JP2009091842A - Vortex sand discharging device and sand discharging method using the vortex sand discharging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vortex sand discharging pipe for discharging sand and sediment or the like accumulated around the vortex sand discharging pipe while operating a generator in a hydroelectric power plant, and a vortex sand discharging device, and a sand discharging method. <P>SOLUTION: The vortex sand discharging device 3 for discharging the sand and sediment 2 or the like accumulated in a sand basin 1 for the hydroelectric power plant is provided with the vortex sand discharging pipe 7 installed on the bottom of the sand basin 1 and having a plurality of slits 5 making the sand and sediment 2 or the like flow into the pipe, an opening and closing member 9 inserted slidably into the vortex sand discharging pipe 7 to open and close the slits 5 freely, and a controller 11 for making the opening and closing member 9 slide with respect to the vortex sand discharging pipe 7 to open and close the slits 5 freely. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vortex sand discharging device for discharging earth and sand accumulated at the bottom of a sand basin and a sand discharging method using the vortex sand discharging device, and in particular, around a vortex sand discharging pipe without shutting off water in a water channel. The present invention relates to a vortex sand removal apparatus and a sand removal method capable of reliably discharging soil and sand.

Sand and sand etc. flow into the waterway that supplies the river water to the hydroelectric power plant, so a part of the waterway is widened in the middle of the waterway to reduce the flow rate of the water and sink the sand and sand in the running water. Is provided. As a sand discharging technique for discharging earth and sand accumulated at the bottom of the sand basin, the present inventors, for example, in Patent Document 1, a method of installing a vortex sand pipe having a slit at the bottom of the sand basin Disclosed. This is because the vortex sand pipe installed at the bottom of the sand settling basin is provided with a plurality of slits at predetermined intervals, and the sediment accumulated on the vortex sand pipe is sucked into the vortex sand pipe through the slits. It is discharged downstream. At this time, as shown in FIG. 12, the earth and sand deposited on the vortex sand discharge pipe is discharged in a mortar shape according to the angle of repose θ in water.
JP 2005-146603 A

  In the case where the vortex sand pipe described in Patent Document 1 described above is installed in a large sand basin for a hydropower station or the like, it is desirable to increase the slit arrangement interval in order to increase the effective vortex pipe length. However, when the interval between the slits is increased, there has been a problem that the earth and sand between the slits on the vortex sand pipe remain on the vortex sand pipe without being drained.

  In order to remove the sand and sand remaining between the slits, the inside of the water channel was cut off, and a person entered the water channel and discharged the remaining sand and sand manually. Therefore, there is a problem that much labor and time are required.

  Furthermore, when a person performs sand discharge work in a water channel, all the water in the water channel is drained, so that water cannot be supplied to the generator connected to this water channel. Therefore, when discharging the sediment in the sand basin, the generator has to be stopped, and there is a problem that the operating rate of the generator decreases.

  Therefore, the present invention has been made in view of the above-described problems, and removes sand and the like accumulated around the vortex sand pipe and removes sand while operating the generator of the hydroelectric power plant. It is an object of the present invention to provide a vortex sand removal pipe, a vortex sand removal apparatus, and a sand removal method.

  The vortex sand removal apparatus of the present invention that solves the above problem is a vortex sand removal apparatus that discharges earth and sand accumulated in a sand basin, and is provided at the bottom of the sand basin and includes a plurality of slits through which the earth and sand flows. And a control device that controls the opening / closing operation of the opening / closing material (first invention). ).

  A second invention is characterized in that, in the first invention, the apparatus further comprises a discharge processing section for sucking the earth and sand into the vortex sand pipe and discharging it to the outside of the vortex sand pipe.

  A third invention is characterized in that, in the first or second invention, a cylindrical tube having slits having substantially the same shape as the slits of the vortex sand discharging tube but having different arrangement intervals is used as the opening / closing material.

