Photovoltaic sand-fixing device and sand-fixing method

Abstract

The application discloses a photovoltaic sand-fixing device and a sand-fixing method, and belongs to the technical field of photovoltaic sand control. The device comprises multiple rows of protection units. The protection unit comprises a photovoltaic panel, a support, a foundation pile and a sand-fixing net. The foundation pile is provided with a pre-embedded part, and the pre-embedded part is connected with a pressing strip plate. The pressing strip plate presses the sand-fixing net on the pre-embedded part. The sand-fixing net is arranged between the foundation piles, so that the ground wind speed can be reduced, the wind sand can be effectively blocked, the construction operation is facilitated, the material cost is reduced, the change of terrain is adapted, the growth of vegetation is not hindered, the sand-fixing net is pressed tightly on a strip surface, the service life of the sand-fixing net at the connecting position is longer, and the connection is more stable. The sand-fixing net is continuously laid on one row of protection units, so that the installation is rapid and simple. When partial damage occurs, a section of the sand-fixing net between two foundation piles can be replaced individually, so that the replacement is simple and fast, the entire sand-fixing net does not need to be replaced, and the maintenance cost is low.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic desertification control technology, specifically relating to a photovoltaic sand fixation device and sand fixation method. Background Technology

[0002] Photovoltaic desertification control is an innovative model that integrates photovoltaic power generation with desert ecological governance. It involves building photovoltaic power stations in deserts, Gobi and other areas to generate electricity using solar energy resources. At the same time, ecological engineering projects such as windbreak and sand fixation and vegetation restoration are implemented under or around the photovoltaic panels to achieve coordinated development of "energy development + ecological governance". Existing photovoltaic devices are usually used in combination with sand barriers, such as: straw checkerboard sand barriers, tall vertical sand-blocking boards and hanging curtain brush sand barriers. There are some problems with the use of these sand barriers.

[0003] I. Straw checkerboard sand barrier

[0004] Existing disadvantages: high laying costs (labor costs, transportation costs, maintenance costs), low efficiency, easy degradation, and limited wind and sand resistance.

[0005] Relying on manual laying of straw / reeds is prone to wind erosion, with an annual material loss rate of 20%-30%, requiring frequent replacement. Furthermore, the specifications of the straw checkerboard sand barriers are difficult to determine. Small-sized straw checkerboard sand barriers offer good sand control, but are costly, with annual maintenance costs of 800-1000 yuan per acre. Large-sized straw checkerboard sand barriers are susceptible to erosion in the center, hindering the growth of sand-fixing plants. In some areas, procuring materials is difficult, requiring long-distance collection and transportation, increasing transportation costs. Laying efficiency is low (only 50-80 square meters per man-day), making it unsuitable for large-scale sand control needs; laying under the boards is difficult to do with machinery, increasing labor costs.

[0006] II. High-rise sand-blocking board

[0007] Existing disadvantages: complex installation, easy to be buried by sand after long-term use, rigid structure is easily deformed by strong wind pressure, high installation and construction costs, requires separate pouring of concrete columns (spacing 1.5-2m), cost of 300-400 yuan per meter of column, poor environmental performance, wind and sand flow around the bottom causes sand accumulation behind the board, requiring regular sand cleaning (2-3 times a year).

[0008] III. Hanging Curtain-Type Brush-Shaped Sand Barrier

[0009] Existing disadvantages: The commonly used materials for suspended brush-type sand barriers, straw bundles and palm fibers, have a short service life. Transportation costs also exist in some areas. Straw bundles are easily worn and broken by wind and sand (an average annual breakage rate of 40%), requiring replacement every 2-3 years, resulting in high maintenance costs. Nylon ropes and plastic strips pose a pollution risk and easily cause localized sand accumulation, requiring regular cleaning. The suspension structure has poor stability (wind resistance level ≤10), requiring ground anchors, sandbags, or concrete foundations for fixation. It is prone to collapsing or tearing in strong winds, necessitating the installation of additional upper and lower fixing crossbars, resulting in low installation efficiency; each 100m requires 2-3 working days. Summary of the Invention

[0010] In view of the above-mentioned problems in the prior art, the technical problem to be solved by the present invention is to provide a photovoltaic sand fixation device and sand fixation method to reduce the cost of sand fixation and increase the service life of sand barriers.

