CN114319459A

CN114319459A - Equipment for water-blocking protection and sediment siltation of scouring pit

Info

Publication number: CN114319459A
Application number: CN202210036696.8A
Authority: CN
Inventors: 陈旭光; 金帅; 解安琪; 刘茜茜; 张凤鹏; 严加豪
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-04-12
Anticipated expiration: 2042-01-13
Also published as: CN114319459B

Abstract

The invention relates to equipment for water-blocking protection of a scour pit and silt back-silting, and belongs to the technical field of offshore wind power and aquaculture. The apparatus of the present invention comprises: the system comprises a pile foundation main body, a fish culture net cage, a second shrimp and shellfish culture net cage, a first shrimp and shellfish culture net cage and a pile foundation diversion box; the front, the back and the two sides of the pile foundation main body are respectively provided with a post front diversion box, a post diversion box and a fish culture net cage, the first shrimp and shellfish culture net cage is arranged below the post front diversion box and the post diversion box, and the second shrimp and shellfish culture net cage is arranged below the fish culture net cage. The pile front diversion box is used for collecting the pile front submerged water flow, the water flow is conveyed into the fish culture net cage through the diversion holes, the water flow is cut off, and the formation of the horseshoe vortex is reduced fundamentally. And the post-pile diversion box is used for collecting climbing water flow, redirecting the water flow back to the shrimp and shellfish type net cage at the middle rear part and depositing again. An internal circulation field is formed, plankton or nutrient substances are provided for the fishes, and meanwhile, the fishes are intercepted in multiple layers, so that the loss of silt is slowed down.

Description

Equipment for water-blocking protection and sediment siltation of scouring pit

Technical Field

The invention relates to equipment for water-blocking protection of a scour pit and silt back-silting, and belongs to the technical field of offshore wind power and aquaculture.

Background

With the rapid development of global economy, energy demand is increasing day by day. Due to the continuous consumption of fossil energy sources such as petroleum, coal and natural gas and the environmental pollution caused by the fossil energy sources, new pollution-free and sustainable energy sources are increasingly sought by various countries. China has wide sea and land areas, is also in the east Asia monsoon region, and vast coastal provinces have abundant wind power energy, so that the problem that the energy in China is single is solved, the carbon neutralization and carbon peak reaching distant view targets are realized, and a large number of pile foundation type offshore wind power generation units are built in Liaoning, Shandong, Jiangsu, Zhejiang, Fujian and Guangdong coastal areas successively in China.

Under the influence of ocean currents, vortex and torrent can be produced around the pile foundation, cause its surrounding silt to be washed away, and then form and erode the hole. The flow field of the scour pit is as follows: when the ocean current meets the pile foundation, a karman vortex street is formed in the horizontal direction, a submerged current is formed in the vertical direction and impacts the seabed, a horseshoe vortex is formed at the bottom, the horseshoe vortex moves around the pile along with the ocean current, and the water current ascends along the pile foundation and flows out of the pit at the rear part of the single pile; therefore, the scouring pit scours seriously at 45 degrees respectively at the left and right of the front part.

The problem of pile foundation washout pits at the present stage is mainly prevented and treated, for example, a bionic aquatic weed laying method has a good protection effect, but the method is expensive, complex to install and immature depending on foreign technologies and domestic technologies. The overall cost of the sand bag and sand quilt throwing protection method, the stone throwing and gabion protection method and the concrete and grouting chain row protection method is low, but the methods all have the risk of damaging the submarine cable. In addition, certain precision needs to be ensured during construction of the stone or sand bag throwing method, and underwater robots or divers are needed for assistance during construction. The protection period of sand bag sand quilt, grouting, solidified soil and other methods is short, and the regular inspection and construction are required. In reality, the backfilling cost of the pile foundation scoured pit is huge, the formed scoured pit treatment means is single by technical engineering personnel, and the huge space in the scoured pit is not developed and utilized.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide equipment for water-resisting protection of a scoured pit and silt back-silting. The equipment of the invention can play the roles of preventing and controlling the scoured pit and backfilling the scoured pit.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a erode protection of pit that blocks water and silt back-silting equipment, includes:

a pile foundation main body;

the fish culture net cages are arranged on two sides of the pile foundation main body; the fish culture net cage comprises a vertical diversion pipe and a buffer box, wherein the vertical diversion pipe is vertically arranged in the fish culture net cage;

