JP2007204992A - Up welling current-generating submarine artificial levee and its construction method - Google Patents

Up welling current-generating submarine artificial levee and its construction method Download PDF

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JP2007204992A
JP2007204992A JP2006023583A JP2006023583A JP2007204992A JP 2007204992 A JP2007204992 A JP 2007204992A JP 2006023583 A JP2006023583 A JP 2006023583A JP 2006023583 A JP2006023583 A JP 2006023583A JP 2007204992 A JP2007204992 A JP 2007204992A
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upwelling
steel pipe
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levee
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JP4539989B2 (en
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Atsushi Nagahama
淳 永濱
Hideyuki Kida
英之 木田
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Nippon Steel Engineering Co Ltd
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    • Y—GENERAL 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a up welling current-generating submarine artificial levee which enables a structure necessary for the generation of up welling current to be constructed as a lightweight structure of a minimum necessary size and which can be easily installed in a proper installation place on the bottom of the sea from on the ocean, and a construction method for the up welling current-generating submarine artificial levee. <P>SOLUTION: This up welling current-generating submarine artificial levee comprises: a steel-pipe truss structure 100 which is composed of three main steel pipes 110 each arranged in such a manner as to correspond to three axial edges of a virtual trigonal prism, and a plurality of connecting materials 120 for connecting the main steel pipes to one another; and at least two shielding plates 130 which are elongated in the axial direction of the main steel pipe on the outer peripheral surface or inside of the steel-pipe truss structure, and which have surface angles different from each other. A hollow space inside the main steel pipe is sealed, and water can be injected into the sealed hollow space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は，湧昇流発生海底人工堤及びその施工方法に関する。   The present invention relates to a submarine artificial dam that generates upwelling currents and a construction method therefor.

海底には，栄養塩類を豊富に含んだ水平方向の底層流が形成されている。海底から海面方向へ流れる湧昇流を人工的に発生させることによって，栄養塩類が乏しい海面付近の表層に栄養塩類を上昇させる技術が提案されている。かかる技術により，太陽光が届く有光層である表層に栄養塩類が到達するため，光合成作用を伴って植物プランクトンが増殖し，海域の基礎生産力が増加する。すなわち，食物連鎖に基づいて，植物プランクトンの増殖によって，動物プランクトン，次いで魚類が増殖するため，漁獲高の増加を図ることができる良好な漁場を形成することができる。   At the bottom of the sea, a horizontal bottom current containing abundant nutrients is formed. Techniques have been proposed to raise nutrients to the surface layer near the sea surface where nutrients are scarce by artificially generating upwelling currents that flow from the sea floor toward the sea surface. With this technology, nutrient salts reach the surface layer, which is a lighted layer to which sunlight can reach, so that phytoplankton grows with photosynthesis and increases the basic productivity of the sea area. In other words, based on the food chain, zooplankton and then fish grow through the growth of phytoplankton, so that it is possible to form a good fishing ground that can increase the catch.

湧昇流を発生させる技術として，例えば，特許文献１には，海底に自然石やコンクリートブロックを積み上げてマウンド状の構造物を形成し，底層流を当該構造物に沿わせることによって，底層流を海面方向へ上昇させる技術が提案されている。また，海底に構造物を形成し，湧昇流を発生させる技術として，例えば，特許文献２には，角錐形状の架台と架台に斜設された複数の円筒柱から構成される構造物を形成する技術が提案され，特許文献３には，３方向に壁部を有する構造物を形成する技術が提案されている。   As a technique for generating the upwelling flow, for example, in Patent Document 1, a natural stone or concrete block is stacked on the seabed to form a mound-like structure, and the bottom layer flow is made to follow the structure, thereby forming the bottom layer flow. A technology to raise the sea level toward the sea surface has been proposed. In addition, as a technology for forming a structure on the seabed and generating upwelling flow, for example, Patent Document 2 discloses a structure composed of a pyramid-shaped frame and a plurality of cylindrical columns obliquely installed on the frame. A technique for forming a structure having walls in three directions is proposed in Patent Document 3.

特開平５−１２３０７６号公報JP-A-5-123076 特開平８−３０８４２６号公報JP-A-8-308426 特開平７−５４３２２号公報Japanese Patent Laid-Open No. 7-54322

しかしながら，上記従来の特許文献１の技術によれば，海底の深さや海流の条件により構造物が大規模となった場合などには，洋上から海底へ投入される自然石やコンクリートブロックの投入量が多くなり，施工期間が長期化し，材料費や輸送費などを含めた施工コストが高価となるという問題があった。   However, according to the technology of the above-mentioned conventional Patent Document 1, when the structure becomes large due to the depth of the seabed or the conditions of the ocean current, the amount of natural stones and concrete blocks that are thrown into the seabed from the ocean However, there was a problem that the construction period was prolonged, and construction costs including material costs and transportation costs became expensive.

また，特許文献２や特許文献３の技術によれば，湧昇流を発生させるための構造物を地上で作成し，海上輸送する。そして，構造物の規模によっては，構造物を設置する現場で，大型の起重機船を使用して，構造物を海底に沈降する必要があり，施工にかかる時間とコストが嵩むという問題があった。   Moreover, according to the technique of patent document 2 and patent document 3, the structure for generating upwelling current is created on the ground, and is transported by the sea. Depending on the scale of the structure, it is necessary to sink the structure to the sea floor using a large hoist at the site where the structure is to be installed, which increases the time and cost for construction. .

そこで，本発明は，上記問題に鑑みてなされたものであり，本発明の目的とするところは，湧昇流の発生に必要な構造物を必要最小限の大きさかつ軽量の構造体で構築することができ，洋上から海底の適切な設置箇所に容易に設置することが可能な，新規かつ改良された湧昇流発生海底人工堤及び湧昇流発生海底人工堤の施工方法を提供することにある。   Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to construct a structure necessary for the generation of upwelling flow with a minimum size and a lightweight structure. To provide a new and improved upwelling generation submarine artificial levee and a method of constructing upwelling generation submarine artificial levee that can be installed at an appropriate location on the seabed from the ocean. It is in.

上記課題を解決するために，本発明のある観点によれば，仮想三角柱の軸方向の３つの稜に対応するようにそれぞれ配置された３本の主鋼管と，主鋼管を相互に連結する複数の連結材とからなる鋼管トラス構造体と；鋼管トラス構造体の外周面または内部に主鋼管の軸方向に延設され，相異なる面角度を有する少なくとも２枚の遮蔽板と；を備え，主鋼管内部の中空空間は，密閉されており，密閉された中空空間に注水可能に構成されたことを特徴とする，湧昇流発生海底人工堤が提供される。   In order to solve the above-described problem, according to one aspect of the present invention, three main steel pipes respectively arranged so as to correspond to three ridges in the axial direction of the virtual triangular prism and a plurality of main steel pipes connected to each other A steel pipe truss structure comprising: a connecting material of at least two shielding plates extending in the axial direction of the main steel pipe on the outer peripheral surface or inside of the steel pipe truss structure and having different surface angles; A hollow space inside the steel pipe is sealed, and an artificial submarine dam with upwelling flow is provided, which is characterized in that water can be poured into the sealed hollow space.

かかる構成により，遮蔽板は，海底を水平に流れている底層流を遮断して，海底から海面方向へ海流の流れ方向を転向させるので，湧昇流発生海底人工堤は，湧昇流を発生させることができる。また，主鋼管内部に密閉された中空空間を有するので，鋼管トラス構造体は，軽量であり，浮力によって洋上に浮遊する。そして，主鋼管内部の中空空間に海水を注入した場合，鋼管トラス構造体は，鋼管トラス構造体及び注入された海水による重力と，鋼管トラス構造体にかかる浮力との均衡によって，海中に徐々に沈降する。その結果，主鋼管と連結材とからなる鋼管トラス構造体は，湧昇流の発生に必要な湧昇流発生海底人工堤を必要最小限の大きさかつ軽量の構造体で構築することができる。また，洋上から海底の適切な設置箇所に容易に湧昇流発生海底人工堤を設置することができる。   With this configuration, the shielding plate blocks the bottom layer flow that flows horizontally across the seabed and diverts the flow direction of the ocean current from the bottom to the sea surface. Can be made. In addition, since the main steel pipe has a sealed hollow space, the steel pipe truss structure is lightweight and floats on the ocean by buoyancy. When seawater is injected into the hollow space inside the main steel pipe, the steel pipe truss structure gradually moves into the sea due to the balance between the gravity of the steel pipe truss structure and the injected seawater and the buoyancy on the steel pipe truss structure. Settling. As a result, the steel pipe truss structure consisting of the main steel pipe and the connecting material can be constructed with the minimum required size and lightweight structure for the upwelling generation submarine artificial dam necessary for generating upwelling flow. . In addition, it is possible to easily install an artificial submarine embankment that generates upwelling current from an offshore location at an appropriate location on the seabed.

また，上記連結材は，鋼管で構成されており，連結材内部の中空空間に注水可能に構成されてもよい。かかる構成により，連結材は，中空空間を有するため，鋼管トラス構造体は，軽量となり，浮力によって洋上に浮遊する。そして，連結材の中空空間に海水を注入した場合，湧昇流発生海底人工堤及び注入された海水による重力によって，湧昇流発生海底人工堤を海中に沈降させることができる。なお，上記連結材は，鋼管で構成される例に限定されず，例えば，棒鋼，Ｈ型鋼など任意の鋼材，他の材質の部材または組立部材などであってもよい。   Moreover, the said connection material is comprised with the steel pipe, and may be comprised so that water can be poured into the hollow space inside a connection material. With such a configuration, since the connecting material has a hollow space, the steel pipe truss structure is lightweight and floats on the ocean by buoyancy. When seawater is injected into the hollow space of the connecting material, the upwelling generation seabed artificial levee and the gravity due to the injected seawater can be submerged into the sea. In addition, the said connection material is not limited to the example comprised with a steel pipe, For example, arbitrary steel materials, such as bar steel and H-shaped steel, the member of another material, or an assembly member etc. may be sufficient.

また，上記遮蔽板は，鋼管トラス構造体内部に，相異なる面角度を有して３枚配設され，３枚の遮蔽板の一側端部は，３本の主鋼管にそれぞれ接合され，３枚の遮蔽板の他側端部は，鋼管トラス構造体内部において相互に接合されてもよい。かかる構成により，鋼管トラス構造体内部で，３枚の遮蔽板が相互に接合されているため，少ない材料で遮蔽板を構成することができる。また，海底に設置された湧昇流発生海底人工堤の接地面が，鋼管トラス構造体の外周面３面のうちどの面であっても，遮蔽板は，海底を水平に流れている底層流を遮断して，海底から海面方向へ海流の流れ方向を転向させるように配置されているので，湧昇流発生海底人工堤は，湧昇流を発生させることができる。   Further, the three shielding plates are arranged in the steel pipe truss structure with different surface angles, and one end of each of the three shielding plates is joined to the three main steel pipes, The other end portions of the three shielding plates may be joined to each other inside the steel pipe truss structure. With this configuration, since the three shielding plates are joined to each other inside the steel pipe truss structure, the shielding plate can be configured with a small amount of material. In addition, regardless of the three outer peripheral surfaces of the steel pipe truss structure, the shielding plate is a bottom layer flow that flows horizontally across the sea floor. Is arranged so that the flow direction of the ocean current is diverted from the sea floor to the sea surface, so the upwelling artificial seabed can generate the upwelling current.

また，湧昇流発生海底人工堤は，少なくとも３つの鋼管トラス構造体を備え，鋼管トラス構造体の軸方向の一端は，相互に接合されてもよい。かかる構成により，湧昇流発生海底人工堤を海底に設置する場合に，湧昇流発生海底人工堤がいかなる方向を向いたとしても，遮蔽板の向きは，海底を水平に流れている底層流を遮断して，海底から海面方向へ海流の流れ方向を転向させるような向きとなるので，湧昇流発生海底人工堤は，湧昇流を発生させることができる。また，湧昇流発生海底人工堤の設置方向を制御せずに，湧昇流発生海底人工堤を着底させることができるので，施工が容易かつ迅速になる。   Further, the upwelling generation submarine artificial dam may include at least three steel pipe truss structures, and one ends of the steel pipe truss structures in the axial direction may be joined to each other. With this configuration, when the upwelling seabed artificial levee is installed on the seabed, no matter which direction the upwelling seabed artificial dam faces, the direction of the shielding plate is the bottom layer flow that flows horizontally across the seabed. Since the direction of the flow of the ocean current is diverted from the sea bottom to the sea surface, the upwelling generation submarine artificial levee can generate the upwelling current. In addition, since the seabed artificial levee generating upwelling flow can be settled without controlling the installation direction of the seabed artificial levee generating upwelling current, construction becomes easy and quick.