[0011] Technical Solution: To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] A photovoltaic sand-fixing device includes multiple rows of protective units. Each protective unit includes a photovoltaic panel, a bracket connected to the photovoltaic panel, a foundation pile connected to the bracket, and a sand-fixing net connected to the foundation pile. The foundation pile is provided with a pre-embedded part, and a pressure strip is connected to the pre-embedded part. The pressure strip presses the sand-fixing net onto the pre-embedded part.

[0013] Preferably, the embedded part is connected to the pressure strip plate by fastening bolts, and the pressure strip plate is provided with a first through hole corresponding to the fastening bolts.

[0014] Preferably, the embedded part is provided with a first frosted layer, the pressure strip includes a base plate and a plastic plate, and the plastic plate is provided with a second frosted layer corresponding to the first frosted layer.

[0015] Preferably, the sand-fixing net has rolled edges at both the top and bottom ends, and reinforcing ribs run through the rolled edges.

[0016] Preferably, the embedded part has a second through hole on its side corresponding to the reinforcing rib.

[0017] Preferably, the height of the upper end of the foundation pile from the ground is A, 1m≤A≤2m, the height of the upper end of the sand-fixing net from the ground is B, 0.5m≤B≤1.5m, and the distance between two adjacent rows of protective units in the multi-row protective units is E, 5m≤E≤20m.

[0018] Preferably, the mesh size of the sand-fixing net is C, where 0.1mm ≤ C ≤ 5mm.

[0019] Preferably, the sand-fixing net includes two or more mesh sizes.

[0020] The present invention also provides a photovoltaic sand fixation method, which uses the above-mentioned photovoltaic sand fixation device and includes the following steps:

[0021] Step 1: Multiple rows of protective units are installed in the desert. Each row of protective units includes multiple foundation piles. The foundation piles are driven into the desert ground. The foundation piles are reserved at a height of A on the ground, where 1m≤A≤2m. The photovoltaic panels are connected to the foundation piles through brackets, so that the photovoltaic panels are suspended in the air. The distance between two adjacent foundation piles in each row of protective units is D, where 2m≤D≤5m.

[0022] Step 2: Unroll the rolled sand-fixing net along a row of protective units. The height of the top of the sand-fixing net from the ground is B, where 0.5m ≤ B ≤ 1.5m.

[0023] Step 3: Use pressure strips to press the sand-fixing mesh corresponding to the embedded part onto the embedded part. Connect the pressure strips and sand-fixing mesh to the embedded part by fastening bolts. Multiple pressure strips press the sand-fixing mesh onto the embedded parts of multiple protection units respectively.

[0024] Step 4: Pass the reinforcing bar through the rolled edge of the sand-fixing mesh between two adjacent foundation piles, and fix both ends of the reinforcing bar to the embedded parts;

[0025] Step 5: Repeat steps 2 to 4 until all rows of protective units are covered with sand-fixing netting;

[0026] Step 6: Plant plants between the multiple rows of protective units.

