Plant fiber foamed cement-based sandstorm prevention system and sandstorm prevention method

Abstract

The application discloses a plant fiber foamed cement-based wind-sand protection system and a wind-sand protection method. The plant fiber foamed cement-based wind-sand protection system comprises a first protection structure, a second protection structure, a third protection structure and a fourth protection structure. The first protection structure comprises at least one double-stand type sand blocking structure. The double-stand type sand blocking structure comprises two stand type sand blocking walls which are sequentially and spacedly arranged on the ground along a selected direction. A movable sand fixing ball is arranged between the two stand type sand blocking walls. The second protection structure comprises at least one net covering assembly. The net covering assembly comprises a plurality of jacking balls and a net covering arranged on the upper surface of the jacking balls. The jacking balls are freely rolled on the sand surface. The net covering always keeps a fixed distance from the sand surface. The third protection structure comprises at least one sand sinking ditch which is used for capturing sand particles in the wind-sand flow. The fourth protection structure comprises at least one sand fixing afforestation covering plate which is used for inserting branches and sowing or planting seedlings.

Description

TECHNICAL FIELD

[0001] The present application relates to a plant fiber foamed cement-based wind-sand protection system and a wind-sand protection method, and belongs to the technical field of desert ecological environment management. BACKGROUND

[0002] The two major types of sand prevention measures currently widely used in engineering are sand blocking and sand fixation, which can be further divided into many types according to material and structure differences. For example, in terms of material, there are PE, wheat straw, reed, straw, stone, salt soil block, clay, and metal, etc., and in terms of structure, there are net-shaped, non-porous plate, punched plate, columnar, brush-shaped, louver-shaped, and other types of porous design. Sand blocking barriers are mainly laid vertically to the ground in the form of high vertical, curtain, and chessboard, etc., and sand fixation barriers are composed of various specifications of squares, triangles, circles, and fish scale structures. After years of research, the key indicators such as specification parameters, adaptation range, and protection effect of various sand barriers have been relatively perfected, but in the long-term engineering practice, we have found that the traditional sand blocking barriers, sand fixation squares, and sand sinking trenches have the following shortcomings.

[0003] Firstly, sand blocking barriers are generally set in multiple rows at a certain distance perpendicular to the main wind direction, the height of the sand barrier is generally 1.5-2 meters, and the protection distance is about 20 times the height of the barrier, so the distance between the sand barriers is 2050 meters or more. In actual application, sand accumulation zones will be generated on both sides of the sand barrier, and since the accumulated sand is continuously exposed to the airflow, part of the accumulated sand will be re-started and continue to be transported downwind, causing sand damage. Therefore, the traditional sand blocking barrier has the shortcomings of less accumulated sand and the inability to fix the accumulated sand zone.

[0004] Secondly, sand fixation measures generally cannot be improved, and when the sand fixation squares are filled with flowing sand, the sand particles will be transported downwind in the form of overland wind and sand flow, causing sand burial hazards to the protected objects. Therefore, it is generally believed that the sand fixation effect of the sand fixation squares is weak after they are filled with flowing sand. The net covering measures are laid close to the ground surface and play a role in inhibiting the in-situ sand and dust from being started and fixing the in-situ sand, but they have no fixing effect on the flowing sand transported from a distance.

[0005] In addition, the top surface of the sand sinking trench is generally open and exposed to the airflow, so the flowing sand deposited in the trench is easy to be re-started and transported downwind, causing damage.

[0006] Therefore, in order to solve the shortcomings of the above-mentioned protection measures in actual application, a plant fiber foamed cement-based wind-sand protection system is developed, which is suitable for high-intensity wind-sand flow areas and can rely on natural wind power for a long time to block and fix most of the overland flowing sand, thereby reducing the wind-sand hazards. SUMMARY

[0007] In view of the shortcomings of the prior art, the purpose of the present application is to provide a plant fiber foamed cement-based wind-sand protection system and a wind-sand protection method.

[0008] To achieve the aforementioned technical purposes, the technical scheme adopted by the present application comprises:

[0009] The present application discloses a plant fiber foamed cement-based sandstorm protection system, which comprises a first protection structure, a second protection structure, a third protection structure and a fourth protection structure arranged in sequence along a selected direction.

[0010] The first protection structure comprises at least one double upright sand blocking structure, which comprises two upright sand blocking walls arranged in sequence along a selected direction on the ground, and a mobile sand fixing ball arranged between the two upright sand blocking walls.

[0011] The second protection structure comprises at least one net covering assembly, which comprises a plurality of jacking balls and a net covering the upper surface of the jacking balls.

[0012] The third protection structure comprises at least one sand sinking ditch, which is arranged underground and is used for capturing sand particles in the sand flow.

[0013] The fourth protection structure comprises a sand fixing and afforestation covering plate, which comprises at least one first covering plate and at least one second covering plate.

[0014] The upright sand blocking wall, the mobile sand fixing ball, the jacking ball and the sand sinking ditch are all made of plant fiber foamed cement-based material.

[0015] Further, the distance between the first protection structure, the second protection structure and the third protection structure is 5-30m.

[0016] Further, the distance between the two adjacent upright sand blocking walls is 2-5m.

