Dredging and desilting device

Abstract

The invention discloses a desilting and desilting device, and relates to the technical field of desilting and desilting of hydraulic engineering, the desilting and desilting device comprises a sill, a stirring mechanism, a desilting channel, a primary desilting basin, a water delivery channel, a secondary desilting basin and a pressure water pipe, the sill is arranged at the bottom of a forebay and is close to a first water outlet of the forebay, and the stirring mechanism is arranged in front of the sill; a communicating port is formed in the side part of the side wall of the forebay between the sill and the stirring mechanism, one end of the desilting channel is communicated with the communicating port, and the other end of the desilting channel is communicated with the primary desilting basin; a second water outlet is formed in the top of the side wall of the first-stage desilting basin, the second water outlet is communicated with a second-stage desilting basin through a water conveying channel, the water conveying channel is arranged along an arc-shaped track, a third water outlet is formed in the top of the side wall of the second-stage desilting basin, and the third water outlet and the first water outlet are both communicated with a pressure water pipe. Sediment at the bottom of the forebay can be discharged into the first-stage desilting basin along with water flow, rapid desilting of a reservoir is completed, concentrated cleaning of the silt is facilitated, the desilting difficulty is reduced, and the desilting and desilting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of silt removal and sand discharge in water conservancy projects, and in particular to a silt removal and sand discharge device. Background Art

[0002] Many rivers have high sand content and large sand transport capacity. The problem of siltation in front of the reservoir dam is an inevitable challenge faced by reservoir construction. After the river water enters the reservoir, the water flow slows down, and the silt carried by the upstream water will settle to the bottom, clogging the reservoir capacity and shortening the service life of the reservoir. Therefore, the silt accumulated at the bottom must be cleaned regularly. However, the forebay in front of the reservoir dam is large, the silt is dispersed, and the aggregation is poor, which makes cleaning difficult and the cleaning efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to provide a silt removal and sand discharge device to solve the above-mentioned problems existing in the prior art. By arranging a stirring mechanism, a bottom sill and a sand discharge channel, the silt at the bottom of the front pool can be discharged into the primary sedimentation tank with the water flow, thereby completing the rapid dredging of the reservoir, and facilitating the centralized cleaning of silt, reducing the difficulty of dredging and improving the efficiency of sand removal and silt removal.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A silt removal and sand discharge device of the present invention is used in water conservancy projects. The silt removal and sand discharge device comprises a bottom sill, a stirring mechanism, a sand discharge channel, a primary sand settling tank, a water delivery channel, a secondary sand settling tank and a pressure water pipe. The bottom sill is arranged at the bottom of the front pool and close to the first water outlet of the front pool to block silt; along the water flow direction, a plurality of stirring mechanisms for stirring silt are arranged in front of the bottom sill; a connecting port is arranged on the side of the side wall of the front pool between the bottom sill and the stirring mechanism, the bottom end of the connecting port is flush with the bottom plate of the front pool, and the rear side edge of the connecting port is flush with the front end of the bottom sill, and one end of the sand discharge channel is connected to the connecting port. One end is connected with the outlet, and the other end is connected with the primary sedimentation tank, and the bottom surface of the sediment discharge channel is inclined downward along the water flow direction, and the silt is naturally flowed into the primary sedimentation tank with the water flow by gravity; the stirring mechanism stirs the silt to make the silt be lifted up and mixed into the water flow, and under the interception effect of the bottom sill, the silt intercepted in front of the bottom sill flows into the sediment discharge channel with the water flow, and then flows into the primary sedimentation tank for sedimentation; a second water outlet is provided on the top of the side wall of the primary sedimentation tank, and the second water outlet is connected with the secondary sedimentation tank through the water transfer channel, and a third water outlet is provided on the top of the side wall of the secondary sedimentation tank, and the third water outlet and the first water outlet are both connected with the pressure water pipe.

[0006] Furthermore, the stirring mechanism includes a fixed seat and a rotating wheel. The fixed seat is fixed to the bottom of the front pool. The rotating wheel and a motor for driving the rotating wheel to rotate are arranged on the fixed seat.

[0007] Furthermore, the impeller is tiltedly arranged at the bottom of the front pool, and the angle between the rotation direction of the impeller blades located below the rotating shaft and the water flow direction is less than 90°.

[0008] Furthermore, the water delivery channel is arranged along an arc track.

[0009] Furthermore, the cross section of the sand drainage channel is U-shaped.

[0010] Furthermore, a valve is provided at the water inlet of the primary sedimentation tank.

