Pumped storage power station reservoir basin flood inverted siphon storage structure and construction method thereof

Abstract

The invention provides a reservoir basin flood inverted siphon storage structure of a pumped storage power station, and relates to the technical field of water-power engineering pumped storage power stations, and the reservoir basin flood inverted siphon storage structure comprises an inlet control device which is connected with a reservoir surrounding highway interception and drainage ditch and comprises a flood storage water inlet and a trash rack, and the trash rack is arranged between a water and sediment diversion structure and an inverted siphon channel; the water-sediment diversion structure comprises a desilting basin communicated with the flood storage water inlet; the inverted siphon channel comprises a vertical shaft and an adit, the vertical shaft is connected with the desilting basin, the bottom end of the vertical shaft is connected with an inlet of the adit, and an outlet of the adit extends into the pumped storage basin. The problem that catchment water on the periphery of a traditional pumping storage basin can only be drained and cannot be utilized, and water source waste is caused is solved, considerable rainfall can be reasonably utilized, the water storage time is shortened, and evaporation leakage loss is supplemented.

Description

Technical Field

[0001] The invention relates to the technical field of pumped storage power stations in hydropower projects, in particular to a pumped storage power station reservoir basin flood inverted siphon suction reservoir structure and a construction method thereof. Background Art

[0002] Pumped-storage power station reservoir basins, particularly those surrounding the upper reservoir, receive significant annual water. Traditional pumped-storage systems can only drain this water, leaving it unused. This wastes water and increases storage time. Utilizing floodwater effectively could accelerate water storage and compensate for evaporation and seepage losses. However, there's currently no effective method for channeling this floodwater into the reservoir basin. Designers have proposed installing energy-dissipating steps inside the dam surface to allow floodwater to enter the reservoir directly. However, various attempts have failed due to numerous design and implementation issues. To address these issues, it's imperative to design a structure and construction method that efficiently channels floodwater into the reservoir. Summary of the Invention

[0003] The present invention provides a pumped storage power station reservoir basin flood inverted siphoning reservoir structure and a construction method thereof, aiming to solve at least one technical problem existing in the prior art mentioned in the background technology.

[0004] The present invention provides the following technical solutions to achieve the above objectives: A pumped storage power station reservoir basin flood inverted siphon suction reservoir structure, including an inlet control device, connected to the intercepting drainage ditch of the ring road around the reservoir, including a flood inlet and a trash rack, the trash rack is arranged between the water and sediment diversion structure and the inverted siphon channel; a water-sediment diversion structure, including a sedimentation basin connected to the floodwater inlet; The inverted siphon channel includes a vertical shaft and a horizontal tunnel. The vertical shaft is connected to the sedimentation tank, the bottom end of the vertical shaft is connected to the horizontal tunnel inlet, and the horizontal tunnel outlet extends to the pumped storage reservoir basin.

[0005] Furthermore, a maintenance ladder is provided on one side of the sedimentation tank.

[0006] A construction method for a flood inverted siphoning structure in a pumped storage power station reservoir basin comprises the following steps: S1. During the construction of the reservoir basin, the inverted siphon suction reservoir structure is constructed simultaneously; S2. Excavate the exit first, and then excavate a bottom flat tunnel from the reservoir basin. Use the bottom flat tunnel as a slag discharge channel, and then excavate the vertical shaft section; S3. Support the excavation working surface, and ensure that the supporting working surface is closely aligned with the excavation working surface; S4. After excavation and support are completed, concrete pouring operation is carried out; S5. After the concrete pouring is completed, the metal structure of the inverted siphon suction reservoir is installed; S6. Carry out anti-seepage treatment on the connection parts between the inlet control device and the water supply and drainage ditch around the reservoir, as well as the outlet entering the reservoir.

[0007] Furthermore, the vertical shaft section of step S2 is selected and arranged on the thick watershed rock mass around the reservoir.

[0008] Furthermore, the excavation of the vertical shaft section adopts a raise boring method.

[0009] Furthermore, the support measure adopts anchor spraying support.

[0010] Furthermore, the lining concrete of the shaft is constructed by hanging prefabricated concrete pipes or by cast-in-situ concrete lining.

[0011] Furthermore, the concrete lining construction is constructed from top to bottom using a slipform cast-in-place method, and the concrete lining construction of a section is carried out after a section is excavated.

