JP3042382B2 - Seaweed bed development structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seaweed bed construction structure.

[0002]

2. Description of the Related Art Eelgrass is known as a kind of seaweed that grows in the shallow sea of sand. This kind of eel has an important role as a spawning ground for seafood and a place for growing fry. However, recently, the growth of this type of seaweed has been poorly reduced or significantly reduced due to cutting off by a fish net or outflow of sand caused by drifting sand.

[0003] When seaweed is greatly reduced or grows poorly, the growth of fish and shellfish is seriously affected, and urgent recovery is required. Therefore, various kinds of seaweed bed creation means have been proposed so far,
At present, none of them can be said to have sufficiently responded to this request. The present invention has been made in view of such conventional problems and the current situation, and an object of the present invention is to provide a seaweed bed creation structure suitable for the growth of seaweed and the growth of seafood. It is in.

[0004]

Means for Solving the Problems In order to achieve the above object, a seaweed bed-constructed structure according to the present invention is provided with a reinforced concrete or steel frame, and when the frame is held and laid down, A three-dimensional mesh-shaped artificial seaweed that covers the bottom of the sea, wherein the artificial seaweed is seeded with seaweed seeds at the lower end surface.
Sheet-shaped part that covers the bottom of the sea,
And a band-shaped part fixed so as to protrude upward.
Have . According to the seaweed bed construction structure constructed in this way, when the structure is laid on the seabed on which the seeds of the seaweed are sown, a sheet- shaped three-dimensional net-like artificial seaweed is formed on the seabed.
As a result, the influence of waves and tidal currents on the area where the seaweed seeds are sown is reduced, and the outflow of sand from this area is also prevented. Further, in the present case, the frame
Since the band-shaped portion protruding upward from the upper surface of the body is provided, the influence of waves and tidal current can be reduced by this band-shaped portion. When the seaweed grows from the sown seeds, the three-dimensional net-like artificial seaweed has enough voids, so the seaweed penetrates this artificial seaweed,
Can grow. In addition, the seagrass bed construction structure of the present invention includes a reinforced concrete or steel frame,
When it is held by the body and sunk, the bottom surface of the seaweed seeds
A three-dimensional mesh-shaped artificial seaweed covering the bottom of the sea
In addition, an upward flow generating portion was provided on the side of the artificial seaweed . When the upward flow generating section is provided, an upward flow is generated, and the influence of waves and tides on the inside of the three-dimensional mesh-shaped artificial seaweed can be further reduced. As the three-dimensional net-like artificial seaweed, for example, a tanglet (trade name, manufactured by Daiwa Spinning Co., Ltd.), which is a three-dimensional net-like structure made of synthetic resin, can be used. Such a seaweed bed creation structure can be produced in a factory or in a local production yard. In addition, when installed in the sea, depending on the scale of the seaweed bed to be created, the unit units may be settled as a block unit that is connected with a plurality of metal fittings, or the unit units may be settled, Connect above.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5
1 shows a first embodiment of a seaweed bed construction structure according to the present invention. The seaweed bed creation structure 10 shown in FIG. 1 includes a frame 12 and artificial seaweeds 14. The frame body 12 includes a pair of rectangular pillars 16 and 18 arranged in parallel, a rectangular connector 20 that integrally connects the pillars 16 and 18 at the center in the longitudinal axis direction, and a pair of pillars 16. , 18 at both ends in the longitudinal direction.

In this embodiment, a pair of rectangular columnar bodies 16, 1
8 and the square connector 20 are formed of reinforced concrete, and at the lower end of each of the rectangular columnar bodies 16 and 18 facing the inner surface side, an L-shaped notch 1 extending along the longitudinal axis direction is provided.
6a and 18a are formed respectively. Connected body 20
Both ends are fixedly provided between the pair of rectangular columnar bodies 16 and 18 so as to be continuous with the upper ends of the L-shaped cutouts 16a and 18a.

Further, the lower end surfaces of the rectangular columnar bodies 16 and 18, respectively the bottom plate 2 6, 2 8 are integrally fixed to each bottom plate 2 6, 2 8 and the notch portion 16a, at 18a, U-shaped space 3 opened on the inner surface side of opposed columnar bodies 16 and 18
0, 32 are formed. Each connecting plate 22, 24, and both ends are fixed by welding to the base plate 2 6, 2 8.
The artificial seaweed 14 is composed of, for example, a tanglet (trade name: manufactured by Daiwa Spinning Co., Ltd.), which is a three-dimensional network-like structure made of synthetic resin, and has a sheet-shaped portion 14a and a band-shaped portion 1.
4b.

