JPS6049733A - Lobster growing bank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Subject of the Invention] The present invention relates to a reef for growing Ise shrimp, and in particular, a reef that satisfies the growth conditions such as the ecology of Ise shrimp and is suitable for the Ise shrimp to protect themselves from external enemies and grow. Regarding shrimp breeding reefs.

[Background of the invention]

In recent years, various artificial reefs have been developed and used for the capture, protection, cultivation, multiplication, etc. of marine products.

Many of these artificial reefs are generally referred to as fish apartments, and are created by collecting grown seafood to create artificial fishing grounds, and are so-called fish collection reefs.

However, recently, the depletion of marine resources has become a problem, and 200 nautical miles has become a maritime domain, and the promotion of coastal fisheries has become an urgent need, and many fish and shellfish breeding reefs have been proposed. has been done. However, when it comes to Ise shrimp, we are investigating how young shrimp grow and what habits and ecology the adult shrimp have, and there are few reefs with structures that meet the conditions for growing them.

It is known that spiny shrimps are creatures that prefer iron ions, as they often inhabit places with iron rust, such as sunken ships, and rocky reefs with a high content of iron oxide. The spiny shrimp is a nocturnal creature, and is active over a wide area during the night, but during the day it has the habit of hiding in crevices in reefs, under stones, etc. In view of these habits, the present applicant has previously developed and applied for a reef for breeding spiny shrimp as shown in Figure 1 (Japanese Patent Application No. 87683/1983). In the figure, 1 is a concrete reef base with a trapezoidal front and side faces;
On top of this reef base, a plurality of concrete substrates 2 with gaps g suitable for the Ise shrimp to hide are fixed in a multi-stage manner by supports 3. This concrete substrate 2 has a structure in which a permeable layer of iron oxide such as ferrous sulfate or ferric sulfate is provided on one or both sides by a method described later.

With the structure described above, the gap g between the concrete substrates 2 and 2 contains many iron ions, and the acid from the iron sulfate leaves a slightly acidic content that neutralizes the alkali in the concrete. There is. As mentioned above, the spiny shrimp is a nocturnal creature and has a habit of preferring iron ions, so the gap g is a perfect habitat for them.

As a result of investigating the Ise shrimp breeding reef constructed as described above by sinking it into the seabed at a depth of 7 to 8 meters, some results were obtained, but problems were found in various respects. 1 Sea area has rough and violent waves and ocean currents, so the structure described above had a drawback in terms of strength. In particular, if they were installed in shallow rocky places, they would be vulnerable to strong waves caused by typhoons, etc. Furthermore, since the dimensions of the gap g were made the same for the outer circumferential portion and the center portion, there was also a drawback that it was difficult for the spiny shrimp to smoothly enter the gap g.

[Purpose of the invention]

The present invention has been made with the above-mentioned points in mind, and aims to provide a reef for breeding spiny lobsters that has a structure that can withstand rough and violent waves in shallow waters and has a gap shape that allows spiny lobsters to smoothly enter. purpose.

[Summary of the invention]

The key point of the present invention is that the alkali in the concrete is neutralized with an acid on one or both sides of a plate-shaped concrete block having a tapered inclined surface on the periphery, and oxidation of ferrous sulfate, ferric sulfate, etc. A permeable layer containing iron is provided, and a plurality of concrete blocks are assembled and fixed in a multi-tiered manner on the reef base with gaps of suitable size for the Ise shrimp to hide.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view of a reef for cultivating spiny locusts according to an embodiment of the present invention, FIG. 3 is a front view, and FIG. 4 is a side sectional view taken along line AA' in FIG. 2. In the figure, reference numeral 11 denotes a plate-like block made of concrete and having a rectangular planar shape.The lower surface 11a of this block 11 is made of one flat surface, and the upper surface has a tapered inclined surface portion 11b at the periphery and a flat portion at the center. It consists of 11C. Therefore, the peripheral end thickness tl of the block 11
and the thickness t2 of the central portion have a relationship of tl<t2. Moreover, the lower surface 11a of the block 11 is made of square columnar concrete.
A total of six support block lids manufactured by No. 1 to 1 are provided integrally with the block 11 in two rows of three at equal intervals. On the upper surface of the block 11 are the six supporting blocks 11. d
There are six rectangular recesses that are shaped to engage with each other. 12 is a concrete block body that serves as a reef base, and the size of the top surface of this reef base 12 is larger than that of the block 11.
A total of 12 recesses are provided, which are slightly larger in size than those that can be arranged side by side, and into which the six support block lids of the block 11 engage.

