JP2020002601A - Dredging station and dredging system - Google Patents

Abstract

To provide a dredging station and a dredging system capable of efficiently drilling and dredging sediment at the bottom of a dam lake.SOLUTION: A dredging station 50 includes: a dredging unit 52 capable of walking on the bottom of dam lake; twin screw crushers 10, 20 that are provided to a platform 51 of the dredging unit 52 slidable in vertical and horizontal directions; and a dredge pump 30 disposed above the twin screw crushers 10, 20. With this, even on the rugged lake floor, the twin screw crushers 10, 20 can be moved correctly following the shape of the lake bottom.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dredging technique for dredging sediment deposited on the bottom of a dam lake.

In general dams, dredging work is required to discharge sediment such as mud, sediment, cobblestones, gravels, and debris deposited on the bottom of the dam lake in order to maintain the dam's water storage capacity. In particular, in the case of a dam for hydroelectric power generation, sediment near the intake becomes a problem, and dredging near the intake is carried out in a timely manner.
Conventional dam dredging methods include a grab bucket that seizes and lifts sediment at the bottom of the lake, and a dredging method that uses a grab boat loaded on an earth transport vessel or a pump that sucks sediment at the bottom of the lake and pumps mud with a dredging pump. A dredging method using a dredger is known.
In these dam dredging methods, since dredging work with a grab ship or pump dredger requires workers with special skills, securing workers and passing on the skills is a problem. In addition, there is a problem that every time the dredging work is performed, the dredging equipment including the dredging work boat must be transported on land and placed on the dam lake.

  For this reason, for example, in Patent Document 1, a buoyant body movably formed on the water, a base machine traveling and moving along a track laid on the buoyant body, and an ascent / descent from the base machine to the bottom of the water A dredging system has been proposed that includes a horizontal multi-axis cutter that hangs down and excavates sediment, and a pump that sucks and discharges sediment excavated by the horizontal multi-axis cutter. .

JP 2007-146481 A

However, the dredging system described in Patent Literature 1 has a structure in which sediments are excavated by a horizontal multi-axis cutter suspended from the bottom of a watercraft from a base machine running and moving along a track laid on a buoyant body.
Therefore, when moving the horizontal multi-axis cutter following the shape of the lake bottom on the rugged lake bottom, the wire is wound by the winch mounted on the buoyancy body, and the track is laid on the buoyancy body. There is a problem that an interlocking operation with the traveling movement of the traveling base machine is required, and the operation itself is difficult.

In addition, in the excavation work using a horizontal multi-axis cutter, the suspension of lake water occurs. However, it is difficult to confirm the shape of the suspended lake surface from above the water. Therefore, the operation of following the shape of the lake bottom of the horizontal multi-axis cutter while the shape of the lake bottom cannot be confirmed. Therefore, the arrangement of the horizontal multi-axis cutter on the bottom of the lake becomes inaccurate, and there is a problem that it is difficult to efficiently excavate sediment such as gravel and deciduous trees on the bottom of the lake while dredging.
Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a dredging station and a dredging system capable of efficiently excavating sediment at the bottom of a dam lake while dredging. I do.

  In order to solve the above problems, a dredging station according to one embodiment of the present invention includes a dredge yakura erected on the bottom of a dam lake, and a crusher mounted on the dredge yakura so as to be able to slide vertically and horizontally. And a dredge pump installed on top of the crusher, wherein the dredge arrow is provided with a platform and a horizontal plane capable of moving the platform in at least one of an X direction and a Y direction orthogonal to each other in a horizontal plane. A moving mechanism, and a plurality of supporting legs configured to be individually slidable in the Z direction via the vertical moving mechanism on the platform so that each supporting leg is settled on the bottom of a dam lake. It is characterized.

  According to the dredging station according to one aspect of the present invention, the dredge yakura is erected on the bottom of the dam lake with a plurality of support legs, and the crusher is installed on the dredge yakura so as to be able to slide vertically and horizontally. Since the dredging pump is installed at the upper part, the crusher can be moved accurately following the shape of the lake bottom even on a rough bottom. Therefore, the sediment at the bottom of the lake can be efficiently crushed (excavated) and dredged with a dredging pump.

  Here, in the dredging station according to one aspect of the present invention, the crusher is configured of two twin-screw crushers each having a pair of drum cutters arranged in upper and lower two stages, and an upper-stage two-shaft crusher. The crusher is provided with a pair of drum cutters at positions opposed to the suction side of the dredging pump, and the lower twin-screw crusher is provided with a pair of drum cutters of the upper twin-screw crusher. It is preferable that a pair of drum cutters is provided on the side opposite to the suction side.

  With such a configuration, even if the sediment contains cobblestones or deciduous trees, it is installed by a crushing process using a two-stage twin-screw crusher, compared to crushing using only one crusher. The sediment can be crushed more reliably to a size that can be sucked and discharged by the dredging pump. Therefore, it is more suitable as a configuration in which the sediment at the lake bottom is efficiently crushed and dredged by the dredging pump.

  In order to solve the above problems, a dredging system according to an aspect of the present invention includes a dredging station according to any one of the aspects of the present invention, and a floating station provided on water of a dam lake, The platform of the dredging station is connected to the floating station via a wire wound around a working machine attached to the floating station.

According to the dredging system according to an aspect of the present invention, the platform of the dredging station is connected to the floating station via a wire wound around a work machine attached to the floating station provided on the water of the dam lake. Therefore, regardless of the shape of the lake bottom, the dredging station can be surely prevented from overturning. Therefore, the sediment at the lake bottom can be dredged by the dredging pump while efficiently crushing.
Here, in the dredging system described in Patent Document 1, it is necessary to lay a track on the buoyant body, so that the buoyant body also becomes large. In addition, the configuration of the device on the buoyant body becomes complicated, so that a large-scale and complicated installation work is required. Furthermore, when the dredging system described in the document is carried in, there is a problem that a working machine such as a large truck, a trailer, or a rough terrain crane is required according to the increase in size.

  On the other hand, in the dredging system according to one aspect of the present invention, the dredging station includes a floating body capable of sinking the dredging station by floating and injecting the dredging station on water, a thruster capable of propelling the dredging station, Having a water-borne station, a water-floating main body and a connection body detachably connected to each other, and a thruster mounted on the main body or the connection body and capable of propelling the water station. Preferably, said body portion and connector portion define a docking bay capable of receiving said dredging station above water when interconnected.

