Method for dry isolation of a water passage of a dam

Details Method for dry isolation of a water passage of a dam Method for dry isolation of a water passage of a dam

2007-05-07

2011-11-29

Safavi, Michael (Department: 3637)

Hydraulic and earth engineering

Means to expose a normally wetted surface,e.g., cofferdam, etc.

Having transport, placement, or dislodgement means

C405S111000, C405S114000

Reexamination Certificate

active

08066449

ABSTRACT:
A needle-beam cofferdam, needles and associated method for dry isolation of a water passage of a dam, the method comprising providing a support beam which spans between piers of the water passage, providing at least one hollow metal needle having a major axis, and positioning the hollow needle with the major axis substantially vertically oriented, the hollow needle engaging with a sill of the dam and engaging with the support beam. A plurality of vertically positioned needles may thereby isolate the water passage. The method also includes positioning of hollow needles with the major axis in a substantially horizontal orientation.

REFERENCES:
patent: 4484836 (1984-11-01), Bailard
patent: 4582296 (1986-04-01), Bachmann
patent: 5634742 (1997-06-01), Mills

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