JP2008043284A - Structure for rearing coral - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for rearing coral, promoting growth of coral. <P>SOLUTION: The structure for rearing coral is obtained by placing concrete 2 on the outside of a metallic frame body 1SP and attaching coral to be cultured to the outside of a part sunk in the sea by a coral-supporting structure 10. The coral-supporting structure 10 has a cathode C functionalizing as a fixing tool for fixing the coral and an anode A arranged in sea water and electrically connected to the cathode C by a conductor L and having a natural potential which is poorer than that of the cathode C. The cathode C to which coral is fixed is attached through a resin screw 14 to a coral-fixing tool-attaching body 11 embedded in the concrete 2. Conduction of the cathode C to the frame body 1SP is suppressed between the cathode C and the frame body 1SP by the resin screw 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for artificially growing corals.

  In recent years, the decline of coral reefs, such as whitening of coral communities and the death of corals, has become a problem due to the increase in seawater temperature caused by land reclamation and global warming. For this reason, in recent years, attempts have been proposed to artificially grow corals and restore coral reefs. In Patent Document 1, a part of a wall in contact with seawater is made of concrete, a plurality of coral transplant holes are opened at a predetermined interval in the concrete wall, and a coral culture shelf is constructed by attaching corals to the holes. There is disclosed a floating structure provided with.

JP 2005-245374 A

  In general, coral growth requires a certain amount of time. However, when corals are artificially grown, it is desired to increase the coral growth rate as fast as possible. In the coral aquaculture apparatus disclosed in Patent Document 1, there is no mention of promoting coral growth, and there is room for improvement in this respect.

  Then, this invention is made | formed in view of the above, Comprising: It aims at providing the structure for coral cultivation which can accelerate | stimulate the growth of a coral.

  In order to solve the above-described problems and achieve the object, the coral cultivating structure according to the present invention is configured by placing concrete on the outside of a metal frame, and on the outside of the portion immersed in the sea. A coral is attached to the coral, the coral is fixed, and a coral fixing jig serving as a cathode in a galvanic anode method, and a coral fixing jig which is disposed in seawater and is electrically connected to the cathode. An anode having a lower natural potential than that of the coral, a coral fixing jig mounting body that is embedded in the concrete of the structure and to which the coral fixing jig is attached, and an internal structure of the coral fixing jig and the structure And a conduction suppressing means for suppressing conduction between the coral fixing jig and the internal structure.

  This coral cultivating structure is a coral that attaches to a concrete structure having an iron plate or a reinforcing bar as an internal structure, and promotes the growth of the coral using a so-called galvanic anode method. Means are provided for insulating the internal structure of the structure from the cathode. As a result, the electrodeposition current can be reliably passed between the anode and the cathode, and the effect of electrodeposition can be obtained with certainty. As a result, coral growth can be promoted.

  The coral cultivation structure according to the present invention is a structure in which concrete is placed on the outside of a metal frame, and the coral is attached to the outside of a portion that is submerged in the sea. The coral fixing jig to be fixed, the cathode in the galvanic anode method provided on the coral fixing jig side, and disposed in seawater and electrically connected to the cathode, and more natural potential than the cathode Is provided between the negative electrode, the coral fixing jig mounting body to which the coral fixing jig is attached, embedded in the concrete of the structure, and the internal structure of the cathode and the structure. And conduction suppressing means for suppressing conduction between the cathode and the internal structure.

  This coral cultivating structure is a coral that attaches to a concrete structure having an iron plate or a reinforcing bar as an internal structure, and promotes the growth of the coral using a so-called galvanic anode method. Means are provided for insulating the internal structure of the structure from the cathode. As a result, the electrodeposition current can be reliably passed between the anode and the cathode, and the effect of electrodeposition can be obtained with certainty. As a result, coral growth can be promoted.

  Further, like the coral growing structure according to the present invention, in the coral growing structure, the coral fixing jig and the conduction suppressing means may be the same member.

