Measuring Mine Roof Bolt Strains

Details

• Personal Author:
  Steblay, Bernard J.
• Description:
  A mine roof bolt and a method of measuring the strain in mine roof bolts of this type are disclosed. According to the method, a flat portion on the head of the mine roof bolt is first machined. Next, a hole is drilled radially through the bolt at a predetermined distance from the bolt head. After installation of the mine roof bolt and loading, the strain of the mine roof bolt is measured by generating an ultrasonic pulse at the flat portion. The time of travel of the ultrasonic pulse reflected from the hole is measured. This time of travel is a function of the distance from the flat portion to the hole and increases as the bolt is loaded. Consequently, the time measurement is correlated to the strain in the bolt. Compensation for various factors affecting the travel time are also provided. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Mine Shafts Mining Industry Roof Bolts Roof Supports Ultrasonic Testing
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Other
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DRC - Denver Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-9
• NIOSHTIC Number:
  nn:10003998
• Citation:
  US Pat 4,601,207 1986 Jul; :1-9
• Federal Fiscal Year:
  1986
• Peer Reviewed:
  False
• Source Full Name:
  United States Patent 4,601,207
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d5809fa70b4ad693bc0ca3b7afa2746c5cdd40ccc76a70b058a0287270556b940d5b4c058b63880224906de3f0efeddab01160857b833ac1ddfe91c72debde87
• Download URL:
  https://stacks.cdc.gov/view/cdc/219532/cdc_219532_DS1.pdf
• File Type:
  [PDF - 1.17 MB ]