KR102342175B1 - Eco-friendly dredger for pollutants sediment of sea bottom - Google Patents

Abstract

The present invention relates to an eco-friendly dredging apparatus.
In the present invention, water jet and microbubbles are sprayed in a state in which the treatment area is sealed by adhering the collection housing to the seafloor to disturb and float the contaminated surface sediments. The surface sediment floating in the collection housing is sucked by the pump and transferred to the dredging vessel. By using the eco-friendly dredging apparatus according to the present invention, water and sand components can be minimized, and only contaminated surface sediments can be selectively dredged. Accordingly, the present invention has very excellent dredging efficiency, and the post-treatment process is simplified, so that economical purification treatment is possible. In particular, in the present invention, in case the surface layer sediment is very thick and contaminants are interposed at high density in the surface layer thickness and the sand layer (in the pores), high-pressure water and/or Contaminant sediment can be floated to the top by blowing air.

Description

Eco-FRIENDLY DREDGER FOR POLLUTANTS SEDIMENT OF SEA BOTTOM

The present invention relates to a technology for reducing environmental pollution, and more particularly, to an environmental dredging technology for dredging and treating polluted sediment accumulated on the surface of the sea, river, and lake.

The surface layer of the sea floor is a basic element constituting the aquatic ecosystem along with the water layer, providing habitat for benthic organisms and is closely connected with the aquatic environment. Accordingly, contamination of the surface layer of the seabed leads to contamination of the water layer, which adversely affects the vegetation of species sensitive to environmental changes.

Contaminant sediments are a weighting and important factor in contamination of the seafloor surface. Contaminated sediments are formed when domestic sewage, livestock and livestock sewage, farm excrement, and wastewater flow into the sea and settle. And as the amount of inflow and deposition of pollutants exceeds nature's ability to self-clean, the pollution gradually intensifies. In particular, in the case of a coast with a semi-closed or closed coastline, such as the southern coast of the Republic of Korea, seawater exchange is not smooth and the pollution is rapidly intensifying. That is, the microorganisms in the surface layer decompose coastal sediments (organic matter) while consuming oxygen. However, due to the difference in density between the water layers of seawater, mixing between layers does not occur and oxygen supply is not smooth. Due to the lack of oxygen, the activity of benthic organisms in the sediment is reduced, and phosphorus and nitrogen, which are food for phytoplankton, are produced, and red tides, green algae, blue algae, and oxygen-poor water masses are generated.

In addition, when organic matter in the sediment is decomposed under anaerobic conditions, toxic by-products such as hydrogen sulfide and ammonia are generated, which can limit the number and type of living organisms in the sediment.

Conventionally, a method of spraying a chemical such as clay or quicklime has been used to treat contaminated sediments, but the clay spraying has a problem in that alumina and silica components in the clay aggregate and precipitate organic suspensions in water. In addition, calcium component in quicklime reacts with sulfate in the water to form limestone and gypsum to cover the sediment, thereby blocking the oxygen contact of organisms living inside the sediment, causing a lot of damage.

Also, conventionally, a method for dredging and treating contaminated sediments has been disclosed. Dredging is the most effective method because it removes the polluting sediment itself, but efficiency and economics are an issue. In other words, when dredging contaminated sediments in the past, contaminated sediments in the dredged material (solid matter) accounted for only 1-5% and uncontaminated sand and gravel accounted for more than 95%. Moreover, since the dredged material (solid matter) is about 10-20% and 80-90% is water, there is a difficulty in post-treatment. According to environmental regulations, once seawater is dredged on site, it cannot be immediately discharged back into the sea, and must be discharged after satisfying all environmental standards.

In addition, if the existing dredging equipment was used, the contaminated sediments spread during the dredging process, resulting in secondary pollution.

An object of the present invention is to provide a dredging apparatus with improved efficiency and economic feasibility of environmental dredging by selectively dredging only surface contaminated sediments at the bottom of the water in order to solve the above problems.

