Net cage structure capable of improving fish inhabitation friendliness and installation method thereof

Abstract

The invention relates to the technical field of mariculture equipment, and discloses a net cage structure capable of improving fish inhabitation friendliness and an installation method thereof.The net cage structure comprises jacket supporting legs, wave-proof net supporting legs, an inner-layer culture net, an outer-layer wave-proof net and an anchoring foundation; the jacket supporting legs and the wave-proof net supporting legs are anchored to a seabed foundation bed in pairs through the anchoring foundations, and a polygon is formed by the multiple pairs of jacket supporting legs and wave-proof net supporting legs at anchoring points of the seabed foundation bed. The inner-layer culture net is bound and connected with the jacket supporting legs to form an inner-layer polygonal cylinder; the outer-layer wave-proof net and the wave-proof net supporting legs are bound and connected to form an outer-layer polygonal cylinder; the inner-layer breeding net and the outer-layer wave-proof net are each divided into a pressure relief area, a transition area and an inhabitation area according to the same height interval, so that fish inhabitation friendliness is improved. Through mechanical analysis and cultivation research, the net is vertically divided into a plurality of functional areas based on nonlinear distribution of ocean current energy along the water depth so as to adapt to upper-layer swimming and lower-layer inhabiting of fish schools.

Description

Technical Field

[0001] The invention relates to the technical field of marine aquaculture equipment, and in particular to a cage structure capable of increasing fish habitat friendliness and an installation method thereof. Background Art

[0002] In the field of deep-sea aquaculture, the design of traditional cage structures has long been constrained by the contradiction between two core issues - the difficulty of balancing the optimization of anti-flow load and fish habitat friendliness. This technical dilemma directly affects aquaculture efficiency and ecological sustainability.

[0003] Deep-sea aquaculture cages need to meet two seemingly contradictory physical field requirements at the same time: first, the fluid mechanics field requires the nets to have the characteristics of high strength and low resistance to withstand the impact of strong ocean currents and avoid structural damage; second, the biological habitat field requires the nets to have high permeability and low noise environment to maintain normal feeding and migratory behavior of fish.

[0004] In traditional design, these two requirements are in a trade-off relationship in the selection of net parameters (mesh size, wire diameter). For example, although a small mesh size (≤20mm) can reduce the instantaneous flow velocity, it will significantly increase the water flow resistance (inversely proportional to the mesh area), causing the overall load of the cage to increase exponentially; while a large mesh size (≥50mm) can improve water exchange, it will cause the net to produce a "resonance effect" under the action of waves, accelerating structural fatigue. Summary of the invention

[0005] In order to solve the existing problems, the present invention provides a cage structure that can increase the friendliness of fish habitat. Through the coupling study of fluid mechanics analysis and aquaculture ecological needs, it is found that the energy of ocean currents is distributed nonlinearly along the water depth: the surface velocity is high but the energy decays quickly, and the bottom velocity is low but the long-term effect is significant. Based on this law, the net is vertically divided into three functional areas: the pressure relief area (surface layer) adopts large mesh size and high diameter wire, and discharges quickly to reduce instantaneous impact; the transition area (middle layer) maintains medium parameters to balance load and permeability; the habitat area (bottom layer) adopts small mesh size and low diameter wire to adapt to the natural water flow state and the needs of fish swimming in the upper layer and living in the lower layer.

[0006] In order to achieve the above object, the present invention provides the following technical solutions.

[0007] The present invention provides a cage structure capable of increasing the friendliness of fish habitat, comprising conductor frame legs, wave-breaking net legs, an inner layer aquaculture net, an outer layer wave-breaking net and an anchoring foundation; the conductor frame legs and the wave-breaking net legs are anchored to a seabed in pairs through an anchoring foundation, and a plurality of pairs of conductor frame legs and wave-breaking net legs form a polygon at the anchoring point of the seabed; the inner layer aquaculture net and the conductor frame legs are tied and connected to form an inner layer polygonal column; the outer layer wave-breaking net and the wave-breaking net legs are tied and connected to form an outer layer polygonal column; the inner layer aquaculture net and the outer layer wave-breaking net are divided into a pressure relief zone, a transition zone and a habitat zone according to the same height range to improve the friendliness of fish habitat.

