An assembled cement-based thin-walled structure box and its construction method

Abstract

The present invention discloses an assembled, cement-based, thin-walled cage and its construction method. The cage comprises a float, a net, and a support structure. The float is a hollow structure made of a laminated cement substrate. The laminated cement substrate comprises cement mortar and a three-dimensional synthetic fiber mesh A and a metal mesh B pre-placed within a mold. The three-dimensional synthetic fiber mesh A is positioned as a single layer on the outer side of the laminated cement thin wall, while the metal mesh B is positioned as multiple layers on the inner side of the laminated cement thin wall. During the molding process, the cement mortar fills the mold and is composited with the three-dimensional synthetic fiber mesh A to form a protective layer. The support structure is located at the bottom of the float, and the net is secured to the support structure. The net is capable of maintaining a stable aquaculture area under ocean currents, ensuring that the cage maintains sufficient aquaculture water even in strong currents. The present invention exhibits excellent durability in marine environments and aquaculture water stability.

Description

Technical Field

[0001] The present invention relates to the technical field of marine aquaculture, and in particular to an assembled cement-based thin-walled structure cage and a construction method thereof. Background Art

[0002] Currently, gravity-fed high-density polyethylene (HDPE) cages are widely used in marine ranching in my country. These cages are flexible, easy to install, economical, heat-resistant, cold-resistant, flexible, and wear-resistant. The float of the cage is the main structural component, providing buoyancy for the entire cage. The aquaculture water is surrounded by the netting and ballast beneath the HDPE float, which is gravity-controlled. However, in environments with high currents, these cages have a weak ability to resist deformation. When exposed to the current, the netting is prone to tilting, curling, and wrinkling. This reduces the aquaculture water volume, restricts the space for aquatic organisms, increases crowding and collisions among marine organisms, and ultimately reduces aquaculture yields.

[0003] In recent years, cement-based materials have been gradually adopted for the construction of aquaculture cages due to their low cost and excellent durability. However, cement-based cages have not yet been widely used. The main reasons are: ordinary reinforced concrete or FRP-reinforced concrete cages are bulky, making them difficult to operate in aquaculture, such as towing and lifting. Furthermore, cages constructed with ultra-high performance concrete (UHPC) often suffer from rusting of exposed fiber tips due to the use of chopped steel fibers. Furthermore, the steel fibers within UHPC easily form a connected network. Therefore, cement-based cages using chopped steel fibers also face durability risks due to electrochemical corrosion.

[0004] In order to make full use of the rich high-velocity sea aquaculture resources in my country's coastal areas, and at the same time, better solve the problems of bulky cement-based material cage structures and surface corrosion, it is urgent to develop thin-walled, lightweight cement-based material cages that are suitable for high-velocity sea environments and have excellent durability in marine environments. Summary of the Invention

[0005] In response to the above-mentioned prior art, the present invention provides an assembled cement-based thin-walled structure cage and a construction method thereof, which has excellent durability in marine environment and stability of aquaculture water.

[0006] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows:

[0007] A prefabricated cement-based thin-walled structure cage comprises a float, a mesh and a support structure. The float is a hollow structure made of a laminated cement substrate, the laminated cement substrate comprising cement mortar and a three-dimensional fiber mesh A and a metal mesh B cast within the cement mortar. The three-dimensional fiber mesh A is located on the outer side of the laminated cement substrate, and the metal mesh B is located on the inner side of the laminated cement substrate. During the molding process, the cement mortar fills the mold and is composited with the three-dimensional fiber mesh A to form a protective layer for the metal mesh B. The support structure is arranged at the bottom of the float, and the mesh is fixed to the support structure and can maintain a stable aquaculture area under ocean currents.

[0008] Furthermore, the three-dimensional fiber mesh A is a three-dimensional synthetic fiber fabric mesh, and the metal mesh B includes at least a first metal mesh and a second metal mesh, and the mesh number of the first metal mesh is smaller than the mesh number of the second metal mesh.