On the other hand, other objects not specified in the present invention will be additionally considered within the range that can be easily inferred from the following detailed description and effects thereof.

A dredging apparatus according to an embodiment of the present invention for achieving the above object is mounted on a dredging vessel for dredging the water bottom surface sediment in the sea, river, and lake, and is supported by hanging on a rope installed on the crane of the dredging vessel. , A collection housing with an open lower surface that can be seated on the bottom of the spoon; a water jet unit installed inside the collection housing and spraying water at high pressure toward the water bottom to disturb and float the surface sediments stabilized on the water bottom in the collection housing; a pump unit installed inside the collection housing to suck the surface sediment in the collection housing and transfer it to the dredging vessel; a moving unit for moving the collection housing up and down; and a high-pressure injection pipe which is hollow so that water or air can be injected, a plurality of discharge holes are formed in the lower part, and is vertically arranged to be elevated and installed in the collection housing; It is characterized in that the high-pressure injection pipe is inserted into the bottom of the water in a seated state to spray high-pressure water or air.

In the present invention, the lower end of the high-pressure injection pipe is preferably made of a sharp shape to facilitate insertion into the bottom surface.

The spoon is composed of a sand layer and a surface layer in which contaminants on the sand layer are piled up, and the high-pressure injection pipe is inserted into the surface layer in which the contaminants are stacked.

Alternatively, if contaminants are interposed in the pores inside the sand layer, the high-pressure injection pipe may be inserted up to the sand layer to discharge these contaminants upward.

In one embodiment of the present invention, it is preferable that the nozzle of the waterjet unit has a variable length. For example, the nozzle may be formed of a multi-stage segmented antenna structure in which the length can be extended.

In an example of the present invention, a GPS unit mounted on the collection housing to determine location information of the collection housing through a communication network may be further provided.

When the eco-friendly dredging apparatus according to the present invention is used, the amount of solids in the dredged material increases to 50 to 70% and the water decreases to 30 to 50%. Furthermore, in the present invention, water jet and microbubbles are used, and by controlling the pressure of the pump, sand with a low possibility of contamination is not dredged from the solid material, but only fine particles with a high possibility of contamination are dredged. As a result, when the eco-friendly dredging apparatus according to the present invention is used, only the surface sediments contaminated from the seabed are selectively dredged, so the efficiency of dredging is remarkably increased.

By selectively dredging only the contaminated surface sediments, the treatment capacity is reduced in the post-treatment process, enabling economical purification treatment.

In addition, since the eco-friendly dredging apparatus according to the present invention is dredged in a state in which the seabed is sealed using a collection housing, there is an advantage that secondary contamination such as turbidity increase due to disturbance and diffusion of surface sediments can be prevented.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects are treated as described in the specification of the present invention.

1 is for explaining an example in which the eco-friendly dredging apparatus for the surface layer sediment on the spoon according to an example of the present invention is installed in a dredging vessel.
FIG. 2 is a schematic longitudinal sectional view of the main part of the eco-friendly dredging apparatus shown in FIG. 1 .
3 is a schematic cross-sectional view taken along line AA of FIG. 2 .
4 is a view for explaining the operation of the waterjet unit nozzle.
5 is a view for explaining a nozzle arrangement direction of a waterjet unit according to another example.
6 is a view for explaining the operation of an eco-friendly dredging apparatus using a high-pressure injection pipe when the contaminants form a thick surface layer.
7 is a view for explaining the operation of an eco-friendly dredging apparatus using a high-pressure injection pipe when contaminants (including fine seto) are also interposed in the inside of the sand layer.
8 is a view for explaining an eco-friendly dredging apparatus having a movement barrier according to another example of the present invention.
※ It is revealed that the accompanying drawings are exemplified as a reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereby.