[0008] As a further improvement of the present invention, the wave-breaking net legs are vertically extended into the anchor foundation and fixed, the conductor frame legs are obliquely extended into the anchor foundation and fixed, and the center line angle α between the wave-breaking net legs and the conductor frame legs is 5°~8°; the inner layer of the breeding net and the outer layer of the wave-breaking net are staggered at the bottom of the cage structure to form an enclosure.

[0009] As a further improvement of the present invention, the total length of the wave-breaking net legs is H; the height ranges of the pressure relief zone, transition zone and habitat zone are 0.2H~0.4H, 0.2H~0.4H and 0.3H~0.5H respectively.

[0010] As a further improvement of the present invention, the foot sizes of the pressure relief zone, transition zone and habitat zone range from 44mm to 55mm, 35mm to 45mm and 25mm to 35mm respectively.

[0011] As a further improvement of the present invention, the diameter size ranges of the mesh wires in the pressure relief zone, transition zone and habitat zone are 4.0mm~4.6mm, 3.2mm~4.0mm and 2.5mm~3.2mm respectively.

[0012] As a further improvement of the present invention, the diameter of the wave-breaking net legs is greater than 1 / 5 of the diameter of the anchor foundation, the diameter of the wave-breaking net legs is smaller than the diameter of the conductor frame legs, and the diameter of the conductor frame legs is smaller than 2 / 5 of the diameter of the anchor foundation.

[0013] As a further improvement of the present invention, the inner layer breeding net and the outer layer wave-breaking net of the habitat area are both made of low-resistance coating materials with a surface roughness of less than or equal to 0.05 mm.

[0014] As a further improvement of the present invention, it also includes a tension adjustment device; the connection between the inner layer breeding net and the conductor frame support legs adopts an adjustable tension device to achieve dynamic adjustment of the pre-tensioning force of the net; the connection between the outer layer wave-breaking net and the wave-breaking net support legs adopts an adjustable tension device to achieve dynamic adjustment of the pre-tensioning force of the net.

[0015] As a further improvement of the present invention, the outer layer of the outer wave-breaking net is a double-layer structure, the outer layer is a high-density polyethylene (HDPE) material, and the inner layer is a nylon (PA) material, and the double-layer structure is formed into a composite structure by hot-melt welding; the anchoring foundation adopts a combined structure of a gravity anchor block and a suction anchor.

[0016] The present invention also provides a method for installing a cage structure capable of increasing the friendliness of fish habitat, comprising the following steps: Carry out modular assembly on land, pre-assemble the jacket legs, wave-breaking net legs, pre-partitioned inner aquaculture nets, outer wave-breaking nets and anchor foundation components into transport modules; Use the sonar positioning system to determine the cage installation location in the predetermined deep sea area; use the underwater robot to lift the transport module to the predetermined location; Install the anchor foundation at the preset position around the cage, connect the jacket legs and the wave-breaking net legs, and use the underwater monitoring equipment to adjust the layout of the anchor foundation to ensure that the angle between the jacket legs and the wave-breaking net legs meets the requirements of fluid mechanics optimization; Unfold and install the inner breeding net and outer wave-breaking net in the pressure relief zone, transition zone and habitat zone in sequence. If there is an adjustable tension device, use the tension adjustment structure to preliminarily pre-tighten the net to ensure that the initial tension at the connection between the net and the outrigger meets the design requirements.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Through a system-level design approach, this device organically combines fluid mechanics optimization with ecological habitat needs; by integrating the conductor frame legs, wave-breaking net legs, double-layer nets and anchoring foundations, a modular structure is formed, which significantly improves the overall stability and installation efficiency of the cage; the nets are designed according to functional pre-zoning (pressure relief zone, transition zone, habitat zone), which can optimize the water flow environment in a targeted manner, achieve a balance between the anti-flow load and the habitat needs of fish, and meet the space requirements of fish schools swimming in the upper layer and living in the lower layer, so as to reduce the obstruction of fish schools swimming in the deep-sea environment by the nets and improve the ecological friendliness of aquaculture; at the same time, a habitat area is set at the bottom of the cage, which can save the cost of building bionic fish reefs or artificial concrete facilities on the seabed.

