CASE STUDY SH20A TO AIRPORT MANUKAU, AUCKLAND SECUGRID - MULTI DIRECTIONAL GEOGRID
CONTRACTOR
MHX Kirkbride Alliance
SUB-CONTRACTOR
Fletcher Infrastructure & Higgins
ENGINEER
Beca and Fletcher Construction Co (FCC) temporary works engineers
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
PROJECT SH20A 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. DESIGN Cirtex 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. INSTALLATION Two 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
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