Single pile foundation of offshore wind turbine generator

Abstract

The single-pile foundation comprises a single-pile body, a fan tower drum and a supporting assembly, the lower end of the single-pile body is located on the seabed, the upper end of the single-pile body extends upwards, the fan tower drum is arranged at the upper end of the single-pile body, the supporting assembly comprises a sleeve and a plurality of supporting pieces, and the sleeve is sleeved with the supporting pieces. The sleeve is arranged on the single pile body in a penetrating mode, the multiple supporting pieces are arranged around the sleeve in the circumferential direction at intervals, one end of each supporting piece is connected with the sleeve, and the other end of each supporting piece is located on the seabed. The single pile foundation of the offshore wind turbine generator set has the advantages of being high in stability, good in coordination, low in investment cost and good in applicability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of offshore wind turbine units, in particular to a single-pile foundation of an offshore wind turbine unit. BACKGROUND

[0002] The foundation types of wind turbine units for offshore wind farms mainly include four types of pile foundations, gravity foundations, suction cylinder foundations and floating foundations, wherein the pile foundation can be subdivided into single-pile foundations, multi-leg foundations, jacket foundations and high-pile pile cap foundations. The single-pile foundation refers to an independent foundation that uses a pile to bear and transfer the load of the upper structure. The single-pile foundation is widely used in foreign offshore wind farms due to its convenient and fast construction and good economy, and in recent years, with the improvement of the construction capacity of offshore wind power construction ships and equipment, the proportion of single-pile foundations of offshore wind turbine units in domestic offshore wind farms is increasing.

[0003] The overall structure of the offshore wind turbine is subjected to wind-wave-flow-soil coupling. In the related art, the main machine manufacturers design the entire field using envelope loads, and the main machine manufacturers and design institutes analyze the overall structure of the offshore wind turbine in isolation, which causes the application frequency range of the overall support structure of the wind turbine to be conservative and other factors, resulting in poor stability of the single-pile foundation under the action of wind-wave-flow-soil coupling, thereby resulting in poor overall integrity, uncoordinated stiffness and high cost of the final support structure. SUMMARY

[0004] The application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the application provides a single-pile foundation of an offshore wind turbine unit, which has high structural stability, good coordination, and also reduces investment costs and has universal applicability.

[0005] The single-pile foundation of the offshore wind turbine unit according to the application embodiment comprises:

[0006] a single-pile body, a lower end of the single-pile body being located on the seabed, and an upper end of the single-pile body extending upward;

[0007] a wind turbine tower, the wind turbine tower being arranged at the upper end of the single-pile body;

[0008] a support assembly, the support assembly comprising a sleeve and a plurality of support pieces, the sleeve being arranged on the single-pile body, the plurality of support pieces being arranged in a circumferential direction around the sleeve, one end of the support piece being connected to the sleeve, and the other end of the support piece being located on the seabed.

[0009] The single-pile foundation of the offshore wind turbine unit according to the application embodiment has high structural stability, good coordination, and also reduces investment costs and has universal applicability.

[0010] In some embodiments, the support assembly further comprises a plurality of rib plates, the plurality of rib plates being arranged around the circumference of the monopile body and corresponding to the plurality of supports one by one, one end of the rib plate being connected to the support, and the other end of the rib plate being connected to the outer wall surface of the monopile body.

[0011] In some embodiments, the monopile body is a steel pipe pile without a transition section with a diameter of 7m-8m.

[0012] In some embodiments, the monopile body has a wall thickness of 63mm-98mm, a pile length of 70m-80m, a pile top elevation of 10m-15m, a pile bottom elevation of 55m-65m, a soil penetration depth of about 40m-50m, and a lower end located in a sand-silty soil layer.

[0013] In some embodiments, the monopile foundation of the offshore wind turbine further comprises a connecting piece arranged at the upper end of the monopile body to connect the upper end of the monopile body and the tower of the wind turbine. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of a monopile foundation structure of an offshore wind turbine according to an embodiment of the application.

