JPH09107843A - Artificial fishing bank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial fishing bank capable of readily forming a fishing bank on the sea bottom and lake bottom and readily attaching water grass including sea grass and algae. SOLUTION: In this artificial fishing bank attaching a concrete block 16 to a member for attaching water grass including sea grass, algae, etc., a net body formed by fixing intersections of string-like bodies 10 made of a carbon fiber with a block-like resin mass 12 wider than the string-like body 10 and composed of a resin having a specific gravity smaller than that of water is used as the member for attachment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial fishing reef, and more particularly to an artificial fishing reef in which a weight body such as a concrete block is provided on an attachment member to which water plants such as seaweed and algae adhere.

[0002]

2. Description of the Related Art Conventionally, concrete blocks such as tetrapots, plastic blocks, or abandoned ships have been used as artificial fishing reefs to which aquatic plants including seaweed and algae are attached.

[0003]

[Problems to be Solved by the Invention] According to such an artificial fishing reef, when an aquatic plant containing seaweed or algae grows on the artificial reef settled on the seabed or the lake bottom, it becomes an excellent habitat for fish. Can form a fish field. However, in conventional artificial reefs such as concrete blocks, it takes a long time for aquatic plants including seaweed and algae to adhere. In other words, in order for aquatic plants including seaweed and algae to adhere to the artificial reef, it is first necessary for underwater microorganisms to adhere to the surface of the artificial reef. On the other hand, since concrete contains an alkaline component that inhibits adhesion of microorganisms in water, it is difficult for aquatic plants including seaweed and algae to adhere to the artificial reef made of concrete. In addition, plastic is poor in bioadhesiveness, which shows the degree of adhesion of microorganisms in water, and it is difficult for aquatic plants including seaweed and algae to adhere to the plastic. Furthermore, abandoned vessels, etc. require complete removal of harmful substances such as heavy oil contained in the hull before sedimentation, which makes it difficult to form fishing reefs and interferes with the navigation of vessels depending on the location of sedimentation. May be. Therefore, an object of the present invention is to propose an artificial fishing reef that can easily form a fishing reef on the seabed or a lake bottom and to which aquatic plants including seaweed and algae easily adhere.

[0004]

In order to solve the above-mentioned problems, the present inventor first examined an object having a high bioadhesion rate, and found that carbon fiber was compared with a structure made of plastic or concrete. , Found that it has a high biofouling rate. Therefore, the present inventor considered covering the surface of the plastic artificial reef with carbon fiber, but it was found that it is difficult to mold and handle the plastic artificial reef with the surface covered with carbon fiber. did. On the other hand, if it is possible to extend a string-like body made of carbon fiber having a specific gravity larger than that of water from the seabed or lake bottom into the water like seagrass or aquatic plants, it is possible to easily form an artificial fishing reef made of carbon fiber having a high biofouling rate. The present invention has been reached as a result of an examination based on the idea. That is, the present invention, in an artificial fishing reef in which a weight body such as a concrete block is provided to an attachment member to which aquatic plants including seaweed, algae, etc. are attached, a string-shaped body made of carbon fiber is used as the attachment member. The weight body is provided on one end side of the string-like body, and the other end side of the string-like body floats up in water so that the other end side of the string-like body is made of resin having a smaller specific gravity than water. An artificial fishing reef characterized in that a block-shaped resin block is provided.

In the present invention having such a construction, as an attachment member constituting an artificial fishing reef, a block made of a resin having a cross point of a string-like body made of carbon fiber wider than the string-like body and having a smaller specific gravity than water. By using the net body formed by fixing with resin-like resin lumps, it is possible to settle a string-like body composed of many carbon fibers at once to the seabed or lake bottom, and facilitate handling such as transportation of artificial fishing reefs. can do. In addition, the shape retention of the string-shaped body can be improved by intertwining at least some of the monofilaments made of carbon fibers that form the string-shaped body.

