Measuring mine roof bolt strains

Details Measuring mine roof bolt strains Measuring mine roof bolt strains

1985-01-11

1986-07-22

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73761, 405259, G01N 2900

Patent

active

046012079

ABSTRACT:
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.

REFERENCES:
patent: 2947279 (1960-08-01), Hohos et al.
patent: 3810385 (1974-05-01), McFaul et al.
patent: 4062227 (1977-12-01), Heyman
patent: 4363242 (1982-12-01), Heyman
patent: 4402222 (1983-09-01), Olson et al.
patent: 4413518 (1983-11-01), Jones
patent: 4445360 (1984-05-01), Treder, Jr.
patent: 4471657 (1984-09-01), Voris et al.

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