The block 11 is placed on the reef base 12.
Two blocks are placed in the recesses provided on the upper surface of the block 1 so that the support block lid provided on the lower surface 11a of the block 1 fits into the recess. Next, the block 11 is placed on top of the block 11, and the block 11 is placed in the recess provided on the top surface of the block 11.
Four support blocks 1] and d provided on the lower surface 11a of the support blocks 1 and d are stacked in sequence. Next, pass the bolt 13 from the bottom of the reef base 12 through the hole provided in the reef base 12, the stacked blocks 11 and the support block lid,
A nut 14 is tightened to integrally fix the reef base 12 and the four stacked blocks 11.

In addition, reference numeral 15 denotes lifting metal fittings for lifting and sinking the reef of the above structure using a crane or the like, and a total of four metal fittings are provided, one for each square of the reef base 2.

The dimension from the lower surface 12a of the reef base to the upper surface of the upper block 11 is approximately 1.5 to 1.5 mm, which is the normal vertical activity range of Ise shrimp.
It is best to set it to 2m. The gap g2 at the center of the block is an appropriate gap for the Ise shrimp to protect itself from predators and hide, and is approximately 7 to 20 cm depending on the size of the shrimp. The gap gl at the circumferential edge is set to a size that allows the spiny shrimp to easily enter without resistance.

With the structure described above, the upper surface of the block 11 is composed of a tapered inclined surface portion 11b at the periphery and a flat portion 11c at the center, and has a shape close to a streamlined shape that allows seawater to easily flow on the surface. Moreover, since the thickness t2 of the central part of the block 1 can be increased, and the quadrangular columnar support block lid is also formed integrally with the block 11, the weight of the block 11 can be considerably increased, making it stable. It has a structure with excellent properties. In addition, for the assembly of block 1 and block 11 and the assembly of block 11 and reef base 2, the support block lid is inserted into the recess and 1 is assembled, and the reef base 12 and the plurality of blocks 11 are assembled using six bolts. 13 and nuts 14, the structure is strong enough to withstand rough and violent waves in shallow seas.

Since the block 11 is made of concrete, when the reef is submerged in the sea, the alkali in the concrete erupts from the surface of the block 11.

This alkali is harmful to diatoms, algae, and seafood, and it is necessary to neutralize it. A method for neutralizing the alkali ejected from the surface of the block 11 will be described below.

First, pour mortar into the frame (not shown) and block 1.
1 is manufactured by pouring mortar into the concrete, and while it is still in an uncured state, a large number of crystal lumps 16 of ferrous sulfate or ferric sulfate are embedded in the surface of the concrete, as shown in FIG.
As the hardening of 1~ progresses, concrete loses moisture and hardens. on the other hand.

The crystals 16 are dissolved by the moisture in the concrete, forming a porous permeable layer 17 having many irregularities as shown in FIG. This permeable layer 17 of ferrous sulfate or ferric sulfate has numerous uneven surfaces on its surface, as shown in a partially enlarged view in FIG. , resulting in a structure that does not peel off easily. This ferrous sulfate or ferric sulfate permeation layer is a layer rich in iron oxide and has weak acidity, as the alkali in the concrete is neutralized by the acid from the iron sulfate.

