Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1983-06-10
1984-12-25
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
405261, E21D 2000
Patent
active
044900740
ABSTRACT:
Broadly, the structures of the invention comprises a friction rock stabilizer and a sheath therefor to isolate the stabilizer from the surface of an earth structure bore and its associated corrosion environment, and bonding between the engaging surfaces of the stabilizer and sheath. The sheath, of low-friction polyethylene (although other suitable material could be used), facilitates stabilizer insertion into the bore. Additionally, the polyethylene sheath is heat and pressure sensitive. Insertion of the stabilizer generates considerable frictional heat and pressure and, as a consequence, upon the stabilizer being fully inserted, the sheath fuses onto the exterior, interfacing surface of the stabilizer. Further, the sheath material extrudes from prominences and flows into crevices (a) in the surface of the bore against which it is forceably pressed, and (b) plastically deforms to insinuate itself into, around, and onto discontinuities in the interfacing surface of the stabilizer, lockingly to engage with the latter surface. Such fusing, extrusion and flow, and the aforesaid locking engagement inhibit disengagement of the stabilizer from the sheath, and the sheath from the bore, following insertion of the stabilizer into a sheath-lined bore. The method of the invention comprises preparing one of the aforesaid engaging surfaces with adhesive, or grit, etc., to secure the stabilizer, in the bore, firmly bonded to the sheath.
REFERENCES:
patent: 1330906 (1920-02-01), Schoenfeld
patent: 2696137 (1954-12-01), Thomas et al.
patent: 3641772 (1972-02-01), Dietrich
patent: 3813985 (1974-06-01), Perkins
patent: 4022101 (1977-05-01), Helgesson
patent: 4051681 (1977-10-01), Yaros
patent: 4132080 (1979-01-01), Hansen
Corbin David H.
Ingersoll-Rand Company
Murphy B. J.
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