Film-pasted culture pond

Through the spliced ​​plate body and water barrier design, combined with PP material and flange connection, the problem of large investment in traditional aquaculture ponds is solved, and the film aquaculture pond with stability, impact resistance and efficient cleaning is achieved.

CN223286418UActive Publication Date: 2025-09-02HUIZHOU HONEYCOMB BREEDING EQUIP CO LTD
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Patent Information

Application Number
CN202421808401.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-29
Publication Date
2025-09-02
Estimated Expiration
2034-07-29

AI Technical Summary

Technical Problem

Traditional aquaculture ponds are constructed using cement concrete, with large investment and short service life. The waterproof membrane is prone to folding, resulting in difficulty in cleaning, increasing production costs and maintenance difficulties.

Method used

Multiple first plate bodies are spliced ​​to form a closed ring body bracket, combined with the water barrier layer and reinforcement rib design, and a PP water barrier layer and plate body are used to set up sewage outlets and filter mesh, and flange edge connection method to ensure the stability of the structure and sealing performance.

Benefits of technology

It realizes a modular design, which is easy to assemble, disassemble and expand, reduces production costs, improves the stability and impact resistance of the breeding pool, enhances sealing performance and sewage discharge efficiency, reduces stain accumulation, and is easy to clean.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of aquaculture ponds, in particular to a film culture pond which comprises a plurality of first plate bodies and a water-resisting layer, the first plate bodies are spliced end to end to form a closed ring body support, the water-resisting layer is used for being attached to the inner walls of the first plate bodies to effectively block permeation of external moisture, and second plate bodies are arranged at the bottoms of the first plate bodies. The ring body structure is formed by the multiple second plate bodies in a surrounding mode, bottom supporting of the whole structure is further enhanced, the whole structure can bear larger pressure and impact, the service life of the ring body structure is prolonged, and the safety of the ring body structure is improved, and the water-resisting layers comprise the first water-resisting layer arranged on the ring body support and the second water-resisting layer arranged on the ring body structure. The ring body structure is used for enabling the first water-resisting layer and the second water-resisting layer to be attached to effectively prevent water permeation, when parts need to be maintained or replaced, the integrated structure formed by the first plate body and the second plate body can be independently disassembled and replaced, overall disassembly is not needed, and therefore the maintenance cost is reduced, and the maintenance time is shortened.
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Description

Technical Field

[0001] The utility model relates to the technical field of aquaculture ponds, and in particular discloses a film-attached aquaculture pond. Background Art

[0002] Currently, in aquaculture, traditional aquaculture ponds, nursery ponds, and standard stock ponds typically use cement concrete floors, with surrounding walls constructed of bricks, mortar, and cement dams. However, land leases are often short, and according to most existing lease contracts, upon expiration of the lessee's lease term, the buildings on the land become property of the lessor. This results in producers making a large one-time investment, resulting in a short production period and a failure to recoup their initial investment. Furthermore, for aquaculture ponds constructed with cement, some manufacturers often incorporate a waterproof membrane layer to create a more flexible pond. However, this membrane is prone to wrinkling and staining, making it difficult to clean, resulting in lengthy manual cleaning times. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a film-attached aquaculture pond.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a film-attached aquaculture pond, comprising a plurality of first plates and a water-proof layer. The plurality of first plates are spliced ​​end to end to form a closed ring bracket, so that the bracket has a high degree of flexibility and adjustability to meet the needs of different sizes and shapes. The water-proof layer is used to be attached to the inner wall of the first plate body and the bottom surrounded by the closed ring bracket. A second plate body is provided at the bottom of the first plate body. The second plates of the plurality of first plates are surrounded to form a ring structure, which improves the stability and impact resistance of the aquaculture pond. The water-proof layer includes a first water-proof layer provided on the ring bracket and a water-proof layer provided on the ring structure. The second waterproof layer, the ring structure is used to attach the first waterproof layer and the second waterproof layer to each other, and multiple first plates are spliced ​​to form a closed ring. The modular design of the bracket makes the breeding pond easy to assemble, disassemble and expand, reducing production costs and maintenance difficulties. The waterproof layer is used to attach to the inner wall of the first plate body to effectively prevent water from penetrating the first plate body. The second plate body is provided at the bottom of the first plate body, and multiple second plates are surrounded to form a ring structure. The ring structure formed by the second plate bodies can provide a continuous and tight boundary, effectively isolating the penetration of water, and the sealing performance of the waterproof layer ensures that moisture is effectively blocked.