[0009] Furthermore, the laminated cement substrate also includes a three-dimensional fiber mesh C, which is a three-dimensional synthetic fiber fabric mesh. The three-dimensional fiber mesh C is attached to the inner surface of the hollow structure made of the laminated cement substrate, and the three-dimensional fiber mesh C is impregnated with a waterproof material, which is polyurea.

[0010] Furthermore, the inner cavity of the floating body is provided with reinforcing ribs, and the reinforcing ribs include a metal mesh D located inside the metal mesh B and steel bars, and the steel bars are located between the metal mesh B and the metal mesh D.

[0011] Furthermore, the support structure includes a support frame fixed below the floating body, the net is fixed on the support frame, the support frame is made of glass fiber reinforced plastic or carbon fiber reinforced plastic, and the net encloses a breeding area.

[0012] Furthermore, the support frame includes a support rod and a counterweight block, the upper end of the support rod is inserted into the hole reserved at the bottom edge of the float and is fixed, and the lower end of the support rod is provided with the counterweight block; the bottoms of the support rods are connected to each other through transverse connecting rods, and the connecting rods are connecting rods made of glass fiber reinforced plastic or carbon fiber reinforced plastic; the net surrounds the support frame therein; the float and / or support structure is provided with an anchoring rope, and the anchoring rope is connected to a fixed anchor.

[0013] Furthermore, the floating body is composed of a plurality of prefabricated cylinders made of laminated cement substrate, both ends of the prefabricated cylinders are open, the tops of two adjacent prefabricated cylinders are connected to each other by a bent first prefabricated plate, the bottom of the floating body is provided with a prefabricated ring beam, the prefabricated ring beam is connected to the prefabricated cylinder, the bottoms of two adjacent prefabricated cylinders are connected to each other by a bent second prefabricated plate, the second prefabricated plate is connected to the prefabricated ring beam, and the first prefabricated plate and the second prefabricated plate cover the joints of the two adjacent prefabricated cylinders.

[0014] A method for constructing an assembled cement-based thin-walled structure box comprises the following steps:

[0015] S1. Fix the three-dimensional fiber mesh A and the metal mesh B into a fiber mesh cage using plastic cards according to a preset order and interval, and then fill the fiber mesh cage into a mold;

[0016] S2. Pour the prepared cement mortar into the mold and vibrate it to fill and penetrate the gap between the mold and the fiber mesh cage to form a prefabricated cylinder;

[0017] S3, sealing both ends of the prefabricated cylinder and connecting the ends of the prefabricated cylinder one by one to form a closed quadrilateral or polygonal floating body composed of multiple compartments;

[0018] S4. Install the support structure and the net below the floating body.

[0019] Furthermore, in the S2 step, the ends of the steel bars extending from the ends of adjacent prefabricated cylinders are overlapped with each other, and the ends of the overlapping steel bars are welded, and finally covered with cement mortar in a wet connection manner; the tops of the two adjacent prefabricated cylinders are connected using a bent first prefabricated plate, and the bottoms of the two adjacent prefabricated cylinders are connected using a bent second prefabricated plate.

[0020] Furthermore, in the step S2, after the prefabricated cylinder is formed, the three-dimensional fiber mesh C impregnated with polyurea waterproof coating is pasted on the inner surface of the cavity of the prefabricated cylinder, smoothed and dried, and then the prefabricated cylinders are spliced ​​to form the floating body.

[0021] The beneficial effects of the present invention are:

[0022] (1) During the cement mortar molding process, a "micro-protective layer" is formed at the location of the three-dimensional fiber mesh A, which can prevent chloride ions in seawater from diffusing and penetrating into the interior of the thin-walled structure, protect the steel fiber mesh and steel bars inside the structure, control the formation of surface micro-cracks, and prevent the exposure of the steel fiber mesh. This structure has better durability in the marine environment than the existing high-density polyethylene material.

[0023] (2) Metal mesh with variable mesh size is used for stacking reinforcement to obtain a high-strength and high-toughness cement-based thin-walled floating body, which has the characteristics of matching the structural force with the distribution of the reinforcement body and higher reinforcement efficiency. Therefore, it has greater advantages in mechanical properties than the existing high-density polyethylene structure.

