1. ANCHORAGE

2. Critical Parameters Bolt Type Strength –Grade –Diameter LengthLength Density (spacing)Density (spacing) PlatesPlates

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

4. Bolt Length

5. Bolt Density

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

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

13. Pattern Bolting versus Spot Bolting

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

15. Bolt Across Joints

18. Bolt Perpendicular To Joints

19. SURFACE CONTROL PLATES, CHANNELS & MATTS

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

21. Donut Bearing Plate Donut Header Plate

22. 8” x 8” Bearing Plate 6” x 10” Low Profile Header Plate 6” x 16” Low Profile Header Plate

23. 6” x 16” Low Dome Header Plate 6” x 6” Flat Plate 4” x 9” Channel Plate

24. 6” x 6” Dome Plate 6” x 6” SAF Dome Plate

25. MATS USED TO CONTROL ROOF SLOUGHING

26. PIZZA PANS

27. CHANNELS USED THE SAME AS A CROSSBAR FOR ROOF CONTROL

28. TENSAR W/WO BACKING

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

30. Soft Rock Skin Weak Rock

31. 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

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

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