JP2003116400A - Artificial fishing bank member, artificial fishing bank unit, method for setting fishing bank unit and artificial fishing bank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial fishing bank suitable for the growth of seaweeds. SOLUTION: This artificial fishing bank member is produced by binding and molding small wood pieces with a plastic (synthetic resin) as a binder in a prescribed shape. The produced artificial fishing bank member is attached to a concrete base or the like and then set to a sea bottom.

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 member and an artificial fishing reef unit installed on the seabed of a shallow sea area near a coast, a method for constructing an artificial fishing reef, and an improvement of an artificial fishing ground using the artificial fishing reef.

[0002]

2. Description of the Related Art In shallow water near the coast where natural conditions are maintained, various seaweeds grow on the seabed, and many fishes, shellfish, corals and the like inhabit. However, seaweed growth is hindered by various constructions in shallow water, such as seawall revetment work, land reclamation, and sea sand collection. The seaweed gradually decreases and eventually disappears. The large-sized seaweeds that form, such as Honda straw, kelp, and many other seaweeds die and become barren, and coral corals (lime algae) are covered with pink hard seaweed with calcium carbonate deposited on the algal bodies. Is increasing) in various shallow waters. Since seaweed has a symbiotic relationship with fish and shellfish, fish and shellfish will not be able to live when rock burning occurs. In order to prevent sea shore burning, it is effective to install artificial reefs (hereinafter simply referred to as “fish reefs”) on the seabed where seaweeds can easily grow and fishes live, and various materials and shapes have been developed. There is. Hereinafter, a typical conventional example of a fishing reef will be briefly described. Japanese Unexamined Patent Application Publication No. 200 of the first conventional example
In the one disclosed in Japanese Patent Application Laid-Open No. 0-300109, a recess and a wedge-shaped lateral groove suitable for habitat of shellfish and corals are provided on the side surface of a concrete block that serves as a seaweed implantation portion for growing seaweed. As a part of concrete aggregate, used iron sand such as foundry sand and iron powder is mixed. As a result, it is possible to obtain a fishing reef that also serves as a reef and is effective in adhering and growing seaweed.

A second conventional example, Japanese Patent Laid-Open No. 2000-31641.
Japanese Patent Publication No. 4 discloses a fishing reef in which a plurality of concrete or steel columns are erected on a concrete bottom plate and an upper plate having the same shape as the bottom plate is provided on the columns. As the top plate or the bottom plate, a concrete plate or a block plate obtained by adding coal ash to waste plastics and solidifying them is used. Further, a concrete upper plate having the above block plate stretched on the upper surface is also shown. JP-A-2000-188 of the third conventional example
No. 996 discloses that a resin mixture having a specific gravity of 0.95 or less is made by mixing wood chips, sawdust, rice husks, etc. into a synthetic resin reclaimed from waste plastic as a main raw material, which is used in an old tire in a liquid state. The fish reef formed by filling and solidifying is shown. In order to reduce the specific gravity of fishing reefs to 0.95 or less, various foaming materials are mixed together with wood chips, sawdust, etc. to foam. Japanese Unexamined Patent Application Publication No. 8-48242
Japanese Laid-Open Patent Publication No. -131016 discloses a fish reef molded product obtained by molding and curing a waste product such as plastic, glass, metal, and mining using a binder of synthetic resin.

[0004]

In the fishing reefs of the first and second conventional examples, the components of the fishing reef made of concrete are in direct contact with seawater. When concrete touches seawater,
The alkaline component in concrete dissolves in seawater. Therefore, the seawater near the surface of the fish reef becomes alkaline, and the attachment of the gametophyte of seaweed is hindered. Therefore, it takes a considerably long time after the fish reef is installed on the seabed until seaweeds and corals adhere and grow and fishes inhabit and function as fish reefs. The third prior art reef is a floating reef whose specific gravity is smaller than that of seawater. The floating reef is installed in the sea or in a state of floating on the surface of the sea, so that the area where it can be installed is limited to the inland sea or the bay where the waves are quiet. In addition, it cannot be installed in a sea area that hinders the navigation of ships. Therefore, its range of use as a fishing reef is extremely narrow. Since the mixture of the synthetic resin, wood chips, sawdust, etc. is filled in old tires, it is not exposed in the sea and the surface of the mixture does not come into contact with seawater.

