Civil Construction Projects

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  THE MOUNTAINEER – WATERTIGHT BASEMENT AND DEWATERING (2008/2009)

  Client: Rilean Construction Ltd Project Manager: Jaron McMillan Site Manager: Philip Cave Location: Queenstown, CBD Relevance: Piling was required create an interlocking watertight basement, liquefaction piles were installed from basement level, and dewatering of the basement at 200 litres per second during construction of the basement slab also. Scope of work: 271 x CFA (Continuous Flight Auger) Secant Piles 600mm diameter, installed to 12m depth. 89 x CFA 800mm diameter Liquefaction and tension piles, 5 x dewatering bores, pump installation settlement tanks etc. Ground conditions were very wet, high water table, sandy silts and gravels. The fully instrumented CFA method negates the requirement for temporary casing, and piles were installed very rapidly. Track record: Scheduled piling duration 12 weeks, the piles were completed in 12 weeks and on budget. Dewatering was completed in 2 weeks. Contact: John Trowsdale - Holmes Consulting (021 388 175) Graham Salt - Tonkin and Taylor regarding the dewatering (021 341 851)
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  Bridge 27 – Broken River Viaduct

  Client – Downer February to June 2011 Description: 8 piles 1200mm and 1050mm diameter to 15m depth, 4 driven H piles to 12m depth. Sheet piling for temporary working platforms. McMillan Drilling were approached by Downer to provide a submission for underpinning the broken river viaduct on New Zealands trans-alpine railway. The submission was based around very tight timeframes, and extremely limited access constraints. To get the piling rig to site required a 16 crawl around bluffs on farm tracks. 8 wheel trucks were the largest items of plant able to access the site. The works involved Drilling and Casing through unconsolidated materials to bed rock that was encountered between 10m and 15m depth. A 3m rock socket was then drilled into competent rock. McMillans provided innovative solutions to reduce vibration, and gain access to areas with equipment of a size capable of conducting the works. Access to the far side of the viaduct was by train only, all the piling equipment was loaded onto a work train and transported across the viaduct and works conducted with no access to support equipment. Concrete to pour the piles was pumped via hard line 165m across the viaduct. The job was completed successfully on time and within budget.

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