Continuous sand washing structure, system and method

Abstract

The application relates to the technical field of water conservancy and hydropower facilities, and discloses a continuous sand flushing structure, system and method, the continuous sand flushing structure comprising a pool box, a sand flushing main corridor, a first sand flushing branch corridor, a second sand flushing branch corridor, a first gate and a second gate, the pool box comprising a water inlet section, an upstream connecting section, a working section, a downstream connecting section and a sand discharge section which are sequentially arranged along the water flow direction, the sand flushing main corridor, the first sand flushing branch corridor and the second sand flushing branch corridor being arranged at the bottom of the pool box, the first gate being arranged in the first sand flushing branch corridor, and the second gate being arranged in the second sand flushing branch corridor, the first gate and the second gate being standby gates for each other, if one sand flushing branch corridor is blocked or needs to be maintained, the corresponding gate of the branch corridor can be closed, the gate of the other sand flushing branch corridor is kept open, the continuous sand flushing structure can continuously flush sand and supply water without stopping work, and the subsequent work process of the power station is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water conservancy and hydropower facilities, in particular to a continuous sand flushing structure, system and method. BACKGROUND

[0002] In the water conservancy and hydropower engineering, when the natural river water is used for power generation or irrigation, some silt will inevitably be mixed in. If the silt is not pre-deposited and discharged at the water intake, the silt entering the water diversion system of the hydropower station will cause channel silting, pipeline blockage, and turbine wear and tear, etc. Currently, a sand settling tank is usually set after the water intake and before the water conveyance tunnel to intercept, deposit and discharge the silt.

[0003] In the prior art, a continuous flushing type sand settling tank is usually used to continuously flush the sand by using the pressure water flow in the pool bottom sand flushing channel. The sand settling, sand flushing and water supply of the continuous flushing type sand settling tank can be carried out at the same time, but the structure is relatively complex, and when the water flow has a large amount of silt, silting will easily occur in the pool chamber of the sand settling tank. If the sand settling tank is blocked due to silting, the work process will be affected because the sand settling tank needs to be cleaned and maintained. SUMMARY

[0004] Therefore, the present application provides a continuous sand flushing structure, system and method to solve the problem that the work process is affected because the sand settling tank needs to be cleaned and maintained when the sand settling tank is blocked due to silting in the prior art.

[0005] In a first aspect, the present application provides a continuous sand flushing structure, which comprises a pool box, a sand flushing main corridor, a first sand flushing branch corridor, a second sand flushing branch corridor, a first gate and a second gate. The pool box comprises a water inlet section, an upstream connecting section, a working section, a downstream connecting section and a sand discharge section which are sequentially arranged along the water flow direction. The sand flushing main corridor is arranged at the bottom of the pool box and extends from the upstream connecting section to the working section. The first sand flushing branch corridor is arranged at the bottom of the pool box and extends from the working section to the sand discharge section. The second sand flushing branch corridor is arranged at the bottom of the pool box, arranged in parallel with the first sand flushing branch corridor, and extends from the working section to the sand discharge section. The first gate is arranged in the first sand flushing branch corridor, and the second gate is arranged in the second sand flushing branch corridor.

[0006] Advantages: The first sand flushing branch corridor and the second sand flushing branch corridor are arranged, and the first gate and the second gate are arranged in the first sand flushing branch corridor and the second sand flushing branch corridor respectively. When one of the sand flushing branch corridors is blocked or needs to be maintained, the corresponding gate of the sand flushing branch corridor can be closed, and the gate of the other sand flushing branch corridor can be kept open. Therefore, the continuous sand flushing structure can continuously flush sand and supply water without stopping work, which does not affect the subsequent work process such as power generation of the power station. The continuous sand flushing structure has the advantages of simple structure, convenient operation, flexible sand flushing, and small influence on the subsequent work process.

