A prestressed fiber mesh cloth sand barrier plate mold and a prestressing method thereof

Abstract

This invention provides a prestressed fiber mesh sand-blocking board mold and a method for applying prestress. The sand-blocking board mold includes a sand-blocking board mold frame; a base plate located at the lower opening of the sand-blocking board mold frame, used to form a cavity for preparing the sand-blocking board after the sand-blocking board mold frame and the base plate are spliced ​​together; multiple insertion holes are evenly spaced around the perimeter of the base plate; and multiple fixing piles, which can be inserted longitudinally into the cavity of the sand-blocking board through the insertion holes, used to hang the fiber mesh fabric layer in the sand-blocking board on the fixing piles for flattening and applying prestress. In the sand-blocking board casting process, a fiber mesh fabric of a certain size is hung on the fixing piles, tensioned, flattened, spread, stretched, and a certain amount of prestress is applied. After the prestressed fiber mesh fabric is solidified with the desert sand cement-based concrete, the compressive force generated by the prestressed fiber mesh fabric greatly improves the flexural, bending, and tensile properties of the sand-blocking board.

Description

Technical Field

[0001] The invention belongs to the technical field of wind-proof and sand-fixing equipment, and in particular relates to a prestressed fiber mesh cloth sand-blocking plate mold and a prestressing method thereof. Background Art

[0002] Due to the low precipitation in winter and spring in Northwest my country, the dry surface forms sandstorms driven by the monsoon, which not only affects people's lives, but also affects the normal operation of roads and railways. In order to reduce the harm of sandstorms to roads and railways, early roads and railways mainly used straw, reeds and crop straw to form grass grid sand barriers to fix sand inside and outside. However, with the development of papermaking and modern agriculture, it has become very difficult to obtain raw materials. Subsequently, clay grids or stone grids made of clay and stone appeared as substitutes for straw grids, but they are not suitable for application and are rarely used. Adhesive materials such as emulsified asphalt, high molecular polymer and water glass are sprayed on the surface of quicksand to form a protective layer of a certain thickness. However, due to its high cost, it has not been vigorously promoted. Although honeycomb sand barriers made of nylon mesh sand barriers and HDPE new materials have a certain sand-blocking effect, they are easily damaged by strong winds, thus causing secondary environmental pollution to the environment. In order to overcome the above problems, the researchers proposed a construction method of preparing sand-blocking boards using local materials such as desert aeolian sand. On the one hand, this construction method solves the difficulties in obtaining materials and the shortage of building materials in desert areas. On the other hand, it realizes the concept of "using sand to control sand" and reduces costs.

[0003] However, the prior art directly uses desert sand to make sand-blocking boards. As the finished concrete sand-blocking boards mainly composed of aeolian sand and cement are not added with any reinforcing materials, the sand-blocking boards may not be able to play their sand-blocking function or have serious insufficient tensile, bending or flexural mechanical properties during construction, transportation and hoisting. To solve this problem, fiber filaments are usually mixed in the casting project of the sand-blocking boards. The flexural, tensile or flexural properties of the sand-blocking boards reinforced with fiber filaments can be improved to a certain extent, but the improvement is not large. However, the method of applying mesh cloth can greatly improve the flexural, tensile or flexural properties of the sand-blocking boards. However, as the fiber mesh cloth has a certain elasticity, in order to maximize its effect in the sand-blocking board, it is necessary to ensure that the fiber mesh cloth is in a taut state inside the sand-blocking board, and the elasticity of the fiber mesh cloth is used to make the sand-blocking board as a whole contracted state, so that the sand-blocking board is denser. When the sand barrier is prepared using the mold in the prior art, the fiber mesh cloth in the sand barrier can only be laid by manual pulling. At this time, the fiber mesh cloth is subjected to uneven force, and a part of the limiting mesh cloth is loose. When the sand barrier is prepared, the elasticity of the fiber mesh cloth is not utilized, and the bending and folding resistance of the prepared sand barrier can not be improved well. However, in order to ensure the bending and folding resistance of the sand barrier to a certain extent, the thickness of the sand barrier cannot be reduced too much. However, during the construction of a thicker sand barrier, not only a large amount of labor is consumed, which is inconvenient for construction, but also the fiber mesh cloth and fine sand raw materials are wasted. Therefore, it is of great significance to design a prestressed fiber mesh cloth sand barrier plate mold which can further reduce the thickness of the sand barrier plate, improve the utilization rate of raw materials and facilitate construction, while ensuring that the sand barrier plate has good bending and folding resistance. Summary of the invention

