JP7107767B2 - Dredging station and dredging system - Google Patents

Description

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

In general dams, dredging is necessary to discharge deposits such as mud, earth and sand, cobbles, gravel, and sunken wood deposited on the bottom of the dam lake in order to maintain the water storage capacity of the dam. In particular, in dams for hydroelectric power generation, sediments near water intakes become a problem, and dredging work near water intakes is carried out in a timely manner.
Conventional dam dredging methods include a dredging method that uses a grab bucket to pick up sediment from the bottom of the lake and load it onto an earthen barge, and a dredging method that uses a dredging pump to suck up the sediment from the bottom of the lake and transport it. A dam dredging construction method using a dredger is known.
In these dam dredging methods, workers with special skills are required for dredging work using grab ships and pump dredgers, so securing workers and passing on skills is a problem. There is also the problem that the dredging equipment, including the dredging work boat, must be transported by land and placed in the dam lake for each dredging operation.

For this reason, in Patent Document 1, for example, a buoyant body formed to be movable on water, a base machine that travels and moves along a track laid on the buoyant body, and a base machine that moves up and down from the base machine to the bottom of the water. A dredging system has been proposed comprising a horizontal multi-axis cutter for excavating sediment that can be suspended and a pump for sucking and discharging the sediment excavated by the horizontal multi-axis cutter. .

JP 2007-146481 A

However, the dredging system described in Patent Document 1 has a structure in which a horizontal multi-axis cutter suspended from a base machine traveling along a track laid on a buoyant body excavates sediment.
Therefore, when the horizontal multi-axis cutter is moved to follow the shape of the lake bottom on a rugged lake bottom, the wire is wound by the winch attached to the buoyant body and along the track laid on the buoyant body. There is a problem that the operation itself is difficult because it is necessary to perform an interlocking operation with the traveling movement of the traveling base machine.

In addition, excavation work with a horizontal multi-axis cutter causes suspension of lake water, and it is difficult to confirm the shape of the suspended lake bottom from the water. Therefore, the horizontal multi-axis cutter is operated to follow the shape of the lake bottom 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 excavate and dredge deposits such as gravel and sunken wood on the bottom of the lake efficiently.
Therefore, the present invention has been made by paying attention to such problems, and an object of the present invention is to provide a dredging station and a dredging system capable of efficiently excavating and dredging sediment on the bottom of a dam lake. do.

In order to solve the above-mentioned problems, a dredging station according to an aspect of the present invention includes a dredging yagnes erected on the bottom of a dam lake, and a crusher mounted on the dredging yagnes to be slidable vertically and horizontally. and a dredging pump installed on top of the crusher, wherein the dredging yagnes are horizontally movable with respect to the platform in at least one of the X and Y directions perpendicular to each other in the horizontal plane. a moving mechanism; and a plurality of supporting legs configured to be individually slidable relative to the platform in the Z direction via a vertical moving mechanism, and each supporting leg resting on the bottom of the dam lake. characterized by

According to the dredging station according to one aspect of the present invention, the dredging pile is erected on the bottom of the dam lake with a plurality of supporting legs, and the crusher is installed in the dredging pile so as to be slidable vertically and horizontally. Since a dredging pump is installed on top of it, even if the lake bottom is highly undulating, the crusher can accurately follow the shape of the lake bottom. Therefore, the sediments on the bottom of the lake can be efficiently crushed (excavated) and dredged by the dredging pump.

Here, in the dredging station according to one aspect of the present invention, the crusher is arranged in two stages, upper and lower, and is composed of two twin-screw crushers each having a pair of drum cutters. The crusher is provided with a pair of drum cutters at a position facing the suction side of the dredging pump, and the lower twin-screw crusher is attached to the dredging pump for the pair of drum cutters of the upper twin-screw crusher. It is preferred that its own pair of drum cutters is provided on the side opposite to the suction side.

With such a configuration, even if the sediment contains cobblestones and fallen wood, the crushing process by the two-stage twin-screw crusher is more efficient than crushing by a single crusher. The sediment can be more reliably crushed to a size that can be sucked and discharged by the existing dredging pump. Therefore, it is more suitable as a configuration for dredging with a dredging pump while efficiently crushing sediment on the bottom of a lake.

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

According to the dredging system according to one aspect of the present invention, the platform of the dredging station is connected to the water station via the wire wound around the working machine attached to the water station provided on the water of the dam lake. Therefore, tipping of the dredging station can be reliably prevented regardless of the shape of the lakebed. Therefore, dredging can be performed with a dredging pump while efficiently crushing the sediment on the bottom of the lake.
Here, in the dredging system described in Patent Document 1, since it is necessary to lay a track on the buoyant body, the buoyant body also becomes large. In addition, since the configuration of the device on the buoyant body becomes complicated, a large-scale and complicated installation work is required. Furthermore, when the dredging system described in the document is brought in, there is a problem that working machines such as large trucks, trailers, rough terrain cranes, etc. are required in accordance with 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 floating the dredging station on water and submerging the dredging station by water injection, a thruster capable of propelling the dredging station, and said water station comprises a body part and a connecting body part which are detachably connected to each other and which can float on the water; , wherein said body portion and connecting body portion, when coupled together, define a docking bay capable of accommodating said dredging station above water.

With such a configuration, the water station has the main body portion and the connecting body portion detachably connected to each other, and when they are connected to each other, a docking bay capable of accommodating the dredging station is defined. By separating the part and the connecting body part, it is possible to reduce the size during transportation, and the configuration of the device is simplified, which facilitates the installation work. 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 the water and submerging the dredging station by pouring water, and a thruster capable of propelling the dredging station. Alternatively, the coupling body may be equipped with thrusters capable of propelling the surface station so that no other deployment device, such as a towboat, on the surface of the water is required.

