Offshore installation

Abstract

The invention relates to an offshore installation, comprising an underwater foundation structure, a construction placed onto the foundation structure, a docking device for a boat, and a device for cathodic corrosion protection for the underwater foundation structure, said device having at least two anodes (2), which are arranged at a distance from each other and are each fastened to a beam (4) or a support of the foundation structure, the extension arms or the supports being connected directly to the foundation structure below the waterline.

Claims

1. An offshore installation comprising an underwater foundation structure, a construction placed on the foundation structure and a landing facility for a boat and a device for cathodic corrosion protection for the underwater foundation structure, having at least two anodes (2) arranged at a distance from one another, which are each fastened to one of a plurality of a beams (4) or brackets of the foundation structure, wherein the offshore installation is characterized in that the beams or the bracket are each connected directly to the foundation structure below a waterline; the underwater foundation structure is formed as a monopile foundation and the beams (4) or the bracket are fastened directly to an outer wall of a monopile (1); and with reference to a circumference of the monopile (1), the at least two anodes (2) extend at an angular distance from one another of greater than or equal to 90°; and the beams are formed as hollow profiles through which a power cable is laid, the power cable being connected to the anode and being guided through an opening in the outer wall of the monopile.

2. The offshore installation of claim 1, wherein with reference to the circumference of the monopile (1), the at least two anodes (2) extend at diametrically opposed points of the monopile (1).

3. The offshore installation of claim 1, wherein the beams (4) or the bracket are each supported against the monopile (1) by a supporting construction.

4. The offshore installation as claimed of claim 3, wherein the supporting construction comprises diagonal supporting struts (6, 7), which each extends between the outer wall (3) of the monopile (1) and the beams (4) or the bracket.

5. The offshore installation of claim 1, wherein the anodes (2) are each formed as rods or tubes which extend approximately parallel to a longitudinal axis of the foundation structure.

6. The offshore installation of claim 1, wherein the anodes (2) are each formed as a disc.

7. The offshore installation of claim 1, wherein an external current is applied to each of the anodes (2).

8. The offshore installation of claim 1, wherein the beams or the bracket are welded, screwed or riveted to the outer wall of the monopile.

9. A method for erecting an offshore installation having the features of claim 1, in which a monopile (1) as an underwater foundation structure is firstly pre-equipped with at least two beams (4) and anodes (4) fastened thereto, the monopile (1) with the anodes (2) fastened thereto is then driven into a subsoil of a seabed and the construction to be erected is subsequently assembled and completed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained below with the aid of an exemplary embodiment illustrated in the drawings, which show:

(2) FIG. 1 a schematic view of part of the underwater foundation structure according to the invention and

(3) FIG. 2 a plan view of the foundation structure according to FIG. 1.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(4) The offshore installation according to the invention comprises an underwater foundation structure in the form of a monopile 1, which has been driven into the subsoil of the seabed by vibratory piling, piling or vibration. The monopile 1 is formed, for example, as a cylindrical steel tube with a diameter of ca. 7 m, which can have been driven up to 30 m, for example, into the subsoil of the seabed. The monopile 1 comprises a flange (not illustrated) on which a transition piece is placed. The transition piece in turn receives a construction, for example a platform for a transformer facility or for a production or exploration facility or a tower for a wind turbine.

(5) The offshore installation according to the invention can furthermore comprise a boat landing facility, which, for example as a steel tube construction, can be fastened both to the transition piece and to the monopile 1.

(6) The offshore installation furthermore comprises a device for cathodic corrosion protection, which is operated by an external current (ICCP). In the exemplary embodiment described, the corrosion protection device comprises two anodes 2, which are fastened at diametrically opposed points of the monopile 1 to the outer wall 3 thereof. The anodes 2 are each formed as tubular elements, which are fastened to beams 4 on the monopile 1. The anodes extend approximately parallel to the longitudinal axis of the monopile 1. They can also extend at an angle to the longitudinal axis of the monopile 1. As already described above, the anodes can also be formed in a disc shape. It is essentially possible for more than 2 anodes to be arranged distributed over the circumference of the monopile 1.

(7) The beams 4 are formed as steel girders, which are welded to the outer wall 3 of the monopile 1.

(8) The beams 4 are formed as hollow profiles through which a power cable 5 is laid. The power cable 5 is connected to the anode 2 and is guided through an opening 8 in the outer wall 3 of the monopile 1 to a voltage source (not illustrated). The beam 4 is connected in a sealed manner to the outer wall 3 of the monopile 1 so that seawater cannot penetrate into the monopile 1.

(9) The beam 4 is supported against the outer wall 3 of the monopile 1 by means of a supporting construction. The supporting construction comprises a first lower supporting strut 6 and a second upper supporting strut 7.

(10) The first lower supporting strut 6 extends diagonally between the beam 4 and the outer wall 3 of the monopile 1. This is welded at one end to the underside of the beam 4 and at the other end to the outer wall 3 of the monopile 1.

(11) The second upper supporting strut 7 extends diagonally between the beam 4 and the outer wall 3 of the monopile 1. This is welded at one end to the upper side of the beam 4 and at the other end to the outer wall 3 of the monopile.

(12) The first lower supporting strut 6 and the second upper supporting strut 7 can also be formed as angle profiles, as rods or as tubes. These can be formed as solid profiles or as hollow profiles.

(13) The spaces formed in each case between the supporting struts 6, 7 can be filled. For example a gusset plate can be inserted therein.

(14) The beams 4 and the supporting struts 6, 7 do not essentially have to be made from metal; they can, for example, alternatively be made from a fiber-reinforced plastics material, from carbon fiber or another light plastics material. In this case, the beams and the supporting struts 6, 7 can be screwed to the outer wall 3 of the monopile 1.

(15) In the exemplary embodiment described, the anodes 2 or the beams 4 each extend on the outer wall 3 of the monopile at an angular distance from one another of 180°. According to the invention, the angle between the anodes 2 or beams 4 can be greater than or equal to 90° and smaller than or equal to 180° if only two anodes 2 are provided. If more than two anodes 2 are provided, the angle between the individual anodes 2 can be smaller than or equal to 90°.

LIST OF REFERENCE SIGNS

(16) 1 Monopile 2 Anode 3 Outer wall of the monopile 4 Beam 5 Power cable 6 First lower supporting strut 7 Second upper supporting strut 8 Opening