JPH07216847A - Fish nest block and waterway structure using this - Google Patents

Abstract

PURPOSE:To construct a fish nest easy for fishes to live in by artificially forming various flow states in rivers in the natural world. CONSTITUTION:A body block 2 with plate parts 7, 9 protrusively provided in the opposed state at a base part 6 is used, and block pieces 5 of porous plate shape made of porous concrete are fixed in required layout into a recession 3 between the plate parts 7, 9 of the body block 2. This layout state includes an inclined state 17a inclined in relation to the flow direction of water in the recession 3, a parallel state 17b along the flow direction, an orthogonal state 17c orthogonal to the flow direction, and an inner surface contact state 17d of the plane coming in contact with the inner surface of the recession 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish nest block in consideration of the ecosystem of water bodies and a water channel structure using the fish nest block.

[0002]

2. Description of the Related Art As a conventional fish nest block, there has been proposed a concrete block provided with a concave portion or a concrete block having a concave stone filled therein. However, this kind of fish nest block has
There were the following problems. Although a fish nest block that only has recesses can provide a shelter for fish, it lacked consideration for raising aquatic animals, so it cannot provide an environment that actively encourages fish to inhabit. There wasn't.

In addition, the one in which the recessed part is filled with crushed stones deposits mud and organic matter in the space formed between the crushed stones and serves as a breeding source of microorganisms and algae. It was hoped that fish would gather to promote the habitation of such animals. Such a fish nest
Certainly, it can be said that it is a good habitat for fish compared to a mere recess. However, just filling the recess with crushed stones does not change the flow of water in that part, and places where the flow is fast or gentle,
In addition, various flow conditions such as those in natural rivers such as places where water flows back and stagnant cannot be formed at all. In addition, since the space between the stones is small, only small fish can live, the types of fish that can live are limited, and the effectiveness as a fish nest is poor.

A first object of the present invention is to provide a fish nest block which can solve such problems.

Moreover, the conventional artificial waterway (small river) is U
It was constructed by laying a ditch or was constructed by lining the bottom and side surfaces of the waterway body with three-sided cast-in-place concrete in a plane.However, these small rivers were designed exclusively for flood control and water use. However, due to lack of consideration on the habitation of aquatic animals and breeding of aquatic plants, there was a problem in environmental protection of the water area.

In view of the above problems, a second object of the present invention is to provide a water channel structure which can not only control flood and water, but also positively contribute to environmental protection of the water area. .

[0007]

To solve the above problems, the present invention employs the following means. That is, one aspect of the fish nest block according to the present invention is, in the recess of the concrete main body block formed by connecting the base end portions of the opposing plate portions to each other to form a recess, It is characterized in that porous block pieces having voids for growth are arranged as required.

It is preferable that the block piece is partially embedded in the inner surface of the recess or is fixed to the inner surface of the recess by bolt fixing means. Further, the block piece can be formed as a solid body or a hollow body made of porous concrete. When the block piece is formed as a porous flat plate, its arrangement state is such that the flat plate is inclined with respect to the flow direction of water in the recess of the main body block,
At least one of a parallel state along the flow direction of water in the recess, an orthogonal state orthogonal to the flow direction of water in the recess, and an inner surface abutting state in which the flat surface abuts the inner surface of the recess. Is good.

Another aspect of the fish nest block according to the present invention is that the concave portion of the concrete main body block is formed by connecting the base end portions of the facing plate portions to each other to form a concave portion between the plate portions. In addition, at least one of a block piece having a recess for downward opening, a block piece having an opening penetrating in the lateral direction, and a block piece having a cavity opened laterally is arranged as required. It is a thing.

It is preferable that a part of the block piece is embedded in the inner surface portion of the recess or is fixed to the inner surface portion of the recess by bolt fixing means. The block piece can be configured to have a flat plate shape. These block pieces are preferably constructed of a porous material having voids for biological growth.

Arrangement of the flat plate pieces in the fish nest block of the latter aspect (the inclined state, parallel state, orthogonal state, inner surface abutting state) in the fish nest block of the former aspect.
Can be combined.