  Further, like the coral growing structure according to the present invention, the coral growing structure is embedded in the concrete and provided between the coral fixing jig mounting body and the frame body. A metal intermediate member for positioning the coral fixing jig mounting body when placing the concrete, and the intermediate member and the frame body provided between the intermediate member and the frame body. And a conductive elastic member that electrically conducts, and the conduction suppressing means may be provided between the cathode and the intermediate member.

  Moreover, the said cathode may be made into a plate-shaped member in the said structure for coral cultivation like the structure for coral cultivation concerning the following this invention.

  Further, like the coral growing structure according to the present invention, in the coral growing structure, the cathode may be configured in a bowl shape, and the coral may be surrounded by the cathode.

  Further, as in the coral growing structure according to the present invention, in the coral growing structure, a current adjusting means may be further provided between the cathode and the anode.

  Further, in the coral cultivation structure, as in the coral cultivation structure according to the present invention, the structure has a hollow portion surrounded by the frame, and the hollow portion is generated. You may make it float on the sea by buoyancy.

  The structure for coral cultivation according to the present invention can promote the growth of corals.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the best mode for carrying out the invention (hereinafter referred to as an embodiment). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, or substantially the same, so-called equivalent ranges.

  This embodiment is a structure configured by placing concrete on the outside of a metal frame, and corals are attached to the outside of the portion of the structure that is submerged in the sea, and the galvanic anode method is used. This is characterized by promoting the growth of the coral.

  FIG. 1 is an overall configuration diagram of a coral cultivation structure according to this embodiment. FIG. 2 is a perspective view of the coral cultivation structure according to this embodiment. FIG. 3 is a perspective view showing a modification of the coral cultivation structure according to this embodiment. This coral-growing structure 1, 1a is a concrete structure having a hollow portion inside, in which concrete is placed outside a hollow frame 1SP made of a metal plate, and generates buoyancy by the hollow portion. And float on the sea. Note that the coral cultivation structure according to this embodiment does not have to be a buoyant body having a hollow portion as long as the part to which the coral is attached is submerged in the sea. It may be a caisson or a breakwater.

  Here, the coral cultivating structure 1 shown in FIGS. 1 and 2 has a form in which the entire outer surface of the frame 1SP is covered with concrete 2, and the frame 1SP is not exposed from the concrete 2. On the other hand, the structure 1a for coral cultivation shown in FIG. 3 has a form in which the bottom 1SB of the frame 1SP is not covered with the concrete 2, and the bottom 1SB is exposed from the concrete 2. In the coral cultivation structure 1a shown in FIG. 3, the bottom 1SB is submerged in the sea.

  The hollow frame 1SP constituting the coral growing structure 1 or 1a is a basic skeleton of the coral growing structure 1 or 1a. For example, the steel plates are combined by welding or the like, and the combined steel plates are ribs 1SR. Reinforced with. Then, after arranging a plurality of gibber 1SE and rebar 1SC on the outer surface of the frame 1SP, concrete is cast on the outer surface of the frame 1SP to form the concrete 2, and the coral cultivation structure 1 is completed. Here, the frame body 1SP, the gibber 1SE, and the reinforcing bar 1SC are the internal structures of the coral cultivation structures 1 and 1a. A coral support structure 10 according to this embodiment is provided on the outside of the coral cultivation structure 1 and immersed in the sea, and the coral S is formed through the coral support structure 10. It is attached to the object 1. The configuration of the coral support structure 10 will be described later.

  The coral cultivating structures 1 and 1a may be prepared as a dedicated structure for culturing the coral S and moored from the quay or the sea floor. It may be used for aquaculture and as a floating pier. Here, when the coral cultivating structure 1 is configured as a movable buoyant body, for example, when the seawater temperature rises abnormally, the coral that is growing together with the floating body structure is moved to the sea area of an appropriate water temperature. Can do. In addition, during a storm due to a typhoon or the like, the coral that is growing together with the floating structure can be moved into the port, so damage to the coral during the growth can be minimized.