After the block 11 has hardened, as shown in FIG. 8, a concrete penetrating liquid made of a surfactant mixed with fine powder of ferrous sulfate or ferric sulfate is applied to the lower surface 11a of the block 11. Due to the penetrating action of the surfactant in the agent, fine powder of ferrous sulfate or ferric sulfate also penetrates from the surface of the concrete into the concrete like roots, forming a permeable layer as shown in the enlarged view in Figure 9. . The smaller the particles of this ferrous sulfate or ferric sulfate fine powder, the better.

In addition, the above-mentioned container is not limited to concrete penetrating liquid mixed with fine powder of ferrous sulfate or ferric sulfate, but also fine powder of iron oxide such as gamma iron oxide consisting of particles of 1 micron or less. Alternatively, a container containing a concrete penetrant mainly composed of a surfactant and a small amount of sulfuric acid may be used. When this container is applied, the sulfuric acid and iron oxide powder permeate from the surface of the concrete into the interior like roots of a tree due to the penetrating action of the surfactant, forming a permeable layer 18 similar to that shown in Figs. 8 and 9. do.

The permeation layer 18 is formed by dissolving the ferrous sulfate or ferric sulfate, and the strong alkali (P
H13) and forms a slightly acidic layer.

As described above, a reef consisting of a block 11 and a reef base 12 is formed with a porous permeable layer 17 made of lumps of ferrous sulfate or ferric sulfate on the surface and a permeable layer 18 made of a container on the lower surface. When the block 11 is submerged, the alkali in the concrete will not erupt from the surface of the block 11, and iron ions, which are preferred by spiny shrimp, will be present in abundance.

In the above embodiment, the permeation layer 7 of the crystal lumps 6 of ferrous sulfate or ferric sulfate was formed on the surface of the block 1, and the permeation layer 8 of the container was formed on the lower surface. Depending on the shape of the mold, a porous permeation layer 17 made of crystalline lumps of ferrous sulfate or ferric sulfate may be formed on the lower surface, and a permeation layer 18 made of a container may be formed on the upper surface. Porous permeation layers 17 or permeation layers made of a container may be formed on both sides.

In addition, in the above embodiment, the block 1 is placed on the reef base 12.
1 is installed in multiple stages, but the arrangement is not limited to this, and it may be one or more. Further, the acid mixed in the container is not limited to sulfuric acid, but any acid that neutralizes the alkali in concrete may be used. Furthermore, the inclined surface on the taper is not limited to the area around the top surface, but may be formed around the bottom surface or around both the upper and lower side surfaces.

〔Effect of the invention〕

As explained above, the spiny shrimp breeding reef according to the present invention has good stability and strength because blocks having a plurality of tapered slopes around the periphery are assembled and fixed in multiple stages on the base. It is also strong enough to withstand waves in shallow seas. In addition, the alkali in the concrete does not spew out from the block surface, and there is plenty of iron oxide, which is preferred by Ise lobsters.The gaps between blocks are larger at the periphery and narrower at the center, so Ise lobsters can move smoothly. It has an extremely good effect of being able to penetrate into the world.

[Brief explanation of the drawing]

Fig. 1 is a side view of a reef for breeding spiny lobsters that the present applicant previously applied for, Fig. 2 is a plan view showing the reef for cultivating spiny lobsters according to the present invention, Fig. 3 is a front view, and Fig. 4 is a second The AA' side elevational views of FIGS. 5 to 9 are diagrams showing the manufacturing process of the block. In the figure, 11 is a block, 12 is a reef base, 13 is a bolt,
14 is a nut, and 15 is a hanging fitting. Applicant Tokyu Musashi Industries Co., Ltd. Agent Patent Attorney Takashi Kumagai Figure 1 Figure 20 15 14 110 Figure 3 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] A plate-shaped concrete block with a tapered slope around its periphery is provided with a permeable layer on at least one side in which the alkali in the concrete is neutralized by acid and iron oxide is present. A reef for cultivating spiny shrimp, characterized in that a plurality of pieces are assembled and fixed in a multi-stage manner on a reef base with a gap of size suitable for hiding them.