Geometrical instruments – Distance measuring – Sounding type
Patent
1994-03-09
1996-01-02
Wirthlin, Alvin
Geometrical instruments
Distance measuring
Sounding type
33720, 33721, 33DIG1, 73290R, G01B 518, E21B 4704
Patent
active
054797241
ABSTRACT:
A method and apparatus for measuring scour depth in a waterway bed is described. The apparatus utilizes magnetic attraction between a weight resting on the waterway bed and a magnetic probe within a guide chamber to which the weight is attached. Magnetic attraction between the probe and the weight retains the probe in an aligned position with the weight, enabling a user to detect a reduced force in the support line to identify the location of the weight and thus the riverbed. In a second embodiment, the inventive device includes a second weight slidably attached to the guide enabling a measurement of infill in a waterway bed scour. In the method according to the invention, the weight is placed upon the waterway bed and allowed to rest there. A probe is then inserted into the chamber and allowed to descend to the level of the weight where magnetic attraction supports the probe. The location is identifiable by a reduced tension in the support line, and the depth can be determined by measuring the length of the support line from the waterway surface to the probe.
REFERENCES:
patent: 2550004 (1951-04-01), Doll
patent: 4006637 (1977-02-01), Kinosita
patent: 4855966 (1989-08-01), Cinquino
James Sherrill and Sean Kelly "Using Scour and Stream Instability Evaluations to Increase Bridge Safety," Public Works Jun.:56-57, 1992.
Thomas J. Fenner "Scoping Out Scour," Civil Engineering Mar.:75-77, 1993.
H. N. C. Breusers and A. J. Raudkivi, Scouring, A. A. Balkema, Rotterdam, The Netherlands, 1991, pp. 94-97.
Nahajski Anthony P.
Nahajski Stuart E.
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