JPH0228697Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an artificial reef made of steel, which comprises an artificial reef body made of steel and a cage-like net made of steel.

(Prior Art) Artificial reefs have been known for a long time, but the development of artificial reefs has become active especially with the 200 nautical mile problem as an opportunity. In other words, artificial reefs need to be able to maintain an environment that makes it easier for fish to gather and grow, and also to not have a negative impact on the activities of fishing vessels or the lifespan of fishing nets, and to save labor for fishermen. There is a strong desire for it to be able to perform its functions as well. However, no conventional artificial reef has been found that satisfies the above-mentioned functions.

For example, artificial reefs have traditionally been made of steel, concrete, resin, etc., and the shape of the artificial reef has been designed to improve the trapping effect mainly by having a complex uneven surface on the outer circumferential surface. Therefore, this is one of the reasons why the fishing net gets caught between the protruding parts (ends) of the artificial reef or between the reef forming members when fishing with sashimi nets, etc., resulting in damage to the fishing net and loss of fish. It has the disadvantage that it cannot be captured.

Furthermore, as shown in, for example, Japanese Utility Model Publication No. 47-41676 and Japanese Utility Model Application Publication No. 55-65974, artificial reefs have been proposed in which the shape of the outer periphery is improved to reduce uneven surfaces. However, the former type of artificial reef is manufactured using only iron wire, which is a type of metal material, so its own weight is limited. In addition, the sunken fish reef cannot be installed offshore or in the deep sea, as there is a risk that it may be moved or deformed due to the influence of tides and waves during typhoons and storms. The problem is that the range is limited. Furthermore, since the fish reef is constructed only with iron wire, during normal tidal currents (other than during typhoons and storms), upwelling currents and eddies due to the shielding effect of the tidal current can hardly be expected in the reef area, so for example, It has the disadvantage that it is difficult to attract surface-dwelling fish, and therefore, it is difficult to expect a good attracting effect.

In the latter case, artificial fish reefs are made of steel pipes, a type of steel material, and the head of the central column protrudes, so there is a risk that the fishing net may get caught in the protruding part of the central column and be damaged. If installed in a shallow place, there is a risk that the bottom of the fishing boat will collide with the protruding part of the central support.

For the reasons mentioned above, artificial fish reefs should not only have a trapping effect, but also have functions that can be installed offshore or in the deep sea, and will not have a negative impact on the activities of fishing boats or the lifespan of fishing nets. is required.

(Purpose and structure of the invention) The purpose of the invention is to provide an artificial fish reef made of steel that can advantageously solve the above-mentioned problems. The artificial reef body 4 is constructed by combining with steel materials,
A large number of steel guide/holding frame members 1 consisting of a vertical portion and an arc-shaped portion connected to the top of the vertical portion are arranged side by side to form a circle, and the inside of each guide/holding frame member 1 is arranged side by side to form a circle. A large number of annular steel circumferential frame members 2 that intersect with each other are arranged at intervals in the vertical direction and fixed to each guide/holding frame member 1 to constitute a steel birdcage-shaped net 3. A birdcage-like net 3 is provided so as to surround a part other than the bottom of the artificial reef main body 4, and a gap 9 is provided between the artificial reef main body 4 and the birdcage-like net 3 in the artificial reef made of steel.

(Example) Next, the present invention will be explained in detail by referring to the illustrated example.

First, the artificial reef made of steel according to the present invention is roughly divided into an artificial reef body and a birdcage-shaped net surrounding the artificial reef body.

FIG. 1 shows a birdcage-shaped net 3.
A large number of steel guide/holding frame members 1 consisting of a vertical portion and an arcuate portion integrally connected above the vertical portion.
are arranged at approximately equal intervals so as to form a circle, and a large number of annular steel circumferential frame members 2 are arranged at intervals in the vertical direction, intersecting inside each guide/holding frame member 1. The circumferential frame member 2
are fixed by welding in contact with the inner part of each guide/holding frame member 1.

The diameter of the circumferential frame member 2 fixed to the arc-shaped portion of the guide/holding frame member 1 decreases depending on the distance from the center of the circle to the fixing point. Further, the upper portions of some of the guide/holding frame members 1 facing in the diameter direction of the circle are continuously arched, and each guide/holding frame member 1 and each circumferential frame member 2 are used for passage of fish. A mesh is formed. As the steel material constituting the guide/holding frame member 1 and the circumferential frame member 2, for example, a steel pipe or a steel rod having a circular cross section is used.

