JP2002335807A - Hollow body for fishing ground facility and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete formed body for fishing ground facilities capable of using recycled shells of oyster and suitable for various applications to fishing ground facilities, especially mound fishing banks. SOLUTION: This concrete body 1 is formed by hammering concrete including shells 2 as aggregates in a cylindrical shape. Fishes can grow in the inside of the hollow concrete body 1 and the concrete formed body functions as a fishing and growing bank. The primary productivity of a sea area is increased by activating growth of phytoplankton by piling up the concrete bodies 1 to form a mound on the sea bottom and artificially generating upwelling currents to rise nutrient salts on the sea bottom to 20-30 m depth of water to which the rays of the sun can reach.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow molded body made of concrete or ceramic for fishing ground facilities such as fish reefs and breeding reefs for polychaete, small crustaceans and fish, and mound fish reefs, and a method for producing the same.

[0002]

In recent years, fishing grounds have been improved in order to protect and foster marine resources at coastal fishing grounds. Recycling has been required, and oyster shells are being recycled for use as fish reefs and breeding reefs.

[0003] Such fish reefs and breeding reefs using shells such as oysters are disclosed, for example, in JP-A-6-14172.
7, JP-B-6-77493, JP-A-7-23638
As disclosed in Japanese Patent Application Publication No. 5 (1993) -2005 and the like, there is an artificial reef collecting fish case as a reef that fills a net with shells such as oysters and breeds polychaete, small crustaceans and the like in the gaps between the shells. In recent years, a reef block made of concrete and a fish reef frame with a steel structure have been constructed, and a storage frame with shells fixed with mortar or the like is arranged above the fish reef frame to improve the function as a fish reef. Hybrid artificial reefs are also used.

[0004] However, these are aimed at the propagation of fish, and cannot be applied to other uses for fishing ground facilities, and have a problem of poor versatility. Further, there is a problem that the cost is high due to the complicated structure.

By the way, the so-called upwelling current flowing from the sea floor toward the sea surface pushes up nutrients such as phosphate and nitrate to the upper layer where sunlight can reach, thereby promoting photosynthesis by sunlight and increasing plankton growth. And create a favorable environment for fish to live in. Therefore, a mound fish reef that forms a mountain-shaped obstacle on the seabed is used to make a horizontal current of an ocean current or a tidal current a vertical upwelling current.

As this mound fish reef, for example, coal ash discharged from a thermal power plant or the like is solidified together with concrete to form a square concrete molded body, and the concrete molded body is tens to hundreds of meters long on the sea floor. The mound fish reef contributes to the growth of fish etc. by causing upwelling, but it has the function of a multiplication reef itself. However, it was not necessarily suitable for fish inhabitation. Also, since coal ash is used, it cannot be said that there is no impact on the environment.

[0007] If a fish reef
Providing hollow moldings for fishing ground facilities using recycled oysters and other shells that can be widely used not only for breeding reefs but also for fishing ground facilities such as mound fish reefs will not only promote the improvement of fishing grounds, but also shells It is desirable because it can be recycled.

[0008] The present invention has been made based on the above problems, and it is possible to recycle shells such as oysters,
It is an object of the present invention to provide a hollow molded body made of concrete or ceramic for a fishing ground facility suitable for a fishing ground facility suitable for various uses for a fishing ground facility, particularly a mound fish reef, with a simple structure, and a method for producing the same.

[0009]

According to a first aspect of the present invention, there is provided a hollow molded article for a fishing ground facility, wherein concrete or ceramic using a shell as an aggregate is formed in a hollow shape. For this reason, fish can grow inside and outside the hollow concrete or ceramic molded body, and can function as a fish reef / proliferation reef. In addition, the concrete or ceramic molded body is piled up in the form of a mountain on the sea floor to form a mound fish reef, thereby artificially generating upwelling, and dispersing nutrients in the sea bottom at a water depth of 20 to 3 to which sunlight can reach.
0 m to activate the growth of phytoplankton and increase the basic productivity of the sea area. In particular, since a hollow concrete or ceramic molded body is piled up, an upwelling flow is likely to occur.

