JP2019039204A - Dredging device - Google Patents

Abstract

To provide a dredging device which does not require expert operation and can suppress turbidity and clogging in piping and the like.SOLUTION: A dredging device 1 comprises: a sand lifting pump 2 including a suction port 22A opening downward and disposed underwater; and a screen 3 disposed below the suction port 22A, and sucks and dredges sediment S and the like deposited on a lake bed 913 from the suction port 22A. The screen 3 includes: a bottom plate 32 facing the suction port 22A with a space in a vertical direction; and an inflow portion 33A which opens to a lateral side between the suction port 22A and the bottom plate 32 and through which an object smaller than a scale spacing passes. The suction port 22A sucks the sediment S and the like passing through the inflow portion 33A.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dredge device for dredging soil and the like deposited on the bottom of a dam lake, river, ocean, lake, or pool.

  In dam lakes, sediment dredged sediments are required to maintain the dam's water storage capacity. Further, in the dam type hydroelectric power generation facility, sand in the vicinity of the water intake formed in the dam becomes a particular problem in order to prevent sand from being mixed into the turbine of the power plant arranged on the downstream side of the dam. Furthermore, in rivers, harbors, lakes, etc., it is necessary to drown mud containing anaerobic microorganisms, so-called sludge, etc., deposited on the riverbed, seabed, and marsh bottom. Furthermore, in outdoor pools and the like, large cleaning is performed to remove earth and sand, mud, and dust accumulated on the bottom before the summer use season. Hereinafter, dam lakes, rivers, oceans, lakes, or pools may be collectively referred to as dam lakes, and the bottom of dam lakes may be referred to as water bottoms. In addition, earth and sand or mud deposited on the bottom of a dam lake or the like may be referred to as earth and sand.

  As dredging devices used for dam lakes, etc., dredging dirt and the like by dredging devices using ejector jet pumps that eject high pressure water from nozzles (see, for example, Patent Document 1), siphon action utilizing the difference in water level, A dredge apparatus (for example, Patent Document 2) that conveys by a hose or the like has been proposed. However, in the dredging device described in Patent Document 1, it is difficult to increase the diameter of the pipe that conveys the earth and sand sucked from the suction port in order to ensure the flow rate of the high-pressure water ejected from the nozzle, and the pipe is likely to be clogged. In addition, in the dredge device described in Patent Document 2, in order to sufficiently exert the siphon action, the diameter of the hose or the like must be reduced, and the clogging of the hose or the like may also occur in this dredge device. There is. For this reason, generally, the dredging apparatus provided with the grab bucket is used (refer patent document 3 grade | etc.,).

  The dredging device described in Patent Document 3 scoops up dredged soil and the like using a grab bucket suspended from a boom of a crane installed on a work boat or the like.

JP 2012-193502 A Japanese Patent Laying-Open No. 2005-036443 JP 2006-0775056 A

  However, the dredge device described in Patent Document 3 does not cause a problem such as clogging of piping or the like, but requires specialized operation in handling the grab bucket. Furthermore, when grabbing with a grab bucket, the sediment at the bottom of the water soars and a large amount of so-called turbidity occurs. In particular, when sludge is dredged in rivers, harbors, etc., there is a possibility that environmental problems such as diffusion of harmful substances to surrounding water areas may occur.

  In view of the above circumstances, an object of the present invention is to provide a dredge apparatus that does not require specialized operations and can suppress the occurrence of turbidity and clogging of piping and the like.

The dredging device of the present invention that solves the above object comprises a suction member having a suction port that opens downward and is disposed in water, and a screen disposed below the suction port, and accumulates on the bottom of the water. In a scissor device that sucks and sucks an object from the suction port,
The screen
A bottom plate facing the suction port at an interval in the vertical direction;
It has an inflow part through which an object smaller than the mesh width opens laterally between the suction port and the bottom plate,
The suction port sucks an object that has passed through the inflow portion.

  Here, the suction member may be a submersible pump such as a sand pump, or an ejector jet pump that injects high-pressure water from a nozzle. Further, the suction member may suck the object from the suction port by a siphon action utilizing a water level difference.

  Furthermore, the bottom of the water may be the bottom of a dam lake, river, ocean, lake, or the like, or may be the bottom of an outdoor pool for swimming or a pool for cooling water of nuclear power generation facilities.

  Further, the dredging device may be one in which the suction port is fixedly installed at a predetermined position of the bottom of the water, or using a work boat, a crane, a heavy machine, etc. The suction port may be moved together with the screen.