With such a configuration, the floating station is configured such that the main body portion and the connecting body portion are detachably connected to each other, and a docking bay capable of accommodating the dredging station is formed when the main body portion and the connecting body portion are connected to each other. If the unit and the connector unit are separated from each other, the size of the unit can be reduced at the time of transportation, and the configuration of the apparatus is simplified, so that the installation work is facilitated. Therefore, when loading and unloading the dredging system, loading and unloading can be performed without using a large rough terrain crane.
In addition, with such a configuration, the dredging station has a floating body capable of floating the dredging station on water and sinking the dredging station by pouring water, and a thruster capable of propelling the dredging station. Alternatively, the coupling unit is equipped with a thruster capable of propelling the floating station, so that no other arrangement device such as a tow boat on the water is required.

Further, in the dredging system according to one aspect of the present invention, the dredging station and the surface station each include a plurality of wheels for traveling and a traction unit provided on a surface orthogonal to an axle of the wheels. Is preferred.
With such a configuration, without using a large rough terrain crane, for example, a winch provided on a relatively small transport device such as a vehicle-mounted crane or a carrier car, using a slope to the lake surface, a dredging station And it is suitable for carrying out and carrying in by pulling the floating station with a wire or the like. Therefore, such a configuration makes it easier to assemble and carry-in the apparatus with a relatively small-sized transport device, and is preferable for adapting to a narrow road or a dam in a mountainous area with a tunnel.

  As described above, according to the present invention, the sediment at the bottom of the dam lake can be efficiently excavated and dredged.

It is a schematic explanatory view showing a first embodiment of a dredging system using a dredging station according to one aspect of the present invention. It is a typical explanatory view showing one embodiment of a dredging station concerning one mode of the present invention, and the figure (a) shows the top view at the time of dredging, and (b) shows the front view. 1 is a schematic perspective view illustrating an embodiment of a dredging station according to one aspect of the present invention. It is a schematic plan view of the platform which comprises the dredging station. It is a schematic front view of the platform which comprises the dredging station. It is a schematic plan view of the intermediate frame of a platform. It is a front view showing one embodiment of a dredging device equipped with a dredging station concerning one mode of the present invention. It is a side view showing one embodiment of a dredging device concerning one mode of the present invention. It is a schematic explanatory view showing a second embodiment of a dredging system using a dredging station equipped with a dredging device according to one aspect of the present invention, wherein FIG. 1A is a plan view of the dredging station, and FIG. It is a front view. It is a schematic explanatory view showing a second embodiment of the dredging system according to one aspect of the present invention, wherein FIG. 1 (a) is a plan view of the floating station, and FIG. 1 (b) is a front view. It is a schematic explanatory view showing a second embodiment of the dredging system according to one aspect of the present invention, FIG. (A) is a plan view showing a process of storing a dredging station in a docking bay of a floating station on a lake, (b) is a front view of the storing process. It is a typical explanatory view showing a second embodiment of a dredging system according to one aspect of the present invention, and FIG. 7A is a plan view showing a storage state where a dredging station is stored in a docking bay of a floating station on a lake. , (B) is a front view of the stored state. It is a schematic explanatory view showing a second embodiment of a dredging system according to one aspect of the present invention, wherein FIG. 7A shows a state where a dredging station is suspended from a docking bay of a floating station toward a lake bottom on a lake. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The present embodiment is an example of a dredging system that includes a dredging station that is erected on the bottom of a dam lake and excavates sediments to perform dredging, and a floating station that is disposed on the lake of the dam lake.
The drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the drawings include portions having different dimensional relationships and ratios. The embodiments described below exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material, shape, structure, and arrangement of component parts. The present invention is not specified in the following embodiments.

First, the overall configuration of the dredging system according to the first embodiment will be described.
As shown in FIG. 1, the dredging system has a floating station 1 arranged on a lake SL of a dam lake and a dredging station 50 arranged on a lake bottom SB of the dam lake. The dredging station 50 of the present embodiment is equipped with a dredging device 100 in which two twin-screw crushers 10 and 20 are configured in two upper and lower stages.
The dredging station 50 excavates the lake bottom of the dam lake with the two twin-screw crushers 10 and 20 mounted on the dredging device 100 on the bottom SB of the dam lake on which the sediment is deposited, and the biaxial crusher 10 , 20 are configured to be capable of dredging excavated sediment together with muddy water by a dredging pump 30 provided on the upper part of the sediment. And the dredging system of this embodiment moves the sediment dredged by the dredging device 100 from the arrangement position S of the dredging station 50 to the transfer position M on the lake bottom via the drainage hose 7 arranged underwater. It is configured as follows.

Specifically, in the example of the present embodiment, the floating station 1 is anchored at a target position on the lake SL. The floating station 1 of the present embodiment also serves as a placement mother ship for transporting (transferring underwater) the dredging station 50 in a state of being suspended from the lake SL, and erected on the lake bottom SB of the dam lake.
In addition, the dredging system of the first embodiment can transport the floating station 1 and the dredging station 50 to the lake shore leading to the dam lake by a vehicle such as a truck as a situation of the dam lake. This is an example assuming a use state in a situation where the product can be transported from a lake to a lake.

  The floating station 1 includes a working machine 6 including a winch and a crane for erection and placement of the dredging station 50 on the lake bottom SB of the dam lake, a generator 2, and a variable displacement type driven by an internal combustion engine as a hydraulic source. A hydraulic pump 3 and a management computer 9 constituting control means are provided. The floating station 1 transports the dredging station 50 to the predetermined position of the dam lake by towing or self-propelled on the water, and hangs down the dredging station 50 with the wire 5 of the work machine 6 and stands upright on the lake bottom SB of the dam lake.

The management computer 9, the generator 2 and the hydraulic pump 3 are connected to the dredging station 50 arranged on the bottom SB of the dam lake via the umbilical cable 8, and from the floating station 1 side, the dredging station 50 and the dredging device 100 are connected. It is possible to supply electric power and control signals necessary for operation and supply of pressure oil.
The umbilical cable 8 has a hybrid structure in which the supply and discharge hydraulic hoses, the power cable, and the signal cable are integrally surrounded and held by a flexible cable bear (the cable bear is a registered trademark). . In addition, each hydraulic hose for supply / discharge, the power cable, and the signal cable may be separately wired and piped.

