Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Roof Bolt Anchorage Quality Indicator/tension Decay Equalizer.

Authors
Mahyera-A; Jones-AH
Source
NTIS: PB 84-231455 Available for Reference At Bureau Libraries :158 pages
Link
NIOSHTIC No.
10004045
Abstract
This report presents the results of a laboratory and field research program to design and develop a torque-thrust controlled bolter with the capability to (1) predict the "quality of anchorage" attained while installing mechanical anchor roof bolts and (2) improve the uniformity and tension levels achieved among a group of roof bolts. The prediction accuracy of the anchorage quality algorithm ranged from low to moderate because of the complexity and variability of the phenomena involved. The best roof support with mechanical anchor bolts was achieved by simply installing them under proper torque-thrust control with a hardened washer under the bolthead. The results showed a threefold uniformity improvement and a 75% increase in mean tension levels over conventionally installed roof bolts.
Publication Date
19830101
Document Type
CP; Final Contract Report;
Fiscal Year
1983
NTIS Accession No.
PB84-231455
NTIS Price
A09
Identifying No.
OFR 148-84
NIOSH Division
SRC;
Source Name
NTIS: PB 84-231455. Available for Reference At Bureau Libraries
Performing Organization
Terra Tek, Inc.
TOP