[0005] Furthermore, a plurality of reinforcing ribs are provided on the first plate body, and the plurality of reinforcing ribs are distributed on the first plate body in a parallel array structure. The reinforcing ribs can effectively improve the bending and compression resistance of the first plate body, and ensure the stability of the breeding pond under severe weather or impact of the breeding animals.

[0006] Furthermore, the spacing between adjacent ribs gradually increases from the second plate toward the area away from it, resulting in a more uniform stress distribution when the structure is subjected to external loads. The density of the ribs is higher in areas close to the second plate, effectively absorbing and distributing the stress from the second plate and its surrounding areas. In areas farther from the second plate, where stress is relatively low, the spacing between the ribs is appropriately increased to save material and maintain the overall stability of the structure.

[0007] Furthermore, a third plate body is provided on the second plate body, and the third plate body is used to cooperate with the second plate body to clamp the waterproof layer. The third plate body and the second plate body jointly clamp the waterproof layer, which can form a tighter and more stable clamping of the first waterproof layer and the second waterproof layer, which helps to reduce the gap between the waterproof layer and the second plate body, thereby improving the overall sealing performance, effectively preventing moisture penetration and fixing the waterproof layer so that wrinkles will not be generated due to the impact of water flow, reducing stains caused by wrinkles.

[0008] Furthermore, the second plate body is provided with mounting holes for embedding and fixing the waterproof layer, and the mounting holes are used to cooperate with external bolts to limit the third plate body on the second plate body. The second plate body reduces the overall wrinkles, reduces the stains hidden by the wrinkles, is more conducive to cleaning, and makes the overall cleaning effect better.

[0009] Furthermore, the second aquiclude is provided with a sewage outlet and a filter located at the outlet. The sewage outlet is located at the center of the second aquiclude. The sewage outlet has multiple holes, resulting in a large surface area and multiple channels. This helps to more evenly distribute the sewage flow, reduce blockage during the sewage discharge process, and thus improve sewage discharge efficiency. The sewage outlet is internally provided with a filter. The filter helps to maintain the clean and stable water quality in the aquaculture pond, providing a good growth environment for the aquaculture.

[0010] Furthermore, the ends of the first plates are provided with outwardly folded flanges. Two adjacent first plates are positioned relative to each other via the flanges, making the overall structure more stable and capable of withstanding greater external forces, such as pressure and tension, thereby improving the overall stability of the structure. When subjected to external forces, the flanges can effectively disperse stress and avoid localized damage caused by stress concentration, which helps extend the service life of the first plates and reduce maintenance costs due to structural damage. The flange connection method allows the first plates to be easily disassembled and replaced when necessary. This facilitates the rapid replacement of damaged first plates during equipment or structural upgrades and repairs, reducing time and improving utilization.

[0011] Furthermore, specifically, the dimension of the first waterproof layer in the width direction is not less than the dimension of the first plate body in the width direction, and the width of the first waterproof layer on the first plate body is greater than the first plate body so that the excess first waterproof layer can be attached to the second plate body and limited by the third plate body to effectively reduce wrinkles caused by water impact.

[0012] Furthermore, the first plate is integrally injection molded. The inner wall of the first plate is a smooth surface that facilitates the attachment of the first waterproof layer, and the outer wall of the first plate has reinforcing ribs for enhanced strength. This integral injection molding reduces gaps at the joints, thereby improving the sealing performance of the entire structure, effectively isolating the intrusion of moisture and other harmful substances, and protecting the internal and structural safety. The reinforcing ribs on the outer wall of the first plate, combined with the reinforcement ribs, increase the strength of the outer wall and ensure overall stability.

