Method for planting underwater sewage suction plants in offshore area and benthic lattice device

Abstract

The invention relates to a method for planting underwater sewage suction plants in an offshore area and a benthic grid device, and relates to the technical field of underwater planting, the benthic grid device comprises an upper layer net and a bottom layer net, the upper layer net is provided with a connecting rod, the connecting rod is connected with the bottom layer net, the connecting rod is inserted into the seabed, the upper layer net is provided with a cloth bag, and matrix soil is arranged in the cloth bag. The method has the effects of reducing the possibility that the aquatic plants are washed away by ocean current and improving the planting survival rate.

Description

Technical Field

[0001] The invention relates to the technical field of underwater planting, and in particular to a method for planting underwater sewage-absorbing plants in nearshore waters and a bottom-dwelling grid device. Background Art

[0002] At present, with the increasing impact of human activities, the marine ecological environment has suffered serious damage, among which the degradation of seagrass beds is particularly obvious. As an important primary producer, seagrass plays an irreplaceable role in maintaining marine biodiversity. Therefore, restoring damaged seagrass beds has become one of the important measures to protect the marine ecosystem.

[0003] In order to cope with the difficulties in the process of seagrass bed restoration, the existing commonly used method is mainly to sow seagrass. First, the seabed surface of the area where the seagrass bed needs to be restored is turned over, and then the collected or cultivated seagrass seeds are evenly scattered on the turned over seabed surface, waiting for the seagrass to take root and sprout to complete the restoration of the seagrass bed. However, after the sowing is completed, the turned over seabed surface is relatively loose. When facing the impact of strong ocean currents, the turned over soil and the seagrass seeds sown in the soil are easily washed away, resulting in a low survival rate of aquatic grass planting. Summary of the invention

[0004] In order to reduce the possibility of seaweed being washed away by ocean currents and improve the survival rate of the plants, the present application provides a method for planting underwater sewage-absorbing plants in nearshore waters and a benthic grid device.

[0005] The present application provides a method for planting underwater sewage-absorbing plants in nearshore waters and a benthic grid device using the following technical solutions: A method for planting underwater sewage-absorbing plants in nearshore waters and a benthic grid device, comprising an upper net and a bottom net, wherein the upper net is provided with a connecting rod connected to the bottom net and inserted into the seabed, and the upper net is provided with a cloth bag containing matrix soil.

[0006] By adopting the above technical solution, the bottom net and the upper net are connected by a connecting rod. Welding or other methods can be used to connect and fix the bottom net and the upper net through the connecting rod, and the bottom of the cloth bag in the mesh of the upper net is inserted into the mesh of the bottom net. The cloth bag is filled with the configured matrix soil, and the matrix soil is rich in a large amount of nutrients required for the growth of seaweed. When it is necessary to plant seaweed on the seabed, first clean up and level the seabed surface where the seaweed needs to be planted. It is best to dig a pit for placing the benthic grid device, and then put the benthic grid device into the pit, and insert the connecting rod into the seabed plane to fix it to complete the planting. By setting the bottom net and the upper net, a stable environment is constructed for seaweed to take root. During germination, the connecting rod is inserted into the seabed to reduce the possibility of the whole device being washed away by the ocean current. The bottom net and the upper net improve the overall stability, thereby reducing the possibility of seagrass seeds being washed away by the ocean current. At the same time, in order to further improve the survival rate of seagrass, the seagrass seeds can be planted in the cloth bag matrix soil before the seabed installation, and a suitable environment is provided to wait for the seagrass to take root and germinate, and then the whole benthic grid device is installed on the seabed, so that through the development and growth of the seagrass's own root system, the possibility of seagrass being washed away by the ocean current is further reduced, and the survival rate of the planting is improved. The cloth bag is made of degradable material. After a long time, the cloth bag is degraded in the seabed soil, so that the matrix soil and the seabed soil are mixed into one.

[0007] Preferably, the upper net is provided with a peripheral net, the peripheral net surrounds the upper net, the peripheral net is connected to the bottom net, and the peripheral net surrounds the bottom net.

[0008] By adopting the above technical solution, the outer net surrounds the upper net and the bottom net. On the one hand, the outer net connects the upper net and the bottom net, which improves the stability of the connection between the upper net and the bottom net and reduces the possibility of the upper net collapsing during use, so as to improve the overall strength and stability of the benthic grid device. At the same time, the outer net is set to reduce the possibility of large impurities on the seabed rushing into the upper net and the bottom net from the side and damaging the bags and the seaweed planted in the bags, thereby improving the planting inventory rate.