Next, the dredging station 50 will be described in detail with reference to FIGS. The dredging station 50 is a self-propelled dredging machine for dredging bottom sediment of a dam lake, including the dredging device 100 and a dredging arrow 52 capable of self-propelling in the X and Y directions.
As shown in FIG. 2, the dredging station 50 according to the present embodiment includes a platform 51 having a plurality of rectangular frames, and a plurality (eight legs in this example) supporting four corners of upper and lower frames constituting the platform 51. The dredger 52 has a support leg 66 and a jack mechanism 69. Each support leg 66 is fixed to the platform 51 via a jack mechanism 69 so as to be able to move up and down.

The platform 51 constituting the dredging arrow 52 has an upper frame 51X having a rectangular frame shape in plan view, a lower frame (Lower frame) 51Y having a rectangular frame shape in plan view, and both platforms 51X, 51Y. And a middle frame (Middle frame) 51M that is provided in the middle of the frame and has a rectangular frame shape in plan view.
In this example, as shown in FIG. 3, two X moving frames 53 are stretched over the upper frame 51X along the Y direction. Both ends of each X moving frame 53 are respectively supported on the upper surface of the upper frame 51X via the X-direction moving mechanism 53X. The X-direction moving mechanism 53 has a motor, a deceleration mechanism, and a rack and pinion mechanism (not shown). By driving the rack and pinion mechanism via the deceleration mechanism with the motor, the two X-moving frames 53 are moved to the upper frame. It is slidable simultaneously in the X direction along 51X.

On the upper part of the two X moving frames 53, a Y moving frame 54 is placed so as to be stretched. The Y moving frame 54 is supported on the upper surface of the X moving frame 53 via the Y direction moving mechanism 54Y, and constitutes a Y direction feed mechanism of the dredging device 100. The Y-direction moving mechanism 54 has a motor, a deceleration mechanism, and a rack and pinion mechanism (not shown), and drives the rack and pinion mechanism via the deceleration mechanism with the motor, so that the dredging device 100 It is slidable along the extending direction (that is, along the Y direction).
In addition, the dredging device 100 is supported on the lower surface of the Y moving frame 54 so as to be able to move up and down via an elevating device 90 that constitutes a feed mechanism in the Z direction of the dredging device 100. It is placed in a suspended position.

The elevating device 90 includes a pair of left and right driving units 92 provided on the side of the Y moving frame 54, and an elevating rack 91 that is vertically erected in each of the driving units 92. . The drive unit 92 has a motor and a speed reduction mechanism (not shown), and a rack and pinion mechanism meshing with the lifting / lowering rack 91. The motor drives the rack and pinion mechanism via the speed reduction mechanism, so that the dredging device 100 is driven. It is slidable along the lifting rack 91 (that is, along the Z direction).
Further, a control unit 60 is provided above the Y movement frame 54. The umbilical cable 8 is connected to the control unit 60.

As shown in FIG. 3, the control unit 60 includes a controller 61 that is a control unit that controls the operation of the entire dredging station 50 including the walking operation of the dredging arrow 52 to drive the dredging station 50 and the dredging device 100. Is built-in.
Thereby, the dredging station 50 receives the supply of the required pressure oil from the floating station 1 via the umbilical cable 8 and the supply of the electric power and the control signal of the management computer 9 to the control unit 60. The controller 61 of the control unit 60 functions as a control unit that controls the attitude of the dredging station 50 by driving each jack mechanism 69 based on a command from the management computer 9 on the floating station 1 side.

Next, the horizontal movement mechanism of the dredging station 50 will be described in detail with reference to FIGS. 4 to 6 show the landing preparation posture of the dredging arrow 52 when the dredging station 50 is landed on the lake bottom SB of the dam lake from the floating station 1 described above. In the landing preparation posture, the centers (centers of gravity) G in the horizontal plane of the upper frame 51X, the intermediate frame 51M, and the lower frame 51Y match. In FIG. 5, the reference numeral CL indicates the center axis of each support leg 66.
As shown in FIG. 4, the upper frame 51 </ b> X has a rectangular frame shape in a plan view, and is separated from each other in the Y direction with a pair of vertical girder Xb having a rectangular cylindrical shape provided in parallel in the X direction. And a pair of horizontal girder Xa having a rectangular cylindrical shape provided in parallel with each other. On each outer side surface of the two horizontal girder Xa, an X moving rack Rx is attached symmetrically from the center along the extending direction of the horizontal girder Xa.

Further, as shown in the figure, the lower frame 51Y has a rectangular frame shape in plan view, and a pair of horizontal tubular girder Yb formed in parallel with each other and separated in the X direction and in the Y direction. It has a pair of vertical girder Ya having a rectangular cylindrical shape and provided in parallel with each other at a distance. On the outer surfaces of the two vertical girders Ya, racks Ry for Y movement are mounted symmetrically from the center along the extending direction of the vertical girders Ya.
As shown in FIG. 6, the intermediate frame 51 </ b> M has a rectangular frame shape in plan view, and is separated from each other in the X direction. And a pair of horizontal girders Ma having a rectangular cylindrical shape provided in parallel with each other. At the center of the intermediate frame 51M in the extending direction of each lateral girder Ma, an X drive motor Mx is arranged in a rectangular cylinder of the lateral girder Ma. At the center of the intermediate frame 51M in the extending direction of each vertical girder Mb, a Y drive motor My is arranged in a rectangular cylinder of the vertical girder Mb.

As shown in FIG. 4, the upper and lower frames 21 </ b> X and 21 </ b> Y have four support legs 66 and a jack mechanism 69 that can move up and down each support leg 66. The intermediate frame 51M and the upper and lower frames 21X and 21Y are slidably supported via a linear motion guide mechanism (not shown), are engaged via a rack and pinion mechanism, and are orthogonal to each other on a horizontal plane. It is configured to be relatively slidable in the direction and the Y direction.
More specifically, as shown in FIG. 4, the dredge arrow storehouse 52 has support legs 66 at each of the four corners of the rectangular frame of the upper frame 51X and at each of the four corners of the rectangular frame of the lower frame 51Y. . Each support leg 66 is provided with a jack mechanism 69 as a Z-direction slide moving mechanism as a lifting / lowering jacking unit.