[0013] Furthermore, the waterproof layer includes PP plastic that is resistant to seawater corrosion. The PP plastic layer is attached to the ring bracket and the ring structure via an adhesive layer. The adhesive layer and the release film used to cover the adhesive layer are provided on the PP plastic layer. The waterproof layer is adhered to the plate body via an adhesive layer. The adhesive layer can be tightly adhered between the waterproof layer and the plate body to form a continuous waterproof barrier. This tight combination reduces the possibility of water penetration and improves the overall waterproof performance. An adhesive layer is also provided on the side of the adhesive layer away from the waterproof layer. During the handling and installation process, the adhesive layer may be subject to friction and scratching. The adhesive layer can provide a protective barrier to cover the release film of the adhesive layer.

[0014] Specifically, the first and second plates are integrally formed, with the second plate being bent from the bottom of the first plate. This integrated structure reduces the risk of structural failure due to loose or damaged connectors. Bent joints typically have greater strength, can withstand greater forces, exhibit greater stability when resisting external forces, and are less susceptible to deformation or damage.

[0015] Furthermore, the adjacent flange edges on the two first plates are fixed by bolts, and the two flange edges are tightly fitted together by bolts to form a strong connection. This connection method can withstand greater tension and pressure to ensure structural stability. When the first plate needs to be disassembled or replaced, it can be easily separated by loosening the bolts, which is convenient for maintenance and inspection.

[0016] Furthermore, the edge of one end of the first waterproof layer is flush with the upper end of the closed ring bracket, and the edge of the other end of the first waterproof layer is flush with the bottom of the closed ring bracket, which is beneficial for preventing the wallpaper from falling off and preventing water loss. The waterproof layer is PP wallpaper, which has excellent waterproof properties. When used as a waterproof layer, it can effectively prevent water penetration and protect the underlying structure from water erosion. PP wallpaper has high density and mechanical strength, excellent scratch resistance and wear resistance, and can withstand scratches and wear in daily use, maintaining the integrity and aesthetics of the waterproof layer. The surface of PP wallpaper is smooth, not easy to stain, and easy to clean and maintain. Stains can be easily removed with a damp cloth or detergent to keep the waterproof layer clean and hygienic.

[0017] Furthermore, the first plate is made of PP sheet or engineering plastic. PP sheet is a lightweight material and has high mechanical strength, including yield strength and bending fatigue life. This means that the first plate can reduce the weight of the entire breeding pond while maintaining structural stability, making it easier to install and move. Since PP sheet has multiple excellent properties, the first plate has a wide range of adaptability in the application of film breeding ponds. Whether it is freshwater aquaculture or seawater aquaculture, whether it is a high temperature environment or a low temperature environment, the first plate can play a good role.

[0018] The beneficial effects of the present invention are as follows: the first plate body is spliced ​​to form a closed ring body bracket, which realizes modular design, is easy to assemble, disassemble and expand, and reduces production costs and maintenance difficulty; the design of the second plate body and the reinforcement structure enhances the stability and impact resistance of the breeding pond; the sewage outlet in the middle of the waterproof layer is honeycomb-shaped, which improves the sewage discharge efficiency, and the filter screen arranged inside helps to keep the water clean. The first plate body and the waterproof layer are both made of PP material, which has the characteristics of light weight, high strength, waterproof and wear-resistant; the flange edge design at the end of the first plate body enhances the connection strength between adjacent plates, improves the overall stability, and is easy to disassemble and replace; the waterproof layer is fixedly connected to the edge of the closed ring first plate body bracket, which further enhances the structural stability and effectively prevents water loss and stain accumulation; the close connection between the injection molded plate and the first plate body improves the sealing performance of the structure and protects the internal environment safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the main structural diagrams of the utility model;

[0020] Figure 2 This is a schematic diagram of the flange structure of the present utility model;

[0021] Figure 3 This is a schematic diagram of the main body decomposition structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the reinforcing rib structure of the present utility model;

[0023] Figure 5 This is a schematic diagram of the second plate of the present invention;

[0024] Figure 6 This is the second schematic diagram of the main structure of the utility model.

