Drainage and pressure reduction device for reservoir bottom anti-seepage panel of pumped storage power station

Abstract

The invention discloses a drainage and pressure reduction device for a reservoir bottom anti-seepage panel of a pumped storage power station in the technical field of water conservancy and hydropower engineering. The drainage and pressure reduction device comprises an anti-seepage panel, a drainage cushion layer, a pressure relief pipe and a cover plate. The anti-seepage panel is used for preventing seepage of a reservoir basin of a reservoir, the drainage cushion layer is arranged below the anti-seepage panel and used for collecting water below the anti-seepage panel, the pressure relief pipe is arranged on the anti-seepage panel in a penetrating mode, and the cover plate is movably connected with the top end of the pressure relief pipe. The cover plate can move between a covering position and an opening position relative to the pressure relief pipe under the pressure difference effect of water above and below the impermeable panel, the cover plate seals the top end opening of the pressure relief pipe at the covering position, and the cover plate opens the top end opening of the pressure relief pipe at the opening position. The anti-seepage panel can be prevented from being jacked and damaged by high-pressure water on the lower portion, meanwhile, due to the fact that high-pressure water below the anti-seepage panel flows into the reservoir, loss of the water amount of the reservoir can be reduced, and then loss of the generating capacity of the reservoir is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and in particular to a drainage and pressure reducing device for an anti-seepage panel at the bottom of a reservoir in a pumped storage power station. Background Art

[0002] A pumped-storage power station consists of an upper reservoir, a lower reservoir, a water transmission system, and a power plant. During periods of low grid load, excess power is used to pump water from the lower reservoir to the upper reservoir for storage. During peak load periods, water is released from the upper reservoir to the lower reservoir for power generation. When there is no or minimal natural runoff in either the upper or lower reservoir, water loss from leakage within the reservoir also translates to power loss. In these situations, the anti-seepage requirements for the reservoir basin are extremely stringent. Generally, anti-seepage panels are used on both the reservoir banks and the bottom, effectively creating a full-basin anti-seepage system.

[0003] During the operation period of a pumped-storage power station, the water level of the reservoir changes frequently. During power generation, the water level of the upper reservoir drops from the normal storage level to the dead water level. Due to the rapid drop in water level, if the water leaking from the lower part of the anti-seepage panel at the bottom of the reservoir does not have time to dissipate, the water pressure at the lower part of the anti-seepage panel will be greater than the water pressure at the upper part. That is, the anti-seepage panel will be supported by the reverse water pressure, and the anti-seepage panel at the bottom of the reservoir may become unstable and damaged.

[0004] To address these issues, a drainage pad and drainage gallery are typically installed beneath the anti-seepage panels at the reservoir bottom. The drainage pad collects seepage water and drains it promptly through the gallery. However, the design and construction of drainage galleries at the reservoir bottom are complex and require significant investment. Furthermore, draining the seepage water out of the reservoir also represents a loss to the reservoir's total water capacity. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station, so as to solve the technical problem that the water pressure at the bottom of the anti-seepage panel is greater than the water pressure at the top, causing damage to the anti-seepage panel at the bottom of the reservoir.

[0006] The technical solution adopted by the present invention is: a drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir, comprising:

[0007] An anti-seepage panel, which is used to prevent the basin of the reservoir from seeing through, and is provided with at least one mounting through hole;

[0008] The drainage pad is arranged below the anti-seepage panel and can collect water under the anti-seepage panel and flow it to below the installation through hole.

[0009] Pressure relief pipe, the pressure relief pipe is installed in the installation through hole;

[0010] The cover plate has a covering position capable of closing the top end opening of the pressure relief pipe and an open position capable of opening the top end opening of the pressure relief pipe. The cover plate is movably connected to the top end of the pressure relief pipe so that the cover plate can switch the top end of the pressure relief pipe between the covering position and the open position relative to the pressure relief pipe under the pressure difference between the water pressure above and below the anti-seepage panel.