[0010] In a second aspect of the present invention, in the hollow molded article for a fishing ground facility, the hollow shape is a cylindrical shape. For this reason, fish easily grow inside and outside the concrete or ceramic molded body, and the function as a fish reef / proliferation reef is further improved. Also,
When used as a mound fish reef, it produces an upwelling flow as a whole, while a swirl area is generated near the fish reef, which reduces the effects of tidal currents and also exerts a fish multiplication effect.

[0011] The hollow molded article for a fishing ground facility according to claim 3 is:
In Claim 1 or 2, since the use for the fishing ground facility is a mound fish reef, the water depth is 80 to 100.
The height is about 10-20m and the width is 40-50 on the sea floor of about m
It is sufficient to lay the m-shaped mountain-shaped structure so as to be formed over several tens of meters to one hundred and several tens of meters in length.

[0012] The hollow molded article for a fishing ground facility according to claim 4 is:
In claim 1 or 2, the use for the fishing ground facility is a fish reef or a multiplying reef, and a plurality of the reefs are used in combination. For this reason, it is possible to form fish reefs and breeding reefs of various sizes by forming a shelf frame of metal or the like and mounting it on it, or by forming a cutout in a hollow molded body for fishing ground facilities and combining them. In addition, the size of the reef can be easily manufactured according to the installation location, and the versatility is excellent.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a hollow molded article for a fishing ground facility, wherein concrete, mortar or cement paste containing shells as an aggregate is cast into a cylindrical form and centrifugally molded to form a hollow. Shape. For this reason, shells, which are aggregates, are not unevenly distributed, and complex irregularities are formed by shells on the inner peripheral surface of the hollow concrete molded body, and a large number of cavities are formed in gaps between shells. Since it is formed, it becomes porous, so that a hollow molded article for a fishing ground facility in which seaweeds can easily grow and polychaetes, small crustaceans, and the like easily proliferate can be obtained.

Further, a method of manufacturing a hollow molded article for a fishing ground facility according to a sixth aspect is the method of the fifth aspect, wherein the shell is subjected to centrifugal molding such that the shell is exposed on the outer side and the inner side. For this reason, since seaweeds and algae can also form on the outer surface side of the obtained molded body, it is possible to produce a molded body having excellent effects as a fish reef or a reef.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The concrete molded body 1, which is a hollow molded body for a fishing ground facility of the present embodiment, has a cylindrical shape, and a large number of shells 2 are exposed on the inner and outer peripheral surfaces, particularly on the inner peripheral surface, so that the uneven portions 3 are formed. Many cavities 4 are formed in these gaps by joining with concrete 5. Since the cavities 4 between the shells 2 have no regularity in arrangement, shape, size, etc., the cavities 4 have a complicated and intricate maze shape, on which seaweeds grow, polychaetes, small crustaceans. Etc. are easy to multiply.

The cylindrical tubular concrete molded body 1 as described above can be manufactured, for example, by centrifugal molding as shown in FIG. That is, first, the concrete is adjusted. This concrete is obtained by mixing oyster shells as an aggregate with cement, and a suitable amount of gravel, sand, or the like may be mixed as necessary. The mixing ratio of the concrete as described above is, for example, about 50 to 300 parts by weight, particularly about 50 to 100 parts by weight, persimmon shell per 100 parts by weight of cement. The amount of water is 30 to 50 parts by weight based on 100 parts by weight of cement.
Particularly, it is 35 to 45 parts by weight. In addition, an appropriate amount of an admixture can be added to 100 parts by weight of cement as an additive. Concrete is prepared by mixing and kneading concrete materials in such a mixing manner.