また，上記主鋼管内部において，密閉された中空空間を区分する１または２以上の隔壁を備えてもよい。かかる構成により，主鋼管内部に複数の中空空間が形成されるため，主鋼管内部の中空空間に海水を注入する場合，注水する中空空間と注水しない中空空間とに分けることができる。その結果，湧昇流発生海底人工堤を沈降させる際，湧昇流発生海底人工堤を傾斜させることなく，鋼管トラス構造体の長手方向のバランスを維持して，略水平に沈降させることができる。   Moreover, you may provide the 1 or 2 or more partition which divides the sealed hollow space inside the said main steel pipe. With this configuration, since a plurality of hollow spaces are formed inside the main steel pipe, when seawater is injected into the hollow space inside the main steel pipe, it can be divided into a hollow space where water is poured and a hollow space where water is not poured. As a result, when sinking an upwelling submarine artificial levee, the steel pipe truss structure can be submerged substantially horizontally while maintaining the longitudinal balance of the steel pipe truss structure without tilting the upwelling submarine artificial levee. .

また，衝撃緩衝材が，上記主鋼管の外周面に設けられてもよい。かかる構成において，衝撃吸収材は，湧昇流発生海底人工堤の海底への着底時に生じる衝撃を吸収するので，湧昇流発生海底人工堤が破損することを防止できる。   Further, an impact buffering material may be provided on the outer peripheral surface of the main steel pipe. In such a configuration, the shock absorber absorbs an impact generated when the upwelling generation seabed artificial levee settles on the seabed, so that the upwelling generation seabed artificial levee can be prevented from being damaged.

上記課題を解決するために，本発明の別の観点によれば，上記の湧昇流発生海底人工堤を設置箇所の洋上に浮遊させる工程と；海水を湧昇流発生海底人工堤の主鋼管内部の密閉された中空空間に注水する工程と；湧昇流発生海底人工堤を設置箇所に沈降させる工程と；を含むことを特徴とする，湧昇流発生海底人工堤の施工方法が提供される。   In order to solve the above-mentioned problems, according to another aspect of the present invention, a process of floating the above-mentioned upwelling generation submarine artificial levee over the installation site; and a main steel pipe of the upwelling generation submarine artificial levee; There is provided a method for constructing an artificial submarine levee for generating upwelling flow, comprising the steps of pouring water into a sealed hollow space inside; The

かかる構成により，湧昇流発生海底人工堤の鋼管トラス構造体は，中空空間を有するので，湧昇流発生海底人工堤を洋上に浮遊させることができる。さらに，当該中空空間に海水を注入することができる。また，鋼管トラス構造体内部の中空空間に海水を注入した場合，鋼管トラス構造体は，鋼管トラス構造体及び注入された海水による重力と，鋼管トラス構造体にかかる浮力との均衡によって，海中に徐々に沈降させることができる。その結果，主鋼管と連結材とからなる鋼管トラス構造体は，湧昇流の発生に必要な湧昇流発生海底人工堤を必要最小限の大きさかつ軽量の構造体で構築することができる。また，湧昇流発生海底人工堤は，洋上から海底の適切な場所に容易に設置される。   With this configuration, the steel truss structure of the upwelling generation submarine artificial levee has a hollow space, so that the upwelling generation submarine artificial levee can be suspended on the ocean. Furthermore, seawater can be injected into the hollow space. In addition, when seawater is injected into the hollow space inside the steel truss structure, the steel truss structure is submerged in the sea due to the balance between the gravity of the steel pipe truss structure and the injected seawater and the buoyancy on the steel truss structure. It can be gradually settled. As a result, the steel pipe truss structure consisting of the main steel pipe and the connecting material can be constructed with the minimum required size and lightweight structure for the upwelling generation submarine artificial dam necessary for generating upwelling flow. . In addition, the upwelling submarine artificial dam is easily installed from the ocean to an appropriate location on the ocean floor.

また，上記沈降工程では，湧昇流発生海底人工堤の浮力を利用して，沈降させてもよい。かかる構成により，湧昇流発生海底人工堤の鋼管トラス構造体は，中空空間を有するので，中空空間に空気を残留させながら，海水を注入することができる。その結果，湧昇流発生海底人工堤は，浮力を受けるので，緩やかに海底へ沈降することができる。   Further, in the subsidence process, subsidence may be performed using the buoyancy of the artificial seabed with upwelling flow generation. With such a configuration, the steel pipe truss structure of the artificial seabed with upwelling flow generation has a hollow space, so that seawater can be injected while air remains in the hollow space. As a result, the uplifted seabed artificial levee receives buoyancy and can slowly sink to the seabed.

また，湧昇流発生海底人工堤を設置箇所の洋上に浮遊させる工程より前に，湧昇流発生海底人工堤を構築する工程と；設置箇所の洋上まで湧昇流発生海底人工堤を輸送する工程と；をさらに含んでもよい。かかる構成により，湧昇流発生海底人工堤の鋼管トラス構造体は，中空空間を有するので，鋼管トラス構造体は軽量であり，湧昇流発生海底人工堤の構築及び輸送を容易かつ迅速とすることができる。   In addition, the process of constructing an artificial submarine levee generating upwelling flow before the process of floating the submarine artificial levee generating upwelling on the offshore of the installation site; And a process. With this configuration, the steel truss structure of the seabed artificial levee generating the upwelling current has a hollow space, so the steel truss structure is lightweight, and the construction and transportation of the seabed artificial levee generating the upwelling current is easy and quick. be able to.

また，上記輸送工程は，湧昇流発生海底人工堤を洋上に浮遊させて輸送してもよい。かかる構成において，湧昇流発生海底人工堤は，洋上に浮遊されて輸送される。湧昇流発生海底人工堤の鋼管トラス構造体は，中空空間を有するので，湧昇流発生海底人工堤を海上に浮遊させて輸送することができる。その結果，輸送工程において，台船が不要となるため，輸送コストを削減することができる。   Further, in the transporting process, the artificial seabed with upwelling current generation may be suspended and transported on the ocean. In such a configuration, the upwelling submarine artificial levee is suspended and transported offshore. Since the steel pipe truss structure of the upwelling seabed artificial levee has a hollow space, it is possible to transport the uplifted seabed artificial levee floating on the sea. As a result, since no trolley is required in the transportation process, transportation costs can be reduced.

以上説明したように本発明によれば，湧昇流の発生に必要な構造物を必要最小限の大きさかつ軽量の構造体で構築することができ，洋上から海底の適切な設置箇所に容易に設置することができる。   As described above, according to the present invention, a structure necessary for generating upwelling flow can be constructed with a minimum size and a lightweight structure, and can be easily installed from the ocean to an appropriate location on the seabed. Can be installed.

以下に添付図面を参照しながら，本発明の好適な実施の形態について詳細に説明する。なお，本明細書および図面において，実質的に同一の機能構成を有する構成要素については，同一の符号を付することにより重複説明を省略する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

（第１の実施形態）
まず，本発明の第１の実施形態にかかる湧昇流発生海底人工堤１について説明する。図１は，本発明の第１の実施形態にかかる湧昇流発生海底人工堤１を示す斜視図である。図２は，同実施形態にかかる湧昇流発生海底人工堤１を示す側面図である。図３は，図１のＡ−Ａ線で切断した断面図である。 (First embodiment)
First, the upwelling generation submarine artificial dam 1 according to the first embodiment of the present invention will be described. FIG. 1 is a perspective view showing an upwelling generation submarine artificial dam 1 according to a first embodiment of the present invention. FIG. 2 is a side view showing the upwelling generation submarine artificial dam 1 according to the embodiment. 3 is a cross-sectional view taken along line AA in FIG.

湧昇流発生海底人工堤１は，海底１９０を水平に流れる底層流を遮断し，海底１９０から海面１８０方向へ流れる湧昇流を人工的に発生させる構造物である。湧昇流発生海底人工堤１は，例えば，例えば大陸棚が形成された沖合い約８０ｋｍ，海面１８０からの深さＤ（図７Ｆ参照）が約２００〜３００ｍの海底１９０に設置される。但し，湧昇流発生海底人工堤１の設置場所は，かかる例に限定されず，例えば水深はさらに浅くてもよいし，深くてもよい。   The upwelling generation submarine artificial dam 1 is a structure that interrupts the bottom layer flow that flows horizontally through the seabed 190 and artificially generates the upwelling current that flows from the seabed 190 toward the sea surface 180. The upwelling generation seabed artificial levee 1 is installed, for example, on the seabed 190 of about 80 km offshore where a continental shelf is formed and a depth D (see FIG. 7F) from the sea surface 180 of about 200 to 300 m. However, the installation location of the upwelling generation submarine artificial dam 1 is not limited to such an example, and the water depth may be shallower or deeper, for example.

湧昇流発生海底人工堤１は，底層流の流れの向きを海底１９０から海面１８０方向に転向できる規模を有しており，例えば，湧昇流発生海底人工堤１の長手方向の長さＬ１が例えば約１００〜２００ｍ，奥行き方向の長さＬ２が例えば約２０ｍ〜３０ｍであり，垂直高さＨが例えば２０〜３０ｍである。但し，湧昇流発生海底人工堤１の長さや高さは，かかる例に限定されず，例えば海底１９０の深さや海流の速度，海流の幅などの設計条件に応じて変更してもよい。 The upwelling generation submarine artificial levee 1 has a scale that can change the direction of the flow of the bottom layer flow from the seabed 190 to the sea surface 180. For example, the longitudinal length L of the upwelling generation submarine artificial levee 1 1 is, for example, about 100 to 200 m, the length L 2 in the depth direction is, for example, about 20 m to 30 m, and the vertical height H is, for example, 20 to 30 m. However, the length and height of the upwelling seabed artificial levee 1 are not limited to this example, and may be changed according to design conditions such as the depth of the seabed 190, the speed of the sea current, and the width of the sea current.

上記の湧昇流発生海底人工堤１は，鋼管トラス構造体１００と３枚の遮蔽板１３０とを備える。この鋼管トラス構造体１００は，３本の主鋼管１１０と，主鋼管１１０を連結する連結材１２０とからなる鋼管トラス構造で形成されている。また，３枚の遮蔽板１３０は，鋼管トラス構造体１００の内部に，主鋼管１１０の軸方向に延設されている。   The above-mentioned upwelling submarine artificial dam 1 includes a steel pipe truss structure 100 and three shielding plates 130. The steel pipe truss structure 100 is formed by a steel pipe truss structure including three main steel pipes 110 and a connecting member 120 that connects the main steel pipes 110. Further, the three shielding plates 130 are extended in the axial direction of the main steel pipe 110 inside the steel pipe truss structure 100.

鋼管トラス構造体１００の主鋼管１１０の長さは，上記で説明したとおり，湧昇流発生海底人工堤１全体の長さに応じて定まり，例えば約１００〜２００ｍである。主鋼管１１０の管径は，例えば約２〜３ｍである。主鋼管１１０の肉厚は，例えば約１２〜２０ｍｍである。主鋼管１１０は，中空空間１１９を有した鋼管であり，主鋼管１１０の軸方向の両側端部１１４は，例えば平板状の鋼板などによって，封止されている。なお，主鋼管１１０の外周面は，腐食防止のため電気防食や防食塗装等が施されてもよい。   As described above, the length of the main steel pipe 110 of the steel pipe truss structure 100 is determined according to the overall length of the upwelling seabed artificial levee 1 and is, for example, about 100 to 200 m. The pipe diameter of the main steel pipe 110 is, for example, about 2 to 3 m. The wall thickness of the main steel pipe 110 is, for example, about 12 to 20 mm. The main steel pipe 110 is a steel pipe having a hollow space 119, and both end portions 114 in the axial direction of the main steel pipe 110 are sealed with, for example, a flat steel plate. Note that the outer peripheral surface of the main steel pipe 110 may be subjected to anticorrosion, anticorrosion coating, or the like in order to prevent corrosion.

主鋼管１１０には，排気口１１６，注水口１１７と，格点部１１２が形成される。図１及び図３に示すように，排気口１１６は，例えば主鋼管１１０の横断面の上部に形成され，注水口１１７は，例えば主鋼管１１０の横断面の下部に形成される。また，排気口１１６には，排気制御手段としての排気用バルブ（図示せず）が設けられ，注水口１１７には，注水制御手段としての注水用バルブ（図示せず）が設けられてもよい。   The main steel pipe 110 is formed with an exhaust port 116, a water injection port 117, and a rating part 112. As shown in FIGS. 1 and 3, the exhaust port 116 is formed, for example, in the upper part of the cross section of the main steel pipe 110, and the water injection port 117 is formed, for example, in the lower part of the cross section of the main steel pipe 110. The exhaust port 116 may be provided with an exhaust valve (not shown) as exhaust control means, and the water injection port 117 may be provided with a water injection valve (not shown) as water injection control means. .

