JP7082912B2 - Dam dredging method - Google Patents

Description

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

In a general dam, dredging work for dredging mud, earth and sand, jade stones, gravel, sunken trees, etc. accumulated on the bottom of the dam lake is necessary to maintain the water storage capacity of the dam. In particular, in dams for hydroelectric power generation, dredging objects near the intake port become a problem, and dredging work near the intake port is carried out in a timely manner.
Conventional dam dredging methods include a dredging method using a grab ship that grabs and lifts the dredged material on the lake bottom with a grab bucket and loads it on a clay carrier, and a pump that sucks and sends mud from the dredged material on the lake bottom using a dredging pump. The dredging method of dam dredging is known.

In these dam dredging methods, workers with special skills are required for dredging work on grab boats and pump dredging boats, so securing workers and passing on the skills are problems. In addition, there is a problem that the dredging equipment including the dredging work boat must be transported by land and placed in the dam lake every time the dredging work is carried out.
For this reason, for example, Patent Document 1 proposes a fixed dam dredging method in which a dredged material such as earth and sand deposited on the bottom of a lake is transferred to a dumping site via a sand draining connecting pipe using a dredging pump. There is.

Japanese Unexamined Patent Publication No. 2012-193502 (paragraph 0018, FIG. 1-A)

However, in the fixed dam dredging method described in Patent Document 1, a sand drain pipe for pumping the dredged material from the bottom of the lake to the dumping ground from the dredging position where the dredging pump is installed and a sand removal pipe to be pumped from the bottom of the lake to the top of the lake are used. Since it is configured to have a sand drainage connecting pipe attached to the floater on the water for horizontal transportation on the water and a discharge part from the water to the bottom of the lake, the dredged material is once lifted to the top of the lake and then the sand removal connecting pipe on the lake. After that, sand will be discharged from the discharge section from the vicinity of the upper water surface of the dumping ground toward the dumping ground.
Therefore, it is necessary to raise the difference in the specific gravity between the dredged material and the water according to the height from the suction port of the dredged material to the water surface by the amount of raising the dredged material on the bottom of the lake to the water surface. Further, since the pipe length is also increased by that amount, there is a problem that the pressure loss is increased. In addition, since sand is discharged from the vicinity of the water surface of the dumping ground toward the bottom of the lake, which is the dumping ground, the diffusion of dredged material inside the lake water is remarkable, and there is a problem that the lake water is suspended.

Therefore, it is an object of the present invention to provide a dam dredging method capable of improving energy efficiency at the time of dredging and suppressing suspension of lake water in a dam lake due to dredging.

In order to solve the above problems, the dam dredging method according to one aspect of the present invention is characterized in that the dredged material is transferred from the dredged position on the bottom of the dam lake to the dumping ground on the bottom of the dam only through the lake water.
According to the dam dredging method according to one aspect of the present invention, the dredged material is transferred from the dredged position at the bottom of the dam lake to the dumping ground at the bottom of the dam only through the lake water. Compared to the conventional construction method, there is no need to raise the difference in specific gravity between the dredged material and water according to the height from the dredged material suction port to the lake, and the pipe length can be shortened accordingly, resulting in pressure loss. Can be reduced. Furthermore, the suspension of the lake water in the dam lake at the time of sand removal can be suppressed as compared with the case where sand is discharged from the vicinity of the water toward the dumping site at the bottom of the lake.

Here, in the fixed dam dredging method described in Patent Document 1, since the dredging pump is a fixed type, there is also a problem that only the lake bottom sediment can be dredged in a limited range.
On the other hand, in the dam dredging method according to one aspect of the present invention, a dredging device including a dredging yakura installed on the bottom of a dam lake and a pump mechanism for dredging slurry pumping installed in the dredging yakura. It is preferable to use a dredging station having a discharge pipe connected to the pump mechanism of the dredging device.

With such a configuration, the dredging yakura is erected on the bottom of the dam lake with multiple support legs, and the dredging pump mechanism is installed in the dredging yakura, so the dredging station can be installed and the dredging station can be installed. It is easy to move, and even on a rugged lake bottom, the pump mechanism can be arranged in a stable posture with respect to the shape of the lake bottom. Therefore, the degree of freedom in setting the dredging range is improved, and it is suitable for efficiently dredging the dredged material on the bottom of the lake.
Then, the dredging station is suspended at the dredging position on the bottom of the lake via a wire wound around a working machine installed on a ship on the lake, and the discharge pipe is laid along the bottom of the lake or its vicinity. It is preferable that the discharge port at the tip of the discharge pipe is arranged in the dumping ground at the bottom of the lake, and the dredged material at the dredging position collected by the pump mechanism is discharged to the dumping ground through the discharge pipe as a dredging slurry.

With such a configuration, the platform of the dredging station is connected to the ship on the lake via a wire wound around a working machine attached to the ship installed on the water of the dam lake, so what is the bottom of the lake? Even if the shape is large, the dredging station can be reliably prevented from tipping over. Therefore, it is more suitable for stably dredging the dredged material on the bottom of the lake with the dredging pump mechanism.
Further, it is preferable to use the dredging device which is installed in the frame of the dredging yakura so as to be vertically movable and slidable from side to side. With such a configuration, a pump mechanism that can move up and down and slide left and right is installed in the dredging yakura, which is more suitable for dredging a wide range of dredged objects such as mud and sediment accumulated on the bottom of the lake. be.

Further, in the dam dredging method according to one aspect of the present invention, the discharge pipe is attached to the flexible hose and the flexible hose at predetermined intervals so that the load at the time of pumping the dredged material is offset. It is preferable to use a floater having a plurality of floaters and a weight provided in the vicinity of the discharge port at the tip of the flexible hose.
Furthermore, with the discharge port at the tip of the flexible hose positioned in the dumping ground at the bottom of the lake, the pump mechanism is used to suspend and hold the discharge pipe with a wire wound around a work machine installed on a ship on the lake. It is preferable to discharge the dredged material including the sediment collected in the above as a dredged slurry to the dumping site.

In such a configuration, the discharge pipe from the pump mechanism is composed of a flexible hose, and floaters to the extent that the load at the time of pumping the discharge pipe is offset are attached to the flexible hose at predetermined intervals. Furthermore, since a weight is provided near the discharge port at the tip of the flexible hose, when the discharge pipe is extended along the bottom of the lake or its vicinity, the posture of the discharge pipe when it is extended is changed. It is more suitable for stabilizing. Therefore, if such a configuration is used, it is suitable as a dam dredging method capable of improving the energy efficiency at the time of dredging and suppressing the suspension of the lake water of the dam lake due to the dredging.