  According to the dredge apparatus of the present invention, the screen disposed below the suction port has the bottom plate facing the suction port at a distance in the vertical direction, and thus, for example, deposited on the bottom of the water. It can arrange | position so that this baseplate may be mounted on earth and sand. For this reason, not only a special operation such as handling of the grab bucket becomes unnecessary, but also the operation of arranging becomes very simple. In addition, since the suction port sucks an object that has opened to the side between the suction port and the bottom plate and has passed through the inflow portion through which an object smaller than the mesh width passes, it follows the suction port. Clogging of piping and the like can be effectively suppressed. Further, a horizontal flow is generated from the inflow portion opened to the side and toward the suction port, and earth and sand around the screen flows into the inflow portion and is sucked from the suction port. Thereby, the earth and sand around the screen is removed, and for example, even if the dredging device is moved in the horizontal direction, the earth and sand are not likely to rise, and the occurrence of turbidity can be suppressed, and the movement on the bottom of the water is also facilitated. .

Moreover, in the scissors apparatus of the present invention, the screen has a plurality of screen bars extending radially around a lower region of the suction port,
The inflow portion may be formed between the plurality of screen bars, and the eye width may increase from the inside toward the outside.

  Furthermore, in the scissors apparatus of the present invention, the plurality of screen bars may slide in the extending direction to change the size of the eye width. In other words, the plurality of screen bars may be slid in a radial direction around a lower region of the suction port.

  If this aspect is adopted, the size of the object passing through the screen is adjusted according to the place where the dredger device is used, the performance of the suction member, the accumulated sediment, the size of the piping of the suction member, etc. can do.

Moreover, in the dredge apparatus of the present invention, the suction member is a sand pump.
The sand pump is
A casing having the suction port;
An impeller that is housed in the casing and rotates about a vertical axis;
The object sucked into the casing from the suction port has a transport pipe that is transported toward the outside,
The impeller may be disposed at a position deviating from a center line of a path connecting the transport pipe and the suction port.

  Since the sand pump has the impeller that rotates about a vertical axis, the impeller rotates to generate a vortex centering on the vertical axis toward the suction port, and the water bottom It becomes easy for the earth and sand deposited on the inside to flow in from the inflow portion opened to the side. Further, if the impeller is disposed at a position off the center line of the route, it is difficult for an object sucked from the suction port to contact the impeller when passing through the route.

  Furthermore, the dredge apparatus of this invention may be provided with the disturbance nozzle which discharges the fluid around the said screen.

  If a fluid such as water or air is discharged from the disturbance nozzle around the screen, earth and sand accumulated on the bottom of the water is disturbed and easily flows from the inflow portion opened to the side.

Further, in the dredging device of the present invention, comprising a transfer member for transferring the object deposited on the water bottom toward the screen,
The transfer member is
A space forming member that extends toward the screen, forms a space in which an upper end portion is closed, and is provided with a suction port below the upper end portion;
A discharge port for discharging fluid into the space from the opposite side of the screen toward the screen;
The suction port functions as an opening that sucks an object deposited on the water bottom into the space by discharging fluid from the discharge port;
The space forming member may function as a path in which an object sucked into the space moves toward the screen when fluid is discharged from the discharge port.

  Here, the transfer member may move so as to rotate about the screen.

  The dredge apparatus of the present invention may be provided with a means for collecting earth and sand accumulated on the bottom of the water around the screen, and the earth and sand collected around the screen may be introduced from the inflow portion and sucked from the suction port.

  If the aspect which has the said transfer member is employ | adopted, earth and sand etc. are suck | inhaled in the said space from the said suction port by the fluid being discharged from the said discharge port, and flow toward the said screen through the said space formation member. . For this reason, the earth and sand deposited on the bottom of the water can be collected around the screen while suppressing soaring.

  According to the dredge apparatus of the present invention, it is possible to provide a dredge apparatus that does not require specialized operations and can suppress turbidity and clogging of piping.