主鋼管１１０は，３本の主鋼管１１０が互いに平行するように配設される。このとき，鋼管トラス構造体１００の横断面において，各主鋼管１１０が三角形の頂点に対応する位置に配設される。この三角形は，例えば正三角形とすることができる。   The main steel pipe 110 is disposed so that the three main steel pipes 110 are parallel to each other. At this time, in the cross section of the steel pipe truss structure 100, each main steel pipe 110 is disposed at a position corresponding to the apex of the triangle. This triangle can be, for example, a regular triangle.

上記鋼管トラス構造体１００の連結材１２０は，例えば鋼管を用いることができ，この連結材１２０を成す鋼管の管径は例えば約１ｍである。なお，連結材１２０は，鋼管の例に限定されず，例えば，棒鋼，Ｈ型鋼など任意の鋼材，他の材質の部材または組立部材などであってもよい。連結材１２０は，３本の主鋼管１１０を連結して，鋼管トラス構造体１００の全体の形状を保持する。   For example, a steel pipe can be used as the connecting member 120 of the steel pipe truss structure 100, and the diameter of the steel pipe forming the connecting member 120 is, for example, about 1 m. In addition, the connection material 120 is not limited to the example of a steel pipe, For example, arbitrary steel materials, such as bar steel and H-shaped steel, the member of another material, an assembly member, etc. may be sufficient. The connecting member 120 connects the three main steel pipes 110 and maintains the overall shape of the steel pipe truss structure 100.

複数の連結材１２０は，トラス構造を形成するように，主鋼管１１０と連結される。具体的には，主鋼管１１０の軸方向の端部１１４側で連結される連結材１２０は，例えば，主鋼管１１０の軸方向に対して垂直に連結される。また，主鋼管１１０の軸方向の中間部で連結される連結材１２０は，鋼管トラス構造体１００の外側面内で斜めに配置される。なお，本明細書において，鋼管トラス構造体１００の外側面とは，鋼管トラス構造体１００の外周面であり，２辺が主鋼管１１０からなる略四角形の面をいう。   The plurality of connecting members 120 are connected to the main steel pipe 110 so as to form a truss structure. Specifically, the connecting member 120 connected on the axial end portion 114 side of the main steel pipe 110 is connected perpendicularly to the axial direction of the main steel pipe 110, for example. Further, the connecting member 120 connected at the intermediate portion in the axial direction of the main steel pipe 110 is disposed obliquely within the outer surface of the steel pipe truss structure 100. In the present specification, the outer surface of the steel pipe truss structure 100 is an outer peripheral surface of the steel pipe truss structure 100 and refers to a substantially rectangular surface having two main sides made of the main steel pipe 110.

主鋼管１１０の格点部１１２は，主鋼管１１０の外周面に形成され，主鋼管１１０と連結材１２０とが連結される部分に形成される。格点部１１２は，管の肉厚が格点部１１２以外の部分よりも厚く形成される。例えば，格点部１１２以外の主鋼管１１０の肉厚が１２〜２０ｍｍのとき，格点部１１２の肉厚は３０〜６０ｍｍで形成される。このように格点部１１２の肉厚が厚く形成されることにより，主鋼管１１０は，連結材１２０の軸力によって受ける押し抜きせん断に耐えることができる。   The grading portion 112 of the main steel pipe 110 is formed on the outer peripheral surface of the main steel pipe 110 and is formed at a portion where the main steel pipe 110 and the connecting material 120 are connected. The rating portion 112 is formed so that the thickness of the tube is thicker than the portion other than the rating portion 112. For example, when the thickness of the main steel pipe 110 other than the rating portion 112 is 12 to 20 mm, the thickness of the rating portion 112 is formed to be 30 to 60 mm. By forming the thickness of the grading portion 112 in this way, the main steel pipe 110 can withstand the punching shear received by the axial force of the connecting member 120.

連結材１２０が例えば鋼管である場合，主鋼管１１０と連結材１２０とは，例えば溶接によって連結される。一方，連結材１２０が例えばＨ型鋼である場合，主鋼管１１０と連結材１２０とは，主鋼管１１０に例えばガセットプレート（図示せず。）を設けて，ガセットプレートとＨ型鋼の連結材１２０とを溶接やボルトで接合することによって連結される。   When the connecting material 120 is a steel pipe, for example, the main steel pipe 110 and the connecting material 120 are connected by welding, for example. On the other hand, when the connecting material 120 is, for example, H-shaped steel, the main steel pipe 110 and the connecting material 120 include, for example, a gusset plate (not shown) provided in the main steel pipe 110, Are connected by welding or bolting.

上記遮蔽板１３０は，板厚が例えば１２〜２０ｍｍの平板状の鋼板で形成できる。なお，遮蔽板１３０，鋼板の例に限定されず，例えば樹脂製や布製などとしてもよい。   The shielding plate 130 can be formed of a flat steel plate having a thickness of 12 to 20 mm, for example. In addition, it is not limited to the example of the shielding board 130 and a steel plate, For example, it is good also as a product made from resin or cloth.

遮蔽板１３０は，鋼管トラス構造体１００内部において，鋼管トラス構造体１００の軸方向に延設される。この場合，鋼管トラス構造体１００軸方向の遮蔽板１３０の長さは，任意の長さとすることができる。このとき，複数の遮蔽板１３０を配設することによって，１枚の遮蔽板１３０を施工しやすい長さとすることができるので，湧昇流発生海底人工堤１の構築が容易となる。なお，鋼管トラス構造体１００に複数の遮蔽板１３０を配設することにより，図１に示すように，遮蔽板１３０と遮蔽板１３０との間には，スリット１３４が形成される場合がある。但し，遮蔽板１３０が底層流を遮断する機能が損なわれないように，スリット１３４の間隔は，湧昇流発生海底人工堤１全体の長さＬ１に比べて，短くする必要がある。 The shielding plate 130 extends in the axial direction of the steel pipe truss structure 100 inside the steel pipe truss structure 100. In this case, the length of the shielding plate 130 in the axial direction of the steel pipe truss structure 100 can be set to an arbitrary length. At this time, by arranging the plurality of shielding plates 130, it is possible to make the length of the one shielding plate 130 easy to construct, so that the construction of the upwelling generation seabed artificial levee 1 is facilitated. In addition, by arranging a plurality of shielding plates 130 on the steel pipe truss structure 100, a slit 134 may be formed between the shielding plates 130 as shown in FIG. However, as function of the shielding plate 130 blocks the bottom layer flow is not compromised, the interval of the slits 134, compared to the upwelling occurs seabed artificial dam 1 overall length L 1, it is necessary to shorten.

なお，鋼管トラス構造体１００内部において，遮蔽板１３０を鋼管トラス構造体１００の軸方向に複数枚配設せず，軸方向に一枚の遮蔽板１３０が配設されるとしてもよい。このとき，遮蔽板１３０は，主鋼管１１０の一の端部１１４から他の端部１１４まで，鋼管トラス構造体１００の軸方向に長い１枚の遮蔽板１３０とすることができる。   In the steel pipe truss structure 100, a plurality of shielding plates 130 may not be provided in the axial direction of the steel pipe truss structure 100, but a single shielding plate 130 may be provided in the axial direction. At this time, the shielding plate 130 may be a single shielding plate 130 that is long in the axial direction of the steel pipe truss structure 100 from one end 114 to the other end 114 of the main steel pipe 110.

遮蔽板１３０は，鋼管トラス構造体１００の内部に，相異なる面角度を有して形成される。３枚の遮蔽板１３０ａ〜１３０ｃ（以下，１３０と総称する場合もある）は，図２（ａ）に示すように，接合材１３２を中心として，１２０度の間隔で配設される。かかる３枚の遮蔽板１３０ａ〜１３０ｃの配置は，鋼管トラス構造体１００内部に遮蔽板１３０ａ〜１３０ｃを配して傾斜面を形成する際，最も材料を少なくすることができる配置である。そのため，本実施形態の遮蔽板１３０の配置は，材料費を最も安価にすることができる配置である。   The shielding plate 130 is formed inside the steel pipe truss structure 100 with different surface angles. As shown in FIG. 2A, three shielding plates 130a to 130c (hereinafter sometimes collectively referred to as 130) are arranged at intervals of 120 degrees with the bonding material 132 as the center. The arrangement of the three shielding plates 130a to 130c is an arrangement in which the material can be reduced most when the shielding plates 130a to 130c are disposed inside the steel pipe truss structure 100 to form the inclined surface. Therefore, the arrangement of the shielding plate 130 of the present embodiment is an arrangement that can minimize the material cost.

遮蔽板１３０は，それぞれの遮蔽板１３０ａ〜１３０ｃの一側端部１３６ａが接合材１３２を介して相互に間接的に接合され，それぞれの遮蔽板１３０ａ〜１３０ｃの他側端部１３６ｂが主鋼管１１０と接合される。遮蔽板１３０ａ〜１３０ｃの側端部１３６ａと接合材１３２，及び遮蔽板１３０ａ〜１３０ｃの側端部１３６ｂと主鋼管１１０とは，例えば溶接によって接合される。   In the shielding plate 130, one end portions 136a of the respective shielding plates 130a to 130c are indirectly joined to each other via a bonding material 132, and the other end portions 136b of the respective shielding plates 130a to 130c are joined to the main steel pipe 110. Joined with. The side end portions 136a of the shielding plates 130a to 130c and the joining material 132, and the side end portions 136b of the shielding plates 130a to 130c and the main steel pipe 110 are joined by welding, for example.

接合材１３２は，鋼管トラス構造体１００の軸方向に平行な軸材である。接合材１３２は，例えば鋼管トラス構造体１００の横断面において，３本の主鋼管１１０が形成する三角形の重心を通る。但し，かかる例に限定されず，接合材１３２は三角形の重心以外の位置に配設されてもよい。   The bonding material 132 is a shaft material parallel to the axial direction of the steel pipe truss structure 100. For example, in the cross section of the steel pipe truss structure 100, the bonding material 132 passes through the center of gravity of the triangle formed by the three main steel pipes 110. However, the present invention is not limited to this example, and the bonding material 132 may be disposed at a position other than the triangular center of gravity.

なお，遮蔽板１３０ａ〜１３０ｃの側端部１３６ａの接合は，接合材１３２を介して間接的に接合される例に限定されず，遮蔽板１３０ａ〜１３０ｃの側端部１３６ａ同士が直接接合されてもよい。   The joining of the side end portions 136a of the shielding plates 130a to 130c is not limited to the example of being indirectly joined via the joining material 132, and the side end portions 136a of the shielding plates 130a to 130c are directly joined together. Also good.

上記の遮蔽板１３０は，鋼管トラス構造体１００の内部に配設されているため，底層流によって異物が流れてきた場合でも，鋼管トラス構造体１００の主鋼管１１０や連結材１２０によって防御されるため，破損するおそれが少ない。遮蔽板１３０は，必要に応じて遮蔽板１３０に補強材（図示せず。）を設けて，外力に耐えられるように補強してもよい。   Since the shielding plate 130 is disposed inside the steel pipe truss structure 100, even when foreign matter flows due to the bottom layer flow, the shielding plate 130 is protected by the main steel pipe 110 and the connecting member 120 of the steel pipe truss structure 100. Therefore, there is little risk of damage. The shielding plate 130 may be reinforced to withstand external force by providing a reinforcing material (not shown) on the shielding plate 130 as necessary.

上記で説明したように，鋼管トラス構造体１００は，鋼管トラス構造体１００の主鋼管１１０が中空であるため，浮力によって海面１８０上に浮遊する。また，主鋼管１１０は，注水口１１７を通じて中空空間１１９に海水が注水され，排気口１１６を通じて中空空間１１９の空気が排出される。このとき，湧昇流発生海底人工堤１は，湧昇流発生海底人工堤１及び注水された海水の重力によって海中に沈む。   As described above, the steel pipe truss structure 100 floats on the sea surface 180 due to buoyancy because the main steel pipe 110 of the steel pipe truss structure 100 is hollow. In the main steel pipe 110, seawater is injected into the hollow space 119 through the water injection port 117, and air in the hollow space 119 is discharged through the exhaust port 116. At this time, the upwelling seabed artificial levee 1 sinks into the sea due to the gravity of the upwelling seabed artificial dam 1 and the injected seawater.

