JP4386227B2 - Structure for creating seaweed beds - Google Patents

Structure for creating seaweed beds Download PDF

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JP4386227B2
JP4386227B2 JP2000265164A JP2000265164A JP4386227B2 JP 4386227 B2 JP4386227 B2 JP 4386227B2 JP 2000265164 A JP2000265164 A JP 2000265164A JP 2000265164 A JP2000265164 A JP 2000265164A JP 4386227 B2 JP4386227 B2 JP 4386227B2
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seaweed
seedling
seaweed seedling
pillar
base
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JP2002065102A (en
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靖美 白木
裕一 林
福宏 西平
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岡部株式会社
株式会社 金田建設
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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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Description

【0001】
【発明の属する技術分野】
本発明は、海藻類を中心とする藻場(海中林ともいう)を造成し、魚介類の繁殖をもたらすべく海中環境を改善するための技術に係り、立体的で永続性のある藻場の形成が可能な藻場造成用構造物に関する。詳しくは、海中において略鉛直方向に配設される柱状部を備え、海藻の着生床としても機能し得るコンクリートブロックなどの構造体(本明細書において「骨格構造体」と称する。)と、この骨格構造体に移植用海藻を取り付けるための海藻種苗担持具とを備え、特に海藻種苗担持具を柱状部の定められた位置に確実に取り付けることができるものである。
【0002】
【従来の技術】
現在、我国においては沿岸漁業の振興が重要な課題であり、魚介類、海藻類の増殖および養殖が図られている。しかるに、沿岸部においては種々の原因によって藻場が消滅し、藻場を生活の場としている魚介類が激減する、いわゆる「磯焼け」と呼ばれる現象が各地に拡大している。
【0003】
一般に、海藻は比較的浅い海底の岩石表面に着生して繁殖する。ところが、磯焼け海域では近くに母藻が存在しないため胞子の供給源がないことや、岩石が石灰藻で覆われ、海藻が着生し難いこと等により生育環境がきわめて悪い。また、砂泥質の海域では海藻の生育は元々困難である。したがって、このような磯焼け海域での藻場の再生や砂泥海域での藻場造りにおいては、海藻の移植を図ることが重要である。
【0004】
従来、藻場の造成方法としては、海中に種々の工夫を施した構造体を設置し、その構造体に海藻が自然着生するのを待って造成する方法などが知られている。しかしながら、これら従来方法は、自然着生に依存するため、特に重要な造成初期における海藻の着生状態が不確定な自然的要素によって大きく左右されるばかりか、造成に時間がかかるといった造成効率や確実性の点において根本的な問題があった。
【0005】
近年、ワカメ養殖で用いられている種苗糸と呼ばれる細い撚糸に予め造成用海藻の幼体を着生させ、この種苗糸をコンクリートブロック等からなる造成用構造物の適宜位置にそのまま巻き付けて海中に沈設することにより、その海藻種苗を核として造成用構造物の表面に海藻を着生させようとする試みがなされている。しかしながら、この従来方法は、造成用構造物に対する前記種苗糸の取付作業が難しいばかりかその取付状態が不安定であり、海中に設置済みの造成用構造物に対して適用することはほとんど困難であった。また、沈設後において種苗糸の取付状態に少しでも問題があると、細い糸状で形状的に不安定な種苗糸は、その問題個所から取付状態の悪化が拡大し、簡単に脱落してしまうといった欠点があった。特に、種苗糸自体の強度がほとんどないために海藻種苗をごく小さな幼体の状態で取り扱わなければならず、移植後において順調に着生しないことが多く、造成の成功率が低いものであった。このため、海藻種苗の移植手段として、上記のように種苗糸をそのまま適用する方法には多くの問題があり、実用化が進んでいないのが実情である。
【0006】
そこで、本出願人は、合成樹脂等の適度な弾性素材からなるリング状の担持基体に、適宜生育段階の海藻種苗を担持させた海藻種苗担持具を予め用意し、これを移植用海藻として造成用構造物(骨格構造体)の柱状部分の適宜位置に外嵌することにより、当該場所に着生した海藻種苗を基点として藻場造成を行う技術を既に提案している(特開平10−136813号、特開2000−139267号参照)。この柱状構造の造成用構造物と海藻種苗担持具の組合せによる藻場造成では、台船上での造成用構造物に対する海藻種苗の取付作業が容易になり、しかもその後の取付状態も安定する利点がある。特に、それら移植用海藻が海中においてほぼ鉛直方向に設置される柱状部に固定されることから、海藻種苗の生育の点において従来方法に比べて大幅に改善され、良好な成果が得られている。すなわち、造成用構造物の柱状部に適宜数の海藻種苗担持具を取り付ける形で海底に海藻種苗を導入することにより、海域の単位面積当りの海藻種苗の導入量を大きくすることが可能であり、しかも柱状部には酸素や栄養分が万遍なく行き渡り、また海藻の水深に対する生育条件も充足しやすく、食害や漂砂の影響を受け難いため、造成の成功率はきわめて高いものとなっている。
【0007】
【発明が解決しようとする課題】
ところで、上記従来技術において、造成用構造物の柱状部分の複数個所にそれぞれ移植用海藻を取り付ける場合には、隣り合う海藻が互いに競合しないように適度な間隔を確保することが重要であり、海藻種苗担持具の取付位置をきちんと管理する必要がある。また、空気中に置かれた海藻種苗は、時間の経過とともにその鮮度が低下し、特に生育段階の初期のものほどその劣化が急激であることから、台船上で移植用海藻を造成用構造物に取り付ける場合は、できる限り短時間で取付作業を済ませ、沈設することが望まれる。海藻種苗担持具の取付に手間取ると、その後の海藻種苗の生育にも大きく影響し、藻場造成の成功率低下が避けられない。したがって、施工に際しては、海藻の取付位置を目視で確認できるように、柱状部の取付予定個所に目印があると好都合である。このような施工上の要請に対して、特開2000−139267号公報に開示される藻場造成用構造物では、予め柱体外周面に適度な間隔をあけて複数の環状溝を設け、この環状溝内にリング状の海藻種苗担持具を嵌着する構成を採用したことにより、海藻種苗担持具を柱状部の適正な位置に迅速に取り付けることが可能となっている。しかも、海藻種苗担持具は環状溝内に確実に保持され、海流を受けても位置ずれが生じることはないので、海藻種苗担持具上にある海藻種苗の仮根が順調に伸長し、短期間で柱状部に着生できるものとなっている。
【0008】
上記従来例では、骨格構造体の一部を構成する柱体の素材として、一般的にはコンクリートや合成樹脂などが使用されるが、その製作には型枠あるいは金型等の柱体の外形形状に合せた適宜の型材が必要である。そして、上記のように外周面の所定位置に複数の環状溝を形成する場合、一般的にはそれら型材の内周面に環状溝形成のための突条部を設けることになる。しかるに、このような加工を施した型材は高価格であるばかりか、周面に何もない柱体を製造する場合に比べて製造工程の複雑化にもつながり、これが骨格構造体の製造コスト上昇の要因の一つとなっている。さらに、環状溝の位置が固定された専用の型材となってしまうことから、藻場造成の対象海域の環境に応じて設定される海藻種苗担持具の取付位置の変更には、基本的に対応することができないという問題点を有している。また、柱体外周面への環状溝の形成は、断面欠損となって柱体の強度低下の原因となることから、その補強手段を考慮する必要があり、それもコスト上昇の一因になっている。
【0009】
本出願人は、かかる藻場造成用構造物を広く普及させる要件として、低コストであると同時に設計の自由度の高いことが重要であることを踏まえ、改めて細部にわたり鋭意検討した結果、本発明による藻場造成用構造物に想到したのである。すなわち、骨格構造体の柱体外周面に環状溝を設けることなく、海藻種苗担持具を適正な位置に迅速に取り付けることが可能であって、その取付位置の変更に対しても簡単に対応することのできる藻場造成用構造物の提供を目的とするものである。
【0010】
【課題を解決するための手段】
