JPH07113207B2 - Fish nest block - Google Patents

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 which has the functions of revetment and embankment construction and is used for habitat of fish, aquatic insects and the like.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of nature conservation, blocks for rivers, marshes, lakes, coastal revetments and levees have a function of providing a habitat for aquatic organisms such as fish and aquatic insects. Have been proposed.

In general, this fish nest block is provided with a fish nest space for inhabiting aquatic organisms inside the block body, and an entrance opening communicating with the fish nest space is formed in the front wall of the block body. . For example, Japanese Utility Model Laid-Open No. 62-60622 discloses a block in which a fishway opening communicating with the inner fish nest space is formed on the left and right side surfaces and the front surface. Further, Japanese Utility Model Publication No. 4-2196 discloses a block having a hollow rectangular tube shape whose opening upper surface serves as an opening for an entrance of an internal fish nest space.

[0004]

However, among the conventional fish nest blocks described above, except for the technique disclosed in Japanese Utility Model Publication No. 4-2196, the fish nest space is simply surrounded by the inner wall surface of the block. , The inside and its surroundings are structures that cannot grow aquatic or terrestrial plants, so that aquatic organisms that prefer plant communities as a hiding place are actually hard to inhabit.

Even if aquatic organisms inhabit such fish nest blocks, all of the conventional fish nest blocks described above have a large size of the opening and the size of the fish nest space where the aquatic organisms enter and leave. Since the fish nest blocks that are the most suitable for them are occupied by the fish species that are the most suitable for these, the fish nest blocks that have been installed will not be able to become habitats for various aquatic organisms. The system was lacking in maintainability. In particular, the block disclosed in Japanese Utility Model Publication No. 4-2196 is useless because the entrance of the fish nest space is formed on the upper surface of the block body, and thus the deposit accumulates inside the block when the time elapses and the fish nest space is closed. There is a problem of disappearing.

In view of the above-mentioned problems of conventional fish nest blocks, an object of the present invention is to allow plants to be clustered around the fish nest space, etc. The object of the present invention is to provide a fish nest block that is a good habitat for various aquatic creatures of different sizes by arbitrarily changing the opening area of the entrance to the fish nest space.

The present invention is characterized in that the following configuration is provided to achieve the above object. That is, a planting space with an open top is formed in the upper part of the block main body, which is filled with a planting filling material such as rubble. An underside open fish nest space is formed below the planting space below the block body. The space is partitioned by a partition wall, and a partition wall is formed with a through hole that connects the spaces. The upper and lower surfaces of the block body are provided with an engaging portion and an engaged portion that are engaged with each other and can be stacked in a zigzag manner at a predetermined gradient. In the stacked state, aquatic organisms such as fish enter and leave the fish nest space of the block on the wall surface of the block at a position that partially covers the planting space of the lower block, and its size is for the above-mentioned planting of the lower block. An opening that can be changed by the filling material is formed so as to be cut from the lower end of the wall surface.

The shape and size of the opening are arbitrarily set, but the vertical cross section is preferably formed in a substantially trapezoidal shape from the lower end of the wall surface of the block body toward the upper side.

[0009]

When the fish nest blocks of the present invention are stacked, the planting space of the lower block is exposed between the upper blocks so as to project forward. Therefore, if a plant such as pussy willow is planted by filling the planting space with a filler such as gravel, the periphery of the opening formed in the wall surface of the upper block body is covered with these plants. In addition, the roots of the plants vegetated in the planting space are projected from the through hole of the partition wall into the fish nest space below. The roots overhanging the fish nest space provide an environment where small organisms such as shrimps, crabs and aquatic insects can easily settle.
Since small aquatic organisms serve as food for fish, the fish nest space is used as an evacuation and resting place as well as a feeding site. Furthermore, the roots extending to the nest space also serve as a suitable spawning site for fish such as carp and crucian carp.

The upper block is supported by the lower block so that the bottomless fish nest space spans the two left and right planting spaces of the lower block. Therefore, the volume of the fish nest space is appropriately adjusted by adjusting the amount of the filling material filled in the planting space. In addition, since the opening serving as the entrance to the fish nest space is formed at the lower end of the wall surface of the block body, the width of the opening of the upper block is adjusted by adjusting the amount of the filling material accumulated in the planting space of the lower block. Therefore,
Despite being the same block, various fish nest spaces with different opening areas and internal volumes can be formed simply by adjusting the amount of filler and the amount of material added to the planting space during construction. As a result, the aquatic organism selects a fish nest space having an opening area and an internal volume suitable for its length, etc., and becomes a habitat.

[0011]

The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a perspective view of a fish nest block according to an embodiment of the present invention.

In the figure, reference numeral 1 is a block body, which is formed in a shape having an internal space which is horizontally closed. The space inside the block body is divided into a planting space 3 in the upper part and a fish nest space 4 in the lower part through a partition wall 2 in the middle in the vertical direction. A large number of through holes 5 are formed in the partition wall 2. Through hole 5
Is useful for establishing water communication between the planting space 3 and the fish nest space 4, and for invading the roots of plants in the planting space to the fish nest space 4 to form an environment in which aquatic organisms can easily live. .
The shape of the block body 1 does not matter as long as the above-mentioned spaces are formed.

As shown in the cross-sectional view of FIG. 3, the planting space 3 has an inverted trapezoidal cross section with an open upper surface, is filled with a filling material such as rake, and a suitable aqueous plant is planted. . The filling material may be a stone material such as cobblestone and a crushed stone, or a lump of concrete, in addition to rubble. The size of these fillers is appropriately selected according to the type of plant.