Two jack mechanisms 69 are provided, one on each side of each support leg 66, and each support leg 66 has a Z-movement rack Rz as shown in FIG. It is attached to the position which opposes in the circumferential direction along the direction, respectively.
The jack mechanism 69 has a motor (not shown), a speed reduction mechanism, and a rack and pinion mechanism. The rack is formed along the axial direction of the support leg 66. The jack mechanism 69 can slide the support leg 66 in the vertical direction (Z direction) and hold the moving position by driving the rack and pinion mechanism via a speed reduction mechanism by a motor. The motor for driving the jack mechanism 69 may be a drive by fluid pressure (for example, hydraulic drive) or a drive by electric power (for example, an electromagnetic motor) (hereinafter, other drive motors). In the same).

The jack mechanism 69 corresponding to each Z movement rack Rz has a Z drive motor (not shown), a pinion mounted on an output shaft of the Z drive motor, and the Z movement rack Rz meshed with the pinion. A rack and pinion mechanism is configured. Thereby, each support leg 66 relatively slides in the Z direction with respect to each of the upper and lower frames 21X and 21Y to which the support leg 66 is attached, and the support legs 66 cooperate with the upper and lower frames 21X and 21Y. Ascent and descent are possible.
The linear motion guide mechanism of the upper frame 51X has a skidding rail (not shown) attached to the bottom surface of the horizontal girder Xa of the upper frame 51X along the extending direction of the horizontal girder Xa. The upper and lower sides of the skidding rail are guided by bearing plates (not shown). The skidding rail is attached from end to end of the upper frame 51X along the lateral girder Xa of the upper frame 51X.

The bearing plate is attached to the upper surface of the corner of the horizontal girder Ma of the intermediate frame 51M. A holding claw (not shown) is attached to the same position as the bearing plate so as to cover the skidding rail from right and left. The holding claw supports the skidding rail from both sides so as to prevent the upper frame 51X from falling when the upper frame 51X moves in the X direction.
An X-movement pinion (not shown) is mounted on the drive shaft of the X drive motor Mx, and projects to a position facing the rack surface of the X-movement rack Rx. The X-movement pinion is meshed with the X-movement rack Rx, is driven synchronously by an X drive motor, and is configured to be able to slide the upper frame 51X in the X direction.

On the other hand, the linear motion guide mechanism of the lower frame 51Y has a skidding rail (not shown) mounted on the upper surface of the vertical girder Ya of the lower frame 51Y along the extending direction of the vertical girder Ya. The skidding rail is attached from end to end of the vertical girder Ya of the lower frame 51Y.
Similar to the upper frame 51X, the lower frame 51Y has a bearing plate (not shown) attached to the lower surface of the corner of the vertical girder Mb of the intermediate frame 51M, and guides the skidding rail up and down by the bearing plate. A holding claw is attached at the same position as the bearing plate so as to cover the skidding rail from the left and right, and when the lower frame 51Y moves in the Y direction, the skidding rail is positioned on both sides to prevent the lower frame 51Y from dropping. We support from.

A Y-movement pinion Py is mounted on the drive shaft of the Y-drive motor My, and projects to a position facing the rack surface of the Y-movement rack Ry. The Y-movement pinions Py are respectively meshed with the Y-movement racks Ry, synchronously driven by a Y-drive motor My, and are configured to be able to slide the lower frame 51Y in the Y-direction.
The intermediate frame 51M and the upper and lower frames 51X and 51Y of the dredging yakura 52 show an example that can be moved in the horizontal direction via a rack and pinion mechanism. There is no limitation, and various moving mechanisms can be adopted as long as the moving mechanism can move in the horizontal direction.

For example, a moving mechanism that slides using a hydraulic cylinder method can be used. Similarly, an example is shown in which each support leg 66 can be slid relative to each other in the Z direction via a rack and pinion mechanism. However, the present invention is not limited to this. it can. The invention is not limited to the hydraulic drive, and may be an electric drive.
Further, under the control of the management computer 9, the dredging station 50 controls the dredging device 100 to move the dredging device 100 in the X direction and the predetermined section of the platform 51 by the drive control of the X direction moving mechanism 53 and the Y direction moving mechanism 54 by the controller 61. While moving in the Y direction, the driving of the dredging pump 30 allows the muddy water taken together with the dredged material to be discharged from the discharge hose 7 as high-pressure muddy water.

Thereby, the dredging station 50 performs the walking control process by the horizontal slide moving mechanism that slides the upper and lower frames 21X and 21Y in the X direction and the Y direction, and the slide movement mechanism that slides each support leg 66 in the Z direction. In accordance with the procedure, the planned dredging area is walked in the X-direction and the Y-direction by the dredge arrow 52, and the dredging device 100 is moved in the X-direction and the Y-direction so that the predetermined section can be dredged sequentially.
Here, in the lake bottom SB of the dam lake, the dredging station 50 needs to cope with soft ground deposited on the lake bottom of the dam lake, slopes and undulations. On the other hand, as shown in FIG. 3, the dredging station 50 of the present embodiment has an inertial sensor 80 as a posture detection sensor in which the control unit 60 detects a desired posture of the platform 51 of the dredge 52 for dredging.

In the present embodiment, the jack mechanism 69 that drives each support leg 66 is provided with a torque detector (not shown). Each torque detector is a torque meter that can detect the torque of each drive motor that drives the pinion of the rack and pinion mechanism of each jack mechanism 69. Each torque detector detects a motor torque of each drive motor at any time, and can output detected torque information to the controller 61 of the control unit 60.
The controller 61 includes a computer and a program for executing an attitude control process. The controller 61 performs a walking control process of the dredge arrow 52 and an attitude control process of the dredge arrow 52, and the dredging control process of the dredge station 50 and other necessary processes. Perform various processing.

When the attitude control process of the dredging station 50 is executed, the controller 61 determines the degree of imbalance of the attitude of the dredging station 50 itself based on the output of the inertial sensor 80, and determines the degree of imbalance of the attitude of the dredge station 50 itself. The posture stability control for maintaining the posture stability is performed by adjusting each drive motor that drives the pinion.
In particular, the dredging station 50 of the present embodiment needs to cope with soft ground deposited on the bottom of the dam lake, slopes and undulations. A dynamic posture change caused by collapse of a tree or the like is measured by an inertial sensor 80 including an accelerometer and an angular accelerometer such as a gyroscope.

