Housing in Southern Africa May 2015

Cement & Concrete

Student apartments

G auteng Piling had to install 175 auger cast-in-situ piles of varied diameters for the foundation of a newapartment block in Hatfield, Pretoria, which has been earmarked for students at the Univer- sity of Pretoria. Studios @ Burnett, a multi-storey apartment block, is being developed by the Feenstra Group and Costa Zervas Projects. The 4 300m² project on the corner of Burnett and Grosve- nor streets, Hatfield, is close to the university. The auger piles provided by Gauteng Piling are formed by drilling holes into the ground, placing steel reinforcement and then filling with concrete. In built-up residential areas such as Hatfield, the drilling for auger cast piles causeminimal disturbance. Kobus Geyer, Site Manager for Gauteng Piling, says that the 175 auger piles required for the foundations varied in diameter. “For example, we provided 1 x 300 mm pile, 27 x 550 mm, 31 of 800 mm, 15 x 1,4 m and 9 x 1,5 m - 15 different diameter piles were specified. The rebar cages inserted into the piles

consequently were also extremely varied in diameter: from 150 mm to 1,35 m. The average depth of the piles was 10 m and the vertical load- ings ranged between 200kN/m to 9 200kN/m. Gauteng Piling used two rigs for the piling excavations: a Williams LDH digger with 5,5t-m torque, and - for maximum speed - a Soilmec SR30 hydraulic drilling rig on tracks, fitted with high-tech comput- erised controls,” Geyer stated. Steel reinforcement employed for

the piles ranged fromfour high tensile strength steel rods, with 12mmdiam- eter (4Y12), to 13 high tensile strength rods with 32mm diameter (13Y32). The spirals of mild steel were 8mm in diameter with a 200 mm pitch. The team included: the main con- tractor: Tri-Star; architects, Boogert- man + Partners; quantity survey- ors: Del QS; civil and structural engineers: DG Consulting Engi- neers; and groundwork contractors: Pentagon. ■

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