Automatic SPT monitor

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight

Reexamination Certificate

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Details

C175S040000, C175S020000, C175S135000, C175S044000, C173S004000

Reexamination Certificate

active

07404455

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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patent: 6286613 (2001-09-01), Tsai et al.
patent: 6637523 (2003-10-01), Lee et al.
patent: 6966950 (2005-11-01), Winiewicz et al.
patent: 2002/0043404 (2002-04-01), Trueman et al.
patent: 2005/0194134 (2005-09-01), McGregor et al.
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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