the second shrimp and shellfish culture net cage is arranged below the fish culture net cage; the second shrimp and shellfish culture net cage is in a triangular prism shape, and edges are vertical to the pile foundation main body; the second shrimp and shellfish culture net cage is provided with a top surface and a bottom, the top surface is opposite to the bottom, the top surface is contacted with the bottom surface of the fish culture net cage, and the bottom is inserted into the sediment;

the pile foundation flow guiding box comprises a box top, a box bottom, a front wall, a left side wall and a right side wall, wherein the box top is provided with a submerged water flow inlet, the box bottom is provided with an ascending water flow inlet, the front wall is provided with a flow guiding port, the left side wall and the right side wall are both provided with flow guiding holes, and the submerged water flow inlet and the ascending water flow inlet are both one-way inlets; the pile foundation flow guiding box comprises a pile front flow guiding box and a pile rear flow guiding box; the pile front guide box is arranged on the front side of the pile foundation main body, and the pile rear guide box is arranged on the rear side of the pile foundation main body; the drainage port of the pile front drainage box is connected with the bottom port of the diversion vertical pipe, and the drainage port of the pile rear drainage box is connected with the buffer box; and the number of the first and second groups,

the first shrimp and shellfish culture net cage is arranged below the post-pile diversion box and the post-pile diversion box.

The flow of water at the flushing pit is shown in figure 5. The submerged water flow exists on the front side of the pile foundation, the pile front guide box is used for collecting the pile front submerged water flow, the water flow enters the pile front guide box through a submerged water flow inlet, the water flow is conveyed into the fish culture net cage through the guide holes, and the water flow flows upwards through the guide vertical pipes in the fish culture net cage; the water flow is intercepted, so that the water flow does not pass through the bottom of the scouring pit, and the formation of the horseshoe vortex is reduced radically.

There is rivers to climb the pile foundation rear side, carries silt and nutrient substance because rivers climb from the bottom this moment, through the water conservancy diversion box behind the stake, flows back the rivers back again in the shrimp shellfish type box with at middle and rear portion, deposits again. An internal circulation field is formed, plankton or nutrient substances are provided for the fishes, and meanwhile, the fishes are intercepted in multiple layers, so that the loss of silt is slowed down.

The water flow inlet is set as a one-way valve, so that different flow directions in the rising tide and the falling tide can be utilized.

In order to enable the energy of the water flow entering the pile foundation diversion box to be more concentrated and prevent the energy of the water flow from being wasted; the pile foundation diversion box is characterized in that a first diversion plate and a second diversion plate can be further arranged inside the pile foundation diversion box, the first diversion plate and the second diversion plate are arranged at the bottom or the top of the box, two ends of the first diversion plate are respectively positioned on the left side wall and the right side wall, two ends of the second diversion plate are respectively positioned on the left side wall and the right side wall, and the distance from the first diversion plate to the front wall is smaller than the distance from the second diversion plate to the front wall; the height of the first baffle and the second baffle is less than the distance from the top of the box to the bottom of the box. Preferably, the first baffle is higher than the second baffle. First guide plate is a little higher than the second guide plate and can make the rivers that get into pile foundation water conservancy diversion box produce a fall when passing through first guide plate and second guide plate to make the kinetic energy of rivers stronger some.

The pile foundation diversion box is in a shape of a circular truncated cone sector, the front wall is a convex surface, the rear wall is a concave surface, and the bending amplitude of the front wall and the bending amplitude of the rear wall are both 60-75 degrees. The pile foundation diversion box is designed into a circular truncated cone shape, and can cover most of flow direction of the pile foundation, so that the protection area and the sediment interception area are improved while the main flow direction is considered. At the moment, the first guide plate and the second guide plate are parallel and are curved surfaces, and the bending amplitude is consistent with that of the front wall or the rear wall.

The lower part of the fish culture net cage is provided with a fish excrement collecting area which is in a conical surface shape, the conical top is downward, and the conical top is open; the vertical diversion pipe vertically penetrates through the fish excrement collecting area. The fish excrement collecting area is arranged to separate a water flow inlet and bottom sediment while keeping excrement in the culture tank to be timely cleaned, so that water flow is prevented from directly impacting the bottom of a pit to play a role in buffering. And backfilling the scoured pit with the excrements in the water stream obtained by water blocking.