Further, in the dam dredging method according to one aspect of the present invention, the dredging device includes a crusher and the pump mechanism installed on the upper part of the crusher, and the crusher is arranged in two upper and lower stages. The upper twin-screw crusher is composed of two twin-screw crushers, each of which has a pair of drum cutters, and the upper twin-screw crusher is provided with a pair of drum cutters at positions facing the suction side of the pump mechanism. It is preferable to use a twin-screw crusher having its own pair of drum cutters on the side opposite to the suction side of the pump mechanism with respect to the pair of drum cutters of the upper-stage twin-screw crusher. ..

With such a configuration, even if the dredged material contains boulders or sunken trees, it is sucked as a dredging slurry by the pump mechanism for dredging installed by the crushing process by the two-stage crusher. -The dredged material can be crushed more reliably to the size that can be discharged. Therefore, it is more suitable as a configuration for reliably dredging while efficiently crushing the dredged material on the bottom of the lake.

As described above, according to the present invention, it is possible to improve the energy efficiency at the time of dredging and suppress the suspension of the lake water of the dam lake due to the dredging.

It is a schematic explanatory drawing which shows the 1st Embodiment of the dredging system used for the dredging method which concerns on one aspect of this invention. It is a schematic explanatory view which shows one embodiment of the dredging station used for the dredging method which concerns on one aspect of this invention, FIG. It is a schematic perspective view which shows one Embodiment of the dredging station used in the dredging method which concerns on one aspect of this invention. It is a schematic plan view of the platform which constitutes the dredging station. It is a schematic front view of the platform which constitutes the dredging station. It is a schematic plan view of the intermediate frame of the platform. It is a front view which shows one Embodiment of the dredging apparatus equipped in the dredging station used in the dredging method which concerns on one aspect of this invention. It is a side view which shows one Embodiment of the dredging apparatus used in the dredging method which concerns on one aspect of this invention. It is a figure explaining the procedure of laying the discharge pipe in the lake water in the dredging system of 1st Embodiment. It is a figure explaining the procedure of laying the discharge pipe in the lake water in the dredging system of 1st Embodiment. It is a figure explaining the procedure of laying the discharge pipe in the lake water in the dredging system of 1st Embodiment. It is a figure which shows the example of the arrangement of the dredging system of the water pressure feeding, which is the example of the lift comparison in the case of the water pressure feeding. It is a schematic explanatory drawing which shows the 2nd Embodiment of the dredging station used in the dredging method which concerns on one aspect of this invention. It is a schematic explanatory drawing which shows the 3rd Embodiment of the dredging station used in the dredging method which concerns on one aspect of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The dam dredging method of the present embodiment provides a dredging system including a dredging station that is erected on the bottom of the dam lake and dredged while excavating a dredged object, and a ship that is placed on the lake of the dam lake. This is an example of using and dredging.
The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings. Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified in the following embodiments.

First, the overall configuration of the dredging system of the first embodiment will be described with reference to FIG.
In the figure, the dam body D is provided on the right side of the figure, and the intake facility G having the intake port W is provided in the appropriate place of the dam on the left side of the figure. A dustproof buoy, a screen, and the like are provided on the front surface of the gate of the water intake facility G. The water taken in by the water intake facility G is sent to a power generation facility (not shown).
As shown in the figure, this dredging system is the relocation position of the ship 1A located on the SL above the dam lake, the dredging station 50 erected on the bottom SB of the dam lake, and the bottom SB that serves as a dumping ground. It is equipped with a support ship 1B placed on the SL on the lake of M. The dredging station 50 of the present embodiment is equipped with a dredging device 100.

In the dredging system of the present embodiment, the dredging station 50 is arranged at the dredging position S near the water intake facility G, and the dredging slurry (dredging object) dredged by the dredging device 100 is arranged with the dredging station 50. It is configured to transfer from the position S to the relocation position M in the water at or near the bottom of the lake via the discharge pipe 7 extending into the water only through the lake water.
Specifically, in the example of the present embodiment, the ship 1A is anchored at a target position in the vicinity of the water intake facility G on the lake SL. The ship 1A of the present embodiment also serves as a mother ship for placement for transporting (transferring underwater) the dredging station 50 in a state of being suspended from the SL on the lake and erection on the bottom SB of the dam lake.

The ship 1A includes a working machine 6A including a winch, a crane, etc. for erection of the dredging station 50 on the bottom SB of the dam lake, a generator 2, and a variable capacity type hydraulic pressure driven by an internal combustion engine as a hydraulic source. It is equipped with a pump 3 and a management computer 9 that constitutes a control means.
The ship 1A transports the dredging station 50 to a predetermined position on the dam lake by towing or self-propelled on the water, and the dredging station 50 is hung down by the wire 5A of the working machine 6A and erected at the dredging position S of the lake bottom SB. In the ship 1A of the present embodiment, a moon pool 4 m is formed on the floating body main body 4, and the dredging station 50 is moved up and down through the moon pool 4 m so that the dredging station 50 can be held in a stable posture. It can be moved up and down.

The management computer 9, the generator 2, and the hydraulic pump 3 are connected to the dredging station 50 arranged at the dredging position S of the lake bottom SB via the umbilical cable 8, and the dredging station 50 and the dredging device 100 are connected from the ship 1A side. It is possible to supply electric power and control signals required for operation as well as hydraulic oil.
The umbilical cable 8 has a hybrid structure in which each hydraulic hose 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). .. In addition, each hydraulic hose for supply and discharge, a power cable, and a signal cable may be individually wired and piped.

The support vessel 1B is a relatively small vessel that performs the work of extending the discharge pipe 7 into the water and is anchored at the lake SL at the relocation position M to provide support for performing the necessary monitoring work.
The support vessel 1B of the present embodiment includes a working machine 6B including a winch, a crane, etc. for extending the discharge pipe 7 to the bottom SB of the dam lake, necessary equipment such as a generator (not shown), and the necessary equipment (not shown). Is equipped.
As a result, the support vessel 1B of the present embodiment transports the discharge pipe 7 in a state of hanging from the lake SL while hanging the discharge pipe 7 with the wire 5B of the work machine 6B (transfer in water). Then, with respect to the bottom SB of the dam lake, the discharge port at the tip of the discharge pipe can be extended to the relocation position M, which is the dumping ground of the lake bottom, with the discharge pipe 7 crawling along the bottom of the lake or its vicinity.

