JP2011205957A - Tool for preventing feeding damage on marine algae, and concrete block with feeding damage-preventing function on marine algae - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for preventing feeding damage on marine algae capable of constructing seaweed beds in an early period by defending the growing points of the marine algae from the feeding by vegetable eating fish by an economical method in a good efficiency, and concrete blocks with a feeding-preventing function on the sea algae.SOLUTION: This tool for preventing the feeding damage on marine algae is configured to include a central shaft part 2 and a plurality pieces of protruding parts 3, and the protruding parts 3 are constituted so that each of adjacent protruding parts 3 protrudes with each other radially from the central shaft part 2 by taking an angle interval of 45 to 120° around the longitudinal axial line C of the central shaft part 2, and also protrudes within a range of 45 to 135° toward the longitudinal axial line C of the central shaft part 2.

Description

  TECHNICAL FIELD The present invention relates to a food damage prevention device for preventing seaweed from being killed by fish damage and a concrete block having a function of preventing seaweed damage.

  As a method to prevent the damage of seaweed, the whole seaweed to be protected or the seedling bed of algae is surrounded by a net to prevent the invasion of herbivores and other herbivores. There is also known a method for preventing damage by tying fibers to the growth point of seaweed. Also known is a method of arranging a repellent such as sea urchin or abalone or a food damage prevention tool having radial spines around the seaweed to be protected.

JP-A-11-137118 JP 2002-335784 A JP-A-9-285250 JP 2007-244260 A

  However, the food damage prevention method of enclosing the whole seaweed or the algae nursery bed with a net has problems in terms of durability (wave resistance) and economy. Specifically, if the struts that support the net have a simple configuration, they are easily damaged in a short period of time by waves and tides, and the base is not sufficiently fixed to the sea floor. There is a problem that it will be washed away from the installation location. On the other hand, trying to obtain sufficient durability increases the cost of materials and installation work, and when trying to implement on a large scale, apart from conducting experiments on a small scale, From the economic point of view, realization is difficult.

  In addition, the method of preventing damage by tying fibers to the growth points of seaweeds is very inefficient because workers have to work to tie fibers to each seaweed that they want to protect. In particular, there is a problem that an economic burden becomes large when a wide range of algae beds are constructed. Further, since the position of the growth point of seaweed varies depending on the type, it is unclear whether this method can be applied to seaweeds other than the salamander, arame, kajime, and kurome of the Kombu family.

  Furthermore, any of the conventional methods for preventing damage to food as described above has a problem that it takes much time and labor to perform maintenance and management, and costs increase. For example, when seaweed is surrounded by a net, adherent organisms such as miscellaneous seaweed and shellfish adhere to the net with the passage of time, and there is a high probability that the net is blocked by these adherent organisms. If this is left untreated, the seaweed to be protected will die due to lack of sunshine, and it is necessary to periodically remove these attached organisms.

  In addition, in the method of placing repellents such as sea urchins and abalone around the seaweed to be protected, the repellents are released into the seawater, so the repellents must be constantly replenished to maintain the effect. In addition, in the method of arranging an anti-corrosion device having radial spines, the gap between the spines is narrow, so that the gap is filled with floating mud, adhering organisms, etc. In order to maintain the intrusion prevention effect, periodic cleaning and replacement work is required. As described above, the conventional method for preventing damage to food has a problem in that a complicated work is required for maintenance, and the cost for the method is increased.

  The present invention has been made to solve the above-described problems, and is capable of early algae by efficiently and economically protecting seaweed growth points from herbivorous fish supplements. An object of the present invention is to provide a seaweed damage prevention device and a concrete block with a seaweed damage prevention function capable of creating a place.

  The seaweed food damage prevention device according to the present invention includes a central shaft portion and a plurality of protrusions, and the protrusions are 45 ° to 120 ° adjacent to each other around the longitudinal axis of the central shaft portion. It is configured to project radially from the central shaft portion at an angular interval and to project within a range of 45 ° (diagonally upward) to 135 ° (diagonally downward) with respect to the longitudinal axis of the central shaft portion. It is characterized by being.

  In addition, it can also comprise so that the vertical part extended in the direction of the range of the vertical +/- 20 degree may be connected and hold | maintained at a projection part. In addition, hook-shaped protrusions with the distal end portion bent with respect to the proximal end portion are employed, and further, these hook-shaped protrusions are arranged around the longitudinal axis of the central shaft portion to protrude like a hook. It can also be configured to.

