JP2004344021A - Hybrid fish reef - Google Patents

Hybrid fish reef Download PDF

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Publication number
JP2004344021A
JP2004344021A JP2003142364A JP2003142364A JP2004344021A JP 2004344021 A JP2004344021 A JP 2004344021A JP 2003142364 A JP2003142364 A JP 2003142364A JP 2003142364 A JP2003142364 A JP 2003142364A JP 2004344021 A JP2004344021 A JP 2004344021A
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Japan
Prior art keywords
hybrid
wood
thinned
reef
fish reef
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JP2003142364A
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Japanese (ja)
Inventor
Hideaki Kawamura
秀明 川村
Naoki Mae
尚樹 前
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Daio Kensetsu KK
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Daio Kensetsu KK
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Priority to JP2003142364A priority Critical patent/JP2004344021A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

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  • Artificial Fish Reefs (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid fish reef which can supply feeds from decayed thinnings to insects such as shipworms, can supply nutrients to sea water to promote the growth of fishes and shellfishes, can enhance an effect for gathering the fishes and the shellfishes, and enables the supply or exchange of the thinnings. <P>SOLUTION: This hybrid artificial fish reef 10 for setting to sea bottom is characterized by combining concrete / steel / thinnings and receiving the thinnings in the fish reef in a state capable of being replenished or replaced. Concretely, the hybrid fish reef is characterized by forming a hollow box-like steel skeleton on a concrete base 11, detachably disposing several stages of timber-receiving boxes 14a, 14b, 14c, 14d in the steel skeleton, and receiving the thinnings in each timber receiving box in a laid state parallel to each other. The hybrid fish reef is characterized by further vertically disposing several thinnings 15 at a site for concealing each pillar 12 constituting the steel skeleton. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明はコンクリート・鋼材・間伐材からなる人工の魚礁であって、腐蝕した間伐材が舟食虫等の虫の餌となり、或いは栄養分を海中に供給することにより魚介類の生育を促進するとともに魚介類の蝟集効果を高め、特に徐々に腐蝕していく間伐材を一定期間毎に補充もしくは取替交換可能としたハイブリッド魚礁に関するものである。
【0002】
【従来の技術】
従来から海洋での魚を蝟集させる目的で人工の魚礁を作製して海底に設置する手段が知られている。魚礁の主材としてコンクリートブロックとか鋼製部材が多く用いられており、これらの魚礁は海藻類が育成可能な多孔質のコンクリート材の内方に魚介類が容易に進入可能な通路及び部屋が上下多数段に形成され、魚介類の隠れ場所としても適当な内部構造となっている。上記コンクリート材に代えて自然石を加工したり、廃船となった漁船もしくはタンカーを沈めて人工魚礁とした例もある。