[0018] Preferably, the wave-breaking net legs and the conductor frame legs are arranged at an angle of 5°~8°, which can guide the direction of the ocean current, reduce direct impact, and reduce the risk of structural fatigue; and form a space design that is narrow at the bottom and wide at the top to meet the needs of fish schools living in the lower layer and swimming in the upper layer; the inner layer of the breeding net and the outer layer of the wave-breaking net are surrounded at the bottom of the cage structure to reduce the risk of fish leakage, eliminate the need to add bottom nets at the bottom, and save material and installation costs; this angle range has been optimized through fluid mechanics to improve the flow resistance without significantly increasing the resistance, reduce load vibration and extend the life of the cage.

[0019] Preferably, the height intervals of the net are divided proportionally (pressure relief zone 0.2H~0.4H, transition zone 0.2H~0.4H, habitat zone 0.3H~0.5H) to ensure accurate function of each area; according to the biology of marine fish schools, vertical partitions are set proportionally so that the pressure relief zone can efficiently disperse the energy of the ocean current, the transition zone can be smoothly connected, and the habitat zone can provide a suitable water flow environment, thus realizing "partition optimization and overall coordination".

[0020] Preferably, a gradient design of mesh size is adopted (44mm~55mm in pressure relief zone, 35mm~45mm in transition zone, 25mm~35mm in habitat zone), which not only ensures the flow resistance of the pressure relief zone, but also avoids insufficient water exchange in the habitat zone due to too small mesh size. The mesh size is negatively correlated with water flow resistance. This design can significantly reduce the overall load and balance the load-bearing and water flow conditions of the partitions, ensuring that the fish can swim in the upper layer and live in the lower layer.

[0021] Preferably, the mesh wire diameter is designed with a gradient (4.0mm~4.6mm in the pressure relief zone, 3.2mm~4.0mm in the transition zone, 2.5mm~3.2mm in the habitat zone) to match the functional requirements of each zone; the thick mesh wire enhances the impact resistance of the pressure relief zone, and the thin mesh wire reduces the water flow disturbance in the habitat zone. The combination of the two can ensure stable mechanical properties and reduce material costs.

[0022] Preferably, the diameter ratio of the legs and the anchor foundation is designed (d1>D / 5, d2>d1, d2<2 / 5D) to ensure structural stability; the larger diameter of the wave-breaking net legs can disperse the current load, the moderate diameter of the jacket legs takes into account both strength and cost, and the anchor foundation is large enough to provide stable support.

[0023] Preferably, the habitat uses a low-resistance coating (Ra≤0.05mm) to reduce water flow noise and reduce fish stress response; at the same time, it reduces water disturbance, improves the uniformity of dissolved oxygen distribution, and improves the living environment of fish.

[0024] Preferably, the adjustable tension device can realize dynamic adjustment of the pre-tightening force of the net to adapt to different sea conditions; for example, the pre-tightening force can be increased before a typhoon to improve the flow resistance, and it can be appropriately relaxed at other times to optimize water exchange and extend the life of the net.

[0025] Preferably, the outer wave-breaking net adopts a double-layer structure of HDPE+PA. The outer layer of HDPE is UV-resistant and corrosion-resistant, and the inner layer of PA is high-strength and low-elongation. The composite anchoring system (gravity anchor + suction anchor) adapts to complex seabed geology and significantly improves pull-out resistance.