[0008] The sheet-shaped portion 14a has a rectangular columnar body 16,
A length (about 2 m) substantially equal to the length in the longitudinal direction of 18;
The same thickness (50 mm) as the height of the notches 16a and 18a
), And both ends in the width direction are inserted into the U-shaped spaces 30 and 32 so as to penetrate below the connecting body 20. The sheet-shaped portion 14a is fixed to the connecting plates 22 and 24 at both ends in the longitudinal direction by bolts and nuts.

The band-shaped portion 14b has a thickness of about 50 mm and a height of about 600 mm, and is formed on the central axis on the upper surface side of each of the prismatic columns 16 and 18 and the connecting body 2.
0 is fixed on the center axis on the upper surface side. Pillars 16,
The band-shaped portion 14b fixed on the upper surface side of the
The band-shaped portions 14b extending over the entire length along the longitudinal axis directions of the connecting members 20 and 18 and fixed to the upper surface side of the connecting body 20
Extends along the longitudinal direction of the connecting body 20 over the entire length thereof.

[0010] The thus constructed seagrass bed forming structure 10
Can be produced in a factory or in a local production yard. Then, the manufactured structure 10 is laid in advance on the sea floor on which seaweed seeds are sown. When the structure 10 is sunk, the structure 10 is transported to a sunk site by a crane ship or the like, and is laid so that the bottom plates 26 and 28 and the connection plates 22 and 24 are seated on the sea floor.

In this case, the structure 10 can be used as a single unit. For example, the structure 10 can be sunk by a block body in which a plurality of units are connected, or the sunk unit units can be connected on the sea floor. It can also be blocked.
In a state where the structure 10 is laid down on the sea floor on which the seeds of the seaweed are sown, the artificial seaweed 1 having a three-dimensional mesh shape is formed on the sea bottom.
4 is covered with the sheet-shaped portion 14a, so that the influence of waves and tidal currents in this portion can be reduced, sand can be prevented from flowing out, and seaweed can be sufficiently grown at a desired place.

When seaweed grows from the seeds sown,
The sheet-shaped portion 14a of the three-dimensional net-shaped artificial seaweed 14 is
Since there are enough voids, the seaweed is
4 through the sheet-shaped portion 14a. Further, in the case of the present embodiment, the prismatic pillars 16,
18 and the artificial seaweed 1 projecting upward from the upper surface of the connected body 20
Since the four band-shaped portions 14b are provided, the influence of waves and tides can be reduced by the band-shaped portions 14b.

FIGS. 6 to 9 show a second embodiment of the seagrass bed construction structure according to the present invention. The seaweed bed creation structure 10a shown in FIG. 1 is schematically constituted by a frame 12a, an artificial seaweed 14, and a pair of upflow generators 40. Frame 12
a is formed in a substantially square frame shape, and a cross-shaped mounting plate 42 is fixed to the center of the frame 12a.

The artificial seaweed 14 has a three-dimensional network structure similarly to the above embodiment, and is constituted by a sheet-shaped portion 14a. The sheet-shaped portion 14a is
a and the upper surface of the mounting plate 42, and is fixed to the mounting plate 42 by bolts and nuts. A pair of upflow generators 4
In FIG. 6, the reference numeral 0 is arranged in the vertical direction so as to sandwich the sheet-shaped portion 14a of the artificial seaweed 14.

Each of the upflow generators 40 includes a pair of side plates 40a erected at both ends of the frame 12a, and two first and second rectifying plates 40 having both ends fixed between the side plates 40a.
b, 40c, a reflector 40d, and a bottom plate 40e fixed to the lower end of the reflector 40d. Bottom plate 40e
Is fixed to the frame 12a by bolts and nuts together with the end of the mounting plate 42.

On the other hand, a pair of first and second rectifying plates 40
b, 40c and the reflection plate 40d have a length in the width direction of the side plate 40.
The height is set to approximately half of the height of “a”, and the width direction is set to be vertical. The first and second rectifying plates 40b and 40c are fixed at positions where the lower ends are separated above the bottom plate 40e, and an inlet 40f for waves and tides is formed below each rectifying plate 40b and 40c. ing.