A collecting platform is arranged in the second shrimp and shellfish culture net cage and is positioned below the fish excrement collecting area; the diversion holes of the pile-leading diversion box guide the water flow to the collection platform. If the collecting platform is not arranged, the fish excrement is directly accumulated in one area of the second shrimp and shellfish culture net cage, and water flow from the flow guide holes directly falls to impact the bottom of the net cage to form scouring. The collection platform can prevent water flow from the diversion holes from scouring the scouring pit.

The lower part of the fish excrement collecting area is connected with a fish excrement conduit and a fish excrement funnel which are positioned above the collecting platform.

The top, the upper part and the lower part of the fish culture net cage are covered with flow baffle plates, and the edges of the flow baffle plates positioned at the top are provided with water flowing holes. The flow baffle plate is used for weakening disturbance of water flow to organisms in the net cage.

In order to further block vortexes, slow down the migration and sedimentation of silt and prevent the silt from depositing and blocking the second shrimp and shellfish culture net cage; the surfaces of the second shrimp and shellfish culture net cage facing to and facing away from the water flow direction are covered with silt baffle plates, and the silt baffle plates are provided with water flowing holes. The vortex carries silt and strikes energy consumption behind the silt hindering board along the rivers motion, hinders the board along silt and climbs and continue to dissipate the energy, and silt whereabouts subsides. Or the shrimp and shellfish culture net cage is enclosed after passing through the water flowing hole, and the energy is dissipated by biological resistance, and the silt can also settle.

And net cage supporting plates are arranged on two sides of the second shrimp and shellfish culture net cage facing to and facing away from the water flow direction. The net cage supporting plate is used for supporting the second shrimp and shellfish culture net cage. Aquatic plants such as zostera marina and the like are planted on the net cage supporting plate.

The working and arranging principle of the invention is as follows: the root of the formation of the horseshoe vortex is that the submerged water flow rotates after impacting the seabed and passes through the specific flow field environment of the scouring pit. There is the vertical motion department of rivers to set up pile foundation water conservancy diversion box around the pile foundation, dams rivers, passes through the pipeline with rivers and carries to fish culture net cage in for the transportation comes from the nutrient substance of bottom and the inside excrement of clearance culture net cage. A first shrimp and shellfish culture net cage is arranged below the pile foundation diversion box and used for culturing shrimps and shellfish to fix sand and slowly flow. Arranging a second shrimp and shellfish culture net cage and a fish culture net cage on two sides of the pile foundation; the upper part is used for culturing fishes, the lower part is used for culturing shrimps and shellfishes, and aquatic plants such as zostera marina and the like are planted on the two sides and used for maintaining the balance of nitrogen and phosphorus compounds and slowly flowing for sand fixation. The rear side has water flow climbing, at the moment, because the water flow climbs from the bottom and carries silt and nutrient substances, the water flow is guided back to the fish culture net cage at the middle rear part through the post rear guide box at the rear and is deposited again. An internal circulation field is formed, plankton or nutrient substances are provided for the fishes, and meanwhile, the fishes are intercepted in multiple layers, so that the loss of silt is slowed down.

The invention has the beneficial effects that:

compared with the prior art, the invention provides a new solution for backfilling and space utilization of the scoured pit by utilizing the special flow field in the scoured pit and combining the aquaculture net cage. The submerged water flow in the front part and the ascending water flow in the rear part of the pile foundation scouring pit are collected through the flow guide box with the shrimp and shellfish culture net cage at the bottom, and the bottom nutrient substances are conveyed into the fish culture net cage through the flow guide plate and the flow guide pipe. Meanwhile, a fish excrement collecting area is designed by utilizing water flow, excrement is cleaned in time, water in the fish culture net cage is kept clean, and internal substance circulation is formed to a certain extent. On the one hand, the formation of horseshoe vortices is reduced, and on the other hand, the residual energy is also used for mass transport.

The shrimp and shellfish culture net cage arranged at the bottom of the fish culture net cage and the aquatic plants on the net cage supporting plate are used for solidifying silt, slowing down water flow impact, intercepting water flow and silt and achieving the effect of partial back silting.

The invention gives consideration to aquaculture and scouring protection, greatly improves the added value of wind power development, respects the natural environment, and is green, environment-friendly and efficient.

