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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.

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. 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.

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.

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