Although the fourth conventional fishing reef does not use concrete and does not elute alkaline components, it is composed of a mixture of plastic and an inorganic material such as glass, so that it does not affect the attachment and growth of gametophytes of seaweed. Not very suitable. Although the period from the installation of the fishing reef in the sea to the growth of seaweed is shorter than that of the concrete fishing reef, it still requires a considerably long period. It is an object of the present invention to provide an artificial fishing reef that is suitable for the growth of seaweed and the habitation of fish and shellfish, in which the alkaline component of concrete does not elute into seawater.

[0006]

The artificial fishing reef member of the present invention is a molded body obtained by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder, and the molded body is exposed to seawater. It is characterized by being installed in the sea.
In the artificial fishing reef member of the present invention, a mixture of a small piece of wood and a synthetic resin is molded by a molding die, and at least one surface is provided with a groove to form a convex portion, so that a corner is formed. , Microorganisms such as gametophytes of seaweed in seawater tend to adhere to the suburbs of the corners, and after the adhesions, the corners are fixed as the roots of the roots, resulting in a high colonization rate. After that, the fixing and growth of seaweed proceed at an accelerated rate, and eventually the whole seaweed is covered with seaweed, and shellfish, corals and fishes also function as habitable fish reefs. In an artificial fishing reef member of another configuration of the present invention, a mixture of a small piece of wood and a synthetic resin is poured into a molding die to be molded, so that a small piece of wood is partially exposed on the surface of the fishing reef member after molding. is doing. When this fishing reef member is installed in the sea, seawater permeates a small piece of wood exposed on the surface of the fishing reef member. In addition, even small pieces of wood below a thin synthetic resin film of 0.5 mm or less are gradually infiltrated with seawater through pin holes and the like existing in the synthetic resin film. Thus, when seawater is impregnated into a small piece of wood, the small piece of wood expands to become a porous organic material suitable for growing organisms. Microorganisms such as gametophytes of seaweed in seawater easily attach to such porous organic members and grow quickly after attachment. When seaweed begins to partially grow on the surface of the reef member, the seaweed grows at an accelerated rate, and eventually the whole seaweed is covered with seaweed, so that shellfish, corals and fish also function as fishing reefs. become. The artificial fishing reef unit of the present invention is a concrete base having a predetermined shape, a molded body attached to the base, which is formed by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder. When installed, the surface is exposed to seawater.

The artificial reef unit of the present invention does not move by the force of waves when it is installed on the seabed by attaching the reef member to a concrete stand or the like. The artificial fishing reef member of the present invention is characterized by the fact that wood is projected on the surface of a molded body obtained by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder. The method for constructing an artificial fishing reef unit of the present invention is characterized in that either the artificial fishing reef member or the artificial fishing reef unit is tightened to the seabed in a desired range near the coast. The artificial fishing ground of the present invention is formed by using an artificial fishing reef member or an artificial fishing reef unit made by recycling industrial waste, which is a molded body formed by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder. To be done.
The artificial fishing ground of the present invention is formed by installing the artificial fishing reef member or the artificial fishing reef unit having a predetermined unevenness on the seabed. The artificial fishing ground of the present invention is characterized in that it is formed by constructing the artificial fishing reef member or the artificial fishing reef unit with an inclination on the seabed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. << First Embodiment >> An artificial fishing reef member of the first embodiment of the present invention (hereinafter, simply referred to as a fishing reef member) will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the fishing reef member 1. Reef member 1 is a small piece (chip) of waste plastic and wood
Made from a mixture of. From the viewpoint of recycling industrial materials, it is desirable to use used plastic waste such as parts for home electric appliances and PET bottles as the plastic. For example, thermoplastics such as polyvinyl chloride,
Polyethylene, polystyrene, acrylic, polypropylene, polycarbonate, etc. are used. It is desirable to use a single plastic made by separately collecting and recycling waste plastic, but it is also possible to use a mixture of various materials. Such recycled plastic may be purchased commercially in the form of pellets.