Drawings

FIG. 1 is a two-dimensional schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 2 is a schematic top view of the overall structure of an embodiment of the present invention;

FIG. 3 is a schematic view showing the delivery of water, silt and nutrients inside the fish-farming cages and the second shrimp-shellfish-farming cage according to the embodiment of the present invention;

fig. 4 is a schematic top view of an internal flow field and a structure of a pile foundation diversion box according to an embodiment of the present invention;

FIG. 5 is a schematic view of a single pile foundation flow field according to an embodiment of the present invention;

the system comprises a pile foundation main body 1, a fish culture net cage 2, a post-pile guide box 3, a second shrimp and shellfish culture net cage 4, a pre-pile guide box 5, a first shrimp and shellfish culture net cage 6, a net cage support plate 7, a flow baffle 8, a flow opening 9, a flow guide opening 10, a support plate 11, a flow guide hole 12, a hard plate 13, a submerged water inlet 14, a flow guide pipe 15, a second flow guide plate 16, a first flow guide plate 17, an ascending water inlet 18, a buffer box 19, a flow guide vertical pipe 19, a fish excrement guide pipe 20, a fish excrement collection area 21, a aquatic plant 22, a collection platform 23, a silt baffle 24, a water flowing hole 25 and a silt flowing hole 26.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope covered by the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1-5, the equipment for water-blocking protection of the scoured pit and silt back-silting comprises a pile foundation main body 1, a pile foundation diversion box, a fish culture net cage 2, a first shrimp and shellfish culture net cage 6 and a second shrimp and shellfish culture net cage 4; the pile foundation diversion box comprises a box top, a box bottom, a front wall, a left side wall and a right side wall, wherein the box top is provided with a submerged water flow inlet 13, the box bottom is provided with an ascending water flow inlet 17, the front wall is provided with a diversion port 9, and the left side wall and the right side wall are provided with diversion holes 11; the submerged water inlet 13 and the ascending water inlet 17 are both one-way inlets; the pile foundation flow guiding box is divided into a pile front flow guiding box 5 and a pile rear flow guiding box 3; a vertical diversion pipe 19 and a buffer box 18 are arranged in the fish culture net cage 2; the drainage port 9 of the guide box 5 before the pile is connected with the bottom port of the guide vertical pipe 19 through the guide pipe 14, and the drainage port 9 of the guide box 3 after the pile is connected with the buffer box 18 through the guide pipe 14; the second shrimp and shellfish culture net cage 4 is in a triangular prism shape; a front pile guide box 5 is arranged on the front side of the pile foundation main body 1, a rear pile guide box 3 is arranged on the rear side of the pile foundation main body 1, and a first shrimp and shellfish culture net cage 6 is arranged below the front pile guide box 5 and the rear pile guide box 3; fish culture net cages 2 are arranged on two sides of the pile foundation main body 1, a second shrimp and shellfish culture net cage 4 is arranged below the fish culture net cages 2, and edges of the second shrimp and shellfish culture net cage 4 are perpendicular to the pile foundation main body 1; the second shrimp/shellfish culture cage 4 has a top surface and a bottom surface opposite to each other, the top surface being in contact with the bottom surface of the fish culture cage 2, and the bottom surface being inserted into the sediment. The bottom of the second shrimp and shellfish culture net cage 4 is provided with a hard plate 12 for being conveniently inserted into the sediment.

Wherein, the front side of the pile body 1 is the inflow side, such as the left side in fig. 1, 2, 4 and 5; the pile body 1 is shown on the rear side as the right side in fig. 1, 2, 4 and 5. In the specific implementation process, the flow velocity is high, the energy is high when the current flows, the deepest position of the flushing pit is arranged on the current side, a larger protection area is needed, and the volume of the post front diversion box 5 is larger than that of the post rear diversion box 3. The level of the vents 9 is generally higher than the level of the flow directing holes 11. The flow guide tube 14 is a flexible tube through which water can flow. Because whole device needs the equipment, considers the equipment convenience to the device inevitably can vibrate under water, and the hose can provide certain surplus, guarantees the reliability. The shapes of the drainage port 9, the diversion hole 11, the submerged water inlet 13 and the ascending water inlet 17 can be any shapes; in general, a circular hole is adopted to facilitate the connection of the diversion hole 11 with the diversion pipe 14, and the connection of the diversion pipe 14 with the diversion hole 11 means a sealed connection. In general, the submerged water inlet 13 and the ascending water inlet 17 have areas larger than the area of the drainage port 9, and the area of the drainage port 9 is larger than the area of the guide hole 11. The buffer box 18 is provided with an inlet and an outlet, the outlet being arranged horizontally or downwards. And a drainage port 9 of the post-pile diversion box 3 is connected with an inlet of a buffer box 18 through a diversion pipe 14, and water flows out of an outlet of the buffer box 18.

