JP2001178304A - Structure for artificial fishing bank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for artificial fishing bank capable of promoting the propagation of algae without causing sinking onto a sandy place and designed to swing according to the movement of tidal currents, thereby promote the oxygen supply to the alga and realize an optimal environments. SOLUTION: This structure for artificial fishing bank by thick growing if the alga on the surface of carbon fiber bundles 7 is constructed by making plural wire ropes 2 reach the sea bottom with sinkers 1 and having floats 3 attached thereto, connecting the wire ropes 2 with shape holding stays 4 so as to respectively form polygonal corners and handing the carbon fiber bundles 7 from each net 5 provided in the stays 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish reef installed in, for example, a river or ocean, and more particularly to an artificial reef structure which is excellent in algae reproduction and can maintain a high fish collecting property for a long period of time.

[0002]

2. Description of the Related Art In most cases, artificial reefs installed in the ocean and the like are constructed naturally on the seabed by throwing, for example, blocks of concrete blocks, metal waste materials, and waste tires into the sea. Artificial reefs made of such materials form a space such as a block in the seawater, propagate algae on the surface, promote the growth of animal and phytoplankton, and serve as a fish feeding ground. It is something to offer. In particular, in the case of using a concrete block, not only a molded product but also a block of construction waste material can be used, so that there is an advantage that it can be constructed at low cost.

[0003]

However, concrete blocks and metal waste materials are rigid and heavy. For this reason, it is easy to sink into the sandy ground by its own weight after setting it down to the sea floor, and the area where algae grows becomes small, so that it can not play a sufficient role as a fish reef. In the case of using waste tires, although they have some flexibility, they similarly sink in sand due to scouring due to their weight and flow near the seabed. Further, since the blocks are constructed by randomly throwing the blocks into the sea, the distribution density and the degree of overlap of the blocks become non-uniform, so that a portion where algae are generated is restricted, and the algae bloom distribution is also affected.
Furthermore, artificial reefs in which a large number of blocks are piled up have a shallow water depth, which may cause grounding of fishing boats and the like.

In the case where concrete, metal, tires and the like are used as materials, biochemical implantation and reproduction of algae are not sufficiently promoted, and stable algae growth cannot be obtained.
For this reason, it is inferior in the flora of algae sufficient to attract animal and plant plankton and fish, and impairs the function as a fish reef.

[0005] As described above, the conventional artificial reef has a rigid structure as a whole, so that it is inevitable to sink into the sand, and there is no movement due to the tidal current. In addition, since waste materials are mainly used, there is a problem that the environment for implantation and growth of algae via bacteria is not sufficient.

Therefore, the present invention provides an artificial environment that can realize an optimal environment by promoting the supply of oxygen to algae by preventing subsidence in sandy land, promoting the growth of algae, and oscillating in accordance with the movement of the tide. The purpose is to provide a reef structure.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a method for forming a space between three or more vertical wires directly or indirectly attached to a water bottom, a float connected to each of the vertical wires, and the vertical wires. A shape-retaining wire that is connected and can be shaped into a polygonal planar shape having these vertical wires as corners, and a carbon fiber bundle disposed in a polygonal region formed by the vertical wire and the shape-retaining wire And characterized by the following.

In this configuration, the vertical wire rises vertically from the bottom of the water due to the buoyancy of the float, and the carbon fiber bundle in the polygonal region maintained and maintained by the shape-retaining wire is immersed in the river or the sea. It can be a fish reef, and the growth of algae can be promoted by the high adsorption of bacteria by the carbon of the carbon fiber bundle.

In the above configuration, a mooring wire for mooring the vertical wire to the bottom of the water may be provided, and the mooring wire may have a length that sags downward when the vertical wire is in a vertical posture.

In this configuration, the upper end of the vertical wire on the water surface side is a free end, and the vertical wire freely swings even when moored by the mooring wire. Therefore, the carbon fiber bundles arranged in the vertical wire and the shape-retaining wire also swing according to the flow of water, and the grown algae can be easily brought into contact with oxygen in the water, and the growth of the algae can be promoted. .

[0011] The shape retaining wire may be provided with a net extending substantially over the entire area of the polygon, and a plurality of the carbon fiber bundles may be suspended from the net. In this configuration, since a plurality of carbon fiber bundles are provided, the growth area of algae can be increased.

