JPH04187035A - Peeling and cleaning bottom of sea and device therefor - Google Patents

Abstract

PURPOSE:To readily form the bottom of the sea capable of culturing sea tangle, etc., with slight influence on other organisms by jetting a liquid toward the bottom of the sea, releasing marine algae from the bottom of the sea by the jet flow, collecting rising marine algae and storing. CONSTITUTION:A liquid is jetted toward the bottom of the sea, marine algae at the bottom of the sea are released by the jet flow, the marine algae released and raised by the jet flow are collected and stored to clean the bottom of the sea. A material to be towed by a boat and movable along the bottom of the sea is preferably provided with a nozzle capable of jetting the liquid toward the bottom of the sea.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a seabed scraping method and a seabed scraping device used in coastal kelp sea areas and the like.

[Prior Art] In general, in coastal kelp sea areas, seaweeds such as miscellaneous seaweeds and limestone tend to grow on the seabed after kelp is harvested.
When these seaweeds proliferate and become more powerful, it becomes difficult for kelp spores to settle on rocky reefs on the ocean floor, making it impossible to harvest kelp in the future.

For this reason, in the past, for example, when seaweed became more active, large amounts of stones were thrown in to form a stone reef that covered the ocean floor where seaweed had grown, making it easier for kelp spores to settle. , we are taking measures to ensure the reproduction of kelp.

Additionally, in the past, when seaweed became more active, the ocean floor was blasted to expose new reefs on the ocean floor, making it easier for kelp spores to settle. There is.

[Problems to be Solved by the Invention] By the way, in the former method of throwing stones mentioned above, since the seabed surface where seaweed has grown is covered, the amount of new stones used increases, which increases the cost. In addition to this, seaweed grows again several years (3 to 4 years) after stones are thrown, so if stones were thrown each time, the cost would become even more enormous. There was a problem. As a result, the production cost of kelp per unit area has become high, resulting in poor productivity.

In addition, the latter method, which uses explosions, has a small processing area per unit time, resulting in poor efficiency, and because it uses explosions, it has the problem of killing or injuring other organisms such as fish and shellfish. there were.

Therefore, an object of the present invention is to minimize the impact on other living things and to easily create a seabed surface on which kelp can settle.

[Means for Solving the Problems] The technical means of the present invention for solving such problems is to inject fil liquid toward the seabed, use this jet flow to peel off seaweed on the seabed, and This method involves scavenging the ocean floor to capture and collect seaweed that has surfaced.

(2) a towing body that is towed by a ship and movable along the seabed;
The submarine scavenging device includes a nozzle that is provided on the towing body and that injects liquid toward the ocean floor.

(3) As a seabed scraping device, the towing body is formed into a flat plate shape, and a rope attachment part to which a towing rope is attached is formed at one end of the towing body, and a rope attachment part to which a towing rope is attached is formed at the other end of the towing body. It is effective to use a plurality of rows of the above nozzles.

[Function] (1) According to the method for scraping the seabed according to the invention of item 1, when seaweed on the seabed is peeled off by the jet flow, a new seabed surface is exposed and the seaweed is peeled off and floats to the surface. Since the seaweed that has been removed is captured and collected, the deposition of seaweed on the newly exposed sea floor is suppressed.

(2) According to the seabed scraping device according to the invention of item 2, when the towed body moves along the seabed and liquid is jetted from the nozzle toward the seabed, this jet stream causes the seabed to Seaweed is peeled off.

(3) According to the submarine scavenging device according to the invention of item 3, since the towing body is formed in a flat plate shape, the plate surface moves while coming into contact with the reef, thereby preventing the situation of being caught on the reef. Deterred. Furthermore, since a plurality of nozzles are provided in rows, the seabed surface can be ablated over a wider range.

[Example] Hereinafter, a seabed scraping method and a seabed scraping apparatus according to an example of the present invention will be described based on the accompanying drawings. The seabed scraping method according to the embodiment is carried out using the seabed scraping device according to the embodiment, so it will be explained along with the operation of this seabed scraping device.

