Wave load suppression structure for offshore wind power single pile foundation

Abstract

The application discloses a wave load suppression structure for offshore wind power single-pile foundation. When the offshore wind turbine single-pile foundation is subjected to wave load, the shape-optimized annular curved surface plate installed on the single-pile foundation can concentrate the wave energy near the rear edge of the single-pile foundation column. The annular curved surface plate can not only reduce the horizontal wave force, but also reduce the wave force acting on the single-pile foundation. The installed annular curved surface plate is installed below the water surface, the installation depth is 1 / 10-1 / 8 of the water depth, and the outer diameter of the annular curved surface plate is 1.5-2 times of the diameter of the single-pile foundation. The method can obviously suppress the horizontal wave force and load on the single-pile foundation by using the annular curved surface plate and the supporting member, can concentrate the wave energy near the rear edge of the single-pile foundation column, and can provide certain protection for the single-pile foundation. In addition, the annular curved surface plate structure is simple, can be prefabricated and assembled, and is convenient to construct.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of offshore wind power engineering, and particularly relates to a wave load suppression structure for an offshore wind power single pile foundation. BACKGROUND

[0002] For offshore wind turbine foundations, the single pile foundation is the most widely used and has the largest number of constructions. With the maturity of construction technology, the size of the single pile foundation is becoming larger and larger. Therefore, reducing the wave load of the single pile foundation is becoming more and more important for the safety of offshore wind turbine structures and the reduction of construction costs. In the theoretical work, the wave action between the wave and the large pile foundation is mainly modeled and theoretically derived by using the linear diffraction theory. Many scholars have also proposed some numerical models on this basis. For example, one or more additional columns are arranged around the single pile foundation to reduce the amplitude or eliminate scattered waves. However, these methods have some shortcomings, such as poor wave load suppression effect and easy damage to the model in actual engineering. In order to reduce the wave load of the single pile foundation in the actual working environment, it is necessary to suppress the wave load of the offshore wind power single pile foundation. SUMMARY

[0003] Based on the above problems, the purpose of the present application is to provide a wave load suppression structure for an offshore wind power single pile foundation, which is used to reduce the wave load of the single pile foundation when working in the marine environment and improve its safety.

[0004] The technical scheme adopted by the present application is as follows: a wave load suppression structure for an offshore wind power single pile foundation, wherein a ring-shaped horizontal curved plate is fixedly installed on the single pile foundation, the ring-shaped curved plate is a curve in the diameter direction and the circumferential direction, and the shape of the ring-shaped horizontal curved plate is controlled by the following curved surface equation,

[0005]

[0006] The selected 12 curved surface equation control parameters are:

[0007] a1=0.00405524905486886, a2=-0.00372424304670124,

[0008] a3=0.00370228038998520, a4=-0.000867769514806148,

[0009] b1=0.00312701865564095, b2=0.0176812315247391,

[0010] b3 = -0.0252935771472117, b4 = 0.00426578109644089,

[0011] c1 = -0.00937797589173304, c2 = -0.0244105638645872,

[0012] c3 = -0.00540824684608461, c4 = -0.00692238081105743;

[0013] wherein d is the installation depth of the horizontal curved panel, the distance from the water surface is 0.1h-0.125h, wherein h is the submerged depth of the single pile foundation, r and theta are polar coordinate parameters of the curved surface control equation;

[0014] Further, the inner diameter of the annular curved panel is the same as the outer diameter of the single pile foundation, the outer diameter of the annular curved panel is 1.5D-1.8D, D is the diameter of the single pile foundation, and the thickness of the annular curved panel is 0.1-0.125 of the design wave height.

[0015] Further, the application also comprises a casing, the height of the casing should exceed the curved panel by a certain height l, l is 1 / 6-1 / 5 of the diameter D of the single pile foundation, the annular horizontal curved panel is fixedly connected with the single pile foundation through the casing, in order to ensure that the horizontal curved panel has certain rigidity and stability, a plurality of groups of reinforcing rib plates are fixedly connected between the annular horizontal curved panel and the casing along the circumference, and the reinforcing rib plates are located on the upper plane and the lower plane of the annular horizontal curved panel.

[0016] Further, the rib plates are preferably arranged at an interval of 30° along the circumference.

[0017] Further, the rib plates are in the shape of right-angled triangular rib plates.

[0018] The wave load suppression structure of the application has the advantages and beneficial effects that the wave load suppression structure has a relatively obvious inhibitory effect on the horizontal wave force and load on the single pile foundation, the wave energy is gathered near the rear edge of the single pile foundation column body, the single pile foundation is provided with certain protection ability, and the structure is simple, can be prefabricated and assembled, and has the advantages of convenient construction. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the wave load suppression method of the offshore wind power single pile foundation curved panel, the following will be more specifically introduced by using several drawings. The curved panel model used in the drawings is obtained by designing a curved surface equation, and different sizes of single pile foundations can be scaled on this basis.

[0020] Figure 1The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation;

[0021] Figure 2 The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation;

[0022] Figure 3 The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation;

[0023] Figure 4 The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation;

[0024] Figure 5 The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation;

[0025] Figure 6 The overall structure schematic diagram of the curved surface plate of the offshore wind power single pile foundation; DETAILED DESCRIPTION

[0026] The method will be further described below in conjunction with the accompanying drawings and examples. The described examples are only part of the method. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of the method. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as generally understood by those skilled in the art.

