ICGCM Papers:
Equipment Design and New Technologies
 
 
Use of a Laser Grid System for Accurate Roof Bolt Location
35th International Conference on Ground Control in Mining
Use of a Laser Grid System for Accurate Roof Bolt Location
by
William Kendall, J.H. Fletcher & Co., Huntington, United States
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Equipment Design and New Technologies
[Author] William Kendall, J.H. Fletcher & Co., Huntington, United States
[Abstract] 
Key Conclusions:
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Relatively simple and inexpensive laser grid systems can be beneficial in assisting accurate roof bolt location. The concept is applicable across the full range of roof bolters from low to high seams and from single boom to multiple boom bolters.
Key Findings:
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15 of the systems have been installed in South African coal mines with good results. Fletcher has submitted the system to MSHA for approval in the USA
Objective of the Paper:
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This paper will describe a laser grid system which has been developed by J.H. Fletcher and a South African Company - Monitech, to aid in proper machine positioning in the heading and proper bolt spacing. The system can also show when an entry is over width requiring additional roof support.
Problem Statement:
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A tremendous amount of research, analysis, and engineering time is used to design a proper roof support system including the type and location of the roof bolts. Unfortunately the actual location of where the roof bolts are installed is typically left to visual estimates by the operator. This frequently results in either the operators overestimating spacings and installing more roof bolts than required increasing cost and reducing efficiency; or underestimating spacings resulting in excessive bolt spacing and potential roof failure.