Raise Robotic Shotcreting
CLAVOS RAISE LINING – Robotic Shotcreting
CUSTOMER: St. Andrew Goldfields
LOCATION: Matheson, Ontario (East of Timmins, Ontario)
PROJECT: To line a 3.3 m (11 ft) diameter raise 121 m (400 ft) deep with an angle of decline at 870.
CHALLENGES:
Mobilizing to a remote location with limited access.
Portable systems were required to supply air and water.
Providing a sheltered work area 12m x 24m over the raise culvert.
Applying shotcrete 5 cm (2 in) thick uniformly along the raise and protruding rock bolts posed hazards for robotic spraying equipment.
Poor visibility within the raise.
PROJECT PLAN:
Place two sets of 40 ft. containers parallel to each other and 12 meters apart.
Erect a ‘cover-all’ shelter to span the containers and enclose the open work are between.
Engineer a ‘structural frame’ above the raise culvert to support the hoist system, remotely operated ‘Multicrete Raise Robot™’, material delivery hoses and electrical cables.
The Multicrete Raise Robot™ is a remotely controlled robotic assembly for the spraying of shotcrete; used in shafts and raises of subterranean excavations. Multicrete Raise Robot™ 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.
OPERATING PRINCIPLE:
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 Multicrete 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.
SHIPMENT:
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.