[0009] It is desirable to use wood chips, such as the remaining materials of construction materials, forest thinning materials, sawdust, etc., from the viewpoint of cost and recycling of forest resources. Further, crushing and using a large amount of construction waste materials generated after demolition of a building also plays a part in solving environmental problems by discarding industrial waste. The type of wood (cedar, pine, lauan, etc.) does not matter. These waste woods are crushed and crushed to a size of 5μ.
By using a wood chip having a thickness of about m to about 5 mm, preferably about 10 μm to about 1 mm, the material becomes a material having excellent mass productivity and having a good flow during the molding process, and a molded product having a good surface condition can be obtained. This is because it contributes to lower the flow resistance in the cylinder during high-speed injection molding or high-speed extrusion molding, and the flow resistance decreases as the particle size decreases when flowing into the mold.

The above plastic pellets and wood chips are mixed to form a fish reef member 1 having the shape shown in FIG.
As a molding method, an injection molding method in which the mixture is heated to a predetermined temperature and poured into a mold is generally used. The resin molding method is not limited to the injection molding method, and the type of molding processing such as extrusion molding method, compression molding method, and casting method is not particularly limited. Also, the plastic pellets are not limited to pellets, and may be powder or flakes crushed or crushed. When the plastic is thermoplastic, it can be molded only by heating, but when it is not thermoplastic, a thermoplastic or thermosetting material before curing is appropriately added as a binder. The fishing reef member 1 shown in FIG. 1 has a length of 3 m, a width of 1 m, and a thickness of 0.
It is 3m. It is desirable that the content of plastic and wood in the fishing reef member 1 be 20 to 90% of wood. The amount of wood mixed may depend on the molding method, but when manufacturing by extrusion molding or injection molding, select from 30% to 80% to determine the properties closer to wood. You can get it. In the case of compression molding and injection molding, it is possible to mold by joining the minimum amount of plastic when joining wood chips and powder, and it is possible to mold with 90% wood and 10% plastic in the maximum compounding amount. It was Further, the specific gravity of the fishing reef member 1 is 1 or more, and it is possible to provide a favorable environment for breeding seaweeds and corals when it is submerged in seawater and fixed to the bottom or the like than floating in the sea or the sea surface. The artificial fishing reef member of the present invention was explained using seaweeds. The coral species are most suitable for habitation in the warm sea with a water temperature of about 18 to 30 degrees Celsius. It was also confirmed that results equivalent to those of seaweed could be achieved. Incidentally, it is desirable to select and set the size and shape according to the size of the installation place and the usage environment. Further, the fish reef member of the present embodiment is not limited to seaweed provided in the sea, and can be similarly used for revetment work in rivers.

As shown in FIG. 1, the fishing reef member 1 is provided with a mounting hole 3 for fixing the fishing reef member 1 to a revetment wall, a rock on the sea floor, or the like. Moreover, at least one (two in FIG. 1) groove 5 is provided on the surface. Groove 6 on the side
May be provided. FIG. 2 is a cross-sectional view showing a state where the fishing reef member 1 is attached to the rock 8 on the seabed with the screw 9. Screw 9
For example, an anchor bolt made of a metal such as stainless steel having corrosion resistance to seawater or a reinforced plastic mixed with glass fiber is suitable. The fishing reef member 1 is fixed by making a hole in the rock 8 and screwing in the anchor bolt. When the screw 9 is a reinforced plastic, it is preferable to use a waste plastic as a material plastic because the cost is reduced and recycling is possible. Further, the reinforced plastics mixture may be used by crushing metal waste, for example, waste such as metal processing plant cutting waste, empty can of can juice, automobile parts, etc. into a linear, powder or flake form.

The fishing reef member 1 shown in FIG. 1 is provided with a plurality of grooves 5 and 6, and the corners of these grooves 5 and 6 are strongly attached and grown to a gametophyte of algae released into seawater. become,
Experiments have shown that the seaweed beds can be regenerated. In addition, the present inventor has found that the width of the plurality of grooves 5 is 0.5 mm to
When a seaweed implantation experiment was carried out at 0 mm and the groove depth was 1 mm to 10 mm, good results were obtained. Especially, when the width of the groove 5 or the like is 3 mm to 10 mm and the depth of the groove is 2 mm to 5 mm, more favorable results were obtained in the implantation of seaweed. This is because roots such as sea bream and squid that compose the undersea forest are fixed near the corners of the ditch and developed so as to surround the corners, and the fixing force becomes stronger and stronger. This is because the groove is more likely to escape from the outflow than the one fixed to the flat surface in the groove. The groove 5 of the present invention
Is not limited to the above dimensions, and if selected and manufactured depending on the type of seaweed and the conditions of the seabed at the installation site, it can be applied to various sea areas and rivers.