上記課題を解決するため、請求項1に係る発明では、ブロック状の基盤に少なくとも1本の柱体を立設した骨格構造体に、海藻種苗を担持基体に担持させた海藻種苗担持具を、柱体の外周面に取り付けてなる藻場造成用構造物において、前記海藻種苗担持具が、柱体外周面の所定位置に固着した係止体にその担持基体を介して係着されるものであって、前記係止体および前記担持基体が略環状に形成され、各々に設けられている互いに掛合可能な掛合部を介して担持基体が係止体に積層状態で係着されることを特徴としている。
【0011】
すなわち、本発明によれば、海藻種苗担持具を取り付けるべき柱体外周面の所定位置に適宜形状の係止体が予め固着されており、この係止体に担持基体を係合させることにより海藻種苗担持具を係着するものであるから、係止体がそのまま取付位置の目印となり、海藻種苗担持具の取付を迅速に行うことができる。さらに、海藻種苗担持具は、柱体表面に固着されている係止体を介して係着されているので、沈設作業中にその位置がずれることはなく、沈設後においても海流等により柱体の周方向あるいは上下方向にずれ動くこともない。このため、海藻種苗担持具上の海藻種苗が短期間で柱体表面の所定の位置に確実に着生する。かかる柱体は、高価な専用型材を使わずに汎用の型材で作ることができるから安価であり、しかも断面欠損がないため強度的にも問題はない。さらに、係止体の固着位置は、柱体外周面上の任意の位置を選択することができるので、設計条件により海藻種苗担持具の取付位置を変更する場合でもその対応が容易である。
【0012】
また、請求項2に係る発明では、前記係止体と担持基体とが一対で環状体を形成するとともに、各々には互いに掛合可能な掛合部を設け、それら掛合部を介して担持基体が係止体に環状状態で係着されるようにし。いずれの場合においても、それぞれの係止体が海藻種苗担持具を取り付ける際の目印となり、しかも当該係止体により海藻種苗担持具が柱体の所定位置に確実に固定される。
【0013】
また、本願の請求項に係る発明によれば、ブロック状の基盤に少なくとも1本の柱体を立設した骨格構造体に、海藻種苗を担持基体に担持させた海藻種苗担持具を、柱体の外周面に取り付けてなる藻場造成用構造物において、前記海藻種苗担持具が、予め所定位置を残して養藻塗料を外周面に塗布した柱体の当該非塗布部に取り付けられることを特徴としている。この場合、柱体外周面の所定位置に存在する非塗布部が、取付位置の目印として機能するので、前記各発明と同様に海藻種苗担持具を迅速かつ確実に柱体の所定位置に取り付けることができる。さらに、柱体表面に取り付けられた海藻種苗は、近くに養藻塗料の塗膜層が存在することにより、それに含まれる栄養成分を吸収して良好に生育し、骨格構造体の全体に海藻が繁茂するようになる。
【0014】
前記発明における養藻塗料としては、一般の化成肥料を含む塗料でもよいが、その中でも本出願人の提案になる光合成細菌、多孔質粒子を用いた担体および当該光合成細菌の栄養成分からなる水域環境改善用塗料(特開平5−247378号公報参照)が特に好適である。この塗料を柱体表面に塗布した場合には、海藻類の高い着生率を維持し、かつ海藻の生育に必要な栄養分を長期間にわたり安定的に供給することができるので、藻場造成の核となる海藻種苗を育成する上で好都合である。
【0015】
【発明の実施の形態】
本発明の実施において、上記各発明で用いる海藻種苗担持具として種々の形態のものを選択することができる。すなわち、海藻種苗担持具とは、適宜の素材、形状からなる担持基体に移植用の海藻種苗を担持させたもので、当該担持基体を介在させた状態で取り扱うことにより、柱体への取付作業が容易になり、さらに取付作業中での海藻種苗の損傷を防止し、施工前の保管も容易になるなど、多くの利点がある。具体的には、例えば海藻種苗の担持基体としてロープやホース等の適度な太さと剛性を有する紐状体を使用し、これに前述の種苗糸を巻き付けるなどして海藻種苗を着生させ、海中において葉状部分が適宜大きさになるまで育成したものがある。この場合、長尺の紐状体の状態で育成したものを柱体の寸法に合わせて適宜長さに分割して使用したり、あるいはそのまま柱体に適用できる長さで育成してもよい。また、これら海藻種苗を着生させた紐状体からなる海藻種苗担持具は、そのままの状態で適用してもよいが、この紐状体を第一の担持基体とし、さらに棒状、帯状、板状等の適宜形状の第二の担持基体と組み合わせて柱体に適用することも可能であり、少なくとも一方に海藻種苗が着生しているこれら二つの担持基体が結合した状態のものも本発明でいう海藻種苗担持具に該当する。そして、柱体外周面の海藻種苗担持具の取付予定位置には、当該担持基体に適合した形状の係止体を予め選択して固着すればよい。すなわち、前者の紐状の担持基体を主体とする海藻種苗担持具の場合には、柱体側の係止体として、例えばL型状のものを取付予定位置の周方向に沿って複数個所に固着し、これらに担持基体部分を嵌入して係着することができる。また第二の担持基体を有する海藻種苗担持具にあっては、この第二の担持基体を係着可能な適宜形状の係止体を柱体の所定位置に予め固着し、当該第二の担持基体を介して取り付けることになる。
【0016】
前記第二の担持基体の具体例としては、合成樹脂等の可撓性材料を用いてC字状等の一個所が開放した略環状に形成し、その開放端部間を広げることにより当該柱体に対して横方向からの装着が可能であるもの、また同様な素材を略帯状に形成し、柱体への取付時にその周面に沿わせて環状に湾曲して取り付けるもの、さらに無端状の環として形成され、柱体に対してはその上端部から挿入するものなど、幾つかのタイプがある。ただし、いずれの場合であってもその一部に係止体との係着手段を備えたものとし、当該係着手段により係止される構成とすれば、海藻種苗担持具の固定をより確実なものとすることができ、特に海上での取付作業の迅速化にもつながる。なお、前者の略環状あるいは略帯状のような有端状基体では、素材自身が有する弾性あるいは端部に設けた掛止手段などにより、柱体への取着後もその環状状態を保持し得るものが好適であり、合成樹脂、ゴム、金属などの可撓性素材により形成する。合成樹脂の具体例としては、ポリアミド系樹脂、熱可塑性エラストマー、ポリウレタン、ポリオレフィン系樹脂などが挙げられる。
【0017】
また、前記紐状の担持基体に海藻種苗を着生させるには、一般にワカメ養殖などにおいて広く行われている方法を応用することができる。例えば、海藻遊走子が浮遊する水槽内にクレモナ(商品名)等の海藻遊走子の付着に適した種苗糸を浸漬してこれに海藻遊走子を付着させて発芽させた後、その種苗糸をそのままロープやホースなどの適度な太さを有する担持基体に螺旋巻きするなどして添着し、これを海中に水平に設置したり吊り下げるなどして、その担持基体に海藻幼体の仮根が付着して移植に耐えうる程度の適宜大きさになるまで育成する。ここで用いる海藻の種類としては、餌料としての利用を主目的とする場合にはアラメ、カジメ、クロメ等のコンブ科海藻が好ましく、その中でも環境に対する適応性が高いツルアラメが特に好適である。もちろんコンブ科海藻に限らずホンダワラ等の他の海藻種でも広く適用が可能である。なお、海藻種苗担持具として使用する際の海藻の大きさは、海藻の種類、施工時期、造成区域の環境等により異なるが、一般的には葉状部の長さが10cm程度以上が望ましい。なお、この海藻種苗付きの紐状体を第一の担持基体とし、上記第二の担持基体に結合して使用する場合には、第二の担持基体の長手方向に沿わせたり、あるいは所々に設けてもよく、長尺の紐状体の状態で海中にて育成したものを、必要な時に適宜長さに切断して使用することができる。この場合、海藻種苗担持具の状態で育成する必要はないので、海藻種苗担持具の生産に必要なスペースが少なくて済む。なお、第一の担持基体を第二の担持基体に結合するには、例えば第二の担持基体の外周面側に複数の鉤状部を所定間隔で形成してその内部に第一の担持基体を嵌入したり、あるいは別途ファスナーにより両者を結束するようにしてもよい。
【0018】
さらに、海藻の着生床となる骨格構造体は、例えば平面視十字状、矩形状等の適宜形状のコンクリート基盤に少なくとも1本の柱体を立設したものである。ここの柱体の素材としては、コンクリートの他に金属、木材、合成樹脂等の使用が可能であり、またその断面形状は円形に限らず多角形としたり、その内部を中空状にしてもよい。なお、柱状部の断面形状を多角形とした場合には、前記海藻種苗担持具における担持基体も当然それに適合した形状となる。そして、これら骨格構造体に対する前記海藻種苗担持具の取付作業は、一般的には目的とする海域の台船上で行うことが想定されるが、骨格構造体を沈設した後に海中において行ってもよい。このような場合でも、海藻種苗担持具の取付位置が明確であることから、作業を行う上で好都合である。
【0019】
【実施例】
