OFFSHORE FLOATING-TYPE WIND POWER COMBINED SEMI-SUBMERSIBLE PLATFORM FOUNDATION

Abstract

An offshore floating-type wind power combined semi-submersible platform foundation has at least three stand columns that form an enclosure having a polygonal structure. The adjacent stand columns are connected by an upper support and a lower support. Each stand column is composed of an upper column body and a lower column body that are arranged coaxially. An upper portion of the upper column body is provided with a support block, the upper support rests on the support block. A lower portion of the upper column body is provided with a lower support connecting portion that is connected to the lower support. With the structural form of the offshore floating-type wind power combined semi-submersible platform foundation, the requirements for a manufacturing site and a combination site are greatly reduced, providing the possibility of large-scale offsite construction.

Claims

1. An offshore floating-type wind power combined semi-submersible platform foundation, comprising at least three stand columns, wherein the at least three stand columns form an enclosure of a polygonal structure, adjacent stand columns of the at least three stand columns are connected by using an upper support and a lower support, the at least three stand columns comprises an upper column body and a lower column body, the upper column body and the lower column body are coaxially arranged, a support block is disposed on an upper part of the upper column body, the upper support is positioned on the support block, a lower support connection part is disposed on a lower part of the upper column body, and the lower support connection part is connected to the lower support.

2. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein a bump is disposed at a front end of the support block, and the upper support is positioned on the bump.

3. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein a front end of the lower support connection part extends beyond an outer edge of the lower column body, a support plate is disposed on a lower side at the front end of the lower support connection part, the support plate is fastened to the front end of the lower support connection part through a ring-shaped buckle, and the lower support is positioned on the support plate.

4. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein the at least three stand columns form an enclosure of a triangular or quadrangular structure.

5. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein the lower support connection part is disposed on an upper top surface of the lower column body.

6. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein the upper support and the lower support are both strip-shaped beams.

7. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 1, wherein the upper column body, the lower column body, the upper support, and the lower support are internally hollow structures.

8. The offshore floating-type wind power combined semi-submersible platform foundation according to claim 3, wherein a hollow-out hole is provided in the support plate, and a joint of the lower support connection part and the lower support is positioned at the hollow-out hole.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 is a schematic diagram of a structure of a three-stand-column combined type semi-submersible corrosion platform foundation;

[0015] FIG. 2 is a schematic diagram of a structure of a four-stand-column combined type semi-submersible corrosion platform foundation; and

[0016] FIG. 3 is a schematic diagram of a structure of a stand column in which an assembly auxiliary part is disposed at an included angle of 60 degrees.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Refer to FIG. 1 to FIG. 3, an offshore floating-type wind power combined semi-submersible platform foundation provided in the present invention mainly includes stand columns 1 and a support structure. A combined semi-submersible platform foundation is preferably of a four-column type or a three-column type. Refer to FIG. 2, the four-column type mainly includes four stand columns 1, four lower supports 2, and four upper supports 3. Refer to FIG. 1, the three-column type mainly includes three stand columns 1, three lower supports 2, and three upper supports 3. The stand columns 1, the lower supports 2, the upper supports 3 and an assembly auxiliary part are constructed on a manufacturing site. The parts occupy less space, are convenient to transport, and can be constructed in a region with low labor cost.

[0018] The stand column 1 includes an upper column body 11 and a lower column body 12. A cross section of the upper column body may be circular or polygonal, and a cross section of the lower column body may be circular or polygonal. An area of the cross section of the upper column body is smaller than an area of the cross section of the lower column body. The upper column body 11 is fastened to the lower column body 12 by welding, and the upper column body 11 and the lower column body 12 are coaxially disposed. The upper column body 11 and the lower column body 12 are preferably cylindrical structures.

[0019] The upper support 3 is a strip-shaped structural beam, and a cross section of the upper support is circular or polygonal. To facilitate construction, the upper support 3 is commonly a strip-shaped structural beam with a rectangular cross section.

[0020] The lower support 2 is a strip-shaped structural beam, and a cross section of the lower support is circular or polygonal. To facilitate construction, the lower support 2 is commonly a strip-shaped structural beam with a rectangular cross section. Before combination, the lower support 2 needs to connect and fasten to the stand column 1 through a lower support connection part 21, a ring-shaped buckle 22, and a support plate 23. The section of the lower support connection part 21 matches the section of the lower support 2. The lower support connection part 21 is welded at a joint of the upper column 11 and the lower column body 12 in advance. After the combination, each stand column 1 is connected to the two lower supports 2, and two lower support connection parts 21 are welded on the stand column 1.

