Method for investigating an anchored rod-like body having an acc

Details Method for investigating an anchored rod-like body having an acc Method for investigating an anchored rod-like body having an acc

1979-04-11

1982-01-05

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73628, 73778, G01N 2904

Patent

active

043087515

ABSTRACT:
A method and apparatus for investigating a rod-like body which is anchored in a surrounding material and which has an accessible end, for determining the state of the anchorage of the body and its length. Transient elastic oscillations are excitated in the accessible end of the body. The oscillations comprise a flexural wave causing a deformation of the body varying with respect to amplitude and phase over the cross-section of the body. The flexural wave propagates in the longitudinal direction of the body and is partially reflected at discontinuities of the body and/or the anchorage. Transient elastic ocillations comprising flexural waves reflected at such discontinuities and returning to the accessible end of the body are received and detected. The position and magnitude and/or type of at least some of the discontinuities are estimated with the aid of time-position and amplitude of the reflected flexural waves. Discontinuities of interest are the beginning and end of anchorage, the end of the body and possible cracks or fractures in the body and/or its anchorage.
The method and the apparatus are primarily intended for in-situ investigation of concrete-bond rock anchors (bolts), although the method and apparatus can be used for at least partially investigating other anchored rod-like bodies.

REFERENCES:
patent: 2625035 (1953-01-01), Firestone
patent: 3306100 (1967-02-01), Wilhelm et al.
patent: 3810385 (1974-05-01), McFaul et al.
patent: 4062227 (1977-12-01), Heyman
patent: 4191904 (1980-03-01), Massa
patent: 4198865 (1980-04-01), Tarpley et al.

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