[0011] Preferably, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped-storage power station also includes a guide rod, the guide rod having a guide portion extending in the up-down direction and a limiting portion connected to the top of the guide portion, the cross-sectional area of ​​the guide portion is smaller than the cross-sectional area of ​​the limiting portion, the bottom end of the guide portion is connected to the top of the pressure relief pipe, the cover plate is provided with a guide hole, and the guide portion is used to fit in the guide hole to guide the cover plate to move between the top of the pressure relief pipe and the limiting portion.

[0012] Preferably, a pressure-bearing plate is provided at the top end of the pressure relief pipe. The pressure-bearing plate is connected to the outer peripheral wall of the top end of the pressure relief pipe and extends along the circumference of the pressure relief pipe and is closed for one circle.

[0013] Preferably, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes an annular water-stopping pad, which is located between the pressure plate and the cover plate, and is fixedly connected to the pressure plate.

[0014] Preferably, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes a water-permeable protective cover with an opening facing downward, the water-permeable protective cover is connected to the anti-seepage panel to form a closed cavity, and the cover plate is accommodated in the closed cavity.

[0015] Preferably, the pressure relief pipe is provided with a water stop ring, which is connected to the outer peripheral wall of the middle part of the pressure relief pipe and buried in the anti-seepage panel.

[0016] Preferably, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes a permeable sheet, which is connected to and blocks the pipe opening at the bottom end of the pressure relief pipe, and is used to stop the granular gravel outside the pressure relief pipe.

[0017] Preferably, a mesh plate is provided between the pipe opening at the bottom end of the pressure relief pipe and the water-permeable sheet, and the mesh plate abuts against the water-permeable sheet.

[0018] Preferably, the mesh plate is fixedly connected to the pressure relief pipe, and in a plane perpendicular to the extension direction of the pressure relief pipe, the mesh plate has an annular area arranged on the outer periphery of the pressure relief pipe.

[0019] Preferably, the water-permeable sheet has an extension portion, which extends away from the pressure relief pipe and perpendicular to the extension direction of the pressure relief pipe, and protrudes from the edge of the mesh plate to connect with the anti-seepage panel.

[0020] Beneficial effects of the present invention:

[0021] The present invention adopts a pressure relief and water replenishment method. When the water level in the reservoir is high, the water pressure above the anti-seepage panel is greater than the water pressure below the anti-seepage panel. At this time, the cover plate closes the top opening of the pressure relief pipe under the action of the water pressure difference, and can stop the water above the anti-seepage panel from flowing to the bottom of the anti-seepage panel, thereby ensuring the good anti-seepage performance of the reservoir bottom; when the water level in the reservoir drops sharply from a higher water level to a dead water level, the water below the anti-seepage panel has no time to dissipate, and causes the water pressure below the anti-seepage panel to be greater than the water pressure above the anti-seepage panel. The water with a pressure below the anti-seepage panel higher than the pressure above the anti-seepage panel forms high-pressure water, and the cover plate is pushed open by the high-pressure water, and then the high-pressure water under the anti-seepage panel is discharged into the reservoir above the anti-seepage panel, thereby avoiding the anti-seepage panel from being damaged by the lower high-pressure water. At the same time, since the high-pressure water under the anti-seepage panel flows into the reservoir, the loss of water volume in the reservoir can be reduced, and thus the loss of power generation in the reservoir can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The diagram is a structural diagram of a drainage and pressure reducing device for an anti-seepage panel at the bottom of a reservoir in a pumped storage power station according to the present invention.

