FIELD: mining industry.
SUBSTANCE: device has constant arch support of special profile with tie-rods, spreader hydraulic jacks and a couple of moving arch supports. Moving supports are mounted with possible displacement thereof by hydraulic jack relatively to constant arch support. Both are connected to tie-rods with possible displacement of one tie-rods along chute of others. Al tie-rods form track connection. Each tie-rod has spikes on side surfaces of shelf and apertures for spikes on side surfaces of grooves. Moving arch supports are connected to tie-rods and hydraulic jacks for moving with detachable fixings.
EFFECT: higher efficiency and safety.
7 dwg
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