JP2851580B2 - Electric screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric screen used to prevent fish from being taken into water intakes provided in rivers, lakes and the like.

[0002]

BACKGROUND ART Water supply, irrigation, power generation,
When water is taken for the purpose of obtaining water such as industrial water, fish may be taken into the water intake, and as a method for preventing this, a bar screen, a net screen, an air curtain, a red light, an acoustic device, Many methods using an electric screen or the like have been conventionally proposed.

[0003] Among these methods, DC (direct current) type electric screens are relatively simple in equipment and can be expected to be effective. This DC-type electric screen is configured by arranging a positively or negatively charged electrode rod in a screen shape in front of a water opening, and a fish approaching this is configured to generate a current flowing from the positive electrode to the negative electrode of the electrode rod in water. By sensing and not proceeding further, ingestion into the water intake is prevented.

[0004]

However, as shown in FIGS. 5 and 6, the conventional DC-type electric screen is provided in front of the intake gate 11 (intake channel 1 provided on one shore of the river 5). A concrete bridge 6 for a passage is formed in the concrete floor plate 61, and the electrode bar 31 is suspended and fixed to the back surface of the concrete floor plate 61. Therefore, in order to install such an electric scoone after the operation of the water intake equipment, it is necessary to completely drain the water once, and there is a problem that the installation is troublesome and the water intake equipment cannot be used during that time.

[0005] On the other hand, in rivers and lakes, the water level may greatly change due to various factors such as tides, flooding due to rainfall, and wind effects. For example, when the water level becomes extremely low (L ₁ → L _{2 in} FIG. 6), the exposed length of the electrode rod (the length of the part protruding from the water surface) becomes long, so that in the unlikely event that a person is in the intake channel, If the electrode rod enters the exposed area of the electrode rod, there is a high possibility that an electric shock will occur, and the wind will shake the electrode rod like a pendulum, causing the electrode rod to fall or be damaged. There is also a risk.

[0006] The present invention has been made in view of such problems of the prior art, and can be easily installed even after the operation of the water intake facility, and can cope with a large change in water level. It is an object of the present invention to provide an electric screen which can ensure safety by using the electric screen.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a column standing on both sides of a waterway, and a guide member provided to be vertically movable along each column. A plurality of floats with suspended electrode rods are arranged in series, and adjacent floats are connected at predetermined intervals by wires connected to the respective electrode rods, and the other electrode rods are connected to the electrode rods at both ends. And a main body formed by connecting an electric wire not connected to the main body, and electric wires at both ends of the main body are engaged with the guide member.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing a use state of an electric screen corresponding to one embodiment of the present invention, FIG. 2 is an enlarged view for explaining a configuration of the electric screen, and FIG. It is a longitudinal section for explaining an operation of an electric screen.

As shown in FIG. 1, two pairs of opposing columns 2 (2a to 2d) are erected near walls on both sides of an intake channel 1 provided on one shore side of a river, and oppose each other. A main body 3 mainly composed of an electrode rod 31, a float 32, and an electric wire 33 between 2a and 2b and between 2c and 2d.
(3A, 3B) are bridged. Further, by connecting the connected electric wire 33 to the power source, the electrode rod 31 of the river side main body 3A is negatively charged, and the main body 3 of the intake gate 11 side is negatively charged.
The B electrode rod 31 is positively charged. Thus, underwater, current flows from the main body 3B side to the 3A side.

The structure of the main body 3 is as shown in FIG. 2, and a hook-shaped hanging fitting 32a for attaching the electrode rod 31 to the lower surface of a float 32 shaped like a crushed sphere from above and below. Is attached. This bracket 32a
Is pierced into the float 32, and the base is connected to the internal wiring 33a in the float from which the fork branches.
Are connected, and each internal wiring 33a extends from a position apart along the major axis of the ellipse on the upper surface of the float 32 to the outside,
An electric wire 33 connects between the adjacent floats 32. Further, a bar 34 is fixed to a lower portion between the adjacent floats 32 so as to maintain the space and prevent the contact.

The member composed of the float 32, the electric wire 33, and the hanging bracket 32a is, for example, placed in the float 32 into which the hanging bracket 32a is pierced by a predetermined length from each position on the upper surface thereof. The internal wiring 33a is inserted in a state of extending to the outside, and the internal wiring 33a is connected to the hanging bracket 32a. It is manufactured by connecting the wires extending to the outside of the corresponding float 32 and finally fixing the bar 34.

