Welded grid primarily for supporting underground cavities...

Details Welded grid primarily for supporting underground cavities... Welded grid primarily for supporting underground cavities...

E - Fixed Constructions

02

D

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E02D 3/00 (2006.01) B21F 27/12 (2006.01) B21F 27/20 (2006.01) E04C 5/06 (2006.01) E21D 9/00 (2006.01) E21D 11/10 (2006.01) E21D 11/15 (2006.01) E21D 11/40 (2006.01)

Patent

CA 1091458

Abstract of the Disclosure A welded grid structure is disclosed for supporting underground cavities such as mine roads. It consists of two sets of mutually parallel straight bars disposed in parallel planes and connected together by welding to a third set of bars extending generally perpendicularly to the first two sets of bars. The bars of the third set have been bent to enable then to intersect the planes of the first and second sets but not all intersection points are welded. The non-welled intersection points are in accordance with a predetermined programme as a result of which the system is rigid in the principal direction along the straight bars of the first two sets and is flexible along a direction perpendicular thereto.

303528

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