JP2012092561A - Water bottom leveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water bottom leveling device capable of accurately and highly efficiently leveling a rugged water bottom while fixing a depth in the sea, a river, a lake or a dam, etc.SOLUTION: The water bottom leveling device includes: a pair of upper and lower hull side hinge parts respectively provided on support frames on both left and right sides of a hull; a pair of upper and lower rigid arms respectively arranged on both left and right sides of the hull, supported at one end so as to be freely turned by the pair of upper and lower hull side hinge parts and supported at the other end so as to be freely swung in a circular arcuate shape with the respective hull side hinge parts as fulcrums; an earth removal plate arranged in a hull transverse direction and arranged such that the distal end part is at a prescribed angle suitable for the leveling operation of the water bottom to a horizontal plane; a pair of upper and lower side earth removal plate side hinge parts provided on both left and right sides of the earth removal plate, for supporting the earth removal plate so as to be turned by the other end each of each rigid arm; and a winch mechanism arranged at the hull, for adjusting the underwater height position of the earth removal plate.

Description

  In the sea, river, lake, dam, etc., in the situation where the bottom of the water is uneven after excavation using a grab bucket during dredging work, It is related with the water bottom leveling apparatus which can ensure the depth of a water bottom, without generating extra dredged soil by leveling.

  Conventionally, in dredging work on the seabed, including the finishing stage of dredging, from the grab dredger as shown in FIG. Drilling was taking place. In this case, the excavated earth and sand were lifted on the surface of the water, transferred to an earth ship, etc., and transported and dumped to a predetermined disposal site. When the seabed is excavated using such a grab bucket, the entire cross section of the bottom of the seabed A has an arc shape as shown in FIG. 8B, that is, the tip of the grab when the grab is closed. The part that hits is deep, but the other part is shallow. Therefore, in conventional dredging work, a method of excavating somewhat deeply in consideration of work accuracy is generally performed, and the shallow convex portion (see A1 in FIG. 8 (b)) after excavation has a design water depth P ( The target water depth (for example, -10.0 m) is set to be deeper than the design water depth P by a predetermined distance, and the drilling (for deep digging) is aimed at P ′ (for example, −10.2 m). (Refer to Fig. 8 (b)), even though the water depth of the convex part sufficiently satisfies the requirement, the concave part has a deeper water depth than necessary, and the dredged soil greatly exceeds the theoretically required amount of dredged soil. Therefore, it has been an issue to be improved from the viewpoint of the global environment, such as squeezing the capacity of the sea surface disposal site constructed by reclaiming the sea surface.

  In addition, as another method of dredging work on the seabed, a dredging system having a drainage plate, excavated soil pressure feeding means, depth adjusting function of the excavating means, and storage means on the surface of the water is used. It has been devised to excavate the uneven water bottom by moving the earth excavation board that has been settled to a predetermined depth, level the water bottom at the same time, and lift the excavated earth and sand on the ship.

  FIG. 9 shows such a conventional seabed leveling device, which is disclosed in Patent Document 1. In FIG. The main structure of the conventional seabed leveling apparatus shown in FIG. 9 will be described. S is a work ship moved by tugboats 21 and 22, W1 and W2 are a sand collection cylinder 25 and a soil discharge described later from the work ship S. A winch mechanism (suspension means) for raising and lowering the plate 26, 25 is a sediment collection cylinder set on the sea bottom by the winch mechanisms (suspension means) W1 and W2 and the swing frame 28 described later from the work ship S. , 26 are each a substantially rectangular planar discharge plate attached to the left and right sides of the earth and sand collecting cylinder 25 so as to be rotatable around a horizontal axis (pivot portion 4P; see FIG. 9 (d)), and 27 is the earth and sand A hydraulic cylinder (see FIG. 9 (c)) for connecting between the movable support 24 fixed to the collecting cylinder 25 and each of the earth discharge plates 26, 28 is pivotally supported at the base of the work ship S. And each free end of the base is used as a fulcrum. A swing frame (for adjusting the depth positions of the earth and sand collecting cylinder 25 and the earth discharging plate 26), which is swingable up and down in an arc shape and whose free ends are fixed to the earth and sand collecting cylinder 25. , 29 is a tube with a screw conveyor for continuously pumping the earth and sand collected by the earth and sand collecting cylinder 25 to the earth transport ship B (which advances along the water surface together with the work ship S). In the conventional seabed leveling apparatus shown in FIG. 9, the earth and sand collecting cylinder 25 collects the earth and sand that has been leveled and scraped by the right and left earth discharge plates 26 in itself. The collected earth and sand are continuously pumped to the sea transport ship B by the tube 29 with screw conveyor.