以下、図面に基づき本願発明の実施例について説明する。図1および図2は、それぞれ本願発明の第一実施例において骨格構造体の柱体外周面に固着される係止体の平面図と正面図である。図示の係止体10は、適度な弾性を有する合成樹脂により開閉可能なリングとして形成された帯状本体11からなり、その一端部分に鉤状突起12が形成され、他端側には前記鉤状突起12と掛合して環状に連結保持するための掛止孔13が形成されている。この場合、帯状本体11の長さは、連結状態としたときに後述する骨格構造体の柱状部の外径に略一致する寸法に設定されている。さらに、両端の鉤状突起12と掛止孔13の近くには同様な形状の鉤状突起14がそれぞれ設けられるとともに、帯状本体11の一方の周端面側の3個所にほぼ等間隔で突出片15が一体に形成されている。このうちの一つは、鉤状突起12に対してリング中心を挟んだ向側の位置となっている。また、帯状本体11の他方の周端面側には、突出片15間の中間位置にそれよりも突出長の少ない二個の突出片16が設けられている。
【0020】
次に、図3および図4は、それぞれ本願発明の第一実施例において用いる海藻種苗担持具を後述する第一の担持基体と一体となって形成する第二の担持基体の平面図と正面図である。この第二の担持基体20は、弾性を有する合成樹脂により略C字状のリングとして形成され、帯状本体21の外側面の5個所に紐状の第一の担持基体を掛止するための略L字状の受部22が突設されている。この受部22の先端の内側には突起23が形成されるとともに、この突起23に対向するように帯状本体21の外周面にも軸心方向に突条24が設けられている。また、帯状本体21の中間部分の2個所に略U字状の膨出部25が外側に向けて突設され、帯状本体21の受部22の内面側には軸心方向に向けて5個の突起26が形成されている。そして、帯状本体21のそれぞれの端部近傍には一対の把手27が突設され、さらにそれよりも端部に近い位置には、上記係止体10の2個の鉤状突起14と掛合可能な掛止孔28が形成されている。なお、帯状本体21の3個所に連結手段29として軸心方向に貫通孔が穿設され、当該貫通孔に適宜の線材を挿通することにより、その複数を積み重ねて連結するときに利用される。このように連結すれば嵩張らないので、海藻種苗担持具とした状態での運搬や一時保管の際に好都合である。
【0021】
図5は、本願発明による藻場造成用構造物の第一実施例で使用する海藻種苗担持具の平面図である。図示の海藻種苗担持具1は、幼体以上の大きさの海藻種苗31が着生した紐状の第一の担持基体30が、上記第二の担持基体20の外周面に沿って添着された構成となっている。この第一の担持基体30は、第二の担持基体20の周長に近い長さのロープであり、その表面に海藻種苗31を着生させるには、公知の海藻養殖方法を利用することができる。例えば、水槽内で採苗した種苗糸(図示せず)を長尺のロープの表面に巻き付けるなどして固定し、この状態で海中において必要な大きさになるまで育成する。そして、第二の担持基体20の周長に応じて適宜の長さに分割する方法が効率的である。このようにして得られる海藻種苗付きの第一の担持基体30は、湾曲させながら第二の担持基体20の5個所の受部22にその開口部側から嵌入すると、受部22の開口部付近にある突起23により確実に掛止され、両者が一体のものとして取り扱うことができる。
【0022】
図6は、上記海藻種苗担持具1を骨格構造体2に取付中の状態を示す本発明による藻場造成用構造物の正面図である。この骨格構造体2は、コンクリートから形成された略十字状の基盤3に、同様な素材からなる円形の柱体4を十字の4個所の突出部分にそれぞれ1本ずつ立設したものである。各柱体4の外周面には、係止体10(図1、図2参照)が一定の間隔でそれぞれ5個ずつ所定の位置に予め固着されている。これらの係止体10は、帯状本体11の両端部を弾性に抗して拡げ、その間から柱体4の所定位置に外嵌し、鉤状突起12を掛止孔13に掛合して環状に結合する。この際、柱体4と帯状本体11の間には接着剤を介在させることにより確実に固着することができる。そして、海藻種苗担持具1を各係止体10に係着することにより、本発明による藻場造成用構造物が得られる。なお、図6において柱体4に対する係止体10の固着位置は、各柱体4でそれぞれ帯状本体11の両端の結合部分が十字の中心に対して反対側の位置にくるようにほぼ一直線上に揃えられているが、これとは逆に結合部分が十字の中心に向くようにすれば、海藻種苗担持具1を取り付ける場合に、基盤3の上面の中央に脚立等を置いて作業をする際に各柱体4に対する取付位置が近くなり、柱体4との距離によっては各柱体4毎にその都度上り下りする必要がなくなるので好都合である。
【0023】
図7は、海藻種苗担持具1の取付状態の要部を示す横断面図である。ここで、海藻種苗担持具1は、柱体4の外周面に固着されている前記係止体10に外側から重ねられ、この状態で第二の担持基体20における掛合部としての掛止孔28と係止体10で掛合部となる鉤状突起14とを掛合することにより確実に固定される。なお、具体的な取付手順について図6も参照しながら説明すると、作業者は係止体10の両端の結合部分に向って位置する。次に、手に持った海藻種苗担持具1を柱体4の背面側において第二の担持基体20の開放端側を拡げ、この状態で背面側から柱体4に外嵌し、係止体10に重ねる。この際、係止体10の結合部分の反対側に位置している突出片15は、係着前の海藻種苗担持具1を支えることができるので、特に海藻種苗31が大きい場合には作業者の負担の軽減に役立つ。そして、上記のように第二の担持基体20の掛止孔28を係止体10の鉤状突起14に掛合すれば、周方向および上下方向のいずれの方向にも動くことはなく、確実に固定される。なお、係止体10に設けられた二個の突出片16は、前記突出片15との間に海藻種苗担持具1を挟持することにより、上下方向の動きを規制するためのものである。
【0024】
このように、本発明による藻場造成用構造物においては、予め海藻種苗担持具1の取付予定位置にその目印となる係止体10が固着されているので、作業者は迷うことなく迅速かつ確実に海藻種苗担持具1を適正な位置に取り付けることができる。したがって、海上で取付作業を行う場合においては、移植用の海藻種苗31に与えるダメージが少なく、藻場造成の成功率向上につながる。因みに骨格構造体2における柱体4の長さは4m前後であり、その場合に1本あたりの柱体4に取り付ける海藻種苗担持具1は7個前後が好適であるが、設置場所の水深、使用する海藻種苗の種類等によっては適宜変更する。さらに、基盤3の上面側の稜部や柱体4の外周面に養藻塗料を塗布してもよい。
【0025】
なお、図8および図9は比較例を例示したもので、図8はその係止体の斜視図を示し、図9は当該係止体に対する海藻種苗担持具の取付状態の要部を示す横断面図である。ここで使用する係止体40は、固着すべき柱体4の曲面に適合した湾曲板の表面に2個の鉤状突起41が突設された形状をなし、接着剤を介して柱体4の所定位置に固着する場合を比較例として示したものである
【0026】
記実施例では、係止体10が海藻種苗担持具1の取付位置の目印としての役割に加え、柱体4に対する海藻種苗担持具1の固定をより強固にするための手段としても機能している。かかる藻場造成用構造物の施工においては、傷みやすい海藻種苗をいかに手早く柱体の所定位置に取り付けて沈設するかが、藻場造成の成功率を左右する重要な技術的事項である。したがって、係止体を使用することなく、海藻種苗担持具のみでも固定できる構造であれば、柱体の外周面にその取付位置を明示するだけでも、これに対応することができる。
【0027】
図10は、本願発明による藻場造成用構造物の第の実施例であって、係止体を使用しない事例である。すなわち、基盤3に立設される柱体4の外周面には、海藻種苗担持具5の取付予定位置を除き、養藻塗料からなる塗膜6が被覆され、海藻種苗担持具5は、養藻塗料が塗られていない非塗布部7を目印として取り付けられている。なお、図11は非塗布部7の形成方法を示したもので、柱体4の所定の位置に予めマスキングテープ8を巻き付け、これに適宜スプレーガン9等を用いて外周面全体に養藻塗料Pを塗布した後、マスキングテープ8を除去すると非塗布部7が形成される。この場合も前記実施例と同様に柱体4の表面には目印が存在することから、海藻種苗担持具5を適正な位置に迅速に取り付けることができる。ここで使用する海藻種苗担持具5において、その担持基体51は、図に明示しないが前記実施例で用いた海藻種苗担持具1における第二の担持基体20を改変したものである。すなわち、一端側の掛止孔28に代えて鉤状突起を設け、それを他端側の掛止孔28と掛合させることにより、自らが環状に連結できるもので、その他の部位の形状および海藻種苗31を着生させた第一の担持基体30を用いる点は同様である。したがって、適度な弾性を有する素材からなる第二の担持基体51の2個所に設けられた略U字状の膨出部の存在により、柱体4に対して弾発的に嵌着されることから、柱体4自体に係止体を設けなくとも所定の位置に確実に固定することができる。
【0028】
なお、上記各実施例では、海藻種苗31が着生している第一の担持基体30を第二の担持基体20,51に装着して一体化した形態のものを海藻種苗担持具として適用した場合について説明しているが、両者を分離した状態で取り扱うことも可能である。すなわち、海藻種苗31を着生させた第一の担持基体30をそのまま海藻種苗担持具とし、予め柱体4の所定位置に固着した第二の担持基体20,51に係着したり、前記第一実施例において、柱体4の所定位置に固着されている係止体10に対して予め第二の担持基体20のみを結合させ、沈設直前に前記海藻種苗付きの第一の担持基体30を海藻種苗担持具として第二の担持基体20に係着してもよい。また、第の実施例で使用する第二の担持基体51を柱体4に固着し、これに第一の担持基体30を取り付けてもよく、これらの作業手順を選択した場合、第二の担持基体20,51は係止体として機能し、同様な効果が得られる。さらに、海藻種苗担持具の骨格構造体への取付時期は、骨格構造体を沈設した後に海中で行ってもよく、この場合でもその取付位置が明確であることから作業性の向上につながる。