  Since the metal frame 1SP constituting the coral growing structures 1 and 1a is in contact with seawater that has passed through the concrete 2, it is necessary to avoid corrosion. For this reason, in this embodiment, the frame 1 is anticorrosive by an electrocorrosion protection method. That is, the anticorrosion anode metal 3 having a lower natural potential than the metal to be anticorrosive (metal constituting the frame 1SP) is connected to the frame 1SP via the conductor 4. The anticorrosion anode metal 3 is disposed in the sea. This suppresses corrosion of the frame 1SP.

  The coral cultivation structures 1 and 1a according to this embodiment promote the survival and growth of the coral S by electrodeposition using a so-called galvanic anode method. For this reason, the corrugated structure 1, 1a according to this embodiment is provided with an anode A in the galvanic anode method. Next, a method for culturing coral S using the galvanic anode method will be described.

FIG. 4 is a conceptual diagram for explaining the principle of the coral cultivation method according to this embodiment. As shown in FIG. 4, a cathode C disposed on the coral S side is provided, and a metal having a lower natural potential than the cathode C is disposed as an anode (a galvanic anode) A. Then, the anode A and the cathode C are connected by the conductor L, and the anode A-cathode C is utilized by utilizing the battery action of the anode A, the cathode C, and the electrolyte (seawater) interposed between the anode A and the cathode C. A current (electrodeposition current) flows between them. As a result, calcareous (electrodeposited minerals) such as CaCO ₃ , Mg (OH) ₂ , and MgCO ₃ are deposited on the cathode C, and alkalinization of the surrounding environment of the cathode C is promoted.

  The calcareous deposited on the cathode C becomes a base on which the coral S is settled. Further, when the alkalinization of the surrounding environment of the cathode C is promoted (that is, the pH of seawater around the cathode is increased), the energy required for calcification of the coral S is reduced, so that the growth rate and resistance of the coral S are reduced. To improve. By these actions, in the coral aquaculture apparatus according to this embodiment, the growth of the coral S can be promoted, and the survival to the cathode C can be made more reliable.

In the case of using the galvanic anode method, in order to promote the deposition of calcareous material on the cathode C and the alkalinization of the environment around the cathode C, the type of the anode (fluidic anode) 10 is important. If the cathodic potential is about −1000 mV (saturated permeation electrode reference, hereinafter omitted) noble side (potential is higher), the reaction at the cathode C is generally an oxygen reduction reaction represented by the equation (1), and the current density The size is about 100 mA / m ² . The anode A corresponding to this reaction is composed of an aluminum-based material, but the calcareous deposition is delayed at the current value. On the other hand, since the consumption of the anode A is relatively small, the life of the anode A is prolonged.
O ₂ + H ₂ O + 4e ⁻ → 4OH ⁻ (1)

On the other hand, if the cathode potential is lower than −1100 mV (potential is lower), the reaction at the cathode C is a hydrogen generation reaction represented by the general formula (2), and the current density is 1000 mA / m ² or more. Is also possible. The anode A corresponding to this reaction is made of a magnesium-based material. At the current value, calcareous precipitation is accelerated, but the galvanic anode is greatly consumed, and the life of the anode A is shortened.
2H ₂ O + 2e ⁻ → H ₂ + 2OH ⁻ (2)
In this embodiment, the material of the anode A is selected and the shape, arrangement, etc. of the anode A are changed in consideration of calcareous precipitation, consumption of the anode A, adhesion suppression of algae, shellfish, and the like. . For example, in the initial stage, the current flowing from the anode A to the cathode C is increased to suppress the attachment of algae and shellfish, and after a certain period of time, the current is decreased to promote coral growth.

In order to promote the growth of the coral S, it is preferable that the current density is at least larger than the current density (about 100 mA / m ² ) in normal cathodic protection. Preferably, it is not less than 2 times and not more than 10 times the current density in normal cathodic protection. In order to realize this, the cathode potential may be set lower than about −1000 mV. In order to promote the growth of the coral S, the material and arrangement of the anode A that can realize the current density are selected.

  In promoting the growth of the coral S, it is preferable to change the current density according to the flow velocity of the sea area where the coral S is grown. More specifically, the current is increased as the flow velocity in the sea area where the coral S is grown increases. As a result, the deposition of calcareous material on the cathode C and the alkalinization of the environment around the cathode C can be promoted more reliably.

