JPH0360977B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an underwater sediment removal device that efficiently sucks and removes sediment deposited on the bottom of the water using a submersible sediment pump without blowing up the sediment into the water. It is.

BACKGROUND OF THE INVENTION Nuclear and thermal power plants are typically built along coastlines and rely on seawater for the cooling water needed by their equipment. This cooling water is made from supernatant seawater that has been settled in a water tank that collects sand and mud. For this reason, coarse materials such as sand, mud, shellfish, and inflowing sunken wood accumulate in the intake tank. In particular, large amounts of earth and sand are likely to accumulate after the sea becomes rough, such as when a typhoon passes.
Therefore, it is necessary to remove the sediment accumulated in the water intake tank as appropriate.

The work of removing the earth and sand accumulated in the water intake tank has conventionally been carried out by the method shown in FIGS. 4 to 6. That is, in the method shown in FIG. 4, the submersible sand removal pump 1 is suspended from the hook at the end of the crane arm 3 of the crane truck 2, and the crane arm 3 is extended and contracted and moved laterally to open the water intake tank 4.
Sediment 5 deposited on the bottom of the tank is sucked and discharged by a submersible sand discharge pump 1. In the method shown in FIG. 5, a bucket 6 is suspended from a hook at the tip of the crane arm 3, and the bucket 6 is opened at the bottom of the water intake tank 4 to pick up the earth and sand 5. Furthermore, in the method shown in FIG. 6, a girder crane 7 is installed above the water intake tank 4, the submersible sand removal pump 1 is suspended from this girder crane 7, and the submersible sand removal pump 1 is suspended by moving the girder crane 7. 1 is moved to suck and discharge earth and sand 5 at the bottom of a water intake tank 4 using a submersible sand removal pump 1.

(Problem to be Solved by the Invention) By the way, in the method shown in FIGS. 4 and 6 above, the sediment 5 in a narrow range at the bottom of the tank from which the submersible sand removal pump 1 is suspended is sucked and removed. However, other surrounding earth and sand 5 is not sucked in, but only seawater is sucked in, and the work efficiency of suctioning and discharging earth and sand 5 is poor. Therefore, it is necessary to move the positions where the submersible sand removal pump 1 is suspended one after another, and this work is troublesome.

In addition, in the method shown in FIG.
In addition to the disadvantages of the methods shown in Figures 6 and 6, the soil 5 picked up by the bucket 6 tends to leak, the soil 5 is easily thrown into the water when it is picked up, and the water intake tank 6
The problem is that it easily pollutes the water quality.

The present invention was made in order to solve the above-mentioned problems with the conventional work of removing sediment accumulated on the water bottom.The present invention was made in order to solve the above-mentioned problems with the conventional work of removing sediment accumulated on the water bottom. The purpose is to provide an underwater sediment removal device that can

(Means for Solving the Problems) In order to achieve the above object, the underwater sediment removal device of the present invention is an underwater sediment removal device for removing sediment accumulated on the bottom of the water, and is an underwater sediment removal device that moves over the sediment. A horizontal rotary drive shaft perpendicular to the direction is rotated so that the rotation direction on the lower side is the same as the moving direction, and the helical direction is reversed on the left and right sides of this rotary drive shaft, and the rotation moves the earth and sand to the center. Screw-shaped fins that are gathered to the side are spaced apart at the center of the shaft or wider than this distance, and the ends on the center side of the shaft are opposed, and the opposing ends of these fins are connected by a plate material. a bucket continuously integrated with the fins, a trough with an open bottom covering the rotary drive shaft on which the fins are provided, and a central part of the axis of the trough communicating with the suction port of the submersible sand removal pump. It is constructed by opening a cylindrical body.