注水口１１７及び排気口１１６にそれぞれ設けられた注水用バルブ及び排気口バルブが閉鎖されているとき，主鋼管１１０の中空空間１１９は密閉された状態となり，中空空間１１９に海水が浸入せず，鋼管トラス構造体１００を海面１８０に浮遊させることができる。また，鋼管トラス構造体１００が海面１８０に浮遊した状態で，上記の注水用バルブ及び排気用バルブを開放することによって，注水口１１７から中空空間１１９に海水が注入され，排気口１１６から中空空間１１９の空気が排出されて，鋼管トラス構造体１００を海中に沈降させることができる。   When the water injection valve and the exhaust port valve respectively provided at the water injection port 117 and the exhaust port 116 are closed, the hollow space 119 of the main steel pipe 110 is in a sealed state, and seawater does not enter the hollow space 119, The steel pipe truss structure 100 can be suspended on the sea surface 180. In addition, when the steel pipe truss structure 100 is floated on the sea surface 180, the water injection valve and the exhaust valve are opened, so that seawater is injected from the water injection port 117 into the hollow space 119, and from the exhaust port 116 to the hollow space. 119 air is discharged, and the steel pipe truss structure 100 can be submerged in the sea.

また，上記バルブは，遠隔操作によって開放または閉鎖できるように構成されてもよい。その結果，鋼管トラス構造体１００の注水時に，主鋼管１１０の中空空間１１９に注入する海水量を調整することができる。また，湧昇流発生海底人工堤１の着底時に，中空空間１１９に残留した空気を排出し，中空空間１１９に海水を完全に満たすように注水することができる。   The valve may be configured to be opened or closed by remote control. As a result, the amount of seawater injected into the hollow space 119 of the main steel pipe 110 can be adjusted when the steel pipe truss structure 100 is poured. In addition, when the upwelling seabed artificial levee 1 is settled, the air remaining in the hollow space 119 can be discharged, and water can be poured so that the hollow space 119 is completely filled with seawater.

連結材１２０を中空の鋼管で構成する場合は，連結材１２０に注水口（図示せず。）が設けられてもよい。この注入孔は，湧昇流発生海底人工堤１の沈降時に，連結材１２０の中空空間に海水を注水することができる。連結材１２０に設けられる注入孔は，例えば連結材１２０の側面に形成される。   In the case where the connecting member 120 is constituted by a hollow steel pipe, the connecting member 120 may be provided with a water inlet (not shown). This injection hole can inject seawater into the hollow space of the connecting member 120 when the submarine artificial dam 1 generating the upwelling flow is submerged. The injection hole provided in the connecting material 120 is formed on the side surface of the connecting material 120, for example.

また，主鋼管１１０と連結材１２０がともに鋼管である場合は，相互に連通するように，主鋼管１１０側面に貫通孔（図示せず。）を形成してもよい。このとき，連結材１２０側面に注入孔を設けなくても，主鋼管１１０に設けられた注水口１１７から注入された海水は，当該貫通孔を経由して，連結材１２０の中空空間に注水され，連結材１２０の中空空間に海水を満たすことができる。   Moreover, when both the main steel pipe 110 and the connection material 120 are steel pipes, you may form a through-hole (not shown) in the side surface of the main steel pipe 110 so that it may mutually communicate. At this time, the seawater injected from the water injection port 117 provided in the main steel pipe 110 is injected into the hollow space of the connection material 120 through the through hole without providing the injection hole on the side surface of the connection material 120. , The hollow space of the connecting member 120 can be filled with seawater.

鋼管トラス構造体１００内部に３枚の遮蔽板１３０を配設することにより，図２（ｂ）に示すとおり，３枚の遮蔽板１３０ａ〜１３０ｃのうちの２枚の遮蔽板１３０ｂ，１３０ｃは，海底面１９０に対して約３０度の傾斜面を形成する。また，遮蔽板１３０ａ〜１３０ｃのうちの１枚の遮蔽板１３０ａは，海底面１９０に対してほぼ垂直な面を形成する。   By arranging the three shielding plates 130 inside the steel pipe truss structure 100, as shown in FIG. 2 (b), the two shielding plates 130b and 130c among the three shielding plates 130a to 130c are: An inclined surface of about 30 degrees with respect to the sea bottom 190 is formed. In addition, one of the shielding plates 130 a to 130 c forms a surface that is substantially perpendicular to the sea bottom 190.

その結果，海底面１９０に対して水平方向に流れる底層流は，例えば遮蔽板１３０ｂによって遮断され，海底１９０から海面１８０方向へ流れが転向する。この転向した海流は，遮蔽板１３０ａに沿って垂直方向に流れることで，湧昇流が発生する。   As a result, the bottom layer flow flowing in the horizontal direction with respect to the sea bottom 190 is blocked by, for example, the shielding plate 130b, and the flow is turned from the sea bottom 190 toward the sea surface 180. The diverted ocean current flows in the vertical direction along the shielding plate 130a, thereby generating upwelling current.

また，遮蔽板１３０は，鋼管トラス構造体１００内部で，例えば正三角形の重心を中心として，各主鋼管１１０と接するように放射状に配置されている。その結果，湧昇流発生海底人工堤１が海底１９０に着底した際，鋼管トラス構造体１００の外側面は，どの面が海底面１９０に接地する底面となったしても，３つの遮蔽板１３０ａ〜１３０ｃで形成される傾斜面及び垂直面の配置は同じである。そのため，湧昇流発生海底人工堤１を着底させる工程で，湧昇流発生海底人工堤１の接地面を制御せずに，湧昇流を発生させるための傾斜面及び垂直面を得ることができる。   In addition, the shielding plate 130 is radially arranged inside the steel pipe truss structure 100 so as to be in contact with each main steel pipe 110 around the center of the equilateral triangle, for example. As a result, when the upwelling seabed artificial levee 1 settles on the seabed 190, the outer surface of the steel pipe truss structure 100 has three shields regardless of which surface becomes the bottom surface that contacts the seabed 190. The arrangement of the inclined surface and the vertical surface formed by the plates 130a to 130c is the same. Therefore, it is possible to obtain an inclined surface and a vertical surface for generating the upwelling flow without controlling the ground contact surface of the upwelling generated submarine artificial dam 1 in the process of landing the upwelling generated submarine artificial dam 1. Can do.

上記のとおり，主鋼管１１０と連結材１２０とからなる鋼管トラス構造体１００は，湧昇流の発生に必要な湧昇流発生海底人工堤１を必要最小限の大きさで，軽量の構造体で構築することができる。遮蔽板１３０は，海底１９０を水平に流れている底層流を遮断して，海底１９０から海面１８０方向へ海流の流れ方向を変化させ，湧昇流を発生させる。   As described above, the steel truss structure 100 composed of the main steel pipe 110 and the connecting member 120 is a light-weight structure with the minimum required size of the artificial seabed 1 for generating the upwelling flow necessary for generating the upwelling flow. Can be built with. The shielding plate 130 blocks the bottom layer flow that flows horizontally through the seabed 190, changes the flow direction of the ocean current from the seabed 190 toward the sea surface 180, and generates upwelling flow.

また，鋼管トラス構造体１００が三角柱の構造によって形成されることにより，鋼管トラス構造体１００は，四角柱などの他の多角柱による構造に比べて，外力を受けても回転しにくい安定的な構造を得ることができる。また，同規模の構造物を構築する場合，他の多角柱構造に比べて，使用材料が最も少なくなり，製造コストや施工コストも安価である。   Further, since the steel pipe truss structure 100 is formed of a triangular column structure, the steel pipe truss structure 100 is more stable than the structure of other polygonal columns such as a quadrangular column and is difficult to rotate even when subjected to an external force. A structure can be obtained. In addition, when constructing a structure of the same scale, compared to other polygonal column structures, the materials used are the least, and the manufacturing cost and construction cost are also low.

また，海底に設置された湧昇流発生海底人工堤１の接地面が，鋼管トラス構造体１００の外周面の３面のうちどの１面であっても，遮蔽板１３０によって形成される傾斜面及び垂直面の向きは，同じである。従って，いずれの場合でも，遮蔽板１３０は，海底１９０を水平に流れている底層流を遮断して，海底１９０から海面１８０方向へ海流の流れ方向を転向させるように配置されるので，湧昇流発生海底人工堤１は，湧昇流を発生させることができる。   In addition, the inclined surface formed by the shielding plate 130 is used for any one of the three outer peripheral surfaces of the steel pipe truss structure 100 as the ground contact surface of the upwelling generation artificial seawall 1 installed on the seabed. And the orientation of the vertical plane is the same. Therefore, in any case, the shielding plate 130 is disposed so as to block the bottom layer flow flowing horizontally on the seabed 190 and to turn the direction of the ocean current from the seabed 190 toward the sea surface 180. The flow generating submarine artificial dam 1 can generate upwelling flow.

次に，図４〜図６を参照して，本実施形態にかかる湧昇流発生海底人工堤１の遮蔽板の配置の変更例について説明する。図４〜図６は，それぞれ本実施形態にかかる湧昇流発生海底人工堤１の変更例を示す側面図である。   Next, with reference to FIGS. 4-6, the example of a change of arrangement | positioning of the shielding board of the upwelling generation submarine artificial dam 1 concerning this embodiment is demonstrated. 4-6 is a side view which shows the example of a change of the upwelling generation | occurrence | production seabed artificial dam 1 concerning this embodiment, respectively.

まず，図４に示した本実施形態にかかる湧昇流発生海底人工堤１の遮蔽板２３０ａ〜２３０ｃ（以下，２３０と総称する場合もある）の配置の変更例について説明する。本変更例では，図４（ａ）に示すとおり，遮蔽板２３０は，鋼管トラス構造体１００の外側面の３面全てに配置される。遮蔽板２３０は，鋼管トラス構造体１００の軸方向に延設され，相異なる面角度を有して配設される。さらに，遮蔽板２３０は，連結材１２０に接して設置される。   First, a description will be given of a modified example of the arrangement of the shielding plates 230a to 230c (hereinafter sometimes referred to as 230) of the upwelling generation seabed artificial levee 1 according to the present embodiment shown in FIG. In this modified example, as shown in FIG. 4A, the shielding plate 230 is disposed on all three outer surfaces of the steel pipe truss structure 100. The shielding plate 230 extends in the axial direction of the steel pipe truss structure 100 and is disposed with different surface angles. Further, the shielding plate 230 is installed in contact with the connecting member 120.

図４（ｂ）に示すとおり，３枚の遮蔽板２３０ａ〜２３０ｃのうちの２枚の遮蔽板２３０ａ，２３０ｂは，海底面１９０に対して約６０度の傾斜面を形成する。その結果，海底面１９０に対して水平方向に流れる底層流は，例えば遮蔽板２３０ａによって遮断され，遮蔽板２３０ａに沿って海流が流れることにより，海底１９０から海面１８０方向へ流れる湧昇流が発生する。   As shown in FIG. 4B, the two shielding plates 230 a and 230 b out of the three shielding plates 230 a to 230 c form an inclined surface of about 60 degrees with respect to the sea bottom 190. As a result, the bottom layer flow that flows in the horizontal direction with respect to the sea bottom 190 is blocked by, for example, the shielding plate 230a, and the ocean current flows along the shielding plate 230a, thereby generating the upwelling flow that flows from the sea bottom 190 toward the sea surface 180. To do.

また，遮蔽板２３０ａ〜２３０ｃが鋼管トラス構造体１００の外側面３面に設けられているので，湧昇流発生海底人工堤１が海底１９０に着底した際，どの外側面が海底面１９０に向いたとしても，残りの２面は，約６０度の傾斜面を形成する。そのため，湧昇流発生海底人工堤１を着底させる工程で，湧昇流発生海底人工堤１の接地面を制御せずに，湧昇流を発生させるための傾斜面を得ることができる。   Further, since the shielding plates 230a to 230c are provided on the three outer side surfaces of the steel pipe truss structure 100, when the upwelling generation seabed artificial levee 1 settles on the seabed 190, which outer side surface is on the seabed 190. Even if it faces, the remaining two surfaces form an inclined surface of about 60 degrees. Therefore, it is possible to obtain an inclined surface for generating the upwelling flow without controlling the ground contact surface of the upwelling generated seabed artificial levee 1 in the process of landing the upwelling generated seabed artificial levee 1.

次に，図５に示した本実施形態にかかる湧昇流発生海底人工堤１の変更例について説明する。本変更例では，図５（ａ）に示すとおり，遮蔽板２３０は，鋼管トラス構造体１００の外側面２面に配置される。遮蔽板２３０は，主鋼管１１０の軸方向に延設され，相異なる面角度を有して配設される。さらに，遮蔽板２３０は，連結材１２０に接して設置される。   Next, a modified example of the upwelling generation submarine artificial dam 1 according to the present embodiment shown in FIG. 5 will be described. In this modified example, as shown in FIG. 5A, the shielding plate 230 is disposed on the two outer surfaces of the steel pipe truss structure 100. The shielding plate 230 extends in the axial direction of the main steel pipe 110 and is disposed with different surface angles. Further, the shielding plate 230 is installed in contact with the connecting member 120.