[0021] When the semi-submersible platform foundation is of the four-column type, an angle between the two lower support connection parts 21 that are welded with the joint of the upper column body 11 and the lower column body 12 is 90 degrees. When the semi-submersible platform foundation is of the three-column type, an angle between the two lower support connection parts 21 that are welded with the joint of the upper column body 11 and the lower column body 12 is 60 degrees.

[0022] A support block 4 is welded on the upper part of the upper column body 11, and a bump 41 is disposed at the front end of the support block 4. The support block 4 is configured to temporarily put the upper support 3, and is specifically used for welding between the upper support 3 and the upper column body 11. A portion that is of the bump 41 and that is configured to support a lower side surface of the end part of the upper support is slightly higher than a surface of the support block 4. Near a side surface of the upper column body 11, there is sufficient space for exposing a contact beam between the upper support 3 and the side surface of the upper column body 11 to facilitate welding.

[0023] The lower support connection part 21 is pre-welded at the joint of the lower part of the upper column body 11 and the lower column body 12. The specification of the lower support connection part 21 matches that of the lower support 2. The front end of the lower support connection part 21 extends the side of the lower column body 12. A ring-shaped buckle 22 is disposed at the front end of the lower support connection part 21. The support plate 23 is fastened to the lower side of the lower support connection part 21 through the ring-shaped buckle 22. The support plate partially exceeds the lower support connection part 21 for supporting the lower support 2. A hollow-out hole 24 is provided in the support plate 23, and the hollow-out hole 24 is provided, at a joint of the lower support connection part 21 and the lower support 2, of a workpiece for welding.

[0024] An implementation method of the offshore floating-type wind power combined semi-submersible platform foundation that is of a three-column-body or four-column-body structure is as follows: [0025] 1. The stand column 1, the upper support 3, the lower support 2 are constructed on a site A, and the support block 4 and the lower support connection part 21 are mounted on the stand column 1. The upper support 3 and the lower support 2 are rectangular strip-shaped beams, and are internally hollow structures, so that weight is reduced. During construction of the stand column 1, the upper column body 11 and the lower column body 12 are welded into a complete main body. The upper column body 11 and the lower column body 12 are internally hollow structures, and can be internally blocked, so that water is injected for attitude adjustment. Two support blocks 4 are welded on the upper part of the upper column body 11, and an included angle between the support blocks 4 is kept to be greater than 60 degrees. When a three-stand-column 1 form is adopted, the included angle is 60 degrees. When a four-stand-column 1 form is adopted, an included angle is 90 degrees. When a five-stand-column form is adopted, an included angle is 108 degrees, and so on. The support block 4 is used for lap joint of the upper support 3. On the lower part of the column body, namely the joint between the upper column body 11 and the lower column body 12, the lower support connection part 21 is pre-welded. After being welded, the lower support connection part 21 extends out from the lower column body 12. In addition, the ring-shaped buckle 22 and the support plate 23 are mounted on the lower support connection part 21 for lap joint of the lower support 2. [0026] 2. The constructed stand column 1, upper support 3, and lower support 2 are transported by a transport ship to a wharf near a wind farm, namely site B. [0027] 3. On the wharf of the site B, two column bodies 1 are put into water through a crane or a crawler crane. The column bodies 1 stably suspend under buoyancy force thereof. Under a simple mooring condition of the wharf, a relative distance between two column bodies is controlled. The two column bodies 1 are connected and fastened by the pre-constructed support block 4 and lower support connection part 21 through the upper support 3 and the lower support 2. [0028] 4. When the semi-submersible platform foundation is of the three-column-body structure, the last column body 1 is put into water through a crane/crawler crane, and the column body 1 is dragged to a proper position through a tugboat. The column body 1 is connected to the two constructed column bodies 1 by the pre-constructed support block 4 and lower support connection part 21 through the upper support 3 and the lower support 2. In this way, the semi-submersible platform foundation of the three-column-body structure is constructed on the site B. [0029] 5. When the semi-submersible platform foundation is of the four-column-body structure, step 3 is first repeated to accomplish construction of two groups of column bodies 1 connected in pairs. The two groups of column bodies connected in pairs are vertically arranged in water. An angle and a distance between the two groups of connected column bodies are controlled by simple mooring. The two groups of connected column bodies are arranged in parallel with a proper distance. Then, the two groups of column bodies connected in pairs are connected by the pre-constructed support block 4 and lower support connection part 21 through the upper support 3 and the lower support 2. In this way, the semi-submersible platform foundation of the four-column form is constructed on the site B.