Current Pipejacking Projects at Esor

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2014   Progress advances in the construction of key pipeline

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 Naudé, 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 says.

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.

Progress advances in the construction of key pipeline

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2014   Esor Pipejacking called in to tricky pipeline project

Esor Pipejacking is acting as sub-contractor in a project involving a search for a pilot

hole used in the laying of a Sasol gas pipeline.

The horizontal directional drilling pilot hole had been made by a previous contractor

as part of the deviation of the existing 8¨ Uncle Charlie’s to Lawley pipeline where the

conduit crosses under the Klipriver near Nancefield, Johannesburg.

The pilot hole was found to be in very close proximity to the southern bank of the river and the main contractor, Frontier Pipe Lines (Pty) has enlisted Esor’s assistance in exposing the pilot hole. The existing hole will be reamed and the steel gas pipeline installed along the remaining length of the drill path.

Esor’s task in locating the hole is by no means easy. It lies approximately 12m below ground and only 14m from the river bank. The first decision was to sink a 12m-deep shaft by drilling and grouting micro piles onto the shaft perimeter. In addition, six dewatering holes were drilled down to a depth of 14m and pumps installed.

The shaft excavation, which is ongoing, has proved to be a major task. This is owing to difficult rock formations and large volumes of water, and involves the use of a mini bobcat excavator, which was lowered into the shaft using a 35 tonne crane.

Esor Pipejacking called in to tricky pipeline project