  Alternatively, a plurality of protrusions may be arranged in two or more stages in the vertical direction so that the protruding direction of the upper protruding part is different from the protruding direction of the lower protruding part.

  Moreover, the concrete block with the seaweed damage prevention function according to the present invention is formed by fixing a plurality of seaweed food damage prevention tools on the top end surface or on an upward inclined surface, The protrusion is composed of a central shaft portion and a plurality of protrusions, and the adjacent protrusions are radially spaced from the central shaft portion with an angular interval of 45 ° to 120 ° around the longitudinal axis of the central shaft portion. It is characterized by projecting in the range of 45 ° (diagonally upward) to 135 ° (diagonally downward) with respect to the longitudinal axis of the central shaft portion.

  In this concrete block, a food damage prevention device having a vertical portion (outer food damage prevention device) is arranged at the outermost position on the top end surface, and a food damage that does not have a vertical portion at a position inside the concrete block. It is good also as a structure which arrange | positions a prevention tool (inner food damage prevention tool).

  The seaweed damage prevention device according to the present invention and the seaweed prevention block with a function of preventing seaweed damage can suitably protect the growth points of seaweed from herbivorous fish, and can be used to recover seaweed beds in the seaweed sea area due to food damage. It is very effective. In addition, since the installation work can be performed on land, the work can be done efficiently, and basically no diving work is required, and the cost related to installation work can be greatly reduced, resulting in excellent economic efficiency. ing. In addition, the seaweed food damage prevention device according to the present invention can be attached to a rooting block already installed on the sea floor by diving work, and in this case, it is not necessary to manufacture a new block. Can be reduced and is economically superior.

FIG. 1 is a perspective view of a seaweed food damage prevention apparatus 1 (first embodiment) according to the present invention. FIG. 2 is a perspective view showing another configuration example of the seaweed food damage prevention device 1 according to the present invention. FIG. 3 is an explanatory diagram (a perspective view of the root block 5) of the method of using the food damage prevention tool 1 of FIG. 1 (second embodiment). FIG. 4 is a perspective view of a seaweed food damage prevention device 1 (third embodiment) according to the present invention, FIG. 4 (1) is a perspective view of an outer food damage prevention device 1a, and FIG. It is a perspective view of the food damage prevention tool 1b for inner side. FIG. 5 is an explanatory diagram (plan view of the root block 5) of the method of using the food damage prevention device 1 of FIG. 4 (fourth embodiment). FIG. 6 (1) is a diagram showing only the outer anti-corrosion tool 1a among the anti-corrosion tools 1 arranged on the top end surface 5a of the root block 5 of FIG. 5, and FIG. It is the figure which displayed only the inner food damage prevention tool 1b. FIG. 7 is a perspective view of a seaweed food damage prevention device 1 (fifth embodiment) according to the present invention, FIG. 7 (1) is a perspective view of an outer food damage prevention device 1a, and FIG. It is a perspective view of the food damage prevention tool 1b for inner side. FIG. 8 is an explanatory diagram (plan view of the root block 5) of the method of using the food damage prevention tool 1 of FIG. 7 (sixth embodiment). FIG. 9 (1) is a diagram showing only the outer anti-corrosion tool 1a among the anti-corrosion tools 1 arranged on the top end surface 5a of the root block 5 of FIG. 8, and FIG. It is the figure which displayed only the inner food damage prevention tool 1b. FIG. 10 is a perspective view of a seaweed food damage prevention device 1 (seventh embodiment) according to the present invention, and FIG. 10 (1) is a perspective view of a narrow type food damage prevention device 1c, FIG. 10 (2). These are perspective views of wide type food damage prevention implement 1d. FIG. 11 is an explanatory diagram (plan view of the root block 5) of the method of using the food damage prevention tool 1 of FIG. 10 (eighth embodiment). FIG. 12 (1) is a diagram showing only the narrow type of food damage prevention tool 1c among the food damage prevention tools 1 arranged on the top end surface 5a of the root block 5 of FIG. 11, and FIG. FIG. 5 is a view showing only the wide type food damage prevention tool 1d.

Embodiments of the “seaweed food damage prevention device” and the “root hardening block” of the present invention will be described below with reference to the accompanying drawings.
First, as a first embodiment of the present invention, a seaweed food damage prevention device 1 will be described. As shown in FIG. 1, the seaweed food damage prevention device 1 according to this embodiment includes a central shaft portion 2, a plurality of protrusions 3, and a flat base 4.