As shown in FIG. 1, the discharge pipe 7 of the present embodiment extends the flexible hose 7a, which is the main body of the discharge pipe, and the flexible hose 7a so that the load at the time of dredging slurry pumping of earth and sand is offset. It is configured to have a plurality of floaters 7b mounted at predetermined intervals in the existing direction, and a weight 7c provided near the discharge port at the tip of the flexible hose 7a. In the example of this embodiment, the tip of the wire 5B is fixed to the weight 7c.

Next, the dredging station 50 will be described in detail with reference to FIGS. 2 to 6 as appropriate. The dredging station 50 is a self-propelled dredging machine for dredging the bottom of a dam lake, which comprises the dredging device 100 and a dredging Yakura 52 capable of self-driving in the X and Y directions.
As shown in FIG. 2B, the dredging station 50 is a dredging device 100, which is a dredging machine 10 and 20 and a dredging slurry pump mechanism provided above the crushers 10 and 20. It is equipped with a dredging pump 30, and the dredging material of the lake bottom SB is excavated by the crushers 10 and 20 and dredged together with muddy water by the dredging pump 30 for the bottom SB of the dam lake where the dredging material is accumulated. It is configured so that dredged objects that have been made into slurries can be dredged.

Specifically, as shown in FIG. 2, the dredging station 50 of the present embodiment has a platform 51 having a plurality of rectangular frames and a plurality of supporting the four corners of the upper and lower frames constituting the platform 51 (8 in this example). It is provided with a dredging Yakura 52 having a support leg 66 of the leg) and a jack mechanism 69. Each support leg 66 is fixed to the platform 51 so as to be able to move up and down via a jack mechanism 69.
The platforms 51 constituting the dredging Yakura 52 include an upper frame 51X having a rectangular frame shape in a plan view, a lower frame 51Y having a rectangular frame shape in a plan view, and both platforms 51X and 51Y. It has an intermediate frame (Middle frame) 51M which is provided in the middle of the above and has a rectangular frame shape in a 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 supported on the upper surface of the upper frame 51X via the moving mechanism 53X for the X direction. The X-direction moving mechanism 53 has a motor, a deceleration mechanism, and a rack and pinion mechanism (not shown), and by driving the rack and pinion mechanism via the deceleration mechanism by the motor, the two X moving frames 53 are combined with the upper frame. It is possible to slide and move in the X direction at the same time along 51X.

A Y moving frame 54 is stretched and placed on the upper part of the two X moving frames 53. 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 the Y direction feeding 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 the dredging device 100 is driven by the motor via the deceleration mechanism to drive the dredging device 100 to the X moving frame 53. It can be slid along the extending direction (that is, along the Y direction).
Further, the dredging device 100 is provided on the lower surface of the Y moving frame 54 and is supported so as to be able to move up and down via an elevating device 90 constituting the Z-direction feed mechanism of the dredging device 100, and is supported from the lower surface of the Y moving frame 54. Arranged in a suspended position.

The elevating device 90 includes a pair of left and right drive units 92 provided on the side portions of the Y moving frame 54, and an elevating rack 91 erected in a posture vertically inserted with respect to each drive unit 92. .. The drive unit 92 has a motor, a deceleration mechanism, and a rack and pinion mechanism that mesh with the elevating rack 91 (not shown), and the dredging device 100 is driven by the motor to drive the rack and pinion mechanism via the deceleration mechanism. It can be slid along the elevating rack 91 (that is, along the Z direction).
Further, a control unit 60 is provided on the upper part of the Y moving frame 54. The umbilical cable 8 is connected to the control unit 60.

As shown in FIG. 3, the control unit 60 is a controller 61 which is a control unit that controls the operation of the entire dredging station 50 including the walking operation of the dredging Yakura 52 in order to drive the dredging station 50 and the dredging device 100. Is built-in.
As a result, the dredging station 50 receives the necessary pressure oil from the ship 1A via the umbilical cable 8 and the 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 the command of the management computer 9 on the ship 1A side.

Next, the horizontal movement mechanism of the dredging station 50 will be described in detail with reference to FIGS. 4 to 6. In addition, FIGS. 4 to 6 show the bottoming preparation posture of the dredging yakura 52 when the dredging station 50 is landed on the bottom SB of the dam lake from the ship 1A, and the dredging yakura 52 arrives. In the bottom preparation posture, the centers (centers of gravity) G of the upper frame 51X, the intermediate frame 51M, and the lower frame 51Y in the horizontal plane coincide with each other. In FIG. 5, reference numeral CL indicates a central axis of each support leg 66.
As shown in FIG. 4, the upper frame 51X is separated from a pair of vertical girders Xb having a rectangular frame shape in a plan view and having a rectangular tubular shape provided in parallel with each other in the X direction and separated in the Y direction. It has a pair of horizontal girders Xa forming a rectangular cylinder provided in parallel with each other. On each outer surface of the two lateral girders Xa, X moving racks Rx are attached symmetrically from the center along the extending direction of the lateral girder Xa.

Further, as shown in the figure, the lower frame 51Y has a pair of horizontal girders Yb having a rectangular frame shape in a plan view and having a rectangular tubular shape provided in parallel with each other separated in the X direction, and the lower frame 51Y in the Y direction. It has a pair of vertical girders Ya forming a rectangular cylinder that are separated and provided in parallel with each other. On the outer surface of the two vertical girders Ya, Y moving racks Ry are attached symmetrically from the center along the extending direction of the vertical girders Ya.
As shown in FIG. 6, the intermediate frame 51M is separated from a pair of vertical girders Mb having a rectangular frame shape in a plan view and having a rectangular tubular shape provided in parallel with each other in the X direction and separated in the Y direction. It has a pair of horizontal girders Ma that form a rectangular cylinder and are provided in parallel with each other.

The X drive motor Mx is arranged in the rectangular cylinder of the horizontal girder Ma at the center position of each horizontal girder Ma of the intermediate frame 51M in the extending direction. Further, at the center position of each vertical girder Mb of the intermediate frame 51M in the extending direction, the Y drive motor My is arranged in the rectangular cylinder of the vertical girder Mb.
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 raising and lowering each support leg 66. The intermediate frame 51M and the upper and lower frames 21X and 21Y are supported by a linear motion guide mechanism (not shown) so as to be slidable, and are engaged with each other via a rack and pinion mechanism. It is configured to be slidable relative to the direction and the Y direction.

