Wonderboom Culvert Jack

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Progress on the Wonderboom/Rooiwal bulk pipeline has advanced considerably with the recent completion of three important underground tunnels.

Pretoria motorists driving along Steve Biko Drive and Lavender Road over the past three months, would have been blissfully unaware that a team far beneath their wheels was digging one of the biggest underground precast culverts in South Africa.

According to project manager Anton Naude, each tunnel is 4,9 metres high and 2,7 metres wide, while the tunnel under Lavender Road is 40m in length supported by no fewer than 32 precast concrete structures, weighing 11 tonnes each.

"A hydraulic jack was used to push each structure into the tunnel which is wide enough to accommodate two small cars side by side.  A significant feature of the project was that the pipeline was laid without any disruption of traffic on the city's main arteries," he said.

The pipeline is a key component of Pretoria's 50-year development project and will supply water to Rainbow Junction and other industrial and residential growth areas to the north of the city.  The R130 million project began in 2013 and is scheduled for completion in 2015.

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