[0007] In an alternative embodiment, a cover plate is arranged in the pool box, the cover plate divides the pool box into a water passing corridor and a sand flushing main corridor, the sand flushing main corridor is below the cover plate, and a plurality of sand setting holes are arranged on the cover plate.

[0008] Beneficial effects: the cover plate is arranged, when the horizontal flow velocity of the silt particles in the water flow is less than the vertical flow velocity, the silt particles will deposit downward, and enter the sand flushing corridor through the sand setting holes on the cover plate, and the clean water with a faster flow velocity in the water flow flows to the water using equipment through the water passing corridor, so that the application has the advantages of simple structure, good silt setting effect, and high water cleanliness.

[0009] In an alternative embodiment, the pool box is a straight wall and vault lining structure.

[0010] Beneficial effects: the straight wall and vault lining structure has the advantages of large drainage capacity, good seismic performance, high bearing capacity, and low construction difficulty, and reduces the construction and building cost.

[0011] In an alternative embodiment, the bottom of the water passing corridor is inclined.

[0012] Beneficial effects: the bottom of the water passing corridor is arranged as an inclined surface, so that the silt particles in the water flow flow downward into the sand flushing corridor, and the silt is prevented from depositing in the water passing corridor.

[0013] In an alternative embodiment, the continuous sand flushing structure further comprises a flow regulating section, and the flow regulating section is connected to the upstream connecting section and the working section.

[0014] Beneficial effects: the flow regulating section is arranged, so that the rotational flow velocity of the water flow is effectively reduced, the water flow is slowed down, and the silt particles are more easily deposited on the bottom, thereby improving the sand flushing effect.

[0015] In an alternative embodiment, the water inlet section is sequentially provided with a third gate and a fourth gate along the water flow direction.

[0016] In an alternative embodiment, the downstream connecting section is provided with a fifth gate.

[0017] In an alternative embodiment, the continuous sand flushing structure further comprises a water conveying tunnel, and the water conveying tunnel is arranged at the end of the downstream connecting section.

[0018] In a second aspect, the application further provides a continuous sand flushing system, comprising the above continuous sand flushing structure, a plurality of continuous sand flushing structures are arranged side by side, and a plurality of sand flushing sections are connected to each other.

[0019] Beneficial effects: the application is provided with a plurality of independent continuous sand flushing structures, the pool boxes can be independently operated and managed, and the economic loss caused by shutdown and maintenance can be reduced when the sand flushing branch corridor is blocked or fails.

[0020] In an alternative embodiment, the continuous flushing system further comprises a traffic corridor connecting the plurality of downstream connecting sections.

[0021] Beneficial effects: The present application sets up a traffic corridor connecting a plurality of downstream connecting sections, which facilitates the work personnel to go back and forth between the continuous flushing structures to perform maintenance and other work on the equipment.

[0022] In a third aspect, the present application further provides a continuous flushing method using the continuous flushing system described above, which comprises:

[0023] sequentially opening the third gate and the fourth gate of the water inlet section to make the water flow sequentially through the upstream connecting section and the rectifier section and then enter the working section;

[0024] opening the fifth gate of the downstream connecting section to guide the upper clear water to the water conveying tunnel;

[0025] opening the first gate and the second gate to make the lower water flow carrying the sediment flow from the flushing main corridor into the sediment discharge section through the first flushing branch corridor and the second flushing branch corridor;

[0026] judging whether the first flushing branch corridor or the second flushing branch corridor is blocked or needs to be maintained, closing the corresponding first gate or second gate, and keeping the second flushing branch corridor or the first flushing branch corridor to continuously flush. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 FIG. 1 is a plan view of a continuous sediment discharge system according to an embodiment of the present application;

[0029] Figure 2 FIG. 2 is a longitudinal section view of A-A in FIG. 1; Figure 1

[0030] Figure 3 FIG. 3 is a transverse section view of B-B in FIG. 1; Figure 1

[0031] Figure 4 FIG. 4 is an enlarged view of A in FIG. 1; Figure 1

[0032] Figure 5 FIG. 5 is an enlarged view of B in FIG. 1. Figure 2

[0033] Legend of reference signs:​​​​

[0034] 100. Continuous sand flushing structure;