[0023] Description of reference numerals in the figures:

[0024] 1. Anti-seepage panel; 2. Drainage cushion layer; 3. Pressure relief pipe; 31. Water stop ring; 4. Mesh plate; 41. Annular area; 5. Cover plate; 6. Guide rod; 61. Guide part; 62. Limiting part; 7. Pressure plate; 8. Water stop pad; 9. Permeable protective cover; 91. Enclosed cavity; 10. Permeable sheet; 101. Extension part. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0029] like Figure 1 FIG. 1 shows an embodiment of a drainage pressure reducing device for an anti-seepage panel at the bottom of a pumped-storage power station reservoir according to the present invention. The drainage pressure reducing device for an anti-seepage panel at the bottom of a pumped-storage power station reservoir according to this embodiment includes an anti-seepage panel 1, a drainage pad 2, a pressure relief pipe 3, and a cover plate 5. The anti-seepage panel 1 is used to prevent seepage from entering the reservoir basin. The anti-seepage panel 1 is provided with at least one mounting hole. The drainage pad 2 is disposed below the anti-seepage panel 1 and allows water beneath the anti-seepage panel 1 to flow below the mounting hole. The pressure relief pipe 3 is mounted within the mounting hole. The cover plate 5 has a closed position for closing the top opening of the pressure relief pipe 3 and an open position for opening the top opening of the pressure relief pipe 3. The cover plate 5 is movably connected to the upper end of the pressure relief pipe 3 so that the cover plate 5 can move relative to the pressure relief pipe 3 between the closed and open positions in response to the pressure differential between the water pressure above and below the anti-seepage panel 1.

[0030] The anti-seepage panel 1 is a panel for preventing the reservoir basin from seeing through. The anti-seepage panel 1 can be of different types, which is not limited in this embodiment. For example, the anti-seepage panel 1 can be a concrete panel or a plastic panel.

[0031] This embodiment does not limit the type of drainage pad 2. For example, the drainage pad 2 can be a gravel pad with a thickness of 50 to 60 cm, or a sand pad. The drainage pad 2 can connect the water below the anti-seepage panel 1 through the pores between the gravel and / or sand particles to collect the water.

[0032] The pressure relief pipe 3 extends in the up-down direction. In this embodiment, there is no limitation on the cross-sectional shape of the pressure relief pipe 3. For example, the cross-sectional shape of the pressure relief pipe 3 can be circular or rectangular. The opening on the anti-seepage panel 1 is adapted to the cross-sectional shape of the pressure relief pipe 3. The pressure relief pipe 3 passes through the anti-seepage panel 1 through the opening and is arranged on the anti-seepage panel 1. The water in the upper reservoir of the anti-seepage panel 1 and the water in the lower part of the anti-seepage panel 1 are connected through the pressure relief pipe 3. The upper end of the pressure relief pipe 3 is connected to a cover plate 5. When the water pressure above the anti-seepage panel 1 is greater than the water pressure below the anti-seepage panel 1, the cover plate 5 is in a covering position due to the pressure difference of the water. At this time, the cover plate 5 closes the upper end opening of the pressure relief pipe 3, and the water in the upper reservoir of the anti-seepage panel 1 cannot flow to the bottom of the anti-seepage panel 1. When the water pressure below the anti-seepage panel 1 is greater than the water pressure above the anti-seepage panel 1, the cover plate 5 is pushed open by the water pressure difference, so that the cover plate 5 is in the open position. At this time, high-pressure water can flow into the reservoir above the anti-seepage panel 1 through the pressure relief pipe 3. After the high-pressure water flows to the reservoir above the anti-seepage panel 1, the water pressure under the anti-seepage panel 1 is reduced, thereby avoiding the anti-seepage panel 1 from being damaged by the water pressure from the bottom. At the same time, since the high-pressure water under the anti-seepage panel 1 flows into the reservoir, the loss of water in the reservoir can be reduced, and thus the loss of power generation in the reservoir can be reduced.

[0033] Preferably, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes a guide rod 6, which has a guide portion 61 extending in the up and down directions and a limiting portion 62 connected to the top of the guide portion 61, the cross-sectional area of ​​the guide portion 61 is smaller than the cross-sectional area of ​​the limiting portion 62, the bottom end of the guide portion 61 is connected to the upper end of the pressure relief pipe 3, the cover plate 5 is provided with a guide hole, and the guide portion 61 is used to fit in the guide hole to guide the cover plate 5 to move between the upper end of the pressure relief pipe 3 and the limiting portion 62.