More specifically, the dredging Yakura 52 has support legs 66 at each of the four corners of the rectangular frame of the upper frame 51X and each of the four corners of the rectangular frame of the lower frame 51Y, as shown in FIG. .. Each support leg 66 is provided with a jack mechanism 69, which is a slide moving mechanism in the Z direction, as a jacking unit for raising and lowering.
The jack mechanism 69 is equipped with two jack mechanisms, one on each side of each support leg 66, and each support leg 66 has a Z-moving rack Rz as a shaft of each support leg 66, as shown in FIG. They are mounted at positions facing each other in the circumferential direction along the direction.

The jack mechanism 69 has a motor (not shown), a reduction mechanism, and a rack and pinion mechanism (not shown). The rack is formed along the axial direction of the support legs 66. The jack mechanism 69 is capable of sliding the support legs 66 in the vertical direction (Z direction) and holding the moving position by driving the rack and pinion mechanism via the deceleration mechanism with a motor.
The motor for driving the jack mechanism 69 may be driven by fluid pressure (for example, hydraulic drive) or electric power (for example, electromagnetic motor) (hereinafter, other driving motors). Same as above).

The jack mechanism 69 corresponding to each Z-moving rack Rz has a Z-driving motor (not shown), a pinion mounted on the output shaft of the Z-driving motor, and the Z-moving rack Rz meshed with the pinion. A rack and pinion mechanism is configured. As a result, each support leg 66 slides relative to the upper and lower frames 21X and 21Y to which it is mounted in the Z direction, and the cooperation of the plurality of support legs 66 causes the upper and lower frames 21X and 21Y to slide and move. It is possible to go up and down.
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 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 lateral girder Ma of the intermediate frame 51M. Further, a holding claw (not shown) is attached at the same position as the bearing plate so as to cover the skidding rail from the left and right. The holding claw supports the skiding 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-moving pinion (not shown) is mounted on the drive shaft of the X-driving motor Mx and projects to a position facing the rack surface of the X-moving rack Rx. The X-moving pinion is meshed with the X-moving rack Rx and is synchronously driven by the X-driving motor so that the upper frame 51X can be slidably moved 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 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 the bearing plate guides the skiding rail up and down. In addition, holding claws are attached at the same position as the bearing plate so as to cover the skidding rails from the left and right, and when the lower frame 51Y moves in the Y direction, the skidding rails are placed on both sides to prevent the skid rails from falling. Support from.

A Y-moving pinion Py is mounted on the drive shaft of the Y-driving motor My, and projects to a position facing the rack surface of the Y-moving rack Ry. The Y-moving pinion Py is meshed with the Y-moving rack Ry, and is synchronously driven by the Y-driving motor My, so that the lower frame 51Y can be slidably moved in the Y direction.
The intermediate frame 51M of the dredging Yakura 52 and the upper and lower frames 51X and 51Y show an example in which they can be moved in the horizontal direction via the rack and pinion mechanism, but the moving mechanism of the dredging Yakura 52 is the same. Various moving mechanisms can be adopted as long as the moving mechanism is not limited and can move in the horizontal direction.

For example, a moving mechanism that slides in a hydraulic cylinder system can be used. Similarly, each support leg 66 shows an example in which relative slide movement in the Z direction is possible via a rack and pinion mechanism, but the present invention is not limited to this, and for example, a movement mechanism that slides by a hydraulic cylinder method may be used. can. Further, the driving is not limited to the hydraulic drive, and an electric drive type may be used.
Further, in the dredging station 50, under the control of the management computer 9, the dredging device 100 is driven in the X direction and in 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, by driving the dredging pump 30, the muddy water taken in together with the dredged material can be discharged from the discharge pipe 7 as a high-pressure dredging slurry.

As a result, the dredging station 50 is subjected to walking control processing by a horizontal slide moving mechanism that slides the upper and lower frames 21X and 21Y in the X and Y directions, and a slide moving mechanism that slides each support leg 66 in the Z direction. According to the procedure, the planned dredging area is walked in the X direction and the Y direction by the dredging Yakura 52, and the dredging device 100 is moved in the X direction and the Y direction, so that the predetermined sections can be dredged in sequence.
Here, in 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 the present embodiment, as shown in FIG. 3, the control unit 60 has an inertia sensor 80 as a posture detecting sensor for detecting the posture of the platform 51 of the dredging Yakura 52 at any time.

Further, in the present 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 & pinion mechanism of each corresponding jack mechanism 69. Each torque detector detects the motor torque of each drive motor at any time, and can 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 the attitude control process, and includes a walking control process of the dredging Yakura 52, an attitude control process of the dredging Yakura 52, a dredging control process of the dredging station 50, and other necessary matters. Perform various processes.

When the attitude control process of the dredging station 50 is executed, the controller 61 determines the degree of the attitude imbalance of the dredging station 50 itself based on the output of the inertial sensor 80, and determines the degree of the attitude imbalance of the jack mechanism 69 of the rack and pinion mechanism. Attitude stability control to maintain attitude 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 the soft ground deposited on the bottom of the dam lake, slopes and undulations, and walks on the bottom of the lake where large gravel and sunken trees are piled up. The dynamic attitude change caused by the collapse of the sunken tree is measured by the inertial sensor 80 including the accelerometer and the angular accelerometer such as the gyroscope.

An inclination sensor for measuring a static posture can also be used. Further, for attitude control, a thruster or a water jet may be used to control the attitude to maintain stability. The controller 61 adjusts the leg length of each support leg 66 so that the posture of the dredging station 50 becomes horizontal based on the posture detection information of the inertial sensor 80. As a result, the dredging station 50 can land on the bottom of the dam lake in a stable posture.

Next, the dredging device 100 equipped in the dredging Yakura 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 has a rectangular frame-shaped housing 38, and a dredging pump 30 and two units provided inside the frame of the housing 38. The shaft crushers 10 and 20 are provided.
The two twin-screw crushers 10 and 20 are provided on the side of the suction port 36 of the dredging pump 30, and are arranged in two upper and lower stages along the longitudinal direction of the housing 38. As shown in FIG. 3, the upper portion of the housing 38 is supported at the position of the lower surface of the Y moving frame 54 so as to be able to move up and down via the lifting device 90, and is driven by the lifting device 90 to the left and right lifting racks 91. It can be slid along in the Z direction.

