JPH09163894A - Artificial fish reef filled with shell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial fish reef filled with shells, having high fish gathering effects and propagating effects without fracturing even in a place of remarkably rapid tidal currents and improved in durability by successively laminating scallop shells, and filling the scallop shells in each unit case. SOLUTION: This artificial fish reel comprises an assembly of unit cases 2 filled with shells in a water flow case made of a resin or steel and the unit case 2 is formed of a water flow cylindrical case. Scallop shells 3 are successively laminated and filled in the case 2 or the scallop shells 3 and oyster shells, Japanese pearl oyster shells, etc., of an indeterminate form are alternately filled or mixed in the unit case 2. Furthermore, a reinforcing material made of a resin or steel along the case 2 is preferably provided for the case 2 itself.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell-filled artificial fish reef which has a high fish collecting effect and a high breeding effect and is excellent in durability.

[0002]

2. Description of the Related Art In the early days of artificial reefs, a wall or frame through which fish could pass was simply provided with a fish nest function (for example, Japanese Patent Publication Nos. 50-15717 and 52-158095). No. 59-82030, No. 52-134589, No. 52-158095,
61-43875). However, the fish collecting case or the fish collecting panel used for the artificial reef influences the purpose of the artificial reef, that is, the effect of collecting fish and the reproductive effect. Therefore, the present applicant has filed Japanese Patent Application Laid-Open No. 6-
In No. 141727, we proposed a fish-collecting case in which oyster shells are filled in a water-permeable mesh formed of mesh. This fish collection case
By allowing the filled oyster shells to reproduce feed organisms or microorganisms useful for water purification, fish collecting and reproduction effects are enhanced. This fish collecting case is used alone or as a panel and is attached to an existing or new artificial reef made of concrete or the like.

The fish collecting case described above is not so strong because it uses a rigid net made of plastic or steel or has a number of holes in a plastic pipe to achieve water permeability. On the other hand, for example, when attaching to an artificial fish reef,
Steel wires and bolts were pierced through the fish-collecting case, and these were used as fixtures, and these wires and bolts were connected to the artificial fish reef structure or welded. At this time, stress concentrates on the penetrating parts of the wires and bolts, and the fish case with low strength may be broken.

Further, when the fish-collecting cases are connected to each other by welding the fixtures that penetrate the wires and bolts to form a panel, the fish-collecting cases are exposed near the fixtures, and therefore the fish-collecting cases are exposed during welding work. There was a problem that could damage the case. Therefore, panelizing such a fish collecting case,
Regarding the means for attaching to the artificial fish reef, it is a prior application so as to prevent the fish collecting case from being damaged by the load of the fixture, and to make it easy to mount it on a panel or to an existing or new artificial fish reef. -141727 The fish collection case was reconsidered, and a shell-filled artificial fish reef in which the durability of the case was also considered was completed, and it was proposed in Japanese Patent Application No. 6-29518 (JP-A-7-236685).

The structure is a water-permeable mesh body filled with oyster shells and the like, the end of the mesh body which penetrates the stopper is fitted into a steel channel, and the stopper end is connected to this channel, and The channel around the stopper is filled with cement mortar. In this channel type, a plurality of water-permeable nets are fitted into long steel channels and joined to form a panel.

Further, the water-permeable net body penetrating the stopper is inserted into the open end of the sealed steel pipe, the stopper end is connected to this pipe, and cement mortar is filled into the pipe around the stopper. It may be a fish collection case for artificial reef. In the case of this pipe type, a plurality of pipes can be made into a panel by connecting the steel pipe portions by welding.

In addition, the water-permeable net body penetrating a stopper provided with a bolt is attached to the open end of a synthetic resin pipe closed by a lid surface having an opening at a position corresponding to the bolt. There is also proposed a fish collecting case for an artificial fish reef in which a bolt is inserted so as to project from an opening in the lid surface, the bolt is fixed to the lid surface, and cement mortar is filled into a pipe around the stopper. In this bolt type, a plurality of bolts can be connected to each other by bolt connection to a long steel material to form a panel.

[0008]

[Patent Document 1] Japanese Patent Laid-Open No. 7-23
When the shell-filled artificial fish reef with the structure proposed in No. 6685 is actually used, the place of use, fish species, tidal current, wave, durability, etc. are examined.
It is pointed out that there is a need for improvement, such that things other than the oyster shells used in No. 85 perform better as artificial fish reefs, and there is a risk of damage in places with extremely fast tides and large waves. It's starting to happen. In recent years,
Even if one tries to dispose of a shell after consumption such as a scallop shell, it is difficult to dump into the ocean, and it is necessary to solve the problem.

