Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1988-08-01
1990-02-27
Reese, Randolph A.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405259, 411 5, 411 8, E21D 2100
Patent
active
049041223
ABSTRACT:
An anchoring device, such as a rock anchor, includes an anchor rod with force transmission ribs projecting outwardly from its outside surface. An anchor nut is in threaded engagement with the rod and has at least an axially extending portion formed of a material having lesser strength than the material of the rod. The anchor nut has at least two axially extending portions spaced apart by cuts through the nut, which cuts extend transversely of the nuts central axis. The portions follow one another in the central axis direction with at least the portion closer to the body into which the anchor rod extends having the lesser strength. The nut portions are dimensioned so that the portion closer to the body loses its force locking engagement with the ribs on the rod and its threads shear off when a predetermined load is exceeded. The nut portions are interconnected by narrow webs remaining after the cuts are made in the nut separating the portions. The webs cannot transmit the anchor force when the predetermined load is exceeded, and, therefore, they act as breaking points with the two portions moving toward one another and closing off the cuts. The closure of the cuts is visible and signals that the predetermined load has been exceeded, accordingly, steps can be taken to secure the stability of the body into which the anchoring device is inserted.
REFERENCES:
patent: 1380395 (1921-06-01), Korach
patent: 2394812 (1946-02-01), Seitz
patent: 4410296 (1983-10-01), Unrug
patent: 4630971 (1986-12-01), Herbst et al.
Herbst Thomas
Schnitzler Lorenz
Dyckerhoff & Widmann Aktiengesellschaft
Olsen Arlen L.
Reese Randolph A.
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