JP2009215819A - Artificial sunk stone body and fish farming block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial sunk stone body capable of preventing the occurrence of the scouring of a fish farm without damaging the growth environment of lives while making good use of the features of concrete such as large weight and strength. <P>SOLUTION: This artificial sunk stone body for preventing scouring of the fish farm is constituted by a block having a three-dimensional shape and constituted by connecting mortar or concrete linear bodies formed by mixing vegetable fibers mutually and partially and forming clearances among the linear bodies. This artificial sunk stone body has amount of mixed vegetable fibers of 20 Kg/m<SP>3</SP>or more and diameter of the linear body of 5-200 mm. The mortar or concrete is formed by using low pH cement containing MgO and P<SB>2</SB>O<SB>5</SB>as main components as a binder. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an artificial stone body and a fish nest block that are artificial stone bodies that suppress scouring caused by the flow of water on an underwater structure and that are compatible with the habitat of living organisms.

    When installing structures on sandy water bottoms, scouring is often caused by the water flow hitting the foundation, and as a countermeasure, this is called a filter unit with concrete blocks or crushed stones for preventing scouring. Things are used.

  For example, as shown in FIG. 1, the concrete block 2 for preventing scouring is placed on the side of the foundation 1 of the underwater structure where the flow strikes. Although this block 2 shows the effect which suppresses scouring of the foundation 1 as it is, it cannot be denied that this block 2 itself receives scouring. For example, as illustrated in FIG. 2, the sandy ground on the side where the flow of the block 2 hits is gradually scoured as (a) → (c), and eventually scoured to the bottom (c), It becomes inclined (d). As a result, the scouring prevention effect on the foundation 1 is also reduced, and maintenance is required.

For this reason, various proposals have been made to alleviate the scouring action by devising the shape of the scouring prevention block 2 and further using porous concrete or the like (for example, Patent Documents 1 to 3). Patent Document 3 describes a three-dimensional block in which linear bodies of mortar or concrete mixed with plant fibers are partially bound to each other and a gap is formed between the linear bodies. , There is no teaching or suggestion about using this block for scouring prevention.
JP-A-11-107243 Japanese Patent No. 2751036 JP 2002-306351 A JP 2003-265039 A

  As in Patent Documents 1 to 3, scouring can be mitigated by using concrete blocks with many voids or blocks made of porous concrete with small gaps, but there are also limitations. In both cases, the bottom of the block where the block is installed is not inhabited by organisms, and the part is usually inanimate.

  Therefore, the present invention solves such problems, obtains an artificial stone body that has a high anti-scouring effect and does not harm the habitat of living organisms, and further creates a fish nest that can create a good symbiotic environment of living organisms and plants. The challenge is to get a block.

According to the present invention, scour prevention comprising a solid block in which linear bodies of mortar or concrete mixed with plant fibers are partially bound to each other and a gap is formed between the linear bodies. An artificial stone body is provided. The blending amount of the plant fiber in the mortar or concrete is preferably 20 kg / m ³ or more, and the diameter of the linear body is 5 to 300 mm. The mortar or concrete is preferably a low-pH cement mainly composed of MgO and P ₂ O ₅ as a binder.

  This artificial stone body consists of a lower body part embedded in the bottom of the water and an upper body part exposed in water. The lower body part and the upper body part may be integrally connected or may be separable. In any case, aquatic plants such as algae, submerged plants and floating leaf plants can be grown on the upper body. In particular, it is possible to cultivate and proliferate aquatic plants by laying soil in the gaps between these artificial stone bodies, and aquatic plants on this soil material, and then placing them in water. Examples of algae include agaric, hibermata, mill, shajikumo, hondawara, kombu, kajime, arame, kurome, hirome, hijiki, funori, havanori, etc. For example, floating plants include eagles, water lilies, etc., and extracted plants include reeds, cattails, and mushrooms. Furthermore, according to the present invention, a solid block in which mortar or concrete linear bodies blended with plant fibers are partially bound to each other and a gap is formed between the linear bodies; Provided is a fish nest block comprising a cylindrical body having openings at both ends or at one end inserted so as to be fixed or detachable in a gap between the cylindrical bodies.

