Method for testing a prestressed concrete conduit

Details Method for testing a prestressed concrete conduit Method for testing a prestressed concrete conduit

1997-10-31

1999-12-07

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73598, 73600, G01N 2904, G01N 2918, G01N 2920

Patent

active

059964138

ABSTRACT:
A method is provided for testing prestressed concrete pipe. In the method, elastic waves are serially induced at at least three different inducing locations along the surface of the conduit. The shear wave component of each induced elastic wave is detected by at least one, and preferably two, acoustic sensors disposed at fixed sensing sites along the conduit. The relationship between at least one parameter of each induced shear wave and the distance between each inducing location and the acoustic sensor(s), are correlated and compared with standard correlations to identify structural discontinuities in the conduit. In a typical example of the method, elastic waves are induced using a mechanical hammer at multiple inducing sites around a multiplicity of annuli along the length of the conduit. Each annulus is separated from adjoining annuli by 2-4 feet.

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