It is a figure which shows typically a mode that the dredging apparatus of this invention has been arrange | positioned in the dam lake. It is a longitudinal cross-sectional view of the dredge apparatus shown in FIG. 1, and has shown typically the internal structure of the sand pump. (A) is a side view of the screen shown in FIG.1 and FIG.2. (B) is a top view which shows the internal structure by removing the top plate of the screen shown to (A). It is a figure which shows typically a mode that dredging earth and sand etc. with the dredging apparatus shown in FIG. (A) is a figure corresponding to FIG. 3 (A) in the modification of the screen shown in FIGS. (B) is the sectional view on the AA line of (A), (C) is the sectional view on the BB line of (B). FIG. 6 is a diagram showing a state where the mesh width of the inflow portion is increased on the screen of the modification shown in FIG. 5. It is a figure which shows the 2nd modification of the dredge apparatus shown in FIG. It is CC sectional view taken on the line of FIG. It is a top view which shows a mode that the transfer member shown in FIG. 7 is moved. It is a figure which shows typically the mode of 2nd Embodiment which has arrange | positioned the dredging apparatus of this invention in the dam lake provided with the waterway type hydroelectric power generation equipment. It is a figure which shows typically the mode of 3rd Embodiment which has arrange | positioned the dredging apparatus of this invention in the river. It is a figure which shows the modification provided with the moving mechanism of the saddle device shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment, an example in which the vicinity of a dam intake in a dam lake provided with a dam type hydroelectric power generation facility is taken up will be described.

  FIG. 1 is a diagram schematically showing a state where the dredging apparatus of the present invention is arranged in a dam lake. In FIG. 1, the right side of the figure is the upstream side of the dam lake, and the left side of the figure is the downstream side of the dam lake.

  As shown in FIG. 1, in the dam lake 91, water is blocked by a dam 911, and the dam 911 is provided with a water intake 911A. As described above, the dam lake 91 in FIG. 1 includes a dam-type hydroelectric power generation facility, and the water taken from the water intake port 911A flows through a hydraulic line (not shown) to the turbine of the power plant. A dust remover 912 is provided on the upstream side of the water intake 911A to remove dust (driftwood, dust, etc.) contained in the water. On the lake bottom 913, earth and sand S that has passed through the dust remover 912 is taken in the water intake 911A. It is also deposited in the vicinity. The dredging device 1 according to the present embodiment dreds sediments S accumulated in the vicinity of the water intake port 911A and mainly prevents the sediments S from flowing into a turbine (not shown).

  As shown in FIG. 1, the dredger device 1 is disposed on the earth and sand S accumulated near the water intake 911 </ b> A in a state suspended from the work boat 71. In this embodiment, the sand pump 2 is employed as the suction member. The work boat 71 has an elevator 711, and the dredger device 1 is suspended by a wire 712 extending from the elevator 711 so as to be movable up and down.

  The sand pump 2 has a transport pipe 23 that transports the sand S and the like S sucked together with water, and this transport pipe 23 is connected to a sand settling machine 8 installed around the dam lake 91.

  FIG. 2 is a longitudinal sectional view of the dredge apparatus 1 shown in FIG. 1 and schematically shows the internal structure of the sand pump.

  As shown in FIG. 2, the dredger device 1 includes a sand pump 2 and a screen 3. The sand pump 2 includes a motor housing 21 in which the motor M is housed, and a pump casing 22 disposed below the motor housing 21. A predetermined mechanical seal is provided between the motor housing 21 and the pump casing 22 in consideration of the water depth of the dam lake 91. The pump casing 22 has a pump discharge port 221 oriented in the horizontal direction. Although omitted in FIG. 2, an elbow pipe 231 and a piping hose 232 shown in FIG. 4 are connected to the pump discharge port 221, and the pump discharge port 221, the elbow pipe 231 and the piping hose 232 are used for conveyance. A tube 23 is formed.

  The motor M is driven and controlled by a control unit (not shown). The pump casing 22 accommodates an impeller 222 that is attached to the drive shaft of the motor M and rotates when the motor M is driven. A suction port 22A that opens downward is formed at a position below the impeller 222. Has been. The sand pump 2 of the present embodiment is a vortex pump in which the impeller 222 rotates about a vertical axis. The sand pump 2 of the present embodiment employs a general pump in which the impeller 222 rotates clockwise in plan view. When the impeller 222 rotates, a spiral flow is drawn from the suction port 22A into the pump casing 22 as shown by a spiral arrow in the figure, and is discharged from the pump discharge port 221 as shown by a straight arrow in the figure. Is done. The impeller 222 is arranged at a position deviating from the center line R of the path connecting the pump discharge port 221 and the suction port 22A, and a gap C between the pump casing 22 and the impeller 222 is sufficiently secured. Accordingly, the earth and sand S sucked from the suction port 22A is prevented from coming into contact with the impeller 222. The screen 3 is disposed below the suction port 22A.

  FIG. 3A is a side view of the screen 3 shown in FIGS. 1 and 2.