The present invention relates to a block made of a water-retaining mortar or concrete linear body mixed with plant fibers as an artificial stone body to be installed on the bottom of the water, wherein the linear bodies are partially bound to each other and the linear body It is characterized in that the basic material is a solid block in which a gap is formed between them. As the cement constituting the artificial stone body, a low pH cement mainly composed of MgO and P ₂ O ₅ can be used, thereby reducing the influence on the living environment of living organisms.

  When an appropriate amount of vegetable fiber is added to cement-based mortar or concrete, a hardened body with water retention function and strength can be obtained in the hardened state. The body can be deformed while maintaining a linear shape. In other words, by blending plant fibers, a hardened body structure in which water can be impregnated into the cement matrix can be obtained, and a viscous kneaded material that can be extruded into a linear body in a fresh state can be obtained. Although the linear body extruded from the mouth can be freely deformed, it can be held until the linear shape is cured, so if the linear body is bent and entangled before it has hardened, it will look like instant dry noodles. As can be seen, a joined structure in which the linear bodies are crimped and intertwined is obtained, and this structure has an arbitrary shape with an appropriate gap because the linear bodies are partially bonded and hardened. Can be a solid block.

  FIG. 3 shows an example of the shape of a three-dimensional artificial stone body according to the present invention, and FIG. 4 shows a cross section taken along the line XY in FIG. As shown in FIGS. 3 to 4, in the artificial stone body of the present invention, a linear body 3 made of a cement-based hardened body (mortar or concrete) blended with plant fibers is bent and entangled to form a three-dimensional block 4. The block 4 has a structure in which the hardened linear bodies 3 are partially bound and have a gap between the linear bodies. At first glance, it looks like instant dried noodles (instant noodles). It has a three-dimensional shape that expands the crimped and solidified noodles.

In order to prepare such a block 4 of hardened cement body, as shown in FIG. 5, for example, mortar or concrete 5 not yet solidified with plant fibers (hereinafter referred to as “green mortar with plant fibers” for short) ) Is extruded as a continuous linear body of raw mortar containing plant fibers from the nozzle 7 by a grouting pump 6, and is placed in the mold 8 while being bent and entangled. At that time, when an appropriate amount of plant fiber is blended and the water-cement ratio and unit water volume are adjusted, the linear body of raw mortar containing plant fiber extruded from the nozzle 7 does not break even if it is bent at a right angle of 180 ^°. , Turn freely with a twist. When plant fibers are not blended, it is difficult to provide such properties, and when extruded into a linear body as a kneaded material having shape retention, it will break immediately upon bending.

  In the example shown above, an example is shown in which a worker moves the nozzle back and forth and left and right to form a three-dimensional structure in which mesh-like objects are stacked when placing in a formwork. Of course, this can be performed by mechanization. The three-dimensional shape is not limited to this example, and may be any shape as long as the linear bodies are partially bound and a predetermined gap is formed between the linear bodies. . For example, it is possible to create three-dimensional blocks having various shapes such as a polygonal solid block whose side faces are trihedral, tetrahedron, pentahedron, hexahedron, and other polyhedrons, or a cylindrical shape whose side faces are cylinders or elliptic cylinders.

About the diameter of the linear body of the raw mortar extruded from a nozzle, a diameter is 5 to 300 mm, Preferably it is 5-200 mm, More preferably, the thing around 10-150 mm is easy to handle. The blending of raw mortar with plant fibers will be described later. The plant fibers used are preferably those having a length of 2 to 12 mm and a diameter of about 0.1 to 1.0 mm. The appropriate range varies depending on the type of fiber, but it should be 10 to 80 kg / m ^3, preferably 20 to 60 kg / m ³ , and the wet performance of the cured linear body as the amount of plant fiber increases. (Water retention performance) and deformation performance of the linear body of raw mortar are enhanced. However, if too large, increased where the aggregate surface covered with plant fibers, since it becomes possible to reduce the bonding strength between the aggregate, cement, 80 Kg / m ³ or less, preferably 60 Kg / m ³ less It is good. When kneading, it is preferable to first knead the plant fiber in the cement paste, and mix the plant fiber-containing cement paste with the aggregate. As plant fibers, cotton, hemp, coconut shells, cocoons, cocoons, and the like can be used.

