Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1991-03-22
1993-06-01
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
2483541, 403374, 405288, E21D 1522
Patent
active
052154114
ABSTRACT:
A yieldable mine post system having a yieldable mine post construction, made of metal and in telescoping form. The post of the invention comprises a pair of mutually telescoping metal post lengths. The innermost tubular post length has a medial bubble portion of enlarged girth which is oversize relative to the nominal inside diameter of the outermost tubular post length. The result, consequently, is not only to increase the frictional resistance between the post lengths but also to create a bubble zone characterized by elastic/plastic mutually inter-cooperating radial deformation and elastic stress-loading of the telescoping post construction, for further progressively increasing resistance of the composite post structure to compression end loading of such post. The yieldable mine post construction can be made adjustable and also radially preloaded and preset for immediate, desired load resistance. A mine vehicle can also be provided, not only for transporting the yieldable mine posts to a mine site, but also be operative to lift and erect in vertical or other positions such mine posts. The vehicle may have hydraulic or other means for axially rotating and thereby tightening the posts in position.
REFERENCES:
patent: 2036490 (1936-04-01), Neilson et al.
patent: 2532168 (1950-11-01), Jakoubek
patent: 4382721 (1983-05-01), King
patent: 5015125 (1991-05-01), Seegmiller
Corbin David H.
Shaffer M. Ralph
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