FIG. 3 is a perspective view of a fishing reef member 1A according to another example of this embodiment. On the reef member 1A, the mounting surface 1 to the seabed
A slit 11 is formed at 0. As a result, when the fishing reef member 1A is installed on the seabed, a tunnel is formed between the fishing reef member 1A and the seabed. Since the flow of seawater is particularly gentle in this tunnel, the corner bodies of seaweed tend to adhere. This fishing reef member 1A
Since the inside of the tunnel will be a hideout for fry, it is suitable for breeding fish and has a high function as a reef. The material and manufacturing method of the fishing reef member 1A are substantially the same as those of the fishing reef member 1, but the manufacturing cost is slightly higher because the structure is rather complicated. FIG. 4 is a perspective view of a fishing reef member 1B according to still another example of this embodiment.
This fishing reef member 1B has a complete tunnel 12 in the longitudinal direction.
Are formed. The action and effect of the tunnel 12 are similar to those of the fishing reef member 1A. The structure of the fishing reef member 1B is slightly more complicated than that of the fishing reef member 1 described above.

FIG. 7 is a sectional view of the press die 20 and the fish reef member 1 showing a method of forming the groove 5 of the fish reef member 1. Before the mixture of plastic and wood chips is cured, the press die 20 is moved in the direction of the arrow 20B to push the blade 20A having a triangular cross section into the upper surface of the fishing reef member 1. As a result, the groove 5 is formed on the upper surface of the fishing reef member 1, and the raised portion 5 is formed along the groove 5.
A occurs. The reef member 1 is formed by the groove 5 and the raised portion 5A.
The number of corners of the convex portion on the upper surface of the seaweed is larger and the surface area is larger, so that the gametophyte of seaweed is likely to adhere due to the implantation property to the corner, which is a characteristic of the gametophyte of seaweed. FIG. 8 is a partial perspective view of the fish reef member 25 in which the comb tooth portion 25A is formed on the upper portion, and FIG. 9 is a partial perspective view of the fish reef member 26 in which the comb tooth portion 26A is formed in the upper portion and the concave portion 26B is formed in the lower portion. It is a figure.
The surface area of these fishing reef members 25 and 26 is larger than that of the fishing reef member 1 of FIG. Also, the comb teeth 25A, 26A
Since the groove and the recess 26B between them are suitable for the growth of juveniles, the function as a fishing reef is excellent. The depth of the concave portion 26B of the fishing reef member 26 is in the range of 1 mm to 10 cm, and preferably 3 cm to 5 cm without hindering the activity of the fry and being less susceptible to attacks from external enemies such as large fish.
It is possible to provide a more comfortable living environment for fishing grounds.

<Second Embodiment> A fishing reef unit according to a second embodiment of the present invention will be described with reference to FIGS. 10 to 14. The fishing reef unit is obtained by attaching the fishing reef member of the first embodiment to a concrete base, and by placing it on the seabed in a shallow sea area, a seaweed bed can be formed to make an artificial fishing reef. Figure 1
0, the fish reef member 1 of FIG. 1 on the concrete base 30,
It is a perspective view of the fishing reef unit 31 attached by the screw 9. The fishing reef units 31 are lined up on the seabed with the fishing reef member 1 facing upward. By arranging them closely,
The side surface of the fish reef unit 31 is almost in close contact with the side surface of the adjacent fish reef unit 31 to minimize the outflow of the alkaline component from the concrete. In addition, in FIG. 10, a table 30 made of concrete is used.
However, the same effect can be obtained by selecting a hollow polygonal prismatic shape or polygonal pyramid. In the case of a square block, it is effective for installation as a measure against waves such as the open ocean where mass is required,
The hollow polygonal column shape can be used when the inside is used as a habitat for fish and shellfish. In the case of a polygonal pyramid shape, it is effective to use it when changing the angle of inclination. FIG. 11 is a perspective view of a fishing reef unit 32 in which the fishing reef member 1A of FIG. The gap between the platform 30 and the slit 11 of the fish reef member 1A serves as a hideout for fry and is suitable for breeding fish. Although the fixing members such as the screws 9 are fixed from the fish reef member 1 side in this figure, the fixing members such as the screws 9 are fixed to the concrete base 30 in advance and the fish reef member 1 is mounted. By fixing with, positioning can be done, which simplifies construction. this is,
It is effective not only for onshore construction, but also for maintenance work underwater. Further, although the fixing method with the screw 9 has been described, the same effect can be obtained even with a one-touch type fixing means (for example, a spring type fixing device or a slide type fixing device).

