The intersection at Beckett Road and Hamilton Road is currently operating at capacity with significant delays experienced during peak hours. Brisbane Council upgraded the intersection by widening Hamilton Road and providing additional lanes to some sections of Beckett Road. This project involved designing a ≅100m long retaining wall on the South-East corner of the intersection on Hamilton Rd to accommodate the road widening.
Geoinventions Consulting Services (GCS) were engaged by HDR Engineering to provide the geotechnical design of a bored pile retaining wall system. The maximum retained height is approximately 2.8m and the design life of the retaining wall will be 120 years in accordance with the standard AS4678-2002 Earth-Retaining structure. As the neighbouring properties along Hamilton Rd are in close proximity to the proposed construction site, the space for constructing conventional retaining walls was insufficient. The bored pile retaining wall design required a minimal construction footprint to retain the existing soil, reduced the amount of excavation and negated the need for imported fill.
Geoinventions were additionally contracted by Doval Constructions Pty Ltd to design the working platforms for the piling rig and conduct the geotechnical assessment of the bored piles.
The services Geoinventions provided included:
- Temporary vertical cut assessment during the construction
- Design of bored pile retaining wall with shotcrete infill
- Design of temporary working platforms
- Construction staging drawings
- On-site geotechnical piling assessor
Construction commenced in mid February 2018 and was completed July 2018 ahead of schedule.