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

In the drive shaft 33 of the submersible motor 32, the upper and lower parts of the drive shaft 33 are rotatably supported by bearings 41A and 41B, and the lower end of the drive shaft 33 projects downward from the center of the upper part of the casing 34. In the casing 34, the impeller 35 is coaxially mounted on the tip of the drive shaft 33. Between the pump drive unit 31 and the casing 34, a shaft seal portion 42 such as a mechanical seal or an oil seal is provided at a position around the drive shaft 33 of the submersible motor 32.
As a result, 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 vortex in the casing 34, and the amount of pump drainage from the suction hopper 40 facing the lake bottom side. The muddy water is sucked together with the crushed dredged material, and can be discharged from the suction port 36 to the discharge pipe 38 via the discharge pipe 37.

The two twin-screw crushers 10 and 20 of the present embodiment employ a twin-screw crusher that crushes by a slit cutter method, respectively.
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 having a function of scraping a dredged object such as gravel and a sunken tree and a function of rough crushing. On the other hand, the upper twin-screw crusher 20 has a fine crushing function by a twin slit cutter that crushes the pair of drum cutters 22 and 23 to a size smaller than a predetermined size.

Specifically, as shown in FIG. 8, the lower biaxial crusher 10 has two horizontal rotating shafts in a pair parallel to each other in the lower portion of the frame 45 at the lower end of the housing 38 in a raised position. 14 and 15 are supported by the frame 45, respectively, and a pair of columnar drum cutters 12 and 13 are mounted on the horizontal rotation shafts 14 and 15, respectively. The tips of both rotating shafts 11 and 12 are rotatably supported by the frame 45 via bearings 19. A hydraulic motor 11 for rotationally driving both rotary shafts 11 and 12 is mounted on the base end portions of the hollow cylindrical rotary shafts 11 and 12.

In each of the pair of drum cutters 12 and 13, a plurality of crushing blades 16 are alternately fitted at regular intervals via an annular spacer 17 in a state of close contact in the axial direction, and are fixed by a fixing key 18. The crushing blade 16 has a substantially disk shape, and a plurality of claws are provided on the outer peripheral portion thereof at regular intervals. The pair of drum cutters 12 and 13 are arranged side by side in a horizontal posture 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 shear the dredged material scraped into the frame 45 by the rotational drive of both rotating shafts 11 and 12 at the portion where the crushing blades 16 of both shafts mesh with each other. It is designed to be crushed by the slit cutter method. As a result, both crushing blades 16 have an action of scraping the dredged object at the time of forward rotation and an action of approaching the outer peripheral surfaces of the opposing spacers 17 so as to be in sliding contact with each other and crushing the dredged object by a shearing action. The dredged material is scraped from below the casing by the double crushing blades 16 and is crushed by the shearing action of the slit cutter while moving toward the upper upper twin-screw crusher 20.

Similarly, in the upper biaxial crusher 20, two horizontal rotating shafts 24 and 25 forming a pair parallel to each other are supported by the frame 45 on the upper stage in the frame 45, and each horizontal rotating shaft 24 is supported. , 25 are fitted with a pair of columnar drum cutters 22, 23. The tips of both rotating shafts 21 and 22 are rotatably supported by the frame 45 via bearings 29. A hydraulic motor 21 for rotationally driving both rotary shafts 21 and 22 is mounted on the base ends of the hollow cylindrical rotary shafts 21 and 22.
Then, the pair of drum cutters 22 and 23 constantly shear the dredged material scraped into the frame 45 by the rotational drive of both rotating shafts 21 and 22 at the portion where the crushing blades 26 of both shafts mesh with each other. It is designed to be crushed by the slit cutter method.

As a result, both crushing blades 26 have an action of scraping the dredged object at the time of forward rotation and an action of approaching the outer peripheral surfaces of the opposing spacers 27 so as to be in sliding contact with each other and crushing the dredged object by a shearing action. The dredged object is scraped from below the casing by both crushing blades 26, and is crushed by the shearing action of the slit cutter while moving toward the suction hopper 40 of the upper 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 are roughly crushed (primary crushing) 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. 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 less than a predetermined size. ing.

As shown in FIG. 7, the pair of drum cutters 22 and 23 of the upper twin-screw crusher 20 are provided with a scraper 44 at a position facing the crushing blade 26 and the spacer 27. The scraper 44 is arranged so as to project 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 dredged object sandwiched between the crushing blades 26 of the pair of drum cutters 22 and 23. It is supposed to take.
Here, the lower twin-screw crusher 10 of the present embodiment is configured so that the rotation speed and rotation direction of the horizontal rotary shafts 14 and 15 can be changed, and the upper twin-screw crusher 20 has the horizontal rotary shaft 24, It is configured so that the rotation speed and the rotation direction of the 25 can be changed.

Specifically, each drive unit of the two twin-screw crushers 10 and 20 of the present embodiment is variable as a drive motor for driving the pair of drum cutters 12, 13 and 22, 23, as shown in FIG. It is provided with capacity type hydraulic motors 11 and 21, respectively.
Each hydraulic motor 11 and 21 is provided with a swash plate (not shown), and by tilting the swash plate, the flow direction of the pressure oil to be discharged can be changed and the discharge flow rate of the pressure oil can be changed. There is. Further, torque control is possible by controlling the pressure of the pressure oil supplied from the hydraulic pump 3 side of the ship 1A, and output (rotational speed) control is possible by controlling the flow rate supplied from the hydraulic pump 3 side. It is possible.

As a result, in the two twin-screw crushers 10 and 20 of the present embodiment, when a dredged object having a large crushing resistance is squeezed, the rotation speed is automatically reduced and the output torque required for crushing is increased. When a dredged object that is controlled to be large and has a small crushing resistance is squeezed in, the rotation speed automatically increases, and each hydraulic motor increases the rotation speed while maintaining the output torque required for crushing. 11 and 21 are controlled by constant horsepower.

Next, a procedure for laying the discharge pipe 7 in the lake water by a dredging system including the above-mentioned dredging station 50, the vessel 1A and the support vessel 1B, and a procedure for dredging an object as a dredging slurry from the bottom SB of the dam lake. , And the action and effect of the dam dredging method by this dredging system and the dredging device 100 will be described.
First, when the discharge pipe 7 is laid in the lake water, as shown in FIG. 9, the ship 1A and the support ship 1B in a state of accommodating the dredging station 50 are anchored at predetermined positions on the lake, respectively. At this time, the vessel 1A is anchored at the target position of the dredging position S on the lake SL, and the support vessel 1B is anchored at the target position of the relocation position (soil dump) M on the lake SL.