  Further, in the conventional seabed leveling apparatus shown in FIG. 9, each of the soil discharge plates 26 is not changed as it is because the water depth of the soil collection tube 25 and each of the soil discharge plates 26 can be changed every dredging operation. It is not always possible to set an appropriate angle for all dredging operations. Therefore, in the conventional seabed leveling apparatus shown in FIG. 9, each earth discharging plate 26 is rotatable with respect to a horizontal axis (pivot portion 4P; see FIG. 9 (d)) and the earth and sand collecting cylinder. 25 (moving support 24 fixed to the earth and sand collecting cylinder 25) and the respective earth discharging plates 26 are connected by hydraulic cylinders 27 (see FIG. 9C), and the seabed ground of the earth discharging plates 26 is connected. The biting angle with respect to (horizontal plane) was adjusted.

JP 2007-23694 A

  As described above, in the conventional seabed leveling device shown in FIG. 9, each of the soil discharge plates 26 is operated by the swing frame 28 so as to correspond to the design water depth that differs for each dredging operation. Since the base portion of S is moved up and down in an arc shape with the fulcrum as a fulcrum, depending on the angle moved up and down in the arc shape when it sinks according to the design water depth, its tip portion is relative to the horizontal plane (sea bottom) There was a problem that the angle was not appropriate for leveling work. Therefore, in this conventional seabed leveling device, in order to make the biting angle with respect to the horizontal plane (bottom surface) of the tip of the soil removal plate 26 appropriate, the earth and sand collection supporting the soil removal plate 26 is performed. The hydraulic cylinder 27 is interposed between the cylinder 25 side (moving support plate 24) and the soil discharge plate 26, and the hydraulic cylinder 27 is operated for each dredging operation so that the angle of the soil discharge plate 26 is increased. Was adjusted to correspond to the design water depth for each dredging operation.

  However, in the conventional seabed leveling apparatus shown in FIG. 9, it is not suitable for the main purpose of the present application to generate dredged sand accompanying work, and there are the following problems regarding the leveling function. That is, in the conventional seabed leveling apparatus shown in FIG. 9, when the seabed is leveled using the seabed leveling apparatus including the earthing plate 26 mounted on a work boat, the earthing is performed as described above. In order to adjust the angle of the tip of the plate 26 so as to correspond to the design depth that differs for each dredging operation, it was necessary to provide the hydraulic cylinder 27 and a hydraulic hose (not shown). However, when excavating, hydraulic oil is likely to leak due to collision of sand and gravel mixed soil and wear and tear of the seal part, and it is easy to cause marine pollution accidents. . In addition, when performing leveling work on the channel, it is necessary to move the work ship promptly (navigation) after each leveling so as not to obstruct the passing ship. However, in the conventional submarine leveling device shown in FIG. 9, in the conventional seabed leveling device, the swing frame 28, Since there are many items to be controlled and confirmed such as the suspension means W1 and W2 and the hydraulic cylinder 27, it is difficult to perform the above repetitive operation efficiently. Further, in the conventional seabed leveling apparatus shown in FIG. 9, the earth discharge plate 26 has a complicated structure in which it is indirectly coupled via the movable support 24, the earth and sand collecting cylinder 25, etc. Compared with the structure directly coupled to the swing frame 28, the propulsive force such as the tugboat 22 could not be efficiently used as the excavating force.

  The present invention has been made paying attention to such problems of the prior art, and the leveling of the bottom of the undulation after excavation is performed accurately and efficiently while suppressing the generation of excess dredged soil. It is an object of the present invention to provide a water bottom leveling apparatus that can be used for the following.