FIG. 12 is a perspective view of a fish reef unit 33 in which the fish reef member 1A shown in FIG. In addition to the same effect as the fish reef unit 32, the fish reef unit 33 has a slow flow of sea water in the slit 11, so that a gametophyte of seaweed is likely to adhere to the fish reef unit 33, and the fish reef unit 33 is installed in the sea until it functions as a fish reef. The period is short.
The fishing reef unit 34 of FIG. 13 is provided with concrete spacers 35 on the platform 30 at predetermined intervals.
The fish reef member 1 shown in FIG. Due to the spacer 35, the gap formed between the platform 30 and the fish reef member 1 is suitable for the growth of juveniles and is suitable for the breeding of fish.

In the fishing reef unit shown in FIGS. 10 to 13, the fishing reef unit 1 is fixed on the base 30 with the screws 9. In the fishing reef unit 37 shown in FIG. 14, the fishing reef member 1 is placed on the base 30. The fish reef member 1 is fixed by covering the wire net 39 from above with the arrow net as shown by the arrow. By covering a plurality of fishing reef units 37 with a large wire mesh, the screws 9
The work of mounting can be simplified by omitting the mounting process. Figure 15
FIG. 16 is a perspective view showing a process of manufacturing a fishing reef unit 41 in which a concrete base and a fishing reef member are integrally formed, and FIG. 16 is a cross-sectional view of the fishing reef unit 41 of FIG. It is a department. In FIG. 15, a U-shaped mold 46 is placed on the bottom plate 45 of the manufacturing jig. On the open side surface 46A of the form 46, the fishing reef members 43 having a shape similar to that of the fishing reef member 1A shown in FIG. 3 are vertically arranged. Form 4 in this state
When concrete is poured into 6, the concrete becomes
As shown in FIG. 16, the fish reef member 43 also enters the slit 11. After the solidification of the concrete, the form 46 and the bottom plate 4
When 5 is removed, the fish reef unit 41 in which the platform 42 and the fish reef member 43 are integrated is obtained. In the fish reef unit 41 of this embodiment, the fish reef member 1A is screwed to the concrete base.
Since the process of stopping at is omitted and the parts of the form material are reduced, the manufacturing cost is greatly reduced and it is useful for resource conservation.

<< Third Embodiment >> An artificial fishing reef member according to a third embodiment of the present invention is shown in the perspective views of FIGS. Since the fish reef member 1 of the present embodiment is molded by pouring a mixture of wood chips and plastic into a molding die, the fish reef member 1 after molding is formed.
Wood chips are partially exposed on the surface of. When this fishing reef member 1 is installed in the sea, seawater permeates the wood chips exposed on the surface of the fishing reef member 1. Even in the plastic film covering the surface of the wood chips, seawater gradually penetrates into the wood chips under the thin plastic film of 0.5 mm or less through the pinholes existing in the plastic film. When seawater penetrates the wood chips in this way, the wood chips expand and become a porous organic material suitable for growing organisms. Microorganisms such as gametophytes of seaweed in seawater easily attach to such porous organic members and grow quickly after attachment. When the seaweed begins to grow partially on the surface of the fishing reef member 1, the seaweed grows at an accelerated rate, and eventually the whole seaweed is covered with the seaweed, and the fish and shellfish also function as resident fishing reefs. . The fishing reef member 1 of this example has a short period from being installed in the sea to functioning as a fishing reef, and according to various experiments by the inventors, it was confirmed that the fishing reef member 1 became a complete reef in about one year. The artificial fishing reef member of the present invention was explained using seaweeds. The coral species are most suitable for habitation in the warm sea with a water temperature of about 18 to 30 degrees Celsius. It was also confirmed that results equivalent to those of seaweed could be achieved.

