Pumped storage power station tail water device crossing creep deformation active fault

Abstract

The utility model discloses a pumped storage power station tail water device penetrating through a creeping deformation active fault, which comprises a buried pipe penetrating through the creeping deformation active fault, the buried pipe comprises a pressure steel pipe, a column reinforced concrete lining is sleeved outside the pressure steel pipe, and the pressure steel pipe and the reinforced concrete lining are coaxially arranged. An annular cavity is defined by the pressure steel pipe and the reinforced concrete lining, the annular cavity is filled with a polyurethane cork cushion layer, a plurality of corrugated pipes are arranged between the buried pipe and the creep deformation active fault and connected with the side wall of the buried pipe, and a lock chamber is arranged on the buried pipe. The pumped storage power station tail water device penetrating through the creeping deformation active fault solves the technical problems that in the prior art, when facing the creeping deformation active fault, a tail water system cannot effectively adapt to long-term slow deformation and slippage of the creeping deformation active fault, and the stability and the fracture resistance of the system are poor.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumped - storage power station engineering, and particularly relates to a tail - water device of a pumped - storage power station crossing a creeping and deforming active fault. Background Technique

[0002] With the continuous progress of the construction of pumped - storage power stations, the existence of creeping and deforming active faults has posed severe challenges to the layout of the water conveyance system and the design of the tail - water system. Generally, in the face of creeping and deforming active faults, the water conveyance system of a pumped - storage power station often adopts an avoidance strategy during layout to reduce the impact of fault activities on the system. However, this avoidance method is not always feasible, especially in cases of complex terrain or limited space, which requires engineering designers to fully consider the impact of the fault and explore other effective solutions to ensure the safety and stability of the project.

[0003] The patent with the name "A Tail - Water System of a Pumped - Storage Power Station Crossing an Active Fault in a High Seismic Intensity Area", with the publication number: CN218540616U and the publication date: February 28, 2023, discloses a tail - water system of a pumped - storage power station crossing an active fault in a high seismic intensity area, including an underground buried pipe. Within the range where the buried pipe passes through the active fault, spherical compensators are arranged on both sides and in the middle of the active fault and connected to the buried pipe. The buried pipe consists of an internal steel pipe and an external reinforced concrete lining; the prior art has successfully solved the technical problems regarding the safety of the tail - water system of a pumped - storage power station by comprehensively considering geological activities, seismic design, water flow control, and economy. However, when the existing tail - water system faces a creeping and deforming active fault, it still cannot effectively adapt to its long - term slow deformation and slip, resulting in poor stability and anti - fracture ability of the system, which has become a technical problem to be urgently solved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a tail - water device of a pumped - storage power station crossing a creeping and deforming active fault, which solves the technical problem that the existing tail - water system cannot effectively adapt to its long - term slow deformation and slip when facing a creeping and deforming active fault, resulting in poor stability and anti - fracture ability of the system.

[0005] The technical solution adopted by the utility model is that the tail - water device of a pumped - storage power station crossing a creeping and deforming active fault includes a buried pipe 1 passing through the creeping and deforming active fault 4. The buried pipe 1 includes a penstock 6, and a cylindrical reinforced concrete lining 5 is sleeved outside the penstock 6. The penstock 6 and the reinforced concrete lining 5 are coaxially arranged, and an annular cavity is formed between the penstock 6 and the reinforced concrete lining 5. The annular cavity is filled with a polyurethane cork cushion 8. A plurality of bellows 3 are arranged between the buried pipe 1 and the creeping and deforming active fault 4. The bellows 3 are connected to the side wall of the buried pipe 1, and a gate chamber 2 is arranged on the buried pipe 1.

[0006] The features of the present utility model also lie in that:

[0007] The filled part of the polyurethane cork cushion layer 8 in the annular cavity is in a sector-annular shape, and the included angle formed by the extension lines of the diameters at both ends of the sector-annular shape of the polyurethane cork cushion layer 8 and the center of the circle is 240 - 260°.

[0008] A number of permanent joints 9 are provided in the reinforced concrete lining 5 in contact with the creeping and deforming active fault 4. The length direction of the permanent joints 9 is perpendicular to the axis direction of the reinforced concrete lining 5, and the permanent joints 9 are arranged at equal intervals in the reinforced concrete lining 5.

