Drainage and soil fixation system for retention wall type sloping field photovoltaic field

Abstract

The invention discloses a drainage and soil fixation system of a retention wall type sloping field photovoltaic field, and relates to the technical field of photovoltaic field drainage structures, the drainage and soil fixation system comprises a sloping field photovoltaic field, a drainage channel is arranged on the low-terrain side of the sloping field photovoltaic field, and a transverse main retention wall and a longitudinal secondary retention wall are arranged on the surface of the sloping field photovoltaic field; the main water retaining wall and the secondary water retaining wall are in a criss-cross grid shape, an overflowing notch is reserved in the end, close to the main water retaining wall, of the secondary water retaining wall, the main water retaining wall and the secondary water retaining wall are provided with sand blocking walls at the overflowing notch, and the main water retaining wall and the secondary water retaining wall are connected into a whole underground through the sand blocking walls. And a soil fixation grid is arranged on the surface of the slope photovoltaic field area and between the grid-shaped main retention wall and the grid-shaped secondary retention wall. The surface runoff is separated and guided through the retention wall system, and the natural overflowing and underground seepage capacity of a site is fully utilized, so that the effects of reducing water and soil loss of the site and reducing the cost of a drainage system are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of drainage structures for photovoltaic fields, and in particular to a drainage and soil consolidation system for a photovoltaic field on a slope with a retaining wall. Background Art

[0002] Photovoltaic power generation sites can be distributed in vast fields. Under the premise of minimizing environmental modification, the modification of terrain is generally minimized as much as possible, which will result in the site of photovoltaic installation being a natural slope. In the sloped site, drainage and soil consolidation are one of the most important aspects of slope photovoltaic design, especially in areas with loose soil and abundant rainwater. Heavy rainfall brings rainwater to the slope and gathers into surface runoff. Under the action of gravity, it continues to accelerate and continuously carries away surface sediments, forming gullies on the runoff path. If not controlled, the gullies will continue to expand and deepen, eventually leading to the instability and damage of the photovoltaic bracket.

[0003] In view of the above situation, the traditional drainage design generally chooses to add drainage ditches inside the photovoltaic sub-array, so that most of the rainwater falls directly into the drainage ditches from the gaps between the photovoltaic panels, and then collects in the main drainage ditch outside the sub-array. However, this arrangement has the following disadvantages: first, the wetted perimeter and roughness of the drainage ditches are lower than the original ground, the flow velocity is accelerated, the runoff collection time is reduced, the rainfall intensity per unit time is increased, the peak flow of surface runoff is increased, and the cross-sectional size of the drainage ditch is increased. When the area of ​​the sub-array reaches a certain extent, the photovoltaic bracket may even need to be set in the drainage ditch, which is not conducive to structural safety; second, the drainage ditch has a large amount of civil engineering and a long construction period, which affects the construction of photovoltaic brackets and the installation of components; third, the drainage ditch is lower than the original ground, and the sediment on the surface of the sub-array is easily carried away by the water flow, causing soil erosion and affecting the natural environment. To overcome the above disadvantages, we propose a drainage and soil consolidation system for a retaining wall-type slope photovoltaic field. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that traditional drainage design for sloping photovoltaic fields in areas with loose soil and abundant rainfall has large civil engineering workload, is not conducive to construction organization, and causes serious soil and water loss.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a water retaining wall type slope photovoltaic field drainage and soil consolidation system, which adopts the following technical solutions:

[0006] A drainage and soil consolidation system for a slope photovoltaic field with a retaining wall type includes a slope photovoltaic field, a drainage ditch is arranged on the side of the slope photovoltaic field with a lower terrain, a transverse main water retaining wall and a longitudinal secondary water retaining wall are arranged on the surface of the slope photovoltaic field, the main water retaining wall and the secondary water retaining wall are in a criss-cross grid shape, and the main water retaining wall extends from the drainage ditch to the other side of the slope photovoltaic field with a higher terrain, a flow gap is reserved at one end of the secondary water retaining wall close to the main water retaining wall, a sand retaining wall is arranged at the flow gap of the main water retaining wall and the secondary water retaining wall, the sand retaining wall is connected to the main water retaining wall and the secondary water retaining wall into a whole underground, and a soil consolidation grid is arranged on the surface of the slope photovoltaic field between the grid-shaped main water retaining wall and the secondary water retaining wall.

