CN110622900A - Articulated net cage for open sea cultivation - Google Patents

Articulated net cage for open sea cultivation Download PDF

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Publication number
CN110622900A
CN110622900A CN201910565582.0A CN201910565582A CN110622900A CN 110622900 A CN110622900 A CN 110622900A CN 201910565582 A CN201910565582 A CN 201910565582A CN 110622900 A CN110622900 A CN 110622900A
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Prior art keywords
cage
net cage
net
floating
ballast
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周俊麟
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周俊麟
周泳
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Priority to CN201510881815X priority Critical
Priority to CN201510881815 priority
Application filed by 周俊麟, 周泳 filed Critical 周俊麟
Priority to CN201610326463.6A priority patent/CN105766749B/en
Publication of CN110622900A publication Critical patent/CN110622900A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

Abstract

The invention discloses an open sea aquaculture articulated net cage. The net cage is composed of 6 parts: the first is an annular watertight floating box body made of steel (or reinforced concrete) materials, which is called a net cage unit; the second is a movable connecting part which connects the net cage units and is called as a hinge part; thirdly, arranging netting gears for cultivating various aquatic products in the middle water area of the annular buoyancy tank; fourthly, the central floating body of the working and living cabin of the management personnel and equipment such as a power station, a pump cabin, an oil cabin, a pipeline and the like is arranged in the center of the annular floating body and is called a central island; fifthly, a 'ballast-submergence-floatation system' consisting of an air pipe and a ballast water system; and the sixth is an anchoring system consisting of equipment or parts such as anchors, anchor chains, winches and the like, and can tie the whole net cage to the seabed. This entire system is called a cage module. A plurality of the net cage modules form a large-scale fishing ground.

Description

Articulated net cage for open sea cultivation
The scheme is divided into separate applications by taking an invention patent with the application date of 2016, 05 and 17, the application number of 201610326463.6 and the name of 'an open sea aquaculture wind wave resistant hinged net cage' as a parent.
1. The technical field is as follows:
this patent is from technical angle, relates to the comprehensive application to boats and ships and ocean engineering technique, belongs to boats and ships and ocean engineering equipment class technical field. The patent is mainly applied to aquaculture, so the patent also can belong to the technical field of marine aquaculture tools.
2. Background of the invention
With the development of economy in China, people have more and more demands on aquatic products and higher requirements on quality. The fishing boat is far from the river, lake and sea to salvage natural fishes, which can not meet the market demand. Nowadays, many inland rivers, inland seas, coastal gulfs close to continents and coastal seas in China are covered by the aquaculture net cages of numerous fishery farmers. In order to save cost, most of the net cages used by fishermen nowadays are small-sized net cages made of plastics, foams, woods and the like. Does not have the resistance to the great waves of the open sea.
At present, the industries and technologies for large-area aquaculture using inland rivers, inland seas and gulfs have the following disadvantages:
(1) the development of too many aquaculture net cages occupies a large amount of limited water area, and conflicts with the development of industries such as coastal industry, house and land industry, tourism industry and the like for competing for the water area are generated, so that numerous group events are stimulated.
(2) High-density aquaculture in inland rivers and seas also causes pollution to large water areas and causes degradation of the quality of various aquatic products.
Therefore, in order to fundamentally solve the problem that aquaculture occupies large areas of inland and inland river water, the aquaculture needs to be 'overseas'.
The aquaculture is 'open sea', and inexhaustible plankton in open sea can be used as bait, so that the aquaculture cost is greatly reduced; high-quality and delicious aquatic products can be obtained; in addition, the open sea has a strong self-cleaning function, and can solve the problem of water area pollution caused by aquaculture. The aquaculture of the open sea is the development direction of the aquaculture industry.
The technical difficulties in realizing the open sea of aquaculture mainly lie in:
(1) safety problems in aquaculture
China is a water area with a plurality of typhoons in coastal areas (particularly in the southeast coastal area). The problem that the operation of cultivation personnel is unsafe and the net cage is easy to damage due to huge open sea wind waves must be solved for aquaculture.