  The water bottom leveling device for leveling the uneven water bottom according to the present invention for solving the problems of the prior art includes a support frame fixed to each of the left and right sides of the hull on the water, and the support frames. A pair of upper and lower hull-side hinges provided at two positions separated from each other by a predetermined distance in the direction of gravity, and left and right sides of the water-borne hull, respectively, and one end of each pair of the upper and lower hulls. Each other end is supported by a side hinge so as to be pivotable, so that each other end is swingably supported in an arc shape with each hull side hinge as a fulcrum. A pair of upper and lower rigid arms arranged parallel to each other in the gravitational direction, and a hull lateral direction (a direction orthogonal to the traveling direction) are connected to the left and right rigid arms, respectively. And at least both ends of the earth removing plate disposed at a predetermined angle suitable for leveling operation of the water bottom with respect to a horizontal plane, and both ends (both left and right sides) of the earth removing plate, A pair of upper and lower earth discharges disposed at two locations separated from each other by a predetermined distance in the direction of gravity, and for allowing the earth removal plates to be rotatably supported by the other ends of the rigid arms. By placing the wire on the plate side hinge part and the left and right sides of the hull, one end of which is fixed to the rigid arm or the earth discharging board into the water for a required length, And a winch mechanism for adjusting the height position in water.

  Further, in the water bottom leveling apparatus according to the present invention, the hull does not include a propulsion engine that moves the hull, and the hull of a non-self-propelled ship that moves by being pushed or pulled by a self-propelled ship equipped with the propulsion engine. And a screw for facilitating movement in a lateral or oblique lateral direction with respect to the traveling direction of the bow portion on the bow portion on the traveling direction side (the right direction in FIG. 1A) of the hull. It is desirable to provide a side thruster (lateral movement device; reference numeral 20 in FIG. 1A) and a sounding instrument (reference numeral 21 in FIG. 1A) that measures the bottom water depth in real time. .

  In the present invention, the left and right sides of the earth discharging plate are supported so as to be swingable in a circular arc shape with the hull side as a fulcrum by respective rigid arms that are submerged in water from the left and right sides of the hull. Moreover, in the present invention, the rigid arms on the left and right sides are each a biaxial shaft composed of two arms of the same length arranged in a pair of upper and lower sides so as to be separated from each other by a predetermined distance in the direction of gravity and parallel to each other. Each rigid arm has a hull-side end portion of each hull-side support frame, and each rigid arm's underwater-side end portion has an underwater plate. Each hull-side hinge is supported by each earthing plate-side hinge, and the vertical distance between each hull-side hinge and each earthing-plate-side hinge is the same length. Each end of the rigid arm is always held so that the straight line connecting the rigid arm and the earth discharging plate at any depth is in the direction of gravity. Become. Therefore, according to the present invention, regardless of the depth of the rigid arm and the soil discharge plate in water, the soil discharge plate supported by each rigid arm or the tip portion thereof is always supported. The angle with respect to the horizontal plane is maintained at a constant angle suitable for the leveling operation of the bottom of the water (the operation of scraping off the raised ridges of the bottom of the water and moving the shaved earth and sand to a nearby recess).

  Therefore, according to the present invention, “the angle of the earth discharging plate or its tip is required for each dredging operation to correspond to the design water depth of each dredging operation, which is required in the conventional water bottom leveling device. No need for “hydraulic cylinder for adjustment”, so it is possible to prevent marine pollution due to oil, and “complicated work of adjusting the angle of the drainage plate by operating the hydraulic cylinder” at the time of the leveling work is not required. Therefore, the leveling operation of the bottom surface of the water surface that has become uneven after excavation can be performed accurately and efficiently without generating excess dredged soil by using the earth discharging plate.

  Furthermore, in a moat by excavation using a conventional grab with a round-bottom claw, a convex portion (remaining portion) and a concave portion (deep moat portion) are formed next to each other. Since the earth and sand that has been shaved off at a predetermined depth from the convex part (remaining part) of the ruins by a conventional round bottom claw grab can be moved directly to the next recessed part, the shaved earth and sand can be moved from the sea floor to the ship. This eliminates the need to make new dredged soil.

  Further, in the present invention, the hull does not have a propulsion engine that moves itself, but is a non-self-propelled ship that moves on or under water by being pushed or pulled by another self-propelled ship equipped with the propulsion engine. Since it is configured by the hull, non-self-propelled ships are extremely advantageous in terms of maintenance and operation because marine regulations such as the Ship Safety Act are not applied unlike self-propelled ships. In addition, even when the hull is a non-self-propelled ship, it is possible to move the tip portion in the direction of the hull movement direction (moving laterally or obliquely laterally with respect to the traveling direction). When a side thruster composed of a screw or the like and a sounding instrument are provided, the progress of the hull can be controlled easily and accurately.

