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CASE STUDYSH20A TO AIRPORTMANUKAU, AUCKLANDSECUGRID - MULTI
DIRECTIONAL GEOGRID
®
PROJECTSH20A is the primary route to and from Auckland Airport
and forms a strategic link between SH20 & SH16, the Airport
Business District and the greater Auckland area. The NZ Transport
Agency’s upgrade of SH20A to motorway standard has provided a
safer, more reliable route to and from the airport and has
increased freight efficiency around South Auckland. DESIGNCirtex
worked with FCC temporary works engineers to design working
platforms over very weak ground conditions for the safe operation
of heavy machinery. Cirtex also provided an alternative slope
stability solution, saving significant time and money.
INSTALLATIONTwo layers of SecuGrid were used to reinforce the
gravel raft providing efficient load distribution of the stresses
transferred from the heavy plant and equipment. As an alternative
to sheet piling Platipus Anchors were used in conjunction with
CombiGrid to stabilise steep cuts.
The products used provided the following benefits to the
project:• Platipus provided an anchor system that was cost
effective in comparison
to other systems• CombiGrid and Platipus anchors were chosen to
stabilise steep cuts as
they used readily available equipment for installation• SecuGrid
assisted in providing an efficient and safe working platform
CONTRACTOR MHX Kirkbride Alliance
SUB-CONTRACTOR Fletcher Infrastructure & Higgins
ENGINEER Beca and Fletcher Construction Co (FCC)
CLIENT NZTA
LOCATION Manukau, Auckland
PRODUCTS USED SecuGrid® geogrid, Platipus® earth anchors,
Rockfall Mesh, CombiGrid® geotextile/geogrid composite, DuraForce™
geotextile and erosion & sediment control products
temporary works engineers
