JPH0354539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an artificial fish reef, and particularly provides an artificial fish reef that does not require much netting such as a fishing net.

[Prior art]

In recent years, with the demand for expansion of coastal fisheries production, it is expected that the development of artificial fish reefs that are more effective than before, especially artificial fish reefs that can be assembled into large or ultra-large sizes, is expected.
Many of these have already been studied and implemented.

However, in general, large artificial reefs are often constructed by using a plurality of unit reefs and combining them in various ways, and as a result, protrusions of various shapes are often present on the surface of the completed artificial reef. . For this reason, fishing nets such as gill nets, purse nets, and seine nets are susceptible to so-called netting due to the protrusions. The larger the artificial reef, the more complex the protrusions are, and once a net is caught, the operation of moving the net to remove the net will cause other protrusions to be caught again. In some cases, fishing net owners may suffer significant damage due to partial cutting of fishing nets.

In particular, large artificial reefs are often sunk at relatively deep seabeds, making them difficult to detect from the sea. The problem has been brought into sharp focus.

[Purpose of the invention]

In view of the current situation, it is an object of the present invention to provide a large artificial fish reef with almost no netting. Specifically, the present invention is based on Patent Invention No. 1026077 (Japanese Patent Publication No. 15968, 1983), which was previously proposed by some of the applicants.
This patent relates to an improved technique that is not specifically disclosed in the specification of the patented invention. Therefore, like the patented invention, the present invention has a large horizontal and vertical spread, increases the so-called empty cubic meter to increase the carrying capacity for fish, and has a complex internal space structure, and has a In addition to preventing entrapment, the purpose is to improve the functionality of an artificial reef, such as by securing multiple reef chambers with varying numbers of fish to increase the fishing effect.

[Structure of the invention]

In order to achieve the above object, the present invention employs the following configuration. That is, the present invention uses a plurality of unit pieces, each unit piece has one end connected to the intermediate part of another unit piece, and the one end is connected to the intermediate part of the combined unit piece. One end of the other unit pieces is joined to form a central reef chamber in the center, and the free end of each unit piece is connected to the free end of the unit piece whose one end is joined to the intermediate part of the unit piece. In an artificial reef constructed by stacking two or more tiers of unit reefs in which auxiliary reef chambers with triangular horizontal cross sections are formed by auxiliary unit pieces, each center of the unit reefs adjacent above and below When the reef chambers are projected onto the same horizontal plane, the center points of both central reef chambers are at the same position, and one central reef chamber is rotated by a certain angle with respect to the other central reef chamber about the center point. In addition, the artificial reef is constructed by stacking unit reefs so that the outer shape of the entire artificial reef is approximately prismatic or truncated pyramid-shaped, and the side walls of the prismatic or truncated pyramid are substantially free from irregularities. It is an artificial reef characterized by stacking fish reefs.

[Specific embodiments of the invention]

The present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a typical embodiment of a unit reef 1 according to the present invention.

In FIG. 1, four unit pieces 2',
2'', 2 and 2''''' are used, one end of each unit piece (e.g. unit piece 2') is connected to the intermediate part of the other unit piece (e.g. unit piece 2''''), One end of another unit piece (for example, unit piece 2'') is further connected to the intermediate part of the unit piece (for example, unit piece 2') to which the one end is connected, and a central reef chamber 3 is formed in the central part. ing.

Here, the intermediate part of the unit piece in this specification refers to the part of the unit piece other than the end part, but it is generally preferable to define the middle part as the central part of the unit piece divided into three equal parts.

In addition, each unit piece (for example, unit piece 2
``'''') free end (in this specification, among the ends of a unit piece, the end that is not connected to other unit pieces and the vicinity of that end are referred to as free ends) and the middle of the unit piece An auxiliary unit piece (for example, an auxiliary unit piece 4') that connects the free end of a unit piece (for example, a unit piece 2') whose one end is connected to the
As a result, an auxiliary reef chamber (for example, auxiliary reef chamber 5') having a triangular horizontal cross section is formed. In Figure 1, four auxiliary unit pieces 4', 4'', 4 are used, and four triangular reef chambers 5', 5'', 5 and 5 are used.
′′′′ is formed.

With this configuration, it is possible to most effectively promote the horizontal expansion necessary for a fish reef. For example, FIGS. 2a and 2b are plan views of unit reefs 1 each constructed using four unit pieces. Among these, case a is a case where the unit piece is simply constructed in a square shape, and case b is a case where the end of another unit piece is connected to the midpoint of the unit piece. A and b use unit pieces of the same length, but when comparing the so-called empty standing meters of the two, b is considerably larger. That is, the empty cubic meter of b is shown by the broken line quadrilateral 6, and is 1.25 times the empty cubic meter of a.

