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261 PIPELINE DV HARRIS TO WORLDS VIEW – PIPE JACKING

JG Afrika was appointed by Umgeni Water to undertake the detailed design and construction supervision of the pipe jacking component of the 261 pipeline.

Concrete sleeves with a 1 678 mm diameter were installed to accommodate a 914 mm diameter steel pipe.

Jacking under the R103 involved a 20 m installation, and was accomplished using one set of jacks housed in a jacking pit. The reception pit was within the mist belt grassland and there was, therefore, limited access to extract the jacking shield.

Jacking under the N3 was undertaken over a distance of 72,5 m and two intermediate jacking stations were required. The first 10 m of excavation revealed that the road was built using rockfill and complicated the process.

The project was completed on time and 6% under budget.