[0009] Rubber water stops 10 are provided at both ends of the permanent joint 9, and a copper water stop 11 is provided between the rubber water stops 10. The copper water stop 11 penetrates through the permanent joint 9.

[0010] The distance between two adjacent permanent joints 9 is 3 - 5 m.

[0011] An arc-shaped support 7 is provided between two adjacent permanent joints 9. The arc-shaped support 7 is arranged in contact with the reinforced concrete lining 5, and the arc-shaped support 7 is arranged close to the annular cavity without filling the polyurethane cork cushion layer 8. The center of the arc-shaped support 7 coincides with the center of the annular inner cavity.

[0012] The corrugated pipes 3 are arranged at equal intervals between the buried pipe 1 and the creeping and deforming active fault 4, and a connecting pipe 12 is provided between two adjacent corrugated pipes 3.

[0013] The beneficial effects of the present utility model are as follows: By enclosing a polyurethane cork cushion layer in the annular cavity between the penstock and the reinforced concrete lining, the present utility model is used to adapt to the relative slip between the upper plate and the lower plate of the creeping and deforming active fault to a certain extent, and by providing a number of corrugated pipes between the buried pipe and the creeping and deforming active fault, the technical problem that the existing tail water system cannot effectively adapt to its long-term slow deformation and slip when facing the creeping and deforming active fault, resulting in poor stability and anti-breaking ability of the system, is solved. Description of the Drawings

[0014] Figure 1 Structural schematic diagram of the tail water device of the pumped storage power station for crossing the creeping and deforming active fault;

[0015] Figure 2 Structural schematic diagram of the tail water device of the pumped storage power station for crossing the creeping and deforming active fault within the range of the creeping and deforming active fault;

[0016] Figure 3 Side view of the connection structure between the corrugated pipe and the penstock;

[0017] Figure 4 Structural schematic diagram at the arc-shaped support of the reinforced concrete lining;

[0018] Figure 5It is a schematic structural diagram of a rubber water stop and a copper water stop at the permanent joint.

[0019] In the figure, 1. Buried pipe, 2. Sluice chamber, 3. Bellows, 4. Creeping and deforming active fault, 5. Reinforced concrete lining, 6. Penstock, 7. Arcuate support, 8. Polyurethane cork cushion, 9. Permanent joint, 10. Rubber water stop, 11. Copper water stop, 12. Connecting pipe. Specific implementation mode

[0020] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0021] As Figure 1 , Figure 4 shown, the tailwater device of a pumped-storage power station crossing a creeping and deforming active fault includes a buried pipe 1 penetrating the creeping and deforming active fault 4. The buried pipe 1 includes a penstock 6. A columnar reinforced concrete lining 5 is sleeved outside the penstock 6. The penstock 6 and the reinforced concrete lining 5 are coaxially arranged. An annular cavity is formed between the penstock 6 and the reinforced concrete lining 5. The annular cavity is filled with a polyurethane cork cushion 8. The polyurethane cork cushion 8 is used to adapt to the relative slip of a part of the hanging wall and the footwall of the creeping and deforming active fault 4, and can reduce the creep deformation that the penstock 6 needs to bear. A plurality of bellows 3 are arranged between the buried pipe 1 and the creeping and deforming active fault 4 to help the penstock 6 adapt to part of the creep deformation and prevent the penstock 6 from being damaged.

[0022] The bellows 3 are connected to the side wall of the buried pipe 1. A sluice chamber 2 is arranged on the buried pipe 1. When the buried pipe 1 is damaged due to the relative slip of a part of the hanging wall and the footwall of the creeping and deforming active fault 4, a gate is arranged in the upstream sluice chamber 2. The gate can be quickly closed to cut off the high-speed water flow in the flow channel and prevent the high-speed water flow in the flow channel from continuously entering the buried pipe 1 downstream of the sluice chamber, preventing the high-speed water flow from washing away the downstream buildings and improving the safety of the entire tailwater system, and can reduce losses.