Further, in the dredging system according to an aspect of the present invention, the dredging station and the water station each have a plurality of wheels for traveling and a traction section provided on a plane perpendicular to the axle of the wheels. is preferred.
With such a configuration, a dredging station can be set up by using a slope to the surface of the lake without using a large rough terrain crane, for example, by using a winch provided on a relatively small transport device such as a vehicle-mounted crane or a carrier car. It is suitable for carrying out and carrying in and out by pulling the water station with a wire or the like. Therefore, with such a configuration, it is easier to assemble the device and carry it in with a relatively small transport device, which is preferable for adapting to dams in mountainous areas with narrow roads and tunnels.

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

1 is a schematic illustration of a first embodiment of a dredging system using a dredging station according to one aspect of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows one Embodiment of the dredging station based on one aspect|mode of this invention, The figure (a) is the top view at the time of dredging, (b) has shown the front view. 1 is a schematic perspective view of one embodiment of a dredging station in accordance with one aspect of the present invention; FIG. 1 is a schematic plan view of a platform that constitutes a dredging station; FIG. 1 is a schematic front view of a platform that constitutes a dredging station; FIG. Fig. 3 is a schematic plan view of the intermediate frame of the platform; 1 is a front view of one embodiment of dredging equipment installed at a dredging station in accordance with one aspect of the present invention; FIG. 1 is a side view of an embodiment of a dredging device according to one aspect of the present invention; FIG. FIG. 2 is a schematic explanatory diagram 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, where (a) is a plan view of the dredging station, and (b) is a It is a front view. FIG. 2 is a schematic explanatory diagram showing a second embodiment of a dredging system according to one aspect of the present invention, where (a) is a plan view of the water station and (b) is a front view. FIG. 4A is a schematic explanatory diagram showing a second embodiment of a dredging system according to one aspect of the present invention, and FIG. b) is a front view of the retraction process. FIG. 2A is a schematic explanatory diagram showing a second embodiment of a dredging system according to one aspect of the present invention, and FIG. , (b) is a front view of the stored state. FIG. 2A is a schematic explanatory diagram showing a second embodiment of a dredging system according to one aspect of the present invention, and FIG. It is a front view showing.

Hereinafter, embodiments of the present invention will be described with appropriate reference to the drawings. This embodiment is an example of a dredging system including a dredging station erected on the bottom of a dam lake and dredging sediment while excavating it, and a water station arranged above the dam lake.
Note that the drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the planar dimensions are different from the actual ones, and the drawings include portions where the relationship and ratio of the dimensions are different from each other. Further, the embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention. etc. are not specified in the following embodiments.

First, the overall configuration of the dredging system of the first embodiment will be described.
This dredging system, as shown in FIG. 1, has a water station 1 placed on the lake SL of the dam lake and a dredging station 50 placed on the 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 arranged in two upper and lower stages.
The dredging station 50 excavates the lake bottom SB of the dam lake on which sediments are deposited by using two twin-shaft crushers 10 and 20 equipped with a dredging device 100, and the twin-shaft crusher 10 , 20, the excavated sediment can be dredged together with muddy water. The dredging system of the present embodiment moves the sediment dredged by the dredging device 100 from the arrangement position S of the dredging station 50 to the relocation position M on the bottom of the lake via the drainage hose 7 arranged underwater. is configured as

Specifically, in the example of this embodiment, the water station 1 is moored at a target position on the lake SL. The water station 1 of the present embodiment also serves as a placement mother ship for transporting the dredging station 50 in a suspended state from the lake SL (transporting in the water) and erecting and placing it on the lake bottom SB of the dam lake.
In the dredging system of the first embodiment, the water station 1 and the dredging station 50 can be transported to the shoreline of the dam lake by a vehicle such as a truck. This is an example assuming a state of use under conditions in which it is possible to transport the device from the ground to the lake.

The water station 1 includes a work machine 6 including a winch, a crane, etc. for constructing and arranging the dredging station 50 on the bottom SB of the dam lake, a generator 2, and a variable capacity type hydraulic power source driven by an internal combustion engine. A hydraulic pump 3 and a management computer 9 constituting control means are provided. The water station 1 transports the dredging station 50 to a predetermined position of the dam lake by towing or self-propelled on the water, suspends the dredging station 50 by the wire 5 of the work machine 6, and erects it 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 the dredging station 50 and the dredging equipment 100 are connected from the water station 1 side. It is possible to supply electric power and control signals necessary for operation, as well as supply of pressure oil.
The umbilical cable 8 has a hybrid structure in which hydraulic hoses for supply and discharge, a power cable, and a signal cable are integrally surrounded and held by a flexible cable bear (cable bear is a registered trademark). . The hydraulic hoses for supply and discharge, the power cable, and the signal cable may be wired and piped separately.

Next, the dredging station 50 will be described in detail with appropriate reference to FIGS. 2 to 6. FIG. The dredging station 50 is a self-propelled dredging machine for dredging sediment on the bottom of a dam lake, which includes the dredging device 100 and a dredging yagura 52 that is self-propelled in the X and Y directions.
As shown in FIG. 2, the dredging station 50 of this embodiment includes a platform 51 having a plurality of rectangular frames, and a plurality of (eight legs in this example) supporting the four corners of the upper and lower frames constituting the platform 51. A dredging shed 52 having support legs 66 and a jacking mechanism 69 is provided. 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 pile 52 includes an upper frame 51X having a rectangular frame shape in plan view, a lower frame 51Y having a rectangular frame shape in plan view, and both platforms 51X and 51Y. and a middle frame 51M having a rectangular frame shape in plan view.
In this example, as shown in FIG. 3, two X movement frames 53 are stretched across the upper frame 51X along the Y direction. Both ends of each X-moving frame 53 are supported on the upper surface of the upper frame 51X via an X-direction moving mechanism 53X. The X-direction moving mechanism 53 has a motor (not shown), a speed reduction mechanism, and a rack and pinion mechanism. It is slidable simultaneously in the X direction along 51X.

