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ANCHORAGE

ANCHORAGE. Critical Parameters. Bolt Type Strength Grade Diameter Length Density (spacing) Plates. Bolt Length. Industry Rule Of Thumb: Bolt length should be half the supported span dimension. Bolt Length. Bolt Density. 1’. Anchorage 1 Ton/Ft (1 Ton). Anchorage 10 Tons.

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ANCHORAGE

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  1. ANCHORAGE

  2. Critical Parameters • Bolt Type • Strength • Grade • Diameter • Length • Density (spacing) • Plates

  3. Bolt Length Industry Rule Of Thumb: Bolt length should be half the supported span dimension.

  4. Bolt Length

  5. Bolt Density

  6. 1’ Anchorage 1 Ton/Ft (1 Ton) Anchorage 10 Tons 10’ FRICTION ANCHORED SUPPORT POINT ANCHORED SUPPORT

  7. Bolt Density

  8. Fall of splitset supported back in an underground limestone mine

  9. Bolt Length

  10. Failure of Mechanical Bolts

  11. Installation Angle ?

  12. Installation Angle Install Bolts Perpendicular to the Rock Surface for Pattern Bolting (Except Where Key Block Bolting is Required)

  13. Pattern Bolting versus Spot Bolting

  14. Resin Anchored Bolts Primary Support Friction Anchored Bolts Surface Control

  15. Bolt Across Joints

  16. Bolt Perpendicular To Joints

  17. SURFACE CONTROL PLATES, CHANNELS & MATTS

  18. GRADES OF PLATES K2, K3 & K4 2 = 20,000 LBS K = LETTER DENOTES NAME OF MANUFACTURER

  19. Donut Bearing Plate Donut Header Plate

  20. 8” x 8” Bearing Plate 6” x 10” Low Profile Header Plate 6” x 16” Low Profile Header Plate

  21. 6” x 6” Flat Plate 6” x 16” Low Dome Header Plate 4” x 9” Channel Plate

  22. 6” x 6” Dome Plate 6” x 6” SAF Dome Plate

  23. MATSUSED TO CONTROL ROOF SLOUGHING

  24. PIZZA PANS

  25. CHANNELSUSED THE SAME AS A CROSSBAR FOR ROOF CONTROL

  26. TENSAR W/WO BACKING

  27. Plate Size Size and Type of Bearing Plate Should Correspond to Ground Conditions

  28. Soft Rock Skin Weak Rock

  29. Small Plate (Covers Less Area) Damage to Surface 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 Soft Rock Skin

  30. Back Overstressed (Rock Falls Out) Loose Plate-No Tension Back Overstressed (Rock Falls Out) Loose Plate-No Tension Soft Rock Skin

  31. PROPER INSTALLATION REQUIRES CORRECTLY DRILLED HOLES Too Short Loose Plate Too Long Short Grout Length Too Small Insertion Problems Too large Less Anchorage Hole Length ( Resin Systems) Hole Diameter

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