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US 4,063,426 AGranted
Three column tower
OwnerFrode Johan Hanseninventor
Life of this patent
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OwnerFrode Johan Hanseninventor
Estimating the term…
A marine structure comprising a plurality of hollow vertical columns tied permanently together by bracing elements at their lower and upper portions with cross bracing elements within their lengths to form a rigid tower, the columns having hollow feet open at their lower ends to be sunk into a sea bed, an excavating mechanism inside the feet for excavating sea bed material. Each column of the structure is floatable in water and is provided with inlet through which ballast may be introduced to sink it vertically in the water. A method of constructing a marine structure comprising making a plurality of hollow columns, bracing the columns together at their end portions and between their end portions to form a horizontally disposed rigid buoyant structure such that when erected on the sea bed no horizontal bracing members are in the critical wave zone, assembling hollow feet on the columns, floating the structure to the site with the columns substantially horizontal, ballasting one end portion of the columns to upend the structure into a substantially vertical position and to sink the structure onto the sea bed, and excavating the sea bed within the feet to enable the structure to be seated firmly in the upright position at a suitable foundation depth in the sea bed.
A method of constructing a marine structure comprising making three hollow columns, bracing the columns together adjacent their end portions with bracing members at right angles thereto and between their end portions with bracing members diagonally thereto to form a horizontally disposed rigid buoyant structure such that when erected on the sea bed said bracing members at right angles will be horizontal members beyond the critical wave zone with said diagonally extending bracing members situated between said end portions, assembling hollow feet on the columns, floating the structure to the site with the columns substantially horizontal, ballasting one end portion of the columns to upend the structure into a substantially vertical position and to sink the structure onto the sea bed, and excavating the sea bed within the feet to enable the structure to be seated firmly in the upright position at a suitable foundation depth in the sea bed.
A marine structure comprising three substantially vertical columns, braces within the lengths of said columns secured to said columns thereby forming a rigid tower, the braces adjacent lower and upper portions of said columns extending generally horizontally in the erected condition of said structure, said braces adjacent the lower portions of said columns also being adjacent to the sea bed in the erected structure and the braces adjacent to upper portions of said columns being disposed at the upper end of the structure above the highest eave crest possible at the site, the braces within the lengths of the columns between said horizontally extending braces extending substantially diagonally in the erected condition of said structure whereby there are no horizontally extending braces in the critical wave zone, a foot secured to the lower end of each column to be sunk into the sea bed, and means for excavating sea bed soil material within each foot.
Dependencies are inferred from the claim text.