A Y movement frame 54 is stretched over the two X movement frames 53 and placed thereon. The Y-moving frame 54 is supported on the upper surface of the X-moving frame 53 via a Y-direction moving mechanism 54Y, and constitutes a Y-direction feeding mechanism of the dredging device 100 . The Y-direction moving mechanism 54 has a motor (not shown), a speed reduction mechanism, and a rack and pinion mechanism. It is slidable along the extension direction (that is, along the Y direction).
Further, the dredging device 100 is supported so as to be able to move up and down via a lifting device 90 which is provided on the lower surface of the Y moving frame 54 and constitutes a feed mechanism in the Z direction of the dredging device 100 . Placed in a suspended position.

The lifting device 90 includes a pair of left and right driving portions 92 provided on the side portion of the Y movement frame 54, and a lifting rack 91 erected in a posture vertically inserted into each of the driving portions 92. . The drive unit 92 has a motor (not shown), a speed reduction mechanism, and a rack and pinion mechanism that meshes with the lifting rack 91. The motor drives the rack and pinion mechanism via the speed reduction mechanism to move the dredging device 100. It is slidable along the lifting rack 91 (that is, along the Z direction).
Furthermore, 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 which is a control unit for controlling the operation of the dredging station 50 as a whole, including the walking motion of the dredging scaffold 52, in order to drive the dredging station 50 and the dredging equipment 100. is built-in.
As a result, the dredging station 50 receives the supply of necessary pressure oil, electric power, and control signals from the management computer 9 from the water station 1 through the umbilical cable 8 to the control unit 60 . The controller 61 of the control unit 60 functions as a control section that controls the attitude of the dredging station 50 by driving each jack mechanism 69 based on commands from the management computer 9 on the water station 1 side.

Next, the horizontal movement mechanism of the dredging station 50 will be described in detail with reference to FIGS. 4-6. 4 to 6 show the preparatory posture of the dredging yagnes 52 when the dredging station 50 is made to touch the bottom SB of the dam lake from the water station 1. The dredging yagnes 52 are: In the bottom-landing preparation posture, the horizontal center (center of gravity) G of the upper frame 51X, the intermediate frame 51M and the lower frame 51Y coincides. In FIG. 5, the symbol CL indicates the central axis of each support leg 66. As shown in FIG.
As shown in FIG. 4, the upper frame 51X has a rectangular frame shape in a plan view, and includes a pair of rectangular cylindrical vertical girders Xb provided parallel to each other and spaced apart in the X direction, and a pair of vertical girders Xb spaced apart in the Y direction. and a pair of rectangular tubular lateral girders Xa provided parallel to each other. On each outer side surface of the two horizontal girders Xa, X-moving racks Rx are attached symmetrically from the center along the extending direction of the horizontal girders Xa.

As shown in the figure, the lower frame 51Y has a rectangular frame shape in a plan view, a pair of rectangular cylindrical horizontal girders Yb provided parallel to each other and spaced apart in the X direction, and It has a pair of rectangular tubular vertical girders Ya which are spaced apart and provided parallel to each other. Y-moving racks Ry are mounted symmetrically from the center along the extending direction of the vertical girders Ya on the outer surfaces of the two vertical girders Ya.
As shown in FIG. 6, the intermediate frame 51M has a rectangular frame shape in a plan view, and includes a pair of rectangular cylindrical vertical girders Mb provided parallel to each other and spaced apart in the X direction, and a pair of vertical girders Mb spaced apart in the Y direction. and a pair of lateral girders Ma each having a rectangular tubular shape provided parallel to each other. The X drive motors Mx are arranged in the rectangular cylinders of the horizontal girders Ma at the central positions in the extending direction of the horizontal girders Ma of the intermediate frame 51M. In addition, Y drive motors My are arranged in the rectangular cylinders of the vertical girders Mb at the central positions in the extending direction of the vertical girders Mb of the intermediate frame 51M.

As shown in FIG. 4, the upper and lower frames 21X and 21Y each have four support legs 66 and a jack mechanism 69 capable of lifting and lowering each support leg 66. As shown in FIG. The intermediate frame 51M and the upper and lower frames 21X and 21Y are slidably supported via a linear motion guide mechanism (not shown) and engaged via a rack and pinion mechanism. It is configured to be relatively slidable in the direction and the Y direction.
More specifically, as shown in FIG. 4, the dredging pile 52 has supporting legs 66 at the four corners of the rectangular frame of the upper frame 51X and the four corners of the rectangular frame of the lower frame 51Y. . Each support leg 66 is provided with a jacking mechanism 69, which is a slide movement mechanism in the Z direction, as a lifting jacking unit.

Two jack mechanisms 69 are provided, one on each side of each support leg 66. As shown in FIG. They are attached at positions facing each other in the circumferential direction along the direction.
The jack mechanism 69 has a motor, speed reduction mechanism, and rack and pinion mechanism (not shown). A rack is formed along the axial direction of the support leg 66 . The jack mechanism 69 drives the rack and pinion mechanism with a motor through a reduction mechanism, thereby allowing the support leg 66 to slide vertically (in the Z direction) and hold the movement position. The motor for driving the jack mechanism 69 may be driven by fluid pressure (for example, hydraulic drive) or driven by electric power (for example, electromagnetic motor) (hereinafter referred to as other drive motors). in the same).