The common scouring pit is scoured comparatively seriously at front, and the topography is comparatively precipitous in the pile foundation back both sides, is unsuitable to arrange square or cylindrical box with a net. A soft mesh bag can be arranged below the front stake flow guiding box 5 to serve as a first shrimp and shellfish culture net cage 6 for culturing shrimps and shellfish and stabilizing sand and slowly flowing. And in a relatively flat area behind the pile foundation, a hard frame type net cage can be arranged as a first shrimp and shellfish culture net cage 6 for culturing shrimps and shellfish, so that sand is fixed and slow flow is realized. The two sides of the pile foundation are relatively flat areas, hard frame type net cages can be arranged to serve as a fish culture net cage 2 and a second shrimp and shellfish culture net cage 4, fish is cultured on the upper portion, shrimp and shellfish are cultured on the lower portion, aquatic plants 22 such as zostera marina and the like are planted on the two sides, and the hard frame type net cages are used for maintaining nitrogen and phosphorus balance and slowly flowing and fixing sand. Specifically, the fish culture net cage 2 can be a quadrangular shape. The specific dimensions of the fish culture net cage 2, the first shrimp and shellfish culture net cage 6 and the second shrimp and shellfish culture net cage 4 are determined according to the size of the scouring pit and the species of cultured aquatic products.

As shown in fig. 2 and 4, as a specific embodiment, a first guide plate 16 and a second guide plate 15 may be further disposed inside the pile foundation guide box of the above-mentioned apparatus, the first guide plate 16 and the second guide plate 15 are disposed at the bottom of the box, or the first guide plate 16 and the second guide plate 15 are disposed at the top of the box, two ends of the first guide plate 16 are respectively located at the left side wall and the right side wall, two ends of the second guide plate 15 are respectively located at the left side wall and the right side wall, and a distance from the first guide plate 16 to the front wall is smaller than a distance from the second guide plate 15 to the front wall; the height of the first baffle 16 and the second baffle 15 is less than the distance from the top of the cartridge to the bottom of the cartridge; at this time, the guide holes 11 are located between the first guide plate 16 and the rear wall. The first baffle 16 is slightly higher than the second baffle 15. In the specific implementation process, the first guide plate 16 and the second guide plate 15 of the pile front guide box 5 are arranged at the box bottom and are perpendicular to the box bottom. The first guide plate 16 and the second guide plate 15 of the post-pile guide box 3 are arranged on the box top and are vertical to the box top. That is, the post-pile guide box 5 and the post-pile guide box 3 may adopt different guide structures (the first guide plate 16 and the second guide plate 15).

As shown in fig. 2 and 4, as one specific embodiment, the pile foundation guide box of the above-mentioned equipment can be in the shape of a circular truncated cone, the front wall is convex, the rear wall is concave, and the bending amplitude of the front wall and the rear wall is 60-75 degrees. The front wall projects outwardly and the rear wall projects inwardly, as viewed from the exterior. The bending amplitude is 60 degrees to 75 degrees, namely, the included angle formed by the extending surfaces of the left side wall and the right side wall is 60 degrees to 75 degrees. At this time, the first air deflector 16 and the second air deflector 15 are parallel and have curved surfaces, the bending amplitude is consistent with that of the front wall or the rear wall, and the bending direction is consistent with that of the front wall or the rear wall.

As shown in fig. 1, as one specific embodiment, a support plate 10 can be horizontally arranged on the measuring side wall of the pile foundation diversion box of the device, and the support plate 10 is level with the box bottom so as to adapt to the topographic features of the scour pit to a certain extent and be used for supporting the pile foundation diversion box and the first shrimp and shellfish culture net cage 6.

