The five week project, which formed part of the Gauteng Freeway Improvement Project (GFIP), was completed by Q&A Coring in August 2011 and involved the drilling of a total of 560 holes – each measuring 41 mm in diameter and 2.7 m in depth – into the bridges along the Rietfontein Interchange where the R21 and N12 freeways cross.
Q&A Coring managing director Henry Dippenaar believes that the company was able to complete the project on time and within budget by making use of custom-designed core barrels supplied by Diamond Products – a leading specialist in the manufacture, assembly and sale of diamond tools and equipment for industrial applications.
