CN217078491U - Liftable sand-blocking barrier - Google Patents

Abstract

The utility model relates to a can promote and hinder sand barrier, this can promote and hinder sand barrier includes two interconnect's the sand board that hinders at least, it sets up to hinder sand board perpendicular to ground, and hinder at least partly the bury of sand board and press in below ground, it is provided with the lifting unit on the sand board to hinder, the lifting unit is used for hindering when the sand board is buried by the deposition sand, upwards lift and hinder the sand board, make its upper portion expose from the deposition sand more, thereby can continue to hinder husky function, reach and prolong the life's that can promote and hinder sand barrier purpose by a wide margin, can also reduce construction cost. Simultaneously, the structure of lifting unit is comparatively simple, and the construction is more convenient and fast.

Description

Liftable sand barrier

Technical Field

The application relates to the technical field of sand prevention and blocking, in particular to a liftable sand blocking barrier.

Background

Land desertification is one of the most serious ecological problems faced by China, not only influences the ecological environment, but also destroys the production conditions of agriculture and industry, and causes great harm to national economy and social sustainable development.

The sand damage prevention and control mainly adopts the measures of sand blocking and sand fixing. The sand-blocking measure is a high vertical sand-blocking barrier which is built by single or multiple materials and is used for building a 'defense line' and blocking external drift sand, when a wind sand flow is blocked by the sand-blocking barrier, the wind speed is reduced, the drift sand is deposited in front of and behind the sand-blocking barrier, and internal facilities are protected from being buried and pressed.

The high vertical sand-blocking barrier adopted at present mainly comprises a soil sand-blocking wall, a brick sand-blocking wall, a stone sand-blocking wall, a concrete plate sand-blocking wall, a wood plate sand-blocking wall, a plastic plate sand-blocking wall, a waste sleeper sand-blocking wall, a film-coated mesh bag sand-blocking wall, a composite material blanket sand-blocking wall, a wood lath fence, a bamboo fence, a wattle fence, a plant branch fence, a fiber sand-blocking net and the like. The sand accumulation effect is obvious, and the method is applied to sand damage control. However, when the height of the accumulated sand reaches the top of the sand-blocking barrier, the sand-blocking barrier loses the sand-blocking function, and the sand-blocking barrier needs to be reset. Therefore, the existing sand barrier has the problems of short service life and high construction cost.

SUMMERY OF THE UTILITY MODEL

The application provides a can promote and hinder sand barrier to solve above-mentioned current sand barrier life hangs down, problem that construction cost is high.

The embodiment of the application provides a liftable sand barrier, which at least comprises two mutually connected sand blocking plates;

the sand blocking plate is arranged perpendicular to the ground, and at least part of the sand blocking plate is buried under the ground;

the sand blocking plate is provided with a lifting assembly, and the lifting assembly is used for lifting the sand blocking plate upwards when the sand blocking plate is buried by accumulated sand.

In one possible design, the lifting assembly includes a lifting rod fixed to an upper end of the sand blocking plate and a lifting ring fixedly connected to the upper end of the lifting rod.

In a possible design, reinforcing rods extending along the height direction of the sand blocking plate are further arranged on two sides of the sand blocking plate, and the upper ends of the two reinforcing rods are vertically fixed with the lower ends of the lifting rods.

In one possible design, the parts of the two adjacent sand blocking plates exposed out of the ground are detachably connected through a connecting piece.

In a possible design, the part of the sand-blocking plate exposed out of the ground is also provided with a plurality of uniformly distributed ventilation holes.

In one possible design, the porosity of the sand guard is 20% to 30%.

In one possible design, the ventilation holes are any one of rectangular holes, circular holes, and diamond-shaped holes.

In one possible design, the height H1 of the sand blocking plate is 700mm-2500mm, and the width D1 of the sand blocking plate is 300mm-2500 mm.

In one possible design, the height L2 of the sand stop plate buried below the ground is 300mm-1200 mm.

In one possible design, the lifting ring is semi-circular.