  A fourth invention is characterized in that, in the first or second invention, a cylindrical tube having a slit having a shape substantially the same as that of the slit of the vortex sand removal tube and having a different arrangement pattern is used as the opening / closing member.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, the opening / closing material is slidable in an axial direction or a circumferential direction of the vortex sand removal pipe.

  According to a sixth invention, in any one of the first to fifth inventions, the control device slides the opening / closing material to open / close the slit, and driving means for driving the sliding means It is characterized by providing.

  The sand discharge method of the seventh invention is a vortex sand pipe having a plurality of slits which are installed at the bottom of a sand basin and into which earth and sand etc. flows, and an opening / closing material which is disposed in the vortex sand pipe and opens and closes the slits. And a sand discharging method for discharging the earth and sand accumulated in the sand settling basin using a vortex sand discharging device comprising a control device for controlling the opening and closing operation of the opening and closing material, and opening and closing the slits in a predetermined order. The soil or the like flows into the vortex sand pipe and is discharged.

  The eighth invention uses the vortex sand removal apparatus according to the seventh invention, wherein the eddy sand removal apparatus further includes a discharge processing section that sucks the earth and sand into the vortex sand discharge pipe and discharges the eddy sand discharge pipe to the outside. In the sand discharging method for discharging the earth and sand accumulated in the sand settling basin, the earth and sand are sucked into the vortex sand discharging pipe.

  According to the present invention, an opening / closing material is provided in the vortex sand removal pipe, and a control device for controlling the opening / closing operation of the opening / closing material is provided, so that the slit can be selected and opened / closed. Accordingly, it is possible to select a slit that is appropriately opened according to the accumulation condition of earth and sand, and to efficiently drain the earth and sand.

  According to the present invention, a cylindrical opening / closing material having slits having the same shape as the slits of the vortex sand removal pipe but having different arrangement intervals and arrangement patterns is arranged in the vortex sand removal pipe and opened and closed by the control device. A plurality of slits can be opened and closed simultaneously by sliding the material in the axial direction or circumferential direction with respect to the vortex sand pipe.

  Also, by sliding the opening and closing material, the number of slits to be opened by the vortex sand removal pipe can be changed while the number of slits to be opened and closed can be changed. The arrangement interval can be made shorter than the predetermined interval. Therefore, the sand and sand around the vortex sand pipe can be efficiently discharged at short intervals. In other words, since it is possible to reliably discharge the sediment and the like accumulated around the vortex sand pipe, it is not necessary to stop the water in the water channel and for the person to enter the water channel and discharge the soil and the like.

  And it becomes unnecessary to drain all the water in a waterway, and it becomes possible to discharge earth and sand etc. in the state which made water flow in a waterway. Accordingly, it is possible to supply water to the generator by discharging water into the water channel at the same time as discharging earth and sand, and it is possible to operate the generator even when earth and sand are discharged.

  Furthermore, by providing a discharge processing unit that sucks out sediment and the like and discharges it to the outside of the vortex sand pipe, the accumulated sediment is efficiently introduced into the vortex sand pipe and discharged out of the vortex sand pipe. It becomes possible.

  By using the eddy sand removal device according to the present invention, it is possible to efficiently discharge the earth and sand deposited around the vortex sand removal pipe and to operate the generator of the hydroelectric power plant. In addition, since the sediment deposited around the vortex sand pipe can be reliably discharged, it is not necessary for the person to enter the waterway to perform the discharge work of the soil and the like, and the labor and cost can be reduced. Become.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a vortex sand discharging apparatus according to a first embodiment of the present invention, and FIG. 2 is a view taken along the line A-A ′ of FIG. 1. Moreover, FIG. 3 is a figure which shows the vortex sand pipe which concerns on this embodiment, and FIG. 4 is a figure which shows the opening / closing material which concerns on this embodiment.