  It should be noted that an inclination sensor for measuring a static attitude can be used together. In addition, control for maintaining the stability of the posture using a thruster or a water jet may be performed for posture control. The controller 61 adjusts the leg length of each support leg 66 based on the posture detection information of the inertial sensor 80 so that the posture of the dredging station 50 is horizontal. Thereby, the dredging station 50 can land on the bottom of the dam lake in a stable posture.

Next, the dredging device 100 installed in the dredge arrow 52 of the dredging station 50 will be described in detail with reference to FIGS. 7 and 8.
As shown in FIGS. 7 and 8, the dredging device 100 of the present embodiment includes a rectangular frame-shaped housing 38, a dredging pump 30 provided inside the frame of the housing 38, and two And shaft crushers 10 and 20.
The two twin-screw crushers 10 and 20 are provided on the suction port 36 side of the dredging pump 30, and are arranged in two stages vertically along the longitudinal direction of the housing 38. As shown in FIG. 3, the upper portion of the housing 38 is supported at a position on the lower surface of the Y movement frame 54 so as to be able to move up and down via an elevating device 90, and is driven by the elevating device 90 to be moved to the left and right elevating racks 91. Along the Z direction.

The dredging pump 30 of the present embodiment employs an underwater sand pump.
The dredging pump 30 includes a pump driving unit 31 and a casing 34 provided below the pump driving unit 31. A suction port 36 is provided on the bottom surface of the casing 34, and a suction hopper 40 whose diameter increases downward is attached to the suction port 36. A drain pipe 37 is connected to a side surface of the casing 34, and the drain pipe 37 is connected to a flexible drain hose 7 extending along the lake bottom.
The submersible motor 32 is built in the pump drive unit 31. A captire cable 39 is connected to the upper part of the pump driving unit 31 from the control unit 60, and electric power supplied from the generator 2 provided at the floating station 1 on the lake is supplied from the control unit 60 via the captire cable 39 to the underwater. It is supplied to the motor 32.

The drive shaft 33 of the underwater motor 32 has its upper and lower portions rotatably supported by bearings 41A and 41B, and the lower end of the drive shaft 33 protrudes downward from the upper center of the casing 34. In the casing 34, an impeller 35 is coaxially mounted at the tip of a drive shaft 33. A shaft seal 42 such as a mechanical seal or an oil seal is provided between the pump drive unit 31 and the casing 34 at a position around the drive shaft 33 of the submersible motor 32.
Accordingly, when the submersible motor 32 is driven, the impeller 35 rotates in a predetermined direction to generate a vortex in the casing 34, and the pump drainage amount from the suction hopper 40 facing the lake bottom side is increased. The muddy water is sucked together with the crushed dredged material according to the above, and can be discharged from a suction port 36 to a drain hose 38 via a discharge pipe 37.

The two twin-screw crushers 10 and 20 of the present embodiment each employ a twin-screw crusher that crushes by a slit cutter method.
Among the two twin-screw crushers 10 and 20, the lower-stage twin-screw crusher 10 has a pair of drum cutters 12 and 13 having a function of scraping dredged materials such as gravel and deciduous trees and a function of roughly crushing. On the other hand, the upper-stage twin-screw crusher 20 has a fine crushing function using a twin slit cutter in which the pair of drum cutters 22 and 23 crush more finely to a size smaller than a predetermined size.
Specifically, as shown in FIG. 8, the lower-stage twin-screw crusher 10 includes a pair of two horizontal rotating shafts that are parallel to each other on a lower stage in a frame 45 at a lower end thereof in a posture in which the casing 38 is raised. 14 and 15 are supported by a frame 45, respectively, and a pair of cylindrical drum cutters 12 and 13 are mounted on each of the horizontal rotation shafts 14 and 15. The distal ends of the rotating shafts 11 and 12 are rotatably supported by a frame 45 via bearings 19. At the base end of the hollow cylindrical rotary shafts 11 and 12, a hydraulic motor 11 for driving the rotary shafts 11 and 12 to rotate is mounted.

Each of the pair of drum cutters 12 and 13 has a plurality of crushing blades 16 which are alternately fitted at fixed intervals via annular spacers 17 which are in close contact with each other in the axial direction, and are fixed by fixed keys 18. The crushing blade 16 has a substantially disk shape, and a plurality of claws are provided at regular intervals on an outer peripheral portion thereof. The pair of drum cutters 12 and 13 are arranged side by side at a position where each crushing blade 16 is fitted into an annular groove formed at the position of the other spacer 17.
Then, the pair of drum cutters 12 and 13 constantly and closely shear the dredged material scraped into the frame 45 by the rotational driving of the rotating shafts 11 and 12 at a portion where the crushing blades 16 of both shafts mesh. It is designed to be crushed by the slit cutter method. Thereby, both the crushing blades 16 have the effect of scraping the dredged material during the forward rotation and the effect of crushing the dredged material by the shearing action by approaching the outer peripheral surface of the opposing spacer 17 in sliding contact. The dredged material is scraped from below the casing by the two crushing blades 16 and moves toward the upper upper biaxial crusher 20 while being crushed by the shearing action of the slit cutter.

Similarly, in the upper-stage twin-screw crusher 20, a pair of two horizontal rotation shafts 24, 25 parallel to each other are supported by the frame 45 on the upper stage in the frame 45, respectively. , 25 are provided with a pair of cylindrical drum cutters 22, 23, respectively. The distal ends of both rotating shafts 21 and 22 are rotatably supported by a frame 45 via bearings 29. At the base end of the hollow cylindrical rotary shafts 21 and 22, a hydraulic motor 21 for rotating the rotary shafts 21 and 22 is mounted.
Then, the pair of drum cutters 22 and 23 constantly shear the dredged material scraped into the frame 45 by the rotational driving of the rotating shafts 21 and 22 at a portion where the crushing blades 26 of both shafts mesh. It is designed to be crushed by the slit cutter method. Thereby, both the crushing blades 26 have the effect of scraping the dredged material at the time of forward rotation and the effect of crushing the dredged material by the shearing action by approaching the outer peripheral surface of the opposing spacer 27 in sliding contact. The dredged material is scraped from below the casing by the two crushing blades 26, and is moved toward the upper suction hopper 40 of the dredging pump 30 while being crushed by the shearing action of the slit cutter.

