JPS60207535A - Eight-leg block for 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 The present invention relates to a submerged block for constructing an artificial fish reef intended for the retention and propagation of fish gear.

Fish and other aquatic organisms grow in groups in environments suitable for their habitat, and there are two motivations for this environmental requirement: wooden tablets and spawning. A place suitable for this requirement is a fish reef area where vertical mixing of seawater occurs due to the generation of upwelling currents and eddy currents in shallow waters due to seafloor upheaval. That is,
Due to the vertical mixing of seawater, abundant inorganic nutrients in the seabed and intermediate water promote the proliferation of phytoplankton on the surface,
It is believed that this attracts and settles zooplankton and small fish that feed on it, which in turn causes large fish to migrate and stay there.

By the way, even if a reef is suitable for protecting such fish, it cannot be a good fishing ground unless it is economical enough to justify the expense and labor required to obtain the catch. In addition, there are only a limited number of good fishing grounds in nearby waters, and the development of new fishing grounds is strongly desired, especially as the amount of fish caught has decreased in recent years.

Under such circumstances, the development of artificial reefs is attracting attention as an effective means of developing economic fishing grounds.

However, as an artificial reef, it is possible to attract established fish such as sea bream and flatfish.
In order to develop Al1, it is necessary to have a shady place that blocks direct sunlight and slow ocean currents, which are the preferred environments for these fishes, and this allows them to take root and establish themselves by laying eggs. For that purpose 1. Several types of blocks, such as box-shaped and cylindrical shapes, have been tried as blocks to be sunk for conventional artificial reef construction, but the requirements for these sunken blocks for artificial fish reefs are as follows: In addition to providing a stagnation environment, in particular, the structure must be able to prevent the structure from falling or sliding due to ocean currents, etc., and since the blocks and other structures are bulky and heavy, Reducing production costs such as manufacturing and transportation is most important from a practical standpoint.

Therefore, the present invention has been newly developed from these points of view, and is intended to reduce manufacturing and work costs for construction, in particular, under a shape structure that can be expected to attract fish. For this purpose, cylindrical legs are provided that extend radially from each vertex of the virtual cube, and are joined at the base of each of the eight legs, forming a hollow shell that communicates with each leg at the center of the joint. It is what makes up the body.

Hereinafter, the features of the blocks of the present invention will be explained in further detail with reference to the illustrated embodiments.

Fig. 1 is a perspective view showing one embodiment of the block of the present invention, and Fig. 2 is a plan view thereof. It consists of a hollow body with ... protruding from it. That is, when imagining a cube 4 as shown by the chain line in FIG. , 3... are constructed. Furthermore, these isolegs 3, 3... have a board 5 having the shape shown in FIG. It is a hollow hexagonal column joined to edges B and H by means such as tightening nuts (in this case, an overlapping piece is required on either long edge A or B) or welding. Further, the short perspective edge C of the board 5 is 1/2 the length of the principal of the virtual cube 4, and the center portion 2 where the hexagonal legs 3°3... It is formed by abutting the oblique short edges C of the legs 3, 3, .

Although not shown, other parts of the block of the present invention include, for example, each leg 3.3 that maintains the joined shape of the central portion 2.
The hexagonal base may be a cylindrical or other polygonal column whose hexagonal base is a truncated pyramid. In addition, as shown by the chain lines in the upper part of Fig. 2, the seat plate 12 is attached to the tips of the lower four legs 3, 3, which will serve as supporting legs when the main body is installed, among the eight legs 3, 3... It's okay.

FIG. 4 is a plan view of the leg 3 showing another embodiment of the block of the present invention, in which the base of each side of the hexagonal column is composed of a flat plate part 6, and each side of the hexagonal column is provided with supports 7 such as iron rods. .7 are integrally extended from the flat plate part 6, and a constituent plate (see Fig. 5) with a horizontal plate 10 attached to the outer end is combined, and these supports 7, 7 are assembled.
Thin rods 8, 8, . . . are arranged at intervals to form a hollow cylinder extending from a lattice-shaped outer shell.

Furthermore, in the sixth illustrated configuration showing another embodiment of the leg 3 in another block of the present invention, thin plate support pieces 9, 9 corresponding to the ridges of the hexagonal column are similarly extended integrally from the flat plate portion 6 of the base. 1. A structure (see FIG. 7) to which the Li plate 10 is attached is assembled, and a net 11 made of expander metal or the like is stretched thereon.

Each of the legs 3 shown in FIGS. 4 and 6 may be employed at the height + a I 3 ・= of the main body 1 of the double leg, but for example, when installed, the legs 3 may be positioned above. 4 wooden legs 3
, 3, etc., and its original purpose is to form part of a double leg.

According to the block of the present invention having such a configuration, first, the main body 1 consisting of two legs is manufactured by assembling 5048 flat plates shown in the third figure in the first illustrated embodiment. That is, to constitute one leg 3, the flat plate 5
6 pieces are assembled to form a hexagonal prism, each of which has 8 legs 3
, 3, and so on, the main body 1 can be formed by combining the bases of the legs 3, 3, and so on.

