JP2002294651A - Underwater organism adhesion prevention tool and underwater organism adhesion prevention method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent underwater organisms from adhering to an object for a long period of time without requiring complicated work. SOLUTION: The underwater organism adhesion preventing tool 4 of the present invention is one in which a rubber rope 6 is attached to eyelets 5a on both sides of one flexible sheet 5. Both sides of the flexible sheet 5 are connected by the rubber rope 6 in a state where the floating body 3 is covered, and the underwater organism adhesion preventing tool 4 is attached to the floating body 3.
The flexible sheet 5 is made of a polyolefin-based resin to which organisms in water hardly adhere. When some underwater creatures adhere, the flexible sheet 5 is detached from the floating body 3 by extending the rubber rope 6 or detaching from the eyelet 5a. And
By stretching, bending or kneading the flexible sheet 5 flat, the attached underwater organisms can be easily removed. After removing the deposits, the flexible sheet 5 is attached to the floating body 3 again using the rubber rope 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing underwater organisms from adhering to an underwater organism such as seaweed, algae, or shellfish attached to an object at least partially located in water. The present invention relates to a tool and a method for preventing underwater organisms from adhering.

[0002]

2. Description of the Related Art Conventionally, in order to hold a fish and fish culture basket at an appropriate position in water, a rafting basket attached to a culture basket is used. On such a raft, a floating body made of Styrofoam etc. is attached,
It is kept floating on the water.

[0003] The floating body includes an underwater organism (for example, moss,
Floating bodies lose weight and buoyancy, making it difficult to float on water. It may not be possible to hold the position.

[0004] Not only such floating bodies, but also for marine development such as mooring and towing of ships, partitioning of bathing beaches, mining of offshore oil fields and sampling of offshore minerals, and use of seawater for cooling water. In various fixed or movable objects at least partially located in the water, for example, for preventing foreign substances from entering the water intake facility and supporting various facilities, the presence of the attached matter may be a problem. In these objects, organisms (for example, moss, pods, bivalves, sea squirts, algae, etc.) tend to adhere to the surface of the portion that is always in contact with water, resulting from an increase in weight, etc. Various problems are likely to occur.

[0005]

In order to prevent such aquatic organisms from adhering, use of an antifouling agent such as an organotin compound or a metal salt of pentachlorophenol has been proposed. However, these are toxic substances, which raise new problems such as fish toxicity and marine pollution. In addition, such a method still has many problems, for example, the effect of preventing the adhesion of underwater organisms is not maintained for a long time.

Also, in order to prevent the attachment of underwater organisms,
There is a configuration in which an object is covered with a bag-shaped cover. This cover
It consists of a sheet material generally called a blue sheet, an orange sheet or a canary sheet, that is, a sheet material in which a flat yarn is woven and coated with polyethylene. It is inevitable that some underwater organisms attach to the sea. In that case, while the object is still covered, the attached matter on the cover can be removed manually, but at that time, there is a high possibility that the cover will be damaged. If the cover is partially damaged, the repair is rarely performed, and the dissolution by the oil proceeds from the damaged portion, and the underwater organisms are more easily attached. After all, the object itself often has to be replaced. In addition, since the cover has a bag shape that wraps the object, the operation of removing the cover from the underwater object is not easy and is very complicated. In particular, when an underwater object is attached to another member, the cover cannot be removed unless this object is removed from the other member. Regardless of whether or not the cover is removed from the object, it is inefficient and irrational both in terms of economy and labor.

[0007] An object of the present invention is to provide an aquatic organism that can prevent the attachment of aquatic organisms for a long period of time without requiring complicated operations, and is free from the risk of underwater contamination due to elution of harmful substances and the like. An object of the present invention is to provide an adhesion preventing device and a method for preventing underwater organisms from adhering.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an underwater organism attachment preventing device which is attached to an object at least partially located in water and suppresses the attachment of underwater organisms to the object.
A flexible sheet that covers a portion of the outer periphery of the object that is located in water and that is detachable from the object is included.

According to this, by covering with the flexible sheet, it is possible to prevent underwater organisms from adhering to the object.
Unlike the bag-shaped cover, the flexible sheet is very easy to remove from an object, has no risk of breakage, and can be used for various objects in general.

