Flexible fitting structure suitable for scour prevention of sandy soil photovoltaic field area
By combining a flexible geotextile, HDPE geogrid, and pebble layer, the problem of erosion prevention in sandy soil photovoltaic fields is solved, achieving a balance between high-efficiency erosion resistance and ecological protection, adapting to different terrains, and reducing construction difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-01
AI Technical Summary
Existing technologies for erosion prevention in sandy soil photovoltaic fields have insufficient terrain adaptability, cannot simultaneously achieve terrain fit and erosion resistance, have low construction efficiency, and have a negative impact on the ecological environment.
The system employs a flexible bonding structure, comprising geotextile, modified HDPE geogrid, and a pebble layer. By setting gaps at the intersections of the geogrid to allow for local bending, the geotextile isolates sand and soil erosion, while the pebble layer disperses the impact of water flow, forming a multi-layered synergistic protection.
It significantly reduces soil erosion rate, improves protection efficiency, maintains natural surface permeability and vegetation growth conditions, reduces construction difficulty and cost, and adapts to different terrains.
Smart Images
Figure CN224186817U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical engineering protection technology, and in particular to a flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic fields. Background Technology
[0002] Due to the loose surface and low interparticle cohesion of sandy soil photovoltaic fields, these areas are highly susceptible to soil erosion during heavy rainfall. This erosion can lead to exposed photovoltaic support foundations, equipment tilting, and even collapse, severely impacting the stable operation of the photovoltaic power station. Common erosion control technologies include concrete lining, ordinary geogrids, and grass planting, but each method has its own limitations in practical applications.
[0003] Concrete lining: While it can effectively prevent water erosion of sandy soil, it has a long construction period, high cost, and damages the natural permeability of the soil and the conditions for vegetation growth, which is detrimental to ecological environmental protection. In addition, due to the thermal expansion and contraction characteristics of sandy soil, concrete lining is prone to cracking, leading to localized protection failure.
[0004] Ordinary geogrids: As a commonly used reinforcement material, ordinary geogrids perform well in enhancing the tensile strength of soil. However, due to their planar rigid structure, they have poor terrain adaptability and are prone to creating gaps in uneven terrain, which may exacerbate local erosion. Furthermore, their small contact area with sand makes it difficult to trap loose sand particles, potentially leading to sand loss under water flow. Long-term exposure to the external environment also makes them prone to aging, affecting their service life.
[0005] Planting grass: As an eco-friendly method of erosion control, it reduces soil erosion by using the root system of vegetation to stabilize the soil. However, this method is not very effective initially and requires time to establish effective protection; moreover, the maintenance cost is high, requiring regular watering, fertilization, and pruning. In addition, due to the poor water and fertilizer retention capacity of sandy soil, the survival rate of vegetation is low, making it particularly difficult to promote in arid areas. Furthermore, excessive weed growth may also affect power generation efficiency.
[0006] In summary, the above-mentioned technical methods are not adaptable to the terrain and cannot simultaneously achieve terrain fit and erosion resistance, resulting in low construction efficiency. Therefore, effective technical methods are needed to solve the problem of soil erosion caused by rainfall on the surface of sandy soil photovoltaic fields. Utility Model Content
[0007] The technical problem to be solved by this utility model is: to provide a flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic fields, in view of the above-mentioned problems.
[0008] The technical solution adopted in this utility model is: a flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic field areas, comprising:
[0009] Geotextiles are laid on sandy soil surfaces;
[0010] Geogrids are fixed to the upper surface of geotextiles by fasteners. The main body has a mesh structure. There are notches at any intersection of the horizontal and vertical lines on the surface of the geogrid, so that it can be bent locally to adapt to the uneven areas of the sandy soil surface and prevent local scouring.
[0011] The pebble layer is laid inside the mesh of the geogrid, with its top flush with the top of the geogrid.