[0017] Further, a plurality of through holes are arranged on the upright sand blocking wall, and the diameter of the through holes is 520cm, and the wall porosity is 20-40%.

[0018] Further, a stand column for fixing the upright sand blocking wall is arranged on one side of the upright sand blocking wall.

[0019] Furthermore, the height of the column ranges from 2 to 4 meters, the thickness is 20 to 40 centimeters, and the burial depth is 0.5 to 1 meter.

[0020] Furthermore, the movable sand-fixing balls are solid and have a diameter of 20-50cm.

[0021] Furthermore, the netting assembly also includes a connecting rope that connects the netting to the lifting ball.

[0022] Furthermore, a fixing ring is provided on the lifting ball, and the two ends of the connecting rope are fixedly connected to the fixing ring and the covering net, respectively.

[0023] Furthermore, the netting assembly also includes a sliding ring and a vertical pole. The sliding ring is fixedly connected to the netting and is sleeved on the vertical pole, which is fixed to the ground.

[0024] Furthermore, the diameter of the lifting ball is 20-50cm.

[0025] Furthermore, the distance between adjacent lifting balls is 30-150cm.

[0026] Furthermore, the porosity of the covering mesh is 20-40%.

[0027] Furthermore, the height of the uprights protruding from the sand surface is 0.5-3m.

[0028] Furthermore, the second protective structure includes multiple netting components, wherein in the selected direction, the width of the netting components is 5-50m, and the spacing between two adjacent netting components is 5-25m.

[0029] Furthermore, the cross-section of the sedimentation ditch is trapezoidal.

[0030] Furthermore, the upper width of the sedimentation ditch is 2-4m, the lower width is 1-3m, and the depth is 1-3m.

[0031] Furthermore, the grooves on the first cover plate are semi-circular or semi-elliptical; the grooves on the second cover plate are also semi-circular or semi-elliptical, and the protruding tenons on the second cover plate are also semi-circular or semi-elliptical. The semi-circular tenons on the second cover plate are mortised and tenoned with the semi-circular grooves on the first cover plate. The grooves on the first and second cover plates also interlock to form small holes for inserting cuttings, sowing seeds, or planting seedlings.

[0032] Furthermore, the diameter of the holes in the groove and the protruding tenon is 2-5 cm.

[0033] Furthermore, the first and second cover plates are square or rectangular; the side lengths of the first and second cover plates are 0.5-1.5m; and the thicknesses of the first and second cover plates are 2-5cm.

[0034] Furthermore, the sedimentation ditch is covered with a top plate, which has a sand inlet facing upwind.

[0035] Furthermore, the top plate is inclined.

[0036] Another aspect of the present invention discloses a wind and sand protection method, which includes setting up a plant fiber foamed cement-based wind and sand protection system upwind of the protected object, wherein the third protection structure, the second protection structure and the first protection structure are arranged sequentially in a direction away from the protected object.

[0037] Furthermore, the sedimentation ditch is set up with the sand inlet facing upwind.

[0038] Compared with the prior art, the advantages of the present invention include:

[0039] (1) The plant fiber foamed cement-based wind and sand protection system provided in this embodiment of the invention has a first protective structure of at least one double vertical sand-blocking wall with a certain spacing. The movable sand-fixing ball on the sand accumulation surface in the middle can roll freely under the action of wind. It has the characteristics of covering the sand surface and not being buried itself. It can reduce the wind speed of the sand surface and suppress sand rising. Compared with traditional sand-blocking barriers and sand-blocking walls, this first protective structure realizes the complete fixation of the sand surface between the vertical sand-blocking walls. Once the flowing sand enters between the sand-blocking walls, it is impossible to continue to move downwind, thereby avoiding harm to the protected object.

[0040] (2) The plant fiber foamed cement-based wind and sand protection system provided in this embodiment of the invention uses a netting system to separate the ground surface from the airflow, effectively reducing wind speed on the sand surface and capturing and fixing shifting sand. The lifting ball has a low density and can float on the water surface. Under the action of wind and the pull of the connecting rope, it can roll freely within a certain range without being buried by shifting sand. At the same time, the lifting ball supports the netting system and keeps it on a plane at a certain height above the ground surface. Relying on the natural force of wind and sand action, the netting system, supported by the lifting ball, will automatically rise gradually along the uprights through the sliding rings set on the netting system, so that the netting system always maintains a fixed distance from the sand surface and maintains its planar shape, thus continuously and permanently fixing the sand surface under the netting system. This netting system can permanently fix large areas of shifting sand and is suitable for use in environments with particularly abundant sand sources and strong sand transport.

[0041] (3) The embodiment of the present invention provides a plant fiber foamed cement-based wind and sand protection system. The top plate of the sedimentation ditch is provided with multiple sand inlets, which can capture all sand particles in the passing wind and sand flow and pour them into the semi-enclosed sedimentation ditch to completely fix the flowing sand. The top plate can also be opened to use a high-power vacuum truck to mechanically clean the sedimentation ditch.

