Method for treating seaweed bed base and seaweed bed reef

Abstract

To provide a method for treating a seaweed bed base capable of increasing an amount of attached spores, etc. from a fist year of installation similarly to that after one year or more has passed, and seaweed bed reef.SOLUTION: A seaweed bed reef 1 is constituted by attaching a seaweed bed base to a seaweed bed reef body 2, serving as a steel frame body, and after removing black scale from a surface of an angle steel 13 used as the seaweed bed base, the surface is corroded, so that spores and seeds of seaweed, sea grass, etc. can easily attached thereto in the sea from the beginning of the installation. Further, any of shot blasting, sand blasting, wire brushing, a cup wire, a disk sander and a barrel is used to remove the black scale, so that the black scale can be removed by a physical method. Alternatively, chemicals are used to remove the black scale, so that the black scale can be removed by a chemical method.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a method for treating a seaweed bed substrate that is made easy for seaweed spores and seaweed seeds to adhere to, and to a seaweed bed reef. [Background technology]

[0002] Conventional seaweed bed reefs of this type include those that use roughly hexahedral blocks made of concrete or the like (for example, Patent Document 1), and artificial fish reefs made of metals such as iron, steel frames, and stainless steel, synthetic resins such as FRP, or concrete (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3196564 [Patent Document 2] JP 2004-298172 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Documents 1 and 2 above, substrates for seaweed beds include concrete, synthetic resin, and steel, but in the first year after installation, those using concrete substrates have more algae spores attached than those using steel substrates.

[0005] This is because, in the case of a concrete substrate, surface treatments such as broom marking allow spores and other microorganisms to adhere to the entire surface of the substrate, whereas in the case of a steel substrate, the steel surface is smooth, making it difficult for spores and other microorganisms to adhere, and spores only adhere to the corners and edges of the components.

[0006] However, after the second and third years after installation, the surface of the steel substrate becomes roughened, increasing the number of areas on which spores and the like can adhere, resulting in an increased amount of adhesion. This discovery led the inventors to arrive at the present invention, as it turned out that more spores and the like adhere to steel substrates than to concrete substrates.

[0007] The present invention aims to solve the above problems and provide a method for treating a seaweed bed substrate and a seaweed bed reef that can increase the amount of spores and the like attached from the first year of installation to the same amount as after more than one year has passed. [Means for solving the problem]

[0008] The invention described in claim 1 of the present invention is characterized in that after removing the black scale from the surface of a steel material to be used as a substrate for a seaweed bed reef, the surface is corroded.

[0009] The invention described in claim 2 of the present invention is characterized in that any one of shot blasting, sand blasting, wire brushing, cup wire, disc sander, and barrel is used to remove the black scale.

[0010] The invention described in claim 3 of the present invention is characterized in that a chemical is used to remove the black scale.

[0011] The invention described in claim 4 of the present invention is characterized in that, while the black skin is left on the surface of the steel material used as a substrate for a seaweed bed reef, irregularities are formed on the black skin.

[0012] The invention described in claim 5 of the present invention is characterized in that steel material treated by the method for treating a seaweed bed substrate described in any one of claims 1 to 4 is used, and the steel material is attached to a steel frame or concrete frame body to turn it into a seaweed bed reef. Effect of the Invention

[0013] According to the configuration of claim 1 of the present invention, spores and seeds of seaweed, seaweed, etc. are likely to adhere to the device in the sea from the beginning of installation.

[0014] Moreover, according to the configuration described in claim 2, the black scale can be removed by a physical method.

[0015] Moreover, according to the configuration described in claim 3, the black scale can be removed by a chemical method.

[0016] According to the description of claim 4, the fine irregularities on the surface make it easy for spores and seeds of seaweed, seaweed, etc. to adhere to the surface in the sea from the time of installation.

