US 4,367,647 AGranted

Static penetrometer

OwnerFrancois Barnoud, Jean-Bernard Labaysinventors

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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.

Claims9

Dependent claims

A static penetrometer usable in combination with a drill string, said penetrometer comprising:

a downwardly directed point fixed at the lower end of said string and having a substantially conical lower portion and a substantially cylindrical upper portion, said upper portion having an upright outer surface and a bore opening horizontally at said surface;
a horizontal rod in said bore of said point having a rod end horizontally displaceable in one direction between an outer position spaced horizontally outward from said surface and an inner position generally flush with said surface, whereby said string with said point can be driven or drilled down into the ground with said rod in said inner position to form a hole in which said point fits snugly;
a fluid cylinder in said point connected to said rod;
means for pressurizing said cylinder and urging said rod from said inner to said outer position and thereby pressing said upper portion oppositely to said direction against the side of said hole opposite said rod end;
and
means connected to said rod and cylinder for indicating the position of said rod end relative to said surface and the pressure exerted horizontally back against said rod end when same is being urged outward by the pressurizing means.

3 more elements

A static penetrometer usable in combination with a drill string, said penetrometer comprising:

a downwardly directed point at the lower end of said string and having an upright outer surface and a bore opening horizontally at said surface;
a rod in said bore of said point having a rod end horizontally displaceable between an outer position spaced horizontally outward from said surface and an inner position generally flush with said surface, whereby said point can be driven or drilled down into the ground with said rod in said inner position;
a fluid cylinder in said point connected to said rod and including a cylinder sleeve and a piston defining two compartments therein, said piston being connected to said rod;
means for pressurizing said cylinder and thereby urging said rod from said inner to said outer position, the pressurizing means including a body of hydraulic liquid filling one of said compartments, the other compartment being between said piston and said rod end;
and
means connected to said rod and cylinder for indicating the position of said rod end relative to said surface and the pressure exerted horizontally back against said rod end when same is being urged outward by the pressurizing means, the indicating means including means for measuring the volume and pressure of said liquid in said one compartment.

3 more elements

Dependencies are inferred from the claim text.