JP2001275507A - Concrete block for making seaweed bed and method for using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete block for making a seaweed bed, capable of cultivating marine algae even in a withered seashore area or a sandy ground sea area, decreasing the eating pressure of a sea urchin and artificially cultivat ing and settling marine algae, considering a seaweed bed and fishes and being installed as a coated block for consolidation of foundation for a sand deposit and to provide a method for using the concrete block. SOLUTION: This concrete block for making a seaweed bed is obtained by providing a bottom plate 1 of an approximately quadrilateral reinforced concrete having a proper thickness with a reinforced concrete T-shaped body 7 having a proper thickness, width, height and approximately the same length as that of the bottom plate 1 and forming seaweed bed plates 3 on upper plates 2 of a structure of a row or of plural integrated rows and is set on the bottom of the sea in such a way that the length direction of the T-shaped body 7 is adjusted to the advance direction of waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block for seaweed bed formation mainly in a shallow sea area in a rocky shore and a shallow sea area in a sandy ground, that is, a shore area in a breaking wave zone, and a method of using the same.

[0002]

2. Description of the Related Art In the past, it has been common practice to discard new stones in the shore-burned area and create a so-called shore reef, in which the surrounding area is surrounded by wave-dissipating blocks. It has become a problem and the development of new technologies is desired.

[0003] Even in the rocky rocky reef area, 2M from the shore water surface
In the abandoned stone reef, the sea urchin feeding pressure is small and the seaweed grows due to the high velocity of the waves, and the seaweed grows. .
Seaweed grows even at 0M. Then, on the sea floor 6M below the water surface off the coast, the flow velocity of the ocean current is small, the feeding pressure of sea urchin is large, and the result is that the sea is scorched. From this, it is reported that the area where sea erosion is avoided is caused by a decrease in the feeding pressure of sea urchins due to the flow velocity, and the flow velocity at which the eating pressure is reduced is reported to be about 40 cm / s or more. .

Accordingly, it has been found that the flow velocity is higher near the sea surface than in the sea floor even in an area 3 to 6 M from the water surface, and if an algal reef plate can be installed near the sea surface with a flow velocity of 40 cm / s or more. In addition, it can be expected that sea urchin grows by reducing the feeding pressure of sea urchins.

[0005] The above-mentioned water depth is an area entering the breaking wave zone, and the stability of the structure due to the wave force is a major problem. Therefore,
It is necessary to have a wave transmission type structure that does not oppose the wave force and does not receive the wave resistance as much as possible.

Further, there is no good method for creating a seaweed bed in a shallow sea area of a sandy ground, that is, in a breaking wave zone, and there is a drawback that even if a reef is formed, it is buried in sand.

Therefore, it is desired to create a rocky reef root mainly in a seaweed bed in the shallow sea area of the sandy ground. However, because of the wave breaking zone, the influence of waves is great, and in addition to the stability of the installed structure, At present, scouring and burial of the sandy ground is a major problem and there is no good measure.

Therefore, there is a need for a seaweed bed type reef type that is not affected by waves and is of a wave transmitting type and that is not scoured or buried.

[0009]

DISCLOSURE OF THE INVENTION The present invention is to cultivate seaweed even in a sandy area where there is no seaweed in the vicinity or in a sandy shallow sea area, thereby reducing the feeding pressure of sea urchins and artificially cultivating seaweed. And, on the other hand, set up a sea urchin hideaway,
A concrete block for creating a seaweed bed and a method of using the same, which can be installed as a block for covering the roots of a sandy ground while considering seaweed beds and fish.

[0010]

According to the present invention, a T-shaped body of reinforced concrete having an appropriate thickness, width and height is formed on a substantially square reinforced concrete bottom plate having an appropriate thickness. An algae reef board is formed on the upper plate of the structure integrated with a plurality of rows, and a concrete block for seaweed bed creation is set in the bottom so that the length direction of the T-shaped body matches the traveling direction of the waves. The bottom surface of the upper plate of the T-shaped body is provided with a slope that rises from the inside to the outside, and a plurality of holes, such as sea urchins, are provided on the vertical wall of the T-shaped body.

