JPH07119450B2 - 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. The present invention relates to a biofouling prevention device that prevents the adherence.

[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 the water, and larvae attach to arbitrary positions on the wall surface while flowing through the water channel, and then lay eggs or grow. In addition, this form is the same for organisms such as insects other than Tobigera.

Moreover, the thickness of attachments such as toebilla is more than 10 cm, and the intake channel also extends for several km, resulting in water intake loss and reduction in 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.

On the other hand, it is possible to prevent the attachment of organisms by an electric screen, but since the attached organisms generally have a short body length, they must form a strong electric field, which adversely affects organisms such as fish around them.

Furthermore, depending on whether the attachment route of the attached organisms is the wall surface route of the form A or the wall surface route of the form B due to swimming or floating,
Different means of forming more effective electric screens.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a biofouling prevention device capable of effectively preventing the adhesion of organisms such as a wing.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the biofouling prevention device of the present invention comprises a plurality of linear, reticulated, needle-shaped, rod-shaped, etc. around a biofouling prevention area near the water surface of the wall surface of a structure constructed in water. The electrodes are arranged in a ring shape, a voltage having alternating poles is applied to each of the electrodes, and a non-electric field region is formed in the prevention area.

[Work]

The biofouling prevention device of the present invention configured as described above,
Since the electric screen is formed around the organism attachment preventing area near the water surface of the structure, when the attachment route of the attached organism is the wall route of the form A, the attachment of the organism by the form A is effectively performed. It is preventable, has a simple structure, and is extremely inexpensive.

The electric field generated by the electric screen is only a part of the wall surface and does not electrically affect aquatic organisms such as fish.

〔Example〕

One embodiment will be described with reference to FIGS.

In these drawings, (1) is a water intake channel having a substantially U-shaped cross section, which communicates with an intake port for a hydroelectric power station formed at the foot of a mountain. (2) is a structure forming the intake channel (1), (3) is a barrier-forming region formed in an annular shape around the biofouling prevention area (4), and the wall surface (5) of the structure (2) Are formed near the water surface (6) of
Electrodes having a mesh shape, a needle shape, a rod shape, or the like are arranged, a voltage having alternating poles is applied to each electrode, and the biofouling prevention area (4) is a non-electric field area.

Therefore, when the organism attachment route is the wall surface route of the form A, the organism attachment to the prevention area (4) is prevented.

The length of the barrier formation region (3) in the water intake direction is several tens of meters, and the width of the formation region (3) is several tens cm.

Next, FIG. 2 and FIG. 3 show an example of means for forming the barrier forming region (3) of FIG. 1, in which six electrodes (8) are arranged in an annular shape on the insulating substrate (7). A voltage is applied from a direct-current control power source (9) so that the adjacent electrodes (8) have alternating poles.

The substrate (7) is fixed to the wall surface (5) with anchor bolts or the like.

Next, FIG. 4 shows an apparatus for confirming the attachment route of living organisms, where one side is several meters and width is several tens of centimeters near the water surface (6) of the wall surface (5) of the structure (2). Thickness from (5) a few cm
The barrier (10) was formed, and the state of attachment of the flap between the area (11) surrounded by the barrier (10) and the outer wall surface (5) of the barrier (10) was examined.

As a result, it was found that no organisms were attached to the region (11) as compared with the wall surface (5) on the outer side of the barrier (10), and the attachment by the wall path of the form A can be prevented.

If the outer wall surface (5) of the barrier (10) and the region (11) are adhered to each other to the same extent, the adherence is due to swimming and floating of the form B, and also to the region (11). When the adhesion is less than the outside of the barrier (10), it is a combination of the above forms A and B.

〔The invention's effect〕

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

Since an electric screen is formed around the biofouling prevention area (4) near the water surface (6) of the wall surface (5) of the structure (2), when the wall surface (5) is attached as a route, living things such as a bellows Can be more effectively prevented from adhering, the structure is simple, and the electric field of the electric screen is part of the wall surface (5), so it prevents electrical adverse effects on aquatic organisms such as fish. it can.

[Brief description of drawings]

1 to 3 show one embodiment of the biological adhesion preventing device of the present invention, FIG. 1 is a perspective view, and FIGS. 2 and 3 are front and plan views of an example of a barrier forming means. FIG. 4 is a perspective view of the experimental device. (2) ... Structure, (3) ... Barrier forming region, (4)
…… Biofouling prevention area, (5) …… wall surface, (6) …… water surface, (8) …… electrode, (9) …… control power supply.

 ─────────────────────────────────────────────────── ─── 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-house (56) References Japanese Patent Publication Sho 62-33366 (JP, B2)

Claims (1)

[Claims] 1. A plurality of linear, net-like, needle-like, or rod-like electrodes are annularly arranged around a biofouling-prevention area near the water surface of the wall surface of a structure constructed in water. A biofouling prevention device in which a voltage having alternating polarities is applied to the non-electric field in the prevention area.