Offshore photovoltaic foundation structure and construction method

Abstract

The invention discloses an offshore photovoltaic foundation structure and a construction method, and relates to the technical field of offshore photovoltaic.The offshore photovoltaic foundation structure comprises a foundation body; the foundation body comprises one or more mutually connected foundation units, reserved cup openings used for being connected with photovoltaic stand columns are limited by the foundation units, the foundation units are of a raft structure, and the bottoms of the foundation units are used for making contact with the seabed mud surface. According to the offshore photovoltaic foundation structure provided by the invention, the plurality of foundation units are mutually connected to form the foundation body, and each foundation unit adopts a raft structure, so that the bottom of each foundation unit is in contact with a seabed mud surface, and the contact area between the foundation body and the seabed mud surface can be increased; and differential settlement of the foundation body is reduced, then differential settlement of offshore photovoltaic can be reduced, the cracking risk of an offshore photovoltaic module is reduced, and the overall generating capacity of an offshore photovoltaic field area is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore photovoltaic technology, and more specifically, to a foundation structure and a construction method for offshore photovoltaic. Background Art

[0002] Traditional land photovoltaics have many problems such as large land occupation area, which restricts the further development of photovoltaics. Compared with traditional onshore centralized and distributed photovoltaic power generation, offshore photovoltaics have the characteristics of less land resource occupation and have become a new trend in photovoltaic power generation.

[0003] Traditional offshore photovoltaics usually use precast concrete piles in the shape of hollow cylinders made by the pretensioning process and hoist them onto the seabed mud surface to support offshore photovoltaic modules. However, the hollow cylindrical precast concrete piles face problems such as long-term uneven settlement during operation, resulting in a risk of cracking of the offshore photovoltaic modules, thereby reducing the overall power generation of the offshore photovoltaic field area.

[0004] Therefore, how to reduce the uneven settlement of offshore photovoltaics has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a foundation structure for offshore photovoltaics to reduce the uneven settlement of offshore photovoltaics.

[0006] Another purpose of the present invention is to provide a construction method for the above-mentioned foundation structure for offshore photovoltaics.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A foundation structure for offshore photovoltaics, comprising:

[0009] A foundation body, the foundation body includes one or more interconnected foundation units, the foundation units define a reserved cup for connecting with a photovoltaic column, the foundation units are raft structures, and the bottom of the foundation units is used to contact the seabed mud surface.

[0010] Optionally, in the above-mentioned foundation structure for offshore photovoltaics, a plurality of support surfaces are provided on the top of the foundation unit, and the support surfaces have a first side and a second side arranged opposite to each other. The first side of the support surface is connected to the outside of the reserved cup, the second side of the support surface is connected to the edge of the foundation unit, and the first side of the support surface is higher than the second side of the support surface, so that the support surface is inclined towards the side of the reserved cup.

[0011] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, the foundation unit includes a plurality of sidewall skirt plates, and the sidewall skirt plates are connected end to end to enclose and form the foundation unit, and the reserved cup-shaped opening is located at the central position of the foundation unit.

[0012] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, the height of the sidewall of the reserved cup-shaped opening is greater than the height of the sidewall skirt plate, and the first side of the support surface is connected to the edge of the reserved cup-shaped opening.

[0013] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, two adjacent foundation units share one sidewall skirt plate.

[0014] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, the foundation unit further includes a plurality of thin-walled beams, and the thin-walled beams are used to connect the connection positions of two adjacent sidewall skirt plates to the outer wall of the reserved cup-shaped opening.

[0015] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, the thin-walled beams are symmetrically distributed outside the reserved cup-shaped opening.

[0016] Optionally, in the above-described infrastructure for offshore photovoltaic power generation, a plurality of lifting lugs for facilitating hoisting are pre-embedded on the foundation unit, and the lifting lugs are symmetrically distributed on the top surface of the foundation unit.

