JPH0238608A - Method for preventing adhesion of oceanic life - Google Patents

Abstract

PURPOSE:To prevent adhesion of oceanic life to a structure body for a long period of time by sticking a sheet having densely implanted mink-like furs over the structure's surface that is in touch with seawater. CONSTITUTION:To the inner surface of the straight part 2 at the deepest part 1 of a suction pipe that is to be installed underwater, a sheet 5 having densely implanted white or green mink-like furs 4 is stuck with an adhesive or the like. The sheet 5 is also stuck to the inner surface of an L-shaped part 3 and to the outer surface around the opening of the pipe. A plurality of permanent magnets 15 may be installed around the opening of the L-shaped part 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to water intake/drainage pipes buried in the sea, storage tanks for crude oil, LPG, etc. floating on the sea, oil fences, buoyant buoys for fish farms, and offshore buoys. , seawater storage tanks for facilities that use seawater such as aquariums, crude oil suction pipes and drilling equipment in offshore oil fields, transducers for fish finders, and other structures that come into contact with seawater, such as purple shells, oysters, and Fujibbo, are exposed to the ocean. This invention relates to a method for preventing attachment of living organisms.

[Conventional technology]

In sewage treatment plants and human waste treatment plants, pipes are installed under the sea to pump up and discharge seawater for use as working water, but these pipes are generally made of vinyl chloride and have a hard and smooth surface. Marine life, especially the larvae of shellfish such as purple shellfish, oysters, and Fujibbo floating in the sea, tend to attach to it. Therefore, if a large number of these larvae attach to the inner or outer surface of the pipe and grow and reproduce, the flow rate within the pipe may decrease, causing problems in the work and treatment at the facility.

Therefore, at present, when the amount of attached shellfish has increased considerably, people dive into the sea and manually remove the shellfish.

In addition, in order to solve this problem, a product called "corrugated steel pipe" is known, which prevents shellfish from attaching to the pipe by generating brush ions in the sea and killing the shellfish larvae. However, this method cannot be used in practice because it contaminates seawater.

Furthermore, the above situation is not limited to water absorption/drainage vibrators, but also applies to other structures that come into contact with seawater. For example,
Storage tanks for crude oil and LPG floating on the sea, oil fences, buoyancy buoys for fish farms, offshore buoys, etc. are usually made of metal,
It is made of synthetic resin, etc., and its surface is coated with anti-corrosion paint or anti-fouling paint, but since these are used for long periods of time ranging from several years to several decades, they do not come into contact with seawater. Large amounts of shellfish like the ones mentioned above also stick to the bottom and sides. As a result, the buoyancy of the ship decreases due to the increase in its own weight, and there is a risk that the amount of the part that sinks below the sea surface will increase more than necessary.

In addition, problems such as shellfish adhering to the inner and outer surfaces of seawater storage tanks in facilities that use seawater such as aquariums, crude oil suction pipes and drilling equipment in offshore oil fields, and transducers of fish finders also occur. In the case of seawater storage tanks such as those used in aquariums, there is a risk of contamination of the stored seawater if shellfish adhere to the inner surface of the tank.Furthermore, the weight of crude oil suction pipes and drilling equipment in offshore oil fields may increase. There are problems such as damage to pipes and damage to fish finders, and problems such as disturbance of magnetic waves caused by attached shellfish to the transducers of fish finders.

Therefore, even in such structures, adhering shellfish are removed manually in the same manner as in the case of the water absorption/drainage pipes.

[Problem to be solved by the invention]

As mentioned above, conventional structures cannot effectively prevent the adhesion of marine organisms such as shellfish, so attached marine organisms are manually removed each time. Not only is this labor intensive, it must be done frequently during the breeding and growing seasons of shellfish, and the work becomes even more difficult during the winter. Furthermore, during removal work, it may be necessary to suspend operation and use of facilities and equipment.

In addition, although the above-mentioned "corrugated steel pipe" can prevent shellfish from adhering to it, it generates copper ions, which has the disadvantage of contaminating the seawater itself. It is not possible to sufficiently prevent water damage, it takes a lot of effort to repaint, and it also contaminates the seawater itself.