[0024] (3) The present invention provides a novel structural support system for a fish cage made of glass fiber reinforced plastic or carbon fiber reinforced plastic that combines both rigidity and flexibility. This system provides both support and cushioning, enabling the fish cage to maintain the necessary aquaculture water in high-velocity waters and carry out normal marine aquaculture. The buoyancy generated by the float of the present invention is sufficient to bear the weight of the components and the load of temporary loads such as operators, fish feed, and maintenance items. It can also provide buoyancy reserves for leisure activities such as fishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of an assembled cement-based thin-walled structure cage in an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the floating body in the embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of the partial structure of the floating body in the embodiment of the present application;

[0028] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0029] Description of Figure Numbers:

[0030] 1. Floating body; 3. Three-dimensional fiber mesh A; 4. Metal mesh B; 5. First metal mesh; 6. Second metal mesh; 7. Three-dimensional fiber mesh C; 8. Waterproof material; 9. Metal mesh D; 10. Steel bars; 12. Netting; 13. Support rods; 14. Counterweights; 15. Connecting rods; 16. Anchor ropes; 17. Fixed anchors; 18. Prefabricated cylinder; 19. First prefabricated panel; 20. Prefabricated ring beam; 21. Second prefabricated panel; 22. Reinforcing ribs. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further elaborated in detail below in conjunction with the drawings and specific embodiments of the specification. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In the following description, reference is made to "some embodiments", which describes a subset of all possible embodiments, but it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0032] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Please refer to the attached Figures 1 to 4 The present application provides an assembled cement-based thin-walled structure cage, comprising a float 1, a mesh 12 and a support structure, wherein the float 1 is a hollow structure made of a laminated cement substrate, the laminated cement substrate comprising cement mortar and a three-dimensional fiber mesh A3 and a metal mesh B4 cast inside the cement mortar, the three-dimensional fiber mesh A3 being located in the form of a single layer on the outer side of the laminated cement substrate, the metal mesh B4 being located on the inner side of the laminated cement substrate, a protective layer being formed at the location of the three-dimensional fiber mesh A3 during the molding process of the cement mortar, the mold being filled with the cement mortar during the molding process and being composited with the three-dimensional fiber mesh A3 to form a protective layer for the metal mesh B, the support structure being arranged at the bottom of the float 1, the mesh being fixed on the support structure, and being capable of maintaining a stable aquaculture area under ocean currents.

[0034] The float 1 is a hollow structure made of a laminated cement substrate, with an overall U-shaped structure. The four walls of the float 1 are thin, approximately 5-8 cm thick. The laminated cement substrate comprises cement mortar and a three-dimensional fiber mesh A3 and a metal mesh B4 cast within the cement mortar. The three-dimensional fiber mesh A3 is located on the outer side of the laminated cement substrate, while the metal mesh B4 is located on the inner side of the laminated cement substrate. During the cement mortar molding process, a "micro-protective layer" is formed at the location of the three-dimensional fiber mesh A3. This layer prevents chloride ions in seawater from diffusing and penetrating into the thin-walled structure, controls the formation of surface microcracks, and prevents the exposure of the steel fiber mesh.

[0035] Preferably, the metal mesh B4 can be made of steel wire mesh or steel fiber mesh. Multiple layers of metal mesh B4 can be arranged within the thin wall. The spacing between the multiple layers of metal mesh B4 can be adjusted based on the stress conditions of the thin wall and secured with plastic clips. Where the support structure and the inner surface of the thin wall of the floating body 1 are subject to greater bidirectional tension, a denser arrangement of laminated steel mesh is used. In the middle of the thin wall thickness, i.e., near the neutral plane, fewer steel meshes are used. This facilitates the subsequent pouring and molding of the high-strength mortar mixture.

[0036] Synthetic fiber mesh fabric and steel wire mesh can be formed by stacking, separating, and fixing, which can not only improve the fiber reinforcement efficiency, but also provide a protective layer for the steel wire mesh to prevent the exposure of the steel fibers. This high-strength and high-toughness cement-based material thin-walled float 1 can reduce the structural weight while improving durability. The present invention not only provides a new type of cage structure system that is both rigid and flexible, making it suitable for normal marine aquaculture in high-velocity waters; it also uses new micro-structural reinforcement technology to manufacture a strong and ultra-thin float 1 to improve the load-bearing capacity and structural durability of the float 1. The buoyancy generated by the float 1 of the present invention is sufficient to bear the weight of each component and the load of temporary loads such as operating personnel and fish feed, maintenance items, etc., and can also provide buoyancy reserves for leisure activities such as fishing.

