Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1985-11-14
1987-04-28
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405261, 411452, 411516, E21D 2002
Patent
active
046610227
ABSTRACT:
Rock bolt structure and installation wherein the bolt takes the form of an elongate member having an enlarged head and also an elongate, blade-like shank. The opposite edges at the remote tip of the shank are slightly tapered, this to provide ease of installation in a rock formation hole or aperture. The width of the shank is designed so as to be slightly larger than the diameter of the hole. Thus, when the bolt is driven into the hole, there will be a friction fit and hence a frictional retention of the bolt at its edges by the hole wall. A bearing plate will be provided, the same having a slotted aperture to accommodate the blade-like shank of the bolt. Additionally, a relief aperture will be provided in the bearing plate to accommodate insertion of a grout fitting. The latter is supplied an impact tool, the same also having a relief aperture accommodating the head of the bolt. The opposite sides of the bolt shank are preferably roughened, i.e., serrated or dimpled, so as to increase the retention of the bolt in the hole through the employment of a grouted installation, the latter being accommodated by the impact tool of the invention.
REFERENCES:
patent: 412981 (1889-10-01), Sanford
patent: 778858 (1905-01-01), Higgins
patent: 2014746 (1935-09-01), Robergel
patent: 2299754 (1942-10-01), Johnson
patent: 3391543 (1968-07-01), Sweeney et al.
patent: 3415066 (1968-12-01), Williams
patent: 3643542 (1972-02-01), Elders
patent: 4185438 (1980-01-01), Fischer
patent: 4325657 (1982-04-01), Elders
patent: 4334804 (1982-06-01), Lindeboom
Shaffer M. Ralph
Taylor Dennis L.
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