In the example shown in FIG. 5, the size of the wood chips 14 as the material of the fishing reef member 1 is increased from 5 mm to 50 mm, and the mixing ratio of the wood chips to the plastic is increased. When the wood chips 14 are made large, the wood chips 14 project to the surface and the number of corners and the like becomes very large, so that the gametophyte of the seaweed and the like easily attach.
Moreover, the area of the porous organic material exposed on the outer surface is increased, which is suitable as a fishing reef. However, since the mechanical strength of the fishing reef member is slightly reduced, it may be damaged by strong waves,
It is possible to make up for these drawbacks by constructing in the inland sea such as the bay. FIG. 6 shows a fish reef member 15 made by pouring a mixed material of liquid plastic and wood chips into a box-shaped mold at the time of molding the fish reef member using the wood chips having a size of 5 mm to 50 mm. It is a perspective view. A large number of wood chips 14 project like needles on the upper surface 15A of the cured reef member 15. Due to the protruding wood chips 14, the corners of the wood chips 14 are greatly increased and the surface area is significantly increased as compared with the example of FIG.
The attachment of the gametophyte of seaweed is further promoted.

<< Fourth Embodiment >> A fish reef unit 32A according to a fourth embodiment of the present invention is shown in the perspective view of FIG. In this embodiment, in the slit 11 of the fishing reef unit 32 shown in FIG. 11, waste such as cutting waste of metal processing factory, metal waste of abandoned automobiles, waste such as empty cans of iron can juice, slag and the like are selected. A solidified material 49 obtained by solidifying at least one of the above-mentioned materials into a plate shape, a rod shape, or a block shape with a binder of waste plastic is inserted. Metal ions such as iron ions released from the solidified substance 49 into seawater promote the growth of plankton and seaweed, and the underwater rich in plankton and seaweed is suitable for the growth of fish and shellfish. The unit 32 has a further excellent function as a fishing reef. Although it has been described that the solidified material 49 is solidified with the binder of the waste plastic, the solidified material 49 may be produced by compressing only the metal waste with a press utilizing the rigidity of the metal.

FIG. 18 is a stuffing containing at least one of metal powder such as iron, or metal powder such as magnesium, small pieces of metal, and metal lumps in the tunnel 12 of the fishing reef member 1B shown in FIG. Put 50. The metal preferably comprises more than one type. The padding 50 is a mixture of metal material such as metal powder, metal pieces, and metal lumps and sand, and 3 parts of sand are added to 10 parts of the metal material in volume ratio.
To 30 parts (preferably 10 parts) are used. A resin or metal net-like lid 51 is provided at both ends of the tunnel 12 to prevent the stuffing 50 from flowing out. By mixing sand into the metal material, the sand shielding effect has the effect of preventing the metal material from flowing out. Further, since it is possible to adjust the contact between the metal material and water, it is possible to control the amount of ionization and prevent the outflow of an unnecessary amount. When the fish reef member 1B containing the stuffing 50 is installed in the sea, the metal ions of the stuffing 50 will appear in the seawater. Metal ions such as iron and magnesium are known to be effective for the growth of seaweed, and are effective for the growth of various organisms such as corals, shellfish, crabs and fish, and also have the effect of collecting fish, making them suitable for fishing reefs. Make the function even better. The lid 51 is fixed by a detachable fixing means such as a screw, or by a fixing method such as an insertion method provided with a groove, a guide, or the like, so that the metal material is a metal with respect to the weight loss after aging. It has a great effect on the long-term utilization of artificial fishing reefs, such as the easy supply of materials.

<Fifth Embodiment> A fifth embodiment relates to a method of installing (constructing) the fishing reef member or the fishing reef unit of each of the embodiments of the present invention on the seabed. FIG. 19 shows a construction method in which the fishing reef member of the first embodiment or the fishing reef unit of the second embodiment is installed in a shallow sea area near the coast. It is sectional drawing of the general example of a coast and a shallow sea area. In the figure, a breakwater 53 is provided on a breakwater foundation 52 provided on the seabed 60. An inclined bottom portion 56 for installing a fishing reef is provided on at least one of the sea bottom and the land side of the breakwater 53. The fishing reef member or the fishing reef unit of the first or second embodiment is arranged on the inclined bottom portion 56 to form the fishing reef bottom 59. The reef member and the reef unit may be mixed in the reef bottom 59. The location where the fishing reef bottom 59 is provided is not limited to the coast or the shallow sea area near the breakwater 53, and it can be provided at a desired location in the sea. Fishing reef bottom 5
When seaweed flourishes in 9, fish and shellfish will also inhabit, and the sea area will become a new fishing ground. That is, a fishing ground can be artificially created by providing the fishing reef bottom 59. In the drawing, the slope on the sea side is shown to be deeper toward the sea side, but if undulations that form part of the shallows are provided on the way, the flow of tide will be slow and landing of seaweed, etc. As well as lead to an increase in fish and shellfish,
Effective for creating new fishing grounds. Such artificial fishing grounds not only help protect the natural environment, but can also be used as marine leisure facilities such as sea fishing parks, and play a major role in protecting and using resources.