In this application, can promote and hinder sand barrier and connect by the sand board that hinders more than two and constitute, can adjust according to the length of topography and improvement sand blown by the wind area, the flexibility is higher. The lower part of the sand blocking plate is buried and pressed below the ground, and the upper part of the sand blocking plate is exposed out of the ground and used for blocking wind and sand. Along with the increase of the height of the quicksand deposition, when the sand blocking plate is buried to a certain height, the sand blocking plate can be lifted upwards through the lifting assembly, so that the upper part of the sand blocking plate is more exposed out of accumulated sand, the sand blocking function can be continued, the purpose of prolonging the service life of the liftable sand blocking barrier is achieved, and the construction cost can be reduced. Simultaneously, the structure of lifting unit is comparatively simple, and the construction is more convenient and fast.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic structural view of a liftable sand barrier according to a first embodiment of the present invention;

FIG. 2 is a schematic structural view of the sand blocking plate shown in FIG. 1;

FIG. 3 is a schematic diagram of a second embodiment of a liftable sand barrier according to the present application;

fig. 4 is a schematic structural view of the sand blocking plate in fig. 3.

Reference numerals are as follows:

1-a sand blocking plate;

11-ventilation holes;

12-a connector;

2-reinforcing rods;

21-a second fixing member;

3-a lifting assembly;

31-a lifting bar;

32-a lifting ring;

33-a first fixing member;

4-the ground;

x-the width direction of the sand blocking plate;

y-height direction of the sand blocking plate.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The embodiment of the application provides a liftable sand barrier, as shown in fig. 1 to 4, the liftable sand barrier at least comprises two mutually connected sand blocking plates 1, the sand blocking plates 1 are arranged perpendicular to the ground 4, at least part of the sand blocking plates 1 are buried below the ground 4, lifting assemblies 3 are arranged on the sand blocking plates 1, and the lifting assemblies 3 are used for lifting the sand blocking plates 1 upwards when the sand blocking plates 1 are buried by accumulated sand.

In the embodiment, the liftable sand-blocking barrier is formed by connecting more than two sand-blocking plates 1, can be adjusted according to the terrain and the length of a wind sand control belt, and is high in flexibility. As shown in the embodiment of fig. 1, the lower part of the sand-blocking plate 1 is buried below the ground 4, and the upper part is exposed out of the ground for blocking wind and sand, when wind contacts the surface of the sand-blocking plate 1, the wind speed can be reduced due to the blocking of the sand-blocking plate 1, so that the quicksand is deposited in front of and behind the sand-blocking plate 1. Along with the increasing of the height of the quicksand deposition, when the sand blocking plate 1 is buried to a certain height, the sand blocking plate 1 can be lifted upwards through the lifting assembly 3, so that the upper part of the sand blocking plate is more exposed out of accumulated sand, the sand blocking function can be continued, the purpose of prolonging the service life of the liftable sand blocking barrier is achieved, and the construction cost can be reduced. Meanwhile, the structure of the lifting assembly 3 is simple, and construction is rapid and convenient.

Wherein, the sand-blocking plate 1 can be made of PE plate, fiber plate and other materials; the lifting component 3 can be made of hot-galvanized steel bars, galvanized square tubes, wood bars, flat irons, high-strength plastic tubes and the like.

In a specific embodiment, as shown in fig. 2 and 4, the lifting assembly 3 comprises a lifting rod 31 and a lifting ring 32, the lifting rod 31 is fixed on the upper end of the sand blocking plate 1, and the lifting ring 32 is fixedly connected with the upper end of the lifting rod 31. Wherein the lifting ring 32 is semi-circular.