  Here, the material of the cathode C may be any metal whose natural potential is noble (higher potential) than that of the anode A. However, considering use in seawater, stainless steel, titanium (Ti), It is preferable to use a metal having high corrosion resistance such as a titanium alloy. Further, as described above, the anode A uses a metal on the base side (potential is lower) than the cathode C. Among such metals, the material constituting the anode A is, for example, zinc, zinc alloy (zinc-based), aluminum, aluminum alloy (aluminum-based), taking into account the magnitude and life of the applied current. At least one of magnesium and a magnesium alloy (magnesium-based) is used.

  In order to flow a large current, a magnesium system is used for the anode A, and when the current may be smaller than this, a zinc system or an aluminum system is applied to the anode A. However, the magnesium system with a large current has a short life, and the zinc system and the aluminum system with a small current have a long life. For the purpose of maintaining a large current in the initial stage and a medium current in the latter half, a combination of magnesium and zinc or a combination of magnesium and aluminum may be used.

  FIG. 5 is a conceptual diagram showing another configuration example of the coral reef structure according to this embodiment. As described above, a current adjusting means (for example, a diode or a resistor) 20 capable of controlling the magnitude of the current flowing between the anode A and the cathode C may be provided between the cathode C and the anode A. For example, a diode is inserted in series with respect to the anode A and the cathode C. As a result, the current flowing between the anode A and the cathode C can be adjusted according to the sea conditions such as the flow velocity and salinity of the sea area where the coral S is cultivated. Environment. Next, the structure of the coral support structure 10 provided in the coral cultivating structure 1, 1a according to this embodiment will be described.

  FIG. 6 is a cross-sectional view for explaining a coral support structure provided in the coral cultivation structure according to this embodiment. FIG. 7 is a plan view showing a state in which corals are attached to the cathode. In the coral support structure 10 according to this embodiment, the cathode C also serves as a coral fixing jig, and the coral S is fixed to the cathode C as shown in FIG. In this embodiment, the cathode C is composed of a net-like and plate-like member in which metal wires are combined in a lattice shape. The coral S is bound and fixed to the cathode C by, for example, a wire or a thread. In this way, by fixing the coral S to the net-like and plate-like member, the contact portion between the coral S and the coral fixing jig (cathode C) can be enlarged, so that the coral S can be promoted.

  In the coral support structure 10 according to this embodiment, a coral fixing jig attachment body 11 is embedded in the concrete 2 of the coral cultivation structures 1, 1 a (see FIGS. 1 to 3). Then, a cathode (coral fixing jig) C to which the coral S is fixed is attached to the coral fixing jig attachment body 11, and the coral S is attached to the coral cultivation structures 1 and 1a. Since the coral fixing jig attachment body 11 is embedded in the concrete 2, it is preferable that the coral fixing jig attachment body 11 is made of a material that is easily compatible with the concrete 2. Examples of such a material include cement, mortar, and ceramic.

  An intermediate member 12 that is a rod-shaped member made of metal is attached to the coral fixing jig attachment body 11. When the concrete 2 is placed on the coral growing structures 1 and 1a (see FIGS. 1 to 3), a mold is provided outside the frame 1SP. At this time, the coral fixing jig mounting body 11 and the intermediate member 12 are arranged between the frame body 1SP and the mold frame, and the coral fixing jig mounting body 11 is brought into contact with the mold frame to thereby form the mold frame. Positioning and supporting. After the concrete 2 is placed, the coral fixing jig attachment body 11 and the intermediate member 12 are embedded in the concrete 2.

  Since the intermediate member 12 is made of a metal (for example, iron), the intermediate member 12 may be corroded by seawater penetrating from the concrete 2 of the coral growing structure 1 or 1a. For this reason, by electrically connecting the intermediate member 12 to the frame 1SP, the anticorrosion current flowing through the frame 1SP is also passed through the intermediate member 12.