Here, in the crushing machine for dredging of the present embodiment, the pair of drum cutters 12 and 13 of the lower-stage twin-screw crusher 10 roughly crush (primary crushing) to a size that allows the dredged material to pass through the annular groove between the adjacent crushing blades. ) Is set for each part. The size of each part of the pair of drum cutters 22 and 23 of the upper-stage twin-screw crusher 20 is set so that the roughly crushed dredged material is further finely crushed (secondarily crushed) to a size equal to or less than a predetermined size. ing.
The pair of drum cutters 22 and 23 of the upper-stage twin-screw crusher 20 are provided with scrapers 44 at positions facing the crushing blades 26 and the spacers 27, as shown in FIG. The scraper 44 is disposed so as to protrude from the side of the frame 45 so as to fill a gap between the crushing blade 26 and the inner surface of the frame 45, and scrapes the dredged material sandwiched between the crushing blades 26 of the pair of drum cutters 22 and 23. To take.

Here, the lower-stage twin-screw crusher 10 of the present embodiment is configured so that the rotation speed and the rotation direction of the horizontal rotation shafts 14 and 15 can be changed. The rotation speed and the rotation direction can be changed.
More specifically, the drive units of the two twin-screw crushers 10 and 20 of the present embodiment are variable as drive motors for driving a pair of drum cutters 12, 13 and 22, 23 as shown in FIG. The displacement type hydraulic motors 11 and 21 are provided, respectively. Each of the hydraulic motors 11 and 21 is provided with a swash plate (not shown). By tilting the swash plate, it is possible to change the flow direction of the pressure oil to be discharged and change the discharge flow rate of the pressure oil. I have. Furthermore, torque control is possible by controlling the pressure of the hydraulic oil supplied from the hydraulic pump 3 side of the floating station 1, and output (rotational speed) control is performed by controlling the flow rate supplied from the hydraulic pump 3 side. Has become possible.

  Thus, in the two twin-screw crushers 10 and 20 of the present embodiment, when dredged material having a high crush resistance is raked, the rotation speed is automatically reduced, and the output torque required for crush is reduced. When the dredged material that is controlled to increase and the crushing resistance is small is raked in, each hydraulic motor automatically increases the rotation speed and increases the rotation speed while maintaining the output torque required for crushing. 11 and 21 are controlled by constant horsepower.

Next, the procedure of dredging sediment from the bottom SB of the dam lake by the dredging system including the above-described dredging station 50 and the floating station 1 and the operation and effect of the dredging method of the sediment by the dredging system and the dredging device 100 are described. explain.
First, as shown in FIG. 1, the floating station 1 from which the dredging station 50 is hung is anchored at a target position on the lake SL. Next, using a working machine 6 such as a crane installed at the floating station 1, the dredging station 50 is lowered into the water, and the dredging station 50 is placed at an appropriate position on the lake bottom SB of the dam lake so that the arrangement shown in FIG. Install.

When the dredging station 50 is in operation, the required pressure oil is supplied from the floating station 1 to the controller 61 via the umbilical cable 8, and power and control signals are supplied to drive the dredging station 50 and the dredging device 100. The excavated sediment is sucked together with the muddy water, and is moved from the arrangement position of the dredging station 50 to a transfer position on the lake bottom via a drainage hose 7 arranged underwater.
When receiving the dredging start command from the management computer 9, the controller 61 of the dredging station 50 dredges a predetermined area inside the intermediate frame 51M with the dredging device 100. Hereinafter, the predetermined area inside the intermediate frame 51M is also referred to as “one section”.

In the present embodiment, first, dredging is started in a state where the vertical posture of the dredging device 100 is securely held with respect to the platform 51. The dredging device 100 is driven by the dredging pump 30 while excavating the bottom SB of the dam lake into a substantially rectangular cross section by the movement of the drum cutter forming a pair of the two twin-screw crushers 10 and 20, together with the dredged material. The collected mud is discharged from the discharge hose 7 as high-pressure mud. After dredging, an excavation groove VH is formed in the ground in “one section”.
Here, in the lake bottom SB of the dam lake, it is necessary to cope with soft ground, inclination and undulation that accumulate on the lake bottom. On the other hand, according to the present embodiment, since each support leg 66 can be individually raised and lowered, the vertical direction of the dredging device 100 with respect to the dredge Excavation can be performed stably while maintaining the posture.

In both the twin-screw crushers 10 and 20 of the dredging device 100, the crushing blades provided on each shaft and meshing with each other are rotated inward (forward rotation) when used. That is, the pair of opposing crushing blades rotate in opposite directions. When the dredged material is scraped into the frame 45 by the lower biaxial crusher 10, the pair of crushing blades of the lower biaxial crusher 10 sends the dredged material toward the upper upper biaxial crusher 20 while primary crushing the dredged material. .
As described above, according to the dredging apparatus 100 of the present embodiment, the two twin-screw crushers 10 and 20 are configured in two upper and lower stages. Since the pair of drum cutters of the upper-stage twin-screw crusher 20 have a fine crushing function using a twin slit cutter that crushes to a predetermined size or less, Even when the object includes cobblestones or deciduous trees, the sediment can be reliably crushed to a size that can be sucked and discharged by the dredging pump 30 installed above the upper-stage twin-screw crusher 20. Therefore, it is excellent in preventing or suppressing the blockage of the dredging pump 30.

Next, the dredging apparatus 100 is moved within a section by a specific distance from the initial dredging position by moving the dredging apparatus 100 in the X or Y direction by the X and Y moving frames 53 and 54. After that, the dredging in one section is repeated by repeating the procedure of the dredging drooping by raising and lowering the twin-screw crushers 10 and 20 and the horizontal moving dredging in the X or Y direction by the X and Y moving frames 53 and 54. continue.
In the dredging after the dredging in the section, the position where each support leg 66 is erected is raised and lowered as appropriate according to the width of the excavation groove VH and the condition of the bottom of the dam lake. That is, in FIG. 2, when the groove width of the excavation groove VH is narrow or the groove width is widened, the landing posture of the dredge yakura 52 is stabilized according to the width of the excavation groove VH and the lake bottom situation of the dam lake. Then, each support leg 66 is grounded.