(2) High cost
It has been proposed to artificially create a "quiet" bay by enclosing an open sea area near continents suitable for aquaculture with a breakwater. This idea is impractical. The reason is that: if a 'fixed' breakwater is built, the cost is extremely high, the cultured water area is separated from the outside, the seawater cannot flow freely and becomes 'fish culture in the enclosed sea', even if the outside sea is changed into the inside sea, the seawater can not be used for a long time, and the condition similar to that the limited water area of the fishing ground is covered by the net cage at present can be formed; if the floating breakwater is built, the cost of the net cage is still high, the effectiveness of the floating breakwater in actual storm is greatly reduced under the condition of extra-large storm (such as the attack of large typhoon), and the breakwater still has great safety risk.
Therefore, the fundamental way to realize the 'open sea' of aquaculture is to create an anti-wave aquaculture net cage.
3. Summary of the invention
The patent aims to provide an open sea aquaculture technology taking an annular hinged net cage as a core technology, aiming at the problems that the net cage used for the existing open sea aquaculture can not resist the wind and waves of the open sea, and the floating breakwater matched with the net cage has poor actual effect and great safety risk in the case of extra large typhoon.
3.1 basic idea of the patent technical solution
3.1.1 compromise between Ship Performance and Strength
The common knowledge tells that a small ship in a park can not go to the sea for navigation, but a large ship can. The reason for this is that the "stability" of a large vessel is good. However, the total longitudinal bending moment of the large ship on the waves is very large, and the structure is easy to damage. If the ship is made into a ring shape, the construction cost can be greatly reduced, and larger water plane inertia moment can be obtained, so that larger initial stability and high degree can be obtained; if the longer ship is divided into a plurality of sections which are hinged, the ship is not easy to sink and the structural strength can be ensured, thus the contradiction between the performance and the strength can be considered. The basic principle of the ring-shaped hinged net cage provided by the patent is based on the basic principle.
3.1.2 maximum design wind class for open sea
The net cage provided by the patent has strong wind and wave resistance, does not need to use a breakwater, is suitable for 'infinite sea areas' except 'polar areas' (near north and south poles), and is particularly suitable for 'continental shelf' shallow sea areas in China with the water depth of 30-100 m.
One of the characteristics of the coastal water areas of China is as follows: typhoon and other disastrous weather appear more frequently. For example, in the area of Luoyuan and Lianjiang in the middle of the coast of Fujian, tropical storms or high typhoons occur every year according to the data of offshore observation stations (1985-. In normal weather, the annual average wind speed at seaside is only about 3.1m/s, but when disastrous weather such as typhoon occurs, the maximum wind speed can reach 46.7m/s in 10 minutes, which is equivalent to the Typha wind grade of 15, and the damage caused by the wind speed is extremely serious. Therefore, the 'design wind level' applicable to the net cage is determined to be 16-class Pufu, namely the wind speed 10m from the sea surface is 53.5 m/s. Corresponding to one hundred years. This patent box with a net must have sufficient stability and structural strength under the effect of maximum design wind-force.
3.1.3 regarding stability and structure:
from the design and calculation method, the annular net cage provided by the patent is actually a ship with a hollow middle, and completely conforms to the characteristics of the ship defined by the classification society regulations. Therefore, mature theories and methods, specifications, regulations and the like related to ship design and construction can be applied mechanically, and the method has strong practicability. But even so, must be verified by rigorous ship model testing at the time of design.
According to the method commonly used in ship engineering, the stability of the annular net cage provided by the patent is proved to be good through preliminary performance calculation. The reason for this is that: the net cage has large waterplane inertia moment, low gravity center and small wind area, and can not overturn even though the wind power is large. The conclusion of the preliminary structural calculation is that: because the net cage adopts the 'hinge joint', namely, each part (unit) is connected with a bollard (commonly called as 'bollard') by a short cable, the total longitudinal bending moment and the shearing force of the net cage are greatly reduced, and the safety of the structure of the net cage body can be ensured. The most loaded is the 'bollard and short cable' and its structural reinforcement, belonging to the local reinforcement category. The short cable connecting piece is conventional mooring equipment of the ship and can be applied according to the standard mode of ship specification. The connection safety can be ensured as long as a certain safety factor is taken.
