JPS61158730A - Artificial fish bank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Technical field) The present invention relates to artificial fishing reefs.

(Prior Art) Artificial fishing reefs have been proposed that are comprised of a hemispherical hollow body provided with a plurality of windows and a disc-shaped pedestal joined to the open end of the hollow body.

This artificial fishing reef is used with the pedestal in contact with the bottom of the water, that is, with the hollow body on the top and the pedestal on the bottom.By making the hollow body semispherical, it is possible to attach the fishing net to the artificial reef during fishing operations. Entanglement is prevented and damage to the fishing net is prevented.

Artificial reefs can usually be installed on the bottom of the water using a lifting device installed on a barge. However, although this installation method allows the artificial reef to be installed at a target location accurately and in a desired orientation, it has the disadvantage that it requires a great deal of time and effort for installation.

One method to eliminate this drawback is to install an artificial fishing reef by submerging it in water and then lowering it by itself into the water to land on the bottom. According to this method, the installation time and labor can be reduced, and the equipment required for installation can be made small-scale. However, it is also possible to accurately reach the target installation point and install the artificial reef in the desired posture. It becomes extremely difficult to do so.

(Objective) Therefore, an object of the present invention is to create an artificial fishing reef that can land on the bottom in a desired attitude and reach the target installation point as accurately as possible, and that can be installed in a short time and with less labor. It is about providing.

(Structure) The present invention provides a cap-shaped hollow body having a top portion provided with an opening and a bottom portion having an opening larger than the area of the opening; a weight provided in the hollow body;
It is characterized by comprising a plurality of vanes for causing the hollow body to rotate about its axis while the hollow body is descending into the water.

(Operations and Effects) According to the artificial fishing reef according to the present invention, while descending in the water due to its own weight, the hollow body is oriented by the weight so that its top part faces the water surface side and its bottom part faces the water bottom side, Reach the bottom in this position. Also, during this lowering of the hollow body, water impinges on the plurality of vanes provided on the hollow body, causing the hollow body to rotate around its axis. Due to this rotation, the hollow body is prevented from swinging in the water due to the resistance of water exerted during descent, and moves toward the bottom of the water on a substantially vertical line. This makes it possible to reach the target installation point of the artificial reef.

(Embodiments) The features of the present invention will become clearer from the following description of the illustrated embodiments.

As shown in FIGS. 1 to 3, an artificial fishing reef 10 according to the present invention includes a cap-shaped hollow body 12, a weight 14 and a plurality of blades 16 provided in the hollow body.

The artificial fishing reef 10 is installed in the ocean, a lake, or the like, with the top 12a of the hollow body 12 facing the water surface and the bottom 12b facing the bottom.

The top 12a of the hollow body is provided with a circular opening 18. When lowering the hollow body alone into the water for installation of an artificial fishing reef, that is, without using a lifting device (not shown). When the water is lowered through the water by its own weight, the water flows relatively inside the hollow body 12 from the opening at the bottom 12b of the hollow body toward the opening 18 at the top 12a. The size of the opening 18 is set to be less than or equal to the opening area of the bottom portion 12b.

The hollow body 12 may be formed to have a cylindrical or prismatic shape as a whole, but in order to reduce the rotational resistance during rotation of the hollow body, which will be described later, and after installing the artificial fishing reef 10, it may be formed to have a cylindrical or prismatic shape. Fish nets caught in artificial fishing @io (
In order to avoid the damage caused by shading), use a solid body whose outer surface diameter gradually increases from the top 12a to the bottom 12b, such as a hemispherical surface, a paraboloid of revolution, or a truncated conical surface as shown in Figure 1. It is desirable to form the hollow body 1 with
It is desirable that the inner surface of No. 2 has the same curved surface as the outer surface.

The hollow body 12 is further provided with a plurality of circular openings 20 outside the opening 18 for the entry and exit of fish. They are arranged at equal intervals in the circumferential direction on the level. When each opening 20 has a different diameter, the flow rate and flow rate of water flowing out from each opening 20 will be different, causing the hollow body 12 to tilt during descent. opening 1
The total opening area of the openings 8 and 20 is less than or equal to the area of the openings in the bottom portion 12b.