  As shown in FIG. 1 and FIG. 2, a vortex sand discharger 3 for discharging earth and sand 2 accumulated in a sand basin 1 for a hydroelectric power station is installed at the bottom of the sand basin 1 and has a slit 5 through which the earth and sand 2 flows. A plurality of vortex sand removal pipes 7, an opening / closing material 9 that is slidably inserted into the vortex sand removal pipe 7, and the slit 5 can be opened and closed, and the opening / closing material 9 is vortexed so that the slit 5 can be opened and closed. And a control device 11 to be slid with respect to the sand discharge pipe 7.

  As shown in FIG. 3, the vortex sand removal pipe 7 is a cylindrical pipe having a plurality of slits 5 in the axial direction. In the present embodiment, for example, a steel pipe is used. In the present embodiment, the slit 5 of the vortex sand removal pipe 7 is calculated by design in advance. For example, the predetermined width W is 5 cm, the predetermined length L is 20 cm, and the distance between the centers is a predetermined interval P (described later). ) Half of 100) and a predetermined diameter D of 20 cm.

  As shown in FIG. 4, the opening / closing member 9 is a cylindrical tube having a plurality of slits 10 in the axial direction. In the present embodiment, for example, a steel tube is used. In the present embodiment, the length and width of the slit 10 of the opening / closing material 9 are the same as the slit 5 of the vortex sand pipe 7, and the distance between the centers is 200 cm with a predetermined interval P.

  The predetermined length L, the predetermined width W, and the predetermined interval P of each of the slits 5 and 10 of the vortex sand discharge pipe 7 and the opening / closing material 9 are the diameter of the vortex sand discharge pipe 7, the sediment flow rate capable of sand removal, the earth and sand. Based on the particle size of 2 etc., it is calculated by design in advance, and is appropriately changed according to each field condition.

  The control device 11 has one end connected to the end of the opening / closing material 9, a sliding means 13 that slides the opening / closing material 9 in the axial direction with respect to the vortex sand discharge pipe 7, and a drive that drives the sliding means 13. Means 15. In this embodiment, the sliding means 13 uses a hydraulically extendable cylinder, and the driving means 15 uses a hydraulic pump that generates an operating pressure of the cylinder.

  Then, the opening / closing member 9 is slid in the axial direction, and the position of the slit 10 of the opening / closing member 9 and the position of the slit 5 of the vortex sand removal pipe 7 are matched to each other. Is allowed to flow into the vortex sand pipe 7 and discharged.

Next, a sand discharging method using the above-described vortex sand discharging device 3 will be described.
FIG. 5 is a diagram illustrating a sand removal method according to the present embodiment. As shown in FIG. 5, in this embodiment, for example, an sediment having a length of 10 m, a width of 2 m, and a water depth of 2 m is accumulated in a sand basin 1 having a thickness of 30 cm, and the average particle size of the sediment is discharged. A case where the thickness is 1 mm will be described.

First, the effective vortex tube length is calculated by the following formula.
From the continuity formula:
dQ / dx = q (Formula 1)
From the equation of motion,
β / gA ² · dQ ² / dx + d (p / w + z) / dx
−U / gA · dQ / dx + fQ ² / 2gDA ² = 0 (Formula 2)
Here, Q: flow rate in the vortex tube (m ³ / s), q: inflow amount per unit length flowing into the vortex tube (m ² / s), U: cross-sectional average flow velocity (m / s) in the vortex tube , A: sectional area of the vortex tube (m ² ), x: distance in the flow direction along the vortex sand pipe 7 axis (m), g: gravitational acceleration (m ² / s), P: pressure at the center of the tube ( Pa), w: unit volume weight (kg / m ³ ) of fluid, z: height of tube center axis from reference plane (m), D: diameter of tube (m), f: coefficient of friction.

  The effective vortex tube length in this embodiment calculated from Equation 1 and Equation 2 is 8.2 m, and the slit is 9 for each of the vortex sand discharge tube 7 and the opening / closing material 9 based on the predetermined length L and the predetermined interval P. And 5 each.