  In the present embodiment, these are all made of metal, but can also be made of hard rubber or plastic. As shown in the drawing, the central shaft portion 2 is erected upward from the center of the base 4 in a direction in which the longitudinal axis C is perpendicular to the surface of the base 4.

  The projecting portions 3 are radially provided around the longitudinal axis C of the central shaft portion 2. The configuration of the projection 3 will be described in more detail. Four projections 3 are arranged in a total of 16 in a vertical direction in four stages. Among these, the four protrusions 3 of the first stage (uppermost stage) S1 are all protruded in the direction of 90 ° with respect to the longitudinal axis C of the center axis part 2 (the center axis part 2 is When the anti-corrosion tool 1 is installed so as to be vertical, the protrusions 3 protrude in the horizontal direction), and the adjacent protrusions 3 are spaced by 90 ° around the longitudinal axis C. It is comprised so that it may protrude. The projection 3 of the second stage S2 and the projection 3 of the third stage S3 are the same as the first stage.

  The protrusions 3 of the fourth step (lowermost step) S4 are configured so that adjacent protrusions 3 protrude around the longitudinal axis C with an angular interval of 90 °. Although it is the same as the projection part 3 of S1 (... 3rd step S3), it is comprised so that it may protrude in the 45 degree direction (diagonal upper direction) with respect to the longitudinal axis C of the center axis | shaft part 2. FIG. The projections 3 of the first stage S1 to the third stage S3 are mainly for the purpose of protecting seaweeds from adult herbivorous fish, and the projections 3 of the fourth stage S4 are particularly seaweed juveniles. The purpose is to protect the buds.

  In the present embodiment, the protrusions 3 of the first stage S1 to the third stage S3 are configured to protrude in the direction of 90 ° with respect to the longitudinal axis C of the central shaft part 2. Similarly to the projection 3 of the fourth stage S4, the projection may be configured to protrude in a 45 ° direction (diagonally upward) with respect to the longitudinal axis C of the central shaft portion 2 (see FIG. 2). Or you may comprise so that it may protrude to 135 degrees (diagonally downward). Further, the angle of the protrusion 3 with respect to the longitudinal axis C is not limited to 90 °, 45 ° (diagonally upward), and 135 ° (diagonally downward), but is 45 ° (diagonally upward) to 135 ° (diagonally below). It can set suitably in the range.

  The normal feeding posture of herbivorous fish is 45 ° downward (the spinal cord is at an angle of approximately 45 ° and the mouth is obliquely downward) to 45 ° upward (the spinal cord is at an angle of approximately 45 ° obliquely, In many cases, the angle of the protrusion 3 is set to 45 ° with respect to the longitudinal axis C of the central shaft portion 2 according to the normal feeding posture of the herbivorous fish. By setting within a range of (obliquely upward) to 135 ° (diagonally downward), feeding behavior of herbivorous fish can be suitably prevented.

  Further, the angular interval around the longitudinal axis C between the adjacent protrusions 3 can be appropriately set within a range of 45 ° to 120 °. If the angle interval is smaller than 45 °, accumulation of floating mud and attached organisms increase, and the gaps between the protrusions 3 are likely to be filled. When the gaps between the protrusions 3 are filled, sunlight necessary for seaweed is blocked. There is a problem of end. In addition, there is a problem that herbivorous animals other than fish (sea urchins, shellfish, etc.) are likely to adhere and become hazy. On the other hand, when it is larger than 120 °, there is a problem that the invasion of herbivorous fish cannot be suitably prevented.

  In the food damage prevention device 1 of the present embodiment, since the angular interval around the longitudinal axis C between adjacent protrusions 3 is set to 90 °, the invasion of herbivorous fish is suitably prevented and the food damage of seaweed is prevented. It is possible to avoid problems such as accumulation of floating mud and clogging of the protrusions 3 due to attached organisms. As a result, maintenance is almost unnecessary, and the cost for this can be reduced, and the economy is excellent. .

  In addition, about the height dimension of the center axis | shaft part 2, the protrusion dimension of the projection part 3, and the space | interval dimension of each step, it depends on the kind of seaweed to protect, and the kind and size of the target herbivorous fish Set the appropriate dimensions.

