JPH05179629A - Revetment having fish gathering place - Google Patents

Abstract

PURPOSE:To provide a sturdy revetment which is capable of being easily constructed, suitable for waterways with different inclinations of the slope, capable of being used as safe stairways while walking in the waterways, and provide wide fish-gathering places which are close to the natural environment and suitable for aquatic organism of fish, shell fish, crabs or the like. CONSTITUTION:Fish-gathering blocks 1 are used which are provided with bottom boards 2, longitudinal walls 3 which are vertically provided on the rear end part of the bottom boards and extend in the transverse direction, receiving walls 5 which are vertically provided on the front end part of the bottom boards and extend in the transverse direction, and supporting walls 4 which are provided horizontally in a protruded manner from the upper end of the longitudinal walls 3 to the forward part. Lower stages are formed by providing the fish-gathering blocks 1 in a row to the slope surface 15 of the waterway so that the rear surface of the longitudinal walls 3 may face toward the slope surface 15, while upper stages are formed in a row by providing the following fish-gathering blocks 1 on the upper surface of the longitudinal walls 3 and the supporting walls 4 of the fish-gathering blocks 1 of the lower stage so that the rear surface of the longitudinal walls 3 may face toward the slope surface 15. Then, the upper surfaces of gravel-receiving walls 5 on the lower and the upper stages are arranged stepwise to construct the revetment having a fish-gathering place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to revetments for waterways such as rivers and artificial canals, and more particularly to revetments with fish nests suitable for habitat of aquatic organisms such as fish, shellfish and crabs.

[0002]

2. Description of the Related Art The following are known as fish nests in conventional waterways. (1) As described in Japanese Utility Model Publication No. 1-90821, a square box-shaped fish nest block having an internal space surrounded by a wall with an opening is used, and this fish nest block is used as a slope of a waterway. A seawall with fish nests that is simply piled up along the line and the fronts of these fish nest blocks are arranged flush with each other like a wall.

(2) As described in Japanese Utility Model Laid-Open No. 59-69226, a slanted plate along the slope of a waterway, a vertical wall erected at the rear end thereof, and horizontally from the upper end of the vertical wall to the front. Use a fish nest block consisting of protruding horizontal walls and the space between them so that the rear end of the slope plate of this fish nest block abuts the front end of the slope plate of the next fish nest block. A seawall with a fish nest in which the horizontal walls are arranged in a staircase pattern by arranging them on the slope of the waterway.

(3) As described in Japanese Utility Model Laid-Open No. 3-79325, a flat rectangular base portion, a rear vertical wall and a front vertical wall erected at a rear edge portion and a front edge portion, and an upper end of the rear vertical wall. A step structure with a fish depression that uses a fish nest block consisting of a horizontal wall that is connected to the fish nest block and fills this fish nest block in a waterway at a distance from each other.

[0005]

However, the conventional fish nest has the following problems. First, in the seawall with fish nest in (1) above, the fish nest is formed inside the nest block of the fish nest, the shape is quite different from the natural depression, and the water inside does not circulate so much, so the fish It was hard to say that it was the most suitable environment for living. In addition, since there is little direct sunlight coming into the fish nest, the water temperature is unlikely to rise, and there is a problem that aquatic plants such as aquatic plants and algae, which are preferable for habitat of fish, do not grow well.

Further, in the above-mentioned (2) revetment with a fish nest, the fish nest is formed in the space between the slant board of the fish nest block and the vertical wall and the horizontal wall, and especially the upper surface of the slant board is inclined. Therefore, there is a problem in that it is impossible to lay gravel, stones or boulders suitable for habitation of fish on the upper surface. In addition, there is a problem that this fish nest block must be manufactured each time by adjusting the inclination angle to the slope different for each waterway.

Further, in the step construction with a fish depression of the above (3), since the fish nest is formed in a gutter shape by the base portion of the fish nest block, the left vertical wall and the right vertical wall, The problems of () and (2) in fish nests are improved. However, this fish nest block is for forming a head drop construction, does not disclose a revetment on a slope, and does not disclose the idea of accumulating fish nest blocks.

Therefore, an object of the present invention is to easily construct a strong revetment adapted to waterways with different slopes, to use it as a safe stair when walking in waterways, and to use fish, It is to provide a new seawall with a fish nest capable of forming a fish nest close to nature suitable for aquatic organisms such as shellfish and crabs over a wide area.