In this embodiment, the lifting rod is horizontally arranged along the width direction X of the sand blocking plate 1, the length of the lifting rod 31 is equal to the width of the sand blocking plate 1, the upper edge of the lifting rod 31 is aligned with the upper edge of the sand blocking plate 1, and is fixedly connected with the sand blocking plate through the first fixing member 33, and the lifting ring 32 is fixedly connected with the upper end of the lifting rod 31 through welding. As shown in fig. 2 and 4, the lifting ring 32 is disposed at the middle position of the lifting rod 31, and the distances from the two ends of the lifting rod 31 are equal, when the width D1 of the sand blocking plate 1 is large, a plurality of lifting rings 32 can be disposed on the lifting rod 31 at intervals, so that it can be ensured that the lifting rod 31 is uniformly stressed during the process of lifting the sand blocking plate 1 upwards by using the lifting rings 32, and the lifting of the sand blocking plate 1 is more convenient and labor-saving. In this embodiment, the distance L2 between the end portions of the lifting ring 32 and the lifting rod 31 is 150mm, which is convenient for installation and can reduce the lifting difficulty of the sand control plate 1.

Specifically, as shown in the embodiment of fig. 2, the lifting ring 32 has a semicircular structure, and the diameter D2 of the semicircular structure is 200mm, so that it is convenient to insert a tool into the lifting ring 32, and the lifting difficulty of the sand control plate 1 is further reduced.

In addition, the lifting rod 31 can be made of galvanized square pipes with the size of 30mm multiplied by 2mm, the lifting ring 32 can be made of hot galvanized steel bars with the diameter of 10mm, the steel bar has strong corrosion resistance and high strength, the deformation resistance of the sand blocking plate 1 can be enhanced, the first fixing piece 33 can be a self-tapping screw, the installation is convenient, the cost is low, and the construction cost of the lifting assembly 3 can be reduced.

In a specific embodiment, as shown in fig. 2, reinforcing rods 2 extending in the height direction Y of the sand blocking plate 1 are further provided on both sides of the sand blocking plate 1, and the upper ends of both reinforcing rods 2 are vertically fixed to the lower ends of the lifting rods 31.

In this embodiment, the reinforcing rods 2 are arranged on two sides of the sand blocking plate 1 in parallel, so that the strength of the sand blocking plate 1 can be improved, and the sand blocking plate 1 can keep upright in the using process. Wherein, the reinforcing rod 2 passes through second mounting 21 and hinders sand board 1 fixed connection, and the upper end of the reinforcing rod 2 of both sides all with the lower extreme welded fastening of lift bar 31. Specifically, the distance L1 between the center of the reinforcing bar 2 and the end of the lifting bar 31 is 50mm, which facilitates the installation and fixation, and further improves the connection strength of the reinforcing bar 2.

Specifically, the second fixing member 21 may be a horsecard, a bolt, a rivet, or the like, and has low cost and high connection strength, so as to prevent the reinforcing rod 2 from falling off the sand blocking plate 1.

In addition, in this application, the material of the reinforcing rod 2 may be a hot-dip galvanized steel bar, a galvanized square pipe, a batten, a flat iron, a high-strength plastic pipe, or the like.

Take the reinforcing bar 2 as a circular tube and the diameter D3 is equal to 10mm as an example:

in the embodiment shown in fig. 1 and 2, when the wind power is 8 grades (wind speed is 17.2-20.7m/s, at 20.7m/s), the porosity of the sand-repellent plate 1 is 20%, when:

wind pressure Wp ═ 20.7X 20.7)/1600 ═ 0.27kN/m ²

Since the width of the sand blocking plate 1 is 0.5m and the height thereof is 1.5m,

therefore, the sand-blocking plate 1 is stressed by 0.27 × 0.5 × 1.5 mx (1-20%) under 0.16kN

The stress Q of the reinforcing rod 2 is 1/2 and F is 0.08kN

Tests show that the bending strength of the hot-galvanized steel bars with the diameter of 10mm is greater than 0.1kN, so that the reinforcing rods 2 on the two sides of the sand prevention plate 1 can meet the strength requirement of the sand prevention plate 1 by selecting the hot-galvanized steel bars with the diameter D3 of 10 mm.