[0017] According to the description of claim 5, a seaweed bed reef can be obtained that is easy for spores and seeds of seaweed, seaweed, etc. to attach to in the sea from the beginning of installation. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing first and second embodiments of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 11 is a perspective view showing a third embodiment of the present invention. [Figure 4] FIG. [Diagram 5] FIG. 11 is a perspective view showing a fourth embodiment of the present invention. [Figure 6] FIG. [Figure 7] FIG. 11 is a perspective view showing a fifth embodiment of the present invention. [Figure 8] FIG. [Figure 9] FIG. 11 is a perspective view showing a sixth embodiment of the present invention. [Figure 10] FIG. [Figure 11] FIG. 11 is a perspective view showing a seventh embodiment of the present invention. [Figure 12] FIG. [Figure 13] FIG. 11 is a perspective view showing an eighth embodiment of the present invention. [Figure 14] FIG. [Figure 15]FIG. [Figure 16] FIG. [Figure 17] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that the embodiments described below do not limit the contents of the present invention described in the claims. Also, not all of the configurations described below are necessarily essential requirements of the present invention. EXAMPLES

[0020] Example 1 of the present invention will be described below with reference to Figures 1 and 2. A steel material, in particular a steel material (hereinafter referred to as black skin steel material) whose surface is covered with an oxide layer (hereinafter referred to as black skin) by hot rolling, is used as the seaweed bed substrate that constitutes the seaweed bed reef 1. Examples of the steel material that is the seaweed bed substrate include steel plate 11 (Figures 1 and 2), flat steel 12 (Figures 3 to 6), and angle iron 13 (Figures 7 to 12).

[0021] In the first processing method of the present embodiment, the black scale of the black-scale steel material is removed by a physical method. Examples of physical methods include the following. For example, processing by shot blasting is a technique in which granules called a projectile are collided with a steel material having a black scale to process the surface of the steel material, and the black scale is removed by the shot blasting, and the surface is roughened.

[0022] Sandblasting is a method of processing the surface of steel by spraying an abrasive such as granular sand onto the surface of black steel. Shot blasting removes the black scale and also roughens the surface.

[0023] In the treatment using a wire brush, the wire brush used is a brush made of multiple metal brush wires in contact with an implanted member, and the tips of the multiple brush wires are brought into contact with the surface of the steel material and polished to remove the black scale and roughen the surface. The wire brush includes various types of wire brushes such as cup wire brushes.

[0024] In addition, the treatment using a disk sander involves rotating a disk-shaped grinding wheel and bringing this rotating grinding wheel into contact with the surface of the black-skinned steel material to grind it, thereby removing the black scale and roughening the surface.

[0025] In the treatment using a barrel, the surface of the black steel material is subjected to barrel polishing, whereby the black scale can be removed and the surface can be roughened.

[0026] Furthermore, in the second treatment method of this embodiment, the black scale of the black-skinned steel material is removed by a chemical method. For example, the black scale on the surface of the black-skinned steel material is removed by applying or spraying an acidic or other chemical. The black scale can also be removed by immersing the black-skinned steel material in a chemical. The chemical dissolves and removes the black scale on the surface, and its composition can include an inorganic acid, an organic acid, a surfactant, a thickener, and water. The chemical can also be hydrochloric acid or sulfuric acid.

[0027] The black scale of the black-skinned steel material is removed using at least one of the above methods, and the surface from which the black scale has been removed rusts and corrodes over time, thereby obtaining a seaweed bed substrate.

[0028] Next, an example of the seaweed bed reef 1 will be described. As shown in FIG. 1, the seaweed bed reef 1 comprises a seaweed bed reef main body 2 having a substantially cubic frame shape, and this seaweed bed reef main body 2 is a frame body. In this example, the seaweed bed reef main body 2 is made of precast concrete, and comprises upper and lower frame bodies 3, 4 having upper and lower openings 3K, 4K in the center, and has a hollow shape in which the corners of the upper and lower frame bodies 3, 4 are connected by four pillars 5, 5, 5, 5, and side openings 6K are formed in the front, rear, left and right side parts 6, 6, 6, 6. The seaweed bed reef 1 is constructed by using steel material that has been treated by a method for treating a seaweed bed substrate and attaching the steel material to the seaweed bed reef main body 2, which is a frame body.