When providing a plurality of openings 20, forming the openings 18 can be omitted. In this case, in addition to the above example of having the same diameter and therefore the same area of all the openings 20 at the same level and the same distance between the openings, the fourth a.
As shown, multiple apertures of different diameters can be arranged at multiple levels. A plurality of small-diameter openings 20a and a plurality of large-diameter openings 20b are arranged at each level, and the mutual spacing of the small-diameter openings 20a is the same, and the mutual spacing of the large-diameter openings 20b is the same. As long as two or more openings located on one level have the same area, there may be three or more types of openings with different areas, and the openings may be arranged on three or more levels. .

Further, as shown in FIG. 4b, the intersection line Li between the hollow body 12 and a plurality of vertical planes (not shown) extending radially from the axis of the hollow body 12 and intersecting each other at equal angles The sum of the areas of the openings located on each crossing line LL may be the same. In the illustrated example, openings 20a having different sizes and areas on each crossing line LL are arranged on each crossing line LL.
, 20b are arranged, and each intersecting line.

The number of types of openings having nine different areas with the same sum of the areas of the openings located above may be one or three or more types, and furthermore, the types of openings on each intersection line L1 are the openings on each intersection line Li. As long as the sum of the areas of
By keeping the flow rate of water flowing through all the upper openings the same, it is possible to prevent the hollow body 12 from tilting while descending in the water. Also in the example of FIGS. 4a and 4b, the area of the entire opening 20 is less than or equal to the opening area of the bottom portion 12b.

The material constituting the hollow body 12 can be concrete, stainless steel, a corrosion-resistant metal material such as galvanized steel, a plastic material, or a ceramic material. Further, the opening at the bottom 12b, the opening 18 at the top, and the other openings 20 may be oval, oval, or polygonal such as a triangle or rectangle instead of being circular.

Heavy i! 14 serves to direct the bottom part 12b of the hollow body 12 descending into the water toward the bottom of the water when the hollow body 12 is made of a material whose specific gravity is higher than that of water; If configured, 4 like this
In either case, it is preferable that the weight 14 is placed as low as possible in the hollow body 12. This allows the hollow body 12 to be turned upside down due to tidal currents, etc. By doing so, or inverting, the top portion 12a is prevented from moving downward and the open bottom portion 12b is prevented from moving upward.

The weight 14 can be constituted by an annular plate made of concrete, metal, etc., joined to the open end surface of the bottom 12b of the hollow body 12. A weight 14 made of this annular plate
is arranged concentrically with the opening in the bottom 12b and the opening 18 in the top, its inner diameter is smaller than the diameter of the opening in the bottom 12b of the hollow body 12 and larger than the diameter of the opening 18 in the top, and its outer diameter is larger than the diameter of the opening in the bottom portion 12b, in this example, the opening in the annular plate is substantially
Define an opening at the bottom of the hollow body 12.

Heavy! ! 14 is made of the annular plate, the inner diameter or outer diameter is set differently from the above example, so that the inner circumferential surface of the annular plate touches the outer surface of the hollow body 12, or the outer circumference The foam can be applied so that the surface is in contact with the inner surface of the hollow body 12.

The weight 14 can be constituted by an annular plate whose inner periphery forms the sides of a polygon such as a triangle, rectangle, or pentagon when viewed from above. In this case, the outer periphery can also form the sides of the polygon, but as described with respect to the hollow body 12, it is preferable to make it circular in order to minimize rotational resistance. As shown in Figure 3, in addition to making the single weight 14 an annular plate, it is preferable to make the side surface an inclined surface whose diameter gradually increases from the top to the bottom. 14 can be prevented from being shaded as described above.

5a to 5d show examples of joining the hollow body 12 and the weight 14 made of an annular plate.

In the example shown in FIG. 5a, the hollow body 12 and the weight 14 are integrally molded from reinforced concrete.

In the example shown in FIG. 5b, the hollow body 12 is molded from a plastic material, and the bottom portion 12b is provided with a protrusion 24 projecting radially outward from the outer surface thereof. This protrusion 24 is buried in the concrete weight 14, and the hollow part 12 and the weight 1
4 is prevented from separating.