[0042] 4) The wind and sand protection system based on plant fiber foamed cement provided in this embodiment of the invention uses a grid-shaped sand-fixing and afforestation covering board made of cutting branches. On the one hand, it can fix shifting sand, and on the other hand, it can provide wind protection, shade, and moisture retention for plant seedlings in the small holes, promoting plant survival and growth. Once the plants have grown, they can be removed and transported to other sandy areas that need afforestation, achieving multiple recycling. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of a plant fiber foamed cement-based wind and sand protection system provided in a typical embodiment of the present invention;

[0044] Figure 2 This is a front view of the first protective structure provided in a typical embodiment of the present invention;

[0045] Figure 3 This is a left view of the first protective structure provided in a typical embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the netting component provided in a typical embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the lifting ball structure provided in a typical embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the sedimentation ditch provided in a typical embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the structure of the first cover plate and the second cover plate provided in a typical embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of the sand-fixing and afforestation cover plate provided in a typical embodiment of the present invention;

[0051] Explanation of reference numerals in the attached drawings: 1. First protective structure; 2. Second protective structure; 3. Third protective structure; 5. Protected object; 11. Vertical sand-blocking wall; 12. Movable sand-fixing ball; 13. Column; 14. Ground; 15. Sand accumulation surface; 16. Main wind direction; 21. Lifting ball; 212. Fixing ring; 213. Connecting rope; 22. Covering net; 23. Upright pole; 24. Sliding ring; 31. Side plate; 32. Bottom plate; 33. Top plate; 34. Hinge; 35. Handle; 4. Sand-fixing and afforestation covering plate: 41. First covering plate; 411. First groove; 42. Second covering plate; 421. Second groove; 422. Tenon. Detailed Implementation

[0052] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0053] This invention discloses a plant fiber foamed cement-based wind and sand protection system, comprising a first protective structure, a second protective structure, a third protective structure, and a fourth protective structure arranged sequentially and at intervals along a selected direction, wherein the selected direction is the direction of wind and sand flow (i.e., Figure 1 The middle arrow points to the prevailing wind direction (16).

[0054] The first protective structure is used to block the quicksand and fix the sand surface between two adjacent vertical sand-blocking walls 11. The quicksand is blocked on both sides of the vertical sand-blocking wall 11 to form a sand accumulation surface 15.

[0055] The second protective structure is used to separate the ground surface from the airflow, which can effectively reduce the wind speed on the sand surface and capture and fix the quicksand.

[0056] The first, second, third, and fourth protective structures in this invention need to be set up according to the selected direction. This is because the sand-blocking wall is a sand-blocking measure with the largest sand-blocking capacity and is generally set at the leading edge of the project. The netting and sedimentation ditch are both sand-fixing measures and are generally set after the sand-blocking measures, closer to the protected object. The netting measure can automatically rise as the sand surface elevation increases, so the protection period is long and the sand-fixing capacity is huge. When a small amount of wind and sand breaks through the above two protective measures and approaches the protected object, the sedimentation ditch captures and fixes these residual flowing sands, and avoids the secondary release of sand and dust, ultimately achieving the purpose of completely blocking wind and sand.

[0057] The first protective structure intercepts and fixes a large amount of shifting sand, and also serves to fix the shifting sand; the second protective structure's mesh surface can be raised by natural wind force, thus having a long lifespan and the ability to fix large areas of deep shifting sand layers; the third protective structure can completely intercept and fix any remaining shifting sand. Therefore, as a whole, this system can completely fix the sand particles in the wind-blown sand flow, and will not produce any remaining shifting sand or secondary sandstorms.

[0058] Based on the above, the spacing between the first protective structure 1, the second protective structure 2, the third protective structure 3 and the fourth protective structure is 530m. In this embodiment, the spacing between the first protective structure 1 and the second protective structure 2 is set to 15m, and the spacing between the second protective structure and the third protective structure and the third protective structure and the fourth protective structure is set to 10m.

[0059] In some embodiments, the first protective structure includes at least one double-vertical sand-blocking structure, and one, two or more double-vertical sand-blocking structures may be provided; the double-vertical sand-blocking structure includes two vertical sand-blocking walls arranged sequentially and spaced apart on the ground along a selected direction, the distance between the two vertical sand-blocking walls being 2-5m, and a movable sand-fixing ball being provided between them; the movable sand-fixing ball automatically rolls between two adjacent vertical sand-blocking walls; the vertical sand-blocking wall 11 has a wall height of 1.5-3m and a thickness of 10-40cm, and the vertical sand-blocking wall is provided with multiple through holes, the diameter of the through holes being 5-20cm, and the wall permeability being 20-40%.

[0060] Because the movable sand-stabilizing balls need to avoid being buried by quicksand and be able to roll freely on the sand surface, they need to be lightweight. In this embodiment, the movable sand-stabilizing balls are made of plant fiber foamed cement. Due to their light weight, the movable sand-stabilizing balls can roll freely between the two vertical sand-blocking walls 11 under wind force, preventing them from being buried by the sand surface and reducing wind speed. Simultaneously, through the rolling, blocking, and covering effect of the movable sand-stabilizing balls 12, it is difficult for quicksand to move between the two vertical sand-blocking walls 11, achieving complete fixation of the sand surface between the vertical sand-blocking walls 11 and suppressing sand movement. Once quicksand enters between the vertical sand-blocking walls 11, it cannot continue to move downwind, thus avoiding damage to the protected object 5. The diameter of the movable sand-stabilizing balls is 20-50cm, and the diameter of the movable sand-stabilizing balls 12 can be set according to actual needs, specifically 20cm, 30cm, 40cm, or 50cm.