As shown in fig. 3, as a specific embodiment, a fish excrement collecting area 21 is arranged at the lower part of the fish culture net cage 2 of the equipment, the fish excrement collecting area 21 is in a conical surface shape, the conical top is downward, and the conical top is open; the vertical draft tube 19 passes vertically through the fish excrement collecting area 21. The upper edge of the fish excrement collecting area 21 is contacted with the inner surface part of the fish culture net cage 2; if the fish culture net cage 2 is in a quadrangular shape, the upper edge of the fish excrement collecting area 21 is tangent to the inner surface of the fish culture net cage 2 and is fixed at the tangent point. The size of the opening of the conical top can be designed according to the size of the fish culture net cage 2 and the quantity of cultured fishes.

As shown in fig. 3, as one embodiment, a collecting platform 23 is provided in the second shrimp-shellfish culturing net cage 4 of the above-mentioned apparatus, and the collecting platform 23 is located below the fish excreta collecting area 21 and can be used for collecting fish excreta discharged from the fish excreta collecting area 21; the diversion holes 11 of the pile-front diversion box 5 guide the water flow to the collection platform 23 through the diversion pipe 14. The water outlet of the draft tube 14 is arranged on the collection platform 23, and the water flow from the draft tube 14 washes the fish excrement on the collection platform 23. Specifically, a fish excrement conduit 20 and a funnel are connected below the fish excrement collecting area 21, and the fish excrement conduit 20 and the funnel are positioned above the collecting platform 23. The fish excrement conduit 20 passes through the connecting surface of the second shrimp and shellfish culture net cage 4 and the fish culture net cage 2, and the funnel is positioned in the second shrimp and shellfish culture net cage 4.

As shown in figures 1 and 3, as one embodiment, the fish culture net cage 2 of the above-mentioned equipment is covered with flow baffles 8 at the top, upper and lower parts, and the edges of the flow baffles 8 at the top are provided with water flow holes 25. The surfaces facing to and facing away from the water flow direction of the second shrimp and shellfish culture net cage 4 are covered with a silt baffle plate 24, and the silt baffle plate 24 is provided with a water flowing hole 25 and a sand flowing hole 26. The net cage support plates 10 are arranged on two sides of the second shrimp and shellfish culture net cage 4 facing to and facing away from the water flow direction. Aquatic plants 22 such as zostera marina are planted on the net cage support plate 10.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. The utility model provides a erode protection of stopping water of hole and silt back-silting equipment which characterized in that includes:

a pile foundation main body;

2. The equipment of claim 1, wherein the pile foundation diversion box is internally provided with a first diversion plate and a second diversion plate, the first diversion plate and the second diversion plate are arranged at the bottom or the top of the box, two ends of the first diversion plate are respectively positioned at the left side wall and the right side wall, two ends of the second diversion plate are respectively positioned at the left side wall and the right side wall, and the distance from the first diversion plate to the front wall is smaller than that from the second diversion plate to the front wall; the height of the first baffle and the second baffle is less than the distance from the top of the box to the bottom of the box.

3. The apparatus of claim 2, wherein the first baffle is higher than the second baffle.

4. The apparatus of claim 1, wherein the pile foundation box is in the shape of a circular truncated cone, the front wall is convex, the rear wall is concave, and the front wall and the rear wall are both curved at an angle of 60 ° to 75 °.

5. The device as claimed in claim 1, 2 or 4, wherein a fish excrement collecting area is arranged at the lower part of the fish culture net cage, the fish excrement collecting area is in the shape of a conical surface, the conical top is downward, and the conical top is open; the vertical diversion pipe vertically penetrates through the fish excrement collecting area.

6. The apparatus of claim 1, 2 or 4, wherein a collection platform is arranged in the second shrimp-shellfish culture cage, and the collection platform is positioned below the fish excrement collection area; the diversion holes of the pile-leading diversion box guide the water flow to the collection platform.

7. The apparatus of claim 6, wherein a fish excreta conduit and funnel is connected below the fish excreta collection zone, and the fish excreta conduit and funnel are located above the collection platform.

8. The apparatus as claimed in claim 7, wherein the top, upper and lower parts of the fish farming cage are covered with flow baffles, and the edges of the flow baffles at the top are provided with water flowing holes.

9. The apparatus as claimed in claim 1, 2 or 4, wherein the surfaces of the second shrimp and shellfish culture net cage facing to and facing away from the water flow direction are covered with silt obstructing plates, and the silt obstructing plates are provided with water flow holes and sand flow holes.

10. The apparatus as claimed in claim 1, 2 or 4, wherein the second shrimp shellfish culture cage is provided with cage support plates on both sides facing the water flow direction and facing away from the water flow direction.