In each of the former and latter fish nest blocks, it is preferable to provide a raised portion and / or a depressed portion on the bottom surface of the recess of the main body block. Further, it is preferable that the inner surface of the recess is formed to be uneven. Further, it is preferable that the front end portions or the side end portions of the opposing plate portions of the main body block are connected by a reinforcing member. Further, it is preferable that an opening is provided in the plate portion and / or a connecting portion between the plate portions, and a plate body made of porous concrete is fitted into the opening portion.

Further, in the waterway structure according to the present invention, the fish nest block is arranged on the bank of the waterway so that the recess of the main body block is opened inwardly of the waterway and is connected to the bottom of the recess. , A floor block is installed on the floor of the waterway. The floor block has at least one of a block piece having a recess for downward release, a block piece having an opening penetrating in the lateral direction, and a block piece having a cavity opening in the lateral direction, the upper surface portion of the substrate. It is characterized in that it is arranged as required. It is preferable that a part of the block piece forming the floor protection block is embedded in the inner surface of the recess or is fixed to the upper surface of the substrate by bolt fixing means. Further, it is preferable to dispose gravel as required on the upper surface of the substrate and around the block piece.

[0014]

When the fish nest block according to the present invention is constructed by using a porous block piece, the block piece can change the flow condition in the fish nest in a desired manner in addition to the block. Mud or organic matter can be allowed to enter the voids inside the piece, and mud or organic matter can be deposited in the recess (bottom surface portion) of the main body block. As a result, microorganisms (aerobic or anaerobic microorganisms) and algae will propagate in the surface of the block piece, in the voids inside the block piece, and in the soil around the block piece. Not only will water quality be purified, but various aquatic animals such as protozoa and insects will breed using this as a nutrient source. Furthermore, in search of these, fish and shellfish that are suitable for the flow state will gather and inhabit.

In particular, the block piece is formed as a plate body, which is arranged in the recess of the main body block by a required combination of the inclined state, the parallel state, the orthogonal state, and the inner surface abutting state, so that the natural state is obtained. It will be possible to easily construct a fish nest having various flow conditions (rapid flow, gentle flow, reflux, stagnation, etc.) similar to the flow of a river.

Further, when the fish nest block according to the present invention is constructed by using a block piece having a recess for downward opening, an opening penetrating in the lateral direction, and a cavity opening laterally,
A space close to the space on the back side of the floating stone (stone on the riverbed) in a natural river can be formed by the recess, opening, or void. Therefore, it is possible to actively encourage the aquatic insects to inhabit such a space as a resting place or a hiding place.

In particular, when the block piece is porous, as in the case of the porous block piece, not only the surface of the block piece, but also the growth of microorganisms in the voids inside the block piece are promoted. , In terms of water purification,
It will be more preferable.

Further, when a raised portion or a depressed portion is formed on the bottom surface of the recess of the main body block, it is easy to make the flow state close to the rapid stream part of shallow water and the deep stagnation flow state as in a river in the natural world. It is preferable because it can be formed into a water body and the ecosystem of the water area can be made closer to nature.

When the inner surface of the recess of the main body block is formed to be uneven, mud and organic substances are likely to be deposited on the uneven portion, and microorganisms and the like can also propagate in that portion. When a plate made of porous concrete is fitted into the opening provided in the plate portion and / or the connecting portion of the plate portions, mud and organic substances also enter the voids to form a breeding ground for microorganisms and the like. It

Further, the floor guard block can not only protect the water channel floor portion, but also can form various flow states by various protrusion portions (projection portions formed by block pieces and gravel) on the upper surface thereof. In addition, the recesses, openings and voids of the block pieces can form habitats for aquatic insects and breeding grounds for aquatic plants.

[0021]

【Example】

[1] An embodiment of a fish nest block according to the present invention will be described below with reference to the drawings. First Embodiment In FIG. 1, a fish nest block 1 according to the present invention has a porous block piece 5 having a void 4 (FIG. 3) for biological growth arranged in a recess 3 of a main body block 2 as required. It is a thing.

As shown in FIG. 2, the main body block 2 is entirely formed as an integrally molded product of concrete,
An upper plate portion 7 and a lower plate portion 9 are provided so as to face each other in parallel at the upper and lower ends of a vertical substrate portion 6 having a rectangular plate shape, and the lower plate portion 9 is higher than the upper plate portion 7. Is also protruding long. Further, bolt holes 10 are provided in the upper and lower plate portions 7 and 9 in accordance with the arrangement of the block pieces 5. Further, connecting fittings 12 each having a bolt insertion hole 11 are provided in the middle of the upper edge of the left and right ends of the upper plate 7 and before and after the upper edges of the left and right ends of the lower plate 9.
There is provided a recess 13 for connection having an end portion.

