JPS5814165B2 - Assembly type artificial reef - Google Patents

Description

[Detailed description of the invention] The present invention relates to an artificial reef that is submerged in the sea.

Artificial reefs are rarely used individually or singly in the sea, and generally have a size of 100 square meters to 500 square meters.
In practical use, a large number of collective units, 3.3 cm, are used as one unit, and these units are installed in an orderly manner at intervals of 50 m to 100 m.

However, most of the conventional artificial reefs meet the essential requirements for artificial reefs, such as increasing the space of the reef (effective space species) to create shading and escape areas for fish, and to exhibit the octopus attracting effect. Development is being carried out solely on this idea.

Therefore, in fact, we need to consider the sustainability of the reef effect after being submerged in the sea, which is an important element for a fish reef, or the shape of the reef that is necessary to create a long-term sustainability of the reef effect, as well as the sentry effect and reef manufacturing. From the perspective of the total cost involved in completing the submergence, the results were by no means satisfactory.

The purpose of the present invention was to solve the above-mentioned drawbacks of conventional artificial fish reefs. To provide a prefabricated artificial fish reef characterized in that a base trapezoidal plate body having a larger external dimension than the upper layer trapezoidal plate body is disposed at the bottom, and these are connected by respective supports. .

In order to further explain the invention, a description will be given on the basis of an illustrated embodiment.

The assembled artificial reef shown in FIGS. 1 and 2 is composed of various members shown in FIG. 3.

What is indicated by the reference numeral 1 in Fig. 3 is an upper trapezoidal plate for forming the upper part 20 of the fish reef (Figs. 1 and 2), with one side having a wide surface 11 and the other side having a narrow surface. The surface 12 and the peripheral end surface are formed into slopes 13.

This trapezoidal plate body 1 for the upper layer further has a punch hole 1 approximately in the center.
0 is formed.

Further, reference numeral 3 designates a base trapezoidal plate for configuring the base portion of the fish reef, which, like the upper trapezoidal plate 1, has one wide surface 31, the other narrow surface 32, and a periphery. Slope end face 3
3, and a punch hole 40 is formed approximately in the center.

The trapezoidal plate 3 for the base has a larger external dimension than the trapezoidal plate 1 for the upper layer in order to obtain stability.

When carrying out the present invention, the upper trapezoidal plate 1 has its wide surface 11 facing upward, and the trapezoidal pole body 3 for the base has its narrow surface 32 facing upward.
It can be assembled with the side facing upward.

Next, a method for assembling the illustrated prefabricated artificial reef will be explained as follows.

That is, after inserting each support 4 having a hanger attachment hole 8 at the upper part into a plurality of support holes 7 provided in a trapezoidal plate 3 for a base serving as the base of the fish reef, the lower part of the support 4 is inserted. The fixing bolt 5 is passed through the bolt hole 9 provided in the bolt hole 9, and the nut is tightened.

Next, cylindrical spacers 2 molded to predetermined dimensions and trapezoidal plate bodies 1 for upper layer are alternately fitted into each column in such a quantity as to fill the column 4, and each plate body 1, 1, 3 A gap 21 is formed therebetween.

Finally, using the lifting hand 6 necessary for transportation and sinking work as shown by the imaginary line on the upper part of the pillar in FIG. By holding the uppermost trapezoidal plate 1 by sandwiching a washer larger than the size, the holding of the other spacers 2 and other upper trapezoidal plates is completed.

The material of the trapezoidal plate for the upper layer and the trapezoidal plate for the base constituting the prefabricated artificial reef of the present invention may be one or more of concrete, synthetic resin, and metal. ζ Concrete is preferable in terms of self-sustaining stability on the seabed, durability, and cost.

In addition to the shape shown in Fig. 3, the shape may be a hollow triangle or a hollow disc as shown in Fig. 4.
Hollow triangular plates, hollow disc-shaped plates, etc. are also included, since the gist and effects of the present invention are not changed in any way even if the circumferential end surface is significantly chamfered (slanted).

The punched holes in the trapezoidal plate for the upper layer and the trapezoidal plate for the base are provided with an appropriate draft angle to facilitate release from the mold during manufacturing.

The struts must not only connect each member, but also play an important role in retaining all the external forces that are applied to the reef during transportation or sinking operations, and even after the reef has been sunk, so they are required to have sufficient strength and durability. Therefore, the material may be concrete metal, reinforced synthetic resin, etc., but if necessary, reinforced concrete is preferable.

The shape of the support is preferably a cylinder, a square pillar, etc., but it is also possible to use a hollow pillar, etc., which is advantageous for transportation and assembly.

The shape of the spacer should preferably be a tube that matches the cross-sectional shape of the support, and the material should be concrete, metal, synthetic resin, etc., which have excellent durability and strength, and concrete is preferable from the viewpoint of durability and cost.

Further, the length of the spacer can be determined depending on the type of fish, the location where the fish reef is deposited, etc., and can be easily changed at the depositing site.

The features and effects of the present invention are described below.

