A construction method for wind turbine foundation lightning protection grounding network based on aluminum stranded wire

Abstract

The present invention discloses a construction method of a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire, comprising the following steps: excavating a first grounding ring installation channel and a second grounding ring installation channel concentric with the anchor cage on the periphery of the steel cage of the wind turbine foundation; using the aluminum stranded wire to respectively make an inner grounding ring and an outer grounding ring, and installing the inner grounding ring in the first grounding ring installation channel, and installing the outer grounding ring in the second grounding ring installation channel; leading out four aluminum stranded wires from four equally divided points on the inner grounding ring, so that one end of each aluminum stranded wire extends inwardly and is fixed to a voltage-equalizing ring, and the other end extends to an external wind farm road through the outer grounding ring; fixing each aluminum stranded wire at the intersection of the inner grounding ring and the outer grounding ring with a special connecting device; arranging vertical grounding electrodes on the outer grounding ring to form a hybrid grounding network; using the aluminum stranded wire instead of flat steel, the method can be applied to the lightning protection grounding network for wind turbine foundations in mountainous wind farms with complex terrain.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power new energy construction, and more specifically, relates to a method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire. Background Art

[0002] Wind power generation is an important clean energy source. With its clean, renewable and pollution-free characteristics, the demand for wind power installation continues to increase, and its development prospects become broader.

[0003] Lightning discharge, as an outburst of powerful natural force, can bring disasters to many ground facilities. The wind turbine structure standing in the wind farm is a typical high structure and is more susceptible to lightning strikes. Therefore, the wind turbine is generally equipped with an underground wind turbine grounding device to conduct the lightning received by the wind turbine to the ground.

[0004] Currently, lightning protection grounding for wind turbine foundations typically utilizes 6-meter-long galvanized flat steel welded together, with the welds protected by anti-corrosion paint. During construction, electric welders and diesel generators must be prepared on the wind turbine platform. Due to the numerous welding locations, moving the construction equipment is cumbersome. When galvanized flat steel is overlapped, welds are prone to slag inclusions, undercuts, cracks, and pores. Furthermore, the limited contact area makes the joints susceptible to corrosion and rust. These issues not only affect electrical conductivity, reduce construction efficiency, and increase costs, but also significantly impact the effectiveness of the lightning protection grounding for the wind turbine foundation, posing a potential safety hazard.

[0005] Therefore, there is an urgent need for a wind turbine foundation lightning protection grounding network and its construction method that is circular in shape and extends to the wind farm road, can avoid the corrosion of flat steel overlap welds and the impact on conductive performance, has high construction safety, and can be applied to mountain wind farms with complex terrain. Summary of the Invention

[0006] In response to the above defects or improvement needs of the prior art, the present invention provides a construction method for a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire. According to the design scheme of the lightning protection grounding network for the wind turbine foundation, aluminum stranded wire is used instead of flat steel to form a ring grid and longitudinal extension arrangement; the aluminum stranded wire is in the form of a whole coil, and during the construction process of the peripheral grounding and extended grounding of the wind turbine foundation, it has the convenience of being circular as a whole and extending to the wind farm road, avoiding the continuous overlapping of flat steel; avoiding the traditional arc welding to damage the galvanized layer at the flat steel joint, reducing the corrosion of the welds and the impact on the conductive performance when the galvanized flat steel is overlapped; the present invention can be applied to mountainous wind farms with complex terrain, can simplify the construction process, can better ensure the lightning protection grounding effect of the wind turbine foundation, improve construction efficiency, reduce construction costs, has stronger applicability, and meets the requirements of green construction; it can solve the problems of traditional flat steel welding construction with many welding positions, cumbersome movement of construction equipment, and easy corrosion and rust at the connection parts of the galvanized flat steel when overlapping, which affects conductivity, reduces construction efficiency, increases construction costs, has a greater impact on the lightning protection grounding effect of the wind turbine foundation, and causes certain safety hazards.

