A method of elevating the deck area of a marine platform (e.g., oil and gas well drilling or production platform) utilizes a specially configured sleeve support to support the platform legs so that they can be cut. Once cut, rams or jacks elevate the platform above the cuts. The sleeve support is then connected (e.g., welded) to the platform leg and becomes part of the structural support for the platform. In one embodiment, two sleeves are employed. In another embodiment, the jacks or rams elevate in two stages including a first stage wherein one sleeve elevates and the other sleeve does not elevate and a second stage wherein both sleeves elevate together.

A offshore structure (10) comprising a tube (12) having a longitudinal axis (32) and comprising an open-ended lower end (22) whose peripheral edge (24) is adapted to cut into the sea bed (14) as the offshore structure (10) is driven into it, the offshore structure (10) comprising: a plurality of stabilisers (18) each comprising a main body portion forming a hollow interior volume (23) and having an open lower end (22) whose peripheral edge (24) is adapted, in use, to cut into the sea bed (14), whereby in use, a trapped volume of fluids is retained in the hollow interior volume between the main body portion and the sea bed (14), each stabiliser (18) further comprising an outlet (34) communicating with its respective hollow interior volume (23) and a control means (36) to control, in use, the egress of the trapped volume of fluids from the hollow interior volume (23) of each respective stabiliser (18), and wherein the geometric centres of the hollow interior volumes (23) of the stabilisers (18) are radially offset (44) from the longitudinal axis (32) of the offshore structure (10).

In an assembly of an offshore support structure for a wind turbine, tubular members are interconnected in grouted connections where a first tubular member has fastened to it a shell-unit comprising a cavity into which an end-part of a second tubular member is inserted and fixed by grouting. The cavity is closed by a rigid entrance-flange that is fastened to the walls of the shell-unit. The design converts forces acting on the second tubular member to compression forces acting on the grout in the cavity.

An offshore platform for a marine environment includes a regulating tower section supporting at least one offshore wind turbine, at least one buoyancy tube connected between the regulating tower section, the at least one buoyancy tube having a tapered lower end extending to a seabed, and a concrete bed within the seabed. The tapered lower end is a cone-shaped bottom slab having a flat top surface with an apex of the cone-shaped bottom slab pointing downward towards the seabed. The concrete bed includes a reversed cone-shaped indentation to which the cone-shaped bottom slab is to be fixed within that was formed in the concrete bed by the cone-shaped bottom slab prior to the concrete bed hardening to a final design strength.

The present disclosure describes a base structural building module employing a core structural member having an array of upwardly and outwardly and downwardly and outwardly extending braces or arms extending therefrom. Tubular cans are mounted at the ends of each of the upper and lower arms to receive piles. One upper arm is aligned and paired with one lower arm and the pair's respective cans are aligned about their can axis. The modules employ flexible design by varying the lengths of the arms and their respective inclination or declination angles. Modules can be stacked one on top of another (and secured) to form multi-tiered structural building jackets for building vertical structures such as, for example, oil and gas platforms used onshore or offshore as well as other structures. Each tier can also comprise multiple modules joined laterally together to provide a wide variety of potential template configurations and building applications.

An adjustable platform for installing a wind turbine generator comprises an adjustable platform shell, the adjustable platform shell is installed on a hull, pile legs are connected vertically in the adjustable platform shell in a sliding way, a plurality of adjusting jacks are arranged on the pile legs, an electric plug-in component is arranged in the adjustable platform shell and used for fitting with the adjusting jacks. The fitting of electric plug-in component with the adjusting jacks of the pile legs replaces the bolted connection between the installation platform and the pile legs, and the electric power is used to replace the manual operation, solving the technical problems in the prior art that bolted connection is required between the installation platform and the pile legs, bolts are required to be removed manually before the pile legs sink, and the labor cost is greatly consumed.

A jacket leveling tool may comprise a substantially cylindrical central body and a plurality of hydraulic cylinders disposed about the body. Disposed about an exterior surface of the central body may be a radial skirt and radial collar, each of which may also be attached to one end of the plurality of hydraulic cylinders. A cap may be attached to an upper end of the central body, with first and second links configured to attach to connection points on an outer surface of a jacket, such that the relative vertical position of the jacket may be adjusted through the injection of hydraulic fluid into the hydraulic cylinders.