Automatic SPT monitor

Details Automatic SPT monitor Automatic SPT monitor

2008-07-29

2008-07-29

Neuder, William (Department: 3672)

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

C175S040000, C175S020000, C175S135000, C175S044000, C173S004000

Reexamination Certificate

active

11302048

ABSTRACT:
An apparatus is used with an impact hammer penetration assemble such as standard penetration test (SPT) in geotechnical engineering. The impact hammer penetration assembly comprises a penetration sample, a series of rods coupled together and an impact hammer apparatus. The drop of the hammer from a constant height hits the coupled rods and sampler in series and forces the sampler deeper into the ground. The apparatus includes a tip depth transducer and sampler to output a first electrical signal that is a function of the sampler tip position. A shock force transducer communicates the axial shock force in the rod to output a second electrical signal that is a function of the rod shock force and hammer blows. A shock penetration transducer communicates the movement of the coupled rods and sampler to output a third electrical signal that is a function of the sampler penetration due to the hammer blows. A micro-process controller monitors and processes the first, second and third signals in real time.

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American Society on Testing and Materials (ASTM), “Standard Test Method for Penetration Test and Split-Barrel Sampling of Soils,” 1995, 129-133, Designation: D-1586-84.
ASTM, “Standard Test Method for Stress Wave Energy Measurement for Dynamic Penetrometer Testing Systems,” Soil and Rock(I), 1995, 775-778, Designation: D4633-86.
Geotechnical Engineering Office, “Standard Penetration Tests,” Guide to Site Investigation, 1997, 111-113, Ch. 21.
Hong Kong Housing Authority, “Standard Penetration Tests,” General Specifications for Ground Investigation Contracts, 2003, 1-1—1-2.
Yue, Z.Q., et al., “Automatic Monitoring of Rotary-Percussive Drilling for Ground Characterization . . . ,” International Journal of Rock Mechanics & Mining Science, 2004, 573-612.

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