[0029] The upper surface of the frame 3, the lower surface of the frame 4 and the outer surfaces of the four side portions 6, 6, 6, 6 are formed flat. The seaweed bed reef main body 2 can be made of steel or synthetic resin other than concrete. Since the seaweed bed reef main body 2 has a regular hexahedral shape with openings 3K, 4K, 6K, 6K, 6K, 6K, it can be and is easy to line up adjacent to each other in the front, back, left and right directions.

[0030] When the steel plate 11 is used as the steel material, the steel plate 11 is large enough to close the upper opening 3K. An L-shaped pin-like mounting member 21 is used to mount the steel plate 11 on the upper surface of the upper frame 3. The lower side of the vertical piece 21T of the steel mounting member 21 is embedded and fixed in the upper frame 3, and the horizontal piece 21Y is abutted against the upper surface of the steel plate 11 to fix the steel plate 11 to the upper surface of the seaweed bed reef main body 2. The mounting member 21 is made of steel, and the steel plate 11 and the horizontal piece 21Y of the mounting member 21 may be welded together. Although the treatment is facilitated by removing the black scale only from the upper surface of the steel plate 11, it is preferable to remove the black scale from the entire surface.

[0031] Furthermore, when the seaweed bed reef main body 2 is made of steel, a steel plate 11 as a steel material may be attached and fixed to the seaweed bed reef main body 2 by welding, and the same applies to the following embodiments.

[0032] The steel plate 11, which is the substrate for the seaweed bed, is attached at the factory. After this, the seaweed bed reefs 1 are shipped and carried to a storage area in the fishing ground where they will be sunk. Once the required number of seaweed bed reefs 1 are prepared, they are loaded onto a crane ship and sunk into the sea. In this way, at least several days pass between production at the factory and the sinking, during which time the surface of the steel material from which the black skin has been removed corrodes.

[0033] In addition, if the steel plate 11, which is the substrate for the seaweed bed, is attached or the final assembly of the seaweed bed reef 1 is performed at the storage site, which is a place other than the factory, after the black scale is removed, it takes more time from the removal of the black scale to the sinking, and corrosion accompanied by rust progresses. Even if the assembly work of the seaweed bed reef 1 is started immediately after the removal of the black scale, it takes 14 days or more, usually one month (30 days) or more, from the removal of the black scale to the sinking. In this way, the steel material corrodes due to the time required for transportation, assembly, storage, etc. after the removal of the black scale. Although seawater corrosion progresses in the sea after the sinking, corrosion due to rust progresses faster in the air atmosphere than in the sea. For example, if the black scale is removed by blasting treatment or the like and the base material of the steel material is exposed, corrosion will progress within a few days unless anti-rust treatment or painting is performed immediately.

[0034] In this way, by removing the black scale by physical or chemical treatment to expose the base material of the steel and corroding the surface, fine irregularities are formed on the surface of the steel, making it easier for spores, seeds, etc. to adhere, and the amount of adherence of spores, etc. can be increased, similar to that of steel that has been installed for several years since the first year. In addition, since the surface is roughened by each treatment, the roughening and corrosion provide a surface with fine irregularities suitable for the adhesion of spores, seeds, etc.

[0035] Then, after the removal step of removing the black scale, there is the attachment step of attaching the steel material from which the black scale has been removed to the seaweed bed reef main body 2 without any rust-proofing or painting, the sinking step of sinking the seaweed bed reef 1 in water such as the sea after this attachment step, and the corrosion step of corroding the steel material in the air between the removal step and the sinking step, so simply by adding the removal step of removing the black scale, spores and seeds of seaweed and seaweed etc. become more likely to adhere in the sea from the beginning of installation. Also, in this case, since the steel material is attached to the seaweed bed reef main body 2 after the removal step, the process of removing the black scale becomes easier.

[0036] As a modified example, after the pre-treatment attachment process in which steel material is attached to the seaweed bed reef main body 2 before removing the black skin, or after the removal process in which the black skin is removed if at least a part of the seaweed bed reef main body 2 is made of black-skinned steel, a sinking process is provided in which the seaweed bed reef 1 is submerged in water such as the sea without any rust-proofing treatment or painting, and a corrosion process is provided in which the steel material corrodes in the air after the removal process and before the sinking process.Therefore, simply by adding the removal process of removing the black skin, spores and seeds of seaweed, seaweed, etc. will be more likely to attach to the seaweed bed reef in the sea from the beginning of installation.