  Here, the thickness of the concrete 2 may change depending on the placement conditions of the concrete 2, and as a result of insufficient contact between the intermediate member 12 and the frame 1SP, conduction between the intermediate member 12 and the frame 1SP is achieved. May be insufficient. For this reason, in this embodiment, the elastic member (conductive elastic member) 13 which has electroconductivity is interposed between the intermediate member 12 and the frame 1SP.

  As a result, the conductive elastic member 13 is pressed against and contacts the intermediate member 12 and the frame body 1SP, so that the conduction between the intermediate member 12 and the frame body 1SP can be ensured via the conductive elastic member 13. As a result, the anticorrosion current flowing through the frame 1SP can be energized to the intermediate member 12, and the corrosion of the intermediate member 12 can be reliably suppressed. For example, a metal spring can be used as the conductive elastic member 13.

  In this embodiment, an electrodeposition current is allowed to flow between the anode A and the cathode C using the galvanic anode method. Here, when the cathode C and the frame 1SP are conducted through the metal intermediate member 12, the electrodeposition current flows to the frame 1SP, and the effect of promoting the coral S activation and growth by electrodeposition is reduced. End up. Therefore, when the cathode C, which is a coral fixing jig, is attached to the coral fixing jig attachment body 11, conduction between the cathode C and the frame body 1SP is suppressed as much as possible.

  In order to suppress conduction between the cathode C and the frame body 1SP as much as possible, a fixture made of an insulator (for example, a resin material or ceramic) is used as conduction suppression means, and the cathode C is fixed to the coral fixing jig mounting body 11. To do. In this embodiment, a resin screw 14 is used as the fixture, the resin screw 14 is screwed into a screw hole 11 h provided in the coral fixing jig mounting body 11, and a nut 15 is further screwed into the resin screw 14. The cathode C is sandwiched between the coral fixing jig attachment body 11.

  Thus, by providing the conduction suppressing means (fixing tool) between the cathode C and the frame body 1SP which is the internal structure of the coral growing structure 1, 1a, the cathode C and the intermediate member 12 are interposed. The possibility of electrical connection with the frame body 1SP can be suppressed as much as possible. As a result, an electrodeposition current is reliably applied between the anode A and the cathode C, and activation and growth of the coral S are promoted by electrodeposition.

  In addition, since the effect of accelerating and promoting the growth of the coral S by electrodeposition is reduced as the electrodeposition current flows through the nut 15, it is preferable that the nut 15 is also an insulator (for example, a resin material or ceramics). Alternatively, an insulator may be disposed between the nut 15 and the cathode C so as to suppress the electrodeposition current flowing to the nut 15 as much as possible.

  A washer 17 serving as an electrode is interposed between the nut 15 and the cathode C, and the washer 17 and the anode A are connected by the conductor L, whereby the cathode C and the anode A are electrically connected. An insulator (for example, a sheet of rubber or resin) 16 is interposed between the concrete 2 of the coral growing structure 1, 1 a and the cathode C, and conduction between the cathode C and the frame 1 SP is more reliably suppressed. To do. Thereby, an electrodeposition current can be more reliably supplied between the anode A and the cathode C, and the activation and growth of the coral S can be promoted by electrodeposition.

  FIG. 8 is an explanatory view showing a modification of the cathode. In the example shown in FIG. 8, corals are arranged inside the cage cathode Cc using the cage cathode Cc formed in a cage shape by combining metal wires in a lattice shape and three-dimensionally. As a result, the coral can be protected from floating matters in the sea and organisms that damage the coral. Further, by protecting the coral, it is possible to more effectively exhibit the coral survival and growth effect by electrodeposition. Here, the coral can be fixed to the bowl-like cathode Cc with a wire, a thread or the like. In this case, the bowl-shaped cathode Cc also serves as a coral fixing jig. Further, a coral fixing jig for fixing the coral may be prepared, and the coral fixing jig for fixing the coral may be attached to the bowl-shaped cathode Cc or the resin screw 14.