  When using plant fiber, it is recommended to use it in a state where the dried body is well loosened. Depending on the nature of the plant fiber, the diameter and length of each fiber, as well as the surface condition and shape (such as needle or plate), are random. What is necessary is just to make it the dimension shape which can be disperse | distributed well in concrete. When cotton or hemp is used, a material having a length of about 2 to 12 mm and a diameter of about 0.2 to 0.7 mm may be added and dispersed little by little into the material being mixed. At that time, it is preferable to perform the kneading for 60 seconds or more before mixing water.

  It is also preferable to promote the dispersion of plant fibers using a dispersant for concrete. There are various types of dispersants that can be used, and examples thereof include a high-performance water reducing agent (trade name, Leobuild 8000ES, etc.). Moreover, thickeners, such as water-soluble polymer, can be used as needed.

As the cement to be used, ordinary cement can be used. However, when low pH cement is used, raw mortar containing plant fibers with low pH can be obtained, and an artificial stone body can be made in the present invention with low pH (low alkali). As the low pH cement, a low pH cement mainly composed of MgO and P ₂ O ₅ can be used. Examples of such a low pH cement include a soil hardener composition mainly composed of light-burned magnesia described in JP-A No. 2001-200252. A low pH cement corresponding to this is commercially available under the trade name Mag White. Furthermore, a part of the cement can be replaced with blast furnace slag fine powder, fly ash, silica fume and the like as necessary.

  As the aggregate component, normal fine aggregate and coarse aggregate can be used, but when coarse aggregate is used, it is necessary to use the one whose maximum dimension is smaller than the nozzle diameter. When using aggregate, the maximum dimension is preferably 5 mm or less. As fine aggregate, in addition to ordinary river sand, soil components such as volcanic ash soil, black soil, etc. can be used. Moreover, fine powders, such as limestone powder, can also be mix | blended. Furthermore, a lightweight fine aggregate can also be used.

The plant fiber 15 Kg / m ³ or more, preferably by blending 20 Kg / m ³ or more, the water-cement ratio and high equal to or than this in the case of the conventional porous concrete (e.g. 25% to 35% water cement with porous concrete When kneaded, a kneaded product with a slump value of up to 1.0 cm can be obtained. The cured product has a water permeability of 1.0 to 3.0 cm / sec and a unit water absorption of 10 to 40%. Water-retaining concrete (mortar) can be obtained. Therefore, the block of the present invention formed by extruding the kneaded material from a nozzle and bending-entangled to form a three-dimensional shape and curing it is obtained from a cured linear body having a water absorption rate of 10 to 40%. Become. For this reason, since a linear body itself shows water retention property, it is a very suitable material as a base material for living organisms.

Further, the block according to the present invention can be a cured product having a compressive strength of 250 to 330 kgf / cm ² and a bending strength of 40 to 50 kgf / cm ² . In other words, it is possible to obtain strength properties equivalent to those of ordinary concrete or mortar. As shown in FIG. 3, the hardened linear body 3 has a three-dimensional shape in which it is bent and entangled and partially bound, so that there are many gaps between the linear bodies 3. . When the volume of this gap is expressed as a porosity, this porosity can be freely controlled by adjusting the degree of bending entanglement of the linear body 3, for example, a block having a porosity of 20 to 80%, preferably a porosity of 30 It can be ˜60% block. This gap serves to suppress scouring. This state is shown in FIG.

  FIG. 6 shows a state in which the artificial stone body 9 according to the present invention is installed on the bottom 10 where there is a water flow. As shown in FIG. 6A, in the portion 11 where the water flow hits, the stone body 9 is When partially scoured, there are many gaps in this artificial stone body 9, so the gaps are also partially scoured, but the sand is naturally returned to this scoured part. , It is restored immediately as shown in FIG. That is, no deep scouring occurs as shown in FIG. In particular, since the artificial stone body 9 according to the present invention has a uniform gap on the side surface and a uniform gap as a whole that communicates with the inside, it acts on the water flow from any surface in the same manner. It is possible to prevent only one side from being scoured. Furthermore, it is possible to prevent scouring in a wider range by connecting these single units.

