WO2022252410A1

WO2022252410A1 - Multigrid belt structure-based anti-scour system and method for offshore wind turbine foundation

Info

Publication number: WO2022252410A1
Application number: PCT/CN2021/114654
Authority: WO
Inventors: 张庆; 张立英; 郭辰; 李芊; 邵振州
Original assignee: 中国华能集团清洁能源技术研究院有限公司
Priority date: 2021-06-04
Filing date: 2021-08-26
Publication date: 2022-12-08
Also published as: CN113202060A

Abstract

The present application provides a multigrid belt structure-based anti-scour system and method for an offshore wind turbine foundation. The system comprises several grid belts; each grid belt comprises a plurality of grid layers; each grid layer is composed of several grid units; each grid unit is formed by enclosing a plurality of grids; each grid is vertically fixed between two vertical posts by means of a connecting device. In the present application, by means of the grids, the flow rate of water is reduced, and the flow of silt close to the bottom layer of the seabed is blocked, so as to finally achieve the purpose of the anti-scouring of the foundation; the multigrid structure enhances the flow blocking rigidity of the grids, and a foundation anti-scour effect in a sea current environment having a variable flow direction can be provided; the arrangements of multiple grid belts further enhance the anti-scour effect of an underwater foundation.

Description

An anti-scouring system and method for an offshore wind power foundation with a multi-layer grid strip structure

technical field

The application belongs to the technical field of wind power generation, and in particular relates to an anti-scouring system and method for an offshore wind power foundation with a multi-layer grid strip structure.

Background technique

The surroundings of offshore wind power foundations are easily affected by seabed currents to form scour pits, which reduces the buried depth of the foundation and affects the safe and stable operation of wind turbines. At present, the anti-scouring measures for offshore wind power foundations are divided into active protection and passive protection. Active protection generally achieves the purpose of anti-scouring by reducing the flow rate of water in the protection area, such as the protection of the front deflector of the foundation. Passive protection is to improve the anti-scouring ability by laying a protective layer within the foundation range, such as laying stones, concrete blocks, sandbags, concrete hinge rows, etc. in the protection area. Conventional anti-scour measures for offshore wind power foundations generally have the problems of high construction costs and general protection effects.

Contents of the invention

In order to solve the above technical problems, this application aims to provide an anti-scour system and method for an offshore wind power foundation with a multi-layer grid strip structure, which can reduce the water flow velocity in the protection area, block the flow of sediment, and achieve the purpose of anti-scour of the foundation. Purpose.

In order to achieve the above object, the application adopts the following technical solutions:

An anti-scour system for offshore wind power foundations with a multi-layer grid strip structure, including several grid strips; each grid strip includes multi-layer grid layers, and each grid layer is composed of several grid units; each The grid unit is surrounded by several grids;

Each grid is vertically fixed between two columns through a connecting device.

The further improvement of the present application is that: the grid is made of corrosion-resistant metal or fiber; the porosity of the grid is 20% to 50%.

The further improvement of the present application lies in that: the upright column is a corrosion-resistant metal cylinder, which can be buried in the seabed.

The further improvement of the present application is that: the connection device is a corrosion-resistant metal connector; the side wall of the connection device is provided with several wedges; the grid is installed in the wedges of the corresponding connection device.

The further improvement of the present application lies in that: the cross-sectional shape of the connection device is square or circular; the center of the connection device is provided with a through hole; and the column is installed in the through hole.

A further improvement of the present application lies in that the section of the wedge is rectangular or trapezoidal.

The further improvement of the present application is that one or more grid strips are arranged in front of the foundation of the offshore wind power along the dominant flow direction of the bottom water flow.

The further improvement of the present application lies in that the plurality of grid strips are arranged in a manner of non-equal spacing, and the interval between adjacent layers along the main flow direction increases gradually.

The further improvement of the present application lies in: including three grid strips, each grid strip has a width of L, the distance between the first grid and the second grid strip along the water flow direction is L1, the second grid strip and the second grid strip The distance between the three grid strips along the water flow direction is L2, satisfying L2≥L1≥L.

