Feb 12, 2018
In late July 2017, Coleman Microtunnelling, a subsidiary of Bothar Group Australia, successfully completed tunnelling for two power plant cooling water lines in Ghana with a Herrenknecht utility tunnelling machine. The new oil-gas power plant puts the supply of electricity for people and business for the country on the West African Atlantic coast on a more solid foundation.
For the construction of these underground sea water intake and outfall tunnels (inner diameter 2 meters) Coleman Microtunnelling, a subsidiary of Bothar Group Australia, ordered a Herrenknecht AVND2000AB utility tunnelling machine. Herrenknecht specially designed the tunnel boring machine with a salvage module for this special application: In the sea-outfall method pipelines are constructed from the coastline into the open sea.
There, the machine has to be recovered under water. The salvage module prevents the machine and the tunnel from flooding. In addition, for cutter tool changes under high groundwater pressure Herrenknecht equipped the machine (outside diameter 2.5 meters) with a hyperbaric chamber.
Two shafts on the coast served as starting point for the jobsite crew and the Herrenknecht AVND for a total of four pipe jacking drives between May and July 2017. In total, they covered a distance of 2,530 meters. First, the tunnelling specialists of Bothar Group Australia’s subsidiary Coleman Microtunnelling produced two tunnels from the two shafts toward the power plant. These 545 and 520 meter long tunnels run under the mainland and connect the sea-outfalls and the power plant.
Brent Jones, Project Manager for Coleman Microtunnelling, was impressed with the Herrenknecht support in Schwanau and the Herrenknecht service team responsible for the region: "We could not have done it without this extraordinary support. All through Christmas the supply of spare and wear parts went smoothly."
Swen Weiner, Area Sales Executive Middle East for the Herrenknecht Business Unit Utility Tunnelling, is certain: "The good project performance for the long sea-outfall drive in Kpone will be a benchmark for the future in the region." The supply of another Herrenknecht machine to the Bothar Group for a next sea-outfall drive in Ghana followed almost seamlessly.
Machine type: AVND2000AB
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