(A) is a conceptual diagram for demonstrating the seabed leveling apparatus by Example 1 of this invention (The side thruster 20 and the sounding instrument 21 are related to Example 2). (B) is the schematic which shows the earth discharging board of the present Example 1. FIG. (C) is a perspective view of the earth discharging plate. (D) is a top view which shows the state which carries out the forward work of the work ship which suspended this apparatus on the water bottom by self-propulsion ship (push ship type). It is a side view which shows the earth discharging board of the present Example 1. It is a schematic side view for explaining the first embodiment. 1 is a schematic plan view for explaining the first embodiment. It is the schematic for demonstrating operation | movement of the rigid arm and the earth-removing board of the present Example 1. It is a conceptual diagram for demonstrating operation | movement of the rigid arm of this Example 1, and a soil discharging board. It is a figure for demonstrating operation | movement of the present Example 1. FIG. It is a figure for demonstrating the dredging work of the seabed by the conventional grab dredger. It is a figure for demonstrating the dredging work system containing the conventional earth discharging board.

  The best mode for carrying out the present invention is a mode as described in Example 1 below.

  FIG. 1 (a) is a conceptual diagram for explaining a seabed leveling apparatus according to Embodiment 1 of the present invention, FIG. 1 (b) is a schematic diagram showing a soil discharge board according to Embodiment 1, and FIG. FIG. 1 (d) is a plan view showing a state in which a work ship suspended from the bottom of the water is advanced by a self-propelled ship (push ship type), and FIG. FIG. 3 is a schematic side view for explaining the first embodiment, and FIG. 4 is a schematic plan view for explaining the first embodiment.

  1 (a), 3 and 4, 1 is a hull of a non-self-propelled trolley, 2 is a steel support frame fixed to the hull 1, and 3a and 3b each have an upper end described above. A pair of upper and lower steel rigid arms 3c supported by the support frame 2 in a swingable manner are provided at a plurality of locations of the rigid arms 3a and 3b, and the rigid arms 3a and 3b are bent and are separated too much from each other. Intermediate support rods for connecting and supporting each other so as not to be present (in FIG. 3, the rigid arms 3a and 3b are shown in three locations, but in FIG. 1A, the rigid arms 3a and 3b are shown for convenience of illustration. 4 is a steel earth-moving plate rotatably supported at the lower end portions (free ends) of the rigid arms 3a and 3b, and 5 is the rigidity of the rigid arms 3a and 3b. The wire 6 for adjusting the depth of the swing position of the arms 3a and 3b is a desired length. Lifting winch for feeding out in the sea, 7 押船 pressing this hull 1, A is uneven sea bottom to be working leveling according to this embodiment 1, A1 is a convex portion of the uneven seabed A.

  In addition, in FIGS. 1 to 4, 4 is a soil discharge plate, 4 a is a main body of the soil discharge plate 4, and 4 b is a plate-like shape fixed to the front end side (the traveling direction side of the hull) of the main body 4 a of the soil discharge plate 4. Tip part (excavation part for excavating earth and sand of the convex part A1 of the uneven sea bottom A) 4c is a claw part fixed to the lower end in the figure of the tip part 4b, 4d is connected to the left and right ends of the main body 4a The connected plate 4da is a part of the connecting plate 4d and reinforces and supports the plate-like tip portion 4b from the opposite side of the ship moving direction, and 11a and 11b are attached to the rigid arms 3a and 3b. A pair of upper and lower earthing plate side hinges provided on the connecting plate 4d for rotatably connecting the main body 4a of the earthing plate 4. FIG. 1C shows the main body 4 a of the earth discharging plate 4 in a perspective view, but the length of the main body 4 a is changed according to the lateral length of the hull 1.

  In FIG. 3, 12 a and 12 b are hull-side hinges provided on the support frame 2, and 13 is provided on the hull 1, and the rigid arms 3 a and 3 b of the wire 6 from the lifting winch 5. It is a davit provided to keep the direction extending to the side constant.

  In the first embodiment, as shown in FIG. 4, the support frame 2, the lifting winch 5, and the davit 13 are arranged in a pair on the left and right sides of the hull 1. In FIG. 4, 14 is a control room, and 15 is an existing hold space when an earth ship is used as a carriage.