  The artificial sedimentation body 9 in the bottom of the water is filled with sandy material similar to that of the bottom of the water to form a living environment similar to that of the bottom of the water. 、 Can grow organisms. In particular, a plant fiber-containing block using low pH cement maintains the same environment as sand mud, so it is suitable for the micro-animal ecosystem and plant growth on the bottom of the water.

  The artificial stone body 9 according to the present invention having properties suitable for the living environment of such organisms can be actively used for increasing and culturing underwater plants. An example of this is shown in FIG.

  FIG. 7 shows an artificial stone body 9 according to the present invention consisting of a lower body part A embedded in the bottom of the water and an upper body part B exposed in water. Both the lower body part A and the upper body part B are composed of three-dimensional blocks in which linear bodies of mortar or concrete mixed with plant fibers are partially bound to each other and a gap is formed between the linear bodies. . The lower body part A and the upper body part B may be integrally joined, or may be separable vertically as shown on the right side of FIG.

  FIG. 8 shows a state in which the algae 13 are grown on the upper body portion B while the lower body portion A is buried in the bottom of the water. That is, the roots of aquatic plants such as algae extend in the gaps between the linear bodies in the upper body part B, and this upper body part B serves as the base for the aquatic plants. Moreover, it can also be set as the state by which the aquatic plant was grown on the linear body surface in the upper body part B. FIG. In this case, if the surface of the linear body has irregularities, the formation can be subsidized. The surface irregularities are preferably formed by a large number of grooves along the axial direction of the linear body. Examples of the substances that adhere to and grow on the surface of the linear body include diatoms such as diatomaceous earth and citrus diatoms, green algae such as Aosa, red algae, and susbinori. 7 to 8, the upper body portion B has a shape similar to a gable roof, and when this is placed on the lower body portion A, a space 12 through which a water flow passes is formed under the roof. For this reason, in addition to many gaps between the linear bodies constituting the block, the flow also enters the space 12, so that the living environment of the organism is improved. As described above, since the scouring does not occur in the lower body part A, the upper body part B as the settlement base is also stabilized at the bottom of the water, and the gap in the lower body part A is also placed in a state suitable for the growth of organisms. When the lower body part A and the upper body part B are separable, it is preferable to form a meshing part for connecting them. Instead of meshing, connection may be made by connecting members such as metal fittings, lobes, tape, and wire.

  FIG. 9 shows an example in which an algae is transplanted and created using an artificial stone body according to the present invention. First, artificial seedling is performed from natural algal bodies 14 (artificial seedling method). The obtained spores and gametophytes 15 are sprayed on an artificial stone body according to the present invention (in this example, the upper body part B) and are then landed. At that time, it is preferable to load sand or soil as a soil material in the gap between the artificial stone bodies. This is cured for a predetermined period, stacked and transported to the installation place, assembled with the lower body part A, and transplanted to the water bottom 16. As a result, the root portion grows and grows in the gap between the upper body portions B. Meanwhile, at the bottom of the water, aquatic organisms live in and around artificial stones. In this example, spores and gametophytes were used as the aquatic plant body. Furthermore, a soil substance was laid in the gap between the artificial stone bodies according to the present invention, and the aquatic plant body [for example, seeds, bulbs, nutrients (life A part of the body) (such as a rhizome or a slice of a branch), a young seedling or an adult seedling) is grown on land, and a method for growing an aquatic plant installed in water can be realized.

  FIG. 10 shows a transplanting / creating method using a natural seedling method. First, the artificial stone body 9 of the present invention is installed around the natural mother alga 17 and a naturally occurring juvenile body, for example, a spore or gametophyte 15 is placed on these. The artificial stone body 9 (which is actually its upper body B) that has been deposited is collected, cured as necessary, and transported to the transplantation site. And as an artificial stone body which assembled the lower body part A and the upper body part B, this is installed in the water bottom 16 and transplanted. As a result, the root portion grows and grows in the gap between the upper body portions B. Meanwhile, aquatic organisms inhabit in and around artificial stones at the bottom of the water.