In the example shown in FIG. 5C, the hollow body 12 and the weight 14 are both formed of concrete, and the bottom portion 12b of the hollow body is provided with a flange 26 that projects radially inward from the inner surface thereof. A partially exposed insert 28 is embedded in the weight 14 and is made of a corrosion-resistant material such as stainless steel, galvanized material, plastic, or ceramic. The hollow body 12 and the weight 14 are connected to the flange 2
6 and threadedly engaged with the insert 28, which is likewise made of a corrosion-resistant material. Note that the bolt 30 is tightened using a weight 1.
This can be done by inserting your hand through the opening in number 4.

Further, FIG. 5d shows an example in which the hollow body 12 and the weight 1114, both of which are formed of concrete, are connected via a pin 32 and a chuck 34 that receives the pin 32.

The pin 32 is embedded in the thicker bottom portion 12b of the top portion 12a with a portion protruding downward. On the other hand, the chuck 34 includes a socket 34a embedded in the weight 14 with its open end facing upward and exposed, and a pawl ring 34b made of spring steel and having a plurality of pawls in the center, held in the socket. Become. When the pin 32 is inserted through the pawl ring 34b, the pawl grips the pin 32 while surrounding it, and the pin 32 is prevented from being pulled out from the socket 34a. Weight 1
4 are integrally connected.

Instead of the above-described example, the weight 14 may be composed of a plurality of metal pieces (not shown) of equal weight embedded in the bottom portion 12b at equal intervals in the circumferential direction.

The plurality of vanes 16 are equally spaced from each other and are provided to cause the hollow body 12 to rotate about its axis during its descent into the water.

The vanes 16 can be attached to the inner surface of the hollow body 12. A cylinder 22 having the same diameter as the opening 18 and concentric with the opening 18 is provided on the inner surface of the top portion 12a of the hollow body, and one end 1 of each band-shaped blade 16 is provided on the circumferential surface of the cylinder.
6a is connected. On the other hand, the other end 16b of each blade 16
terminates within the open end surface of the hollow body 12 and is in contact with the weight 14.

The plurality of blades 16 are arranged at regular intervals and are curved in the same direction when viewed in a plane. As a result, the artificial part @10
Therefore, while the hollow body 12 is descending into the water, the water flowing relatively from the bottom L2b toward the top 12a is transferred to each blade 16.
At this time, the hollow body 12 is rotated counterclockwise as viewed in FIG. This rotational movement continues until the artificial fishing reef 10 reaches the bottom where it stops descending.The hollow body 12, which descends while making zero rotation, exhibits a rocking phenomenon due to water resistance that occurs when descending in a non-rotating state. First, the hollow body 12 descends straight along the vertical line. This allows the artificial part @10 to reach the target point accurately.

FIG. 6 shows another example of the artificial fishing reef 10. In this example, the hollow body 12 is provided with at least one (four in the illustrated example) openings 20, and the openings in the bottom 12b of the hollow body 12 are It is closed by a disk-shaped closing plate 21. The material constituting the closing plate 21 may be the same as or different from the hollow body 12, and if they are the same, the hollow body 12 and the closing plate 21 may be integrally formed. Good too.

Further, the shape of the blade 16 and its mounting position are not limited as long as it can cause the hollow body 12 to rotate.

In the example shown in FIG. 6, the weight 14 is composed of a ring surrounding the bottom 12b, and this ring is
2b, and is supported via a plurality of blades 16 having both ends fixed thereto. In the artificial fishing reef 10 of this example, a hollow body 12 filled with water flowing through an opening 20 is lowered underwater by the rotational force of curved plate-shaped blades 16 arranged around the hollow body 12.

Furthermore, as shown in FIGS. 7 and 8, a blade 16 having a shape similar to that used in a blower, one end of which is fixed to a post 36, is used, and this is attached to the opening of the annular weight 14. It can be arranged concentrically within the opening and the other end can be fixed to the inner peripheral surface 14a that is the peripheral wall of the opening.

Further, as shown in FIGS. 9 and 10, by providing a plurality of radially extending slits 38 (six in the illustrated example) around the opening of the annular weight 14, three and three slits 38 are provided. A vane 16 can be formed in between. However, a pair of opposing parallel side surfaces 38a extending in the radial direction and defining the slit 38 are inclined with respect to a plane perpendicular to the weight 14.

