A collaborative structure for preventing siltation and flushing at the bottom of an open channel water intake well

Abstract

This utility model relates to a reservoir intake well applicable to water conservancy and hydropower projects, specifically a combined anti-siltation and scouring structure for the bottom of an open channel intake well. The aim is to provide a combined anti-siltation and scouring structure for the bottom of an open channel intake well, which should be simple in structure, have high sludge removal efficiency, reliable operation, and convenient maintenance. The technical solution is a combined anti-siltation and scouring structure for the bottom of an open channel intake well, including an intake shaft equipped with a pumping pipeline and an open intake channel connecting the reservoir and the intake shaft; characterized in that: the intake shaft is equipped with a scouring pipeline connecting to the pumping pipeline; the top of both sides of the open intake channel are equipped with slag barriers to block external sand and soil; the open intake channel is equipped with a debris-blocking net to intercept floating debris; and the bottom of the open intake channel has a reverse slope.

Description

Technical Field

[0001] This utility model relates to a reservoir water intake well applicable to water conservancy and hydropower projects, specifically a bottom anti-siltation and scouring collaborative structure for open channel water intake wells. Background Technology

[0002] In water intake projects of water conservancy and hydropower engineering, open channels or diversion channels are often used to draw water from reservoirs, and intake wells are installed accordingly. Intake pipes and pumps are then installed at the bottom of these wells. Because the water flow velocity in open channel intake wells is relatively low, suspended solids such as silt and particles carried in the raw water naturally settle and gradually form a silt layer at the bottom of the channel, causing a drop in the effective water level of the intake well. Over long-term operation, the silt in the intake well can lead to problems such as intake blockage, pump wear and tear, and deterioration of the effluent water quality, threatening water supply security.

[0003] Once silt accumulates in open channel water intake wells, it is difficult for the silt to be naturally removed. Therefore, dredging the water intake wells is crucial for improving water intake safety. Manual dredging is inefficient, increases maintenance costs, and can significantly impact normal water intake. Mechanical dredging is suitable for large volumes of coarse silt, but the equipment is bulky and cannot be used in closed intake wells.

[0004] Therefore, it is of great significance to design a collaborative structure for preventing siltation and flushing at the bottom of open channel water intake wells to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings in the above-mentioned background technology and provide a collaborative structure for preventing siltation and flushing at the bottom of an open channel water intake well. This structure should have the characteristics of simple structure, high sludge discharge efficiency, reliable operation and convenient maintenance.

[0006] The technical solution of this utility model is:

[0007] A combined anti-siltation and flushing structure for the bottom of an open channel water intake well includes a water intake shaft equipped with a water pumping pipeline and an open intake channel connecting a reservoir and the water intake shaft; characterized in that: the water intake shaft is equipped with a flushing pipeline connected to the water pumping pipeline; the top of the two side walls of the open intake channel are equipped with slag barriers to block external sand and soil; the open intake channel is equipped with a debris-blocking net to intercept floating objects; and the bottom of the open intake channel has a reverse slope.

[0008] The slope of the water intake channel is 8-12%; the bottom of the water intake channel is connected to the bottom of the water intake shaft with the same slope.

[0009] The bottom and inner wall of the water intake channel are equipped with several hooks, and the debris net is suspended on the hooks.

[0010] The cross-section of the slag trap is a right-angled trapezoid; the height of the slag trap is 300-600mm, and the top width of the slag trap is 300-500mm.

[0011] The water supply pipeline includes a water supply pipe extending downward from the top of the water intake shaft to the bottom, and a water intake pump installed at the bottom of the water supply pipe.

[0012] The flushing pipeline includes a main flushing pipe, a branch flushing pipe, and a flushing spray pipe connected in sequence.

[0013] The main flushing pipe is buried in the wall of the water intake shaft and extends downward from the top of the water intake shaft to the bottom; the branch flushing pipe is buried in the wall of the water intake shaft and is divided into three sections arranged on both sides of the water intake shaft and on the water supply side; the flushing nozzle is equidistantly arranged on each section of the branch flushing pipe and extends into the well cavity from the wall of the water intake shaft in an inclined downward direction.

[0014] The top ends of both the water pumping pipe and the silt flushing main pipe are connected to an external water supply pipe; the water supply pipe is equipped with a first control valve and a second control valve to control the water pumping and silt flushing.

[0015] The horizontal distance from the flushing nozzle extending out of the water intake shaft wall is 100-200mm; the vertical distance between the flushing nozzle and the bottom of the water intake shaft is 100mm-200mm; the diameter of the flushing nozzle is DN25; and the spacing between the flushing nozzles is 1000mm.