  For example, for perennial seaweeds (such as sawtooth mom and mametawala) in the family Hawkoniaceae, each year, by preventing the growth points of the perennial sites (stems and appendages) that remain after the main branches are washed away, the death is avoided. Therefore, it is considered that it can be suitably protected, and for that purpose, it is considered necessary to set the height of the food damage prevention tool 1 to 20 cm or more. In addition, for the annual seaweeds (Akamoku, etc.) of the sea buckthorn, all the alga bodies die and flow out every year, so it is only necessary to protect the growth points of the young buds. About 10cm is enough. Since the growth point is 1 place and the height is about 30 to 40 cm from the bottom, the height of the food damage prevention tool 1 needs to be set to 40 cm or more in accordance with this. . In the kombu macomb and honey comb, etc., the growth point is one and located at a height of 10 to 20 cm from the bottom. Therefore, the height of the food damage prevention tool 1 needs to be set to 20 cm or more accordingly. .

  The protrusion dimension of the protrusion 3 is determined by the body length of the target herbivorous fish. This is to determine the spacing between the food damage prevention tools 1 according to the body length of the target fish. The interval dimension of each stage is set to be narrower than the height of the target fish. Further, the number of protrusions 3 and the number of steps are not limited to the example in FIG. 1 and can be appropriately changed depending on the type of seaweed to be protected.

  Moreover, in this embodiment, although the center axis | shaft part 2 is comprised by prismatic shape, a cross-sectional shape is not specifically limited, It can also be set as the shape of a column shape or a deformed cross section. Further, the cross-sectional shape of the protrusion 3 is not limited, and may be a cylindrical shape as illustrated, a prismatic shape such as the central shaft portion 2, or a tapered shape or a tapered shape. You can also. In particular, in the seaweeds of the Kombuidae, if the friction between the tip of the central shaft part of the food damage prevention device and the tip of the projection and the leaf part of the seaweed occurs due to waves or currents, there is a risk of damaging the seaweed leaf part. Protective material can also be attached.

  The four protrusions 3 in each stage (first stage S1 to fourth stage S4) have the same height position, but the height positions do not necessarily have to be the same. You may shift an installation position to the up-down direction between the adjacent projection parts 3. FIG.

  Next, as a second embodiment of the present invention, an example of how to use the food damage prevention tool 1 of the first embodiment (a rooting block 5 to which the food damage prevention tool 1 is applied) will be described. For example, as shown in FIG. 3, a large number of food damage prevention tools 1 are installed on the top end surface 5a of the concrete tamping block 5 so that the central shaft portion 2 is perpendicular to the top end surface 5a. In addition, you may attach not only to the top end surface 5a but to the upward inclined surface 5b. The interval and the number of installations of the food damage prevention tools 1 are appropriately set according to the type of seaweed to be protected and the type and size of the target herbivorous fish.

  When a large number of food damage prevention tools 1 are installed on the top end surface 5a of the root consolidation block 5 or the upward inclined surface 5b, a region where the herbivorous fish cannot enter is formed in the space above the root consolidation block 5, and as a result. Thus, it is possible to suitably prevent the damage caused by the herbivorous fish in the grown seaweed 6 that germinates on the top end surface 5a of the root hardening block 5 or on the upward inclined surface 5b.

  In addition, the attachment operation | work of the food damage prevention tool 1 with respect to the root hardening block 5 can be performed onshore at the time of manufacture of the root hardening block 5. FIG. More specifically, concrete is placed in a mold for forming the root block 5, and then, before the concrete is hardened, the base 4 shown in FIG. The portion below the fourth stage protrusion 3 is embedded in the concrete that forms the top end surface 5a (or the inclined surface 5b) of the root hardening block 5, and the concrete is hardened. Moreover, the base 4 of the food damage prevention tool 1 can also be attached to the top end surface 5a (or the inclined surface 5b) of the already-prepared root block 5 using an adhesive or mortar.

  Further, the base 4 of the food damage prevention tool 1 shown in FIG. 1 is omitted, and the dimension of the lowermost part of the central shaft part 2 (the part below the fourth-stage protrusion 3) is set to be long so that the existing root A hole is drilled in the top end surface 5a (or inclined surface 5b) of the compaction block 5, the lowermost part of the central shaft portion 2 is inserted therein, and the food damage prevention tool 1 is solidified using an adhesive or mortar. 5 may be fixed.

  In this way, when the damage prevention tool 1 is attached to the root block 5 and installed on the seabed, sufficient wave resistance stability can be ensured. Moreover, since the installation work can be performed on land, the diving work is not necessary, and the cost related to the installation work can be greatly reduced. Furthermore, when attaching to the existing root block 5, there is no need to newly install the block, and versatility and economy are high.