[0035] 1. Pool / box;

[0036] 2. Inlet section;

[0037] 3. Upstream connecting section;

[0038] 4. Working section;

[0039] 5. Downstream connecting section;

[0040] 6. Sand removal section;

[0041] 7. Main sand-dredging corridor;

[0042] 8. First sand-rushing branch corridor;

[0043] 9. Second sand-dredging branch corridor;

[0044] 11. First gate;

[0045] 12. Second gate;

[0046] 13. Cover plate;

[0047] 14. Waterway;

[0048] 15. Rectifier section;

[0049] 16. Third gate;

[0050] 17. Fourth gate;

[0051] 18. Fifth gate;

[0052] 19. Water conveyance tunnel;

[0053] 20. Transportation corridors;

[0054] 21. Sand discharge hole. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0057] According to an embodiment of the present invention, in one aspect, such asFigures 1 to 5 As shown, a continuous sand flushing structure 100 is provided, comprising a pool box 1, a sand flushing main corridor 7, a first sand flushing branch corridor 8, a second sand flushing branch corridor 9, a first gate 11 and a second gate 12, the pool box 1 comprises a water inlet section 2, an upstream connecting section 3, a working section 4, a downstream connecting section 5 and a sand discharge section 6 arranged in sequence along the water flow direction, the sand flushing main corridor 7 is arranged at the bottom of the pool box 1, extends from the upstream connecting section 3 to the working section 4, the first sand flushing branch corridor 8 is arranged at the bottom of the pool box 1, extends from the working section 4 to the sand discharge section 6, the second sand flushing branch corridor 9 is arranged at the bottom of the pool box 1, is arranged in parallel with the first sand flushing branch corridor 8, and extends from the working section 4 to the sand discharge section 6, the first gate 11 is arranged in the first sand flushing branch corridor 8, and the second gate 12 is arranged in the second sand flushing branch corridor 9.

[0058] Specifically, in the embodiment, the pool box 1 is in a linear structure and is arranged below the ground, the water inlet section 2 is adapted to be connected with a water source, the water flow in the water source enters the pool box 1 through the water inlet of the water inlet section 2, the cross-sectional size of the water inlet section 2 is smaller than that of the working section 4, the upstream connecting section 3 is in a gradual change structure, the internal cross-sectional size gradually increases from the water inlet to the working section 4 to diffuse the water flow, and the upstream connecting section 3 can optimize the water flow condition to avoid severe changes of the water flow when the cross section is converted, such as vortex and other adverse flow phenomena. Through the transition effect of the upstream connecting section 3, the water flow can be more smoothly transferred from the water inlet section 2 to the working section 4, and the water head loss and cavitation damage caused by sudden change of flow rate are reduced.

[0059] In the embodiment, the sand flushing main corridor 7 is arranged at the bottom of the pool box 1, extends from the end of the upstream connecting section 3 to the end of the working section 4, and branches into the first sand flushing branch corridor 8 and the second sand flushing branch corridor 9 at the end of the working section 4, the first sand flushing branch corridor 8 and the second sand flushing branch corridor 9 extend from the end of the working section 4 to the sand discharge section 6, when the water flow passes through the pool box 1, the upper layer of the water flow with a faster flow rate is transported to the water using equipment through the upstream connecting section 3, the working section 4 and the downstream connecting section 5, and the lower layer of the water flow containing silt particles with a smaller flow rate flows into the sand flushing main corridor 7 at the bottom of the pool box 1, is branched into the first sand flushing branch corridor 8 and the second sand flushing branch corridor 9 along the sand flushing main corridor 7, and finally flows into the sand discharge section 6 to be discharged into the nearby river.

