| 59 CONTRACTING CLL Solutions Ltd Te Kaha project an honour CLL Solutions specialises in best-practise piling, retaining, ground stabilisation and ground improvement. T T Kelly Deeks For a Complete Hose and Hydraulic Service Proud to be associated with CLL Solutions Ltd MOBILE BREAKDOWN SERVICE For a Complete Hose and Hydraulic Service 484 Johns Rd, Harewood, Christchurch 8548 Pneumatics Industrial Marine Agricultural Material Handling Hose & Tube Fittings 0800HOSEMAN (0800 467 362) | enquiries@hoseman.co.nz • Pneumatics • Industrial • Marine • Agriculture • Material Handling • Hose & Tube Fittings 0800HOSEMAN (0800 467 362) enquiries@hoseman.co.nz 484 Johns Rd, Harewood, Christchurch 8584 Offering unique techniques and technologies, CLL Solutions brings best available practice in piling, retaining, ground stabilisation, and ground improvement to iconic construction projects in New Zealand’s complex geological conditions. With a key focus on commercial, industrial, civil, and residential foundations, CLL runs a wide range of plant and machinery technologies to support specialised projects across New Zealand. CLL first came to Christchurch in 2012 with its Rammed Aggregate Piers, (RAPs), an intermediate foundation system which provides superior support capacity, increased bearing capacity, and superior settlement control. The technology is used to support buildings, high rises, silos, wind farm towers, bridges, and rail/road embankments around the world, and has a track record spanning the past 30 years. “RAPs are an excellent option when the sheer strength of the soil is insufficient to support a building, but is still greater than 35kPA,” says CLL founder and director Terry Donnelly. “The combination of densification, stiffness, and friction mitigates the risk of liquefaction in sandy and silty soils, and eliminates damage in line with prescribed design criteria. The increased friction angle generated by RAPs installed in embankments creates stability long term and for the seismic case.” CLL is licensed to use the patented RAP technology of USA company Geopier, and has used Geopier ground improvement techniques to mitigate the liquefaction risk in approximately 200 sites. Meanwhile Continuous Flight Augering (CFA) is a technique to create concrete deep foundations. The CFA technique is significantly quicker than other piling methods, and has the advantage of no raising, cleaning, or lowering of tooling into the hole as it is being drilled, which anyone who has experienced it knows, generates a very high level of disruptive noise. “In a 500 pile project for example, CFA might allow us to put in 20 a day. Other standard methodologies, using casing for example, you’ll be lucky to do four a day. CFA can significantly lower the price of piling.” “As you take the soil and spoil out, you’re filling the hole with concrete from the bottom up,” Terry says. “It means the hole never depressurises and is never unsupported, it is always engaged and you have no problem with groundwater. “It is also a technique that lends itself to repetition. In a 500 pile project for example, CFA might allow us to put in 20 a day. “Other standard methodologies, using casing for example, you’ll be lucky to do four a day. CFA can significantly lower the price of piling.” CLL is currently using RAPs for ground improvement and CFA foundations on Williams Corporation’s Manchester Square development, a mixture of commercial and terraced and apartment living in the centre of Christchurch CBD. This is CLL’s second project for Williams Corporation, having also worked on its Banks Ave residential development in 2021, while in town as the geotechnical designer for Te Kaha Stadium. RAPs and Geopier were used on their projects, with three fixed mast rigs deployed for ground improvement. CLL compacted 20,400m3 of aggregate into the ground up to depths of 12m, with the density and load capacity beneath the proposed structure successfully increased thanks to the use of innovative design, cutting-edge equipment, and technology. CLL was honoured to have been awarded the Te Kaha project, fulfilling its contractual obligations with professionalism and diligence. CLL remains at the forefront of the industry by connecting with local and offshore supplier networks, such as Sireg in Italy and Geopier in Canada.
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