JPH0441570B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a method for installing electrodes of an electric screen generating device that generates an electric screen for blocking swimming of fish and shellfish in seawater when cultivating fish and shellfish. Regarding.

[Conventional technology]

Generally, when cultivating fish and shellfish, a cage is set up in seawater, and the fish and shellfish are cultured within the cage.Usually, a net is stretched around the seawater to form a cage, and the net is tied around the outside of the cage. This prevents fish and shellfish from escaping into the cage and from entering the inside of the cage, but at the early stage of aquaculture, farmed fish are still young fish with a body length of several centimeters, and this prevents fish and shellfish from swimming. In this case, it is necessary to use a very fine mesh net to be placed in the seawater.

However, in sea areas where tidal changes can be as large as several meters, the nets are easily damaged, and even if the damage is slight, young fish can easily escape, resulting in the inconvenience of requiring a great deal of effort and expense to maintain and maintain the nets. occurs,
In order to eliminate these inconveniences, conventionally, the sea areas where the fish cages are installed are selected in areas where the water depth is not too deep, the waves are calm, and there are few tidal changes, but even in areas that meet these conditions, typhoons The nets may be washed away due to water pollution, etc., or damaged due to contact with ships, which requires a great deal of effort and expense to maintain and maintain the nets, and the nets cannot reliably block the swimming of fish and shellfish. There is a problem.

In addition, when carrying out large-scale aquaculture such as at marine farms, the total length of the nets used is extremely long, and the labor and expense required to maintain and maintain the nets are correspondingly large. Using nets for isolation is not the best strategy for large-scale aquaculture.

Therefore, the applicant has proposed the following electric screen generator.

That is, a plurality of vertically elongated rod-shaped conductive electrodes are arranged at approximately equal intervals in seawater, and the conductive electrodes are electrically connected to each other to form a first electrode row. Similarly to the electrode rows, a plurality of elongated rod-shaped conductive electrodes are arranged in the vertical direction to form the second to Nth electrode rows, and each electrode row is arranged parallel to each other, not shown. A power source for generating an electric screen applies, for example, a DC voltage between each electrode column so that the potential of each electrode column is different, thereby generating an electric screen having a different electric field strength between each electrode column.

Fish and shellfish that enter such an electric screen are electrically stimulated, and when the electric field strength is low, they show a startled state, and as the electric field strength increases, they can experience strong electric shocks such as mild numbness, paralysis, and even asphyxia. The fish and shellfish will react and become unable to swim through the electric screen, and if each electrode row is arranged so that the electric screen surrounds a specific area, the fish and shellfish will be confined within the area surrounded by the electric screen. As a result, the swimming of fish and shellfish is reliably blocked without using nets as in the past, and the tide level,
It is not affected by ocean conditions such as tides and water depth, or weather conditions such as typhoons, making it suitable for large-scale aquaculture such as on marine farms.

[Problem that the invention seeks to solve]

However, in this type of device, when installing each conductive electrode, especially when replacing it with a new one,
It is necessary to accurately maintain the pitch between each conductive electrode, and each conductive electrode must be reinstalled in its designated position. However, since it is difficult to see the state of the seabed from above the sea surface, it is necessary to submerge under the sea and conductive electrodes. This poses a problem in that it requires installation work, which places a heavy burden on the worker and is also highly dangerous.

Therefore, the technical object of the present invention is to enable the installation work of conductive electrodes to be carried out even from above the sea surface, thereby significantly reducing the burden on the operator.

[Means for solving problems]

This invention has been made with the above-mentioned points in mind, and includes a plurality of vertically elongated conductive electrodes arranged in seawater at approximately equal intervals and arranged parallel to each other. an electrode array, a connection body that electrically connects each of the conductive electrodes of each of the electrode materials, and an electric screen generating device that applies a voltage between each of the electrode arrays so that the potentials of each of the electrode arrays are different. In a method for installing electrodes of an electric screen generator equipped with a power source, the lower ends of a plurality of vertically elongated guide bodies are fixed to the locations of the conductive electrodes on the seabed, and the upper ends are fixed to the sea surface. This is a method for installing electrodes of an electric screen generator, characterized in that each conductive electrode is installed in seawater using the guide bodies as guides.

[Effect]

Therefore, in the present invention, the lower end portions of the plurality of vertically elongated guide bodies are fixed at the locations of the respective conductive electrodes on the seabed, and the upper end portions are led out above the sea surface, so that the respective conductive electrodes is installed in seawater using each guide body as a guide, and unlike conventional methods, when installing each conductive electrode, there is no need for an operator to dive into the sea and position the conductive electrode. Conductive electrodes can be easily positioned on the sea surface, greatly reducing the burden on workers.

Embodiments Next, the present invention will be described in detail with reference to drawings showing embodiments thereof.

First, in FIGS. 1 and 2 showing the embodiment, 1 is a concrete base placed on the seabed, and a plurality of convex supports 2a are arranged at regular intervals.
are integrally formed in a row, and a plurality of similar convex support stands 2b, 2c are integrally formed in parallel, and each support stand 2a, 2b, 2c has a female thread in the center. are buried in each.

