JPH07119448B2 - Biofouling prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure constructed in water, such as a water intake canal for a hydroelectric power plant, and particularly to a wall surface in water near the water surface of the structure. The present invention relates to a biofouling prevention device that prevents biofouling such as.

[Conventional technology]

In general, the following five processes can be inferred as the processes by which the flaps adhere to the wall surface of the intake channel near the intake.

Adults that stopped on the wall from the air are distributed along the wall along the wall and lay eggs.

Adults landing from the air swim or are washed away and reach the wall surface, and then spread along the wall to the underwater surface to lay eggs.

Adults landing from the air dive and swim in the water to reach arbitrary positions on the wall and lay eggs.

Adults landing from the air dive, but they reach the wall surface by themselves or at a relatively shallow water depth and lay eggs.

After the larvae that hatched in the mountain stream in the upstream reach the stream and go down the river, they reach the wall surface of the canal and are distributed as they are.

Next, the adhesion process can be roughly classified into the following two forms.

A Adults, regardless of walking, swimming, or shedding, once reach the wall surface near the water surface and then distribute along the wall to lay eggs.

B. Adults freely dive in water, and larvae attach to an arbitrary position on the wall surface while flowing through a water channel, and then spawn or grow. In addition, this form is the same for organisms such as insects other than Tobigera.

And, the thickness of attachments such as leaflets is more than 10 cm, and the intake channel extends to several Km, which causes intake loss and reduces power generation.

Therefore, conventionally, the attached organisms are removed by mechanical or human work.

[Problems to be Solved by the Invention]

Conventionally, since the adhered organisms are removed by mechanical and human work, there is a problem that enormous cost and time are required.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a biofouling preventive device that can easily prevent the adhesion of organisms such as a wing.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the biofouling preventive device of the present invention comprises a plurality of linear, rod-shaped, parallel to the water surface of the wall surface of the water structure near the water surface of the water structure.
A belt-like electrode is supported by an insulating support, and a voltage that is an alternate pole is applied to each electrode to form an electric field near the water surface.

[Action]

The biofouling prevention device of the present invention configured as described above,
Since a plurality of electrodes are supported in parallel along the water surface on a wall surface in the water near the water surface of the structure, a voltage which is an alternate pole is applied to each electrode, and an electric field is formed near the water surface, the form A It is possible to prevent the attachment of living things due to, and the structure and installation work are simple, and it is extremely inexpensive.

When an electric field is formed only near the water surface, it has no electrical effect on aquatic organisms such as fish.

〔Example〕

One embodiment will be described with reference to FIGS. 1 to 4.

In these drawings, (1) is an intake for a hydroelectric power station formed at the foot of the mountain, (2) is an intake channel for introducing water with a substantially U-shaped cross section that communicates with the intake (1), and (3) is intake. Road (2)
Structure (4) is a barrier formation region, which is formed parallel to the water surface (6) near the water surface (5) of the structure (3) along the water surface (5), An electric field is formed near.

Reference numeral (7) is a linear, rod-shaped, strip-shaped electrode or the like, and a plurality of electrodes are arranged in parallel in the barrier formation region (4) along the water surface (5). Reference numeral (8) is an insulative support which is fixed to the wall surface (6) and supports each electrode (7).

(9) is an AC power supply, and both ends of the AC power supply (9) are connected to the electrodes (7) as shown in FIG. 2 so that the electrodes (7) arranged in parallel have alternating poles.

The width L of the barrier forming region (4) is preferably 50 cm to 1 m, and in this case, it blocks the latent path of adult larvae.

When the position of each electrode (7) is K with respect to the vertical length 1 of the wall surface (6), the barrier strength E is as shown in FIG. 4, and only the vicinity of the electrode (7) is extremely strong. If a barrier is formed on the entire surface of the wall surface (6), it is possible to prevent the attachment of organisms due to the form B.

〔The invention's effect〕

Since the present invention is configured as described above, it has the effects described below.

On the underwater wall surface (6) near the water surface (5) of the structure (3),
A plurality of electrodes (7) are supported in parallel along the water surface (5), a voltage with alternating poles is applied to each electrode (7), and an electric field is formed near the water surface (5). Adhesion can be prevented, the structure and mounting work are simple, and the cost is extremely low.

Furthermore, since an electric field is formed only near the water surface, it has no electrical effect on aquatic organisms such as fish.

[Brief description of drawings]

The drawings show one embodiment of the organism adhesion preventing device of the present invention, FIG. 1 is a perspective view of a part of the whole being cut, FIG. 2 is a perspective view of a wall surface portion, and FIG. 3 is a left side surface of FIG. FIG. 4 and FIG. 4 are barrier strength distribution charts. (3) …… Structure, (5) …… Water surface, (6) …… Wall surface,
(7) …… Electrode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Abe 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Hidehiko Maebata 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture No. Hitachi Shipbuilding Co., Ltd. (72) Inventor Hironari Arai 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Hiroyuki Carpenter 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka, Hitachi Shipbuilding Co., Ltd. (72) Inventor Masanori Tsukahara 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Seiji Otani 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. In-company (56) References Japanese Patent Publication Sho 60-23506 (JP, B2)

Claims (1)

[Claims] 1. A plurality of linear, rod-shaped, strip-shaped electrodes, etc. are supported in parallel on the wall surface of the structure underwater near the water surface of the structure constructed underwater by an insulating support. Then, a biofouling prevention device in which a voltage having alternating polarities is applied to each of the electrodes to form an electric field near the water surface.