  Moreover, this food damage prevention tool 1 can protect the growth point of a seaweed intensively rather than defending the whole algal body. In order to protect the whole alga body, it is necessary to surround the whole with a cage or a net, etc., which is problematic in terms of economy and wave resistance, but if the growth point is protected, other parts are preyed However, since the tissue is regenerated, it is possible to efficiently and economically prevent seaweed damage. In addition, in this embodiment, although the example which applied the anti-corrosion tool to the rooting block was demonstrated, concrete blocks other than a rooting block (wave-dissipating block or a general-purpose concrete block, concrete board, etc.) It can also be applied to.

  Next, as a third embodiment of the present invention, a seaweed food damage prevention device 1 will be described. As shown in FIG. 4, the seaweed food damage prevention tool 1 (outer food damage prevention tool 1 a, inner food damage prevention tool 1 b) according to the present embodiment has a central shaft portion 2, a plurality of protrusions 3, and a flat plate shape. The central shaft portion 2 is erected upward from the center of the base 4 in a direction in which the longitudinal axis is perpendicular to the surface of the base 4.

  In the outer food damage prevention tool 1a shown in FIG. 4 (1), the protrusions 3 are radially provided around the longitudinal axis of the central shaft 2. More specifically, a total of 12 protrusions 3 are arranged in three stages in the vertical direction. All of these protrusions 3 protrude in the direction of 90 ° with respect to the longitudinal axis of the central shaft portion 2, and adjacent protrusions 3 are 90 ° around the longitudinal axis of the central shaft portion 2. It is configured to protrude at an angular interval. Moreover, this damage prevention tool 1 a has one vertical portion 7 in addition to the protruding portion 3. The vertical portion 7 includes one protrusion 3a at the first stage, a second protrusion 3b positioned below the protrusion, and a tip of the third protrusion 3c positioned below the protrusion 3a. And are held so as to extend substantially vertically (in the direction of a range of vertical ± 20 °).

  The lengths of the protrusions 3 of the outer food damage prevention device 1a are all set to 10 cm. Further, the length (height) of the central shaft portion 2 is set to 27 cm. The distance between the surface of the base 4 and the third-stage protrusion 3 is 5 cm at the shaft base, the distance between the third-stage protrusion 3 and the second-stage protrusion 3, and the third-stage protrusion 3. The distance between the protrusion 3 and the second protrusion 3 is set to 10 cm on the shaft base.

  4 (2) has a plurality of protrusions 3 projecting radially around the longitudinal axis of the central shaft portion 2 in the same manner as the damage prevention device 1a shown in FIG. 4 (1). Yes. More specifically, a total of eight protrusions 3 are arranged in two stages in the vertical direction. These protrusions 3 protrude in the direction of 90 ° with respect to the longitudinal axis of the central shaft portion 2, and adjacent protrusions 3 are spaced by 90 ° around the longitudinal axis of the central shaft portion 2. It is comprised so that it may protrude after.

  The lengths of the protrusions 3 of the inner food damage prevention device 1b are all set to 10 cm. Further, the length (height) of the central shaft portion 2 is set to 27 cm. The distance between the surface of the base 4 and the second-stage protrusion 3 is 5 cm at the axis base, and the distance between the second-stage protrusion 3 and the first-stage protrusion 3 is 20 cm at the axis base. Is set to

  Next, as a fourth embodiment of the present invention, an example of how to use the food damage prevention device 1 (outer food damage prevention device 1a, inner food damage prevention device 1b) of the third embodiment (outer food damage prevention device 1a). The root block 5) to which the inner food damage prevention device 1b is applied will be described. For example, as shown in FIG. 5, a large number of outer anti-corrosion devices 1a and inner anti-corrosion devices 1b are provided on the top end surface 5a of the concrete rooting block 5, and the central shaft portion 2 is provided on the top end surface 5a. They are installed so as to be perpendicular to each other and in the same direction (extending direction of each protrusion 3).

  In addition, the outer food damage prevention tool 1a and the inner food damage prevention tool 1b are each provided with a certain reference point P (see FIG. 5) at the tip of each protrusion 3 of each of the four food damage prevention tools 1. As the center, an equal angular interval (90 °) around the periphery, and an equal distance interval (the interval between the tips of the protrusions 3 facing each other across the reference point P is 5 cm, and the interval between the central shaft portions 2 is 25 cm. According to the arrangement pattern of matching, the arrangement is made regularly. Further, among them, an outer anti-corrosion tool 1a is disposed at the outermost position (near the outer peripheral edge of the top end surface 5a) (see FIG. 6 (1)), and the inner side (the center of the top end surface 5a). The inner food damage prevention device 1b is disposed at a position near the portion (see FIG. 6 (2)).