[0016] The beneficial effects of this utility model are:

[0017] This utility model's collaborative design combines passive silt prevention and active silt flushing, effectively solving the problem of siltation at the bottom of open channel intake wells in reservoir water intake projects. It reduces sediment buildup by installing a slag retainer at the top of the intake channel to prevent ground deposits from falling into the channel and forming sediment. A debris net at the intake channel inlet intercepts floating debris during the initial water storage phase and is removed after water storage is complete. A reverse slope at the bottom of the intake channel mitigates siltation at the bottom of the well and facilitates the removal of silt from the intake area during dredging. A flushing pipe installed in the intake well periodically removes silt from the bottom of the channel through hydraulic flushing, allowing the silt to be discharged via the reverse slope of the intake channel or by a water pump. Attached Figure Description

[0018] Figure 1 This is a top view of the structure of this utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0020] Figure 3 yes Figure 1A schematic diagram of the cross-sectional structure of section B.

[0021] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure of section C.

[0022] Figure label:

[0023] 1. Water intake shaft; 2. Water intake channel; 3. Sludge retaining sill; 4. Main flushing pipe; 5. Flushing branch pipe; 5.1 Flushing spray pipe; 6. Hook; 7. Pumping pipe; 8. Water intake pipe; 9. Water intake pump; 10. First control valve; 11. Second control valve. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 and Figure 2 As shown, a combined structure for preventing siltation and flushing at the bottom of an open channel water intake well includes a water intake shaft 1, an open water intake channel 2, a water pumping pipeline, a silt flushing pipeline, and a debris screen (omitted in the figure).

[0026] The water intake shaft is a closed intake shaft with a water intake pump room at its top. The water intake shaft is connected to the reservoir via an open intake channel, and water from the reservoir is introduced into the water intake shaft through the open intake channel. Figure 2 In the middle, the right side of the water intake channel connects to the reservoir and the left side connects to the bottom of the water intake shaft.

[0027] The bottom of the water intake channel has a reverse slope, such as Figure 2 As shown, reservoir water flows into the intake shaft from right to left, and the bottom of the channel gradually rises along the direction of water flow (left higher than right) to prevent silt from entering the bottom of the intake shaft. The slope of the reverse slope should be 8-12%.

[0028] The bottom of the water intake shaft is a slope connecting to the bottom of the canal. The bottom of the water intake canal and the bottom of the water intake shaft are connected at the same slope, which facilitates the flushing of mud and sand from the bottom of the shaft through the reverse slope during siltation.

[0029] The top of the side walls of the water intake channel are equipped with slag barriers 3. Because the slag barriers are higher than the ground, they can prevent sand and soil from entering the channel from both sides. Figure 3 As shown, the slag retainer is a right-angled trapezoid. The inner inclined surface of the slag retainer (the side facing the other side of the slag retainer) connects to the inner wall of the water intake channel below, and the inner inclined surface of the slag retainer has the same angle of inclination as the inner wall of the water intake channel. The height of the slag retainer is 300–600 mm, and the top width of the slag retainer is 300–500 mm.

[0030] The debris-blocking net is installed in the water intake channel to intercept floating debris and prevent it from entering the water intake shaft. The bottom and inner wall of the water intake channel are equipped with several hooks 6, which can be arranged at equal intervals. During the initial water storage phase, the debris-blocking net is suspended in the water intake channel via the hooks to intercept floating debris. After water storage is completed, the debris-blocking net is removed for easy maintenance.

[0031] The water supply pipeline includes a water supply pipe 7 and a water intake pump 9. The water supply pipe extends downward from the water intake pump house at the top of the water intake shaft to the bottom of the water intake shaft. The water intake pump is located at the bottom end of the water supply pipe.

[0032] The flushing pipeline includes a main flushing pipe 4, a branch flushing pipe 5, and a flushing spray pipe 5.1 connected in sequence. The main flushing pipe is vertically buried in the wall of the intake shaft, extending downwards from the intake pump house at the top of the intake shaft to the bottom. The branch flushing pipe is buried in the bottom wall of the intake shaft and is divided into three sections, which are respectively arranged around the three sides of the intake channel (arranged on both sides of the intake shaft and the water supply side). Figure 1 As shown, the first section of the flushing branch pipe is horizontally arranged and located on the water supply side (the side away from the water intake canal, close to the water supply direction of the water intake pump house). For example... Figure 1 and Figure 2 As shown, the first flushing branch pipe extends from both ends into the intake channel, forming two other flushing branch pipes. These two flushing branch pipes are arranged at an angle (parallel to the bottom of the intake channel). The main flushing pipe connects to one of the flushing branch pipes. Several flushing nozzles are vertically arranged on these three flushing branch pipes. The flushing nozzles on each flushing branch pipe are equidistant, and they extend from the wall of the intake shaft into the shaft cavity at a downward angle. During flushing, the water flow generated directly acts on the bottom of the shaft, using hydraulic flushing to remove the silt.

