JP4246193B2 - Seaweed growth block and method for producing seaweed growth block - Google Patents

Description

  The present invention relates to a seaweed growth block in which the seaweed is submerged for the purpose of propagation of seaweed and the seaweed is deposited on the surface, and a method for producing the seaweed growth block. The present invention relates to a seaweed growth block that prevents firewood burning that prevents seaweed from landing, and a method for producing the seaweed growth block.

In recent years, seaweeds that inhabit the sea and land on the rocks of the seabed have been devoured by marine organisms such as sea urchins that prey on seaweeds, and then the surface of the rocks are covered with calcareous by innocent coral and seaweeds are Occurrence of firewood burning that makes it impossible to land is a problem.
In particular, taking the Sanriku coast of Iwate Prefecture as an example, this burning is often caused by seaweed being preyed on by a large number of sea urchins (mainly sea urchins). The inventors of the present application studied the ecology of sea urchins, and since sea urchins have sea urchin predators on the bottom, they do not prey on large seaweeds that have grown, but they land on rocks in the early stages of growth. It is easy to supplement seaweeds at an unacceptable stage. However, sea urchins are expensive and representative fish and shellfish, the amount of landing is large, and it is desired that sea urchins and seaweeds coexist with little extermination of sea urchins.

  Conventionally, as a seaweed growth block that suppresses sea urchin predation while being submerged on the seabed for the purpose of propagation of seaweeds, the seaweeds are deposited on the surface, for example, Patent Document 1 (Japanese Patent Laid-Open No. 5-219866) ) Is known.

As shown in FIG. 8, the seaweed growth block Ba includes a base block 1 formed in a substantially trapezoidal shape and a seaweed landing block 3 having a landing portion 2 on the upper surface. The seaweed landing block 3 is integrally fixed to the base block 1 via bolts 4.
The seaweed landing block 3 is formed in a substantially square plate shape, and a recess 6 formed in a size covering the upper side of the base block 1 is provided on the back side thereof. The recess 6 is provided with a back-side concave ceiling surface 7 that is in contact with the upper end surface of the base block 1 and located on the front side of the outer peripheral edge of the back surface of the seaweed landing block 3.

  Since the seaweed growth block Ba is provided with a recess 6 on the back surface of the seaweed implantation block 3, the seaweed growth block Ba is submerged in the sea with the base block 1 side facing the seabed. When installed, air remains in the recess 6 and an air layer is formed in the recess 6. As a result, when the sea urchin scooping up the outer surface of the base block 1 touches the air layer in the recess 6 of the seaweed landing block 3, the direction changes without returning. For this reason, sea urchins are prevented from entering the landing portion 2 of the seaweed landing block 3 on which seaweed has been landed, and seaweed damage caused by sea urchins is suppressed.

Japanese Patent Laid-Open No. 5-219846

  By the way, in such a seaweed growth block Ba, there is a problem that the structure of the base block and the landing block 3 is complicated, and the manufacturing is complicated and the cost is increased. Also, during installation, it is necessary to make the foundation block 1 side to face down so that the air in the recess 6 does not escape. There was a problem of becoming. Furthermore, since the invasion of the sea urchin that drifts in the sea and reaches the landing portion 2 of the seaweed landing block 3 can hardly be suppressed, there is a problem that the suppression efficiency is inferior.

  The present invention has been made in view of the above problems, and has simplified the structure, facilitated manufacturing, reduced costs, facilitated installation work, and further improved the efficiency of suppressing sea urchin intrusion. It is an object of the present invention to provide a seaweed growth block and a method for producing the seaweed growth block.

The inventors of the present invention have studied sea urchins in making the present invention, and found that sea urchins do not like those that are shaking in the sea.
Then, the seaweed growth block of the present invention for achieving such an object has a seaweed growth block provided with a block body having a landing portion on which the seaweed is landed on the upper surface and having a larger specific gravity than seawater. In the block for use, a floating body that exposes the landing portion and surrounds the space on the landing portion is provided.