[0061] The object to be protected can be any object that needs protection from wind and sand, such as photovoltaic panels or train tracks.

[0062] To secure the vertical sand-blocking wall 11, detachable fasteners can be installed on its sides. The vertical sand-blocking wall 11 can be fixed using columns. Specifically, the columns have slots at both ends to hold the vertical sand-blocking wall 11 in place. The columns 13 have a height of 2-4m, a thickness of 20-40cm, and a burial depth of 0.5-1m, which is the depth to which they are embedded in the sand surface. Alternatively, the vertical sand-blocking wall 11 can be fixed using a fixing plate, secured with screws and nuts.

[0063] In some embodiments, the second protective structure includes at least one netting assembly 2, which covers the ground surface and serves at least to isolate the ground surface from the airflow. The netting assembly 2 includes several lifting balls 21, a netting 22 covering the upper surface of the lifting balls 21, and a connecting rope 213 connecting the netting 22 and the lifting balls 21. Under the action of wind and the traction of the connecting rope 213, the lifting balls 21 can roll freely within a certain area, which refers to a circle centered on the fixed point where the netting and the connecting rope are fixed, with the length of the connecting rope as the radius. By supporting the netting 22 with the lifting balls 21, the netting 22 maintains a fixed distance from the sand surface, effectively reducing wind speed on the sand surface and capturing fixed shifting sand.

[0064] In this embodiment, the lifting ball 21 is made of plant fiber foamed cement. Due to its low density, it floats on water and can roll freely within a certain area under the action of wind and the pull of the connecting rope 213, preventing it from being buried by quicksand. Simultaneously, the lifting ball 21 supports the netting 22, keeping it at a certain height above the ground. Relying on the natural force of wind and sand movement, the netting 22, supported by the lifting ball 21, automatically rises gradually along the uprights 23 via sliding rings 24 at its four corners. This ensures that the netting 22 maintains a fixed distance from the sand surface and preserves its planar shape, thus continuously and permanently fixing the sand surface beneath it. This netting 22 can persistently fix large areas of deep quicksand layers and is suitable for use in environments with abundant sand sources and strong sand transport. The diameter of the lifting ball 21 is 20-50cm, and the diameter of the lifting ball 21 can be 20cm, 30cm, 40cm or 50cm. The distance between adjacent lifting balls 21 is 30-150cm.

[0065] Based on the above, a fixing ring 212 is provided on the lifting ball 21, and the two ends of the connecting rope 213 are fixedly connected to the fixing ring 212 and the covering net 22 respectively.

[0066] The netting 22 is installed perpendicular to the prevailing wind direction 16, with a width of 5-50m and a length determined by the object being protected 5; the netting 22 is made of HDPE nylon mesh, and the porosity of the netting 22 is 20-40%.

[0067] Based on the above, the netting assembly 2 further includes a sliding ring 24 and a vertical pole 23 disposed on the netting 22. The sliding ring 24 is fixedly connected to the netting 22 and is sleeved on the vertical pole 23, which is fixed to the ground. The vertical pole 23 is preferably a galvanized steel pipe, with a height of 1.5-3.5m, a diameter of 2-5cm, and a height of 0.53m protruding from the sand surface.

[0068] In some embodiments, the second protective structure includes a plurality of netting components, which are spaced apart from blank strips in the selected direction. The width of the netting components is 5-50m, and the spacing between two adjacent netting components is 5-25m. The blank strips referred to here are the blank ground between two netting components.

[0069] In some embodiments, the third protective structure includes at least one sedimentation ditch 3, which is used to capture sand particles in the wind-blown sand flow.

[0070] In some embodiments, the sedimentation ditch 3 has a trapezoidal cross-section and includes a sedimentation ditch body surrounded by side plates 31, a bottom plate 32, and a top plate 33. The side plates 31, bottom plate 32, and top plate 33 are all integrally molded from plant fiber foamed cement material. The thickness of the side plates 31, top plate 33, and bottom plate 32 is 5-10 cm; the width of the top plate 33 is 2-4 m, and the width of the bottom plate 32 is 1-3 m; the depth of the sedimentation ditch body is 1-3 m. A sand inlet is provided on the top plate, inclined towards the upwind direction, allowing flowing sand to enter the sedimentation ditch 3 and deposit within it.

[0071] Specifically, one side of the top plate 33 is connected to the side plate 31 via a hinge 34, and a handle 35 is provided on the other side of the top plate 33 for easy opening of the top plate 33 during subsequent sand cleaning and maintenance work, and then using a high-powered vacuum truck to mechanically clean the sand ditch body.

[0072] During installation, a trapezoidal trench needs to be dug first, and then a bottom plate 32, a side plate 31 and a top plate 33 are laid in the trapezoidal trench to form the main body of the sedimentation trench.

