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Mining Publication: Hydraulic Prestressing Units: An Innovation in Roof Support Technology
Keywords: Pressure Support design and selection
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: August 2004
Authors: TM Barczak, SC Tadolini, P McKelvey
Conference Paper - August 2004
Download PDF Document (0.72 MB)
NIOSHTIC2 Number: 20025349
In: Peng SS, Mark C, Finfinger GL, Tadolini SC, Heasley KA, Khair AW, eds. Proceedings of the 23rd International Conference on Ground Control in Mining. Morgantown, WV: West Virginia University, August 3-5, 2004; :286-294
A new generation of hydraulic mine support prestressing devices has been developed. These thin-walled steel shells are machine-welded and can be inflated with water or any liquid to provide prestressing for a wide variety of roof support products ranging from Can supports to props and cable bolts. With an expansion capability of several inches, depending on the geometry and size of the unit, they can also establish roof contact, eliminating the need for wooden wedges or crib blocks that are commonly used with several standing roof support products. Capable of withstanding pressures from 1,000 to 6,000 psi, these cells are able to transfer roof loading into the support structure without rupturing. A recent development has been the addition of an inexpensive yield valve that provides control of the maximum pressure and load development on the support. This paper examines the performance capabilities of these inflatable prestressing units and their impact on the performance of various support systems, including an evaluation of the overall stiffness of the support system and the load control during yielding of the prestressing unit. Recommendations are made regarding the design requirements of the prestressing unit to optimize the support performance. A summary of mine applications using this technology is provided, with general comments about their impact on ground control.
Image of publication Hydraulic Prestressing Units: An Innovation in Roof Support TechnologyConference Paper - August 2004
Download PDF Document (0.72 MB)
NIOSHTIC2 Number: 20025349
In: Peng SS, Mark C, Finfinger GL, Tadolini SC, Heasley KA, Khair AW, eds. Proceedings of the 23rd International Conference on Ground Control in Mining. Morgantown, WV: West Virginia University, August 3-5, 2004; :286-294
See Also
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
Explosion Pressure Design Criteria for New Seals in U.S. Coal Mines
A Gas Pressure-Based Drift Round Blast Design Methodology
Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Pillar and Roof Span Design Guidelines for Underground Stone Mines
Technology News 482 - Ground Support Safety Training Video
Tests of Fibre-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana
Tying Acceleration and GPS Location Information Together To Create a Mine Management Tool
Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design Features
Page last reviewed: July 20, 2015
Page last updated: July 20, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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