Ritchies, the specialist geotechnical division of Edmund Nuttall, has added a new rig to its fleet of seven working in Gibraltar. The firm is carrying out a £14. 2M contract to decommission the east side water catchments in the colony for Defence Estates.
The rig comprises a Boart Longyear power pack, drill mast and control panel mounted on a tracked unit. Each track has been converted to provide 8. 5t of propulsion with a breaking capacity of 10t. This allows the rig to ascend the 600m, 35degrees slope under its own power at a rate of 3m per minute. Two hydraulic lines attached to the top of the slope ensure fail-safe operation. The rig is operated by a crew of two and is expected to complete the installation of four anchors per day.
About 9000 ground nails will be drilled, installed and grouted as part of a two year slope stabilisation contract.
Designed and built in the Nuttall plant division's Kilsyth Depot in Scotland, the new rig has been christened 'Heineken' because 'it reaches the parts other rigs cannot reach' (ouch - Ed).