A jack mechanism 69 corresponding to each Z movement rack Rz has a Z drive motor (not shown), a pinion mounted on the output shaft of the Z drive motor, and the Z movement rack Rz meshed with the pinion. A rack and pinion mechanism is constructed. As a result, each support leg 66 slides in the Z direction relative to the upper and lower frames 21X and 21Y to which it is attached, and the cooperation of the support legs 66 allows the upper and lower frames 21X and 21Y to move. Ascend 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 lateral girder Xa of the upper frame 51X along the extending direction of the lateral girder Xa. The top and bottom of the skidding rail are guided by bearing plates (not shown). The skidding rails are attached from end to end of the upper frame 51X along the lateral girders Xa of the upper frame 51X.

A bearing plate is attached to the corner upper surface of the horizontal girder Ma of the intermediate frame 51M. Further, a holding claw (not shown) is attached to the same position as the bearing plate so as to cover the skidding rail from the left and right. The holding claws support the skidding rails from both sides to prevent the upper frame 51X from falling when it moves in the X direction.
An X movement pinion (not shown) is attached to the drive shaft of the X drive motor Mx, and protrudes at 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 synchronously driven by the X drive motor, and is configured to be slidable on 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) attached to 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 one end to the other 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 the bearing plate guides the skidding rail vertically. At the same position as the bearing plate, holding claws are attached so as to cover the skidding rails from the left and right. supported by.

A Y movement pinion Py is attached to the drive shaft of the Y drive motor My, and protrudes at a position facing the rack surface of the Y movement rack Ry. The Y-moving pinions Py are meshed with the Y-moving racks Ry and synchronously driven by the Y-driving motor My so that the lower frame 51Y can slide in the Y-direction.
An example in which the intermediate frame 51M and the upper and lower frames 51X and 51Y of the dredging yagnes 52 can move horizontally via a rack and pinion mechanism is shown. There is no limitation, and various moving mechanisms can be employed as long as they are capable of moving in the horizontal direction.

For example, a moving mechanism that slides using a hydraulic cylinder system can be used. Similarly, each support leg 66 is shown as an example in which it is possible to relatively slide in the Z direction via a rack and pinion mechanism, but it is not limited to this, and for example, a movement mechanism that slides using a hydraulic cylinder system can be used. can. Moreover, it is not limited to a hydraulic drive, and may be an electric drive.
Furthermore, under the control of the management computer 9 , the dredging station 50 moves the dredging device 100 within a predetermined section of the platform 51 in the X direction and the Y direction by drive control of the X direction movement mechanism 53 and the Y direction movement mechanism 54 by the controller 61 . While moving in the Y direction, by driving the dredging pump 30, the muddy water taken in together with the dredged material can be discharged from the discharge hose 7 as high-pressure muddy water.

As a result, the dredging station 50 uses a horizontal slide movement mechanism that slides the upper and lower frames 21X and 21Y in the X direction and the Y direction, and a slide movement mechanism that slides the support legs 66 in the Z direction. According to the procedure, the planned dredging area can be walked in the X direction and the Y direction by the dredging yagura 52, and the dredging device 100 can be moved in the X direction and the Y direction to sequentially dredge the predetermined sections.
Here, at the bottom SB of the dam lake, the dredging station 50 needs to cope with the soft ground deposited on the bottom of the dam lake, as well as slopes and undulations. On the other hand, in the dredging station 50 of this embodiment, as shown in FIG. 3, the control unit 60 has an inertial sensor 80 as an attitude detection sensor for detecting the attitude of the platform 51 of the dredging yagnes 52 at any time.

In this embodiment, the jack mechanism 69 that drives each support leg 66 is equipped with a torque detector (not shown). Each torque detector is a torque meter capable of detecting the torque of each drive motor that drives the pinion of the rack and pinion mechanism of each corresponding jack mechanism 69 . Each torque detector can detect the motor torque of each drive motor at any time and output the detected torque information to the controller 61 of the control unit 60 .
The controller 61 includes a computer and a program for executing attitude control processing, and includes walking control processing for the dredging yagnes 52, attitude control processing for the dredging yagnes 52, dredging control processing for the dredging station 50, and other necessary operations. process.

When the attitude control process of the dredging station 50 is executed, the controller 61 determines the degree of imbalance in the attitude of the dredging station 50 itself based on the output of the inertial sensor 80, and adjusts the rack and pinion mechanism of the jack mechanism 69. Attitude stabilization control is performed to maintain attitude stability by adjusting each drive motor that drives the pinion.
In particular, the dredging station 50 of the present embodiment needs to deal with soft ground deposited on the bottom of the dam lake, as well as slopes and undulations. An inertial sensor 80 including an accelerometer and an angular accelerometer such as a gyroscope measures a dynamic attitude change caused by collapse of a submerged tree or the like.

A tilt sensor for measuring the static attitude can also be used together. For attitude control, thrusters and water jets may be used to maintain attitude stability. 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. This allows the dredging station 50 to land on the bottom of the dam lake in a stable posture.

Next, the dredging device 100 installed in the dredging shed 52 of the dredging station 50 will be described in detail with reference to FIGS. 7 and 8. FIG.
As shown in FIGS. 7 and 8, the dredging device 100 of the present embodiment includes a rectangular parallelepiped frame-shaped housing 38, and a dredging pump 30 and two dredging pumps 30 provided inside the frame of the housing 38. Axial crushers 10, 20 are provided.
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 part of the housing 38 is supported on the lower surface of the Y moving frame 54 via a lifting device 90 so as to be vertically movable. It is slidable along the Z direction.

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

The drive shaft 33 of the underwater motor 32 is rotatably supported by bearings 41A and 41B at its upper and lower ends, and the lower end of the drive shaft 33 protrudes downward from the center of the upper portion of the casing 34 . An impeller 35 is coaxially attached to the tip of the drive shaft 33 in the casing 34 . Between the pump drive section 31 and the casing 34, a shaft seal section 42 such as a mechanical seal or an oil seal is provided around the drive shaft 33 of the submersible motor 32. As shown in FIG.
Accordingly, in the dredging pump 30 of the present embodiment, when the submersible motor 32 is driven, the impeller 35 rotates in a predetermined direction to generate a whirlpool in the casing 34, and the suction hopper 40 facing the lake bottom side discharges the pump water. The muddy water is sucked together with the crushed dredged material according to the pressure and can be discharged from the suction port 36 to the drain hose 38 through the discharge pipe 37 .