[0007] In order to achieve the above object, the present invention provides a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire, comprising the following steps:

[0008] S1: Install the anchor cage, tie steel bars around the outer periphery of the anchor cage to form a wind turbine foundation steel cage, and install a pressure equalizing ring inside the anchor cage;

[0009] S2: excavating a first grounding ring installation channel and a second grounding ring installation channel of different diameters, which are concentric with the anchor cage, on the periphery of the wind turbine foundation reinforcement cage;

[0010] S3: Using aluminum stranded wire, respectively, make an inner grounding ring that matches the diameter of the first grounding ring installation ring and an outer grounding ring that matches the diameter of the second grounding ring installation ring, and install the inner grounding ring in the first grounding ring installation ring and the outer grounding ring in the second grounding ring installation ring;

[0011] S4: Lead out four aluminum strands from four equally divided points on the inner grounding ring, with one end of each aluminum strand extending inward to be fixed to the equalizing ring inside the wind turbine foundation steel cage and anchor cage, and the other end extending in the direction of the outer grounding ring, passing through the outer grounding ring, and continuing to extend toward the external wind farm road;

[0012] S5: Install connecting devices at the intersection of each aluminum stranded wire and the inner grounding ring and at the intersection of each aluminum stranded wire and the outer grounding ring for fixing;

[0013] S6: Multiple vertical grounding electrodes perpendicular to the ground are evenly arranged on the outer grounding ring to form a hybrid grounding network around the wind turbine foundation steel cage, which is mainly composed of an equalizing ring, an inner grounding ring, and an outer grounding ring, and supplemented by multiple vertical grounding electrodes.

[0014] Furthermore, the diameter of the second grounding ring installation track in step S2 is greater than the diameter of the first grounding ring installation track;

[0015] The depth of the first grounding ring installation channel and the second grounding ring installation channel shall not be less than 800 mm.

[0016] Furthermore, in step S3, the diameters of the inner grounding ring and the outer grounding ring are both larger than the diameter of the wind turbine foundation reinforcement cage and are both concentric with the anchor cage;

[0017] The buried depth of the inner grounding ring and the outer grounding ring is not less than 800 mm.

[0018] Furthermore, in step S4, adjacent aluminum strands of the four aluminum strands are perpendicular to each other and point to the center of the anchor cage respectively; and the buried depth of the four aluminum strands is not less than 800 mm.

[0019] Furthermore, the connecting device in step S5 includes a first connecting block and a second connecting block that can be assembled;

[0020] The first connecting block includes a first fixing ear, a first semi-arc plate, a second semi-arc plate and a second fixing ear which are sequentially connected from top to bottom and integrally formed;

[0021] The second connecting block includes a third fixing ear, a third semi-arc plate, a fourth semi-arc plate and a fourth fixing ear that are sequentially connected from top to bottom and integrally formed.

[0022] When the first connecting block and the second connecting block are assembled, the first fixing ear and the third fixing ear are fitted together, the second fixing ear and the fourth fixing ear are fitted together, the first semi-arc plate and the third semi-arc plate are buckled together to form a first circular hole, and the second semi-arc plate and the fourth semi-arc plate are buckled together to form a second circular hole.

[0023] Furthermore, the central axes of the first circular hole and the second circular hole are not in the same plane and are perpendicular to each other.

[0024] Furthermore, the first fixing ear, the second fixing ear, the third fixing ear and the fourth fixing ear are all provided with retaining bolt holes;

[0025] The bolt holes on the first fixing ear and the third fixing ear are positioned to match;

[0026] The bolt holes on the second fixing ear and the fourth fixing ear are positioned to match each other.

[0027] Furthermore, the bottom of the inner grounding ring and the first grounding ring mounting track, and the bottom of the outer grounding ring and the second grounding ring mounting track are respectively fixed by a plurality of fixing devices;

[0028] The fixing device includes a first fixing plate and a second fixing plate arranged in parallel and spaced apart, and a semicircular plate arranged between the first fixing plate and the second fixing plate; the first fixing plate and the second fixing plate are respectively provided with mounting holes.

[0029] Furthermore, the first fixing plate, the semicircular plate and the second fixing plate are integrally formed.

[0030] Furthermore, in step S6, the vertical grounding electrode and the outer grounding ring are connected with a copper braided wire through the middle bolt hole.

[0031] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0032] (1) The present invention provides a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire. According to the design scheme of the lightning protection grounding network for the wind turbine foundation, aluminum stranded wire is used instead of flat steel to form a circular grid and longitudinal extension arrangement. The aluminum stranded wire is in the form of a coiled whole root. During the construction process of the peripheral grounding and extended grounding of the wind turbine foundation, it has the convenience of being circular as a whole and extending to the wind farm road, thus avoiding the continuous overlapping of the flat steel. The use of aluminum stranded wire avoids the damage of the galvanized layer at the joint by traditional arc welding, reduces the corrosion of the welds when the galvanized flat steel is overlapped, and reduces the influence on the conductive performance. The present invention has high construction safety, and can solve the problems of traditional flat steel welding construction having many welding positions, cumbersome movement of construction equipment, and easy corrosion and rusting of the connection parts of the galvanized flat steel when overlapping, which affects the conductivity, reduces the construction efficiency, increases the construction cost, and has a greater impact on the lightning protection grounding effect of the wind turbine foundation, thus causing certain safety hazards.

