Flexible roof drill for low coal. Final report

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5411252

Brummert, L V

Contract number DE-AC22-74ET11205 provided for the continued testing of a flexible roof drill system which allows the operator to drill roof bolt holes longer than seam height. The system was mounted on a modified Fletcher LTDO bolting machine. The objective of the contract is to establish the reliability of the flexible drill from extended life testing in an operating coal mine and by laboratory life testing. The reliability goal is 1000 mean-holes-between-failures. The underground test was conducted in the GEX-Colorado, Incorporated, Roadside Mine in Palisade, Colorado. The underground test concluded with the drilling for and installation of 12,361 four-foot roof bolts. The laboratory test consisted of the simulated drilling of 20,000 eight-foot long holes. The reliability goal was achieved with an associated confidence level greater than 99%.

• Research Organization: Bendix Corp., Englewood, CO (USA)
• DOE Contract Number: AC22-74ET11205
• OSTI ID: 5411252
• Report Number(s): DOE/ET/11205-T10; ON: DE82006278
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
COAL DEPOSITS
COAL MINING
COAL SEAMS
DIMENSIONS
DRILLING EQUIPMENT
EQUIPMENT
GEOLOGIC DEPOSITS
INSTALLATION
MINERAL RESOURCES
MINING
MINING EQUIPMENT
PERFORMANCE TESTING
RECOMMENDATIONS
RELIABILITY
RESOURCES
ROOF BOLTS
TESTING
THICKNESS
UNDERGROUND MINING