Examples shown in FIGS. 7 and 8 and FIGS. 9 and 10
In the case of the example shown in the figure, when the artificial reef IO descends in the water, water flows into the hollow body 12 between the vanes 16 and through the openings of the weight 14 and flows out through the openings 18.20. . When the water flows in, rotational force is applied to the blades 16, thereby causing the hollow pair 12 to rotate in one direction and move toward the bottom of the water.

The artificial fishing reef 10 according to the present invention has a top portion 12a of the hollow body 12.
It can be installed by floating it on the surface of the water with the bottom part 12b on the upper side and the bottom part 12b on the lower side, and then submerging it in water in this position. It can also be installed by dropping the artificial part @10 from a barge and submerging it in water. However, in this case, care must be taken to ensure that the hollow body 12 filled with water does not become upside down immediately after the artificial fishing reef 10 lands on the water.

In the example of FIGS. 1 to 3, the blades 16 attached to the inner surface of the hollow body 12 also function as reinforcing ribs of the hollow body 12, and when the artificial fishing reefs 10 are submerged and installed one after another, the blades 16 are first attached to the hollow body 12. It is possible to prevent mutual destruction, damage, etc. due to the next artificial fishing reef IO colliding with the bottomed artificial fishing reef IO.

[Brief Description of the Drawings] Fig. 1 is a perspective view of an artificial fishing reef according to the present invention, Fig. 2 is a plan view of the artificial fishing reef, Fig. 3 is a side view of the artificial fishing reef, and Figs. 4a and 4b are openings. Figures 5a, 5b, 5c, and 5d are explanatory diagrams in which the hollow body is provided at a location other than the top of the hollow body. FIG. 6 is a partially cutaway perspective view of another example of an artificial fishing reef, and FIG. 7 is a partial view of another example of a blade. 8 is a cross-sectional view taken along line 8-8 of FIG. 7; FIG. 9 is a cross-sectional view similar to FIG. 8 showing another example of the blade; and FIG. Figure 9! FIG. 110 is a partial longitudinal section taken along line 110-to; 10: Artificial fishing reef, 12: Hollow body, 12a, 12b
: Top and bottom of hollow body, 14: Weight, 1
6: Feather. 18: opening, 20: window. 21: Occlusion plate. Agent Patent Attorney Nobuyuki Matsunaga Figure 1 Figure 2-〇 Figure 5゜ Figure 5b Figure IA75C Figure 5d Figure 7 Figure 1 Old

Claims (7)

[Claims] (1) An artificial fishing reef that is installed through individual descent into the water and landing on the bottom, which is a cap-shaped hollow body that has a top portion with an opening and a bottom portion with an opening larger than the area of the opening. a weight provided on the hollow body to prevent the hollow body from turning over in water; an artificial fishing reef, including a plurality of blades for producing a fishing reef; (2) The artificial reef according to claim 1, wherein the hollow body has an outer surface whose diameter gradually increases from the top to the bottom. (3) The weight is comprised of an annular plate concentrically joined to the bottom of the hollow body.
) Artificial fishing reefs as described in section 2. (4) The artificial fishing reef according to claim (1), wherein the weight is embedded in the bottom of the hollow body. (5) The artificial reef according to claim (1), wherein the blade is attached to the inner surface of the hollow body. (6) A cap that is an artificial fishing reef that is installed through individual descent into the water and landing on the bottom, with a bottom having a plurality of openings and an opening area larger than the sum of the areas of the openings. a hollow body having a shape, a weight provided on the hollow body to prevent the hollow body from turning over in water; a plurality of blades for causing rotation around an axis, the openings being on a circumference at one or more levels and having the same opening area located on the same circumference and having the same mutual spacing. or, the opening is on a line of intersection between the hollow body and a plurality of vertical planes extending radially from the axis of the hollow body and intersecting each other at equal angles, and the opening is on each line of intersection. An artificial fishing reef where the sum of the areas of the openings located at is the same. (7) An artificial fishing reef that is installed through individual descent into water and landing on the bottom, which includes a hollow body that is cap-shaped, has at least one opening, and has a closed open bottom; a weight provided on the hollow body to prevent the hollow body from reversing; and a plurality of weights provided on the hollow body for causing the hollow body to rotate about its axis while the hollow body is lowered in water Artificial fishing reef, including feathers.