JP2020079072A - Aquatic plant removal device and aquatic plant removal method - Google Patents

Abstract

To provide an aquatic plant removal device and an aquatic plant removal method capable of improving aquatic plant work efficiency by preventing water from clouding and interfering with visibility of a worker carrying out weeding work by diving when aquatic plant is removed from the bottom of a lake.SOLUTION: Compressed high pressure air from an air supply source 2 is guided in between vertical cylinder unit 10 and a water outflow member 17 from a communication port 16 through an air supply hose 3 and an air supply cylinder unit 12, rises along an air rising passage UP, and further rises up inside the vertical cylinder unit 10. A powerful water flow is created in the vertical cylinder unit 10 along with rising of high pressure air, water WA of a lake is guided to the vertical cylinder unit 10 through a horizontal cylinder unit 11 from a suction opening 11K, efficient rapid water flow is created in the water by the narrowed water outflow member 17, suction from the suction opening 11K is made stronger, the suction opening 11K sucks in a portion close to the root of a stem of the aquatic plant WP from the horizontal direction, and pulls out by sucking in the stem while bending it.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to an aquatic plant removing apparatus for removing aquatic plants growing at the bottom of a lake and a method for removing aquatic plants growing at the bottom of a lake.

  In order to prevent not only the target object but also surrounding objects other than the target object from being sucked, for example, a technique disclosed in Patent Document 1 is disclosed. That is, according to this technique, while a worker wearing a diving suit injects air to the target object with a diving air gun, the ballast tank floats and sinks the underwater boat, and the air lift sucks and removes the target object. is there.

JP, 2014-94731, A

  However, according to this conventional technique, when the target is aquatic plants, by injecting air to the bottom of the lake, which is the root of the aquatic plants growing with an air gun, when removing the aquatic plants from the bottom of the lake, There is a problem in that the soil and the like at the bottom rises and the water becomes turbid, which hinders the field of view of an operator who dives to perform weeding work, resulting in deterioration of work efficiency of water plants. Further, a facility for injecting air to the target object and a facility for sucking and removing the target object, which is separate from the facility, are required, which is complicated.

  Therefore, in view of the above problems, the present invention, when removing the aquatic plants from the bottom of the lake, does not hinder the visibility of the worker who dives by weeding to prevent water from becoming muddy, and the work efficiency of the aquatic plants. It is an object of the present invention to provide an aquatic plant removing device and a aquatic plant removing method that can remove the aquatic plants in a state where soil and sand are not attached to the lower part of the plant as much as possible.

  Therefore, the first aspect of the present invention is an apparatus for removing aquatic plants that grows on the bottom of a lake, wherein an air supply source for supplying compressed air and compressed air from the air supply source pass through an air supply hose. Using the air pressure supplied, a portion near the root of the stem of the aquatic plant is sucked from the suction port from the horizontal direction to extract it from the bottom sediment, and the aquatic plant extracted by this extracting device is taken from the lake. It consists of a guide hose that guides upwards from the water, a spouting member attached to the upper end of the guide hose, and a recovery net that collects the aquatic plants that have been spouted out with water from the spouting port of the spouting member. And a recovery device.

  A second invention is the first invention according to the first invention, wherein the withdrawal device has a hollow cylindrical shape extending in a vertical direction and an upper end thereof is connected to the guide hose, and a vertical cylinder portion has one end at a lower portion thereof. A horizontal cylindrical portion in which the suction ports are opened in the horizontal direction at the other end, and one end is connected to the air supply hose and the other end is in the vertical direction of the vertical cylindrical portion. It is characterized in that it is composed of an air supply cylinder portion connected to the side surface at an intermediate position.

  Further, a third invention is the second invention, in removing the aquatic plants, when the lower end of the horizontal tubular portion of the pulling device is grounded to the bottom of the lake, the horizontal tubular portion is With a structure in which the suction port is arranged at a position away from the bottom of the lake, so that the portion close to the root of the stem of the aquatic plant is sucked from the suction port from the horizontal direction so that the stem is bent while being pulled out. It is characterized by having done.

  A fourth invention is characterized in that, in the second invention, as the horizontal tubular portion, a suction tubular portion of a different type is detachably provided in a tubular portion forming a part thereof.

  Further, in a fifth aspect based on the first aspect, when compressed air from the air supply source is supplied from the communication port of the air supply tube into the vertical tube, the entire circumference thereof is covered. A water outflow member that forms an air rising passage between the vertical cylinder and the inner surface of the side wall of the vertical cylinder and forms a flow path of water sucked from the suction port of the horizontal cylinder in the vertical cylinder. It is characterized by that.