[0037] This is fundamentally different from existing methods that simply insert rebar or steel mesh into a cement matrix. While existing methods simply reinforce components with rebar, the cement matrix remains brittle. While its overall bearing capacity may improve over time, it can be susceptible to localized cracking under the influence of ocean winds, waves, and currents, leading to corrosion of the internal rebar and subsequent structural damage. The metal mesh B4 of the present invention alters both the microstructure and material properties. The use of other fiber meshes also has specific implications and intended functions, specifically improving the flexibility of the cement matrix, thereby significantly enhancing impact resistance.

[0038] Near the surface of the laminated cement-based component, the present invention utilizes a three-dimensional fabric layered with steel mesh, then filled with cement slurry to form a dense "micro-protective layer." This micro-protective layer isolates and protects the steel mesh or steel fibers, enhancing the durability of marine components and providing excellent resistance to seepage, cracking, and corrosion. This represents a significant innovation in the field of ultra-high-performance cement-based material systems for marine engineering, enhancing structural durability. While traditional protective layers, typically several centimeters thick, are designed for steel reinforcement, the micro-protective layer is only a few millimeters thick, achieving a truly thin-walled effect.

[0039] The grid sheets of this invention do not follow a fixed, equidistant arrangement pattern, but are flexibly configured based on specific stress distribution and marine protection requirements. This design approach aims to achieve a more scientific and rational structural layout, improve the fiber reinforcement efficiency, and meet the performance requirements of different application scenarios.

[0040] Specifically, the three-dimensional fiber mesh A3 is a three-dimensional synthetic fiber fabric mesh, and the metal mesh B4 includes at least a first metal mesh 5 and a second metal mesh 6, wherein the mesh number of the first metal mesh 5 is smaller than the mesh number of the second metal mesh 6. Preferably, the metal mesh B4 comprises several layers of metal meshes, which are, from the inside to the outside, the first metal mesh B1, the second metal mesh B2, the third metal mesh B3, ..., the Nth metal mesh B n ,Nth metal mesh B n The mesh number is smaller than that of the N+1 metal mesh B n+1 The mesh number.

[0041] The "synthetic fiber mesh + dense steel wire mesh + sparse steel wire mesh" laminated structure, which is parallel to the surface inside the side wall, is located in the outermost layer of the cement thin wall. The thin surface layer formed by the synthetic fiber mesh and the cement mortar is equivalent to the "micro-protective layer" of the steel mesh inside the thin-wall structure. It can prevent chloride ions in seawater from diffusing and penetrating into the interior of the thin-wall structure, control the formation of surface microcracks, and prevent the steel fiber mesh from being exposed. The water-facing surface of the side wall of the float 1 is susceptible to the pressure and impact of seawater. In the present invention, the back side of the water-facing surface of the float 1 is subjected to tensile stress, that is, the inner surface is subjected to tensile stress. The present invention can effectively resist stress damage borne by the center position of this surface.

[0042] Specifically, the laminated cement substrate also includes a three-dimensional fiber mesh C7, which is a three-dimensional synthetic fiber fabric mesh. This mesh is located on the inner surface of the hollow structure formed by the laminated cement substrate and is coated with a waterproof material 8, which is polyurea. A 2-5 mm thick layer of the three-dimensional fiber mesh C7 can be adhered to the inside, or secured by other means. The polyurea waterproof coating can then be applied to the mesh, allowing the coating to completely penetrate the interior of the mesh, thereby forming a thick waterproof layer with excellent adhesion and deformation capabilities.