【0029】
また、上記各実施例では、骨格構造体2に立設される複数本の柱体4のすべてに海藻種苗担持具1を取り付けた場合について説明しているが、特に短期間での藻場造成を求めない場合には、複数本の柱体のうちの少なくとも1本に取り付け、そこで成熟した海藻から放出される遊走子を介して周囲に海藻を繁茂させることも可能であり、施工条件によっては海藻種苗担持具を1本の柱体に対して1個としてもよい。さらに、担持基体および係止体を別の素材や形状に変更したり、養藻塗料により海藻種苗担持具の取付位置を明示する場合に非塗布部の形やその形成方法を変更するなど、この発明の技術思想内での種々の変更実施はもちろん可能である。
【0030】
【発明の効果】
以上説明したように、本願発明の請求項1に係る藻場造成用構造物では、海藻種苗担持具を柱体外周面の所定位置に固着した係止体にその担持基体を係合させて係着する構成としたので、係止体がそのまま取付位置の目印となり、取付作業の迅速化を図ることができる。さらに、柱体表面に固着されている係止体を介して海藻種苗担持具が係着されることにより、柱体の所定位置からずれ動くことがないから、海藻種苗担持具上の海藻種苗が短期間で柱体表面に着生し、それを基点として周囲に海藻を繁茂させる。かかる柱体は、汎用の型材で作られた柱体の表面に、別途製作した係止体を固着すればよいから、高価な専用型材が不要で安価に製造することができ、しかも断面欠損がないので強度面でも問題はない。さらに、係止体の固着位置は、柱体外周面上の任意の位置を選択することができるので、設計条件により海藻種苗担持具の取付位置を変更する場合でもその対応が容易である。
【0031】
また、請求項2の構成とした場合においても、同様にそれぞれの係止体が海藻種苗担持具を所定位置に取り付ける際の目印となり、柱体表面に固着されている係止体により海藻種苗担持具が柱体の所定位置に確実に固定される。
【0032】
さらに、本願の請求項に係る発明によれば、骨格構造体の柱体外周面に、海藻種苗担持具の取付予定位置を残して養藻塗料を塗布し、当該非塗布部を目印として取り付けるものであるから、前記各請求項に係る発明と同様に海藻種苗担持具を迅速に柱体の所定位置に取り付けることができる。特に、この構成によれば、柱体表面に取り付けられた海藻種苗は、すぐ近くに養藻塗料の塗膜層が存在するため、それに含まれる栄養成分を吸収して良好に生育し、短期間での藻場造成を実現する。
【図面の簡単な説明】
【図1】 本願発明による藻場造成用構造物の第一実施例において使用する係止体の平面図である。
【図2】 図1に示す係止体の正面図である。
【図3】 本願発明による藻場造成用構造物の第一実施例において使用する担持基体の平面図である。
【図4】 図3に示す担持基体の正面図である。
【図5】 本願発明による藻場造成用構造物の第一実施例において使用する海藻種苗担持具の平面図である。
【図6】 図5の海藻種苗担持具を取付中の藻場造成用構造物の第一実施例を示す正面図である。
【図7】 図6における海藻種苗担持具の取付状態の要部を示す横断面図である。
【図8】 比較例において使用した係止体を例示した斜視図である。
【図9】 図8の比較例における海藻種苗担持具の取付状態の要部を示した横断面図である。
【図10】 海藻種苗担持具を取付中の藻場造成用構造物の第実施例を示す正面図である。
【図11】 図10で使用する柱体の塗装状態を示す説明図である。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for improving a marine environment in order to create seaweed beds (also referred to as underwater forests) centered on seaweeds and to bring about the reproduction of seafood, and The present invention relates to a structure for constructing a seaweed bed. Specifically, a structure such as a concrete block (referred to as a “skeletal structure” in the present specification) including a columnar portion disposed in a substantially vertical direction in the sea and functioning also as an agglomeration floor of seaweed; The skeletal structure is provided with a seaweed seedling carrying tool for attaching seaweed for transplantation, and in particular, the seaweed seedling carrying tool can be reliably attached to a predetermined position of the columnar portion.
[0002]
[Prior art]
Currently, the promotion of coastal fisheries is an important issue in Japan, and the growth and aquaculture of seafood and seaweed are being promoted. However, in the coastal areas, seaweed beds disappear due to various causes, and the so-called “burning” phenomenon, in which seafood that uses the seaweed beds as a place of life, drastically decreases, is spreading throughout the country.
[0003]
Generally, seaweed grows on a relatively shallow rock surface on the seabed. However, the habitat is extremely bad in the sea-burning sea area because there is no mother algae nearby, and there is no source of spores, and the rocks are covered with lime algae, making it difficult for seaweed to settle. In addition, seaweeds are originally difficult to grow in sandy mud. Therefore, it is important to transplant seaweed in such regeneration of seaweed beds in the seawater-burned sea area and construction of seaweed beds in sandy mud areas.
[0004]
2. Description of the Related Art Conventionally, as a method for creating a seaweed bed, a method is known in which a structure with various devices is installed in the sea, and the structure is created after seaweed naturally settles on the structure. However, since these conventional methods depend on natural settlement, the formation state of seaweed in the early stage of creation is not only greatly influenced by uncertain natural factors, but also the creation efficiency such as the time taken for creation. There was a fundamental problem in terms of certainty.