[0073] In some embodiments, the fourth protective structure includes a sand-fixing and afforestation cover plate 4. The sand-fixing and afforestation cover plate 4 includes at least one first cover plate 41 and at least one second cover plate 42. Each edge of the first cover plate 41 is provided with a plurality of first grooves 411; each edge of the second cover plate 42 is provided with a plurality of second grooves 421 and at least one protruding tenon 422. The protruding tenon 422 on the second cover plate 42 corresponds in position to and has the same or similar shape to the first grooves 411 on the first cover plate 41. The second cover plate 42 and the first cover plate 41 are spliced ​​together by the protruding tenon 422 on the second cover plate 42 and the first grooves 411 on the first cover plate 41. The first grooves 411 on the first cover plate 41 are also spliced ​​with the second grooves 421 on the second cover plate 42 to form small holes for inserting cuttings, sowing seeds, or planting seedlings. The cover plates are spliced ​​together. After the plants grow and their roots penetrate deep into the sand layer, they can be removed and transported to other sandy areas that need afforestation, achieving multiple recycling. Lightweight foamed cement boards incorporating grass fibers are laid in a splicing manner, making transportation and construction convenient. Branches are inserted into the holes to form an upright, square-shaped sand-stabilizing structure, which can fix shifting sand and also provide wind protection and shade for plant seedlings, promoting their survival and growth.

[0074] Specifically, the first groove 411 on the first cover plate 41 is semi-circular or semi-elliptical; the second groove 421 on the second cover plate 42 is semi-circular or semi-elliptical; the protruding tenon 422 on the second cover plate 42 is semi-circular or semi-elliptical; the diameter of the first groove 411 and the protruding tenon 422 is 2-5cm; the first cover plate 41 and the second cover plate 42 are square or rectangular; the side length of the first cover plate 41 and the second cover plate 42 is 0.5-1.5m; and the thickness of the first cover plate 41 and the second cover plate 42 is 2-5cm.

[0075] Using a mold, foamed cement mixed with grass fiber material is cast into a first cover plate 41 and a second cover plate 42 with a semi-circular or semi-elliptical first groove 411 on the edge and a protruding tenon 422. Both the first cover plate 41 and the second cover plate 42 are square or rectangular with a side length of 0.5-1.5m. The notches on the edge of the plates are semi-circular or semi-elliptical with a diameter of 25cm, and the plate thickness is 2-5cm. Each edge of the first cover plate 41 has a semi-circular or semi-elliptical first groove 411, and each edge of the second cover plate 42 not only has a semi-circular or semi-elliptical second groove 421, but also has a semi-circular or semi-elliptical protruding tenon 422 in the middle of each edge. The first cover plate 41 and the second cover plate 42 can be mortised and tenoned to form sand-fixing and afforestation cover plates 4 of different shapes and sizes to meet the sand-fixing and afforestation needs of different plots and terrains.

[0076] The sand-fixing afforestation cover plate 4 is suitable for surface or strip afforestation and wind and sand protection in sandy areas, such as railways, highways, photovoltaic array areas and their surroundings.

[0077] First, the sand surface is leveled, and the covering board is laid on top of it. Then, shrub seeds are scattered into the holes on the surface of the covering board, or shrub seedlings are artificially planted in the holes using a seedling planter. Leafy poplar branches, cotton stalks, or other readily available local plant stems are inserted into the holes to form an upright, grid-like sand-fixing structure. This structure not only stabilizes the shifting sand but also provides wind protection and shade for the seedlings, promoting their survival and growth. Finally, artificial watering or rainfall is applied to the holes and around them. The water flows into the holes, increasing the local sand humidity and maintaining long-term moisture, promoting seedling survival and seed germination. Once the plants have grown, they can be removed and transported to other sandy areas requiring afforestation, achieving multiple cycles of reuse.

[0078] Another implementation of the sand-fixing and afforestation cover board 4:

[0079] The sand-fixing and afforestation cover plate 4 includes a perforated film, which is laid on the sand surface. Dryland shrub seeds or shrub seedlings are sown in the holes and planted with plant stems. Plastic strips are provided around the holes to reinforce the openings, enhance the tensile strength of the hole edges, and reduce the breakage rate during laying.

[0080] The perforated greenhouse film is a long strip, 2-10m wide and 50-200m long. It has square holes arranged in a grid pattern, with each square having a side length of 0.5-1.5m, a spacing of 5-30cm, and a diameter of 2-4cm. Thick plastic edging is used along the edges of the long strip film and the edges of the holes to increase edge strength and tear resistance.

[0081] Specific implementation method: First, lay a perforated greenhouse film on the sand surface, pressing the four edges of the film firmly into the sand layer to fix the edges of the film; then, scatter the seeds in the holes on the surface of the greenhouse film or plant seedlings in the holes, and insert leafy branches of readily available local plants such as poplar branches or cotton stalks into the holes to form an upright square sand-fixing structure, which on the one hand fixes the shifting sand, and on the other hand provides wind protection and shade for the seedlings, promoting the survival and growth of the plants; finally, water is poured into and around the holes, and the water will flow into the holes, increasing the local humidity of the sand layer, promoting the survival of seedlings and seed germination.

[0082] Example 1:

[0083] A plant fiber foamed cement-based wind and sand protection system, such as Figure 1 As shown, the structure includes a first protective structure 1, a second protective structure 2, a third protective structure 3, and a fourth protective structure 4, arranged sequentially at intervals in a selected direction. All four protective structures are positioned upwind of the protected object 5 and arranged sequentially downwind.

