Static penetrometer

Details Static penetrometer Static penetrometer

1981-01-19

1983-01-11

Goldstein, Herbert

Measuring and testing

Hardness

By penetrator or indentor

G01N 342

Patent

active

043676472

ABSTRACT:
A drill string is provided at its lower end with a downwardly directed point having an upright cylindrical outer surface and a bore opening at this surface. A rod is provided in the bore and has a rod end horizontally displaceable therein between an inner position generally flush with the surface and an outer position spaced horizontally outwardly from the surface. In the inner position the point can be driven or drilled down into the ground. A fluid cylinder in the point has a piston connected to the rod that can be pressurized to urge the rod from the inner to the outer position. Thus the position of the rod end relative to the surface can be detected and the pressure exerted horizontally back against the rod end when it is urged outwardly by the pressurizing means can also be determined to establish the penetration resistance of the ground surrounding the point.

REFERENCES:
patent: 3872717 (1975-03-01), Fox
patent: 3906781 (1975-09-01), Vlasblom
patent: 3961524 (1976-06-01), de la Cruz
patent: 4043186 (1977-08-01), Marchetti

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