Anti-scouring offshore foundation

Abstract

The utility model provides an anti-scouring offshore foundation. The anti-scour offshore foundation comprises a pile body, geotechnical cloth arranged on the pile body in a sleeving mode, first concrete interlocking rows arranged at the two ends of the pile body in the first direction X and second concrete interlocking rows arranged at the two ends of the pile body in the second direction Y. The first direction X and the second direction Y are perpendicular to each other on the same overlook projection plane. The first concrete interlocking row and the second concrete interlocking row are in lap joint, the geotechnical cloth floats on the sea surface, and the first concrete interlocking row and the second concrete interlocking row are arranged on the upper surface of the geotechnical cloth. The concrete interlocking row is laid around the pile body, the geotechnical cloth is laid below the concrete interlocking row, and sediment is isolated in a physical isolation mode, so that the seabed around the single-pile foundation cannot be scoured by ocean current, and anti-scour combined protection can be achieved for the large-diameter single-pile foundation.

Description

Technical Field

[0001] The utility model relates to the technical field of large-diameter monopile foundations for offshore wind power, and particularly relates to an anti-scour offshore foundation. Background Art

[0002] In recent years, new energy such as wind power in China has developed rapidly, and the installed capacity has been continuously expanded. As an important part of the wind power industry, the construction pace of offshore wind power has been continuously accelerated, and remarkable development achievements have been made. As a commonly used foundation form in the offshore area, the monopile foundation has the advantages of short construction period and no need to tidy the seabed. Therefore, the monopile foundation has developed into the most widely used foundation form at home and abroad.

[0003] During the construction and operation and maintenance stages of a wind farm, especially for the monopile foundation, the monopile foundation will cause corresponding changes in the original hydrodynamic conditions such as waves and ocean currents around the foundation, breaking the original sediment balance, thereby causing local scour around the monopile. The existence of the scour pit weakens the pile-soil interaction of the soil on the monopile foundation, reduces the bearing capacity of the monopile foundation, and at the same time affects the natural vibration frequency of the whole machine, which will have a serious impact on the power generation and structural safety of the wind turbine. Therefore, effective anti-scour measures are the key to ensuring the normal operation of the wind farm units.

[0004] Most of the existing anti-scour schemes for monopile foundations adopt anti-scour measures such as riprap, sand blankets, and solidified soil. Riprap has high requirements for the bearing capacity of the seabed surface soil, and it is easy to damage submarine cables during the dumping process; the sand blanket is light in self-weight and is easily washed away by ocean currents; after solidifying the soil, the scour of the seabed structure part is serious, and "solidified soil clouds" are likely to appear around the monopile. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-scour offshore foundation, which can realize the combined anti-scour protection for large-diameter monopile foundations.

[0006] The technical solution of the utility model is: an anti-scour offshore foundation, including a pile body, a geotextile sleeved on the pile body, a first concrete mattress arranged at both ends of the pile body in the first direction X, and a second concrete mattress arranged at both ends of the pile body in the second direction Y. The first direction X and the second direction Y are perpendicular to each other on the same top view projection plane. The first concrete mattress and the second concrete mattress overlap. The geotextile floats on the sea surface, and the first concrete mattress and the second concrete mattress are placed on the upper surface of the geotextile.

[0007] In the above solution, a concrete mattress is laid around the pile body, and a geotextile is laid under the concrete mattress. The sediment is isolated by means of physical isolation, so that the seabed around the monopile foundation will not be scoured by ocean currents, and the combined anti-scour protection for large-diameter monopile foundations can be realized.

[0008] Preferably, both the first concrete interlocking row and the second concrete interlocking row are formed by a plurality of concrete interlocking blocks in a rectangular array, and adjacent concrete interlocking blocks are interconnected by ropes.

[0009] Preferably, the first concrete interlocking row and the second concrete interlocking row are arranged with a gap from the pile body, and solidified soil is arranged at this gap, and the solidified soil is placed on the geotextile.