It has a rope-like member connecting both sides of the flexible sheet. The flexible sheet can be attached to an object by tightening the rope-like member, and the flexible sheet can be attached by loosening the rope-like member. Preferably, the sheet is removable from said object.

When the flexible sheet is made of a polyolefin-based resin, the effect of preventing underwater organisms from adhering is large.

[0012] Further, the method for preventing underwater organisms from adhering according to the present invention comprises:
After removing the flexible sheet from the object using the underwater organism adhesion preventing device having the above-described configuration, the flexible sheet is bent and deformed to change the curved state, thereby removing the attached matter of the flexible sheet and removing the attached matter. After that, the flexible sheet is attached to the object again.

According to the present invention, even if an adhered substance is formed on the flexible sheet, the extraneous substance can be removed very simply by removing it from the object and slightly rubbing or rubbing the flexible sheet. In addition, it can be attached to the object again after removing the attached matter, and the underwater organism attachment preventing device can be effectively used for a very long time.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a raft 2 to which a cage 1 for aquaculture of fish and shellfish is attached. The raft 2 has a large number of floating bodies 3, which float on water by the buoyancy of the floating bodies 3, and hold the cage 1 for aquaculture at an appropriate position. Each underwater body 3 is provided with the underwater organism adhesion preventing tool 4 of the present invention.

FIG. 2 is an enlarged view of the floating body 3 and the underwater organism adhesion preventing tool 4, and FIG. The underwater organism attachment preventing device 4 includes one flexible sheet 5.
And both sides of the flexible sheet 5 are bent to provide eyelets 5a. Each end of the rubber rope 6 is attached to the eyelet 5a on each side, and both sides of the flexible sheet 5 are connected by the rubber rope 6. In a state where the floating body 3 is covered, the both sides of the flexible sheet 5 are connected by the rubber rope 6, so that the underwater organism adhesion preventing tool 4 is attached to the floating body 3 as shown in FIG. 2. At this time, the flexible sheet 5 covers the side of the floating body 3 located in the water, and the rubber rope 6 is located on the side exposed on the water surface.

According to the present embodiment, since the sheet 5 has flexibility, it can be covered according to the outer shape of the floating body 3, and the rubber rope 6 has elasticity, regardless of the size of the floating body 3. It can be covered tightly. Further, by stretching the rubber rope 6 using elasticity or detaching it from one eyelet 5a, the flexible sheet 5 can be easily removed from the floating body 3 without damaging the flexible sheet 5.

The flexible sheet 5 is made of a polyolefin-based resin and is hardly adhered to aquatic organisms. However, if the flexible sheet 5 is located in water for a long period of time, some adherence of aquatic organisms is observed. . In this case, as described above, the flexible sheet 5 is removed from the floating body 3 by extending the rubber rope 6 or detaching the rubber rope 6 from the eyelet 5a. Then, by changing the curved state of the flexible sheet 5, that is, by making the flexible sheet 5 flat, bend, or rub, the attached underwater creatures can be easily removed. I can pay. Since the sheet 5 has flexibility, even if such a process is performed, it will not be damaged. After removing the deposits, the flexible sheet 5 is attached to the floating body 3 again using the rubber rope 6 and the floating body 3 is returned to the water, whereby the effect of preventing the underwater organisms from being adhered is obtained again. In the present embodiment, since the flexible sheet 5 is formed of a polyolefin-based resin which is a material having an effect of preventing underwater organisms from adhering, the flexible sheet 5 can be variously deformed or rubbed. The biofouling prevention effect does not deteriorate.

As described above, the material of the flexible sheet 5 is not a monomer having a hetero atom such as oxygen, nitrogen, sulfur, or chlorine in the substituent of the monomer, but is a simple substance made of only hydrocarbon. A polyolefin resin composed of a polymer obtained by polymerizing a non-polar monomer is used. Underwater organisms adhere considerably to a synthetic resin having a polar group, whereas underwater organisms are less likely to adhere to a flexible sheet 5 made of a polyolefin resin having no polar group.

Preferred polyolefin resins include:
Low, medium, high density homopolymers such as polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, and other α containing ethylene or propylene as a main component.
And polyolefin-based resins such as copolymers with olefins, and mixtures thereof. Among them, the use of polypropylene or high-density polyethylene is preferred. Adopting polypropylene having a relatively small change in shape in terms of creep phenomenon due to continuous compressive stress or the like can be cited as one of the most preferable ones. Since such a polyolefin-based resin is easily deteriorated, it is preferable to add a deterioration inhibitor such as an ultraviolet absorber, a light stabilizer and an antioxidant. Further, other additives such as a coloring agent may be contained.