[0004] The purpose of the present invention is to provide a prestressed fiber mesh cloth sand barrier plate mold and a prestressing method thereof, which are of great significance for the above-mentioned problems existing in the prior art and can further reduce the thickness of the sand barrier plate, improve the utilization rate of raw materials and facilitate construction, while ensuring that the sand barrier plate has good bending and folding resistance.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is a prestressed fiber mesh cloth sand barrier plate mold, comprising

[0006] Sand blocking plate mold frame;

[0007] A bottom plate is provided at the lower opening of the sand blocking plate mold frame, and is used to form a cavity for preparing the sand blocking plate after the sand blocking plate mold frame and the bottom plate are spliced ​​together. A plurality of plug holes are provided on the bottom plate at equal intervals around the peripheral wall of the bottom plate;

[0008] There are multiple fixing piles, which can be respectively inserted into the cavity of the prepared sand blocking plate along the longitudinal direction through each insertion hole, and adjacent fixing piles are arranged at equal intervals, and are used to hang the fiber mesh cloth in the sand blocking plate on each fixing pile to flatten it and apply prestress.

[0009] Preferably, the sand blocking plate mold frame comprises

[0010] First U-shaped frame;

[0011] The second U-shaped frame has an opening opposite to the opening of the first U-shaped frame, and the second U-shaped frame is arranged outside the first U-shaped frame and connected by multiple bolts. The bottom plate is arranged on the lower opening of the frame body surrounded by the first U-shaped frame and the second U-shaped frame.

[0012] Preferably, the interval between two adjacent insertion holes is at least 5-10 cm, and the fixing piles are inserted into different insertion holes, so that different prestresses can be applied to the fiber mesh cloth in the sand blocking plate.

[0013] Preferably, each insertion hole into which the fixing pile is not inserted is covered with a shielding layer for preventing slurry leakage, and the shielding layer is one of paper or plastic film.

[0014] Preferably, the fixing piles, the sand blocking plate mold frame and the bottom plate are all made of metal material or hard plastic with a smooth surface.

[0015] Preferably, the fixed piles, the sand blocking plate mold frame and the bottom plate are also coated with grease for easy demoulding, and the grease is one or more of waste engine oil, diesel, engine oil or vegetable oil.

[0016] Preferably, the fixing pile comprises

[0017] The pile body is inserted into the cavity through the insertion hole along the longitudinal direction and is used to hang the fiber mesh cloth;

[0018] The fixing piece is arranged at the lower end of the pile body, and the fixing piece is connected with the jack by snapping or threading.

[0019] A method for applying prestress to a prestressed fiber mesh cloth sand barrier plate mold comprises the following steps:

[0020] S1: Splice the sand-blocking plate mold frame and the bottom plate, then insert each fixing pile into each set socket according to the different prestressing force set, apply grease on the inner wall of the mold, and cover the unused sockets on the bottom plate with paper or plastic film;

[0021] S2: Lay the desert aeolian sand cement-based material mixture flat on the bottom plate of the mold cavity, then hang the fiber mesh cloth cut to a certain size with the same interval on the fixed pile, and stretch it flat on the bottom layer of the sand-proof board, and then lay the desert aeolian sand cement-based material mixture flat again, so that a layer of fiber mesh cloth is stretched and laid between the two layers of desert aeolian sand cement-based material mixture, and repeatedly lay the desert aeolian sand cement-based material mixture and fiber mesh cloth from bottom to top to prepare a prestressed sand-proof board, wherein each cubic meter of desert aeolian sand cement-based material mixture is made of a mixture of desert aeolian sand with a mass fraction of 60-65%, water with a mass fraction of 18-20%, and cement with a mass fraction of 20-23%, and the maximum prestress set is 9-35N / mm, that is, each millimeter of fiber mesh cloth can apply a maximum prestress of 0.92-3.57kg;

[0022] S3: After the mold is installed, the top layer is covered with a curing film;

[0023] S4: Remove the mold.