  In a sixth aspect based on the first aspect, the spouting member has a hollow cylindrical shape having an L-shaped outer shape, extends in a direction in which the guide hose is extended as it is, and has a lower end portion. It is characterized in that it is composed of one portion connected to the guide hose, and the other portion formed by bending the one portion so as to be orthogonal to the other portion and having the spout at the end portion.

A seventh invention is a method for removing aquatic plants that grows on the bottom of a lake,
Compressed air from an air supply source is supplied through an air supply hose, and by utilizing this air pressure, a portion of the aquatic plant near the root of the aquatic plant stem is sucked in from the horizontal direction by the suction port of the drawing device. Pull out from the bottom sediment,
Guide the extracted water plants upward from the water of the lake through a guide hose,
It is characterized in that the aquatic plants that are poured out together with water from a pouring outlet of a pouring member attached to the upper end of the guide hose are collected by a collecting net.

  The present invention, when removing aquatic plants from the bottom of a lake, so as not to hinder the visibility of the workers who do the weeding work by diving so that the water does not become turbid, improve the work efficiency of the aquatic plants, and to the utmost. It is possible to provide an aquatic plant removing device and a aquatic plant removing method capable of removing the aquatic plant under the condition that no soil is attached to the lower part of the aquatic plant. Further, even when aquatic plants are removed in a shallow lake, the suction force of water or the like can be increased, and the aquatic plants can be easily pulled out from the bottom of the lake. In addition, since the collected water plants are reliably collected by the collection device, there is no need to scatter the water plants and the water plants discharged from the pouring member together with the water are cut by the collection net that constitutes the collection device. Since it is reduced as much as possible by making it small, the amount of scattering by passing through the mesh of the recovery net to the outside of the recovery net is reduced, and it is possible to surely recover. Furthermore, by using different-diameter small-diameter tubular portions for the horizontal tubular portion of the pulling device, it is possible to change the horizontal tubular portion depending on the type of aquatic plant and the place where it grows.

It is the figure which simply represented the whole which shows embodiment of this invention. It is a principal part enlarged view of FIG. As a horizontal tubular portion of the pulling device, there is an embodiment in which a small-diameter tubular portion as a suction tubular portion of a different type is attachable to and detachable from a large-diameter tubular portion that is a tubular portion forming a part of the horizontal tubular portion. It is a figure which shows the state removed. FIG. 4 is a diagram showing a state in which the small-diameter tubular portion is attached in the embodiment shown in FIG. 3.

  Hereinafter, based on FIG. 1 and FIG. 2, a waterweed removing apparatus 1 for removing waterweed WP growing in sediment ES of a lake LB such as a lake, a swamp, a pond, a lake at a boat race, and the bottom LB of the lake. The aquatic plant removal method for removing the aquatic plant WP that grows in the above will be described in detail. First, as shown in FIG. 1, the aquatic plant removing apparatus 1 is roughly divided into an air supply source 2 for supplying compressed air, and an air supply hose 3 for which compressed air from the air supply source 2 is flexible. Is supplied via the air pressure and draws the aquatic plant WP out of the sediment ES of the bottom LB, and the aquatic plant WP extracted by the extracting unit 4 from the water of the lake. A bellows-shaped guide hose 5 that guides upward, a spout member 6 attached to the upper end of the flexible guide hose 5, and a collecting device that collects the aquatic plant WP spouted from the spout member 6. 7 and. Therefore, the aquatic plant removing device 1 can simplify the work of removing aquatic plants from the bottom of the lake.

  It should be noted that the air supply hose 3 and the guide hose 5 are each selected in an appropriate length according to the water depth of the lake, or by connecting a plurality of hoses to add or reduce the number of connections. Can handle.

  When power (battery) is supplied by the operation of an on/off switch (not shown) by an operator, the air supply source 2 such as a compressor is driven to compress air, and the compressed air is supplied. Is supplied to the extraction device 4 via the air supply hose 3 connected via a connector 8. The air supply source 2 is provided on a work boat WB on which at least one worker is aboard.

  As shown in FIG. 2, the pull-out device 4 has a generally L-shaped appearance, and is roughly divided into a vertical hollow cylindrical vertical tubular portion 10 and a lower end of the vertical tubular portion 10. Are connected so that they are orthogonal to each other (at a right angle), and the other end has a horizontal cylindrical portion 11 in which a suction port 11K is opened in the horizontal direction, and one end is connected to the air supply hose 3 and the other end is vertical. It is composed of an air supply cylinder portion 12 connected to a side surface at an intermediate position in the vertical direction of the cylinder portion 10. That is, the pulling-out device 4 has a substantially L-shaped appearance, and is composed of the vertical tubular portion 10 and the horizontal tubular portion 11 that is connected to the vertical tubular portion 10 at a right angle.