  In this way, the lower body part A buried in the bottom of the water preferably has more than 30% of its volume with voids (similar voids on all sides), so that these voids can be sedimentary pebbles, sand or mud. Since it is clogged and acts to suppress scouring with small vortices made from voids against waves and currents, its position is stable and transplantation and propagation of aquatic plants can be performed stably.

  Moreover, since the artificial stone body according to the present invention is mixed with soil, sand, and plant fibers, these three members are exposed on the surface. In addition, since many linear bodies are partially joined with gaps, the surface area exposed to these three members is very large. For this reason, it is possible to select an implantation preferred by algal spores and gametophytes. In particular, the plant fiber is exposed on the surface, which demonstrates a flooring effect not found in stone or conventional concrete. Conventionally, for cultivation of seaweeds such as kombu, kajime, arame, wakame, honda walla, hijiki, mozuku, seaweed, etc., spores and gametes are attached to rope, cloth, paper, etc. Is used. In these, fibers play a major role, but in the artificial stone according to the present invention, the presence of plant fibers can also promote the implantation of these.

  In order to further expose the plant fiber to the surface, when discharging the linear body from the nozzle 7 as shown in FIG. 5, the nozzle 7 has an inner circumference instead of a circular or elliptical one. If a material having a large number of teeth, such as a star shape, is used, a lot of grooves are formed in the axial direction on the surface of the linear body, and the surface area becomes very large. ， One more range of options for the implantation of algae gametophytes.

  The linear body forming the artificial stone body according to the present invention has a characteristic that soil, sand, and plant fibers are easily cut by sand flow. For this reason, especially when it grows up with a year-round akamoku, etc., the part that adheres to and settles on the artificial stone body is scraped together with sand, etc., and the surface of the artificial stone body is renewed. As a result, the new surface can be easily used for the implantation of the next spore or gametophyte.

  7 to 10, the upper body part B of the artificial stone body according to the present invention is shown as an example of a gable roof type, but it does not necessarily have such a shape. For example, it may be a pyramid shape, a trapezoidal shape, a rectangular parallelepiped shape, a columnar shape, a cylindrical shape, an arch shape, or any other shape.

  Furthermore, according to the present invention, a fish nest block in which many kinds of organisms can coexist is provided by further improving the artificial stone body. FIG. 11 shows an example of a fish nest block according to the present invention. This fish nest block is obtained by attaching a cylinder with one end or both ends open, such as eel and catfish, to the artificial stone body of the present invention. FIG. 11 shows an example of the manufacturing process. In FIG. 11A, the linear body 1 is extruded from the nozzle 7 to form several layers in the same manner as in FIG. A cylindrical body 18 (having a length that is almost the full width of the block to be formed) is arranged, and several layers of the linear body 1 are further formed thereon as shown in (B), and the cylindrical body as shown in (C). One fish nest block unit is formed by molding the fish nest block 19 with the open end of 18 exposed from the block and curing it. By installing this on the bottom of the water, depending on the case, gravel, sand, earth, etc. may be loaded into the gaps between the linear bodies 1 of the block, and then installed on the bottom of the water, so that the collective fish nest of multiple creatures Can be configured.

  FIG. 12 shows an example in which the units of the fish nest block 19 are arranged side by side on the bottom of the water. It can be stacked not only in the horizontal direction but also in the vertical direction, and it can be made into a reef of the required size by being adjacent in both the horizontal and vertical directions. In that case, arrangement | positioning is considered so that the opening of the cylinder 18 may be exposed from a block main body so that the fish which likes cylindrical nest holes, such as a catfish and an eel, may enter the cylinder 18. FIG. As described above, plants can be grown and grown in the gaps between the linear bodies 1.