[0012] By employing the aforementioned technical means, geotextiles and geogrids are used, replacing traditional rigid concrete lining with flexible materials. This preserves the natural permeability of the ground surface and does not block the exchange of water and air between the soil and the outside world. Furthermore, by setting gaps at the intersections of the geogrids, the geogrids can be bent locally to adapt to uneven areas of the ground surface, reducing the area of overhead structures. By combining geotextiles to isolate sand and soil erosion and gravel layers to disperse the impact of water flow, the overall structure's erosion resistance is enhanced.
[0013] In some embodiments, the geogrid is thickened in the middle to form the main reinforcement, and the notch is triangular or inverted trapezoidal in shape.
[0014] In some embodiments, the geogrid is made of HDPE material, and the selection parameters of the geogrid are: thickness 10cm, mesh size 20mm×20mm, and tensile strength ≥30kN / m.
[0015] In some embodiments, the selection parameter for the geotextile is a basis weight ≥ 200 g / m². 2 Permeability coefficient ≥1×10 - 2 cm / s.
[0016] In some embodiments, the geotextile is laid in a direction perpendicular to the water flow direction, and the overlap width between adjacent geotextile strips is ≥20cm.
[0017] In some embodiments, the fastener includes a U-shaped anchor nail with an anchoring spacing of ≤1m×1m and the U-shaped anchor nail being inserted into the sand to a depth of ≥15cm.
[0018] In some embodiments, the pebble layer is made of pebbles with a particle size of 20mm to 50mm, and the pebbles are filled into the mesh of the geogrid in batches, with compaction performed after each filling.
[0019] The beneficial effects of this utility model are:
[0020] 1. By setting notches at each intersection of the geogrid, local bending is allowed to conform to uneven areas of the ground surface. This flexible design reduces the amount of overhead work, lowering the risk of localized erosion failure caused by the overhead work of traditional rigid structures, and improving protection efficiency. Geotextile isolates soil erosion, geogrid enhances the tensile strength of the ground surface and locks in loose gravel, and the pebble layer disperses the impact of water flow. The synergistic effect of these three elements significantly reduces soil erosion. Simultaneously, the combination of geotextile and pebble layer ensures surface permeability. Compared to traditional concrete lining, it eliminates the need for surface hardening, preserving the natural permeability of the soil and conditions for vegetation growth, thus minimizing the impact on the ecological environment. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the planar structure of this application.
[0022] Figure 2 This is a schematic diagram of the longitudinal section structure of this application.
[0023] Figure 3 This is a longitudinal section of a geogrid that conforms to the terrain.
[0024] Figure 4 This is a longitudinal section of the geogrid when it is fitted to the slope.
[0025] Explanation of reference numerals in the attached figures:
[0026] 1. Geogrid; 2. Geotextile; 3. Gravel layer; 4. Main reinforcement.
[0027] This specification includes references to "one embodiment" or "implementation". The use of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.
[0028] The term "comprising" is open-ended. As used in the appended claims, it does not exclude additional structures or steps. Detailed Implementation
[0029] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.
[0030] Example 1:
[0031] Combination Figures 1 to 4As shown, this application discloses a flexible bonding structure suitable for erosion control in sandy soil photovoltaic fields, comprising geotextile 2, geogrid 1, and pebble layer 3. Geotextile 2 is laid on the sandy soil surface, and geogrid 1 is fixed to its upper surface via fasteners. The geogrid 1 has a mesh structure, with notches at any intersection of its horizontal and vertical axes, allowing for local bending to adapt to uneven areas of the sandy soil surface. The pebble layer 3 is laid within the mesh formed by the geogrid 1, with the top of the pebble layer 3 flush with the top of the geogrid 1.