[0027] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0028] 1. This invention utilizes the foundation piles of photovoltaic devices and sets up sand-fixing nets between the foundation piles, which can reduce surface wind speed by 30%-50%, protect drought-resistant plants such as four-winged icewort and saxaul planted between downwind protection units, and reduce sand dune movement between downwind protection units, thus reducing the erosion of photovoltaic panels and plants by sand dune movement. Compared with existing straw checkerboard sand barriers, the materials of this application are easy to purchase, and the aging-resistant nylon sand-fixing net (with added UV inhibitors) has a wind erosion resistance life of more than 5 years, which is 1.5 times the service life of straw checkerboard sand barriers; the annual loss rate is <5%, and the maintenance cost is reduced by more than 60%; the installation is simple through mechanical fixing with embedded parts and pressure strips, and the laying time of a single row of protection units is shortened by 60% compared with straw checkerboard, realizing mechanized and rapid construction, which is suitable for large-scale desertification control; the sand prevention and control effect is better, and the erosion of the foundation pile area by wind is reduced. Compared to existing tall vertical sand-blocking boards, this method eliminates the need for separate columns, resulting in lower costs and structural reuse: it directly utilizes photovoltaic foundation piles for support, saving independent columns and reducing material costs by over 40%, without requiring additional construction. Sand-blocking optimization: the sand-fixing net is vertically installed (0.5m-1.5m high, 0.1mm-5mm aperture), precisely trapping sand particles with a diameter of 0.1mm-1mm (accounting for 70% of the displaced sand particles). Compared to existing hanging curtain-type brush-shaped sand barriers, this method is simpler to install and lower in cost. The sand-fixing net in this application incorporates UV-resistant agents, extending its service life to over 10 years. The pressure strips are bolted to the embedded parts to form a strip-shaped surface for compression, increasing wind resistance to level 12. The material has good flexibility, reducing net deformation by 50%. The average annual damage rate is reduced to below 5%. Single damaged areas can be partially replaced (time <10 minutes / area), improving maintenance efficiency by 70% and ensuring uniform sand-blocking effect.

[0029] 2. The height of the sand-fixing net is 0.5m-1.5m. (1) Effectively blocks wind and sand: This height range just covers the wind and sand activity layer of 0-1.5m on the ground surface (more than 90% of the jumping sand particles are concentrated in this area), which can reduce the surface wind speed by 30%-50% (actual data: when the wind speed is 8m / s, the wind speed 1m behind the sand-fixing net drops to 4-5m / s), so that the sand particles in the wind and sand are deposited in front of the net, reducing the erosion and sandification of the ground by wind and sand; (2) Facilitates construction and operation: This height range is relatively moderate. When installing and maintaining the sand-fixing net, the construction personnel do not need to use complicated climbing equipment. The operation is less difficult, which is conducive to improving construction efficiency and ensuring construction safety; (3) Reduces material costs: Compared with unreasonable heights of higher or lower, The height setting of 0.5m-1.5m can meet the needs of sand fixation and achieve reasonable control of material usage, thus reducing the cost of sand fixation projects; (4) Adapting to terrain changes: Within this height range, the sand fixation net can better adapt to the undulations of different terrains. Whether in flat sandy areas or sand dune areas with a certain slope, it can maintain a relatively stable sand fixation effect; it can be promoted on a large scale; (5) Not hindering vegetation growth: This height will not seriously block or hinder the natural growth of sandy vegetation, providing a stable growth environment for plants such as four-winged thorn and tamarisk (0.3-1m in height), which is conducive to the restoration of the original vegetation in sandy areas and the cultivation of new vegetation. Combined with vegetation sand fixation measures, it can play a better ecological sand fixation role;

[0030] 3. The foundation piles are equipped with embedded parts, and the embedded parts are connected to the pressure strips by fastening bolts. The pressure strips are used to press the sand-fixing net onto the embedded parts, thus completing the connection between the sand-fixing net and the foundation piles. Compared with using ropes to connect the sand-fixing net at "points" and tie "lines", this invention presses the sand-fixing net onto a strip surface, causing less damage to the sand-fixing net. After the sand-fixing net is connected and tightened, the stress is more even, the life of the sand-fixing net at the connection is longer, and the connection is more stable.

[0031] 4. The pressure strip includes a base plate and a plastic plate. The plastic plate has a certain elasticity, and by setting the first frosted layer and the second frosted layer, the fixing effect of the sand-fixing net is better, the damage to the net body is less when it is pressed, and the connection stability and service life of the sand-fixing net are improved.

[0032] 5. The sand-fixing net is equipped with rolled edges and reinforcing ribs to improve its wind resistance and reduce deformation and tearing.

[0033] 6. The sand-fixing net is set with different apertures, with smaller apertures at the bottom and larger apertures at the top. The smaller apertures at the bottom can block the leaping and creeping of sand particles near the ground, while the larger apertures at the top can allow airflow to pass through smoothly, preventing the sand barrier from tipping over or tearing due to excessive wind pressure.