[0010] Preferably, the geotextile is rectangular, and a through hole for the pile body to pass through is opened in the middle thereof, and the first concrete interlocking row and the second concrete interlocking row overlap to form a rectangle adapted to the geotextile.

[0011] Preferably, the erosion-proof offshore foundation further includes a pipeline and a submarine cable. The pipeline is arranged on the pile body, one end of the submarine cable is connected to the pipeline, and the other end of the submarine cable is placed on the first concrete interlocking row or the second concrete interlocking row.

[0012] Compared with the related art, the beneficial effects of the present utility model are as follows:

[0013] First, the erosion-proof offshore foundation increases the laying of concrete interlocking rows around the pile body, and lays geotextiles under the concrete interlocking rows, and isolates the sediment through physical isolation, so that the seabed around the single-pile foundation will not be scoured by ocean currents, and the erosion-proof joint protection of the large-diameter single-pile foundation can be realized;

[0014] Second, solidified soil is arranged between the first concrete interlocking row and the second concrete interlocking row and the pile body, and the solidified soil is placed on the geotextile, which avoids the problem of secondary scouring around the solidified soil and also avoids the problem of collision between the concrete interlocking row and the pile body;

[0015] Third, the submarine cable extends into the sea from the edge of the first concrete interlocking row or the second concrete interlocking row, and the damage of the submarine cable is avoided under the action of the concrete interlocking row;

[0016] Fourth, the erosion-proof offshore foundation forms a joint protection device through the first concrete interlocking row, the second concrete interlocking row, the geotextile and the solidified soil, and has a longer service life than a single protection device, and can save the cost in the later operation and maintenance stage. Description of the Drawings

[0017] Figure 1 It is a top view structural schematic diagram of the erosion-proof offshore foundation provided by the present utility model;

[0018] Figure 2 It is a partial schematic diagram of the front view structure of the erosion-proof offshore foundation provided by the present utility model;

[0019] Figure 3 It is a structural schematic diagram of the first concrete interlocking row;

[0020] Figure 4 It is a structural schematic diagram of the second concrete interlocking row.

[0021] In the attached drawings: 1. Pile body; 2. The first concrete interlocking row; 3. The second concrete interlocking row; 4. Solidified soil; 5. Geotextile; 6. Pipeline; 7. Submarine cable; 8. Concrete interlocking block; 9. Rope. Specific embodiments

[0022] The following will refer to the attached drawings and combine with embodiments to elaborate on the present utility model in detail. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. For the convenience of narration, words such as "upper", "lower", "left", and "right" hereinafter only indicate the same direction as the upper, lower, left, and right directions of the attached drawings itself, and do not limit the structure.

[0023] As Figure 1 、 Figure 2 shown, an anti-erosion marine foundation provided in this embodiment includes a pile body 1, a first concrete interlocking row 2, a second concrete interlocking row 3, solidified soil 4, a geotextile 5, a pipeline 6, and a submarine cable 7.

[0024] The cross-section of the pile body 1 is circular. The geotextile 5 is a square with a side length of 34.5 m, and a through hole for the pile body 1 to pass through is provided in the middle thereof. As Figure 2 shown, the inner wall of the through hole fits the outer surface of the pile body 1.

[0025] As Figure 3 、 Figure 4 shown, both the first concrete interlocking row 2 and the second concrete interlocking row 3 are formed by a plurality of concrete interlocking blocks 8 in a rectangular array, and adjacent concrete interlocking blocks 8 are interconnected by ropes 9. The concrete interlocking blocks 8 are formed by pouring through an interlocking block flexible mattress mold and are prefabricated in a factory to form the first concrete interlocking row 2 and the second concrete interlocking row 3. The concrete interlocking block 8 includes a compacted standard block formed by a regular rectangular block, which is located in the middle of the concrete interlocking row, and also includes a special-shaped anti-overturning standard block. The special shape is that one end is a rectangular block, and the other end is an isosceles trapezoid in a top view section and a triangle in a vertical section with an extended inclined surface. The anti-overturning standard block is located at the edge of the concrete interlocking row.

