Mine prop

Details Mine prop Mine prop

2005-06-28

2005-06-28

Lee, Jong-Suk (James) (Department: 3673)

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

C405S290000, C405S292000, C405S301000, C248S351000, C248S354200, C248S357000, C299S011000, C299S031000

Reexamination Certificate

active

06910834

ABSTRACT:
A mine prop is comprised of an elongate tube having a slenderness ratio that would generally allow buckling or kneeling of the elongate tube when exposed to a sufficient axial force. A plurality of elongate support members having a length less than the elongate tube are attached to the tube to prevent buckling or kneeling of the elongate tube along the portion of the tube to which the elongate support members are attached. The portions of the tube that are unsupported by the elongate support members define one or more yieldable zones proximate at least one end of the tube. A compressible filler material is disposed within at least portion of the tube to support yielding in the yieldable zone.

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Yield test report, conducted by NIOSH Safety S tructures Testing Laboratory for Jennmar Corporation, relating to Big John™ Yield Props—dated Feb. 5, 2002.
Product information brochure produced by Burrell Mining Products International, Inc. for “The Can© Cribbing System.”.
Product information sheet produced by Strata Products (USA), Inc. For “Propsetter© Yieldable Support System.”.

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