[0009]

In order to achieve the above-mentioned object, the seawall with a fish nest of the present invention comprises a bottom plate, a vertical wall extending in the left-right direction upright at the rear edge of the bottom plate, and the bottom plate. Using a fish nest block provided with a receiving wall extending in the left-right direction, which is erected on the front edge of the vertical wall, and a supporting wall protruding forward from the upper end of the vertical wall, and the fish is placed on the slope of the waterway. Nest blocks are lined up so that the rear surface of the vertical wall faces the slope, forming the lower stage,
On the upper surface of the vertical wall and the support wall of the lower fish nest block, the next fish nest block is arranged in line so that the rear surface of the vertical wall faces the slope to form the upper stage, and the lower fish nest block of the lower nest block is received. The upper surface of the retaining wall and the upper surface of the retaining wall of the fish nest block in the upper stage were arranged in a stepwise fashion (claim 1).

Further, a bottom plate, a vertical wall extending in the left-right direction which is erected on the rear edge of the bottom plate, a receiving wall extending in the left-right direction which is erected on the front edge of the bottom plate, and the bottom plate of the bottom plate. A fish nest block provided with a support wall erected in the middle was used to construct the revetment with the fish nest in the same manner (claim 2).
In this seawall with a fish nest, it is preferable to provide a fitting recess on the bottom surface of the bottom plate of the fish nest block with which the upper surface of the vertical wall or the support wall fits (claim 3).

In the revetment with a fish nest according to the first aspect, the roadway or sidewalk can be extended or displaced to above the support wall of the fish nest block at the uppermost stage (claim 4). In the seawall with a fish nest according to claim 2, a lid is covered between at least the upper surface of the vertical wall and the upper surface of the support wall of the uppermost fish nest block, and the roadway or sidewalk is extended above the lid. Alternatively, it can be formed with displacement (claim 5).

Further, the following means can be adopted in the seawall with a fish nest according to the first or second aspect. (1) The relative position in the front-rear direction of the upper fish nest block and the lower fish nest block is changed between rows (claim 6). (2) Mixed use of fish nest blocks having different heights (Claim 7).

(3) A spacer block thinner than the fish nest block is interposed between the upper fish nest block and the lower fish nest block (claim 8). (4) The rows of some of the fish nest blocks are separated from each other, and stair blocks are stacked between the rows (claim 9). It is preferable that a hollow portion be provided between both side surfaces of the staircase block (claim 10).

In each of the above means, the terms "upper" and "lower" mean relatively upper and lower steps, of course, and are not limited to two steps, depending on the height of the slope of the water channel. You can build a seawall with three or more steps.

[0015]

The seawall with a fish nest according to the first or second aspect of the invention has the following functions. First, since the first half of the bottom plate of the upper fish nest block is supported by the vertical walls and the upper surfaces of the supporting walls of the lower fish nest block, there is no risk of falling forward and it is sufficiently stabilized by its own weight. In addition, by changing the relative positions of the upper and lower fish nest blocks, it can be adapted to waterways with different slopes. Moreover, since the upper surfaces of the upper and lower receiving walls are arranged in a staircase shape, the upper surfaces serve as a safe staircase when walking in a waterway.

Further, a fish nest close to nature suitable for habitat of aquatic organisms such as fish, shellfish and crab is formed over a wide area for the following reason. First, for each fish nest block of each stage, a shallow shallow fish nest is formed on the upper surface of the bottom plate. Also,
Since the upper surface of the bottom plate is horizontal, it is possible to lay gravel, cobblestone, or cobblestone (in this order, increasing in size) alone or in combination at a uniform height or in an uneven shape. In the sense of changing the fish nest, it is preferable to lay it in a concavo-convex shape by combining gravel, cobblestone, or cobblestone. This gravel,
Crushed stones or cobblestones are prevented from spilling forward by the receiving wall and are held on the upper surface of the bottom plate, forming a favorable environment for activities such as fish and spawning.

Further, since direct sunlight is appropriately exposed to the fish nest from between the upper end of the receiving wall and the front end of the support wall, the water temperature is appropriately increased, and an environment suitable for the growth of aquatic plants such as aquatic plants and algae is provided. To form. In addition, since the shade is appropriately formed below the support wall, a good environment for resting fish and the like is formed. Moreover, because the fish nest is a shallow depression along the water flow, the water circulation is very good, creating an environment rich in oxygen and nutrients.

Next, according to the revetment with a fish nest according to claim 3, since the upper wall of the lower fish nest block or the upper surface of the supporting wall is fitted into the fitting recess of the upper fish nest block, Displacement of the lower fish nest block is reliably prevented.

Further, according to the seawall with a fish nest according to the fourth or fifth aspect, since the roadway or the sidewalk is formed by extending or displacing to the upper side of the support wall or the lid of the uppermost fish nest block, The roadway or sidewalk is wider than before.