Similarly, when the legs 3 are configured to have a cylindrical or polygonal shape,
With the oblique short edge C of the flat plate 5 as a necessary condition, it is possible to cut each divided plate into an arc shape or bend it into a corner shape by embossing or the like using the six-piece division as a base.

In each of the embodiments shown in FIG. 4 and FIG. 5th force from
This is possible by assembling the illustrated structure or the seventh illustrated structure consisting of the flat plate portion 6, the support piece 9, and the horizontal plate 10. In these cases, the thin rods 8, 8 or the net 11 forming the lattice body may be attached to each of the constituent bodies in advance, or the thin rods 8, 8 or the net body 11 forming the lattice body may be attached to each of the above-mentioned components in advance, or they may be placed around the legs 3 after they are assembled. You can also install it like this.

The blocks of the present invention manufactured in this way are installed by sinking in a pre-planned sea area, but in this case, in addition to being spread out widely on the seabed in a single layer, it is also possible to install them in multiple layers. It is possible to construct several stages at sea by pre-planning and temporarily piling them, or by dumping each stage in sequence.

In artificial fish reefs using blocks of the present invention constructed on the seabed in shallow waters, the lower four wooden legs 3, 3...
Even if it is installed on the seabed, and in this state, the four upper legs 3, 3, which spread out in all directions, are placed randomly without considering the direction of the ocean current at the place where it is installed, Since at least one leg 3 has its end opening facing the direction of the ocean current, a flow of seawater always occurs in the hollow part of the main body 1, and the flow is slower than the ocean current outside. Therefore, the inside of the main body 1 becomes an environment well suited for the retention of small fish. Also, the spread of the eight legs 3, 3... is the main body 1
The outer wall is suitable for creating a seaweed bed and provides an environment preferred by established fish.

On the other hand, when the stationary main body 1 is on a sandy seabed, a sand digging phenomenon occurs on the back side of the grounding legs 3 in the direction of the ocean current, but this phenomenon occurs on the four legs 3° 3... against °C
This happens at the same time, so this will cause you to sink, but not cause you to fall. In addition, since the entire structure is made up of legs that spread out in six directions, it is more susceptible to the pressure of ocean currents than the stability of the installation due to the spread legs. There is also less risk of falling or sliding, and one can expect the durability of the construction.

Furthermore, as in the embodiment shown in FIGS. 4 and 6, the legs 3, 3
If a lattice-like or mesh-like structure is adopted for part or all of the main body 1, the overall load of the main body 1 can be reduced, which is advantageous in terms of material costs, transportation costs, etc. As the amount of water exchanged in the leg 3 increases, light passes into the leg tube, promoting the growth of algae inside the tube and increasing the effect of small fish colonization. By spraying or coating the intended algae spores in advance, a structure well suited for creating a seaweed bed can be obtained.

In this way, the block of the present invention is a hollow octopod block with legs extending in six directions from the center, making the artificial fish reef suitable for the settlement of fish and the migration and retention of large fish. In particular, with the structure of the block of the present invention, a three-dimensional block can be formed by assembling a single structure based on a plate-like structure, so it can be constructed on land or offshore near the installation area (i+). Since assembly on board is limited in capacity, transportation costs can be reduced compared to conventional methods.
- It can be significantly reduced compared to that of a block, and the processing cost can be achieved by single-cutting of a plate-like structure, so it can be produced at a much lower cost, including the material cost. Furthermore, assembly does not require skilled work and requires minimal equipment, and since it is assembled on-site, it can be carried out without the need for large cranes or barges during transportation, making construction work relatively simple and quick. <It is possible to implement it. Furthermore, since the block of the present invention can be freely designed in terms of its size and the shape of its legs, it is possible to manufacture blocks of various shapes according to the purpose, for example, for use with fish, shellfish, or dIj algae. It is possible, and there are great expectations for the future.

The basic shapes and sizes of the blocks of the present invention adopted for implementation are as follows.

Leg length from center: 3.464m Maximum leg diameter length 1.632yn Overall weight 4.793 or 7.189t

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the block of the present invention;
3 is a plan view of the structure in the block of the present invention, FIG. 4 is a plan view of the main part showing another embodiment of the block of the present invention, and FIG. 5 is a plan view of the structure. , FIG. 6 is a plan view of a main part showing still another embodiment of the block of the present invention, and FIG. 7 is a plan view of the same structure. 1...Main body 2...Central part Legs 4...Cube 5...Plate system 6...Flat plate part 7...Strut 8...Bar 9...・ Strut piece 10... Horizontal plate 11... Network patent applicant Nakamura Iron Works Co., Ltd. Figure 1 Figure 3 Figure 4 Figure 6 Off view

Claims (3)

[Claims] (1) Cylindrical legs are provided that extend radially from each vertex of the virtual cube, and these eight legs are connected at their bases to form a hollow shell that communicates with each leg at the center of the connection. A leg block for artificial reefs. (2) A leg block 0 for an artificial fish reef according to claim 1, in which the legs are composed of hexagonal shell columns. (3) A patent claim in which all or some of the eight legs are constructed of a lattice-like structure in which metal rods, etc. are arranged at intervals, or a mesh-like translucent complement made of expander metal, etc. Leg block for artificial reefs as described in Scope 1.