Services: Ground Anchoring, Soil Nailing, Slope Protection
Main Contractor: Lindesay Construction
Engineer: Tonkin & Taylor
A prime water front site in Auckland has a coastal perimeter that is formed by steep cliffs with mature Pohutukawa trees and other low vegetation growth. Significant periods of high rainfall resulted in a significant slip near the main dwelling.
During a site walkover it was also noticed that a crib wall which runs parallel to the beach, and, the access driveway to the dwelling was showing various signs of distress. The risks on the project were numerous and included the geographical location and relative isolation from the land, climatic conditions, variable ground and the environmental impact on the adjacent marine area. A significant amount of collaboration and co-ordination between all parties was required to mitigate the risks.
The only access to get plant and material to this ‘isolated’ section of beach in one of Auckland´s most exclusive suburbs was by barge. This required thorough planning and co-ordination around the tides. The work was predominantly carried out from the beach and this presented challenges for all parties in terms of plant and material security given the high tide came right in to the work face. The environmental controls were monitored throughout the day. Marine protection was maintained by a large floating boom and smaller environmental controls that were set up for specific tasks.
A team of experts was assembled and Grouting Services worked closely with the engineers, main contractor and other sub-contractors to develop a design that was buildable, cost-effective and efficient.
The emergency slip repairs and ground stabilisation works undertaken by Grouting Services included;