Three-dimensional helicoidal post-tensioning and reinforcement strategy for concrete anchor applications

A concrete suction anchor including a cylindrical structure that has a lateral cylindrical wall and a longitudinal axis, wherein the cylindrical structure is open at a bottom end and closed at a top end, wherein the cylindrical structure defines a main cavity open at the bottom end, wherein said lateral cylindrical wall of the cylindrical structure includes a plurality of internal channels housing at least one pair of sets of post-tensioning tendons, wherein a first set of post-tensioning tendons is inclined with respect to said longitudinal axis by a first angle opposite to a second angle according to which a second set of post-tensioning tendons is inclined with respect to said longitudinal axis, wherein each of said first and second angles has an absolute value larger than 0° and lower than 90°;

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• wherein said top end of the cylindrical structure is closed by a top dome defining a top internal buoyancy chamber, wherein the cylindrical structure has an intermediate internal buoyancy chamber that is interposed between the top internal buoyancy chamber and the main cavity, wherein a top internal vent puts the top internal buoyancy chamber in fluid communication with the intermediate internal buoyancy chamber and a bottom internal vent puts the main cavity in fluid communication with the intermediate internal buoyancy chamber.

A concrete suction anchor including a cylindrical structure that has a lateral cylindrical wall and a longitudinal axis, wherein the cylindrical structure is open at a bottom end and closed at a top end, wherein the cylindrical structure defines a main cavity open at the bottom end, wherein said lateral cylindrical wall of the cylindrical structure includes a plurality of internal channels housing at least one pair of sets of post-tensioning tendons, wherein a first set of post-tensioning tendons is inclined with respect to said longitudinal axis by a first angle opposite to a second angle according to which a second set of post-tensioning tendons is inclined with respect to said longitudinal axis, wherein each of said first and second angles has an absolute value larger than 0° and lower than 90°;

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• wherein said top end of the cylindrical structure is closed by a top dome defining a top internal buoyancy chamber separated from the main cavity, wherein an internal vent puts the main cavity in fluid communication with the top internal buoyancy chamber.