【0003】
図9は従来のコンクリート魚礁の一例を示すものであって、中空立方骨組状のブロック本体1の各頂点部2,2から内方に向けて骨部材3,3を延長し、中心部4で結合したブロック魚礁を構成している。海水中には海藻類が摂取可能な微量元素として、チッソ,リン,ケイ素,亜鉛,銅,コバルト,マンガンが多く含まれており、コンクリート魚礁に海藻類を効率的に育成させるための手段として、海藻類の苗をコンクリート材の表面に植え付ける方法とか、コンクリート材に自然岩石とか貝殻を混入したり貼り付ける方法があり、更にコンクリート材からのアクの放散を防止するために該コンクリート材の表面に合成樹脂剤を塗着したり、コンクリート材を有機物溶液の中に所定の期間浸漬して溶解成分を除去してから海底に浸漬する方法が採られている。
【0004】
上記のハイブリッド魚礁に関し、本出願人は先にコンクリート・鋼材・間伐材の組合せでなるハイブリッド構造としたハイブリッド魚礁、特にコンクリートの底盤上に中空ボックス状の鋼製骨組を構成し、該鋼製骨組の内部に、鋼材により上段,中段,下段の棚部を形成して、各棚部上に間伐材を横置状として並置固定し、鋼製骨組を構成する柱材を隠蔽する部位に、複数本の間伐材をL字状に立設したハイブリッド魚礁を提案した(特許文献1参照)。
【0005】
かかるハイブリッド魚礁によれば、海底に設置した際に底盤により安定性が確保されるとともに中空ボックス状の鋼製骨組によって形状が安定化して魚介類の住みかが形成され、鋼材によって形成された上段,中段,下段の各棚部上に並置された間伐材及び柱材の外側にL字状に立設された間伐材が長期に亘って徐々に腐蝕しながらチッソ,リン等の栄養分を海中に供給することによってプランクトンが大量に発生し、プランクトンを食べるために小型の魚介類が蝟集し、この小型の魚介類を食べる大型の魚介類も蝟集する。従って単に魚介類の生育場所と隠れ家を形成するだけでなく、間伐材の腐蝕に伴って長期に亘って海中に栄養分を供給することが可能なハイブリッド魚礁が得られる。
【0006】
【特許文献1】
実用新案登録第3092961号
【0007】
【発明が解決しようとする課題】
近年大型海藻が消失して海中の栄養分が不足していることが指摘されており、特に沿岸域の漁獲生産力が低下する「磯焼け」が大きな問題となっている。この「磯焼け」は海中の栄養分不足が主な原因であり、これに対処して設置されている前記コンクリートブロックや鋼製でなる人工の魚礁は、魚を蝟集させる目的,即ち魚の生育場所と隠れ家を形成する機能が主であって、海中に栄養分を供給する機能は有していない。
【0008】
一方、我が国の山は近年の木材価格の低迷等により林業従事者の減少と高齢化が進み、人工林の間伐などの維持管理が行われていない放置林の面積が増大しつつあり、全国的に森林の公益的機能が低下する傾向にある。その対策として森林の適正な維持管理を継続するために間伐材を有効利用することによって林業従事者の収益を高めることが肝要な事項となっている。最近では山から河川を通じて海へ栄養分を供給するという森林の機能が注目されており、山と海は豊かな沿岸域を形成する上で密接な関係があるため漁業従事者が山に木を植えるということもよく聞かれる。
【0009】
前記した特許文献1によれば、中空ボックス状の鋼製骨組によって形状が安定化して魚介類の住みかが形成されるとともに、上段,中段,下段の各棚部上に並置された間伐材及び柱材の外側にL字状に立設された間伐材が徐々に腐蝕することによって栄養分を海中に供給することができるが、腐蝕した間伐材を定期的に取替交換可能にはなっていないという問題が残っている。
【0010】
そこで本発明は、コンクリート・鋼材・間伐材のハイブリッド構造としたことにより、徐々に腐蝕していく間伐材を長期間海中に設置することを可能とし、腐蝕した間伐材を舟食虫等の虫の餌とするとともに、腐食した間伐材から栄養分を海中に供給することにより、魚介類の蝟集効果を高めるとともに、間伐材を一定期間毎に補充もしくは取替交換可能としたハイブリッド魚礁を提供することを目的としている。
【0011】
【課題を解決するための手段】
本発明は上記目的を達成するために、海底に設置する人工の魚礁であって、コンクリート・鋼材・間伐材の組合せでなるとともに、魚礁内に間伐材を補充もしくは取替交換可能に収納したハイブリッド魚礁を基本構造としている。
【0012】
具体的には、コンクリートの底盤上に中空ボックス状の鋼製骨組を構成し、該鋼製骨組の内部に複数段の木材収納ボックスを着脱自在に配置して、各木材収納ボックス内に間伐材を横置状として並置収納してある。更に鋼製骨組を構成する柱材を隠蔽する部位に、複数本の間伐材を補充もしくは取替交換可能に立設したハイブリッド魚礁を提供する。
【0013】
かかるハイブリッド魚礁によれば、海底に設置した際に底盤により安定性が確保されるとともに中空ボックス状の鋼製骨組によって形状が安定化して魚介類の住みかが形成され、着脱自在に配置された木材収納ボックス内に並置収納された間伐材及び柱材の外側に立設された間伐材が長期に亘って徐々に腐蝕しながら、舟食虫等の虫の餌となり、又チッソ,リン等の栄養分を海中に供給することによってプランクトンが大量に発生し、プランクトン及び虫を食べるために小型の魚介類が蝟集し、この小型の魚介類を食べる大型の魚介類も蝟集する。従って単に魚介類の生育場所と隠れ家を形成するだけでなく、間伐材を補充もしくは取替交換可能としたことによって、該間伐材の腐蝕に伴って長期に亘って海中に舟食虫等の虫の餌と栄養分を供給することができる。
【0014】
【発明の実施の形態】
以下図面に基づいて本発明にかかるハイブリッド魚礁の実施形態を説明する。図1は本発明にかかるハイブリッド魚礁10を全体的に示す斜視図、図2は同正面図であり、図中の11はコンクリート製の底盤であって、この底盤11は平面視が基本的に正方形に構成され、中心部には略正方形の孔部11aが貫通して形成されている。底盤11は海底でのハイブリッド魚礁10の安定性を確保する機能を有している。尚、底盤11の平面視は必ずしも正方形でなくてもよく、他の直方形状とか多角形もしくは円形であってもよい。