[0025] Reference numerals include:

[0026] 1. First plate; 2. Waterproof layer; 4. Second plate; 6. Sewage outlet; 7. Flange edge; 8. Mounting hole; 9. Third plate; 11. Reinforcement ribs. DETAILED DESCRIPTION

[0027] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0028] See also Figures 1 to 6 As shown, a film-sticking culture pond of the present invention comprises a plurality of first plates 1 and a waterproof layer 2. The plurality of first plates 1 are spliced ​​end to end to form a closed ring bracket, so that the bracket has a high degree of flexibility and adjustability to meet the needs of different sizes and shapes. The waterproof layer 2 is used to be attached to the inner wall of the first plate 1 and the bottom surrounded by the closed ring bracket. A second plate 4 is provided at the bottom of the first plate 1. The second plates 4 of the plurality of first plates 1 are surrounded to form a ring structure, which improves the stability and impact resistance of the culture pond. The waterproof layer 2 comprises a first waterproof layer arranged on the ring bracket and a second waterproof layer arranged on the ring structure. Two waterproof layers, a ring structure is used to attach the first waterproof layer and the second waterproof layer to each other, and multiple first plates 1 are spliced ​​to form a closed ring bracket. The modular design makes the breeding pond easy to assemble, disassemble and expand, reducing production costs and maintenance difficulties. The waterproof layer 2 is used to attach to the inner wall of the first plate 1 to effectively prevent water from penetrating the first plate 1. A second plate 4 is provided at the bottom of the first plate 1, and multiple second plates 4 are surrounded to form a ring structure. The ring structure formed by the second plate can provide a continuous and tight boundary, effectively isolating the penetration of water, and the sealing performance of the waterproof layer ensures that moisture is effectively blocked.

[0029] Specifically, a plurality of reinforcing ribs 11 are provided on the first plate body 1, and the plurality of reinforcing ribs 11 are distributed on the first plate body 1 in parallel or crosswise manner. In this embodiment, the plurality of reinforcing ribs 11 are distributed on the first plate body 1 in a parallel array structure. The reinforcing ribs 11 can effectively improve the bending and compression resistance of the first plate body 1, and ensure the stability of the breeding pond under severe weather or impact of the cultured animals.

[0030] Specifically, the spacing between adjacent reinforcing ribs 11 gradually increases from the second plate 4 toward the direction away from the second plate 4, resulting in a more uniform stress distribution when the entire structure is subjected to external loads. In areas close to the second plate 4, the density of reinforcing ribs 11 is higher, which can more effectively withstand and distribute the stress from the second plate 4 and the surrounding area. In areas farther from the second plate 4, where stress is relatively low, the spacing between reinforcing ribs 11 can be appropriately increased to save material and maintain the overall stability of the structure.

[0031] Specifically, a third plate body 9 is further provided on the second plate body 4. The third plate body 9 is used to cooperate with the second plate body 4 to clamp the waterproof layer 2. The third plate body 9 and the second plate body 4 jointly clamp the waterproof layer 2, which can form a tighter and more stable clamping of the first waterproof layer and the second waterproof layer, which helps to reduce the gap between the waterproof layer 2 and the second plate body 4, thereby improving the overall sealing performance, effectively preventing moisture penetration and fixing the waterproof layer so that wrinkles will not be generated due to the impact of water flow, reducing stains caused by wrinkles.

[0032] Specifically, the second plate body 4 is provided with a mounting hole 8 for embedding and fixing the waterproof layer 2. The mounting hole 8 is used to cooperate with external bolts to limit the third plate body 9 on the second plate body 4. The second plate body 4 reduces the overall wrinkles, reducing the stains hidden by the wrinkles, which is more conducive to cleaning and makes the overall cleaning effect better.

[0033] Specifically, the second waterproof layer is provided with a sewage outlet 6 and a filter located at the sewage outlet 6. The sewage outlet 6 is located at the center of the second waterproof layer. The sewage outlet 6 has multiple holes, which provide a large surface area and multiple channels. This helps to more evenly distribute the sewage flow, reduce blockage during the sewage discharge process, and thus improve sewage discharge efficiency. The sewage outlet 6 is internally provided with a filter. The filter helps to maintain the clean and stable water quality in the aquaculture pond, providing a good growth environment for the aquaculture.

