JPH0228696Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a large artificial fish reef that has the function of collecting, protecting and growing fish offshore and on the coast.

As part of Japan's food self-sufficiency plan, the fisheries industry is becoming more and more important, along with agriculture and livestock farming, and the use and development of marine space within a 200 nautical mile area as a source of high-quality protein resources has become an urgent need. I came.

In response to these social conditions, the government implemented the first coastal fishing ground improvement and development project in 1978, and the second coastal fishing ground development project was subsequently planned and implemented in 1988.

These businesses include seed production, child rearing,
These include the creation of fishing grounds and coastal pastures, with artificial reefs being the main facility. However, as development areas move further offshore year by year, reef installation projects are progressing from medium-sized reefs to large reefs, and from artificial reefs to comprehensive marine area development.

The inventors of the present invention paid attention to this point, and as a result of conducting research and research on fish reefs for many years, they devised and succeeded in developing the large artificial fish reef described below. In other words, as mentioned above, in comprehensive sea area development, development of deeper sea areas, for example, 50 m to 200 m deep, is being considered, and the installation of fish reefs in consideration of fish collection and production in such sea areas is being considered. . Normally, the size of the fish reef is required to be about 1/10 to 1/6 of the water depth, and therefore the reef size is also required to be high, about 5 m to 30 m. In order to meet these demands, the present inventors devised a tower-like structure with a lateral spread at the top, which has a good fish-attracting effect, on top of a base made of structures such as steel fish reefs and concrete fish reefs, and has a tower-like structure with a horizontal spread at the top that has a good fish attracting effect. Purse seine for the purpose of providing a large artificial fish reef that is ideal for attracting, protecting and cultivating a wide variety of different types of fish, and that is excellent in stability and safety.
When catching fish using fishing nets such as seine nets, there is a method to prevent the net from getting caught on artificial reefs. The object of the present invention is to provide a large artificial fish reef that is not covered with a net and has a structure that automatically returns to its original state.

Embodiments of the present invention will be described below with reference to the drawings.

The large artificial reef in this invention consists of two main parts. One is the base of a large artificial fish reef constructed of a steel or concrete structure whose main component is steel or concrete, with steel as the main component and concrete as an auxiliary member. 2, and the other 1
One is composed of a tower-like structure 11 whose main constituent material is steel or concrete and which has a horizontal extension at the top.

As shown in FIGS. 1 to 4, which are examples, the shape of the base 2 of the large artificial reef is as follows: As shown in FIGS. An appropriate number of cubic lattice-like spaces are formed by arranging horizontal aggregates and stacking them, and a part of the side surface of the cubic lattice-like space in the upper half is placed at different positions so that they do not overlap each other front to back and left and right. Shielding steel plate 4
One steel block consists of a steel frame member 1 with attached steel frames, and steel blocks of the same height are placed at the four corners of the steel block and are also made of a steel frame member 1 and a steel plate 4 for shielding. A block and a large number of steel blocks made of a steel frame member 1 forming a cubic lattice-like space at half the height of the steel block and arranged evenly around the steel block, and Triangular reinforcing plates are appropriately arranged at the corners of the cubic lattice shape of the steel blocks, and these three types of steel blocks are combined and welded together, and the outer shape of the lower and upper halves of the base body 2 is By attaching the connecting member 3 obliquely above the step edge of the step, a shape having a multi-sided lattice-like space as shown in FIG. 1 is obtained.

An appropriate number of shielding steel plates 4 are attached to the upper half of the base 2 at different positions on a part of the side surfaces of each of the inner and outer lattice spaces so that they do not overlap in the front and back and left and right directions. A steel plate 4 is attached so that the total shielding area is 80 to 100% of the outer peripheral area of the upper half of the base 2, and a slip prevention concrete plate 6 on which concrete for a weight is cast is installed on the bottom surface. ing.

The tower-like structure 11 is attached to the upper part of the base body 2, and at the top of the tower there is a block for collecting fish, which is formed into a funnel-shaped frame 8 by an annular frame and aggregate and has as much horizontal spread as possible, and a tower. The column part 7 is composed of a block having a shape in which a spiral auxiliary member 10 made of round steel is wound around the outside of a frame 9 of shaped steel. It is set up.