[0026] Preferably, the modular installation method is combined with sonar positioning to improve deep-sea installation efficiency; dynamic preload adjustment technology reduces manual diving operations and reduces installation costs; full-process monitoring ensures installation accuracy and reduces the risk of structural failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 A schematic diagram of a cage structure that can increase fish habitat friendliness in an embodiment; Figure 2 A cross-sectional view of an anchoring foundation of a cage structure that can increase fish habitat friendliness in an embodiment; Figure 3 A top view of a cage structure that can increase fish habitat friendliness in an embodiment; Figure 4 A schematic diagram of a cage structure net that can increase fish habitat friendliness in an embodiment; Figure 5 This is a schematic diagram of a cage structure partition arrangement that can increase fish habitat friendliness in an embodiment.

[0028] Among them, 1. The legs of the conductor frame; 2. The legs of the wave-breaking net; 3. The inner layer of the breeding net; 4. The outer layer of the breeding net; 5. The anchor foundation. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0031] 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 herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] As Figure 1 and Figure 2 shown, this embodiment provides a cage structure that can increase the habitat friendliness for fish, including jacket legs 1, wave - proof net legs 2, inner - layer culture net 3, outer - layer wave - proof net 4, and anchoring foundation 5. The jacket legs 1 and the wave - proof net legs 2 are paired and anchored to the seabed bedrock through the anchoring foundation 5. Multiple pairs of jacket legs 1 and wave - proof net legs 2 form a polygon at the anchoring points on the seabed bedrock. The inner - layer culture net 3 is tied to the jacket legs 1 to form an inner - layer polygon column. The outer - layer wave - proof net 4 is tied to the wave - proof net legs 2 to form an outer - layer polygon column. Both the inner - layer culture net 3 and the outer - layer wave - proof net 4 are divided into a pressure - relief area, a transition area, and a habitat area according to the same height interval to improve the habitat friendliness for fish.

[0033] As Figure 2 shown, the wave - proof net legs 2 vertically extend into the anchoring foundation 5 for fixation, and the jacket legs 1 obliquely extend into the anchoring foundation 5 for fixation. The included angle α between the center lines of the wave - proof net legs 2 and the jacket legs 1 is 5° - 8°. The inner - layer culture net 3 and the outer - layer wave - proof net 4 form an enclosure in an alternating pattern at the bottom of the cage structure. The layout of the wave - proof net legs 2 and the jacket legs 1 with an included angle of 5° - 8° can guide the direction of the ocean current, reduce the direct impact, and lower the risk of structural fatigue. And it forms a space design with a narrower bottom and wider top, adapting to the needs of fish to inhabit in the lower layer and swim in the upper layer, while reducing fish leakage. This angle range is optimized by fluid mechanics, which can improve the anti - current ability without significantly increasing the resistance, reduce the load vibration, and extend the service life of the cage.

[0034] As Figure 2 shown, the jacket legs 1 are cylindrical with an outer diameter of d1; the wave - proof net legs 2 are cylindrical with an outer diameter of d2; the anchoring foundation is cylindrical with an outer diameter of D. To enable the jacket legs 1 and the wave - proof net legs 2 to be paired and extend into the anchoring foundation for fixation, both d1 and d2 are less than D, and the sum of d1 and d2 is also less than D. Because the inner - layer culture net 3 on the inner side is subjected to more impacts from cultured organisms and has a greater load, the jacket legs 1 are thicker than the wave - proof net legs 2. Based on the above principle, the diameter d1 of the wave - proof net legs 2 is greater than 1 / 5 of the diameter D of the anchoring foundation, the diameter d1 of the wave - proof net legs 2 is less than the diameter d2 of the jacket legs 1, and the diameter d2 of the jacket legs 1 is less than 2 / 5 of the diameter of the anchoring foundation, that is, 0.2D < d1 < d2 < 0.4D. Specifically, D = 2m, d1 = 0.4m, d2 = 0.6m. The design of the diameter ratio of the legs to the anchoring foundation 5 ensures the structural stability. The wave - proof net legs 2 can disperse the ocean - current load, and the jacket legs 1 with a larger diameter bear the load of cultured organisms. The designs of both take into account strength and cost, and the anchoring foundation 5 is large enough to provide a stable support.