The theory and practice of ship structure mechanics have proved that: for a vessel placed on waves, if the wavelength λ is much smaller than the length L of the vessel, i.e. λ/L<<1, then several wave crests and wave troughs appear in the range of the ship length L, and the wave height H thereof1/3The buoyancy is small, the change of the buoyancy relative to the static water state is not large, and large wave additional bending moment cannot be generated; conversely, if the wavelength λ is much greater than the ship length L, i.e., λ/L>>Although the wave height is large, the wave surface is not greatly different from the hydrostatic surface in the range of the ship length L, and large wave additional bending moment cannot be generated. Aiming at 16-grade super-large strong typhoon, the hinge mode of the utility model is adopted to reduce the characteristic length L of the largest module of the net cage, namely lambda/L>>1, so that the generated additional wave moment is not large(see example calculations of this patent).
3.2 composition of wind and wave resistant hinged net cage for open sea culture
3.2.1 "open sea farming" base:
the term "open sea" as used herein generally refers to a sea area remote from the continental land. When the aquaculture industry is engaged in the open sea, the problems such as supplement, bait, breeding, life and working conditions of managers, equipment maintenance and the like need to be solved by self. Generally, an intensive management mode is adopted, and the net cages are combined into a group to form a base. The "base" is generally set in the open sea water area where natural fish swims back and the natural bait is rich. In the 'base', a certain number of wind power stations, solar power stations, helicopter parking ramps, tourist attractions and the like can be arranged.
3.2.2 basic components of the cage of this patent (see FIG. 1)
This patent open sea is bred anti-wind and wave type articulated box with a net is by 6 most constitutions. The first one is a ring watertight floating box body constructed by steel (or reinforced concrete) material, called as net box unit, on which air pipes are arranged; secondly, the movable connecting parts connecting the net cage units are called as hinge partsA plurality of the units are connected to form a large annular floating body; thirdly, the net for cultivating aquatic products is arranged in the middle water area of the annular buoyancy tank; fourthly, in the center of the large annular floating body, the central floating body is provided with equipment such as a power station, a pump cabin, an oil cabin, a pipeline and the like, and a cabin for managers to work and live in, and is called a central island I; fifthly, the 'ballast-submergence-floatation system' consists of an air pipe, a ballast water pump, a ballast pipe system, a remote control valve system and various devices arranged in a cabin centralized control room; sixth, it is an anchor system consisting of anchor, anchor chain and winch, and can tie the whole net cage to seabed. This entire system is called a cage module. A plurality of net cage modules are connected together,forming a fishery base.
3.2.3 'ring floating box body' (called net box unit III),
the 'annular floating box body' is a floating box body with a watertight structure. The interior is divided into a plurality of watertight compartments which are connected by ballast water lines. Ballast water can be pumped in (or out) according to ballast requirements to keep the net cage unit in a floating state; when a large red tide or a large storm attacks, the whole net cage module can submerge to a certain depth below the water surface. The deck at the upper part of the box body can be used as a walking path or a channel for putting in a bait trolley; and equipment or facilities such as an anchoring system, an air pipe and the like are arranged at a certain position of the box body.
The shape of the net cage module can be various shapes. This example takes the shape of a circle. The whole cage module can be divided into a plurality of blocks (2 blocks in the example) in the radial direction, and can also be divided into a plurality of petals (8 petals in the example) in the circumferential direction to form a plurality of 'units' (16 units in the example).
3.2.4 about the "hinge"
The scheme of the net cage unit connection proposed by the patent is that a flexible combined type detachable connection system is formed in a hinged mode, namely, the net cage units are allowed to move freely within a small range but cannot be separated from each other.
The hinge in this example has two forms: one is that the 'hinge part' on the deck is composed of a steel cable and a tie column; the hinge part at the lower part of the box body is formed by a locking steel cable winch, a hydraulic bolt and a steel cable. When the connecting cable is tensioned, the adjacent two units can be connected together. Rubber anti-collision pads are arranged among the net cage units.
The connection mode of the short cables between the net cage units and the mooring posts in a hinged mode is a common connection mode between ships and between the ships and the shore, but the short cables used in the patent can be fastened by using winch hydraulic drums, and the mooring posts can be locked by bolts controlled by hydraulic oil cylinders.
The penmen conducted theoretical discussion and computational verification on the tightness of the "hinged" connection, and proved that different connection tightness had great influence on the movement and structural strength of the ship on waves. Attention should be paid.
