Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent
1989-07-19
1990-08-07
Reese, Randolph A.
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
405297, 405298, 91170MP, 299 33, E21D 2316
Patent
active
049463160
ABSTRACT:
A method and device is provided for the moving of a shield-type support trestle 1 having stamps 4, 5 arranged between a roof pressure cap 3 and a lying skid 2, a pushing ram 6 is in the lying skid 2, and control valves 11, 12, 13, 14 for controlling the desired functions of the shield-type support trestle 1. The stamps 4, 5 have an inlet valve 22 and a discharge valve 4. A pressure line 40 is provided between control valve 13 and the pushing ram 6. A valve 51 is provided which is controlled by the pressure in the pressure line 40 and by which interconnects stamp pressure chambers. A manometric switch 48 is arranged on the pressure line 40 and activates an electronic control device 42. In lines 53, 55, and 29 between the stamp pressure chambers and the return line 18, an unlockable reflux valve 54 is provided which is actuated through the electronic control device 42 and the discharge valve 24. This device allows the trestle to be moved with a constant support pressure in spite of varying surface conditions in a mine.
REFERENCES:
patent: 3207041 (1965-09-01), Phillips
patent: 3821880 (1974-07-01), Weirich et al.
patent: 4379662 (1983-04-01), Block
patent: 4440522 (1984-04-01), Dettmers et al.
patent: 4465408 (1984-08-01), Krieger et al.
Schulze-Heiming Herman-Josef
Watermann Willy
Klockner-Becorit GmbH
Reese Randolph A.
Ricci John A.
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