[0084] likeFigure 2 , Figure 3 As shown, the first protective structure 1 includes two vertical sand-blocking walls 11 spaced apart. Each vertical sand-blocking wall 11 has a height of 3m and a thickness of 30cm, and multiple through holes with a diameter of 10cm. Columns 13 are provided at both ends of each vertical sand-blocking wall 11. The columns 13 have slots on their opposite surfaces, and the ends of the vertical sand-blocking walls 11 are secured within these slots. Each column 13 has a height of 4m, a thickness of 40cm, and a burial depth of 1m. Several movable sand-fixing balls 12 are arranged between the two vertical sand-blocking walls 11. Each movable sand-fixing ball 12 is solid and has a diameter of 30cm. The vertical sand-blocking walls 11, movable sand-fixing balls 12, and columns 13 are all made of plant fiber foamed cement.

[0085] The manufacturing method of plant fiber foamed cement includes:

[0086] S1. Preparation of plant fibers;

[0087] S2. Preparation of foamed cement;

[0088] S3. Mix the plant fiber and foamed cement evenly, and inject them into the film pressing machine for film pressing;

[0089] Among them, the plant fiber in S1 is tanned from natural plant materials, specifically, the plant fiber is tanned from natural plant materials such as wheat straw, rice straw, and wood fiber;

[0090] The foamed cement in S2 is made by mixing foaming agent and cement in a certain proportion.

[0091] In S3, plant fibers and foamed cement are mixed evenly in a certain proportion and injected into a molding machine to produce components of the above-mentioned plant fiber foamed cement materials.

[0092] This material has low density, is lightweight, and can float on water. Due to the addition of plant fibers, its strength is also greatly improved. It has the advantages of being economical, environmentally friendly, low-cost, and easy to construct.

[0093] like Figure 4 , Figure 5As shown, the second protective structure 1 is the netting assembly 2, which includes several lifting balls 21, a netting 22 covering the upper surface of the lifting balls 21, and connecting ropes 213 connecting the netting 22 and the lifting balls 21. The netting 22 is set perpendicular to the prevailing wind direction 16, and its width is 30m. The netting 22 is made of HDPE nylon mesh, and its porosity is 40%. The lifting balls 21 are solid and made of plant fiber foamed cement. The diameter of the lifting balls 21 is 30cm, and the distance between adjacent lifting balls 21 is 100cm. A fixing ring 212 is provided on the lifting ball 21. The two ends of the connecting rope 213 are fixedly connected to the fixing ring 212 and the netting 22, respectively. A sliding ring 24 and a vertical pole 23 are provided at the corners of the netting 22. The sliding ring 24 is fixedly connected to the corners of the netting 22. One end of the vertical pole 23 is buried in the ground 14, and the other end extends upward. The sliding ring 24 is sleeved on the vertical pole 23. The vertical pole 23 is a galvanized steel pipe. The vertical pole 23 is 3.5m high, 5cm in diameter, 0.5m buried, and 3m above ground.

[0094] like Figure 6 As shown, the third protective structure includes a sedimentation ditch 3, which comprises a sedimentation ditch body surrounded by side plates 31, a bottom plate 32, and a top plate 33. The cross-section of the sedimentation ditch body is trapezoidal. The side plates 31, bottom plate 32, and top plate 33 are all integrally molded from plant fiber foamed cement material. Multiple sand inlets are provided on the top plate 33, and each top plate is inclined. One side of the top plate 33 is connected to the side plate 31 via a hinge 34, and a handle 35 is provided on the other side of the top plate 33. The thickness of the side plates 31, top plate 33, and bottom plate 32 is 10 cm; the width of the top plate 33 is 4 m, and the width of the bottom plate 32 is 3 m; the depth of the sedimentation ditch body is 3 m; the thickness of the baffle is 5 cm; and the thickness of the sand inlets is 20 cm.

[0095] like Figure 7 , Figure 8 As shown, the fourth protective structure is the sand-fixing and afforestation cover plate 4, which includes at least one first cover plate and at least one second cover plate. Each edge of the first cover plate is provided with multiple grooves; each edge of the second cover plate is provided with multiple grooves and at least one protruding tenon. The protruding tenon on the second cover plate corresponds to the groove on the first cover plate and has the same or similar shape. The second cover plate and the first cover plate are spliced ​​together by the protruding tenon on the second cover plate and the groove on the first cover plate. The groove on the first cover plate is also spliced ​​with the groove on the second cover plate to form a small hole for inserting cuttings, sowing seeds or planting seedlings.

[0096] Example 2:

[0097] A method for wind and sand protection includes setting up a double vertical sand-blocking wall, a netting assembly, and a sand-sedimentation ditch at intervals along the windward direction of the sand flow on the upwind side of the protected object.

[0098] Specifically, the distance between the vertical sand-blocking wall near the netting component and the netting component is set to 15m, and the distance between the netting component and the sedimentation ditch is set to 10m.

[0099] The movable sand-fixing ball is placed between two vertical sand-blocking walls, and the movable sand-fixing ball rolls freely between the two vertical sand-blocking walls;

[0100] The lifting ball is fixed to the netting with a connecting rope. The upright is inserted into the ground with 3m protruding from the ground. The sliding ring on the netting is placed on the upright. The lifting ball supports the netting, and there is a distance between the netting and the ground.