Furthermore, the concrete block for forming a seaweed bed is installed adjacent to the shallow sea area of the sandy ground so as to cover the seabed of the sandy ground. Seaweed bed construction concrete that is laid as a solidification covering block for reefs, jetties, gentle slopes, breakwaters, etc., and is also installed so that the algal plate is positioned at a velocity of about 40 cm / s or more. Consists of how to use the block.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a concrete block for seaweed bed creation and a method of using the same according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view of FIG. 1, FIG. 2 is a plan view in the AA direction, and FIG. 3 is a side view in the BB direction of FIG. 1. FIG. Fig. 3 shows a concrete block for site preparation, on a square or rectangular reinforced concrete bottom plate 1 having an appropriate thickness, having an appropriate thickness, width and height, and having substantially the same length as the above-described bottom plate 1 This is a structure in which T-shaped plates 2 made of reinforced concrete are integrated in two rows.

The above-mentioned T-shaped body 7 is formed in two rows in parallel, this concrete block structure is installed on the sea floor, and the bottom of the T-shaped body 7 is set in accordance with the direction of wave propagation. When the concrete block structure is settled in the shore-burning zone, the algal reef board 3 is detachably provided on each upper surface of the T-shaped body 7, and is located at a position of about 1.0M from the water surface where seaweeds may grow. By setting the structure as described above, a seaweed bed can be formed in a water depth area equivalent to the height of the structure.

A rope with seeds of seaweed to be cultivated at the time of installation can be wrapped around the algae reef board 3 so as to germinate and settle artificially. If it is installed in accordance with, the area hit by the waves is reduced, the waves pass through the structure, and are less affected by waves. In addition, the bottom surface of the upper plate 2 of the T-shaped body 7 is inclined so as to rise from the inside to the outside, so that the lifting pressure due to the waves is reduced, the waves are guided outside, and the space between the adjacent T-shaped body is formed. This makes it easier to escape above the gap.

Further, as shown in the figure, if a hole 4 of an appropriate size is provided in the vertical wall 5 of the T-shaped body 7, the hole 4 becomes a shadow of the flow and becomes a hideout for sea urchins and the like.

Furthermore, as shown in FIG. 1, the bottom of the upper plate 2 of the T-shaped body 7 is provided with a slope that rises from the inside to the outside, so that the lifting pressure due to the waves is reduced and the upward flow of the waves is released to the outside. Can be pulled up.

When it is desired to increase the weight for the sake of stability due to the strength of the waves, it is possible to increase the thickness of only the bottom plate 1 so as to cope with a low center of gravity.

Further, the structure of the concrete block for forming a seaweed bed is provided adjacent to a shore area in a shallow sandy area.
By installing so as to cover the sandy seabed, it is possible to prevent scouring of the sandy ground and to prevent these structures from being buried in the sandy ground, and to install these structures by submerging, reefs, By laying as a solidification covering block such as a jetty, a gentle slope embankment or a breakwater, scouring of these embankments can be prevented.

Next, FIG. 4 which shows a side view, FIG. 5 which is a plan view thereof, and FIG. 6 which is a side view taken along the line C--C in FIG. This shows another embodiment applied as a block, in which one row of the T-shaped body 7 is integrated with the bottom plate 1, and in particular, the thickness of the bottom plate 1 is increased and the height is reduced. This is an example in which the stability is increased by lowering it, and it is used as a submerged embankment or a cover block for creating a reef-type seaweed bed. In this case, the length of the upper part of the T-shaped body 7 is smaller than the length of the bottom plate 1.

By arranging and using these covering blocks adjacent to the waste stone mound, a reef space is formed,
A seaweed bed can be formed on the top algal plate 3.

As described above, even in the rocky area, the shallow seabed of about 1.0M from the water surface has a wave velocity of about 40 m.
Focusing on the fact that seaweeds are growing because the feeding pressure by sea urchins is small as large as cm / s or more, the top of the concrete block structure of the present invention where the algal reef plate 3 is provided is located high away from the seabed. In position.

Therefore, the flow velocity of the algal plate 3 at the top is about 40 cm.
/ S or more can be expected to grow seaweed on the algal plate 3.