[0043] Specifically, the inner cavity of the float 1 is provided with reinforcing ribs 22, and the reinforcing ribs 22 include a metal mesh D9 located inside the metal mesh B4 and steel bars 10, and the steel bars 10 are located between the metal mesh D9 and the metal mesh B4. A plurality of vertical reinforcing ribs 22 are added to the inner wall of the float 1, and steel bars 10 are arranged in the reinforcing ribs 22; near the inner surface of the thin wall, multiple layers of laminated metal mesh D9 with smaller spacing are arranged to resist horizontal tensile stress; near the "neutral plane" of the thin wall, the tensile stress is smaller, so the spacing of the configured steel wire mesh is larger, so that high-strength and high-fluidity cement mortar can be poured in through the gap near the "neutral plane" and fill the internal gaps. Preferably, the metal mesh D9 is a plurality of layers, for example, including a first metal mesh D1, a second metal mesh D2, a third metal mesh D3...the Nth metal mesh D n A single layer of three-dimensional fiber mesh A, several layers of metal mesh B, steel bars and several layers of metal mesh D are formed on the side wall of the reinforcing rib from the outside to the inside.

[0044] Specifically, the support structure includes a support frame fixed below the buoy 1. The net 12 is wrapped around the support frame. The support frame is made of glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). The net 12 encloses a breeding area. Marine life and the like can be cultured in the breeding area.

[0045] Specifically, the support structure includes a support rod 13 and a counterweight 14. The upper end of the support rod 13 is connected to the bottom of the buoy 1, and the counterweight 14 is provided at the lower end of the support rod 13. The net 12 is connected to the support rod 13. The support rod 13 is made of fiber-reinforced plastic (FRP) and is cylindrical or cylindrical in shape, with a cross-sectional diameter generally not exceeding 5 cm. The upper half of the rod, within approximately 1 meter, is a variable diameter rod with a diameter range of approximately 1 cm. The rod thickness corresponds to the size of the reserved holes at the edge of the buoy and the edge of the bottom plate ring beam. The rod is fixed to the buoy structure in a wedge-shaped interlocking manner. The counterweight 14 pulls the support frame downward, causing it to expand to form a stable support structure, thereby securing the net 12 and forming a stable aquaculture area. The support system constructed by FRP support rods 13 introduced in the present invention cleverly combines the dual characteristics of rigidity and flexibility. Especially in high-velocity sea areas, it shows the unique advantage of "buffering" against the impact of ocean currents, greatly improving the stability of the aquaculture cages.

[0046] Specifically, the support structure also includes a connecting rod 15. The bottoms of the support rods 13 are interconnected by a transverse connecting rod 15, and the connecting rods are made of glass fiber reinforced plastic or carbon fiber reinforced plastic. The vertical support rods 13 made of FRP material and the transverse connecting rods 15 made of FRP material at the bottom of the support structure are connected to each other, together forming a net support system. Compared with a rigid support system, this flexible frame has good structural coordination. When impacted by high-speed ocean currents, it can provide a certain buffering effect while ensuring that the aquaculture water body is not lost, thereby ensuring the stability of the main structure of the pontoon. The float 1 and / or the support structure are provided with an anchor rope 16, and the anchor rope 16 is connected to a fixed anchor 17. The anchor rope 16 and the fixed anchor 17 are used to fix the support structure to prevent it from being carried away by the water flow. The top of the float 1 is provided with a top plate, and the bottom of the float 1 is provided with a bottom plate to improve the strength of the float 1.

[0047] Specifically, the floating body 1 is composed of a plurality of prefabricated cylinders 18 made of laminated cement substrate. Both ends of the prefabricated cylinders 18 are open, and the tops of two adjacent prefabricated cylinders 18 are connected to each other by a bent first prefabricated plate 19. The bottom of the floating body 1 is provided with a prefabricated ring beam 20, which is connected to the prefabricated cylinders 18. The bottoms of the two adjacent prefabricated cylinders 18 are connected to each other by a bent second prefabricated plate 21, which is connected to the prefabricated ring beam 20. The first prefabricated plate 19 and the second prefabricated plate 21 cover the joint between the two adjacent prefabricated cylinders 18. The prefabricated cylinders 18, the first prefabricated plate 19, and the second prefabricated plate 21 can all be prefabricated in a factory. After all the prefabricated components are prepared, they are assembled and connected at the assembly station. The assembly station can be selected to be carried out on a workbench, and the clearance height of the table should be above 1.5m. If assembly and connection are performed in a dry dock, water can be released into the dry dock to float the structure. If assembly and connection are performed at seaside, an airbag roller is required to assist in launching the structure into the water. The assembly and connection process follows a bottom-up, step-by-step approach. Component connections are completed through welding of pre-embedded steel bars, wrapping with fiber-cement mortar, and applying waterproof adhesive to the joints. After assembly, cement-based prefabricated components must be left to stand for at least seven days, and the airtightness of the cavity must be verified.