  Further, although the vertical tube portion 10, the horizontal tube portion 11 and the air supply tube portion 12 are made of hard synthetic resin in the present embodiment, they may be made of metal such as iron.

  Then, the lower end portion of the air supply hose 3 is fixed to the air supply cylinder portion 12 via a connecting means 13. That is, the connecting means 13 is, for example, one connecting member having a female screw (or a male screw) provided on the lower end portion of the air supply hose 3 formed on the inner wall thereof, and an upper end portion of the air supply tube portion 12. The provided male screw (or female screw) is composed of the other connecting member formed on the outer wall, and the male screw (or female screw) of the other connecting member and the female screw of the one connecting member. (Or a male screw) is screwed to fix the lower end of the air supply hose 3 having the same inner diameter as the air supply cylinder 12 to the upper end of the air supply cylinder 12. The connecting means 13 may have various connecting methods and structures, and the type thereof does not matter.

  As shown in FIG. 2, the horizontal tubular portion 11 of the pulling device 4 includes a hollow cylindrical large-diameter tubular portion 11A and a small-diameter tubular portion 11B communicating with the large-diameter tubular portion 11A. The tubular portion 11B has a first small-diameter tubular portion 11B1 (which is hollow and has an outer shape of a truncated cone) that directly communicates with the large-diameter tubular portion 11A, and a hollow cylindrical shape that communicates with the first small-diameter tubular portion 11B1. It is composed of the second small diameter tubular portion 11B2. The first small-diameter cylindrical portion 11B1 has an internal space in which the diameter gradually decreases from the large-diameter cylindrical portion 11A toward the second small-diameter cylindrical portion 11B2. It should be noted that the small-diameter cylindrical portion 11B of the horizontal cylindrical portion 11 is not divided into the first small-diameter cylindrical portion 11B1 and the second small-diameter cylindrical portion 11B2, but as one small-diameter cylindrical portion, the diameter gradually decreases toward the top. The outer shape may be a hollow shape having a truncated cone shape.

  Therefore, when weeding the aquatic plant WP, in the state where the lower end portion of the side surface of the hollow cylindrical large-diameter cylindrical portion 11A is brought into contact with the bottom LB of the lake (the substantially horizontal bottom LB) to be grounded, The central axis of the hollow portion of the horizontal tubular portion 11 of the drawing device 4 is parallel to the upper surface of the bottom LB, and the first small diameter tubular portion 11B1 communicating with the large diameter tubular portion 11A is connected to the second small diameter tubular portion 11B2. Toward the bottom LB, and the lower end portion of the second small-diameter cylindrical portion 11B2 is separated from the bottom LB by, for example, about 2 cm (may be longer or shorter than 2 cm). , Produced. Therefore, when the lower end of the side surface of the cylindrical large-diameter tubular portion 11A is in contact with the bottom LB of the lake and grounds, the lower end of the suction port 11K of the horizontal tubular portion 11 is the bottom LB of the lake. Therefore, it is arranged at a position separated by, for example, about 2 cm.

  Then, the large-diameter cylindrical portion 11A, the first small-diameter cylindrical portion 11B1 and the second small-diameter cylindrical portion 11B2 have concentric circles in the shape of the longitudinal section, and the ends of the second small-diameter cylindrical portion 11B2 are open. The suction port 11K serves to suck the water grass WP and the water WA of the lake. However, the large-diameter cylindrical portion 11A and the small-diameter cylindrical portion 11B do not necessarily have to have concentric circular openings.

  Therefore, at the time of removing the water grass WP, when the lower end of the side surface of the large diameter tubular portion 11A is in contact with the bottom LB of the lake, the lower end of the suction port 11K of the small diameter tubular portion 11B is the bottom. Since it will open in the horizontal direction (lateral direction, the same applies below) at a distance of about 2 cm above LB, when pulling out the aquatic plant WP growing in the earth and sand ES of the bottom LB, The suction port 11K sucks the portion near the root of the stem of the aquatic plant WP (the boundary between the stem and the root), that is, the portion of the portion of the earth and sand ES that comes out of the water close to the root, from the horizontal direction by the suction port 11K. You will pull it while bending the stem. That is, by sucking a portion of the aquatic plant WP near the root of the stem from the suction port 11K from the horizontal direction, the pulling-out device 4 bends the aquatic plant WP by folding back from the suction side tip of the aspirated stem. It will be pulled out from the earth and sand ES of the bottom LB.