図５（ｂ）に示すとおり，遮蔽板２３０ａ，２３０ｂが設けられていない面が海底面１９０を向いた場合，２枚の遮蔽板２３０ａ，２３０ｂは，海底面１９０に対して約６０度の傾斜面を形成する。その結果，海底面１９０に対して水平方向に流れる底層流は，例えば遮蔽板２３０ａによって遮断され，遮蔽板２３０ａに沿って海流が流れることにより，海底１９０から海面１８０方向へ流れる湧昇流が発生する。   As shown in FIG. 5B, when the surface where the shielding plates 230a and 230b are not provided faces the sea bottom 190, the two shielding plates 230a and 230b are inclined at about 60 degrees with respect to the sea bottom 190. Form a surface. As a result, the bottom layer flow that flows in the horizontal direction with respect to the sea bottom 190 is blocked by, for example, the shielding plate 230a, and the ocean current flows along the shielding plate 230a, thereby generating the upwelling flow that flows from the sea bottom 190 toward the sea surface 180. To do.

図５（ｃ）に示すとおり，鋼管トラス構造体１００の外周面のうち遮蔽板２３０が設けられた面のうちの１面，例えば遮蔽板２３０ａが海底面１９０を向いた底面である場合，残りの遮蔽板２３０ｂは，海底面１９０に対して約６０度の傾斜面を形成する。その結果，海底面１９０に対して水平方向に流れる底層流は，遮蔽板２３０ｂによって遮断され，遮蔽板２３０ｂに沿って海流が流れることにより，海底１９０から海面１８０方向へ流れる湧昇流が発生する。   As shown in FIG. 5C, one of the outer peripheral surfaces of the steel pipe truss structure 100 provided with the shielding plate 230, for example, the shielding plate 230a is a bottom surface facing the sea bottom 190, the remaining The shielding plate 230b forms an inclined surface of about 60 degrees with respect to the sea bottom 190. As a result, the bottom layer flow that flows in the horizontal direction with respect to the sea floor 190 is blocked by the shielding plate 230b, and the ocean current flows along the shielding plate 230b, thereby generating the upwelling flow that flows from the sea bottom 190 toward the sea surface 180. .

以上で説明したように，湧昇流発生海底人工堤１が海底１９０に着底した際，湧昇流発生海底人工堤１が，図５（ｂ），図５（ｃ）に示したどちらの向きで着底したとしても，少なくとも１面は，約６０度の傾斜面を形成する。そのため，湧昇流発生海底人工堤１を着底させる工程で，湧昇流発生海底人工堤１の設置面を制御せずに，湧昇流を発生させるための傾斜面を得ることができる。   As described above, when the upwelling generation submarine artificial dam 1 settles on the seabed 190, the upwelling generation submarine artificial levee 1 is not shown in either of FIGS. 5 (b) and 5 (c). At least one surface forms an inclined surface of about 60 degrees even if it is settled in the direction. Therefore, it is possible to obtain an inclined surface for generating the upwelling flow without controlling the installation surface of the upwelling generated seabed artificial levee 1 in the process of landing the upwelling generated seabed artificial levee 1.

次に，図６に示した本実施形態にかかる湧昇流発生海底人工堤１の変更例について説明する。本変更例では，図６（ａ）に示すとおり，遮蔽板２３０が，鋼管トラス構造体１００の外側面に設置される。遮蔽板３３０は，遮蔽板２３０に対して垂直となるように，主鋼管１１０と遮蔽板２３０との間に設けられる。   Next, a modified example of the upwelling generation submarine artificial dam 1 according to this embodiment shown in FIG. 6 will be described. In this modified example, as shown in FIG. 6A, the shielding plate 230 is installed on the outer surface of the steel pipe truss structure 100. The shielding plate 330 is provided between the main steel pipe 110 and the shielding plate 230 so as to be perpendicular to the shielding plate 230.

遮蔽板３３０は鋼管トラス構造体１００の内部に，遮蔽板２３０は鋼管トラス構造体１００の外周面に形成される。また，遮蔽板３３０，２３０は，主鋼管１１０の軸方向に延設され，相異なる面角度（例えば，９０度）を有して配設される。さらに，遮蔽板２３０は，連結材１２０に接して設置される。   The shielding plate 330 is formed inside the steel pipe truss structure 100, and the shielding plate 230 is formed on the outer peripheral surface of the steel pipe truss structure 100. The shielding plates 330 and 230 extend in the axial direction of the main steel pipe 110 and are disposed with different surface angles (for example, 90 degrees). Further, the shielding plate 230 is installed in contact with the connecting member 120.

図６（ｂ）に示すとおり，かかる構成において，遮蔽板２３０が設けられた面が海底面１９０を向いた場合，遮蔽板３３０は，海底面１９０に対して約９０度の垂直面を形成する。その結果，海底面１９０に対して水平方向に流れる底層流は，遮蔽板３３０によって遮断され，遮蔽板３３０に沿って海流が流れることにより，海底１９０から海面１８０方向へ流れる湧昇流が発生する。   As shown in FIG. 6B, in such a configuration, when the surface on which the shielding plate 230 is provided faces the sea bottom surface 190, the shielding plate 330 forms a vertical surface of about 90 degrees with respect to the sea bottom surface 190. . As a result, the bottom layer flow that flows in the horizontal direction with respect to the sea floor 190 is blocked by the shielding plate 330, and the ocean current flows along the shielding plate 330, thereby generating the upwelling flow that flows from the sea bottom 190 toward the sea surface 180. .

図６（ｃ）に示すとおり，かかる構成において，遮蔽板２３０が設けられていない面が海底面１９０を向いた場合，遮蔽板２３０は，海底面１９０に対して約６０度の傾斜面を形成する。その結果，この場合は，海底面１９０に対して水平方向に流れる底層流は，遮蔽板２３０によって遮断され，遮蔽板２３０に沿って海流が流れることにより，海底１９０から海面１８０方向へ流れる湧昇流が発生する。   As shown in FIG. 6C, in such a configuration, when the surface on which the shielding plate 230 is not provided faces the sea bottom surface 190, the shielding plate 230 forms an inclined surface of about 60 degrees with respect to the sea bottom surface 190. To do. As a result, in this case, the bottom layer flow that flows in the horizontal direction with respect to the bottom surface 190 is interrupted by the shielding plate 230, and the ocean current flows along the shielding plate 230. A flow is generated.

以上で説明したように，湧昇流発生海底人工堤１が海底１９０に着底した際，湧昇流発生海底人工堤１が，図６（ｂ），図６（ｃ）に示したどちらの向きで着底したとしても，約９０度の垂直面または約６０度の傾斜面を形成する。そのため，湧昇流発生海底人工堤１を着底させる工程で，湧昇流発生海底人工堤１の設置面を制御せずに，湧昇流を発生させるための傾斜面を得ることができる。   As described above, when the upwelling generation submarine artificial dam 1 settles on the seabed 190, the upwelling generation submarine artificial levee 1 is not shown in either of FIGS. 6 (b) and 6 (c). Even if it is landed in the direction, a vertical surface of about 90 degrees or an inclined surface of about 60 degrees is formed. Therefore, it is possible to obtain an inclined surface for generating the upwelling flow without controlling the installation surface of the upwelling generated seabed artificial levee 1 in the process of landing the upwelling generated seabed artificial levee 1.

次に，図７Ａ〜図７Ｆを参照して，本発明の第１の実施形態にかかる湧昇流発生海底人工堤１の施工方法について説明する。   Next, with reference to FIG. 7A-FIG. 7F, the construction method of the upwelling generation submarine artificial dam 1 concerning the 1st Embodiment of this invention is demonstrated.

まず，湧昇流発生海底人工堤１を構築する工程について説明する。図７Ａは，本実施形態にかかる鋼管トラス構造体１００の構築状況を示す説明図である。図７Ａに示すように，鋼管トラス構造体１００の構成部品，例えば連結材１２０は，起重機１７０によって吊り上げられ，連結箇所まで輸送される。鋼管トラス構造体１００の構築は，主鋼管１１０と連結材１２０を連結し，遮蔽板１３０を配設することによって行われ，このような鋼管トラス構造体１００の構築は，例えば地上で行われる。   First, the process of constructing the upwelling seabed artificial dam 1 will be described. FIG. 7A is an explanatory diagram showing a construction state of the steel pipe truss structure 100 according to the present embodiment. As shown in FIG. 7A, the components of the steel pipe truss structure 100, such as the connecting material 120, are lifted by the hoist 170 and transported to the connecting location. The construction of the steel pipe truss structure 100 is performed by connecting the main steel pipe 110 and the connecting member 120 and disposing the shielding plate 130. The construction of the steel pipe truss structure 100 is performed on the ground, for example.

従来技術である特許文献１の技術では，湧昇流発生のための構造物は，海底にコンクリートブロックを積載して構成されるため，当該構造物の施工は，洋上から構築箇所にコンクリートブロックを投下する方法で行われた。湧昇流を発生させる程度の大規模な構造物を構築するためには，多数のコンクリートブロックが必要である。また，コンクリートブロックは重量が大きいため，台船で構築箇所の洋上まで運搬することができる量は限定された。そのため，所定の構造物が完成するまで，複数回コンクリートブロックを台船で輸送する必要があり，施工期間が長期にわたる上，施工コストが嵩むという問題があった。   In the technology of Patent Document 1 which is a conventional technology, a structure for generating upwelling flow is constructed by loading concrete blocks on the sea floor. It was done by the method of dropping. In order to construct a large-scale structure that generates upwelling flow, a large number of concrete blocks are required. In addition, because the concrete block is heavy, the amount that can be transported to the offshore of the construction site by a trolley was limited. For this reason, it is necessary to transport the concrete block several times by trolley until a predetermined structure is completed, which causes a problem that the construction period is long and the construction cost increases.

これに対し，本実施形態では，鋼管トラス構造体１００は，比較的少ない構成部品数からなるため，施工期間を短縮することができる。また，本実施形態にかかる湧昇流発生海底人工堤１は，完成品に至るまで地上で構築され，当該完成品の湧昇流発生海底人工堤１を設置箇所まで輸送するため，輸送は１回で済ませることができる。また，本実施形態にかかる湧昇流発生海底人工堤１の施工方法は，洋上での作業期間に比べて地上での作業期間が長いため，安全性が高い。   On the other hand, in this embodiment, since the steel pipe truss structure body 100 is composed of a relatively small number of components, the construction period can be shortened. Further, the upwelling generation submarine artificial dam 1 according to the present embodiment is constructed on the ground up to the finished product, and the completed upwelling generation submarine artificial levee 1 is transported to the installation location. Can be done in a single time. Moreover, the construction method of the upwelling seabed artificial levee 1 according to the present embodiment has a high safety because the work period on the ground is longer than the work period on the ocean.

なお，鋼管トラス構造体１００の構築は，ユニット単位で行ってもよい。例えば，鋼管トラス構造体１００を軸方向の所定の長さで等分したユニットごとに区切り，それぞれのユニットをまず構築する。この場合，各ユニットを構築後，それぞれのユニットを結合して，完成品の鋼管トラス構造体１００を構築する。   The construction of the steel pipe truss structure 100 may be performed on a unit basis. For example, the steel pipe truss structure 100 is divided into units equally divided by a predetermined length in the axial direction, and each unit is first constructed. In this case, after each unit is constructed, the respective units are coupled to construct a finished steel pipe truss structure 100.

次に，湧昇流発生海底人工堤１を設置箇所の洋上まで輸送する工程を説明する。図７Ｂは，本実施形態にかかる湧昇流発生海底人工堤１の輸送状況を示す説明図である。   Next, the process of transporting the upwelling submarine artificial dam 1 to the offshore of the installation location will be described. FIG. 7B is an explanatory diagram showing a transport situation of the upwelling generation submarine artificial dam 1 according to the present embodiment.

図７Ｂに示すように，地上で構築された完成品の湧昇流発生海底人工堤１は，例えば台船によって洋上を輸送される。具体的には，湧昇流発生海底人工堤１は台船１５０に積載され，タグボート１６０によって牽引される。台船輸送は，湧昇流発生海底人工堤１の積載地から設置場所まで長距離である場合に適している。湧昇流発生海底人工堤１は，全長が例えば１００ｍ〜２００ｍであるが，主鋼管１１０や鋼管の連結材１２０は中空であるため，同規模の構造物をコンクリートや中実の鋼製部品によって構築したときよりも，軽量であるため，輸送工程は容易かつ迅速となる。   As shown in FIG. 7B, the finished upwelling submarine artificial dam 1 constructed on the ground is transported offshore by, for example, a trolley. Specifically, the upwelling generation submarine artificial dam 1 is loaded on a trolley 150 and pulled by a tugboat 160. The carrier transportation is suitable for a long distance from the loading place of the submarine artificial dam 1 where the upwelling flow is generated to the installation place. The upwelling generation submarine artificial dam 1 has a total length of, for example, 100 m to 200 m. However, since the main steel pipe 110 and the steel pipe connecting material 120 are hollow, a structure of the same scale is made of concrete or solid steel parts. Because it is lighter than when constructed, the transportation process is easier and faster.