Next, according to the seawall with a fish nest according to claim 6 or 7, since the fish nest is displaced in the front-back direction or the up-down direction between the rows of the fish nest blocks, it is more varied and suitable for activities such as fish. A fish nest is formed.

Further, according to the seawall with a fish nest according to the eighth aspect, the height of the seawall can be adjusted by the spacer block, and a gap formed between the spacer blocks and between the upper and lower fish nest blocks is formed. It becomes an evacuation site for fish, etc.

According to the seawall with a fish nest according to the ninth aspect, since the water flow in the fish nest can be mitigated by the stair block, the juvenile fish can be protected from the water flow and the spawning activity of the adult fish is facilitated. In addition, since the stair block can be installed so that the user can walk in the waterway more easily and safely, it is possible to prevent water accidents such as slippage at the revetment.

Further, according to the seawall with a fish nest according to the tenth aspect, the hollow portion prevents the stairs block from interfering with the fishway function of the fish nest block, and forms a dark portion which is comfortable for the fish and the like to live in. ..

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a seawall with a fish nest according to a first embodiment of the present invention will be described with reference to FIGS. First, the fish nest block 1 used in this example is molded into a shape as shown in FIG. 1 with concrete in which reinforcing reinforcing bars are embedded, and the thickness of each part is 200 mm. It should be noted that the dimensions of each part shown in the present embodiment are mere examples, and can be of course appropriately changed.

This fish nest block 1 is provided with a horizontal bottom plate 2 formed in the shape of a rectangular plate, and its lateral length is 1980.
mm, the width in the front-back direction is 2000 mm. A vertical wall 3 extending in the left-right direction is integrally erected on the rear edge of the bottom plate 2,
The height from the bottom surface of the bottom plate is 1000 mm. Vertical wall 3
A support wall 4 horizontally projecting forward is integrally formed at the upper end of the, and the projecting width from the rear surface of the vertical wall is 1000 mm.

A receiving wall 5 extending in the left-right direction is integrally erected on the front edge of the bottom plate 2, and its length in the left-right direction is 1830 mm, which is shorter than that of the bottom plate 2, and its height from the top face of the bottom plate is 3.
It is 00 mm. Therefore, an escape path 6 in the front-rear direction is formed on the right side of the receiving wall 5 at this front edge portion, and the opening width thereof is 150 mm.

A blocking wall 7 extending in the front-rear direction is integrally provided upright in the middle of the left edge of the bottom plate 2. The width in the front-rear direction is 1100 mm, which is shorter than that of the bottom plate 2, and the height from the top face of the bottom plate is 2. It is 150 mm. Therefore, a left-right escape path 8 is formed between both ends of the blocking wall 7 and the vertical wall 3 and the receiving wall 5 at the left edge portion, and the opening width thereof is 250 mm.

Grooves are formed longitudinally and laterally at intervals of 100 mm on the front surface 9 of the support wall 4 and the front surface 10 of the receiving wall 5 to form an uneven surface in a lattice pattern. This uneven surface contributes to improving the natural feeling of the landscape and fish nests. Further, the bottom plate 2 and the support wall 4 are formed with connection holes 11 for passing bolts that connect the fish nest blocks 1 when the fish nest blocks 1 are stacked vertically.

Next, the seawall with a fish nest of this embodiment is constructed using the fish nest block 1 as shown in FIGS. Chest stones 16 are laid on the lower upper surface of the slope 15 of the water channel, and waste concrete 17 is cast on the stones 16. On the upper surface of this waste concrete 17, fish nest blocks 1 are placed and lined up with the rear surface of the vertical wall 3 facing the slope 15, and on the upper surface of the bottom plate 2, gravel, cobblestone or cobblestone (hereinafter referred to as cobblestone 18 Which are singly or in combination and laid at a uniform height or in a concavo-convex shape to form the first stage.

Between the vertical wall 3 of the first stage and the slope 15, crushed stones 16 are packed, and on the crushed stones 16, waste concrete 17 is cast. At the upper surface of the vertical wall 3 and the support wall 4 at the first stage and the upper surface of the waste concrete 17, that is, at the position shifted rearward from the first stage, the next fish nest block 1
Are placed and lined up with the rear surface of the vertical wall 3 facing the slope 15, and the second stage is formed by laying stones 18 on the upper surface of the bottom plate 2. Therefore, the upper surfaces of the first and second receiving walls 5 are arranged in a staircase pattern. Similarly, above the second-stage fish nest block 1, a third-stage structure is formed by arranging the next fish nest block 1 in rows and laying stones 18 or the like.

