A fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project

Abstract

The present invention provides a fish escape prevention device applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project, belonging to the technical field of fish escape prevention devices, including the assembly of the fish passage device, the assembly of the fish blocking device, the usage method of the fish escape prevention device, and the device maintenance. The fish passage device consists of a steel frame and a support frame to form the main structure. Steel rings are fixedly welded on the steel frame to form fish passage holes. Support columns and steel balls are provided at the lower end of the fish passage device. The fish blocking device consists of an electric grid, connecting wires, and a high-frequency pulse voltage transformer. The main structure composed of the steel frame and the support columns makes the fish passage device highly stable. The design of the fish passage holes enables the fish staying near the water discharge sluice to freely enter the main canal. The support columns and steel balls at the lower ends of the fish passage device and the fish blocking device enable the device to unload part of the water flow impact force, increasing the stability of the device. The electric grid and the high-frequency pulse voltage transformer can keep the fish away from the fish blocking device and the fish passage device. Device maintenance increases the service life of the device.

Description

Technical Field

[0001] The present invention provides a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project, belonging to the field of fish escape prevention methods. Background Art

[0002] At present, the ecological system of the middle route main canal of the South-to-North Water Diversion Project is in the initial stage of formation, and the ecological balance has not been established yet, and abnormal ecological phenomena occur from time to time. Through continuous investigation and monitoring, it is found that the fish community structure in the canal is relatively single in the fish resources survey. The management department of the Danjiangkou Reservoir area has installed fish screens at the entrance of the main canal, so that fewer fish enter the main canal and mainly small fish, and the occurrence frequency of other fish is low, and the species diversity is low. In order to improve fish diversity, fish such as silver carp, bighead carp and grass carp are artificially stocked. In order to meet the requirements, it is necessary to ensure that a certain number of fish are retained in the water conveyance main canal as markers. Therefore, how to provide a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project to solve the problem of fish escape in the water discharge sluice of the middle route of the South-to-North Water Diversion Project has become a technical problem to be solved by those skilled in the art. Summary of the Invention

[0003] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project to solve the problem of fish escape in the water discharge sluice of the middle route of the South-to-North Water Diversion Project.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project, comprising the following steps:

[0006] 1) Assembly of the fish passage device: The fish passage device consists of a steel frame and a support frame to form a main structure. Steel rings are fixedly welded on the steel frame to form fish passages. Fish sleeves are fixedly installed in the fish passages by means of cable ties. Support columns and steel balls are provided at the lower end of the fish passage device.

[0007] 2) Assembly of the fish barrier device: The fish barrier device consists of an electric grid, connecting wires and a high-frequency pulse voltage transformer. One end of the connecting wire is fixedly connected to the electric grid, and the other end is fixedly connected to the high-frequency pulse voltage transformer. Support columns and steel balls are provided at the lower end of the fish barrier device.

[0008] 3) Method of using the fish escape prevention device: When the high-frequency pulse voltage transformer is turned off, the fish blocking device will not function, and fish can enter the main canal through the fish passage hole composed of the fish passage sleeve and the steel ring. However, due to the effect of the flexible plastic strip, fish cannot enter the water release sluice through the fish passage hole. Before the water release sluice discharges water, turn on the high-frequency pulse voltage transformer. Due to the existence of the electric grid, fish will stay away from the fish passage device and the fish blocking device. The support columns and steel balls will unload the impact of the water flow and maintain the stability of the device. Fish will not enter the water release sluice through the fish blocking device and the fish passage device, thus solving the problem of fish escaping in the water release sluice of the main water conveyance canal of the Middle Route of the South-to-North Water Diversion Project.

[0009] 4) Device maintenance: The support columns and steel balls need to be maintained every 30 days to prevent corrosion. The electric grid and the high-frequency pulse voltage transformer need to be detected daily and should be in the off state during non-use periods.

[0010] In step 1) of the present invention, the steel frame is made of stainless steel to avoid rust due to immersion and affect the use.

[0011] In step 1) of the present invention, the fish passage sleeve is composed of a ring and a flexible plastic strip, enabling fish to leave the water release sluice and enter the main canal. Due to the effect of the flexible plastic strip, fish cannot freely enter and exit the water release sluice.

[0012] In step 2) of the present invention, the electric grid is composed of crossed energized wires with a pore size of 15 cm, which can meet the normal passage of fish when not energized.

[0013] In step 2) of the present invention, the high-frequency pulse voltage transformer can release high-frequency pulsed electricity to make fish stay away from the fish blocking device and the fish passage device.