The function of this large artificial fish reef is such that the base portion 2 rationally combines a frame structure and a surface structure to create a structure that is effective for the collection and swimming of reef fish and surface and mid-sea fish. In addition, collecting surface and middle layer fish, especially pelagic fish and migratory fish,
In order to have a great effect on swimming, the above-mentioned base 2
A funnel-shaped frame 8 made of the blocks, which has a tower-like structure 11 at the top and has as wide a width as possible at the top.
Fish collection structures have been installed.

This large artificial reef can be used alone to attract fish, but in many cases, depending on the conditions of the sea area where it is installed, it is placed alongside concrete block reefs or constructed concrete reefs, and the synergistic effect results in a greater fish attracting effect. According to the test results of this reef alone, a large number of horse mackerels and yellowtails are seen migrating around the upper layer of the reef, amberjack, horsefish, filefish, and redfish can be seen around the middle layer, and in the lower layer of substrate 2. A collection of red sea bream, stone bream, and moray eel was confirmed inside the substrate 2, and this fish-attracting effect is very large.

To explain this large artificial reef in more detail, the reason why many surface structures are arranged on the upper part of the reef's base is that it changes the flow conditions of the tidal current and generates upwelling currents and eddy currents, which flow into the nutrient-rich submarine current. This method collects small fish that feed on plankton, and also collects fish that feed on these small fish.The surface stimulates the fish's visual sense, the whirlpool sound stimulates their hearing, and the shadow provides protection for their bodies. It provides a hideout for people.

The tower-like structure 11 with a horizontally expanding top is a major feature of this fish reef, and the mechanism of the fish-collecting structure, which consists of a block of funnel-shaped frames 8 with a horizontally expanding top, changes the flow conditions. It generates whirlpool currents that stimulate the fish's visual and auditory senses, and at the same time serves as a hideout and escape for the fish, and the larger the structure is, the more effective it is.

The tower pillar part 7 secures the height of the entire fish reef, and
It stimulates the visual and auditory senses of fish, and serves as a playground for fish that migrate around in groups. The tower pillar part 7 may be a single pipe, but in order to make it appear larger in the visual sense of fish and to achieve a good fish-attracting effect, it should be arranged in a spiral shape around the tower pillar structure made of a shaped steel frame, as shown in Figure 1. It has a steel-wrapped structure.

Incidentally, the cylindrical structure with horizontal expansion at the tower column and the top does not necessarily have to be made of steel, and there is no problem in using steel as an auxiliary member in a structure whose main constituent material is concrete.

In this example, the main constituent material of the reef base is steel, but since the strength of the members is greater than that of concrete, it is easy to manufacture large structures, and it is advantageous for securing a large empty cubic meter. The weight per empty cubic meter is light, making it disadvantageous against slipping or falling due to underwater currents. Therefore, to supplement this, concrete is cast on a part or all of the bottom of the fish reef, and a concrete plate 6 is installed to reinforce it, and the concrete is used as an auxiliary member to prevent the fish reef from sliding or falling.

We have described an example of a large artificial fish reef using steel as the main constituent material, but even if the constituent material is concrete, there are some differences in its fish-attracting effect (with concrete, sessile organisms are somewhat slow to arrive, and fish-collecting time is delayed). However, there is essentially no difference.

Another feature of large artificial reefs with tower-like structures is that the height of the reef can be easily changed without major structural changes, and it is easy to adjust the height of the reef to suit the conditions, water depth, etc. of the area where the reef is installed. The point is that it can be manufactured to

In addition, to explain one embodiment of a large artificial fish reef having such a tower-like structure to have a structure with less netting, the basic structure of this fish reef structure is the same as the steel or concrete fish reef mentioned above. However, as shown in FIGS. 6 and 7, a steel hemispherical object 18 is attached to the center of the tower-like structure 17, and this is a receiving metal fitting provided on the top surface of the steel or concrete reef base 12. A weight 21 is provided at the bottom of the tower-like structure 17, and the weight of the lower part of the central fulcrum is designed to be heavier than the weight of the upper part of the fulcrum. Thus, even if the tower-like structure 17 is tilted, it is constructed so that it can be restored by its own weight. In addition, a columnar structure 22 such as a steel pipe or a concrete pole is used for the columnar part of the tower-like structure 17 so that there is no netting, and the fish-collecting structure 23 with horizontal expansion provided at the top has a hemispherical shape with a concave bottom. Or the mesh is unstructured. Therefore, even if a fishing net catches this large artificial fish reef during fishing, the tower-like structure 17 will tilt, and if the fishing net is not caught or the net comes off, the tower-like structure 17 will return to its original normal state and the fish reef will be closed. This large artificial fish reef, which has a tower-like structure on the upper part of its base, can prevent entanglement.