As shown in FIGS. 1 and 3, the porous block piece 5 is formed as a flat plate made of porous concrete (having a porosity of about 30%, for example). Alternatively,
It is formed into a flat plate shape using various porous materials such as volcanic pumice and solidified resin granules. The insert 1 is attached to the upper and lower end face portions of the flat plate body or required portions of the flat face portion.
5 is embedded. The block piece 5 is housed in the recess 3 of the main body block 2 in a required arrangement, and the bolt 16 for inserting the bolt hole 10 provided in the plate portion is screwed into the insert 15 to be tightened, whereby the fish nest block is obtained. 1 is configured.

As shown in FIGS. 1 and 4, the block piece 5 has an inclined state 17a inclined with respect to the flow direction F (FIG. 14) in the fish nest to be constructed, and a parallel state 17b along the flow direction. An orthogonal state 17c orthogonal to the flow direction, and an inner surface abutting state 17d in which the flat surface abuts the bottom surface of the recess,
Inner surface contact state 17 in which the flat surface contacts the substrate surface of the recess
It is placed in the recess 3 with the appropriate combination of the required e. When the block pieces are arranged in an inclined state, a parallel state, or an orthogonal state, the block pieces are arranged so that open portions 19 are formed above and below the recess as shown in FIG. 3, for example.

Reference numeral 20 shown in FIG. 2 is a concrete reinforcing plate which is interposed at an appropriate position between the main body blocks to reinforce the fish nest.

The reinforcing plate 20 can close the open end portion 18 of the main body block 2, and has an insert 22 embedded therein in alignment with the bolt insertion hole 11 provided in the connecting fitting 12. The reinforcing plate 20 may be provided with a through hole portion 23 as shown by a chain line in FIG.

FIGS. 1 and 4 to 5 show a part of a fish nest 24 constructed by using the main body block 2 and the block pieces 5. In the fish nest, as shown in FIG.
Main body block 2 and 2 are bolt insertion holes for connecting fittings 1
After being connected by using fixing bolts 25 that pass through 1, 11, concave portions 13 are filled with mortar 26 as shown by dotted points in FIG. Further, the reinforcing plate 20 is interposed between the main body blocks at appropriate intervals (FIG. 4), and as shown in FIG. 7, a fixing bolt 25 which is inserted through the bolt insertion hole 11 of the connecting fitting is screwed into the insert 15 of the reinforcing plate 20. The main body blocks 2 and 2 are connected to each other via the reinforcing plate 20. After being connected using the fixing bolts 25 in this manner, the recesses 13 are filled with mortar 26 as shown by dotted points in FIG.

When the porous block 5 is arranged in an inclined state 17a which is inclined with respect to the flow direction F in the fish nest, a gentle flow corresponding to the inclination is obtained, and a parallel state 17b along the flow direction is obtained. When placed, the flow in that part is smooth. Further, when it is arranged in the orthogonal state 17c which is orthogonal to the flow direction, the back side thereof is stagnant. Further, when the flat surface is in contact with the bottom surface 27 of the recess in the inner surface contacting state 17d, mud and organic substances are likely to be deposited on the peripheral portion of the arranged block piece 5.

In the fish nest constructed in this way, mud and organic substances enter the voids of the block pieces, and the mud and organic substances accumulate on the inner surface (bottom surface etc.) of the recesses, and Microorganisms (aerobic or anaerobic microorganisms) and algae propagate in the voids inside and in the soil around the block pieces. Therefore, the water quality is purified by microorganisms, and various aquatic animals such as protozoa and insects are propagated by using this as a nutrient source. In addition, in search of these, fish and shellfish suitable for the flow conditions (rapid flow, gentle flow, reflux, stagnation, etc.) will gather and inhabit.

When the reinforcing plate 20 is provided with the through hole 23 as shown by the one-dot chain line in FIG. 2, the flow of water in the fish nest is continuous in the reinforcing plate. See also Figure 2
As shown by the alternate long and short dash line in FIG. 8 and as shown in FIG. 8, even if an opening 29 is provided in the lower plate portion 9 or the substrate portion 6 and a plate body 30 made of porous concrete is fitted and fixed in the opening portion 29, Good. In this case, the plate body 30 also serves as a breeding site for microorganisms.