[0023]

As described in detail in each of the above embodiments, according to the present invention, since plastic and wood chips are mixed and solidified to form a fish reef member, elution of alkaline components in concrete is suppressed. At the same time, the wood chips, which are natural materials, are impregnated with seawater. Therefore, in the sea, fish reefs in which gametophytes and spores of seaweed adhere and grow easily can be obtained. In addition, in the case where a recess or a tunnel is provided in the sea where the flow of seawater is gentle, these recesses and tunnels serve as a hideout for fry and are suitable for breeding fish.

[Brief description of drawings]

FIG. 1 is a perspective view of an artificial fishing reef member according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an attachment portion of the artificial reef member of the first embodiment.

FIG. 3 is a perspective view of an artificial fishing reef member of another example of the first embodiment.

FIG. 4 is a perspective view of an artificial fishing reef member of still another example of the first embodiment.

FIG. 5 is a perspective view of an artificial fishing reef member of still another example of the third embodiment.

FIG. 6 is a perspective view of an artificial fishing reef member of still another example of the third embodiment.

FIG. 7 is a cross-sectional view showing a step of forming a groove in the artificial fishing reef member of the first embodiment.

FIG. 8 is a perspective view of an artificial fishing reef member of still another example of this embodiment.

FIG. 9 is a perspective view of an artificial fishing reef member of still another example of the present invention.

FIG. 10 is a perspective view of an artificial fishing reef unit according to a second embodiment of the present invention.

FIG. 11 is a perspective view of an artificial fishing reef unit of another example of the second embodiment.

FIG. 12 is a perspective view of an artificial fishing reef unit of still another example of the second embodiment.

FIG. 13 is a perspective view of an artificial fishing reef unit of still another example of the second embodiment.

FIG. 14 is a perspective view of an artificial fishing reef unit of still another example of the second embodiment.

FIG. 15 is a perspective view showing a method for manufacturing an artificial fishing reef unit according to still another example of the second embodiment.

FIG. 16 is a cross-sectional view of an artificial fishing reef unit manufactured by the above manufacturing method.

FIG. 17 is a perspective view of an artificial fishing reef unit of still another example of the fourth embodiment.

[Fig.18] Artificial fishing reef unit with a metal strip packed in the tunnel

FIG. 19 is a sectional view showing a method of installing an artificial fishing reef unit on the seabed according to the fifth embodiment of the present invention.

[Explanation of symbols]

1, 15, 25, 26, 43 Fishing reef members 1A, 1B Molded bodies 3 Holes 5, 6 Grooves 8 Rocks 9 Screws 10 Mounting surfaces 11 Recesses 12 Recesses 12 Hollow portions 14 Wood chips 15A 15 Upper surface 25A Comb teeth 26A Comb teeth Part 26B Recesses 30, 42 Concrete stand 31, 32, 33, 34, 35, 37, 41 Fishing reef unit 35 Spacer 39 Wire net 45 Bottom plate 46 of manufacturing jig U-shaped form 46A Open side 49 Synthetic resin molding 50 Stuffed material 51 Net-like lid 52 Breakwater foundation 53 Breakwater 56 Sloped bottom 59 Fishing reef bottom 60 Sea bottom

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masao Ohno             226-2 Ijiri, Usa Town, Tosa City, Kochi Prefecture (72) Inventor Riki Takahashi             Kou 22, Motoyama Ko, Toyonaka-cho, Mitoyo-gun, Kagawa             Kawamatsu Shitaju Electronics Co., Ltd. (72) Inventor Chika Mizuno             2-12-4 Pier Dori, Kochi City, Kochi Shikoku             At Doken Co., Ltd. F term (reference) 2B003 AA01 BB02 BB06 CC04 CC05                       DD00 DD01 DD02 DD03