  Further, in the first embodiment, as shown in FIG. 3, the hull-side hinge portions 12 a and 12 b are provided at two locations separated by a predetermined distance B (for example, 1200 mm) along the direction of gravity of the support frame 2. Each is provided. Further, the soil discharge plate side hinges 11a and 11b are also provided at two locations separated from each other by the same predetermined distance B (for example, 1200 mm) along the direction of gravity of the main body 4a of the soil discharge plate 4, respectively. ing. Accordingly, in the first embodiment, the rigid arms 3a and 3b are formed to have the same length, and both ends thereof are the hull side hinge portions 12a and 12b and the earth discharging plate side hinge portion 11a, respectively. , 11b are supported so as to be rotatable, so that they always swing in parallel with each other. In order to increase the rigidity of the rigid arms 3a and 3b, support rods that connect each other may be arranged at a plurality of positions in the middle of the rigid arms 3a and 3b by hinge coupling.

That is, as shown in FIG. 5, in the first embodiment, the pair of upper and lower rigid arms 3a and 3b always swings in parallel with each other, and each of the pair of upper and lower rigid arms 3a and 3b on the hull 1 side. The end portions (the portions that are pivotally connected to the hull-side hinge portions 12a and 12b) are always arranged and held so that the straight line connecting them is in the direction of gravity. Also, each end of the pair of upper and lower rigid arms 3a, 3b on the earth discharging plate 4 side (each part rotatably connected to the earth discharging plate side hinges 11a, 11b) is always They are placed and held so that the straight line connecting them is in the direction of gravity. Therefore, in the present Example 1, how the height position in the sea of the said earth removal board 4 is fluctuate | varied corresponding to the design water depth P (refer FIG.8 (b)) which differs for every dredging operation | work. In addition, the angles of the tip portion 4b and the claw portion 4c of the earth discharging plate 4 with respect to the horizontal plane (sea bottom) are always kept constant (see also FIG. 6). 5 and 6, the intermediate support bar 3c is not shown for convenience.
FIG. 7 is a diagram for explaining finishing work after excavation using the first embodiment. In the submarine dredging operation, first, as shown in FIG. 7 (a), as shown in FIG. 7 (a), a grab bucket is submerged from the well-known grab dredger into the sea to excavate the sea bottom A. In this case, The bottom of the sea after excavating with the bucket is an uneven sea bottom A as shown in FIG. 7A because the bottom of the grab bucket is formed in a substantially arc shape. As a point, finishing by “deep digging” as described above with reference to FIG. 8B is not performed, and most of the convex portion A1 of the uneven sea bottom A is the design water depth P (target water depth. For example, − The excavation is stopped at the same depth as 10.0m).

  Next, as step 2, using the seabed leveling apparatus according to the first embodiment, as shown in FIG. 7B, the convex portion A1 of the uneven sea bottom A (see FIG. 7A). ) Is smoothed by the earth discharging plate 4. In this case, in order to excavate somewhat deeply in consideration of the working accuracy, the height position of the claw portion 4c of the earth removing plate 4 is set to, for example, -10 slightly below the design water depth P (for example, -10.0 m). Perform leveling to 2 m (see symbol P ′ in FIG. 7B). Then, as shown in FIG. 7B, the convex portion A1 of the uneven sea bottom A is excavated, and the excavated soil moves to the adjacent concave portion (see reference A2 in FIG. 7B). A seabed deeper than the design water depth P which is the final purpose of dredging work can be obtained without generating excessive dredged soil.

  As described above, according to the first embodiment, the angle of the tip portion 4b and the claw portion 4c of the soil discharge plate 4 with respect to the horizontal plane is the height position of the soil discharge plate 4 in the sea Regardless of the design water depth P set every time). Therefore, when using the first embodiment, it is necessary to install a hydraulic cylinder to adjust the angle of the earth discharging plate as in the prior art, and to complicated the swing frame 28, the suspension means W1, W2, the hydraulic cylinder 27, etc. It is no longer necessary to adjust the angle of the earth removal plate by operating to the level, so when performing the leveling work on the uneven sea bottom after excavation, this leveling work is performed accurately and efficiently. It becomes possible.