On the other hand, if necessary, a release agent is applied to the inner surface of the mold 11 having an inner diameter corresponding to the outer diameter of the concrete molded body 1 and a reinforcing bar is installed. Then, the mold 11 is provided with a rotating mechanism (not shown). The mold 11 is placed on the mold support 12 and the mold 11 is
Concrete 13 is poured (poured) while rotating at a speed of about 500 revolutions / minute, and a centrifugal compaction step is performed. Thereafter, the concrete molded body 1 as shown in FIG. 1 can be manufactured by performing respective steps such as steam curing, demolding, and wet curing. In the concrete molded body 1 thus obtained, the exposure of the shell 2 to the outer side surface can be adjusted by adjusting the rotation speed of the mold 20. In other words, when the form 20 is rotated, while the number of rotations is low, an appropriate centrifugal force is applied to the poured concrete.
Are dispersed and appear not only on the inner surface side (center side) but also on the surface side. Then, by continuing to rotate as it is, or by increasing the rotation speed when the viscosity of the concrete increases, the concrete enters between the shells 2 without any gap due to the centrifugal force, and in this portion, the concrete is compacted in the same manner as the concrete base. . Therefore, even the shell 2 that appears on the surface of the concrete molded body 1 is firmly fixed. Since the shell 2 is exposed on the surface side of such a concrete molding 1, seaweeds can grow on the surface side, and polychaetes, small crustaceans, etc. can proliferate on the surface side. It is particularly excellent as a breeding reef.
Contrary to this, when the rotational speed of the mold 20 is rapidly increased to increase the centrifugal force, the shell 2 concentrates on the inner surface side (center side) while the gravity G due to the centrifugal force and the specific gravity difference. Since the front side is compacted while being strongly pressed against the mold 20, the shell 2 is smooth only on the inner side as shown in FIG.
Can be manufactured. This molded product has a large centrifugal force, so that the concrete is further compacted and thus has a high mechanical strength. Therefore, the amount of the shell 2 can be increased, so that the shell 2 is excellent in recyclability and is particularly suitable as a mound fish reef.

As described above, according to the method of manufacturing a hollow molded article for a fishing ground facility of the present embodiment, the mode of the concrete molded article 1 is variously adjusted according to its use by variously adjusting centrifugal conditions in centrifugal molding. Can be.

Next, a method of using the hollow molded article for a fishing ground facility of the present embodiment will be described. The concrete molded body 1, which is a hollow molded body for a fishing ground facility of the present embodiment, can be used as a fish reef or a breeding reef by being laid on the seabed at an appropriate depth. In this case, it is preferable to use the concrete molded body 1 in which the shell 2 also appears on the surface side. And since this concrete molded object 1 is a hollow cylindrical shape, the tidal current S which contacted this concrete molded object 1 forms a complicated swirl area by radiating in various directions, and the tidal current S is weakened. Become. Furthermore, the concrete molding 1
Are formed on the front and back surfaces of the shell, and the interior of the uneven portion 3 is formed into a complicated and maze-like shape by the hollow portion 4 formed therein. , An environment suitable for small crustaceans, etc.
These proliferate. In addition, large brown algae such as Honda straw, alame, and squid growing on the sea floor of the open sea settle on the concrete molded body 1. As a result, fry and immature fish of useful fish, such as whitefish, Thailand, flounder, and porpoise, which feed on them, gather around, and fry and immature fish of these useful fish can be bred. The hollow molded article 1 for a fishing ground facility of the present embodiment has a simple structure and is not only inexpensive, but also needs to be piled up to a desired height on the seabed. There are no restrictions on the installation location, and the versatility is improved.

Further, as shown in FIG. 5, a shelf frame 6 having a plurality of storage frames 6A and the like is formed from a metal bar or the like such as a section steel such as an H-beam, and concrete is added to the storage frame 6A of the shelf frame 6. By storing the molded body 1, a fish reef / breeding reef having a desired size can be easily manufactured. Further, as shown in FIG. 6, the concrete molded bodies 1 can be alternately vertically and horizontally stacked via the spacer block 7 to form a fish reef / breeding reef.