Since the second and third fish nest blocks 1 are sufficiently stabilized by their own weight, they need only be placed on the lower fish nest block 1 and the waste concrete 17, respectively. However, the connecting hole 11 between the upper base 2 and the lower support wall 4
By connecting these through bolts (not shown), it is possible to prevent the displacement of the fish nest block 1 comrades more reliably, and to connect the fish nest block 1 comrades when riverbed excavation, ground subsidence, etc. occur. Can be kept flexible.

The upper fish nest block 1 may be stacked directly above the lower fish nest block 1 as shown in FIG. 2 or in a staggered manner as shown in FIG. In either case, the bolts can be connected.

Further, by changing the relative positions of the upper and lower fish nest blocks 1 as follows, it is possible to easily construct a revetment suitable for each of various waterways having different slopes. .. As shown in FIG. 2 or FIG. 3, if the front surface 10 of the upper receiving wall 5 is made flush with the front surface 9 of the lower supporting wall 4, the slope of the slope (according to the British formula, The horizontal distance is the same as the above. The same applies to the case where 10% (1: 1).

As shown in FIG. 4, the upper receiving wall 5
If the front surface 10 of the support wall 4 is made to project forward from the front surface 9 of the lower support wall 4, the slope of the slope is, for example, 5 minutes (1: 0.
It adapts to a sudden case like 5). As shown in FIG. 5, when the front surface 10 of the upper receiving wall 5 is made to recede rearward from the front surface 9 of the lower supporting wall 4, the slope of the slope becomes, for example, 20% (1: 2). Adapt to loose.

As shown in FIG. 6, a roadside block 42 for fixing the guardrail 41 is arranged above the support wall 4 of the fish nest block 1 in the third stage, and a sidewalk made of cast-in-place concrete. 43 is in front of the past (waterway side)
It may be formed by displacing to. In this case, driveway 44
Is widened by the amount of displacement of the sidewalk 43 in the related art.

Since the seawall with a fish nest of this embodiment is constructed as described above, the following actions and effects are obtained. (1) Since the first half of the bottom plate 2 of the upper fish nest block 1 is supported by the vertical walls 3 and the upper surfaces of the supporting walls 4 of the lower fish nest block 1, there is no risk of falling forward, and as described above To be sufficiently stable. Therefore, a strong seawall can be easily constructed.

(2) As described above, by changing the relative positions of the upper and lower fish nest blocks 1, it is possible to easily construct a seawall adapted to each of the waterways having different slopes. (3) Since the upper surfaces of the upper and lower receiving walls 5 are arranged in a staircase, this upper surface can be used as a safe stairway when walking in a waterway.

(4) Due to the following reasons, it is possible to form a near-natural fish nest suitable for habitation of aquatic organisms such as fish, shellfish and crab over a wide area. On the upper surface of the bottom plate 2 of the fish nest block 1, a shallow and wide depression surrounded by the vertical wall 3, the receiving wall 5 and the blocking wall 7 is formed, and this depression forms a fish nest close to nature. Further, since this fish nest is formed for each fish nest block 1 in each stage, the total area thereof is extremely large.

Since the top surface of the bottom plate 2 is horizontal, as described above, the stone 18 or the like can be laid in a uniform height or in an uneven shape. The stones 18 are held on the top surface of the bottom plate 2 because the receiving wall 5 prevents the spilled stones from falling forward and the blocking wall 7 prevents the washout in the left-right direction (water flow direction). The cobblestones 18 thus retained form a favorable environment for activities such as fish and spawning.

From the upper end of the receiving wall 5 and the front end of the supporting wall 4, direct sunlight shines on the fish nests moderately, so that the water temperature rises moderately, and an environment good for the growth of aquatic plants such as aquatic plants and algae. To form. An appropriate shade is formed below the support wall 4, so that an environment good for resting fish and the like is formed. Since the fish nest is a shallow depression along the water stream, the water circulation is very good, forming an environment rich in oxygen and nutrients.

(5) Since the escape passages 6 in the front-rear direction are formed between the adjacent receiving walls 5, and the escape passages 8 in the left-right direction are formed on both sides of the blocking wall 7, the water surface level of the water channel. When the fish is going down and water is about to be drawn from the fish nest, the fish can escape from the fish nest through the escape paths 6 and 8 to the lower nest or water channel.

(6) As shown in FIG. 6, when the sidewalk 43 is formed to be displaced above the support wall 4 of the fish nest block 1 in the third stage, the width of the roadway 44 becomes wider than the conventional one. Therefore, a large vehicle such as the truck 45 can easily pass through.

Next, a seawall with a fish nest according to the second embodiment of the present invention will be described with reference to FIGS. First, the fish nest block 21 used in the present embodiment is molded into a shape as shown in FIG. 7 from concrete in which reinforcing reinforcing bars are embedded.