[0027] Example 1

[0028] As shown in Figure 1 , the method provides a wave load suppression structure for offshore wind power single pile foundation, which is used to reduce the wave load of single pile foundation when working in marine environment. It is mainly composed of a ring-shaped horizontal curved surface plate 1 with a designed shape and a cylindrical pile with a triangular rib plate.

[0029] The ring-shaped curved surface plate 1 is curved in the diameter direction and the circumferential direction, and has a certain arc, which is calculated by the following curved surface equation.

[0030]

[0031] Wherein the curved surface control parameters a n , b n , c nThe values of the control parameters of the 12 curved surface equations are different for different incident wave frequencies. In actual marine engineering, the frequency of sea waves is about 0.1 Hz-1 Hz. In this embodiment, the incident wave frequency is taken as 0.7 Hz, which is a common sea wave frequency in actual engineering, and the control parameters of the 12 curved surface equations are as follows:

[0032] a1=0.00405524905486886, a2=-0.00372424304670124,

[0033] a3=0.00370228038998520, a4=-0.000867769514806148

[0034] b1=0.00312701865564095, b2=0.0176812315247391

[0035] b3=-0.0252935771472117, b4=0.00426578109644089

[0036] c1=-0.00937797589173304, c2=-0.0244105638645872

[0037] c3=-0.00540824684608461, c4=-0.00692238081105743

[0038] According to the simulation calculation results, the installation depth of the annular curved surface plate near the water surface is the best for suppressing the wave load, the installation depth of the horizontal curved surface plate is d, the distance from the water surface is 1 / 10h-1 / 8h, wherein h is the submergence depth of the single pile foundation, and r and theta are polar coordinate parameters of the curved surface control equation.

[0039] The annular curved surface plate and the cylindrical pile are connected as a whole, and the cylindrical pile mainly functions to facilitate the connection of the annular curved surface plate and the single pile foundation. Therefore, the inner surface contour shape of the cylindrical pile should be consistent with the peripheral contour shape of the single pile foundation. That is, if the single pile foundation is a cylindrical shape, the inner surface contour of the curved surface plate and the pile should also be circular; if the single pile foundation is an elliptical column, the inner surface of the annular curved surface plate and the pile should also be elliptical.

[0040] The outer diameter of the annular curved surface plate is 1.5D-1.8D, D is the diameter of the single pile foundation, and the thickness of the annular curved surface plate is 0.1-0.125 of the design wave height.

[0041] The height of the pile should exceed the curved surface plate by a certain height l, l is 1 / 6-1 / 5 of the diameter D of the single pile foundation.

[0042] The rib plate should be arranged between the annular curved flat plate and the cylinder, and it should be noted that other support components can also be used in the above embodiment. The main function of the triangular rib plate is to provide a certain rigidity and strength for the curved flat plate, so as to avoid large deformation or even damage of the curved flat plate under the action of actual waves, and at the same time, the stress concentration effect of the connection between the curved flat plate and the cylinder can be reduced, the strength and stability of the whole component are further enhanced, the safety of the structure is ensured, and one rib plate is preferably arranged every 30° along the circumference. Other support structures capable of playing the same role in the prior art can be applied to the method.

[0043] When the offshore wind power single pile foundation wave load suppression method is used, the annular curved flat plate and the support component cylindrical cylinder should adopt an integral structure, and the material is preferably steel or other metal or concrete. The prefabricated installation method can be used, and the curved flat plate can be divided into several parts for convenient assembly according to the actual situation.

Claims

1. A wave load suppressing structure for an offshore wind power monopile foundation, characterized by, A ring-shaped horizontal curved panel is fixedly installed on the single-pile foundation, the ring-shaped horizontal curved panel is a curve along the diameter direction and the circumferential direction, and the shape of the ring-shaped horizontal curved panel is controlled by a curved surface equation as shown in the following formula, ， The 12 selected curved surface equation control parameters are as follows: 0.00405524905486886， -0.00372424304670124， 0.00370228038998520， -0.000867769514806148， 0.00312701865564095， 0.0176812315247391， -0.0252935771472117， 0.00426578109644089， -0.00937797589173304， -0.0244105638645872， -0.00540824684608461， -0.00692238081105743； wherein is the horizontal curved panel installation depth, is the distance from the water surface 0.1 -0.125 wherein is the single pile foundation submersion depth, and is the polar coordinate parameter of the curved surface control equation.

2. A wave load suppressing structure for an offshore wind power monopile foundation according to claim 1, characterized in that: The inner diameter of the annular horizontal curved panel is the same as the outer diameter of the single pile foundation, and the outer diameter of the annular horizontal curved panel is 1.5 -1.8 , is the diameter of the single pile foundation, and the thickness of the annular horizontal curved panel is 0.1-0.125 of the design wave height.

3. A wave load suppressing structure for an offshore wind power monopile foundation according to claim 2, characterized in that: Also include the casing, casing should exceed the curved panel a certain height , The diameter of the single pile foundation is 1 / 6-1 / 5 The annular horizontal curved panel is fixedly connected with the single pile foundation through the casing, a plurality of groups of reinforcing rib plates are fixedly connected along the circumference between the annular horizontal curved panel and the casing, and the reinforcing rib plates are located on the upper plane and the lower plane of the annular horizontal curved panel.

4. A wave load suppressing structure for an offshore wind power monopile foundation according to claim 3, characterized in that: The rib plate is arranged every 30° along the circumference.

5. A wave load suppressing structure for an offshore wind power monopile foundation according to claim 4, characterized in that: The rib plate is a right-angled triangular rib plate.

Images