JPH01256615A - Method for preventing deposit of ocean life - Google Patents

Abstract

PURPOSE:To prevent a structure from deposit of ocean life like shells by mounting a sheet having mink-like hair closely planted on the surface on a portion of the structure contacting sea water. CONSTITUTION:Sheets 5 having mink-like hair closely planted on the surface are mounted on the straight portion 2 and a L-shaped portion 3 of an end 1 of a water suction pipe embedded in the sea. Since shells particularly tend to be deposited to the proximity of an opening of the pipe, the same sheet 5 is also bonded to the outer surface of the proximity of the opening. Thus, various structures can be prevented from deposition and growth of ocean life like shells for a long time almost completely, simply and economically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing marine organisms such as shellfish such as purple shells, oysters and Fujibbo from adhering to structures in contact with seawater.

[Conventional technology]

Water intake and drainage pipes buried under the sea at sewage and human waste treatment plants are generally made of vinyl chloride, and their surfaces are hard and smooth, so they are highly susceptible to marine life, especially purple shellfish, oysters, etc.
It has a property that makes it easy for larvae of shellfish such as Fujibbo to attach to it. For this reason, if a large number of these larvae attach, grow, and reproduce, the flow rate inside the pipe may decrease, causing problems in operations and processing 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 order to solve this problem, we have developed a ``corrugated steel pipe'' that generates copper ions underwater to kill shellfish larvae.
However, it cannot be used in practice because it contaminates seawater.

The above situation is not limited to water absorption/drainage pipes, but also applies to other structures that come into contact with seawater. For example, storage tanks for crude oil, LPG, etc. floating on the sea, oil fences, buoyant buoys for fish farms, offshore buoys, etc. are usually made of metal, synthetic resin, etc., and their surfaces are coated with rust-proofing paint or antifouling paint. However, since these are used for a long period of time, ranging from several years to several decades, a large amount of the above-mentioned shellfish adhere to the bottom and sides that come into contact with seawater. 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. ing.

In the case of seawater storage tanks such as aquariums, if shellfish adhere to the inner surface of the tank, there is a risk of contaminating the stored seawater.Furthermore, in the case of crude oil absorption pipes and drilling equipment in offshore oil fields, there is a risk of increased weight and damage to the pipes. There are problems with damage to the transducers of fish finders, such as disturbances in electromagnetic waves caused by attached shellfish.

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 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, and it takes a lot of effort to repaint, and it also has the disadvantage of contaminating 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. Another object of the present invention is to provide a method for preventing the adhesion of marine organisms that is simple, inexpensive, and safe.

[Means to solve the problem]

In order to achieve the above object, the present invention takes the following technical measures.

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

As the above-mentioned sheet with mink-like hair densely growing on its surface, any sheet can be used, such as 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 a boa cloth made by raising the surface of a polyester cloth. Further, it is preferable that the bristles stand approximately perpendicular to the surface thereof, and that the bristles are so stiff that they sway to and fro with wave motion.

Further, in order to further increase the effect of preventing shellfish from adhering to the structure, the sheet can be attached and a magnet can be buried near the part of the structure that comes into contact with seawater.

When the structure is a seawater intake pipe or drainage pipe, the above-mentioned sheet is preferably attached to the inner surface near the opening of the water absorption pipe or drainage pipe with the bristles facing inward, and the above-mentioned sheet is also attached to the outer surface of the pipe. - It is preferable to attach the hair with the bristles facing outward.

Also, instead of attaching the above sheet directly, first attach it to the inner surface of another short pipe with the bristles facing inward.
Other pipes can also be connected to the openings of the water intake or drainage pipes. In this case as well, it is preferable to attach the sheet to the outer surface of the other pipe with the bristles facing outward.

[Effect]

It has been found that the larvae of sea creatures such as shellfish floating in the sea have a habit of not attaching to soft surfaces or surfaces with swaying hair. 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 almost completely 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 bonding.

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.
) along the circumferential direction, and the fixing belt (7)
By passing the bolt (9) passed through the hole (8) through the through hole (10) formed in the side wall of the straight portion (2), and tightening it from the outside with a nand (11) via a washer (12), Fixed.

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 mink-like hair flocked on the surface. In this example, the polyester cloth was brushed to prevent it from being sufficiently durable.
(Piled) boa cloth is used. That hair (4)
The length varies depending on the relationship with the diameter of the base (6) of the water suction pipe, but is usually about 1 cm to 1 cm.

It is also preferred that the bristles (4) are substantially perpendicular to the surface of the sheet (5).

Moreover, the color of the hair (4) can of course be any color, but according to experiments, it is best to use 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 at the opening side end of the base (6) of the water suction pipe, and the flange (13) (1
B) and are connected by tightening them with nuts (19).

FIG. 5 shows a connection method when the diameters of the tip (1) and base (6) of the water suction pipe do not match.

In this case, the connection is made via a connecting pipe (20) as shown. The connecting pipe (20) has a flange (13) similar to the flange (13) of the base (6) of the water suction pipe at one end.
21), and the other end is connected to the open end of the water suction pipe (6) by adhesive or the like. Therefore, the flange (13) of the tip (1) of the water suction pipe and the connecting pipe (
It becomes possible to connect the flanges (21) of 20) in the same way as above.

As a result of experiments using the tip (1) of the water absorption pipe configured as 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)
It is clear that if the shell is connected to the open end of the base (6) of the water suction pipe, 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 5 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 suction 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. 5 is an explanatory cross-sectional view showing the state in which the tip of the water suction pipe is connected to the base via the connecting pipe, (al indicates the case where the diameter of the base is smaller, and (b) shows the case where the diameter of the base is smaller. (1) Tip of the water suction pipe (2) Straight section (3) L-shaped section (4) Hair (
5)...Sheet (6)...Base of water suction pipe (15)...Permanent magnet (16)...Notch

Claims (1)

[Scope of Claims] 1. A method for preventing the adhesion of marine organisms, which comprises attaching a sheet with dense 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. 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. 4. The method according to any one of claims 1 to 3, wherein the sheet is attached to the inner surface near the opening of a seawater intake pipe or a drainage pipe with the bristles facing inward. 5. The method according to claim 4, wherein the sheet is also attached to the outer surface near the opening of the water absorption pipe or the drainage pipe, with the bristles facing outward. 6. The method according to any one of claims 1 to 3, wherein the sheet is attached to the inner surface of another short pipe with the bristles facing inward, and the other pipe is connected to an opening of a water intake pipe or a drainage pipe. 7. The method according to claim 6, wherein the sheet is also attached to the outer surface of the other pipe with the bristles facing outward.