[0012] Furthermore, the metal structure includes a trash rack and an inspection ladder.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) It solves the problem that the water collected around the basin of traditional pumped storage can only be drained but not used, resulting in water waste. It can make rational use of the considerable rainfall, reduce the initial water storage time, and make up for evaporation and leakage losses.

[0014] (2) There is currently no better method for diverting floodwaters into the reservoir basin. The structure and construction method proposed in this invention are practical and can be used to efficiently divert floodwaters into the reservoir. It can be used as a water replenishment project that should be constructed for the reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of the inverted siphon suction reservoir structure of the present invention; Figure 2 This is a large-scale drawing of the inlet of the inverted siphon suction reservoir structure of the present invention; Figure 1: 1-pumped storage reservoir basin; 2-vertical anti-seepage curtain; 3-impermeable rock layer; 4-intercepting drainage ditch around the reservoir by the ring road; 5-flood water inlet; 6-sand settling tank; 7-flood inverted siphon suction channel into the reservoir; 8-trash rack; 9-maintenance ladder; 10-ground line on the top of the reservoir basin. DETAILED DESCRIPTION

[0016] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0017] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0019] Embodiment. A pumped storage power station reservoir basin flood inverted siphon suction reservoir structure, the structure reference Figure 1 and 2 , including an inlet control device, connected to the intercepting drainage ditch 4 of the ring road around the reservoir, including a flood inlet 5 and a trash rack 8, the trash rack 8 is arranged between the water and sediment diversion structure and the inverted siphon channel 7; The water-sediment diversion structure includes a sedimentation tank 6 connected to the flood inlet 5; the water-sediment diversion structure mainly consists of the concrete structure of the inlet sedimentation tank and the inlet trash rack. This structure is arranged at the inlet to prevent sediment from entering the reservoir, reduce wear on the structure and ensure that the flow capacity is not affected. Sediment in the sedimentation tank needs to be cleaned regularly.

[0020] The inverted siphon channel 7 includes a vertical shaft and a horizontal tunnel. The vertical shaft is connected to the sedimentation tank 6. The bottom end of the vertical shaft is connected to the horizontal tunnel inlet. The horizontal tunnel outlet extends to the pumped storage reservoir basin 1.

[0021] A maintenance ladder 9 is provided on one side of the sedimentation tank 6 to support regular silt removal.

[0022] A construction method for a flood inverted siphoning structure in a pumped storage power station reservoir basin, characterized by comprising the following steps: S1. During the construction of the reservoir basin, the inverted siphon suction reservoir structure is constructed simultaneously; S2. Excavate the exit first, and then excavate a bottom flat tunnel from the reservoir basin. Use the bottom flat tunnel as a slag discharge channel, and then excavate the vertical shaft section; S3. Support the excavation working surface, and ensure that the supporting working surface is closely aligned with the excavation working surface; S4. After excavation and support are completed, concrete pouring operation is carried out; S5. After the concrete pouring is completed, the metal structure of the inverted siphon suction reservoir is installed; S6. Conduct anti-seepage treatment at the connection between the inlet control device and the surrounding water supply and drainage ditch, as well as at the outlet entrance. Complete the retaining structure at the connection between the inlet and the surrounding water supply and drainage ditch, ensuring integration with the surrounding drainage channel and directing water flow into the inverted siphon. If the reservoir basin anti-seepage method uses full-basin anti-seepage, the integration of the inverted siphon outlet at the entrance to the reservoir and the anti-seepage structure must also be addressed. Ensure proper integration and anti-seepage measures are in place. Once completed, the reservoir can be used for water storage, evaporation replenishment, and leakage replenishment.

[0023] The above steps complete the construction of this structure. After construction is completed, it enters the operational phase. This structure can be used to store water in the reservoir, replenish water from evaporation, and replenish water from leakage. Sediment in the sedimentation basin must be cleaned regularly to prevent silt from entering the reservoir.

[0024] The vertical shaft section of step S2 is selected and arranged on the thick watershed rock mass around the reservoir. For the selection of the vertical shaft line, it is recommended to select the thick watershed rock mass around the reservoir to ensure the vertical and lateral burial depth. The rock is solid, which meets the conditions for tunneling, facilitates the acceleration of construction progress and is conducive to safety during construction. When the surrounding rock conditions are good and the vertical shaft depth is appropriate, it is advisable to use a reverse boring rig to construct the vertical shaft part of the tunnel. A limited slag discharge channel is formed at the bottom, and gravity is used as much as possible to remove slag. When automatic slag removal is not possible, an electric slag scraper should be used to assist in slag removal. At the entrance of the vertical shaft, a pilot hole is first drilled using a reverse boring rig to form a pilot shaft from bottom to top, and then the pilot shaft is expanded by controlled drilling and blasting to form the designed section.