[0005]
In recent years, young seedlings of seedling seaweeds are preliminarily grown on a thin twisted thread called seedlings used in wakame culture, and the seedlings are wound around an appropriate position of a construction structure made of concrete blocks and set in the sea. Thus, an attempt has been made to cause seaweed to grow on the surface of the structure for construction using the seaweed seedling as a nucleus. However, this conventional method is not only difficult to attach the seedlings to the building structure, but also has an unstable mounting state, and it is almost difficult to apply to the building structure already installed in the sea. there were. In addition, if there is any problem with the attachment state of the seedlings after laying, the seedlings that are thin and unstable in shape will have a worsening of the attachment state from the problem area and will easily fall off. There were drawbacks. In particular, since the seedling thread itself has almost no strength, the seaweed seedling must be handled in a very small juvenile state, and often fails to grow smoothly after transplanting, and the success rate of creation is low. For this reason, as a means of transplanting seaweed seeds and seedlings, there are many problems in the method of applying seedlings and seeds as they are as described above, and the actual situation is that they have not been put into practical use.
[0006]
Therefore, the present applicant has prepared in advance a seaweed seedling support device in which a seaweed seedling supporter in an appropriate growth stage is supported on a ring-shaped support base made of an appropriate elastic material such as a synthetic resin, and created this as a seaweed for transplantation. Has already proposed a technique for constructing a seaweed bed by using a seaweed seedling that has grown in the place as a base by externally fitting it at an appropriate position of a columnar portion of a structure for use (skeletal structure) (Japanese Patent Laid-Open No. 10-136913). No. 2000-139267). The combination of this columnar structure for construction and the seaweed seedling support tool makes it easy to attach seaweed seedlings to the construction structure on a trolley, and also stabilizes the subsequent mounting conditions. is there. In particular, since the seaweed for transplantation is fixed to a columnar portion that is installed almost vertically in the sea, the growth of seaweed seedlings is greatly improved compared to conventional methods, and good results have been obtained. . In other words, it is possible to increase the amount of seaweed seedlings introduced per unit area of the sea area by introducing seaweed seedlings to the seabed with an appropriate number of seaweed seedling supporters attached to the columnar part of the construction structure. In addition, oxygen and nutrients spread throughout the columnar part, and the growth conditions with respect to the depth of seaweed are easy to satisfy, and it is difficult to be affected by food damage and sand drift, so the success rate of creation is extremely high.
[0007]
[Problems to be solved by the invention]
By the way, in the above prior art, when attaching the seaweed for transplantation to each of the plurality of columnar portions of the structure for building, it is important to secure an appropriate interval so that adjacent seaweeds do not compete with each other. It is necessary to properly manage the mounting position of the seedling carrier. In addition, the freshness of seaweed seedlings placed in the air decreases with time, and the deterioration is particularly rapid in the early stages of growth. In the case of attaching to the cable, it is desirable to complete the installation work in as short a time as possible and to set it down. If it takes time to install the seaweed seedling support tool, it will greatly affect the subsequent growth of seaweed seedlings, and the success rate of the seaweed seedling development is inevitable. Therefore, when constructing, it is convenient if there is a mark at the planned location of the columnar portion so that the seaweed mounting position can be visually confirmed. In response to such construction requirements, the seaweed bed construction structure disclosed in Japanese Patent Application Laid-Open No. 2000-139267 previously provided a plurality of annular grooves with appropriate intervals on the outer peripheral surface of the column, By adopting a configuration in which a ring-shaped seaweed seedling carrying tool is fitted in the annular groove, it is possible to quickly attach the seaweed seedling carrying tool to an appropriate position of the columnar portion. Moreover, since the seaweed seedling carrying tool is securely held in the annular groove and does not shift even when subjected to ocean currents, the temporary roots of the seaweed seedling seedlings on the seaweed seedling carrying tool are steadily extended, and a short period of time. It can be grown on the columnar part.
[0008]
In the above conventional example, concrete or synthetic resin is generally used as the material of the column constituting a part of the skeletal structure, but the outer shape of the column such as a mold or a mold is used for its production. An appropriate mold according to the shape is required. And when forming a some annular groove in the predetermined position of an outer peripheral surface as mentioned above, generally the protrusion part for annular groove formation will be provided in the inner peripheral surface of those mold materials. However, molds that have been processed in this way are not only expensive, but also lead to more complicated manufacturing processes compared to manufacturing columns with nothing on the peripheral surface, which increases the manufacturing cost of the skeletal structure. It is one of the factors. In addition, since the position of the annular groove becomes a fixed mold material, it is basically possible to change the mounting position of the seaweed seedling carrying tool set according to the environment of the target sea area for seaweed formation. It has the problem that it cannot be done. In addition, since the formation of the annular groove on the outer peripheral surface of the column body causes a cross-sectional defect and decreases the strength of the column body, it is necessary to consider its reinforcing means, which also contributes to an increase in cost. ing.
[0009]
The present applicant, as a requirement for widespread use of such a structure for constructing seaweed beds, is based on the fact that it is important to have a low cost and a high degree of design freedom. I came up with a structure for creating seaweed beds. That is, it is possible to quickly attach the seaweed seedling holding tool to an appropriate position without providing an annular groove on the outer peripheral surface of the pillar body of the skeletal structure, and it can easily cope with a change in the mounting position. An object of the present invention is to provide a structure for creating a seaweed bed.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention according to claim 1, a seaweed seedling carrying tool in which a seaweed seedling is carried on a carrying base on a skeletal structure in which at least one pillar is erected on a block-shaped base, In the algae bed construction structure attached to the outer peripheral surface of the pillar body, the seaweed seedling holding tool is fastened to a locking body fixed at a predetermined position on the outer peripheral face of the pillar body via the carrier base. The locking body and the support base are formed in a substantially annular shape, and the support base is fastened to the lock body in a stacked state via hooking portions provided on each of them. It is characterized by that.
[0011]
That is, according to the present invention, an appropriately-shaped locking body is fixed in advance to a predetermined position on the outer peripheral surface of the column body to which the seaweed seedling holding tool is to be attached. Since the seedling holding tool is engaged, the locking body serves as a mark of the mounting position as it is, and the seaweed seedling holding tool can be quickly attached. Furthermore, since the seaweed seedling carrying tool is attached via a locking body fixed to the surface of the column, the position thereof does not shift during the setting work, and the column by the ocean current after setting. It does not move in the circumferential direction or up and down direction. For this reason, the seaweed seedling seedling on the seaweed seedling seedling carrying tool is surely deposited at a predetermined position on the surface of the column body in a short period of time. Such a column body is inexpensive because it can be made of a general-purpose mold material without using an expensive dedicated mold material, and there is no problem in strength because there is no cross-sectional defect. Furthermore, since the fixing position of the locking body can be selected at any position on the outer peripheral surface of the pillar body, it is easy to cope with it even when the mounting position of the seaweed seedling carrier is changed according to the design conditions.
[0012]
Moreover, in the invention which concerns on Claim 2, the said A pair of the locking body and the supporting base form an annular body, and each is provided with an engaging portion that can be engaged with each other so that the supporting base is engaged with the engaging body in an annular state via the engaging portions. West The . In any case, each locking body serves as a mark when the seaweed seedling carrying tool is attached, and the seaweed seedling carrying tool is securely fixed to a predetermined position of the pillar body by the locking body.
[0013]
In addition, the claims of this application 3 According to the invention, the seaweed seedling carrying tool in which the seaweed seedling is carried on the carrying base is attached to the outer peripheral surface of the pillar body on the skeletal structure in which at least one pillar body is erected on the block-shaped base. The seaweed seedling construction structure according to the present invention is characterized in that the seaweed seedling supporter is attached to the non-applied portion of the pillar body, which has been applied in advance to the outer peripheral surface, leaving a predetermined position. In this case, since the non-application part existing at a predetermined position on the outer peripheral surface of the column body functions as a mark of the mounting position, the seaweed seedling carrier is quickly and surely mounted at the predetermined position of the column body as in the above inventions. Can do. Furthermore, the seaweed seedlings attached to the surface of the pillars grow well by absorbing the nutrients contained in the coating layer of the algae paint near it, and the seaweeds are found throughout the skeletal structure. Become prosperous.