According to the present invention as described above, a cord-shaped body made of carbon fiber having a higher bioadhesion rate than plastics,
It can extend from the seabed or lakebed into the water, like seagrass or aquatic plants in water. Therefore, microorganisms in the water can easily attach to the string-like body extending from the seabed or the lakebed into the water,
Water plants and algae including seaweed are more likely to adhere. Further, in the artificial fishing reef according to the present invention, the weight body is provided on one end side of the string-like body, and the block-shaped resin mass made of resin having a smaller specific gravity than water is provided on the other end side of the string-like body. Since the structure is simple and the weight can be reduced as compared with the artificial reef made of concrete, the handling property of the artificial reef can be improved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The artificial fishing reef according to the present invention is provided with a heavy weight body made of concrete or the like that sinks to the seabed or the lake bottom at one end side of the stringy body made of carbon fiber. A block-shaped resin block made of a resin having a specific gravity smaller than that of water is provided on the other end side of the string-like body so that the other end side thereof floats in water. The carbon fiber used in the present invention may be either pitch-based carbon fiber or PAN-based carbon fiber, and may be in the form of long fibers or short fibers. Fibrous carbon fibers are preferred. In the string-shaped body made of such carbon fibers, at least some of the single fibers constituting the string-shaped body are entangled with each other, which can improve the shape retention of the string-shaped body,
It is preferable because handling property such as transportation can be improved.

Such a weight body provided on one end side of the string-like body is not of course capable of sinking to the sea floor or lake bottom, and is not turned or carried by ocean currents or waves. Preferably. As such a weight body, a single structure made of concrete or plastic may be used, which is a combination of a concrete structure and a plastic structure such that concrete blocks are formed at four corners of a plastic frame. It may be. Further, on the other end side of the cord-shaped body, a block-shaped resin mass formed of a resin having a smaller specific gravity than water is provided.
Therefore, the other end of the string-like body can float up in the water. As the resin having a specific gravity smaller than that of water, a polyethylene resin or a polypropylene resin, which has excellent water resistance and can be injection-molded, is preferable. In order to increase the buoyancy of the block-shaped resin block, bubbles or the like may be formed in the block-shaped resin block. However, air bubbles shall have a confidential structure so that water will not enter inside due to water pressure when artificial reefs are put into the sea or lake. The length of the string-shaped body is preferably adjusted according to the depth of water at the settling place where the artificial fishing reef is settled.

In such an artificial fishing reef according to the present invention, a string of carbon fibers can be settled on the seabed or lake bottom at a time, and the handling of the artificial fishing reef is facilitated. Therefore, as shown in FIG. 1, a net may be used. In this mesh body, the intersections of the string-shaped bodies 10 made of carbon fibers forming the square mesh 14 are fixed by the block-shaped resin block 12 made of a resin wider than the string-shaped body 10 and having a smaller specific gravity than water. It is a thing. This block-shaped resin block 12
Can be made of polyethylene resin or polypropylene resin, and bubbles or the like may be formed inside to improve buoyancy. It is preferable that such bubbles and the like have a sealed structure so that water does not enter in water. Further, a concrete block 16 as a weight body is attached to the lower end side of the net body. When the artificial fishing reef shown in FIG. 1 is thrown into the sea or lake, the concrete block 16 sinks to the bottom of the sea or the lake, fixing the artificial fishing reef in place. On the other hand, the net body extends in the water surface direction by the buoyancy of the block-shaped resin block 12.

On the artificial fishing reefs shown in FIG. 1 which have been put into the sea or lake, the water-borne microorganisms such as seaweed and algae adhere in a short time because the microorganisms in the water easily adhere to the carbon fibers forming the string 10. You can By the way, in the net body shown in FIG. 1, as the square mesh 14 surrounded by the string-like body 10 is narrower, aquatic plants including seaweed, algae and the like are more likely to adhere in a short time, but are easily affected by ocean currents and waves. There is a risk that artificial reefs may be diverted or carried by ocean currents and waves. Therefore, it is preferable to adjust the size of the mesh 14 surrounded by the string-shaped body 10 according to the strength of the ocean current, waves, etc. at the place where the artificial reef sinks. The adjustment of the mesh 14 of the mesh is easier as the shape retention of the string-shaped body 10 forming the mesh 14 is better. This is because the size of the mesh 14 can be ensured even in water. The improvement in the shape retention of the string-shaped body 10 can be achieved by intertwining at least some of the carbon fibers forming the string-shaped body 10 with each other.