When the ship 1A and the support ship 1B are arranged at predetermined positions on the lake, at the same time, as shown in the figure, the discharge pipe 7 is extended while floating on the lake between the ship 1A and the support ship 1B. At this time, the discharge pipe 7 is emptied inside and a plurality of floaters 7b are mounted at predetermined intervals, so that the discharge pipe 7 can be easily stretched on the lake in a stable posture.
In the discharge pipe 7 floating on the lake, the base end of the flexible hose 7a is connected to the dredging pump 30 installed inside the dredging station 50, and the tip of the flexible hose 7a to which the weight 7c is attached is the tip of the flexible hose 7a. , It is connected to the wire 5B connected to the winch equipped on the working machine 6B of the support ship 1B for guiding the discharge pipe 7.

Next, the dredging pump 30 is started in the state shown in the figure, and the lake water is injected into the flexible hose 7a to fill the inside of the flexible hose 7a. As a result, the discharge pipe 7 as a whole is in a neutral buoyancy state, and the underwater posture is stabilized.
Next, as shown in FIG. 10, by driving the winch equipped on the working machine 6A of the ship 1A, the dredging station 50 is suspended in the water by the wire 5A and lowered into the water, and is lowered to the working machine 6B of the support ship 1B. By driving the equipped winch, the tip of the flexible hose 7a with the weight 7c is lowered into the water while maintaining the horizontal posture with the wire 5B. At this time, since the entire discharge pipe 7 is in a neutral buoyancy state, it can be lowered while stabilizing the underwater posture when it is lowered into the water while being suspended.

After that, as shown in FIG. 11, the crane installed on the support vessel 1B is used while the dredging station 50 is lowered toward the dredging position S on the bottom of the lake by using a working machine 6A such as a crane installed on the vessel 1A. Using a working machine 6B such as the above, the flexible hose 7a is suspended by the wire 5B until the tip of the flexible hose 7a reaches the upper part of the relocation position (soil dump) M.
Next, the dredging station 50 is landed at the dredging position S in the water, and the dredging station 50 is installed at the dredging position S of the bottom SB of the dam lake so as to have the arrangement shown in FIG. Further, the support ship 1B hangs the discharge pipe 7 from the lake SL while hanging the discharge pipe 7 with the wire 5B of the work machine 6B, and as shown in FIG. 1, the lake bottom SB of the dam lake. The discharge pipe 7 is extended to the relocation position (soil disposal site) M.

In the present embodiment, in order to suppress the lift of the specific gravity difference according to the height of the dredged object and the water as much as possible, the discharge pipe 7 is crawled along the lake bottom SB or its vicinity with respect to the lake bottom SB of the dam lake. In this state, the discharge port at the tip of the discharge pipe is extended to the relocation position M, which is the dumping ground at the bottom of the lake.
When the dredging station 50 is in operation, the dredging station 50 and the dredging device 100 are driven by supplying the pressure oil required for the controller 61 from the ship 1A via the umbilical cable 8 as well as electric power and control signals.

As a result, according to the dredging station 50 of the present embodiment, the excavated dredging material is sucked together with muddy water to form a dredging slurry, and the dredging slurry is moved from the dredging position S of the dredging station 50 to the bottom of the lake or its vicinity in water. It can be transferred only through the lake water to the relocation position M, which is the dumping ground at the bottom of the lake, via the discharge pipe 7 arranged in a state of crawling along the surface.
More specifically, when the controller 61 of the dredging station 50 receives a dredging start command from the management computer 9, a predetermined area inside the intermediate frame 51M is dredged by 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, the dredging is started in a state where the vertical posture of the dredging device 100 with respect to the platform 51 is surely held. The dredging device 100 excavates the bottom SB of the dam lake into a substantially rectangular cross section by the movement of a pair of 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 pipe 7 as a high-pressure dredging slurry. After dredging, an excavation ditch VH is formed in the ground in "one section".
Here, in the bottom SB of the dam lake, it is necessary to deal with the soft ground, slopes and undulations deposited on the bottom of the lake. On the other hand, according to the present embodiment, since each support leg 66 can be raised and lowered individually, the dredging device 100 is perpendicular to the dredging Yakura 52 while dealing with the soft ground, slopes and undulations deposited on the bottom of the lake. Stable excavation is possible while maintaining the posture.

In the dredging device 100, when the two-screw crushers 10 and 20 are used, the crushing blades provided on each shaft and meshing with each other rotate inward (normal rotation). That is, both axes of the pair of crushing blades facing each other rotate in opposite directions. When the dredged material is scraped into the frame 45 by the lower twin-screw crusher 10, a pair of crushing blades of the lower twin-screw crusher 10 primaryly 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 upper and lower stages, and the pair of drum cutters of the lower two-screw crusher 10 are gravel, sunken trees, 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 smaller than a predetermined size. Even if the object contains gravel or sunken trees, the dredged object can be reliably crushed to a size that can be sucked and discharged by the dredging pump 30 installed in the upper part of the upper twin-screw crusher 20. Therefore, it is excellent in preventing or suppressing clogging of the dredging pump 30.

Next, the dredging device 100 is moved in the X to Y direction by the X and Y moving frames 53 and 54, so that the dredging device 100 is moved within one section by a specific distance from the first dredging position. After that, dredging in one section is performed by repeating the procedure of dredging by raising and lowering the twin-screw crushers 10 and 20 and horizontal movement dredging in the X to Y directions by the X and Y moving frames 53 and 54. You can continue.
In the dredging after the dredging in the section, the position where each support leg 66 is erected is appropriately raised and lowered according to the width of the excavation ditch VH and the bottom condition of the dam lake. That is, in FIG. 2, when the groove width of the excavation ditch VH is narrow or widened, the landing posture of the dredging Yakura 52 is stabilized according to the width of the excavation ditch VH and the bottom condition of the dam lake. Each support leg 66 is grounded.

Then, by repeating the dredging procedure from the dredging step to the horizontal dredging step in a state where the posture of the dredging station 50 is stable, the dredging within one section can be stably continued. Further, by adjusting the height of the dredging Yakura 52 according to the elevating motion position of each support leg 66 and repeating the dredging procedure from the dredging process to the horizontal dredging process, the height is one step lower in each process described above. Dredging can be continued.
Then, at the same time as excavation by the two twin-screw crushers 10 and 20 described above, the dredging pump 30 is driven to drive the dredging slurry of the excavated dredging material from the drain pipe 37 via the discharge pipe 7. It can be continuously moved to a predetermined relocation position M on the bottom of the lake.