[0037] In this embodiment, corresponding to claim 1, the black skin on the surface of the steel plate 11, which is the steel material used as the seaweed bed substrate of the seaweed bed reef 1, is removed and then the surface is corroded, so that spores and seeds of seaweed, seaweed, etc. become likely to adhere to it in the sea from the beginning of installation.

[0038] In this embodiment, corresponding to claim 2, the black scale is removed using any one of shot blasting, sand blasting, wire brushing, cup wire, disc sander, and barrel, so that the black scale can be removed by a physical method.

[0039] In this embodiment, in accordance with claim 3, a chemical is used to remove the black scale, so that the black scale can be removed by a chemical method.

[0040] In this embodiment, corresponding to claim 5, a steel plate 11, which is a steel material that has been treated by the method for treating a seaweed bed substrate, is used and the steel plate 11 is attached to the seaweed bed reef main body 2, so that a seaweed bed reef 1 can be obtained that is prone to attract spores and seeds of seaweed, seaweed, etc. in the sea from the moment it is installed in the ocean.

[0041] As an effect of the embodiment described below, since the steel material is attached to the seaweed bed reef main body 2 after the black scale is removed, the work of removing the black scale becomes easy. Also, since the seaweed bed reef 1 with the steel plate 11, which is the seaweed bed substrate, attached is sunk in the sea 14 days or more, preferably one month (30 days) or more after the black scale is removed from the black steel material, the corrosion of the steel plate 11 progresses sufficiently during this time, and spores, seeds, etc. become likely to adhere to the surface of the steel plate 11. In other words, the seaweed bed reef 1 is sunk on or after the 15th day, which is 14 days after the black scale is removed, and preferably on or after the 31st day, which is 30 days after the removal of the black scale.

[0042] Moreover, the steel plate 11, which is the substrate for the seaweed bed, is large enough to cover the upper opening 3K by itself, making it easy to install and allowing the surface area to be large overall. The surface can be roughened by physical treatment, and for example, in shot blasting, the size of the granules used can be selected to select the size of the surface irregularities. In addition, shot blasting and sand blasting are methods of removing black skin by colliding granules and roughening the surface, so the finish is uniform and the treatment can be performed efficiently. Furthermore, the L-shaped mounting member 21 can be used in mounting structures for various steel materials as described later, making it highly versatile. In addition, the steel mounting member 21 is a structure in which the steel plate 11 is held down or welded to be fixed, so it can be used even if it rusts, whereas structures using screws or screw holes cannot be used if they rust. EXAMPLES

[0043] 1 and 2 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are given the same reference numerals and their explanations are omitted. In this embodiment, the surface is roughened while leaving the black scale on the surface, without removing it.

[0044] As an example, a paint primer treatment agent is applied to the surface of a steel material, and the black scale is then roughened to create a fine irregularity on the surface. The paint primer treatment agent is applied to the surface of a steel material from which the black scale has been removed, or to the black scale to improve the adhesion of the paint applied thereto, and the surface to which the paint primer treatment agent is applied on top of the black scale becomes an irregular surface with fine irregularities due to the components of the paint primer treatment agent.

[0045] Furthermore, a primer is used as a paint base treatment agent that allows painting even if the surface of the black scale is corroded, and unlike acidic chemicals, it is preferable to use one that has the function of adhering the black scale with a strong adhesive force, rather than removing the black scale or rust.

[0046] As another example, resin mortar or the like is applied to the surface of the steel material, and the surface of the resin mortar is roughened by a broom finish or the like. Alternatively, by spraying resin mortar, an uneven surface having fine irregularities made of resin mortar is formed, and the surface is roughened. Note that paint primer treatment agents and resin mortar are examples of hardening coating materials that harden over time. Although forming irregularities only on the top surface of the steel plate 11 makes processing easier, it is preferable to form irregularities on the entire surface.