[0009] Preferably, a connecting assembly is provided between the connecting rod and the cloth bag, the connecting assembly is used to connect the cloth bag and the connecting rod, the connecting assembly comprises a connecting block and a connecting cloth strip, the connecting block is arranged on the connecting rod, the connecting cloth strip is arranged on the cloth bag, and the connecting block is connected to the connecting cloth strip.

[0010] By adopting the above technical solution, the connecting cloth strips and the connecting blocks are connected and fixed together by integral molding or other means, so that the cloth bag and the connecting rod are connected together to improve the stability of the installation and fixation of the cloth bag. At the same time, the connecting rod penetrates the area between the upper net and the bottom net in the height direction. Through the connection between the connecting rod and the cloth bag, the space inside the cloth bag is expanded in the height direction, which makes it convenient to fill the substrate soil into the cloth bag and also makes it convenient for the cloth bag to fill the regional space between the upper net and the bottom net, thereby improving the overall strength and stability of the benthic grid device, reducing the possibility of ocean currents washing away water, soil and seaweed, and improving the survival rate of the planting.

[0011] Preferably, the connecting assembly further comprises a connecting rope and a connecting buckle, the connecting cloth strip is provided with a connecting hole, the connecting rope passes through the connecting hole, the connecting buckle is arranged on the connecting rope, and the connecting buckle buckles the upper net or the bottom net.

[0012] By adopting the above technical scheme, the ring body of the connecting buckle part is rotatably connected, so that the connecting buckle can be buckled and disassembled to release the buckle at the same time. If the connecting cloth strip is directly fixed on the connecting block, it is necessary to insert the connecting cloth strip into the molding material when the connecting block is formed. Although this connection is stable and reliable, it is difficult to separate, which is not convenient for actual use. By arranging connected connecting ropes and connecting buckles on the side walls of the connecting block, the connecting buckles and the connecting ropes pass through the connecting holes on the connecting cloth strips, and are buckled on the mesh wires of the upper net or the bottom net through the connecting buckles, the connecting cloth strips and the connecting block are connected together, and the connecting block is connected to the mesh wires of the upper net or the bottom net together, thereby further improving the stability of the connection of the overall device and facilitating the connection and disassembly of the connecting block and the connecting cloth strip. After problems such as holes in the cloth bag occur, the cloth bag can be taken out of the overall device for replacement after the connecting block and the connecting cloth strip are disassembled, which is convenient for use.

[0013] Preferably, the connecting cloth strip is provided with an auxiliary ring, the auxiliary ring is arranged in the connecting hole, and the connecting rope and the connecting ring buckle pass through the auxiliary ring.

[0014] By adopting the above technical solution, an auxiliary ring is fixedly arranged on the inner wall of the connecting hole, and the auxiliary ring can be against the connecting rope, so as to improve the strength of the connecting cloth strip at the connecting hole, reduce the possibility of the connecting rope rubbing against the inner wall of the connecting hole and thus damaging the connecting cloth strip during use, reduce the probability of the cloth bag and the connecting block being separated after the connecting cloth strip is damaged, improve the stability and durability of the connection between the connecting cloth strip and the connecting block, and then improve the stability of the fixation between the cloth bag and the connecting rod, reduce the possibility of the ocean current washing away the cloth bag and aquatic plants, and thus improve the survival rate of aquatic plant planting.

[0015] Preferably, the connecting rod is provided with a mounting groove, a mounting block is inserted in the mounting groove, the connecting rod is provided with a connecting groove communicating with the mounting groove, the connecting block is connected to the mounting block, and the connecting block passes through the connecting groove.

[0016] By adopting the above technical solution, the mounting block is connected to the connecting block, and the mounting block is inserted into the mounting groove of the connecting rod, so that the connecting block passes through the connecting groove of the connecting rod. On the one hand, the inner wall of the connecting groove presses against the connecting block to limit the connecting block, and on the other hand, both the mounting block and the connecting block can be removed from the connecting rod, thereby facilitating the assembly and disassembly of the benthic grid device, and facilitating the disassembly for repair and replacement when problems occur with the connecting block.

[0017] Preferably, the connecting rod is provided with an assembly groove communicated with the installation groove, an assembly block is inserted in the assembly groove, the assembly block abuts against the installation block, and the assembly block is threadedly connected to the assembly groove.