  Therefore, since the suction port 11K is separated from the bottom LB and opens upward in the horizontal direction (lateral direction), it is possible to prevent suction of stones, shellfish, etc. in the earth and sand ES of the bottom LB. At the same time, since it is pulled up diagonally upward, it can be pulled out so that the earth and sand ES is not attached to the root of the aquatic plant WP as much as possible as compared with the structure in which it is pulled out right above. Therefore, in order to prevent the water from becoming turbid, diving is carried out by wearing a diving suit and sending air through a hose connected to an air supply device provided in the work boat WB and wearing a diving helmet capable of exhausting air. Thus, it is possible to improve the working efficiency of the water grass WP by not hindering the field of view of the worker DI who performs the weeding work.

  The inner diameter of the vertical cylindrical portion 10 and the large-diameter cylindrical portion 11A of the horizontal cylindrical portion 11 of the pulling device 4 is, for example, about 100 mm, and the inner diameter of the second small-diameter cylindrical portion 11B2 (circular suction port 11K The diameter) is, for example, 65 mm. In this way, by reducing the diameter of the suction port 11K, the suction pressure is increased and the suction force of the water WA or the like is strengthened even when the removal work of the aquatic plants WP is performed in a shallow lake with a water depth of about 2 m50 cm. Therefore, the aquatic plant WP is easily pulled out from the earth and sand ES of the bottom LB.

  The air supply tube portion 12 is connected to the lower end of the air supply hose 3, and the inner diameters of the air supply hose 3 and the air supply tube portion 12 are, for example, about 15 mm. An opening/closing adjustment valve 15 is provided on the side of the air supply tube portion 12, and if the opening/closing adjustment valve 15 is closed, the communication between the air supply hose 3 and the drawing device 4 is cut off. , If it is fully opened or opened to an arbitrary opening, the communication state is established.

  The air supply cylinder portion 12 communicates with the vertical cylinder portion 10 through a circular communication opening 16 formed in the vertical cylinder portion 10. The lower end of the water outflow member 17 is welded to the inner surface of the side wall. The water outflow member 17 has a lower end portion welded and fixed to the inner surface of the side wall of the vertical cylindrical portion 10 and a hollow base portion 17A having a truncated cone shape, and the vertical cylindrical portion 10 having an inner diameter of about 100 mm. And a hollow cylindrical portion 17B having a concentric circle and an outer diameter of about 75 mm. In this case, the communication port 16 is formed so as to face the cylindrical portion 17B and the base portion 17A. It should be noted that the water outflow member 17 may not be divided into the base portion 17A and the cylindrical portion 17B, but may be a hollow shape having a truncated cone shape in which the diameter gradually becomes smaller toward the upper portion.

  The outer diameter of the cylindrical portion 17B is about 75 mm, the inner diameter is about 65 mm, and the inner surface of the side wall of the vertical cylindrical portion 10 of the pulling device 4 having the inner diameter of 100 mm and the water outflow member 17 are separated from each other. An air rising passage UP for the compressed high pressure air is formed therebetween. That is, the air rising passage UP is formed between the inner surface of the side wall of the vertical tubular portion 10 over the entire outer circumference of the water outflow member 17 having a smaller diameter than the vertical tubular portion 10 and having a smaller opening area. At the same time, a flow path FP of water WP sucked from the suction port 11K of the horizontal tubular portion 11 is formed inside.

  Therefore, the compressed high-pressure air from the air supply source 2 passes through the air supply hose 3 and the air supply cylinder 12 from the communication port 16 to the space between the vertical cylinder 10 and the water outflow member 17. When it is introduced, it rises along the air rising passage UP and further rises in the vertical cylindrical portion 10. As the high-pressure air rises, an ascending water flow is generated, so that the aquatic plant WP is pulled out from the bottom LB, and the water WA and the aquatic plant WA are the horizontal tubular portion 11, the vertical tubular portion 10, and the water outflow member 17. Then, the inside of the vertical tubular portion 10 is raised again, and eventually the water grass WP is collected by the collecting device 7 after being discharged through the guide hose 5 and the discharging member 6.