Claims (27)

[Claims] 1. A molded body obtained by molding a small piece of wood into a predetermined shape using plastic (synthetic resin) as a binder, wherein the molded body is installed in the sea so that the surface is exposed to seawater. Artificial fishing reef material. 2. The artificial fishing reef member according to claim 1, wherein the content of the small pieces of wood in the molded body is 20% to 90% by volume. 3. The artificial fishing reef member according to claim 1 or 2, wherein the specific gravity of the molded product is larger than that of seawater. 4. The synthetic resin is a recycled product of a synthetic resin of industrial waste, and the wood is composed of at least one kind of wood waste, thinned wood, sawdust, construction waste, and the like. The artificial fishing reef member according to any one of claims 1 to 3. 5. The pieces of wood have a size of 5 μm to 5 μm.
The artificial fishing reef member according to any one of claims 1 to 4, wherein the artificial fishing reef member is in the range of mm. 6. The artificial reef member according to claim 1, wherein the predetermined shape of the molded body is a rectangular parallelepiped and has at least one groove on at least one surface. . 7. The width of the groove is 0.5 mm to 50 mm,
The artificial fishing reef member according to any one of claims 1 to 6, wherein the depth of the groove is in the range of 1 mm to 10 mm. 8. The molded body has a mounting hole for fixing the molded body to the seabed.
The artificial fishing reef member according to claim 7. 9. The molded body has a recess that forms a tunnel when installed on the seabed.
9. The artificial fishing reef member according to claim 8. 10. The artificial fishing reef member according to claim 1, wherein the molded body has a hollow portion. 11. The molding according to claim 1, wherein at least one surface of the molded body has a plurality of comb-shaped projections.
11. The artificial fishing reef member according to claim 10. 12. The molded body has a recess on one surface and a protrusion on the other surface.
An artificial fishing reef member according to claim 11. 13. The artificial fishing reef member according to claim 1, wherein a small piece of wood is formed into a predetermined shape by using a synthetic resin as a binder, and the wood is projected on the surface. 14. The artificial fishing reef member according to claim 13, wherein the size of the small piece of wood is 5 mm to 50 mm. 15. A concrete pedestal having a predetermined shape, a molded body attached to the pedestal, formed by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder, when the submarine is installed in the sea together with the pedestal. An artificial fishing reef unit whose surface is exposed to seawater. 16. The artificial fishing reef unit according to claim 15, wherein the molded body has a recess that forms a tunnel between the molded body and a base. 17. The artificial reef unit according to claim 15 or 16, wherein a spacer is provided between the base and the molded body. 18. The artificial fishing reef unit according to claim 17, wherein the spacer is a molded body obtained by molding a wood piece of a material into a predetermined shape using a synthetic resin as a binder. 19. The artificial fishing reef unit according to any one of claims 15 to 17, wherein the molded body is placed on the table, a wire net is covered, and the molded body is fixed to the table. . 20. In the recess of the molding member having a recess,
The artificial fishing reef unit according to any one of claims 15 to 19, wherein the molding member and the base are integrally formed by pouring concrete forming the base. 21. The artificial reef unit according to any one of claims 1 to 20, wherein a synthetic resin molded product containing metal strips of iron, magnesium or the like is inserted into the tunnel. 22. The artificial reef unit according to any one of claims 1 to 20, wherein a mixture of sand and fine particles of iron, magnesium or the like is stored in the tunnel. 23. The artificial reef unit according to any one of claims 1 to 20, wherein a metal mass such as iron or magnesium is inserted into the tunnel. 24. A method of constructing an artificial fishing reef unit, comprising squeezing either the artificial fishing reef member or the artificial fishing reef unit to the seabed in a desired range near the coast. 25. An artificial fishing reef member or an artificial fishing reef unit made of recycled industrial waste, which is a molded product formed by molding a small piece of wood into a predetermined shape using a synthetic resin as a binder. Artificial fishing grounds. 26. An artificial fishing ground formed by installing the artificial fishing reef member or the artificial fishing reef unit having a predetermined unevenness on the seabed. 27. An artificial fishing ground formed by constructing the artificial fishing reef member or the artificial fishing reef unit with a slope on the seabed.