  Further, as shown in FIG. 6 (1), the outer portion of the outer food damage prevention tool 1a is oriented in such a way that the vertical portion 7 is positioned close to the tip of the projection 3 of the other adjacent outer food damage prevention device 1a. And it arrange | positions so that it may become the direction which the perpendicular | vertical parts 7 of the adjacent external food damage prevention tools 1a do not adjoin.

  When the outer food damage prevention device 1a and the inner food damage prevention device 1b shown in FIG. 4 are arranged as shown in FIGS. 5 and 6, vegetative fish (especially having a body height of 10 cm or more and a body width of 5 cm or more). Fish) can be prevented from entering the region on the top end surface 5a from the outer peripheral side of the root consolidation block 5 and from above, and germinate and grow on the top end surface 5a of the root consolidation block 5 It is possible to suitably prevent damage caused by herbivorous fish in seaweed.

  In addition, the attachment work of the anti-corrosion tool 1 to the root hardening block 5 is performed by placing concrete in a mold for forming the root hardening block 5 and thereafter hardening the concrete, as in the second embodiment. 4, the base 4 shown in FIG. 4 and the lowermost part of the central shaft portion 2 (a portion extending 2 cm above the surface of the base 4) are embedded in the concrete forming the top end face 5 a of the root block 5. Then, the concrete is hardened by embedding so that the height dimension from the surface of the placed concrete to the lowermost protrusion 3 of the corrosion prevention device 1 is 3 cm.

  Next, as a fifth embodiment of the present invention, a seaweed food damage prevention device 1 will be described. As shown in FIG. 7, the seaweed food damage prevention device 1 (outer food damage prevention device 1a, inner food damage prevention device 1b) of the present embodiment has a distal end portion with respect to the central shaft portion 2 and the proximal end portion. A plurality of hook-shaped protrusions 3 bent at right angles to the horizontal direction and a flat base 4 are formed. The central shaft portion 2 is oriented so that its longitudinal axis is perpendicular to the surface of the base 4. It is erected upward from the center of 4.

  In the outer anti-corrosion tool 1a shown in FIG. 7 (1), the hook-shaped protrusions 3 are provided radially (in a hook shape) around the longitudinal axis of the central shaft portion 2. More specifically, a total of twelve hook-shaped protrusions 3 are arranged in three stages in the vertical direction. Each of these protrusions 3 has a proximal end portion protruding in a direction of 90 ° with respect to the longitudinal axis of the central shaft portion 2, and the proximal end portions of the adjacent protruding portions 3 are center axes. The portion 2 is configured to protrude at an angular interval of 90 ° around the longitudinal axis.

  The lengths of the proximal end portion and the distal end portion of the protrusion 3 of the outer anti-corrosion tool 1a are both set to 10 cm. Further, the length (height) of the central shaft portion 2 is set to 27 cm. The distance between the surface of the base 4 and the third-stage protrusion 3 is 5 cm at the shaft base, the distance between the third-stage protrusion 3 and the second-stage protrusion 3, and the third-stage protrusion 3. The distance between the protrusion 3 and the second protrusion 3 is set to 10 cm on the shaft base.

  7 (2), as in the case of the food damage prevention device 1a shown in FIG. 7 (1), the hook-shaped protrusions 3 are radially formed around the longitudinal axis of the central shaft portion 2 (卍). Protruding). More specifically, a total of eight protrusions 3 are arranged in two stages in the vertical direction. Each of these protrusions 3 has a proximal end portion protruding in a direction of 90 ° with respect to the longitudinal axis of the central shaft portion 2, and the proximal end portions of the adjacent protruding portions 3 are center axes. The portion 2 is configured to protrude at an angular interval of 90 ° around the longitudinal axis.

  The lengths of the proximal end portion and the distal end portion of the protrusion 3 of the inner food damage prevention tool 1b are both set to 10 cm. Further, the length (height) of the central shaft portion 2 is set to 27 cm. The distance between the surface of the base 4 and the second-stage protrusion 3 is 5 cm at the axis base, and the distance between the second-stage protrusion 3 and the first-stage protrusion 3 is 20 cm at the axis base. Is set to

  Next, as a sixth embodiment of the present invention, an example of how to use the food damage prevention device 1 (outer food damage prevention device 1a, inner food damage prevention device 1b) of the fifth embodiment (outer food damage prevention device 1a). The root block 5) to which the inner food damage prevention device 1b is applied will be described. For example, as shown in FIG. 8, a large number of outer anti-corrosion devices 1a and inner anti-corrosion devices 1b are provided on the top end surface 5a of the concrete rooting block 5, and the central shaft portion 2 is provided on the top end surface 5a. They are installed so as to be perpendicular to each other and in the same direction (extending direction of each protrusion 3).