In the description of the present invention, if it is determined that related known functions are obvious to those skilled in the art and may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The present invention relates to an eco-friendly dredging apparatus (hereinafter referred to as an 'eco-friendly dredging apparatus') for the surface layer of the spoon. The eco-friendly dredging apparatus according to the present invention mainly aims to purify and treat coastal seabed pollution, but it can also be used to treat surface polluting sediments of rivers or lakes in addition to the sea.

Hereinafter, an environment-friendly dredging apparatus according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

1 is for explaining an example in which the eco-friendly dredging device for the surface layer sediment on the spoon according to an example of the present invention is installed in a dredging vessel.

Referring to FIG. 1 , an eco-friendly dredging apparatus 100 according to an embodiment of the present invention is installed in a dredging vessel 200 . That is, the crane 210 is provided in the dredging vessel 200 , and the two-pronged rope 211 is connected to the horizontal lift 212 . A traction line 213 is connected to both ends of the horizontal lift 212 , and the eco-friendly dredging apparatus 100 according to the present invention is supported by hanging on the traction line 213 .

The dredging vessel 200 is provided with a treatment system 220 for in-situ purification treatment of the contaminated surface sediments. For example, a system installed in a purification line for on-site treatment of contaminated soil as disclosed in prior patents No. 10-1399284 and No. 10-1647676 developed by the present inventors may be installed.

The eco-friendly dredging apparatus 100 passes through the water layer w and is seated on the water bottom. In the contaminated area, the surface sediment (s) is piled up with a certain thickness on the seabed ground (G). If the contaminated surface layer is thin, it is about 20 to 40 cm, but if there are many pollutants, such as around a farm, the contaminated surface layer may be 1 m or more.

Contamination patterns of the surface sediment (s) vary widely. For example, various pollutants such as poor quality sludge, sludge, organic matter, and heavy metals from farms may exist. In the case of ports, there is a lot of pollution by heavy metals and household wastes, and the surrounding areas are contaminated with organic matter.

In the present invention, as for selectively dredging only the bottom surface sediment (s) by an eco-friendly dredging device, it will be described with reference to FIGS. 2 and 3 .

FIG. 2 is a schematic longitudinal sectional view of the main part of the eco-friendly dredging apparatus shown in FIG. 1 , and FIG. 3 is a schematic cross-sectional view of FIG. 2 .

2 and 3, the eco-friendly dredging apparatus 100 includes a collection housing 10, a water jet unit 20, a bubble generating unit 30, a pump unit 40, a moving unit 50, and a high-pressure injection pipe ( 70) is provided.

The collection housing 10 is formed in a shape similar to a hood for absorbing smoke as a whole. That is, the lower part is formed in a circular or rectangular cross section, and the lower surface is open. And it is formed in a shape that the area gradually decreases toward the upper side. When the collection housing 10 is seated on the bottom surface, the inside is designed to be sealed. Of course, gaps may occur depending on the topography of the seafloor, and this will be explained again later.

The water jet unit 20 is for disturbing and levitating the surface sediments seated on the water bottom sealed by the collection housing 10 . The water jet unit 20 includes a water supply pipe 21 installed on the inner surface of the collection housing 10 along the circumferential direction thereof. The water supply pipe 21 is connected to a water tank (not shown) provided in the dredging vessel 200 through a cable 22 . In the water tank, water is supplied to the water supply pipe 21 by pressurizing water at a high pressure through a water jet generator. The water supply pipe 21 is provided with a plurality of nozzles 23 at regular distance intervals. The nozzle 23 is disposed downward toward the bottom of the water so that high-pressure water is sprayed on the bottom to disturb the surface sediment and float to the top. On the other hand, it may be disposed toward the center point as shown in FIG. 3 in a plan view, and in another example, it may be disposed inclined to one side as shown in FIG. 5 . When the nozzle 23 is disposed as shown in FIG. 5 , the high-pressure water is sprayed obliquely to generate a rotational flow in one direction in the collection housing 10 as a whole. When the rotational flow is generated in this way, an upward airflow is formed, which facilitates disturbance and flotation of the surface sediment (s).