[0017] A construction method for the infrastructure for offshore photovoltaic power generation as described in any one of the above, includes the steps of:

[0018] Determine the foundation unit parameters, where the foundation unit parameters include the number of the foundation units, the size of the foundation units, and the distribution mode of the foundation units;

[0019] Prefabricate the foundation body, and prefabricate the foundation body according to the determined foundation unit parameters;

[0020] Hoist the foundation body, and use a hoisting device to hoist the foundation body to the seabed mud surface through the lifting lugs of the foundation body.

[0021] Optionally, in the above construction method, between the step of prefabricating the foundation body and the step of hoisting the foundation body, there is also a step of:

[0022] Pre-install the photovoltaic column, and install the prefabricated photovoltaic column into the reserved cup-shaped opening of the foundation unit; or,

[0023] After the step of hoisting the foundation body, there is also a step of:

[0024] Install the photovoltaic column, and install the prefabricated photovoltaic column into the reserved cup-shaped opening of the foundation unit located on the seabed mud surface.

[0025] The foundation structure for offshore photovoltaic provided by the present invention forms a foundation body through the connection of one or more foundation units of raft structures, and the bottom of each foundation unit is in contact with the seabed mud surface, so as to increase the contact area between the foundation body and the seabed mud surface and reduce uneven settlement. At the same time, a reserved cup-shaped opening is formed in the foundation unit to facilitate the connection of the photovoltaic columns, so as to connect with the photovoltaic columns of the offshore photovoltaic module. As can be seen from the above example, the foundation structure for offshore photovoltaic provided by the present invention forms a foundation body through the connection of multiple foundation units, and each foundation unit adopts a raft structure, so that the bottom of each foundation unit is in contact with the seabed mud surface, thereby increasing the contact area between the foundation body and the seabed mud surface, reducing the uneven settlement of the foundation body, further reducing the uneven settlement of the offshore photovoltaic, reducing the cracking risk of the offshore photovoltaic module, and improving the overall power generation of the offshore photovoltaic field.

[0026] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily as long as the combined technical features are not mutually contradictory. All feasible feature combinations are the technical contents clearly recorded in this article. Any one of the sub-features included in the same statement can be applied independently without necessarily being applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a schematic structural diagram of the foundation body provided in the first embodiment of the present invention;

[0029] Figure 2 It is a schematic structural diagram of the foundation body provided in the second embodiment of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the foundation body provided in the third embodiment of the present invention;

[0031] Figure 4 It is a schematic structural diagram of the foundation unit provided in the embodiment of the present invention;

[0032] Figure 5 It is a schematic flow chart of the construction method provided in the embodiment of the present invention Figure 1 ;

[0033] Figure 6 Schematic diagram of the construction method provided by the embodiment of the present invention Figure 2 ;

[0034] Figure 7 Schematic diagram of the construction method provided by the embodiment of the present invention Figure 3 .

[0035] Among them, 100 is the basic body, 10 is the basic unit, and 20 is the reserved cup mouth;

[0036] 11 is the bottom, 12 is the top, 121 is the supporting surface, 13 is the hanging ear, 14 is the side wall skirt, and 15 is the thin-wall beam;

[0037] 200 are photovoltaic columns. DETAILED DESCRIPTION

[0038] The core of the present invention is to provide a basic structure for offshore photovoltaics to reduce the uneven settlement of offshore photovoltaics.

[0039] Another core of the present invention is to provide a construction method for the above-mentioned infrastructure for offshore photovoltaics.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Traditional offshore photovoltaic systems usually use prestressed hollow cylindrical precast concrete piles (Prestressed High-strength Concrete Piles, hereinafter referred to as PHC pile foundations) made by prestressing technology and hoisted to the seabed mud surface to support offshore photovoltaic modules.

[0042] Due to the deep silt layer on the seabed, the geological soil layer is uneven, which makes the PHC pile foundation face problems such as long-term uneven settlement during operation, causing the photovoltaic columns of the offshore photovoltaic modules to tilt, thereby causing the support beams of the photovoltaic modules to tilt, twist or bend. The deformation of the support will cause the edges of the photovoltaic modules to be pulled or compressed, causing cracks on the glass surface of the photovoltaic modules. And when the photovoltaic modules are twisted, tensile stress perpendicular to the surface will be generated inside the glass of the photovoltaic modules, resulting in penetrating cracks, reducing the overall power generation of the offshore photovoltaic field.