On the other hand, the hollow molded article 1 for a fishing ground facility of this embodiment
Can be used as a mound fish reef by submerging at an appropriate depth in the seabed. As shown in FIG. 7, the mound fish reef has a height (h) of about 10 to 20 m and a width (w) of 40 on a seabed 21 having a depth of about 80 to 100 m, for example.
A mound (artificial seabed vein) 22 is formed by submerging a fishing ground facility hollow molded body 1 so as to create a mountain-like structure of about 50 m in length ranging from several tens of meters to one hundred and several tens of meters. By forming such a mound 22, the tidal current S on the sea floor, as a large flow, hits the mound 22 and generates an upwelling current S 1. In general, nutrients rich in minerals tend to stagnate in the seabed, so the upwelling S1 causes nutrients to rise to 20 to 30m where sunlight can reach, activating phytoplankton and promoting its growth. The basic production capacity of the sea area can be increased. On the other hand, since the concrete molded body 1 is cylindrical, a vortex area is generated, and the tidal current S is weakened in the vicinity thereof. Further, the concrete body 1 itself also functions as a breeding reef as described above. It is particularly suitable as For this mound fish reef, a concrete molded body 1 having a smooth surface and a shell 2 only on the inner side is suitable.

As described in detail above, the concrete molded body 1 of the present embodiment is formed by casting concrete using the shell 2 as an aggregate into a hollow shape. It is easy for seaweeds to form on the surface and for the growth of polychaetes, small crustaceans, etc., and the fish can grow and function as fish reefs and reefs. Also,
Fish reefs and breeding reefs of various sizes can be made by placing them on the shelf frame 6 or forming a pair of openings 1A on the side surfaces and combining them. It is excellent in versatility. Further, the concrete molded body 1 is piled up in a mountain shape on the seabed 21 to form a mound 22, so that the upwelling S1 is artificially formed.
Cause nutrients in the sea bottom to reach the sun's depth of 2
It can be raised to 0-30 m to activate the growth of phytoplankton and increase the basic productivity of the sea area. Furthermore, since the hollow cylindrical concrete compacts 1 are piled up in a mountain shape, the upwelling flow is likely to occur. In particular, since the concrete molded body 1 of this embodiment uses the shell 2 as an aggregate, trace amounts of various minerals including calcium are eluted from the shell 2, so that fish reefs and breeding reefs,
Alternatively, the mound reef as a whole is particularly suitable for the growth of fish and has little effect on the environment.

Further, in the method of manufacturing the concrete molded body 1 of the present invention, concrete containing the shell 2 as an aggregate is cast into a cylindrical form 11 and centrifugally formed to have a hollow shape. The shell 2 as an aggregate is not unevenly distributed in the longitudinal direction, and a complicated uneven portion 3 is formed on the inner peripheral surface of the hollow concrete molded body 1 by the shell 2. A large number of cavities 4 are formed in the gaps, so that the concrete molded body 1 is porous and has excellent growth properties on which seaweeds can grow and polychaete, small crustaceans, and the like proliferate. In particular, it is possible to adjust the exposure of the shell 2 to the surface of the concrete molded body 1 and the like according to the conditions of the centrifugal molding, and the centrifugal molding is performed such that the shell 2 is exposed to the outer surface and the inner surface of the concrete molded body 1. You can also. For this reason, polychaetes, small crustaceans, etc., or seaweeds or algae serving as food for various fishes can also be formed on the outer surface of the obtained molded body 1, so that the molded body has excellent effects as a fish reef / breeding reef. Can be manufactured.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the case of a concrete molded body has been described as an example. However, in the case of a ceramic, it is similarly applicable by mixing shellfish and firing. Furthermore, it is applicable not only to concrete but also to mortar or cement paste. Furthermore, you may apply to gypsum. In this specification, the term “fish reef” simply refers to a reef other than the mound reef. Further, in the above-described embodiment, the case of the cylindrical concrete molded body has been described. However, the shape may be a hollow shape, and may be a square tubular shape, a triangular tubular shape, or the like.
The shell does not need to be an oyster, and it goes without saying that it can be applied to various other bivalves, snails and the like.

[0025]

The hollow molded body for fishing ground facilities according to the first aspect of the present invention is a hollow concrete or ceramic molded body made of concrete or ceramic using shells as an aggregate. Fish can grow inside and can function as a fish reef / breeding reef. In addition, this concrete molded body is piled up in a mountain shape on the seabed to form a mound fish reef, thereby artificially generating upwelling and raising nutrients on the seabed to a depth of 20 to 30 m where sunlight can reach, The plankton growth can be activated to increase the basic productivity of the sea area.