[0032] In some implementation schemes, such as Figure 3 and Figure 4 As shown, the geogrid 1 is thickened in the middle to form the main reinforcement 4, and the structure of the gap at each cross intersection is triangular or inverted trapezoidal. Figure 3 Only a triangular structure is shown, with a depth of 3mm and a maximum width of 5mm, allowing the geogrid 1 ribs to be partially bent with a maximum bending angle of 30°, thus adapting to uneven ground and reducing the overhead area. If laid on flat ground, the angle of the notch on the upper surface at the cross-section of the geogrid 1 is the same as the angle of the notch on the lower surface. If laid on a slope, ... Figure 4 The angle of the notch on the upper surface of the geogrid 1 at the intersection point is different from the angle of the notch on the lower surface to accommodate the slope inclination. Specifically, in this embodiment, the geogrid 1 is made of HDPE (high-density polyethylene) material, and the selection parameters for the geogrid 1 are: thickness 10cm, mesh size 20mm×20mm, and tensile strength ≥30kN / m.
[0033] In some implementation schemes, the selection parameter for geotextile 2 is a basis weight ≥ 200 g / m². 2 Permeability coefficient ≥1×10 -2 cm / s. The geotextile 2 is laid perpendicular to the water flow direction, which can more effectively disperse the force of the water flow and reduce direct erosion of the ground surface. The overlap width between adjacent geotextile 2 strips is ≥20cm. A larger overlap width can effectively prevent the gaps between geotextile 2 strips from widening due to water flow or other external forces, thereby preventing sand and soil from escaping through these gaps. This helps maintain the integrity and stability of the structure. Appropriate overlap not only increases the continuity of the geotextile 2 coverage area but also enhances the structural strength of the entire protective system.
[0034] In some implementation schemes, the pebble layer 3 is made of pebbles with a particle size of 20mm to 50mm, and the pebbles are filled into the mesh of the geogrid 1 in batches, and compaction is performed after each filling.
[0035] The fasteners include U-shaped anchors with an anchoring spacing of ≤1m×1m and an insertion depth of ≥15cm into the sand, ensuring a tight connection between the geogrid 1 and the geotextile 2 and improving overall stability.
[0036] The implementation principle of a flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic fields is as follows:
[0037] Notches are set at the intersections of the horizontal and vertical lines of the HDPE geogrid 1 to allow for local bending to adapt to the uneven areas of the sandy soil surface. This flexible and fitted design has good terrain adaptability and can effectively reduce the phenomenon of slabs being suspended.
[0038] This structure enhances erosion resistance while also prioritizing ecological protection. The combination of geotextile 2 and a pebble filling layer preserves the natural permeability of the ground surface. Compared to traditional concrete lining, it eliminates the need for surface hardening, supports rainwater infiltration and vegetation growth, and minimizes its impact on the ecological environment. Furthermore, the surface of the pebble layer 3 can be locally planted with grass, further consolidating the soil and enhancing the site's aesthetics, thus contributing to the ecological sustainability of the photovoltaic field.
[0039] A multi-layered synergistic protective structure is formed by combining geotextile 2, modified HDPE geogrid 1, and pebble layer 3. Geotextile 2 is used to isolate soil erosion, HDPE geogrid 1 enhances the tensile strength of the surface and locks in loose sand particles, and pebble layer 3 disperses the impact of water flow. The combination of the three can significantly reduce the soil erosion rate by more than 90%.
[0040] The modular design allows for installation without the need for large machinery, reducing construction difficulty and costs. In large-scale photovoltaic projects, the modular design enables rapid deployment, making it suitable for projects with tight deadlines.
[0041] Example 2:
[0042] This embodiment describes a construction method for a flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic fields. Applied to the flexible bonding structure for erosion prevention in sandy soil photovoltaic fields in Embodiment 1, the method includes the following steps:
[0043] S1. Surface treatment: The sandy soil surface is leveled and compacted to enhance foundation stability.
[0044] S1.1 Level the sandy soil surface by using a grader or manual tools to fill in uneven areas and ensure that the surface is free of significant undulations. Then, use a road roller or vibratory compactor to compact the surface to a degree of ≥85%.