The reflection plate 40d is disposed at the center of the side plate 40a so as to face each of the entrances 40f, and the upper side thereof is a wave and tide outlet 40g.
According to the seaweed bed development structure 10a configured as described above,
In addition to the effects of the first embodiment, the artificial seaweed 14
Is provided with a pair of updraft generators 40 on the sides of the algae, so that an updraft is generated, thereby further reducing the influence of waves and tidal currents inside the three-dimensional mesh-shaped artificial seaweed 14. Can be.

That is, in the case of this embodiment, the structure 1
When the waves and tides flow from the inlet 40f of the upward flow generating unit 40 when the waves 0a are sunk on the sea floor, the waves collide with the reflector 40d, so that the flow direction is changed to the upward direction, and the upward flow is caused. A stream is discharged from the outlet 40g. Therefore, the generation of the upward flow changes the waves and the tidal current to the upward flow, so that the influence of the waves and the tidal current on the inner side where the artificial seaweed 14 is provided is reduced.

FIG. 10 shows a seaweed bed construction structure 1 of the second embodiment.
The example of arrangement | positioning at the time of blocking and setting in 0a is shown. In the arrangement example shown in the figure, 24 seaweed bed development structures 10a are used to form a block in a substantially rectangular shape, and the hatched portion in the figure is the artificial seaweed 14, The portion indicated by the dashed line is the upward flow generating section 40.

The seaweed bed construction structure of the present embodiment can be formed into a block having an arbitrary shape by arbitrarily connecting a plurality of the seaweed bed formation structures. Can be easily formed.

[0021]

As described above in detail in the embodiments,
According to the seagrass bed construction structure of the present invention, the following effects can be obtained. A three-dimensional mesh-shaped artificial seaweed can cover the area where the seaweed seeds are sown, eliminating the effects of waves and tidal currents and sand runoff to ensure normal seed growth. it can. Since the artificial seaweed has a three-dimensional network structure and has sufficient voids, even if the seaweed germinates and grows, it can penetrate and grow through the artificial seaweed. Since the structure is relatively lightweight, it is easy to settle and the three-dimensional mesh-shaped artificial seaweed is flexible, so even if there is some undulation in the seabed ground, it can follow the undulation. it can. When the seaweed grows, it can not only serve as a seafood spawning ground and a fry rearing ground, but also useful for purifying seawater. When the upward flow generating section is provided as in claim 2, an upward flow is generated, and the influence of waves and tides on the inside of the three-dimensional mesh-shaped artificial seaweed can be further reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a seaweed bed creation structure according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along lines AA and DD of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

FIG. 6 is a plan view showing a second embodiment of the seaweed bed creation structure according to the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view of FIG. 6;

FIG. 9 is a sectional view taken along line EE of FIG. 6;

FIG. 10 is a plan view showing an arrangement example when the structure shown in FIG. 6 is divided into blocks.

[Explanation of symbols]

 10, 10a Seaweed bed creation structure 12, 12a Frame 14 Artificial seaweed 14a Sheet-shaped portion 14b Band-shaped portion 16, 18, prismatic columnar body 20 Connected body 22, 24 Connecting plate 26, 28 Bottom plate 40 Upflow generator 40a Side plate 40b , 40c Rectifier plate 40d Reflector plate

────────────────────────────────────────────────── (5) References JP-A-59-205921 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01K 61/00 A01G 33/00

Claims (2)

(57) [Claims] 1. A frame made of reinforced concrete or steel, and a three-dimensional mesh-shaped artificial seaweed held on the frame and covering the bottom of the sea when sunk, wherein the artificial seaweed is Sea bottom with seaweed seeds scattered at the end
A sheet-shaped portion covering the top, and projecting upward from an upper surface of the frame.
A seaweed bed creation structure comprising a band-shaped portion fixed so as to come out . 2. A frame made of reinforced concrete or steel.
When it is held by this frame and submerged, the lower end
Three-dimensional mesh-like artificial covering the sea floor with algae seeds
Seaweed, and an upflow generator is provided on the side of the artificial seaweed.
Seaweed bed construction structure .