Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1990-05-14
1991-06-25
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405259, E21D 2100
Patent
active
050262173
ABSTRACT:
A mine roof support truss and components thereof including support brackets and accommodating stirrups. In the truss construction, a pair of new type mine roof support brackets are utilized in combination with respective stirrups, the latter including interconnecting tie rod structure. The support brackets are unitary and preferably cast in construction, the same including the first portion having an upper bearing surface and a horn portion integral with and depending from such first portion. The horn portion is provided with a lower, upturned J-shaped lip which is useful for retaining a respective stirrup, which is designed to hang, when inactive, from the horn portion at the lip. During installation procedures, the stirrup associated with each horn portion of the respective brackets is elevated to horizontal position and the two stirrups tied together by tie rod means, with or without additional structure. The support brackets are secured in place against the exposed surface of a mine roof by means of anchor bolts, which are anchored into predrilled holes in the mine roof strata. The outer or rearward surfaces of the horn portion of the brackets are contoured to accommodate the U-configured end portions of the stirrups utilized.
REFERENCES:
patent: 4596496 (1986-06-01), Tyrell et al.
patent: 4679967 (1987-07-01), Hipkins et al.
patent: 4749310 (1988-06-01), White
patent: 4934873 (1990-06-01), Calandra
Corbin David H.
Shaffer M. Ralph
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