[0060] In the embodiment, the first gate 11 and the second gate 12 are arranged in the first sand flushing branch corridor 8 and the second sand flushing branch corridor 9 in the downstream connecting section 5, respectively.

[0061] The first sand flushing branch channel 8 and the second sand flushing branch channel 9 are arranged, and the first gate 11 and the second gate 12 are arranged in the first sand flushing branch channel 8 and the second sand flushing branch channel 9 respectively, if the first sand flushing branch channel 8 is blocked or needs to be maintained, the first gate 11 can be closed, and the second gate 12 on the second sand flushing branch channel 9 is kept open, if the second sand flushing branch channel 9 is blocked or needs to be maintained, the second gate 12 can be closed, and the first gate 11 on the first sand flushing branch channel 8 is kept open, the first gate 11 and the second gate 12 are standby gates, when one of the sand flushing branch channels is blocked or needs to be maintained, the power station can still work continuously, and the advantages are simple structure, convenient operation, flexible sand flushing, small influence on subsequent processes and the like.

[0062] In one embodiment, as shown in FIG. 1, a cover plate 13 is arranged in the pool box 1, the cover plate 13 divides the pool box 1 into a water passing channel 14 and a sand flushing main channel 7, the sand flushing main channel 7 is below the cover plate 13, and a plurality of sand setting holes are arranged on the cover plate 13. Figure 3

[0063] Specifically, in the embodiment, the cover plate 13 extends from the inlet end of the upstream connecting section 3 to the end of the working section 4, the cover plate 13 divides the pool box 1 into the water passing channel 14 above and the sand flushing main channel 7 below, and the cover plate 13 is not limited in the embodiment, and in the embodiment, the cover plate 13 can be a grating plate, and the grating holes on the grating plate can be used as the sand setting holes.

[0064] The cover plate 13 is arranged, when the horizontal flow velocity of the sand particles in the water flow is less than the vertical flow velocity, the sand particles are deposited downward, and the sand particles can enter the sand flushing channel through the sand setting holes on the cover plate 13, and the clean water with high flow velocity in the water flow flows to the water using equipment through the water passing channel 14, and the advantages are simple structure, good sand setting effect and high water cleanliness.

[0065] In one embodiment, as shown in FIG. 1, the pool box 1 is a straight wall and dome lining structure. Figure 3

[0066] Specifically, in the embodiment, the pool box 1 is an underground excavated tunnel, the inner wall of the tunnel is a vertical wall lining structure, and the top of the tunnel is a circular arch lining structure.

[0067] The straight wall and dome lining structure has the advantages of small land occupation, no occupation of river channel, small influence of topography and foundation surface geology, large drainage capacity, good anti-seismic performance, high bearing capacity and low construction difficulty, and the construction and building cost is reduced.

[0068] In one embodiment, as shown in FIG. 1, the bottom of the water passing channel 14 is a slope. Figure 3 In one embodiment, as shown in FIG. 1, the bottom of the water passing channel 14 is a slope.​​

[0069] Specifically, in the embodiment, the bottom of the water passage 14 is connected to the cover plate 13 through two inclined surfaces on both sides, and the included angle between the two inclined surfaces is greater than twice the internal friction angle of the sediment particles on the inclined surface, so that the sediment can flow along the pool wall into the opening of the cover plate 13 and sink into the main flushing channel 7. In the embodiment, the included angle is set to 106° to meet the actual situation. The main flushing channel 7 is recessed below the cover plate 13, and the top of the main flushing channel 7 is an opening, and the cover plate 13 is arranged at the opening. The bottom of the water passage 14 is connected to the two sides of the opening of the main flushing channel 7 through the inclined surfaces.

[0070] The bottom of the water passage 14 is provided with an inclined surface, which facilitates the downward flow of sediment particles in the water flow into the flushing channel, and avoids the deposition of sediment in the water passage 14.

