The Balfour Beatty VINCI project team had concerns that the use of conventional breakers to reduce the levels for the Guide slab would cause severe fracturing of the sandstone. A J Gammond Ltd were invited to attend a site meeting, where they quickly identified that the use of the breakers was causing fractures of over one metre in depth. The project team agreed that to eliminate this risk they would use the Rock Hawg Surface Miner.
The Rock Hawg was used to reduce the existing surface levels by up to 700mm to create a flat level surface. This was done with the use of GPS Technology and carried out in 3 separate passes over an area of 24m x 42m and was completed in 16 hrs.
The key benefits: Minimising plant and people interface, reduced shock, vibration, dust and noise from precision surface mining enables operations to take place closer to roads and existing structures than would be permitted by conventional breaking, drilling and blasting methods.