This fish nest block 21 is provided with a horizontal bottom plate 22 formed in a square plate shape, and the left end face and the right end face thereof are slopes with a downward spread, and the length of the bottom face in the left-right direction is 1
800 mm, width in the front-back direction is 2000 mm, thickness is 20
It is 0 mm. A vertical wall 23 extending in the left-right direction is integrally provided upright at the rear end of the bottom plate 22, and the length in the left-right direction is 2
The height from the bottom surface of the bottom plate is 1000 mm. The front surface of the vertical wall 23 is an inclined surface, and the inclination thereof is 1 minute.

A pair of support walls 24 are integrally erected at the central portions of the left and right edges of the bottom plate 22, and the height from the top surface of the bottom plate is 800 mm. The facing surface of both support walls 24 is an inclined surface, and the slope thereof is 5 minutes. A through hole 28 is formed in the center of the bottom plate 22 so as to extend downwardly from the facing surface. Also, both support walls 2
The front and rear surfaces of No. 4 are also inclined surfaces, and their slope is 1.5 minutes.

At the front edge of the bottom plate 22, a trapezoidal receiving wall 25 extending in the left-right direction is integrally erected. The upper surface of the receiving wall 25 has a horizontal length of 800 mm, which is higher than the upper surface of the bottom plate. The length is 800 mm. Therefore, the receiving wall 25
The left side and right side of is a slope with a 5 minute slope,
An escape path 2 in the front-rear direction that widens toward the left and right of them
6 is formed. In addition, a through hole 29 continuous to the upper surface of the bottom plate 22 is provided at the center of the receiving wall 25 to form a tapered hole that expands forward. The rear surface of the receiving wall 25 is an inclined surface, and the inclination thereof is 1 minute.

A plurality of flat convex strips 30 extending in the left-right direction are integrally formed on the lower surface of the bottom plate 22 at intervals, and the upper surfaces of the vertical wall 23 and the support wall 24 are fitted between them. A fitting recess 31 having a width of 250 mm is formed.

Next, the seawall with a fish nest of this embodiment is constructed by using the fish nest block 21 to form the first stage, the second stage and the third stage as shown in FIGS. It The construction method is basically the same as that of the first embodiment, but the upper surfaces of the lower vertical wall 23 and the support wall 24 are fitted in the upper fitting recess 31. Further, as shown in FIG. 9, above the third-stage fish nest block 21, the upper surface of the vertical wall 23 and the support wall 24.
In some cases, the lid 32 is covered with the upper surface of the, or as shown in FIG. 10, the entire upper surface from the vertical wall 23 to the receiving wall 25 is covered with the lid 32.

As in the first embodiment, the upper fish nest block 21 may be stacked directly above the lower fish nest block 21 or may be stacked in a staggered manner. Further, by changing the relative positions of the upper and lower fish nest blocks 21 as shown in FIGS. 8 to 10, the slope gradient is, for example, 5 minutes or more.
It is possible to easily construct a seawall adapted to each of different waterways, such as 20%.

Further, as shown in FIG. 11, a roadside block 42 for fixing the guardrail 41 is provided in a row at the front edge of the lid 32 which covers the fish nest block 21 of the third stage. The road 44 may be expanded and formed.

Since the seawall with a fish nest of this embodiment is constructed as described above, the same operation and effect as the first embodiment (1)
In addition to (6), the following actions and effects are exhibited. (7) As described above, the lower vertical wall 23 is provided in the upper fitting recess 31.
Since the upper surface of the support wall 24 and the upper surface of the support wall 24 are fitted to each other, it is possible to reliably prevent the upper and lower fish nest blocks 21 from being displaced, particularly from being displaced in the front-rear direction.

(8) Since the front surface of the vertical wall 23, the confronting surface and the front and rear surfaces of the support wall 24, and the slope facing surface of the receiving wall 25 are inclined surfaces, compared to the upright surface, It is suitable for arthropods such as crabs, crayfish, and hermit crabs to climb up and down, creating an environment in which they are easy to work.

(9) Further, through holes 28 and 29 are formed in the bottom plate 22 and the receiving wall 25, and these holes are provided in the vertical wall 23, the supporting wall 24 and the receiving wall as shown in FIGS. 8 to 11. Since each of the inclined surfaces of 25 is located at the upper and lower ends of the inclined surface or in the vicinity thereof, crabs or the like climbing or descending the inclined surface are not covered with the through holes 28, 29.
It is easy to move to the upper or lower fish nest through Therefore, an environment more suitable for activities such as crabs is formed. Further, the through hole 29 also functions as an escape path in the front-rear direction.