[0023] As Figure 1 , Figure 2 , Figure 3 shown, an arcuate support 7 is arranged between two adjacent permanent joints 9. The arcuate support 7 is attached to the reinforced concrete lining 5. The arcuate support 7 is arranged close to the annular cavity not filled with the polyurethane cork cushion 8. The arcuate support 7 plays a supporting role for the penstock 6. A connecting pipe 12 is arranged between the bellows 3 to improve the integrity of the bellows 3, and at the same time restrict the deformation direction of the bellows 3 and improve the durability of the bellows 3. The center of the arcuate support 7 coincides with the center of the annular inner cavity. The bellows 3 are arranged at equal intervals between the buried pipe 1 and the creeping and deforming active fault 4, and a connecting pipe 12 is arranged between two adjacent bellows 3.

[0024] As Figure 4 ,Figure 5 As shown, the filled part of the polyurethane cork cushion layer 8 in the annular cavity is fan-shaped. The included angle formed by the extension lines of the diameters at both ends of the fan shape of the polyurethane cork cushion layer 8 and the center of the circle is 240° to 260°. A number of permanent joints 9 are provided in the reinforced concrete lining 5 in contact with the creep deformation active fault 4. The length direction of the permanent joints 9 is perpendicular to the axis direction of the reinforced concrete lining 5. The permanent joints 9 make the displacement distribution caused by the relative slip between the hanging wall and the footwall of the creep deformation active fault 4 uniform, avoiding large dislocations. The permanent joints 9 are arranged at equal intervals in the reinforced concrete lining 5. Rubber water stops 10 are provided at both ends of the permanent joints 9, and a copper water stop 11 is provided between the rubber water stops 10. The copper water stop 11 penetrates through the permanent joints 9. The distance between two adjacent permanent joints 9 is 3 to 5 m, preventing water seepage damage at the permanent joints 9.

[0025] The tailrace device of the pumped-storage power station passing through the creep deformation active fault of the present utility model has the following specific working process:

[0026] When the pumped-storage power station needs to drain water, the water flow enters the buried pipe 1 through the gate chamber 2 and flows into the penstock 6. The water flow flows in the penstock 6, and the generated pressure is transmitted to the surrounding soil and rock through the reinforced concrete lining 5, and also acts on the polyurethane cork cushion layer 8. Near the creep deformation active fault 4, due to the deformation that may be caused by geological activities, the setting of the bellows 3 can effectively absorb and relieve the pressure changes brought about by these deformations, preventing the buried pipe 1 from being subjected to excessive stress. The setting of the permanent joints 9 can effectively reduce the vibration and pressure fluctuations caused by the water flow. The rubber water stops 10 and the copper water stop 11 ensure the sealing of the system, preventing water from leaking through the gaps. The arc-shaped supports 7 arranged between two adjacent permanent joints 9 provide additional support, enhancing the stability of the lining, especially near the annular cavity where the polyurethane cork cushion layer 8 is not filled. The connecting pipes 12 between the bellows 3 enable multiple bellows 3 to be connected to each other, enhancing the flexibility and adaptability of the system and being able to better cope with geological changes.

[0027] Through the design of the above structure and working process, the tailrace system of the pumped-storage power station passing through the creep deformation active fault 4 can effectively cope with the challenges brought about by geological deformation, ensuring the safety and stability of the system. This design not only considers the smoothness of the water flow but also fully takes into account the complexity of the geological environment, providing a guarantee for the normal operation of the power station.

[0028] Embodiment 1

[0029] As Figure 1 , Figure 2 , Figure 5As shown in the figure, the tailwater device of a pumped-storage power station crossing a creeping and sliding active fault includes a buried pipe 1 passing through the creeping and sliding active fault 4. The buried pipe 1 includes a penstock 6. A reinforced concrete lining 5 in the shape of a cylinder is sleeved outside the penstock 6. The penstock 6 and the reinforced concrete lining 5 are coaxially arranged. An annular cavity is formed between the penstock 6 and the reinforced concrete lining 5. The annular cavity is filled with a polyurethane cork cushion 8. A number of bellows 3 are arranged between the buried pipe 1 and the creeping and sliding active fault 4. The bellows 3 are connected to the side wall of the buried pipe 1. A gate chamber 2 is arranged on the buried pipe 1; the filled part of the polyurethane cork cushion 8 in the annular cavity is in a sector-annular shape. The included angle formed by the extension lines of the diameters at both ends of the sector-annular shape of the polyurethane cork cushion 8 and the center of the circle is 240° - 260°; a number of permanent joints 9 are arranged in the reinforced concrete lining 5 in contact with the creeping and sliding active fault 4. The length direction of the permanent joints 9 is perpendicular to the axial direction of the reinforced concrete lining 5. The permanent joints 9 are arranged at equal intervals in the reinforced concrete lining 5; rubber waterstops 10 are arranged at both ends of the permanent joints 9. A copper waterstop 11 is arranged between the rubber waterstops 10. The copper waterstop 11 penetrates through the permanent joints 9; the distance between two adjacent permanent joints 9 is 3 - 5 m.

