Peripherally flexible prop arch for mining tracks, tunnels or th

Details Peripherally flexible prop arch for mining tracks, tunnels or th Peripherally flexible prop arch for mining tracks, tunnels or th

1984-06-04

1986-12-23

Husar, Cornelius J.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

E21D 1118

Patent

active

046309730

ABSTRACT:
A peripherally flexible arch for propping rock structure for mining tracks, tunnels or the like is comprised of a plurality of partially overlapped elongated segments, each of which has an end portion extended toward the rock structure, a bottom portion opposite to the end portion, and a lateral flange offset from the end portion laterally and in the direction toward the bottom portion. Clamping devices are arranged at the ends of the overlapping regions of the segments to clamp the segments to each other. The end portion of each lower segment is inserted into a groove formed between the end portion and the flange portion of each upper segment at the side of this segment facing away from the rock structure. Each clamping device has a hook engaged in a groove formed between the end portion and the flange of the upper segment at the side of this segment facing toward the rock structure.

REFERENCES:
patent: 2713774 (1955-07-01), Heintzmann et al.
patent: 2793719 (1957-05-01), Langerbein
patent: 3076672 (1963-02-01), Heintzmann et al.

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