  Next, a second embodiment of the present invention will be described. Since the basic configuration of the second embodiment is the same as that of the first embodiment, different portions will be mainly described. In the second embodiment, the bow portion is laterally or obliquely transverse to the traveling direction at the bow portion on the traveling direction side (right direction in FIG. 1A) of a hull 1 of a non-self-propelled ship. A side thruster 20 (lateral movement device) configured by a screw or the like for moving to the sea and a sounding instrument 21 for measuring the seabed water depth in real time are provided (see FIG. 1A). The configurations of the side thruster 20 and the sounding instrument 21 are well known in the art and will not be described.

  Conventionally, a trolley (or its hull 1) that is pushed and moved by a push boat has been very difficult to control its position when subjected to strong winds and tides from the side, as in the second embodiment. When the side thruster 20 is provided at the bow of the trolley, it becomes very easy to ensure the fine position of the hull 1 of the trolley. Further, since the position and height of the convex portion of the water bottom before leveling are accurately grasped by the sounding instrument 21, leveling can be performed more appropriately.

  As mentioned above, although each Example of this invention was described, this invention is not limited to what was described as each said Example, A various correction and change are possible. For example, the seabed leveling device according to the first embodiment has been described as being used for finishing excavation with a constant depth by leveling the convex portions of the seabed that are uneven after excavation of the seabed. The present invention is not limited to this. For example, in addition to rivers, lakes, dams, sand waves (deposition of wavy seabed sediment), thin ridges that cannot be deeply drilled, and irregularities scattered in a wide range. Of course, it can also be used to flatten the bottom of the water. Further, in the present invention, an inclined plate (its side surface (at least its top portion) is inclined at one or a plurality of locations of each of the rigid arms 3a, 3b or the earth discharging plate 4 in the direction opposite to the traveling direction of the hull 1. ) May be provided with an inclined plate (not shown) arranged and fixed so as to be inclined in the direction opposite to the traveling direction of the hull 1. When each of the rigid arms 3a, 3b or the earth discharging plate 4 moves underwater as the hull 1 moves, the inclined plate receives a component force in the direction of gravity due to the resistance of the water. 3b or the earth removal plate 4 also receives a force in the direction of gravity, so that the buoyancy of water applied to the rigid arms 3a and 3b or the earth removal plate 4 (especially the rigid arms 3a and 3b or the earth discharge The body 4a of the plate 4 is tubular In addition, when it is formed in a hollow body, a large buoyancy is applied to each of the rigid arms 3a, 3b or the drainage plate 4, so that the drainage plate 4 is placed on the bottom surface depending on the balance between the weight of the apparatus and the buoyancy. On the other hand, it may be difficult to move while sufficiently pressing in the gravitational direction), and the earth removal plate 4 is moved while being sufficiently pressed against the water bottom in the gravitational direction. As a result, the raised ridges on the bottom surface of the water are surely scraped off by the earth discharging plate 4.

DESCRIPTION OF SYMBOLS 1 Hull 2 Support frame 3a, 3b Rigid arm 3c Intermediate support bar 4 Drainage board 4a Main body 4b Tip part 4c Claw part 4d Connection board 5 Lift winch 6 Wires 11a, 11b Drainage board side hinge part 12a, 12b Hull side hinge part 13 Davit 20 Side thruster 21 Sounder A Uneven sea bottom A1 Convex part A2 Earth and sand P moved to the concavity Design depth

  The water bottom leveling device for leveling the uneven water bottom according to the present invention for solving the problems of the prior art includes a support frame fixed to each of the left and right sides of the hull on the water, and the support frames. A pair of upper and lower hull-side hinges provided at two positions separated from each other by a predetermined distance in the direction of gravity, and left and right sides of the water-borne hull, respectively, and one end of each pair of the upper and lower hulls. Each other end is supported by a side hinge so as to be pivotable, so that each other end is swingably supported in an arc shape with each hull side hinge as a fulcrum. A pair of upper and lower rigid arms arranged parallel to each other in the gravitational direction, and a hull lateral direction (a direction orthogonal to the traveling direction) are connected to the left and right rigid arms, respectively. And at least both ends of the earth removing plate disposed at a predetermined angle suitable for leveling operation of the water bottom with respect to a horizontal plane, and both ends (both left and right sides) of the earth removing plate, A pair of upper and lower earth discharges disposed at two locations separated from each other by a predetermined distance in the direction of gravity, and for allowing the earth removal plates to be rotatably supported by the other ends of the rigid arms. By placing the wire on the plate side hinge part and the left and right sides of the hull, one end of which is fixed to the rigid arm or the earth discharging board into the water for a required length, A winch mechanism for adjusting the height position in water, and each rigid arm or the earth discharging plate is fixed to one or a plurality of places, and each rigid arm or the earth discharging plate advances the hull. Move underwater in the direction An inclined plate fixed in a direction to receive a component force toward the gravitational direction by the resistance of the water can is characterized in that it comprises a.

