JPH09163893A - Artificial fish reef of shell type concrete block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial fish reef capable of avoiding embedding in drift sand, carrying out the stable installation even in an irregular pond and ensuring the raising of sea tangles and safety of larvae by integrally piling up natural stones on the surface of a shell type concrete block having three legs capable of freely regulating the length thereof. SOLUTION: This artificial fish reef of a shell type block concrete is obtained by integrally piling up large-sized natural stones 12 through an adhesive such as a mortar on the side of a solid shell type concrete block 10 prepared by simultaneously molding three legs 11 capable of freely regulating the length according to the depth of an installation spot at the base when performing inverted molding. Furthermore, the natural stones 12 are selected from granites, boulders, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial fish reef, and more particularly to an artificial fish reef composed of a planting block in which boulders (natural stones) are put on the surface of a shell type concrete block.

[0002]

2. Description of the Related Art Among various artificial fish reefs, an artificial fish reef formed by arranging boulders (natural stones) on the surface of a shell-type concrete block is excellent in the following points. In other words, the shell (sea turtle) type has excellent anti-tide stability, and the presence of boulders on the surface makes it easy to cure spores and prevent the roots from separating. It has the advantage that it does not hurt, and that the unevenness of the boulders can be used as a sea urchin and abalone reef because it becomes a habitat for larvae of the sea urchin and abalone.

Further, the kelp that has settled on natural stones has a much higher quality than that which has settled on concrete works (wave-dissipating blocks, caisson, etc.), and most of the kelp is cured on the upward surface. It is easy to do, and the surface of the shell-shaped upper shank is suitable for kelp, and so on. As a proposal of this type, Japanese Utility Model Laid-Open No. 59-73173 discloses, "The peripheral surface of the artificial fish reef main body is formed of a concrete surface with exposed aggregates, and the peripheral surface of the fish reef main body is provided with appropriate unevenness and roughness. Since it is applied to the surface, it can promote the establishment and growth of shellfish, seaweed, etc., and also enhance the effect of collecting fish. "

That is, as shown in FIG. 4, a hollow shell-type concrete block 1 in which through holes 2, ..., Which prevent the kelp from growing densely, are evenly arranged, is mounted on a ring-shaped base frame 3 and has an inverted bowl shape. The surface is a rough surface with small aggregates of natural stone exposed. On the other hand, what is shown in FIG. 5 is also provided on the market. That is, this one uses a form made by dividing a hollow shell type concrete block 4 into four parts, first forms a surface layer with boulders 5, ... Is taken out and sand is removed to leave the uneven boulders 5, ... on the surface, and the four blocks are bolted 6 ,. The shell-type concrete block 4 is mounted on a ring-shaped base frame 7 as in the case of FIG. A part of the large boulder 5 is exposed. The through holes 8, ... Are provided similarly to those in FIG.

[0005]

SUMMARY OF THE INVENTION In the above, an artificial fish reef of a shell type concrete block whose surface texture is extremely suitable for curing kelp, sea urchin, abalone, etc., has the following drawbacks. Have. That is, (1) both the ones in FIG. 4 and the ones in FIG. 5 have natural stones arranged on the surface, but the ones in FIG. 4 have too small an exposure scale and the ones in FIG. Since the inner surface of the concrete formwork is a curved surface, the sand layer thickness for surface layer formation is thin, the degree of exposure of the boulders from the concrete layer must be small, and the total area of natural stone is small,
Moreover, since the degree of unevenness is small, it is incomplete in terms of safety as a habitat for kelp and larvae. (2) Since the ground contact surface is the ring-shaped base frames 3 and 7, there is a case where the uneven seabed does not make a stable landing, and the slope or the bottom can be looked into. It becomes unstable and cannot stand still. (3) A sand layer change of about 1 m is commonplace in places with heavy sediment load, but it cannot be used as a fish reef because it cannot be coped with by this sediment. (4) The depth of water where kelp is the most breeding is 1 m from the sea surface.
It has been confirmed that it is preferable that the depth is up to 5 m, but it is not possible to secure a fish reef at the above-mentioned suitable water depth level at a site with a depth larger than this.