The two twin-screw crushers 10 and 20 of this embodiment each employ a twin-screw crusher that crushes by a slit cutter method.
Of the two twin-screw crushers 10 and 20, the lower-stage twin-screw crusher 10 has a pair of drum cutters 12 and 13 that has a raking function and a rough crushing function for dredged materials such as gravel and fallen wood. On the other hand, the upper twin-screw crusher 20 has a pair of drum cutters 22 and 23 which have a fine crushing function by means of twin slit cutters for further crushing to a size smaller than a predetermined size.
More specifically, as shown in FIG. 8, the lower twin-screw crusher 10 has a pair of horizontal rotating shafts parallel to each other on the lower stage in the frame 45 at the lower end of the housing 38 in an upright posture. 14 and 15 are supported by a frame 45, respectively, and a pair of cylindrical drum cutters 12 and 13 are attached to each of the horizontal rotary shafts 14 and 15. As shown in FIG. The tips of both rotating shafts 11 and 12 are rotatably supported by a frame 45 via bearings 19 . A hydraulic motor 11 is attached to the proximal ends of the hollow cylindrical rotary shafts 11 and 12 to drive the two rotary shafts 11 and 12 to rotate.

A pair of drum cutters 12 and 13 are each fitted with a plurality of crushing blades 16 alternately at regular intervals via annular spacers 17 which are in close contact with each other in the axial direction, and fixed with a fixing key 18 . The crushing blade 16 has a substantially disk shape, and has a plurality of claws provided at regular intervals on its outer peripheral portion. A pair of drum cutters 12 and 13 are arranged horizontally in a position where each crushing blade 16 is fitted in an annular groove formed at the position of the other spacer 17 .
The pair of drum cutters 12 and 13 are always in close contact with each other at the portions where the crushing blades 16 of both shafts mesh with each other to shear the material to be dredged into the frame 45 by the rotational driving of both rotating shafts 11 and 12. It is designed to be crushed by a slit cutter method. As a result, when both crushing blades 16 rotate in the normal direction, the action of raking in the material to be dredged and the action of coming close to the outer peripheral surface of the opposing spacer 17 so as to be in sliding contact with each other to crush the material to be dredged by shearing action. The material to be dredged is scraped into the casing from below by the crushing blades 16 and moved upward toward the upper stage twin-screw crusher 20 while being crushed by the shearing action of the slit cutter.

Similarly, the upper-stage twin-screw crusher 20 has a pair of horizontal rotation shafts 24, 25 parallel to each other supported on the upper stage of the frame 45, and each horizontal rotation shaft 24 , 25 are fitted with a pair of cylindrical drum cutters 22 and 23 . The tips of both rotating shafts 21 and 22 are rotatably supported by a frame 45 via bearings 29 . A hydraulic motor 21 is attached to the proximal ends of the hollow cylindrical rotary shafts 21 and 22 to drive the two rotary shafts 21 and 22 to rotate.
The pair of drum cutters 22 and 23 are always in close contact with each other at the portions where the crushing blades 26 of both shafts mesh with each other to shear the material to be dredged into the frame 45 by the rotational driving of both rotating shafts 21 and 22. It is designed to be crushed by a slit cutter method. As a result, when both crushing blades 26 rotate in the normal direction, the action of raking the material to be dredged and the action of coming close to the outer peripheral surface of the opposing spacer 27 so as to be in sliding contact with each other to crush the material to be dredged by the shearing action. The material to be dredged is sucked into the casing from below by the crushing blades 26 and is crushed by the shearing action of the slit cutter while moving upward toward the suction hopper 40 of the dredging pump 30 .

Here, in the dredging crusher of the present embodiment, the pair of drum cutters 12 and 13 of the lower twin-screw crusher 10 roughly crushes (primary crushes) to a size that allows the dredged material to pass through the annular groove between the adjacent crushing blades. ), the dimensions of each part are set so that The dimensions of each part of the pair of drum cutters 22 and 23 of the upper twin-screw crusher 20 are set so as to further finely crush (secondary crush) the coarsely crushed dredged material to a size equal to or smaller than a predetermined size. ing.
The pair of drum cutters 22 and 23 of the upper 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 arranged so as to protrude from the side of the frame 45 so as to fill the gap between the crushing blade 26 and the inner surface of the frame 45, and scrapes the material to be dredged between the crushing blades 26 of the pair of drum cutters 22 and 23. It is designed to take

Here, the lower-stage twin-screw crusher 10 of the present embodiment is configured so that the rotation speed and rotation direction of the horizontal rotation shafts 14 and 15 can be changed, and the upper-stage twin-screw crusher 20 includes a horizontal rotation shaft 24, 25 is configured to change the speed and direction of rotation.
Specifically, each drive unit of the two twin-screw crushers 10 and 20 of this embodiment is a drive motor for driving the pair of drum cutters 12, 13 and 22, 23, as shown in FIG. Equipped with displacement type hydraulic motors 11 and 21, respectively. Each of the hydraulic motors 11 and 21 is provided with a swash plate (not shown), and by tilting the swash plate, the flow direction of the discharged pressure oil can be changed, and the discharge flow rate of the pressure oil can be changed. there is Furthermore, torque control is possible by controlling the pressure of pressure oil supplied from the hydraulic pump 3 side of the water station 1, and output (rotational speed) control is possible by controlling the flow rate supplied from the hydraulic pump 3 side. is possible.

