Prefabricated mine overcast arch and the like

Details Prefabricated mine overcast arch and the like Prefabricated mine overcast arch and the like

E - Fixed Constructions

21

D

61/64

E21D 11/18 (2006.01) E21D 11/14 (2006.01) E21D 11/15 (2006.01) E21D 11/20 (2006.01)

Patent

CA 1202792

ABSTRACT OF THE DISCLOSURE A mine arch construction consisting of first and second load-bearing frame members to which are secured a plurality of ribbed deck members so as to define an elongated open-ended enclosure. The frame members have outwardly projecting threaded stud members which pass through openings in the deck and cooperate with retainer members to secure the assembly. A unique form of sheet metal nut member may be employed to permit relative sliding securement of the nut member to the threaded stud, while resisting relative sliding removal thereof. Male and female lateral edges facilitate joinder of adjacent panel edges and may be provided with gasket materials so as to resist leakage of air through the joint. The assembly, which is adapted for disassembly and reuse may advantageously be employed as a mine overcast, as well as for other mine uses.

418909

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