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Air-inflatable Temporary Supports for Coal Mine Roofs.

Authors
Anonymous
Source
NTIS: PB/223-597 Available for Reference At Bureau Libraries :73 pages
Link
NIOSHTIC No.
10001026
Abstract
This report covers development of a temporary support system for coal mine roofs involving the use of overhead rigid spanners supported by pneumatically operated telescoping columns. Test data for individual components as well as for the entire system are reported. Data reported show that the system supports 80-100 pounds of thrust against the mine roof per pound of support as contrasted to a system of conventional mine jacks that support 50 pounds of thrust per pound of jack. As individual components, two of the pneumatically actuated telebeams supported a spanner load of 3 psi over an area of 2 by 18 inches.
Publication Date
19730101
Document Type
CP; Final Contract Report;
Fiscal Year
1973
NTIS Accession No.
PB-223597
NTIS Price
A05
Identifying No.
OFR 56-73
NIOSH Division
SRC;
Source Name
NTIS: PB/223-597; Available for Reference At Bureau Libraries
Performing Organization
Hauser Laboratories
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