  In addition, the outer side anticorrosion tool 1a and the inner side anticorrosion tool 1b are arranged in parallel in the extending direction on the base end side of the protruding portion 3 and at equal distance intervals (the protruding portion 3 of the adjacent eating damage preventing device 1). Are arranged in a lattice pattern so that the distance between the tips of the two is 5 cm and the distance between the central shaft portions 2 is 25 cm. Further, among them, the outer anti-corrosion tool 1a is disposed at the outermost position (near the outer peripheral edge of the top end surface 5a) (see FIG. 9 (1)), and the inner side (the center of the top end surface 5a). The inner food damage prevention device 1b is disposed at the position near the section (see FIG. 9 (2)).

  When the outer food damage prevention device 1a and the inner food damage prevention device 1b shown in FIG. 7 are arranged as shown in FIGS. 8 and 9, vegetative fish (especially having a body height of 10 cm or more and a body width of 5 cm or more). Fish) can be prevented from entering the region on the top end surface 5a from the outer peripheral side of the root consolidation block 5 and from above, and germinate and grow on the top end surface 5a of the root consolidation block 5 It is possible to suitably prevent damage caused by herbivorous fish in seaweed.

  In addition, the attachment work of the anti-corrosion tool 1 to the root hardening block 5 is performed by placing concrete in a mold for forming the root hardening block 5 and thereafter hardening the concrete, as in the second embodiment. 7, the base 4 shown in FIG. 7 and the lowermost portion of the central shaft portion 2 (the portion extending 2 cm above the surface of the base 4) are embedded in the concrete forming the top end face 5 a of the root block 5. Then, the concrete is hardened by embedding so that the height dimension from the surface of the placed concrete to the lowermost protrusion 3 of the corrosion prevention device 1 is 3 cm.

  Next, as a seventh embodiment of the present invention, a seaweed food damage prevention device 1 will be described. As shown in FIG. 10, the seaweed food damage prevention device 1 (narrow-type food damage prevention device 1 c, wide-type food damage prevention device 1 d) according to this embodiment includes a central shaft portion 2, a plurality of protrusions 3, and a flat plate. The central shaft portion 2 is erected upward from the center of the base 4 in a direction in which the longitudinal axis is perpendicular to the surface of the base 4.

  In the narrow type food damage prevention tool 1c shown in FIG. 10 (1) and the wide type food damage prevention tool 1d shown in FIG. 10 (2), the protrusions 3 project radially around the longitudinal axis of the central shaft part 2. ing. More specifically, a total of eight protrusions 3 are arranged in two steps in the vertical direction. All of these protrusions 3 protrude in the direction of 90 ° with respect to the longitudinal axis of the central shaft portion 2, and adjacent protrusions 3 are 90 ° around the longitudinal axis of the central shaft portion 2. It is configured to protrude at an angular interval. The protruding direction of the upper four protruding portions 3 and the protruding direction of the lower four protruding portions 3 are different by 45 °.

  The lengths of the protrusions 3 of these anti-corrosion devices 1 are all set to 10 cm, and the length (height) of the central shaft portion 2 is set to 27 cm. The distance between the surface of the base 4 and the lower protrusion 3 is set to 5 cm on the shaft base. Moreover, the space | interval of the lower projection part 3 and the upper projection part 3 of the narrow type | mold food damage prevention tool 1c is narrower than the wide type food damage prevention tool 1d, and is set to 10 cm with an axial base, and the wide type food damage prevention tool 1d. The distance between the lower protrusion 3 and the upper protrusion 3 is wider than that of the narrow-type anti-corrosion prevention device 1c, and is set to 20 cm on the shaft core base.

  Next, as an eighth embodiment of the present invention, an example of how to use the food damage prevention tool 1 (the narrow type food damage prevention tool 1c, the wide type food damage prevention tool 1d) of the seventh embodiment (the narrow type food damage prevention) The root hardening block 5) to which the tool 1c and the wide type damage prevention tool 1d are applied will be described. For example, as shown in FIG. 11, a large number of narrow type food damage prevention tools 1c and wide type food damage prevention tools 1d are provided on the top end surface 5a of the concrete rooting block 5, and the central shaft portion 2 has the top end surface 5a. And the direction of the upper protrusion 3 of the narrow anti-corrosion tool 1c and the direction of the lower protrusion 3 of the wide anti-corrosion tool 1d are all aligned (or narrow). The direction of the protrusion 3 at the lower stage of the mold corrosion prevention tool 1c and the direction of the protrusion 3 at the upper stage of the wide mold damage prevention tool 1d are all installed.