The dredging station 50, after dredging to the maximum dredging depth of the dredging device 100 in one section, retracts the dredging device 100, moves the dredging station 50 itself in the XY plane, and moves the dredging station 50 itself in the XY plane to perform XY 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, the dredging of the dredged material can be continued at the bottom SB of the dam lake in one section.
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, etc.), or the operator can check the situation of the dredging station 50 on the lake. It may be performed manually by the operator while monitoring from the ship 1A.

As described above, according to the dam dredging method of the present embodiment, the dredging slurry is transferred from the dredging position S of the bottom SB of the dam lake to the relocation position M which is the dumping ground of the bottom SB, so that the pipe is watered. Compared to the conventional dredging method in which the dredged material is lifted up to and pumped up, it is not necessary to raise the difference in specific gravity between the dredged material and water according to the height from the suction port of the dredged material to the lake, and the pipe length can be shortened accordingly. .. Therefore, it is possible to reduce the pressure loss during dredging slurry pumping of earth and sand. Further, the suspension of the lake water at the time of sand discharge can be suppressed as compared with the case where sand is discharged from the vicinity of the water toward the bottom of the dump.

Here, as a comparison of the total head in the case of underwater pumping in the dam dredging method of the present embodiment (see FIG. 1) and in the case of water pumping (see FIG. 12), the piping resistance according to the Hazen Willams equation and The calculation results of the total head are also shown in Table 1. This example is a comparison result when the vertical distance from the suction port of the discharge pipe 7 to the lake water is 50 m, the horizontal distance of the discharge pipe 7 is 700 m, and the nominal diameter of the pipe is 200 A.
hf = 10.67 ・ L ・ Q ^1.85 / C ^1.85・ d ^4.87
However, hf: pressure loss at the pipe length L (m), L: pressure loss at the pipe length L (m), Q: flow rate (m ³ / s), d: inner diameter of the pipe (m), C. : Flow coefficient.

In this case, as shown in Table 1, in the case of the water pumping shown as a comparative example in FIG. 12, the total head is 29.9 m, whereas in the case of the underwater pumping in the dam dredging method of the present embodiment. The total head is 18.6m. Therefore, according to the dam dredging method of the present embodiment, it can be seen that the total head can be significantly reduced by underwater pumping. As described above, according to the dam dredging method of the present embodiment, it is possible to significantly reduce energy during sediment pumping.

In order to suppress the lift of the specific gravity difference according to the height of the dredged object and water, it is desirable to extend the discharge pipe 7 along the lake bottom SB, but it depends on the state of the lake bottom SB. May be in a state of crawling along the vicinity of the lake bottom SB. In addition, if it is difficult to crawl along the vicinity of the bottom SB depending on the situation, if it is piped so that it can be transferred only through the lake water, it will be located below the surface of the lake at a higher position than the bottom SB or its vicinity. Plumbing is acceptable.
Further, it is preferable that the discharge pipe 7 directly transfers the dredged material from the dredged position S of the lake bottom SB to the relocation position M which is the dumping ground only through the lake water, but the dredged material is not limited to this and is transferred only through the lake water. For example, if the extension distance is long, a relay point may be provided in the middle of the discharge pipe 7. An auxiliary pump may be provided at the relay point.

Here, the discharge pipe 7 of the present embodiment includes a flexible hose 7a, a plurality of floaters 7b mounted at predetermined intervals in the extending direction of the flexible hose 7a, and discharge of the tip of the flexible hose 7a. Since a weight 7c provided near the outlet is used, the discharge pipe 7 is crawled along the bottom of the lake or its vicinity with respect to the bottom SB of the dam lake, and the discharge port at the tip of the discharge pipe is used. When the hose is extended to the relocation position M, which is the dumping ground on the bottom of the lake, the posture of the discharge pipe at the time of the extended arrangement can be stabilized.
In particular, in the present embodiment, when the lake water is injected into the flexible hose 7a and the lake water is filled inside the flexible hose 7a, the buoyancy is set so that the entire discharge pipe 7 is in a neutral buoyancy state. Therefore, it is suitable for stabilizing the underwater posture.

Further, according to the dredging station 50 adopted in the dam dredging method of the present embodiment and the dredging system using the dredging station 50, the dredging Yakura 52 is erected on the bottom SB of the dam lake with a plurality of support legs 66. The dredging yakura 52 is equipped with two-screw crushers 10 and 20 that can slide up and down and left and right, and a dredging pump 30 is installed above it. The biaxial crushers 10 and 20 can be accurately followed and moved with respect to the shape of the lake bottom. Therefore, the dredged material on the bottom SB can be dredged while being efficiently crushed.
Further, according to the dredging station 50 adopted in the dam dredging method of the present embodiment and the dredging system using the dredging station 50, the dredging Yakura 52 is a working machine equipped on the ship 1A provided on the water of the dam lake. Since it is connected to the ship 1A via a wire 5A wound around the 6A, the dredging station 50 can be reliably prevented from tipping over regardless of the shape of the lake bottom SB.

The dam dredging method according to the present invention, the dredging device, the dredging station, and the dredging system adopted therein are not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. Of course.
For example, in the above embodiment, the dredging station capable of walking on the bottom of the lake has been described as an example, but the present invention is not limited to this, and various devices can be adopted as long as the device can be dredged on the bottom SB of the dam lake.
However, the dredging exemplified in the above embodiment is configured as a configuration that can cope with the soft ground deposited on the bottom of the dam lake, slopes and undulations, and can be dredged while moving on the bottom of the lake in which large gravel and sunken trees are piled up in bulk. It is preferable to use a station.

Further, for example, in the above embodiment, as an example of performing dredging including a dredged object in a state where large gravel and sunken trees are piled up in bulk on the bottom SB of the dam lake, the dredging pump 30 and two twin shafts are used as an example. An example of providing crushers 10 and 20 is shown, but the present invention is not limited to this, and if large gravel or sunken trees are not a problem as dredged objects and fine-grained earth and sand are assumed, crushing is performed. It is also possible to adopt a dredging device that does not have a machine.
Specifically, unlike the dredging device 100B shown in the second embodiment in FIG. 13, the dredging device 100B does not have the two twin-screw crushers 10 and 20 but has only the dredging pump 30. It can be configured. The dredging device 100B shown in the second embodiment is basically the dredging device of the first embodiment except that the rake device 10R is mounted instead of the two twin-screw crushers 10 and 20. Since it has the same configuration as 100, detailed description thereof will be omitted.