  In this case, as described above, the compressed high-pressure air from the air supply cylinder portion 12 is not directly blown into the vertical cylinder portion 10 through which the waterweed WP passes, and the water bubbles BB are also finely divided to the vertical direction. The water bubbles BB are collected around the water outflow member 17 so that a large amount of water WA passes through the center of the tubular portion 10, and the rising water WA and the waterweed WP in the flow path FP of the water outflow member 17 are collected. Do not apply high pressure air directly to. When high-pressure air is directly applied to the ascending water WA and the aquatic grass WP in the vertical tube portion 10, a turbulent air flow is generated in the ascending water WA and the aquatic grass WP, and an efficient ascending water flow cannot be created. However, according to the present embodiment, such a problem can be solved.

  Then, as the compressed high-pressure air rises as described above, the water WA of the lake from the suction port 11K is guided into the vertical tube portion 10 through the horizontal tube portion 11, and the water WA is narrowed. In addition, the water outflow member 17 enables an efficient and quick water flow, and the suction from the suction port 11K becomes strong, so that the work efficiency for sucking the aquatic plants WP is increased even at a shallow water depth. In addition, BL shown in FIG. 2 indicates a boundary between the high-pressure air from the air supply cylinder 12 and the water WA in the vertical cylinder 10.

  Since the connecting member 20 is provided at the lower end of the guide hose 5 and the connecting portion 21 is formed at the upper end of the vertical tubular portion 10, the connecting member 20 and the connecting portion 21 are connected to each other. Are butt-joined to each other, for example, by bolts and nuts, and the guide hose 5 and the vertical tube portion 10 each having an inner diameter of 100 mm are connected.

  Further, since the connecting member 22 is provided at the upper end of the guiding hose 5 and the connecting portion 23 is formed at the end of the pouring member 6, the connecting member 22 and the connecting portion 23 are connected to each other. In the abutted state, the guide hose 5 and the pouring member 6 are connected to each other by, for example, bolts and nuts. The connecting member 22 and the connecting portion 23 are made of, for example, a hard synthetic resin material.

  The spouting member 6 is made of, for example, a hard synthetic resin material, has a hollow cylindrical shape with a generally L-shaped outer shape, and extends in a direction in which the guiding hose 5 is extended as it is, and extends toward the lower end portion. It is composed of one portion 6A in which the connecting portion 23 is formed, and the other portion 6B formed by bending the portion 6A at a right angle (so as to be orthogonal to each other) and having a spout 6C at the end portion. ..

  The collecting device 7 collects the waterweed WP poured out together with the water WP from the spout 6C of the pouring member 6, and a synthetic resin collecting net 25 for storing the waterweed WP, It forms the intake opening of the recovery net 25, and has a specific gravity smaller than that of water, and is made of, for example, lumber, and has an intake port forming member 26 (acting as a floating ring) framed in a quadrangular shape in plan view, for example. Composed.

  Although not shown, the inlet port forming member 26 is provided with a fixing tool (not shown) such as a cord for fixing the guide hose 5, and the inlet port forming member 26 is formed with the fixing member. The guide hose 5 with its tip inserted from the intake port is fixed to the intake port forming member 26 by the fixing tool. Even when the guide hose 5 is fixed to the intake port forming member 26 to collect the aquatic plants WP, the recovery device 7 as a whole is light and the recovery device 7 is floating in water. (See Figure 1).

  Then, the compressed high-pressure air from the air supply source 2 is supplied through the air supply hose 3, and by utilizing this air pressure, the extraction device 4 sucks the water plants WP and the earth and sand ES of the bottom LB. The water plant WP extracted from the inside is lifted together with the water WA through the guide hose 5 so that the water WA containing the water plant WP is extracted from the spout member 6 to the recovery device 7. When it is discharged into the recovery net 25, it is reliably recovered by the recovery net 25, so that it is not scattered and it takes time to recover.

  That is, as shown in FIG. 1, the air rising in the guiding hose 5 makes contact with and pushes up the side portion of the recovery net 25 in a state in which the spouting member 6 is inclined and laid down. Therefore, the other portion 6B faces downward, discharges the water WA containing the waterweed WP downward from the spout 6C, and the side of the recovery net 25 with which the spout member 6 is in contact. Is discharged toward the side farther from the pouring member 6 facing the part (the pouring outlet 6C is directed downward), so that the water grass WP discharged together with water from the pouring member 6 is the recovery net. Since the size cut and reduced by 25 is reduced as much as possible, scattering by passing through the mesh of the collecting net 25 to the outside of the collecting net 25 is reduced, and it is possible to surely collect.