[0011] Furthermore, the primary sedimentation tank, the water channel and the secondary sedimentation tank all use underwater sludge suction to clean the silt.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are:

[0013] The silt removal and sand discharge device of the present invention can lift up the silt at the bottom of the reservoir by arranging a stirring mechanism at the bottom of the front pool, so that the silt is fully mixed in the water, and a bottom sill is provided behind the stirring mechanism to block the silt, so as to reduce the overflow of silt at the first water outlet, so that the water flow carrying the silt after stirring is discharged from the silt discharge channel into the primary sedimentation tank, thereby completing the rapid silt removal of the reservoir with significant silt removal effect; and, by intercepting and gathering the silt in the water at the bottom of the primary sedimentation tank, it is convenient to centrally clean the silt, reduce the difficulty of dredging, and improve the silt removal and sand discharge efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the silt removal and sand discharge device of the present invention;

[0016] Figure 2 It is a partial planar structural schematic diagram of the silt removal and sand discharge device of the present invention;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of a sand discharge channel in the silt removal and sand discharge device of the present invention;

[0018] Figure 4It is a structural schematic diagram of the stirring mechanism in the silt removal and sand discharge device of the present invention.

[0019] Explanation of the reference numerals: 1. front pool; 2. bottom sill; 3. sediment discharge channel; 4. primary sedimentation tank; 5. valve; 6. fixed seat; 7. impeller; 8. water supply channel; 9. secondary sedimentation tank; 10. pressure water pipe. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "length", "width", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 4As shown, the silt removal and sand removal device of this embodiment is applied to the forebay 1 of the water conservancy project, which includes a bottom bank 2, a sand discharge channel 3 and a primary sedimentation tank 4. The bottom bank 2 is arranged at the bottom of the forebay 1, close to the first water outlet of the forebay 1, and the bottom bank 2 has a certain height, which can block the silt in front of it. Along the direction of water flow, a stirring mechanism for stirring silt is arranged in front of the bottom bank 2. The front position referred to in this embodiment is the position where the water flows first. One end of the sand discharge channel 3 is connected to the bottom of the side wall of the forebay 1, and the connecting port is located between the bottom bank 2 and the stirring mechanism. The other end of the sand discharge channel 3 is connected to the primary sedimentation tank 4.

[0025] After water flows into the fore pool 1, most of the silt is deposited at the bottom of the fore pool 1, in front of the bottom bank 2, and a small amount of silt is discharged from the first water outlet with the water flow, and this part of the silt is not considered. When the silt at the bottom of the fore pool 1 is large and needs to be cleaned, the stirring mechanism is turned on, and the passage between the sand discharge channel 3 and the primary sedimentation tank 4 is connected, and the stirring mechanism is started to stir the silt, so that the silt is lifted and mixed into the water flow. Under the interception effect of the bottom bank 2, most of the silt mixed in the water flow is intercepted in front of the bottom bank 2, and a small amount is discharged from the first water outlet with the water flow, while the silt intercepted in front of the bottom bank 2 flows into the sand discharge channel 3 with the water flow, and further flows into the primary sedimentation tank 4, and the silt in the water flow is deposited in the primary sedimentation tank 4. When the silt deposited in the primary sedimentation tank 4 reaches the cleaning standard, the valve 5 is closed, the passage between the sand discharge channel 3 and the primary sedimentation tank 4 is cut off, and the silt is cleaned by underwater sludge suction. Underwater sludge suction is specifically done by operators sinking a dredging boat or pump pipe tool to the bottom of the sedimentation area to suck up the silt, and then transporting the silt to the shore for treatment through pipes. The siltation pool can also be drained and cleaned manually. This cleaning method is simple and direct and can effectively excavate silt.

[0026] In this embodiment, a stirring mechanism is arranged at the bottom of the front pool 1, so that the silt at the bottom of the reservoir can be lifted up and fully mixed with the water. A bottom sill 2 is arranged behind the stirring mechanism to block the silt, so as to reduce the overflow of silt at the first water outlet, so that the water flow carrying the silt after stirring is discharged from the sediment discharge channel 3 into the primary sedimentation tank 4, thereby completing the rapid dredging of the reservoir with significant dredging effect; and, by intercepting and gathering the silt in the water at the bottom of the primary sedimentation tank 4, it is convenient to centrally clean the silt, reduce the difficulty of dredging, and improve the efficiency of dredging.

[0027] At the same time, a valve 5 is provided at the water inlet of the primary sedimentation tank 4, and the valve 5 is closed when the forebay 1 needs to be desilted.

[0028] like Figure 4As shown, in this embodiment, the stirring mechanism includes a fixed seat 6 and a runner 7, the fixed seat 6 is fixed at the bottom of the forebay 1, and the fixed seat 6 is provided with a runner 7 and a motor for driving the runner 7 to rotate. Several stirring mechanisms can be provided at the bottom of the forebay 1, which play a stirring role on the silt in each part of the bottom of the forebay 1. Preferably, the runner 7 is tilted and arranged at the bottom of the forebay 1, and the angle between the rotation direction of the runner 7 blades located below the rotating shaft and the water flow direction is less than 90°, which can lift the silt and mix the silt into the water flow. The bottom sill 2 needs to have a certain height to intercept the raised silt, ensuring that most of the silt flows into the primary sedimentation tank 4 from the sediment discharge channel 3 with the water flow, and only the upper clear water is discharged from the first outlet of the forebay 1. The specific height of the bottom sill 2 can be comprehensively designed according to the size of the runner 7 and the height at which the silt can be lifted.