[0014]
The algae paint in the invention may be a paint containing a general chemical fertilizer, and among them, a water environment comprising a photosynthetic bacterium proposed by the present applicant, a carrier using porous particles, and a nutrient component of the photosynthetic bacterium A coating for improvement (see JP-A-5-247378) is particularly suitable. When this paint is applied to the surface of the pillar body, it is possible to maintain a high growth rate of seaweeds and to stably supply nutrients necessary for seaweed growth over a long period of time. It is convenient for growing seaweed seedlings as a core.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In implementation of this invention, the thing of a various form can be selected as a seaweed seedling seedling support tool used by said each invention. In other words, the seaweed seedling carrying tool is a support base made of an appropriate material and shape carrying a seaweed seedling for transplantation, and is attached to the pillar body by handling it while the support base is interposed. There are many advantages, such as preventing damage to seaweed seedlings during installation, and facilitating storage before construction. Specifically, for example, a string-like body having an appropriate thickness and rigidity, such as a rope or a hose, is used as a supporting substrate for seaweed seedlings, and the seaweed seedlings are allowed to grow in the sea by wrapping the seedling yarns around them. In this case, the leafy portion is grown until it is appropriately sized. In this case, what is grown in the state of a long string-like body may be used by appropriately dividing the length according to the dimensions of the column, or may be grown as long as it can be applied to the column. In addition, the seaweed seedling carrying tool composed of a string-like body on which these seaweed seedlings are grown may be applied as it is, but this string-like body is used as a first carrying base, and further a rod-like, strip-like, plate It is also possible to apply to a pillar body in combination with a second support substrate having an appropriate shape such as a shape, and the present invention also includes a state in which these two support substrates having seaweed seedlings attached to at least one are combined. This corresponds to the seaweed seedling carrier. Then, a locking body having a shape suitable for the supporting substrate may be selected and fixed in advance at the planned mounting position of the seaweed seedling holding tool on the outer peripheral surface of the column body. That is, in the case of the seaweed seedling carrier mainly composed of the former string-like carrier substrate, for example, L-shaped anchors are fixed at a plurality of locations along the circumferential direction of the planned mounting position as the pillar side locking body. In addition, the supporting base portion can be fitted and engaged with them. Further, in the seaweed seedling carrier having the second carrier substrate, an appropriately shaped locking body capable of engaging the second carrier substrate is fixed in advance to a predetermined position of the column body, and the second carrier It is attached via the base.
[0016]
As a specific example of the second support substrate, a flexible material such as a synthetic resin is used to form a substantially annular shape in which one portion such as a C-shape is opened, and the space between the open ends is widened. Those that can be mounted on the body from the side, or that are made of a similar material in the form of a strip, and that are attached to the column by being bent in an annular shape along its circumference, and endless There are several types of pillars, such as those inserted from the upper end of the column. However, in any case, it is assumed that the engaging means for engaging with the engaging body is provided in a part thereof, and that the seaweed seedling carrying tool is more reliably fixed if the engaging means is used. In particular, it can lead to faster installation work at sea. In the former end-like substrate having a substantially annular or substantially band shape, the annular state can be maintained even after attachment to the column body by the elasticity of the material itself or the hooking means provided at the end. It is preferable to use a flexible material such as synthetic resin, rubber, or metal. Specific examples of the synthetic resin include polyamide resins, thermoplastic elastomers, polyurethanes, polyolefin resins, and the like.
[0017]
Moreover, in order to grow seaweed seedlings on the string-like support substrate, a method widely used in seaweed culture can be applied. For example, after seeding seedlings suitable for attachment of seaweed zoospores such as Cremona (trade name) in a water tank in which seaweed zoospores float, As it is, it is attached to a carrying base with an appropriate thickness such as a rope or hose by spiral winding, and this is placed horizontally in the sea or suspended to attach temporary roots of seaweed juveniles to the carrying base. And grow until the size is appropriate enough to withstand transplantation. As the type of seaweed used here, when the main purpose is to use it as a feed, comb seaweeds such as arame, kajime and kurome are preferred, and among them, pickled arame which is highly adaptable to the environment is particularly suitable. Of course, the present invention can be widely applied to other seaweed species such as Honda walla as well as the seaweed family. The size of the seaweed when used as a seaweed seedling carrier is different depending on the type of seaweed, the construction time, the environment of the creation area, etc., but generally the length of the leaf-shaped part is preferably about 10 cm or more. In addition, when this string-like body with seaweed seedlings is used as the first supporting substrate and is bonded to the second supporting substrate, it is along the longitudinal direction of the second supporting substrate or in some places. It may be provided, and a long string-like body grown in the sea can be used by appropriately cutting it when necessary. In this case, since it is not necessary to grow in the state of the seaweed seedling carrier, the space required for production of the seaweed seedling carrier is small. In order to bond the first carrier substrate to the second carrier substrate, for example, a plurality of hook-shaped portions are formed at predetermined intervals on the outer peripheral surface side of the second carrier substrate, and the first carrier substrate is formed therein. May be inserted, or both may be bound by a separate fastener.
[0018]
Furthermore, the skeletal structure used as the seaweed settlement floor is a structure in which at least one pillar is erected on a concrete base having an appropriate shape such as a cross in a plan view or a rectangular shape. In addition to concrete, metal, wood, synthetic resin, or the like can be used as the material of the column here, and the cross-sectional shape is not limited to a circle, and may be a polygon, or the inside may be hollow. . In addition, when the cross-sectional shape of a columnar part is made into a polygon, naturally the support base | substrate in the said seaweed seedling seedling support tool also becomes a shape suitable for it. And, it is assumed that the attachment work of the seaweed seedling carrier to these skeletal structures is generally performed on a pontoon in the target sea area, but may be performed in the sea after the skeletal structures are set. . Even in such a case, the mounting position of the seaweed seedling support tool is clear, which is advantageous in performing the work.
[0019]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a plan view and a front view, respectively, of a locking body fixed to a column body outer peripheral surface of a skeleton structure in the first embodiment of the present invention. The illustrated locking body 10 is composed of a band-like body 11 formed as a ring that can be opened and closed by a synthetic resin having moderate elasticity, and has a hook-like protrusion 12 formed at one end thereof, and the hook-like body at the other end. A hooking hole 13 is formed for engaging with the protrusion 12 and connecting and holding it in an annular shape. In this case, the length of the belt-like main body 11 is set to a dimension that substantially matches the outer diameter of the columnar portion of the skeleton structure described later when in the connected state. Further, hook-like protrusions 14 of the same shape are provided near the hook-like protrusions 12 and the hooking holes 13 at both ends, respectively, and protruding pieces at approximately equal intervals at three locations on one peripheral end surface side of the belt-like main body 11. 15 is integrally formed. One of them is located on the opposite side of the ring-shaped protrusion 12 with the center of the ring in between. Further, on the other peripheral end surface side of the strip-shaped main body 11, two projecting pieces 16 having a projecting length smaller than that are provided at an intermediate position between the projecting pieces 15.
[0020]
Next, FIGS. 3 and 4 are a plan view and a front view, respectively, of a second carrier base formed integrally with the first carrier base described later, which is a seaweed seedling carrier used in the first embodiment of the present invention. It is. The second carrier base 20 is formed as a substantially C-shaped ring from a synthetic resin having elasticity, and is used to hang the string-like first carrier base at five locations on the outer surface of the band-shaped main body 21. An L-shaped receiving portion 22 is projected. A protrusion 23 is formed inside the tip of the receiving portion 22, and a protrusion 24 is provided in the axial direction on the outer peripheral surface of the band-shaped main body 21 so as to face the protrusion 23. In addition, approximately U-shaped bulging portions 25 project outwardly at two locations in the middle portion of the belt-like main body 21, and five pieces are provided on the inner surface side of the receiving portion 22 of the belt-like main body 21 in the axial direction. The projection 26 is formed. A pair of grips 27 protrude from the vicinity of each end of the belt-like main body 21, and can be engaged with the two hook-like protrusions 14 of the locking body 10 at a position closer to the end. A hooking hole 28 is formed. It should be noted that through holes are formed in the axial direction as connecting means 29 at three locations on the belt-like main body 21, and an appropriate wire rod is inserted into the through holes to be used when a plurality of them are stacked and connected. Since it will not be bulky if it connects in this way, it is convenient at the time of carrying and temporary storage in the state made into the seaweed seedling carrier.