[0101] A trapezoidal sand-sedimentation ditch is dug upwind of the protected object and downwind of the netting assembly. A top plate is installed above the sand-sedimentation ditch, and a sand inlet is dug on the top plate. The sand inlet is tilted upwind at an angle of 45°.

[0102] Example 3:

[0103] The difference between this embodiment and embodiment two is that two netting components are set up upwind of the sand control ditch, with the netting components and the blank strip spaced apart. The width of the netting components is set to 30m, and the distance between the two netting components is set to 20m.

[0104] Example 4:

[0105] The difference between this embodiment and Embodiment 2 is that: two double vertical sand-blocking walls are set up on the upwind side of the netting assembly, and the movable sand-fixing balls are placed between the two adjacent vertical sand-blocking walls.

[0106] Comparative Example 1:

[0107] The difference between this comparative example and Implementation 2 is that this wind and sand protection method includes setting up a netting component, two vertical sand-blocking walls, a sand-sedimentation ditch, and a sand-fixing and afforestation covering board at intervals on the upwind side of the protected object in accordance with the direction of wind and sand flow.

[0108] Comparative Example 2:

[0109] The difference between this comparative example and Example 2 is that the wind and sand protection method includes setting up a sand settling ditch, a netting assembly, two vertical sand-blocking walls, and a sand-fixing and afforestation covering board at intervals on the upwind side of the protected object in accordance with the direction of wind and sand flow.

[0110] Comparative Example 3:

[0111] The difference between this comparative example and Example 2 is that: a wind and sand protection method includes setting two vertical sand-blocking walls and a sand-sedimentation ditch at intervals on the upwind side of the protected object in accordance with the direction of wind and sand flow.

[0112] Comparative Example 4:

[0113] The difference between this comparative example and Example 2 is that: a wind and sand protection method includes setting two vertical sand-blocking walls and a netting component at intervals on the upwind side of the protected object in the direction of wind and sand flow.

[0114] Comparative Example 5:

[0115] The difference between this comparative example and Example 2 is that: a wind and sand protection method includes setting up a vertical sand-blocking wall, a netting assembly and a sand-sedimentation ditch at intervals in the windward direction of the protected object according to the direction of wind and sand flow. In addition, no movable sand-fixing balls are set up in this comparative example.

[0116] Comparative Example 6:

[0117] The difference between this comparative example and Example 2 is that the lifting ball is not connected to the netting, and the netting is fixed to the ground.

[0118] The conclusion of this invention compared with Comparative Examples 1-6 is as follows:

[0119] In this invention, the double-vertical sand-blocking wall, the netting assembly, and the sedimentation ditch are sequentially arranged along the windward direction. Their sand-blocking and stabilization capacities differ. The double-vertical sand-blocking wall has a larger sand-blocking capacity than a typical sand-blocking wall, but a large amount of flowing sand still passes through it. The netting assembly can be lifted as the thickness of the wind-blown sand increases, thus stabilizing a large amount of sand and fixing most of the flowing sand. Finally, the remaining flowing sand is captured and fixed by the sedimentation ditch. Therefore, the sequential arrangement of these components results in varying sand-blocking and stabilization efficiencies. The resulting system can effectively block and fix most of the wind-blown sand flow under conditions of strong sand transport, completely solving the problem of wind-blown sand burying the protected object.

[0120] The first, second, third, and fourth protective structures in this invention need to be set up according to the selected direction. This is because the sand-blocking wall is a sand-blocking measure with the largest sand-blocking capacity. Following the principle of blocking first and then consolidating, it is generally set at the leading edge of the project. The netting and sedimentation ditch are both sand-consolidation measures and are generally set after the sand-blocking measures, closer to the protected object. The netting measure can automatically rise as the sand surface elevation increases, thus having a long protection period and a huge sand-consolidation capacity. When a small amount of wind and sand breaks through the above two protective measures and approaches the protected object, the sedimentation ditch captures and fixes these residual flowing sands, avoiding the secondary release of sand and dust, and ultimately achieving the purpose of completely blocking wind and sand.

[0121] In Comparative Examples 1 and 2, changing the order of the first, second, third, and fourth protective structures reduces their protective effect. Firstly, if the sand-fixing measures are at the leading edge, their height is limited and they cannot effectively block the wind, allowing the sand flow to penetrate deeply. In particular, the sedimentation ditch may quickly become filled with quicksand and become ineffective. Therefore, sedimentation ditches are generally used as the last line of defense. Conversely, placing the sand-blocking wall in front effectively reduces wind speed and decreases the sand-carrying capacity of the sand flow, allowing the subsequent sand-fixing measures to play a more effective role.

[0122] In Comparative Examples 3 and 4, any two protective structures combined to form a system will cause some of the quicksand that breaks through the protective system to harm the protected object, and will not be able to completely block and fix the quicksand.

[0123] In Comparative Example 5, removing the movable sand-fixing balls does not reduce the wind speed on the sand surface. Without the rolling, blocking, and covering effect of the movable sand-fixing balls, the quicksand between the two vertical sand-blocking walls will be stirred up again by the wind, threatening the protected object. Therefore, the effect of fixing the sand surface and suppressing sand movement cannot be achieved.