  According to the fish nest block of the present invention, since a small food chain is formed, it performs a function not found in previous fish nest books. Many fish nest blocks so far generally have relatively large indentations from the water surface to the bottom, and various creatures have not always been able to live together depending on their properties. Even if the size of the hole is changed by putting crushed stone in the hollow of a conventional fish nest block so that it can coexist as much as possible, it is normal that the gap changes due to the change of flow and the creature does not have the preferred size. is there. For this reason, fish such as eels, catfish, loach, mussels, hornets, ayu moss, and donko, amphibians such as salamanders and frogs, crustaceans such as crabs, crabs, crayfish, crayfish, and shrimp, as well as water crabs, etc. So far, there has been no fish nest block that can live well together with creatures that are fertile and negatively luminous and have contact properties depending on the species.

  On the other hand, in the fish nest block of the present invention, creatures that prefer tubes (things that have the property of entering holes), creatures that prefer mud, sand, and pebbles (those that have the ability to sink), creatures that prefer voids and spaces (hidden) Plants that have a rough surface (like algae) can live together. For example, the cylindrical body 18 becomes a resident of large fish such as eels and catfish, and the gaps in the linear body 1 (with pebbles, sand, and soil loaded as necessary) enter small spaces such as small fish and crustaceans. Will be living together. Small fish and crustaceans living in the latter living area (fishes such as Drosophila, Yoshinobori, and Chichibu, amphibians such as Salamander and frogs, crustaceans such as crabs and shrimps, aquatic insects, and shellfish) are large. It also serves as a food for fish and forms a food chain with algae that grow here. In order for the plant to settle, the surface of the linear body 1 should have irregularities as described above. In some cases, the upper surface of the fish nest block may be above the water surface, and the upper surface of the block on the water surface may be used for plant planting.

  In the case of an eel, the cylinder 18 has an inner diameter of about 5 cm and a length of about 50 to 60 cm. In the case of a catfish, the inner diameter is about 8 to 10 cm and the length is about 60 to 70 cm. Bamboo is particularly good. As shown in FIG. 11, the cylindrical body 18 can be integrated into the linear body 1 and solidified and fixed. However, before the linear body 1 is still solidified, the cylindrical body 18 is extracted and the cylindrical body 18 enters. A configuration may be adopted in which a hollow body is formed and solidified, and the cylindrical body 18 is detachably attached to the hardened block. Moreover, the hole which the cylinder 18 enters can also be provided in the hardened block.

When this block is installed at the bottom of the water, it is not necessary to fill the block with sand or the like. A small living inhabitant is created that does not change greatly even if there is a small flow of pebbles, and fish, amphibians, crustacean aquatic insects, shellfish, etc. that prefer this small space live in the cylinder 18. A coexistence zone with large fish that live is established, and a stable symbiotic environment is maintained by the original scouring prevention function of the stone body of the present invention. Moreover, the rough surface (surface with irregularities) of the linear body 1 receives sunlight and grows algae. The growth of algae gives the intensity of light to form an environment for growing various plants from green algae to diatoms, and the living organisms that feed on these grown plants accumulate and live. Holds. The mortar or concrete constituting the linear body 1 may be ordinary cement as its binder, but as described above, low pH cement mainly composed of MgO and P ₂ O ₅ is used, and soil (black soil) is moderately used. A fish nest block that is preferable for a living creature can be formed by blending the plant fiber with the plant fiber.

Examples of material blending of typical plant fiber raw mortar for producing artificial stone bodies and fish nest blocks according to the present invention include:
Low pH cement (trade name: Mug White): 500Kg / m ³ ± 50Kg / m ³
Black soil: 500Kg / m ³ ± 50Kg / m ³
Sand: 400Kg / m ³ ± 40Kg / m ^{3
Water: 420Kg / m 3 ± 40Kg /} m 3
Plant fibers (in the case of ^{cotton): 20Kg / m 3 ± 5Kg} / m 3
As an admixture,
Admixture for soil cement (trade name Leosoyl 100A): 5 kg / m ³ ± 1 kg / m ³
Admixture for soil cement (Brand name Leosoil 100B): 3Kg / m ³ ± 1Kg / m ³
Can be illustrated.

