Yieldable roof support for mine passages and the like

Details Yieldable roof support for mine passages and the like Yieldable roof support for mine passages and the like

1981-06-17

1984-04-17

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405290, E21D 1544

Patent

active

044431341

ABSTRACT:
A yieldable roof support structure for mine passages and the like includes inner and outer hollow segments attached end-to-end to form a closed or an opened support frame, the segments including separating walls defining chambers associated with the joined together ends so that, upon application of pressure to the chambers, the joined segments are moved apart to facilitate a disassembly of the frame.
Alternatively, piston and cylinder units may span the joined ends of the segments for separating them upon the application of external pressure.

REFERENCES:
patent: 3800549 (1974-04-01), Lobbe
patent: 4010616 (1977-03-01), Lovat
patent: 4167361 (1979-09-01), Petro et al.
patent: 4302133 (1981-11-01), Althaler et al.
patent: 4307981 (1981-12-01), Weirich et al.

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