And by repeating the dredging procedure from the hanging dredging process to the horizontal dredging process in a state where the posture of the dredging station 50 is stable, dredging in one section can be stably continued. Further, by adjusting the height of the dredge yakura 52 according to the elevating operation position of each support leg 66, and repeating the dredging procedure from the hanging dredging process to the horizontal dredging process, the height of the above-mentioned process is reduced by one step. Dredging can be continued.
When the dredge pump 30 is driven at the same time as the excavation by the two twin-screw crushers 10 and 20 described above, the excavated sediment is discharged from the drain pipe 37 through the drain hose 7 to a predetermined location at the lake bottom. Can be continuously moved to the relocation position M. After dredging to the maximum dredging depth of the dredging device 100 in one section, the dredging station 50 moves the dredging station 50 itself in the XY plane after retreating the dredging apparatus 100, and moves the X-D in the next section. Dredging is performed sequentially so as to scan the entire Y plane. In this way, according to the dredging device 100, in one section, the dredging of the sediment can be continued at the bottom SB of the dam lake.

The movement in the XY plane in one section and the dredging after the movement may be automatically performed by a computer (the management computer 9, the controller 61, and the like), or the condition of the dredging station 50 may be determined by the operator on the lake. The monitoring may be performed by a manual operation of an operator while monitoring from the floating station 1.
As described above, according to the dredging station 50 of the present embodiment and the dredging system using the same, the dredge yakura 52 is erected on the lake bottom SB of the dam lake with the plurality of support legs 66, Since the twin-screw crushers 10 and 20 are installed so as to be slidable to the left and right, and the dredging pump 30 is installed on the upper part thereof, even if the lake bottom SB is very uneven, the shape of the lake bottom may be reduced. The shaft crushers 10 and 20 can be accurately followed. Therefore, dredging can be performed while efficiently crushing the sediment on the lake bottom SB.

Further, according to the dredging station 50 of the present embodiment and the dredging system using the same, the dredge yakura 52 is wound around the working machine 6 mounted on the floating station 1 provided on the water of the dam lake. No matter what shape the lake bottom SB has, the fall of the dredging station 50 can be reliably prevented.
In addition, the dredging device according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described dredging system of the first embodiment, the dredging system is transported by a vehicle such as a truck to a lake shore leading to a dam lake, and is transported to a target position of a lake SL on the dam lake by a working machine such as a crane. Although an example has been described, the dredging system according to the present invention can employ various transport methods and berthing methods depending on the condition of the dam lake. Hereinafter, a second embodiment of the dredging system will be described as another example of implementing the transport method and the berthing method according to the situation of the dam lake.

  The dredging system of the second embodiment, as the situation of the dam lake, of the equipment required for the dredging system, the dredging station can be transported to the lake shore leading to the dam lake by a vehicle such as a truck. This is an example in which transport in a divided state to be described is possible. Further, in the second embodiment, the lake shore of the dam lake has an area capable of carrying the floating station and the dredging station, and the slope of the lake shore from the loading location to the dam lake allows the floating station and the dredging station to be safely connected. This is an example assuming a case in which a transportable state (for example, a gentle slope) is provided.

The dredging system of the second embodiment differs from the dredging system of the first embodiment in that the water station has a split structure, and has wheels for sliding on the shore slope and a thruster for water movement, The difference is that the dredging station is provided with a floating body capable of pouring and draining, a wheel for sliding on a shore slope, and a thruster for moving on water. The other configuration is the same as that of the first embodiment, and therefore, only the differences will be described below, and the other components will be denoted by the same reference numerals and description thereof will be omitted.
As shown in FIG. 9, in the dredging station 50B of the second embodiment, a rectangular parallelepiped floating body 71 is mounted on each of the left and right outer surfaces of the upper frame 51X in FIG. The floating body 71 is configured such that the dredging station can be settled by floating the dredging station on water and pouring water.

On the outer surface of one of the floating bodies 71 (the right side in the figure), two thrusters 73 are provided apart from each other in the longitudinal direction of the floating body 71, and a traction portion 74 is provided at a central position of the two thrusters 73. Have been. When the dredging station 50B of the second embodiment floats on the water, the dredging station 50B can be propelled on the water by driving the two thrusters 73.
Further, four wheels 72 are provided on the side surfaces of the floating body 71 on the side orthogonal to the surface on which the floating body 71 is mounted, at the four front, rear, left and right corners of the upper frame 51X. The four wheels 72 are rotatably supported by a support shaft projecting horizontally to the side when the support legs 66 are most shortened, and the four wheels 72 support the dredging station 50 by traction. It is provided so that it can run.

On the other hand, as shown in FIG. 10, the floating station 1 </ b> B of the second embodiment includes a main body 4 and two connected bodies 81 that are detachably connected to each other and can float on the water. The state in which the main body 4 and the two connecting portions 81 are integrated has the same configuration as the floating station 1 of the first embodiment.
The two connecting body portions 81 are detachable rectangular parallelepiped connecting floating members at the attaching / detaching position indicated by reference numeral 81j, and are detachably attached to both ends of the right outer surface of the main body portion 4 by bolts and nuts. You. In the mounted state, the main unit 4 of the floating station 1 projects horizontally to the right from the upper and lower ends of the right outer surface in the figure, whereby a U-shaped recess is formed in a plan view to dock the dredging station 50B. It is defined as a bay DB. In addition, the main body 4 also has a floating body, and the main body 4 alone can be floated on the water.

A thruster 83 is provided on an end face on the right side in the figure of each of the connecting body portions 81. The water station 1 of the second embodiment can be propelled on water by driving two thrusters 83 in a state in which the connecting body 81 and the main body 4 are integrated.
In a state in which the connecting body 81 and the main body 4 are integrated with each other, the four corners of the front, rear, left and right side surfaces are provided on the surface orthogonal to the surface on which the connecting body 81 is mounted, and Wheels 82 are provided. The four wheels 82 are rotatably supported by support shafts extending horizontally to the side, and can travel by being towed while supporting the water station 1B.

  As described above, according to the dredging system of the second embodiment, the connected floating station 1B and the dredging station 50B have the four wheels 82 and 83, respectively. In a state where each of the dredging stations 50B is supported by the four wheels 82 and 83, for example, by using a winch or the like, a wire is slowly pulled along the shore slope while being pulled by a wire, so that the dredging station 50B can be easily transported to the dam lake. be able to. Then, the floating station 1 on which the connecting floating body is mounted and the dredging station 50 can be carried above the dam lake.

