Measuring and testing – Hardness – By penetrator or indentor
Patent
1985-03-29
1986-09-30
Levy, Stewart J.
Measuring and testing
Hardness
By penetrator or indentor
73784, G01N 324
Patent
active
046141103
ABSTRACT:
A device which separately measures the skin friction and the load-bearing capacity of the earth at the bottom of a hole. An expansion device is in the bottom of the hole, with a shaft resting on top it. A pressurized fluid is pumped into the expansion device, via a coaxial pipe and rod, to fill and expand it. By observing the movements of the rod and pipe responsive to the expansion and relative to the ground surface, it is possible to record the pressure versus upward movement of the shaft and the pressure versus downward movement of the earth below the bottom of the shaft. The ultimate or maximum skin friction is indicated when the load-upward movement curve plotted from the data indicates no further increase in load with upward movement. The ultimate end bearing capacity is indicated when the load-downward movement curve indicates no further increase in load with downward movement. When the shaft has concrete poured down the hole, the expansion device may be a bellows-like affair with the rod connected to the bottom of the bellows and the pipe connected to the top. When the shaft is a driven pile, the expansion device is a massive piston which can withstand the driving forces.
REFERENCES:
patent: 3503254 (1970-03-01), Menard
patent: 3633408 (1972-01-01), Johnston, Jr.
patent: 4315429 (1982-02-01), Morozov et al.
Bernat Louis
Levy Stewart J.
Roskos Joseph W.
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