[0018] By adopting the above technical solution, the assembly block is inserted into the assembly groove and threadedly connected to the assembly groove. On the one hand, the assembly block is pressed against the mounting block to limit the mounting block, reducing the possibility of displacement of the mounting block during use, thereby improving the stability of the bag installation to reduce the possibility of the bag or the seaweed inside the bag being washed away by the current. On the other hand, the assembly block is threadedly connected to the assembly groove, thereby performing a certain sealing treatment on the inside of the mounting groove, reducing the possibility of impurities and foreign matter entering the mounting groove to corrode and damage the inner wall of the mounting groove and the mounting block, thereby improving durability.

[0019] Preferably, the assembly block is provided with an auxiliary block, the mounting block is provided with an auxiliary groove, the auxiliary block is inserted into the auxiliary groove and is threadedly connected with the auxiliary groove.

[0020] By adopting the above technical solution, the assembly block is inserted into the assembly groove while the auxiliary block is inserted into the auxiliary groove. When the assembly block is rotated so that the assembly block is threadedly connected to the assembly groove, the auxiliary block rotates synchronously with the assembly block and is threadedly connected to the assembly groove, thereby improving the stability of the connection between the assembly block and the mounting block, reducing the possibility of movement and shaking of the mounting block, and improving the stability of the overall structure.

[0021] Preferably, the assembly block is provided with an assembly ring block, the assembly groove is connected to the connecting groove, the connecting block is provided with an assembly ring groove, and the assembly ring block is inserted into the assembly ring groove and can rotate in the assembly ring groove.

[0022] By adopting the above technical solution, the assembly ring block at the bottom of the assembly block is inserted into the assembly ring groove on the connecting block, thereby limiting the connecting block and reducing the possibility of shaking and moving of the connecting block and the connected cloth bag, thereby improving the stability of the connection and fixation between the connecting block and the connecting rod, thereby reducing the possibility of shaking of the cloth bag due to ocean current impact during use, thereby improving the stability of seaweed growth and improving the survival rate of planting.

[0023] A method for planting underwater sewage-absorbing plants in nearshore waters, comprising the following steps: Step 1: Assemble the benthic grid device and plant seagrass seeds into the bag substrate soil; Step 2: Locate the seagrass beds to be restored, clean up trash and debris, and level the bottom; Step 3: Place the benthic grid device on the seabed and insert the connecting rod into the seabed to fix it.

[0024] By adopting the above technical solution, the upper net, the lower net and the connecting rod are assembled together, and the cloth bag is filled with matrix soil and seaweed seeds are planted in the matrix soil. The seaweed seeds can be cultivated for a period of time to wait for the seaweed seeds to take root and germinate, or the benthic grid device can be immediately installed on the seabed to wait for the seaweed seeds to grow on the seabed. After that, the location of the seaweed bed to be repaired is determined, and the seabed in the corresponding area is cleaned and leveled, waiting for installation. In order to improve stability, pit digging operations can be carried out on the seabed in the corresponding area to dig pits to accommodate the benthic grid device to be installed, thereby reducing the area of ​​the benthic grid device impacted by the seabed current to reduce the impact of the sea current impact. The benthic grid device is subsequently installed, and the connecting rod is inserted into the seabed for fixing, and the planting can be completed. If the seaweed has been cultivated and rooted before, the planting survival rate can reach a very high level, that is, the seaweed can be installed and planted in the form of seeds, and the overall strength can be improved through the overall structure of the upper net and the bottom net, thereby sharing the impact of the sea current on the cloth bag and the matrix soil in the cloth bag to a considerable extent, thereby reducing the possibility of the sea current washing away the seaweed and the matrix soil, so as to improve the planting survival rate.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. An upper net, a bottom net, a connecting rod, a cloth bag, a matrix soil, a peripheral net and a connecting assembly are provided. The connecting rod connects the upper net and the bottom net, and the peripheral net surrounds and connects the upper net and the bottom net, thereby improving the strength of the overall device. At the same time, the cloth bag is connected to the connecting rod through the connecting assembly, and the cloth bag is located between the upper net and the bottom net. Seaweed is cultivated through the matrix soil of the cloth bag, and the connecting rod is inserted into the seabed and fixed, thereby fixing the overall device on the seabed. The peripheral net cooperates with the upper net and the bottom net to reduce the impact of the ocean current, reduce the possibility of the cloth bag or the matrix soil inside the cloth bag being washed away by the ocean current, and thus reduce the possibility of the seaweed being washed away, thereby improving the survival rate of seaweed planting; 2. By providing a connecting cloth strip, a connecting block, a connecting rope, a connecting ring buckle, a connecting hole and an auxiliary ring, the connecting block allows the connecting rope to pass through the connecting cloth strip, and the connecting ring buckle is installed on the connecting rope by a rope knot or other means and the connecting ring buckle is buckled on the upper net or the lower net, so that the connecting cloth strip of the cloth bag is connected with the connecting block, thereby improving the stability of the connection and fixation between the connecting block and the upper net or the lower net, and the auxiliary ring is used to reduce the wear of the connecting rope on the connecting cloth strip to improve durability, thereby improving the stability and durability of the overall structural connection, and at the same time facilitating disassembly, thereby improving the convenience of replacing the cloth bag when it is broken; 3. By setting a mounting block, a mounting groove, a connecting groove, an assembly block, an assembly groove, an auxiliary block and an auxiliary groove, the connecting block is set on the mounting block, the mounting block is inserted into the mounting groove of the connecting rod, and the connecting block is inserted into the connecting groove, so that the connecting block is installed on the connecting rod, and then the assembly block is inserted into the assembly groove, so that the auxiliary block on the assembly block is inserted into the auxiliary groove on the mounting block, and the assembly block is rotated and tightened, so as to thread the assembly block and the assembly groove and the auxiliary block and the auxiliary groove, so as to limit and fix the mounting block, and at the same time, the connecting block is synchronously limited and fixed, so as to reduce the possibility of shaking and moving of the connecting block during use, and at the same time, the connecting block can be detachably installed on the connecting rod, so as to facilitate the replacement of the connecting block when it is broken, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of a benthic grid device for planting underwater sewage-absorbing plants in nearshore waters provided in an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view used to show the internal structure of the connecting rod.