[0034] Specifically, the ends of the first plates 1 are provided with outwardly folded flanges 7. Two adjacent first plates 1 are positioned relative to each other via the flanges 7, making the overall structure more stable and capable of withstanding greater external forces, such as pressure and tension, thereby improving the overall stability of the structure. When subjected to external forces, the flanges 7 can effectively disperse stress and avoid localized damage caused by stress concentration. This helps extend the service life of the first plates 1 and reduce maintenance costs due to structural damage. The flange 7 connection method allows the first plates 1 to be easily disassembled and replaced when needed. This facilitates the rapid replacement of damaged first plates 1 during equipment or structural upgrades and repairs, reducing time and improving utilization.

[0035] Specifically, the adjacent flange edges 7 on the two first plate bodies 1 are fixed by bolts, and the two flange edges 7 are tightly fitted together by bolts to form a firm connection. This connection method can withstand greater tension and pressure to ensure structural stability. When the first plate body 1 needs to be disassembled or replaced, it can be easily separated by loosening the bolts, which is convenient for maintenance and inspection.

[0036] Specifically, the dimension of the first waterproof layer in the width direction is not less than the dimension of the first plate body 1 in the width direction. The width of the first waterproof layer on the first plate body 1 is greater than the first plate body 1, so that the excess first waterproof layer can be attached to the second plate body 4 and limited by the third plate body 9 to effectively reduce wrinkles caused by water impact.

[0037] Specifically, the first plate 1 is integrally injection molded. The inner wall of the first plate 1 is a smooth surface that facilitates the attachment of the first waterproof layer, and the outer wall of the first plate 1 has reinforcing ribs for enhanced strength. This integral injection molding reduces gaps at the joints, thereby improving the sealing performance of the entire structure, effectively isolating the intrusion of moisture and other harmful substances, and protecting the internal and structural safety. The reinforcing ribs provided on the outer wall of the first plate 1, in conjunction with the reinforcing ribs 11, increase the strength of the outer wall and ensure overall stability.

[0038] Specifically, the waterproof layer 2 includes PP plastic that is resistant to seawater corrosion. The PP plastic layer is attached to the ring bracket and the ring structure via an adhesive layer. The adhesive layer and the release film used to cover the adhesive layer are provided on the PP plastic layer. The waterproof layer 2 is adhered to the plate body via an adhesive layer. The adhesive layer can be tightly adhered between the waterproof layer 2 and the plate body to form a continuous waterproof barrier. This tight combination reduces the possibility of water penetration and improves the overall waterproof performance. An adhesive layer is also provided on the side of the adhesive layer away from the waterproof layer 2. During the handling and installation process, the adhesive layer may be subject to friction and scratching. The adhesive layer can provide a protective barrier to cover the release film of the adhesive layer.

[0039] Specifically, the first plate 1 and the second plate 4 are integrally formed, with the second plate 4 being bent from the bottom of the first plate 1. This integral structure reduces the risk of structural failure due to loose or damaged connectors. Bent joints typically have greater strength, can withstand greater forces, exhibit greater stability when resisting external forces, and are less susceptible to deformation or damage.

[0040] Specifically, the edge of one end of the first waterproof layer is flush with the upper end of the closed ring bracket, and the edge of the other end of the first waterproof layer is flush with the bottom of the closed ring bracket, which is beneficial to prevent the wallpaper from falling off and preventing water loss. The waterproof layer 2 is a wallpaper made of PP material, and PP wallpaper has excellent waterproof performance. When used as the waterproof layer 2, it can effectively prevent water penetration and protect the lower structure from water erosion. The PP wallpaper has a high density and mechanical strength, and excellent scratch resistance and wear resistance. It can resist scratches and wear in daily use and maintain the integrity and aesthetics of the waterproof layer 2. The surface of the PP wallpaper is smooth, not easy to be stained, and easy to clean and maintain. Stains can be easily removed with a wet cloth or detergent to keep the waterproof layer 2 clean and hygienic.