Meanwhile, in the present invention, the nozzle 23 adopts a shape in which the length is variable as shown in FIG. 4 . When the surface layer (s) is formed thick, the length of the nozzle 23 is extended so that high-pressure water in the surface layer can reach the lower part of the surface layer. In the present invention, the length of the nozzle can be extended in various ways. In this example, a multi-stage segmented antenna structure is used. That is, the nozzle 23 is composed of a plurality of segments 23a, 23b, and 23c, and the middle segment 23b can enter and protrude into the largest segment 23a, and similarly, the middle segment 23b is distal to the inside. (23c) is retractable and extrudable. It is possible to vary the length of the nozzle with a multi-stage structure of at least two stages. A driving source (not shown) such as a motor (not shown) is employed to extend the length of the nozzle, and a power transmission structure (not shown) is employed, which is a known configuration and detailed description thereof will be omitted.

In this example, the water jet unit uses a water jet propulsion method used for driving a ship engine, but is not necessarily limited thereto, and any configuration that can disturb the surface sediment by spraying water at high pressure can be applied. In other words, it is added that the meaning of water jet is used as the concept of high-pressure water spray. And 'high pressure' refers to a level of pressure that can disturb and float fine particles smaller than sand (eg, 0.1mm particle size), that is, surface sediments. Alternatively, a pressure range sufficient to disturb sand particles of 0.1 mm or larger is possible. Although expressed as high pressure, the pressure range is as long as it can disturb the surface sediment or sand layer and float the surface sediment, but is not specified as a specific pressure range.

The bubble generating unit 30 supplies microbubbles to the inside of the collecting housing 10 to assist in flotation of the surface sediment disturbed by the water jet unit 20 . The bubble generating unit 30 includes an air supply pipe 31 and a nozzle 33 . The air supply pipe 31 is installed along the circumferential direction on the inner surface of the collection housing 10 . The air supply pipe 31 is connected to a compressed air generator (not shown) provided in the dredging vessel 200 through a cable 32 . The compressed air generator pressurizes air to a high pressure and supplies it to the air supply pipe (31). The nozzles 33 are installed in the air supply pipe 31 at regular distance intervals. The nozzle 33 sprays microbubbles having a size of several tens to several hundred micrometers. The microbubbles are sprayed downward or horizontally as in the waterjet unit. Microbubbles attach to the surface sediment particles and assist in their upward floatation. Therefore, spraying the microbubbles in a hi direction or a horizontal direction can increase the effect. The air supply pipe 31 is disposed above the water supply pipe 21 so that the water sprayed from the water jet unit and the microbubbles act on the surface layer together.

Meanwhile, in another example of the present invention, the water supply pipe 21 and the air supply pipe 31 are configured to rotate in a planar direction. By installing a driving source (not shown) such as a motor and a gear to rotate the water supply pipe 21 and the air supply pipe 31 , high-pressure water and microbubbles can form a rotational flow. When a rotational flow is formed, an upward flow can occur, as previously described, to promote the flotation of surface sediments.

The pump unit 40 is for dredging by sucking the surface sediment (s) in the collection housing (10). That is, when the surface sediment (s) is floated by the water jet unit 20 and the bubble generating unit 30 , the pump unit 40 sucks it and transfers it to the dredging vessel 200 . The pump unit 40 is coupled to an upper side of the collection housing 10 , and a transfer pipe 41 interconnects the pump unit 40 and the dredge vessel 200 . In this embodiment, the pump unit 40 is movable in the vertical direction. In this example, the suction pressure of the pump unit 40 is at a level capable of sucking sand particles having a particle size of approximately 0.1 mm. Among the surface sediments, organic matter and oil are lighter than sand with a size of 0.1 mm, and heavy metals are also lighter than sand with a size of 0.1 mm because there are many fine particles. By controlling the pumping pressure in this way, particles heavier than 0.1 mm of sand are not pumped. In general, particles of 0.1 mm or larger are mostly sand components, not pollutants, and contaminants are not bound to these particles. Most of the pollutants are formed of fine particles. Therefore, in order to selectively dredge only surface sediments, which are contaminants, it is desirable to adjust the pump pressure as above. This is because, when non-polluting particles such as sand are dredged, the treatment capacity only increases, but the efficiency of the purification treatment decreases.