FIG. 9 shows a case where the bottom portion of the recess 3 of the main body block 2 is formed in the concavo-convex portion 31 and has a structure in which mud or the like is easily deposited on the bottom portion. This unevenness 31
In addition to being integrally provided on the bottom surface of the recess, a part of the gravel may be embedded in the bottom surface of the recess. In the figure, the same parts as those shown in FIG. 2 are designated by the same reference numerals.

FIG. 10 shows another embodiment of the porous block piece 5, which is formed in a cylindrical shape. In addition, the porous block piece may be formed as various solid bodies such as a solid plate body and a solid columnar body, or as various hollow bodies such as a cylinder body with one end closed and a cylinder body with both ends closed. In particular, in the case of a porous block piece formed as a hollow body, dissolved oxygen does not sufficiently enter the hollow portion, and habit of anaerobic microorganisms is promoted, thereby purifying water quality.

Further, FIG. 11 shows a porous block piece 5 which is formed by filling gravel 33 in a mesh container 32 formed in a rectangular box shape.
Is illustrated.

FIG. 12 shows a fish nest 24 constructed by arranging the fish nest blocks 1 shown in the above-mentioned embodiment in parallel in a stepped portion of a river.

FIG. 13 shows a U-shaped body block 2,
The tip intermediate portions of the facing plate portions 7 and 9 are connected to each other by a columnar reinforcing member 30. FIG. 14 shows another mode of the U-shaped main body block 2, in which a plate-shaped reinforcing member 30 is fitted to the opening end portion of the recess 3 to form the plate portion 7,
It adheres to 9.

In FIG. 15, plate portions 7 and 9 are provided on a substrate portion 6 so as to be inclined and opposed to each other so that a concave portion 3 having a triangular cross section is formed, and the concave portion 3 is made of a porous material. 1 shows a fish nest block 1 to which a block piece 5 is fixed. Further, FIG. 16 shows that the plate portions 7 and 9 are projected in a state of being inclined and opposed to each other so as to form a recess 3 having a trapezoidal cross section, and the porous block piece 5 is provided in the recess 3. 1 shows a fish nest block 1 on which is fixed.

In FIG. 17, a porous block piece 5 is provided, for example, at the top of a recess 3 of a main body block 2 in which plate portions 7 and 9 are provided in parallel on both side edges of a horizontal substrate portion 6. It shows the fixed fish nest block 1, and the lower part 3 of its plate part
The fish nest 24 is constructed by embedding 5, 35 in the riverbed 36.

The porous block piece 5 is placed in a completely fixed state by means of the above-mentioned bolt fixing means, fitting fixing, embedded fixing, or the like, and the block piece 5 is placed between the gravel arranged in the recess. It may be arranged to hold the piece.

Second Embodiment FIGS. 18 to 19 show another embodiment of the fish nest block 1 according to the present invention, in which the recess 3 of the main body block 2 is
The block piece 39 having the downwardly opening concave portion 37, the block piece 41 having the opening 40 penetrating in the lateral direction, and the block piece 43 having the blind space 42 opened laterally are arranged as required.

The main body block 2 may be constructed in the same manner as that shown in the first embodiment, but in the present embodiment, the upper plate portion 4 is provided on the upper and lower ends of the vertical substrate portion 45.
6 and the lower plate portion 47 face each other in parallel and have a U-shaped cross section. Bottom part 49 of the recess 3 of the body block
As shown in FIG. 18, a part thereof may be raised (indicated by reference numeral 50) so as to have a stepwise shape when viewed in the cross section in the flow direction, or as shown by reference numeral 51 in FIG. Some may be depressed. The raised portion becomes a shallow water and a rapid flow portion is formed here, and the uptake of oxygen in the air is promoted. In addition, a deep flow portion is formed in the depressed portion. The bottom surface 52 of the depression and the bottom surface 53 of the recess may be connected by an inclined surface 54, as indicated by the alternate long and short dash line in FIG. In addition, the code | symbol 55 shows a water level line in FIGS.

