Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1984-03-14
1986-05-06
Ruehl, Charles A.
Measuring and testing
Testing by impact or shock
Specimen impactor detail
73 84, G01N 334
Patent
active
045863660
ABSTRACT:
A method and apparatus for measuring the driving resistance and velocity of piles during driving utilizing a strain gage accelerometer mounted on the pile. The accelerometer is constructed of a material having high internal dampening characteristics and is excited by alternating current electric signals. The acceleration signals of the accelerometer are electronically integrated to provide a measurement of velocity and an accurate blow count, which may be simultaneously recorded on two separate recording media. The velocity measurements are integrated a second time to derive a measure of pile displacement for selected hammer blows, which in turn enables the driving resistance to be determined. Observation of the velocity measurement during pile driving operations permits anomalous data to be eliminated prior to the calculation of driving resistance.
REFERENCES:
patent: 3535919 (1970-10-01), Budlong et al.
patent: 3946598 (1976-03-01), Towne et al.
patent: 4347743 (1982-09-01), Rausche et al.
L. M. Moskalik, "Tensometric Accelerometers--With Overload Protection" Meas. Tech. (U.S.A.), vol. 22, No. 12, May 1980, pp. 1469-1471.
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