As a result, in the two twin-shaft crushers 10 and 20 of this embodiment, when the material to be dredged with high crushing resistance is raked in, the rotational speed is automatically reduced, and the output torque required for crushing is reduced. When dredged material with low crushing resistance is raked in, the rotation speed automatically increases, and each hydraulic motor increases the rotation speed while maintaining the output torque necessary for crushing. 11 and 21 are under constant horsepower control.

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

When the dredging station 50 is in operation, the water station 1 supplies necessary pressure oil to the controller 61 through the umbilical cable 8, as well as electric power and control signals to drive the dredging station 50 and the dredging device 100, The excavated sediments are sucked together with the muddy water and moved from the location of the dredging station 50 to the transfer location on the bottom of the lake through the drainage hose 7 arranged in the water.
When the controller 61 of the dredging station 50 receives a dredging start command from the management computer 9, the dredging device 100 dredges a predetermined area inside the intermediate frame 51M. In addition, hereinafter, the predetermined area inside the intermediate frame 51M is also referred to as "one section".

In this embodiment, first, dredging is started while the vertical posture of the dredging device 100 is securely held with respect to the platform 51 . The dredging device 100 excavates the lake bottom SB of the dam lake in a substantially rectangular cross section by the movement of the paired drum cutters of the two twin-screw crushers 10 and 20, and is driven by the dredging pump 30, together with the dredged material. The taken muddy water is discharged from the discharge hose 7 as high-pressure muddy water. After dredging, an excavated trench 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 the soft ground deposited on the lake bottom, slopes, and undulations. On the other hand, according to the present embodiment, each support leg 66 can be lifted and lowered individually, so that the vertical position of the dredging device 100 with respect to the dredging shed 52 can be supported while coping with soft ground deposited on the bottom of the lake, slopes, and undulations. Stable excavation can be performed while the posture is securely held.

In both of the twin-shaft crushers 10 and 20 of the dredging device 100, the crushing blades provided on each shaft and meshing with each other rotate inward (forward rotation) during use. That is, both shafts of the pair of opposing crushing blades rotate in opposite directions. When the dredged material is raked into the frame 45 by the lower twin-screw crusher 10, the pair of crushing blades of the lower twin-screw crusher 10 primarily crushes the dredged material and sends it toward the upper upper twin-screw crusher 20. .
As described above, according to the dredging device 100 of the present embodiment, the two twin-screw crushers 10 and 20 are configured in two stages, upper and lower, and the pair of drum cutters of the lower-stage twin-screw crusher 10 can cut gravel, fallen wood, etc. The pair of drum cutters of the upper twin-screw crusher 20 has a fine crushing function by a twin slit cutter that crushes to a size of a predetermined size or less, so that the accumulated Even when objects include boulders and sunken wood, the sediment can be reliably crushed to a size that can be sucked and discharged by a dredging pump 30 installed in the upper part of the upper twin-screw crusher 20.例文帳に追加Therefore, it is excellent in preventing or suppressing clogging of the dredging pump 30 .

The dredging device 100 is then moved within a parcel a specified distance from the initial dredging position by movement in the X-Y direction by means of the X and Y movement frames 53,54. Thereafter, dredging within one section is performed by repeating the procedure of vertical dredging by raising and lowering the twin-screw crushers 10 and 20 and horizontal movement dredging in the X and Y directions by the X and Y movement frames 53 and 54. continue.
In the dredging after the dredging in the section, the standing position of each support leg 66 is appropriately moved up and down according to the width of the excavated groove VH and the state of the bottom of the dam lake. That is, in FIG. 2, when the groove width of the excavated groove VH is narrow or when the groove width is widened, the bottom posture of the dredging shed 52 is stabilized according to the width of the excavated groove VH and the bottom condition of the dam lake. each support leg 66 to the ground.

By repeating the dredging procedure from the vertical dredging process to the horizontal dredging process while the attitude of the dredging station 50 is stable, dredging can be stably continued in one section. Furthermore, by adjusting the height of the dredging piles 52 by adjusting the lifting movement position of each support leg 66, and repeating the dredging procedure from the vertical dredging process to the horizontal dredging process, the above-described each process can dredging can continue.
Simultaneously with the excavation by the two twin-shaft crushers 10 and 20 described above, the dredging pump 30 is driven so that the excavated sediment is discharged from the drainage pipe 37 through the drainage hose 7 to a predetermined level at the bottom of the lake. 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 device 100 to perform XY dredging in the next section. Dredging is performed sequentially so as to scan the entire Y plane. In this manner, the dredging device 100 can continue dredging of sediment on the lake bottom SB of the dam lake in one section.

Movement on the XY plane in one section and dredging after movement may be automatically performed by a computer (the above management computer 9, controller 61, etc.), or an operator may check the status of the dredging station 50 on the lake. While monitoring from the water station 1, it may be performed manually by an operator.
As described above, according to the dredging station 50 and the dredging system using the dredging station 50 of the present embodiment, the dredging yagnes 52 are erected on the bottom SB of the dam lake with a plurality of support legs 66, and the dredging yagnes 52 are arranged vertically. And the twin shaft crushers 10 and 20 are installed slidable to the left and right, and the dredging pump 30 is installed on the upper part thereof, so that even if the lake bottom SB is rugged, The axial crushers 10 and 20 can be accurately followed and moved. Therefore, the sediments on the lake bottom SB can be efficiently crushed and dredged.