[0034] 7. The sand-fixing net is fixed by the embedded parts and pressure strips on the protective unit. The sand-fixing net is laid continuously on a row of protective units. The installation is quick and simple. When there is local damage, a section of sand-fixing net between two foundation piles can be replaced. The replacement is simple and quick, without the need to replace the entire sand-fixing net, and the maintenance cost is low. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the protective unit structure of Embodiment 1 of the present invention;

[0036] Figure 2 This is a schematic diagram of the foundation piles and embedded parts in Example 1;

[0037] Figure 3 This is a schematic diagram of the sand-fixing net structure in Example 1;

[0038] Figure 4 This is a top view schematic diagram of the foundation piles and sand-fixing net structure in Example 1;

[0039] Figure 5 This is a schematic diagram of the structure at one end of the reinforcing rib in Example 1;

[0040] Figure 6 This is a schematic diagram of the internal structure of the foundation pile in Example 1;

[0041] Figure 7 This is a schematic diagram of the longitudinal cross-sectional structure when the pressure strip plate presses the sand mesh in Example 1;

[0042] Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the embedded part in Example 1;

[0043] Figure 9 This is a schematic diagram of the longitudinal cross-sectional structure of the pressure strip in Example 1;

[0044] Figure 10 This is a schematic diagram showing the height of each part of the protective unit in Embodiment 1;

[0045] Figure 11 This is a schematic diagram of the multi-row protective unit structure in Example 1;

[0046] Figure 12 This is a partial structural diagram of the sand-fixing net in Example 3;

[0047] Figure 13 This is a partial structural diagram of the sand-fixing net in Example 4;

[0048] Among them, 1. Photovoltaic panel; 2. Support frame; 3. Foundation pile; 31. Reinforcing cage; 32. Reinforcing column; 4. Sand-fixing net; 41. Rolled edge; 42. Reinforcing bar; 401. First area; 402. Second area; 51. Embedded part; 511. First frosted layer; 512. Second through hole; 513. Second threaded hole; 501. First threaded hole; 502. First through hole; 52. Pressure strip plate; 521. Substrate; 522. Plastic plate; 5221. Second frosted layer; 53. Fastening bolt. Detailed Implementation

[0049] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0050] Example 1

[0051] like Figure 1 , Figure 10 and Figure 11 As shown, a photovoltaic sand-fixing device includes multiple rows of protective units. The distance between two adjacent rows of protective units is E, where 5m ≤ E ≤ 20m, and in this embodiment, E = 10m. Each row of protective units includes multiple protective units, each of which includes a photovoltaic panel 1, a support 2, a foundation pile 3, and a sand-fixing net 4. The foundation pile 3 is a cylindrical cement column, and its total height is H, where H = 4m in this embodiment. The lower end of the foundation pile 3 is buried in the desert to a certain depth, and the upper end of the foundation pile 3 is A above the ground, where 1m ≤ A ≤ 2m, and in this embodiment, A = 1.5m. Support 2 is connected to foundation pile 3. Support 2 is made of corrosion-resistant aluminum-magnesium-zinc coated steel. Photovoltaic panel 1 is connected to support 2. Thus, photovoltaic panel 1 is suspended in the desert through support 2 and foundation pile 3. Photovoltaic panel 1 is set at an angle. The lowest point of photovoltaic panel 1 is F from the ground, where F=2m. The working surface of photovoltaic panel 1 faces the sun. Photovoltaic panels 1 are connected to each other by cables and connected to a battery system (the cables and battery energy storage system are not shown in the figure. Existing photovoltaic power generation system cables and battery energy storage systems can be used).