【0015】
12,12は底盤11上の前記孔部11aの角部近傍に立設された鋼製の柱材であり、この4本の柱材12,12は断面がH型のチャンネル材で構成されており、柱材12,12の下端部は底盤11内に嵌入した状態として固定され、上端部は4本の横桁材13,13によって連結されている。従って4本の柱材12,12と4本の横桁材13,13によって中空ボックス状の鋼製骨組が構成される。この鋼製骨組はハイブリッド魚礁10としての形状を安定化するとともに魚介類の住みかを形成し、後述する木材収納ボックスを着脱自在に配置する機能をも有している。
【0016】
上記中空ボックス状の鋼製骨組の内部には、上方から下方に向けて第一段目の木材収納ボックス14a,第二段目の木材収納ボックス14b,第三段目の木材収納ボックス14c,第四段目の木材収納ボックス14dが配置されており、各木材収納ボックス14a,14b,14c,14d内に多数本の間伐材15,15が横置状として並置収納されている。図示例では第一段目の木材収納ボックス14a及び第三段目の木材収納ボックス14cの間伐材15,15の並置方向に対して、第二段目の木材収納ボックス14b及び第四段目の木材収納ボックス14dの間伐材15,15の並置方向が90度異なっている。間伐材15,15は格別の加工を施すことなく、丸太のまま使用する。
【0017】
上記の実施例では、各木材収納ボックス14a,14b,14c,14dが4段構成となっているが、これに限定されることなく、鋼製骨組の内部に複数段の木材収納ボックスを配置することができる。
【0018】
図3は第一段目の木材収納ボックス14aを構成するボックス本体16を示す斜視図であり、このボックス本体16は4枚のL型鋼17,17を略正方形に組み付けて溶着固定して構成され、該L型鋼17の対向する部位に2枚の鋼板18,18が立設固着されている。この鋼板18,18の両端には曲折部18a,18aが形成されていて、この曲折部18a,18aの上端フランジ部にボルト穴19,19が開口されている。
【0019】
図4はボックス本体16上に固定する上蓋20を示す斜視図であり、ボックス本体16と同様に4枚のL型鋼21,21を略正方形に組み付けて溶着固定してあり、該L型鋼21の対向する部位に計4枚の取付ブラケット22,22が固着されている。この取付ブラケット22,22にはボルト穴23,23が開口されている。更に上蓋20の角部下面に鋼板24,24が固着されていて、この鋼板24,24にもボルト穴25,25が開口されている。
【0020】
図5は上記ボックス本体16に上蓋20を組み付けて固定した木材収納ボックス14aを示す斜視図であり、ボックス本体16の曲折部18a,18aの上端に開口したボルト穴19,19と、上蓋20の角部下面に固着された鋼板24,24に開口されたボルト穴25,25を用いてボックス本体16と上蓋20をボルト締結する。更にL型鋼21の対向する部位に固着された取付ブラケット22,22の下に支持フレーム26,26を配置して、ボルト穴23,23を用いて木材収納ボックス14aと支持フレーム26,26をボルト締結してある。
【0021】
図6は断面H型のチャンネル材で構成された柱材12,12に、木材収納ボックス14aの支持フレーム26の端部を挿入して溶着した状態を示す要部斜視図である。なお、上記の実施例では第一段目の木材収納ボックス14aの取付構造に関して説明しているが、第二段目の木材収納ボックス14b,第三段目の木材収納ボックス14c及び第四段目の木材収納ボックス14dに関してもほぼ同様な取付構造となっている。
【0022】
更に図1に示したように、底盤11上に立設された4本の柱材12,12の外側で該柱材12,12を隠蔽する部位に、複数本の間伐材15,15が平面視L字状に立設されている。図7の要部断面図に示したように底盤11に有底の筒状体28,28の下部が埋設固定されており、該筒状体28,28内に間伐材15,15の下端部を嵌入してから各々ボルト29,29を用いて間伐材15,15が締付固定されている。
【0023】
上記構成により、本発明にかかるハイブリッド魚礁10は、コンクリート・鋼材・間伐材でなるハイブリッド構造とし、鋼製骨組内に着脱自在に配置された第一段目の木材収納ボックス14a,第二段目の木材収納ボックス14b,第三段目の木材収納ボックス14c,第四段目の木材収納ボックス14d内に多数本の間伐材15,15を補充もしくは取替交換可能に並置収納するとともに、柱材12,12を隠蔽する部位にも間伐材15,15をL字状に立設したことが特徴となっている。
【0024】
かかるハイブリッド魚礁によれば、海底に本発明にかかるハイブリッド魚礁10を設置した際に、底盤11により安定性が確保されるとともに4本の柱材12,12と4本の横桁材13,13によって構成された中空ボックス状の鋼製骨組によってハイブリッド魚礁としての形状が安定化して魚介類の住みかが形成される。
【0025】
そして鋼製骨組内に配置された木材収納ボックス14a,14b,14c,14d内に収納された多数本の間伐材15,15と、4本の柱材12,12の外側にL字状に立設された間伐材15,15が長期に亘って徐々に腐蝕しながらチッソ,リン等の栄養分を海中に供給する。この腐食した間伐材15,15が舟食虫等の虫の餌となり、又腐食した間伐材15,15によってもたらされる栄養分によってプランクトンが大量に発生し、プランクトン及び虫を食べるために小型の魚介類が蝟集し、この小型の魚介類を食べる大型の魚介類も蝟集する。
【0026】