[0014] In steps 1 and 2) of the present invention, the support columns are of a hollow steel pipe structure, with one end fixedly connected to the steel frame by welding and the other end inserted into the soil.

[0015] In steps 1 and 2) of the present invention, the steel balls are of a hollow structure, movably connected to the support columns, and can rotate under the action of water flow, having the function of unloading force.

[0016] Beneficial effects

[0017] A fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project includes the assembly of the fish passage device, the assembly of the fish barrier device, the usage method of the fish escape prevention device, and the device maintenance. The fish passage device consists of a steel frame and a support frame as the main structure. Steel rings are fixedly welded to the steel frame to form fish passage holes. At the lower end of the fish passage device, there are support columns and steel balls. The fish barrier device consists of an electric grid, connecting wires, and a high-frequency pulse voltage transformer. One end of the connecting wire is fixedly connected to the electric grid, and the other end is fixedly connected to the high-frequency pulse voltage transformer. The main structure composed of the steel frame and the support columns makes the fish passage device highly stable. The design of the fish passage holes enables the fish staying near the water discharge sluice to freely enter the main canal. The support columns and steel balls at the lower ends of the fish passage device and the fish barrier device can unload part of the water flow impact force, increasing the stability of the device. The electric grid and the high-frequency pulse voltage transformer can keep the fish away from the fish barrier device and the fish passage device. Device maintenance increases the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic structural diagram of the fish passage device for a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project;

[0019] Figure 2 FIG. is a schematic structural diagram of the fish barrier device for a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project;

[0020] Figure 3 FIG. is a schematic structural diagram of the fish passage sleeve for a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project;

[0021] Figure 4 FIG. is a schematic side structural diagram of the fish passage device for a fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project;

[0022] Wherein, 1. Steel frame, 2. Support frame, 3. Steel ring, 4. Fish passage hole, 5. Support column, 6. Steel ball, 7. Electric grid, 8. Connecting wire, 9. High-frequency pulse voltage transformer, 10. Ring, 11. Flexible plastic strip, 12. Fish passage sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following provides embodiments in conjunction with the drawings and specifically describes the present invention. The disclosed embodiments can be considered illustrative in all aspects and are not restrictive. The scope of the present invention is not limited by the description of the following embodiments, but only by the scope of the claims, and includes all modifications having the same meaning as the scope of the claims and within the scope of the claims.

[0024] A fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project includes the following steps:

[0025] 1) Assembly of fish passage device: The fish passage device consists of a steel frame 1 and a support frame 2 to form the main structure. A steel ring 3 is fixedly welded to the steel frame 1 to form a fish passage hole 4. A fish passage sleeve 12 is fixedly installed in the fish passage hole 4 by means of cable ties. Support columns 5 and steel balls 6 are provided at the lower end of the fish passage device.

[0026] 2) Assembly of fish barrier device: The fish barrier device consists of an electric grid 7, connecting wires 8 and a high-frequency pulse voltage transformer 9. One end of the connecting wire 8 is fixedly connected to the electric grid 7, and the other end is fixedly connected to the high-frequency pulse voltage transformer 9. Support columns 5 and steel balls 6 are provided at the lower end of the fish barrier device.

[0027] 3) Usage method of fish escape prevention device: When the high-frequency pulse voltage transformer 9 is turned off, the fish barrier device will not function, and fish can enter the main canal through the fish passage hole 4 composed of the fish passage sleeve 12 and the steel ring 3. However, due to the effect of the flexible plastic strip 11, fish cannot enter the drainage sluice through the fish passage hole 4. Before the drainage sluice discharges water, turn on the high-frequency pulse voltage transformer 9. Due to the existence of the electric grid 7, fish will stay away from the fish passage device and the fish barrier device. The support columns 5 and steel balls 6 will unload the impact of the water flow and maintain the stability of the device. Fish will not enter the drainage sluice through the fish barrier device and the fish passage device, thus solving the problem of fish escaping in the drainage sluice of the main water conveyance canal of the middle route of the South-to-North Water Diversion Project.

[0028] 4) Device maintenance: It is necessary to maintain the support columns 5 and steel balls 6 every 30 days to prevent corrosion. The electric grid 7 and the high-frequency pulse voltage transformer 9 need to be detected daily and should be in the off state during non-use periods.

[0029] In step 1) of the present invention, the steel frame 1 is made of stainless steel to avoid rust due to immersion and affect the use.