  Further, the spout member 6 has an L-shaped outer shape, and is formed by bending the one portion 6A extending in a direction in which the guiding hose 5 is extended as it is, and the portion 6A at a right angle. In addition, since it is composed of the other portion 6B and the other portion 6B, if the pouring member has a structure having only a portion that extends in the direction in which the guide hose 5 is extended as it is, the pouring member and the guide member at the time of discharging described above. The reaction hose 5 moves backward (reverse to the discharging direction) due to the reaction, but such a problem does not occur, and the water grass WP contained in the water WA that moves straight forward vigorously is the recovery net 25. It is also prevented from coming off.

  With the above configuration, the operation will be described below. First, in a state where the opening/closing adjustment valve 15 is closed, the extraction device 4 connected to the air supply hose 3 and the guide hose 5 whose upper portion is fixed to the recovery device 7 is connected to the water of a lake. Throw in.

  Then, the worker DI who dives in the water of the lake to perform weeding work opens the opening/closing adjustment valve 15 at an arbitrary opening degree and uses a wire telephone with a worker on the work boat WB. Then, the aquatic plant removing work for removing the aquatic plant WP growing on the bottom LB of the lake is started.

  That is, when a worker on the work boat WB operates the on/off switch to drive the air supply source 2, the high-pressure air compressed by this drive is pulled through the air supply hose 3 to the drawing device. 4 is supplied.

  At this time, the compressed high-pressure air from the air supply source 2 passes through the air supply hose 3 and the air supply cylinder 12 from the communication port 16 to the space between the vertical cylinder 10 and the water outflow member 17. Is introduced into the vertical cylinder portion 10 and then rises along the air rising passage UP and further inside the vertical cylinder portion 10.

  Along with the rising of the rising high-pressure air, a vigorous water flow is formed in the vertical cylindrical portion 10, and the air supply hose 3, the drawing device 4, and the guide are gradually introduced from the state of sleeping in the water of the lake. Since the hose 5 is in an upright state (however, the upper part of the guide hose 5 is gently bent in the horizontal direction.) The worker DI grabs the pulling device 4 and moves it near the aquatic plant WP growing on the bottom LB of the lake, and the lower end of the side surface of the large-diameter tubular portion 11A is grounded on the bottom LB of the lake.

  At this time, the high-pressure air from the air supply tube portion 12 is not directly blown into the vertical tube portion 10 through which the aquatic plant WP passes, and the water bubbles BB are also finely divided to the central portion of the vertical tube portion 10. The water bubbles BB are collected around the water outflow member 17 so as to allow a large amount of water to pass, and the high pressure air is not directly applied to the rising water WA in the water outflow member 17, so that the rising water WA is not exposed to the rising water WA. Efficient updrafts are created without turbulence.

  Therefore, as the high-pressure air rises, the water WA of the lake from the suction port 11K is guided into the vertical tube section 10 through the horizontal tube section 11, and the water is efficiently supplied by the narrowed water outflow member 17. And a strong water flow, the suction from the suction port 11K becomes strong, and the suction port of the second small-diameter cylindrical portion 11B2 is separated from the bottom LB and opens in the horizontal direction. 11K sucks the portion near the root of the stem of the aquatic plant WP (border between the stem and the root), that is, the portion of the portion of the sediment ES that comes out into the water close to the root of the stem, from the horizontal direction. The pulling-out device 4 pulls out the aquatic plant WP from the earth and sand ES of the bottom LB while folding back the folded stem from the suction-side tip portion (see FIG. 2 ).

  In this case, since the suction port 11K is oriented in the horizontal direction, suction of stones, shellfish, etc. in the earth and sand ES of the bottom LB is prevented, and the aquatic plant WP is pulled up obliquely upward. Therefore, as compared with the structure in which it is pulled out immediately above, it can be pulled out so that the earth and sand ES is not attached to the root of the waterweed WP as much as possible.

  When the high-pressure air is introduced from the communication port 16 between the vertical tubular portion 10 and the water outflow member 17 during the withdrawal as described above, the high-pressure air is introduced into the air rising passage UP. As a result, the high pressure air is not directly blown into the vertical tube portion 10 through which the aquatic plant WP passes, and the water bubbles BB are also finely divided. The water bubbles BB are collected around the water outflow member 17 so that a large amount of water WA passes through the flow path FP at the center of the vertical tubular portion 10, and the rising water WA and the water in the water outflow member 17 and the The high pressure air is not directly applied to the waterweed WP, turbulence does not occur in the ascending water WA and the waterweed WP, and it is possible to create an efficient upward water flow, and with the rise of the high pressure air, The water guided from the suction port 11K through the horizontal cylindrical portion 11 into the vertical cylindrical portion 10 can be efficiently and quickly generated by the narrowed water outflow member 17, and the water is sucked from the suction port 11K. Even when the water depth is shallow, it is possible to improve the work efficiency of suctioning the aquatic plants WP.

