Connection structure for a marine installation, marine installation and method of erecting a marine installation

1. A marine installation, comprising:

a superstructure for power engineering, said superstructure containing a high voltage direct current substation having an alternating current to direct current converter module in order to enable DC power transmission of AC power to an onshore station;

a foundation having a number of connection structures for connecting a seabed anchor to said superstructure, each connection structure including:

a vertical, horizontally encircling wall bounding a spatial region;

a first connecting section configured for connection to said superstructure; and

a second connecting section configured for connection to the seabed anchor, said second connecting section having a shape transition of a cross-sectional shape of said encircling wall to a cross-sectional shape of an upper end of the seabed anchor, said shape transition proceeding from substantially rectangular to circular; and

at least one self-priming pump within the spatial region in order to supply and/or to discharge seawater as a coolant to and/or from the superstructure;

a number of seabed anchors and the number of connection structures being equal and being one or more;

wherein each of said seabed anchors is connected to a respective said connection structure by way of said second connecting section;

wherein said at least one connection structure is connected to said superstructure by way of said first connecting section;

a sea cooling facility with supply pipes and/or discharge pipes, which are arranged at least partially within the seabed anchor and/or within the spatial region of said connection structure.

2. The marine installation according to claim 1 , wherein a shape of said encircling wall is substantially rectangular or square, and said encircling wall is formed with planar sections and rounded corners between said planar sections.

3. The marine installation according to claim 1 , wherein said first connecting section has a circumferentially completely encircling flange on said encircling wall, said flange being formed with through holes for screws for connection to the superstructure.

4. The marine installation according to claim 1 , wherein said connection structures have a base connected to said encircling wall and at least partially closing off said spatial region toward the bottom.

5. The marine installation according to claim 1 , wherein said connection structures have at least one cable connector and/or cable plug within said spatial region for electrically connecting an underwater cable to a cable of the superstructure.

6. The marine installation according to claim 1 , wherein said connection structures have:

a horizontal surface area attached to said encircling wall outside said spatial region; and

a reversibly closable opening formed in said encircling wall in order to allow access from said spatial region to said horizontal surface area.

7. The marine installation according to claim 1 , wherein said number of said connection structures and said number of said seabed anchors is four.

8. The marine installation according to claim 1 , wherein said connection structure is disposed substantially below a 100-year wave level and above a lowest tidal range level.

9. The marine installation according to claim 1 , wherein each said seabed anchor comprises:

a hollow driven pile to be driven or driven into a seabed below said superstructure and said pile having a smaller cross-sectional size than the spatial region of the connection structure; and/or

a suction bucket to be anchored or anchored to the seabed by way of a pressure difference and said suction bucket having a larger cross-sectional size than the spatial region of the connection structure.

10. The marine installation according to claim 1 , wherein said superstructure has at least one supporting wall arranged vertically substantially in line with a section of said vertical wall of said connection structure.