JP2756939B2 - Ecosystem-improved revetment structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention is constructed on the shores of various waterways such as rivers and agricultural waterways, and provides a favorable environment for the propagation and growth of small animals such as fish and aquatic insects and plants such as aquatic plants. Revetment structures that maintain and improve underwater and shore ecosystems.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Publication No. 7-62335, it has been a conventional practice to provide a space for accommodating ecosystem retaining members in a revetment structure in order to promote breeding of aquatic creatures and aquatic plants. Have been done. In this revetment structure, an L-shaped main body block composed of a retaining wall portion and a bottom plate portion is installed on the left and right of the channel floor portion, and a vertical partitioning member is protruded parallel to the retaining wall portion on the upper surface of the tip portion of the bottom plate portion. The ecosystem-holding member is accommodated in a space surrounded by the partitioning vertical member, the retaining wall, and the bottom plate and having an upper surface open to a waterway. In addition, ecological holding members are also accommodated in the hollow space provided in the channel floor.

However, in this revetment structure, the space for accommodating the ecosystem retaining member is provided in the waterway, so that the cross-sectional area of the waterway in the waterway becomes smaller and the water level increases when the amount of water increases due to heavy rainfall or the like. Rises rapidly and is dangerous. Further, since the space for accommodating the ecosystem holding member is arranged at the bottom of the channel, the area of the channel floor is reduced, and the total amount of the ecosystem holding member that can be accommodated in the channel floor is suppressed.

[0004] Furthermore, since the main body block has a structure in which a bottom plate is protruded on one side below the retaining wall, the self-sustainability of the main body block is high when the height of the retaining wall is higher than the width of the bottom plate. In addition, since only the retaining wall is in contact with the shore, the seawall is weak and the seawall structure is weak.

[0005]

Accordingly, an object of the present invention is to provide an environment suitable for the propagation and growth of small aquatic creatures such as fish and aquatic insects, and the establishment and prosperity of plants such as aquatic plants, The purpose of the present invention is to provide an ecosystem-improved revetment structure that is sufficiently robust against the earth pressure from the shore side, while ensuring the maximum cross-sectional area of water passage.

[0006]

An ecosystem-improved revetment structure according to the present invention includes an upright wall plate-shaped retaining wall 1 having openings 1a and 1b penetrating in the left-right direction, and a lower portion of the retaining wall 1. And a bottom plate 2 connected to the left and right sides so as to protrude horizontally. The bottom plate 2 has a height corresponding to the height of the shore 5 of the water channel 3 and is provided on the shore side of the retaining wall 1 for receiving a lid. A main body block 4 having an inverted T-shaped vertical cross section provided with a convex portion 1c; a shore-side extension of the bottom plate portion 2 of the main body block 4 while leaving a fixed interval between the retaining wall portion 1 and the vertical wall portion 7 of the main body block 4. Part 2b has a horizontal wall 6
And a fish nest block 9 having an L-shaped vertical section provided with a slit 7 a penetrating in the left-right direction in the vertical wall portion 7; an upper end portion of the vertical wall portion 7 of the fish nest block 9 and a lid receiver of the main body block 4. And a plate-shaped lid block 10 placed on the projection 1c.

A fish nest space 8 surrounded by the retaining wall 1 of the main body block 4, the fish nest block 9 and the lid block 10.
, The ecological holding member 16 is accommodated, and the fish nest space 8
Communicates with the water channel 3 through the opening 1b of the retaining wall 1, and communicates with the soil at the shore 5 through the slit 7a of the vertical wall 7. The ecosystem holding member 16 is also accommodated in the hollow space 12 surrounded by the partitioning blocks 11, 11 arranged at regular intervals on the waterway floor portion 15 and the waterway-side projecting portions 2a, 2a of the bottom plate portion 2 of the main body block 4. You. The ecosystem holding member refers to sand, gravel, gravel, chestnut stone, crushed stone, and the like.

When the earth and sand contained in the water flow flowing through the water channel 3 pass through the hollow space 12 and the fish nest space 8, they come into contact with or collide with the surface of the ecosystem holding member 16 acting as a flow overflow resistance element, thereby causing fish. The water drops into the gaps between the ecological holding members 16 and 16 in the nest space 8 and the depression space 12, and sediment gradually accumulates in the fish nest space and the depression space 12.

[0009] These sediments are used for ecosystem maintenance members 1
6 together with a soil layer suitable for vegetation, in which aquatic plants and algae plants settle and prosper. When aquatic plants thrive to a certain extent, the space within the aquatic plant community provides an optimal environment for small animals such as fry, juveniles or aquatic insects to escape. At the stage where the sedimentation is insufficient, the large and small gaps left between the ecosystem retaining members 16 function as a space for fry and small animals to escape.

