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AssigneeMarine Structure Consultants (MSC) B.V.
InventorsCornelis J. Mommaas, Dirk Manschot
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A jack-up platform comprising a deck structure, a column with a base structure and a jack-up system for moving the column and the deck structure relative to each other. The base structure comprises a base and at least three base supporting parts, while the deck structure, starting from at least three spaced coupling places, can be connected by means of tensioning means with at lest three mutually spaced connecting places on or near the base supporting parts. Before the installation the platform, floating with pulled-up column, is brought to the desired location where the base supporting parts are brought into contact with the floor and the deck structure is raised out of contact with the water. After providing the tensioning means and bringing the deck structure to working height, the tensioning means are tensioned, for instanse by slightly further raising the deck structure which is then secured relative to the column.
A jack-up platform comprising a deck structure with floating power and a column with a base structure, in which a jack-up system acts on the column so as to be able to move and secure the deck structure and the column relative to each other, and the base structure comprises a base and at least three separate base supporting parts, characterized in that the deck structure, through tensioning means starting from at least three spaced coupling places, can be connected with at least three mutually spaced connecting places on or near the base supporting parts.
A jack-up platform according to any one of the preceding claims, characterized in that at least a plurality of the tensioning means extends as stay elements deviating from the vertical between the coupling places and the connecting places.
A jack-up platform according to any one of the preceding claims, characterized in that a connecting place is connected with a coupling place through one tensioning means.
A jack-up platform according to any one of the preceding claims, characterized in that a tensioning means has the form of an elongated element consisting of at least one pipe, rod, chain, cable or similar element.
A jack-up platform according to any one of the preceding claims, characterized in that at least the base or at least one of the base supporting parts comprises a body with floating power, such as a tank.
A jack-up platform according to any one of the preceding claims, characterized in that the base structure can be pulled up into a hole suitable for the purpose, provided in the deck structure.
A jack-up platform according to any one of the preceding claims, characterized in that the base structure is vertically of relatively flat design.
A jack-up platform according to any one of the preceding claims, characterized in that the deck structure is composed of a lower part and an upper part, which upper part recedes relative to the lower part over at least part of the circumference.
A jack-up platform according to any one of the preceding claims, characterized in that the deck structure consists of an edge body surrounding a central through hole, in which hole the jack-up system is centrally and locally installed.
A jack-up platform according to any one of the preceding claims, characterized in that at least one of the base supporting parts is provided with an apron-shaped extension which can penetrate into a sea floor.
A jack-up platform according to any one of the preceding claims, characterized in that means are provided to apply a filling material, such as grout, under a base supporting part.
A jack-up platform according to any one of the preceding claims, characterized in that means are provided to create a reduced pressure under a base supporting part.
A method for installing a jack-up platform according to any one of the preceding claims, in which the platform, floating in the water with a pulled-up column, is brought to the desired location where the column with its base supporting parts is brought into supporting contact with the floor under water, the deck structure is raised along the column so as to be out of contact with the water, and the support of the base supporting parts on the floor is completed while vertically aligning the column, characterized in that each connecting place on or near the base supporting parts is connected by a tensioning means with at least one coupling place on the deck structure, the tensioning means are tensioned after bringing the deck structure to working height, and the deck structure is secured relative to the column.
A method according to any one of the preceding claims, characterized in that the column is pulled up so far that the base structure is completely within a space provided in the deck structure for this purpose.
Dependencies are inferred from the claim text.