[0048] A method for constructing an assembled cement-based thin-walled structure box comprises the following steps:

[0049] S1, fix the three-dimensional fiber mesh A3 and the metal mesh B4 into a fiber mesh cage with plastic cards according to the preset order and interval, and then fill the fiber mesh cage into the mold; when the metal mesh B4 is multi-layered, for example, including the first metal mesh B1, the second metal mesh B2, the third metal mesh B3... the Nth metal mesh B n, then the first metal mesh B1, the second metal mesh B2, the third metal mesh B3...the Nth metal mesh B n , fixed in sequence.

[0050] S2. Pour the prepared cement mortar into the mold while vibrating it slightly. During the pouring process, the mortar is vibrated slightly to expel air bubbles from the mortar. The cement mortar fills and penetrates the gaps between the mold and the fiber mesh cage to form a prefabricated cylinder 18. The prefabricated cylinders 18 are then spliced ​​together to form the float 1. High-strength, high-fluidity cement mortar is poured into the mold. The mortar flows through the gaps at the "neutral plane," diffuses to both sides, and penetrates into the gaps in the outermost three-dimensional fabric. The two combine to form a dense bonding layer, or "micro-protective layer." The mesh panels in the middle are spaced farther apart, allowing the cement mortar to easily enter the mesh cage through the larger gaps and penetrate into the gaps between the mold and the fiber mesh. After the cement mortar hardens, it undergoes the demolding and curing process.

[0051] S3. Seal both ends of the prefabricated cylinder 18 and connect the ends of the prefabricated cylinder 18 one by one to form a closed quadrilateral or polygonal floating body composed of multiple compartments.

[0052] S4. Install the net and supporting structure below the floating body 1 to form an integral net cage structure.

[0053] Specifically, in step S2, the ends of the steel bars 10 extending from the ends of adjacent prefabricated cylinders 18 are overlapped with each other, and the ends of the overlapped steel bars 10 are welded, and finally covered with cement mortar in a wet connection manner; the tops of the two adjacent prefabricated cylinders 18 are connected by using a bent first prefabricated plate 19, and the bottoms of the two adjacent prefabricated cylinders 18 are connected by using a bent second prefabricated plate 21, which not only has the function of connecting the floating body 1, but also has the function of improving the load-bearing capacity of the bottom plate.

[0054] Specifically, in step S2, after the prefabricated cylinder 18 is formed, a three-dimensional fiber mesh C7 impregnated with a polyurea waterproof coating is attached to the inner surface of the cavity of the prefabricated cylinder 18, smoothed and air-dried, and then the prefabricated cylinders 18 are spliced ​​together to form the floating body. The polyurea waterproof coating is then applied to the prefabricated cylinder 18, allowing the coating to completely penetrate the interior of the three-dimensional fiber mesh C7, thereby forming a waterproof layer of a certain thickness with excellent bonding strength and deformation capacity.