  Further, the protruding amount of the resin screw 14 protruding from the nut 15 may be increased, and the coral may be fixed to the resin screw 14 protruding from the nut 15 using a wire, a thread, or the like. In this case, the resin screw 14 functions as a coral fixing jig, and the bowl-shaped cathode Cc is provided on the coral fixing jig side. In this case, the resin screw 14 is provided between the bowl-shaped cathode Cc and the frame body 1SP which is an internal structure of the coral growing structure 1, 1a, and the conduction between the bowl-shaped cathode Cc and the frame body 1SP. It also functions as a continuity suppressing means that suppresses.

  Thereby, the possibility that the cathode C and the frame 1SP are electrically connected via the intermediate member 12 can be suppressed as much as possible. As a result, an electrodeposition current is reliably passed between the anode A and the cathode C, and the activation and growth of the coral S are promoted by electrodeposition. When fixing a coral to the resin screw 14, a coral fixing jig and a conduction | electrical_connection suppression means are comprised with the same member. In this case, since it is not necessary to separately provide the coral fixing jig and the conduction suppressing means, the number of parts can be reduced and the configuration can be simplified.

  The saddle-like cathode Cc has a part of the saddle-like cathode Cc sandwiched between the nut 15 and the coral fixing jig attachment body 11, and the nut 15 is screwed into the resin screw 14 attached to the coral fixation jig attachment body 11. To fix. A washer 17 that also serves as an electrode is interposed between the nut 15 and the cathode C, and the washer 17 and the anode A are connected by the conductor L, whereby the bowl-shaped cathode Cc and the anode A are electrically connected. In addition, an insulator is provided between the coral fixing jig mounting body 11 and the bowl-shaped cathode Cc to further suppress conduction between the bowl-shaped cathode C and the frame body 1SP via the intermediate member 12 and the conductive elastic member 13. You may make it do.

  FIG. 9 is an explanatory view showing a modification of the coral support structure in this embodiment. FIG. 10 is a plan view showing a modification of the coral support structure in this embodiment. The coral support structure 10a according to this modification uses a plate-like cathode (plate-like cathode) Cp as a coral fixing jig. Then, the plate-like cathode Cp is attached to the coral fixing jig attachment body 11 with a fixture attached to the plate-like cathode Cp. In this modification, the cathode is plate-shaped, but a net-like cathode as described in the above embodiment may be used. In this way, by fixing the coral S to the plate-like member, the contact portion between the coral S and the coral fixing jig (plate-like cathode Cp) can be increased, so that the survival of the coral S can be promoted.

  In this modification, the fixture includes a screw 32 that is screwed into the screw hole 11 h of the coral fixing jig attachment body 11, and a bracket 31 that connects the plate-like cathode Cp and the screw 32. Also in this modified example, conduction between the plate-like cathode Cp and the frame 1SP is suppressed as much as possible, and an electrodeposition current is reliably passed between the anode A and the plate-like cathode Cp, and the coral S is activated and grown by electrodeposition. Promote. For this reason, it is preferable that at least one of the screw 32 or the bracket 31 constituting the fixture is made of an insulator. Note that when the bracket 31 is made of metal, an electrodeposition current also flows to the bracket 31 and there is a possibility that the effect of promoting the growth and growth of the coral S may be reduced. Therefore, at least the bracket 31 in contact with the plate-like cathode Cp is insulated. The body is preferable.

  When the grown coral S is moved to another sea area, it is necessary to remove the coral S from the coral growing structures 1, 1 a (see FIGS. 1 to 3). Since the operation of removing the coral S from the coral cultivating structures 1 and 1a is underwater, an operation as simple as possible is preferable. In this modification, the plate-like cathode Cp and the fixture (the bracket 31 and the screw 32) are integrally configured. For this reason, when the coral S is moved, the plate-like cathode Cp may be removed while the coral S is attached, so that the operation of moving the coral S becomes easy. In addition, the operation of attaching the coral S to the coral cultivating structures 1 and 1a can be performed by attaching the plate cathode Cp to the coral cultivating structures 1 and 1a while the coral S is attached. become.