As a result, for example, a cured product having an air-dry specific gravity of 1.5 ± 0.2 and a wet specific gravity of 2.1 ± 0.2 can be obtained. This hardened body (a linear body for creating a three-dimensional block) has, for example, a compressive strength of 300 kgf / cm ² ± 50 kg / m ³ , a bending strength of 45 kgf / cm ² ± 10 kg / m ³ , and a unit water absorption of 30 It becomes a cured product showing a water retention of about% ± 10%.

  As described above, the artificial stone body of the present invention has an action of suppressing scouring that occurs when a water flow acts on an underwater structure. For this reason, while contributing to the stability of an underwater structure, since the artificial stone body of this invention is compatible with the habitat of a living organism, it does not harm the natural environment. According to the artificial stone body of the present invention, algae can be transplanted and created efficiently, which can also be used for the creation of moats. Furthermore, according to the fish nest block using the artificial stone body of the present invention, it is possible to form a collective symbiosis with a good cocoon chain that has never existed so far in that various creatures can live together.

It is a schematic sectional drawing which shows the state which installed the scouring prevention block in the foundation part of the underwater structure. It is the figure which showed the occurrence situation of scouring in the bottom of the water. It is a schematic plan view which shows an example of the block which comprises the artificial stone body according to this invention. It is XY arrow sectional drawing of FIG. It is the schematic which shows the example which loads the linear body of the raw mortar containing a vegetable fiber according to this invention in a formwork. It is the figure which showed the situation where scouring does not occur in the artificial stone body according to the present invention. It is a perspective view which shows the example of the lower-body part and upper-body part of the artificial stone body of this invention. It is a schematic sectional drawing which shows the state in which algae was planted in the artificial stone body of this invention. It is the figure which showed the example of a process which performs seedling, transplantation, and proliferation of algae using the artificial stone body of this invention. It is the figure which showed the example of another process of performing seedling, transplantation, and proliferation of algae using the artificial stone body of this invention. It is a figure which shows the process of manufacturing the fish nest block according to this invention. It is a figure which shows the state which connected the unit of the fish nest block according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underwater structure 2 Scouring prevention block 3 Linear body which consists of cement-type hardened | cured material containing a plant fiber 4 Solid block 5 Raw mortar containing plant fiber 6 Grout pump 7 Nozzle 8 Formwork 9 Artificial stone
10, 16 bottom
12 Space through which water flows
13, Aquatic plants (algae)
14 Algae
15 Spores and gametophytes
17 Mother algae
18 cylinder
19 Fish nest block

Claims (10)

  An artificial scouring body for preventing scouring consisting of a three-dimensional block in which linear bodies of mortar or concrete blended with plant fibers are partially bound to each other and a gap is formed between the linear bodies. 2. The artificial scouring body for preventing scouring according to claim 1, wherein the blending amount of the plant fiber is 20 kg / m ³ or more and the diameter of the linear body is 5 to 300 mm. The artificial scouring body for preventing scouring according to claim 1 or 2, wherein the mortar or concrete is composed of a low pH cement mainly composed of MgO and P ₂ O ₅ .   A lower body part embedded in a water bottom, comprising a solid block in which linear bodies of mortar or concrete mixed with plant fibers are partially bound to each other and a gap is formed between the linear bodies; An artificial stone body consisting of an upper body exposed in the water.   The artificial stone body according to claim 4, wherein the lower body part and the upper body part are integrally connected.   The artificial stone body according to claim 4, wherein the lower body part and the upper body part are separable.   The artificial stone body according to claim 4, wherein aquatic plants are grown on the upper body part.   The artificial stone body according to any one of claims 1 to 5, wherein a number of grooves along the axial direction are formed on a surface of the linear body.   A method for cultivating aquatic plants, wherein a soil substance is laid in the gap between the artificial stone bodies according to claim 1 or 4 and an aquatic plant is grown on the soil substance on land, and then installed in water.   A solid block in which linear bodies of mortar or concrete blended with plant fibers are partially bound together and a gap is formed between the linear bodies, and fixed to the gap between the linear bodies or A fish nest block composed of a cylindrical body with both ends or one end opening inserted in a removable manner.

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