side of the railway lines at Canley Vale Rail Overbridge. Since the roundabout would occupy a larger footprint than the existing T-intersection, it was proposed that a reinforced soil wall be constructed in order to support an extension of the fill embankment west of the elevated intersection. The Allanblock & Miragrid XT retaining wall was adopted and the successful system for the application based upon cost effectiveness and aesthetic appearance.

Detailed global instability/foundation interaction of the reinforced soil wall was carried out by Douglas Partners and GHD LongMac consulting geotechnical engineers. The existing stormwater pipe required a pier/beam reinforced concrete slab protection system to be constructed prior to the reinforced soil wall construction.

Canley Vale Overbridge - NSW Australia

Extensive sub-surface drainage was incorporated into the design of the embankment involving: Stripdrain @ 5m cts for chimney drain at the rear of reinforced fill zone linked to transverse drains @ 10m cts @ the base of the structure taken through to the front face of wall and connected to external drainage systems outside the wall profile.

Retaining Solutions was responsible for the design, supply & construction of the retaining wall system. The scope of work included supply and installation of : levelling pad; Allan block facing units & capping units; installation of subsurface drainage systems; placement & compaction of imported select backfill and placement /tensioning of Miragrid XT geogrid soil reinforcement. Fall from height protection was achieved using a full height scaffold surrounding the entire wall profile.


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Project Specs

  • Application - Road Widening Embankment Stabilisation
  • Product - Allanblock & Miragrid XT System
  • Finish - Splitface Sandstone
  • Area - 345m2
  • Max. Height - 6.0m
  • Length - 65m
  • Loadings - 20kPa
  • Design life - 100 years
  • Owner - Fairfield City Council
  • Client - Fairfield City Council
  • Construction - 2 weeks

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