The block pieces 39, 41, 43 can be formed by subjecting natural stone to notch processing or perforation processing, but it is formed porous using various porous materials such as porous concrete and volcanic pumice stone. Is good. The recess 37 and the opening 40 formed by these processes can be formed in various shapes such as a rectangular shape and a circular shape.

Similar to the porous block piece 5 in the above-mentioned embodiment, these block pieces have the recess 37, the opening 40 penetrating therethrough, or the opening of the blind cavity 42 in a fish nest to be constructed. Tilted state 56a (FIG. 18) with respect to the flow direction in FIG.
6b (FIG. 18) and an orthogonal state 56 orthogonal to the flow direction
It is placed in the recess 3 so as to present c (FIG. 19). Then, in the arranged state, for example, in the same manner as shown in FIG. 3, a bolt inserted through a bolt hole provided in the plate portion is screwed into an insert embedded in the bottom surface portion of the block piece and tightened, whereby the block piece is formed. It is fixed in the recess. Alternatively, the lower end portion of the block piece is embedded and fixed in the bottom surface of the recess.

As shown in FIG. 18, the block piece 3
It is preferable to dispose gravel 57 around 9, 41 and 43, and the gravel may be fixed to the bottom surface of the recess in the same manner as described above. If gravel is placed on the bottom of the recess,
The block pieces may be held between the gravel.

In the case of a fish nest constructed using the fish nest block having such a configuration, the recess 37, the opening 40 and the void 42 of the block piece provide a space close to the space behind the stone in the floating stone of the river in the natural world. Can be formed,
It is possible to actively encourage the aquatic insects to live in such a space as a resting place or a hiding place. In particular, when the block piece is porous, the porous block piece 5
Similarly to the above, the reproduction of microorganisms and the like in the voids in the inside is promoted, which is advantageous for water purification. Further, when the gravel is arranged around the block piece, a gap can be formed between the gravel and a stagnation state can be formed on the back side of the gravel. In addition, as described above, by providing the raised portion or the depressed portion to form the rapid current portion or the stagnation portion, and by making a three-dimensional change in the bottom of the fish nest, the state of the river in nature can be brought closer. In addition, such a configuration in which the raised portion and the depressed portion are provided can be similarly adopted in the first embodiment.

In these fish nest blocks, the block piece 5 of the porous plate body shown in the above embodiment may be used together. In that case, in the same manner as shown in FIG. 1, the block piece is in a tilted state (one example is shown by reference numeral 58 in FIG. 19) in the fish nest to be constructed and in a parallel state along the flow direction. An orthogonal state orthogonal to the flow direction, and an inner surface abutting state in which the flat surface abuts the bottom surface of the recess,
An appropriate combination of the inner surface abutting state in which the flat surface abuts the base plate surface of the recess is arranged in the recess 3.
By doing so, various flow states can be easily created.

[2] Next, an embodiment of the water channel structure according to the present invention will be described with reference to the drawings. FIG. 18 also shows an example of the water channel structure according to the present invention, in which the floor 59 of the water channel is connected to the bottom of the recess 3.
The protection bed blocks 60 are arranged side by side. The protection floor block 6
In the same manner as in the bottom of the recess of the fish nest, 0 has the same configuration as the block piece, which has a recess 61 that opens downward, an opening 62 that penetrates in the lateral direction, and a blind space 63 that opens laterally. The block piece 64 of, for example, the lower end portion of the substrate 6
It is embedded in the upper surface of 6 and fixed to the substrate. Further, the lower end portion of the gravel 57 is embedded in the upper surface of the substrate and around the block piece 64.

The floor protection block 60 having such a structure can not only protect the water channel floor but also various flow states by the projections of various shapes on the upper surface of the block. Further, a habitat for aquatic insects and a breeding ground for aquatic plants can be formed on the inner surface of the recess of the block piece, the inner surface of the through hole, or the inner surface of the void. By adding the action effect based on such a protection bed block to the action effect of the fish nest block, the ecosystem of the water area can be brought closer to the state of the river in the natural world.

Incidentally, the floor protection block 60 may be constructed by only disposing the block pieces 64 on the upper surface of the substrate. Further, the block piece 64 may be arranged on the substrate by fixing it with bolts or holding it between gravel in the same manner as in the fish nest block.