[0024] Preferably, the fiber mesh cloth is hung on a fixed pile and tensioned, so that the fiber mesh cloth generates 0.5-1.0 kg of prestress in the transverse direction and 1.0-2.0 kg of prestress in the longitudinal direction.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the process of casting and forming the sand barrier board, the fiber mesh cloth of a certain size is hung on the fixed pile, tensioned, flattened, spread and stretched, and a certain prestress is applied. The fiber mesh cloth to be prestressed is solidified into one with the desert sand cement-based concrete. The compression force of the prestressed fiber mesh cloth greatly improves the bending resistance and tensile resistance of the sand barrier board, enhances the integrity and durability of the sand barrier board, and reduces the use of fine sand layer and fiber mesh cloth, saving costs and process costs;

[0027] 2. The sand-blocking board prepared by the present invention can reduce the overall thickness of the sand-blocking board on the basis of ensuring the flexural strength and bending strength, which is convenient for construction and further enhances the practicality.

[0028] 3. The use of prestressed mesh cloth to enhance the flexural and tensile properties of the sand barrier makes the sand barrier not limited to a specific length, further expanding the scope of use of the sand barrier.

[0029] 4. The sand-blocking board mold of the present invention is composed of a first U-shaped frame, a second U-shaped frame and a bottom plate, which can be used to conveniently and quickly prepare the sand-blocking board, and is also easy to carry and transport, and is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the structural schematic diagram of the sand blocking plate;

[0031] Figure 2 Characteristic I of a prestressed fiber mesh sand barrier plate mold and its prestressing method, schematic diagram of the mold side;

[0032] Figure 3 Characteristic of a prestressed fiber mesh sand barrier plate mold and its prestressing method Ⅰ Schematic diagram of mold and prestressed fiber mesh distribution;

[0033] Figure 4 Characteristic I of a prestressed fiber mesh sand-blocking board mold and its prestressing method, front view of the mold;

[0034] Figure 5 It is a top view of a prestressed fiber mesh sand barrier plate mold and its prestressing method.

[0035] Figure 6 Characteristic II of a prestressed fiber mesh sand barrier plate mold and its prestressing method, front view of the mold;

[0036] Figure 7 Characteristic II of a prestressed fiber mesh sand barrier plate mold and its prestressing method, side view of the mold;

[0037] Figure 8 The present invention is a schematic diagram of the construction cross section of a prestressed fiber mesh cloth sand barrier plate mold and a method for applying prestress thereto.

[0038] Description of reference numerals:

[0039] 1. Bottom plate, 2. First U-shaped frame, 3. Second U-shaped frame, 4. Bolts, 5. Sockets, 6. Pile body, 7. Fixing parts, 8. Sand blocking plate mold frame, 9. Fixed piles, 10. Desert aeolian sand cement-based material casting layer, 11. Fiber mesh cloth layer. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] In the description of the present invention, it should be understood that the terms indicating orientation used in the description of the subject in the present invention, such as "height", "length", "width" and "front surface", are based on the description of the subject being placed vertically, that is, perpendicular to the ground, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Example

[0043] like Figure 1-8 As shown, the specific implementation of the present invention is implemented by adopting the following technical scheme: a prestressed fiber mesh cloth sand-blocking board mold, comprising

[0044] Sand blocking plate mold frame 8;

[0045] The bottom plate 1 is welded or screwed to the lower opening of the sand blocking plate mold frame 8, so as to form a cavity for preparing the sand blocking plate after the sand blocking plate mold frame 8 and the bottom plate 1 are spliced. A plurality of plug holes 5 are provided on the bottom plate 1 at equal intervals around the peripheral wall of the bottom plate 1;

[0046] There are multiple fixing piles 9, which can be inserted into the cavity of the prepared sand-blocking board along the longitudinal direction through each insertion hole 5, and adjacent fixing piles 9 are arranged at equal intervals, and are used to hang the fiber mesh cloth layer in the sand-blocking board on each fixing pile 9 to flatten and apply prestress. The cross-sectional diameter of the fixing pile 9 inserted into the cavity is at least 3-4mm, and the cross-sectional area of ​​the fixing pile 9 in the cavity should be smaller than the diameter of the insertion hole 5.