Since this seaweed growth block is simply provided with a floating body in the block main body, the structure is simple and the manufacture becomes easy, and the cost can be reduced.
In addition, the seaweed growing block is placed under the sea floor. At this time, the block body is submerged on the seabed so that the upper surface of the block body faces the seaside. At this time, since the seaweed growing block does not use air, it can be in any posture when submerged in the seabed, making it easier to install the seaweed growing block. be able to.

In the seaweed growth block in the sea, the floating body surrounds the landing part. And this floating body comes to oscillate by the tidal current of the sea.
After a while in this state, for example, spores of seaweed floating in the sea land on the landing part, and thereafter seedlings of seaweed attached to the landing part grow.

  Then, when there is a sea urchin around the seaweed growing block and ascends the side of the seaweed growing block to reach the landing part, the sea urchin comes into contact with the floating body. Since sea urchins do not like anything that swings in the sea, sea urchins that come into contact with floating bodies dislike the floating bodies that have come into contact and leave the seaweed growth block. As a result, the seaweed at the stage immediately after landing on the rock in the early stage of growth is less likely to be supplemented by the seaweed in the early stage of growth because the sea urchin is kept away by the floating body. In addition, for example, even if there is a sea urchin drifting in the sea due to the tide, the floating body surrounds the upper part of the landing part, so the floating sea urchin will be caught by this floating body to some extent. , Can block them. Therefore, it is possible to improve the suppression efficiency of sea urchins entering the floor. After that, the seaweed grows and protrudes from the floating body, but since the sea urchin's prey mouth is attached below, the large seaweed on which the sea urchin grew hardly preyed. Can be prevented.

Moreover, the said floating body is formed in the cylinder shape with the sheet | seat whose specific gravity is smaller than seawater as needed.
As a result, the floating body naturally comes up from the block body. Therefore, the structure is simplified and the manufacturing cost can be reduced.
Furthermore, if necessary, the block body is formed in the bag body, and the floating body is constituted by a cylindrical portion on the opening side of the bag body.
Thereby, since a floating body can be formed easily, the block for seaweed growth can be manufactured, and manufacturing cost can be reduced.

In the seaweed growth block proposed in the development process of the present invention, the floating body is made detachable from the block body .
As a result, when the floating body breaks or is damaged or detached, the existing floating body is removed and a new floating body is attached. Thereby, even if a floating body breaks, since another floating body can be newly attached, the maintenance repair of the block for seaweed growth can be made easy.

Furthermore, if necessary, a fastening part for fastening a rope to which seaweed seedlings are attached is formed on the upper surface of the block body.
When a rope with seaweed seedlings attached to the anchoring part is fastened and submerged on the seabed, the seedlings of seaweed seedlings on this rope land on the landing part and grow. Thereby, compared with the case where spores or the like of seaweeds are naturally deposited on the implantation part, desired seaweeds can be immediately implanted and grown.

And the manufacturing method of the block for seaweed growth of the present invention for achieving such an object includes a block main body having a landing portion on which the seaweed is deposited on the upper surface and having a larger specific gravity than seawater. In the method for producing a seaweed growth block for producing a seaweed growth block configured by providing a floating body that exposes the floor portion and surrounds the space on the floor portion, the specific gravity is lighter than seawater Using a bag body that is formed by a sheet and the cylindrical part on the opening side is the above floating body, a large number of stones are placed inside the bag body so as not to reach the cylindrical part on the opening side of the bag body, Fill the inside of the bag body containing the stones with mortar so as not to reach the cylindrical part on the opening side of the bag body, and cure the mortar for a predetermined time to bind the numerous stones together and block The main body is formed.
As a result, the entire block body can be formed without depending on the mold and the floating body can be easily formed by simply putting stones and mortar into the bag, and the manufacturing cost of the seaweed growing block can be reduced.