3.2.5 relates to "netting gear" (see fig. 1)
The net for cultivating aquatic products in open sea is tied in the lower water area of the floating body net cage, and when extra-large red tide or extra-large storm comes, the upper part of the net cage can be covered by the net, so that the survival of the cultivated fishes can be still maintained when the net is sunk to a certain depth under water.
The net can be provided with 1 or 2 layers of nets on the side surfaces and the bottom surface according to requirements. The outer layer net can be woven by steel wire ropes and is mainly used for preventing the injury of fierce fishes such as sharks to fishes cultured in the net, and the inner layer net is woven by nylon wires and is used for protecting (isolating) the cultured fishes. The weight sinker is arranged below the net.
3.2.6 pertaining to "Central island" (see FIG. 1)
The central island is a large floating body arranged in the center of the whole large-scale net cage, the central island is actually a ship, an upper-layer building is arranged on a main deck of the ship body, and a living cabin, an office, a conference room, a research room, signal equipment, an air pipe and the like of personnel are arranged in the upper-layer building.
An engine room is arranged below the main deck of the ship. The engine room is internally provided with a diesel generating set, a bilge pump, a general distribution board, a control room, a fuel tank, a whole ship piping system, a ballast, a submergence and floatation system, various auxiliary equipment and the like.
3.2.7 about "ballast-submergence-levitation System"
The ballast-submergence-floatation system similar to a submarine consists of an air pipe with an opening and closing valve, a ballast pump, a ballast pipe system capable of reaching each watertight compartment of the whole net cage and a remote control valve system. When extra red tide or extra wind wave comes, the sea valve is opened, sea water is sucked, and the net can be sunk to a certain depth under water. Under the condition of normal sea conditions, the ballast pump is started, ballast water is discharged, and the net cage can float to a normal floating state. Because the sinking depth is not large, the net cage still belongs to an air pipe state, and the net cage still has certain stability.
3.2.8 relating to mooring systems
The anchoring mode is determined according to the water depth of the sea area where the net cage is located. For shallow sea with water depth of about 30-150 m, the anchoring system can be designed according to the conventional anchoring scheme of the ship; the system consists of an anchor machine, an anchor chain (or an anchor cable) and an anchor; the anchor used is generally a gravity anchor made of reinforced concrete.
For deep sea areas with water depths of hundreds of meters, even more than kilometers, a dynamic positioning system can be adopted.
4. Description of the drawings:
FIG. 1 is a schematic diagram of: schematic diagram of open-sea aquaculture wind-wave-resistant articulated net cage
Brief description of the drawings figure 1:
this figure reflects the main technical features of this patent: the net cage units arranged on the wave sea surface are connected in a hinged mode through steel cables and tie columns (or hydraulic bolts) to form an integral stable net cage module, so that the safety of the integral structure is guaranteed, and the stability is good. Managers mainly live and move in the central island, the swing amplitude is small, and the working and living conditions are good.
As an example, the main dimensions are as follows:
the legend for FIG. 1 is:
central island
② engine room
Third, the net cage unit
Fourthly, the main deck
Connecting short cable and tie column on deck
Sixth air pipe
Seventhly, a dynamic positioning device (Z push) (DP-1)
Eight netting gear
Weight of the net
Anchor machine and chain locker for wave front and rear
Rubber cushion block
Wharf
Hinge member
5. Detailed description of the preferred embodiments
The following provides a design example of an articulated cage module with a diameter of 200m according to the design principle of ships, and illustrates the specific implementation mode:
5.1 design basis:
5.1.1 the use of the net cage in the sea area:
the net cage is suitable for Fujian Nenjiang-mansion gate, and is positioned in a vast sea area with the east diameter of 118-120 degrees and the north latitude of 23-26.5 degrees (the calculation example is 25 degrees N, and the coefficient of the Coriolis force of the earth rotation is 0.22), and the sea area is a plurality of wind and water areas.
5.1.2 design wind level: the Pufu wind class 16 super typhoon (10 m wind speed on sea surface, Urmax being 53.5 m/s).