[0030] In step 1) of the present invention, the fish passage sleeve 12 is composed of a ring 10 and a flexible plastic strip 11, enabling fish to leave the drainage sluice and enter the main canal. Due to the effect of the flexible plastic strip 11, fish cannot freely enter and exit the drainage sluice.

[0031] In step 2) of the present invention, the electric grid 7 is composed of crossed energized wires with a pore size of 15 cm, which can meet the normal passage of fish when not energized.

[0032] In step 2) of the present invention, the high-frequency pulse voltage transformer 9 can release high-frequency pulsed electricity to make fish stay away from the fish barrier device and the fish passage device.

[0033] In steps 1 and 2) of the present invention, the support column 5 is a hollow steel pipe structure, with one end fixedly connected to the steel frame 1 by welding and the other end inserted into the soil.

[0034] In steps 1 and 2) of the present invention, the steel ball 6 is a hollow structure, movably connected to the support column 5, and can rotate under the action of water flow, having the function of unloading force.

[0035] Example 1

[0036] During use, when the high-frequency pulse voltage transformer 9 is turned off, the fish blocking device will not function, and fish can enter the main canal through the fish passage hole 4 composed of the fish passage sleeve 12 and the steel ring 3. However, due to the action of the flexible plastic strip 11, fish cannot enter the drainage sluice through the fish passage hole 4.

[0037] Example 2

[0038] Before the drainage sluice discharges water, turn on the high-frequency pulse voltage transformer 9. Due to the existence of the power grid 7, fish will stay away from the fish passage device and the fish blocking device. The support columns 5 and the steel balls 6 will unload the impact of the water flow to maintain the stability of the device. Fish will not enter the drainage sluice through the fish blocking device and the fish passage device, thus solving the problem of fish escaping in the drainage sluice of the water conveyance main canal in the middle route of the South-to-North Water Diversion Project.

[0039] Example 3

[0040] It is necessary to maintain the support columns and steel balls every 30 days to prevent corrosion. The power grid and the high-frequency pulse voltage transformer need to be detected every day and should be turned off during non-use periods to ensure the safety of the staff.

[0041] As described above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project, characterized in that: It includes the following steps: 1) Assembly of the fish passage device: The fish passage device consists of a steel frame (1) and a support frame (2) to form the main structure. A steel ring (3) is fixedly welded on the steel frame (1) to form a fish passage hole (4). A fish passage sleeve (12) is fixedly installed in the fish passage hole (4) by means of tie straps. At the lower end of the fish passage device, there are support columns (5) and steel balls (6); 2) Assembly of the fish barrier device: The fish barrier device consists of an electric grid (7), a connecting wire (8), and a high-frequency pulse voltage transformer (9). One end of the connecting wire (8) is fixedly connected to the electric grid (7), and the other end is fixedly connected to the high-frequency pulse voltage transformer (9). At the lower end of the fish barrier device, there are support columns (5) and steel balls (6); 3) Usage method of the fish escape prevention device: When the high-frequency pulse voltage transformer (9) is turned off, the fish barrier device will not function, and fish can enter the main canal through the fish passage hole (4) composed of the fish passage sleeve (12) and the steel ring (3). However, due to the action of the flexible plastic strip (11), fish cannot enter the water discharge sluice through the fish passage hole (4). Before the water discharge sluice discharges water, the high-frequency pulse voltage transformer (9) is turned on. Due to the existence of the electric grid (7), fish will stay away from the fish passage device and the fish barrier device. The support columns (5) and the steel balls (6) will withstand the impact of the water flow and maintain the stability of the device. Fish will not enter the water discharge sluice through the fish barrier device and the fish passage device, thus solving the problem of fish escaping in the water discharge sluice of the middle route of the South-to-North Water Diversion Project. The fish passage sleeve (12) consists of a ring (10) and a flexible plastic strip (11); 4) Device maintenance: The support columns (5) and the steel balls (6) need to be maintained every 30 days to prevent corrosion. The electric grid (7) and the high-frequency pulse voltage transformer (9) need to be detected daily and should be in the off state during non-use periods. The support column (5) is a hollow steel pipe structure, and one end is fixedly connected to the steel frame (1) by welding. The steel ball (6) is a hollow structure and is movably connected to the support column (5) and rotates under the action of the water flow.

2. According to the fish escape prevention method applicable to the water discharge sluice of the middle route of the South-to-North Water Diversion Project described in claim 1, characterized in that: The high-frequency pulse voltage transformer (9) releases high-frequency pulsed electricity. The electric grid (7) is composed of crossed energized wires, and the aperture size is 15 cm.

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