4a, 4b, 4c are support stands 2a to 2 of the base 1
Connection cable 5 is buried under each row of c and serves as a connecting body to electrically connect conductive electrodes of each electrode row to be described later, and 5 has a lower end connected to each support base 2a to 2a.
2c, a plurality of vertically elongated flexible guide bodies made of chains, wires, ropes, etc., which are fixed to the inner bottom of the receiver 3 and whose upper ends are led out above the sea surface; 6, each guide body; A U-shaped hook 7a is attached to the upper end of the U-shaped hook 7a, and the male screw at the lower end of the vertical cylindrical conductive electrode 8a, which is longer than the depth of the plurality of water, is screwed into the receiver 3 of each support stand 2a.
First electrode rows 7b arranged at equal intervals
The male screws at the lower ends of the vertical cylindrical conductive electrodes 8b, which are longer than the depth of the water, are screwed into the receivers 3 of each support base 2b, and the second electrodes are arranged at equal intervals.
The electrode row 7c is a third electrode row, in which the male screws at the lower ends of the plurality of vertically extending cylindrical conductive electrodes 8c, which are longer than the water depth, are screwed into the receivers 3 of each support stand 2c, and are arranged at equal intervals. Each conductive electrode 8a
The guide bodies 5 are respectively inserted into the insides of ~8c,
Each hook 6 is removably locked to the upper end of each conductive electrode 8a to 8c, so that the upper end of each guide body 5 is led out above the sea surface, and a waterproof cover 9 is attached to the upper end of each conductive electrode 8a to 8c, respectively. It has been blocked.

In addition, 10 is connected to the guide body 5 by connecting the U-shaped hook 11 attached to the lower end to the hook 6 during installation such as replacing each of the conductive power sources 8a to 8c.
Although not shown, it is an auxiliary wire connected to a power source for generating an electric screen that applies, for example, a DC voltage between each electrode row 7a to 7c so that each potential of each voltage pole row 7a to 7c is different. It is provided.

For example, when replacing a corroded conductive electrode 8a with a new one, as shown in FIG.
1, and pull the upper end of the auxiliary wire 10 to apply some tension to the guide body 5, and conductive electrode 8a
, remove the male screw at the lower end from the receiver 3, lift the upper end of the conductive electrode 8a with a crane or the like via the support rope R, pull up the conductive electrode 8a from the sea, and remove the auxiliary wire 10 from the conductive electrode 8a. By pulling it out, the conductive electrode 8a is removed.

At this time, the conductive electrode 8a is removed using the guide body 5 and the auxiliary wire 10 as guides.

Next, insert the auxiliary wire 10 from the lower end side of the new conductive electrode 8a, and suspend the conductive electrode 8a using a crane or the like, in the opposite manner to the above-mentioned removal.
The conductive electrode 8a is immersed in the sea along the auxiliary wire 11 and the guide body 5, the conductive electrode 8a is rotated, the male thread at the lower end is screwed into the receiver body 3, and the hooks 6 and 1 are screwed together.
1 and remove the auxiliary wire 10, and at the same time, lock the hook 6 to the upper end of the conductive electrode 8a to hold the upper end of the guide body 5 above the sea surface, and attach the cover 9. As a result, the conductive electrode 8a is installed, and the replacement is completed.

At this time, the new conductive electrode 8a is connected to the auxiliary wire 1.
0 and the guide body 5 as a guide, there is no need for the operator to dive into the sea and position the conductive electrode 8a as in the conventional method. It becomes possible to easily perform positioning, and the burden on the operator is significantly reduced.

It goes without saying that a vertically elongated rod-shaped guide body 12 as shown in FIG. 3 may be used as the guide body.

Further, as shown in FIG. 4, when installing a solid cylindrical conductive electrode 13, a plurality of ring bodies 14 are attached to each conductive electrode 13, and each ring body 14 is provided with a guide body 5 or 12. The present invention can be carried out in the same manner even if it is made to pass through.

Furthermore, the number of electrode rows may be four or more rows.

〔Effect of the invention〕

As described above, according to the method for installing electrodes in an electric screen generator of the present invention, each conductive electrode is installed in seawater using a vertically elongated guide body as a guide. When installing a new conductive electrode, there is no need for the worker to go underwater to position the conductive electrode, as was the case in the past, and the new conductive electrode can be easily positioned on the sea surface, greatly reducing the burden on the worker. This makes it possible to reduce the amount of damage and improve safety, and the effect is extremely large.

[Brief explanation of the drawing]

The drawings show an embodiment of the method for installing electrodes of an electric screen generator of the present invention, and FIGS. 1 and 2 are perspective views and partial cross-sectional views of one embodiment, and FIGS. 3 and 4 are FIG. 6 is a perspective view of a portion of each of the other embodiments. 4a-4c... Connection cable, 5, 12... Guide body, 7a-7c... Electrode row, 8a-8c, 1
3... Conductive electrode.

Claims (1)

[Claims] 1. A plurality of electrode rows formed by disposing a plurality of vertically elongated conductive electrodes at approximately equal intervals in seawater and arranged in parallel to each other, and each of the conductive electrodes of each of the electrode rows. In a method for installing electrodes of an electric screen generator comprising connecting bodies that are electrically connected to each other and a power source for generating an electric screen that applies a voltage between each of the electrode rows so that the potentials of each of the electrode rows are different. , the lower end portions of a plurality of vertically elongated guide bodies are fixed to the positions where the conductive electrodes are arranged on the seabed, and the upper ends are led out above the sea surface, and each of the conductive electrodes is guided by using the guide bodies as guides. A method for installing electrodes in an electric screen generator, characterized by installing the electrodes in seawater.