[0034] Specifically, the guide portion 61 is in the shape of a rod extending vertically. The top end of the guide portion 61 is connected to a limit portion 62. The limit portion 62 protrudes horizontally from the guide portion 61, so that the cross-sectional area of ​​the guide portion 61 is smaller than that of the limit portion 62. After the guide rod 6 is fixed to the upper end of the pressure relief pipe 3, the cover plate 5 cooperates with the guide portion 61 through the guide hole to guide the guide portion 61 and can move up and down between the limit portion 62 of the guide rod 6 and the upper end of the pressure relief pipe 3. When the water pressure above the anti-seepage panel 1 is greater than the water pressure below the anti-seepage panel 1, the cover plate 5 moves downward under the guidance of the guide portion 61 under the action of the water pressure and its own weight, and closes the upper end of the pressure relief pipe 3, preventing water in the water reservoir above the anti-seepage panel 1 from flowing below the anti-seepage panel 1. When the water pressure below the anti-seepage panel 1 is greater than the water pressure above the anti-seepage panel 1, the high-pressure water pushes the cover plate 5 upward and is stopped by the limit portion 62. At this time, the upper end of the pressure relief pipe 3 is opened, and the high-pressure water can flow to the reservoir above the anti-seepage panel 1. During the movement of the cover plate 5, the guide portion 61 can prevent the cover plate 5 from deviating from the upper end of the pressure relief pipe 3, which may cause the cover plate 5 to be unable to close the pressure relief pipe 3. The limiting portion 62 can ensure that the guide hole of the cover plate 5 is always coordinated with the limiting portion 62 and prevent the cover plate 5 from being lost.

[0035] In this embodiment, there is no limitation on the connection method between the guide portion 61 and the upper end of the pressure relief pipe 3. The connection method between the guide portion 61 and the upper end of the pressure relief pipe 3 can be a threaded connection, welding, or bonding. When the guide portion 61 is welded or bonded to the upper end of the pressure relief pipe 3, the guide portion 61 is first passed through the guide hole of the cover plate 5, and then the cover plate 5 is moved to the end of the guide portion 61 close to the limiting portion 62, and finally the lower end of the guide portion 61 is welded or bonded to the upper end of the pressure relief pipe 3.

[0036] In this embodiment, there is no limitation on the connection method between the guide part 61 and the limiting part 62. For example, the limiting part 62 can be a nut, and the upper end of the guide part 61 is threadedly connected to the nut. The limiting part 62 and the guide part 61 can also be formed as one piece, and the limiting part 62 and the guide part 61 can also be connected by welding.

[0037] It is understood that the cover plate 5 and the upper end of the pressure relief pipe 3 can also be rotatably connected. When the water pressure above the anti-seepage panel 1 is greater than the water pressure below the anti-seepage panel 1, the cover body 5 rotates downward under the action of the water pressure and its own weight and closes the upper end of the pressure relief pipe 3. When the water pressure below the anti-seepage panel 1 is greater than the water pressure above the anti-seepage panel 1, the high-pressure water pushes the cover plate 5 to rotate upward and open the upper end of the pressure relief pipe 3. The cover plate 5 is a steel plate.

[0038] More preferably, the guide holes of the guide rods 6 and the cover plate 5 are arranged in a plurality of intervals along the circumference of the pressure relief pipe 3 and correspond one to one with each other. Thus, the cooperation between the guide portions 61 of the guide rods 6 and the guide holes of the cover plate 5 can prevent the cover plate 5 from rotating relative to the pressure relief pipe 3, thereby preventing the cover plate 5 from being unable to cover the upper end of the pressure relief pipe 3.