  As shown in FIGS. 2 and 3A, the screen 3 includes a top plate 31, a bottom plate 32, and a plurality of screen bars 33 arranged between the top plate 31 and the bottom plate 32. . The screen 3 is fixed to a mounting portion 223 provided at the lower end portion of the pump casing 22 by a bolt 34 (see FIG. 4). Each of the plurality of screen bars 33 is integrally formed with the top plate 31 and the bottom plate 32 by, for example, welding.

  FIG. 3B is a plan view showing the internal structure by removing the top plate 31 of the screen 3 shown in FIG.

  As shown in FIG. 3B, the top plate 31 is a donut-shaped plate material in which an opening 31A having a circular shape in plan view is formed in the central portion. As shown in FIG. 2, the opening 31 </ b> A is formed to have substantially the same size as the suction port 22 </ b> A of the sand pump 2.

  As shown in FIG. 3 (B), the bottom plate 32 is a circular plate member having a diameter smaller than that of the top plate 31 in plan view, and as shown in FIGS. 2 and 3 (A), the suction port of the sand pump 2 22A and the opening 31A of the top plate 31 are arranged to face each other with a space in the vertical direction. As shown in FIG. 3 (B), the plurality of screen bars 33 extend radially from the bottom plate 32 except for a region facing the opening 31A of the top plate 31. That is, the plurality of screen bars 33 extend radially from the lower region of the suction port 22A. In the present embodiment, inflow portions 33 </ b> A are formed between the plurality of screen bars 33. The inflow portion 33A opens laterally between the suction port 22A and the bottom plate 32, and the width of the inflow portion 33A (the interval between the screen bars 33) becomes the mesh width. As shown in FIG. 3B by enlarging it with an ellipse, the eye width of the inflow portion 33A is set so as to increase from the inner eye width D1 toward the outer eye width D2.

  In FIG. 3B, the rotation direction (direction clockwise in plan view) of the impeller 222 shown in FIG. 2 is indicated by an arc-shaped arrow. When the motor M shown in FIG. 2 is driven to rotate the impeller 222, a spiral flow from the suction port 22A into the pump casing 22 is generated as indicated by a spiral arrow in FIG. Along with this, as shown by the dotted arrows in FIGS. 2 and 3B, a flow that enters the inflow portion 33A from the periphery of the screen 3 occurs.

  Further, as shown in FIGS. 3A and 3B, in this embodiment, a pair of disturbance nozzles 35 are provided on the top plate 31. In FIG. 3B, the position of the disturbance nozzle 35 with respect to the bottom plate 32 and the screen bar 33 is indicated by a one-dot chain line. The disturbance nozzle 35 is connected to a supply pipe (not shown) and injects water supplied from the supply pipe. In the pair of disturbance nozzles 35 of the present embodiment, the water to be sprayed indicated by a one-dot chain line is slightly downward, and in a forward direction to a virtual circle that rotates in the rotation direction of the impeller 222 (clockwise in the present embodiment). It is arranged to approach.

  Next, an example of a dredging operation using the dredging device 1 will be described. First, the work boat 71 shown in FIG. 1 is moved to a predetermined position near the water inlet 911A, and the elevator 711 is operated to place the dredger device 1 on the earth and sand S as shown in FIG.

  FIG. 4 is a diagram schematically showing a state where the earth and sand S is dreded by the dredging device 1 shown in FIG.

  In the dredging device 1, since the screen 3 includes the bottom plate 32, the dredging device 1 may be arranged so that the bottom plate 32 is placed on the earth or sand S as shown in FIG. 4. The dredging device 1 may be suspended with a slight gap between the earth and sand S and the bottom plate 32.

  Next, the motor M is driven to rotate the impeller 222 and water is ejected from the disturbance nozzle 35. When water is sprayed from the disturbance nozzle 35, the earth and sand S around the screen 3 is disturbed and rises. As described above with reference to FIG. 2 and the like, a spiral flow sucked into the pump casing 22 from the suction port 22A is generated by the rotation of the impeller 222, and accordingly, FIG. 2, FIG. 3 (B) and FIG. 4, a flow that enters the inflow portion 33 </ b> A from the periphery of the screen 3 occurs as indicated by a dotted arrow. As a result, the earth and sand S around the screen 3 smoothly enters the inflow portion 33A, passes through the inflow portion 33A, and is then sucked into the pump casing 22 together with water from the suction port 22A. Thereby, mud and sand S can be sucked in, suppressing turbidity. Further, as described above, the pair of disturbing nozzles 35 are slightly downward and inject water so as to approach the virtual circle rotating in the rotation direction of the impeller 222 in the forward direction. It is easy to smoothly enter the inflow portion 33A, and turbidity can be further suppressed. As a result, as shown in FIG. 4, earth and sand S around the screen 3 is removed.