図8は間伐材15,15を補充もしくは取替交換する際の操作方法を示しており、作業船30上に配備したクレーン31の先端部からワイヤ32を吊り下げ、海底で潜水士33が玉掛けを行ってハイブリッド魚礁10を作業船30の甲板上に吊り上げ、作業員34の手作業によって各木材収納ボックス14a,14b,14c,14d内の間伐材15,15と柱材12,12の外側に立設された間伐材15,15の補充もしくは取替交換作業を行う。作業時には前記図5に示したように支持フレーム26,26と取付ブラケット22,22とを締結しているボルトを外すことにより、各木材収納ボックス14a,14b,14c,14dを支持フレーム26,26から簡単に取り外すことができるので、間伐材15,15の取替交換作業は容易となる。
【0027】
上記により説明したように、本発明にかかるハイブリッド魚礁10は従来の人工の魚礁のように単に魚介類を蝟集させる目的,即ち魚の生育場所と隠れ家を形成するだけでなく、間伐材15,15の腐蝕に伴って長期に亘って海中に舟食虫等の虫の餌を供給し、又栄養分を供給する機能を有しており、かつ、定期的に間伐材15,15を補充もしくは取替交換できることが大きな特長となっている。
【0028】
【発明の効果】
以上詳細に説明したように、本発明によればコンクリート・鋼材・間伐材のハイブリッド構造としたことによって間伐材が長期に亘って徐々に腐蝕しながら、舟食虫等の虫の餌となり、又チッソ,リン等の栄養分を海中に供給することによってプランクトンが大量に発生し、プランクトン及び虫を食べるための小型の魚介類と、この小型の魚介類を食べる大型の魚介類の蝟集効果を高めることができる。特に定期的に間伐材を補充もしくは取替交換することができるので、この間伐材の腐蝕に伴って長期に亘って海中に舟食虫等の虫の餌と栄養分を供給することが可能となる。
【0029】
更に従来から利用価値が比較的少ない間伐材の有効利用をはかることができるので、間伐などの維持管理が行われていない放置林をなくすとともに森林の適正な維持管理を継続するための林業従事者の生活を改善し、森林の公益的機能を高めることができる。
【0030】
従って本発明によれば、コンクリート・鋼材・間伐材のハイブリッド構造とするとともに間伐材を補充もしくは取替交換することができるため、間伐材を長期間に亘って海中に設置することを可能とし、腐蝕した間伐材から舟食虫等の虫の餌と栄養分を海中に供給することにより、単に魚介類の生育場所と隠れ家を形成するだけでなく魚介類の生育を促進し、魚介類の蝟集効果を高めるとともに間伐材の利用価値を高めたハイブリッド魚礁を提供することができる。
【図面の簡単な説明】
【図1】本発明にかかるハイブリッド魚礁を全体的に示す斜視図。
【図2】図1の正面図。
【図3】木材収納ボックスを構成するボックス本体を示す斜視図。
【図4】木材収納ボックスを構成する上蓋を示す斜視図。
【図5】木材収納ボックスを示す斜視図。
【図6】木材収納ボックスの取付構造を示す要部斜視図。
【図7】間伐材の取付構造を示す要部断面図。
【図8】間伐材を取替交換する際の操作方法を示す概要図。
【図9】従来のコンクリート魚礁の一例を示す斜視図。
【符号の説明】
10…ハイブリッド魚礁
11…底盤
11a…孔部
12…柱材
13…横桁材
14a,14b,14c,14d…木材収納ボックス
15…間伐材
16…ボックス本体
17,21…L型鋼
18,24…鋼板
20…上蓋
26…支持フレーム
28…筒状体
30…作業船
31…クレーン
32…ワイヤ
整理番号 P3637
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is an artificial fish reef made of concrete, steel, and thinned wood, wherein the corroded thinned wood becomes a bait for insects such as zoocarnivores, or promotes the growth of fish and shellfish by supplying nutrients to the sea. The present invention relates to a hybrid reef that enhances the aggregation effect of fish and shellfish, and in particular, makes it possible to replenish or replace thinned wood that gradually corrodes at regular intervals.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a means for producing an artificial reef for the purpose of gathering fish in the ocean and installing it on the sea floor. Concrete blocks and steel members are often used as the main material of fish reefs, and these fish reefs have vertical passages and rooms that allow seafood to easily enter the inside of porous concrete material that can grow seaweed. It is formed in many steps and has an internal structure suitable as a hiding place for fish and shellfish. In some cases, natural stones are processed instead of the concrete material, or fishing boats or tankers that have been scrapped are sunk into artificial reefs.
[0003]
FIG. 9 shows an example of a conventional concrete fish reef. Bone members 3, 3 are extended inwardly from respective apexes 2, 2 of a hollow cubic frame-shaped block main body 1, and a central portion 4 is formed. Construct a combined block fish reef. Seawater contains a lot of nitrogen, phosphorus, silicon, zinc, copper, cobalt, and manganese as trace elements that can be consumed by seaweed. As a means to efficiently grow seaweed on concrete reefs, There are a method of planting seaweed seedlings on the surface of concrete material, a method of mixing or attaching natural rocks or shells to concrete material, and a method of preventing seaweed from diffusing from the concrete material. A method has been adopted in which a synthetic resin agent is applied, or a concrete material is immersed in an organic substance solution for a predetermined period to remove dissolved components, and then immersed in the sea floor.
[0004]
Regarding the above-mentioned hybrid fish reef, the present applicant has previously constructed a hybrid fish reef having a hybrid structure composed of a combination of concrete, steel and thinned wood, in particular, a hollow box-shaped steel frame on a concrete base, and said steel frame. Inside, the upper, middle and lower shelves are formed of steel, and thinned materials are juxtaposed and fixed side by side on each of the shelves. A hybrid fish reef in which the thinned timber is erected in an L shape has been proposed (see Patent Document 1).
[0005]
According to such a hybrid reef, when installed on the seabed, stability is ensured by the bottom plate, and the shape is stabilized by the hollow box-shaped steel frame to form a seafood habitat. The thinned lumber juxtaposed on each of the middle and lower shelves, and the thinned lumber erected in an L-shape on the outside of the pillars, gradually corrode over a long period of time, and thereby feed nutrients such as nitrogen and phosphorus into the sea. When supplied, plankton is generated in large quantities, small seafood gathers to eat plankton, and large seafood eating these small seafood also gathers. Therefore, it is possible to obtain a hybrid reef that can not only form a habitat and a hiding place for fish and shellfish but also supply nutrients to the sea for a long period of time due to the corrosion of thinned wood.
[0006]
[Patent Document 1]
Utility Model Registration No. 3092961 [0007]
[Problems to be solved by the invention]
In recent years, it has been pointed out that large seaweeds have disappeared and there is a shortage of nutrients in the sea. In particular, "iso-yake", which reduces the fishing productivity in coastal areas, has become a major problem. The main cause of this "iso-yaki" is a lack of nutrients in the sea, and the concrete blocks and steel-made artificial reefs that are installed in response to this are intended to gather fish, namely The main function is to form a hideout, and it does not have a function to supply nutrients to the sea.
[0008]
On the other hand, in the mountains of Japan, the number of forestry workers has decreased and the population has been aging due to the slump in timber prices in recent years, etc., and the area of abandoned forests where maintenance and management such as thinning of artificial forests is not being performed is increasing. The public interest function of forests tends to decline. As a countermeasure, it is important to increase the profits of forestry workers by effectively using thinned timber in order to maintain proper maintenance of forests. Recently, attention has been paid to the function of forests to supply nutrients from the mountains to the sea through rivers, and fishermen plant trees on the mountains because the mountains and the sea are closely related in forming rich coastal areas. It is often asked.
[0009]
According to Patent Literature 1 described above, the shape of the hollow box-shaped steel frame is stabilized to form a habitat for fish and shellfish, and the thinned lumber is juxtaposed on each of the upper, middle, and lower shelves. Nutrients can be supplied into the sea by gradually corroding the thinned timber that is installed in an L-shape on the outside of the pillar, but the corroded thinned timber cannot be replaced and replaced regularly. The problem remains.
[0010]
Therefore, the present invention, by adopting a hybrid structure of concrete, steel, and thinned wood, makes it possible to install thinned wood that is gradually corroded in the sea for a long period of time. To provide hybrid fish reefs that feed fish and feed nutrients from corroded thinned wood into the sea, thereby enhancing the effect of fish and shellfish gathering and making it possible to replenish or replace thinned wood at regular intervals. It is an object.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an artificial reef installed on the seabed, which is a hybrid of concrete, steel, and thinned wood, and in which the thinned wood is refilled or exchangeably stored in the reef. The basic structure is a fish reef.
[0012]
Specifically, a hollow box-shaped steel frame is formed on a concrete bottom, and a plurality of steps of wood storage boxes are detachably arranged inside the steel frame, and thinning materials are provided in each of the wood storage boxes. Are placed side-by-side and stored side by side. Furthermore, a hybrid fish reef is provided, in which a plurality of thinned woods can be replenished or replaced so as to be erected at a position where a pillar material constituting a steel frame is concealed.
[0013]
According to such a hybrid reef, when installed on the seabed, stability is ensured by the bottom plate, and the shape is stabilized by the hollow box-shaped steel frame to form a habitat for fish and shellfish, which are detachably arranged. The thinned lumber stored side by side in the wood storage box and the thinned lumber standing outside of the pillars gradually erode over a long period of time, and become bait for insects such as carnivorous insects. By supplying nutrients into the sea, plankton is generated in large quantities, small fishes gather to eat plankton and insects, and large fishes eating these small fishes also gather. Therefore, not only forming a hideout with a place where fish and shellfish grow, but also making it possible to replenish or replace the thinned wood, the insects such as zoocarnivorous insects enter the sea for a long time due to the corrosion of the thinned wood. Can supply food and nutrients.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a hybrid reef according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a hybrid fish reef 10 according to the present invention as a whole, and FIG. 2 is a front view of the same. Numeral 11 in the figure denotes a concrete bottom plate. It is formed in a square shape, and a substantially square hole 11a is formed through the center portion. The bottom 11 has a function of ensuring the stability of the hybrid reef 10 on the sea floor. The bottom plate 11 is not necessarily square in plan view, but may be another rectangular shape, a polygon, or a circle.
[0015]
Numerals 12 and 12 denote steel pillars erected near the corners of the hole 11a on the bottom plate 11, and the four pillars 12 and 12 are formed of H-shaped channel members in cross section. The lower ends of the pillars 12 are fixed in a state of being fitted into the bottom plate 11, and the upper ends are connected by four cross beams 13. Therefore, a hollow box-shaped steel frame is constituted by the four pillars 12 and 12 and the four cross beams 13 and 13. The steel frame has a function of stabilizing the shape of the hybrid reef 10 and forming a habitat for fish and shellfish, and a detachable wood storage box described later.
[0016]
Inside the hollow box-shaped steel frame, the first-stage wood storage box 14a, the second-stage wood storage box 14b, the third-stage wood storage box 14c, A fourth-tiered wood storage box 14d is arranged, and a large number of thinned materials 15, 15 are juxtaposed and stored side by side in each of the wood storage boxes 14a, 14b, 14c, 14d. In the illustrated example, the second-stage timber storage box 14b and the fourth-stage timber storage box 14b correspond to the direction in which the thinned materials 15 and 15 are juxtaposed. The juxtaposition directions of the thinning materials 15, 15 in the wood storage box 14d are different by 90 degrees. Thinning materials 15, 15 are used as logs without any special processing.
[0017]
In the above-described embodiment, each of the wood storage boxes 14a, 14b, 14c, and 14d has a four-stage configuration. However, the present invention is not limited to this, and a plurality of wood storage boxes are arranged inside a steel frame. be able to.
[0018]
FIG. 3 is a perspective view showing a box main body 16 constituting the first-stage wood storage box 14a. This box main body 16 is constructed by assembling and fixing four L-shaped steels 17, 17 into a substantially square shape. Two steel plates 18, 18 are erected and fixed to opposing portions of the L-shaped steel 17. Bent portions 18a are formed at both ends of the steel plates 18, and bolt holes 19 are opened in upper end flange portions of the bent portions 18a.
[0019]
FIG. 4 is a perspective view showing the upper lid 20 fixed on the box main body 16, like the box main body 16, four L-shaped steels 21 and 21 are assembled in a substantially square shape and fixed by welding. A total of four mounting brackets 22 are fixed to opposing portions. Bolt holes 23 are opened in the mounting brackets 22. Further, steel plates 24, 24 are fixed to the lower surfaces of the corners of the upper lid 20, and bolt holes 25, 25 are also opened in the steel plates 24, 24.
[0020]
FIG. 5 is a perspective view showing the wood storage box 14a in which the upper lid 20 is assembled and fixed to the box main body 16, and bolt holes 19, 19 opened at the upper ends of the bent portions 18a, 18a of the box main body 16; The box body 16 and the upper lid 20 are bolted together with bolt holes 25, 25 opened in the steel plates 24, 24 fixed to the lower surfaces of the corners. Further, support frames 26, 26 are arranged under mounting brackets 22, 22 fixed to opposing portions of the L-shaped steel 21, and the wood storage box 14a and the support frames 26, 26 are bolted using the bolt holes 23, 23. Has been concluded.
[0021]
FIG. 6 is a perspective view of a main part showing a state in which the end of the support frame 26 of the wood storage box 14a is inserted into and welded to the pillars 12, 12 formed of H-shaped channel members. In the above embodiment, the mounting structure of the first-stage wood storage box 14a is described. However, the second-stage wood storage box 14b, the third-stage wood storage box 14c, and the fourth-stage wood storage box 14a. The wood storage box 14d has substantially the same mounting structure.
[0022]
Further, as shown in FIG. 1, a plurality of thinning materials 15, 15 are planarly disposed outside the four pillars 12, 12 erected on the bottom plate 11, at a portion where the pillars 12, 12 are hidden. It is erected in an L-shape. As shown in the main part sectional view of FIG. 7, the lower portions of the bottomed tubular bodies 28, 28 are embedded and fixed to the bottom plate 11, and the lower end portions of the thinning materials 15, 15 are fixed in the tubular bodies 28, 28. After thinning, thinning materials 15 are fastened and fixed using bolts 29 respectively.
[0023]
With the above configuration, the hybrid fish reef 10 according to the present invention has a hybrid structure made of concrete, steel, and thinned wood, and has a first-stage wood storage box 14a and a second-stage wood storage box removably disposed in a steel frame. A large number of thinning materials 15, 15 are juxtaposed so as to be refillable or replaceable in a wood storage box 14b, a third wood storage box 14c, and a fourth wood storage box 14d. It is characterized in that thinning materials 15, 15 are erected in an L-shape also at the parts concealing 12, 12.
[0024]
According to such a hybrid reef, when the hybrid reef 10 according to the present invention is installed on the seabed, stability is ensured by the bottom 11 and the four pillars 12 and 12 and the four cross beams 13 and 13 are provided. The shape of the hybrid fish reef is stabilized by the hollow box-shaped steel frame constituted by, and a habitat for fish and shellfish is formed.
[0025]
Then, a plurality of thinned materials 15 and 15 stored in the wood storage boxes 14a, 14b, 14c and 14d arranged in the steel frame, and an L-shape standing outside the four pillars 12 and 12. The provided thinning materials 15 and 15 supply nutrients such as nitrogen and phosphorus into the sea while gradually corroding over a long period of time. The corroded thinning materials 15 and 15 serve as food for insects such as boat insects, and the nutrients provided by the corroded thinning materials 15 and 15 generate a large amount of plankton. Gather and large seafood eating these small seafood also gather.
[0026]
FIG. 8 shows an operation method for replenishing or replacing the thinning materials 15, 15, wherein a wire 32 is hung from the tip of a crane 31 provided on a work boat 30, and a diver 33 slings on the seabed. To lift the hybrid reef 10 on the deck of the work boat 30, and manually remove the thinning materials 15, 15 and the columns 12, 12 in the respective wood storage boxes 14 a, 14 b, 14 c, 14 d by the worker 34. The thinning materials 15, 15 that have been erected are replenished or replaced. At the time of work, as shown in FIG. 5, by removing the bolts that fasten the support frames 26, 26 and the mounting brackets 22, 22, the respective wood storage boxes 14a, 14b, 14c, 14d are moved to the support frames 26, 26. , The work of replacing and replacing the thinned materials 15, 15 is facilitated.
[0027]
As explained above, the hybrid reef 10 according to the present invention not only has a purpose of gathering fish and shellfish like a conventional artificial reef, that is, not only forming a habitat and a hideout of fish, but also a thinning material 15, 15. It has a function of supplying food for insects such as zoocarnivores and feeding nutrients into the sea for a long period of time due to corrosion, and periodically replenishes or replaces thinning materials 15, 15. The major feature is that it can be done.
[0028]
【The invention's effect】
As described in detail above, according to the present invention, a thin structure of concrete / steel / thinned wood is used as a bait for insects such as helminths, while the thinned wood gradually corrodes over a long period of time, and By supplying nutrients such as nitrogen and phosphorus into the sea, a large amount of plankton is generated, and the aggregation effect of small seafood for eating plankton and insects and large seafood eating this small seafood is improved. Can be. In particular, since the thinned wood can be replenished or replaced periodically, it is possible to supply the food and nutrients of insects such as zootrophozoites to the sea for a long time with the corrosion of the thinned wood. .
[0029]
In addition, forestry workers can effectively use thinned timber, which has a relatively low utility value, to eliminate abandoned forests where thinning and other maintenance is not performed and to continue proper maintenance and management of forests. Can improve the livelihoods of forests and enhance the public functions of forests.