As described above, according to the dredging system of the second embodiment, the dredging station 50B has the same configuration as that of the first embodiment except for the presence or absence of the crusher. Dredging the dredging station 50B with the wire 5A of the working machine 6A, and then pouring water into the floating body 71 of the dredging station 50, and then feeding out the dredging station 50B with the wire 5A of the working machine 6A as in the first embodiment. It can be hung and erected on the bottom SB of the dam lake.
Then, as in the first embodiment, by driving the dredging pump 30, the dredging slurry is discharged from the dredging position S of the bottom SB of the dam lake to the relocation position M which is the dumping ground of the bottom SB through the discharge pipe 7. Can only be transported through. Further, the dredging pump 30 can be accurately followed and moved with respect to the shape of the lake bottom SB.

In particular, in this example, since the rake device 10R is mounted, it is suitable for accurately following and moving the dredging pump 30 with respect to the shape of the lake bottom SB even if the lake bottom SB has severe undulations. Therefore, the dredged material on the bottom of the lake can be efficiently dredged by the dredging device 100B having only the dredging pump 30.
Further, since the ship 1A has a working machine 6A capable of raising and lowering the dredging station 50B via the wire 5A, the dredging station 50B can be reliably prevented from tipping over regardless of the shape of the lake bottom SB.

Further, in the first and second embodiments described above, an example in which a submersible sand pump is used as the dredging pump 30 has been described, but the dredging pump is not limited to this, and is not limited to the presence or absence of a crusher. Various pumps can be adopted for 30. For example, as shown in FIG. 14 as the dredging device 100C of the third embodiment, as the dredging pump 30C, a jet pump can be used instead of the submersible sand pump.
As shown in the figure, the dredging pump 30C has a high-pressure fluid supply pipe 35C provided with an injection nozzle 36C at the tip to feed high-pressure fluid, and a mixing chamber 34C in which the injection nozzle 36C of the high-pressure fluid supply pipe 35C communicates with each other. It has a drain pipe 37C formed in the middle portion, a suction hopper 40C is provided in the lower part of the drain pipe 37C, and a discharge pipe 7 is connected to the upper part of the drain pipe 37C.

Even with such a configuration, high-pressure fluid is injected into the mixing chamber 34C from the injection nozzle 36C of the high-pressure fluid supply pipe 35C, and the pressure difference generated in the mixing chamber 34C causes the suction hopper 40C to reach the bottom of the dam lake. The dredging fluid (dredging object) at the dredging position S of the SB can be sucked up to the drain pipe 37C, and the dredging fluid can be transferred to the relocation position M which is the dumping ground of the lake bottom SB via the discharge pipe 7 only through the lake water.

1A Ship 1B Support ship 2 Generator 3 Hydraulic pump (pump mechanism for dredging slurry pumping)
5A, 5B Wire 6A, 6B Work Machine 7 Discharge Piping 7a Flexible Hose 7b Floater 7c Weight 8 Ambiliqueable 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 drive 32 Submersible motor 33 Drive shaft 34 Casing 35 Impeller 36 Suction port 37 Drain pipe 38 Housing 39 Cap tire cable 40 Suction hopper 41 , 41B Bearing 42 Shaft Seal 44 Scraper 45 (Crusher) Frame 46 Control Valve 47 Motor 48 Drive 50 Dred Station 51 Platform 51X Upper Frame 51Y Lower Frame 51M Intermediate Frame 52 Dred Yakura 53X Moving Frame 53X Directional movement mechanism 54 Y movement frame 54Y Y direction movement mechanism 60 Control unit 61 Controller 66 Support leg 69 Jack mechanism 80 Inertivity sensor 90 Elevating device 91 Elevating device 91 Elevating rack 92 Drive unit 100 Dredging device D Dam Embankment G Intake facility SL dam Above the lake SB Dam Lake bottom S Dred position M Relocation position (disposal site)

Claims (5)

The dredging yakura installed on the bottom of the dam lake, the dredging device including the pump mechanism for dredging material pumping installed in the dredging yakura, and the discharge pipe connected to the pump mechanism of the dredging device. It is a method of dredging a dam using the dredging station that you have.
The dredging Yakura is a horizontal movement capable of moving the platform in at least one of the X and Y directions orthogonal to each other in a horizontal plane with a platform having an upper frame, a lower frame and an intermediate frame arranged between these upper and lower frames. A plurality of support legs provided on each of the upper and lower frames and capable of relative slide movement individually in the Z direction via a vertical movement mechanism, and each support leg is landed on the bottom of the dam lake. And, the horizontal movement mechanism is configured to enable relative slide movement of the intermediate frame and the upper frame in one direction via a horizontal movement mechanism in 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 dredging device comprises a crusher and the pump mechanism installed on top of the crusher.
The crusher is composed of two twin-screw crushers arranged in two upper and lower stages and each having a pair of drum cutters, and the upper twin-screw crusher is located at a position facing the suction side of the pump mechanism. The lower twin-screw crusher has its own pair of drum cutters on the side opposite to the suction side of the pump mechanism with respect to the pair of drum cutters of the upper twin-screw crusher. The pair of drum cutters of the lower twin-screw crusher provided has a scraping function for scraping the dredged object and a coarse crushing function for roughly crushing the dredged object, and the pair of the upper twin-screw crusher. The drum cutter of the above is a two-axis crusher in the lower stage, which has a fine crushing function to crush the dredged material after being roughly crushed. A dam dredging method characterized by transporting only through the inside. The dredging station is suspended at the dredging position on the bottom of the lake via a wire wound around a working machine installed on a ship on the lake, and the discharge pipe is laid along the bottom of the lake or its vicinity. The dam according to claim 1 , wherein the discharge port at the tip of the pipe is arranged in the dumping ground at the bottom of the lake, and the dredged material at the dredging position collected by the pump mechanism is discharged to the dumping ground via the discharge pipe as a dredging slurry. Dredging method. The discharge pipe includes a flexible hose, a plurality of floaters attached to the flexible hose at predetermined intervals so that the load at the time of pumping the dredged object is offset, and discharge of the tip of the flexible hose. The dam dredging method according to claim 1 or 2 , wherein a weight provided in the vicinity of the exit and a weight having the hose are used. The dam dredging method according to any one of claims 1 to 3 , wherein the dredging device is a submersible pump or a jet pump whose pump mechanism is a submersible pump or a jet pump. The dam dredging method according to any one of claims 1 to 4 , wherein the dredging device is installed so as to be vertically movable and slidable in the frame of the dredging yakura.

Images