(Function) The ends of the left and right screw-shaped fins on the shaft center side are arranged opposite to each other, and the opposing ends of these fins are connected by a plate material to form a bucket that is continuous and integral with the fins. The ends of the left and right fins are connected and mutually function as supporting members, reinforcing the strength of the fins, and the bucket bag is easy to manufacture and has excellent strength. In addition, since the rotary drive shaft is rotated so that the rotation direction of the lower side is the same as the moving direction, the bucket scoops up the collected dirt in the forward direction of movement, and the bucket scoops up the collected dirt one after another, leaving behind some dirt. There is no. Moreover, since the bucket is formed continuously and integrally with the fins, the earth and sand collected on the shaft center side by the fins can be blown into the trough without leaking.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. Figure 1 is a diagram of a tracked vehicle equipped with the underwater sediment removal device of the present invention;
The figure is a partially cutaway rear view of one embodiment of the underwater sediment removal device of the present invention, and FIG. 3 is a
It is an arrow sectional view.

In FIGS. 1 to 3, a rake device 11 that can swing up and down to collect large objects is installed at the front of a tracked vehicle 10 that can run on the sediment 5 deposited on the bottom of the water intake tank 14. An underwater sediment removal device 12 of the present invention is provided at the rear so as to be vertically swingable. This underwater sediment removal device 12 collects sediment 5 in a wide range on the left and right under the center of the shaft, suctions it with a submersible sediment pump (not shown) mounted on the tracked vehicle 10, pressurizes it, and sends it through a drainage hose 13. The earth and sand 5 are discharged to the outside of the water intake tank 14.

Below, the underwater sediment removal device 12 of the present invention will be explained in detail. As the tracked vehicle 10 moves forward in the direction F, the horizontal rotary drive shaft 20 is moved over the deposit and perpendicular to this direction of movement.
It is rotated clockwise by a hydraulic motor 21. This hydraulic motor 21 is appropriately driven and controlled by a hydraulic control unit (not shown) mounted on the tracked vehicle 10. The rotary drive shaft 20 includes
Three screw-like fins 22 and 23 whose spiral directions are reversed on the left and right sides and which collect dirt and sand toward the center side by rotation are attached to the center part 24 of the shaft.
3 interval d2 or a distance d wider than this interval d2
1, and the ends 22a and 23a on the shaft center portion 24 side are provided so as to face each other. These end portions 22a, 23a are connected by a plate material to form buckets 26, 26, . . . which are continuously integrated with the fins 22, 23. Further, the rotary drive shaft 20 is supported by bearing members 27, 27, and a trough 28 having a U-shaped cross section with an open bottom is fixed to the bearing members 27, 27, and the rotary drive shaft 20 and the fins 22, 23 It covers etc. A cylindrical body 29 is opened in this trough 28 facing the shaft center part 24,
This cylindrical body 29 is communicated with a suction port of a submersible sand removal pump mounted on the tracked vehicle 10 via a flexible hose. Note that an arm protruding from the tracked vehicle 10 is fixed to the trough 28, and the underwater sediment removal device 12 is swung up and down when the arm is swung up and down.

In such a configuration, the forward movement F of the tracked vehicle 10
At the same time, the rotary drive shaft 20 is rotated clockwise in FIG. Then, the earth and sand 5 under the fins 22 and 23 are gathered under the shaft center part 24 from the left and right by the fins 22 and 23, and further moved to the bucket 2.
6, 26, etc., and are scooped up in the forward direction F and thrown up into the water at the shaft center portion 24 inside the trough 28. Here, the earth and sand 5 collected on the shaft center portion 23 side by the fins 22 and 23 are removed from the bucket 2.
6, 26, etc., it is scooped up in the forward direction. Also, the soil that was not scooped up by the previous bucket is scooped up one after another by the succeeding buckets 26, 26, etc., so that no dirt is left behind. Furthermore, the buckets 26, 26, . . . formed continuously with the fins 22, 23 ensure that even stones or sand with a large specific gravity are thrown up into the water in the trough 28 without leaking. The earth and sand 5 kicked up into the water inside this trough 28 is sucked in by a submersible sand discharge pump through a cylinder 29 and discharged to the outside of the water intake tank 14 through a drainage hose 13. in this way,
As the tracked vehicle 10 moves forward F, the fins 22, 2
A large amount of earth and sand 5 with a wide width provided with 3 is continuously sucked in by the submersible sand removal pump, so that work efficiency is high and no earth and sand is left behind. Moreover, the earth and sand 5 thrown up by the buckets 26, 26, . . . is covered by the trough 28, so that it does not fly up outside the trough 28, and does not pollute the water quality of the water intake tank 14. Furthermore, the fins 2 at the center portion 24 of the shaft
The distance d1 between fins 22 and 23 is
Since the distance d2 is set to d2 or larger than the distance d2, large stones, sunken wood, etc. brought to the center by the fins 22 and 23 will not be held between the fins 22 and 23 and become jammed between the two. Moreover,
Since the ends 22a and 23a of the fins 22 and 23 are connected by a plate material, they mutually function as supporting members,
The strength of the fins 22 and 23 is reinforced. Moreover, the buckets 26, 26... can be formed by simply connecting the ends 22a, 23a of the fins 22, 23 with a plate material, and are easy to manufacture.
It also has excellent strength due to mutual support with 3. Furthermore, screw-like fins 22,
By forming 23 in three strips, the soil 5 can be continuously collected in the center and the suction performance of the submersible sand pump can be stabilized, but it is of course possible to form it in one strip. .