In the present invention, the left and right sides of the earth discharging plate are supported so as to be swingable in a circular arc shape with the hull side as a fulcrum by respective rigid arms that are submerged in water from the left and right sides of the hull. Moreover, in the present invention, the rigid arms on the left and right sides are each a biaxial shaft composed of two arms of the same length arranged in a pair of upper and lower sides so as to be separated from each other by a predetermined distance in the direction of gravity and parallel to each other. Each rigid arm has a hull-side end portion of each hull-side support frame, and each rigid arm's underwater-side end portion has an underwater plate. Each hull-side hinge is supported by each earthing plate-side hinge, and the vertical distance between each hull-side hinge and each earthing-plate-side hinge is the same length. Each end of the rigid arm is always held so that the straight line connecting the rigid arm and the earth discharging plate at any depth is in the direction of gravity. Become. Therefore, according to the present invention, regardless of the depth of the rigid arm and the soil discharge plate in water, the soil discharge plate supported by each rigid arm or the tip portion thereof is always supported. The angle with respect to the horizontal plane is maintained at a constant angle suitable for the leveling operation of the bottom of the water (the operation of scraping off the raised ridges of the bottom of the water and moving the shaved earth and sand to a nearby recess).
Moreover, in this invention, it is the inclination board fixed to one place or multiple places of each said rigid arm or the said earth discharging board, Comprising: Each said rigid arm or the said earth discharging board carries out underwater in the advancing direction of the said hull. Since it is provided with an inclined plate that is fixed in such a direction as to receive a component force in the direction of gravity due to the resistance of water when moving, each of the rigid arms or the earth discharging plate moves underwater as the hull advances. When the inclined plate receives a component force in the direction of gravity due to the resistance of water, the soil discharge plate is moved while being securely pressed against the bottom surface of the water in the direction of gravity. (2) When there is no such inclined plate, the rigid arm or the main body of the earthing plate is in the shape of a tube or a hollow body. Formed into In such a case, a large buoyancy is generated in each rigid arm or the earth discharging plate, so depending on the balance between the weight of the device and the buoyancy, the earth moving plate is moved while being securely pressed against the water bottom in the direction of gravity. There is a risk of not being able to do it).

Claims (2)

A support frame fixed to each of the left and right sides of the hull on the water,
A pair of upper and lower hull-side hinges provided at two locations of the support frames that are separated from each other by a predetermined distance in the direction of gravity;
It is arranged on each of the left and right sides of the hull on the water, and each one end is rotatably supported by the pair of upper and lower hull side hinges, so that each other end is a circle with each hull side hinge as a fulcrum. A pair of upper and lower rigid arms supported in an arc shape so as to be swingable, and formed in the same length to each other and arranged in parallel to each other through a predetermined distance in the direction of gravity;
It is arranged in a direction orthogonal to the traveling direction of the hull, and is connected to the other end of each of the left and right rigid arms, so that at least its tip end is at a predetermined angle suitable for leveling the bottom of the water with respect to the horizontal plane. An earth plate disposed in the
Parallel to each other through a predetermined distance in the direction of gravity, which are provided at both ends of the soil discharge plate, respectively, so that the soil discharge plate is rotatably supported by the other end of each rigid arm. A pair of upper and lower earth removal plate-side hinges arranged in
The height position of the earth discharging plate in water by placing the wire, which is arranged on each of the left and right sides of the hull, one end of which is fixed to the rigid arm or the earth discharging plate, into the water for a required length. A winch mechanism for adjusting
A water bottom leveling device characterized by comprising: In claim 1,
The hull is not equipped with a propulsion engine that moves itself, and is a hull of a non-self-propelled ship that moves by being pushed or pulled by a self-propelled ship equipped with a propulsion engine,
On the bow portion on the traveling direction side of the hull, a side thruster (lateral movement device) constituted by a screw or the like for facilitating movement in a lateral or oblique lateral direction with respect to the traveling direction of the bow portion and a water bottom A water leveling device, characterized in that a depth sounder that measures water depth in real time is provided.

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