In the present invention, the moving unit 50 is for moving the collection housing 10 in the vertical direction, and it is possible to use the power of a crane. However, it is possible to minimize the power of the crane and elevate the collection housing 10 through buoyancy. That is, in this embodiment, the buoyancy tank 51 is mounted on the upper side of the collection housing 10 . In this example, the buoyancy tank 51 is connected to the dredging vessel 200 and the cable 52 through the. The dredging vessel 200 is provided with a pump (not shown) capable of injecting and discharging water or air to the buoyancy tank. Since the collecting housing 10, the water jet unit 20, the bubble generating unit 30 and the pump unit 40 are made of a steel material, they descend by their own weight. However, if the descent speed is too fast, it becomes a problem, so you can adjust the descent speed by filling the buoyancy tank 51 with water. In the case of raising the collecting housing 10 upside down, the buoyancy tank 51 may be filled with air. The collection housing 10 can be raised and lowered by injecting and discharging a control fluid capable of controlling buoyancy, such as water or air, to the buoyancy tank 51 through the cable 52 . When the collection housing 10 is raised and lowered through buoyancy, the crane 210 functions only as a support means, but the collection housing 10 may be raised by using the power of the crane 21 . In this example, a buoyancy tank was used as the moving unit, but various other moving means may be employed.

On the other hand, the present invention is characterized in that it is inserted into the surface layer or the sand layer to provide a high-pressure injection pipe 70 capable of spraying air and/or water at high pressure. The high-pressure injection pipe 70 is movable in the vertical direction, and the lower end thereof is formed in a sharp shape for easy insertion into the surface layer or the sand layer. A plurality of discharge holes 71 are formed in the lower portion of the high-pressure injection pipe 70 to discharge high-pressure water or air. It is also possible to discharge water and air together. Here, 'high pressure' means a level of pressure capable of disturbing and floating fine particles smaller than sand (eg, 0.1 mm particle size), that is, surface sediments. Alternatively, a pressure range sufficient to disturb sand particles of 0.1 mm or larger is possible. Although expressed as high pressure, the pressure range is as long as it can disturb the surface sediment or sand layer and float the surface sediment, but is not specified as a specific pressure range.

The vertical movement of the high-pressure injection pipe is made by a driving source (not shown) such as a motor or a cylinder and a power transmission structure (not shown). A driving source and a power transmission structure are very diverse, and since these structures are well-known elements, a detailed description thereof will be omitted.

When the surface layer is very thick, the nozzle 23 is extended and used to respond, but when the high-pressure injection pipe 70 is inserted into the surface layer (s) and water (water jet method) or air (air jet method) is used at high pressure, the surface layer easy to disturb and injure. In addition, although the surface layer is thin, when contaminants are densely interposed between the sand layers (voids) below, the high-pressure injection pipe 70 is inserted into the sand layer below the surface layer and water and/or air is sprayed to move the contaminants to the top of the sand layer. can be expelled.

Meanwhile, the eco-friendly dredging apparatus 100 having the above configuration may include a GPS device and a water depth gauge (water pressure gauge). In the sea, unlike on land, it is not easy to identify the location, so location information is needed to precisely perform dredging without missing any part of the processing target area.

For example, if dredging is performed on the treatment target area using an eco-friendly dredging device, the following procedure is followed. Reference is made to FIGS. 6 and 7 .

