“The Gate”, a prestigious 12 building commercial
development was constructed on a closed industrial
waste landfill. The landfill had not been identified
before construction started so Tonkin & Taylor
retrofitted foundation and landfill gas protection
solutions to a building under construction.
Subsequent buildings used an innovative mix of
dynamic compaction ground improvement and low
cost landfill gas protection measures integrated
into building foundations. Cutting edge membrane
products were used subsequently to allow foundation
reconstruction for specialist tenant requirements.
Few large sites suitable for retirement village
development are available near the centre of a city.
Ryman Healthcare used Tonkin & Taylor’s skills to
redevelop a former landfill site beside Remuera golf
course. The project required extensive geotechnical
preparation, including dynamic compaction and piling
to allow construction of buildings, ornamental and
swimming pools and extensive landscaping. An active
landfill gas extraction system and multi-level building
protection systems provide a high level of assurance
for residents and owner.
The largest warehouse building in the southern
hemisphere is being constructed in stages on the
closed Pikes Point municipal landfill on the edge
of the Manukau Harbour. Construction on this site
is being achieved by a combination of dynamic
compaction ground treatment and landfill gas
protection measures incorporated in the building’s
foundations. Service trenches into refuse are
minimised by innovative design. Careful earthworks
design and management is required to avoid
impacts on the harbour environment and on
construction workers.