As shown in the same sectional view, the fish nest space 4 has a trapezoidal vertical cross section with an open lower surface. This fish nest space 4
Has an opening 6 formed at a predetermined position on the wall surface of the block main body, and aquatic organisms enter and exit through the opening 6. Opening 6
Is formed at a position overlapping the planting space 3 of the lower block when the main blocks are stacked in a staggered manner with a predetermined gradient. In the block of this embodiment, one is provided on each of the left and right sides of the wall surface of the block body (see FIG. 2), and the block body 1 has a trapezoidal shape from the lower end to the upper side of the wall surface.

Reference numeral 7 is an engaging projection formed on the bottom surface of the rear portion of the block body 1 and is continuous in the width direction of the block body 1 as seen in the bottom view of FIG. Further, 8 is a rear projecting portion integrally provided on the rear portion of the block body 1,
Engagement grooves 9 are formed continuously on the upper surface of the block main body 1 in the width direction so as to engage the engagement protrusions 7 and stack the blocks in a zigzag manner at a predetermined gradient. Two engagement grooves 9 are formed in the front-rear direction of the block main body 1, and either one is selectively used according to the gradient of the law.

In the figure, reference numeral 10 is a large through hole formed at an appropriate position of the partition wall 2 and has the same function as the above through hole 5 and fills the planting space when the water level of a river is lowered. Small aquatic organisms left in the gaps between the materials pass through here and escape to the fish nest space 4.

The construction of the fish nest block will be described (see FIGS. 4 to 6). The first-stage blocks B1 are arrayed on a horizontal foundation (not shown). Next, between the blocks B1 on the left and right adjacent to the first stage, the block B on the second stage is
2, the engaging projection 7 is the engaging groove 9 of the block B1 of the first stage.
Place it so that it is locked to.

At this time, the amount of the rake filled in the planting space 3 of the first-stage block B1 occupying the inside of the fish nest space of the second-stage block B2 from below is adjusted as appropriate to the fish nest space 4 of each block. Adjust the volume of. Similarly, the amount by which the opening blocks the opening 6 is also adjusted as appropriate depending on the amount of stacking around the opening. Since the opening 6 has a trapezoidal shape, the width and width can be adjusted relatively easily. As a result, the volume of the fish nest space 4 of each block in the same stage or the size of the opening 6 through which the aquatic organisms enter and exit are different. In the planting space 3, various water-based plants are planted according to the construction site. These plants grow and cover the area around the opening of the upper block.

The blocks B3 and B4 having the number of stages as necessary are sequentially stacked, the amount of rectification filling in the planting space of the blocks of each stage is adjusted, and vegetation is applied to complete the construction.
On the revetment constructed in this way, various aquatic creatures enter the fish nest space of a suitable block according to their length and height, and use this as a home.

[0020]

As described above, according to the present invention, a planting space is provided in the upper part inside the block body, and a fish nest space is provided in the lower part inside the block body. Since the plant vegetated in the surrounding area surrounds the periphery of the opening that communicates with the fish nest space of the upper block, it is possible to provide a habitation house with an environment in which plants favoring aquatic organisms grow.

Further, according to the present invention, the volume of the fish nest space of the upper block and the opening area of the lower end of the wall surface communicating with the space of the upper block can be arbitrarily adjusted by the filling material such as rake filled in the planting space of the lower block. Since it is a single size block, it is possible to construct fish nests suitable for various types of aquatic organisms, making it possible to comfortably inhabit a wide variety of aquatic organisms for many years It can greatly contribute to the maintenance of.

Further, according to the present invention, since the through hole is formed in the partition wall that separates the planting space and the fish nest space, the root of the plant planted in the planting space is located below the through hole. By overhanging the fish nest space, the fish nest space not only functions as a resting place for fish, but also as a foraging place for fish that feed on the small aquatic organisms that inhabit this root, or for certain types of fish. It can also be used as a spawning place for. In this way, the present invention can provide a fish nest block having a wide range of functions suitable for adjusting the overall survival environment of fish.

[Brief description of drawings]

FIG. 1 is a perspective view of a fish nest block according to an embodiment of the present invention.

FIG. 2 is a bottom view of the block shown in FIG.

FIG. 3 is a vertical cross-sectional view of the block shown in FIG.

FIG. 4 is a perspective view showing a stacked state of the blocks shown in FIG.

5 is a front view of FIG.

6 is a sectional view of FIG.

[Explanation of symbols]

 1 block body. 2 Partition wall 3 Planting space 4 Fish nest space 6 Opening 7 Engaging protrusion 9 Engaging groove

Claims (1)

[Claims] 1. A top-opening type planting space filled with a planting filling material such as a rake is formed in the upper part of the block body, and a partition wall is provided below the planting space below the block body. An open bottom type fish nest space is formed, and a through hole that connects the planting space and the fish nest space is provided in the partition wall, and the upper and lower surfaces of the block main body are engaged with each other in a staggered pattern with a predetermined gradient. An engaging part and an engaged part that can be stacked are provided, and in the stacked state, on the wall surface of the block main body at a position that partially covers the planting space of the lower block, fish etc. in the fish nest space of the block The fish nest block is characterized in that it is formed by cutting an opening from the lower end of the wall surface of which the size of the aquatic organisms can move in and out and the size of which can be changed by the planting filler of the lower block.