[0039] In a specific embodiment, Figure 1 As shown, a pressure plate 7 is provided at the top of the pressure relief pipe 3. The pressure plate 7 is connected to the outer peripheral wall of the top of the pressure relief pipe 3 and extends along the circumference of the pressure relief pipe 3 and is closed for one circle. When the water pressure on the upper part of the anti-seepage panel 1 is greater than the water pressure on the lower part of the anti-seepage panel 1, the water pressure above the anti-seepage panel 1 is loaded onto the pressure plate 7 through the cover plate 5. Since the pressure plate 7 is connected to and protrudes from the outer peripheral wall of the pressure relief pipe 3, and the lower end face of the pressure plate 7 is provided with the anti-seepage panel 1, the pressure plate 7 can transmit the water pressure to the anti-seepage panel 1, thereby preventing the water pressure from pushing the pressure relief pipe 3 through the cover plate 5 and causing the pressure relief pipe 3 to fall off the anti-seepage panel 1. At the same time, the pressure plate 7 can be in close contact with the anti-seepage panel 1 after being subjected to water pressure, and the contact surface between the pressurized pressure plate 7 and the anti-seepage panel 1 can form an anti-seepage path to improve the sealing between the pressure relief pipe 3 and the anti-seepage panel 1.

[0040] More preferably, Figure 1 As shown, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes an annular water-stopping pad 8, which is located between the pressure plate 7 and the cover plate 5, and is fixedly connected to the pressure plate 7.

[0041] This embodiment does not limit the material type of the water-stop pad 8. For example, the water-stop pad 8 can be made of rubber or plastic. The water-stop pad 8 can be bonded to the upper end face of the pressure plate 7, or only a mounting hole can be provided on the water-stop pad 8. The water-stop pad 8 is sleeved on the guide portion 61 through the mounting hole and falls onto the upper end face of the pressure plate 7. When the water pressure on the upper part of the anti-seepage panel 1 is greater than the water pressure on the lower part of the anti-seepage panel 1, the water pressure pushes the cover plate 5 to press the cover plate 5, the water-stop pad 8 and the pressure plate 7 together. At this time, the water-stop pad 8 is compressed and deformed between the cover plate 5 and the pressure plate 7, and can seal the cover plate 5 and the pressure plate 7.

[0042] In a specific embodiment, Figure 1 As shown, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes a water-permeable protective cover 9 with an opening facing downward. The water-permeable protective cover 9 is connected to the anti-seepage panel 1 to form a closed cavity 91, and the cover plate 5 is accommodated in the closed cavity 91.

[0043] The present embodiment does not limit the type of water-permeable protective cover 9. For example, the water-permeable protective cover 9 can be made of a steel grille or a perforated steel plate. The water-permeable protective cover 9 allows water to flow freely while preventing debris, weeds, garbage, etc. from entering the reservoir and clogging the pressure relief pipe 3.

[0044] In a specific embodiment, Figure 1 As shown, the pressure relief pipe 3 is provided with a water stop ring 31 , which is connected to the outer peripheral wall of the middle portion of the pressure relief pipe 3 and buried in the anti-seepage panel 1 .

[0045] It should be noted that the middle portion of the pressure relief pipe 3 refers to the area between the upper end and the lower end of the pressure relief pipe 3. When installing the pressure relief pipe 3 on the anti-seepage panel 1, the pressure relief pipe 3 is first placed on the plane to be cast, and then the water stop ring 31 on the pressure relief pipe 3 is cast and immersed. After the casting solidifies, the anti-seepage panel 1 is formed. At this time, the water stop ring 31 is buried in the anti-seepage panel 1, and a reciprocating tortuous contact surface is formed between the water stop ring 31 and the anti-seepage panel 1. The reciprocating tortuous contact surface can form a reciprocating tortuous anti-seepage path to improve the sealing between the pressure relief pipe 3 and the anti-seepage panel 1.

[0046] In a specific embodiment, Figure 1 As shown, the drainage and pressure reducing device for the anti-seepage panel at the bottom of the reservoir of a pumped storage power station also includes a permeable sheet 10, which is connected to and blocks the pipe opening at the lower end of the pressure relief pipe 3. The permeable sheet 10 is used to stop the granular gravel outside the pressure relief pipe 3.