Therefore, the position where the concrete block of the present invention is installed is, for example, 3M from the water surface to the sea floor.
To 10M shallow water area, which is the area most affected by the wave pressure including the breaking wave zone. The concrete block of the present invention has a T-shaped structure 7 integrated on a wide bottom plate 1, It is installed in the direction of travel, so that its small cross-sectional area is small, so that the resistance of the waves is small and the waves pass through.

[0025]

According to the concrete block for seaweed bed creation of the present invention, since the top of the seaweed reef plate is located near the water surface away from the seabed, the flow velocity by the waves is large, and the feeding pressure by sea urchins is high. As seaweed grows, seaweed grows, and seaweed beds can be formed in the sea area by installing it on the coast of the sea.

Further, the concrete block of the present invention has a structure in which the wave resistance is small, and the bottom surface of the T-shaped upper plate of the block is inclined upward from inside to outside to reduce the lifting pressure due to the wave. In addition to this, there is an effect that the upward flow of the waves is released to the outside and pulled upward.

When it is desired to increase the degree of safety in terms of stability, overturning and sliding, the thickness of the bottom plate alone can be increased to facilitate handling.

On the other hand, the coastal area in the shallow sea area of the sandy ground is a breaking wave zone. When stones or blocks are put on the seabed, the surrounding sand is washed away, scoured, and buried. Next to the seaweed bed development concrete block,
By laying so as to cover the sandy ground, the seabed of the sandy ground is cut off, and the flow of sand and the burial of blocks can be prevented.

[0029] Also, in the shore-burned area and sandy shallow sea area,
Although there are many cases where seaweeds do not exist, in the concrete block of the present invention, an algal reef board is provided at the top,
Furthermore, if a rope with seeds is wrapped around the algae reef board, the target seaweed can be settled at an early stage, and by making an appropriate hole in the vertical wall of the T-shaped body, the shade of the flow can be created. It can provide a retreat for living things such as sea urchins.

On the other hand, the breaking wave zone has poor workability at the time of installation.
Although it is necessary to carry out in a short time, aiming for a good time, using the method of the present invention, it is possible to manufacture a block of a considerably wide bottom plate, use a large hoist ship, and when sea conditions are good,
Can be installed in a short time.

Furthermore, when the method of the present invention is applied to the bedrock coating, the bottom plate is made thicker, the height is made lower to increase the stability, and the baseplate is used as a covering block such as a submerged embankment or a leaf. A fish reef space is formed, which is useful for forming seaweed beds.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a seaweed bed creation concrete block according to the present invention.

FIG. 2 is a plan view in the AA direction of FIG. 1;

FIG. 3 is a side view in the BB direction of FIG. 1;

FIG. 4 is a side view of another embodiment of the concrete block for seaweed bed creation of the present invention.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a side view taken along the line CC in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom board 2 Top board 3 Algae reef board 4 Hole 5 Vertical wall 7 T-shaped

Claims (6)

[Claims] 1. A structure in which a T-shaped body of reinforced concrete having an appropriate thickness, width and height is integrated in one or more rows on a substantially square reinforced concrete bottom plate having an appropriate thickness. A concrete block for seaweed bed formation in which an algal plate is formed on the upper plate and the bottom is set so that the length direction of the T-shaped body is aligned with the traveling direction of the waves. 2. The concrete block for seaweed bed creation according to claim 1, wherein a slope rising from inside to outside is provided on the bottom surface of the upper plate of the T-shaped body. 3. The concrete block for creating seaweed beds according to claim 1, wherein a plurality of holes having a size to be a hideout for sea urchins or the like are provided on a vertical wall of the T-shaped body. 4. A concrete block for seaweed bed formation, wherein the concrete block for seaweed bed formation according to claim 1, 2 or 3 is installed so as to cover the seabed of the sandy ground so as to be adjacent to the coastal area of the shallow seabed. how to use. 5. A concrete block for seaweed bed creation, wherein the concrete block for seaweed bed creation according to claim 1, 2 or 3 is laid as a solidification covering block such as a submerged leve, a reef, a jetty, a gentle slope levee, or a breakwater. how to use. 6. The seaweed bed forming concrete block according to claim 1, 2 or 3, wherein the algal plate has a flow velocity of about 40 cm /
How to use a seaweed bed construction concrete block that is installed so as to be located in a place that is at least s.