[0010] The fish retreat from external enemies in the fish nest space 8, and also perform breeding behavior such as spawning. The groundwater in the stratum of the shore portion 5 in contact with the seawall structure penetrates into the slit 7a of the vertical wall portion 7 of the fish nest block 9 while being filtered by the middle soil layer, and stays in the fish nest space 8 from the slit 7a. Added to water. The groundwater is also added to the flowing water in the water channel 3 through the opening 1a provided at the upper part of the retaining wall 1 of the main body block body 4.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a foundation concrete layer 17 is provided on a channel floor portion 15 by casting in place, and left and right main blocks 4, 4 are installed on the foundation concrete layer 17. . A small opening 1a is provided in the upper part of the retaining wall 1 of the main body block 4, and a large opening 1b is provided in the lower part. These openings 1a and 1b are provided.
The stone-patterned pattern 13 is applied to the entire surface except for the harmony with the surrounding scenery. A sealing material for preventing water leakage is inserted into the joint surface of each component block. A suction prevention member 14 is provided on the soil side of the slit 7a provided in the vertical wall portion 7 of the fish nest block 9.

Since the ecosystem retaining member 16 such as gravel, gravel, rubble, and crushed stone has a purifying action by natural filtration, the ecosystem retaining member 16 is also provided on the upper surface of the channel-side projecting portion 2 a of the bottom plate 2 of the main body block 4. The member 16 is mounted.

[0013]

As described above, according to the present invention, since the ecosystem holding member 16 is accommodated in the fish nest space 8 and the recessed space 12 in the channel floor, the space between the ecosystem holding members 16 is provided. As a result, the escape space indicated by the sum of the above can be secured widely, and the fry or aquatic insects chased by the external enemy can immediately hide themselves, so that the consumption rate of the fry due to predation can be reduced.

Since the ecosystem holding member 16 accommodated in the fish nest space 8 and the depression space 12 promotes uptake and sedimentation of sediment in the water flow, the soil layer necessary for the growth of plants such as aquatic plants is quickly formed. The aquatic vegetation, which is formed sufficiently thick and is useful as an escape space for fry and aquatic insects, will be established and flourish at an early stage. And an environment suitable for the breeding and growth of fish and small animals can be reliably obtained, which is effective for maintaining and improving the underwater and shore ecosystems.

Further, the main body block 4 has a vertical section T in which a bottom plate portion 2 is horizontally extended on both left and right sides of a lower portion of the retaining wall portion 1.
Because of the letter-shaped shape, the self-sustainability is improved as compared with the conventional main body block.
Since b is installed so as to penetrate into the ground at the shore, a stable seawall structure resistant to earth pressure from the shore 5 can be obtained.

Unlike the conventional seawall structure, the fish nest space 8 is arranged in the soil of the shore portion 5 and does not protrude to the waterway 3 side, so that the water passage area of the waterway 3 increases, Since the hollow space 12 of the waterway floor 15 is widened and the ecosystem holding member 16 serving also as purification of running water can be installed in a larger amount, the ecosystem improvement function can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main block main body used for an ecosystem-improved revetment structure according to an embodiment of the present invention, as viewed from a water channel side.

FIG. 2 is a perspective view of a main body block of FIG. 1 and a fish nest block and a lid block used in assembling with the main body block as viewed from a shore side.

FIG. 3 is a plan view showing a laid state of the ecosystem improvement type revetment structure.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retaining wall part of main body block 2 Bottom plate part of main body block 3 Waterway 4 Main body block 5 Shore part 6 Horizontal wall part of fish nest block 7 Vertical wall part of fish nest block 8 Space for fish nest 9 Fish nest block 10 Lid block 11 Partition Block 12 Depressed space 13 Stoned pattern 14 Suction prevention material 15 Waterway floor 16 Ecosystem preservation member 17 Foundation concrete layer

Claims (1)

(57) [Claims] 1. An upright wall plate-like retaining wall 1 having openings 1a and 1b penetrating in the left-right direction, and a bottom plate connected to a lower portion of the retaining wall 1 so as to project horizontally on both left and right sides. 2 and has a height corresponding to the height of the shore 5 of the waterway 3,
A main block 4 having an inverted T-shape in longitudinal section provided with a lid receiving projection 1c on the side surface of the retaining wall 1 on the shore side; leaving a certain interval between the retaining wall 1 and the vertical wall 7 of the main block 4. A horizontal wall portion 6 is mounted on the shore-side overhanging portion 2b of the bottom plate portion 2 of the main body block 4, and an L-shaped fish nest block 9 having a vertical wall portion 7 provided with a slit 7a penetrating in the left-right direction. A plate-like lid block 10 placed on the upper end of the vertical wall 7 of the fish nest block 9 and the lid receiving projection 1c of the main body block 4;
It is surrounded by the retaining wall 1 of the main body block 4, the fish nest block 9 and the lid block 10, communicates with the water channel 3 through the opening 1 b of the retaining wall 1, and the shore 5 through the slit 7 a of the vertical wall 7. Fish nest space 8 communicating with the soil of the river;
5, partition blocks 11 arranged at regular intervals; partition blocks 11, 11 and bottom plate 2 of main body block 4.
An ecosystem-improved revetment structure comprising: a hollow space 12 surrounded by waterway-side projecting portions 2a, 2a; and an ecosystem retaining member 16 housed in the hollow space 12 and the fish nest space 8.