[0049]

The present invention has the following excellent effects. Regarding fish nest block One aspect of the fish nest block according to the present invention is to arrange a porous block piece in a recess of a main body block as required, so that various flow conditions (rapid flow) in rivers in the natural world can be obtained. Or gentle flow, reflux, stagnation, etc.) can be easily formed (especially when the block piece has a flat plate shape, it becomes easier to regulate the flow state). Further, it is possible to allow mud or organic matter to enter the voids of the block piece to promote the growth of microorganisms on the surface portion or voids of the block piece, and to deposit mud or organic matter in the recesses to prevent the presence of microorganisms in the soil. It can promote the reproduction of algae. From this, it is possible to purify water quality by microorganisms, and use this as a nutrient source to inhabit various aquatic animals such as protozoa and insects, and artificially create an environment where various kinds of fish gather in search of this. It will be possible to make.

In another embodiment of the fish nest block according to the present invention, a block piece having a recess for downward opening, an opening penetrating in the lateral direction, or a space opening laterally is required in the recess of the block body. It is to be placed. Therefore, the flow state in the fish nest can be variously changed according to the arrangement state of the block pieces (particularly, when the block pieces have a flat plate shape, the regulation of the flow state becomes easier), It is possible to promote the growth of microorganisms on the surface part of the soil, and to accumulate the mud and organic matter in the recesses to promote the growth of microorganisms and algae in the soil. In addition, the recesses, openings, or voids in the block pieces can form a space that is close to the space behind the stones in the fluff of a natural river, and aquatic insects that use such a space as a resting place or hiding place. Can actively encourage the habitation of. In particular, when the block piece is porous, the growth of microorganisms and the like in the voids inside the block piece is promoted, which is advantageous for water purification. Furthermore, by combining the above-mentioned fish nest block with the above-mentioned porous flat plate block pieces in a required arrangement, various flow states can be easily created, and the state of rivers in the natural world can be further approximated.

In addition, in the fish nest block of each of the above-described modes, a raised portion or a depressed portion is provided on the bottom surface of the recess of the block body to form a rapid flow portion or a stagnation portion, and a three-dimensional change is added to the bottom of the fish nest. By doing so, it is possible to bring it closer to the state of rivers in the natural world. From the above, when the fish nest block according to the present invention is used, it is possible to construct an ideal fish nest close to the nature where fishes easily live.

Regarding the canal structure In the case of the canal structure of the present invention in which a guard bed block is arranged on the floor of the canal so as to be continuous with the bottom of the recess of the fish nest block, the canal block can only protect the canal floor. Instead, various flow states can be formed by various projecting portions (projecting portions formed by block pieces or gravel) on the upper surface of the block. In addition, due to the recesses, openings and voids of the block pieces, it is possible to form habitats for aquatic insects and breeding grounds for aquatic plants as described above.

Therefore, according to the waterway structure according to the present invention, the synergistic effect of the action of the fish nest block and the action effect of the protection bed block can bring the ecosystem of the water area closer to the state of the river in the natural world. Will greatly contribute to environmental conservation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a fish nest block in its connected state.

FIG. 2 is a perspective view illustrating a main body block and a reinforcing plate that form a fish nest block.

FIG. 3 is a cross-sectional view showing a state in which a porous block is bolted to a main body block.

FIG. 4 is an explanatory diagram illustrating an example of an arrangement state of porous blocks.

FIG. 5 is a cross-sectional view illustrating an example of a constructed fish nest.

FIG. 6 is a plan view showing a state where main body blocks are fixed to each other by bolts.

FIG. 7 is a plan view showing a state in which a main body block and a reinforcing plate are fixed by bolts.

FIG. 8 is a cross-sectional view showing a state in which a plate made of porous concrete is fitted and fixed in an opening provided in the plate.

FIG. 9 is a perspective view showing a main body block in which a bottom of a recess has an uneven portion.

FIG. 10 is a perspective view showing another aspect of the porous block.

FIG. 11 is a perspective view illustrating another aspect of the porous block.

FIG. 12 is a cross-sectional view showing a fish nest constructed by arranging fish nest blocks side by side in a stepped portion of a river.

FIG. 13 is a perspective view showing a main body block in which a middle portion of the tip of the plate portion is connected by a reinforcing member.

FIG. 14 is a perspective view showing a main body block in which a reinforcing member is fitted and fixed to an opening end portion of a recess.