A method for anti-scouring of an offshore wind power foundation with a multi-layer grid strip structure, comprising the following steps:

In front of the offshore wind power foundation, arrange one or more grid strips along the dominant flow direction of the bottom water flow;

Through the multi-layer grids in the grid belt, the water flow velocity is reduced, the sediment flow close to the bottom of the seabed is blocked, and the erosion of the offshore wind power foundation by the sediment flow is reduced.

Compared with the prior art, the present application has the following advantages:

In this application, the grille is used to reduce the velocity of the water flow, block the flow of sediment close to the bottom of the seabed, and finally achieve the purpose of anti-scouring of the foundation.

The application uses a multi-layer grid structure to strengthen the rigidity of the grille blocking flow, and can provide basic anti-scour effect in the environment of variable flow direction.

This application further enhances the anti-scouring effect of the underwater foundation through the arrangement of multiple grid strips.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application. In the attached picture:

FIG. 1 is a schematic diagram of the overall structure of an offshore wind power foundation anti-scouring system with a multi-layer grid strip structure in the present application.

Fig. 2 is a schematic cross-sectional view of a connecting device of an offshore wind power foundation anti-scouring system with a multi-layer grid strip structure of the present application.

Fig. 3 is a schematic cross-sectional view of another connection device of an offshore wind power foundation anti-scouring system with a multi-layer mesh band structure in the present application.

Fig. 4 is a schematic diagram of the arrangement of multiple grid belts of an offshore wind power foundation scour prevention system with a multi-layer grid belt structure in the present application.

Detailed ways

The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

The following detailed descriptions are all exemplary descriptions, and are intended to provide further detailed descriptions of the present application. Unless otherwise specified, all technical terms used in the application have the same meaning as commonly understood by those of ordinary skill in the art to which the application belongs. Terms used in the present application are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present application.

Example 1

Please refer to Fig. 1 , a kind of anti-scour system for offshore wind power foundation with multi-layer grid belt structure, including several grid belts 100; each grid belt 100 includes multi-layer grid layers 101, each layer of grid layers Composed of several grid units 102; each grid unit is surrounded by several grids 1;

Each grid 1 is vertically fixed between two columns 2 through a connecting device 3 ; a closed space surrounded by several grids 1 is a grid unit 102 .

The grid 1 is made of corrosion-resistant metal material or high-strength fiber material, and its porosity is 20% to 50%.

Column 2 is a corrosion-resistant metal cylinder, which is embedded in the seabed and fixed, and its cross section can be circular, square or other shapes.

Please refer to Fig. 2 and shown in Fig. 3, the connection device 3 is a corrosion-resistant metal connector, the cross-sectional shape is a square or a circle with a wedge 31, and the center of the connection device 3 is provided with a through hole 30; The cross-sectional shape is consistent with the cross-sectional shape of the column 2 . The column 2 is in interference fit with the through hole 30 . The wedge 31 has a rectangular or trapezoidal cross-section; if it is set as a trapezoid, it can cooperate and interlock with the trapezoid on the edge of the grid 1 to prevent the grid 1 from being separated from the connecting device 3 under force.

The grid unit connects the grid 1 as a whole through the connection device 3 and is fixed on the seabed through the column 2 .

Grid cells, the grid cross-section can be square, rectangular, hexagonal or other shapes.

The length, width and height of the grid strip can be spliced and adjusted depending on the speed of the seabed water flow and the space environment.

One or more grid strips can be arranged in front of the underwater foundation of the fan and along the dominant flow direction of the bottom water flow.

Example 2

For grid belts, multiple arrangements can be arranged at non-equal intervals, and the interval between adjacent layers along the main flow direction gradually increases.

Please refer to Figure 4, a multi-layer grid strip structure anti-scour system for offshore wind power foundations, using three grid strips, each grid strip width is L, the first grid strip and the second grid strip The distance along the water flow direction is L1, and the distance between the second grid strip and the third grid strip along the water flow direction is L2, which satisfies the relationship L2≥L1≥L. The reason for this embodiment is that when the ocean current velocity is too large , one layer of grille belt can not play the role of anti-scouring, at this time, multi-layer grille belt is needed to improve the deceleration effect of the ocean current and the retardation effect of the sediment in it.