[0124] In Comparative Example 6, if the lifting ball is removed, the netting will lose its lifting function. The netting, which is close to the ground surface, can only prevent sand from being stirred up on the spot, but cannot intercept and fix the sand flow. The shifting sand will then drive straight into the protected object and cause damage.

[0125] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A plant fiber foamed cement-based wind and sand protection system, characterized in that, include: A first protective structure, a second protective structure, a third protective structure, and a fourth protective structure are arranged sequentially at intervals along a selected direction; The first protective structure includes at least one double vertical sand-blocking structure, wherein the double vertical sand-blocking structure includes two vertical sand-blocking walls that are sequentially spaced on the ground along a selected direction, and a movable sand-fixing ball is provided between the two vertical sand-blocking walls; the movable sand-fixing ball automatically rolls between two adjacent vertical sand-blocking walls. The second protective structure includes at least one netting assembly, which includes a plurality of lifting balls and a netting covering the upper surface of the lifting balls. The lifting balls roll freely on the sand surface, and the netting always maintains a fixed distance from the sand surface. The third protective structure includes at least one sedimentation ditch, which is located underground and is used to capture sand particles in the wind-blown sand flow. The fourth protective structure includes at least one sand-fixing and afforestation cover plate, and the sand-fixing and afforestation cover plate is provided with at least one through hole; The vertical sand-blocking wall, movable sand-fixing ball, lifting ball, sand-settling ditch, and sand-fixing afforestation cover board are all made of plant fiber foamed cement-based material.

2. The plant fiber foamed cement-based wind and sand protection system according to claim 1, characterized in that: The spacing between the first protective structure, the second protective structure, and the third protective structure is 5-30m.

3. The plant fiber foamed cement-based wind and sand protection system according to claim 1, characterized in that, The distance between two adjacent vertical sand-blocking walls is 2-5m; And / or, the vertical sand-blocking wall is provided with multiple through holes, the diameter of which is 5-20cm, and the wall permeability is 20-40%; And / or, a column for fixing the vertical sand-blocking wall is provided on one side of the vertical sand-blocking wall; And / or, the height of the column ranges from 2 to 4 m, the thickness is 20 to 40 cm, and the burial depth is 0.5 to 1 m; And / or, the movable sand-fixing ball is solid and has a diameter of 20-50cm.

4. The plant fiber foamed cement-based wind and sand protection system according to claim 1, characterized in that, The netting assembly also includes a connecting rope that connects the netting to the lifting ball.

5. The plant fiber foamed cement-based wind and sand protection system according to claim 4, characterized in that, The lifting ball is equipped with a fixing ring, and the two ends of the connecting rope are fixedly connected to the fixing ring and the netting, respectively.

6. The plant fiber foamed cement-based wind and sand protection system according to claim 4, characterized in that, The netting assembly also includes a sliding ring and a vertical pole. The sliding ring is fixedly connected to the netting and is sleeved on the vertical pole, which is fixed to the ground.

7. The plant fiber foamed cement-based wind and sand protection system according to claim 6, characterized in that, The diameter of the lifting ball is 20-50cm; And / or, the spacing between adjacent lifting balls is 30-150cm; And / or, the porosity of the covering mesh is 20-40%; And / or, the height of the upright protruding from the sand surface is 0.5-3m.

8. The plant fiber foamed cement-based wind and sand protection system according to claim 1, characterized in that: The second protective structure includes multiple netting components. In the selected direction, the netting components are spaced apart from the blank strip. The width of the netting components is 5-50m, and the spacing between two adjacent netting components is 5-25m.

9. The plant fiber foamed cement-based wind and sand protection system according to claim 1, characterized in that: The cross-section of the sedimentation ditch is trapezoidal; And / or, the sedimentation ditch is covered with a top plate, and a sand inlet is provided on the top plate, which is inclined towards the upwind direction; And / or, the upper width of the sedimentation ditch is 2-4m, the lower width is 1-3m, and the depth is 1-3m; The sand-fixing and afforestation cover board includes at least a first cover board and at least a second cover board. Each edge of the first cover board is provided with multiple grooves. Each edge of the second cover board is provided with multiple grooves and at least one protruding tenon. The protruding tenon on the second cover board corresponds to the groove on the first cover board and has the same or similar shape. The second cover board and the first cover board are spliced ​​together by the protruding tenon on the second cover board and the groove on the first cover board. The groove on the first cover board is also spliced ​​with the groove on the second cover board to form a small hole for inserting cuttings, sowing seeds, or planting seedlings. And / or, the groove on the first cover plate is a semi-circular groove; the groove on the second cover plate is a semi-circular groove, and the protruding tenon on the second cover plate is a semi-circular protruding tenon; And / or, the diameter of the groove and the protruding tenon is 2-5 cm; And / or, the first and second cover plates are square; the side length of the first and second cover plates is 0.5-1.5m; the thickness of the first and second cover plates is 2-5cm.

10. A method for wind and sand protection, characterized in that: include: A plant fiber foamed cement-based wind and sand protection system as described in any one of claims 1-9 is installed upwind of the protected object; the third protective structure, the second protective structure, and the first protective structure are arranged sequentially in a direction away from the protected object. And / or, set up the sedimentation ditch with the sand inlet facing upwind.

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