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Northern Centre
for Advanced
Technology Inc.
at Cambrian College

1400 Barrydowne Rd
Sudbury, Ontario
P3A 3V8

(705) 521-8324

(705) 560-9741


January 26 & 27, 1999
Skema Friction Stabilizers

Bill Quesnel, Len Leblanc - PHQ

Eric Nelson Consultant

Mark Poulin, Doug Luhta, Mike Mooney - NORCAT

Installation, pull test and removal of Skema split tube assemblies.

NORCAT Underground Centre, Onaping, Ontario

Test # Bolt Diam. Bolt Length Bit Diam. Pull Test Results
1 1.335" 6ft. 1.280" 6.5tons (ss-33 equivalent)
2 1.337" 6ft. 1.280" 9.5 tons (ss33 equivalent)
3 1.335" 6ft. 1.280" 6.0 tons (ss-33 equivalent)
4 1.555" 6ft. 1.364" 8.0 tons (ss-39 equivalent)
5 1.560" 6ft. 1.364" 11.0 tons (ss-39 equivalent)

1. Holes were drilled by jackleg (115 psi drill pressure).  Installation of split set tubes was also by jackleg using generic style driver tool.  This caused some flaring of ring ends & loss of impact energy.

2. Pull tests were conducted using Enerpac RCH 302 center hole jack and claw style pull assembly.    Instructions Hydraulic Rock Bolt Tester PDF

3. Tubes #1 & #5 were marked & removed for NORCAT corrosion testing

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Last modified: March 14, 2017