[0047] In this embodiment, corresponding to claims 4 and 5, unevenness is formed on the black skin of the steel plate 11, which is the steel material used as the seaweed bed substrate for the seaweed bed reef 1, while leaving the black skin on the surface, so that the fine unevenness on the surface makes it easy for spores and seeds of seaweed and seaweed to adhere to the surface in the sea from the beginning of installation. Also, since the surface is roughened while leaving the black skin, there is no need to remove the black skin, and the surface has excellent adhesion of spores and seeds. Note that in this example as well, flat steel 12, angle steel 13, etc. can be used as the steel material.

[0048] As an effect of the following embodiment, since the steel material is treated by coating or spraying a paint primer or resin mortar, it is possible to treat the steel material after attaching it to the seaweed bed reef main body 2. EXAMPLES

[0049] 3 and 4 show Example 3 of the present invention, in which the same parts as those in the above-mentioned examples are given the same reference numerals and their explanations are omitted and will be described in detail. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been treated in Example 1 and / or Example 2.

[0050] In this example, the seaweed bed reef 1 uses flat steel bars 12 as the seaweed bed substrate, and multiple flat steel bars 12 with their thickness direction in the up-down direction are arranged side by side with their longitudinal directions facing in the same direction and spaced apart in the width direction at intervals 22, and placed on the upper surface of the upper frame 3. The intervals 22 are the gaps between the flat steel bars 12, 12. In this example as well, the flat steel bars 12, which are the seaweed bed substrate, are provided in the upper opening 3K, which is an opening, and this is the same in the following examples.

[0051] The flat steel bars 12 are attached and fixed to the upper surface of the seaweed bed reef main body 2 using the mounting members 21. The flat steel bars 12, 12 on both sides are fixed by a plurality of mounting members 21... placed at intervals over their entire length, and the flat steel bars 12... in the center are fixed by mounting members 21, 21 placed on both ends in the length direction. The flat steel bars 12 may be welded to the mounting members 21. In this example, the flat steel bars 12 are placed horizontally because their thickness direction is vertical. In this example, it is preferable to apply treatment to the entire surface of the flat steel bars 12.

[0052] In this way, this embodiment has the same effect as the above-mentioned embodiments, and further, in this embodiment, since there is a gap 22 between the flat bars 12, 12, young fish and the like can pass through this gap 22, resulting in a seaweed bed reef 1 in which fish tend to gather. EXAMPLES

[0053] 5 and 6 show Example 4 of the present invention, in which the same parts as those in the above-mentioned examples are given the same reference numerals and their explanations are omitted. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been subjected to the treatment of Example 1 and / or Example 2.

[0054] In this example of the seaweed bed reef 1, flat steel bars 12 are used as the seaweed bed substrate, and a number of flat steel bars 12 with their widths aligned vertically are placed on the upper surface of the upper frame 3 with their longitudinal directions facing in the same direction and spaced apart 22 in the width direction. The lower parts of the vertical pieces 21T of the mounting members 21 are embedded and fixed in the upper frame 3, and the flat steel bars 12 are fixed to the upper parts of the vertical pieces 21T and the horizontal pieces 21Y of the mounting members 21 by welding or the like.

[0055] Although not shown, the flat bars 12, 12 on both sides may be fixed with a plurality of mounting members 21 arranged at intervals over their entire length. In this example, the flat bars 12 are placed vertically because their width direction is the up-down direction. Also, a gap is provided between adjacent flat bars 12, 12.

[0056] In this manner, this embodiment provides the same effects as the above-described embodiments, and in this example, the flat steel 12 is fixed to the horizontal piece 21Y of the L-shaped mounting member 21 by welding or the like, so that the welded points form lines rather than points, resulting in a stable mounting structure. EXAMPLES

[0057] 7 and 8 show Example 5 of the present invention, in which the same parts as those in the above-mentioned examples are given the same reference numerals and their explanations are omitted. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been treated in Example 1 and / or Example 2.