[0021]
FIG. 5 is a plan view of a seaweed seedling carrying tool used in the first embodiment of the structure for constructing a seaweed bed according to the present invention. The illustrated seaweed seedling carrier 1 has a configuration in which a string-like first carrier base 30 on which a seaweed seedling 31 larger than a juvenile is deposited is attached along the outer peripheral surface of the second carrier base 20. It has become. The first supporting substrate 30 is a rope having a length close to the circumference of the second supporting substrate 20, and a known seaweed cultivation method can be used to cause the seaweed seedling 31 to grow on the surface thereof. it can. For example, seed and seedlings (not shown) collected in a water tank are fixed by wrapping them around the surface of a long rope, and grown in this state until they reach the required size. A method of dividing the second carrier base 20 into an appropriate length according to the peripheral length of the second carrier base 20 is efficient. When the first carrier base 30 with the seaweed seedling obtained in this way is fitted into the five receiving parts 22 of the second carrier base 20 from the opening side while being curved, the vicinity of the opening part of the receiver part 22 The projection 23 is securely hooked so that both can be handled as a single unit.
[0022]
FIG. 6 is a front view of the structure for creating a seaweed bed according to the present invention showing a state in which the seaweed seedling carrier 1 is attached to the skeleton structure 2. This skeletal structure 2 has a substantially cross-shaped base 3 made of concrete, and circular pillars 4 made of the same material, standing one by one on four projecting portions of the cross. On the outer peripheral surface of each column 4, five locking bodies 10 (see FIGS. 1 and 2) are fixed in advance at predetermined positions at predetermined intervals. These locking bodies 10 expand both ends of the belt-like main body 11 against elasticity, and are externally fitted at predetermined positions of the column body 4 from between the ends, and the hook-like protrusions 12 are hooked into the hooking holes 13 to form an annular shape. Join. Under the present circumstances, it can fix reliably by interposing an adhesive agent between the pillar 4 and the strip | belt-shaped main body 11. FIG. Then, the seaweed seedling carrier 1 is engaged with each locking body 10 to obtain the structure for creating a seaweed bed according to the present invention. In FIG. 6, the fixing position of the locking body 10 with respect to the column body 4 is substantially in a straight line so that the coupling portions at both ends of the belt-like main body 11 are opposite to the center of the cross in each column body 4. On the contrary, if the connecting part is directed to the center of the cross, when the seaweed seedling carrier 1 is attached, a stepladder or the like is placed in the center of the upper surface of the base 3. At this time, the mounting position with respect to each column body 4 is close, and depending on the distance from the column body 4, it is not necessary to go up and down for each column body 4, which is convenient.
[0023]
FIG. 7 is a cross-sectional view showing the main part of the seaweed seedling carrier 1 in an attached state. Here, the seaweed seedling carrier 1 is overlaid from the outside on the locking body 10 fixed to the outer peripheral surface of the column 4, and in this state, the hook hole 28 as a hook portion in the second carrier base 20. And the hook-like protrusion 14 which becomes a hooking part by the latching body 10 is securely fixed. In addition, if it demonstrates, referring FIG. 6 for a specific attachment procedure, an operator will be located toward the coupling | bond part of the both ends of the latching body 10. FIG. Next, the seaweed seedling holding tool 1 held in the hand is expanded on the back end side of the second support base 20 on the back side of the column body 4, and in this state, the seaweed seedling support tool 1 is externally fitted to the column body 4 from the back side. Overlay on 10. At this time, the protruding piece 15 positioned on the opposite side of the coupling portion of the locking body 10 can support the seaweed seedling carrier 1 before being engaged, so that the worker is particularly large when the seaweed seedling 31 is large. Helps reduce the burden of Then, as described above, if the latching hole 28 of the second carrier base 20 is engaged with the hook-shaped protrusion 14 of the latching body 10, it does not move in any of the circumferential direction and the vertical direction, and reliably Fixed. The two protruding pieces 16 provided on the locking body 10 are for restricting the vertical movement by sandwiching the seaweed seedling carrier 1 with the protruding piece 15.
[0024]
As described above, in the structure for creating a seaweed bed according to the present invention, since the anchoring body 10 serving as a mark is fixed in advance to the position where the seaweed seedling carrier 1 is to be attached, the operator can quickly and without hesitation. The seaweed seedling carrier 1 can be reliably attached to an appropriate position. Therefore, when the installation work is performed at sea, there is little damage to the seaweed seedling 31 for transplantation, which leads to an improvement in the success rate of the seaweed development. Incidentally, the length of the column 4 in the skeletal structure 2 is about 4 m, and in that case, about 7 seaweed seedling supporters 1 to be attached to the column 4 per one are suitable. Change as appropriate depending on the type of seaweed seedling used. Furthermore, you may apply a nourishment paint to the ridge part of the upper surface side of the base | substrate 3, or the outer peripheral surface of the pillar 4.
[0025]
8 and 9 illustrate a comparative example, and FIG. FIG. 9 is a transverse cross-sectional view showing a main part of the state of attachment of the seaweed seedling carrier to the locking body. The locking body 40 used here has a shape in which two hook-shaped projections 41 are projected from the surface of a curved plate that matches the curved surface of the column 4 to be fixed. The case where it adheres to the predetermined position of the column 4 via an adhesive is shown as a comparative example. .
[0026]
Up Real In the embodiment, the locking body 1 0 is the sea In addition to serving as a mark of the mounting position of the algal seed seedling carrier 1, it also functions as a means for strengthening the fixation of the seaweed seedling seedling carrier 1 to the column 4. In the construction of such a structure for creating a seaweed bed, it is an important technical matter that determines the success rate of the seaweed bed construction, how quickly a perishable seaweed seedling is quickly attached to a predetermined position of the pillar. Therefore, if it is a structure that can be fixed only by a seaweed seedling carrying tool without using a locking body, it can be dealt with by simply indicating the mounting position on the outer peripheral surface of the pillar body.
[0027]
FIG. 10 shows the structure of the seaweed bed construction structure according to the present invention. two This is an example in which no locking body is used. That is, the outer peripheral surface of the column 4 standing on the base 3 is coated with a coating film 6 made of an algae paint except for a position where the seaweed seedling carrier 5 is scheduled to be attached. The non-application part 7 to which no algal paint is applied is attached as a mark. FIG. 11 shows a method of forming the non-applied portion 7. A masking tape 8 is wound around a predetermined position of the column 4 in advance, and an algae nourishing paint is applied to the entire outer peripheral surface using a spray gun 9 or the like as appropriate. After applying P, when the masking tape 8 is removed, the non-application part 7 is formed. Also in this case, since the mark is present on the surface of the column 4 as in the above embodiment, the seaweed seedling carrier 5 can be quickly attached to an appropriate position. In the seaweed seedling carrying tool 5 used here, the carrying base 51 is a modification of the second carrying base 20 in the seaweed seedling carrying tool 1 used in the above embodiment, although not explicitly shown in the figure. That is, a hook-like projection is provided in place of the one end side latching hole 28 and is engaged with the other end side latching hole 28 so that it can be connected in a ring shape. The point which uses the 1st support base | substrate 30 with which seedling 31 was made to grow is the same. Therefore, it is elastically fitted to the column body 4 due to the presence of the substantially U-shaped bulges provided at two locations of the second support base 51 made of a material having moderate elasticity. Therefore, it is possible to securely fix the column body 4 at a predetermined position without providing a locking body on the column body 4 itself.