[0045] S2. Lay geotextile 2. Select a suitable geotextile 2. When laying, keep it flat and perpendicular to the water flow direction. The overlap width between adjacent strips should be ≥20cm.
[0046] S2.1 Select a weight ≥ 200g / m³ 2Geotextile 2 with a permeability coefficient ≥1×10-2cm / s is laid on the leveled sandy soil surface. Geotextile 2 must be kept flat during laying, and the overlap width between adjacent strips should be ≥20cm. The laying direction of geotextile 2 should be perpendicular to the water flow direction to enhance the erosion resistance.
[0047] S3. Install HDPE geogrid 1 with the bottom notch facing down, ensuring that the inverted trapezoidal notch below each cross intersection is in contact with the ground surface. Use U-shaped anchor nails at 0.8m×0.8m intervals to fix the geogrid. The anchor nails must penetrate the geotextile 2 and be inserted into the sand to a depth of ≥15cm.
[0048] S3.1 Select HDPE geogrid 1 with a thickness of 10cm, a mesh size of 20mm×20mm, and a tensile strength ≥30kN / m. The geogrid is improved by thickening the middle as the main reinforcement 4, and adopting an inverted trapezoidal notch design at the cross intersection to allow local bending to adapt to the terrain.
[0049] S4. Fill with pebbles. Select pebbles with a particle size of 20-50mm and fill them into the mesh of HDPE geogrid 1 in two stages. First, fill to 50% of the height of the geogrid and compact the pebble layer 3 with a vibratory compactor to ensure a density of ≥85%. Second, fill to the top of the geogrid and compact again to ensure a smooth surface of the pebble layer 3.
[0050] S5. Acceptance Criteria: The effectiveness of the protective structure is verified through a water flushing test to simulate actual water flow impact conditions, ensuring that soil erosion is <5g / m³. 2 ·h.
[0051] S5.1. The gap between the bent area of the grid and the ground surface should be ≤2cm. A water flushing test should be conducted to simulate the impact of water flow at a velocity of 1.5m / s for 30 minutes. Observe whether there is any sand loss and record the test data to ensure that the soil loss is <5g / m³. 2 •h, thus ensuring that the amount of soil erosion is much lower than that of the single geotextile scheme 2 (usually >50g / m). 2 ·h).
[0052] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A flexible bonding structure suitable for erosion prevention in sandy soil photovoltaic fields, characterized in that, include: Geotextile (2) is laid on the sandy soil surface; Geogrid (1) is fixed on the upper surface of geotextile (2) by fasteners. The main body is a mesh structure. There is a notch at any cross-section of the surface of geogrid (1), so that it can be bent locally to adapt to the uneven area of sandy soil surface and prevent local scouring. The pebble layer (3) is laid inside the mesh of the geogrid (1), with its top flush with the top of the geogrid (1).
2. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The geogrid (1) is thickened in the middle to form the main reinforcement (4), and the structure of the notch is triangular or inverted trapezoidal.
3. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The geogrid (1) is made of HDPE material. The selection parameters of the geogrid (1) are: thickness 10cm, mesh size 20mm×20mm, and tensile strength ≥30kN / m.
4. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The selection parameter for the geotextile (2) is a basis weight ≥ 200 g / m². 2 Permeability coefficient ≥1×10 -2 cm / s.
5. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The geotextile (2) is laid in a direction perpendicular to the direction of water flow, and the overlap width between adjacent geotextile (2) is ≥20cm.
6. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The fastener includes U-shaped anchors with an anchoring spacing of ≤1m×1m and an insertion depth of ≥15cm into the sand.
7. The flexible bonding structure for erosion prevention in sandy soil photovoltaic fields according to claim 1, characterized in that: The pebble layer (3) is made of pebbles with a particle size of 20mm to 50mm, and the pebbles are filled into the mesh of the geogrid (1) in batches, and compaction is performed after each filling.