[0033] (2) The invention provides a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire. The method adopts a whole roll of steel core aluminum stranded wire and cuts it according to the required length. There is no intermediate joint in the process, and the construction is simple. Moreover, the round aluminum stranded wire has a better wrapping and contact area with the soil than the galvanized flat iron. Since the geological conditions of mountain wind farms are relatively hard, it is difficult to dig the grounding trench. In some places, it is difficult to dig to the same depth and flatness. It is not convenient to lay and install the rigid galvanized flat iron, but the flexible aluminum stranded wire can be smoothly extended. Therefore, the aluminum stranded wire is used instead of the galvanized flat steel. It has good flexibility, a small bending radius, and is easy to turn. It is suitable for mountain wind farms with complex terrain, can simplify the construction process, reduce construction costs, and has stronger applicability.

[0034] (3) The invention provides a method for constructing a lightning protection grounding grid for a wind turbine foundation based on aluminum stranded wires. By designing a special connection fixture at two vertically intersecting aluminum stranded wires, a lap connection is made between the aluminum stranded wire grounding grids, thereby ensuring the simplicity of construction and the firmness of the connection.

[0035] (4) The present invention provides a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wires. For the aluminum stranded wires that are parallel-jointed and connected to the vertical grounding electrodes, a simple fixing device consisting of two fixing plates and a semicircular plate is used to connect and fix them, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire according to an embodiment of the present invention;

[0037] Figure 2 A schematic structural diagram of a wind turbine foundation lightning protection grounding network construction method based on aluminum stranded wires according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the three-dimensional structure of a fixing device for a construction method of a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to an embodiment of the present invention;

[0039] Figure 4 This is a side structural schematic diagram of a fixing device for a construction method of a wind turbine foundation lightning protection grounding network based on aluminum stranded wires according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic top view of the structure of a fixing device for a construction method of a wind turbine foundation lightning protection grounding network based on aluminum stranded wires according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the three-dimensional structure of a connection device for a construction method of a wind turbine foundation lightning protection grounding network based on aluminum stranded wires according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the three-dimensional structure of the second connecting block (or first connecting block) of the connecting device of a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire according to an embodiment of the present invention;

[0043] Figure 8 This is a front structural schematic diagram of a second connecting block (or first connecting block) of a connecting device for a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wires according to an embodiment of the present invention;

[0044] Figure 9 This is a rear structural schematic diagram of a second connecting block (or first connecting block) of a connecting device for a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wires according to an embodiment of the present invention;

[0045] Figure 10 This is a schematic top view of the structure of the second connecting block (or first connecting block) of the connecting device of a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wires according to an embodiment of the present invention.

[0046] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-anchor cage, 2-equalizing ring, 3-inner grounding ring, 4-outer grounding ring, 5-connecting device, 51-first connecting block, 501-first fixing ear, 502-first semi-arc plate, 503-second semi-arc plate, 504-second fixing ear, 52-second connecting block, 505-third fixing ear, 506-third semi-arc plate, 507-fourth semi-arc plate, 508-fourth fixing ear, 509-first circular hole, 510-second circular hole, 511-second circular hole, 1-retaining bolt hole, 6-vertical grounding electrode, 101-first aluminum stranded wire, 102-second aluminum stranded wire, 103-third aluminum stranded wire, 104-fourth aluminum stranded wire, 301-first intersection, 302-second intersection, 303-third intersection, 304-fourth intersection, 305-fifth intersection, 306-sixth intersection, 307-seventh intersection, 308-eighth intersection, 400-fixing device, 401-first fixing plate, 402-second fixing plate, 403-semicircular plate, 404-mounting hole. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, when an element is referred to as being "fixed on", "set on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected", and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, it may be a connection between the internal parts of the two elements or an interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referenced. Thus, features identified with "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0050] Currently, lightning protection grounding for wind turbine foundations typically utilizes 6-meter-long galvanized flat steel welded together, with the welds protected by anti-corrosion paint. During construction, electric welders and diesel generators must be prepared on the wind turbine platform. Due to the numerous welding locations, moving the construction equipment is cumbersome. When galvanized flat steel is overlapped, welds are prone to slag inclusions, undercuts, cracks, and pores. Furthermore, the limited contact area makes the joints susceptible to corrosion and rust. These issues not only affect electrical conductivity, reduce construction efficiency, and increase costs, but also significantly impact the effectiveness of the lightning protection grounding for the wind turbine foundation, posing a potential safety hazard.