Next, the revetment with fish nests according to the third embodiment shown in FIGS. 12 and 13 will be described. In this embodiment, the relative positions of the upper and lower fish nest blocks 1 in the front-rear direction are as follows. The difference from the first embodiment is only in the changes as described above. That is, in the central portion of the figure, the front surface 9 of the lower support wall 4 and the front surface 10 of the upper receiving wall 5 are flush with each other, but in the several rows on the left side, The front surface 9 gradually recedes rearward from the front surface 10 of the upper receiving wall 5, and in the right-hand several rows,
The front surface 9 of the lower support wall 4 is the front surface 10 of the upper receiving wall 5.
It gradually protrudes forward. The laying of cobblestones and the like are the same as those in the first embodiment, and therefore the illustration is omitted (the same applies in the following embodiments).

This embodiment has the following operations and effects in addition to the operations and effects (1) to (6) similar to those of the first embodiment. (10) Since the fish nests on the upper surface of the fish nest block 1 are displaced in the anteroposterior direction between the rows, fish nests more varied and suitable for activities such as fish are formed.

Next, the seawall with a fish nest of the fourth embodiment shown in FIG. 14 will be explained. In this embodiment, some fish nest blocks 34 are different in height from other fish nest blocks 1. It is different from the first embodiment only in the point. That is, in the same figure, the fish nest blocks 34 whose height is 2/3 of the other fish nest blocks 1 are used in the second row to the fourth row in the left row, and these are the second row in the right row and The fish nest blocks 1 on the third stage are adjacent to each other. Also,
In the fish nest block 34, blocking walls 7 are erected on both left and right edges to prevent falling of stones and the like laid on the bottom plate 2.

This embodiment also has the following operations and effects in addition to the operations and effects (1) to (6) similar to those of the first embodiment. The height of the fish nest block 34 can be changed as appropriate, and for example, 1/2, 3/4, 3/2 of other fish nest blocks 1,
It may be 2/1 or the like. (11) Since the fish nests on the top surface of the fish nest block 1 are vertically displaced in the direction in which the fish nest blocks are arranged, fish nests more varied and suitable for activities such as fish are formed.

Next, the revetment with a fish nest according to the fifth embodiment shown in FIG. 15 will be described. In this embodiment, a height of 100 to 300 mm and a width of 15 are provided between the upper and lower fish nest blocks 1.
It is different from the first embodiment only in that spacer blocks 35, 36, 37 of 0 to 500 mm are interposed. That is, the front surface 9 of the first-stage support wall 4 and the front surface 10 of the second-stage receiving wall 5 are flush with each other, and the left-right direction is provided between the first-stage support wall 4 and the second-stage bottom plate 2. A spacer block 35 extending in the vertical direction and a spacer block 36 extending in the front-rear direction are interposed.

The front surfaces 10 of the second and third receiving walls 5 are flush with each other, and extend in the left-right direction between the second supporting wall 4 and the third bottom plate 2. A spacer block 35 and an L-shaped spacer block 37 are interposed. The bent lower end of the L-shaped spacer block 37 is in contact with the upper surface of the second-stage receiving wall 5 to support the weight of the front half of the third-stage fish nest block 1.

The present embodiment has the following operations and effects in addition to the operations and effects (1) to (6) similar to those of the first embodiment. (12) The spacer blocks 35 to 37 allow the height of the revetment to be adjusted. (13) The gap formed between the spacer blocks 35 to 37 and between the upper and lower fish nest blocks 1 serves as an evacuation site for fish and the like.

Next, the seawall with a fish nest of the sixth embodiment shown in FIG. 16 will be described. In this embodiment, some of the fish nest blocks 1 are spaced apart from each other and the stair blocks 47 are provided between the rows. Only the accumulated points are different from the first embodiment. The left-right length of this staircase block 47 is 1
000mm, width in the front-back direction is 1500mm, height is 10
It is 00 mm. Three step portions 48 are formed on the front surface of the staircase block 47, and the gradient thereof is 10%. Further, a hollow portion 49 having a circular cross section is provided between both side surfaces. These staircase blocks 47 are piled up while appropriately shifting their relative positions according to the gradient of the fish nest block 1.

The present embodiment has the following operations and effects in addition to the operations and effects (1) to (6) similar to those of the first embodiment. (14) Since the water flow in the fish nest can be mitigated by the stair block 47, the juveniles can be protected from the water flow and the spawning activity of the adult fish becomes easy. (15) Since the staircase block 47 of this embodiment has a width in the front-rear direction smaller than that of the fish nest block 1, an escape path 50 is formed between the blocks 47 and 1, and fish or the like can escape through the escape path 50 when the water level decreases. it can.