In this way, the large artificial fish reef of the present invention was developed based on the results of research on fish habits, and it has a multifaceted structure made of steel materials or a combination of steel blocks, a steel structure with a lattice-like space, or the upper part of a concrete structure. By installing a tower-like structure with a horizontally expanding fish-collecting structure at the top, the shape changes greatly at the top, middle, and bottom of the reef, making it possible to obtain a highly varied fish reef. Concrete plates are installed, so they are heavy and have excellent stability by preventing them from sliding or falling due to tidal currents.In addition, the upper half of the base is made of steel plates that shield the space and are placed in different positions so that they do not overlap on the front, back, left and right sides. An effective surface structure is installed on the base, and a circular frame is placed on the top of the tower column, which is erected on the upper part of the base, and a horizontally expanding cylindrical or hemispherical frame made of aggregate is formed into a funnel shape. Because the shaped fish-collecting structure is installed, the flow conditions of the current change, upwelling currents and eddies are generated, and the eutrophic substances on the sea floor generate plankton, which feed on small fish and small fish. A fish reef with a high fish attracting effect can be obtained by attracting fish that want to attract fish, by stimulating the fish's visual sense by the surface, by stimulating the auditory sense by the sound of the whirlpool, and by providing a hideout for fish preservation by the shadow. Therefore, it is possible to obtain an artificial fish reef that has a production function for the purpose of gathering and protecting and breeding surface and reef fish in deep sea areas.
Furthermore, the height of the reef can be easily changed by using the tower-like structure without making any major structural changes, and it is possible to easily manufacture a reef that is suitable for the conditions, water depth, etc. of the water area where the reef is installed. In addition, the tower-like structure, which can be tilted and restored, will serve as a fish reef without netting, and will play an extremely important role in Japan's food self-sufficiency plan as a facility for supplying high-quality fish protein through effective use in future coastal fishing ground improvement and development projects. To a large extent, the present invention is beneficial and meets current social needs.

[Brief explanation of the drawing]

The figures show one embodiment of a large artificial fish reef of this invention. Figure 1 is a side view, and Figure 2 is A-A of Figure 1.
Figure 3 is a cross-sectional view taken along line C-C in Figure 1, and the lower half of the drawing is taken along line D-D.
A cross-sectional plan view showing a cross section, Figure 4 is a diagram of each block constructing this large artificial reef, Figure 5 is an enlarged perspective view of Figure 1, and Figures 6 to 8 are a tower-like structure with little netting. This is a diagram related to large artificial reefs with
The figure is a perspective view, FIG. 7 is a side view, and FIG. 8 is an enlarged sectional view of the tilting support mechanism of the tower-like structure. 1...Steel frame material, 2 and 12...Base made of steel structure or concrete structure, 7 and 2
2... Tower column part, 8... Fish gathering structure using a funnel-shaped frame, 11, 17... Tower-like structure, A, B, C,
D, E...Block.

Claims (1)

[Scope of utility model registration request] A large artificial fish reef whose main constituent material is steel or concrete, with a large number of multi-sided lattice-like spaces made of a combination of steel or steel blocks or concrete, and in the case of steel, a concrete plate is laid on the bottom of the frame, In addition, shielding steel plates are installed on a part of the sides of each grid-like space inside and outside the upper half at different positions so that they do not overlap front to back and left and right, and on the outer periphery side at an angle that tapers upward. A base made of a steel structure or concrete structure with joint members, a tower column at the center of the base, an annular frame and aggregate at its upper end to form a funnel-shaped cylinder or an upwardly expanding hemisphere. A large artificial fish reef comprising a tower-like structure forming a horizontally expanding fish-collecting structure, and a tower-like structure having a tower section provided on the base body.