[0051] Based on the above reasons, if Figure 1 and Figure 2 As shown, the present invention provides a method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire, using aluminum stranded wire instead of flat steel. The specific construction includes the following steps:

[0052] S1: Install the anchor cage 1, tie steel bars around the outer periphery of the anchor cage 1 to form a wind turbine foundation steel cage, and install the equalizing ring 2 inside the anchor cage 1;

[0053] S2: excavating a first grounding ring installation channel and a second grounding ring installation channel of different diameters, which are concentric with the anchor cage 1, respectively, on the periphery of the wind turbine foundation steel cage;

[0054] S3: Using aluminum stranded wire, respectively make an inner grounding ring 3 that matches the diameter of the first grounding ring installation ring and an outer grounding ring 4 that matches the diameter of the second grounding ring installation ring, and install the inner grounding ring 3 in the first grounding ring installation ring and the outer grounding ring 4 in the second grounding ring installation ring;

[0055] S4: Lead out four aluminum strands from four equally divided points on the inner grounding ring, so that one end of each aluminum strand extends inward and is fixed to the equalizing ring 2 inside the wind turbine foundation steel cage and anchor cage 1, and the other end extends in the direction of the outer grounding ring 4, passes through the outer grounding ring 4, and continues to extend to the external wind farm road;

[0056] S5: Install connecting devices 5 at the intersection of each aluminum stranded wire and the inner grounding ring 3 and at the intersection of each aluminum stranded wire and the outer grounding ring 4 for fixing;

[0057] S6: Multiple vertical grounding electrodes 6 perpendicular to the ground are evenly arranged on the external grounding ring 4 to form a hybrid grounding network around the wind turbine foundation steel cage, which is mainly composed of an equalizing ring 2, an internal grounding ring 3, and an external grounding ring 4, and supplemented by multiple vertical grounding electrodes 6; the number of the vertical grounding electrodes 6 on the external grounding ring 4 is preferably 8; the vertical grounding electrodes 6 and the external grounding ring 4 are connected with copper braided wires through the middle bolt holes.

[0058] Furthermore, if Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the diameter of the second grounding ring installation channel in step S2 is greater than the diameter of the first grounding ring installation channel; the depth of the first grounding ring installation channel and the second grounding ring installation channel is not less than 800 mm.

[0059] Furthermore, if Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the diameters of the inner grounding ring 3 and the outer grounding ring 4 in step S3 are both larger than the diameter of the wind turbine foundation steel cage and are both concentric with the anchor cage 1; in an embodiment of the present invention, the diameter of the inner grounding ring 3 is 20m; the diameter of the outer grounding ring 4 is 35m; the buried depths of the inner grounding ring 3 and the outer grounding ring 4 are both not less than 800mm; the bottom of the inner grounding ring 3 and the first grounding ring installation ringway, and the bottom of the outer grounding ring 4 and the second grounding ring installation ringway are respectively fixed by a plurality of fixing devices 400;

[0060] Furthermore, if Figure 3-Figure 5 As shown, the fixing device 400 includes a first fixing plate 401 and a second fixing plate 402 arranged in parallel and spaced apart, and a semicircular plate 403 arranged between the first fixing plate 401 and the second fixing plate 402; the first fixing plate 401, the semicircular plate 403 and the second fixing plate 402 are made of an integral mold; the first fixing plate 401 and the second fixing plate 402 are provided with mounting holes 404; by buckling the semicircular plate 403 on the aluminum stranded wire of the inner grounding ring 3 and the outer grounding ring 4, and by installing bolts on the mounting holes 404 of the first fixing plate 401 and the second fixing plate 402, the inner grounding ring 3 and the bottom of the first grounding ring mounting ring channel, and the outer grounding ring 4 and the bottom of the second grounding ring mounting ring channel are fixed.