[0025] The vertical shaft section was excavated using a raise boring rig. Anchor shotcrete support was used as the support measure. After excavation and support were completed, the process transitioned to concrete pouring. The tunnel cross-section is circular, and the corresponding lining structure is a circular reinforced concrete structure. The lining structure was constructed using the slipform cast-in-place method, with construction progressing from top to bottom, with each excavation step followed. Alternatively, precast concrete pipes could be installed or cast-in-place concrete lining could be used, depending on the construction conditions.

[0026] The shaft lining concrete is constructed by hoisting precast concrete pipes or casting in situ concrete lining. The concrete lining is constructed from top to bottom using the slipform casting method, with the concrete lining construction of each section being carried out after each excavation.

[0027] The metal structure includes a trash rack 8 and an inspection ladder 9.

[0028] Obviously, the above is only a partial embodiment of the present invention, not all embodiments. The above embodiments are not intended to limit the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any combination, modification, equivalent replacement, improvement, and other embodiments that can be made by those of ordinary skill in the art within the spirit and principles of the present invention shall be within the scope of protection of the present invention.

Claims

1. A pumped storage power station reservoir basin flood inverted siphon suction reservoir structure, characterized by: It includes an inlet control device connected to the intercepting drainage ditch (4) of the ring road around the reservoir, and includes a flood inlet (5) and a trash rack (8). The trash rack (8) is arranged between the water and sediment diversion structure and the inverted siphon channel (7); a water-sediment diversion structure comprising a sedimentation basin (6) connected to a floodwater inlet (5); The inverted siphon channel (7) includes a vertical shaft and a horizontal tunnel, the vertical shaft is connected to the sedimentation tank (6), the bottom end of the vertical shaft is connected to the horizontal tunnel inlet, and the horizontal tunnel outlet extends into the pumped storage reservoir basin (1).

2. The pumped storage power station reservoir basin flood inverted siphoning reservoir structure according to claim 1, characterized in that: A maintenance ladder (9) is provided on one side of the sedimentation tank (6).

3. A construction method for a pumped storage power station reservoir basin flood inverted siphoning reservoir structure, characterized in that: The following steps are involved: S1. During the construction of the reservoir basin, the inverted siphon suction reservoir structure is constructed simultaneously; S2. Excavate the exit first, and then excavate a bottom flat tunnel from the reservoir basin. Use the bottom flat tunnel as a slag discharge channel, and then excavate the vertical shaft section; S3. Support the excavation working surface, and ensure that the supporting working surface is closely aligned with the excavation working surface; S4. After excavation and support are completed, concrete pouring operation is carried out; S5. After the concrete pouring is completed, the metal structure of the inverted siphon suction reservoir is installed; S6. Carry out anti-seepage treatment on the connection parts between the inlet control device and the water supply and drainage ditch around the reservoir, as well as the outlet entering the reservoir.

4. The construction method of the pumped storage power station reservoir basin flood inverted siphoning reservoir structure according to claim 3, characterized in that: The vertical shaft section in step S2 is selected and arranged on the thick watershed rock mass around the reservoir.

5. The construction method of the pumped storage power station reservoir basin flood inverted siphoning reservoir structure according to claim 3, characterized in that: The excavation of the vertical shaft section adopts the raise boring method.

6. The construction method of the pumped storage power station reservoir basin flood inverted siphon structure according to claim 3, characterized in that: The support measure adopts anchor spraying support.

7. The construction method of the pumped storage power station reservoir basin flood inverted siphon structure according to claim 3, characterized in that: The lining concrete of the shaft is hoisted by prefabricated concrete pipes or cast-in-situ concrete lining.

8. The construction method of the pumped storage power station reservoir basin flood inverted siphoning reservoir structure according to claim 7, characterized in that: The concrete lining construction adopts the slipform cast-in-place method from top to bottom, and the concrete lining construction of this section is carried out after a section is excavated.

9. The construction method of the pumped storage power station reservoir basin flood inverted siphoning reservoir structure according to claim 3, characterized in that: The metal structure comprises a trash rack (8) and an inspection ladder (9).

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