SELF THRUSTING QUIET ROCKDRILL
NOISE LEVELS
IN STOPE TESTING
STANDARD S215
QUIET ROCKDRILL
ROOF SUPPORT FOR TABULAR STOPES
a. Maximum loading: 20 ton/leg
b. Energy absorption: 40kJ/m^2
c. Maximum closure speed: 3 m/s
d. Maximum deflection at closure: 150 mm
e. Slow yield: 30 mm/day
f. Slow yield closure: 150 mm (maximum)
g. Preloading: 10 ton
h. Maximum contact stress: 30 MPa
TESTING IN SAVUKA – 40 kJ at 3m/s
ROOF SUPPORT FOR ROCKFALL MINES
END OF WIND PROTECTION SYSTEM
• AN OVERWIND/UNDERWIND SITUATION TAKES PLACE
WHEN THE CONVEYENCE IS PULLED BEYOND ITS OPERATIONAL LIMIT IN THE HEADGEAR OR SHAFT BOTTOM
--------=
MAXIMUM DECELARATION
- OVERWIND: 1g
- UNDERWIND: 2.5g
--------=
MECHANICAL SYSTEM
END OF WIND PROTECTION SYSTEM
SYSTEM DETAIL
• NEW DETACHING MECHANISM ON TOP OF CAGE
• NO ACCIDENTAL DETACHING POSSIBLE
- CYCLIC BENDING PLATE
- STAINLESS STEEL CABLE
RESULTS
CHAIRLIFTS
- Motor size: 25 to 132 kW
- Wheel size: 1200 and 1500
- Length of installation: 200m @ 34° to 1940 @ 4°
- Typical: 900 people per hour (1.5 m/s)
- Low Maintenance
- Ease of operation
- Modern design
SOLID MODEL
FEM PLOT WITH 2.5 SAFETY FACTOR
Harties no 5 shaft
290 m @ 34°
ROOFBOLTING
• Testing of spin to stall resins
– Building of inexpensive resin tester for QA
– Determining effect of:
• Spin speed/time
• Torque
• Moisture
• Bolt profile
• Temperature
• Development of polyurethane bolting system
• Development of spin to stall washers