In the embodiment shown in fig. 3, when the wind power is 8 grades (wind speed 17.2-20.7m/s, at 20.7m/s), the porosity of the anti-drag sand plate 1 is 20%, when:

wind pressure Wp ═ 20.7X 20.7)/1600 ═ 0.27kN/m ²

Since the width of the sand blocking plate 1 is 1m and the height thereof is 1m,

therefore, the sand-blocking plate 1 is stressed by a pressure F which is 0.27 multiplied by 1m multiplied by (1-20%) which is 0.2kN

The stress Q of the reinforcing rod 2 is 1/2 & F is 0.1kN

Through tests, the bending strength of the hot-galvanized steel bars with the diameter of 10mm is larger than 0.1kN, so that the reinforcing rods 2 on the two sides of the sand-blocking plate 1 can meet the strength requirement of the sand-blocking plate 1 by selecting the hot-galvanized steel bars with the diameter D3 of 10 mm. In this application, the reinforcing bar 2 chooses diameter D3 for use to be 10 mm's hot dip galvanized steel bar, can provide reliable support for hindering husky board 1, improves the bending strength who hinders husky board 1 to satisfy the intensity demand that hinders husky board 1. In addition, the reinforcing rod 2 after surface galvanization has stronger corrosion resistance, and the service life of the reinforcing rod 2 in a sand environment is prolonged, so that the service life of the sand blocking plate is prolonged, and the use cost of the liftable sand blocking barrier is further reduced.

In a specific embodiment, as shown in fig. 1 and 3, the exposed parts of the two adjacent sand blocking boards 1 on the ground 4 are detachably connected through a connecting piece 12.

In this embodiment, two adjacent sand blocking plates 1 are fixedly connected through a connecting piece 12, so that the structure is simple and the installation is convenient. Specifically, before the sand-blocking plate 1 is constructed, a groove is dug in the ground 4 of a sand damage site, then the sand-blocking plate 1 is vertically placed in the groove, the parts of the two adjacent sand-blocking plates 1 exposed out of the ground 4 are connected through the connecting piece 12, then the lower parts of the sand-blocking plates 1 are buried and pressed and fixed by sand, and the sand-blocking plates 1 are connected with each other to form the liftable sand-blocking barrier provided by the application. Wherein, the two ends of the connecting piece 12 can be respectively fixed on the reinforcing rods 2 of the two adjacent sand blocking plates 1, thereby realizing the fixed connection of the two adjacent sand blocking plates 1. Or, as shown in the embodiment of fig. 1, two ends of the connecting member 12 are respectively and directly fixed on two adjacent sand blocking plates 1, so as to realize the fixed connection of the two adjacent sand blocking plates 1.

Under natural environment, after a period of time, both sides all can be long-pending husky around this liftable hinders sand barrier, because the long-pending husky degree difference of different district section is great, lead to the husky board 1 that hinders of different district section by the degree that long-pending husky buried pressure also inequality, at this moment, can adjust the height that hinders husky board 1 that upwards promotes according to particular case. When the sand blocking plate 1 at a certain position needs to be lifted, the connection between the sand blocking plate 1 at the lifting section and the sand blocking plate 1 beside the lifting section is released, then the sand blocking plate 1 at the lifting section is lifted upwards to a required height through the lifting ring 32, and then the sand blocking plate 1 at the lifting section and the sand blocking plates 1 at two sides are reconnected according to the current height difference, therefore, in the application, when the sand blocking plate 1 is accumulated to a certain height, only the sand blocking plate 1 in the area needs to be lifted, and when a certain sand blocking plate 1 is damaged, only the sand blocking plate 1 needs to be replaced independently, so that the construction difficulty and the construction cost can be reduced.

Wherein, connecting piece 12 can be stainless steel two riding horse card, iron wire, rivet, bolt etc. for the installation and the dismantlement of being convenient for can promote and hinder the construction of sand barrier convenient and fast more.

In a specific embodiment, as shown in fig. 2 and 4, the portion of the sand blocking plate 1 exposed to the ground 4 is further provided with a plurality of uniformly distributed ventilation holes 11.

In this embodiment, the portion of the sand blocking plate 1 exposed to the ground 4 is subjected to wind resistance, which causes an excessive pressure on the surface of the sand blocking plate 1. Therefore, a plurality of ventilation holes 11 need to be formed to allow wind to penetrate through the ventilation holes 11, so that wind resistance is reduced, the choke plate 1 is prevented from being blown by wind, and the service life of the choke plate 1 is prolonged. In addition, sand and soil can also pass through the ventilation holes 11 and is accumulated on the other side of the sand blocking plate 1, so that the sand blocking plate 1 is prevented from toppling over due to excessive accumulated sand on one side of the sand blocking plate 1.