[0047] This embodiment does not limit the type of the water-permeable sheet 10. For example, the water-permeable sheet 10 can be a geotextile or a plastic film with fine mesh. When the water pressure below the anti-seepage panel 1 is greater than the water pressure above the anti-seepage panel 1, the pressurized water passes through the water-permeable sheet 10 and enters the reservoir above the anti-seepage panel 1 through the pressure relief pipe 3. At this time, the fine particles of gravel under the anti-seepage panel 1 are blocked outside the pressure relief pipe 3 by the water-permeable sheet 10. This can prevent the fine particles of gravel under the anti-seepage panel 1 from flowing into the reservoir above the anti-seepage panel 1, thereby preventing the anti-seepage panel 1 from collapsing due to lack of support below the anti-seepage panel 1.

[0048] More preferably, as shown in the figure, a mesh plate 4 is provided between the pipe opening at the lower end of the pressure relief pipe 3 and the water-permeable sheet 10 , and the mesh plate 4 abuts against the water-permeable sheet 10 .

[0049] When the water pressure at the bottom of the anti-seepage panel 1 is greater than the water pressure at the top of the anti-seepage panel 1, the pressurized water enters the reservoir above the anti-seepage panel 1 through the water-permeable sheet 10, the mesh plate 4 and the pressure relief pipe 3 in sequence. During the process of high-pressure water entering the reservoir, the water-permeable sheet 10 is pushed by the high-pressure water and comes into contact with the mesh plate 4. At this time, the mesh plate 4 can prevent the water-permeable sheet 10 from deforming and entering the interior of the pressure relief pipe 3, thereby ensuring that the water-permeable sheet 10 can block the fine particles of gravel under the anti-seepage panel 1 outside the pressure relief pipe 3.

[0050] More preferably, the mesh plate 4 is fixedly connected to the pressure relief pipe 3, and in a plane perpendicular to the extension direction of the pressure relief pipe 3, the mesh plate 4 has an annular area 41 provided on the outer periphery of the pressure relief pipe 3. In this way, the annular area 41 of the mesh plate 4 and the pressure-bearing plate 7 can be clamped to the anti-seepage panel 1, so that when the pressure relief pipe 3 is subjected to water pressure in the vertical direction, the pressure relief pipe 3 can remain stable relative to the anti-seepage panel 1. At the same time, the contact surface between the annular area 41 and the anti-seepage panel 1 extends the anti-seepage path between the pressure relief pipe 3 and the anti-seepage panel 1, thereby improving the sealing between the pressure relief pipe 3 and the anti-seepage panel 1.

[0051] In this embodiment, there is no limitation on the connection method of the mesh plate 4, the pressure relief pipe 3 and the pressure bearing plate 7. For example, the mesh plate 4, the pressure relief pipe 3 and the pressure bearing plate 7 can be integrally formed or connected by welding.

[0052] More preferably, Figure 1 As shown, the water-permeable sheet 10 has an extension portion 101 , which extends away from the pressure relief pipe 3 and perpendicular to the extension direction of the pressure relief pipe 3 , and protrudes from the edge of the mesh plate 4 to connect with the anti-seepage panel 1 .

[0053] When the water pressure at the bottom of the anti-seepage panel 1 is greater than the water pressure at the top of the anti-seepage panel 1, and seepage occurs between the pressure relief pipe 3 and the anti-seepage panel 1, the extension portion 101 of the permeable sheet 10 can prevent fine particles of gravel from entering the reservoir through the seepage path between the pressure relief pipe 3 and the anti-seepage panel 1, thereby avoiding the collapse of the anti-seepage panel 1 due to lack of support below the anti-seepage panel 1.