[0028] Figure 3 It is a cross-sectional view used to reflect the connection relationship between the connecting block and the assembly block.

[0029] Explanation of the reference numerals: 1. upper net; 11. bottom net; 12. outer net; 13. clamping rod; 2. connecting rod; 21. mounting groove; 22. connecting groove; 23. assembly groove; 24. mounting ring groove; 3. cloth bag; 4. connecting assembly; 41. connecting cloth strip; 411. connecting hole; 412. auxiliary ring; 42. connecting block; 421. assembly ring groove; 43. connecting rope; 44. connecting buckle; 5. mounting block; 51. auxiliary groove; 6. assembly block; 61. auxiliary block; 62. assembly ring block. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] The present application embodiment discloses a device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters. Figures 1 to 3 , which includes a cloth bag 3, an upper net 1 and a bottom net 11. The upper net 1 is welded with a connecting rod 2 that runs through the nodes of the upper net 1. The connecting rod 2 is welded and connected to the nodes of the bottom net 11 and runs through the nodes of the bottom net 11. The part of the connecting rod 2 located below the bottom net 11 is inserted into the seabed. The cloth bag 3 is arranged between the upper net 1 and the bottom net 11 and at the mesh of the upper net 1 and the bottom net 11. The cloth bag 3 can be filled with matrix soil to plant seaweed. A connecting component 4 is arranged between the connecting rod 2 and the cloth bag 3, and the connecting component 4 is used to connect the cloth bag 3 and the connecting rod 2. A peripheral net 12 is fixedly arranged around the outer periphery of the upper net 1, and the peripheral net 12 is fixedly connected to the side wall of the bottom net 11 and arranged around the bottom net 11. The cloth bag 3 used is made of degradable material. The upper net 1, the bottom net 11 cooperate with the outer net 12 to form a benthic grid device under the connection of the connecting rod 2, and can be inserted into the seabed with the connecting rod 2 and installed on the seabed, and the degradable cloth bag 3 is installed through the connecting component 4, and the seabed is planted in the matrix soil of the cloth bag 3. The overall structure of the benthic grid device resists and shares the impact of the ocean current, thereby reducing the possibility of the seabed being washed away and improving the survival rate of the plants.