次に，湧昇流発生海底人工堤１を設置箇所の洋上に浮遊させる工程について説明する。図７Ｃは，本実施形態にかかる湧昇流発生海底人工堤１の設置現場の到着状況を示す説明図である。   Next, the process of floating the upwelling generation submarine artificial dam 1 on the installation site will be described. FIG. 7C is an explanatory diagram showing an arrival situation at the installation site of the upwelling generation submarine artificial dam 1 according to the present embodiment.

図７Ｃに示すように，設置箇所の洋上に到着した湧昇流発生海底人工堤１は，例えばシンキングバージによって，設置箇所の洋上に浮遊させる。具体的には，まず，台船１５０に海水を注水し，台船１５０を沈降させていく。台船１５０は，海水が注水されるにつれて，重さが増すため，浮遊状態から徐々に海中へと沈降する。次に，台船１５０は，湧昇流発生海底人工堤１と離れて沈降していく。このとき，湧昇流発生海底人工堤１は，注水口１１７及び排気口１１６が閉鎖された状態となっているので，洋上に浮遊する状態となる。その後，台船１５０は，タグボート１６０によって牽引され，湧昇流発生海底人工堤１下部から離隔される。   As shown in FIG. 7C, the upwelling generation submarine artificial dam 1 that has arrived on the ocean at the installation site is floated on the ocean at the installation site, for example, by a sinking barge. Specifically, first, seawater is poured into the trolley 150 to sink the trolley 150. Since the weight of the trolley 150 increases as the seawater is injected, the trolley 150 gradually sinks from the floating state into the sea. Next, the trolley 150 separates from the seabed artificial dam 1 where the upwelling flow is generated. At this time, the upwelling seabed artificial levee 1 is in a state of floating on the ocean because the water injection port 117 and the exhaust port 116 are closed. Thereafter, the trolley 150 is pulled by the tugboat 160 and separated from the lower part of the submarine artificial dam 1 where the upwelling flow is generated.

洋上に浮遊された湧昇流発生海底人工堤１は，注水口１１７及び排気口１１６を閉鎖させており，主鋼管１１０の中空空間１１９には，空気が存在している。従って，湧昇流発生海底人工堤１は，湧昇流発生海底人工堤１の自重による重力と浮力との均衡によって，洋上で浮遊する（図７Ｄ参照）。   The upwelling seabed artificial levee 1 floating on the ocean has closed the water injection port 117 and the exhaust port 116, and air exists in the hollow space 119 of the main steel pipe 110. Therefore, the upwelling seabed artificial levee 1 floats on the ocean due to the balance between gravity and buoyancy due to its own weight (see FIG. 7D).

次に，湧昇流発生海底人工堤１の主鋼管１１０の中空空間１１９に海水を注水する工程について説明する。図７Ｄは，同実施形態にかかる湧昇流発生海底人工堤１の注水状況を示す説明図である。   Next, a process of pouring seawater into the hollow space 119 of the main steel pipe 110 of the upwelling seabed artificial dam 1 will be described. FIG. 7D is an explanatory diagram showing a water injection situation of the upwelling generation seabed artificial dam 1 according to the embodiment.

図７Ｄに示すように，鋼管トラス構造体１００内部の中空空間（主鋼管１１０の中空空間１１９と，連結材１２０の中空空間をいう）に海水を注水する。具体的には，主鋼管１１０の注水口１１７に設けられた注水用バルブと，排気口１１６に設けられた排気用バルブを開放する。このとき，注水口１１７から鋼管トラス構造体１００内部の中空空間に注水される海水量を，注水用バルブ及び排気用バルブによって調整する。かかる調整によって，鋼管トラス構造体１００内部の中空空間に海水が急速に注水されることを防止できる。   As shown in FIG. 7D, seawater is poured into the hollow space inside the steel pipe truss structure 100 (referring to the hollow space 119 of the main steel pipe 110 and the hollow space of the connecting member 120). Specifically, the water injection valve provided at the water injection port 117 of the main steel pipe 110 and the exhaust valve provided at the exhaust port 116 are opened. At this time, the amount of seawater injected from the water injection port 117 into the hollow space inside the steel pipe truss structure 100 is adjusted by the water injection valve and the exhaust valve. By such adjustment, seawater can be prevented from being rapidly poured into the hollow space inside the steel pipe truss structure 100.

次に，湧昇流発生海底人工堤１の設置箇所に湧昇流発生海底人工堤１を沈降させる工程について説明する。図７Ｅは，同実施形態にかかる湧昇流発生海底人工堤１の沈降状況を示す説明図である。   Next, the process of sinking the upwelling seabed artificial dam 1 at the place where the upwelling seabed artificial dam 1 is installed will be described. FIG. 7E is an explanatory diagram showing a subsidence state of the upwelling generation artificial seabed 1 according to the embodiment.

図７Ｅに示すように，注水され始めた湧昇流発生海底人工堤１は，湧昇流発生海底人工堤１及び海水の自重によって，湧昇流発生海底人工堤１にかかる浮力を受けながら，海底１９０に沈降していく。湧昇流発生海底人工堤１の沈降速度は，当該重力と浮力の均衡によって決定される。従って，注水口１１７及び排気口１１６それぞれに設けられた注水用バルブ及び排気用バルブの開閉によって，鋼管トラス構造体１００内部の中空空間に注水される海水量を調整する。注入される海水量の調整は，中空空間に空気が残留するようにして，湧昇流発生海底人工堤１が急速に沈降せず，徐々に海底１９０の設置箇所へ沈降するように制御する。   As shown in FIG. 7E, the upwelling generation submarine artificial dam 1 that has begun to receive water is subjected to the buoyancy applied to the upwelling generation submarine artificial dam 1 by the weight of the upwelling generation submarine artificial dam 1 and the seawater. It sinks to the seabed 190. The subsidence speed of upwelling seabed artificial levee 1 is determined by the balance between gravity and buoyancy. Therefore, the amount of seawater injected into the hollow space inside the steel pipe truss structure 100 is adjusted by opening and closing the water injection valve and the exhaust valve provided at the water injection port 117 and the exhaust port 116, respectively. The adjustment of the amount of injected seawater is controlled so that air remains in the hollow space so that the upwelling seabed artificial levee 1 does not sink rapidly but gradually sinks to the place where the seabed 190 is installed.

次に，湧昇流発生海底人工堤１を設置箇所に着底させる工程について説明する。図７Ｆは，同実施形態にかかる湧昇流発生海底人工堤１の着底状況を示す説明図である。   Next, the process of landing the upwelling generation submarine artificial dam 1 at the installation location will be described. FIG. 7F is an explanatory diagram showing a landing state of the upwelling generation seabed artificial dam 1 according to the embodiment.

湧昇流発生海底人工堤１の着底時の速度は，湧昇流発生海底人工堤１に衝撃を与えず，破損しないような速度とする。湧昇流発生海底人工堤１の設置は，効率よく湧昇流を発生させるように，湧昇流発生海底人工堤１の長手方向を，海底１９０を水平に流れる底層流の向きに対して，ほぼ垂直の向きとする。   The speed at the time of landing of the upwelling seabed artificial levee 1 is set so as not to damage and damage the upwelling seabed artificial dam 1. Installation of the upwelling artificial submarine levee 1 is to set the longitudinal direction of the upwelling artificial submarine levee 1 to the direction of the bottom layer flow that flows horizontally through the submarine 190 so as to generate the upwelling flow efficiently. The direction is almost vertical.

湧昇流発生海底人工堤１の着底後は，注水口１１７に設けられた注水用バルブ及び排気口１１６に設けられた排気用バルブを，例えば遠隔操作によって開放し，鋼管トラス構造体１００内部の中空空間に残留した空気を全て排出する。その結果，中空空間全てに海水が満たされるので，湧昇流発生海底人工堤１及び中空空間に注水された海水の重力によって，湧昇流発生海底人工堤１が海底１９０で滑動することを防止できる。   After the bottom-floor artificial levee 1 has settled, the water injection valve provided at the water injection port 117 and the exhaust valve provided at the exhaust port 116 are opened, for example, by remote operation, so that the inside of the steel pipe truss structure 100 All air remaining in the hollow space is discharged. As a result, since all the hollow space is filled with seawater, it is prevented that the artificial seabed 1 generated by the upwelling flow and the seawater injected into the hollow space 1 slide on the seabed 190 due to the gravity of the seawater injected into the hollow space. it can.

次に，図８Ａ〜図８Ｃを参照して，本実施形態にかかる湧昇流発生海底人工堤１の施工方法の変更例について説明する。なお，図７Ａ〜図７Ｆを参照して説明した湧昇流発生海底人工堤１の施工方法とは，輸送工程，浮遊工程が異なるが，他の工程は同じであるため，詳細な説明は省略する。   Next, with reference to FIG. 8A-FIG. 8C, the example of a change of the construction method of the upwelling generation submarine artificial dam 1 concerning this embodiment is demonstrated. In addition, although the transportation process and the floating process are different from the construction method of the upwelling generation submarine artificial dam 1 described with reference to FIGS. 7A to 7F, the other processes are the same, and the detailed description is omitted. To do.

まず，湧昇流発生海底人工堤１を設置箇所の洋上まで，湧昇流発生海底人工堤１を輸送する工程を説明する。図８Ａは，同実施形態にかかる湧昇流発生海底人工堤１の輸送状況の変更例を示す説明図である。   First, the process of transporting the upwelling seabed artificial levee 1 to the offshore of the installation site will be described. FIG. 8A is an explanatory diagram showing a modification example of the transport status of the upwelling generation seabed artificial levee 1 according to the embodiment.

図８Ａに示すように，本変更例において，地上で構築された完成形の湧昇流発生海底人工堤１は，浮遊曳航によって輸送される。具体的には，湧昇流発生海底人工堤１は，洋上に浮遊された状態でタグボート１６０によって牽引される。湧昇流発生海底人工堤１は，主鋼管１１０や鋼管の連結材１２０が中空であるため，主鋼管１１０の注水口１１７に設けられた注水用バルブ及び排気口１１６に設けられた排気用バルブを閉鎖し，主鋼管１１０の中空空間１１９に空気が存在する状態とすることにより，湧昇流発生海底人工堤１を洋上に浮遊させることができる。   As shown in FIG. 8A, in this modified example, the completed upwelling generation submarine artificial dam 1 constructed on the ground is transported by floating towing. Specifically, the upwelling generation submarine artificial dam 1 is pulled by the tugboat 160 in a state of floating on the ocean. Since the main steel pipe 110 and the connecting material 120 of the steel pipe are hollow in the upwelling seabed artificial levee 1, a water injection valve provided at the water injection port 117 of the main steel pipe 110 and an exhaust valve provided at the exhaust port 116. Is closed, and air is present in the hollow space 119 of the main steel pipe 110, so that the upwelling generation seabed artificial levee 1 can be suspended on the ocean.

また，湧昇流発生海底人工堤１は，同規模の構造物をコンクリートや中実の鋼製部品によって構築するときよりも，軽量である。そのため，湧昇流発生海底人工堤１は，洋上に浮遊させることができるため，浮遊曳航が可能となる。浮遊曳航は，台船が不要となるため，輸送コストを低減させることができる。   Also, the upwelling submarine artificial dam 1 is lighter than when a structure of the same scale is constructed with concrete or solid steel parts. For this reason, the upwelling seabed artificial levee 1 can be suspended on the ocean, and floating towing becomes possible. Floating towing eliminates the need for a trolley and can reduce transportation costs.

次に，湧昇流発生海底人工堤１を設置箇所の洋上に浮遊させる工程について説明する。図８Ｂは，同実施形態にかかる湧昇流発生海底人工堤１の設置現場の到着状況の変更例を示す説明図である。   Next, the process of floating the upwelling generation submarine artificial dam 1 on the installation site will be described. FIG. 8B is an explanatory diagram showing a modification example of the arrival status of the installation site of the upwelling generation artificial seabed 1 according to the embodiment.