[0043] For this reason, Figure 1As shown in the figure, an embodiment of the present application discloses an infrastructure for offshore photovoltaic, including a foundation body 100. The foundation body 100 is formed by connecting one or more foundation units 10, and each foundation unit 10 adopts a raft structure, so that the bottom 11 of each foundation unit 10 is in contact with the seabed mud surface, thereby increasing the contact area between the foundation body 100 and the seabed mud surface, reducing the uneven settlement of the foundation body 100, further reducing the uneven settlement of the offshore photovoltaic, reducing the cracking risk of the offshore photovoltaic modules, and improving the overall power generation of the offshore photovoltaic field.

[0044] The following will combine Figures 1 to 4 to specifically explain and illustrate the infrastructure for offshore photovoltaic disclosed in the embodiments of the present application.

[0045] Among them, the foundation body 100 can be composed of one or more interconnected foundation units 10, that is, the foundation body 100 can be composed of one foundation unit 10, or can be composed of two, three or more foundation units 10. At the same time, as Figure 2 shown, each foundation unit 10 can be interconnected to form a single-row foundation body 100, or as Figure 1 and Figure 3 shown, each foundation unit 10 can be interconnected to form a foundation body 100 with two or more rows. The specific quantity and distribution form of the foundation units 10 can be determined according to actual requirements.

[0046] As Figure 4 shown, the foundation unit 10 can adopt a raft structure to increase the contact area between the bottom 11 of the foundation unit 10 and the seabed mud surface, thereby effectively reducing the uneven settlement of the foundation body 100, further reducing the uneven settlement of the offshore photovoltaic, reducing the cracking risk of the offshore photovoltaic modules, and improving the overall power generation of the offshore photovoltaic field. At the same time, a reserved cup 20 for connecting with the photovoltaic column 200 is formed on the foundation unit 10 for the connection between the photovoltaic column 200 and the foundation unit 10.

[0047] Exemplarily, the basic unit 10 can adopt a reinforced concrete structure, and the basic body 100 can be hoisted onto the seabed mud surface after being prefabricated on land, so as to reduce the construction process and improve the construction efficiency of the basic structure. Among them, after the photovoltaic column 200 is prefabricated, it can be pre-installed in the reserved cup 20 of the basic unit 10, and then the basic body 100 with the photovoltaic column 200 is hoisted onto the seabed mud surface as a whole through a hoisting device, thereby completing the construction process below the sea surface, and further reducing the construction difficulty of the sea surface photovoltaic system and improving the construction efficiency of the sea surface photovoltaic system. Of course, the prefabricated photovoltaic column 200 can also be installed in the reserved cup 20 of the basic unit 10 after the basic body 100 is hoisted onto the seabed mud surface. It should be noted that the connection between the photovoltaic column 200 and the basic unit 10 can be achieved by pouring high-strength concrete in the reserved cup 20, or by leaving steel bars in both the photovoltaic column 200 and the reserved cup 20 and then pouring concrete for connection. Of course, other connection methods between prefabricated components can also be used, which are not limited herein.

[0048] Exemplarily, when the basic body 100 is composed of two or more basic units 10, each basic unit 10 can be connected by integral casting. That is, first, according to the determined size, quantity and layout of the basic unit 10, the steel bar skeletons of each basic unit 10 are connected together to form the overall steel bar skeleton of the basic body 100, and then concrete is poured on the overall steel bar skeleton to form the basic body 100 formed by connecting each basic unit 10; of course, each basic unit 10 can also be connected by split casting. That is, first, according to the determined size, quantity and layout of the basic unit 10, each basic unit 10 is prefabricated, and steel bars are reserved at the connection positions of adjacent two basic units 10. When connecting, the steel bars reserved by one of the adjacent two basic units 10 are inserted into the connection sleeve of the other, and at the same time, high-strength mortar is poured in the connection sleeve and between the adjacent two basic units 10 to realize the connection between the adjacent two basic units 10, thereby forming the basic body 100 formed by connecting each basic unit 10.