[0071] In one embodiment, as shown in Figure 1 and Figure 2 , the continuous flushing structure 100 further comprises a flow regulating section 15 connected to the upstream connecting section 3 and the working section 4.

[0072] Specifically, in the embodiment, the water passage 14 of the flow regulating section 15 is provided with a flow regulating grid, and a plurality of grid holes are arranged on the flow regulating grid. The water flow is smoothly introduced into the working section 4 after being regulated through the grid holes.

[0073] The present application can effectively reduce the rotational flow speed of the water flow by providing the flow regulating section 15, so as to slow down the water flow, thereby helping the sediment particles to settle at the bottom more easily and improving the effect of sediment discharge.

[0074] In one embodiment, as shown in Figure 1 , the water inlet section 2 is sequentially provided with a third gate 16 and a fourth gate 17 along the water flow direction.

[0075] Specifically, in the embodiment, the third gate 16 is a maintenance gate, and the fourth gate 17 is a working gate. The working gate functions as a water passage in the water inlet section 2, and is used to adjust the flow of the passage, bear the main work, and can be opened and closed in running water. The main function of the working gate is to adjust the water level between the upstream and downstream, discharge water, discharge sediment, etc. The maintenance gate is used to temporarily block water when the continuous flushing structure 100 or the working gate is maintained. The maintenance gate is arranged in front of the working gate and is used for short-term water blocking. The maintenance gate is usually opened and closed in still water. In addition, the maintenance gate can also be used as an emergency gate. It can also be closed in running water and opened in still water, which is used to cut off the water flow in emergency situations to prevent accidents from expanding.

[0076] In one embodiment, as shown in Figure 2 , Figure 4 and Figure 5 , the downstream connecting section 5 is provided with a fifth gate 18.

[0077] Specifically, the upper layer of the downstream connecting section 5 is provided with a water outlet and a fifth gate 18 in the embodiment. The water outlet is used to output water flow with clean water quality in the upper layer. The fifth gate 18 is provided with two gates, which are respectively located in the water outlet corridor 14 above the first sand flushing branch corridor 8 and the second sand flushing branch corridor 9. The middle layer of the downstream connecting section 5 is provided with a gate operating room for operating and controlling the first gate 11 and the second gate 12. The first gate 11 and the second gate 12 are arranged in the lower layer of the downstream connecting section 5. The lower layer is provided with a sand discharge hole 21 at the bottom, which is used to communicate with the sand discharge section 6.

[0078] In the embodiment, the first gate 11 and the second gate 12 are bidirectional sand discharge gates, and the fifth gate 18 is a bidirectional water blocking gate. The third gate 16 and the fourth gate 17 are unidirectional water blocking gates.

[0079] In one embodiment, as shown in Figure 1 The continuous sand flushing structure 100 further includes a water conveying tunnel 19 arranged at the end of the downstream connecting section 5.

[0080] Specifically, the upper layer of the downstream connecting section 5 is provided with a water outlet in the side wall of the water outlet corridor 14. The water outlet is connected with the water conveying tunnel 19. The clean water in the upper layer after desilting is provided to the water conservancy power generation through the water conveying tunnel 19, so as to ensure the normal operation of the power station.

[0081] In the embodiment, the water inlet section 2, the upstream connecting section 3, the flow regulating section 15, the working section 4, the downstream connecting section 5 and the water conveying tunnel 19 are arranged in the same straight line direction. The sand discharge section 6 is arranged at the side of the downstream connecting section 5.

[0082] According to the embodiment of the present application, on the other hand, as shown in Figure 1 A continuous sand flushing system is further provided, which includes the above-mentioned continuous sand flushing structure 100. A plurality of continuous sand flushing structures 100 are arranged side by side. A plurality of sand discharge sections 6 are connected with each other.