  The earth and sand S sucked into the pump casing 22 together with water flows through the transport pipe 23 and is transported to the sand settling separator 8. Since an object larger than the mesh width of the screen 3 cannot pass through the inflow portion 33A and is captured by the screen 3, clogging of the pump casing 22 and the transport pipe 23 can be prevented.

  As shown in FIG. 1, the water containing the earth and sand S and the like that has been transported to the sand settling separator 8 through the transport pipe 23 is separated into water and the earth and sand S in the sand settling separator 8. The separated water is returned to the dam lake 91, and the separated earth and sand S is transported to a predetermined storage location. In addition, in order to prevent deterioration of the environment such as coastal erosion caused by damming up the earth and sand S by the dam, the separated earth and sand S may be returned to the downstream side of the dam 911.

  When dredging at a predetermined location is completed, the dredging device 1 is moved in the horizontal direction by moving the work boat 71, and dredging of soil and sand S in other areas is carried out. In addition, you may implement dredging work of a required area | region, moving slowly, without stopping the work ship 71. FIG. In the dredge apparatus 1, the earth and sand S around the screen 3 is sucked, and the earth and sand S around the screen 3 is removed as shown in FIG. For this reason, even when the dredge apparatus 1 is moved in the horizontal direction, it is less likely that the screen 3 scrapes up the earth and sand S, and the soil and sand S that has been swollen by continuing to drive the motor M also flows in. It flows into the portion 33A and is sucked from the suction port 22A. This also suppresses the occurrence of turbidity. Furthermore, in this embodiment, the top plate 31 is formed larger than the bottom plate 32, and the outer peripheral portion of the top plate 31 projects outward from the inflow portion 33A. For this reason, the earth and sand S do not easily rise upward from the top plate 31, and the occurrence of turbidity is further suppressed.

  As described above, in the dredging work using the dredging device 1, after the dredging device 1 is arranged so that the bottom plate 32 is placed on the earth and sand S or the like, the motor M is driven and water is sprayed from the disturbance nozzle 35, which is necessary. The work boat 71 may be moved according to the situation. For this reason, not only a special operation such as handling of the grab bucket becomes unnecessary, but also the dredging work can be performed with a very simple operation.

  Next, modifications of the screen shown in FIGS. 1 to 4 will be described. In the modified example described below and other embodiments described later, the differences from the first embodiment shown in FIGS. 1 to 4 will be mainly described, and the first embodiment shown in FIGS. The components having the same names as the component names in the embodiment will be described with the same reference numerals used so far, and duplicate descriptions may be omitted.

  FIG. 5A is a diagram corresponding to FIG. 3A in a modified example of the screen shown in FIGS. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line BB in FIG. In FIG. 5C, the central portion of the bottom plate 32 is omitted and enlarged.

  As shown in FIG. 5A, the screen 3 of the present modification has a bottom plate 32 having a diameter substantially the same as that of the top plate 31. The top plate 31, the bottom plate 32, and the plurality of screen bars 33 are not fixed by welding, and are integrated by bolts 34 with the plurality of screen bars 33 sandwiched between the top plate 31 and the bottom plate 32. ing.

  As shown in FIGS. 5B and 5C, the upper surface of the bottom plate 32 is formed with a slide groove 321 in which the lower end portions of the plurality of screen bars 33 are inserted, extending in the radial direction. Yes. The slide groove 321 is formed longer than the radial length of the screen bar 33. Although illustration is omitted, a slide groove corresponding to the slide groove 321 of the bottom plate 32 is formed on the lower surface of the top plate 31, and upper end portions of the plurality of screen bars 33 are respectively inserted.

  In the screen 3 shown in FIG. 5, each of the plurality of screen bars 33 is positioned on the innermost side of the slide groove 321, and a ring-shaped outer ring 36 is disposed outside the plurality of screen bars 33. The outer ring 36 is fixed to the bottom plate 32 by a second bolt 37. Thereby, each of the plurality of screen bars 33 is positioned in a state of being located on the innermost side of the slide groove 321. In the state of FIG. 5, both the inner eye width D1 and the outer eye width D2 of the inflow portion 33A are the smallest.

  FIG. 6 is a diagram showing a state in which the mesh width of the inflow portion 33A is increased in the screen 3 of the modification shown in FIG. FIG. 6A is a diagram corresponding to FIG. 5B, and FIG. 6B is a diagram corresponding to FIG. 5C.