[0032] For ease of use, refer to Figure 2 and Figure 3 The connection assembly 4 includes a connection block 42, a connection cloth strip 41, a connection rope 43 and a connection buckle 44. The connection cloth strip 41 is fixedly arranged on the outer wall of the cloth bag 3 near the four edges and corners. The two connection cloth strips 41 wrap the outer wall corners of the cloth bag 3 from both sides. The top wall of the connecting rod 2 is provided with a mounting groove 21, and the mounting block 5 is inserted into the mounting groove 21. The side wall of the connecting rod 2 is provided with a connecting groove 22 that communicates with the mounting groove 21, and the connecting groove 22 communicates with the top wall of the connecting rod 2. The connecting block 42 is fixedly arranged on the mounting block 5 and is adapted to pass through the connecting groove 22 and be inserted into the mounting groove 21. The connecting rope 43 is fixedly arranged on the side wall of the connecting block 42, the connecting cloth strip 41 is penetrated with a connecting hole 411, an auxiliary ring 412 is fixedly arranged on the inner wall of the connecting hole 411, the connecting rope 43 passes through the auxiliary ring 412 and the connecting hole 411, the connecting ring buckle 44 is fixedly arranged on the connecting rope 43 by a knot or other means, a clamping rod 13 is fixedly arranged on the mesh line of the upper net 1, and the connecting ring buckle 44 is buckled on the mesh line and the clamping rod 13 of the upper net 1. In another embodiment, the connecting ring buckle 44 on part of the connecting rope 43 is buckled on the clamping rod 13 set on the mesh line of the bottom net 11 to improve the stability of the fixing of the cloth bag 3. The connecting rope 43 can be connected to the mesh line of the upper net 1 through the connecting ring buckle 44, so that the connecting cloth strip 41 is limited by the connecting hole 411, which is convenient for the connection and installation of the cloth bag 3, and also convenient for disassembly and replacement, thereby improving the convenience of use.

[0033] In order to further improve the survival rate of implants, refer to Figure 2 and Figure 3The top wall of the connecting rod 2 is provided with a circular assembly groove 23 which is in communication with the mounting groove 21. An assembly block 6 is inserted into the assembly groove 23. The bottom wall of the assembly block 6 abuts against the top wall of the mounting block 5. The top wall of the assembly block 6 is flush with the top wall of the connecting rod 2. The assembly block 6 is threadedly connected with the assembly groove 23. The top wall of the mounting block 5 is provided with a circular auxiliary groove 51. The bottom wall of the assembly block 6 is fixedly provided with a circular auxiliary block 61. The auxiliary block 61 is inserted into the auxiliary groove 51 and is threadedly connected with the auxiliary groove 51. An assembly ring block 62 is fixedly provided on the bottom wall of the assembly block 6. The outer wall of the assembly ring block 62 is flush with the outer wall of the assembly block 6. The top wall of the connecting block 42 is provided with an assembly ring groove 421. The assembly ring block 62 is inserted into the assembly ring groove 421 and can slide in the assembly ring groove 421. The bottom wall of the assembly groove 23 is provided with an installation ring groove 24 which connects the connecting groove 22 and the assembly ring groove 421. The assembly ring block 62 is inserted into the installation ring groove 24 and can slide and rotate in the installation ring groove 24. In some application scenarios, in order to reduce the materials used and reduce the weight, the connecting rod 2 can be a hollow pipe, and the hollow pipe of the connecting rod 2 is the interconnected installation groove 21 and the assembly groove 23. At the same time, the size of the mounting block 5 is smaller than the area of ​​the installation groove 21 vacated in the middle of the connecting rod 2. At this time, the auxiliary block 61 is adapted to be inserted into the auxiliary groove 51 and threadedly connected with the auxiliary groove 51, and the assembly ring block 62 is adapted to be inserted into the assembly ring groove 421. The assembly block 6 inserted into the assembly groove 23 can be adapted to limit the mounting block 5 and the connecting block 42 on the mounting block 5, thereby improving the stability of the installation and fixation of the mounting block 5 and the connecting block 42, thereby improving the stability of the installation and connection of the cloth bag 3, reducing the possibility of the cloth bag 3 and seaweed being washed away by the current impact, and improving the survival rate of the seaweed.

[0034] A method for planting underwater sewage-absorbing plants in nearshore waters, comprising the following steps: Step 1: Assemble the benthic grid device, fill the substrate soil rich in nutrients into the assembled cloth bag 3 in the benthic grid device, and plant the seaweed seeds in the substrate soil to provide a suitable environment for the seaweed to take root and germinate; Step 2: Determine the location of the seagrass bed to be repaired, clean up the garbage and debris on the seabed, level the bottom, and dig a pit. The pit specification is slightly larger than the benthic grid device specification, and the pit depth is slightly larger than the distance between the upper net 1 and the bottom net 11 of the benthic grid device; Step 3: insert the assembled benthic grid device planted with rooted seaweed into the dug pit, and insert the benthic grid device connecting rod 2 into the seaweed for fixation, and then fill some seabed soil on the surface of the benthic grid device.

