Clavos Raise Lining
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.
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.
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. 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 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.
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.