  As shown in FIGS. 6A and 6B, the screen 3 has a plurality of screen bars 33 positioned on the outermost sides of the slide grooves 321, and has a ring shape inside the plurality of screen bars 33. An inner ring 38 is arranged. The inner ring 38 is fixed to the bottom plate 32 by a second bolt 37. Thereby, each of the plurality of screen bars 33 is positioned in a state of being located on the outermost side of the slide groove 321. In the state of FIG. 6, both the inner eye width D1 and the outer eye width D2 of the inflow portion 33A are the largest.

  If a mode in which the plurality of screen bars 33 can be slid in the radial direction as in the present modification, the size of the inner eye width D1 and the outer eye width D2 of the inflow portion 33A can be changed. Thereby, the size of the object flowing into the inflow portion 33A and the size of the object that passes through the inflow portion 33A and is sucked into the suction port (see FIG. 2 and the like) can be adjusted. Note that the slide groove 321 may be formed to the vicinity of the outer periphery of the bottom plate 32 to increase the amount of change in the inner eye width D1 and the outer eye width D2 of the inflow portion 33A. Further, by using the outer ring 36 having a small width and the inner ring 38 having a small diameter, the plurality of screen bars 33 can be positioned at intermediate positions in the radial direction of the slide groove 321.

  FIG. 7 is a view showing a second modification of the dredge apparatus 1 shown in FIG. In this 2nd modification, the point provided with the transfer member 4 mainly differs from the dredge apparatus 1 shown in FIG.

  As shown in FIG. 7, in the second modified example, the dredger device 1 is suspended by a crane 72 and disposed on the earth and sand S accumulated near the water intake port 911 </ b> A. The transfer member 4 includes a space forming member 41 extending in the horizontal direction toward the screen 3 of the dredger device 1, and a nozzle in which a tip portion is inserted from an end of the space forming member 41 opposite to the screen 3. 42 and a supply pipe 43 for supplying water to the nozzle 42. The supply pipe 43 is connected to a pump (not shown) that supplies water. The transfer member 4 includes a space forming member 41 and a nozzle 42 that are suspended by a work ship 71 by wires 712 and supported by an elevator 711 so as to be movable up and down.

  8 is a cross-sectional view taken along line CC in FIG.

  The space forming member 41 forms a space P in which a portion above the lower end portion is closed, and has a suction port 41A that opens downward. The nozzle 42 is provided with a discharge port 42A at its tip, and the nozzle 42 of this modification is formed by crushing a round pipe into a flat shape.

  When water supplied from the supply pipe 43 is discharged from the discharge port 42A, a pressure difference is generated between the inside and outside of the space forming member 41, and the accumulated earth and sand S is indicated by the curved arrows shown in FIG. Then, the air is sucked into the space P from the suction port 41A. Further, in the space P of the space forming member 41, the sucked earth and sand S and the like move toward the screen 3 by the flow of water discharged from the discharge port 42A. The earth and sand S moving in the space P is unlikely to go out of the space forming member 41 at the portion where the pressure difference is generated, and the rise of the earth and sand S is suppressed. Therefore, the earth and sand S can be transferred while collecting the earth and sand S around the screen 3 while suppressing turbidity caused by the rise of the earth and sand S.

  FIG. 9 is a plan view showing how the transfer member 4 shown in FIG. 7 is moved.

  By moving the work boat 71 shown in FIG. 7 or operating the elevator 711, the transfer member 4 is moved so as to rotate around the screen 3 of the dredger device 1 as shown in FIG. 9. Thereby, a wide range of earth and sand S can be collected around the screen 3 and can be dredged by the dredge device 1. In this modification, the sand pump 2 and the screen 3 may be fixedly installed at predetermined positions, and together with the transfer member 4, the sand pump 2 and the screen 3 in the same manner as in the first embodiment. The screen 3 may be moved. Further, if the position of the space forming member 41 is adjusted so that the suction port 41A of the space forming member 41 is slightly higher than the sediment S or the like S by the elevator 711 shown in FIG. It is possible to further suppress the rise of S such as earth and sand.

  Next, another embodiment will be described.

  FIG. 10 is a diagram schematically showing a state of the second embodiment in which the dredging device of the present invention is arranged in a dam lake equipped with a water channel type hydroelectric power generation facility.

  The dam lake 92 of the second embodiment is equipped with a water channel type hydroelectric power generation facility, and an intake channel 922 is provided upstream of the dam (not shown) as shown in FIG. A water intake 921 for intake channels is formed at the entrance. In FIG. 10, as shown by the white arrow, the water that has flowed from the intake channel 921 passes through the intake channel 924 and flows to the right side of the intake channel 922. Passed and supplied to the power plant.