上記浮遊曳航は，図７Ｂのような湧昇流発生海底人工堤１を積載する台船１５０を必要としないため，湧昇流発生海底人工堤１を台船１５０から洋上に下ろす作業が省略できる。図８Ｂに示すように，湧昇流発生海底人工堤１の設置箇所の洋上で，湧昇流発生海底人工堤１とタグボート１６０との係留を解除することによって，湧昇流発生海底人工堤１は設置箇所の洋上に浮遊させられる。注水口１１７に設けられた注水用バルブ及び排気口１１６に設けられた排気用バルブを閉鎖させており，鋼管トラス構造体１００内部の中空空間は空気が存在していることから，湧昇流発生海底人工堤１は，洋上で浮遊する。   The floating towing does not require the pontoon 150 for loading the upwelling generation submarine artificial dam 1 as shown in FIG. 7B, so that the work of lowering the upwelling generation submarine artificial levee 1 from the trolley 150 to the ocean can be omitted. . As shown in FIG. 8B, by releasing the mooring between the upwelling generation submarine artificial levee 1 and the tugboat 160 on the ocean where the upwelling generation submarine artificial levee 1 is installed, Is suspended on the ocean where it is installed. Since the water injection valve provided in the water injection port 117 and the exhaust valve provided in the exhaust port 116 are closed, and air exists in the hollow space inside the steel pipe truss structure 100, the upwelling flow is generated. Submarine artificial levee 1 floats on the ocean.

図８Ｃは，同実施形態にかかる湧昇流発生海底人工堤１の注水状況の変更例を示す説明図である。注水口１１７及び排気口１１６にそれぞれ設けられた注水用バルブ及び排気用バルブを開放することにより，鋼管トラス構造体１００内部の中空空間に海水を注水する。注水工程は，図７Ｄを参照して説明した上記注水工程と同様にして行うため，詳細な説明は省略する。   FIG. 8C is an explanatory diagram illustrating a modification example of the water injection state of the upwelling generation seabed artificial dam 1 according to the embodiment. Seawater is injected into the hollow space inside the steel pipe truss structure 100 by opening the water injection valve and the air exhaust valve respectively provided at the water injection port 117 and the exhaust port 116. Since the water injection process is performed in the same manner as the water injection process described with reference to FIG. 7D, detailed description thereof is omitted.

次に，図９を参照して，本実施形態にかかる湧昇流発生海底人工堤１の施工方法の沈降工程の変更例について説明する。図９は，同実施形態にかかる湧昇流発生海底人工堤１の沈降状況の変更例を示す説明図である。   Next, with reference to FIG. 9, the example of a change of the subsidence process of the construction method of the upwelling generation submarine artificial dam 1 concerning this embodiment is demonstrated. FIG. 9 is an explanatory view showing a modification example of the subsidence state of the upwelling generation artificial seabed 1 according to the embodiment.

上記の沈降工程の説明では，湧昇流発生海底人工堤１を沈降させる際，湧昇流発生海底人工堤１を介錯せず，そのまま沈降させる場合を説明した。本変更例では，ワイヤ２７０による介錯をしながら，湧昇流発生海底人工堤１を沈降させる。具体的には，例えば，ワイヤ２７０は，湧昇流発生海底人工堤１を介錯するため，台船２５０とタグボート２６０とに係留される。ワイヤ２７０の長さの調整は，台船２５０上のウインチ２５２で行う。   In the description of the subsidence process described above, the case where the upwelling generation submarine artificial dam 1 is submerged without being intervened in the upwelling generation submarine artificial dam 1 is described. In this modified example, the submarine artificial dam 1 generating the upwelling current is submerged while being interleaved by the wire 270. Specifically, for example, the wire 270 is moored to the trolley 250 and the tugboat 260 in order to intervene the upwelling generation seabed artificial levee 1. The length of the wire 270 is adjusted by the winch 252 on the carriage 250.

これにより，湧昇流発生海底人工堤１は，ワイヤ２７０によって拘束されるので，湧昇流発生海底人工堤１を，正確な向きに設置することができる。なお，湧昇流発生海底人工堤１は，鋼管トラス構造体１００内部の中空空間に空気を残留させて，重力と浮力との均衡によって，緩やかな速度で沈降させることができる。そのため，湧昇流発生海底人工堤１の沈降工程は，大型の起重機船を使用することなく，ウインチなどを使用する簡易な方法で行うことができる利点を有する。   As a result, the upwelling generation submarine artificial dam 1 is restrained by the wire 270, so that the upwelling generation submarine artificial levee 1 can be installed in an accurate orientation. The upwelling submarine artificial dam 1 can be allowed to sink at a moderate speed by allowing air to remain in the hollow space inside the steel truss structure 100 and balancing the gravity and buoyancy. Therefore, the subsidence process of the upwelling generation submarine artificial dam 1 has an advantage that it can be performed by a simple method using a winch or the like without using a large hoist ship.

（第２の実施形態）
次に，図１０を参照して，本発明の第２の実施形態にかかる湧昇流発生海底人工堤２について説明する。図１０は，本発明の第２の実施形態にかかる湧昇流発生海底人工堤２を示す斜視図である。なお，湧昇流発生海底人工堤２は，上記湧昇流発生海底人工堤１と比べて，鋼管トラス構造体１００の機能構成は同じであるため，その機能構成についての詳細な説明は省略する。 (Second Embodiment)
Next, with reference to FIG. 10, the upwelling generation submarine artificial dam 2 according to the second embodiment of the present invention will be described. FIG. 10 is a perspective view showing the upwelling generation submarine artificial dam 2 according to the second embodiment of the present invention. In addition, since the functional structure of the steel pipe truss structure 100 is the same in the upwelling generation submarine artificial dam 2 as compared with the upwelling generation submarine artificial levee 1, detailed description of the functional configuration is omitted. .

本実施形態にかかる湧昇流発生海底人工堤２は，例えば，図１０に示すとおり３つの鋼管トラス構造体１００から構成される。３つの鋼管トラス構造体１００は，それぞれ異なる３方向を向くように形成されており，例えば中心材２１０を中心として１２０°ずつの間隔で相互に接続されている。１つの鋼管トラス構造体１００の長さＬ３は，例えば，３つの鋼管トラス構造体１００の総長が２００ｍとなるように，６７ｍとすることができる。 The upwelling generation seabed artificial levee 2 according to the present embodiment is composed of, for example, three steel pipe truss structures 100 as shown in FIG. The three steel pipe truss structures 100 are formed so as to face three different directions, and are connected to each other at intervals of 120 ° with the center member 210 as the center, for example. The length L 3 of one steel truss structure 100, for example, as the total length of three steel truss structure 100 is 200 meters, it can be 67m.

湧昇流発生海底人工堤２において，鋼管トラス構造体１００は，鋼管トラス構造体１００の軸方向の端部１０２が相互に接合されている。なお，鋼管トラス構造体１００は，端部１０２が中心材２１０に接合することにより，中心材２１０を介して間接的に相互に接合されてもよい。   In the upwelling seabed artificial levee 2, the steel pipe truss structure 100 is joined to the ends 102 in the axial direction of the steel pipe truss structure 100. Note that the steel pipe truss structure 100 may be indirectly joined to each other via the central member 210 by joining the end portion 102 to the central member 210.

中心材２１０には，海面１８０側上部に設置された３本の主鋼管１１０が接合されている。また，中心材２１０は，海底１９０に接地しており，海底１９０から垂直方向に延設される。かかる構成において，中心材２１０は，海面１８０側上部に設置された３本の主鋼管１１０を支持することができ，中心材２１０が設けられないときに比べて，湧昇流発生海底人工堤２全体の強度を高めることができる。   Three main steel pipes 110 installed at the upper part on the sea surface 180 side are joined to the central member 210. The central member 210 is in contact with the seabed 190 and extends from the seabed 190 in the vertical direction. In such a configuration, the central member 210 can support the three main steel pipes 110 installed at the upper part on the sea surface 180 side, and compared to the case where the central member 210 is not provided, the upwelling generation submarine artificial dam 2 is provided. The overall strength can be increased.

本実施形態において，遮蔽板１３０は，海底１９０で水平方向に流れる底層流を遮断し，湧昇流を発生させる。上述した本発明の第１の実施形態にかかる湧昇流発生海底人工堤１のような直線構造では，底層流を確実に遮断できるように，沈降時または着底時に設置方向の調整が必要である。一方，本実施形態にかかる湧昇流発生海底人工堤２では，遮蔽板１３０が３方向に向いているため，どの方向に設置されても底層流を遮断することができる。そのため，本実施形態にかかる湧昇流発生海底人工堤２の施工方法では，沈降工程や着底工程における湧昇流発生海底人工堤２の設置方向の調整を省略することができ，湧昇流発生海底人工堤２の施工が容易となる。   In the present embodiment, the shielding plate 130 blocks the bottom layer flow flowing in the horizontal direction on the seabed 190 and generates the upwelling flow. In the above-described linear structure like the upwelling generation submarine artificial dam 1 according to the first embodiment of the present invention, the installation direction needs to be adjusted at the time of subsidence or landing so that the bottom layer flow can be reliably interrupted. is there. On the other hand, in the upwelling seabed artificial levee 2 according to the present embodiment, the shielding plate 130 faces three directions, so that the bottom layer flow can be interrupted regardless of which direction it is installed. Therefore, in the construction method of the upwelling generation seabed artificial levee 2 according to the present embodiment, adjustment of the installation direction of the upwelling generation seabed artificial dam 2 in the subsidence and landing processes can be omitted, and the upwelling flow Construction of the generated seabed artificial levee 2 becomes easy.

また，本実施形態にかかる湧昇流発生海底人工堤２は，遮蔽板１３０が１２０°の間隔で３方向に向いているため，海底１９０を流れる底層流の向きが変わっても，適切に湧昇流を発生させることができる。   Moreover, since the shield plate 130 is directed in three directions at intervals of 120 °, the artificial seabed 2 with the upwelling flow according to the present embodiment is appropriately springed even if the direction of the bottom current flowing through the seabed 190 changes. Ascending current can be generated.

なお，本実施形態では，湧昇流発生海底人工堤２を構成する鋼管トラス構造体１００の設置数は３つとしたが，これに限定されず，４つ以上としてもよい。例えば，鋼管トラス構造体１００を４つとした場合，鋼管トラス構造体１００は，中心材２１０を中心として，例えば９０°ずつの間隔で相互に接続される。   In the present embodiment, the number of steel pipe truss structures 100 constituting the upwelling generation seabed artificial levee 2 is three, but is not limited to this, and may be four or more. For example, when the number of steel pipe truss structures 100 is four, the steel pipe truss structures 100 are connected to each other at intervals of, for example, 90 ° with the center member 210 as the center.

以上，添付図面を参照しながら本発明の好適な実施形態について説明したが，本発明はかかる例に限定されないことは言うまでもない。当業者であれば，特許請求の範囲に記載された範疇内において，各種の変更例または修正例に想到し得ることは明らかであり，それらについても当然に本発明の技術的範囲に属するものと了解される。   As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

例えば，上述した実施形態においては，本実施形態にかかる湧昇流発生海底人工堤１の主鋼管１１０は，両方の端部１１４が封止されることによって，密閉された中空空間１１９が形成される場合について説明した。しかし，図１１に示すように，主鋼管１１０内部において，密閉された中空空間１１９に隔壁１１８が設けられてもよい。隔壁１１８は，例えば，湧昇流発生海底人工堤１全体のバランスを考慮して，主鋼管１１０の中空空間１１９に，例えば約１０ｍ〜２０ｍの間隔で設置される。このように隔壁１１８を設けることによって，密閉された中空空間１１９が複数形成される。この場合，注水口１１７及び排気口１１６は，隔壁１１８で区切られたそれぞれの密閉された中空空間１１９ごとに，それぞれ少なくとも１箇所ずつ形成される。   For example, in the above-described embodiment, the main steel pipe 110 of the upwelling generation submarine artificial dam 1 according to the present embodiment forms a sealed hollow space 119 by sealing both ends 114. Explained the case. However, as shown in FIG. 11, a partition wall 118 may be provided in a sealed hollow space 119 inside the main steel pipe 110. The partition wall 118 is installed in the hollow space 119 of the main steel pipe 110 at an interval of, for example, about 10 m to 20 m in consideration of, for example, the balance of the upwelling seabed artificial levee 1 as a whole. By providing the partition wall 118 in this way, a plurality of sealed hollow spaces 119 are formed. In this case, the water injection port 117 and the exhaust port 116 are formed at least one place for each sealed hollow space 119 separated by the partition wall 118.