In the above embodiment, the underwater sediment removal device 12 of the present invention is towed over the deposits by the tracked vehicle 10, but the device is not limited to this, and may be moved by an underwater bulldozer or the like. Here, the rotary drive shaft 20 is rotatably driven so that the rotation direction of the lower side is the same as the moving direction, and the buckets 26, 2
6... should be used to scoop up the earth and sand in the forward direction. Furthermore, the submersible sand removal pump may be placed outside the water intake tank 14. Furthermore, the underwater sediment removal device of the present invention not only removes sediment 5 accumulated on the bottom of the water intake tank 14, but also removes sediment accumulated on the sedimentation basin of water supply equipment, sedimentation basin of sewage equipment, and on the bottom of the coast and river. It is useful to use it to eliminate 5.

(Effects of the Invention) As explained above, the underwater sediment removal device according to the present invention provides the following excellent effects.

Since the fins and the bucket are integrally formed, the strength of the fins is reinforced, and the strength of the bucket is also superior to that of an independent bucket protruding from the rotating drive shaft, making it less likely to be damaged. Hateful.
The earth and sand deposited in the water intake tank includes not only mud and sand but also stones, shells, and even sunken wood, and the fact that fins and buckets are strong and difficult to damage means that they are not easily damaged. This is extremely useful in terms of equipment maintenance and management during sand removal operations.

In addition, the dirt gathered in the center side is scooped up one after another in the forward direction by the bucket, so
No dirt is left behind, and the work accuracy is excellent.

Moreover, since the bucket and the fin are formed as a continuous integral part, the dirt collected in the center of the shaft by the fin will not leak through the gap between the fin and the bucket, and even stones with large specific gravity can be safely removed. The sand is lifted into the trough by a bucket and can be efficiently sucked in by a submersible sand pump.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a tracked vehicle equipped with the underwater sediment removal device of the present invention, FIG. 2 is a partially cutaway rear view of one embodiment of the underwater sediment removal device of the present invention, and FIG. The figure is a cross-sectional view taken along the line A-A in FIG. Figure 6 is a diagram illustrating the conventional sand removal work in which a bucket is suspended into a water intake tank by a crane. It is a diagram explaining the work. 5: earth and sand, 12: underwater earth and sand removal device, 20: rotational drive shaft, 22, 23: screw-shaped fins,
22a, 23a: end portion, 24: shaft center portion, 26:
bucket, 28: trough, 29: cylinder, F: forward direction.

Claims (1)

[Claims] 1. An underwater sediment removal device for removing sediment accumulated on the water bottom, in which the horizontal rotation drive shaft is perpendicular to the direction of movement over the sediment, so that the rotation direction of the lower side is the same as the movement direction. drive rotation,
This rotary drive shaft has screw-shaped fins whose helical direction is reversed on the left and right sides, and which collects dirt and sand toward the center side by the rotation, and the fins are spaced apart at the center of the shaft or wider than this distance, and the screw-like fins are separated at the center of the shaft, and The opposing ends of these fins are connected by a plate material to form a bucket continuously integrated with the fins, and a trough with an open lower part is used to drive the rotation of the fins. 1. An underwater sediment removal device, characterized in that the shaft is covered and a cylindrical body is opened in the center of the shaft of the trough to communicate with a suction port of an underwater sediment removal pump.