(16) The hollow portion 49 prevents the staircase block 47 from interfering with the fishway function of the fish nest block 1, and
It forms a dark area that is comfortable to live in for fish and the like. (17) By installing the staircase block 47, it becomes possible to walk the waterway more easily and safely, so that it is possible to prevent water accidents such as slippage at the revetment. In addition, on the upper surface of the stair block 47 and the step portion 48,
It is preferable to provide irregularities such as a lattice pattern or a rock surface pattern to prevent slippage and improve the scenery.

Next, the revetment with a fish nest according to the seventh embodiment shown in FIG. 17 will be described. In this embodiment, different staircase blocks 51 are used, and the fish nest blocks 1 between the first stage and the third stage are separated. The sixth embodiment is different from the sixth embodiment only in that the box-shaped blocks 54 are stacked on each other. The width of the staircase block 51 in the front-rear direction is 2000 mm, four stepped portions 52 with undercuts are formed on the front surface, and a large hollow portion 53 having a trapezoidal cross section is provided between both side surfaces. The length of the box-shaped block 54 in the left-right direction is 1980 mm, the width in the front-rear direction is 2000 mm, and the height is 1000 mm, and a large hollow portion 55 having a substantially rectangular cross section is provided between both side surfaces. ..

The present embodiment has the following actions and effects in addition to the actions and effects substantially similar to those of the sixth embodiment. (18) By using the box-shaped block 54, a large dark area that is comfortable for the fish to live in is formed in the fish nest.

The present invention is not limited to the configuration of the above-described embodiment, but may be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows. (1) Support wall 4 of the first embodiment and support wall 24 of the second embodiment
Provide both and. (2) Dividing and forming a fish nest block into two or more members, and using them by combining or assembling them. (3) As shown by the chain line in FIG. 8, a scaffold 33 extending forward is provided at the front end of the bottom plate 22 and used as a scaffold for walking in a waterway.

[0067]

Since the seawall with a fish nest according to claim 1 or 2 of the present invention is configured as described above, it is possible to easily construct a strong seawall adapted to waterways having different slopes. It can be used as a safe stairway when walking in a waterway, and it has an excellent effect that it can form a fish nest close to nature suitable for aquatic organisms such as fish, shellfish and crabs over a wide area. Play.

In addition to the above effects, according to the seawall with a fish nest according to the third aspect, it is possible to reliably prevent the shift of the fish nest blocks in the upper and lower stages.

According to the seawall with a fish nest according to the fourth or fifth aspect, the roadway or the sidewalk can be widened to facilitate passage of a large automobile or people.

According to the seawall with a fish nest according to the sixth or seventh aspect, a fish nest suitable for activities such as fish, which is rich in variation, is formed.

According to the seawall with a fish nest according to the eighth aspect, the height of the seawall can be adjusted and an evacuation site for fish and the like can be formed.

According to the seawall with a fish nest according to the ninth aspect, the juveniles can be protected from the water stream, the spawning activity of the adult fish can be facilitated, and water accidents such as sliding down on the seawall can be prevented.

Further, according to the revetment with a fish nest according to the tenth aspect, it is possible to prevent the stair block from interfering with the fishway function of the fish nest block, and to form a dark part which is comfortable for the fish and the like to live in.

[Brief description of drawings]

FIG. 1 is a perspective view of a fish nest block used in a first embodiment of the present invention.

FIG. 2 is a perspective view of a seawall of the first embodiment constructed by the fish nest block.

FIG. 3 is a perspective view of a modification of the first embodiment constructed by another stacking method.

FIG. 4 is a sectional view of a modification of the first embodiment in which the relative position of the fish nest block is changed.

FIG. 5 is a sectional view of another modification of the first embodiment in which the relative positions of the fish nest blocks are changed.

FIG. 6 is a cross-sectional view of a modification of the first embodiment in which the sidewalk is displaced and formed.

FIG. 7 is a perspective view of a fish nest block used in the second embodiment of the present invention.

FIG. 8 is a cross-sectional view of a seawall of the second embodiment constructed by the fish nest block.

FIG. 9 is a sectional view of a modification of the second embodiment in which the relative position of the fish nest block is changed.

FIG. 10 is a cross-sectional view of another modification of the second embodiment in which the relative position of the fish nest block is changed.

FIG. 11 is a cross-sectional view of a modification of the second embodiment in which the roadway is expanded and formed.

FIG. 12 is a plan view of a seawall according to a third embodiment of the present invention.

FIG. 13 is a perspective view of the seawall.

FIG. 14 is a perspective view of a seawall according to a fourth embodiment of the present invention.