[0061] Furthermore, if Figure 2 As shown, in the embodiment of the present invention, in step S4, the adjacent aluminum strands of the four aluminum strands are perpendicular to each other; Figure 1The four aluminum strands are the first aluminum strand 101, the second aluminum strand 102, the third aluminum strand 103, and the fourth aluminum strand 104; the four aluminum strands point to the center of the anchor cage 1 respectively; to ensure the grounding effect, the external aluminum strand in each direction is as long as possible and the buried depth is not less than 800mm; the four aluminum strands and the equalizing ring 2 can be fixed by welding.

[0062] Furthermore, if Figure 2 As shown, in the embodiment of the present invention, the intersection position of the four aluminum strands and the inner grounding ring 3 in step S5 is Figure 1 The intersections of the four aluminum strands and the outer ground ring 4 are at Figure 1 The fifth intersection 305, the sixth intersection 306, the seventh intersection 307 and the eighth intersection 308 are respectively provided with the connecting devices 5; the first intersection 301, the second intersection 302, the third intersection 303, the fourth intersection 304, the fifth intersection 305, the sixth intersection 306, the seventh intersection 307 and the eighth intersection 308 are respectively provided with the connecting devices 5.

[0063] Furthermore, if Figures 6-10As shown, in an embodiment of the present invention, the connecting device 5 in step S5 includes a first connecting block 51 and a second connecting block 52 that can be assembled; the first connecting block 51 includes a first fixing ear 501, a first semi-arc plate 502, a second semi-arc plate 503 and a second fixing ear 504 that are sequentially connected and integrally formed from top to bottom; the second connecting block 52 includes a third fixing ear 505, a third semi-arc plate 506, a fourth semi-arc plate 507 and a fourth fixing ear 508 that are sequentially connected and integrally formed from top to bottom; the first fixing ear 501, the second fixing ear 504, the third fixing ear 505 and the fourth fixing ear 508 have the same structure, all of which are rectangular plate structures; the first semi-arc plate 502 and the second semi-arc plate 503, the third semi-arc plate 506 and the fourth semi-arc plate 507 have the same structure, all of which are semi-arc plate structures; when the first connecting block 51 and the second connecting block 52 are assembled, the first fixing ear 5 01 and the third fixing ear 505 are fitted together, the second fixing ear 504 and the fourth fixing ear 508 are fitted together, the first semi-arc plate 502 and the third semi-arc plate 506 are buckled together to form a first circular hole 509, and the second semi-arc plate 503 and the fourth semi-arc plate 507 are buckled together to form a second circular hole 510; the central axes of the first circular hole 509 and the second circular hole 510 are not in the same plane and are perpendicular to each other; the first circular hole and the second circular hole are used for two aluminum stranded wires perpendicular to each other on different horizontal planes to pass through respectively; the first fixing ear 501, the second fixing ear 504, the third fixing ear 505 and the fourth fixing ear 508 are all provided with a retaining bolt hole 511; the positions of the bolt holes on the first fixing ear 501 and the third fixing ear 505 are adapted; the positions of the bolt holes on the second fixing ear 504 and the fourth fixing ear 508 are adapted; the two aluminum stranded wires perpendicular to each other on different horizontal planes are fixed by the connecting device 5, the structure is simple, and the installation is convenient.

[0064] The present invention provides a method for constructing a lightning protection grounding grid for a wind turbine foundation based on aluminum stranded wire. According to the design scheme of the lightning protection grounding grid for the wind turbine foundation, aluminum stranded wire is used instead of flat steel to form a circular grid and a longitudinally extended arrangement. The use of aluminum stranded wire avoids the traditional arc welding from damaging the galvanized layer at the joint, and reduces the corrosion of the welds and the impact on the conductive performance when the galvanized flat steel is overlapped. The present invention has high construction safety and can solve the problems of traditional flat steel welding construction with a large number of welding positions, cumbersome movement of construction equipment, and easy corrosion and rust at the connection parts of the galvanized flat steel when overlapping, which affects conductivity, reduces construction efficiency, increases construction costs, and has a greater impact on the lightning protection grounding effect of the wind turbine foundation, causing certain safety hazards.