[0009]

[Means for Solving the Problems] Japanese Patent Laid-Open No. 7-236685
In addition to the artificial fish reef proposed in No. 1, an artificial fish reef composed of an assembly of unit cases in which shells are filled in a resin or steel water-permeable case is used as a water-permeable cylindrical case. A shell-filled artificial fish reef characterized by being constructed by sequentially stacking and filling scallop shells in a case. Incidentally, the scallop shell referred to in the present invention does not refer only to the shell of the scallop, but is a generic term representative of the shells having a characteristic that the one having a certain shape is mainly (a fixed-shaped shell), The shell is most suitable for the purpose of the present invention.

It has also been found that a scallop shell, an oyster shell, an pearl oyster shell, and other irregularly shaped shells which are alternately alternately filled or mixed in the same unit case are also suitable.

In these unit cases, a resin or steel reinforcing member is provided along the unit case itself.

[0012]

1 is a perspective view of a shell-filled artificial fish reef according to the present invention. In this shell-filled artificial fish reef, a large number of unit cases 2 filled with shells are attached to a water-permeable case 1 made of steel to form an aggregate. In this artificial fish reef, the unit case 2 has a synthetic resin net with an eye size of 25 × 30 mm.
A water-permeable tubular case with a tubular shape of 150 mmφ, with the scallop shell 3 in the uppermost unit case 2 as shown in FIG.
(Monaka) were combined and sequentially laminated and filled.

As shown in FIG. 3, scallop shells 3 and oyster shells 4 (which may be irregularly shaped shells such as pearl oyster shells) are alternately and alternately filled in the unit case 2 of the second upper stage. The unit cases 2 on the four sides are alternately attached with only the oyster shells 4 and the scallop shells 3 separately filled. All the unit cases may be filled with the scallop shell 3.

As shown in FIG. 4, these unit cases 2 are provided with four reinforcing members 5 of steel rods having a diameter of 16 mm so as to surround them. This reinforcement may be provided in the unit case. This enhances the mechanical strength against the tidal current in the unit case, and it is almost 30% against corrosion.
The service life of the year can be secured.

The example shown in FIG. 5 is an example in which the unit case 2 is a cylindrical body having a rectangular cross section. In this example, the scallop shell 3 is mainly used, and other shells may be mixed and filled.
Small shells may be packed around the.

The shell-filled artificial fish reef of the present invention is not limited to the shape shown in FIG. 1, and the arrangement of the unit cases can be changed as appropriate, or the shape can be changed from square to triangular or cylindrical.

[0017]

Industrial Applicability According to the present invention, it is possible to provide a shell-filled artificial fish reef that can exhibit the function as an artificial fish reef better than before and is not damaged even in a place where the tidal current is extremely fast. It is also significant that scallops, which are extremely difficult to dispose of, can be effectively used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shell-filled artificial fish reef of the present invention.

FIG. 2 is a partially cutaway side view of a unit case filled with scallop shells.

FIG. 3 is a partially cutaway side view of a unit case in which scallop shells and oyster shells are alternately and alternately filled.

FIG. 4 is a perspective view of a unit case.

FIG. 5 is a partially cutaway side view of a square tubular unit case filled with scallop shells.

[Explanation of symbols]

 1 Water-permeable case 2 Unit case 3 Scallop shell 4 Oyster shell 5 Reinforcement material

Claims (3)

[Claims] 1. An artificial fish reef consisting of an aggregate of unit cases in which shells are filled in a resin or steel water-permeable case, wherein the unit cases are made into a water-permeable cylindrical case, and scallop shells are sequentially laminated in the case. A shell-filled artificial fish reef, which is characterized in that it is configured by filling. 2. An artificial fish reef consisting of an assembly of unit cases in which shells are filled in a resin or steel water-permeable case, and scallop shells, oyster shells, pearl oyster shells, and other irregularly shaped shells are sequentially placed in the unit cases. A shell-filled artificial fish reef characterized by being composed of alternating filling or mixing. 3. A shell-filled artificial fish reef characterized in that the unit case according to claim 1 or 2 is provided with a reinforcing material made of resin or steel along the case.