As shown in FIGS. 1 and 2, the seabed scraping device S according to the embodiment includes a towing body 1 that is towed by a ship F and is movable along the seabed, and a towing body 1 that is installed on this towing body 1 and directed toward the seabed. and a nozzle 10 that injects seawater as a liquid □.

The towing body 1 is formed in the shape of a flat plate and is composed of a frame body 2 made of round steel, and a reinforcing body 3 installed in a lattice shape within the frame body 2, and has an appropriate weight (for example, 2 tons). ) is set. One end of this towing body 1, the tip end 4 side, is triangular and has a pointed tip, forming a rope attachment portion 6 to which a towing rope 5 is attached.

The nozzles 10 are arranged in a plurality of rows toward the rear between a pair of covers 8 provided on the rear end 7 side, which is the other end of the towing body 1 . Each nozzle 10 is pivotably supported by the cover 8 and is connected to a swing mechanism 1) that swings them simultaneously. As shown in FIG. 3, the swing mechanism 1) includes a connecting shaft 12 on which each nozzle 10 is supported and connects them to each other, a fluid motor 13 attached to the cover 8 and rotated by pressurized seawater, and a fluid motor 13. and a crankshaft portion 14 that converts the rotation of the connecting shaft 12 into linear motion of the connecting shaft 12. Further, the cover 8 covers the row of nozzles 10 from both sides so that the discharge ports of the nozzles 10 do not protrude outward, and the discharge ports of the nozzles 10 face the rear end gap 15 between the covers 8. Furthermore, each nozzle 10 is connected to a high-pressure hose 16 through which high-pressure seawater is pumped.

The seabed scraping device S according to this embodiment is linked to a barge 20 towed by a ship F, as shown in FIGS. 4 and 5. This barge 20 has a port 21 in the center through which the towing rope 5 is passed. The barge 20 includes a winch 22 for winding and unwinding the towing rope 5 passed through the port 21, and a high-pressure pump 23 for pumping high-pressure seawater to each nozzle 10 via a high-pressure hose 16. and a seawater pump 2 that pumps seawater to rotate the fluid motor 13.
4 is installed.

Moreover, FIGS. 4 and 5 show a seabed insertion system for inserting seaweed on the seabed. This system includes a seabed scraping device S according to the embodiment, a barge 20 linked thereto,
It is composed of a boat F such as a fishing boat that pulls this barge 20, two boats Fa that sail behind the barge 20, and a net 25 stretched across these two boats Fa. There is. This net 25 captures seaweed that is peeled off by the jet stream of seawater jetted from the nozzle 10 and then floats to the surface.

Next, in this submarine penetration system, the submarine scraping device S
The operation and the seabed scraping method according to the example will be explained.

In the submarine penetration system, as shown in FIGS. 4 and 5, the length of the towing rope 5 is adjusted by the winch 22 on the barge 20, and the submarine scraping device S is sunk so as to be in contact with the seabed. The seabed scraping device S is then towed by the ship F via the barge 20. During this towing, the high-pressure pump 23 and seawater pump 24 of the barge 20 are driven, and seawater is injected from the nozzle lO, and the fluid motor 13 operates the swing mechanism 1) to keep each nozzle 10 in a predetermined position. Angle θ
oscillate.

As a result, the towed body 1 moves along the seabed, and as shown in FIG. 5, seawater is jetted from the nozzle 10 toward the seabed, and the jet stream causes seaweed on the seabed to peel off. , the seafloor surface is newly exposed (.

In this stroke, the towing body 1 moves so that the rear end of the cover 8 comes into contact with the seabed surface, as shown in FIG. 6 (2). In this case, as shown in Figure 6 ■, there are undulations on the sea floor, so you may encounter protruding reefs, but since the towing body 1 is formed into a flat plate, it will not be able to catch the reefs by the surface. As a result, the situation of getting caught on a reef is prevented, and the tilt is also reduced, allowing a relatively stable attitude to be maintained. In addition, as shown in Fig. 6 (■), depending on the depth, the tip portion 4 of the towing body l
may come into contact with a reef, but since the tip 4 of the towing body 1 is obliquely pointed, it is easy to deviate from the obstructing rock, and this also prevents the situation of being caught on a reef.

