Hydraulic and earth engineering – Means to expose a normally wetted surface,e.g. – cofferdam – etc.
Patent
1983-07-25
1985-06-11
Taylor, Dennis L.
Hydraulic and earth engineering
Means to expose a normally wetted surface,e.g., cofferdam, etc.
405195, 405207, 114296, E02D 1904
Patent
active
045225320
ABSTRACT:
A bottom-seated portable cofferdam is disclosed along with a method of using the cofferdam for providing working access to underwater surfaces which are generally horizontal. The cofferdam includes a housing having a bottom opening with a skirt extending about its periphery, first and second seal means being secured to the skirt in spaced-apart relation to form a differential pressure chamber open along its bottom. In use, the cofferdam is first positioned adjacent the underwater surfaces, water then being evacuated from the chamber in order to develop a differential pressure therein for urging the cofferdam into engagement with the underwater surfaces. For applications where the underwater surfaces include vertical surface portions, the first and second seals are configured to generally mate with the vertical surface portions as well as the generally horizontal surfaces, evacuation of the differential pressure chamber serving to urge the cofferdam into engagement with the vertical surface portions as well as the generally horizontal surfaces.
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