This invention was made in view of these circumstances, and its purpose is to almost completely prevent marine organisms such as shellfish from adhering to structures in contact with seawater over a long period of time. At the same time, it is an object of the present invention to provide a method for preventing the adhesion of marine organisms that can be easily and inexpensively carried out and is safe. We are taking appropriate measures.

That is, the structure is characterized in that a sheet with white or green mink-like hairs densely grown on its surface is attached to the part of the structure that comes into contact with seawater, with the hairs facing toward the seawater side.

As the above-mentioned sheet, any known sheet can be used, such as a cloth with a mink-like raised surface, cloth, or a sheet with mink-like hair flocked on the surface of the sheet. It is particularly preferable to use boa cloth as the material. Further, it is preferable that the bristles stand up substantially at right angles to the surface of the sheet, rather than lying along the surface of the sheet, and it is preferable that the bristles be hard enough to swing back and forth due to wave motion.

Of course, the color of the fur on the above sheet can be any color, but in order to best exhibit the effect of preventing the adhesion of marine organisms such as shellfish, it is best to use white, and green. It is also effective.

Additionally, in order to further increase the effect of preventing the attachment of marine organisms, magnets can be embedded in addition to the above-mentioned sheet near the parts of the structure that come into contact with seawater. [Function] Marine organisms such as shellfish floating in the sea It has been found that the larvae do not attach to soft surfaces or surfaces with swaying hair. In addition, it is difficult to adhere to surfaces where hair is densely grown. Therefore, if a sheet with dense mink-like hairs on the surface is attached to the part of the structure that comes into contact with seawater, the hairs will sway due to the movement of the seawater, and the larvae of marine organisms such as shellfish will stick to them. can be prevented.

〔Example〕

Hereinafter, an embodiment in which the method of the present invention is applied to a water suction pipe will be described with reference to the accompanying drawings.

(1) is the tip of a water absorption pipe that will be buried in the sea, and is composed of a straight section (2) with both ends open, and an L-shaped section (3) that is bent into an L shape and also open at both ends. . The straight portion (2) and the L-shaped portion (3) are connected by fitting into each other and gluing them.

The inner surface of the straight part (2) has mink-like hair (4) on the surface.
The sheet (5) with densely grown is the attachment.

This sheet (5) is glued to the inner surface of the straight portion (2) with the bristles (4) facing inward, except for the vicinity of the end on the side where it connects to the base (6) of the water absorption pipe. It covers almost the entire inner surface. Installation of this seat (5) is as follows:
Although it is sufficient to use adhesive alone, in this example, in order to further strengthen the attachment of the sheet (5), the end of the water absorption pipe on the base (6) side is further fixed with a fixing belt (7). has been done.

As shown in FIG. 4, this fixing belt (7) is pressed against the seat (5) from the inside of the straight portion (2) along the circumferential direction, and the hole (8) of the fixing belt (7) The bolt (9) passed through the through hole (
10) and is fixed by tightening with a nand (11) from the outside via a washer (12).

At the end of the straight portion (2) on the base (6) side, there is a bolt hole (14) for connecting the tip (1) to the base (6).
) with the flange (13) is the attachment.

As the sheet (5), any known mounting sheet can be used, such as cloth with a mink-like raised surface, cloth, or a sheet with flocked hair on the surface, but the flocked one is not durable. Since this may not be sufficient, in this embodiment, a boa cloth made of raised (piled) polyester cloth is used. The length of the hair (4) is
Although it varies depending on the relationship with the diameter of the base (6) of the water suction pipe, it is usually several days or about ICl3. Also,
Preferably, the bristles (4) are approximately perpendicular to the plane of the sheet (5).

Further, according to experiments, it is best to set the color of the hair (4) to white. This is thought to be due to the fact that white color absorbs and emits ultraviolet rays in the sun's rays best, and that shellfish, which tend to adhere to white color, physiologically dislike it.

Experiments have also shown that green (either dark or light) is also quite effective.