FIG. 2 shows an example of an artificial reef main body 4 made of steel, in which a plate-shaped steel material 9 and a non-plate-shaped steel material are combined and connected by welding or the like to produce a fish reef construction block 5 having a frame structure. The artificial reef main body 4 is constructed by connecting a plurality (five in FIG. 2) of reef-constituting blocks 5 to these blocks by means of joint beams 6, etc., which are fixed by welding or the like. Furthermore, the second
In the figure, 7 is a central column.

The plate-shaped steel material 9 is fixed by welding or the like to a location based on the design specifications of the fish reef body 4. The plate-shaped steel material 9 causes a shielding effect on the tidal current passing through the steel artificial reef body 4, that is, changes in flow direction, flow velocity, and other physical change phenomena. It can also improve the effect of attracting fish. Note that most of the members constituting the artificial reef body 4 are steel pipes and shaped steel.

FIG. 3 shows the entire steel artificial reef according to an embodiment of the present invention, which is constructed by covering and fixing the birdcage-shaped net 3 shown in FIG. 1 over the artificial reef main body 4 shown in FIG. 2. , the birdcage-like net 3 is provided so as to surround a portion other than the bottom of the artificial reef main body 4, and a large number of steel support members 8 are arranged between the birdcage-like net 3 and the artificial reef main body 4. It is fixed by welding, and a gap 10 is provided between the side of the artificial reef body 4 and the birdcage-like net 3.

In the case of the steel artificial fish reef constructed as described above, the large number of guide/holding frame members 1 are arranged outside the large number of annular circumferential frame members 2, so that gill nets, spread nets, etc. When laying fishing nets and hoisting,
The fishing net will not be damaged even if it is hung in the birdcage-like net 3.

(Effects of the invention) Since the present invention is configured as described above, it produces the following effects.

When a fishing net such as a sash net is dropped, the fishing net smoothly slides down the outer surface of the guide/holding frame member 1 in the birdcage-like net 3 covering the fish reef body 4. The fishing net can be easily stretched in a predetermined position without getting caught, and the fishing net is smoothly guided along the outer surface of the guide/holding frame member 1, making it easy to set up and hoist the fishing net. It can significantly save labor,
Furthermore, since the birdcage-shaped net 3 is placed over the artificial reef body 4, the horizontal projected area, etc. becomes larger, and the gap 10 between the birdcage-shaped net 3 and the artificial reef body 4 also has a reef effect, and the orientation It is possible to collect fish species that take action (horse mackerel, mackerel, yellowtail, etc.), and therefore the effect of collecting fish can be improved. Furthermore, since the artificial reef main body 4 is equipped with a plate-shaped steel material 9, the plate-shaped steel material 9 produces a shielding effect on the tidal current passing through the artificial fish reef main body 4, that is, a change in the flow direction, a change in the flow velocity, etc. It is possible to improve the attracting effect not only for benthic fish but also for surface-dwelling fish.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a birdcage-like net, FIG. 2 is a perspective view of the artificial reef body, and FIG. 3 is a perspective view of an artificial reef made of steel according to an embodiment of the present invention. In the figure, 1 is a steel guide/holding frame member;
2 is a circumferential frame member made of steel, 3 is a birdcage-like net made of steel, 4 is an artificial reef body made of steel, 5 is a reef construction block made of steel, 6 is a joint beam, 7 is a central support, and 8 is a A steel support member, 9 a steel plate, 10 a gap, and 11 an artificial reef made of steel.

Claims (1)

[Scope of utility model registration request] The artificial reef main body 4 is constructed by combining plate-shaped steel materials 9 and non-plate-shaped steel materials, and includes a large number of steel guide and holding frame members consisting of a vertical portion and an arc-shaped portion connected to the top of the vertical portion. 1 are arranged side by side to form a circle, and a large number of annular steel circumferential frame members 2 intersect inside each guide/holding frame member 1.
are arranged at intervals in the vertical direction and fixed to each guide/holding frame member 1, and the steel birdcage-shaped nets 3
, and the birdcage-like net 3 is provided so as to surround a portion other than the bottom of the artificial reef body 4,
A gap 1 is provided between the artificial fish reef body 4 and the birdcage-like net 3.
Artificial fish reef made of steel with 0.