A method includes mounting a first jacket connector block (400) to an apparatus. The first jacket connector block includes a first frame (415), a plurality of first conductor tubes (405) connected to the first frame, a first plurality of releasable connectors (420) coupled to first ends of the first conductor tubes, and a second plurality of releasable connectors (420) coupled to second ends of the first conductor tubes and engaging the apparatus.

A method of installing foundation elements, in particular (mono)piles having a diameter of five meters or more, in an underwater ground formation includes lowering a leader from a surface vessel with at least the tip of the leader into the water, and lowering a foundation element and/or a noise mitigation screen along the leader.

A method of installing foundation elements, in particular (mono)piles having a diameter of five meters or more, in an underwater ground formation includes lowering a leader from a surface vessel with at least the tip of the leader into the water, and lowering a foundation element and/or a noise mitigation screen along the leader.

Disclosed is a method of constructing an underwater concrete block structure, including: fabricating a plurality of concrete blocks having a vertical hole extending in the vertical direction; forming a foundation concrete block structure by installing the concrete block on the seafloor; vertically installing at least one guide pole in the foundation concrete block structure; forming a concrete block stack by repeating a process of positioning the concrete block to be installed above the surface of the water; and forming a main concrete column for binding the plurality of concrete blocks.

Disclosed is a method of constructing an underwater concrete block structure, including: fabricating a plurality of concrete blocks having a vertical hole extending in the vertical direction; forming a foundation concrete block structure by installing the concrete block on the seafloor; vertically installing at least one guide pole in the foundation concrete block structure; forming a concrete block stack by repeating a process of positioning the concrete block to be installed above the surface of the water; and forming a main concrete column for binding the plurality of concrete blocks.

A method for the offshore installation of a construction laid by gravity on the seabed, comprising: the provision of a concrete base (1) delimited by a lower slab (8), a roof (2) and a perimeter wall (5), the interior whereof comprises vertical walls (6, 6′) forming cells (7, 12, 22); connecting at the periphery of the roof (2) a plurality of hollow metal floats (3) formed by a column with a circular or polygonal base; towing the assembly to the offshore location where the construction is to operate; allowing seawater to enter the cells (12) located below the roof (2), maintaining the cells (22) located below the metal floats (3) empty, in such a way that when the cells (12) located below the roof (2) are totally full, both the base and the metal floats (3) are submerged; once the cells located below the roof (2), but not those located below the metal floats (3) are full of water, allowing water to enter the cells (22) located below the metal floats (3) in such a way that the immersion of the assembly is completed, the base thereof resting on the seabed; and removing the metal floats. A gravity-based structure comprising a concrete base (1) and a plurality of hollow metal floats (3) connectable thereto.

A method for the offshore installation of a construction laid by gravity on the seabed, comprising: the provision of a concrete base (1) delimited by a lower slab (8), a roof (2) and a perimeter wall (5), the interior whereof comprises vertical walls (6, 6′) forming cells (7, 12, 22); connecting at the periphery of the roof (2) a plurality of hollow metal floats (3) formed by a column with a circular or polygonal base; towing the assembly to the offshore location where the construction is to operate; allowing seawater to enter the cells (12) located below the roof (2), maintaining the cells (22) located below the metal floats (3) empty, in such a way that when the cells (12) located below the roof (2) are totally full, both the base and the metal floats (3) are submerged; once the cells located below the roof (2), but not those located below the metal floats (3) are full of water, allowing water to enter the cells (22) located below the metal floats (3) in such a way that the immersion of the assembly is completed, the base thereof resting on the seabed; and removing the metal floats. A gravity-based structure comprising a concrete base (1) and a plurality of hollow metal floats (3) connectable thereto.

A modular noise-insulating device for offshore pile driving, comprising interconnected noise-insulating modules movably nested in a telescopic arrangement in a storage position and constructed to move telescopically relative to each other, wherein the noise-insulating modules are substantially homogeneous or comprise a noise-insulating portion providing a buoyant force and a ballast portion providing a gravitational force, wherein in a surrounding liquid in the operating position, each noise-insulating module arranged above the bottom module provides a ratio of a total buoyant force versus a total gravitational force provided by said noise-insulating module, said ratio being in a first range of ratio between 1 and 5, the bottom module provides a second ratio of a total buoyant force of said bottom module versus a total gravitational force of said bottom module, said second ratio being below a maximum ratio of said noise-insulating modules.

A method for protecting a novel anti-drop submarine cable includes: assembling a traction assembly, a standard bending protection section and a protection reinforcement section sequentially to form a submarine-cable-protection device, and a submarine cable passing through it; connecting a traction rope of the traction assembly to a reserved traction rope pre-buried in a single pile foundation, and enabling the submarine cable and the submarine-cable-protection device by a traction device passing through a reserved hole of the foundation; moving the assembled sets forward until the traction rope is lifted and unmovable, enabling a retaining ring of the protection reinforcement section to abut against the reserved hole, installing the traction rope on the foundation by shackles; pulling the reserved traction rope to a proper length, fixing the submarine cable to installation base. The safety is ensured by avoiding dropping of the submarine-cable-protection device, and ensures the overbending protection of the submarine cable.

An off-shore wind turbine system is assembled using a platform or jack-up vessel, and a first base anchored to the seafloor at a bade assembly off-shore location. A buoyant tower is attached to the first base. A crane provided on the platform or jack-up vessel is used to lift blades and blades, which are then coupled to a turbine held in a nacelle provided at the top of the buoyant tower. The buoyant tower, the nacelle, and the blades are detached from the first base. The buoyant tower, the nacelle, and the blades are towed to a wind farm and connected to a second base provided in the wind farm. The buoyant tower, the nacelle, and the blades are further stabilized using mooring lines spanning between the buoyant towers and other bases provided in the wind farm. The first base and/or the second base include anti-rotation features.