FIG. 15 is a perspective view of a revetment according to a fifth embodiment of the present invention.

FIG. 16 is a perspective view of a seawall according to a sixth embodiment of the present invention.

FIG. 17 is a perspective view of a seawall according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 fish nest block 2 bottom plate 3 vertical wall 4 support wall 5 receiving wall 15 slope 21 fish nest block 22 bottom plate 23 vertical wall 24 supporting wall 25 receiving wall 32 lid 34 fish nest block 35 spacer block 36 spacer block 37 spacer Block 47 Stair block 49 Hollow part 51 Stair block 55 Hollow part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuro Toyoda 10 Myotokucho, Gifu City, Gifu Prefecture Showa Concrete Industry Co., Ltd. (72) Inventor Toshiro Fujio 10th Myotoku Town, Gifu City, Gifu Prefecture Showa Concrete Industry Incorporated (72) Inventor Toshio Yokoyama 10 Myotokucho, Gifu City, Gifu Prefecture, Showa Concrete Industry Co., Ltd. (72) Inventor Hiroshi Ono, 10 Myonokucho, Gifu City, Gifu Prefecture, Showa Concrete Industry Co., Ltd. ( 72) Inventor Masaaki Iwasaki 10 Myotokucho, Gifu City, Gifu Prefecture, Showa Concrete Industry Co., Ltd. (72) Inventor Katsuhide Hosoe, 10th Meitokucho, Gifu City, Gifu Prefecture Showa Concrete Industry Co., Ltd. Sadakazu Ito 10 Meitokucho, Gifu City, Gifu Prefecture, Showa Concrete Industry Co., Ltd. (72) Inventor, Mitsuru Ichihashi Gifu Prefecture Showa Concrete Industry Co., Ltd. 10 Myotokucho, Gifu City

Claims (10)

[Claims] 1. A bottom plate, a vertical wall extending in the left-right direction which is erected on a rear edge of the bottom plate, a receiving wall extending in the left-right direction which is erected on a front edge of the bottom plate, and the vertical wall. Use a fish nest block equipped with a support wall protruding forward from the upper end of the fish nest block, and line up the fish nest blocks on the slope of the waterway so that the rear surface of the vertical wall faces the slope. The fish nest block of the lower stage is formed by arranging the following fish nest blocks on the upper surfaces of the vertical wall and the supporting wall of the lower fish nest block so that the rear surface of the vertical wall faces the slope, forming the upper stage, and the fish nest of the lower stage. A seawall with a fish nest constructed by arranging the upper surface of the receiving wall of the block and the upper surface of the receiving wall of the fish nest block in the upper stage in a staircase pattern. 2. A bottom plate, a vertical wall extending in the left-right direction which is erected on a rear edge of the bottom plate, a receiving wall extending in the left-right direction which is erected on a front edge of the bottom plate, and a bottom wall of the bottom plate. A fish nest block provided with a support wall erected in the middle is used, and the fish nest blocks are arranged on the slope of the waterway so that the rear surface of the vertical wall faces the slope to form a lower stage. , The upper wall of the lower fish nest block is formed by arranging the following fish nest blocks on the upper surfaces of the vertical wall and the supporting wall so that the rear surface of the vertical wall faces the slope, forming the upper row, and A seawall with a fish nest constructed by arranging the upper surface of the receiving wall and the upper surface of the receiving wall of the fish nest block in the upper stage in a staircase pattern. 3. The seawall with a fish nest according to claim 2, wherein a fitting recess into which the upper surface of the vertical wall or the support wall is fitted is provided on the lower surface of the bottom plate of the fish nest block. 4. The roadway or sidewalk is formed by extending or displacing to the upper side of the support wall of the uppermost fish nest block.
The seawall with the listed fish nest. 5. The uppermost fish nest block is formed by covering a lid between at least an upper surface of a vertical wall and an upper surface of a supporting wall and extending or displacing a roadway or a sidewalk above the lid. The seawall with a fish nest according to item 2. 6. The seashore with a fish nest according to claim 1, wherein the relative positions of the upper and lower fish nest blocks in the front-rear direction are changed between the rows. 7. The seawall with a fish nest according to claim 1, wherein the fish nest blocks having different heights are mixedly used. 8. The seawall with a fish nest according to claim 1, wherein a spacer block thinner than the fish nest block is interposed between the fish nest block on the upper stage and the fish nest block on the lower stage. 9. Separating the rows of some of the fish nest blocks,
The seawall with a fish nest according to claim 1, wherein stair blocks are stacked between the rows. 10. The seawall with a fish nest according to claim 9, wherein a hollow portion is provided between both side surfaces of the staircase block.