Further, according to the dredging station 50 and the dredging system using the dredging station 50 of the present embodiment, the dredging shed 52 is the wire 5 wound around the work machine 6 installed in the water station 1 provided on the water of the dam lake. Since the dredging station 50 is connected to the water station 1 via the , it is possible to reliably prevent the dredging station 50 from overturning regardless of the shape of the lake bottom SB.
It should be noted that the dredging device according to the present invention is not limited to the above-described embodiment, and various modifications are of course possible without departing from the gist of the present invention.
For example, in the dredging system of the first embodiment described above, the dredging system is transported by a vehicle such as a truck to the lake shore leading to the dam lake, and is transported by a work machine such as a crane to the target position of the SL on the dam lake. Although examples have been described, the dredging system according to the present invention can employ various transportation and mooring methods depending on the conditions of the dam lake. A second embodiment of the dredging system will be described below as another example of carrying out the transportation method and the mooring method according to the situation of the dam lake.

In the dredging system of the second embodiment, among the equipment necessary for the dredging system, the dredging station can be transported to the shore of the dam lake by a vehicle such as a truck, and the water station is described below. This is an example that can be transported in a divided state to be described. Further, in the second embodiment, the shore of the dam lake has a size that allows the water station and the dredging station to be loaded, and the slope of the lake shore from the loading place to the dam lake allows the water station and the dredging station to be safely moved. This example assumes a transportable state (for example, a gentle slope).

In contrast to the dredging system of the first embodiment, the dredging system of the second embodiment has a water station with a divided structure, wheels for sliding on the lakeshore slope, and a thruster for moving on the water, The difference is that the dredging station is equipped with a floating body capable of pouring water, wheels for gliding on the lakeside slope, and thrusters for moving on water. Since other configurations are the same as those of the first embodiment, the differences will be described below, and the same reference numerals will be given to the other configurations, and descriptions thereof will be omitted.
As shown in FIG. 9, in the dredging station 50B of the second embodiment, rectangular parallelepiped floating bodies 71 are attached to the left and right outer surfaces of the upper frame 51X, respectively. The float 71 is configured to allow the dredging station to be floated on water and submerged by water injection.

Two thrusters 73 are provided separately in the longitudinal direction of the floating body 71 on the outer surface of one floating body 71 (on the right side in the figure), and a towing part 74 is provided at the center position of the two thrusters 73. It is The dredging station 50B of the second embodiment can be propelled on the water by driving the two thrusters 73 when floating on the water.
Furthermore, four wheels 72 are provided on the side surface of the floating body 71 perpendicular to the surface on which the floating body 71 is mounted, at the four corners of the upper frame 51X. The four wheels 72 are rotatably supported by support shafts extending horizontally to the sides when all the support legs 66 are in the most shortened state, and the dredging station 50 is supported and towed. It is set up so that it can run.

On the other hand, as shown in FIG. 10, the water station 1B of the second embodiment has a body portion 4 and two connecting body portions 81 that are detachably connected to each other and can float on water. The state in which the body portion 4 and the two connecting body portions 81 are integrated has the same configuration as that of the water station 1 of the first embodiment.
The two connecting body portions 81 are cuboid connecting floating bodies that can be attached and detached at the attachment/detachment position indicated by reference numeral 81j, and are detachably attached to both ends of the right outer surface of the main body portion 4 in FIG. be. In the attached state, the upper and lower ends of the right outer surface of the main body 4 of the water station 1 in FIG. Defined as Bay DB. In addition, the main body part 4 also has a floating body, and the main body part 4 alone can be floated on the water.

A thruster 83 is provided on the right end face of each connecting body portion 81 in FIG. 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 part 81 and the main body part 4 are integrated.
In addition, in a state in which the connecting body part 81 and the main body part 4 are integrated, at the four corners of the front, back, left, and right side surfaces, the surfaces perpendicular to the surfaces on which the connecting body parts 81 are mounted are provided with four Wheels 82 are provided. The four wheels 82 are rotatably supported by supporting shafts extending horizontally to the sides, and can travel by being towed while supporting the water station 1B.

Thus, according to the dredging system of the second embodiment, the connected water station 1B and the dredging station 50B each have four wheels 82, 83, so that the connected water station 1B and While each dredging station 50B is supported by four wheels 82, 83, it is pulled by a wire using a winch or the like, and is slowly slid along the lakeshore slope, thereby easily transporting it to the top of the dam lake. be able to. Then, the floating station 1 equipped with the connecting floating body and the dredging station 50 can be brought into the dam lake in a floating state.

Since the water station 1B is provided with a docking bay DB, after it is carried onto the lake, the thrusters 73 of the dredging station 50B are driven to move it to the docking bay DB on the side of the water station 1B, as shown in FIG. The dredging station 50B can be accommodated (see FIG. 12) and can be moved and moored at a desired position on the lake SL together with the water station 1B.
Next, after mooring at the target position of the lake SL, as shown in FIG. 2, similarly to the first embodiment, the dredging station 50B can be suspended from the wire 5 of the working machine 6 and erected on the lake bottom SB of the dam lake.

Thus, according to the dredging system of the second embodiment, the dredging station 50B has the same configuration as that of the first embodiment. It can accurately follow the machine. Therefore, the sediment on the bottom of the lake can be efficiently crushed and dredged by the dredging pump. Since the water station 1B has the work machine 6 that can lift the dredging station 50B via the wire 5, it is possible to reliably prevent the dredging station 50B from overturning regardless of the shape of the lake bottom SB.
Here, in the dredging system described in Patent Document 1 described above, since it is necessary to lay a track on the buoyant body, there is a problem that the buoyant body also becomes large, and the device configuration on the buoyant body is complicated. , large-scale and complicated installation work is required. Furthermore, when the dredging system described in the document is brought in, there is a problem that a large truck, a trailer, a rough terrain crane, etc. are required in accordance with the increase in size.