With these colors, even if shellfish are attached, they tend to fall off naturally due to the increase in weight of the shellfish as they grow, and even if they are attached, removal work is very easy.

Like the straight part (2), the L-shaped part (3) has the same sheet (5) glued to its inner surface as above, but since shellfish are particularly likely to adhere to the area near the opening, The same sheet (5) is glued to the outer surface with the bristles (4) facing outward. This L-shaped portion (3) is installed with its opening facing upward to make it difficult to suck in sludge from the seabed.

Further, a plurality of permanent magnets (15) are embedded in the side wall near the opening of the above-mentioned dome-shaped portion (3). In this embodiment, as shown in FIG. 3, the permanent magnets (15) are fitted into notches (16) disposed at regular intervals in the circumferential direction of the L-shaped portion (3). . In this case, magnetic lines of force are generated near the opening, making it difficult for shellfish larvae to enter the water suction pipe, thereby further preventing shellfish from adhering to the pipe.

As shown in FIG. 2, the tip (1) of the water suction pipe contacts the flange (17) provided with the flange (13) at the end of the water suction pipe's base (6) on the opening side, and the bolt ( 18
) and NAND (19).

As a result of experiments using the tip (1) of the water absorption pipe configured as described above, it was found that shellfish larvae were found on the inner surface of the straight section (2) and the L-shaped section (3), and on the outer surface of the L-shaped section (3). ↓It did not attach or reproduce at all. Therefore, this tip (1
) to the open end of the base (6) of the water suction pipe,
It is clear that it is possible to almost completely prevent shellfish from adhering to the water suction pipe.

In addition, in the above explanation, in order to facilitate installation and replacement of the sheet (5), the sheet (5) with dense hair (4) is attached to the tip (1) of the water absorption pipe, and then the sheet (5) is attached to the base in the sea. (6), but it goes without saying that the sheet (5) may be directly attached to the vicinity of the opening of the existing water suction pipe.

Although an example in which the method of the present invention is applied to a water suction pipe has been described above, this method is not limited to water suction pipes. For example, the above-mentioned sheet (5) can be attached by gluing, bolting, etc. to the parts of other structures that come into contact with seawater, such as storage tanks for crude oil, LPG, etc. floating on the sea, oil fences, etc., as necessary. permanent magnet (
15), it can be easily implemented.

〔Effect of the invention〕

As is clear from the above explanation, the method for preventing the adhesion of marine organisms according to the present invention prevents marine organisms such as shellfish from adhering to and breeding on water intake pipes, drainage pipes, and the various structures described above. It can be almost completely prevented over a long period of time, and it is safe because it does not contain toxic components that dissolve in seawater. Moreover, the parts of the structure that come into contact with seawater are covered with sheets (
5) can be easily and inexpensively implemented.

In addition, the method according to the present invention remains effective as long as the bristles (4) do not fall off or the sheet (5) peels off, so it has excellent durability. It can be easily applied to structures such as drainage pipes and other equipment, and it also has the excellent effect of not increasing the burden on existing equipment by attaching it.

[Brief explanation of the drawing]

1 to 4 show an example in which the method according to the present invention is applied to a water suction pipe. Figure 2 is a front view of the water absorption pipe with its tip connected to its base, Figure 3 is a partial enlarged sectional view of the area near the opening of the L-shaped part, and Figure 4 is a partial enlarged view showing the fixed part of the sheet. Cross-sectional view (1)...Tip of water suction pipe (2)...
Straight line part (3)... L-shaped part (4)...
- Hair (5)...Sheet (6)...Base of water absorption pipe (15)...Permanent magnet (16)...Notch

Claims (1)

[Claims] 1. Attachment of marine life characterized by attaching a sheet with dense white or green mink-like hairs on the surface to the part of the structure that comes into contact with seawater, with the hairs facing the seawater side. How to prevent it. 2. The method according to claim 1, wherein the sheet is a boa cloth made by raising the surface of a polyester cloth. 3. The method according to claim 1 or 2, further comprising embedding a magnet near a portion of the structure that comes into contact with seawater.