As illustrated in FIG. 1, the auxiliary unit piece 4' can be configured to be narrower than the unit piece 2',
The amount of material required for the auxiliary unit piece 4' is
It is considerably less than unit piece 2'. Therefore, by configuring it like a unit reef in the present invention,
Empty standing rice can be efficiently increased with the same amount of material.

The unit pieces 2', 2'', 2 and 2''''' and the auxiliary unit pieces 4', 4'', 4 and 4 are used to store fish in the central reef chamber 3 and the auxiliary reef chambers 5', 5'', 5 and 5'. Appropriate window holes 7 and 8 are provided in ``'' for easy access.
It is preferable to provide In addition, as shown in FIG. 1, for example, the unit pieces 2', 2'', 2, and 2''''' are thickened appropriately only in the portions that act as reinforcing ribs, and the plate thickness is increased in the vicinity of the window hole 6. It is also a good idea to reduce the cost by reducing the amount of material used by making the material thinner.

Further, the unit pieces 2', 2'', 2 and 2''''' and the auxiliary unit pieces 4', 4'', 4 and 4''''' do not necessarily have to have a plate-like or planar structure, but have reinforcing ribs. It may be a columnar or bone structure that mainly functions. For example, unit piece 2',
2'', 2 and 2''''' may be a surface structure, and the auxiliary unit pieces 4', 4'', 4 and 4''''' may be a bone structure.

Furthermore, regarding the central reef chamber 3, if the length of one side of the reef chamber is generally 2 m or more, desirable results as a reef chamber may not be expected in some cases. It is also effective to subdivide the reef chamber into a plurality of reef chambers.

FIG. 3 is a perspective view showing another embodiment of the unit reef in the present invention. Particularly when complexity is required, such as when creating a large artificial reef, the third
As shown in the figure, unit pieces 2', 2'', 2 and 2
It is also good to have a multiple structure for ′′′′. As a result, a small chamber similar to a reef chamber is formed inside the unit piece. Furthermore, auxiliary unit pieces 4', 4'', 4 and 4
It is also possible to subdivide the auxiliary reef chamber formed by ``'''' by providing appropriate partition plates as a means of constructing various artificial reefs.

Further, it is also possible to provide a ceiling plate 9 in part on the upper side of the reef chamber, as appropriate. This makes it possible to influence the liquid flow as well as structural changes.

Note that the number of unit pieces to be used is not limited to four, and may be selected as appropriate depending on the purpose. For example, five pieces may be used to form a pentagonal central reef chamber.

Further, the means for connecting the unit pieces to each other is not particularly limited, but it is also preferable to adopt a screw type connection method as shown in FIG. 1, since a strong connection can be obtained. In this case, in order to prevent rust of the metal rod shaft, it is preferable to close both ends of the screw shaft hole with, for example, concrete so that both ends of the metal rod shaft, which will become a screw shaft, are not exposed to the outer surface.

The main feature of the present invention is that it is constructed by using a plurality of unit reefs as described above and stacking them in a specific manner. In other words, when unit reefs are stacked, the center points of both center reef chambers are at the same position when the central reef chambers of the upper and lower adjacent unit reefs are projected onto the same horizontal plane, and one central reef chamber to the other central reef chamber;
Located at a position rotated by a certain angle, the overall external shape of the entire artificial fish reef constructed by stacking unit reefs is approximately prismatic or truncated pyramid, and there are substantial irregularities on the side wall surfaces forming the prismatic or truncated pyramid. The idea is to stack unit reefs to prevent the formation of fish.

FIG. 4 is a perspective view of an artificial reef of the present invention constructed by stacking the unit reefs shown in FIG. 1, and is a typical embodiment of the present invention. Further, FIG. 5 is a cross-sectional view taken from A to A in FIG. 4, and FIG. 6 is a cross-sectional view taken from B to B in FIG. 4. As can be understood from these drawings, when the central reef chambers of vertically adjacent unit reefs (for example, 1' and 1'') are projected onto the same horizontal plane, the center points of both central reef chambers are at the same position,
Moreover, one central reef chamber is configured to be at a position rotated by a certain angle with respect to the other central reef chamber about the center point.

Specifically, such a structure can be easily achieved by, for example, alternately stacking the unit reefs shown in FIG. 1, which are turned upside down and those which are not turned over.