[0049] The basic structure for offshore photovoltaic disclosed in the embodiments of the present invention forms a basic body 100 through the connection of one or more raft-structured basic units 10, and the bottom 11 of each basic unit 10 is in contact with the seabed mud surface, so as to increase the contact area between the basic body 100 and the seabed mud surface and reduce uneven settlement. At the same time, the basic unit 10 is formed with a reserved cup 20 that is convenient for connecting the photovoltaic column 200, so as to connect with the photovoltaic column 200 of the offshore photovoltaic module.

[0050] The foundation structure for offshore photovoltaic power generation disclosed in the embodiments of the present invention is formed by connecting one or more foundation units 10 to form a foundation body 100. Each foundation unit 10 adopts a raft structure, so that the bottom 11 of each foundation unit 10 is in contact with the seabed mud surface, thereby increasing the contact area between the foundation body 100 and the seabed mud surface, reducing the uneven settlement of the foundation body 100, further reducing the uneven settlement of the offshore photovoltaic power generation, reducing the cracking risk of the offshore photovoltaic modules, and improving the overall power generation of the offshore photovoltaic power generation area.

[0051] As Figure 4 shown, a plurality of support surfaces 121 may be provided on the top 12 of the foundation unit 10, that is, the number of the support surfaces 121 may be three, four or more. Among them, the support surface 121 may adopt an isosceles trapezoid structure, and the support surface 121 has two opposite sides. For the convenience of understanding, the two sides of the support surface 121 are respectively defined as the first side and the second side. The first side of the support surface 121 may be connected to the outer side of the reserved cup 20, and the second side of the support surface 121 may be connected to the edge of the foundation unit 10. At the same time, the first side of the support surface 121 is higher than the second side of the support surface 121, so that the support surface 121 is inclined towards the reserved cup 20 side, thereby reducing the scouring effect of seawater on each foundation unit, and dispersing the water pressure of seawater on the foundation unit, further reducing the uneven settlement, reducing the cracking risk of the offshore photovoltaic modules, and improving the overall power generation of the offshore photovoltaic power generation area.

[0052] Exemplarily, the cross-section of the foundation unit 10 may adopt a rectangle, and the cross-section of the reserved cup 20 may adopt a rectangle similar to the cross-sectional shape of the foundation unit 10, and the reserved cup 20 may be located at the center position of the foundation unit 10. Four support surfaces 121 may be adopted. The second sides of the respective support surfaces 121 are respectively connected to the four side edges of the foundation unit 10. At the same time, the first sides of the respective support surfaces 121 are respectively connected to the four side surfaces of the reserved cup 20, so that the foundation unit 10 forms a frustum structure. It should be noted that the cross-section of the foundation unit 10 may also adopt a triangle, a pentagon or other polygons. At the same time, the reserved cup 20 may adopt a triangle, a pentagon or other polygons similar to the cross-sectional shape of the foundation unit 10, or a circle similar to the cross-sectional shape of the photovoltaic column 200.

[0053] As Figure 4 shown, the foundation unit 10 may include a plurality of side wall skirt plates 14, that is, the side wall skirt plates 14 may be three, four or more, which may be specifically determined according to the cross-sectional shape of the foundation unit 10. At the same time, the respective side wall skirt plates 14 are connected end to end to enclose and form the foundation unit 10, and the reserved cup 20 is located at the center position of the foundation unit 10.

[0054] Exemplarily, the sidewall skirt 14 can adopt a reinforced concrete structure and can be concreted simultaneously with the main structure of the foundation unit 10, so that the sidewall skirt 14 and the main structure of the foundation unit 10 form an integral whole, improving the overall stability of the foundation unit 10.