First, the processing target area is divided into a plurality of unit areas, and location information is acquired in each unit area. The dredging device is positioned in each unit area through the GPS device attached to the eco-friendly dredging device 100 and dredging is performed. Through the above method, it is possible to dredge all areas to be treated. In addition, if the water depth information for each unit area is known, the dredging apparatus can be safely descended by acquiring the water depth in real time from the depth gauge when the dredging apparatus descends.

When the dredging device is seated on the water bottom, as shown in FIG. 6 , the water jet unit and the bubble generating unit are operated to disturb and float the surface sediments, and the pump unit sucks the floated surface sediments to perform dredging. In particular, in the present invention, a high-pressure injection pipe (yellow bar in the center) is inserted into the surface layer made of contaminated sediment. If the surface layer is thick, the nozzle is used to extend it long. This is because, when air and/or water are sprayed at high pressure with the high-pressure injection pipe inserted to the inside of the surface layer, the sediment is much easier to float.

Water is initially accommodated inside the collection housing, but once water is pumped, only solids can be selectively pumped, so the amount of water in the dredged can be drastically reduced and the amount of solids can be increased. Whereas in the past 80-90% water in the dredger was used, with this device the water could be reduced to 30-50% and the solids could be increased to 50-70%.

Moreover, in the present invention, by controlling the pump pressure, it is possible to minimize the sand component, which is less likely to be contaminated among solids, and selectively suck only fine particles including organic matter and heavy metals.

On the other hand, as shown in FIG. 7 , regardless of the thickness of the surface layer, if contaminants are interposed in the sand layer (lower surface layer), air and/or water are sprayed at high pressure while the high-pressure injection pipe is inserted up to the sand layer. . Spraying air or water leaves the sand particles intact, but contaminants (miseto) in the pores can be disturbed and floated and discharged onto the surface layer. The pollutants thus discharged are sucked by the pump.

As a result, the eco-friendly dredging apparatus according to the present invention has the advantage of selectively dredging only contaminated sediments. By selectively dredging only contaminated sediments, the treatment capacity is reduced in the post-treatment process, enabling efficient and economical purification treatment.

In addition, since dredging is performed in a state in which the collecting housing 10 seals the spoon, secondary contamination such as increasing turbidity by expanding and dispersing contaminants in the sea area can be prevented unlike the existing ones.

On the other hand, in the present invention, a movement blocking film is installed in order to strengthen the sealing function of the collection housing 10 . The movement blocking film 60 may be installed in contact with the outer or inner surface of the collection housing 10 . Also, in another example, the collection housing 10 may be made of double walls and a movement barrier may be installed between the double walls. In this example, the movement blocking membrane 60 is installed on the outer surface of the collection housing 10 .

Referring to FIG. 8 , the movement blocking film 60 is formed to correspond to the outer surface of the collection housing 10 and is movable in the vertical direction. That is, the cylinder 61 is fixed to the inside of the collection housing 10 , and the piston 62 of the cylinder is coupled to the support 63 . A long hole 15 is formed on one side of the outer surface of the collection housing 10 in the vertical direction, and the support 63 is coupled to the movement blocking membrane 60 through the long hole 15 . That is, one side of the support 63 is coupled to the piston 62 and the other side is coupled to the movement blocking membrane 60 . According to the operation of the cylinder 61, the movement blocking film 60 may move in the vertical direction. In a state in which the collection housing 10 is seated on the bottom of the spoon, the movement blocking membrane 60 is positioned higher than the lower end of the collection housing 10, and when the cylinder 62 operates, the movement blocking membrane 60 descends and is shown in FIG. It is inserted under the spoon as shown in the enlarged drawing. Since there is a curve in the bottom surface, a gap may occur between the collection housing 10 and the bottom surface, and in this case, the suction function of the pump may be weakened, so the sealing property is supplemented through the movement blocking membrane 60 .