[0029] In order to facilitate the discharge of sediment from the sediment discharge channel 3 by water flow, the bottom end of the connecting port on the side wall of the front pool 1 in this embodiment is flush with the bottom plate of the front pool 1, and the rear edge of the connecting port is flush with the front end of the bottom sill 2, so that the water flow can flow into the sediment discharge channel 3 along the front side of the bottom sill 2, avoiding the accumulation of sediment at the front end of the bottom sill 2.

[0030] Moreover, in the present embodiment, the bottom surface of the sand discharge channel 3 is inclined downward along the direction of water flow, so as to facilitate the water flow from the sand discharge channel 3 into the primary sand settling tank 4. At the same time, it also ensures that the water flow has a certain flow velocity in the sand discharge channel 3, which has a scouring effect on the bottom surface of the sand discharge channel 3 and avoids excessive sedimentation in the sand discharge channel 3.

[0031] Under normal circumstances, after the water in the primary sedimentation tank 4 has been sedimented, it needs to flow into the pressure water pipe 10 for subsequent use. In order to improve the sedimentation effect, a second water outlet is provided at the top of the side wall of the primary sedimentation tank 4, and the second water outlet is connected to the secondary sedimentation tank 9 through the water delivery channel 8. A third water outlet is provided at the top of the side wall of the secondary sedimentation tank 9, and the third water outlet and the first water outlet are both connected to the pressure water pipe 10.

[0032] As a preferred structural form of the water delivery channel 8, the water delivery channel 8 is arranged along an arc track in this embodiment. After the sedimentation in the primary sedimentation tank 4, a large amount of silt is deposited in the primary sedimentation tank 4, and the upper layer of clean water flows into the water delivery channel 8 from the second water outlet. Since the water delivery channel 8 is arc-shaped, it has a deceleration effect on the water flow, so that the silt mixed in the water flow is easy to partially settle in the water delivery channel 8. After the water flow flows into the secondary sedimentation tank 9, the silt mixed in the water flow settles again in the secondary sedimentation tank 9, and the upper layer of clean water flows into the pressure water pipe 10 from the third water outlet.

[0033] Therefore, this embodiment can further improve the sedimentation effect and reduce the risk of the pressure water pipe 10 being blocked by sediment by providing the arc-shaped water delivery channel 8 and the secondary sedimentation tank 9. When the sediment deposited at the bottom of the water delivery channel 8 and the secondary sedimentation tank 9 reaches a certain amount, it needs to be cleaned, and the cleaning method is the same as the cleaning method of the primary sedimentation tank 4.

[0034] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A silt removal and sand removal device, characterized in that: The desilting and sand removal device is used in water conservancy projects. The desilting and sand removal device includes a bottom sill, a stirring mechanism, a sand removal channel, a primary sand settling tank, a water delivery channel, a secondary sand settling tank and a pressure water pipe. The bottom sill is arranged at the bottom of the forebay and close to the first water outlet of the forebay to block the silt; along the water flow direction, a plurality of stirring mechanisms for stirring the silt are arranged in front of the bottom sill; A communication port is provided on the side of the side wall of the front pool between the bottom sill and the stirring mechanism, the bottom end of the communication port is flush with the bottom plate of the front pool, and the rear edge of the communication port is flush with the front end of the bottom sill, one end of the sand discharge channel is connected with the communication port, and the other end is connected with the primary sedimentation tank, and the bottom surface of the sand discharge channel is inclined downward along the water flow direction, and the sediment is naturally flowed into the primary sedimentation tank with the water flow by gravity; The stirring mechanism stirs the silt to lift it up and mix it into the water flow. Under the intercepting effect of the bottom sill, the silt intercepted in front of the bottom sill flows into the sediment discharge channel with the water flow, and then flows into the primary sedimentation tank for sedimentation. A second water outlet is provided at the top of the side wall of the primary sedimentation tank, and the second water outlet is connected to the secondary sedimentation tank through the water supply channel. A third water outlet is provided at the top of the side wall of the secondary sedimentation tank, and the third water outlet and the first water outlet are both connected to the pressure water pipe.

2. The silt removal and sand removal device according to claim 1, characterized in that: The stirring mechanism comprises a fixed seat and a rotating wheel. The fixed seat is fixed to the bottom of the front pool. The rotating wheel and a motor for driving the rotating wheel to rotate are arranged on the fixed seat.

3. The silt removal and sand removal device according to claim 2, characterized in that: The impeller is tiltedly arranged at the bottom of the front pool, and the angle between the rotation direction of the impeller blades located below the rotating shaft and the water flow direction is less than 90°.

4. The silt removal and sand removal device according to claim 1, characterized in that: The water delivery channel is arranged along an arc track.

5. The silt removal and sand removal device according to claim 1, characterized in that: The cross section of the sediment discharge channel is U-shaped.

6. The silt removal and sand removal device according to claim 1, characterized in that: A valve is provided at the water inlet of the primary sedimentation tank.

7. The silt removal and sand removal device according to any one of claims 1 to 6, characterized in that: The primary sedimentation tank, the water delivery channel and the secondary sedimentation tank all use underwater sludge suction to clean the silt.

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