[0052] like Figure 1 , Figure 4 , Figure 10 and Figure 11As shown, the distance between two adjacent foundation piles 3 in each row of protective units is D, where 2m ≤ D ≤ 5m. In this embodiment, D = 3m. The sand-fixing net 4 is connected to the foundation piles 3. The sand-fixing net 4 in each row of protective units is integrally connected to form a row. The sand-fixing net 4 is a rectangular net with a width of 0.8m (the width of the sand-fixing net 4 is the same as the height of the sand-fixing net 4 when it is set vertically). The sand-fixing net 4 is set vertically so that the plane on which the sand-fixing net 4 is located is perpendicular to the ground. The height of the upper end of the sand-fixing net 4 from the ground is B, where 0.5m ≤ B ≤ 1.5m. In this embodiment, B = 0.8m. Thus, the lower end of the sand-fixing net 4 is in contact with the ground. The sand-fixing net 4 is made of nylon material and has added anti-ultraviolet agents and anti-aging agents to improve wind erosion resistance and service life. The sand-fixing net 4 has a mesh with an average aperture, and the mesh aperture of the sand-fixing net 4 is C, where 0.1mm ≤ C ≤ 5mm. In this embodiment, C = 1.5mm. Sand-fixing netting 4 can reduce surface wind speed by 30%-50%, protect drought-resistant plants such as sea buckthorn and saxaul downwind, and reduce sand dune movement between downwind protection units, thereby reducing the erosion of photovoltaic panels and plants caused by sand dune movement.

[0053] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, the foundation pile 3 is provided with an embedded part 51, which is located directly behind the foundation pile 3. The embedded part 51 is a vertically arranged strip steel. The foundation pile 3 is provided with a steel cage 31 and a steel column 32. During the manufacturing of the foundation pile 3, the embedded part 51 is welded to the steel cage 31. Then the steel cage 31 and the steel column 32 are placed in the mold, with the main body of the embedded part 51 located outside the mold. Concrete is poured into the mold, and after curing, the foundation pile 3 with the embedded part 51 is demolded. The embedded part 51 is provided with multiple first threaded holes 501. In this embodiment, three first threaded holes 501 are provided. The three first threaded holes 501 are evenly distributed on the embedded part 51. Fastening bolts 53 are threadedly connected to the first threaded holes 501. The embedded part 51 is connected to the pressure plate 52 through the fastening bolts 53. The pressure plate 52 is a strip plate corresponding to the embedded part 51. The pressure plate 52 is provided with first through holes 502 corresponding to the first threaded holes 501. The pressure plate 52 presses the sand-fixing mesh 4 onto the corresponding embedded part 51. The fastening bolts 53 pass through the first through holes 502 and the sand-fixing mesh 4 and are connected to the first threaded holes 501. Tighten the three fastening bolts 53 on each embedded part 51, thereby using the pressure plate 52 to press the sand-fixing mesh 4 onto the embedded part 51, and complete the connection between the sand-fixing mesh 4 and the foundation pile 3. To improve the pressing effect on the sand-fixing mesh 4, the embedded part 51 is provided with a first frosted layer 511, which forms an uneven surface. The pressure strip 52 includes a base plate 521 and a plastic plate 522. The base plate 521 is made of galvanized steel plate to ensure the strength and rigidity of the pressure strip 52. The plastic plate 522 is made of nylon, such as nylon 66, and has a certain elasticity for contact with the sand-fixing mesh 4. The plastic plate 522 is provided with a second frosted layer 5221 corresponding to the first frosted layer 511. When the pressure strip 52 presses the sand-fixing mesh 4 onto the embedded part 51, the sand-fixing mesh 4 is located between the first frosted layer 511 and the second frosted layer 5221. Because the plastic plate 522 has a certain elasticity, it can effectively press the sand-fixing mesh 4 and reduce damage to the sand-fixing mesh 4, thereby improving the pressing effect and service life of the sand-fixing mesh 4.