  The dredging device 1 of this embodiment is disposed in the vicinity of the intake channel 921 for dredging sediment S and the like S accumulated on the upstream side of the intake channel dust remover 924 at the bottom 923 of the intake channel 922. In addition, as shown by a one-dot chain line in FIG. 10, the dredging device 1 is arranged on the downstream side of the water intake dust remover 924 and the sediment S or the like S deposited on the downstream side of the intake water dust remover 924 is dredged. It is good also as an aspect. In addition, in the aspect arrange | positioned downstream from the dust removal machine 924 for intake channels, the example provided with the transfer member 4 mentioned above and the dredge apparatus 1 supported by the heavy machine 73 is shown.

  FIG. 11 is a diagram schematically showing a state of the third embodiment in which the dredger of the present invention is arranged in a river. In rivers, it is necessary to drain the sediment deposited on the bottom of the river and flow water safely. Moreover, earth and sand may contain sludge that emits a bad odor, and periodic dredging is required.

  As shown in FIG. 11, the dredge apparatus 1 according to the third embodiment is disposed on the earth and sand S or the like S deposited on the river bottom 933 of the river 93 by the heavy machinery 73 disposed on the high waterbed 931. Depending on the form of the river 93 and the water level, the heavy machinery 73 may be disposed on a dike, a low water ledge or the like. In FIG. 11, the right side is the upstream side, and the water flows from the right side to the left side as indicated by the white arrow.

  In the river 93, the water level may be low, and a retractable weir 5 is provided on the downstream side to block the water and raise the water level. In the present embodiment, a rubber weir that inflates and stands up the bag body with air or water is adopted as the retractable weir 5. The means for damming water is not limited to the collapsible dam 5, and a water stop plate may be provided, or a sandbag or the like may be piled to dam the water.

  As an example of dredging work using the dredging device 1 of the third embodiment, as shown by a one-dot chain line in FIG. 11, when the water level WL is low, the retractable weir 5 is erected to stop the water. Is raised to a predetermined water level. Next, the motor M (see FIG. 2) is driven and water is jetted from the disturbance nozzle 35 (see FIGS. 3 and 4). The water level when the dredging operation is performed using the dredging device 1 is required to be a level at which at least the impeller 222 (see FIG. 2) is submerged. It is more preferable that the water level is such that the water is submerged. Moreover, the water sprayed from the disturbance nozzle 35 can utilize the water of the river upstream from the dredging device 1, for example. The dredged soil S or the like S may be returned to the downstream of the river 93 after being subjected to a treatment for removing sludge and the like.

  Depending on the river 93, it may be difficult to place or move the dredging device 1 on the earth or sand S from the heavy machinery 73 arranged on the high waterbed 931 or the like. Moreover, in order to lower the heavy machinery 73 into the river 93, there is a possibility that the work cost increases, for example, a dedicated large crane is required.

  FIG. 12 is a view showing a modified example provided with a moving mechanism of the scissor device shown in FIG. In addition, in FIG. 12, a mode that it cut | disconnected in the river width direction is shown, and the direction orthogonal to a paper surface becomes a flowing direction of a river.

  FIG. 12A shows a first modified example provided with the first moving mechanism 61. The first moving mechanism 61 includes a telescopic cylinder 611, a pulley 612, a rail 613, a belt 614 wound around a pair of pulleys 612, and a suspension depending on the belt 614. And a wire 615 for suspending the scissor device 1. Each of the pair of rails 613 is disposed so as to extend in the flowing direction of the river 93, and the cylinder 611 is slidably supported by the rails 613.

  The first moving mechanism 61 can move the dredger device 1 in the river width direction by rotating the pair of pulleys 612 and driving the belt 614. Further, by sliding the cylinder 611 along the rail 613, the dredger device 1 can be moved in the flow-down direction. Furthermore, the depth position of the saddle device 1 can be adjusted by expanding and contracting the cylinder 611.

  FIG. 12B shows a second modified example provided with a second moving mechanism 62 with a simplified configuration. The second moving mechanism 62 includes a support rod 621 that is stretched over the high water ridges 931 on both banks, and a second wire 622 that is wound around the support rod 621 and suspends the dredger device 1.