[0030]
Therefore, according to the present invention, since it is possible to replenish or replace the thinned wood with a hybrid structure of concrete, steel, and thinned wood, it is possible to install the thinned wood in the sea for a long time, By feeding the food and nutrients of insects such as carnivorous insects from the corroded thinned wood to the sea, it not only forms a habitat and hiding place for fish and shellfish, but also promotes the growth of fish and shellfish, and gathers fish and shellfish. It is possible to provide a hybrid fish reef with an increased value of the use of thinned wood as well as the height of the forest.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a hybrid reef according to the present invention.
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a perspective view showing a box main body constituting the wood storage box.
FIG. 4 is a perspective view showing an upper lid constituting the wood storage box.
FIG. 5 is a perspective view showing a wood storage box.
FIG. 6 is a perspective view of a main part showing a mounting structure of the wood storage box.
FIG. 7 is a sectional view of an essential part showing a structure for attaching a thinned material.
FIG. 8 is a schematic diagram showing an operation method when replacing and replacing thinned wood.
FIG. 9 is a perspective view showing an example of a conventional concrete fish reef.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Hybrid reef 11 ... Bottom board 11a ... Hole 12 ... Column 13 ... Cross beam 14a, 14b, 14c, 14d ... Wood storage box 15 ... Thinned wood 16 ... Box body 17, 21 ... L-shaped steel 18, 24 ... Steel plate 20 top cover 26 support frame 28 tubular body 30 work boat 31 crane 32 wire reference number P3637

Claims (3)

海底に設置する人工の魚礁であって、コンクリート・鋼材・間伐材の組合せでなるとともに、魚礁内に間伐材を補充もしくは取替交換可能に収納したことを特徴とするハイブリッド魚礁。A hybrid reef that is an artificial fish reef installed on the seabed, which is a combination of concrete, steel, and thinned wood, and in which the thinned wood is refilled or replaced in the fish reef. コンクリートの底盤上に中空ボックス状の鋼製骨組を構成し、該鋼製骨組の内部に複数段の木材収納ボックスを着脱自在に配置して、各木材収納ボックス内に間伐材を横置状として並置収納したことを特徴とするハイブリッド魚礁。A hollow box-shaped steel frame is formed on the concrete bottom, and a plurality of steps of wood storage boxes are detachably arranged inside the steel frame, and the thinned wood is placed horizontally in each of the wood storage boxes. A hybrid reef characterized by being stored side by side. コンクリートの底盤上に中空ボックス状の鋼製骨組を構成し、該鋼製骨組の内部に複数段の木材収納ボックスを着脱自在に配置して、各木材収納ボックス内に間伐材を横置状として並置収納し、鋼製骨組を構成する柱材を隠蔽する部位に、複数本の間伐材を補充もしくは取替交換可能に立設したことを特徴とするハイブリッド魚礁。A hollow box-shaped steel frame is formed on the concrete bottom, and a plurality of steps of wood storage boxes are detachably arranged inside the steel frame, and the thinned wood is placed horizontally in each of the wood storage boxes. A hybrid reef characterized by having a plurality of thinned woods refilled or replaced at a portion where the pillars constituting a steel frame are concealed and stored side by side.
JP2003142364A 2003-05-20 2003-05-20 Hybrid fish reef Pending JP2004344021A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006211985A (en) * 2005-02-07 2006-08-17 North Green:Kk Structure for undersea installation and method for activating marine resource
JP2007129913A (en) * 2005-11-08 2007-05-31 North Green:Kk Construction for undersea installation, method for activation of aquatic resource and weeding method
JP2011229519A (en) * 2010-04-08 2011-11-17 Hidenori Oka Wooden fish bank
JP2012223151A (en) * 2011-04-21 2012-11-15 Oishi Kensetsu Kk Artificial fish bank
JP2014140339A (en) * 2013-01-25 2014-08-07 Japan Reef Co Ltd Prey creature proliferative reef and method for replacing prey creature proliferative reef
CN104938371A (en) * 2014-03-28 2015-09-30 敖志辉 Circular net cage support plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006211985A (en) * 2005-02-07 2006-08-17 North Green:Kk Structure for undersea installation and method for activating marine resource
JP2007129913A (en) * 2005-11-08 2007-05-31 North Green:Kk Construction for undersea installation, method for activation of aquatic resource and weeding method
JP2011229519A (en) * 2010-04-08 2011-11-17 Hidenori Oka Wooden fish bank
JP2012223151A (en) * 2011-04-21 2012-11-15 Oishi Kensetsu Kk Artificial fish bank
JP2014140339A (en) * 2013-01-25 2014-08-07 Japan Reef Co Ltd Prey creature proliferative reef and method for replacing prey creature proliferative reef
CN104938371A (en) * 2014-03-28 2015-09-30 敖志辉 Circular net cage support plate

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