[0035] The total length of the wave-breaking net legs 2 is H; the height ranges of the pressure relief zone, transition zone and habitat zone are 0.2H~0.4H, 0.2H~0.4H and 0.3H~0.5H respectively. The height intervals of the nets are divided proportionally to ensure the precise function of each area; according to the biology of marine fish schools, vertical partitions are set proportionally so that the pressure relief zone can efficiently disperse the energy of the ocean current, the transition zone can be smoothly connected, and the habitat zone can provide a suitable water flow environment, realizing "partition optimization and overall coordination".

[0036] According to the simulation of the calculation software, the initial conditions are set as follows: the length, width and height of the cage structure are 25m * 25m * 30m, the height of the pressure relief zone, transition zone and habitat zone are all 10m, and the distance between the bottom of the cage and the seabed is 10m.

[0037] Under the same wire diameter, the relationship between mesh size and load size is:

[0038] Generally speaking, the seabed topography and geological conditions are stable. The closer the structure built in the sea is to the sea level, the greater the impact of wind, tides and currents, and the higher the surface flow velocity, the greater the load on the upper part of the net. Based on this principle, the mesh sizes of the habitat area, pressure relief zone and transition zone increase successively, which can increase the passage of high-velocity seawater in the upper layer, reduce frictional resistance, and thus reduce the load on the net.

[0039] In this embodiment, the mesh size ranges of the pressure relief zone, transition zone and habitat zone are 44mm~55mm, 35mm~45mm and 25mm~35mm respectively. The mesh size gradient design not only ensures the flow resistance of the pressure relief zone, but also avoids insufficient water exchange in the habitat zone due to too small mesh size; the mesh size is negatively correlated with the water flow resistance. This design can significantly reduce the overall load and balance the load and water flow of the partitions to ensure that the fish swim in the upper layer and live in the lower layer.

[0040] According to the simulation of the calculation software, the initial conditions are set as follows: the length, width and height of the cage structure are 25m * 25m * 30m, the height of the pressure relief zone, transition zone and habitat zone are all 10m, and the distance between the bottom of the cage and the seabed is 10m.

[0041] Under the same mesh size, the relationship between the diameter of the mesh and the load size is:

[0042] Generally speaking, the seabed topography and geological conditions are stable. The closer the structure built in the sea is to the sea level, the greater the impact of wind, tides and currents, and the higher the surface flow velocity, the greater the load on the upper part of the net. Based on this principle, the diameters of the net lines in the habitat area, pressure relief zone and transition zone are increased successively, which can increase the load-bearing capacity to adapt to the load formed by the high-velocity seawater in the upper layer, thereby improving the strength and safety of the net.

[0043] In this embodiment, the diameters of the mesh wires in the pressure relief zone, transition zone, and habitat zone are 4.0mm-4.6mm, 3.2mm-4.0mm, and 2.5mm-3.2mm, respectively. The mesh wire diameter gradient design matches the functional requirements of each zone; the thick mesh wire enhances the impact resistance of the pressure relief zone, and the thin mesh wire reduces the water flow disturbance in the habitat zone. The combination of the two can ensure stable mechanical properties and reduce material costs.

[0044] The inner breeding net 3 and the outer wave-breaking net 4 of the habitat are both made of low-resistance coating materials with a surface roughness of less than or equal to 0.05 mm to reduce water flow noise and water disturbance, and reduce fish stress response; at the same time, reduce water disturbance, improve the uniformity of dissolved oxygen distribution, and improve the living environment of fish.

