JPH0426647B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) 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. As a result, sand, mud, shellfish, and coarse materials such as large stones and sunken wood are accumulated in the water 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 properly remove the sediment that has accumulated in the water intake tank.

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. 8 to 10. That is, in the method shown in FIG. 8, 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 expanded and contracted and moved laterally to open the water intake tank 4.
Sediment 5 deposited on the bottom of the water is sucked in and removed by a submersible sand removal pump 1. In addition, the method shown in FIG.
The earth and sand 5 are grabbed and lifted by opening and closing. Furthermore, in the method shown in FIG. 10, a garter crane 7 is installed above the water intake tank 4, the submersible sand removal pump 1 is suspended from the garter crane 7, and the submersible sand removal pump 1 is moved by the movement of the garter crane 7. The sediment 5 at the bottom of the water intake tank 4 is then sucked in and removed by the submersible sediment pump 1.

In addition, a technology was developed in which the screw-like fins, whose spiral direction is reversed on the left and right sides, gather the earth and sand in the center of the shaft, and the submersible sand pump sucks this up.
This method is disclosed in JP-A No. 64737, JP-A-50-91134, and JP-A-47-28741. With these techniques, the fins collect and suck in the earth and sand from the left and right over a wide range, so that the earth and sand can be efficiently removed.

(Problems to be Solved by the Invention) By the way, in the method shown in FIGS. 8 and 10 above, the sediment 5 in a narrow area of the bottom of the water where 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 sucking and removing earth and sand 5 is poor. Therefore, it is necessary to move the lowering and lowering positions of the submersible sand removal pumps 1 one after another, and this work is complicated. Furthermore, large objects such as sunken wood tend to block the pump or the pump suction port, and in such a case, it is necessary to stop the work, pull up the submersible sand removal pump 1, and remove the blockage, which further improves work efficiency. The problem is that it gets worse.

In addition, in the method shown in FIG.
In addition to the problems with the method shown in Figures and Figure 10,
There is a problem that the earth and sand 5 picked up by the bucket 6 tends to leak, and when the earth and sand 5 is picked up, it tends to be thrown up into the water, making it easy to pollute the water quality.

In the technique of collecting earth and sand using screw-like fins, large objects such as sunken trees can be collected between the ends of the fins and the bearing or between the ends of the fins where the distance is narrow. There was a problem that it was easy to get caught and get clogged.

An object of the present invention was to solve the above-mentioned problems in the conventional work of removing sediment accumulated on the water bottom, and to eliminate the problem of removing the sediment accumulated on the water bottom into the water, and to avoid pumping or suction of the pump. To provide an underwater sediment removal device capable of efficiently sucking and removing sediment with an underwater sand removal pump without blocking the mouth.

(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 deposited on the bottom of the water. Two or two sets of screw-like fins, the spiral direction of which is reversed on the left and right, are mounted on a horizontal rotary drive shaft that is perpendicular to the direction of rotation and supported only at both ends. The rotary drive shaft is covered with a trough having an opening at the bottom, and the tip is inserted into the lower opening inlet side of the trough in the direction orthogonal to the rotary drive shaft between the fins. A fixed vane is provided so that the trough is open, and a cylindrical body is opened in the upper part of the trough, facing the center of the shaft and communicating with the suction port of the submersible sand removal pump.

(Function) The rotary drive shaft covered with a trough with an open bottom is provided with screw-like fins whose spiral direction is reversed on the left and right sides, so that the rotary drive shaft is pulled over the deposit while being rotated. Sediment gathers under the center of the shaft from both sides over a wide area. and,
Since the cylindrical body facing the center of the shaft and communicating with the suction port of the submersible sand evacuation pump is opened in the trough, the sand and sand kicked up in the trough can be sucked in and removed by the submersible sand evacuation pump. Therefore, it is possible to efficiently suck in and remove earth and sand from a wide range, and furthermore, the earth and sand are not thrown up outside the trough and the water quality is not polluted. In addition, fixed blades whose tips are inserted perpendicularly to the rotational drive shaft between the center parts of the shafts of two or two sets of screw-like fins whose spiral directions are reversed on the left and right sides are placed on the inlet side of the lower opening of the trough. Because of this, even if large objects such as large stones or sunken wood are gathered in the center by the fins, these fixed blades will scrape them off at the entrance side of the trough, and the ends of two or two sets of fins on the center side will be scraped off. There will be no clogging due to large objects being caught between the pumps, and the pump or the suction port of the pump will not be blocked by large objects.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a partially cutaway rear view of an embodiment of the underwater sediment removal device of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG.
The figure is a diagram in which a tracked vehicle is equipped with the underwater sediment removal device of the present invention.