The shape and size of the ventilation holes 11 are not limited, and the ventilation holes may be rectangular, circular, rhombic or other shapes, and the sizes of the ventilation holes 11 may be the same or different. Rectangular holes are used in this application.

It should be noted that the ventilation holes 11 are only disposed at the portion of the sand-blocking plate 1 exposed to the ground, and the ventilation holes 11 are not disposed in the range of 50mm-150mm at the upper end portion and the left and right end portions of the sand-blocking plate 1, so as to avoid affecting the installation of the lifting assembly 3 and the reinforcing rod 2.

Specifically, the porosity of the sand blocking plate 1 is 20% -30%. Specifically, the porosity may be 20%, 25%, 30%, and so on.

In this embodiment, the porosity of the sand-blocking plate 1 is 20% to 30%, that is, the ratio of the total area of the ventilation holes 11 on the sand-blocking plate 1 to the area of the sand-blocking plate 1 is 20% to 30%. When the porosity of the sand blocking plate 1 is too small (for example, less than 20%), the wind permeability of the sand blocking plate 1 is small, so that the surface of the sand blocking plate 1 is subjected to too large wind resistance, the sand blocking plate 1 is prone to toppling, and the sand blocking effect is lost; when the porosity of the sand blocking plate 1 is excessively large (for example, more than 30%), the strength of the sand blocking plate 1 is reduced and the surface is easily broken. Therefore, when the porosity of the sand blocking plate 1 is 20% -30%, the strength of the sand blocking plate can be ensured, the service life of the sand blocking plate 1 is prolonged, and meanwhile, the wind permeability of the sand blocking plate 1 can reach 40% -50% so as to reduce the surface wind resistance of the sand blocking plate 1 and meet the requirement of the sand blocking plate 1 on reducing the wind resistance.

In a specific embodiment, the height H1 of the sand blocking plate 1 is 700mm-2500mm, and the width D1 of the sand blocking plate 1 is 300mm-2500 mm. Specifically, the height H1 of the sand blocking plate 1 may be 700mm, 1300mm, 1900mm, 2500mm, etc., and the width D1 of the sand blocking plate 1 may be 300mm, 1000mm, 1700mm, 2500mm, etc. Wherein, the height H2 of the sand-blocking board 1 buried under the ground 4 is 300mm-1200 mm. Specifically, H2 may be 300mm, 600mm, 900mm, 1200mm, and so forth.

As shown in figures 1 and 2, this embodiment provides a liftable sand barrier consisting of a sand blocking panel 1 having a height H1 of 1500mm and a width D1 of 500 mm. The height H2 of the sand blocking plate 1 buried below the ground 4 is 500mm, that is, the height exposed to the ground 4 is 1000 mm. When the part of the sand-blocking plate 1 exposed out of the ground 4 is buried by the accumulated sand for 500mm,

according to the lateral pressure calculation formula p ═ rho g.h (the wind sand density rho is 1650kg/m ³ The gravity acceleration g is 9.8N/kg, and h is pressureHeight from point to apex)

At this time, the maximum side pressure p was 1650kg/m ³ ×9.8N/kg×1m＝16170Pa

Average lateral pressure F1/2 · p · S1/2 × 16170Pa × 1 × 0.5m 4042.5N

Lifting force F _{Massage device} Mu F (friction coefficient mu of sand-blocking board 1 is 0.12)

Therefore F _{Massage device} ＝0.12×4042.5N＝485.1N

The pulling force is equal to the friction force, so the pulling force is more than or equal to 485.1N, namely the pulling force of 49.5kg is applied to the sand-blocking plate 1, and the sand-blocking plate can be lifted upwards. Therefore, in this embodiment, when the sand accumulation burying height of the sand preventing plate 1 reaches 500mm, a tool is inserted into the lifting ring 32, and 2 persons can pull out the sand preventing plate 1 buried with sand completely and reliably.