[0054] like Figure 3 , Figure 5 , Figure 7 and Figure 8As shown, the sand-fixing mesh 4 has rolled edges 41 at both the top and bottom. The rolled edges 41 are formed by bending the mesh body at both the top and bottom of the sand-fixing mesh 4 inward a certain distance, and then using ultrasonic welding to fuse the bent end with the main body of the sand-fixing mesh 4 under local high temperature. A reinforcing rib 42 runs through the rolled edge 41. In this embodiment, the reinforcing rib 42 is made of galvanized iron wire, which can effectively resist the corrosion of the high salinity environment of the desert. The two ends of the reinforcing rib 42 are connected to the embedded part 51. The side of the embedded part 51 is provided with a second through hole 512 corresponding to the reinforcing rib 42. One end of the reinforcing rib 42 passes through the mesh hole on the side of the rolled edge 41, then passes through the second through hole 512 through the embedded part 51, bends back, and then twists together with the main body of the reinforcing rib 42. Figure 5 As shown in the diagram, this completes the connection between one end of the reinforcing rib 42 and the embedded part 51. The length of the reinforcing rib 42 can correspond to the distance D between two adjacent foundation piles 3, that is, both ends of a single reinforcing rib 42 are connected to two adjacent embedded parts 51 respectively, completing the reinforcement of a section of sand-fixing net 4. The length of the reinforcing rib 42 can also correspond to two or more D, completing the reinforcement of two or more sections of sand-fixing net 4. Setting the rolled edge 41 and the reinforcing rib 42 can improve the tensile strength of the sand-fixing net 4 and reduce the deformation or tearing of the sand-fixing net 4 due to wind. Multiple second through holes 512 are provided on the embedded part 51. Multiple second through holes 512 are distributed at equal intervals on the side of the embedded part 51, which is convenient for the use of sand-fixing nets 4 of different heights. The side of the embedded part 51 is also provided with a second threaded hole 513 corresponding to the second through hole 512. The second threaded hole 513 is used to connect the second bolt. The head of the second bolt is a certain distance from the side of the embedded part 51. When the reinforcing rib 42 passes through the second through hole 512, it can be wrapped around the bolt body of the second bolt, thereby completing the connection between the reinforcing rib 42 and the embedded part 51.

[0055] When the sand-fixing net 4 between two adjacent foundation piles 3 in a row of protective units is damaged (due to the influence of wind and sand, the sand-fixing net 4 may develop large holes or be torn after a period of use), the upper and lower reinforcing ribs 42 corresponding to the damaged net can be loosened, the sand-fixing net 4 between the two foundation piles 3 corresponding to the damaged net can be cut off, and a section of sand-fixing net 4 of the corresponding length can be taken again. After loosening the pressure strip plate 52, the new section of sand-fixing net 4 is pressed tightly onto the two embedded parts 51. After tightening the fastening bolts 53, the reinforcing rib 42 is re-penetrated through the rolled edge 41, and the reinforcing rib 42 is connected to the embedded part 51. Thus, the damaged sand-fixing net 4 can be replaced separately without replacing the entire row of sand-fixing net 4. The replacement is simple and low-cost.

[0056] This embodiment also provides a photovoltaic sand fixation method, which uses the above-mentioned photovoltaic sand fixation device and includes the following steps:

[0057] Step 1: Multiple rows of protective units are installed in the desert. Each row of protective units includes multiple foundation piles 3. The foundation piles 3 are driven into the desert ground. The foundation piles 3 are reserved at a height of A on the ground, where A = 1.5m. The photovoltaic panel 1 is connected to the foundation piles 3 through the bracket 2, so that the photovoltaic panel 1 is suspended in the air. The distance between two adjacent foundation piles 3 in each row of protective units is D, where D = 3m.

[0058] Multiple rows of protective units were installed in the Ulan Buh Desert. The Ulan Buh Desert has an arid climate with an average annual temperature of 7.6℃, a wind speed of 3.4 m / s, and an evaporation rate of 2327 mm. Northwesterly winds prevail, causing severe sandstorms and frequent strong winds, reaching 12.5 days per year. The average annual precipitation is 145 mm, the average July temperature is 21.8℃, and the extreme maximum temperature is 41.1℃. After the installation of the multiple rows of protective units, photovoltaic panel 1 faces south, with a tilt angle of 38.5°.

[0059] Step 2: Unroll the rolled sand-fixing net 4 along a row of protective units. The height of the top of the sand-fixing net 4 from the ground is B, where B = 0.8m.

[0060] The customized sand-fixing net 4 with rolled edges 41 is rolled up. During installation, the rolled sand-fixing net 4 is unfolded along a row of protective units. The sand-fixing net 4 is set vertically, with one side close to the foundation pile 3 and the other side attached to the embedded part 51.

[0061] Step 3: Use the pressure strip 52 to press the sand-fixing net 4 corresponding to the embedded part 51 onto the embedded part 51. Connect the embedded part 51 with the fastening bolt 53 through the pressure strip 52 and the sand-fixing net 4. Multiple pressure strips 52 are distributed to press the sand-fixing net 4 onto the embedded parts 51 of multiple protection units.

