The project involved the design and build of 3 retaining walls to remediate slips, and increase the road width, Hiway Geotechnical’s design involved installation of micro piles, construction of a reinforced concrete footing. Once the footing was completed, soil nails and rock fall netting were placed in the embankment.
A GSC wall was then constructed, this was finished with a masonry block facing. Construction works were undertaken under Level 1 Stop / Go traffic control, as the road was too narrow to enable a single lane of traffic with construction machinery.
After a series of sub-tropical cyclones pounded the upper North Island in early 2017, the road infrastructure owned by Auckland Transport and managed by Broadspectrum suffered extensive damage.