[0047] In this embodiment, in order to solve the problem in the prior art that when preparing the sand blocking board, the fiber mesh cloth 11 corresponding to the size of the sand blocking board is only loosely laid between adjacent fine sand layers, the elasticity of the fiber mesh cloth 11 cannot be applied, so that the prepared sand blocking board cannot be made denser, and the bending and folding properties per unit area of ​​the prepared sand blocking board are not good. In order to improve the bending and folding properties of the sand blocking board, the thickness of the sand blocking board must be increased, which not only causes the waste of materials for preparing the sand blocking board, but also causes the sand blocking board to be The problem that the thickness is too thick is not conducive to construction. In order to solve the above problem, the present invention provides a mold suitable for preparing a prestressed fiber mesh cloth sand barrier. The mold can basically solve the above problem. When using it, first calculate in advance how much prestress is required to be applied to the fiber mesh cloth 11 that has been cut to size, and then according to different prestresses, the fixing piles 9 are passed from bottom to top in the vertical direction through the sockets 5 on the bottom plate 1 for setting the prestress, and the fixing piles 9 are installed on the sockets 5, and then the mixed powder and fine sand mixture is spread on the bottom plate 1 and the barrier. The sand-blocking board formed by the combination of the sand board mold frame 8 is prepared in the cavity as the bottom layer of the sand-blocking board, and then the meshes in the fiber mesh cloth 11 cut to a certain size are set on the fixed piles 9 to ensure that the number of meshes between two adjacent fixed piles 9 is equal, which is used to ensure that the fiber mesh cloth 11 is evenly stressed and laid flat on the bottom sand-blocking board, and then a powder-fine sand mixture is laid on the fiber mesh cloth 11 to form the middle layer of the sand-blocking board, and then the laying of the above-mentioned fiber mesh cloth is repeated, and after it is tensioned on the fixed piles 9, the powder-fine sand mixture is laid on the bottom and the middle layer of the sand-blocking board is formed. Multiple layers can be laid in sequence on the second tensioned fiber mesh cloth 11 on the top, but the most widely used sand-blocking board is generally to lay three layers of desert aeolian sand cement-based material casting layers 10 and lay a layer of fiber mesh cloth 11 in the adjacent desert aeolian sand cement-based material casting layers 10. The laying thickness of each layer of desert aeolian sand cement-based material casting layer can be adjusted according to the actual engineering application environment. After the sand-blocking board is formed, it needs to be inverted and demolded in the sand-blocking board mold to form a sand-blocking board with holes. The fixed piles can also be cut and retained in the sand-blocking board.

[0048] Furthermore, in order to facilitate demoulding and carrying, the sand blocking plate mold frame 8 includes a first U-shaped frame 2;

[0049] The second U-shaped frame 3 has an opening opposite to the opening of the first U-shaped frame 2 , and the second U-shaped frame 3 is arranged outside the first U-shaped frame 2 and connected by multiple bolts 4 , and the bottom plate 1 is arranged on the lower opening of the frame surrounded by the first U-shaped frame 2 and the second U-shaped frame 3 .

[0050] When in use, the bottom plate 1 welded at the lower opening of the first U-shaped frame 2 or the bottom plate 1 anchored in the first U-shaped frame 2 is spliced ​​with the first U-shaped frame 2 and the second U-shaped frame 3. The side view of the second U-shaped frame 3 is L-shaped, and one side edge of the bottom plate 1 abuts against the slot set on the second U-shaped frame 3. Then, a plurality of bolts 4 are used to fix them, so that the first U-shaped frame 2, the second U-shaped frame 3 and the bottom plate 1 are enclosed to form a cavity for preparing a sand-blocking plate.