Since the docking bay DB is provided in the floating station 1B, the thruster 73 of the dredging station 50B is driven to move the thruster 73 into the docking bay DB on the floating station 1B side as shown in FIG. The dredging station 50B can be accommodated (see FIG. 12), and the dredging station 50B can be moved to the target position of the lake SL together with the floating station 1B and anchored.
Next, after berthing at the target position on the lake SL, as shown in FIG. 12, the dredging station 50B is hung down by the wire 5 of the work machine 6, and then, after being poured into the floating body 71 of the dredging station 50, as shown in FIG. As shown in (1), as in the first embodiment, the dredging station 50B can be extended by suspending the wire 5 of the working machine 6 by unwinding the wire 5 and standing on the bottom SB of the dam lake.

As described above, according to the dredging system according to the second embodiment, the dredging station 50B has the same configuration as that of the first embodiment. The machine can be accurately followed. Therefore, the sediment at the bottom of the lake can be efficiently crushed and dredged with a dredging pump. And since the floating station 1B has the working machine 6 which can raise and lower the dredging station 50B via the wire 5, the dredging station 50B can be surely prevented from tipping over regardless of the shape of the lake bottom SB.
Here, in the dredging system described in Patent Document 1 described above, it is necessary to lay a track on the buoyant body, so that there is a problem that the buoyant body is enlarged, and the device configuration on the buoyant body is also complicated. In addition, large and complicated installation work is required. Further, when the dredging system described in the document is carried in, there is a problem that a large truck, a trailer, a rough terrain crane, and the like are required according to the increase in size.

On the other hand, in the case of the dredging system of the second embodiment, since the floating station 1B has the connecting part 81 and the main part 4 which are detachably connected to each other, the main part 4 and the connecting part 81 Is separated, the size can be reduced at the time of transportation, the configuration of the apparatus is simplified, and the installation work is facilitated. Further, when loading and unloading the dredging system, the loading and unloading can be performed without using a large rough terrain crane.
The dredging station 50B has a floating body 71 capable of floating the dredging station 50B above water and sinking the dredging station 50B by water injection, and a thruster 73 capable of propelling the dredging station 50B above the water. 1B is equipped with a thruster 83 capable of propelling the floating station 1B above the water, so that another arrangement device such as a tow boat above the water is not required.

Further, in the dredging system of the present embodiment, the dredging station 1B has the plurality of wheels 72 and the traction portion 74 provided on a surface orthogonal to the axle of the wheels 72, so that a large rough terrain crane is not used, For example, with a winch provided in a relatively small transport device such as a vehicle-mounted crane or a carrier car, the dredging station 1B can be pulled out and carried in by using a slope to the lake surface by pulling the dredging station 1B with a wire.
Similarly, since the floating station 1B has the plurality of wheels 82 and the work machine 6 capable of winding the wire 5, the floating station 1B itself can be pulled out by the wire 5 and carried out and carried in. . Therefore, with such a configuration, assembling work and carrying-in work of the apparatus can be performed with a relatively small transport device, and the present invention can be applied to a dam in a mountainous area having a narrow road or a tunnel. That is, in this example, the working machine 6 functions as a towing unit.

DESCRIPTION OF SYMBOLS 1 Floating station 2 Generator 3 Hydraulic pump 4 Main unit 5 Wire 6 Work machine (traction unit)
7 drain hose 8 umbilical cable 9 management computer (control means)
DESCRIPTION OF SYMBOLS 10 Lower stage twin-shaft crusher 11 Hydraulic motor 12 Drum cutter 13 Drum cutter 14 Horizontal rotary shaft 15 Horizontal rotary shaft 16 Crushing blade 17 Spacer 18 Fixed key 19 Bearing 20 Upper twin-shaft crusher 21 Hydraulic motor 22 Drum cutter 23 Drum cutter 24 Horizontal Rotating shaft 25 Horizontal rotating shaft 26 Crushing blade 27 Spacer 28 Fixed key 29 Bearing 30 Dredge pump 31 Pump drive unit 32 Submersible motor 33 Drive shaft 34 Casing 35 Impeller 36 Suction port 37 Drain pipe 38 Housing 39 Capty cable 40 Suction hopper 41A , 41B Bearing 42 Shaft sealing part 44 Scraper 45 Frame (of crusher) 46 Control valve part 47 Motor part 48 Drive part 49
50 Dredging Station 51 Platform 51X Upper Frame 51Y Lower Frame 51M Intermediate Frame 52 Dredge Yakura 53 X Movement Frame 53X Movement Mechanism for X Direction 54 Y Movement Frame 54Y Movement Mechanism for Y Direction 60 Control Unit 61 Controller 66 Support Leg 69 Jack Mechanism 71 Floating body 72 Wheel 73 Thruster 74 Traction unit 80 Inertial sensor 81 Connecting body unit 82 Wheel 83 Thruster 84 Traction unit 90 Elevating device 91 Elevating rack 92 Drive unit 100 Dredging device S Arranged position M Transfer position

Claims (5)

A dredge installed on the bottom of the dam lake, a crusher slidably and vertically slidably mounted on the dredge, and a dredge pump installed above the crusher. ,
The dredge arrow is individually moved in the Z direction via a platform, a horizontal moving mechanism capable of moving the platform in at least one of an X direction and a Y direction orthogonal to each other in a horizontal plane, and a vertical moving mechanism. A plurality of support legs configured to be slidable and each of the support legs is settled on the bottom of a dam lake. The crusher is composed of two twin-screw crushers arranged in two stages up and down, each having a pair of drum cutters,
The upper two-shaft crusher is provided with a pair of drum cutters at a position facing the suction side of the dredging pump,
2. The lower-stage twin-screw crusher according to claim 1, wherein a pair of drum cutters of the upper-stage twin-screw crusher are provided with their own pair of drum cutters on a side opposite to a suction side of the dredging pump. 3. Dredging station as described. A dredging station according to claim 1 or 2, and a floating station provided on the water of the dam lake,
The dredging system wherein the platform of the dredging station is connected to the floating station via a wire wound around a work implement attached to the floating station. The dredging station has a floating body capable of sinking the dredging station by floating and pouring the dredging station on water, and a thruster capable of propelling the dredging station,
The surface station has a main body and a connector body detachably connected to each other and floatable on the water, and a thruster mounted on the main body part or the connector body and capable of propelling the water station. ,
The dredging system according to claim 3, wherein the body portion and the connector portion define a docking bay capable of receiving the dredging station above the water when they are connected to each other.   The dredging system according to claim 4, further comprising a plurality of traveling wheels and a traction unit provided on a surface orthogonal to an axle of the wheels at each of the dredging station and the floating station.

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