Marine forest structure

Abstract

The present invention is to provide a marine forest structure by which many kinds of fishes and shellfishes can gather and inhabit and to which useful seaweeds such as of Laminariaceae and the like can adhere to propagate when the structure is submerged and disposed on the bottom of the sea. Provided is a marine forest structure 1 which is composed of a base 2 in which legs 5 are protruded from a peripheral edge of a flat plate 4 in which plural holes 6 are provided in a central part and a peripheral part thereof and two kinds of pillar bodies 3a, 3b whose lengths are different. The marine forest structure is constructed such that a plurality of pillar bodies 3a which has a predetermined height are raised from and fixed to the holes 6 of the flat plate 4 and that pillar bodies 3b which has a height lower than that of the pillar bodies 3a with the predetermined height are raised from and fixed to the plural holes 6 of the periphery of the flat plate 4.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a marine forest structure which makes seaweeds grow thickly, in which fishes and shellfishes can settle and propagate, and which is to improve an environment in the sea, and more particularly to a technique of a marine forest structure for which scrap wood can be effectively utilized, which can be installed in a stable state in the sea without being influenced by waves, and which can be assembled easily near the sea where the structure is installed. [0003] 2. Description of the Related Art [0004] Conventionally, as techniques developed for this type of purpose, for example, well known are Japanese Patent No. 2824232, Japanese Patent No. 2905432, Japanese Patent Application Laid-Open (JP-A) No. 9-65795, JP-A No. 2000-69878, JP-A No. 7-317042, and the like. [0005] The technique of Japanese Patent No. 2824232 described above is of a preparation method of a marine forest which is constru...

AI Technical Summary

Benefits of technology

[0017] The marine forest structure of the invention is to provide a technique of a structure which can be constructed in a simple structure in which pillar bodies are raised only, and in which pillar bodies having different, heights are arranged in a predetermined order so that physical-chemical, biological continuity of an inhabiting place / space and an external space is ensured by a moderate shifting zone of a bright part and a shadow part formed by the pillar bodies, so that the volume of the inhabiting place / space of fishes and the like can be made large.

[0035] In the fourth invention of the invention, as described above, since the pillar bodies raised from the base are constituted by scrap wood of telegraph poles, or thinning wood of mountains and forests, scrap wood can be effectively utilized, and a large amount of structures can be produced at extremely low cost. Particularly, scrap wood of telegraph poles are suitable for growing of seaweeds, and seaweeds can be allowed to grow thickly only by making the structure submerge into and disposed in the sea for a predetermined period of time if natural seaweeds are growing thickly in the vicinity thereof. Thinning wood can be utilized as an inhabiting place of a small animals such as Gammarid and the like which become feed for fishes, and swarming effect of fishes can be expected.

Problems solved by technology

In the techniques of Japanese Patent Nos. 2824232 and 2905432, since the carrying bases to which seaweed species fungi are allowed to adhere in advance have to be attached and fixed to the pillar bodies and to the stick-like bodies, respectively, in a branching manner, problems arise in that the workability is extremely poor and that the cost becomes high.

Further, in the technique of JP-A No. 2000-69878, since seaweed species fungi have to be planted on the pillar body standing at the central portion of the concrete base formed into the cross-shape by a predetermined means, similarly to Japanese Patent Nos. 2824232 and 2905432, problems arise in that the work is complicated and that the cost becomes high.

The technique of JP-A No. 2000-69878 has problems that the plurality of special pillar bodies independently standing by buoyancy have to be employed, that the lower ends of these pillar bodies have to be swingably attached and fixed to the base made of stone, employing the extremely complicated coupling means, that the structure thereof is complex, and that the work is troublesome in the case where this structure is realized.

The technique of JP-A No. 7-317042 has problems that the plural pillar bodies, after being coupled mutually through horizontal cross pieces to construct a unit, have to be extended upwardly from the apertures in the concrete heavy base so that the work is complex, although there is a merit that a large number of pillar bodies can be allowed to stand together.

Further, there is one more problem that as the base which supports a large number of units, an extremely heavy concrete base has to be employed.

Accordingly, there is a problem that a base which has a weight heavier than necessary has to be employed and that this base, the pillar bodies upstanding therefrom, and the like have to be securely coupled together.

Further, in the case of a marine forest in which the pillar or stick-like bodies having approximately the same height are raised from the base, there is a problem that shadow portions formed in the sea by these pillar bodies and the like are uniform and lack variety.

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