Since the seaweed growth block of the present invention is simply provided with a floating body in the block main body, the structure is simple, the manufacture becomes easy, and the cost can be reduced.
Moreover, the seaweed growth block of the present invention may be in any posture when sinking to the seabed, and can facilitate installation work. In addition, after installation, in the seaweed growth block in the sea, the floating body surrounds the landing part and oscillates due to the sea tide, etc., and the sea urchin in contact with the floating body Since it dislikes the body and moves away from the seaweed growth block, the sea urchin is kept away by the floating body, and in particular, it is difficult to supplement the seaweeds at the early stage of growth of the seaweeds that have landed on the landing section. In addition, for example, even if there is a sea urchin drifting in the sea due to the tide, the floating body surrounds the upper part of the landing part, so the floating sea urchin will be caught by this floating body to some extent. , Can block them. Therefore, the suppression efficiency of sea urchin invasion was greatly improved. Thereby, the seaweed at the early stage of growth becomes less susceptible to sea urchin damage, and it is possible to prevent firewood burning.

  Furthermore, according to the method for producing a seaweed growth block of the present invention, the entire block main body can be molded regardless of the mold by simply putting stones and mortar into the bag, and the floating body can be easily formed. Since it can be molded, the manufacturing cost of the seaweed growth block can be reduced.

  Hereinafter, based on an accompanying drawing, the block for seaweed growth concerning an embodiment of the invention is explained in detail.

As shown in FIGS. 1 and 3, this seaweed growth block B1 includes a block body 10 having a landing portion 11 on which an algae is landed on the upper surface 14 and having a larger specific gravity than seawater. Yes.
The block body 10 is formed in a substantially cylindrical shape by a mixture of stone 12 and mortar 13. A part of the stone 12 is exposed from the mortar 13 on the upper surface 14 of the block body 10. In the embodiment, the block body 10 is formed with a diameter of 1 m to 1.1 m and a height of 1 m.

The landing portion 11 is constituted by an upper surface 14 of the block body 10 that is rough.
Further, as shown in FIG. 2, the upper surface 14 of the block main body 10 is formed with a fastening portion 15 for fastening a rope 19 to which seaweed seedlings are attached. The fastening portions 15 are provided at four locations, and are each separated by at least 20 cm. The fastening portion 15 includes a weld nut 17 embedded in the block body 10 and a bolt 18 screwed into the weld nut 17. The rope 19 is preliminarily attached with seedlings of seaweeds, and is formed to have a diameter of 3 mm and a length of 10 cm, for example. One end of the rope 19 is clamped between the female screw of the weld nut 17 and the male screw of the bolt 18 when the bolt 18 is screwed into the weld nut 17.

The block body 10 is put in a bag body 25. The bag body 25 is formed of a sheet having a specific gravity smaller than seawater. The cylindrical portion on the opening side of the bag body 25 is configured as a floating body 20. The floating body 20 exposes the landing portion 11 and surrounds the space on the landing portion 11. The height of the floating body 20 is, for example, 10 cm to 20 cm.
In the embodiment, the bag body 25 is formed of a white flexible container bag.

  Furthermore, a suspension bar 16 for lifting or hanging the seaweed growth block B1 is provided at the center of the block body 10. The hanger 16 is formed in an arch shape by bending a linear steel material made of stainless steel, and both ends of the steel material are embedded in the block main body 10 and provided in the block main body 10.

When manufacturing this seaweed growth block B1, it is as follows.
If it demonstrates using the process drawing shown in FIG. 4, first, as shown to Fig.4 (a), the bag body 25 will be prepared. Next, as shown in FIG. 4B, a large number of stones 12 are poured into the bag body 25 so as not to reach the cylindrical portion on the opening side of the bag body 25. Next, as shown in FIG. 4 (c), the inside of the bag body 25 in which the stone 12 is placed is filled with the mortar 13 so as not to reach the cylindrical portion on the opening side of the bag body 25 and the hanger bar. Both ends of the steel material to be 16 are inserted into the mortar 13 and the mortar 13 is cured for a predetermined time. Thereafter, the upper surface 14 of the block body 10 is roughly covered to form the flooring portion 11, the weld nut 17 of the fastening portion 15 is provided in the block body 10, and the male screw of the bolt 18 of the fastening portion 15 is provided. One end of the rope 19 is wound, and in this state, the male screw of the bolt 18 is screwed into the female screw of the weld nut 17, and the rope 19 is fastened to the fastening portion 15 (FIG. 4 (d)).
Thereby, simply putting the stone 12 and the mortar 13 can form the whole block main body 10 irrespective of a type | mold, and can also form a floating body easily, Therefore The manufacturing cost of the block B1 for seaweed growth can be reduced.

