Safety Standards for the Use of Roof-Bolting Machines in
Underground Mines [12/09/1997]
Volume 62, Number 236, Page
64789-64790=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF LABOR
Mine Safety and Health Administration
30 CFR Parts 57 and 75
RIN 1219-AA94
Safety Standards for the Use of Roof-Bolting Machines in
Underground Mines
AGENCY: Mine Safety and Health Administration, Labor.
ACTION: Advance notice of proposed rulemaking.
-----------------------------------------------------------------------
SUMMARY: Recent accidents in underground coal mines involving roof-
bolting machines indicate the need to modify the design of such
machines and require additional safety features. The accident history
involving use of these machines prompted the Mine Safety and Health
Administration (MSHA) to evaluate roof-bolting machines currently in
use, primarily focusing on potential hazards to the machine operators
during the drilling and roof-bolt installation procedures. As a result
of the evaluation of accidents, MSHA is in the early stages of
establishing design criteria and operating procedures for roof-bolting
machines in underground mines. This notice seeks to obtain additional
information and data on machine design, operating procedures, and
miners' experiences with roof-bolting machines.
DATES: Submit comments on or before February 9, 1998.
ADDRESSES: Send comments to the Office of Standards, Regulations, and
Variances, MSHA, Room 631, 4015 Wilson Boulevard, Arlington, Virginia
22203. Commenters are encouraged to submit comments on a computer disk
or via e-mail to psilvey@msha.gov along with an original hard copy or
via telefax to: 703-235-5551.
FOR FURTHER INFORMATION CONTACT: Patricia W. Silvey, Director, Office
of Standards, Regulations, and Variances, 703-235-1910.
SUPPLEMENTARY INFORMATION:
I. Background
An estimated 2,500 roof-bolting machines are currently in use at
underground coal, potash, trona, and salt mines in the United States.
The machines are used to install many types of roof bolts and other
support materials into the mine roof.
Between January 1984 and April 1994, 16 fatal accidents occurred
involving the operation and maintenance of roof-bolting machines. In a
six-week period in early 1994, three operators of roof-bolting machines
were killed while operating the machines in coal mines. Two were
crushed between the drill head and machine frame while bolting the rib,
and the other was crushed between the drill head boom and canopy when
the fast-feed boom lift lever was inadvertently activated. Responding
to these accidents, on April 4, 1994, MSHA formed and chaired the Roof-
Bolting-Machine Committee (committee) with representatives from the
U.S. Bureau of Mines and the West Virginia Office of Miners' Health,
Safety, and Training, to review accident data, to visit mines to
observe roof-bolting practices, and to interview miners. Additionally,
the committee met with four major roof-bolting machine manufacturers,
who provided data and technical information on machine design and
function.
The study focused on boom and mast-type roof-bolting machines and
did not include continuous mining machines with integral bolters.
Primarily, the committee examined the potential hazards to the roof-
bolter operators during the drilling and roof-bolt installation
procedures.
Following this study, the committee issued a Report of Findings
(Report) on roof bolter safety on July 8, 1994 outlining problems and
potential solutions for reducing roof-bolting accidents. These findings
are summarized below. Copies of the Report are available to the public
at all MSHA district offices; from MSHA's Office of Standards,
Regulations, and Variances, by calling 703-235-1910; and through MSHA's
Home Page on the Internet, at http://www.msha.gov.
The committee was reconvened on October 21, 1996. The purpose of
this meeting was to determine whether any new technology or design
changes had occurred beyond those included in the committee's 1994
Report. The committee identified one design change, a new valve
developed by a manufacturer to prevent its two-handed, fast-feed valve
from being bypassed.
The committee also reviewed MSHA accident data for the period from
April 1994 through December 1996. (The report covered January 1984
through March 25, 1994.) Although there have been numerous accidents
and injuries, there have been no fatalities related to the operation of
roof-bolting machines in either coal or metal and nonmetal mines since
the issuance of the roof-bolter safety report. An analysis of the data
confirmed that accidents directly related to the operation and
maintenance of roof-bolting machines continue to occur.
II. Findings
The committee identified several roof-bolting-related problem areas
which may have contributed to or caused the accidents. These included:
(1) inadvertent actuation of controls, particularly the drill-head,
fast-feed control lever, which contributed to approximately 50 percent
of the fatal accidents; (2) work position location; (3) retrieval of
drill steel; (4) resin insertion; (5) location of controls; and (6)
control malfunction. In addition, the committee identified various
other areas for improvement in future roof-bolting machine design.