[0058] In this example of the seaweed bed reef 1, angle irons 13 are used as the seaweed bed substrate, and multiple angle irons 13 are oriented in the same direction and arranged on the top surface of the upper frame 3 with slight intervals 22 in the width direction, and placed on the top surface with the corners of the angle irons 13 facing upwards. Note that, although an equilateral angle iron 13 is shown as an example, unequal arm angle irons may also be used.

[0059] The mounting member 21 is placed between adjacent angle irons 13 in the width direction, and the edges of the angle irons 13, 13 on both sides are welded and fixed to the horizontal piece portion 21Y of the mounting member 21, thereby fixing the angle irons 13 to the upper surface of the seaweed bed reef main body 2. The outer edges of the flat steel bars 12, 12 on both sides are fixed to the upper surface by welding their end sides to the horizontal piece portion 21Y of the mounting member 21. A gap corresponding to the thickness of the mounting member 21 is provided between adjacent angle irons 13, 13. It is preferable to treat the entire surface of the angle iron 13, and the same applies to the following examples.

[0060] In this way, this embodiment has the same effect as the above-mentioned embodiments, and in this example, by using angle iron 13 compared to flat iron 12, the surface area is increased, and further, since there is a corner between the two side pieces 13A, 13A, it becomes easier for spores, seeds, etc. to adhere. EXAMPLES

[0061] 9 and 10 show Example 6 of the present invention, in which the same parts as those in the above-mentioned examples are given the same reference numerals and their explanations are omitted and will be described in detail. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been treated in Example 1 and / or Example 2.

[0062] In this example of the seaweed bed reef 1, angle irons 13 are used as the seaweed bed substrate, and multiple angle irons 13 are oriented in the same direction and arranged side by side in the width direction on the top surface of the upper frame 3, with the corners of the angle irons 13 placed on the top surface facing downwards.

[0063] Also, the vertical piece 21T of the mounting member 21 is embedded and fixed in the upper frame 3 so as to sandwich the corner of the angle iron 13, and the horizontal piece 21Y of the mounting member 21 is welded and fixed to the undersides of the pieces 13A, 13A on both sides of the angle iron 13, thereby fixing the angle iron 13 to the upper surface of the seaweed bed reef main body 2. Also, a gap is provided between the edges of the pieces 13A, 13A of adjacent angle irons 13, 13.

[0064] In this manner, the present embodiment provides the same effects as the above-described embodiments. EXAMPLES

[0065] 11 and 12 show Example 7 of the present invention, in which the same parts as those in the above-mentioned examples are given the same reference numerals and their explanations are omitted and will be described in detail. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been treated in Example 1 and / or Example 2.

[0066] In this example of the seaweed bed reef 1, angle irons 13 are used as the seaweed bed substrate, and multiple angle irons 13 are oriented in the same direction and arranged side by side in the width direction on the upper surface of the upper frame 3, with one half 13A of the angle irons 13 oriented vertically and the other half 13A of the angle irons 13 oriented horizontally and placed on the upper surface of the seaweed bed reef main body 2.

[0067] The lower part of the vertical piece 21T of the mounting member 21 is buried and fixed in the upper frame 3, and the upper part of the vertical piece 21T and the horizontal piece 21Y of the mounting member 21 are fixed to one of the vertical pieces 13A by welding or the like, and the angle iron 13 is fixed to the upper surface of the seaweed bed reef main body 2. A gap is provided between adjacent angle irons 13, 13.

[0068] As a modified example, a hole (not shown) may be drilled in the other half 13A, an anchor bolt (not shown) fixed to the seaweed bed reef main body 2 with an insert may be inserted into the hole, and a nut (not shown) may be screwed onto the anchor bolt to fix the other half 13A to the upper surface, or a bolt member (not shown) inserted into the hole may be fixed to the seaweed bed reef main body 2, thereby fixing the angle iron 13, which serves as the seaweed bed substrate, to the seaweed bed reef main body 2.

[0069] In this manner, the present embodiment provides the same effects as the above-described embodiments. EXAMPLES

[0070] 13 to 17 show Example 8 of the present invention, in which the same parts as those in the above-mentioned respective examples are given the same reference numerals and their explanation will be omitted and will be described in detail. This example shows another example of a seaweed bed reef 1 using a seaweed bed substrate that has been subjected to the treatment of Example 1 and / or Example 2 above.