First, as shown in FIG. 3, a rake device 11 that can freely swing vertically 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 to collect large objects. At the rear of the vehicle, an underwater sediment removal device 12 of the present invention is provided so as to be able to swing vertically. This underwater sediment removal device 12 collects sediment 5 in a wide range on the left and right under the central part of the shaft, suctions it with a submersible sediment pump (not shown) mounted on the tracked vehicle 10, pressurizes it, and then sends it to the drainage hose 13. The structure is such that the earth and sand 5 is discharged to the outside of the water intake tank 14 through the water intake tank 14.

Below, regarding the underwater sediment removal device 12 of the present invention,
This will be explained in detail with reference to FIGS. 1 and 2. A horizontal rotary drive shaft 20 orthogonal to the forward direction F of the tracked vehicle 10 is rotationally driven 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. Rotation drive shaft 20
There are two sets of screw-like fins 22, each of which has three threads, with the spiral direction reversed on the left and right sides.
23 is provided at the center of the shaft so that the end portions are spaced apart from each other by an appropriate distance in the axial direction. Further, the rotary drive shaft 20 is supported only at both ends 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. It covers the fins 22, 23, etc. A fixed blade 25 is provided on the lower opening inlet side of the central portion of the shaft of the trough 28 so that its tip is inserted into the space between the fins 22 and 23 in a direction perpendicular to the rotary drive shaft 20. Furthermore, a cylindrical body 29 is opened in the trough 28 facing the center of the shaft, and this cylindrical body 29 is connected to the tracked vehicle 10 through a flexible hose.
It will be connected to the suction port of the submersible sand removal pump installed in the submersible sand pump. 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 center of the shaft from the left and right by the fins 22 and 23, and are blown up into the water inside the trough 28. The earth and sand 5 thrown up into the water 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 manner, as the tracked vehicle 10 moves forward F, a large amount of wide earth and sand 5 provided with the fins 22 and 23 is continuously sucked in by the submersible sand removal pump, resulting in high work efficiency. Moreover, the thrown up earth and sand 5 is covered by the trough 28, so it does not fly up outside the trough 28, and does not pollute the water quality. Furthermore, even if coarse objects such as large stones or sunken wood are gathered at the center of the shaft by the fins 22 and 23, they will be scraped off by the fixed blades 25, so that they will not be caught between the fins 22 and 23 and jammed between the two. Moreover, the cylindrical body 29, the pump, or the suction port of the pump will not be blocked. Note that by forming the screw-like fins 22 and 23 with three threads, the soil 5 can be continuously gathered under the center of the shaft to stabilize the suction performance of the submersible sediment pump. Of course, it may also be formed by.

4 and 5 show other embodiments of the underwater sediment removal device of the present invention. FIG. 4 is a partially cutaway rear view of another embodiment of the underwater sediment removal device of the present invention, and FIG. 5 is a sectional view taken along the line B-B in FIG. 4. In FIGS. 4 and 5, the same members as those in FIGS. 1 and 2 are given the same reference numerals, and redundant explanations will be omitted.

4 and 5, the difference from the device shown in FIGS. 1 and 2 is that screw-shaped fins 2 provided on the left and right sides of the rotary drive shaft 20
2 and 23 are provided so that their central end portions face each other, and these end portions are bent toward each other to form bucket bags 22a and 23a, respectively.
Then, there is a gap of 2 between both buckets 22a and 23a.
4 is maintained, and the tip of a fixed blade 25 provided on the lower opening inlet side of the trough 28 in a direction orthogonal to the rotary drive shaft 20 is inserted into this interval 24.

In this embodiment, with respect to the apparatus shown in FIGS. 1 and 2, the earth and sand 5 collected under the central part of the shaft is transferred to the cylindrical body by buckets 22a and 23a.
The earth and sand 5 can be more effectively blown up into the trough 28 toward the opening of 9, and the earth and sand 5 can be sucked in efficiently. Moreover, the bulky items are 22
Even if the large objects are scooped up by the buckets 22a and 23a, they are crushed and scraped off by the fixed blade 25 inserted in the space 24 between the buckets 22a and 23a, so that the large objects do not block the pump suction port. There is no.

FIG. 6 and FIG. 7 show still another embodiment of the underwater sediment removal device of the present invention. FIG. 6 is a partially cutaway rear view of still another embodiment of the underwater sediment removal device of the present invention, and FIG. 7 is a sectional view taken along the line CC in FIG. 6. In Figures 6 and 7,
Components that are the same as those in FIGS. 1 and 2 are designated by the same reference numerals and redundant explanations will be omitted.

6 and 7, the difference from the apparatus shown in FIGS. 1 and 2 is that a plurality of radial blades 26, 26, . The central ends of the fins 22, 23 and the radial blades 26, 2
The fixed blades 25, 25 are provided on the lower opening inlet side of the trough 28 so that their tips are inserted between the trough 28 and the trough 28, respectively.