[0015] Reference signs: 1, monopile body; 2, tower of wind turbine; 3, support assembly; 31, sleeve; 32, support; 33, rib plate; 4, connecting piece; 41, first flange; 42, second flange; 43, bolt. DETAILED DESCRIPTION

[0016] Embodiments of the application are described in detail below with reference to examples shown in the drawings. The embodiments described below by way of example are intended to explain the application, and are not to be understood as limiting the application.

[0017] As shown in Figure 1 , the monopile foundation structure of the offshore wind turbine according to an embodiment of the application comprises a monopile body 1, a tower 2 of the wind turbine and a support assembly 3. Specifically, the monopile body 1 is a steel pipe pile without a transition section with a diameter of 7m-8m. Preferably, the diameter of the monopile body 1 is 7.5m. The monopile body 1 has a wall thickness of 63mm-98mm, a pile length of 70m-80m, a pile top elevation of 10m-15m, a pile bottom elevation of 55m-65m, a soil penetration depth of about 40m-50m, and a lower end located in a sand-silty soil layer. Preferably, the pile length of the monopile body 1 is 74m, the pile top elevation is 13m, the pile bottom elevation is 61m, and the soil penetration depth of the monopile body 1 is 47m.

[0018] The lower end of the monopile body 1 is located on the seabed, and the upper end of the monopile body 1 extends upward. The wind turbine tower 2 is arranged at the upper end of the monopile body 1. The support assembly 3 comprises a sleeve 31 arranged on the monopile body 1 and a plurality of support members 32 arranged around the sleeve 31. One end of the support member 32 (such as the upper end of the support member 32 shown in the figure) is connected to the sleeve 31, and the other end of the support member 32 (such as the lower end of the support member 32 shown in the figure) is located on the seabed. Figure 1 The upper end of the support member 32 is connected to the sleeve 31, and the lower end of the support member 32 is located on the seabed. Figure 1 The upper end of the support member 32 is connected to the sleeve 31, and the lower end of the support member 32 is located on the seabed.

[0019] Specifically, the sleeve 31 increases the contact area between the upper end of the support member 32 and the monopile body 1, not only improving the firmness of the connection between the support member 32 and the monopile body 1, but also improving the support of the support member 32 on the monopile body 1. The upper end of the support member 32 is connected to the outer wall of the sleeve 31, and the lower end of the support member 32 is inclined away from the monopile body 1, increasing the support range of the support member 32 on the monopile body 1, thereby improving the stability of the monopile body 1.

[0020] The monopile foundation of the offshore wind turbine generator of the embodiment improves the stability of the monopile foundation structure as a whole, thereby improving the uplift resistance, compression resistance, horizontal bearing capacity, horizontal stiffness, overall stability and coordination of the monopile foundation structure. The support assembly 3 has a simple structure, is easy to process, reduces investment costs, and has universal applicability.

[0021] In some embodiments, the support assembly 3 further comprises a plurality of rib plates 33 arranged around the monopile body 1 in a spaced manner, and the plurality of rib plates 33 correspond one-to-one to the plurality of support members 32. One end of the rib plate 33 is connected to the support member 32, and the other end of the rib plate 33 is connected to the outer wall of the monopile body 1.

[0022] Specifically, the rib plate 33 is triangular, one side of the rib plate 33 is connected to the outer wall of the monopile body 1, and the other side of the rib plate 33 is connected to the support member 32 adjacent to the outer wall of the monopile body 1. Not only does it strengthen the stability of the connection between the support member 32 and the monopile body 1 and improve the structural strength of the monopile foundation structure, but also makes the support member 32 less likely to bend. The arrangement of the rib plate 33 also increases the contact area of the monopile body 1 below the mud surface, improves the horizontal bearing capacity of the monopile foundation structure, avoids the problem of excessively large pile diameter caused by controlling the horizontal displacement of the traditional monopile body 1, and further improves the horizontal bearing capacity, horizontal stiffness, overall stability and coordination of the monopile foundation of the offshore wind turbine generator of the embodiment.