  These food damage prevention tools 1 are arranged in parallel in the extending direction of the upper protrusion 3 or the lower protrusion 3 of one reference food damage prevention tool 1 at equal distance intervals (adjacent food damage prevention tools 1 Are arranged in a grid pattern so that the distance between the central axis portions 2 is 17 cm. Regardless of whether it is the outside or the inside, the narrow type food damage prevention device 1c and the wide type food damage prevention device 1d are alternately arranged so that the narrow type food damage prevention devices 1c are not adjacent to each other. Moreover, it arrange | positions so that the wide type | mold food damage prevention tools 1d may not adjoin each other (refer FIG. 12 (1) (2)).

  When the narrow-type food damage prevention device 1c and the wide-type food damage prevention device 1d shown in FIG. 10 are arranged as shown in FIG. 11 and FIG. 12, vegetative fish (particularly body height of 10 cm or more, body width of 5 cm or more) Can be prevented from entering the region on the top end surface 5a from the outer peripheral side of the root consolidation block 5 and from above, and germinate on the top end surface 5a of the root consolidation block 5 to grow. It is possible to suitably prevent the damage caused by herbivorous fish in the seaweed.

  As in the second embodiment, the attachment work of the anti-corrosion tool 1 to the root block 5 is performed by placing concrete in a mold for forming the root block 5, and then before hardening the concrete. The base 4 shown in FIG. 10 and the lowermost part of the central shaft portion 2 (portion from the surface of the base 4 to 2 cm above) are embedded in the concrete forming the top end surface 5a of the rooting block 5, that is, hammered. The concrete is hardened by embedding so that the height dimension from the surface of the provided concrete to the lowermost protrusion 3 of the anti-corrosion prevention device 1 is 3 cm.

  In addition, the dimension of the projection part 3 and the center axis | shaft part 2 demonstrated in the 3rd-8th embodiment, the space | interval dimension of the upper-and-lower stage protrusion parts 3, the space | interval dimension of the adjacent food damage prevention tool 1, an angle, etc. are each required Depending on the value, it can be appropriately adjusted within a range of ± 25%.

1: Food damage prevention tool,
1a: anti-corrosion tool for outside,
1b: Inside food damage prevention device,
1c: Narrow-type food damage prevention tool,
1d: Wide type food damage prevention tool,
2: Center axis part,
3: protrusions,
4: Base,
5: Rooting block,
5a: top face,
5b: inclined surface,
6: Seaweed
7: Vertical part,
C: longitudinal axis
S1: First stage,
S2: Second stage
S3: Third stage
S4: Fourth stage

Claims (7)

Consists of a central shaft portion and a plurality of protrusions,
The protrusions are arranged so that adjacent protrusions protrude radially from the central axis part with an angular interval of 45 ° to 120 ° around the longitudinal axis of the central axis part, and the length of the central axis part. It is comprised so that it may protrude in the angle range of 45 degrees-135 degrees with respect to an axis line, The seaweed prevention tool characterized by the above-mentioned.   The seaweed food damage prevention device according to claim 1, wherein a vertical portion extending in a direction of a range of vertical ± 20 ° is connected to and held by the protrusion.   The seaweed food damage prevention device according to claim 1, further comprising a bowl-shaped protrusion having a distal end portion bent with respect to the proximal end portion.   4. The seaweed food damage prevention device according to claim 3, wherein the protruding portion is provided in a bowl shape around the longitudinal axis of the central shaft portion.   A plurality of protrusions per stage are arranged in two or more steps in the vertical direction, and the protruding direction of the upper protruding part is different from the protruding direction of the lower protruding part. The seaweed food damage prevention device according to claim 1.   A concrete block with a seaweed damage prevention function, wherein a plurality of seaweed damage prevention tools according to any one of claims 1 to 5 are fixed on a top end surface or an upward inclined surface.   The anti-corrosion tool having the vertical portion is arranged at the outermost position on the top end surface, and the anti-corrosion tool not having the vertical portion is arranged at an inner position. A concrete block with a function of preventing damage to seaweed according to claim 6.

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