かかる構成により，本実施形態にかかる湧昇流発生海底人工堤１の施工方法の沈降工程において，主鋼管１１０の中空空間１１９に海水を注入する場合，それぞれの中空空間１１９ごとに設けられたバルブの開閉を調整することができる。そのため，注水する空間と注水しない空間とに分けることができ，隔壁１１８を設けない場合と比べて，注水された海水が主鋼管１１０の中空空間１１９で一方に偏ることを防止できる。その結果，湧昇流発生海底人工堤１を沈降させる際，湧昇流発生海底人工堤１を傾斜させることなく，鋼管トラス構造体１００の長手方向のバランスを維持させて，水平に沈降させることができる。   With this configuration, when seawater is injected into the hollow space 119 of the main steel pipe 110 in the subsidence process of the construction method of the upwelling seabed artificial levee 1 according to the present embodiment, a valve provided for each hollow space 119. Can be adjusted. Therefore, it can be divided into a space where water is poured and a space where water is not poured, and the injected seawater can be prevented from being biased to one side in the hollow space 119 of the main steel pipe 110 as compared with the case where the partition wall 118 is not provided. As a result, when substituting the upwelling seabed artificial levee 1, the longitudinal balance of the steel pipe truss structure 100 is maintained without causing the upwelling seabed artificial levee 1 to be tilted and horizontally subsidized. Can do.

また，湧昇流発生海底人工堤１を地上で構築する際，湧昇流発生海底人工堤１は，隔壁で区切られたユニットごとに構築してもよい。この場合，各ユニットを構築後，それぞれのユニットを結合して，湧昇流発生海底人工堤１を完成させることができる。   Further, when the upwelling generation submarine artificial dam 1 is constructed on the ground, the upwelling generation submarine artificial levee 1 may be constructed for each unit separated by a partition wall. In this case, after the units are constructed, the units can be combined to complete the upwelling seabed artificial levee 1.

また，例えば，図１２に示すように，本変更例では，主鋼管１１０に衝撃緩衝材２１２が形成される。衝撃緩衝材２１２は，例えばゴム製とすることができる。かかる構成において，衝撃緩衝材２１２は，湧昇流発生海底人工堤１の着底時における衝撃を緩衝することできるので，着底時に湧昇流発生海底人工堤１が破損することを防止できる。   Further, for example, as shown in FIG. 12, in this modified example, an impact buffer material 212 is formed on the main steel pipe 110. The shock absorbing material 212 can be made of rubber, for example. In such a configuration, the impact buffering material 212 can buffer the impact when the upwelling generation seabed artificial levee 1 is landed, so that the upwelling flow generation seabed artificial dam 1 can be prevented from being damaged at the time of landing.

また，例えば，上述した実施形態においては，湧昇流発生海底人工堤１，２は，海底１９０に１つだけ設置する場合について説明したが，近接する箇所に複数設置してもよい。例えば，湧昇流発生海底人工堤１の長手方向の長さＬ１を１００ｍとし，湧昇流発生海底人工堤１を長手方向に２つ並置することによって，全長２００ｍの湧昇流発生海底人工堤を構成することができる。また，湧昇流発生海底人工堤１，２を複数設置する場合，湧昇流発生海底人工堤１，２の設置方向が相異なるように設置してもよい。 Further, for example, in the above-described embodiment, the case where only one upwelling seabed artificial levee 1 and 2 is installed on the seabed 190 is described, but a plurality of them may be installed in close proximity. For example, the longitudinal length L 1 of the upwelling occurrence seabed artificial dam 1 and 100 m, by juxtaposing two upwelling occurrence seabed artificial dam 1 in the longitudinal direction, upwelling occurrence seabed artificial full-length 200m A dyke can be constructed. Moreover, when installing a plurality of upwelling generation submarine artificial dams 1 and 2, the installation directions of the upwelling generation submarine artificial dams 1 and 2 may be installed differently.

本発明の第１の実施形態にかかる湧昇流発生海底人工堤１を示す斜視図である。It is a perspective view which shows the upwelling generation | occurrence | production seabed artificial dam 1 concerning the 1st Embodiment of this invention. 同実施形態にかかる湧昇流発生海底人工堤１を示す側面図である。It is a side view which shows the upwelling generation submarine artificial dam 1 concerning the embodiment. 図１のＡ−Ａ線で切断した断面図である。It is sectional drawing cut | disconnected by the AA line of FIG. 同実施形態にかかる湧昇流発生海底人工堤１の変更例を示す側面図である。It is a side view which shows the example of a change of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の変更例を示す側面図である。It is a side view which shows the example of a change of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の変更例を示す側面図である。It is a side view which shows the example of a change of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる鋼管トラス構造体１００の構築状況を示す説明図である。It is explanatory drawing which shows the construction condition of the steel pipe truss structure body 100 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の輸送状況を示す説明図である。It is explanatory drawing which shows the transport condition of the upwelling generation | occurrence | production seabed artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の設置現場の到着状況を示す説明図である。It is explanatory drawing which shows the arrival condition of the installation site of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の注水状況を示す説明図である。It is explanatory drawing which shows the water injection condition of the upwelling flow generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の沈降状況を示す説明図である。It is explanatory drawing which shows the subsidence condition of the upwelling generation | occurrence | production seabed artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の着底状況を示す説明図である。It is explanatory drawing which shows the landing situation of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の輸送状況の変更例を示す説明図である。It is explanatory drawing which shows the example of a change of the transport condition of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の設置現場の到着状況の変更例を示す説明図である。It is explanatory drawing which shows the example of a change of the arrival condition of the installation field of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の注水状況の変更例を示す説明図である。It is explanatory drawing which shows the example of a change of the water injection condition of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 同実施形態にかかる湧昇流発生海底人工堤１の沈降状況の変更例を示す説明図である。It is explanatory drawing which shows the example of a change of the subsidence condition of the upwelling generation | occurrence | production submarine artificial dam 1 concerning the embodiment. 本発明の第２の実施形態にかかる湧昇流発生海底人工堤２を示す斜視図である。It is a perspective view which shows the upwelling generation | occurrence | production submarine artificial wall 2 concerning the 2nd Embodiment of this invention. 本発明の第１の実施形態にかかる湧昇流発生海底人工堤１の変更例を示す斜視図である。It is a perspective view which shows the example of a change of the upwelling generation | occurrence | production seabed artificial dam 1 concerning the 1st Embodiment of this invention. 同実施形態にかかる湧昇流発生海底人工堤１の変更例を示す斜視図である。It is a perspective view which shows the example of a change of the upwelling generation submarine artificial dam 1 concerning the embodiment.

符号の説明Explanation of symbols

１，２ 湧昇流発生海底人工堤
１００ 鋼管トラス構造体
１０２ 端部け
１１０ 主鋼管
１１２ 格点部
１１４ 端部
１１６ 排気口
１１７ 注水口
１１８ 隔壁
１１９ 中空空間
１２０ 連結材
１３０，２３０，３３０ 遮蔽板
１３２ 接合材
１３４ スリット
１３６ａ，１３６ｂ 端部
１５０，２５０ 台船
１６０，２６０ タグボート
１７０ クレーン
１８０ 海面
１９０ 海底
２１０ 中心材
２１２ 衝撃緩衝材
２５２ ウインチ
２７０ ワイヤ 1, 2 Upwelling generation artificial seabed 100 Steel pipe truss structure 102 End part 110 Main steel pipe 112 Grade part 114 End part 116 Exhaust port 117 Water injection port 118 Bulkhead 119 Hollow space 120 Connecting material 130, 230, 330 Shielding plate 132 Bonding material 134 Slit 136a, 136b End portion 150, 250 Cargo ship 160, 260 Tug boat 170 Crane 180 Sea surface 190 Sea bottom 210 Center material 212 Shock absorbing material 252 Winch 270 Wire

Claims (10)

仮想三角柱の軸方向の３つの稜に対応するようにそれぞれ配置された３本の主鋼管と，前記主鋼管を相互に連結する複数の連結材とからなる鋼管トラス構造体と；
前記鋼管トラス構造体の外周面または内部に前記主鋼管の軸方向に延設され，相異なる面角度を有する少なくとも２枚の遮蔽板と；
を備え，
前記主鋼管内部の中空空間は，密閉されており，前記密閉された中空空間に注水可能に構成されたことを特徴とする，湧昇流発生海底人工堤。 A steel pipe truss structure comprising three main steel pipes arranged so as to correspond to the three ridges in the axial direction of the virtual triangular prism, and a plurality of connecting members for connecting the main steel pipes to each other;
At least two shielding plates extending in the axial direction of the main steel pipe on the outer peripheral surface or inside of the steel pipe truss structure and having different surface angles;
With
A submarine artificial levitation generating upwelling current, wherein a hollow space inside the main steel pipe is sealed, and water can be poured into the sealed hollow space. 前記連結材は，鋼管で構成されており，前記連結材内部の中空空間に注水可能に構成されたことを特徴とする，請求項１に記載の湧昇流発生海底人工堤。   The upwelling flow generation submarine artificial dam according to claim 1, wherein the connecting member is formed of a steel pipe and is configured such that water can be injected into a hollow space inside the connecting member. 前記遮蔽板は，前記鋼管トラス構造体内部に，相異なる面角度を有するよう３枚配設され，
前記３枚の遮蔽板の一側端部は，３本の前記主鋼管にそれぞれ接合され，
前記３枚の遮蔽板の他側端部は，前記鋼管トラス構造体内部において相互に接合されていることを特徴とする，請求項１または２に記載の湧昇流発生海底人工堤。 Three shielding plates are disposed in the steel pipe truss structure so as to have different surface angles,
One end of each of the three shielding plates is joined to each of the three main steel pipes,
3. The upwelling generation submarine artificial dam according to claim 1, wherein the other end portions of the three shielding plates are joined to each other inside the steel pipe truss structure. 4. 少なくとも３つの前記鋼管トラス構造体を備え，
前記鋼管トラス構造体の軸方向の一端は，相互に接合されていることを特徴とする，請求項１〜３のいずれかに記載の湧昇流発生海底人工堤。 Comprising at least three steel pipe truss structures,
The upwelling generation submarine artificial dam according to any one of claims 1 to 3, wherein ends of the steel pipe truss structure in the axial direction are joined to each other. 前記主鋼管内部において，前記密閉された中空空間を区分する１または２以上の隔壁を備えることを特徴とする，請求項１〜４のいずれかに記載の湧昇流発生海底人工堤。   The upwelling flow generation submarine artificial dam according to any one of claims 1 to 4, further comprising one or more partition walls that divide the sealed hollow space inside the main steel pipe. 衝撃緩衝材が，前記主鋼管の外周面に設けられていることを特徴とする，請求項１〜５のいずれかに記載の湧昇流発生海底人工堤。   The upwelling generation submarine artificial dam according to any one of claims 1 to 5, wherein an impact buffer is provided on an outer peripheral surface of the main steel pipe. 請求項１〜６のいずれかに記載の湧昇流発生海底人工堤を設置箇所の洋上に浮遊させる工程と；
海水を前記湧昇流発生海底人工堤の主鋼管内部の密閉された中空空間に注水する工程と；
前記湧昇流発生海底人工堤を前記設置箇所に沈降させる工程と；
を含むことを特徴とする，湧昇流発生海底人工堤の施工方法。 A step of floating the upwelling generation submarine artificial dam according to any one of claims 1 to 6 on the ocean at an installation location;
Injecting seawater into a sealed hollow space inside the main steel pipe of the upwelling generation seabed artificial levee;
Sinking the upwelling generation submarine artificial dam to the installation location;
A method for constructing an artificial submarine embankment that generates upwelling currents. 前記沈降工程では，前記湧昇流発生海底人工堤の浮力を利用して，沈降させることを特徴とする，請求項７に記載の湧昇流発生海底人工堤の施工方法。   The method for constructing an artificial submarine levee according to claim 7, wherein the subsidence step is performed by using a buoyancy of the artificial submarine levee. 前記湧昇流発生海底人工堤を設置箇所の洋上に浮遊させる工程より前に，
前記湧昇流発生海底人工堤を構築する工程と；
前記設置箇所の洋上まで前記湧昇流発生海底人工堤を輸送する工程と；
をさらに含むことを特徴とする，請求項７または８に記載の湧昇流発生海底人工堤の施工方法。 Before the step of floating the upwelling seabed artificial levee on the ocean at the installation location,
Constructing the upwelling generation submarine artificial levee;
Transporting the upwelling generation submarine artificial dam to the offshore of the installation location;
The method for constructing an artificial seabed with upwelling flow generation according to claim 7 or 8, further comprising: 前記輸送工程は，前記湧昇流発生海底人工堤の浮力を利用して，前記湧昇流発生海底人工堤を洋上に浮遊させて輸送することを特徴とする，請求項９に記載の湧昇流発生海底人工堤の施工方法。   10. The upwelling according to claim 9, wherein the transporting step uses the buoyancy of the upwelling generation submarine artificial levee to float and transport the upwelling generation submarine artificial levee offshore. How to construct a flow-generating submarine artificial levee.
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