[0051] Furthermore, a method is provided in which a plurality of fixing piles 9 are inserted into different insertion holes 5 at the same distance, so that the fiber mesh cloth 11 of the same size can have different prestresses, and is used to facilitate obtaining a series of sand-blocking boards with fiber mesh cloths 11 of different prestresses; the interval between two adjacent insertion holes 5 is at least 5-10 cm, and each fixing pile 9 is inserted into a different insertion hole 5, so that different prestresses can be applied to the fiber mesh cloth in the sand-blocking board.

[0052] Furthermore, in order to prevent slurry waste on the one hand and to prevent the change of sand barrier strength due to slurry leakage on the other hand, each insertion hole 5 where the fixed pile 9 is not inserted is covered with a shielding layer for preventing slurry leakage, and the shielding layer is one of paper (kraft paper) or plastic film.

[0053] Furthermore, in order to facilitate demoulding, the fixed piles 9, the sand blocking board mold frame 8 and the bottom plate 1 are all made of metal materials or hard plastics with smooth surfaces. The metal material is any one of steel plates or iron plates. The bottom plate 1 and the sand blocking board mold frame 8 are both 1-2 mm thick, in order to facilitate the molding of the sand blocking board and easy operation.

[0054] Furthermore, the fixing piles 9, the sand blocking plate mold frame 8 and the bottom plate 1 are coated with grease for easy demoulding, and the grease is one or more of waste engine oil, diesel, engine oil or vegetable oil.

[0055] Furthermore, the specific structure of the fixing pile 9 is given, and the fixing pile 9 includes

[0056] The pile body 6 is inserted into the cavity through the insertion hole 5 in the longitudinal direction and is used to hang the fiber mesh cloth;

[0057] The fixing member 7 is arranged at the lower end of the pile body 6 , and the fixing member 7 is snap-fitted or threadedly connected to the insertion hole 5 .

[0058] During use, the pile body 6 is passed through the insertion hole 5 in the longitudinal direction into the cavity, and then the fixing member 7 is snap-fitted or threadedly connected to the insertion hole, so that the fixing pile 9 can be reused.

[0059] A method for applying prestress to a prestressed fiber mesh cloth sand barrier plate mold comprises the following steps:

[0060] S1: Splice the sand-blocking plate mold frame 8 and the bottom plate 1, and then insert each fixing pile 9 into each set socket 5 according to the different prestressing force set, and apply grease on the inner wall of the mold. The grease is generally one or more of waste engine oil, diesel, engine oil or vegetable oil, and cover the unused sockets 5 on the bottom plate 5 with paper or plastic film;

[0061] S2: wherein each cubic meter of the desert aeolian sand cement-based material mixture is made by mixing a desert aeolian sand mass fraction of 60-65%, a water mass fraction of 18-20%, and a cement mass fraction of 20-23%. The desert aeolian sand cement-based material mixture is spread flat on the bottom plate 1 of the mold cavity. After pouring, the surface is ensured to be flat without obvious bumps and bumps by means of vibration and the like. Then, the fiber mesh cloth 11 cut to a certain size with the same grid spacing is hung on the fixed piles 9, and is stretched and spread flat on the bottom layer of the sand-proof board, so that the fiber mesh cloth 11 generates 0.5-1.0 kg of prestress in the horizontal direction and 1.0-2.0 kg of prestress in the vertical direction. The fiber mesh cloth 11 is tightly attached to the bottom layer of the desert aeolian sand cement-based material casting layer without any gaps, and is stretched and tightened without any relaxation. After the layer of fiber mesh cloth 11 is fixed, the sand is continued to be poured. The desert aeolian sand cement-based material is evenly compacted and scraped flat, the middle part can be slightly higher and the edge part can be slightly lower, and then a cut fiber mesh cloth 11 is tensioned to make the fiber mesh cloth 11 produce 0.5-1.0kg prestress in the horizontal direction and 1.0-2.0kg prestress in the vertical direction, and is hung on the fixed pile 9. The fiber mesh cloth 11 should be in close contact with the desert aeolian sand cement-based material casting layer in the middle of the mold without any gaps, and the tensioning should not cause relaxation. After the fiber mesh cloth 11 is in close contact, a desert aeolian sand cement-based material casting layer is poured on it, and compacted and smoothed. The desert aeolian sand cement-based material mixture and the fiber mesh cloth 11 are repeatedly laid from bottom to top to prepare a prestressed sand-blocking plate, ensuring that the prestress applied to each layer of fiber mesh cloth is 9-35N / mm, that is, each millimeter of fiber mesh cloth can apply a maximum prestress of 0.92-3.57kg;