[0045] The present invention also provides a method for installing a cage structure capable of increasing the friendliness of fish habitat, comprising the following steps: Modular assembly is performed on land, and the jacket legs 1, the wave-breaking net legs 2, the pre-partitioned inner layer aquaculture net 3, the outer layer wave-breaking net 4 and the anchor foundation 5 are pre-assembled into a transport module; Use the sonar positioning system to determine the cage installation location in the predetermined deep sea area; use the underwater robot to lift the transport module to the predetermined location; Install the anchor foundation 5 at the preset position around the cage, connect the jacket leg 1 and the wave-breaking net leg 2, and use the underwater monitoring equipment to adjust the layout of the anchor foundation 5 to ensure that the angle between the jacket leg 1 and the wave-breaking net leg 2 meets the requirements of fluid mechanics optimization; Unfold and install the inner breeding net 3 and the outer wave-breaking net 4 in the pressure relief zone, transition zone and habitat zone in sequence. If there is an adjustable tension device, use the tension adjustment structure to preliminarily pre-tighten the net to ensure that the initial tension at the connection between the net and the leg binding meets the design requirements.

[0046] This installation method adopts modular installation and combines sonar positioning to improve deep-sea installation efficiency; dynamic preload adjustment technology reduces manual diving operations and reduces installation costs; full-process monitoring ensures installation accuracy and reduces the risk of structural failure.

[0047] Example 2 The difference between this embodiment and embodiment 1 is that: 1) The cage structure of this embodiment that can increase the friendliness of fish habitat also includes an adjustable tension device; the inner culture net 3 is connected to the conductor frame leg 1 using an adjustable tension device to achieve dynamic adjustment of the pre-tightening force of the net; the outer wave-breaking net 4 is connected to the wave-breaking net leg 2 using an adjustable tension device to achieve dynamic adjustment of the pre-tightening force of the net.

[0048] 2) The outer wave-breaking net 4 is a double-layer structure, the outer layer is a high-density polyethylene (HDPE) material, and the inner layer is a nylon (PA) material. The double-layer structure is formed into a composite structure by hot-melt welding; the anchor foundation 5 adopts a combined structure of a gravity anchor block and a suction anchor.

[0049] The adjustable tension device may adopt a spiral buckle structure, which includes a screw, a nut, a frame and a connector. One end of the spiral buckle is tied to the longitudinal axis of the net, and the other end of the spiral mouth is fixed to the conductor frame leg 1 or the wave-breaking net leg 2. The adjustable tension device can realize dynamic adjustment of the pre-tightening force of the net to adapt to different sea conditions. For example, the pre-tightening force can be increased before a typhoon to improve the flow resistance, and it can be appropriately relaxed at normal times to optimize water exchange and extend the life of the net.

[0050] The outer layer of the outer wave-breaking net 4 is a double-layer structure, the outer layer is a high-density polyethylene (HDPE) material, the inner layer is a nylon (PA) material, and the double-layer structure is formed by hot-melt welding to form a composite structure. The outer layer of the wave-breaking net 4 adopts a double-layer structure of HDPE+PA, the outer layer of HDPE is UV-resistant and corrosion-resistant, and the inner layer of PA is high-strength and low-elongation.

[0051] The anchor foundation 5 adopts a combined structure of a gravity anchor block and a suction anchor. The composite anchoring system (gravity anchor + suction anchor) adapts to complex seabed geology and significantly improves pullout resistance.