[0041] Specifically, PP, or polypropylene, is a non-toxic, odorless, and tasteless milky white, highly crystalline polymer. It has the following characteristics and applications: Chemical Stability: PP exhibits excellent chemical stability, remaining stable in a variety of chemical environments and exhibiting excellent corrosion resistance to most acids, alkalis, and salts. Physical Properties: It exhibits high strength, impact resistance, and abrasion resistance, making it suitable for tableware, containers, pipes, and more. Environmental Protection: The production process produces no harmful substances and is recyclable, helping to reduce environmental pollution and conserve resources. Applications: PP is widely used in a variety of fields, including household, industrial, agricultural, and medical applications, such as tableware, storage boxes, food containers, water pipes, and gas pipelines. Heat Resistance: PP exhibits excellent heat resistance and can be sterilized at high temperatures. Its higher melting point than other similar materials makes it suitable for manufacturing packaging containers and bags. Formability: PP exhibits excellent formability, but due to its high shrinkage, thick-walled products are prone to denting, making it difficult to achieve the required dimensional accuracy for parts. The finished product has a high surface gloss.

[0042] Specifically, the first plate body 1 is made of PP sheet or engineering plastic. PP sheet is a lightweight material and has high mechanical strength and bending strength. This means that while the first plate body 1 maintains structural stability, the lighter PP sheet can reduce the weight of the entire breeding pond and facilitate installation and movement. Since PP sheet has multiple excellent properties and good acid and alkali resistance, the application of the first plate body 1 in the film breeding pond has wide adaptability. Whether it is freshwater aquaculture or seawater aquaculture, whether it is a high temperature environment or a low temperature environment, the first plate body 1 can play a good role.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A film-attached aquaculture pond, comprising a plurality of first plates (1) and a water-blocking layer (2), wherein the plurality of first plates (1) are spliced ​​end to end to form a closed ring support, and the water-blocking layer (2) is attached to the inner wall of the first plates (1); characterized in that: A second plate body (4) is arranged at the bottom of the first plate body (1); the second plate bodies (4) of a plurality of first plate bodies (1) are arranged to form a ring structure; and the waterproof layer (2) comprises a first waterproof layer arranged on the ring support and a second waterproof layer arranged on the ring structure.

2. A film-attached aquaculture pond according to claim 1, characterized in that: A plurality of reinforcing ribs (11) are provided on the first plate body (1), and the plurality of reinforcing ribs (11) are distributed on the first plate body (1) in parallel or crosswise manner.

3. A film-attached aquaculture pond according to claim 2, characterized in that: The distance between two adjacent reinforcing ribs (11) gradually increases from the second plate body (4) in a direction away from the second plate body (4).

4. The film-attached aquaculture pond according to claim 1, characterized in that: A third plate body (9) is also provided on the second plate body (4), and the third plate body (9) is used to cooperate with the second plate body (4) to clamp the first waterproof layer or the second waterproof layer.

5. The film-attached aquaculture pond according to claim 4, characterized in that: The second plate body (4) is provided with a mounting hole (8), and the mounting hole (8) is used to cooperate with external bolts to limit the third plate body (9) on the second plate body (4).

6. The film-attached aquaculture pond according to claim 1, characterized in that: The second waterproof layer is provided with a sewage outlet (6) and a filter screen located at the sewage outlet (6), and the sewage outlet (6) is located at the center of the second waterproof layer.

7. The film-attached aquaculture pond according to claim 1, characterized in that: An outwardly folded flange (7) is provided at the end of the first plate body (1), and two adjacent first plate bodies (1) are connected in a limiting manner via the flange edge (7).

8. The film-attached aquaculture pond according to claim 1, characterized in that: The first plate body (1) is integrally injection molded, the inner wall of the first plate body (1) is a smooth surface for accommodating the first waterproof layer, and the outer wall of the first plate body (1) has reinforcing ribs for increasing strength.

9. The film-attached aquaculture pond according to claim 1, characterized in that: The water-proof layer (2) comprises a PP plastic layer resistant to seawater corrosion, an adhesive layer arranged on the PP plastic layer, and a release film for covering the adhesive layer. The PP plastic layer is attached to the ring support and the ring structure via the adhesive layer.

10. The film-attached aquaculture pond according to claim 1, characterized in that: The first plate body (1) and the second plate body (4) are an integrated structure, and the second plate body (4) is bent from the bottom of the first plate body (1).