[0023] In some embodiments, the monopile foundation of the offshore wind turbine generator further comprises a connecting piece 4 arranged at the upper end of the monopile body 1 to connect the upper end of the monopile body 1 and the wind turbine tower 2. Specifically, the connecting piece 4 comprises a first flange 41 arranged at the upper end of the monopile body 1, a second flange 42 arranged on the wind turbine tower 2, and a bolt 43 connecting the first flange 41 and the second flange 42, so that the wind turbine tower 2 is simply and firmly connected on the monopile body 1.

[0024] In some embodiments, the monopile foundation of the offshore wind turbine generator further comprises an auxiliary member (not shown) comprising a berthing member, a ladder structure, an outer platform structure, an impressed current system, etc. During installation, the berthing member, the ladder structure, the outer platform structure, the impressed current system, etc. are first designed as an integral cage structure, i.e. the berthing member, the ladder structure, the outer platform structure, and the impressed current system are welded on the ring beam structure, and then the integral cage structure is integrally installed on the monopile body 1 after the pile sinking is completed.

[0025] Specifically, the outer platform is a manned platform for connecting the monopile body 1 and the first flange 41, and the outer platform further has a crane support, an operation and maintenance warehouse, and an engine box, etc. The berthing member is composed of two main berthing steel pipes, the main berthing steel pipes are welded on the ring beam structure through connecting steel pipes, and the berthing steel pipes are welded with the ladder structure therebetween. The integral cage structure has good rigidity after being integrally welded, and is convenient to install and causes little damage to the monopile body 1.

[0026] In the description of the invention, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the invention.

[0027] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include at least one of the features. In the description of the invention, the meaning of “a plurality of” is at least two, such as two, three, etc., unless otherwise specifically limited.

[0028] In the present invention, unless specifically defined otherwise or limited differently, the terms "mount", "connect", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can be detachable connection, or integrated; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances.

[0029] In the present invention, unless specifically defined otherwise or limited differently, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0030] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification and the features of different embodiments or examples without contradiction.

[0031] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and cannot be construed as limiting the invention, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the invention.

Claims

1. A monopile foundation for an offshore wind turbine, characterized in that, include: The monopile body (1) has its lower end located on the seabed and its upper end extending upward. Wind turbine tower (2), the wind turbine tower (2) is located at the upper end of the monopile body (1); The support assembly (3) includes a sleeve (31) and a plurality of support members (32). The sleeve (31) is inserted through the monopile body (1). The plurality of support members (32) are arranged circumferentially around the sleeve (31). One end of the support member (32) is connected to the sleeve (31), and the other end of the support member (32) is located on the seabed.

2. The monopile foundation for an offshore wind turbine according to claim 1, characterized in that, The support component (3) further includes a plurality of ribs (33), which are arranged circumferentially around the monopile body (1) and correspond one-to-one with the plurality of support members (32). One end of the rib (33) is connected to the support member (32), and the other end of the rib (33) is connected to the outer wall surface of the monopile body (1).

3. The monopile foundation for an offshore wind turbine according to claim 1, characterized in that, The single pile body (1) is a steel pipe pile without transition section with a diameter of 7m to 8m.

4. The monopile foundation for an offshore wind turbine according to claim 1, characterized in that, The wall thickness of the single pile body (1) is 63mm to 98mm, the pile length of the single pile body (1) is 70m to 80m, the pile top elevation is 10m to 15m, the pile bottom elevation is 55m to 65m, the soil penetration depth of the single pile body (1) is about 40m to 50m, and the lower end of the single pile body (1) is located in a sand-silt layer.

5. The monopile foundation for an offshore wind turbine according to claim 1, characterized in that, It also includes a connector (4), which is disposed at the upper end of the monopile body (1) to connect the upper end of the monopile body (1) and the wind turbine tower (2).

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