[0055] Exemplarily, as Figures 1 to 3 shown, two adjacent foundation units 10 can share a sidewall skirt 14, thereby reducing the amount of steel bars used and improving the overall stability of the foundation body 100 at the same time.

[0056] Exemplarily, as Figure 4 shown, the height of the sidewall of the reserved cup 20 can be greater than the height of the sidewall skirt 14, and the first side of the support surface 121 can be connected to the edge of the reserved cup 20 to form an inclined support surface 121.

[0057] As Figure 4 shown, the foundation unit 10 can further include a plurality of thin-walled beams 15, that is, the number of thin-walled beams 15 can be three, four or more, and the thin-walled beams 15 can connect the connection positions of two adjacent sidewall skirts 14 and the outer wall of the reserved cup 20 to improve the overall stability and shear resistance of the foundation unit 10.

[0058] Exemplarily, the thin-walled beams 15 can adopt a reinforced concrete structure, and each thin-walled beam 15 can be symmetrically distributed outside the reserved cup 20, and the thin-walled beams 15 and the main structure of the foundation unit 10 can be concreted simultaneously, so that the thin-walled beams 15 and the main structure of the foundation unit 10 form an integral whole, improving the overall stability of the foundation unit 10.

[0059] As Figures 1 to 3 shown, a plurality of lifting lugs 13 convenient for lifting can be embedded on the foundation unit 10, that is, the number of lifting lugs 13 can be three, four or more, and each lifting lug 13 is symmetrically distributed on the top 12 of the foundation unit 10, so as to lift the foundation body 100 to the seabed mud surface through a lifting device.

[0060] Exemplarily, each foundation unit 10 can adopt four lifting lugs 13, and each lifting lug 13 is respectively located at the corner positions of the foundation unit 10, thereby ensuring the stability of the lifting device for lifting the foundation body 100 and avoiding the foundation body 100 from shifting during lifting.

[0061] As Figure 5 shown, the embodiment of the present application also discloses a construction method for the foundation structure for offshore photovoltaic as disclosed in the above embodiment. Therefore, this construction method has all the technical effects of the above foundation structure for offshore photovoltaic, and will not be elaborated herein.

[0062] Among them, as Figure 5As shown, the construction method includes step S100 of determining the number of foundation units, step S200 of prefabricating the foundation body, and step S300 of hoisting the foundation body. The following will combine Figures 5 to 7 to specifically explain and illustrate the construction method disclosed in the embodiments of the present application.

[0063] Step S100, determining the parameters of the foundation unit;

[0064] According to actual requirements, such as site requirements, photovoltaic power generation requirements, etc., determine the number, size, and distribution method of the foundation units 10 of the foundation body 100.

[0065] Step S101, prefabricating the foundation body;

[0066] According to the determined number, size, and distribution method of the foundation units 10, prefabricate the foundation body 100 on land.

[0067] Step S102, hoisting the foundation body;

[0068] Connect the hooks of the hoisting equipment to the lifting lugs 13 of the foundation body 100 respectively through traction members such as steel ropes, so as to hoist the foundation body 100 to the seabed mud surface by the hoisting equipment. It should be noted that the hoisting equipment can be fixed on a large transport ship or an open ship.

[0069] As Figure 6 shown, between step S200 of prefabricating the foundation body and step S300 of hoisting the foundation body, step S201 of pre-installing the photovoltaic columns can also be included. In step S201 of pre-installing the photovoltaic columns, the prefabricated photovoltaic columns 200 can be pre-installed in the reserved cup mouths 20 of the foundation units 10, and then the foundation body 100 with the photovoltaic columns 200 is hoisted as a whole to the seabed mud surface, thereby completing the construction process below the sea surface, and further reducing the construction difficulty of the sea surface photovoltaic system and improving the construction efficiency of the sea surface photovoltaic system. It should be noted that the connection method between the photovoltaic columns 200 and the foundation units 10 has been explained and illustrated above, and will not be repeated here.