[0026] As Figure 2 shown, two first concrete interlocking rows 2 and two second concrete interlocking rows 3 are arranged on the upper surface of the geotextile 5. As Figure 1 shown, the two first concrete interlocking rows 2 are respectively arranged at both ends of the pile body 1 in the first direction X, and the two second concrete interlocking rows 3 are respectively arranged at both ends of the pile body 1 in the second direction Y. The first direction X and the second direction Y are perpendicular to each other in the same top view projection plane.

[0027] As Figure 1 、Figure 3 As shown, the first concrete interlocking row 2 extends in the second direction Y, such as Figure 1 , Figure 4 As shown, the second concrete interlocking row 3 extends in the first direction X. The two second concrete interlocking rows 3 overlap at both ends of the two first concrete interlocking rows 2, and the overlapping parts are connected by polypropylene ropes. Thus, the first concrete interlocking row 2 and the second concrete interlocking row 3 form a direction adapted to the geotextile 5. A rectangular hole for the pile body 1 to pass through is formed between the first concrete interlocking row 2 and the second concrete interlocking row 3.

[0028] Such as Figure 1 , Figure 2 As shown, the first concrete interlocking row 2 and the second concrete interlocking row 3 are arranged with a gap (rectangular block) from the pile body 1, and solidified soil 4 is arranged at this gap. The solidified soil 4 is placed on the geotextile 5. The geotextile 5 floats on the sea surface.

[0029] Such as Figure 2 As shown, the pipeline 6 is of a J-shaped structure and is arranged on the outer wall of the pile body 1. One end of the submarine cable 7 is connected to the pipeline 6, and the other end of the submarine cable 7 extends into the sea from the edge of the first concrete interlocking row 2 or the second concrete interlocking row 3.

[0030] The self-weight of the first concrete interlocking row 2 and the second concrete interlocking row 3 can overcome the scouring of ocean currents.

[0031] The anti-scouring offshore foundation provided by the present utility model can solve the problem that the anti-scouring measures for single-pile foundations in current offshore wind farm projects cannot meet the service life of 27 years and need to be re-dumped after a period of time.

[0032] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. An anti-scour marine foundation, comprising a pile body (1), characterized in that, It also includes a geotextile (5) sleeved on a pile body (1), a first concrete interlocking row (2) arranged at both ends of the pile body (1) in a first direction X, and a second concrete interlocking row (3) arranged at both ends of the pile body (1) in a second direction Y. The first direction X and the second direction Y are perpendicular to each other on the same top view projection plane. The first concrete interlocking row (2) and the second concrete interlocking row (3) overlap. The geotextile (5) floats on the sea surface, and the first concrete interlocking row (2) and the second concrete interlocking row (3) are placed on the upper surface of the geotextile (5).

2. The scour-resistant offshore foundation according to claim 1, characterized in that, Both the first concrete interlocking row (2) and the second concrete interlocking row (3) are formed by a plurality of concrete interlocking blocks (8) in a rectangular array, and adjacent concrete interlocking blocks (8) are interconnected by ropes (9).

3. The scour-resistant offshore foundation according to claim 1, characterized in that, The first concrete interlocking row (2) and the second concrete interlocking row (3) are arranged with a gap from the pile body (1), and solidified soil (4) is arranged at this gap. The solidified soil (4) is placed on the geotextile (5).

4. The scour-resistant offshore foundation according to claim 1, wherein The geotextile (5) is rectangular, and a through hole for the pile body (1) to pass through is opened in the middle thereof. The first concrete interlocking row (2) and the second concrete interlocking row (3) overlap to form a rectangle adapted to the geotextile (5).

5. The scour-resistant offshore foundation according to claim 1, characterized in that, It also includes a pipeline (6) and a submarine cable (7). The pipeline (6) is arranged on the pile body (1). One end of the submarine cable (7) is connected to the pipeline (6), and the other end of the submarine cable (7) extends into the sea from the edge of the first concrete interlocking row (2) or the second concrete interlocking row (3).

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