The present invention has been made in view of the above circumstances, and an object thereof is to have a large natural stone surface area and a large degree of unevenness, which can be stably installed on the seabed and may be buried in quicksand. The purpose of the present invention is to provide an artificial fish reef of a shell-type concrete block that can secure the fish reef at a suitable water level even at a deep site.

[0007]

In order to achieve the above-mentioned object, the artificial fish reef of the shell type concrete block of the present invention is installed on the bottom at the time of upside down molding, and three legs simultaneously adjustable in length according to the depth of the site are simultaneously installed. Assuming that a large natural stone is integrally placed on the surface of a molded solid shell-type concrete block with an adhesive such as mortar, the length is adjustable according to the depth of the installation site. Stable installation and convective sand can be expected, and fish reefs can be reliably installed at the optimum level, and by arranging a large natural stone afterwards, it is possible to significantly expand the exposed surface area of natural stone, which is advantageous for kelp curing. It realizes a large unevenness that will be a safe home for young children.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described with reference to the drawings. FIG. 1 shows an artificial fish reef 9 of the shell type concrete block of the present invention. That is, three legs 11, ... Are provided on the bottom surface 10a of the solid shell-type concrete block 10. The shell type concrete block 1
Although 0 is not shown in the figure, it is molded with a concrete formwork fixed in an inverted bowl shape as is common sense, but at this time, the length can be adjusted on the upper surface of the formwork (for example, double slideable). This is done by covering the integral lid part of the three-legged molding tube part of the pipe), so that the shell type concrete block 10 is positioned at a suitable depth according to the depth of the installation site ,. Is set. After concrete molding,
Shell type concrete block 1
0 Large natural stone with adhesive such as mortar on the surface 1
2, ... (Granite, cobblestone, etc.) are integrated.

However, the artificial fish reef 9 of the present invention, in which the shell-type concrete block 10 is located at the optimum depth in advance,
Is reliably and stably installed on the irregular seabed 13 as shown in FIG. 2 by supporting the three legs 11, .... Incidentally, although the tide flows downward due to the stepladder, the shell-type concrete block 10 is not hollow but solid, and therefore does not cause inconvenience such as falling.

Also, as shown in FIG. 3, even if the sand load 14 is used, the 10 parts of the shell-type concrete block, which is the core of the sand load 14,
It is suitable because it is not buried inside.

[0011]

Since the present invention is configured as described above, it has the following effects. (1) Since the three legs are adjusted so that the shell-type concrete block, which is the core of the fish reef, is positioned at the optimum level according to the depth of the site where the fish reef is installed, reliable kelp curing is guaranteed. (2) With three legs, stable installation can be expected even in irregular ponds. (3) The stepladder avoids burial in quicksand. (4) A large natural stone provides a large surface area and a large unevenness, which is excellent in terms of safety for kelp curing and young children.

[Brief description of the drawings]

FIG. 1A is a plan view of an artificial fish reef of the present invention, and b is b in FIG.
It is a vertical cross-sectional view taken along the line -b.

FIG. 2 is an explanatory view of the seabed installation of the artificial fish reef of the present invention.

FIG. 3 is a view showing an embodiment of the artificial fish reef of the present invention in quicksand.

FIG. 4 is an explanatory diagram of an artificial fish reef in which boulders are arranged on the surface of a conventional shell-type concrete block.

FIG. 5 is an explanatory view of an artificial fish reef in which boulders are arranged on the surface of a conventional shell-type concrete block.

[Explanation of symbols]

 1 shell type concrete block 2 through hole 3 base frame 4 shell type concrete block 5 rock rock 6 bolt tightening 7 base frame 8 through hole 9 artificial fish reef 10 shell type concrete block 10a bottom 11 three legs 12 natural stone 13 rough seabed 14 quicksand

Claims (1)

[Claims] 1. A large natural stone is coated with an adhesive such as mortar on the surface of a solid shell-type concrete block that is simultaneously molded with three legs whose length can be adjusted to the depth of the installation site on the bottom surface during upside-down molding. An artificial fish reef with shell-type concrete blocks that are integrated together.