As shown in fig. 3 and 4, another embodiment provides a liftable sand barrier consisting of a sand-blocking plate 1 with a height H1 of 1000mm and a width D1 of 1000mm, wherein the height H2 of the sand-blocking plate 1 buried under the ground 4 is 300mm, that is, the height exposed to the ground 4 is 700 mm. When the part of the sand-blocking plate 1 exposed out of the ground 4 is buried by the accumulated sand for 400mm,

maximum lateral pressure p is 1650kg/m ³ ×9.8N/kg×0.7m＝11319Pa

Average lateral pressure F1/2 · p · S1/2 × 11319Pa × 0.7 × 1m 3961.65N

So the lifting force F _{Massage device} ＝μF＝0.12×3961.65N＝475.4N

The pulling-out force is equal to the friction force, so the pulling-out force is greater than or equal to 475.1N, namely the pulling force of 48.5kg is applied to the sand-blocking plate 1, and the sand-blocking plate can be lifted upwards. Therefore, in this embodiment, when the sand accumulation burying height of the sand-blocking plate 1 reaches 400mm, a tool is inserted into the lifting ring 32, and 2 persons can pull out the sand-blocking plate 1 buried with sand completely and reliably.

To sum up, when the height H1 of the sand blocking plate 1 meets 700mm-2500mm, the width D1 meets 300mm-2500mm, and the height H2 of the sand blocking plate 1 buried below the ground 4 meets 300mm-1200mm, the sand blocking plate 1 is simple to install, convenient and labor-saving in lifting, construction requirements can be met, and construction cost is reduced.

The sand blocking plate 1 is an HDPE (high density polyvinyl chloride) plate with the thickness of 2.5mm, which is prepared through the steps of material preparation, drying, extrusion, calendaring, punching, drying and detection of the conventional procedures, and has the advantages of light weight and convenience in carrying. The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A liftable sand barrier, characterized in that it comprises at least two interconnected sand blocking plates (1);

the sand blocking plate (1) is arranged perpendicular to the ground (4), and at least part of the sand blocking plate (1) is buried below the ground (4);

the sand blocking plate is characterized in that a lifting assembly (3) is arranged on the sand blocking plate (1), and the lifting assembly (3) is used for lifting the sand blocking plate (1) upwards when the sand blocking plate (1) is buried by accumulated sand.

2. A liftable sand barrier according to claim 1, characterised in that the lifting assembly (3) comprises a lifting bar (31) and a lifting ring (32);

the lifting rod (31) is fixed at the upper end of the sand blocking plate (1);

the lifting ring (32) is fixedly connected with the upper end of the lifting rod (31).

3. A liftable sand barrier according to claim 2, characterized in that reinforcing bars (2) extending in the height direction (Y) of the sand barrier (1) are also arranged on both sides of the sand barrier (1);

the upper ends of the two reinforcing rods (2) are vertically fixed with the lower end of the lifting rod (31).

4. A liftable sand barrier according to claim 1, characterised in that the parts of two adjacent sand barriers (1) exposed to the ground (4) are detachably connected by means of a connecting element (12).

5. A liftable sand barrier according to claim 4, characterised in that the part of the sand barrier (1) exposed to the ground (4) is provided with a plurality of evenly distributed ventilation holes (11).

6. A liftable sand barrier according to claim 5, characterized in that the porosity of the sand barrier panel (1) is 20-30%.

7. A liftable sand barrier according to claim 6, characterised in that the ventilation holes (11) are any of rectangular, circular or diamond shaped holes.

8. A liftable sand barrier according to any one of claims 1 to 7, characterised in that the height H1 of the sand barrier (1) is 700mm to 2500 mm;

the width D1 of the sand blocking plate (1) is 300mm-2500 mm.

9. A liftable sand barrier according to any one of claims 1 to 7, characterised in that the height H2 at which the sand barrier (1) is buried below the ground (4) is 300mm to 1200 mm.

10. A liftable sand barrier according to any one of claims 2-7, characterised in that the lifting ring (32) is semi-circular.

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