[0083] Specifically, the number of the continuous sand flushing structures 100 is not limited in the embodiment. In order to meet the actual situation, four continuous sand flushing structures 100 are arranged in the embodiment. The four continuous sand flushing structures 100 are arranged side by side in parallel. The sand discharge hole 21 is arranged at the side of the downstream connecting section 5 below each continuous sand flushing structure 100. The sand discharge section 6 is connected with the sand discharge hole 21. The sand discharge sections 6 in each continuous sand flushing structure 100 are connected with each other. In the embodiment, the sand discharge sections 6 in the four continuous sand flushing structures 100 are connected as a straight line section. The extension direction of the connected sand discharge sections 6 is perpendicular to the extension direction of the continuous sand flushing structure 100.

[0084] The present application can realize the independent operation and management of each pool box 1 by arranging a plurality of independent continuous sand flushing structures 100. The economic loss caused by shutdown for maintenance can be reduced when the sand flushing branch corridor is blocked or other faults occur.

[0085] In one embodiment, as shown in Figure 1 、 Figure 2 、 Figure 4 and Figure 5 , the continuous flushing system further comprises a traffic corridor 20 connecting the plurality of downstream connecting sections 5.

[0086] Specifically, in the embodiment, the traffic corridor 20 is arranged on the top of the downstream connecting section 5, and the traffic corridors 20 in the four continuous flushing structures 100 are communicated with each other.

[0087] The present application sets the traffic corridor 20 connecting the plurality of downstream connecting sections 5, which facilitates the staff to go back and forth between the continuous flushing structures 100 for maintenance and other work.

[0088] According to the embodiment of the present application, in a further aspect, a continuous flushing method is also provided, which uses the above continuous flushing system, and the flushing method comprises:

[0089] S1: sequentially opening the third gate 16 and the fourth gate 17 of the water inlet section 2, so that the water flow sequentially passes through the upstream connecting section 3 and the flow regulating section 15 and then enters the working section 4;

[0090] S2: opening the fifth gate 18 of the downstream connecting section 5 to guide the upper clear water to the water conveying tunnel 19;

[0091] S3: opening the first gate 11 and the second gate 12 to guide the lower water flow carrying the sediment from the flushing main corridor 7 to the sediment discharging section 6 through the first flushing branch corridor 8 and the second flushing branch corridor 9;

[0092] S4: judging whether the first flushing branch corridor 8 or the second flushing branch corridor 9 is blocked or needs to be maintained, and closing the corresponding first gate 11 or the second gate 12 to maintain the continuous flushing of the second flushing branch corridor 9 or the first flushing branch corridor 8.

[0093] Specifically, in the embodiment, each continuous flushing structure 100 operates independently, and all the gates are initially closed, and the flushing steps are as follows:

[0094] S1: sequentially opening the third gate 16 and the fourth gate 17 of the water inlet section 2, so that the water flow smoothly transitions from the upstream connecting section 3 to the working section 4, and then smoothly enters the working section 4 after being regulated by the flow regulating section 15;

[0095] S2: the water flow slows down in the working section 4, and when the horizontal flow velocity of the sediment particles in the water flow is less than the vertical flow velocity, the sediment particles are deposited downward and enter the flushing main corridor 7 through the sedimentation holes in the cover plate 13;

[0096] S3: opening the fifth gate 18 of the downstream connecting section 5 to guide the upper clear water in the pool box 1 to enter the water conveying tunnel 19;

[0097] S4: opening the first gate 11 and the second gate 12, so that the lower layer carrying sediment flow is discharged into the nearby river channel after being converged by the sand flushing main corridor 7 into the sand flushing branch corridor 8 and the sand flushing branch corridor 9 and then into the sand discharge hole 21;

[0098] S5: judging whether the first sand flushing branch corridor 8 or the second sand flushing branch corridor 9 is blocked or needs to be maintained, if the first sand flushing branch corridor 8 is blocked or needs to be maintained, the first gate 11 is closed, the second gate 12 on the second sand flushing branch corridor 9 is kept open, and the first sand flushing branch corridor 8 is maintained, if the second sand flushing branch corridor 9 is blocked or needs to be maintained, the second gate 12 is closed, the first gate 11 on the first sand flushing branch corridor 8 is kept open, and the second sand flushing branch corridor 9 is maintained, the first gate 11 and the second gate 12 are standby gates for each other.

