Roof Support Systems
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A Troubleshooting Guide for Roof Support Systems |
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Mechanical Bolts
ERRATIC TORQUE-TENSION
EXCESSIVE TORQUE
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| Possible Cause | Solution |
| A.1 Excessive Thrust | Adjust bolter setting and instruct operator in proper installation procedure |
| A.2 Severe Installation Angle | Use angle compensator if installation angle exceeds 5 degrees |
| A.16 Plate - Bolt Galling | Try using hardened washers or replace bolts and/or plates |
| A.8 Washer Too Soft | Replace washers |
| A.21 Threads Galled On Installation | Determine cause and contact manufacturer |
| A.20 Bolt/Anchor Threads Jam | Determine cause and contact manufacturer |
| A.5 Bail/Support Nut Too Strong | Replace support nut or anchor |
| A.14 Hole Too Short | Drill hole 1" longer than the bolt length |
| A.18 Anchorage Exceeded | Try different type of expansion anchor or use different support system |
| A.9 Defective Threads | Replace bolts or plugs |
| Possible Cause | Solution |
| A.15 Hole Diameter Too Large | Replace bits |
| A.1 Excessive Thrust | Adjust bolter settings and instruct operator in proper installation procedure |
| A.3 Applied Torque Too Low/High | Adjust Bolter Torque Settings |
| A.19 Poor Roof Strata | Try different type of expansion anchor or use different support system |
| A.6 Defective Anchor | Replace anchors |
| A.18 Anchorage Exceeded | Try different type of expansion anchor or use different support system |
| A.14 Hole Too Short | Drill hole 1" longer than the bolt length |
| Possible Cause | Solution |
| A.4 Plate-Bolt Mismatch | Use a higher grade plate |
| Severe Roof Loading | If widespread determine cause and upgrade the support system |
| A.12 Plate Hole Too Large | Use hardened washers or replace plate if out of spec. |
| A.2 Severe Installation Angle | Use angle compensating device if installation angle exceeds 5 degrees |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use a higher grade plate |
| A.3 Applied Torque Too High | Adjust bolter torque setting |
| A.17 Plate/Washer Mismatch | Replace plates or washers |
| A.8 Washer Too Soft | Replace washers |
| A.11 Defective Plate | Replace plates |
| Possible Cause | Solution |
| A.2 Severe Installation Angle | Use angle compensation device if installation angle exceeds 5 degrees |
| Severe Roof Loading | If widespread determine cause and upgrade support system |
| A.17 Plate/Washer Mismatch | Replace washers or plates |
| A.12 Plate Hole Too Large | Use hardened washers or replace plates if out of spec. |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use a higher grade plate |
| A.3 Applied Torque Too High | Adjust bolter torque setting |
| A.8 Washer Too Soft | Replace washers |
| Possible Cause | Solution |
| A.4 Bolt-Plate Mismatch | Use a higher grade plate |
| Severe Roof Loading | If widespread determine cause and upgrade support system |
| A.17 Plate-Washer Mismatch | Replace washers or plates |
| A.12 Plate Hole Too Large | Use hardened washers or replace plates if out of spec. |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use a higher grade plate |
| A.2 Severe Installation Angle | Use angle compensation device if installation angle exceeds 5 degrees |
| A.11 Defective Plate | Replace plates |
| Possible Cause | Solution |
| A.15 Hole Diameter Too Large | Replace bits |
| A.5 Bail/Support Nut Too Strong | Replace bail or support nut |
| A.20 Bolt/Anchor Threads Jam | Determine cause and contact the manufacturer |
| A.9 Defective Threads | Replace bolts or plugs |
| A.6 Defective Anchor | Replace anchors |
| A.7 Bail/Support Nut Too Weak | Replace bail or support nut |
| A.19 Poor Roof Strata | Try different type of expansion anchor or use a different support system |
| Possible Cause | Solution |
| Severe Roof Loading | Use higher grade or larger diameter bolts |