[0007] Furthermore, the flow gaps of the same main retaining wall are connected to form a flow channel, and an anti-scour bottom protection is provided at the top of the slope photovoltaic field area at the flow channel.

[0008] Furthermore, the width of the anti-scour bottom protection is greater than the width of the flow channel.

[0009] Furthermore, the anti-scour bottom protection is divided into a lower small-grained stone layer and an upper large-grained block stone layer.

[0010] Furthermore, the bottoms of the main water retaining wall and the secondary water retaining wall are buried below the ground, and the tops are above the ground, and the top of the secondary water retaining wall is flush with the top of the main water retaining wall that is adjacent to it through the flow gap.

[0011] Furthermore, the elevation of the sand retaining wall is equal to or slightly greater than the elevation of the ground of the photovoltaic field in the slope, and along the same main retaining wall with the drainage channel as the starting point, the top elevation of the sand retaining wall is higher than the bottom elevation of the adjacent sand retaining wall.

[0012] Furthermore, the soil-fixing grid is a fiber-woven fishing net-like structure laid flat between the main retaining wall and the secondary retaining wall.

[0013] In summary, the present invention has the following beneficial effects:

[0014] The present invention increases the slope roughness of the photovoltaic site, reduces the surface runoff velocity, prolongs the runoff collection time, and reduces the runoff peak flow rate through the combined arrangement of the soil-fixing grid, the main water retaining wall and the secondary water retaining wall; adopts an open water retaining wall instead of a closed drainage channel, retains the channel for runoff infiltration, and part of the surface runoff is converted into underground seepage, which reduces the runoff peak flow rate and further reduces the civil engineering workload of the drainage system; limits the surface runoff to only be collected along the secondary water retaining wall and the main water retaining wall, and reduces the anti-scouring range from the entire site to the reserved drainage channel; the secondary water retaining wall and the main water retaining wall successively block the runoff twice, which reduces the runoff velocity in the reserved drainage channel, reduces the requirements for anti-scouring protection, and reduces soil and water loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the figure:

[0017] 1. Main retaining wall; 2. Secondary retaining wall; 3. Sand retaining wall; 4. Soil consolidation grid; 5. Protective brush bottom protection; 6. Drainage ditch; 10. Slope photovoltaic field area. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 The present invention is described in further detail.

[0019] Please refer to the attached figure in the instruction manual Figure 1 The present invention provides an embodiment: a water retaining wall type drainage and soil consolidation system for a slope photovoltaic field, comprising a slope photovoltaic field 10, a drainage channel 6 is arranged on the lower side of the slope photovoltaic field 10, a transverse main water retaining wall 1 and a longitudinal secondary water retaining wall 2 are arranged on the surface of the slope photovoltaic field 10, the main water retaining wall 1 and the secondary water retaining wall 2 are in a criss-cross grid shape, and the main water retaining wall 1 extends from the drainage channel 6 as the starting point to the other side of the slope photovoltaic field 10 with a higher terrain, the main water retaining wall 1 divides the slope photovoltaic field 10 into independent drainage basins, and the main water retaining wall 1 and the secondary water retaining wall 2 divide the slope photovoltaic field 10 into independent water collection units. A flow gap is reserved at one end of the secondary water retaining wall 2 close to the main water retaining wall 1. Each water collection unit is drained through the flow gap. The bottoms of the main water retaining wall 1 and the secondary water retaining wall 2 are buried below the ground, and the tops are above the ground. The top of the secondary water retaining wall 2 is flush with the top of the main water retaining wall 1 close to the flow gap. The main water retaining wall 1 and the secondary water retaining wall 2 are provided with a sand retaining wall 3 at the flow gap. The sand retaining wall 3 connects the main water retaining wall 1 and the secondary water retaining wall 2 into a whole underground. The surface of the slope photovoltaic field 10 is located between the grid-shaped main water retaining wall 1 and the secondary water retaining wall 2 and is provided with a soil fixing grid 4.