  The second moving mechanism 62 can move the dredger device 1 in the river width direction by pulling the second wire 622 or a rope (not shown) attached to the dredger device 1 itself. Moreover, the dredge apparatus 1 can also be moved in the flow direction by moving the support rod 621 in the flow direction. In addition, what is necessary is just to adjust the length of the 2nd wire 622 in order to change the depth position of the dredge apparatus 1. FIG.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope described in the claims. In the above-described embodiment, the sand pump 2 is used as the suction member, but the suction member is not particularly limited. For example, an ejector-type jet pump that injects high-pressure water from a nozzle and sucks soil and the like S from the suction port 22A, or a suction member that sucks soil and sand S from the suction port 22A by a siphon action utilizing a water level difference may be adopted. Good.

  In the above-described embodiment, the disturbance nozzle 35 is attached to the top plate 31 of the screen 3. However, the position of the disturbance nozzle 35 is not limited. For example, the disturbance nozzle 35 may be attached to the bottom plate 32 of the screen 3 or may be provided at a position slightly away from the screen 3 around the screen 3. The fluid ejected from the disturbance nozzle 35 is not limited to water but may be a gas such as air.

  Furthermore, although the above-mentioned embodiment demonstrates the example which provided the dredging apparatus 1 in the dam lake 91 provided with the dam type hydroelectric power generation equipment, and the dam lake 92 provided with the waterway type hydroelectric power generation equipment, The dredging device 1 of the invention can also be applied to a dam lake equipped with a dam waterway type hydroelectric power generation facility. In this case, the dredging device 1 may be arranged in the vicinity of the dam intake and the intake channel.

  The dredging device 1 of the present invention can also be used for dredging such as sediment deposited on the ocean, in particular, sediment deposited on the seabed of a harbor, and sediment collected around a water intake facility that takes in cooling water of a nuclear power generation facility. . Furthermore, the dredging device 1 of the present invention can also be used for removing earth and sand deposited on the bottom of an outdoor swimming pool, the bottom of a pool for storing cooling water of a nuclear power generation facility, and the like.

  Furthermore, in the above-described embodiment, the mode in which the dredger device 1 is lifted by the work boat 71, the crane 72, the heavy machine 73, or the like has been described as an example. However, the dredger device 1 is lifted by using a small drone. Moreover, you may employ | adopt the aspect which moves.

  Note that even if the configuration requirement is included only in any of the embodiments and any of the modifications described above, the configuration requirements may be applied to other embodiments and other variations.

DESCRIPTION OF SYMBOLS 1 Dredge 2 Pumping sand pump 21 Motor accommodating part 22 Pump casing 22A Suction port 3 Screen 31 Top plate 32 Bottom plate 33 Screen bar 33A Inflow part 35 Disturbing nozzle 4 Transfer member 41 Space formation member 41A Suction port 42 Nozzle 42A Discharge port 91, 92 Dam Lake 911A Water intake 913 Lake bottom 921 Water intake 923 Water bottom 93 River 933 River bottom

Claims (6)

A dredge device that includes a suction member having a suction port that opens downward and is disposed in water, and a screen that is disposed below the suction port, and sucks objects deposited on the bottom of the water from the suction port. In
The screen
A bottom plate facing the suction port at an interval in the vertical direction;
It has an inflow part through which an object smaller than the mesh width opens laterally between the suction port and the bottom plate,
The scissor device, wherein the suction port sucks an object that has passed through the inflow portion. The screen has a plurality of screen bars extending radially around a lower region of the suction port,
2. The scissor device according to claim 1, wherein the inflow portion is formed between the plurality of screen bars, and the eye width increases from the inside toward the outside.   The scissor apparatus according to claim 2, wherein the plurality of screen bars slide in an extending direction to change the size of the eye width. The suction member is a sand pump;
The sand pump is
A casing having the suction port;
An impeller that is housed in the casing and rotates about a vertical axis;
The object sucked into the casing from the suction port has a transport pipe that is transported toward the outside,
The dredge device according to any one of claims 1 to 3, wherein the impeller is disposed at a position deviating from a center line of a path connecting the transport pipe and the suction port.   The dredge apparatus according to claim 1, further comprising a disturbance nozzle that discharges fluid around the screen. A transfer member for transferring an object deposited on the water bottom toward the screen;
The transfer member is
A space forming member that extends toward the screen, forms a space in which an upper end portion is closed, and is provided with a suction port below the upper end portion;
A discharge port for discharging fluid into the space from the opposite side of the screen toward the screen;
The suction port functions as an opening that sucks an object deposited on the water bottom into the space by discharging fluid from the discharge port;
2. The space forming member functions as a path for moving an object sucked into the space toward the screen when fluid is discharged from the discharge port. The scissor device according to any one of 5.

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