In this example, the lower portion of the movement blocking membrane 60 is formed in a sharp wedge shape or in a shape such as a cog wheel to be easily inserted into the seabed ground. The seabed ground is made of sand, and the insertion depth is also several tens of Cm, so a great force is not required to insert the movement blocking membrane 60 into the sea floor.

On the other hand, when the movement blocking membrane 60 is installed on the outside of the collection housing 10 , sealing is also required between the movement blocking membrane 60 and the collection housing 10 . In this example, the upper portion 65 of the movement blocking film 60 is bent and adhered to the outer surface of the collection housing 10, and sealing member 67 such as rubber is interposed to enhance the sealing property. Even when the movement blocking film 60 is lowered to the maximum, the sealing can be maintained because the bent upper portion 65 does not descend to the long hole 15 of the collection housing 10 .

It is expected that, by using the eco-friendly dredging apparatus according to the present invention, it is possible to very effectively and economically purify contaminated areas such as coasts, ports, and fish farms.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

100 ... eco-friendly dredging equipment for bottom surface sediment, 200 ... dredging vessel
10 ... collection housing, 20 ... water jet unit, 30 ... air jet unit
40 ... pump unit, 50 ... moving unit 60 ... moving barrier
70 ... high pressure injection pipe s ... surface sediment w ... water layer

Claims (6)

It is mounted on a dredging vessel that dreds the bottom surface sediments in the sea, river, and lake,
a collection housing supported by hanging on a rope installed on the crane of the dredging vessel, and having an open lower surface to be seated on the water bottom;
a water jet unit installed inside the collection housing and spraying water at high pressure toward the water bottom to disturb and float the surface sediments stabilized on the water bottom in the collection housing;
a pump unit installed inside the collection housing to suck the surface sediment in the collection housing and transfer it to the dredging vessel;
a moving unit for moving the collection housing up and down; and
It is hollow so that water or air can be injected, a plurality of discharge holes are formed in the lower part, and a high-pressure injection pipe which is arranged long in the vertical direction and is installed in the collection housing so as to be able to move up and down; and
In a state where the collection housing is seated on the bottom surface, the high-pressure injection pipe is inserted into the bottom surface to spray high-pressure water or air,
Further comprising: a movement blocking membrane formed in an annular shape along the circumferential direction of the collection housing and installed so as to be able to move up and down with respect to the collection housing,
When the movement blocking membrane descends in a state in which the collection housing is seated on the bottom of the spoon, it is inserted into the lower side of the bottom to seal the inside of the collection housing,
The movement blocking membrane is installed on the outer surface of the collection housing,
A cylinder fixed to the inside of the collection housing and having a piston movable in a vertical direction, and one end fixed to the piston and the other end fixed to the movement blocking membrane through a long hole penetrating through one side of the collection housing. So,
An eco-friendly dredging device for surface layer sediments, characterized in that the movement barrier is raised and lowered according to the operation of the cylinder.

The method of claim 1,
The lower end of the high-pressure injection pipe is an eco-friendly dredging device for surface layer sediments, characterized in that it has a sharp shape. 3. The method of claim 2,
The spoon is composed of a sand layer and a surface layer in which contaminants on the sand layer are piled up,
The high-pressure injection pipe is an eco-friendly dredging device for surface layer sediments, characterized in that it is inserted into the surface layer or the sand layer in which the contaminants are interposed in the pores. The method of claim 1,
The nozzle of the waterjet unit is an eco-friendly dredging device for surface sediments, characterized in that the length is variable. 5. The method of claim 4,
The nozzle is an eco-friendly dredging device for surface layer sediments, characterized in that it has an antenna structure that can be extended in length by being made of multi-stage segments. The method of claim 1,
The eco-friendly dredging device for surface sediments on the spoon, characterized in that it further comprises a GPS unit mounted on the collection housing to determine the location information of the collection housing through a communication network.

Images