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Investigation of Shank Tension in Mine Roof Bolts.

Authors
Swanson-RK; Burkhardt-GL
Source
NTIS: PB/80-210016 :29 pages
Link
NIOSHTIC No.
10001051
Abstract
Samples of 5/8- by 60-inch mine roof bolts were measured under test loads by stress measurement instruments, one a magnetic system and the other an ultrasonic birefringence system. Both were designed to detect shank tensile stress by measurement of the induced compressive stress in the head of loaded, generally higher quality bridge bolts. Results of measurements made on the heads of roof bolts indicate that variations in dimensions and other head variables preclude accurate load determination on a random population of installed bolts by either method. However, the ultrasonic system offers a good prospect for recording a reference value from a specific bolt at the time of installation to be used as a basis for subsequent inspection through the life of the structure. The stress washer would be no more than a reasonably accurate steel collar within which a uniform stress would be developed from the loaded bolt.
Publication Date
19790101
Document Type
CP; Final Contract Report;
Fiscal Year
1979
NTIS Accession No.
PB80-210016
NTIS Price
A03
Identifying No.
OFR 82-80
NIOSH Division
DRC;
Source Name
NTIS: PB/80-210016
Performing Organization
Southwest Research Institute
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