The thickness of the flexible sheet 5 is preferably 200 μm or more.

Incidentally, as shown in FIG.
a, that is, the surface substantially perpendicular to the water surface is not covered with the flexible sheet 5, but since it is empirically known that underwater creatures do not adhere much to the end surface 3a, It does not matter.

In this embodiment, the rubber rope 6 is used as the rope-shaped member. However, the present invention is not limited to this, and a rope or a chain that does not expand and contract can be used. Of course, a rope-shaped member made of a material other than rubber can also be used. Further, the flexible sheet 5 is moved to the object (the floating body 3) by some means other than the rope-shaped member.
It may be configured to be attached to this with part of it covered.

In this embodiment, the floating body 3 of the raft 2 is exemplified as an object to which the underwater organism adhesion preventing tool 4 is attached, but the present invention is not limited to this. Floating bodies such as buoys, fixed members such as buildings, large objects such as ships and piers, including at least a part of any object that is located in water, the underwater organism adhesion prevention device of the present invention can be used. It is valid. The size, shape, material, application, and the like of the object are not limited at all.

The conventional bag-shaped cover needs to be tightly attached to an object without any gap in order to prevent underwater organisms from adhering. Therefore, it is necessary to use a special cover in accordance with the size and shape of the object to be attached. is there. However, the flexible sheet 5 of the present embodiment can be tightly attached to various objects without gaps by the flexibility of the sheet 5 and the adjustment of the rope-shaped member (such as the rubber rope 6). Can be widely used. The underwater organism adhesion preventing device 4 of the present invention can be attached later to an existing object already placed in the water.

[0026]

By covering an object at least partially located in water with a flexible sheet, it is possible to prevent underwater organisms from adhering to this object. In particular, when the flexible sheet is made of a polyolefin resin, the effect of preventing underwater organisms from adhering is large.

This flexible sheet, unlike a bag-shaped cover or the like, is very easy to remove from an object and has no risk of breakage. And even if an attached matter is generated on the flexible sheet, the attached matter can be removed extremely simply by removing it from the object and slightly rubbing or rubbing the flexible sheet. In addition, it can be attached to the object again after removing the attached matter, and the underwater organism attachment preventing tool can be effectively used for a very long time. Further, the underwater organism adhesion preventing device can be used for various objects in general. Therefore, the present invention has a remarkable effect in terms of both cost and working efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a raft having a floating body to which an embodiment of the underwater organism adhesion preventing device of the present invention is attached.

FIG. 2 is a schematic perspective view showing a state in which one embodiment of the underwater organism adhesion preventing device of the present invention is attached to a floating body.

FIG. 3 is a schematic perspective view showing an embodiment of the underwater organism adhesion preventing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Culture basket 2 Raft 3 Floating body (object) 3a End surface 4 Underwater organism adhesion prevention tool 5 Flexible sheet 5a Eyelet part 6 Rubber rope (rope-shaped member)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B63B 35/58 B63B 35/58 59/04 59/04 D

Claims (4)

[Claims] 1. An underwater organism attachment preventing device which is attached to an object at least partially located in water and suppresses the attachment of underwater organisms to the object, covering a portion of the outer periphery of the object located in water. And a flexible sheet that is detachable from the object. And a rope-shaped member for connecting the both sides of the flexible sheet. The flexible sheet can be attached to the object by tightening the rope-shaped member, and the rope-shaped member can be attached to the object. The underwater organism attachment prevention device according to claim 1, wherein the flexible sheet is detachable from the object by loosening the flexible sheet. 3. The underwater organism adhesion preventing tool according to claim 1, wherein the flexible sheet is made of a polyolefin resin. 4. An underwater organism adhesion prevention method using the underwater organism adhesion prevention device according to claim 1, wherein the flexible sheet is bent and deformed after the flexible sheet is removed from the object. A method for preventing underwater organisms from adhering, comprising: removing the deposits on the flexible sheet by changing a curved state of the flexible sheet; and attaching the flexible sheet to the object again after removing the deposits.