[0062] S3: After the formwork is completed, the top layer is covered with a curing film and cured to the specified age;

[0063] S4: Remove the mold after reaching 70% of the design strength. The order of mold removal is: pull out the pile body from the fixed end; unscrew the connecting bolts and remove the second U-shaped frame 3, take out the formed test piece, and place it properly; clean the mold.

[0064] The specific size of the mold is built according to actual needs. The present invention takes a mold with a length of 1m, a width of 30cm, and a height of 3cm as an example. The mold material is made of one of the thicknesses of iron sheet or hard plastic, wherein the thickness of the bottom plate 1 and the sand-blocking plate mold frame 8 is preferably 1-2mm. In order to facilitate the demolding of the sand-blocking plate, the second U-shaped frame 3 is detachably connected to the first U-shaped frame 2 by bolts. In order to ensure the airtightness of the mold, the side wall cross-section of the second U-shaped frame 3 is "L"-shaped. The fixed pile 9 requires a harder material texture to prevent bending and deformation when prestress is applied, and a smooth surface to facilitate demolding later. The specific size of the fixed pile 9 is determined according to the mesh aperture size of the fiber mesh cloth 11. In the present invention, the diameter of the fixed pile 9 in the cavity is preferably 3-4mm, and the length is ≥5cm. The diameter of the fixed pile 9 in the cavity is smaller than the diameter of the plug hole 5 on the bottom plate 1.

[0065] After the mold is installed, the sand-blocking plate mold frame 8, the bottom plate 1 and the fixing piles 9 need to be coated with grease for easy demoulding. The grease can be waste engine oil, diesel, motor oil, vegetable oil, etc., or a combination thereof.

[0066] The number and thickness of the desert aeolian sand cement-based material casting layer are determined according to actual needs. The present invention has three layers, and the thickness of each layer is 8-15mm. The number and size of the prestressed fiber mesh cloth are determined according to actual needs. Since the fiber mesh is arranged between two adjacent layers of desert aeolian sand cement-based material casting layers, when the desert aeolian sand cement-based material casting layer is three layers, the fiber mesh cloth 11 of the present invention is arranged in two layers, and the aperture side length of the square grid in each layer of the fiber mesh cloth 11 is 4-6.7mm, and the unit area weight of each layer of the fiber mesh cloth 11 is 46-162g / m 2 , the breaking strain of each layer of fiber mesh cloth 11 is not more than 5%, and the glue content is 13%-15%. It is stretched and hung on each fixed pile 9, and the number of mesh grids between two adjacent fixed piles 9 is the same. The fixed pile 9 selects a suitable socket 5 according to the setting requirements of different sizes of prestress. The present invention sets a fixed pile 9 every 20cm. According to the fiber mesh cloth 11 of different specifications, no more than 29-48 square grids are set between every two fixed piles 9 during the tensioning process. The maximum prestress is 9-35N / mm, that is, each millimeter of fiber mesh cloth 11 can apply a maximum prestress of 0.92-3.57kg. Then cover the desert aeolian sand cement-based material on the top layer of the mold with a curing film (tarpaulin) or a plastic sheet (plastic film). To ensure that the prestress takes effect, the curing and demolding time shall not be less than 7 days.