[0071] The seaweed bed reef main body 2, which is the frame body of this example, is formed by using a single steel frame unit 31 or by assembling a plurality of steel frame units 31. The steel frame unit 31 is formed by forming equal-sided angle irons 32, which are black steel material with a surface covered with black skin, into a substantially rectangular frame shape, and as shown in the exploded perspective view of Fig. 15, etc., includes an upper frame portion 33 having a planar rectangular shape, a lower frame portion 34 having a planar rectangular shape, and vertical pillar portions 35M, 35T, 35U and diagonal members 36M, 36T, 36U, 36MT, 36TU, 36TU that connect the upper frame portion 33 and the lower frame portion 34.

[0072] The upper frame portion 33 and the lower frame portion 34 are provided with left and right frame members 38L, 38R in the longitudinal direction, which are arranged in parallel with a gap in the left and right width direction, and front, center, and rear frame members 39M, 39T, 39U in the width direction, which are arranged at the longitudinal ends and longitudinal center of the left and right frame members 38, 38, and the ends of the front, center, and rear frame members 39M, 39T, 39U are connected and fixed to the left and right frame members 38L, 38R by welding or bolts and nuts. The upper frame portion 33 is provided with the front and rear upper openings 3K, 3K between the left and right frame members 38, 38 and the front, center, and rear frame members 39M, 39T, 39U. The lower frame portion 34 is provided with front and rear lower openings 4K, 4K.

[0073] The corners of the upper frame portion 33 and the lower frame portion 34 are connected by front and rear pillar portions 35M, 35M, 35U, 35U, and the longitudinal centers of the upper frame portion 33 and the lower frame portion 34 are connected by central pillar portions 35T, 35T.

[0074] The lower and upper sides of the left and right front column sections 35M, 35M are connected by a diagonal member 36M, the lower and upper sides of the left and right center column sections 35T, 35T are connected by a diagonal member 36T, and the upper and lower sides of the left and right rear column sections 35U, 35U are connected by a diagonal member 36U. Furthermore, the lower and upper sides of the right front and right center column sections 35M, 35T are connected by a diagonal member 36MT, and the upper and lower sides of the right center and right rear column sections 35T, 35U are connected by a right diagonal member 36TU. The lower and upper sides of the left center and left rear column sections 35T, 35U are connected by a left diagonal member 36TU. In addition, instead of directly connecting the column portion and the diagonal member, for example, as shown in Figure 15, the lower end of the right front column portion 35M and the lower end of the diagonal member 36MT may be connected to the right frame member 38R of the lower frame portion 34, thereby connecting the lower side of the right front column portion 35M and the lower side of the diagonal member 36MT.

[0075] The upper and lower ends of the diagonal members 36M, 36T, 36U, 36MT, 36TU, and 36TU are also connected to the upper frame portion 33 and the lower frame portion 34. The angle irons 32, 32 can be connected by welding, bolts and nuts, or the like.

[0076] In this example, the angle irons 13 are used as the seaweed bed substrate, and multiple angle irons 13 are oriented in the same direction as the width direction of the steel frame unit 31 on the upper surface of the steel frame unit 31, and are arranged side by side in the longitudinal direction of the steel frame unit 31, and are placed on the upper surface of the upper frame body 3 so that the corners of the angle irons 13 face upward. Although an equal-sided angle iron 13 is shown as an example, unequal-sided angle irons may also be used. The angle irons 13 in this example are also a seaweed bed substrate that has been subjected to the treatment of Example 1 and / or Example 2 above.

[0077] Moreover, each angle iron 13 is fixed to the upper surface of the upper frame 3 by welding or the like. When using steel material whose surface has been roughened while leaving the black scale on the surface, as in Example 2, the black scale may be removed only at the welding points of the steel material before welding, or the steel material may be fixed to the upper surface by other mounting members. Also, it is preferable to partially remove the black scale from the welding points of the steel frame unit 31 to the angle iron 13 before welding.