[0054] Compared with the existing technology, this application has at least the following beneficial technical effects:

[0055] The device of the present application has a simple structure and is easy to install. Using this device eliminates the need for a drainage gallery at the reservoir bottom, saving engineering investment. While meeting the requirements for good anti-seepage performance at the reservoir bottom, it also reduces the possibility of the anti-seepage panels at the reservoir bottom becoming unstable due to reverse water pressure. Furthermore, it allows some seepage water from the reservoir bottom to be drained into the reservoir, reducing the total water loss within the reservoir.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir, characterized in that: include: An anti-seepage panel (1), the anti-seepage panel (1) is used for preventing the seepage of a reservoir basin, and the anti-seepage panel (1) is provided with at least one mounting through hole; A drainage pad (2) is provided below the anti-seepage panel (1), and the drainage pad (2) can allow water under the anti-seepage panel (1) to flow to below the installation through hole. A pressure relief pipe (3), the pressure relief pipe (3) being installed in the installation through hole; A cover plate (5), wherein the cover plate (5) has a covering position capable of closing the top end opening of the pressure relief pipe (3) and an open position capable of opening the top end opening of the pressure relief pipe (3); the cover plate (5) is movably connected to the top end of the pressure relief pipe (3) so that the cover plate (5) can switch between the covering position and the open position relative to the pressure relief pipe (3) under the pressure difference between the water pressure above and the water pressure below the anti-seepage panel (1).

2. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 1, characterized in that: The invention also includes a guide rod (6), wherein the guide rod (6) has a guide portion (61) extending in the up-down direction and a limiting portion (62) connected to the top end of the guide portion (61), the cross-sectional area of ​​the guide portion (61) is smaller than the cross-sectional area of ​​the limiting portion (62), the bottom end of the guide portion (61) is connected to the top end of the pressure relief pipe (3), and the cover plate (5) is provided with a guide hole, and the guide portion (61) is used to fit in the guide hole to guide the cover plate (5) to move between the top end of the pressure relief pipe (3) and the limiting portion (62).

3. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 1, characterized in that: A pressure-bearing plate (7) is provided at the top end of the pressure relief pipe (3). The pressure-bearing plate (7) is connected to the outer peripheral wall of the top end of the pressure relief pipe (3) and extends along the circumference of the pressure relief pipe (3) and is closed for one circle.

4. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 3, characterized in that: It also includes an annular water-stopping pad (8), which is arranged between the pressure-bearing plate (7) and the cover plate (5), and the water-stopping pad (8) is fixedly connected to the pressure-bearing plate (7).

5. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 1, characterized in that: It also comprises a water-permeable protective cover (9) with an opening facing downwards, wherein the water-permeable protective cover (9) is connected to the anti-seepage panel (1) to form a closed cavity (91), and the cover plate (5) is accommodated in the closed cavity (91).

6. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 1, characterized in that: The pressure relief pipe (3) is provided with a water stop ring (31), and the water stop ring (31) is connected to the outer peripheral wall of the middle part of the pressure relief pipe (3) and is buried in the anti-seepage panel (1).

7. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 1, characterized in that: It also includes a water-permeable sheet (10), which is connected to and blocks the pipe opening at the bottom end of the pressure relief pipe (3), and is used to stop the granular gravel outside the pressure relief pipe (3).

8. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 7, characterized in that: A mesh plate (4) is provided between the pipe opening at the bottom end of the pressure relief pipe (3) and the water-permeable sheet (10), and the mesh plate (4) is in contact with the water-permeable sheet (10).

9. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 8, characterized in that: The mesh plate (4) is fixedly connected to the pressure relief pipe (3), and in a plane perpendicular to the extension direction of the pressure relief pipe (3), the mesh plate (4) has an annular area arranged on the outer periphery of the pressure relief pipe (3).

10. The drainage and pressure reducing device for the anti-seepage panel at the bottom of a pumped storage power station reservoir according to claim 9, characterized in that: The water-permeable sheet (10) has an extension portion (101), which extends away from the pressure relief pipe (3) and perpendicular to the extension direction of the pressure relief pipe (3), and protrudes from the edge of the mesh plate (4) to connect with the anti-seepage panel (1).

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