[0099] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A continuous sand flushing structure, characterized in that, include: The pool (1) includes an inlet section (2), an upstream connecting section (3), a working section (4), a downstream connecting section (5), and a sand discharge section (6) arranged sequentially along the water flow direction; The main flushing channel (7) is located at the bottom of the pool tank (1) and extends from the upstream connecting section (3) to the working section (4); The first sand flushing branch corridor (8) is located at the bottom of the pool tank (1) and extends from the working section (4) to the sand discharge section (6); The second sand flushing branch corridor (9) is located at the bottom of the pool tank (1), parallel to the first sand flushing branch corridor (8), and extends from the working section (4) to the sand discharge section (6); The first gate (11) is located in the first sand flushing branch corridor (8); The second gate (12) is installed in the second sand flushing branch corridor (9). When the first sand flushing branch corridor (8) or the second sand flushing branch corridor (9) is blocked or needs maintenance, the corresponding first gate (11) or second gate (12) is closed to keep the second sand flushing branch corridor (9) or the first sand flushing branch corridor (8) continuously flushing sand.

2. The continuous sand flushing structure according to claim 1, characterized in that, The pool (1) is provided with a cover plate (13), which divides the pool (1) into a water passage (14) and a sand flushing main passage (7). The sand flushing main passage (7) is located below the cover plate (13), and the cover plate (13) is provided with multiple sand settling holes.

3. The continuous sand flushing structure according to claim 2, characterized in that, The pool (1) is a straight-walled arched lining structure.

4. The continuous sand flushing structure according to claim 2, characterized in that, The bottom of the water passage (14) is a slope.

5. The continuous sand flushing structure according to claim 1, characterized in that, Also includes: The rectifier section (15) connects the upstream connection section (3) and the working section (4).

6. The continuous sand flushing structure according to claim 1, characterized in that, The water intake section (2) is provided with a third gate (16) and a fourth gate (17) in sequence along the water flow direction.

7. The continuous sand flushing structure according to claim 1, characterized in that, The downstream connecting section (5) is equipped with a fifth gate (18).

8. The continuous sand flushing structure according to claim 1, characterized in that, Also includes: Water conveyance tunnel (19) is located at the end of the downstream connecting section (5).

9. A continuous sand flushing system, characterized in that, include: The continuous sand flushing structure (100) according to any one of claims 1 to 8, wherein a plurality of the continuous sand flushing structures (100) are arranged in parallel and the plurality of sand discharge sections (6) are interconnected.

10. The continuous sand flushing system according to claim 9, characterized in that, Also includes: Traffic corridor (20) connects multiple downstream connecting sections (5).

11. A continuous sand flushing method, characterized in that, Using the continuous sand flushing system as described in claim 9 or 10, the sand flushing method includes: The third gate (16) and the fourth gate (17) of the water intake section (2) are opened in sequence, so that the water flows through the upstream connecting section (3) and the rectification section (15) in sequence before entering the working section (4); Open the fifth gate (18) of the downstream connecting section (5) to divert the upper layer of clear water to the water conveyance tunnel (19); Open the first gate (11) and the second gate (12) to allow the sediment-laden water flow from the lower layer to flow from the main flushing corridor (7) through the first flushing branch corridor (8) and the second flushing branch corridor (9) into the sand discharge section (6); Determine whether the first sand flushing branch corridor (8) or the second sand flushing branch corridor (9) is blocked or needs maintenance, close the corresponding first gate (11) or second gate (12), and keep the second sand flushing branch corridor (9) or the first sand flushing branch corridor (8) continuously flushing sand.

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