Integra Ventilation Shaft has now been completed to a final depth of 394m. Through difficult ground conditions, Abergeldie has successfully drilled down to give Integra coal access to two coal seams.
Two different methods have been used to line the shaft, with an unlined gap, 3m deep, left between the two sections to give access to a second coal seam at the intermediate level. For the upper section of the shaft, steel/concrete composite liners were installed down to a depth of 330m with 5.5m internal diameter. The drill head was then reconfigured and the shaft continued at a reduced internal diameter of 4.9m for a further 60m down to the Hebden coal seam. For this lower section of the shaft, steel liners were placed and grouted into position.
Abergeldie is a civil engineering contractor with over 25 years’ experience providing services in the utilities, energy and infrastructure sectors: the complex infrastructure needed to build better communities.