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Shaft Drilling: State-of-the-art.
NTIS: PB/220-368/5 Available for Reference At Bureau Libraries :169 pages
This report covers bored shaft up to 25 feet in diameter by both blind drilling and raise drilling. Included are discussions on site selection and preparation, drilling equipment and operations, grouting methods, hole lining techniques, and problems unique to shaft boring in coal provinces. The appendix contains a section on novel drilling techniques, a tabulation of mine shafts drilled to date, and a comprehensive bibliography.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/220-368/5; Available for Reference At Bureau Libraries
James H. Cobbs, Engr.
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division