Pile load testing device

Details Pile load testing device Pile load testing device

1991-03-13

1992-12-22

Noland, Tom

Measuring and testing

Hardness

By penetrator or indentor

73784, G01N 3324, G01N 308, G01N 342

Patent

active

051725878

ABSTRACT:
A device for testing the loading of a test pile extending downwardly into the ground. The device includes a reaction pile axially disposed inside the test pile and a reference pile axially disposed inside the reaction pile. The reaction pile extends further into the ground than the test pile and the reference pile extends further into the ground than the reaction pile. A loading device simultaneously exerts a downward force on the test pile and an upward reaction force on the reaction pile such that the test pile moves downwardly, and a laser distance measurement system, attached to the test pile and extending axially therewith, also moves downwardly. The laser distance measurement system resides in a test chamber defined by a shroud circumscribing the test device and secured to the top of the test pile so as to move downwardly therewith. Included in the distance measurement system is a first mirror disposed at the top of the reference pile, and a second mirror attached to the inside, top surface of the shroud. The two mirrors and laser system measure the rate of movement of the test pile with respect to the reference pile and the reaction pile with respect to the reference pile. The absolute rate of movement of the test pile is calculated by determining the difference between the rate of movement of reaction pile and the reference pile, and the rate of movement of the test pile and the reference pile.

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patent: 4614110 (1986-09-01), Osterberg
patent: 4770030 (1988-09-01), Smith
patent: 4845990 (1989-07-01), Bermingham

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