Next, the control device 11 is operated to slide the opening / closing member 9 in the axial direction, so that the position of the slit 10 of the opening / closing member 9 and the position of the slit 5a of the vortex sand removal pipe 7 are matched. At this time, all the slits 5b adjacent to the opened slit 5a are closed. Then, the earth and sand 2 above the slit 5a is discharged into the vortex sand discharge pipe 7. By this first sand removal, approximately 0.25 m ^{3 of} sand and sand 2 in a mortar-like range with the angle of repose θ underwater of 30 ° to 40 ° facing upward is removed.

FIG. 6 is a diagram illustrating a sand removal method according to the present embodiment. As shown in FIG. 6, the control device 11 is operated again to slide the opening / closing material 9 in the axial direction (right direction in the drawing), and the position of the slit 10 of the opening / closing material 9 and the first sand removal described above are performed. The position of the slit 5b adjacent to the position of the slit 5a of the vortex sand pipe 7 that has been opened is made coincident. At this time, all the slits 5a of the vortex sand discharging pipe 7 opened at the time of the first sand discharging are closed. Then, the earth and sand 2 above the slit 5b opened this time is discharged into the vortex sand pipe 7. As in the first time, sand removal in the mortar-shaped range with the angle of repose θ underwater of 30 ° to 40 °, etc. 2 is removed by the second sand removal, and the sand removal in the first and second times. The total amount is about 0.5 m ³ . In these two times of sand removal, most of the earth and sand 2 deposited above the vortex sand pipe 7 flows into the vortex sand pipe 7 through the slits 5 and 10 and is discharged.

  According to the vortex sand removal apparatus 3 of the present embodiment described above, the cylindrical opening / closing material having the slits 10 having the same shape as the slits 5 of the vortex sand removal pipe 7 and different arrangement intervals in the vortex sand removal pipe 7. 9 is arranged, and the position of the slit 5 to be opened and closed can be changed by sliding the opening and closing member 9 in the axial direction with respect to the vortex sand pipe 7 by the cylinder 13 and a plurality of slits. 5 can be opened and closed simultaneously.

  Further, according to the present embodiment, the number of slits 10 and the arrangement interval of the opening / closing material 9 are set to a predetermined number of 5 calculated in advance by design or the like, and the opening / closing material 9 is pivoted to a predetermined interval P of 200 cm. By sliding in the direction, the number of slits 5 to be opened by the vortex sand pipe 7 remains five, and the positions of the slits 5 to be opened can be alternated. 5 can be set to 100 cm shorter than the predetermined interval P. Therefore, the sand and the like 2 around the vortex sand discharging pipe 7 can be efficiently discharged at short intervals.

  Furthermore, according to this embodiment, in order to be able to reliably discharge the earth and sand 2 accumulated around the vortex sand discharge pipe 7, the water channel is shut off, and a person enters the water channel to enter the sand and sand. Etc. 2 need not be discharged. Therefore, it is not necessary to drain all the water in the water channel, and it is possible to discharge the earth and sand 2 in a state where water is allowed to flow in the water channel. That is, it is possible to supply water to the generator by flowing water into the water channel at the same time as the earth and sand 2 is discharged, and the generator can be operated even when the earth and sand 2 is discharged. In addition, it is not necessary for a person to enter the waterway and perform the work of discharging earth and sand 2 and the like, and labor and cost can be reduced.