[0062] The pressure strip 52 presses the sand-fixing mesh 4 onto the embedded part 51 from the other side. When the fastening bolt 53 passes through the sand-fixing mesh 4, it breaks part of the mesh body and connects to the first threaded hole 501. Tighten the fastening bolt 53. Since the mesh body of the sand-fixing mesh 4 is located between the first frosted layer 511 and the second frosted layer 5221, the plastic plate 522 presses the mesh body of the sand-fixing mesh 4 onto the embedded part 51 and causes little damage to the mesh body of the sand-fixing mesh 4. The pressure strip 52 and the embedded part 51 use the strip-shaped surface to fix the sand-fixing mesh 4.

[0063] Step 4: Pass the reinforcing bar 42 through the rolled edge 41 of the sand-fixing net 4 between two adjacent foundation piles 3, and fix both ends of the reinforcing bar 42 to the embedded part 51;

[0064] One end of the reinforcing rib 42 passes through the rolled edge 41, then through the second through hole 512, bends back, wraps around the pressure strip 52, and is rolled around the body of the reinforcing rib 42, thus completing the connection with the embedded part 51. The sand-fixing net 4 between two adjacent foundation piles 3 in each row of protective units is reinforced by the reinforcing rib 42.

[0065] Step 5: Repeat steps 2 to 4 until all rows of protective units are covered with sand-fixing netting 4;

[0066] Step 6: Plant plants between the multiple rows of protective units;

[0067] Four-winged quinoa (salt-tolerant and shade-tolerant) is planted under the photovoltaic panels, and Haloxylon ammodendron (drought-tolerant, with an average annual growth height of 30cm) is planted between the panels, with a plant spacing of 1.5m and a row spacing of 4m. The drip irrigation system is driven by photovoltaic power.

[0068] Example 2

[0069] Unlike Example 1, the width of the sand-fixing net 4 in this example is 1.2m, and the height of the upper end of the sand-fixing net 4 from the ground is B, where B = 1.2m in this example. A comparison of the sand-fixing net effects of Examples 1 and 2 is shown in Table 1.

[0070] Table 1 Comparison of Sand Fixation Net Effects

[0071]

[0072] Conclusion: When the height of the sand-fixing net is 0.8m, the dune movement rate in the planting area drops to 0.3m / year, and the plant survival rate increases to 80% (the survival rate in the area without sand-fixing net is only 35%). When the height of the sand-fixing net is 1.2m, the near-ground wind speed is further reduced, but the cost increases by 25%, making it suitable for areas with strong winds.

[0073] Example 3

[0074] like Figure 12As shown, unlike Embodiment 1, this embodiment of the sand-fixing net 4 includes two mesh sizes. The sand-fixing net 4 includes a first region 401 and a second region 402. The first region 401 is located below the sand-fixing net 4, and the second region 402 is located above the sand-fixing net 4. The height of both the first region 401 and the second region is 0.4 meters. The mesh size of the first region is C1, where 0.1 mm ≤ C1 ≤ 1 mm. In this embodiment, C1 = 0.5 mm. The mesh size of the second region is C2, where 1 mm ≤ C2 ≤ 5 mm. In this embodiment, C2 = 1.5 mm, and C1 ≤ C2. This embodiment sets two mesh sizes. Since the movement of sand particles is mainly by jumping and creeping, and the main height is concentrated within 30 cm of the ground, the smaller mesh size at the bottom can effectively block these sand particles and prevent them from penetrating the sand barrier. The upper part of the sand-fixing net mainly faces suspended material and high-speed airflow. The larger mesh size allows the airflow to pass through smoothly, preventing the sand-fixing net from tilting or tearing due to excessive wind pressure. Small-aperture mesh can significantly increase surface roughness, creating a stronger wind speed gradient near the ground, causing sand particles to accumulate rapidly in front of the sand barrier and gradually stabilize the shifting sand; large-aperture mesh can filter suspended sand particles at high altitudes (above 0.4 meters in this embodiment), but allows fine dust to pass through, preventing the top of the sand-fixing mesh from tipping over due to excessive sand accumulation.