Further, in the hollow molded article for a fishing ground facility according to the second aspect, since the hollow shape is cylindrical in the first aspect, fish can easily grow inside the concrete or ceramic molded article. However, the function as a fish reef has been further improved. Also, when used as a mound fish reef, upwelling tends to occur.

[0027] The hollow molded article for a fishing ground facility according to claim 3 is
In Claim 1 or 2, since the use for the fishing ground facility is a mound fish reef, the water depth is 80 to 100.
The height is about 10-20m and the width is 40-50 on the sea floor of about m
It is sufficient to lay the m-shaped mountain-shaped structure so as to be formed over several tens of meters to one hundred and several tens of meters in length.

[0028] The hollow molded article for a fishing ground facility according to claim 4 is
In Claim 1 or 2, since the use for the fishing ground facility is a fish reef or a breeding reef and a plurality of reefs are used in combination, a shelf frame is formed of metal or the like, and the shelf frame is mounted on the shelf frame. By forming the cutouts in the molded body and combining them, fish reefs of various sizes can be obtained, so that fish reefs of a size corresponding to the installation location can be easily manufactured, and the versatility is excellent.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a hollow molded article for a fishing ground facility, wherein concrete, mortar or cement paste containing shells as an aggregate is cast into a cylindrical form and centrifugally molded to form a hollow. Because it is a shape, shells as aggregates are not unevenly distributed, complex irregularities are formed by shells on the inner peripheral surface of the hollow concrete molded body, and furthermore, gaps between shells are formed. Since many cavities are formed, it becomes porous, and seaweeds can grow on it, polychaete,
A hollow molded article for a fishing ground facility in which small crustaceans and the like easily proliferate can be obtained.

Further, the method for manufacturing a hollow molded article for a fishing ground facility according to claim 6 is a method according to claim 5, wherein the shell is subjected to centrifugal molding so as to be exposed on the outer side and the inner side. Since seaweeds and algae can be formed on the outer surface of the obtained molded body, it is possible to produce a molded body having excellent effects as a fish reef and a reef.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a hollow molded body for a fishing ground facility according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a cross-sectional view showing an apparatus for manufacturing the hollow molded article for a fishing ground facility.

FIG. 4 is a perspective view illustrating a hollow molded article for a fishing ground facility according to a second embodiment of the present invention.

FIG. 5 is a front view showing a method of using the hollow molded article for a fishing ground facility of the first embodiment.

FIG. 6 is a schematic view showing another method of using the hollow molded article for a fishing ground facility of the first embodiment.

FIG. 7 is a schematic view showing a method of using the hollow molded article for a fishing ground facility of the second embodiment.

[Explanation of symbols]

 1 Concrete molded body (hollow molded body for fishing ground facilities) 2 Shell 11 Formwork 13 Concrete 22 Mound

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 18:04) F-term (Reference) 2B003 AA01 BB02 BB03 BB05 CC01 CC05 DD01 DD08 4G012 PA25 PE04 4G058 AA02 AC08 BA00

Claims (6)

[Claims] 1. A hollow molded article for a fishing ground facility, wherein concrete or ceramic using shells as an aggregate is formed in a hollow shape. 2. The hollow molded article for a fishing ground facility according to claim 1, wherein the hollow shape is a cylindrical shape. 3. The hollow molded article for a fishing ground facility according to claim 1, wherein the use for the fishing ground facility is a mound fish reef. 4. The hollow molded article for a fishing ground facility according to claim 1, wherein the use for the fishing ground facility is a fish reef or a breeding reef, and a plurality of the reefs are used in combination. 5. A method for producing a hollow molded article for a fishing ground facility, wherein concrete, mortar or cement paste containing shells as an aggregate is cast into a cylindrical form and centrifugally molded. 6. The method according to claim 5, wherein the shell is subjected to centrifugal molding such that the shell is exposed on an outer surface and an inner surface.