[0052] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A cage structure that can increase the friendliness of fish habitat, characterized in that: The invention comprises a jacket leg (1), a wave-breaking net leg (2), an inner layer aquaculture net (3), an outer layer wave-breaking net (4) and an anchoring foundation (5); the jacket leg (1) and the wave-breaking net leg (2) are anchored to the seabed in pairs through the anchoring foundation (5); a plurality of pairs of jacket legs (1) and the wave-breaking net legs (2) form a polygon at the anchoring point of the seabed; the inner layer aquaculture net (3) and the jacket leg (1) are tied and connected to form an inner layer polygonal column; the outer layer wave-breaking net (4) and the wave-breaking net leg (2) are tied and connected to form an outer layer polygonal column; the inner layer aquaculture net (3) and the outer layer wave-breaking net (4) are divided into a pressure relief zone, a transition zone and a habitat zone according to the same height range, so as to improve fish habitat friendliness.

2. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The wave-breaking net legs (2) are vertically extended into the anchor foundation (5) for fixation, the conductor frame legs (1) are obliquely extended into the anchor foundation (5) for fixation, and the centerline angle α between the wave-breaking net legs (2) and the conductor frame legs (1) is 5° to 8°; the inner layer aquaculture net (3) and the outer layer wave-breaking net (4) are staggered at the bottom of the cage structure to form an enclosure.

3. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The total length of the wave-breaking net legs (2) is H; the height ranges of the pressure relief zone, transition zone and habitat zone are 0.2H~0.4H, 0.2H~0.4H and 0.3H~0.5H respectively.

4. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The foot sizes of the pressure relief zone, transition zone and habitat zone range from 44mm to 55mm, 35mm to 45mm and 25mm to 35mm respectively.

5. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The diameters of the mesh wires in the pressure relief zone, transition zone and habitat zone range from 4.0 mm to 4.6 mm, 3.2 mm to 4.0 mm and 2.5 mm to 3.2 mm respectively.

6. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The diameter of the wave-breaking net legs (2) is greater than 1 / 5 of the diameter of the anchor foundation (5), the diameter of the wave-breaking net legs (2) is smaller than the diameter of the jacket legs (1), and the diameter of the jacket legs (1) is smaller than 2 / 5 of the diameter of the anchor foundation (5).

7. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The inner layer breeding net (3) and the outer layer wave-breaking net (4) of the habitat area are both made of low-resistance coating materials, and the surface roughness is less than or equal to 0.05 mm.

8. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: It also includes a tension adjustment device; the inner layer aquaculture net (3) is connected to the conductor frame support leg (1) using an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force; the outer layer wave-breaking net (4) is connected to the wave-breaking net support leg (2) using an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force.

9. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The outer wave-breaking net (4) is a double-layer structure, the outer layer is made of high-density polyethylene (HDPE) material, and the inner layer is made of nylon (PA) material, and the double-layer structure is formed into a composite structure by hot-melt welding; the anchor foundation (5) adopts a combined structure of a gravity anchor block and a suction anchor.

10. A method for installing a cage structure capable of increasing fish habitat friendliness according to any one of claims 1 to 9, characterized in that: The following steps are involved: Modular assembly is performed on land, whereby the jacket legs (1), the wave-breaking net legs (2), the pre-partitioned inner layer aquaculture net (3), the outer layer wave-breaking net (4) and the anchor foundation (5) are pre-assembled into a transport module; Use the sonar positioning system to determine the cage installation location in the predetermined deep sea area; use the underwater robot to lift the transport module to the predetermined location; Install the anchor foundation (5) at a preset position around the cage, connect the jacket legs (1) and the wave-breaking net legs (2), and use underwater monitoring equipment to adjust the layout of the anchor foundation (5) to ensure that the angle between the jacket legs (1) and the wave-breaking net legs (2) meets the requirements of fluid mechanics optimization; The inner layer aquaculture net (3) and the outer layer wave-breaking net (4) of the pressure relief zone, transition zone and habitat zone are sequentially unfolded and installed. If an adjustable tension device is provided, the net is initially pre-tightened using a tension adjustment structure to ensure that the initial tension at the connection between the net and the leg binding meets the design requirements.

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