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Achieving Uniform-high-tensions in Mechanical-anchor Bolts.

Authors
Mahyera-A; Jones-AH
Source
Available for Reference At Bureau Libraries :122 pages
Link
NIOSHTIC No.
10003311
Abstract
Toward the goal of achieving uniform high tensions in roofbolts to provide superior roof support for extended periods, mechanical anchor bolts were installed in a mine in eight different ways -- under torque thrust control with and without hardened washers, belleville washers, and tension equalization; and in a conventional manner with and without hardened washers. The various bolt groups were analyzed in terms of tension uniformity and mean tension levels. Installing the bolts accurately with hardened washers under the bolthead, and with proper torque control, resulted in the most uniformly tensioned bolts--a coefficient variation of only 14%, an improvement three times over conventional installations. Also, these bolts maintained a high tension level--80% of the installation tension compared with 50% achieved conventionally.
Publication Date
19820101
Document Type
CP; Final Contract Report;
Fiscal Year
1982
NTIS Accession No.
PB84-143718
NTIS Price
A07
Identifying No.
OFR 210-83
NIOSH Division
SRC;
Source Name
Available for Reference At Bureau Libraries
Performing Organization
Terra Tek, Inc.
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