[0035] By following the above steps, seagrass can be planted on the seabed, so that the most vulnerable rooting period of seagrass takes place in the benthic grid device. The benthic grid device is then fixed to the seabed, thereby reducing the possibility of the seagrass being washed away by the ocean current and improving the survival rate of the planting.

[0036] The implementation principle of the method for planting underwater sewage-absorbing plants in nearshore waters and the benthic grid device in the embodiment of the present application is as follows: the benthic grid device is constructed by cooperating with the upper net 1 and the bottom net 11 with the connecting rod 2 to form a relatively stable space, and the cloth bag 3 is installed and arranged in the space through the connecting component 4, and the cloth bag 3 is fixed as a whole between the upper net 1 and the bottom net 11. Seaweed is cultivated in the cloth bag 3 through the matrix soil rich in nutrients, and after the seaweed takes root and sprouts and has a certain resistance to the impact of the ocean current, the benthic grid device is installed as a whole on the seabed, and the benthic grid device is used to resist and share the impact of the ocean current, thereby reducing the possibility of the seaweed being washed away and improving the survival rate of the planting. At the same time, the cloth bag 3 is made of degradable material to reduce pollution to the environment.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters, characterized in that: The invention comprises an upper net (1) and a bottom net (11), wherein the upper net (1) is provided with a connecting rod (2), wherein the connecting rod (2) is connected to the bottom net (11), and wherein the connecting rod (2) is inserted into the seabed; and the upper net (1) is provided with a cloth bag (3), wherein the cloth bag (3) contains matrix soil.

2. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 1, characterized in that: The upper network (1) is provided with a peripheral network (12), the peripheral network (12) surrounds the upper network (1), the peripheral network (12) is connected to the bottom network (11), and the peripheral network (12) surrounds the bottom network (11).

3. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 1 is characterized by: A connecting assembly (4) is provided between the connecting rod (2) and the cloth bag (3), the connecting assembly (4) being used to connect the cloth bag (3) and the connecting rod (2), the connecting assembly (4) comprising a connecting block (42) and a connecting cloth strip (41), the connecting block (42) being provided on the connecting rod (2), the connecting cloth strip (41) being provided on the cloth bag (3), and the connecting block (42) being connected to the connecting cloth strip (41).

4. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 3 is characterized by: The connection assembly (4) further comprises a connection rope (43) and a connection buckle (44); the connection cloth strip (41) is provided with a connection hole (411); the connection rope (43) passes through the connection hole (411); the connection buckle (44) is provided on the connection rope (43); and the connection buckle (44) buckles the upper net (1) or the bottom net (11).

5. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 4, characterized in that: The connecting cloth strip (41) is provided with an auxiliary ring (412), the auxiliary ring (412) is arranged in the connecting hole (411), and the connecting rope (43) and the connecting ring buckle (44) pass through the auxiliary ring (412).

6. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 3, characterized in that: The connecting rod (2) is provided with a mounting groove (21), a mounting block (5) is inserted into the mounting groove (21), the connecting rod (2) is provided with a connecting groove (22) communicating with the mounting groove (21), the connecting block (42) is connected to the mounting block (5), and the connecting block (42) passes through the connecting groove (22).

7. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 6, characterized in that: The connecting rod (2) is provided with an assembly groove (23) communicating with the installation groove (21), an assembly block (6) is inserted into the assembly groove (23), the assembly block (6) abuts against the installation block (5), and the assembly block (6) is threadedly connected to the assembly groove (23).

8. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 7, characterized in that: The assembly block (6) is provided with an auxiliary block (61), the mounting block (5) is provided with an auxiliary groove (51), and the auxiliary block (61) is inserted into the auxiliary groove (51) and is threadedly connected to the auxiliary groove (51).

9. The device for constructing a bottom-dwelling grid for underwater sewage-absorbing plants in nearshore waters according to claim 7, characterized in that: The assembly block (6) is provided with an assembly ring block (62), the assembly groove (23) is connected to the connection groove (22), the connection block (42) is provided with an assembly ring groove (421), and the assembly ring block (62) is inserted into the assembly ring groove (421) and can rotate in the assembly ring groove (421).

10. A method for planting a bottom-dwelling grid device for underwater sewage-absorbing plants in nearshore waters according to claim 1, characterized in that: The following steps are involved: Step 1: Assemble the benthic grid device and plant seaweed seeds into the substrate soil of the cloth bag (3); Step 2: Locate the seagrass beds to be restored, clean up trash and debris, and level the bottom; Step 3: Place the benthic grid device on the seabed and insert the connecting rod (2) into the seabed for fixing.

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