On the other hand, in the dredging system of the second embodiment, the water station 1B has the connecting body part 81 and the main body part 4 that are detachably connected to each other. By separating the , it is possible to reduce the size during transportation, simplify the configuration of the device, and facilitate the installation work. Furthermore, when loading and unloading the dredging system, it can be loaded and unloaded without using a large rough terrain crane.
In addition, the dredging station 50B has a floating body 71 capable of floating the dredging station 50B on the water and submerging the dredging station 50B by water injection, and a thruster 73 capable of propelling the dredging station 50B on the water. 1B is equipped with thrusters 83 capable of propelling the surface station 1B above water, thus eliminating the need for other deployment equipment such as a towboat above water.

Further, in the dredging system of the present embodiment, the dredging station 1B has a plurality of wheels 72 and a tractor 74 provided on a plane perpendicular to the axle of the wheels 72. Therefore, a large rough terrain crane is not used, For example, the dredging station 1B can be carried out and carried in by pulling the dredging station 1B with a wire using a slope to the lake surface using a winch provided on a relatively small transport device such as a vehicle-mounted crane or a carrier car.
Similarly, the water station 1B also has a plurality of wheels 82 and a work machine 6 capable of winding the wire 5, so that the water station 1B itself can be pulled by the wire 5 to be carried out and carried in. . Therefore, with such a configuration, it is possible to assemble and carry in the device with a relatively small transport device, and it is also applicable to dams in mountainous areas with narrow roads and tunnels. In other words, in this example, the working machine 6 functions as a traction unit.

1 Water Station 2 Generator 3 Hydraulic Pump 4 Main Body 5 Wire 6 Work Machine (Tractor)
7 drain hose 8 umbilical cable 9 management computer (control means)
10 lower twin-screw 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-screw 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 Dredging pump 31 Pump driving part 32 Submersible motor 33 Drive shaft 34 Casing 35 Impeller 36 Suction port 37 Drain pipe 38 Case 39 Cabtyre cable 40 Suction hopper 41A , 41B bearing 42 shaft seal 44 scraper 45 frame (of the crusher) 46 control valve section 47 motor section 48 drive section 49
50 Dredging station 51 Platform 51X Upper frame 51Y Lower frame 51M Intermediate frame 52 Shed for dredging 53 X movement frame 53X X direction movement mechanism 54 Y movement frame 54Y Y direction movement mechanism 60 Control unit 61 Controller 66 Support leg 69 Jack mechanism 71 Floating body 72 Wheel 73 Thruster 74 Traction unit 80 Inertia sensor 81 Coupling unit 82 Wheel 83 Thruster 84 Traction unit 90 Elevating device 91 Elevating rack 92 Driving unit 100 Dredging device S Arrangement position M Relocation position

Claims (5)

A dredging pile erected on the bottom of a dam lake, a crusher mounted on the dredging pile to be slidable vertically and horizontally, and a dredging pump installed above the crusher. ,
The dredging yagura is
a platform having an upper frame, a lower frame, and an intermediate frame disposed between the upper and lower frames; a horizontal movement mechanism capable of moving the platform in at least one of the X and Y directions perpendicular to each other in the horizontal plane; a plurality of supporting legs provided on each frame and configured to be individually slidable relative to each other in the Z direction via a vertical movement mechanism, each supporting leg being grounded on the bottom of the dam lake;
The horizontal movement mechanism is
The intermediate frame and the upper frame are configured to be able to slide relative to each other in one direction through a horizontal movement mechanism of the X direction and the Y direction,
The intermediate frame and the lower frame are configured to be relatively slidable in another direction orthogonal to the one direction via a horizontal movement mechanism ,
The crusher is arranged in two stages, upper and lower, and is composed of two twin-screw crushers each having a pair of drum cutters,
The upper biaxial crusher is provided with a pair of drum cutters at a position facing the suction side of the dredging pump,
The lower twin-screw crusher has its own pair of drum cutters on the side opposite to the suction side of the dredging pump with respect to the pair of drum cutters of the upper twin-screw crusher,
The pair of drum cutters of the lower twin-shaft crusher has a raking function for raking the material to be dredged and a rough crushing function for roughly crushing the material to be dredged,
The dredging station is characterized in that the pair of drum cutters of the upper twin-screw crusher has a fine crushing function of crushing the material to be dredged after being coarsely crushed by the lower twin-screw crusher . A dredging station according to claim 1 and a water station provided on the water of a dam lake,
A dredging system, wherein said platform of said dredging station is connected to said water station via a wire wound around a working machine attached to said water station. The dredging station comprises a floating body capable of floating the dredging station on water and submerging the dredging station by water injection, and a thruster capable of propelling the dredging station;
The water station has a main body and a connecting body that are detachably connected to each other and can float on water, and a thruster mounted on the main body or the connecting body and capable of propelling the water station. ,
3. The dredging system of claim 2 , wherein said body portion and connecting body portion define a docking bay that when coupled together defines a docking bay capable of above-water accommodation of said dredging station. A dredging station and a water station provided on the water of the dam lake,
The dredging station includes a dredging pile erected on the bottom of the dam lake, a crusher mounted on the dredging pile so as to be slidable vertically and horizontally, and a dredging pile installed on top of the crusher. a pump, a floating body capable of floating the dredging station on water and submerging the dredging station by water injection, and a thruster capable of propelling the dredging station ;
The dredging yagnes are arranged in at least one of X and Y directions perpendicular to each other in a horizontal plane, with a platform connected to the water station via a wire wound around a work machine attached to the water station. and a plurality of support legs configured to be individually slidable relative to the platform in the Z direction via a vertical movement mechanism, and each support leg resting on the bottom of the dam lake. and
The water station has a main body and a connecting body that are detachably connected to each other and can float on water, and a thruster mounted on the main body or the connecting body and capable of propelling the water station. ,
A dredging system, wherein said body portion and connecting body portion, when coupled together, define a docking bay capable of receiving said dredging station above water. 5. The dredging system according to claim 3 or 4 , wherein the dredging station and the water station each have a plurality of wheels for traveling and a traction section provided in a plane perpendicular to the axle of the wheels.

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