As described above, the net body formed by the string-shaped body 10 in which at least some of the monofilaments made of carbon fibers are entangled with each other is made of carbon fibers and at least some of the monofilaments are entangled. And retains the sheet form,
It is preferable to manufacture using a non-woven fabric sheet body in which the entanglement points between the single fibers are substantially unfixed. Such a non-woven sheet body can be obtained by subjecting a web in which long fibers and short fibers made of carbon fibers are gathered in a futon cotton shape to a simple needle punching process to give entanglement between the single fibers. The obtained non-woven sheet body can maintain the sheet-like shape because of the entanglement between the single fibers. However, the entanglement mechanically imparted between the single fibers by a needle punch or the like is such that the entanglement points are substantially unfixed. Therefore, the entanglement points between the single fibers can move on the single fibers by applying a force.

In this way, holes are opened in the non-woven fabric sheet body in which the entanglement points between the single fibers can be moved by applying the force so that the single fibers are scraped off. When the single fibers are scraped off, the entanglement points between the single fibers can move on the single fibers, so that holes can be opened without cutting the single fibers as much as possible. By providing a plurality of such holes in the non-woven sheet body, the net body shown in FIG. 2 can be obtained. The net body of FIG. 2 has substantially the same shape as the net body of FIG. 1 except for the block-shaped resin blocks 12, 12, ... Shown in FIG. 1 (in FIG. 2, the net body is shown in a smaller scale than that of FIG. 1). ). That is, the hole 24 shown in FIG. 2 has substantially the same size as the mesh 14 of the net body shown in FIG. 1, and the partition portion 20 between the hole 24 and the hole 24 is the string of the net body shown in FIG. It corresponds to the shape body 10.

The partition 20 of the mesh-like body shown in FIG.
, The entanglement points between the monofilaments are movable on the monofilaments, so that the shape of the holes 24 is unstable. At this point, as shown in FIG. 3, the intersection of the partitioning portions 20 forming the holes 24 of the net is
A block-shaped resin block 12 made of a resin that is wider than the partition 20 and has a smaller specific gravity than water is formed and fixed to the hole 2
The shape of 4 can be stabilized. Here, when the block-shaped resin mass 12 is narrower than the partition part 20, the shape of the intersection of the protruding partition parts 20 is likely to be unstable, and the buoyancy of the block-shaped resin mass 12 is likely to be small. The block-shaped resin block 12 shown in FIG. 3 can be easily formed by discharging the polyethylene resin or polypropylene resin melted in the injection cylinder from the nozzle toward the intersection of the string-shaped bodies 10. The block-shaped resin block 12 may have a spherical shape or a rectangular shape. Further, the polyethylene resin or polypropylene resin forming the block-shaped resin block 12 may be a melt of waste plastic.

[0014]

EFFECTS OF THE INVENTION According to the present invention, an artificial fishing reef to which aquatic plants including seaweed and algae are likely to adhere can be easily settled on the seabed or lake bottom. Therefore, the place where the artificial reef according to the present invention is settled becomes a suitable habitat for fish, and an excellent fish field can be formed.

[Brief description of the drawings]

FIG. 1 is a partial perspective view for explaining an example of an artificial fishing reef according to the present invention.

FIG. 2 is a partial front view for explaining the method for manufacturing the net body shown in FIG.

FIG. 3 is a partial front view for explaining the method for manufacturing the net body shown in FIG.

[Explanation of symbols]

 10 String-like body 12 Block-shaped resin block 14 Mesh 16 Concrete block (weight body) 20 Partition part 24 holes

Claims (3)

[Claims] 1. An artificial fishing reef in which a weight body such as a concrete block is provided on an attachment member to which aquatic plants including seaweed, algae, etc. are attached, and a string-shaped body made of carbon fiber is used as the attachment member. While the weight body is provided on one end side of the string-like body, the other end side of the string-like body floats up in water,
An artificial fishing reef characterized in that a block-shaped resin block made of a resin having a smaller specific gravity than water is provided on the other end side of the string-shaped body. 2. A net formed by fixing, as an attachment member, an intersection of a string-shaped body made of carbon fiber with a block-shaped resin block made of a resin wider than the string-shaped body and having a smaller specific gravity than water. The artificial reef according to claim 1, wherein the body is used. 3. The artificial fishing reef according to claim 1 or 2, wherein at least some of the monofilaments made of carbon fibers constituting the string-like body are entangled with each other.