When installing this seaweed growth block B1 on the seabed, for example, a crane (not shown) or the like is used, the hook of the crane is hooked on the suspension bar 16, and the seaweed growth block B1 is suspended. Then it sinks to the sea floor.
At this time, the block body 10 sinks to the seabed so that the upper surface 14 of the block body 10 faces the seaside.
In this case, since the hanging muscle 16 is provided, the installation of the seaweed growth block B1 is facilitated. In addition, since the seaweed growth block B1 does not use air as compared with the conventional one, it can be in any posture when being submerged in the seabed, and can be easily installed.
In the sea, since the floating body 20 has a specific gravity smaller than that of seawater, the floating body 20 rises from the block body 10 and surrounds the landing portion 11. And this floating body 20 comes to rock | fluctuate by the tidal current etc. of the sea.

After a while in this state, as shown in FIG. 3, seaweed seedlings of the rope 19 fixed to the fixing portion 15 and spores of seaweed floating in the sea land on the landing portion 11. Thereafter, seedlings and the like of seaweed attached to the landing portion 11 grow.
At this time, the anchoring portion 15 is provided, and seaweed seedlings attached to the rope 19 anchored to the anchoring portion 15 can be landed on the anchoring portion 11, so that the seaweed naturally Compared with the case where spores and the like are deposited on the implantation section 11, desired seaweeds can be immediately implanted and grown.

  Then, when there is a sea urchin around the seaweed growing block B1 and ascends the side surface of the seaweed growing block B1 to reach the landing portion 11, the sea urchin comes into contact with the floating body 20. Since the sea urchin does not like anything that swings in the sea, the sea urchin in contact with the floating body 20 dislikes the floating body 20 in contact and leaves the block B1 for seaweed growth. As a result, sea urchins that have just landed on the rocks in the early stages of growth have their sea urchins kept away by the floating body 20, so that the seaweeds in the early stages of growth can hardly be supplemented.

In addition, for example, even if there is a sea urchin drifting in the sea due to a tide, the floating body 20 has a specific gravity smaller than seawater and rises from the block body, and the floating sea urchin is caught by the floating body 20 to some extent. So you can block them.
After that, the seaweed grows and protrudes from the floating body 20, but since the sea urchin's prey mouth is attached to the sea urchin, the large seaweed on which the sea urchin grows hardly prey. Burning can be prevented.
In the unlikely event that the seaweed growth block B1 is burnt, the hook of the crane is hooked on the hoisting bar 16, lifted, the instable coral is peeled off, and then submerged again.

Next, the seaweed growth block proposed in the development process of the present invention will be shown for reference.
As shown in FIGS. 5 and 6, sea algae growing block B2 This is different from those described above, the block body 10 is formed in a rectangular parallelepiped shape. The floating body 20 is formed in a cylindrical shape by a sheet having a specific gravity smaller than that of seawater, and is formed so as to be detachable from the block body 10 by a locking mechanism 30. The locking mechanism 30 includes a plurality of anchor bolts 31 from which the male screw portions protrude from the block body 10, and an insertion plate 32 through which the anchor bolts 31 are inserted, and a holding plate 33 that sandwiches the floating body 20 together with the block body 10. And an anchor nut 34 to be screwed into the anchor bolt 31.

  When manufacturing this seaweed growth block B2, using the process diagram shown in FIG. 7, the block body 10 is formed by molding with a stone 12 and a mortar 13 in advance. The anchor bolt 31 is attached to 10 (FIG. 7A). Next, the upper surface 14 of the block main body 10 is roughed to form the landing portion 11 (FIG. 7B), and the suspension bar 16 and the weld nut 17 of the fixing portion 15 are formed above the block main body 10. Is provided (FIG. 7C).