In this embodiment, the radial blades 26, 2
Due to the rotation of 6..., the earth and sand 5 collected by the fins 22 and 23 are thrown up in the trough 28 and sent to the cylindrical body 29.
In addition to improving the suction by the radial blades 26, 26, when coarse objects such as large stones and sunken trees are scraped off by the fixed blades 25, 25, the large objects are pushed out and removed between the blades of the radial blades 26, 26... I can do it.

In the above embodiment, the underwater sediment removal device 12 of the present invention was towed over the deposits by the tracked vehicle 10, but the invention is not limited to this, and it may be towed by an underwater bulldozer or the like. Furthermore, the submersible sand removal pump may be placed outside the water intake tank 14. The underwater sediment removal device of the present invention not only removes the sediment 5 deposited on the bottom of the water intake tank, but also
It is useful for removing sediment 5 deposited in sedimentation basins of water supply facilities, sedimentation basins of sewage facilities, and on the seashore and river bottoms. Furthermore, Finn 22,2
The central end portions 3 are not limited to facing each other as in the above embodiment, but may be arranged in a staggered manner.

(Effects of the Invention) As explained above, according to the underwater sediment removal device according to the present invention, a screw-like fin whose spiral direction is reversed on the left and right sides is attached to the rotary drive shaft covered with a trough with an open bottom. The ends of the fins are placed at an appropriate distance in the center of the shaft, and the tips of the fixed blades provided on the trough are inserted into this distance, so that the rotary drive shaft is pulled over the sediment while being rotated. As a result, a wide range of earth and sand from the left and right is gathered under the center of the shaft and thrown up in the trough. Since the cylindrical body facing the center of the shaft and communicating with the suction port of the submersible sand removal pump is opened in the trough, the earth and sand kicked up in the trough can be sucked and removed by the submersible sand removal pump. Therefore, it is possible to efficiently suck in and remove the earth and sand from a wide range, and the earth and sand are not thrown up outside the trough and the water quality is not polluted. In addition, fixed blades inserted between the center ends of screw-like fins whose spiral direction is reversed on the left and right sides,
The fins scrape off large stones, sunken wood, and other large objects that have been gathered together, and are not caught in the fins and become clogged, which is an advantage in that the pump and the pump suction port are not blocked. It has a great effect.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway rear view of an embodiment of the underwater sediment removal device of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. FIG. 4 is a partially cutaway rear view of another embodiment of the underwater sediment removal device of the present invention, and FIG.
6 is a partially cutaway rear view of still another embodiment of the underwater sediment removal device of the present invention, and FIG. 7 is a sectional view taken along the line C--B in FIG. This is a sectional view taken in the direction of arrow C. Fig. 8 is a diagram explaining the conventional sand removal work in which a submersible sand removal pump is suspended into a water intake tank by a crane, and Fig. 9 is a diagram illustrating a conventional sand removal work in which a submersible sand removal pump is suspended into a water intake tank by a crane. FIG. 10 is a diagram illustrating a conventional sand removal operation in which a submersible sand removal pump is suspended from a garter crane provided above a water intake tank. 5: earth and sand, 12: underwater earth and sand removal device, 20: rotational drive shaft, 22, 23: screw-shaped fins,
22a, 23b: Bucket, 24: Interval, 25:
Fixed vane, 26: Radial vane, 28: Trough, 2
9: Cylindrical body.

Claims (1)

[Scope of Claims] 1. An underwater sediment removal device for removing sediment accumulated on the water bottom, which comprises a horizontal rotational drive shaft that is orthogonal to the direction in which the sediment is towed and is supported only at both ends. , two or two sets of screw-like fins whose spiral directions are reversed on the left and right sides are provided at the center of the shaft so that the ends on the center side are separated by an appropriate distance in the axial direction,
covering the rotary drive shaft with a trough with an open bottom;
A fixed blade is provided on the lower opening inlet side of the trough so that its tip is inserted into the gap between the fins in a direction perpendicular to the rotational drive shaft, and a fixed blade is provided at the upper part of the trough facing the center of the shaft to install a submersible sand removal pump. An underwater sediment removal device characterized by having an open cylindrical body communicating with a suction port. 2. The ends of the screw-like fins on the center side are provided so as to face each other, and the ends are bent toward each other to form buckets separated by an appropriate distance in the axial direction at the center of the shaft, and this distance is 2. The underwater sediment removal device according to claim 1, wherein the fixed blade is provided so that a tip thereof is inserted into the fixed blade. 3. A radial blade is provided at the center of the rotary drive shaft so as to be orthogonal to the rotary drive shaft, and the fixed blade is inserted such that the tip thereof is inserted between the central end of the fin and the radial blade. An underwater sediment removal device according to claim 1 or 2, characterized in that the device is provided with: