New Afton Raises
New Afton Raises -
CUSTOMER: New Gold
LOCATION: Kamloops, British Columbia
PROJECT: To line two separate vertical raises, each 3.5 m (12 ft) in diameter and two unique depths of 300 m (950 ft) and 420 m (1430 ft). (which held the record for the deepest raise lined to date in the world)
CHALLENGES: Immense weight, (due to depth), of all the infrastructure on the support frame.
Portable systems were required to supply air and water.
A winch and cable rating that would accommodate the system.
Applying shotcrete 5 cm (2 in) thick uniformly and being able to record & view proof of application.
PROJECT PLAN: Engineer a enhanced ‘structural frame’ above the raise culvert which would support the immense loads of the ‘raise robot’, hose, cable, and material delivery systems.
A multi-camera system to visually inspect and ensure delivery of the correct amount of shotcrete.
The Multicrete Raise Robot™ is a remotely controlled robotic assembly for the spraying of shotcrete; used in shafts and raises of subterranean excavations. This robotic unit is designed for use in mines and on large civil construction projects.
Standard Multicrete Raise Robot™ is designed for use in raises a minimum of 1.5 meters diameter up to a maximum of 5.5 meters diameter. Spring-loaded retractable arms stabilize the Multicrete Raise Robot™ and allow for undulations along the interior surface of the raise.
The Multicrete Raise Robot™ is lowered by means of a heavy-duty incremental winching system. This system allows for variable speeds from 5 cm/minute up to 6 m / minute. During its descent, the RAISE ROBOT washes (hydro-blasts) the interior surfaces. On its return, the unit commences spraying shotcrete in a uniform single pass. The electric motor on the spray head allows for 360° non-stop rotation.
The Multicrete Raise Robot™ is used in conjunction with the AL 257 electric powered shotcrete machine mounted on a Multicrete Integral Predampener. Predampened material is conveyed through 50 mm. diameter heavy duty hose for the remote application of shotcrete via the Multicrete Raise Robot™.
At surface level, technicians monitor the progress of the Multicrete Raise Robot™ via video display. This allows for the rate of application to be modified without personnel entering the raise.
All the required equipment, spares and accessories can be compacted for shipment into a 20' sea container. The Multicrete Raise Robot™ collapses to just 1.8 meters in height, 2.7 meters in length and 1.8 meters in width for ease of transport.