[0033] The horizontal distance from the flushing nozzle extending out of the water intake shaft wall is 100-200mm; the vertical distance between the flushing nozzle and the bottom of the water intake shaft is 100mm-200mm; the diameter of the flushing nozzle is DN25; and the spacing between the flushing nozzles is 1000mm.

[0034] The main flushing pipe and the water supply pipe are connected via water intake pipe 8. For example... Figure 2 As shown, the top of the flushing main pipe and the water supply pipe are connected through a water intake pipe. The water intake pipe is equipped with a first control valve 10, and the external water supply pipe connected to the water supply pipe is equipped with a second control valve 11.

[0035] The working principle of this utility model:

[0036] Normal water pumping: The first control valve is closed, the second control valve and the water intake pump are opened, and the water source in the water intake shaft is delivered to the water conservancy and hydropower project through the water supply pipeline;

[0037] Active flushing: The first control valve and the water intake pump are opened, the second valve is closed, and the water in the water intake shaft is sprayed out through the water lifting pipe, water supply pipe, main flushing pipe, branch flushing pipe and flushing nozzle to remove the silt.

[0038] Passive silt prevention: In the initial stage of water storage, a debris-blocking net is installed in the water intake channel to intercept floating objects in the water, and the reverse slope of the channel bottom can reduce siltation; the net is removed after water storage is completed; the surrounding mud and sand are blocked from entering the channel by the sludge-blocking embankments on both sides of the water intake channel.

[0039] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A silt and scour coordination structure at the bottom of an open channel water intake well, comprising a water intake shaft (1) provided with a water lifting pipeline and a water intake open channel (2) connecting a reservoir and the water intake shaft; characterized in that: The water intake shaft is equipped with a flushing pipe that connects to the water pumping pipeline; the top of the two sides of the water intake channel is equipped with a slag retainer (3) to block external sand and soil; the water intake channel is equipped with a debris net to intercept floating objects; the bottom of the water intake channel is a reverse slope.

2. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 1, characterized in that: The slope of the water intake channel is 8-12%; the bottom of the water intake channel is connected to the bottom of the water intake shaft with the same slope.

3. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 2, characterized in that: The bottom and inner wall of the water intake channel are provided with several hooks (6), and the debris net is suspended on the hooks.

4. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 3, characterized in that: The cross-section of the slag trap is a right-angled trapezoid; the height of the slag trap is 300-600mm, and the top width of the slag trap is 300-500mm.

5. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 4, characterized in that: The water supply pipeline includes a water supply pipe (7) extending from the top of the water intake shaft downwards to the bottom, and a water intake pump (9) installed at the bottom of the water supply pipe.

6. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 5, characterized in that: The flushing pipeline includes a main flushing pipe (4), a branch flushing pipe (5), and a flushing spray pipe (5.1) connected in sequence; the main flushing pipe is connected to the water supply pipe through a water intake pipe (8).

7. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 6, characterized in that: The main flushing pipe is buried in the wall of the water intake shaft and extends downward from the top of the water intake shaft to the bottom; the branch flushing pipe is buried in the wall of the water intake shaft and is divided into three sections arranged on both sides of the water intake shaft and on the water supply side; the flushing nozzle is equidistantly arranged on each section of the branch flushing pipe and extends into the well cavity from the wall of the water intake shaft in an inclined downward direction.

8. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 7, characterized in that: The top of the water supply pipe (7) and the top of the silt flushing main pipe are both connected to the external water supply pipe; the water intake pipe is equipped with a first control valve (10), and the external water supply pipe connected to the water supply pipe is equipped with a second control valve (11).

9. The anti-siltation and scouring synergistic structure at the bottom of an open channel water intake well according to claim 8, characterized in that: The horizontal distance from the flushing nozzle extending out of the water intake shaft wall is 100-200mm; the vertical distance between the flushing nozzle and the bottom of the water intake shaft is 100mm-200mm; the diameter of the flushing nozzle is DN25; and the spacing between the flushing nozzles is 1000mm.

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