[0078] In addition, the steel plate 11, flat steel 12 and angle steel 13 shown in each of the above embodiments can be used, and further, the angle steel 13 can be used in a V-shaped or L-shaped orientation as shown in embodiments 6 and 7.

[0079] 13 and 17, the four steel frame units 31, 31, 31, 31 are arranged so that half a space K is formed between them on the plane of the steel frame unit 31, and adjacent steel frame units 31, 31, 31, 31 are connected to form the seaweed bed reef 1. In this case, diagonal members 36M, 36MT, 36TU are positioned on the side of the seaweed bed reef 1, ensuring the strength of the seaweed bed reef 1 as a whole.

[0080] In this way, in this embodiment, the angle iron 13, which is a steel material that has been treated using the method for treating a seaweed bed substrate, is used, and the angle iron 13, which is a steel material, is attached to the seaweed bed reef main body 2, which is a steel frame, so that the same effects as those of the above-mentioned embodiments are achieved.

[0081] Also, in this example, the steel frame unit 31 which is the seaweed bed reef main body 2 is made of angle iron 32 with black skin, so as the second and third years pass after installation, the surface of the steel frame unit 31 becomes rough, and the number of places where spores and the like can adhere increases, resulting in the adhesion of many spores, etc. Furthermore, since the angle iron 13 can be attached to the steel frame unit 31 by welding, no attachment members are required, and since no attachment members are used, the angle iron 13 can be arranged without gaps in the width direction.

[0082] The present invention is not limited to the above-mentioned embodiments, and various modifications are possible within the scope of the invention. For example, the structure for attaching the steel material to the seaweed bed reef main body can be appropriately selected. In addition, various steel materials such as round or square steel pipes, H-shaped steel, etc. can be used other than those shown in the embodiments. In addition, the seaweed bed reef main body may be made of synthetic resin or a combination of various materials other than steel or concrete, and the shape of the seaweed bed reef main body is not limited to a frame shape and various shapes can be used. It is preferable that the seaweed bed reef main body has an upper opening and that a seaweed bed substrate is provided in this upper opening. In addition, although an L-shaped mounting member is shown in each embodiment, a rod-shaped mounting member may be used, and mounting members of other shapes and structures may be used. Furthermore, as shown in the embodiment, the steel material which is the seaweed bed substrate can be attached to the upper stage of the seaweed bed reef body which is a frame made of iron, concrete, etc. by welding, pin-shaped mounting members 21, anchors, etc. if it is a steel plate 11, or by placing flat steel 12 horizontally or vertically and attaching it by welding, pin-shaped mounting members 21, anchors, etc. if it is an angle iron 13, placing it in an L-shape, mountain shape, or valley shape and attaching it by welding, pin-shaped mounting members 21, anchors, etc. In claim 2, at least one of shot blasting, sand blasting, wire brushes, cup wires, disc sanders, and barrels can be used. [Explanation of symbols]

[0083] 1 Seagrass reef 2 Seaweed bed reef body (frame) 11 Steel plate (steel material, seaweed bed substrate) 12 Flat steel (steel material, seaweed bed substrate) 13 Angle steel (steel material, seaweed bed matrix) 31 Steel frame unit (frame body)

Claims

1. A method for treating a substrate for a seaweed bed, comprising removing the black skin from the surface of a steel material used as a substrate for a seaweed bed reef, and then corroding the surface.

2. 2. A method for treating a seaweed bed substrate according to claim 1, characterized in that any one of shot blasting, sand blasting, wire brushing, cup wire, disc sander and barrel sander is used to remove the black skin.

3. 2. The method for treating a seaweed bed substrate according to claim 1, characterized in that a chemical is used to remove the black skin.

4. A method for treating a substrate for a seaweed bed, comprising forming irregularities on the black skin of a steel material used as a substrate for a seaweed bed reef while leaving the black skin on the surface of the steel material.

5. A seaweed bed reef, comprising a steel material treated by the method for treating a seaweed bed substrate according to any one of claims 1 to 4, and the steel material is attached to a seaweed bed reef main body.

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