Further, a weight may be attached to the lower end of the carbon fiber bundle. In such a configuration, even when the carbon fiber bundle swings, the weight of the weight causes the carbon fiber bundle to be restrained in a substantially vertical posture. Damage can be prevented, and rocking can be further promoted in accordance with the flow of water, so that contact with oxygen in water can be more effectively performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view when the artificial reef structure of the present invention is installed in the sea, and FIG. 2 is a schematic plan view taken along line AA of FIG.

In the figure, a wire rope 2 is connected as a vertical wire in this embodiment to three sinkers 1 which are arranged on the sea floor so as to be vertices of an equilateral triangle, respectively. The spherical floats 3 are fixed integrally at substantially constant intervals.
The floats 3 arranged at the same height are connected by three stays 4 having a certain mechanical strength and elastically deforming as shown in FIG. The stay 4 constitutes the shape-retaining wire of the present embodiment, and is made of synthetic resin or hard rubber having an appropriate outer diameter. And, as long as there is no excessive external force,
As shown in FIG. 2, the float 3 has a function of keeping the shape of the triangle in a plane having the apex. Two small-diameter auxiliary floats 3 a are fixed to the stays 4, respectively, and a grid-like net 5 is developed and attached between the stays 4. The net 5 may be a deformable resin net.

In the illustrated embodiment, the stay 4 is in the horizontal direction with respect to the wire rope 2 in the vertical posture.
It may be inclined obliquely. In short, stay 4
It is sufficient that the wire rope 2 is attached so as to form a polygonal planar shape so that each of the wire ropes 2 becomes a corner.

The wire rope 2 whose base end is connected to the sinker 1 rises in the vertical direction by the buoyancy of the float 3 attached to itself and the auxiliary float 3a provided on the stay 4. Therefore, by making the length of the wire rope 2 appropriate, the wire rope 2 can be extended from the seabed X to the sea surface Y as shown in FIG. In order to maintain the posture of the wire ropes 2, several (two in the example of FIG. 1) mooring lines 2a are provided on each of the wire ropes 2, and the mooring lines 2a are fixed to the sea floor by landing on the sea floor. . In addition, this mooring cable 2
a also uses a wire rope having an appropriate outer diameter.

A buoy 6 is integrally provided at the upper end of the wire rope 2. The buoy 6 has an indicator light 6a at its upper end, and incorporates a speaker (not shown) for oscillating sound waves for promoting the growth of algae attached to the carbon fiber material, which will be described later, and a power supply. The loudspeaker is installed in a part submerged in the sea, and the power supply is operable using, for example, tide level, wave power or sunlight as an energy source.

FIG. 3 is a schematic perspective view of a main part showing the portion of the net 5. As shown, a plurality of carbon fiber bundles 7 are suspended from the net 5 by using the stitches. The carbon fiber bundle 7 is formed by combining a plurality of thin carbon fibers into a single bundle. The lower end of the carbon fiber bundle 7 has an appropriate weight for urging the carbon fiber bundle 7 downward to promote the swaying movement due to the tide and the like. The weight 7a is attached integrally. The carbon fibers in the carbon fiber bundle 7 are carbon fibers in a fiber bundle shape obtained by firing organic fibers or pitch-based carbon fibers obtained by spinning pitch and then firing. Carbon materials are known to be capable of adsorbing large amounts of organic matter in water. For example, compared to plastics-made contact materials, the ability to adsorb microorganisms contained in water is remarkably excellent. Therefore, the bacteria in the sea are easily adsorbed, and the generation and growth of algae are promptly promoted.

In the above configuration, the three wire ropes 2 connected to the sinker 1 and supported by the mooring lines 2a are provided with the buoyancy of the float 3, the auxiliary float 3a and the buoy 6 as shown in FIG. Take a posture that extends to a vertical posture. When the tide level falls, the buoy 6 also descends. If the tide level is higher than the level of the float 3 of the second stage from the top, the part between the float 3 of the second stage and the float 3 of the uppermost stage Wire rope 2 is loosened. That is, even if there is a change in the tide level, only the wire rope 2 is slackened and deformed. The higher the tide level, the more the interval between the upper and lower nets 5 increases, and the lower the tide level, the narrower the interval.
Accordingly, the level of the upper end net 5 changes every moment in response to the change of the tide level, and the carbon fiber bundle 7 attached to this net 5 moves up and down.