  In this embodiment, the distance between the slit centers of the opening / closing member 9 and the vortex sand removal pipe 7 and the number of slits are 5 for 200 cm and 9 for 100 cm, respectively, and effective vortex is generated by performing sand removal twice. Although the method for removing the sand and the like 2 on the vortex sand discharging pipe 7 corresponding to the pipe length of 8.2 m has been described, the present invention is not limited to this, and the number of slits of the opening / closing material 9 is a predetermined number of 5 pieces. For example, if the distance between the slit centers of the opening / closing material 9 is 400 cm, the distance between the slit centers of the vortex sand discharge pipe 7 and the number of slits are each 100 cm, the opening / closing material 9 is slid in the axial direction. Then, by performing sand removal four times, the length of the vortex sand removal pipe 7 may be 16.4 m, which is twice the effective vortex pipe length. By using the method of increasing the number of sand discharges in this way, the length of the vortex sand discharge pipe 7 can be increased, so that a wide range of earth and sand 2 or the like accumulated at the bottom of the sand basin 11 can be discharged. It becomes possible.

  In this embodiment, the method of using a cylinder as the sliding means 13 and using a hydraulic pump as the driving means 15 has been described. However, the present invention is not limited to this, and the opening / closing material 9 can be slid. Any other method may be used.

  Next, a second embodiment of the present invention will be described. In the following description, parts corresponding to those using the same configuration as in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.

  FIG. 7 is a plan view showing the vortex sand discharging device 23 according to the second embodiment of the present invention, and FIG. 8 is a view taken along the arrow B-B ′ in FIG. 7. Moreover, FIG. 9 is a figure which shows the opening / closing material 29 which concerns on this embodiment.

  As shown in FIG. 7 to FIG. 9, the vortex sand removal device 23 has a lattice shape in the axial direction instead of the opening / closing material 29 having the slits 10 linearly arranged in the axial direction described in the first embodiment. And an opening / closing member 29 having a slit 10 disposed in the cylinder, and a motor 35 with a speed reducer 33 instead of a sliding device composed of a cylinder 13 and a hydraulic pump 15.

  The opening / closing material 29 is a steel pipe having a plurality of slits 10 arranged in a grid in the axial direction, and the length and width of the slit 10 are the same as the slit 5 of the vortex sand discharge pipe 7 as in the first embodiment. is there. In addition, the distance between the slit centers of one slit group 10A arranged linearly in the axial direction among the plurality of slits 10 arranged in a lattice shape is set to 200 cm of a predetermined interval P. On the other hand, the distance between the slit centers of other slit groups 10B arranged linearly in the axial direction at a predetermined angle in the circumferential direction is also set to 200 cm, which is a predetermined interval P. Here, the distance in the axial direction between the center of the slit 10 of the other slit group 10B and the center of the slit 10 of the adjacent slit group 10A is 100 cm, which is half the predetermined interval P.

  The control device 31 has one end connected to the end of the opening / closing material 29, a sliding means 33 that slides the opening / closing material 29 in the circumferential direction with respect to the vortex sand discharge pipe 7, and a drive that drives the sliding means 33. Means 35. In this embodiment, the driving means 35 uses a motor, and the sliding means 33 uses a speed reducer that reduces the rotational speed of the motor.

  Then, the opening and closing member 29 is slid in the circumferential direction, and the position of the slit 10 of the opening and closing member 29 and the position of the slit 5 of the vortex sand discharging pipe 7 are matched to each other. Is allowed to flow into the vortex sand pipe 7 and discharged.

Next, a sand removal method using the vortex sand removal device 23 described above will be described.
FIG.10 and FIG.11 is a figure which shows the sand removal method which concerns on this embodiment. As shown in FIG. 10, in this embodiment as well, as in the first embodiment, for example, the sediment 2 having a thickness of 30 cm is deposited in the sand basin 11 having an extension of 10 m, a width of 2 m, and a water depth of 2 m, The case where the average particle diameter of the earth and sand discharged is 1 mm and the effective vortex tube length is 8.2 m will be described.

  In the axial direction of the opening / closing material 9, five slits 10 are provided in one slit group 10 </ b> A and five in the other slit group 10 </ b> B, a total of ten slits 10.

  Then, the control device 31 is operated to slide the opening / closing member 29 in the circumferential direction so that the position of the slit 10 of the slit group 10A of the opening / closing member 29 and the position of the slit 5a of the vortex sand pipe 7 are matched. At this time, all the slits 5b adjacent to the opened slit 5a are closed. Then, the earth and sand 2 above the slit 5a is discharged into the vortex sand discharge pipe 7.