[0020] The flow gaps of the same main retaining wall 1 are connected to form a flow channel. The top of the slope photovoltaic field 10 is located at the flow channel and is provided with an anti-scour bottom protection 5. The width of the anti-scour bottom protection 5 is greater than the width of the flow channel. The anti-scour bottom protection 5 is divided into a lower layer of small-grained stone layers and an upper layer of large-grained block stones. The accumulated water in each independent drainage basin is discharged into the drainage channel 6 through the flow channel. The stratification of the anti-scour bottom protection 5 and the width of the anti-scour bottom protection 5 being kept greater than the width of the flow channel can make the area where the runoff flows be located above the anti-scour bottom protection 5, which has good anti-filtration performance while reducing the runoff from carrying away the sediment at the bottom of the flow channel.

[0021] The elevation of the sand retaining wall 3 is equal to or slightly greater than the elevation of the ground of the slope photovoltaic field 10 , and along the same main retaining wall 1 with the drainage channel 6 as the starting point, the top elevation of the sand retaining wall 3 is higher than the bottom elevation of the adjacent sand retaining wall 3 .

[0022] The soil-fixing grid 4 is a fiber-woven fishing net-like structure laid flat between the main water retaining wall 1 and the secondary water retaining wall 2 .

[0023] In summary, when designing drainage and soil consolidation for the slope photovoltaic field, a drainage channel 6 is set on the lower side of the slope photovoltaic field 10, and a transverse main water retaining wall 1 and a longitudinal secondary water retaining wall 2 are set on the surface of the slope photovoltaic field 10. The bottoms of the main water retaining wall 1 and the secondary water retaining wall 2 are buried below the ground, and the tops are above the ground, and the top of the secondary water retaining wall 2 is flush with the top of the main water retaining wall 1 close to it through the flow gap. In order to facilitate construction in the photovoltaic field, the main water retaining wall 1 is generally arranged at the maximum ground clearance of the photovoltaic panel bracket or between two photovoltaic modules. The main water retaining wall 1 can be made of impermeable materials, such as concrete, plastic baffles, etc.

[0024] The main water retaining wall 1 and the secondary water retaining wall 2 are in a criss-cross grid shape, and the main water retaining wall 1 extends from the drainage channel 6 to the other side of the slope photovoltaic field 10 with higher terrain. The main water retaining wall 1 divides the slope photovoltaic field 10 into independent drainage basins, and the runoff of each drainage basin is guided by the main water retaining wall 1 to the drainage channel 6 on the low side, ensuring that the absolute height difference between each drainage basin is limited, the kinetic energy of the water flow in adjacent drainage basins cannot be accumulated, and the runoff speed is reduced. The main water retaining wall 1 and the secondary water retaining wall 2 divide the slope photovoltaic field area 10 into independent water collection units. The secondary water retaining wall 2 is provided with a flow gap at one end close to the main water retaining wall 1. Each water collection unit is drained through the flow gap to avoid the direct accumulation of kinetic energy of water in adjacent water collection units. The rainwater in each water collection unit flows along the slope and completes the first energy dissipation after hitting the secondary water retaining wall 2; and is collected into runoff, and turns to move along the secondary water retaining wall 2 toward the main water retaining wall 1. When it reaches the flow channel, it collides with the runoff in the flow channel on the one hand, and collides with the main water retaining wall 1 on the other hand, completing the second energy dissipation. The secondary water retaining wall 2 can be made of impermeable materials, such as concrete, plastic baffles, etc.

[0025] The main water retaining wall 1 and the secondary water retaining wall 2 are provided with a sand retaining wall 3 at the flow gap. The sand retaining wall 3 connects the main water retaining wall 1 and the secondary water retaining wall 2 into a whole underground. The elevation of the sand retaining wall 3 is equal to or slightly greater than the elevation of the ground of the slope photovoltaic field 10 at that location. And along the same main water retaining wall 1, starting from the drainage channel 6, the top elevation of the sand retaining wall 3 is higher than the bottom elevation of the adjacent sand retaining wall 3. In the event of extreme rainfall, the water flow upstream of the sand retaining wall 3 will roll violently and carry away some silt. The sand retaining wall 3 will be exposed to the ground and form a small sedimentation pool in front of the sand retaining wall 3. When the rainfall intensity and runoff speed decrease, most of the upstream silt will be intercepted and silted by the sand retaining wall 3. Therefore, the sand retaining wall 3 has a good self-repairing ability, which can ensure that the upstream scouring will not continue to deepen. Structurally, along the same main retaining wall 1, starting from the drainage channel 6, the top elevation of the sand retaining wall 3 is higher than the bottom elevation of the adjacent sand retaining wall 3, so that even if erosion occurs downstream of the current level of sand retaining wall 3, the mud surface after erosion is flush with the top of the next level of sand retaining wall 3, and the current level of sand retaining wall 3 can always maintain a sufficient burial depth below the mud surface to avoid instability and damage. The sand retaining wall 3 can be made of materials such as concrete and plastic baffles.