[0030] Embodiment 2

[0031] As Figure 3 , Figure 4 shown in the figure, on the basis of Embodiment 1, an arc-shaped support 7 is arranged between two adjacent permanent joints 9. The arc-shaped support 7 is arranged in contact with the reinforced concrete lining 5. The arc-shaped support 7 is arranged close to the annular cavity not filled with the polyurethane cork cushion 8. The center of the arc-shaped support 7 coincides with the center of the annular inner cavity.

[0032] Embodiment 3

[0033] As Figure 3 shown in the figure, on the basis of Embodiment 2, the bellows 3 are arranged at equal intervals between the buried pipe 1 and the creeping and sliding active fault 4. A connecting pipe 12 is arranged between two adjacent bellows 3.

Claims

1. A tailwater device for a pumped storage power station crossing an active creep deformation fault, characterized in that: The invention comprises a buried pipe (1) penetrating a creep deformation active fault (4), the buried pipe (1) comprising a pressure steel pipe (6), a columnar reinforced concrete lining (5) is provided on the outer surface of the pressure steel pipe (6), the pressure steel pipe (6) and the reinforced concrete lining (5) are coaxially arranged, an annular cavity is formed between the pressure steel pipe (6) and the reinforced concrete lining (5), the annular cavity is filled with a polyurethane cork cushion layer (8), a plurality of corrugated pipes (3) are provided between the buried pipe (1) and the creep deformation active fault (4), the corrugated pipes (3) are connected to the side wall of the buried pipe (1), and a gate chamber (2) is provided on the buried pipe (1).

2. The tailwater device of a pumped storage power station crossing a creep deformation active fault according to claim 1 is characterized in that: The portion of the annular cavity filled with the polyurethane cork cushion layer (8) is in the shape of a fan ring, and the angle formed by the extended lines of the diameters at both ends of the fan ring of the polyurethane cork cushion layer (8) and the center of the circle is 240-260°.

3. The tailwater device of a pumped storage power station crossing a creep deformation active fault according to claim 2 is characterized in that: A plurality of permanent joints (9) are arranged in the reinforced concrete lining (5) in contact with the creep deformation active fault (4). The length direction of the permanent joints (9) is perpendicular to the axial direction of the reinforced concrete lining (5). The permanent joints (9) are arranged at equal intervals in the reinforced concrete lining (5).

4. The tailwater device of a pumped storage power station crossing a creep deformation active fault according to claim 3 is characterized in that: Both ends of the permanent seam (9) are provided with rubber waterstops (10), copper waterstops (11) are provided between the rubber waterstops (10), and the copper waterstops (11) are provided throughout the permanent seam (9).

5. The tailwater device of a pumped storage power station crossing a creep deformation active fault according to claim 4 is characterized in that: The distance between two adjacent permanent joints (9) is 3 to 5 m.

6. The tailwater device of a pumped storage power station crossing a creep deformation active fault according to claim 5, characterized in that: An arc support (7) is provided between two adjacent permanent joints (9), the arc support (7) is arranged in close contact with the reinforced concrete lining (5), the arc support (7) is arranged close to the annular cavity not filled with the polyurethane cork cushion layer (8), and the center of the arc support (7) coincides with the center of the annular inner cavity.

7. The tailwater device of a pumped storage power station crossing an active creep deformation fault according to claim 6, characterized in that: The bellows (3) are arranged at equal intervals between the buried pipe (1) and the creep deformation active fault (4), and a connecting pipe (12) is provided between two adjacent bellows (3).

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