Fulton Hogan Ltd. - Smithbridge Joint Venture
Situation: The steep K6 cut had potential for landslip, and was in an earthquake zone, and an engineering design for slope retention was required.
Solution: Instant Screw Piling was contracted for design services only. The screw pile anchors had to hold the face of the excavation beyond the slip circle.
A technique was devised using four 6-metre benches, excavating from the top down and anchoring, before proceeding with the next bench...
Greg Clarke Building
Situation: Provide a cost-effective alternative foundation design for a three level apartment complex.
Solution: A conforming tender for a contiguous pile perimeter wall was priced at $900,000. Instant Screw Piling believed that this solution was in excess of the requirements for a building of the size intended for the site.
A solution comprising a combination of screw piles and a sheet pile perimeter wall sprayed with shotcrete provided a more economical solution that met all engineering requirements. This was costed at $543,000...
Joint Venture: Shell Petrochemicals and CNOCC
Situation: Design, and supervise the installation of foundations to overcome uplift in a large concrete discharge basin.
Solution: The $US4.5B Shell Nanhai petrochemicals project will be the largest plant of its kind in the world. The high water table under the massive 110m x 10m, 6-metre deep discharge basin applies considerable hydrostatic uplift on the base of the basin.
Instant Screw Piling was called upon to devise a foundation that coped with pile tension loans of 350kN and compression loads of 400kN. The solution was one-piece screw piles, between 12 and 15 metres deep, with twin 700mm diameter helixes at the base. This was the first application of screw piles in China...
Situation: Soil nails had failed in a retaining wall, after heavy rain, causing rotation in the retaining wall.
Solution: To stabilise the retaining wall tonnes of rail ballast were placed against the base of the embankment, to prevent further movement, and half of the road above it was blocking off.
Instant Screw Piling devised a procedure for cutting holes in the existing shotcrete wall, installing screw piles, tensioning them, and trying them in to the (repaired) shotcrete wall...