(1) Each component is simplified and easy to assemble, so there is no need for specialized engineers to manufacture and assemble each component on-site, allowing amateurs to manufacture and assemble components efficiently. Since it can be standardized and is an assembly type that can be assembled on-site, it is easy to transport and store, and can be easily mass-produced.It is also highly competitive in terms of price compared to conventional fish reefs.

(2) Because each member is simplified and has a simple shape, it is possible to fully utilize durable and relatively inexpensive concrete as the material for each member, and the assembled fish reef body is The prefabricated artificial fish reef of the present invention has a space (effective empty volume) that has sufficient shadow areas and escape areas for activities, and therefore exhibits an excellent so-called gathering effect.

(3) In addition to the simplification of each member as described above, special consideration has also been given to the shape of the member. For example, the following structural features are designed to facilitate ease and accuracy of the submersion work. have.

That is, the artificial reef of the present invention has exceptionally large holes 10 and 40 in the center of the reef to alleviate water resistance from below during sinking of the reef, thereby shortening the time required for sinking the reef, and By making the entire circumferential edge slope, it is possible to alleviate the lateral force of the tidal current that acts when the vessel is submerged.

In this way, the fish reef can be deposited accurately at the target location, and the effect is extremely large, especially in depositing work in areas with strong tidal currents.

In addition, there is a large hole 1 in the center of this fish reef.
0. 40 is provided between each of the trapezoidal plates 1 and 1 for the upper layer, in order to facilitate the sinking work and to increase the space (effective empty volume), which is a necessary requirement for fish reefs. By arbitrarily changing the dimensions of the spacer 2 and the pillar 4, the space can be easily increased, and it can also be used to prevent overcrowding due to abnormal growth of seaweed or shellfish in the fish reef, or to adjust the type of fish and fish grounds. Changes can be made easily at the sinking site, such as creating a fish reef body that matches the requirements.

(4) It is important that fish reefs exert their lasting effects, and for this purpose, it is necessary to fully understand the influence of tidal currents when sinking fish reefs.

In particular, the self-sustaining stability of the fish reef against the bottom flow is important, and in view of this point, the present invention makes all the peripheral end faces of the base and upper layer plates that make up the fish reef slope, which acts on each of these plates. While reducing the lateral force of the tidal current and thereby reducing the overturning moment acting on the reef as much as possible, the shape has a relatively large hole in the center, which reduces tidal current resistance due to the bottom current and moderate buoyancy. At the same time, the bottom surface of the bottom of the fish reef, which comes into contact with the sediment on the seabed, is made thicker, and the shape of the bottom is made into a trapezoidal plate, thereby reducing the collision resistance of the bottom flow against the fish reef. As a result, the sand at the boundary (contact area) between the fish reef and the sand, as seen in conventional fish reefs, is subject to the infiltration effect of the colliding vortex, causing the fish reef to topple over or become buried in the sand. This is to prevent accidents such as fish reefs from occurring, permanently maintain the normal state they were in when they were first submerged, and allow the original effects of the fish reef to remain unchanged for many years.

(5) Furthermore, the assembled artificial reef of the present invention has the effect that the circumferential end surfaces of each of its plates are all chamfered (slanted), so that it can easily come off when fish reefs get entangled or tangled.

In addition, the dog-sized hole in the center of the reef blows up the bottom flow from the center of the reef to the upper layer, which activates the generation of plankton in the upper layer of the reef, thereby further enhancing the effect of attracting fish to octopuses. It also has another effect of improving performance.

(6) Compared to the upper layer of the reef, the base is wider and the center of gravity of the reef is lowered, so it is less prone to tipping over and has excellent self-sustaining stability.

As described above, the prefabricated artificial fish reef of the present invention is superior to conventional fish reefs in terms of its permanent effect on attracting fish, workability in manufacturing, transportation, assembly, and sinking, and productivity in commercialization. It is extremely advantageous in terms of economy and economy, and has excellent practical value.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an assembled artificial reef according to an embodiment of the present invention. FIG. 2 shows a sectional view taken along the line AA in FIG. 1. Figure 3 shows the components of the prefabricated artificial reef shown in Figure 1.
FIG. 4 is a perspective view of an assembly member used in another embodiment of the invention. 1... Trapezoidal plate for upper layer, 2... Spacer, 3... Trapezoidal plate for base, 4...
...Strut, 5...Fixing bolt.

Claims (1)

[Claims] 1 A plurality of upper layer trapezoidal plates 1, 1 each having a wide surface 11 on one side, a narrow surface 12 on the other side, a slope 13 on the peripheral end surface, and a punch hole 10 approximately in the center, and the trapezoidal plate for the upper layer. A trapezoidal base plate 3 having a wide surface 31, a narrow surface 32, a slope 33, and a punch hole 40 on the same body as the body 1 and having a larger external dimension than the trapezoidal plate 1 for the upper layer is attached to the upper layer. Each of the trapezoidal plates 1 for use has its wide side 11 facing upward, and the trapezoidal plate 3 for the base has its narrow side 32 facing upward, and each of the upper and base trapezoidal plates 1, 1 has its narrow side 32 facing upward. , 3 are stacked on each other such that a gap 21 is formed by interposing a spacer 2 between them, and the upper layer and each trapezoidal plate body 1 for the base,
1 and 3 are connected by an appropriate number of supports 4.