The measured data of a certain meteorological station to a primary extra typhoon is as follows:
local average atmospheric pressure Pa 1013.6 hectopascal (hPa)
Typhoon center wind pressure: po 914 hectopa
Air pressure difference: Pa-Po 99.6 hectopa
Maximum wind speed radius (distance from typhoon center): r27 nautical miles 50km
Typhoon moving speed: 20 section of Uf is 37.0km/h is 13.37m/s
5.2, calculating wave elements in the typhoon area:
the term "wave element" as used herein means the wave height H1/3, the wavelength λ, and the period T1/3.
The following empirical formula was used for the more general Bretschneider (1957)
5.2.1 calculate the maximum value of the wave element for 16-stage typhoons as follows:
the maximum gradient wind speed (Ug) max at 10m above sea surface is:
(Ug)max=0.868×[73×0.1718×(ΔP)1/2-0.575R×0.22]
105.23 (node) 54.14m/s
The maximum sustained wind speed Ur (node) at 10m above the sea surface is given by:
for a mobile typhoon:
urrmax ═ 0.865 × (Ug) max +0.5Uf ═ 104.02 section 53.52m/s
The value is equivalent to the 16-class Typha wind grade, after Urrmax is obtained, the following two formulas are used for obtaining the deep water maximum effective wave height H formed by the typhoon1/3maxAnd period T1/3max
H1/3max=5.03exp(0.000295×R×ΔP)
×(1+0.208×Uf/(Ur)^(1/2))=17.02m
T1/3max=8.6exp(0.000148×R×ΔP)
×(1+0.104*Uf/(Ur)^(1/2))=16.2s
From the table of the relationship between the period of the deep water wave and the calculated wavelength, the wavelength corresponding to this wave period can be found as follows:
λmax=545.5m
after the typhoon is formed, the typhoon eyes are called within 10km of the typhoon center, and almost no wind exists. The wind speed increases in proportion to r in a range of about 40-50km from the center of the typhoon, which is called "typhoon inner zone". The maximum value of the wind speed Urmax, called the "maximum wind speed radius R" (50 km in this case), often occurs at the outer edge of 40-50km from the centre of the typhoon; beyond this distance, up to a radius of 500km, called the "ectodomain region", the wind speed decreases roughly by a ratio of 1/r ^ (1/2); the distance r increases again to 800km, which can be considered as "outside the typhoon circle", and the wind speed will decrease in proportion to 2/r.
The wave caused by the offshore typhoon also has a process of generating, developing and stabilizing to gradually weakening and disappearing. In this process, component waves of various wavelengths, wave heights, and periods are likely to occur. For ships (including net cages), the wave with the longest or shorter wavelength is not the largest destructive force on the structure, but the component wave with the ratio of the wavelength to the length of the ship close to 1.0. Therefore, the stability of the net cage is calculated according to the maximum wind speed; when the stress of the structure is calculated, the stress is considered according to the ratio of the wavelength lambda to the characteristic length L of the net cage unit, which is approximately equal to 1.0.
5.2.2 selecting the characteristic lengths of 3 net cages and calculating the wave elements of the net cages
Firstly, the whole net cage (diameter) "ship length", L1 is 200 m; secondly, taking the central island and the inner ring unit of the net cage, wherein the diameter L2 is 120 m; secondly, the length L3 of the outer ring unit of the net cage is taken as 75m, and the wave element of the maximum wave load condition is calculated by trial:
through the analysis of pen regression, the conventional wind speed Ur and the wave height H are obtained1/3The relationship of (a) is as follows:
H1/3=0.08×Ur1.55
and then applying a regression formula of the wind speed and the wind level proposed by other researchers:
Ur=0.836×B1.5
the following can be obtained: h1/3=0.08×(0.836×B1.5)1.55=0.0606×B2.325
In the "typhoon territory", the wave height H is assumed1/3Period T1/3Also roughly reduced by the ratio of 1/r ^ (1/2), so that the wave height H at the wavelength can be estimated1/3Period T1/3As in the following table:
(see attached Table 2)
Specific sea area typhoon area wind wave element calculation table
5.2.3 comparison of stress conditions of the integral structure and the hinge structure:
according to the empirical formula provided by typhoons, the following rough calculation can be seen: after a typhoon is formed and stabilized, the area with the greatest harm to the structural strength of the ocean engineering structure is not the area with the greatest wind speed, because the maximum wavelength λ max is usually far larger than the characteristic length L of the structure. But moves away from the structure at the typhoon centre by a certain distance (e.g. 102km in this case)) At the same time, the wave height H is exactly the same as λ 1 ═ L1 (in this example, L1 ═ cage diameter D), and at this time, the wave height H is1/3The height is 11.91m, the depth of the cage frame is only 6.5m, and if the center of the integral structure is positioned at the wave height H1/3When the wave length is 11.91m and the wave length is 200m, the additional wave bending moment is relatively large (by this example, if the wave height is 1/20 ship length according to the conventional calculation method of the ship, namely the calculated wave height is 10m, it is dangerous); however, if the structure is hinged, the wavelength and wave height of the most dangerous state are both reduced, for example, λ 3 ═ 75m, and at this time, the wave height H is1/3At 7.46m, the structural strength of the vessel is much safer. According to the law that the wave additional total longitudinal bending moment of a ship is in direct proportion to the square of the ship length and the wave additional shear force is in direct proportion to the ship length, if the whole cage is 100%, a main body consisting of a central island and an inner ring is hinged with an outer ring unit, and the central island is hinged with the inner ring and then hinged with the outer ring unit, wherein the wave additional total longitudinal bending moment ratios of the three conditions are as follows: 100%, 36%, 14.64%; the wave additional shear ratio is as follows: 100%, 60%, 38.27%. The illustration is very different. (see attached Table 3)
The calculation results of the examples of this patent are shown in the attached table 1.
Accessories:
attached table 1: main parameter summary table of open-sea aquaculture wind wave resistant articulated net cage example

Claims (6)

1. The open-sea aquaculture articulated net cage is characterized in that the open-sea aquaculture wind wave resistant articulated net cage consists of 6 parts, wherein one part is an annular watertight floating box body and is called a net cage unit; secondly, movable connecting parts, called as hinge parts, for connecting the net cage units are connected, and a plurality of the units are connected to form a large annular floating body; thirdly, arranging netting gears for cultivating various aquatic products in the middle water area of the annular watertight floating box body; fourthly, in the center of the large annular floating body, the central floating body is provided with a power station, a pump cabin, an oil cabin, a pipeline and a working and living cabin for managers and is called a central island; fifthly, the 'ballast-submergence-floatation system' consists of an air pipe, a ballast pipe system and a remote control valve system; the sixth one is anchoring system, the whole net cage is tied to the sea bottom; this entire system is called a cage module;
the hinge is composed of a steel cable and a tie column on the deck, and the lower part of the box body is composed of a hydraulic bolt and a steel cable, wherein the hydraulic bolt is used for locking the tie column; when the connecting cable is tensioned, the adjacent two units are connected together.
2. The articulated open-sea aquaculture cage of claim 1, wherein said annular floating cages, i.e. cage units, are divided into watertight compartments connected by ballast pipe systems; pumping ballast water in or out according to ballast requirements to keep the floating state of the net cage unit; the whole net cage module can also be submerged to a certain depth below the water surface; the deck at the upper part of the box body is used as a pedestrian path or a channel for putting in a bait trolley; an anchoring system and an air pipe are arranged at a certain position.
3. The articulated open-sea cage of claim 1, wherein the net for cultivating various aquatic products is tied in the lower water area of the floating cage, and the upper part of the cage can be covered by the net, so that the survival of the cultivated fish can be maintained when the net is submerged to a certain depth.
4. An open-sea aquaculture articulated cage as claimed in claim 1, wherein said "central island" is a large floating body centrally located throughout the large cage, with the cabin, diesel power plant, oil tank and full cage control systems, crew accommodation, signaling systems and ballast-submergence-floatation systems.
5. The open-sea aquaculture articulated cage of claim 1, wherein said ballast-submergence-floatation system is comprised of ballast pumps, air pipes with remote control valves, ballast pipe systems to access the watertight compartments of the entire cage, and remote control valve systems; when extra red tide or extra wind wave comes, the seabed valve can be opened, and the net cage is sunk to a certain depth under water.
6. The open-sea aquaculture articulated cage of claim 1, wherein said mooring system is comprised of an anchor machine, a chain or cable and anchors; the anchor used is a gravity anchor made of reinforced concrete.
CN201910565582.0A 2015-12-04 2016-05-17 Articulated net cage for open sea cultivation Pending CN110622900A (en)

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