  Next, as shown in FIG. 11, the control device 31 is operated to slide the opening / closing material 29 in the circumferential direction by a predetermined angle, and the position of the slit 10 of the other slit group 10B of the opening / closing material 29 and the above-described 1 The position of the slit 5b adjacent to the position of the slit 5a of the vortex sand discharge pipe 7 opened by the second sand discharge is made coincident. At this time, all the slits 5a of the vortex sand discharging pipe 7 opened at the time of the first sand discharging are closed. Then, the earth and sand 2 above the slit 5b opened this time is discharged into the vortex sand pipe 7.

  According to the vortex sand removal apparatus 23 of the present embodiment described above, the cylindrical opening / closing material having the slits 10 having the same shape as the slits 5 of the vortex sand removal pipe 7 and different arrangement intervals in the vortex sand removal pipe 7. 29 and the position of the slit 5 to be opened and closed can be changed by sliding the opening and closing member 29 in the circumferential direction with respect to the vortex sand pipe 7 by the motor 35 with the speed reducer 33. The plurality of slits 5 can be opened and closed simultaneously.

  Further, according to the present embodiment, the arrangement interval of the slits 10 of the opening / closing material 29 and the number of the slits 10 of the slit group are set to a predetermined interval P of 200 cm and a predetermined number of 5 calculated in advance by design or the like. By sliding the opening / closing material 29 in the circumferential direction, the number of slits 5 to be opened by the vortex sand removal pipe 7 remains five, and the positions of the slits 5 to be opened can be alternated. The arrangement interval of the slits 5 of the sand discharge pipe 7 can be set to 100 cm shorter than the predetermined interval P. Therefore, the sand and the like 2 around the vortex sand discharging pipe 7 can be efficiently discharged at short intervals.

  Furthermore, according to the present embodiment, since it is possible to reliably discharge the earth and sand 2 accumulated around the vortex sand pipe 7, it is not necessary to shut off the water channel, and the earth and sand 2 is discharged. At the same time, it is possible to supply water to the generator by flowing water into the water channel. In addition, it is not necessary for a person to enter the waterway and perform the work of discharging earth and sand 2 and the like, and labor and cost can be reduced.

  In this embodiment, the number of slit groups of the opening / closing material 29, the distance between the slit centers, and the number of slits are 2 groups, 200 cm and 5 respectively, and the distance between the slit centers of the vortex sand pipe 7 and the number of slits are respectively set. The method of sand removal such as earth and sand 2 on the vortex sand pipe 7 corresponding to 8.2 m of the effective vortex pipe length by performing sand removal twice with 100 cm, 9 pieces is limited to this. If the number of slits provided in the slit group of the opening / closing material 29 is kept to a predetermined number of 5, for example, the number of slit groups of the opening / closing material 29 and the distance between the slit centers are set to 4 groups and 200 cm, respectively. By making the distance between the slit centers of the vortex sand pipe 7 and the number of slits 100 cm and 18, respectively, and sliding the opening and closing material 29 in the circumferential direction, the sand evacuation sand pipe is carried out four times. Length of 7 It may be two times the 16.4m of effective vortex tube length. By using the method of increasing the number of sand discharges in this way, the length of the vortex sand discharge pipe 7 can be increased, so that a wide range of earth and sand 2 or the like accumulated at the bottom of the sand basin 11 can be discharged. It becomes possible.

  In the present embodiment, a method of using a motor as the driving means 35 and using a speed reducer as the sliding means 33 has been described. However, the present invention is not limited to this, and the opening / closing material 29 can be rotated. Other methods may be used as long as they are present.

  In all the embodiments described above, the vortex sand pipe 7 and the opening / closing material 29 have been described using steel pipes. However, the present invention is not limited to this, and for example, a vinyl chloride pipe or the like may be used.