Then, each hanging bracket 32a of this member
The main body 3 is formed by attaching the electrode rod 31 to the electrode rod (for example, the upper part of the electrode rod 31 is also formed in a hook shape and hooked on a hanging bracket 32a). In addition, according to the above-described manufacturing method, there is an electric wire 33 of a predetermined length extending from the float 32 to the outside at both ends of the main body 3, and a single internal wiring 33 b penetrates through the float 35. One wire 33c of a member having both ends extended to the outside is connected, and the other wire 33d is wound around a roller (guide member) 4 that moves vertically along the column 2.

The electric wires 33, 3 connecting between the floats
3c is connected in series from one end to the other end of the main body 3, and each of the main bodies 3A and 3B is connected to a power supply 33d on one end side so that all the electrode rods 31 of each main body are negatively or positively charged. You. Therefore, the electric wire 33d on one end side of the main body 3
Has a length above the roller 4 extending to a power source installed near one shore of the intake channel 1 (a length corresponding to the lowest water level), but as shown in FIG. The electric wire 33d on the side (right side in FIG. 3) has only a length to be wound around the roller 4, and is fixedly wound around the roller 4.

Therefore, the electric screen composed of the main body 3, the rollers 4 and the columns 2 can be installed without draining water, so that it can be easily installed even after the operation of the water intake facility. Further, since the electrode rod 31 is attached below the float 32, as shown in FIG. 3, even when the water level changes greatly (L ₁ ← → L ₂ ), the float 32 is always on the water surface and the electrode rod 31 Is not exposed. for that reason,
Even if the water level changes significantly, safety is ensured. In addition, at the time of this water level change, since the roller 4 moves up and down along the column 2, the whole body 3 automatically moves up and down.

If a large flood is expected, a major disaster can be prevented beforehand by removing the main body 3 after shutting off the power supply. In addition, float 32
As described above, the electrode rod 31 may be suspended by hooking the upper hook of the electrode rod 31 to the suspension fitting 32a fixed to the lower surface of the float 32, as described above. Any structure may be used as long as it can be suspended from the float 32. Also,
The guide member is not limited to the roller 4.

The length of the electrode rod 31 is selected according to the average water level at the place where the electrode rod is installed. However, it is preferable that the length of the electrode rod 31 expands and contracts with the fluctuation of the water level. For example, as shown in FIG. 4, the electrode rod 31 has a double structure in which the electrode tube 31 is inserted into the sheath tube 7. The inner diameter of the sheath tube 7 is reduced at the lowermost and middle portions of the
A guide 72 for preventing the inner tube 1 from coming into contact with the inner surface of the sheath tube 7 is provided, and a stopper 73 for preventing the electrode bar 31 from falling down is provided at the upper portion. A wire 33A wound in a coil shape is connected to an upper portion of the electrode rod 31, and an upper end thereof is connected to an internal wiring 33 in a float 32 fixed to an upper portion of the sheath tube 7.

With such a structure, the electrode rod 31 installed in water extends the electric wire 33A by its own weight, and its lower end hits the bottom of the water, and has a length corresponding to the water level. However, the length is shortest when the upper end surface of the electrode rod 31 hits the stopper 71 as shown in FIG. 4, and becomes longest when the stopper 73 hits the guide 72 in the middle.

[0018]

As described above, according to the electric screen of the present invention, the electric screen can be easily installed even after the operation of the water intake facility, and the safety can be ensured in response to a large change in water level. it can.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a use state of an electric screen corresponding to one embodiment of the present invention.

FIG. 2 is an enlarged view for explaining a configuration of the electric screen of FIG.

FIG. 3 is a longitudinal sectional view for explaining the operation of the electric screen of FIG. 1;

FIG. 4 is a sectional view showing an electrode rod having a double structure.

FIG. 5 is a plan view showing an intake port provided in a river.

FIG. 6 is a schematic sectional view showing a conventional electric screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake channel 2, 2a-2d pillar 3, 3A, 3B main body 4 Roller (guide member) 31 Electrode rod 32 Float 33 Electric wire

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02B 9/04 A01M 29/00 E02B 5/08 101

Claims (1)

(57) [Claims] Claims: 1. A column standing on both sides of a waterway, a guide member provided to be movable up and down along each column, and a plurality of floats with electrode rods suspended therefrom are arranged in series. And a main body formed by connecting adjacent floats at predetermined intervals with electric wires connected to the respective electrode rods, and connecting the electric wires not connected to other electrode rods to the electrode rods at both ends. An electric screen, wherein the electric wires at both ends of the main body are engaged with the guide member.