On the other hand, since the three wire ropes 2 are connected by the stay 4 having shape retention, a space in which the carbon fiber bundle 7 is suspended is formed in the triangular area shown in FIG. Since bacteria are easily adsorbed to the carbon fibers of the carbon fiber bundle 7, algae grow on the surface thereof. Therefore, the inside surrounded by the wire rope 3 and the stay 4 becomes a fish collecting space, and can serve as a fish reef. Algae overgrowth is much higher than that using blocks of concrete or metal lumps, making it ideal for animal and plant plankton and fish feeding grounds.

Here, the artificial reef structure of the present invention is designed to be able to handle from a shallow water depth to about 100 to 200 m. The length of the wire rope 2 and the arrangement pitch of the nets 5 according to the water depth at the site. I do. The example of FIG.
It is assumed that the water depth is 200 m. At such a large water depth, the velocity profile of the tidal current varies depending on the depth. In other words, as shown by the velocity profile on the left side of the figure, the tidal velocity at the sea bottom is close to zero, but it does not increase uniformly toward the sea surface, but rather has a fast and slow tide depending on the depth. Divided into Even in the case of such a change in tide, the artificial reef using conventional concrete blocks, etc., is heavy and rigid, so it sinks into the sand, but the relative position and posture between the blocks are It will not change.

On the other hand, in the present invention, when the velocity profile of the tide shown by the arrow shown on the left side in FIG. 4 is used, the wire rope 2 deforms and swings in accordance with this velocity profile. That is, although the base end of the wire rope 2 is connected to the sinker 1, the upper end to which the buoy 6 is attached is a free end. In addition, the mooring line 2a is not of such a length that the wire rope 2 is tensioned when the wire rope 2 is in the vertical posture,
It is landed on the seabed as a slack length as shown in Fig. Therefore, the wire rope 2 is deformed together with other members into a shape shown by a dashed line in FIG. 4, and always swings according to the velocity distribution of the tide in the sea. Therefore, when there is a movement of the tide, the carbon fiber bundle 7 held by the net 5 does not stop at a fixed position in the sea, but moves around actively and comes into contact with the oxygen contained in the seawater. In addition, weight 7
This vibration is also promoted by a, and the contact with oxygen is further promoted. Therefore, the growth of algae on the surface of the carbon fiber bundle 7 is effectively promoted, and a more optimal environment as a fish reef can be realized.

In the above example, the fish reef space has a triangular cross-section formed by the three wire ropes 2 and the stays 4. Either may be used. In addition, although the description has been made as an artificial reef installed in the sea, it is a matter of course that the present invention can be applied to a river or a farm.

[0024]

According to the present invention, a fish reef space can be always maintained without submerging in sandy ground at the bottom of the water, so that it can be used for a long period of time, and a carbon fiber bundle which can easily adsorb bacteria. Is contained in the fish reef space, an environment suitable for the generation and growth of algae can be obtained, and a more optimized artificial reef can be obtained.

Further, since the vertical wire rods are swayed by the tidal current or the like while keeping the shape, the degree of contact of the carbon fiber bundle with oxygen in the water is increased, and the propagation of algae can be further promoted. Can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the entire artificial reef structure of an embodiment.

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG.

FIG. 3 is a schematic perspective view showing a main part of a net and a carbon fiber bundle suspended from the net.

FIG. 4 is a schematic diagram showing a shaking motion of a fish reef due to a tide in the sea.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sinker 2 Wire rope (vertical wire) 2a Mooring line 3 Float 3a Auxiliary float 4 Stay (shape retaining wire) 5 Net 6 Buoy 6a Indicator light 7 Carbon fiber bundle 7a Weight

Claims (4)

[Claims] 1. A method of directly or indirectly landing on a water floor.
More than one vertical wire, a float connected to each of the vertical wires, and a shape-preserving wire capable of maintaining a shape in a polygonal planar shape having a connection between the vertical wires and corners of these vertical wires. An artificial fish reef structure comprising: the vertical wire and a carbon fiber bundle disposed in a polygonal region formed by the shape-retaining wire. 2. An artificial reef according to claim 1, further comprising a mooring wire for mooring the vertical wire to the bottom of the water, wherein the mooring wire has a length that sags downward when the vertical wire is in a vertical posture. Construction. 3. The shape-retaining wire is provided with a net that extends over substantially the entire area of the polygon, and a plurality of the carbon fiber bundles are suspended from the net and arranged. The artificial reef structure described. 4. The artificial reef structure according to claim 3, wherein a weight is attached to a lower end of the carbon fiber bundle.