Further, as shown in FIG. 4, it is essential that the unit reefs be stacked so that the entire outer shape of the artificial reef is approximately prismatic or truncated pyramid-shaped.

Here, the fact that there are substantially no irregularities on the side wall surfaces constituting the prisms or truncated pyramids means that when the artificial fish reef according to the present invention is installed on the seabed, gill nets, purse seine nets, seine nets, etc. This means that there are no irregularities that could cause fishing nets to get caught.

To form a prismatic shape, unit reefs of the same size may be stacked, and to form a truncated pyramid, unit reefs of similar shape but gradually smaller may be stacked.

When constructed in the shape of a truncated pyramid, a unit reef as shown in Fig. 1 may be used; By tilting the unit piece from the vertical direction,
It is also a preferable embodiment to use unit reefs connected so that the central reef chamber 3 expands downward, and to stack smaller ones gradually. If a unit reef is used in which each unit piece is inclined, an artificial reef with large changes in liquid flow can be obtained. Moreover, if it is configured in the shape of a truncated pyramid, it will be highly stable against transverse waves, tidal currents, etc.

As described above, the present invention is such that the central reef chamber of one of the vertically adjacent unit reefs is rotated by a certain angle with respect to the other central reef chamber, and the overall external shape of the entire artificial reef constructed by stacking the unit reefs is approximately It has a prismatic shape or a truncated pyramid shape, and a major feature is that there are substantially no irregularities on the side wall surface forming the prismatic pillar or truncated pyramid.

〔Effect of the invention〕

As described above, the outer shape of the artificial fish reef as a whole is approximately prismatic or truncated pyramid-like, and there are substantially no irregularities on the side wall surfaces constituting the prismatic or truncated pyramid, so that there are projections on the outer surface. There are no objects and there is almost no netting. Moreover, since the central reef chambers of the upper and lower adjacent unit reefs are rotated relative to each other, the internal space is complex and varied, providing great visual stimulation and being suitable for protecting young fish, as well as having a great effect on attracting fish. In addition, since the entire structure is composed of a surface structure and a bone structure, there are many types of fish that can be targeted, and since the empty standing rice is large, it has various advantages such as a large capacity for fish.

[Brief explanation of drawings]

FIGS. 1 and 3 are perspective views showing typical embodiments of the unit reef in the present invention, FIG. 2 is an explanatory view showing that the artificial reef of the present invention has a large empty standing area, and FIG.
The figure is a perspective view of a typical embodiment of the artificial reef of the present invention.
Figures 5 and 6 are A to A and B in Figure 4, respectively.
~B sectional view. 1, 1' and 1'' are unit reefs, 2', 2'', 2 and 2''''' are unit pieces, 3 is a central reef chamber, 4',
4'', 4 and 4''''' are auxiliary unit pieces, 5',
5'', 5 and 5''''' are auxiliary fish reef chambers, 6 is a quadrilateral indicating an empty standing space, 7 and 8 are window holes, and 9 is a ceiling plate.

Claims (1)

[Claims] 1. Using a plurality of unit pieces, one end of each unit piece is connected to the intermediate part of another unit piece, and the one end is connected to the intermediate part of the connected unit piece, Furthermore, one end of the other unit piece is joined to form a central reef chamber in the central part, and the free end of each unit piece and the free end of the unit piece whose one end is joined to the intermediate part of the unit piece are connected. In an artificial reef constructed by stacking two or more tiers of unit reefs in which an auxiliary reef chamber with a triangular horizontal cross section is formed by connected auxiliary unit pieces, the upper and lower adjacent unit reefs are When each central reef chamber is projected onto the same horizontal plane, the center points of both central reef chambers are at the same position, and one central reef chamber is relative to the other central reef chamber with the center point as an axis, Located at a position rotated by a certain angle, the overall external shape of the entire artificial fish reef constructed by stacking unit reefs is approximately prismatic or truncated pyramid, and there are substantial irregularities on the side wall surface forming the prismatic or truncated pyramid. An artificial reef characterized by stacking unit reefs to prevent the formation of fish. 2. When the central reef chambers of vertically adjacent unit reefs are projected onto the same horizontal plane, the center points of both central reef chambers are at the same position, and one central reef chamber is located at the center of the other with the central point as the axis. The method according to claim 1, wherein the position rotated by a certain angle with respect to the fish reef chamber is achieved by alternately stacking unit reefs having the same or similar shapes that are overturned vertically and those that are not overturned. Artificial reef.