[0065] It will be easily understood by those skilled in the art that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire, characterized by: The steps include: S1: Install the anchor cage, tie steel bars around the outer periphery of the anchor cage to form a wind turbine foundation steel cage, and install a pressure equalizing ring inside the anchor cage; S2: excavating a first grounding ring installation channel and a second grounding ring installation channel of different diameters, which are concentric with the anchor cage, on the periphery of the wind turbine foundation reinforcement cage; S3: Using aluminum stranded wire, respectively, make an inner grounding ring that matches the diameter of the first grounding ring installation ring and an outer grounding ring that matches the diameter of the second grounding ring installation ring, and install the inner grounding ring in the first grounding ring installation ring and the outer grounding ring in the second grounding ring installation ring; S4: Lead out four aluminum strands from four equally divided points on the inner grounding ring, with one end of each aluminum strand extending inward to be fixed to the equalizing ring inside the wind turbine foundation steel cage and anchor cage, and the other end extending in the direction of the outer grounding ring, passing through the outer grounding ring, and continuing to extend toward the external wind farm road; S5: Install connecting devices at the intersection of each aluminum stranded wire and the inner grounding ring and at the intersection of each aluminum stranded wire and the outer grounding ring for fixing; S6: evenly arranging multiple vertical grounding electrodes perpendicular to the ground on the outer grounding ring to form a hybrid grounding network around the wind turbine foundation steel cage, which is mainly composed of a grading ring, an inner grounding ring, and an outer grounding ring, and supplemented by multiple vertical grounding electrodes; The connecting device in step S5 comprises a first connecting block (51) and a second connecting block (52) that can be assembled; The first connecting block (51) comprises a first fixing ear (501), a first semi-arc plate (502), a second semi-arc plate (503), and a second fixing ear (504) which are sequentially connected from top to bottom and integrally formed; The second connecting block (52) comprises a third fixing ear (505), a third semi-arc plate (506), a fourth semi-arc plate (507) and a fourth fixing ear (508) which are sequentially connected from top to bottom and integrally formed; When the first connecting block (51) and the second connecting block (52) are assembled, the first fixing ear (501) and the third fixing ear (505) are fitted together, the second fixing ear (504) and the fourth fixing ear (508) are fitted together, the first semi-arc plate (502) and the third semi-arc plate (506) are buckled together to form a first circular hole (509), and the second semi-arc plate (503) and the fourth semi-arc plate (507) are buckled together to form a second circular hole (510); The bottom of the inner grounding ring and the first grounding ring mounting track, and the bottom of the outer grounding ring and the second grounding ring mounting track are respectively fixed by a plurality of fixing devices (400); The fixing device (400) comprises a first fixing plate (401) and a second fixing plate (402) arranged in parallel and spaced apart, and a semicircular plate (403) arranged between the first fixing plate (401) and the second fixing plate (402); and mounting holes (404) are respectively provided on the first fixing plate (401) and the second fixing plate (402).

2. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 1, characterized in that: The diameter of the second grounding ring installation track in step S2 is greater than the diameter of the first grounding ring installation track; The depth of the first grounding ring installation channel and the second grounding ring installation channel shall not be less than 800 mm.

3. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 2, characterized in that: In step S3, the diameters of the inner grounding ring and the outer grounding ring are both larger than the diameter of the wind turbine foundation reinforcement cage and are both concentric with the anchor cage; The buried depth of the inner grounding ring and the outer grounding ring is not less than 800 mm.

4. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 3, characterized in that: In step S4, adjacent aluminum strands of the four aluminum strands are perpendicular to each other and point to the center of the anchor cage respectively; the buried depth of the four aluminum strands is not less than 800 mm.

5. A method for constructing a lightning protection grounding network for a wind turbine foundation based on aluminum stranded wire according to any one of claims 1 to 4, characterized in that: The central axes of the first circular hole (509) and the second circular hole (510) are not in the same plane and are perpendicular to each other.

6. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 5, characterized in that: The first fixing ear (501), the second fixing ear (504), the third fixing ear (505) and the fourth fixing ear (508) are all provided with a retaining bolt hole (511); The bolt holes on the first fixing ear (501) and the third fixing ear (505) are positioned to match each other; The bolt holes on the second fixing ear (504) and the fourth fixing ear (508) are positioned to match each other.

7. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 6, characterized in that: The first fixing plate (401), the semicircular plate (403) and the second fixing plate (402) are integrally formed.

8. The method for constructing a wind turbine foundation lightning protection grounding network based on aluminum stranded wire according to claim 7, characterized in that: In step S6, the vertical grounding electrode and the outer grounding ring are connected with a copper braided wire through the middle bolt hole.

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