  Then, the water plant WP pulled out by the pulling device 4 is raised together with the water WA via the guide hose 5, and the water WA containing the water plant WP is collected from the pouring member 6 by the collecting device 7. It is discharged into the net 25. In this case, the air rising in the guiding hose 5 comes into contact with and pushes up the side of the recovery net 25 in a state where the extraction member 6 is inclined and laid down. The other portion 6B of the member 6 faces downward, discharges the water WA containing the waterweed WP downward from the spout 6C, and the side of the recovery net 25 with which the spout member 6 is in contact. The water plant WP discharged together with water from the pouring member 6 is discharged toward the side part far from the pouring member 6 facing the part (the pouring port 6C is directed downward). Since the size cut by the net 25 and reduced in size is reduced as much as possible, the scattering caused by passing through the net of the recovery net 25 to the outside of the recovery net 25 is reduced and the waste can be reliably recovered.

  In this way, the worker DI performing the weeding work by diving moves the pulling device 4 while the pulling device 4 pulls the aquatic plants WP group one after another from the sediment ES of the bottom LB of the lake. It is collected by the collecting device 7. Therefore, since the pulled-out aquatic plants WP are collected by the collecting device 7, there is no need to collect them in a scattered manner. Eventually, when the removal work of the waterweed WP is finished, the air supply of the air supply source 2 is stopped and the opening/closing adjustment valve 15 is closed. Further, the aquatic plant removing device 1 is pulled up to the work boat WB, and the whole process is completed.

  In the above embodiment, in the state where the lower end portion of the side surface of the large diameter tubular portion 11A is grounded to the bottom LB of the lake, the suction port 11K of the second small diameter tubular portion 11B2 is, for example, from the bottom LB. About 2 cm, it will open upward in the horizontal direction, but with respect to the opening area of the suction port 11K, the size and shape of the inner diameter, the distance from the bottom LB of the lower end thereof, etc. of the water plant WP. It may be changed depending on the type and place where it grows.

  That is, the horizontal tubular portion 11 is composed of a large-diameter tubular portion 11A1 and a small-diameter tubular portion 11D, and the large-diameter tubular portion 11A1 which is a tubular portion forming a part of the horizontal tubular portion 11 is a suction tube of a different type. An embodiment in which the small-diameter cylindrical portion 11D as a portion is detachably attached will be described below with reference to FIGS. 3 and 4. That is, a structure for attaching and detaching the small-diameter tubular portion 11D having different types such as the opening area, the size and shape of the opening diameter, and the distance from the bottom LB to the large-diameter tubular portion 11A1 will be described below.

  The small-diameter tubular portion 11D includes a hollow-cylindrical fitting portion 11D1 into which the large-diameter tubular portion 11A1 is detachably fitted, and a first small-diameter tubular portion 11D2 that is in communication with the fitting portion 11D1. And has a hollow cylindrical second small diameter cylindrical portion 11D3 communicating with the first small diameter cylindrical portion 11D2. The first small-diameter cylindrical portion 11D2 has an internal space in which the diameter gradually decreases from the fitting portion 11D1 toward the second small-diameter cylindrical portion 11D3.

  That is, the outer diameter of the large-diameter tubular portion 11A1 is, for example, 110 mm, and the inner diameter of the fitting portion 11D1 into which the large-diameter tubular portion 11A1 is fitted is also about 110 mm, and the second small-diameter tubular portion of the previous embodiment. While the inner diameter of the portion 11B2 (the diameter of the circular suction port 11K) is 65 mm, the inner diameter of the second small diameter tubular portion 11D3 (the diameter of the circular suction port 11K1) of this embodiment is, for example, 80 mm. . The first small-diameter cylindrical portion 11D2 and the second small-diameter cylindrical portion 11D3 are not divided, but as one small-diameter cylindrical portion, a hollow shape in which the outer shape gradually becomes smaller toward the upper part is a truncated cone shape. It may be one of

  Then, from the state shown in FIG. 3 to the large-diameter tubular portion 11A1 configured as described above, the small-diameter tubular portion 11D serving as a suction tubular portion is changed to the large-diameter tubular portion 11A1 by the small-diameter tubular portion 11A1. The part 11D is fitted and attached from the outside.