[0028]
In each of the above-described embodiments, the first support substrate 30 on which the seaweed seedling 31 is grown is attached to the second support substrates 20 and 51 to be integrated as a seaweed seed support tool. Although the case is described, it is also possible to handle both in a separated state. That is, the first support substrate 30 on which the seaweed seedling 31 is grown is used as it is as a seaweed seedling support tool, and is attached to the second support substrates 20 and 51 that are fixed to the column body 4 at a predetermined position in advance. One implementation For example And fixed to a predetermined position of the column 4 Locking body 10 Alternatively, only the second support substrate 20 may be bonded in advance, and the first support substrate 30 with the seaweed seedling seedling may be engaged with the second support substrate 20 as a seaweed seedling support tool immediately before settling. The second two The second support base 51 used in the embodiment may be fixed to the column 4 and the first support base 30 may be attached thereto. When these work procedures are selected, the second support base 20, 51 functions as a locking body, and a similar effect is obtained. Furthermore, the attachment time of the seaweed seedling supporter to the skeleton structure may be performed in the sea after the skeleton structure is set. Even in this case, since the attachment position is clear, the workability is improved.
[0029]
Moreover, although each said Example demonstrated the case where the seaweed seedling seedling support tool 1 was attached to all the several pillars 4 standingly arranged by the frame | skeleton structure 2, especially seaweed bed construction in a short period of time is demonstrated. If not required, it is possible to attach it to at least one of the pillars and allow the seaweed to proliferate through the zoospores released from the mature seaweed. It is good also as one seaweed seedling seedling support tool with respect to one pillar. In addition, the carrier base and the locking body can be changed to different materials and shapes, or when the mounting position of the seaweed seedling carrier is clearly indicated by the algae paint, the shape of the non-applied part and the method of forming it can be changed. Of course, various modifications within the technical idea of the invention are possible.
[0030]
【The invention's effect】
As described above, in the structure for creating a seaweed bed according to claim 1 of the present invention, the seaweed seedling support is engaged with the support base fixed to a predetermined position on the outer peripheral surface of the column body. Since it is configured to be worn, the locking body serves as a mark of the mounting position as it is, and the mounting work can be speeded up. Furthermore, since the seaweed seedling carrying tool is fastened through the locking body fixed to the surface of the pillar body, the seaweed seedling seedling holder on the seaweed seedling carrying tool does not move from a predetermined position of the pillar body. It grows on the surface of the column in a short period of time, and seaweed grows around it. Such a column body can be manufactured inexpensively without the need for an expensive dedicated mold material, since a separately manufactured locking body may be fixed to the surface of a column body made of a general-purpose mold material. There is no problem in terms of strength. Furthermore, since the fixing position of the locking body can be selected at any position on the outer peripheral surface of the pillar body, it is easy to cope with it even when the mounting position of the seaweed seedling carrier is changed according to the design conditions.
[0031]
Claims 2 Even in the case of the configuration, similarly, each of the locking bodies serves as a mark for attaching the seaweed seedling holding tool to a predetermined position, and the seaweed seedling holding tool is fixed to the pillar body by the locking body fixed to the column surface. Securely fixed in position.
[0032]
Further claims of the present application 3 According to the invention according to the present invention, the algae coating is applied to the columnar outer peripheral surface of the skeletal structure leaving the planned mounting position of the seaweed seedling supporter, and the non-application part is attached as a mark. As in the invention according to the claims, the seaweed seedling carrier can be quickly attached to a predetermined position of the column. In particular, according to this configuration, the seaweed seedling attached to the surface of the pillar body has a coating layer of the algae paint in the immediate vicinity, so it absorbs the nutrients contained in it and grows well, and has a short period. Realization of seaweed beds in Japan.
[Brief description of the drawings]
FIG. 1 is a plan view of a locking body used in a first embodiment of a structure for creating seaweed beds according to the present invention.
FIG. 2 is a front view of the locking body shown in FIG.
FIG. 3 is a plan view of a supporting substrate used in the first embodiment of the structure for creating seaweed beds according to the present invention.
4 is a front view of the carrier substrate shown in FIG. 3. FIG.
FIG. 5 is a plan view of a seaweed seedling carrying tool used in the first embodiment of the structure for creating a seaweed bed according to the present invention.
6 is a front view showing a first embodiment of a structure for constructing a seaweed bed in which the seaweed seedling carrying tool of FIG. 5 is being attached. FIG.
7 is a cross-sectional view showing the main part of the seaweed seedling carrier mounting state in FIG.
[Fig. 8] Illustrated the locking body used in the comparative example It is a perspective view.
FIG. 9 is a diagram of FIG. The main part of the mounting state of the seaweed seedling carrier in the comparative example was shown It is a cross-sectional view.
FIG. 10 shows the structure of the seaweed bed construction structure with the seaweed seedling supporter attached. two It is a front view which shows an Example.
FIG. 11 is an explanatory diagram showing a painted state of the column used in FIG. 10;

Claims (3)

ブロック状の基盤に少なくとも1本の柱体を立設した骨格構造体に、海藻種苗を担持基体に担持させた海藻種苗担持具を、柱体の外周面に取り付けてなる藻場造成用構造物において、前記海藻種苗担持具は、柱体外周面の所定位置に固着した係止体にその担持基体を介して係着されるものであって、前記係止体および前記担持基体が略環状に形成され、各々に設けられている互いに掛合可能な掛合部を介して担持基体が係止体に積層状態で係着されることを特徴とする藻場造成用構造物。Seaweed seedling construction structure in which a seaweed seedling carrying tool in which a seaweed seedling is carried on a carrying base is attached to the outer peripheral surface of the pillar on a skeletal structure in which at least one pillar is erected on a block-shaped base The seaweed seedling supporter is attached to a locking body fixed to a predetermined position on the outer peripheral surface of the pillar body via the supporting base, and the locking body and the supporting base are substantially annular. A structure for forming a seaweed bed, characterized in that the support substrate is engaged with the engaging body in a stacked state through the engaging portions that are formed and can be engaged with each other . ブロック状の基盤に少なくとも1本の柱体を立設した骨格構造体に、海藻種苗を担持基体に担持させた海藻種苗担持具を、柱体の外周面に取り付けてなる藻場造成用構造物において、前記海藻種苗担持具は、柱体外周面の所定位置に固着した係止体にその担持基体を介して係着されるものであって、前記係止体および前記担持基体が一対で環状体を構成し、各々に設けられている互いに掛合可能な掛合部を介して担持基体が係止体に環状状態で係着されることを特徴とする藻場造成用構造物。 Seaweed seedling construction structure in which a seaweed seedling carrying tool in which a seaweed seedling is carried on a carrying base is attached to the outer peripheral surface of the pillar on a skeletal structure in which at least one pillar is erected on a block-shaped base The seaweed seedling holding tool is attached to a locking body fixed to a predetermined position on the outer peripheral surface of the pillar body via the supporting base, and the locking body and the supporting base are annular in a pair. A structure for constructing seaweed beds , characterized in that the support base is engaged with the engaging body in an annular state via engaging portions provided on each of them and capable of engaging with each other . ブロック状の基盤に少なくとも1本の柱体を立設した骨格構造体に、海藻種苗を担持基体に担持させた海藻種苗担持具を、柱体の外周面に取り付けてなる藻場造成用構造物において、前記海藻種苗担持具は、予め所定位置を残して養藻塗料を外周面に塗布した柱体の当該非塗布部に取り付けられることを特徴とする藻場造成用構造物。Seaweed seedling construction structure in which a seaweed seedling carrying tool in which a seaweed seedling is carried on a carrying base is attached to the outer peripheral surface of the pillar on a skeletal structure in which at least one pillar is erected on a block-shaped base The seaweed seedling carrier is attached to the non-applied portion of the pillar body, which has been previously applied to the outer peripheral surface with a predetermined position, leaving a predetermined position.
JP2000265164A 2000-09-01 2000-09-01 Structure for creating seaweed beds Expired - Lifetime JP4386227B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103299931A (en) * 2013-06-04 2013-09-18 浙江海洋学院 Self-sinking fish reef proliferation method
CN112049147A (en) * 2020-09-14 2020-12-08 浙江大学 Cultivation net cage construction method based on built offshore wind power multi-pile bearing platform foundation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103299931A (en) * 2013-06-04 2013-09-18 浙江海洋学院 Self-sinking fish reef proliferation method
CN103299931B (en) * 2013-06-04 2015-02-04 浙江海洋学院 Self-sinking fish reef proliferation method
CN112049147A (en) * 2020-09-14 2020-12-08 浙江大学 Cultivation net cage construction method based on built offshore wind power multi-pile bearing platform foundation

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