  As described above, the coral cultivating structure according to this embodiment attaches coral to a concrete structure having an iron plate or a reinforcing bar as an internal structure, and promotes coral growth using a so-called galvanic anode method. . And since the means which insulates the internal structure of the structure for coral cultivation and a cathode is provided, the electrodeposition electric current can be reliably flowed between an anode and a cathode, and the effect of electrodeposition can be acquired reliably. This can promote coral growth. In addition, what has the structure similar to this embodiment has an effect | action and effect similar to this embodiment.

  As described above, the coral growing device and the coral growing structure according to the present invention are useful for coral cultivation, and are particularly suitable for promoting the growth of corals.

It is a whole block diagram of the structure for coral cultivation concerning this embodiment. It is a perspective view of the structure for coral cultivation concerning this embodiment. It is a perspective view which shows the modification of the structure for coral cultivation which concerns on this embodiment. It is a conceptual diagram for demonstrating the principle of the culture method of the coral which concerns on this embodiment. It is a conceptual diagram which shows the other structural example of the structure for coral reefs concerning this embodiment. It is sectional drawing explaining the coral support structure with which the structure for coral cultivation which concerns on this embodiment is provided. It is a top view which shows the state which attached the coral to the cathode. It is explanatory drawing which shows the modification of a cathode. It is explanatory drawing which shows the modification of the coral support structure in this embodiment. It is a top view which shows the modification of the coral support structure in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Coral upbringing structure 1SB Bottom part 1SC Reinforcing bar 1SE Giber 1SP Frame 1SR Rib 2 Concrete 3 Corrosion prevention anode metal 4 Conductor 10, 10a Coral support structure 11 Coral fixing jig attachment body 12 Intermediate member 13 Conductive elastic member 14 Resin screw 15 Nut 17 Washer 31 Bracket 32 Screw A Anode C Cathode Cc Cage-like cathode Cp Plate-like cathode L Conductor S Coral

Claims (8)

It is a structure that is constructed by placing concrete on the outside of a metal frame, and the coral is attached to the outside of the part that is immersed in the sea.
The coral is fixed, and a coral fixing jig to be a cathode in the galvanic anode method,
An anode disposed in sea water and electrically connected to the cathode and having a lower natural potential than the cathode;
A coral fixing jig mounting body that is embedded in the concrete of the structure and to which the coral fixing jig is attached;
Conduction suppression means provided between the coral fixing jig and the internal structure of the structure, and suppressing conduction between the coral fixing jig and the internal structure;
The structure for coral cultivation characterized by including. It is a structure that is constructed by placing concrete on the outside of a metal frame, and the coral is attached to the outside of the part that is immersed in the sea.
A coral fixing jig for fixing the coral;
Provided on the coral fixing jig side, a cathode in the galvanic anode method,
An anode disposed in sea water and electrically connected to the cathode and having a lower natural potential than the cathode;
A coral fixing jig mounting body that is embedded in the concrete of the structure and to which the coral fixing jig is attached;
A conduction suppression means provided between the cathode and the internal structure of the structure to suppress conduction between the cathode and the internal structure;
The structure for coral cultivation characterized by including.   The coral cultivation structure according to claim 2, wherein the coral fixing jig and the conduction suppressing means are the same member. A metal intermediate that is embedded in the concrete and is provided between the coral fixing jig mounting body and the frame body and positions the coral fixing jig mounting body when placing the concrete. Members,
A conductive elastic member provided between the intermediate member and the frame and electrically connecting the intermediate member and the frame;
The coral cultivation structure according to any one of claims 1 to 3, wherein the conduction suppressing means is provided between the cathode and the intermediate member.   The said cathode is a plate-shaped member, The structure for coral cultivation of any one of Claims 1-4 characterized by the above-mentioned.   The said cathode is comprised in a bowl shape, and the said coral is enclosed by the said cathode, The structure for coral cultivation of any one of Claims 1-4 characterized by the above-mentioned.   The coral cultivation structure according to any one of claims 1 to 6, wherein a current adjusting means is provided between the cathode and the anode.   The coral according to any one of claims 1 to 7, wherein the structure has a hollow portion surrounded by the frame body and floats on the sea by buoyancy generated by the hollow portion. Growing structure.

Images