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ANCHORAGE
Critical ParametersCritical Parameters
• Bolt Type
• Strength– Grade– Diameter
• LengthLength
• Density (spacing)Density (spacing)
• PlatesPlates
Bolt LengthBolt Length
Industry Rule Of Thumb: Industry Rule Of Thumb: Bolt length should be Bolt length should be half the supported span dimension.half the supported span dimension.
Bolt LengthBolt Length
Bolt DensityBolt Density
FRICTION ANCHORED SUPPORT
POINT ANCHORED SUPPORT
10’
Anchorage 1 Ton/Ft (1 Ton)
Anchorage 10 Tons
1’
Bolt DensityBolt Density
Fall of splitset supported back in an underground limestone mine
Bolt LengthBolt Length
Failure of Mechanical BoltsFailure of Mechanical Bolts
Installation Angle
?
Installation Angle
Install Bolts Install Bolts Perpendicular to the Perpendicular to the
Rock Surface for Rock Surface for Pattern BoltingPattern Bolting
(Except Where Key (Except Where Key Block Bolting is Block Bolting is
Required)Required)
Pattern Boltingversus
Spot Bolting
Friction Anchored BoltsFriction Anchored Bolts
Resin Anchored BoltsResin Anchored Bolts
Surface ControlSurface Control
Primary SupportPrimary Support
Bolt Across JointsBolt Across Joints
Bolt Perpendicular To Joints
SURFACE CONTROL PLATES, CHANNELS &
MATTS
GRADES OF PLATES
K2, K3 & K4
2 = 20,000 LBS
K = LETTER DENOTES
NAME OF
MANUFACTURER
Donut Bearing Plate
Donut HeaderPlate
8” x 8” Bearing Plate
6” x 10” Low Profile Header Plate
6” x 16” Low Profile Header Plate
6” x 16” Low Dome Header Plate
6” x 6” Flat Plate
4” x 9” ChannelPlate
6” x 6” Dome Plate
6” x 6”SAF Dome Plate
MATS
USED TO CONTROL ROOF SLOUGHING
PIZZA PANS
CHANNELSUSED THE SAME AS A CROSSBAR FOR ROOF
CONTROL
TENSAR W/WO BACKING
Plate SizeSize and Type of Bearing Plate Should
Correspond to Ground Conditions
Soft Rock SkinSoft Rock Skin
Weak RockWeak Rock
Soft Rock Skin Soft Rock Skin
Large Plate(Covers More Area)
Less Damage to Surface
Large Plate(Covers More Area)
Less Damage to Surface
Small Plate(Covers Less Area)
Damage to Surface
Small Plate(Covers Less Area)
Damage to Surface
Soft Rock SkinSoft Rock Skin
Back Overstressed(Rock Falls Out)
Loose Plate-No Tension
Back Overstressed(Rock Falls Out)
Loose Plate-No Tension
PROPER INSTALLATION REQUIRESPROPER INSTALLATION REQUIRESCORRECTLY DRILLED HOLESCORRECTLY DRILLED HOLES
Hole LengthHole Length
( Resin Systems)( Resin Systems)
Too Short Loose PlateToo Short Loose Plate
Too Long Short Grout LengthToo Long Short Grout Length
Hole DiameterHole Diameter
Too Small Insertion ProblemsToo Small Insertion Problems
Too large Less AnchorageToo large Less Anchorage