  That is, the large-diameter tubular portion 11A1 is fitted into the fitting portion 11D1 of the small-diameter tubular portion 11D from the tip end side thereof, and the tip portion of the large-diameter tubular portion 11A1 is connected to the inner wall of the first small-diameter tubular portion 11D2 and the first small-diameter tubular portion 11D2. 2 The small-diameter tubular portion 11D3 is fitted and attached until it reaches the boundary with the inner wall (until it abuts and stops). In addition, the outer diameter of the fitting portion of the small-diameter tubular portion as the suction tubular portion and the inner diameter of the large-diameter tubular portion 11A1 are set to be substantially the same, and the fitting portion is attached by being fitted into the large-diameter tubular portion 11A1. May be.

  Although the embodiments of the present invention have been described above, various alternatives, modifications or variations are possible for those skilled in the art based on the above description, and the present invention includes the various alternatives described above without departing from the spirit of the invention. Modifications and variations are included.

1 aquatic plant removing device 2 air supply source 3 air supply hose 4 drawing device 5 guiding hose 6 spouting member 6A one part 6B the other part 6C spout 7 recovery device 10 vertical tube part 11 horizontal tube part 11K suction port 12 air Supply cylinder 16 Communication port 17 Water outflow member 25 Collection net DI Worker who dives and weeds ES ES Sediment FP Water flow path LB Lake bottom UP Air rise passage WA Water WB Work boat WP Water grass

Claims (7)

  In an aquatic plant removing device for removing aquatic plants growing on the bottom of a lake, an air supply source for supplying compressed air and compressed air from this air supply source are supplied via an air supply hose to utilize this air pressure. And a hose for guiding the portion of the aquatic plant near the root of the aquatic plant from the soil in the bottom by sucking the part near the root of the aquatic plant in the horizontal direction from the suction port, and the hose for guiding the aquatic plant extracted by the withdrawing device upward from the water of the lake and marshes. And a recovery device including a spout member attached to the upper end of the guide hose, and a recovery net for recovering the aquatic plants that have been spouted together with water from the spout of the spout member. An aquatic plant removal device.   A vertical cylinder part having a hollow cylindrical shape extending in the vertical direction and having an upper end connected to the guide hose, and one end of which is perpendicular to the lower part of the vertical cylinder part and the other end of which is connected to the vertical hose. From a horizontal tube portion having a suction port opened in the horizontal direction, and an air supply tube portion having one end connected to the air supply hose and the other end connected to a side surface at an intermediate position in the vertical direction of the vertical tube portion. The aquatic plant removal device according to claim 1, which is configured.   When removing the aquatic plants, when the lower end of the horizontal tubular portion of the extraction device is grounded to the bottom of the lake, the suction port of the horizontal tubular portion is located at a position away from the bottom of the lake. The aquatic plant according to claim 2, wherein the structure is arranged so that a portion of the aquatic plant near the root of the aquatic plant is sucked from the suction port in the horizontal direction so that the stem is bent while being pulled out. Removal device.   The aquatic plant removing device according to claim 2, wherein as the horizontal tubular portion, a suction tubular portion of a different type is detachably provided on a tubular portion forming a part thereof.   When compressed air from the air supply source is supplied from the communication port of the air supply cylinder into the vertical cylinder, the compressed air from the air supply source is provided between the inner surface of the side wall of the vertical cylinder over the entire outer circumference thereof. The water outflow member according to claim 1, wherein a water outflow member that forms an air rising passage and forms a flow path of water sucked from the suction port of the horizontal tubular portion is provided in the vertical tubular portion. apparatus.   The spouting member has a hollow cylindrical shape with an L-shaped outer shape, extends in a direction in which the guiding hose is extended as it is, and has a lower end portion connected to the guiding hose. The aquatic plant removing device according to claim 1, wherein the one part is formed by bending the one part so as to be orthogonal to the other part and the other part is formed with the spout at the end part. In the method of removing aquatic plants that grows on the bottom of lakes,
Compressed air is supplied from an air supply source through an air supply hose, and by using this air pressure, the portion of the aquatic plant near the root of the aquatic plant stem is sucked in from the horizontal direction through the suction port of the drawing device. Pull out from the bottom sediment,
Guide the extracted water plants upward from the water of the lake through the guide hose,
A method of removing aquatic plants, characterized in that the aquatic plants that have been poured out together with water from a pouring outlet of a pouring member attached to the upper end of the guide hose are collected by a collecting net.

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