III. General Issues
The committee developed ten possible solutions to address problems
with existing roof-bolting machines. The solutions are as follows:
1. Installing two-handed, fast-feed controls that prevent actuation
of drill-head feed controls while the machine operators are positioned
in pinch-point areas.
[[Page 64790]]
2. Installing a drill-head raise shutoff. This device would be
installed in the drill-head raise pinch point and would immediately
stop the hydraulic oil flow to the drill-head feed cylinder, thus
preventing the feed cylinder from being raised and accidentally
injuring the operator.
3. Installing auxiliary controls for the canopy raise/lower and
boom swing functions to eliminate the pinch point where operators have
been injured by the swinging boom.
4. Installing control guarding or double-acting fast-feed controls,
or both, to prevent inadvertent activation.
5. Providing visual identification of pinch-point areas to alert
the operator of the danger area.
6. Installing self-centering controls to prevent continued machine
movement when the control lever is released.
7. Securing the rotating drill steels or wrench to prevent the
operator from becoming entangled in these moving machine components.
8. Installing insertion/retrieval devices (resin insertion tools or
drill steel retrieval) to eliminate the need for the operator to extend
his body into a pinch point or climb onto the boom.
9. Standardizing location of controls to prevent inadvertent
actuation of controls due to different roof-bolting machine control
layouts.
10. Conducting a pre-operational inspection of machine controls to
detect malfunctions prior to operation.
These possible solutions are intended to address the problems with
roof-bolting machines and to prevent accidents. MSHA requests miners,
mine operators, manufacturers, and other interested parties to comment
on the qualitative and quantitative potential benefits and costs of
compliance associated with adoption of these solutions, and any
alternatives to these solutions.
Although MSHA is considering development of a proposed rule to
address the hazards associated with roof-bolting machines, the Agency
also solicits comment from the public on alternatives, other than
rulemaking, to address safety hazards on roof-bolting machines used in
the mines today.
IV. Specific Issues
Because a roof-bolting machine standard would apply to both coal
and metal and nonmetal mining industries, commenters should provide
specific justification for their positions based on sound engineering,
work practices, and mining conditions. MSHA requests comment on the
technological and economical feasibility and benefits of the solutions
suggested in the Report of Findings and in this notice. Specifically,
MSHA seeks input on the following issues: the current availability of
technology to retrofit existing machines with two-handed fast-feed
controls, double-acting fast-feed controls, control guarding, visual
identification markers to alert the operator of the pinch point area,
self-centering controls, or insertion/retrieval devices; the impact on
the design and operation of existing machines if retrofitting were to
be required; the impact of available technology on newly-purchased
machines; the costs to manufacturers and mine operators of available
technology; and any other information that is relevant to the findings
in the Report. Commenters are encouraged to provide information
specific to their mining conditions.
V. Impact
Executive Order 12866 requires that regulatory agencies assess both
the costs and benefits of intended regulations, and propose regulations
on the basis that the benefits justify the costs. Regulatory agencies
also are required to base decisions on the best reasonably obtainable
scientific, technical, economic, and other data and information
concerning the need for and the consequences of the proposed
regulations.
MSHA is in the early stages of developing a proposed rule. The
Agency anticipates that the benefit of a safety standard addressing
design criteria and operating procedures for the use of roof-bolting
machines in underground mines would be the prevention of fatalities and
injuries which occur when these machines are operated.
VI. Public Participation
MSHA requests comments on the specific issues addressed in this
notice as well as those addressed in the Report of Findings. Interested
parties are particularly encouraged to be as specific as possible in
addressing each of MSHA's possible solutions and in suggesting
alternatives to these solutions. MSHA also requests that commenters
include specific examples and cost estimates to support their rationale
to assist the Agency in evaluating and analyzing their comments.
List of Subjects in 30 CFR Parts 57 and 75
Mine safety and health, Underground mining.
Dated: December 3, 1997.
J. Davitt McAteer,
Assistant Secretary for Mine Safety and Health.
[FR Doc. 97-32203 Filed 12-8-97; 8:45 am]
BILLING CODE 4510-43-P
|
