Hydraulic and earth engineering – Means to expose a normally wetted surface,e.g. – cofferdam – etc. – Contoured to wetted surface – e.g. – side hung ship caisson
Patent
1985-04-11
1986-12-02
Taylor, Dennis L.
Hydraulic and earth engineering
Means to expose a normally wetted surface,e.g., cofferdam, etc.
Contoured to wetted surface, e.g., side hung ship caisson
114221R, 114227, 405192, 405188, B63C 1152
Patent
active
046261281
ABSTRACT:
A method of providing a habitable dry work chamber for conducting work on an underwater work surface when the nature of the work is such that dangerous fumes and gases are produced. An underwater gas pocket work unit is attached to the underwater work surface to define a work chamber that may be entered from beneath through the water. The work unit includes a structure consisting of walls defining a work opening, which, when positioned with the work opening at the work surface, defines a work chamber that is accessible only from beneath. The structure is sealed at the work opening to the work surface to define the work chamber, wherein the work chamber is defined solely by the structure and the work surface. A habitable gas that is heavier than the dangerous fumes and gases is caused to flow continuously into the work chamber through a valve in the structure to provide a gaseous pocket in the upper portion of the work chamber when the structure is sealed to the underwater work surface. Gases, including the dangerous fumes and gases, are exhausted from the work chamber through a port located at the uppermost portion of the work chamber and discharged into the water at a predetermined level that defines the water level within the chamber. The disclosed embodiment of the underwater gas pocket work unit is useful for defining an underwater gaseous work chamber adjacent a vertically inclined underwater work surface. A floatation chamber located on the side of the work unit that is opposite the work opening provides buoyancy for forcing the structure against an upwardly and outwardly extending vertically inclined work surface.
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Callan Edward W.
Taylor Dennis L.
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