JPH03108430A - Block for man-made gathering-place for fish - Google Patents

Abstract

PURPOSE:To obtain blocks for man-made gathering-place for fish made of concrete of wall structure, by opening the top and the bottom of hexahedron, forming triangular water pass ports at the upper part of peripheral four faces of the same shape, sinking the hexahedron and spirally raising sea water. CONSTITUTION:The objective blocks for man-made gathering-place for fish wherein each block has wholly a hexahedron, the top and the bottom faces have no wall, are totally opened, the remaining four faces are wholly in the same shape and, for example, the right upper part has a wall structure wherein a wall face 2 is cut out on a slant face 2a dropping right to form a triangular water pass port 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a concrete fish reef block that is sunk in the ocean floor to attract fish.

[Conventional technology]

Conventionally, concrete fish reef blocks have been used in various shapes, and due to their nature, these fish reef blocks form sufficient gaps for fish to swim, and have a large surface area for sessile organisms to adhere to. A contradictory shape is required, and it is also required that it be easy to manufacture using a mold.

[Problem to be solved by the invention]

Therefore, research on fish reef blocks and benthic fishes (many of which are high-grade fish) has progressed in recent years, and it has become clear what kind of reef blocks are where benthic fish tend to gather.

As a result, it was found that in addition to the conditions shown in the above-mentioned prior art, the upwelling of seawater in a spiral pattern by the fish reef block brought about a very good effect.

However, the structure that allows seawater to rise in a spiral pattern is complicated, making it difficult to manufacture it using concrete using formwork.

[Means to solve problems]

Therefore, the present invention has a wall structure in which the top and bottom of the hexahedron are completely open, all four surrounding sides are the same shape, and the wall surface is cut diagonally so as to form an almost triangular water outlet at the top of either the left or right side of each side. It is characterized by what it did.

[For production]

According to the present invention described above, by forming triangular water inlets by cutting out the wall surface with slopes at the same position on the four surrounding sides, the seawater flowing into the block winds up in a spiral shape and upwells. This upwelling current lifts up nutrients on the ocean floor, attracting plankton that feed on them, and as a result guides the migration of schools of fish.Also, since the wall structure has a large wall area, it is possible to enjoy abalone and turban shells. It is possible to increase the area on which sessile organisms such as sessile organisms can settle, and furthermore, these wall surfaces can provide stimulation to bottom-dwelling fishes, which are high-grade fishes, and encourage their colonization.

〔Example] Examples of the present invention will be described below using the oral surface.

FIG. 1 is a perspective view, and FIG. 2 is a front view. The entire structure is hexahedral, and both upper and lower surfaces are completely open without walls.

The remaining four sides are all the same shape, and the block has a wall structure in which the wall surface 2 is cut out by a slope 2a that slopes downward to the right to form a nearly triangular water inlet 1 at the upper right, and the wall surface 2 at the lower left has a Taber surface. A circular or polygonal through hole 3 having a diameter is an opening.

In the above explanation, the water inlet l was formed in the upper right corner, but the same effect can be achieved even if it is formed in the upper left corner in a symmetrical position, and accordingly all other positions should be formed in symmetrical positions with respect to the above embodiment. It is exactly the same.

To explain in more detail, since the present invention is a wall structure block, there are no columns or beams at the four corners.Therefore, a part of the wall 2b is left around the upper part, and in order to further strengthen the lower part, seawater In order to make the water rise up in a spiral shape, a triangular water inlet 1 is formed by a slope 2a, and an extension wall 2c of the wall surface 2 is left below.

Several types of length, width, height, and depth dimensions are predetermined, and the shape is formed using prefabricated molds of each dimension.

Therefore, as shown in FIG. 2, when viewed from the front (side), the water inlet 1 forms a substantially isosceles triangular through hole.

According to the embodiment with the above configuration, the water inlet 1 is formed by cutting out the wall surface 2 with the slope 2a that slopes downward to the right on the four surrounding sides, so that the seawater flowing into the block is spirally wound to the right. It will upwell, and at that time, the upwelling force will be further strengthened by the inflow of seawater from the through hole 3.

In the above embodiment, since the water inlet 1 is located at the upper right, the seawater rises up in a right-handed spiral, but if it is formed at the upper left, the seawater flows in a left-handed spiral. It will rise.

In addition to the function of agitating the seawater in the block by the seawater entering through the hole 3 as described above, the through hole 3 also functions to maintain the shape of the mold during molding.

〔Effect of the invention〕

According to the present invention described in detail above, the top and bottom of the hexahedron are completely open, all four surrounding sides are the same shape, and the wall surface is cut diagonally so that a substantially triangular water passage is formed at the top of one of the left and right sides of each side. By making it into a wall structure block, the following effects are achieved.

■Seawater that flows in through the waterway spirals up and upwells, lifting up nutrients from the ocean floor, attracting plankton that feed on these salts, and as a result, has the effect of guiding the migration of fish schools.

■Since the structure is mainly composed of walls, it provides a good stimulus to bottom-dwelling fish and has the effect of encouraging their collection.

■Since the structure is mainly composed of walls, the adhesion area is wide, which has the effect of increasing the number of attached organisms.

- Because the center of gravity is low, it has the effect of being able to be installed in a predetermined state even when submerged by the underwater drop method, and has the effect of being highly stable after installation.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a front view. 1...Water port 2...Wall surface 2a...Slope 3...Through hole

Claims (1)

[Claims] 1. A fish reef block with a wall structure in which the top and bottom of the hexahedron are completely open, all four surrounding sides are the same shape, and the wall surface is diagonally cut out to form a roughly triangular water opening at the top of either the left or right side of each side.