[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. The scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An assembled cement-based thin-walled structure cage, characterized in that: The invention comprises a float, a mesh and a support structure, wherein the float is a hollow structure made of a laminated cement substrate, the laminated cement substrate comprises cement mortar and a three-dimensional fiber mesh A and a metal mesh B cast inside the cement mortar, the three-dimensional fiber mesh A is located on the outer side of the laminated cement substrate, and the metal mesh B is located on the inner side of the laminated cement substrate; during the molding process, the cement mortar fills the mold and is composited with the three-dimensional fiber mesh A, thereby becoming a protective layer for the metal mesh B; the support structure is arranged at the bottom of the float, and the mesh is provided on the bottom of the float. It is fixed on the supporting structure and can maintain a stable aquaculture area under the ocean current; the floating body is composed of a plurality of prefabricated cylinders made of laminated cement substrate, both ends of the prefabricated cylinders are open, and the tops of two adjacent prefabricated cylinders are connected to each other by a bent first prefabricated plate, and the bottom of the floating body is provided with a prefabricated ring beam, which is connected to the prefabricated cylinder, and the bottoms of two adjacent prefabricated cylinders are connected to each other by a bent second prefabricated plate, which is connected to the prefabricated ring beam, and the first prefabricated plate and the second prefabricated plate cover the joints of the two adjacent prefabricated cylinders.

2. The assembled cement-based thin-walled structure cage according to claim 1, characterized in that: The three-dimensional fiber mesh A is a three-dimensional synthetic fiber fabric mesh, and the metal mesh B includes at least a first metal mesh and a second metal mesh, and the mesh number of the first metal mesh is smaller than the mesh number of the second metal mesh.

3. The assembled cement-based thin-walled structure cage according to claim 1, characterized in that: The laminated cement substrate also includes a three-dimensional fiber mesh C, which is a three-dimensional synthetic fiber fabric grid sheet. The three-dimensional fiber mesh C is attached to the inner surface of the hollow structure made of the laminated cement substrate. The three-dimensional fiber mesh C is dipped in a waterproof material, which is polyurea.

4. The assembled cement-based thin-walled structure cage according to claim 1, characterized in that: The inner cavity of the floating body is provided with reinforcing ribs, and the reinforcing ribs include a metal mesh D located inside the metal mesh B and steel bars, and the steel bars are located between the metal mesh B and the metal mesh D.

5. The assembled cement-based thin-walled structure cage according to claim 1, characterized in that: The supporting structure comprises a supporting frame fixed below the floating body, the net is fixed on the supporting frame, the supporting frame is made of glass fiber reinforced plastic or carbon fiber reinforced plastic, and the net encloses a breeding area.

6. The assembled cement-based thin-walled structure cage according to claim 5, characterized in that: The support frame includes a support rod and a counterweight block, the upper end of the support rod is inserted into the hole reserved at the bottom edge of the floating body and is fixed, and the lower end of the support rod is provided with the counterweight block; the bottoms of the support rods are connected to each other by transverse connecting rods, and the connecting rods are connecting rods made of glass fiber reinforced plastic or carbon fiber reinforced plastic; the net surrounds the support frame therein; the floating body and / or supporting structure is provided with an anchoring rope, and the anchoring rope is connected to a fixed anchor.

7. The method for constructing an assembled cement-based thin-walled structure cage according to claim 1, characterized in that: The following steps are involved: S1. Fix the three-dimensional fiber mesh A and the metal mesh B into a fiber mesh cage using plastic cards according to a preset order and interval, and then fill the fiber mesh cage into a mold; S2. Pour the prepared cement mortar into the mold and vibrate it to fill and penetrate the gap between the mold and the fiber mesh cage to form a prefabricated cylinder; S3, sealing both ends of the prefabricated cylinder and connecting the ends of the prefabricated cylinder one by one to form a closed polygonal floating body composed of multiple compartments; S4. Install the support structure and the net below the floating body.

8. The method for constructing an assembled cement-based thin-walled structure cage according to claim 7, characterized in that: In the step S2, the ends of the steel bars extending from the ends of adjacent prefabricated cylinders are overlapped with each other, and the ends of the overlapping steel bars are welded, and finally covered with cement mortar in a wet connection manner; the tops of the two adjacent prefabricated cylinders are connected using a bent first prefabricated plate, and the bottoms of the two adjacent prefabricated cylinders are connected using a bent second prefabricated plate.

9. The method for constructing an assembled cement-based thin-walled structure cage according to claim 7, characterized in that: In the step S2, after the prefabricated cylinder is formed, the three-dimensional fiber mesh C impregnated with polyurea waterproof material is pasted on the inner surface of the cavity of the prefabricated cylinder, smoothed and dried, and then the prefabricated cylinders are spliced ​​to form the floating body.

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