Next, the floating body 20 is placed on the block body 10, and the anchor bolt 31 is pierced into the lower end edge of the floating body 20 to expose the tip of the anchor bolt 31 (FIG. 7E). The insertion hole 32 is inserted into the anchor bolt 31, the anchor nut 34 is screwed into the anchor bolt 31, the floating body 20 is held by the holding plate 33 and the block main body 10, and the weld nut 15 is welded in the same manner as described above. A bolt 18 is screwed into 17 to fasten the rope 19 (FIG. 7 (f)).
When this seaweed growth block B2 is installed on the seabed, it is the same as described above.

And in this block B2 for seaweed growth, seaweed grows like the above-mentioned thing.
Thereafter, when the floating body 20 is broken or detached due to tearing or the like, the hook of the crane is hooked on the lifting rod 16 to lift the seaweed growth block B2, the anchor nut 34 is screwed back, and the holding plate 33, the existing floating body 20 is removed, a new floating body 20 is attached, and the new floating body 20 is held by the holding plate 33 and the block body 10 again in the same manner as described above. Thereby, since the floating body 20 can be newly attached even if the floating body 20 is damaged, maintenance and repair of the block B2 for seaweed growth can be facilitated.

  In the embodiment of the present invention, the block main body 10 is formed of stone and mortar, but is not limited to this, and rock or the like is used instead of stone, or concrete or resin is used instead of mortar. The design may be changed as appropriate.

It is a perspective view which shows the block for seaweed growth which concerns on embodiment of this invention. It is sectional drawing which shows the fixation part of the block for seaweed growth which concerns on embodiment of this invention. It is a perspective view showing the block for seaweed growth concerning an embodiment of the invention in the state where seaweed landed. It is a figure which shows the manufacturing method of the block for seaweed growth which concerns on embodiment of this invention. It is a perspective view which shows the block for seaweed growth proposed in the development process of this invention . It is a disassembled perspective view which shows the block for seaweed growth proposed in the development process of this invention . It is a figure which shows the manufacturing method of the block for seaweed growth proposed in the development process of this invention . It is a figure which shows an example of the block for the conventional seaweed growth.

Explanation of symbols

B1, B2 Seaweed growth block 10 Block body 11 Landing part 12 Stone 13 Mortar 14 Upper surface 15 Fastening part 16 Suspension 17 Weld nut 18 Bolt 19 Rope 20 Floating body 25 Bag body 30 Locking mechanism 31 Anchor bolt 32 Insertion hole 33 Holding plate 34 Anchor nut

Claims (3)

In the seaweed growth block having a block body having a landing portion on which the seaweed is landed on the upper surface and having a specific gravity greater than seawater,
Providing a floating body that exposes the landing portion and surrounds the space on the landing portion ;
The floating body is formed into a cylindrical shape with a sheet having a specific gravity smaller than seawater,
A block for growing seaweed, wherein the block body is formed in a bag body, and the floating body is constituted by a cylindrical portion on the opening side of the bag body . The seaweed growth block according to claim 1, wherein a fastening portion for fastening a rope to which a seedling of seaweed is attached is formed on the upper surface of the block body . Provided with a block body having a landing portion on the upper surface where seaweed is deposited and having a specific gravity greater than seawater, and a floating body is provided to expose the landing portion and surround the space on the landing portion In the method for producing a seaweed growth block for producing a prepared seaweed growth block,
  Using a bag body that is formed of a sheet having a specific gravity lighter than seawater and whose opening-side cylindrical portion is the floating body, a large number of the inside of the bag body does not reach the cylindrical portion on the opening side of the bag body. The mortar is filled so that it does not reach the cylindrical part on the opening side of the bag body, and the mortar is cured for a predetermined time, A method for producing a block for growing seaweed, characterized in that a block main body is formed by binding the seaweed.

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