  Moreover, in all the embodiments described above, a method is used in which earth and sand 2 are sucked into the vortex sand pipe 7 and a discharge processing unit (not shown) for discharging the eddy sand pipe 7 to the outside is provided. May be.

It is a top view which shows the eddy sand removal apparatus which concerns on 1st embodiment of this invention. It is an A-A 'arrow line view of FIG. It is a figure which shows the vortex sand removal pipe | tube concerning this embodiment. It is a figure which shows the opening / closing material which concerns on this embodiment. It is a figure which shows the sand removal method which concerns on this embodiment. It is a figure which shows the sand removal method which concerns on this embodiment. It is a top view which shows the eddy sand removal apparatus which concerns on 2nd embodiment of this invention. It is a B-B 'arrow line view of FIG. It is a figure which shows the opening / closing material which concerns on this embodiment. It is a figure which shows the sand removal method which concerns on this embodiment. It is a figure which shows the sand removal method which concerns on this embodiment. It is a figure which shows the sand removal conditions, such as earth and sand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sedimentation basin 2 Sediment etc. 3 Eddy sand removal device 5 Slit 7 (vortex sand removal pipe) Slit 7 Eddy sand removal pipe 9 Opening and closing material 10 (Opening and closing material) Slit 10A One slit group 10B Other slit group 11 Control device 13 Sliding Driving means 15 Driving means 23 Vortex sand removal device 29 Opening and closing material 31 Control device 33 Sliding means 35 Driving means W Predetermined width L Predetermined length P Predetermined distance D Predetermined diameter

Claims (8)

A sand discharger that discharges earth and sand accumulated in a sand basin,
An eddy sand pipe installed at the bottom of the sand basin and having a plurality of slits for allowing the earth and sand to flow in;
An opening / closing material disposed in the vortex sand pipe and opening / closing the slit;
A vortex sand removal device comprising: a control device that controls an opening / closing operation of the opening / closing material.   The eddy sand discharging apparatus according to claim 1, further comprising a discharge processing unit that sucks the earth and sand into the vortex sand discharging pipe and discharges the earth and sand to the outside of the vortex sand discharging pipe.   The eddy sand discharging apparatus according to claim 1 or 2, wherein a cylindrical pipe having slits having substantially the same shape as the slit of the vortex sand discharging pipe and having different arrangement intervals is used as the opening / closing material.   The eddy sand discharging apparatus according to claim 1 or 2, wherein a cylindrical pipe having slits having substantially the same shape and different arrangement pattern as the slit of the vortex sand discharging pipe is used as the opening / closing material.   The eddy sand removal apparatus according to any one of claims 1 to 4, wherein the opening / closing material is slidable in an axial direction or a circumferential direction of the vortex sand removal pipe.   The said control apparatus is provided with the sliding means which opens and closes the said slit by sliding the said opening-and-closing material, and the drive means which drives this sliding means, The one in any one of Claims 1-5 characterized by the above-mentioned. Vortex sand removal device. A vortex sand removal pipe installed at the bottom of the sand settling basin and having a plurality of slits through which dirt and the like flow in, an opening / closing material disposed in the vortex sand removal pipe for opening and closing the slit, and an opening / closing operation of the opening / closing material are controlled. In the sand discharging method for discharging the earth and sand accumulated in the sand basin using a vortex sand discharging device provided with a control device for
A sand discharging method, wherein the sand and the like are caused to flow into the vortex sand discharging pipe and discharged by opening and closing the slits in a predetermined order. While discharging the earth and sand accumulated in the sand settling basin using the eddy sand discharging apparatus further comprising a discharge processing unit that sucks the earth and sand into the vortex sand discharging pipe and discharges it outside the vortex sand discharging pipe. In the sand method,
The sand discharging method according to claim 7, wherein the sand or the like is sucked into the vortex sand discharging pipe.

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