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Shaft Drilling: State-of-the-art.

Authors
Cobbs-JH; Reeder-LR
Source
NTIS: PB/220-368/5 Available for Reference At Bureau Libraries :169 pages
Link
NIOSHTIC No.
10001748
Abstract
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.
Publication Date
19730101
Document Type
CP; Final Contract Report;
Fiscal Year
1973
NTIS Accession No.
PB-220368/5
NTIS Price
A09
Identifying No.
OFR 29-73
NIOSH Division
WO;
Source Name
NTIS: PB/220-368/5; Available for Reference At Bureau Libraries
Performing Organization
James H. Cobbs, Engr.
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