Example 3

The present application also provides an anti-scouring method for an offshore wind power foundation with a multi-layer grid band structure, based on the anti-scour system for an offshore wind power base with a multi-layer grid band structure in Embodiment 1 or Example 2, comprising the following steps :

In front of the offshore wind power foundation, one or more grid strips are arranged along the dominant flow direction of the bottom water flow; through the multi-layer grids in the grid strips, the flow velocity of the water flow is reduced, the flow of sediment close to the bottom of the seabed is blocked, and the sediment flow is reduced. The erosion of sand flow on the foundation of offshore wind power.

Specifically, in each grille strip:

Step 1. The seawater flows through the first grid unit of the grid belt, the sediment in the seawater is blocked by the grid 1 in the first grid unit, and the seawater and the grid 1 in the first grid unit Collision velocity reduction;

Step 2. The seawater passing through the grid units of the first layer needs to flow through the grid units of the second layer of the grid belt, the sediment in the seawater is blocked by the grid 1 in the grid units of the second layer, and the seawater and the second layer of grid units The grid 1 collision velocity in the layer mesh unit is reduced a second time;

Step 3. The seawater passing through the grid units of the second layer needs to flow through the grid units of the third layer of the grid belt, the sediment in the seawater is blocked by the grid 1 in the grid units of the third layer, and the seawater and the third layer of grid units The grid 1 collision velocity in the layer mesh unit is reduced for the third time.

It can be known from common technical knowledge that this application can be implemented through other implementations without departing from its spirit or essential features. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the present application or within the scope equivalent to the present application are embraced by the present application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present application can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present application shall fall within the protection scope of the claims of the present application.

Claims

An anti-scouring system for offshore wind power foundations with a multi-layer grid band structure, characterized in that it includes several grid bands (100); each grid band (100) includes a multi-layer grid layer (101), each The grid layer (101) is composed of several grid units (102); each grid unit (102) is surrounded by several grids (1);

Each grid (1) is vertically fixed between two columns (2) through a connecting device (3).
The anti-scouring system for offshore wind power foundations with a multi-layer grid strip structure according to claim 1, wherein the grid (1) is made of corrosion-resistant metal or fiber; the porosity of the grid (1) is 20% to 50%.
The anti-scour system for offshore wind power foundations with a multi-layer grid strip structure according to claim 1, wherein the column (2) is a corrosion-resistant metal column that can be embedded in the seabed.
The anti-scouring system for offshore wind power foundations with a multi-layer grid strip structure according to claim 1, wherein the connection device (3) is a corrosion-resistant metal connector; the side wall of the connection device (3) is provided with There are several wedges (31); the grid (1) is installed in the wedges (31) of the corresponding connecting device (3).
According to claim 4, the anti-scouring system of offshore wind power foundation with multi-layer grid strip structure is characterized in that, the cross-sectional shape of the connection device (3) is square or circular; the center of the connection device (3) is provided with a through hole (30); the column (2) is installed in the through hole (30).
The anti-scour system for offshore wind power foundations with a multi-layer grid strip structure according to claim 4, characterized in that the cross section of the wedge (31) is rectangular or trapezoidal.
The anti-scouring system for offshore wind power foundations with a multi-layer grid strip structure according to claim 1, wherein one or more grid strips (100) are arranged in front of the offshore wind power foundations along the dominant flow direction of bottom water flow .
The anti-scour system for offshore wind power foundations with a multi-layer grid strip structure according to claim 7, wherein the plurality of grid strips (100) are arranged at non-equal intervals, and the adjacent layers along the main flow direction are spaced apart Gradually increase.
The anti-scour system for offshore wind power foundations with a multi-layer grid strip structure according to claim 7, is characterized in that it includes three grid strips, each grid strip has a width of L, the first grid and the second grid The spacing between the grid strips along the water flow direction is L1, and the spacing between the second grid strip and the third grid strip along the water flow direction is L2, satisfying L2≥L1≥L.
A method for anti-scouring of an offshore wind power foundation with a multi-layer grid band structure, characterized in that the anti-scour method for an offshore wind power base with a multi-layer grid band structure according to any one of claims 1 to 9 system, including the following steps:

In front of the offshore wind power foundation, one or more grid strips (100) are arranged along the dominant flow direction of the bottom water flow;

Through the multi-layer grids (1) in the grid belt, the velocity of the water flow is reduced, the flow of sediment close to the bottom of the seabed is blocked, and the erosion of the offshore wind power foundation by the flow of sediment is reduced.