[0075] Example 4

[0076] like Figure 13 As shown, unlike Example 1, the sand-fixing net 4 in this example includes multiple mesh sizes, with the mesh size gradually increasing from bottom to top. By setting a gradually changing mesh size, the sand particles intercepted at the bottom will accumulate on the windward side of the sand-fixing net, gradually forming a stable sand embankment, enhancing the anchoring effect of the sand-fixing net. The upper part guides fine sand, extending its service life, achieving an efficient and long-lasting sand-fixing effect. The small mesh size at the bottom stabilizes the foundation, while the large mesh size at the top reduces wind load, making the overall structure of the sand-fixing net more wind-resistant and less prone to collapse.

[0077] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A photovoltaic sand-fixing device, characterized in that, The system includes multiple protective units, each comprising a photovoltaic panel (1), a bracket (2) connected to the photovoltaic panel (1), a foundation pile (3) connected to the bracket (2), and a sand-fixing mesh (4) connected to the foundation pile (3). The sand-fixing mesh (4) has various mesh sizes, with the mesh size gradually increasing from bottom to top. The foundation pile (3) is provided with an embedded part (51), and a pressure strip (52) is connected to the embedded part (51). The pressure strip (52) presses the sand-fixing mesh (4) onto the embedded part (51), and the embedded part (51) is connected to the pressure strip by fastening bolts (53). The plate (52) is connected, and the pressure strip plate (52) is provided with a first through hole (502) corresponding to the fastening bolt (53). The embedded part (51) is provided with a first frosted layer (511). The pressure strip plate (52) includes a base plate (521) and a plastic plate (522). The plastic plate (522) is provided with a second frosted layer (5221) corresponding to the first frosted layer (511). The upper and lower ends of the sand-fixing mesh (4) are respectively provided with rolled edges (41). A reinforcing rib (42) runs through the rolled edge (41). The side of the embedded part (51) is provided with a second through hole (512) corresponding to the reinforcing rib (42).

2. The photovoltaic sand-fixing device according to claim 1, characterized in that, The height of the upper end of the foundation pile (3) from the ground is A, 1m≤A≤2m, the height of the upper end of the sand-fixing net (4) from the ground is B, 0.5m≤B≤1.5m, and the distance between two adjacent rows of protection units in the multi-row protection unit is E, 5m≤E≤20m.

3. The photovoltaic sand-fixing device according to claim 1, characterized in that, The mesh size of the sand-fixing net (4) is C, where 0.1mm ≤ C ≤ 5mm.

4. A photovoltaic sand fixation method, characterized in that, The photovoltaic sand-fixing device according to any one of claims 1-3 includes the following steps: Step 1: Multiple rows of protective units are installed in the desert. Each row of protective units includes multiple foundation piles (3). The foundation piles (3) are driven into the desert ground. The foundation piles (3) are reserved at a height of A on the ground, where 1m≤A≤2m. The photovoltaic panel (1) is connected to the foundation piles (3) through a bracket (2), so that the photovoltaic panel (1) is suspended in the air. The distance between two adjacent foundation piles (3) in each row of protective units is D, where 2m≤D≤5m. Step 2: Unroll the rolled sand-fixing net (4) along a row of protective units. The height of the top of the sand-fixing net (4) from the ground is B, 0.5m≤B≤1.5m; Step 3: Use pressure strips (52) to press the sand-fixing net (4) corresponding to the embedded part (51) onto the embedded part (51), and connect the pressure strips (52) and the sand-fixing net (4) to the embedded part (51) by fastening bolts (53). Multiple pressure strips (52) press the sand-fixing net (4) onto the embedded parts (51) of multiple protection units respectively. Step 4: Pass the reinforcing bar (42) through the rolled edge (41) of the sand-fixing net (4) between two adjacent foundation piles (3), and fix both ends of the reinforcing bar (42) to the embedded part (51); Step 5: Repeat steps 2 to 4 until all rows of protective units are covered with sand-fixing netting (4). Step 6: Plant plants between the multiple rows of protective units.

Images