[0067] The above disclosure is only a preferred embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A prestressed fiber mesh cloth sand barrier plate mold, characterized in that: include A sand blocking plate mold frame (8), the sand blocking plate mold frame (8) comprising A first U-shaped frame (2); A second U-shaped frame (3), the opening of which is arranged opposite to the opening of the first U-shaped frame (2), and the second U-shaped frame (3) is arranged outside the first U-shaped frame (2) and connected via a plurality of bolts (4); The bottom plate (1) is arranged on the lower opening of the frame body surrounded by the first U-shaped frame (2) and the second U-shaped frame (3), and is used to form a cavity for preparing the sand blocking plate after the first U-shaped frame (2), the second U-shaped frame (3) and the bottom plate (1) are spliced ​​together. A plurality of plug holes (5) are provided on the bottom plate (1) at equal intervals around the peripheral wall of the bottom plate (1), and the interval between two adjacent plug holes (5) is at least 5-10 cm; There are a plurality of fixing piles (9) which can be respectively inserted into the cavity of the sand blocking plate in the longitudinal direction through the respective insertion holes (5), and the adjacent fixing piles (9) are arranged at equal intervals, and are used to hang the fiber mesh cloth (11) in the sand blocking plate on the fixing piles (9) to flatten it and apply prestress. The fixing piles (9) are inserted into different insertion holes (5), and different prestresses can be applied to the fiber mesh cloth (11) in the sand blocking plate.

2. A prestressed fiber mesh sand barrier plate mold according to claim 1, characterized in that: Each insertion hole (5) not inserted with a fixing pile (9) is covered with a shielding layer for preventing slurry from leaking, and the shielding layer is one of paper or plastic film.

3. A prestressed fiber mesh sand barrier plate mold according to claim 1, characterized in that: The fixing piles (9), the sand blocking plate mold frame (8) and the bottom plate (1) are all made of metal material or hard plastic with a smooth surface.

4. A prestressed fiber mesh sand barrier plate mold according to claim 1, characterized in that: The fixed piles (9), the sand blocking plate mold frame (8) and the bottom plate (1) are also coated with grease for easy demoulding, and the grease is one or more of waste engine oil, diesel, engine oil or vegetable oil.

5. The prestressed fiber mesh cloth sand barrier plate mold according to claim 1, characterized in that: The fixing pile (9) comprises The pile body (6) is inserted into the cavity through the insertion hole (5) in the longitudinal direction and is used for hanging the fiber mesh cloth; The fixing member (7) is arranged at the lower end of the pile body (6), and the fixing member (7) is snap-fitted or threadedly connected to the insertion hole (5).

6. The method for applying prestress to a prestressed fiber mesh cloth sand barrier plate mold according to claim 1, characterized in that: The steps include: S1: splicing the sand-blocking plate mold frame (8) and the bottom plate (1), then inserting each fixing pile (9) into each set plug hole (5) according to the different prestressing forces set, applying grease on the inner wall of the mold, and covering each unused plug hole (5) on the bottom plate (1) with paper or plastic film; S2: Laying the desert aeolian sand cement-based material mixture on the bottom plate (1) of the mold cavity, then hanging the fiber mesh cloth (11) cut to a certain size with the same grid spacing on the fixed pile (9), and stretching and laying it on the bottom layer of the sand-proof board, and then laying the desert aeolian sand cement-based material mixture again, so that a layer of fiber mesh cloth is stretched and laid between the two layers of desert aeolian sand cement-based material mixture, and repeatedly laying the desert aeolian sand cement-based material mixture and the fiber mesh cloth (11) from bottom to top to prepare a prestressed sand-proof board, wherein each cubic meter of the desert aeolian sand cement-based material mixture is made of a mixture of desert aeolian sand with a mass fraction of 60-65%, water with a mass fraction of 18-20%, and cement with a mass fraction of 20-23%, and the maximum prestress set is 9-35N / mm, that is, each millimeter of fiber mesh cloth can apply a maximum prestress of 0.92-3.57kg; S3: After the mold is installed, the top layer is covered with a curing film; S4: Remove the mold.

7. The method for applying prestress to a prestressed fiber mesh sand barrier plate mold according to claim 6, characterized in that: The fiber mesh cloth (11) is hung on a fixed pile (9) and tensioned, so that the fiber mesh cloth (11) generates 0.5-1.0 kg of prestress in the transverse direction and 1.0-2.0 kg of prestress in the longitudinal direction.

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