FIG. 15 is a cross-sectional view showing a fish nest constructed using a fish nest block having a recess having a triangular cross section.

FIG. 16 is a cross-sectional view showing a fish nest constructed using a fish nest block having a trapezoidal recess in a horizontal cross section.

FIG. 17 is a cross-sectional view showing a fish nest constructed by burying the lower portion of the plate portion of the inverted U-shaped fish nest block in the river bed.

FIG. 18 is a perspective view showing another aspect of the fish nest block together with a water channel structure constructed using the fish nest block.

FIG. 19 is a cross-sectional view illustrating another aspect of the fish nest block.

[Explanation of symbols]

 1 Fish Nest Block 2 Body Block 3 Recess 4 Pore 5 Porous Block 6 Substrate 7 Plate 7 Plate 29 Opening 30 Porous Concrete Plate 31 Concavity 37 Concave 39 Block 40 Open 41 Block 42 Empty Place 43 Block piece 45 Board part 46 Upper plate part 47 Lower plate part 57 Gravel 60 Floor protection block 61 Recess 62 Opening 63 Empty space 65 Block piece 66 Board

Claims (16)

[Claims] 1. A porous body having a void for biological growth in the recess of a concrete main body block in which base end portions of opposed plate portions are connected to each other to form a recess between the plate portions. A fish nest block characterized by arranging block pieces as required. 2. The block piece is placed in the recess of the main body block by embedding a part of the block piece in the inner surface of the recess, or by fixing the block piece to the inner surface of the recess by bolt fixing means. The fish nest block according to claim 1, wherein the fish nest block is arranged as required. 3. The fish nest block according to claim 1, wherein the block piece is formed as a solid body or a hollow body made of porous concrete. 4. The block piece is formed as a porous flat plate body, and its arrangement state is such that the plate body is inclined with respect to the water flow direction in the recess of the main body block,
At least one of a parallel state along the flow direction of water in the recess, an orthogonal state orthogonal to the flow direction of water in the recess, and an inner surface abutting state in which the flat surface abuts the inner surface of the recess. The fish nest block according to claim 1, wherein: 5. A block piece, which has a recess for downward opening, in the recess of a concrete main body block formed by connecting the base ends of opposing plate parts to each other to form a recess between the plate parts. A fish nest block, in which at least one of a block piece having an opening penetrating in a direction and a block piece having a laterally open space is arranged as required. 6. The block piece is embedded in the recess of the main body block by embedding a part of the block piece in the inner surface of the recess, or by fixing the block piece to the inner surface of the recess by bolt fixing means. The fish nest block according to claim 5, wherein the fish nest block is arranged as required. 7. The fish nest block according to claim 5, wherein the block piece has a flat plate shape. 8. The block piece is a porous piece having voids for biological growth.
The described fish nest block. 9. The fish nest block according to claim 5,
A fish nest block, characterized in that the block piece formed as a porous flat plate having voids for biological growth is provided in the arrangement state according to claim 4. 10. The fish nest block according to claim 1, wherein a raised portion and / or a depressed portion is provided on the bottom surface of the recess of the main body block. 11. The fish nest block according to claim 1, wherein the inner surface of the recess is uneven. 12. The fish nest block according to claim 1 or 5, wherein the front end portions or the side end portions of the facing plate portions of the main body block are connected by a reinforcing member. 13. The fish nest according to claim 1, wherein an opening is provided in the plate portion and / or a connecting portion between the plate portions, and a plate body made of porous concrete is fitted into the opening portion. block. 14. The fish nest block according to claim 1 or 5 is arranged on the shore of the water channel so that the recess of the main body block is opened inwardly of the water channel, and the fish nest block is connected to the bottom of the recess. A guard floor block is mounted on the floor of the waterway, and the guard floor block has a block piece having a recess for downward opening, a block piece having an opening penetrating in the lateral direction, and a cavity opened laterally. A water channel structure in which at least one of the block pieces is arranged on the upper surface of the substrate as required. 15. The block piece is arranged on a substrate as required by embedding a part of the block piece in the inner surface portion of the recess or by fixing the block piece to the inner surface portion of the recess by bolt fixing means. The waterway structure according to claim 14, wherein 16. The water channel structure according to claim 13, wherein gravel is disposed as required on the upper surface of the substrate and around the block piece.