| A.3 Applied Torque Too High | Adjust bolter torque setting |
| A.10 Defective Bolts | Replace bolts |
| A.9 Defective Threads | Replace bolts |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use higher grade or larger diameter bolts |
| A.2 Severe Installation Angle | Use angle compensating device if installation angle exceeds 5 degrees |
| Possible Cause | Solution |
| A.3 Applied Torque Too High | Adjust bolter torque setting |
| A.4 Plate/Bolt Mismatch | Use a higher grade plate |
| A.2 Severe Installation Angle | Use angle compensating device if installation angle exceeds 5 degrees |
| A.12 Plate Hole Too Large | Use hardened washers or replace plates if out of spec. |
| A.17 Plate/Washer Mismatch | Replace washers or plates |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use higher grade plate |
| A.11 Defective Plate | Replace plates |
| Possible Cause | Solution |
| A.14 Hole Too Short | Drill hole 1" longer than the bolt length |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact |
| A.19 Poor Roof Strata | If roof is broken up around the plate use a larger sized plate or reduce the installed load. If this does not correct the problem, try different type of expansion anchor or use a different support system (see A.18 Anchorage Exceeded) |
| A.15 Hole Diameter Too Large | Replace bits |
| A.20 Bolt/Anchor Threads Jam | Determine cause and contact the manufacturer |
| A.18 Anchorage Exceeded | Try different type of expansion anchor or use a different support system |
| Possible Cause | Solution |
| A.3 Applied Torque Too High | Adjust bolter torque setting |
| A.2 Severe Installation Angle | Use angle compensating device if installation angle exceeds 5 degrees |
| A.5 Bail/Support Nut Too Strong | Replace support nut or anchor |
| A.10 Defective Bolt | Replace bolts |
| A.9 Defective Threads | Replace bolts |
| A.20 Bolt/Anchor Threads Jam | Determine the cause and contact the manufacturer |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve the surface contact |
| Possible Cause | Solution |
| Plate Cracks Extending Through The Embossment | Discontinue use and contact manufacturer |
| Small Cracks Around Hole | Evaluate plate/bolt compatibility |
| Possible Cause | Solution |
| A.14 Hole Too Short | Drill hole 1" longer than the bolt length |
| A.20 Bolt/Anchor Threads Jam | Determine the cause and contact the manufacturer |
| A.21 Threads Galled On Installation | Determine the cause and contact the manufacturer |
| A.5 Bail/Support Nut Too Strong | Replace bail/support nut or replace anchor |
| A.6 Defective Anchor | Replace anchor |
| A.9 Defective Threads | Replace bolts or plugs |
| Possible Cause | Solution |
| A.15 Hole Diameter Too Small | Replace bits |
| A.22 Anchor Pre-Expanded | Reset plugs |
| A.5 Bail/Support Nut Too Strong | Replace bail/support nut |
| A.7 Bail/Support Nut Too Weak | Replace bail/support nut |
| A.6 Defective Anchor | Replace anchor |
| Possible Cause | Solution |
| A.8 Washer Too Hard | Replace washers |
| A.2 Severe Installation Angle | Use angle compensation device if installation angle exceeds 5 degrees |
| A.12 Plate Hole Too Large | Replace plates |
| A.23 Irregular Roof Surface | Use wedges and/or cap blocks to improve surface contact or use higher grade plates |
| A.17 Plate/Washer Mismatch | Replace plates or washers |
| Possible Cause | Solution |
| A.19 Poor Roof Strata | Try different type of expansion anchor or use different support system |
| A.3 Applied Torque Too High Or Low | Adjust bolter torque setting |
| A.4 Bolt - Plate Mismatch | Use higher grade plates |
| A.15 Hole Diameter Too Large Or Small | Replace bits |
| A.6 Defective Anchor | Replace anchors |
| Possible Cause | Solution |
| A.13 Limited Thread Engagement | Replace bolts and/or anchors |
| A.21 Threads Galled On Installation | Determine cause and contact manufacturer |
| A.9 Defective Threads | Replace bolts and/or anchors |
| A.6 Defective Anchor | Replace anchors |