[0026] The top of the slope photovoltaic field 10 is provided with an anti-scour protection bottom 5 at the flow channel. The width of the anti-scour protection bottom 5 is greater than the width of the flow channel. The anti-scour protection bottom 5 is divided into a lower layer of small-grained stone and an upper layer of large-grained block stone. The accumulated water in each independent drainage basin is discharged into the drainage channel 6 through the flow channel. The stratification of the anti-scour protection bottom 5 and the width of the anti-scour protection bottom 5 being kept greater than the width of the flow channel can make the area through which the runoff flows be located above the anti-scour protection bottom 5, which has good anti-filtration performance while reducing the runoff carrying away the sediment at the bottom of the flow channel.

[0027] The surface of the slope photovoltaic field 10 is located between the grid-shaped main water retaining wall 1 and the secondary water retaining wall 2, and a soil-fixing grid 4 is arranged. It is laid flat in each water collection unit divided by the main water retaining wall 1 and the secondary water retaining wall 2, and is woven from natural or artificial fibers, such as coconut fiber, straw fiber, jute fiber, polypropylene, etc.

[0028] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water retaining wall type drainage and soil consolidation system for a slope photovoltaic field, comprising a slope photovoltaic field (10), characterized in that: A drainage channel (6) is arranged on the lower side of the slope photovoltaic field (10); a transverse main water retaining wall (1) and a longitudinal secondary water retaining wall (2) are arranged on the surface of the slope photovoltaic field (10); the main water retaining wall (1) and the secondary water retaining wall (2) are arranged in a crisscross grid shape; the main water retaining wall (1) extends from the drainage channel (6) to the other side of the slope photovoltaic field (10) with a higher terrain; a flow gap is reserved at one end of the secondary water retaining wall (2) close to the main water retaining wall (1); a sand retaining wall (3) is arranged at the flow gap between the main water retaining wall (1) and the secondary water retaining wall (2); the sand retaining wall (3) connects the main water retaining wall (1) and the secondary water retaining wall (2) into a whole underground; and a soil fixing grid (4) is arranged on the surface of the slope photovoltaic field (10) between the grid-shaped main water retaining wall (1) and the secondary water retaining wall (2).

2. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field area according to claim 1 is characterized by: The flow gaps of the same main retaining wall (1) are connected to form a flow channel, and an anti-scouring bottom protection (5) is provided at the top of the slope photovoltaic field area (10) at the flow channel.

3. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field area according to claim 2 is characterized by: The width of the anti-scour bottom protection (5) is greater than the width of the flow passage.

4. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field area according to claim 2 is characterized by: The anti-scour bottom protection (5) is divided into a lower layer of small-grained stone layers and an upper layer of large-grained block stones.

5. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field area according to claim 1 is characterized by: The bottoms of the main water retaining wall (1) and the secondary water retaining wall (2) are both buried below the ground, and the tops are both above the ground, and the top of the secondary water retaining wall (2) is flush with the top of the main water retaining wall (1) that is adjacent to the main water retaining wall through the flow gap.

6. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field area according to claim 1, characterized in that: The elevation of the sand retaining wall (3) is equal to or slightly greater than the elevation of the ground of the photovoltaic field (10) on the slope, and along the same main retaining wall (1) with the drainage channel (6) as the starting point, the top elevation of the sand retaining wall (3) is higher than the bottom elevation of the adjacent sand retaining wall (3).

7. The drainage and soil consolidation system for a water retaining wall type slope photovoltaic field according to claim 1, characterized in that: The soil-fixing grid (4) is a fiber-woven fishing net-like structure laid flat between the main water retaining wall (1) and the secondary water retaining wall (2).

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