Further, the nozzles 10 are arranged in a plurality of rows, and each nozzle 1
Since 0 is oscillating, the jet stream will spread over a wider area, and as a result, the seafloor will be separated over a wide range, and the oscillation will also ensure that the jet is evenly distributed over this area. Therefore, the course of the towed body 1 is reliably separated.

In addition, since the nozzle 10 is covered with the cover 8, the nozzle 10 does not come into direct contact with the seabed surface (therefore, the discharge port is prevented from being damaged or clogged, and the jet stream from the discharge port of the nozzle 10 is will surely flow out from the rear end gap 15 of the cover 8 to the seabed surface.

Furthermore, in this case, even if fish and shellfish are exposed to the jet stream, they are only blown up by the jet stream and are unlikely to be killed or injured, and the impact on the survival of other living things is suppressed.

After the jet flow has passed, the detached seaweed floats to the surface because it is relatively light, but the floated seaweed is captured by the rear net 25 and fed to the surface. This prevents seaweed from being deposited on newly exposed seabed surfaces, and also prevents seaweed from drifting ashore and polluting the coast.

Furthermore, when the ship F turns in the towing direction, the towing body 1 can fall to the opposite side as shown by the dashed line in Figure 5, and the towing rope 5 can also move within the opening 21 of the barge 20. (It is easy to take turns, since it can be played easily.)

In the above embodiments, the towing body l is formed in the shape of a lattice, but it is not necessarily limited to this, and may be modified as appropriate, such as being formed in a net shape or made of a plate such as an iron plate.

[Effects of the Invention] As explained above, according to the method for scraping the seabed according to the invention of item 1, seaweed on the seabed is peeled off by the jet stream.
It has little impact on other organisms, and since it uses a jet stream, it can easily create a seabed surface on which kelp can settle. In addition, since the seaweed that has peeled off and floated to the surface is captured and collected, it is possible to prevent the seaweed from being deposited on the newly exposed seabed surface or washing ashore on the shore, thereby preventing it from polluting the sea and coast. It is possible to prevent a situation where this occurs.

In addition, according to the seabed scraping device according to the invention of item 2, seaweed on the seabed can be peeled off simply by spraying from the nozzle while towing the towing body, so it is possible to easily create a new seabed where kelp can grow. It is possible to increase the processing area per unit time, and the cost is also low (
can do. Therefore, the production cost of kelp per unit area can be reduced and productivity can be significantly improved. Additionally, since the jet stream removes seaweed on the seabed, the impact on other organisms can be reduced.

Further, according to the seabed scraping device according to the invention of item 3, in addition to the effects of the seabed scraping device according to the invention of item 2, since the towing body is formed in a flat plate shape, it is difficult to get caught on a reef. It is possible to stabilize the attitude by preventing a situation where the nozzle is damaged, and since there are multiple rows of nozzles, it has the effect of being able to ablate a wide range of seabed surfaces.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a seabed scraping device according to an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a view of its main parts, and FIG. 4 is a diagram showing a seabed scraping device according to an embodiment. FIG. 5 is a plan view showing the seabed penetration system used, FIG. 5 is a side view thereof, and FIG. 6 is a diagram showing the operation of the seabed scraping device. S... Seabed scraping device l... Towing body 8... Cover 10... Nozzle 1)... Rocking mechanism

Claims (3)

[Claims] (1) A seabed scraping method characterized by jetting a liquid toward the seabed, using the jet to peel off seaweed on the seabed, and capturing and collecting the peeled and surfaced seaweed. (2) a towing body that can be towed by a ship and move along the seabed;
A seafloor scraping device characterized by comprising a nozzle that is provided on the towing body and injects liquid toward the seabed. (3) a towing body that is towed by a ship and movable along the seabed;
A seabed scraping device is equipped with a nozzle that is installed on the towing body and injects liquid toward the seabed, and the towing body is formed into a flat plate, and a towing rope is attached to one end of the towing body. What is claimed is: 1. A seabed scraping device, characterized in that a rope attachment portion is formed, and a plurality of rows of the above-mentioned nozzles are provided on the other end side of the towing body.