CN202265837U - Single-pile foundation for offshore wind generation set - Google Patents

Abstract

The utility model discloses a single pile foundation of an offshore wind power unit, which comprises a steel pipe pile whose upper end is connected with the fan tower through a flange plate and whose lower end is inserted below the mud surface of the seabed. The steel pipe piles are evenly fixed radially with steel skirts. Wherein the outer periphery of the steel pipe pile is preferably provided with 3-12 identical steel skirt plates, the angle between the axis of the steel pipe pile and the bottom surface of the steel skirt plate is an acute angle; the steel skirt plate also includes The thickness gradually decreases from top to bottom. The single-pile foundation of the offshore wind power unit of the utility model only needs to weld the steel skirt plate to the existing single-pile foundation, has simple manufacture, low construction cost, and is easy to operate during construction.

Description

A single pile foundation for offshore wind turbines

technical field

The utility model relates to a foundation of a wind turbine, in particular to a single-pile foundation used for the foundation of an offshore wind turbine.

Background technique

Nowadays, the global energy crisis is becoming more and more serious, especially coal and oil, which are the main energy sources, are not only limited and non-renewable, but also cause serious pollution to the environment. In recent years, the greenhouse effect and global warming have become the focus of global attention. crisis. Therefore, clean and green energy will inevitably become a future trend. And wind energy is one of them. In recent years, the world's wind energy market has been growing at a rate of 40% every year, and wind power has become a new energy source with the most mature technology, the most large-scale development and commercial development prospects. Compared with inland wind power, coastal and offshore wind power has the advantages of high wind speed, low wind shear, low turbulence, high output and long service life. Offshore wind power has gradually become a new bright spot in the development of wind power and has attracted the attention of many countries in the world.

There are mainly four types of offshore wind power foundations: pile foundation, gravity foundation, caisson foundation and floating foundation. At present, the traditional pile foundation is the most widely used. The pile diameter of this foundation structure is generally 4m, and the wall thickness is about 1% of the pile diameter. This foundation is easy to manufacture and does not need any seabed preparation. The water area of 30m is especially suitable for shallow water area, and its economic value can be well reflected. However, there are big problems in the application of the traditional single-pile foundation. The vertical load on the single-pile fan structure is composed of the gravity of the foundation and the entire structure. The side friction and surface resistance of the single-pile foundation are relatively large. The bearing capacity is easy to meet the requirements. Compared with the vertical load, the horizontal bending moment of the single-pile wind turbine structure is very large, resulting in a large horizontal displacement. In order to control the horizontal displacement, the traditional single-pile foundation can only adopt the method of increasing the pile diameter. This method not only causes a huge "waste" of vertical bearing capacity, but also puts forward higher requirements for piling construction, making the pile The cost of the foundation increases, the difficulty of construction increases, and the construction period increases. Therefore, it is necessary to address the above problems and propose a new type of single pile foundation that can effectively reduce the cost of using the single pile foundation for wind power development.

Utility model content

The purpose of this utility model is to solve the problem that the single pile foundation of the existing offshore wind turbine is easy to displace horizontally, and to provide a safe and reliable single pile foundation for the offshore wind turbine with good horizontal bearing capacity. The single pile foundation does not need to increase the pile diameter , has the characteristics of simple structure, difficult construction and low construction cost.

In order to solve the above technical problems, the utility model is realized through the following technical solutions:

A single pile foundation for offshore wind turbines, comprising a steel pipe pile whose upper end is connected to the wind turbine tower through a flange and whose lower end is inserted below the mud surface of the seabed. The outer peripheral surface of the steel pipe pile below the mud surface is a steel pipe pile Steel skirts are evenly fixed radially.

3-12 identical steel skirt plates are arranged on the periphery of the steel pipe cylinder.

The included angle between the axis of the steel pipe pile and the bottom surface of the steel skirt is an acute angle.

The included angle between the axis of the steel pipe pile and the bottom surface of the steel skirt is 15°-75°.

The thickness of the steel skirt plate gradually decreases from top to bottom.

