Prestressing of mine props

Details Prestressing of mine props Prestressing of mine props

1996-01-16

1997-09-23

Graysay, Tamara L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405288, 254 93HP, 299 11, E21D 1532

Patent

active

056697392

ABSTRACT:
The mine prop prestressing device (10) has a tube (12), a cup-shaped member (14) inside the tube which has a base (18) and a cylindrical side wall (20) fixed internally to the wall of the tube. A counter-member is also fixed to the tube in opposition to the cup-shaped member, and a valved inlet leads through the wall of the tube for the purpose of introducing a pressurised fluid into the tube between the base of the cup-shaped member and the counter-member. If the fluid is under sufficiently high pressure, the base of the cup-shaped member and the counter member are deformed apart from one another. The counter-member is typically in the form of an identical or similar cup-shaped member (14). The device (10) is a component part of a mine prop which includes a plunger (36, 38) inserted slidably into the tube so as to locate in a cup-shaped member. When pressurised fluid is introduced into the tube, the plunger is driven telescopically out of the tube.

REFERENCES:
patent: 1752101 (1930-03-01), Meutsch
patent: 3799504 (1974-03-01), Vaughen
patent: 4167361 (1979-09-01), Petro et al.
patent: 5178367 (1993-01-01), Vaughen

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