Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1982-09-24
1984-12-25
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405291, E21D 1530, E21D 1544
Patent
active
044900767
ABSTRACT:
An underground support, e.g. for the roof of a mine, has a roof engaging canopy 10 which can be raised and lowered in a controlled manner by hydraulic legs 14. Inflatable flexible membrane means, for example in the form of bags 12, are provided on the upper face of the canopy 10, which shape themselves to the mine roof and distribute loading evenly thereto. Inflatable flexible membrane means may also be used to prevent flushing of loose debris between adjacent supports, and on roadway supports.
REFERENCES:
patent: 2861429 (1958-11-01), Duncan
patent: 3881776 (1975-05-01), Fashbaugh et al.
patent: 3890792 (1975-06-01), Alacchi
Corbin David H.
Dobson Park Industries Plc.
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