[0070] Of course, the photovoltaic columns 200 can also be installed after the foundation body 100 is hoisted to the seabed mud surface. As Figure 7 shown, after step S300 of hoisting the foundation body 100, step 301 of installing the photovoltaic columns can also be included. In step 301 of installing the photovoltaic columns, the prefabricated photovoltaic columns 200 can be installed in the reserved cup mouths 20 of the foundation units 10 located on the seabed mud surface, and the reserved cup mouths 20 are grouted through a high-pressure grouting system, so as to connect the prefabricated photovoltaic columns 200 with the foundation units 10 located on the seabed mud surface.

[0071] In the description and claims of the present invention and the above-mentioned drawings, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed.

[0072] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A basic structure for offshore photovoltaics, characterized in that: include: A basic body (100), the basic body (100) comprising one or more interconnected basic units (10), the basic unit (10) defining a reserved cup opening (20) for connection with a photovoltaic column (200), the basic unit (10) being a raft structure, and the bottom (11) of the basic unit (10) being used for contacting the seabed mud surface.

2. The infrastructure for offshore photovoltaics according to claim 1, characterized in that: The top (12) of the base unit (10) is provided with a plurality of support surfaces (121), and the support surface (121) has a first side and a second side that are arranged opposite to each other, the first side of the support surface (121) is connected to the outer side of the reserved cup opening (20), the second side of the support surface (121) is connected to the edge of the base unit (10), and the first side of the support surface (121) is higher than the second side of the support surface (121), so that the support surface (121) is arranged to be inclined toward the reserved cup opening (20).

3. The infrastructure for offshore photovoltaics according to claim 2, characterized in that: The basic unit (10) comprises a plurality of side wall skirt panels (14), and each of the side wall skirt panels (14) is connected end to end to surround and form the basic unit (10), and the reserved cup opening (20) is located at a central position of the basic unit (10).

4. The infrastructure for offshore photovoltaics according to claim 3, characterized in that: The height of the side wall of the reserved cup opening (20) is greater than the height of the side wall skirt plate (14), and the first side of the support surface (121) is connected to the edge of the reserved cup opening (20).

5. The infrastructure for offshore photovoltaics according to claim 3, characterized in that: Two adjacent basic units (10) share one side wall skirt plate (14).

6. The infrastructure for offshore photovoltaics according to claim 3, characterized in that: The basic unit (10) further comprises a plurality of thin-walled beams (15), wherein the thin-walled beams (15) are used to connect the connection positions of two adjacent side wall skirt panels (14) and the outer wall of the reserved cup opening (20).

7. The infrastructure for offshore photovoltaics according to claim 6, characterized in that: The thin-walled beams (15) are symmetrically distributed on the outside of the reserved cup opening (20).

8. The infrastructure for offshore photovoltaics according to any one of claims 1 to 7, characterized in that: A plurality of lifting ears (13) for facilitating lifting are pre-buried on the basic unit (10), and each of the lifting ears (13) is symmetrically distributed on the top (12) of the basic unit (10).

9. A construction method, for the foundation structure for offshore photovoltaics according to any one of claims 1 to 8, characterized in that: Includes steps: Determining basic unit parameters, the basic unit parameters including the number of the basic units (10), the size of the basic units (10) and the distribution of the basic units (10); Prefabricate a basic body, and prefabricate the basic body (100) according to the determined parameters of the basic unit (10); The basic body is hoisted by using hoisting equipment to hoist the basic body (100) onto the seabed mud surface via the hoisting lugs (13).

10. The construction method according to claim 9, characterized in that: Between the step of prefabricating the basic body and the step of hoisting the basic body, the following steps are also included: Pre-installing the photovoltaic column, installing the prefabricated photovoltaic column (200) in the reserved cup opening (20) of the basic unit (10); or, After the step of hoisting the basic body, the method further includes the following steps: The photovoltaic column is installed by installing the prefabricated photovoltaic column (200) in the reserved cup opening (20) of the basic unit (10) located on the seabed mud surface.

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