The beneficial effect of the single pile foundation of the offshore wind turbine set of the utility model is as follows: the utility model has a certain number of steel skirt plates evenly fixed on the outer peripheral surface of the steel pipe piles of the existing single pile foundation in the radial radial shape of the steel pipe piles, and utilizes the skirts to The slab increases the contact surface of steel pipe piles under the mud surface of the single pile foundation to achieve the purpose of improving the horizontal bearing capacity of the single pile foundation, thereby avoiding the problem that the pile diameter is too thick to control the horizontal displacement of the traditional single pile foundation; The utility model sets the angle between the axis of the steel pipe pile and the bottom surface of the steel skirt as an acute angle, and the thickness of the steel skirt gradually decreases from top to bottom, reducing the contact surface between the lower end of the steel skirt and the mud surface of the seabed, so that the welding The construction process of steel pipe piles with steel skirts is easier. Under the premise of simultaneously satisfying the vertical bearing capacity and the horizontal bearing capacity, the utility model does not make the pile diameter too large, reduces the construction and construction costs, improves the construction speed, and shortens the construction period.

Description of drawings

Fig. 1 is the longitudinal sectional view of the single pile foundation of the utility model wind turbine unit connected with the fan tower;

Fig. 2 is the top view of the single pile foundation of the wind turbine of the present invention;

Fig. 3 is a side view of the single pile foundation of the wind turbine unit of the present invention connected with the wind turbine tower.

In the figure, 1 steel pipe pile, 2 steel skirt, 3 flange, 4 fan tower

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

As shown in Figure 1, the single pile foundation of the wind turbine foundation of the present invention is composed of steel pipe piles 1 and steel skirts 2, as shown in the top view of Figure 2, four identical steel skirts 2 are evenly welded on the steel pipe piles 1 on the outer peripheral surface, and radially distributed evenly along the radial direction of the steel pipe pile 1, the angle between the two adjacent steel skirts is the same; the height of the top surface of the steel skirt 2 is the same as the designed mud surface height on the steel pipe pile Flat, the bottom surface of the steel skirt 2 intersects the axis of the steel pipe pile with an included angle of 60°. In the technical solution of the utility model, the number of steel skirt plates 2 welded on the outer wall of the steel pipe pile 1 can be adjusted according to the design requirements, preferably 3-12 pieces; the bottom surface of the steel skirt plate 2 is a slope, and The included angle of the axis is an acute angle, preferably 15° to 75°, and the thickness of the steel skirt plate gradually decreases from top to bottom, so that the contact area of the single pile foundation of the present invention is small, the pressure is relatively large, and the pile is easy to sink. Taking steel pipe piles with a pile diameter of 4m as an example, the steel pipe piles in one embodiment of the wind turbine foundation single pile foundation of the utility model have a length of 60m, a wall thickness of 4cm, a steel skirt plate length of 8m, a width of 3m, and a thickness of the upper end of 3cm, the thickness of the lower end is 1cm.

During use, it is only necessary to position the single-pile foundation of the wind turbine foundation of the present invention, that is, to sink the single-pile foundation into the seabed, so that the top surface of the steel skirt plate 2 is equal to or lower than the height of the mud surface. The upper end of the monopile foundation of the utility model is connected with the flange 3, and is connected with the fan tower 4 through the flange 3.

The above description is only a schematic description of the preferred embodiments of the utility model, the utility model is not limited to the above-mentioned specific implementation, those of ordinary skill in the art under the inspiration of the utility model, without departing from the purpose of the utility model In the case of the protection scope of the claims, many forms of specific transformations can be made, and these all belong to the protection scope of the present utility model.

Claims (5)

1. A single pile foundation for offshore wind turbines, comprising a steel pipe pile whose upper end is connected to the wind turbine tower through a flange and whose lower end is inserted into the mud surface of the seabed. Steel skirt plates are evenly fixed radially on the outer peripheral surface in the form of steel pipe piles. 2. The monopile foundation of an offshore wind turbine according to claim 1, wherein 3-12 pieces of said steel skirt boards are provided. 3 . The single pile foundation for offshore wind turbines according to claim 1 , wherein the angle between the axis of the steel pipe pile and the bottom surface of the steel skirt is an acute angle. 4 . 4. The single-pile foundation of an offshore wind turbine according to claim 3, wherein the angle between the axis of the steel pipe pile and the bottom surface of the steel skirt is 15°-75°. 5 . The monopile foundation for offshore wind turbines according to claim 1 , wherein the thickness of the steel skirt gradually decreases from top to bottom. 6 .

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