Prefabricated metal overcast having a crushable lower section

Details Prefabricated metal overcast having a crushable lower section Prefabricated metal overcast having a crushable lower section

1999-01-26

2000-10-10

Lillis, Eileen D.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

405151, 405288, 405290, 454169, E02D 2900, E02D 302, E21D 900

Patent

active

061294837

ABSTRACT:
A ventilation overcast may comprise a plurality of support columns, each of which has an upper end and a lower end. A plurality of cross beams are connected between the upper ends of each of the plurality of support columns so that the support columns and cross beams define a generally rectangular structure having two opposed side wall portions and a roof portion. A curtain member having a plurality of longitudinal corrugations therein is positioned between the lower ends of adjacent support columns located on the same side wall portion of the ventilation overcast so that a bottom portion of the curtain member contacts the floor of the mine. The longitudinal corrugations allow the curtain member to be crushed when subjected to floor heave.

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