Flood discharge, sediment discharge and water supplement structure for pumped storage power station project

Abstract

The invention discloses a flood discharge, desilting and water replenishing structure for pumped storage power station engineering in the technical field of water conservancy and hydropower engineering, which comprises a reservoir basin, the reservoir basin is provided with a desilting and water replenishing building body, the bottom of the desilting and water replenishing building body is provided with a channel capable of being controlled to open and close, and the two ends of the channel are provided with openings. The two openings are formed in the two sides of the sand blocking and water supplementing building body in the upstream and downstream direction correspondingly. The flood discharge and sediment discharge gallery is arranged on one side of the downstream of the sand blocking and water replenishing building body and communicates with the opening in the downstream side of the sand blocking and water replenishing building body; flood discharging, sand discharging and water supplementing are jointly arranged to be of an integral structure, the flood discharging and sand discharging gallery is arranged at the bottom of the reservoir basin of the pumped storage power station, the problem that a flood discharging and sand discharging building is limited by topography and geology is solved, the construction difficulty is lowered, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water conservancy and hydropower engineering, and particularly relates to a flood discharge and sand discharge and water supplement structure for a pumped storage power station project. BACKGROUND

[0002] It is common to set a pumped storage reservoir basin in a natural river channel in a mountainous area. One existing technology is to arrange a flood discharge and sand discharge tunnel in a mountain body on a bank to guide the water with much sediment in the natural river channel to the downstream of the reservoir basin. This technology has the following shortcomings: the flood discharge and sand discharge tunnel needs to be excavated in the mountain body, the underground tunnel excavation and support engineering is large, the tunnel axis is usually limited by the topography and geological conditions and needs to be turned, the flood discharge and sand discharge channel is not smooth, the water flow state is poor, the design is difficult, the engineering investment is high, the risk of tunnel siltation during operation is high, and the maintenance is difficult. Another technology is to guide the water upstream of the reservoir basin to a nearby other river channel through a water diversion tunnel. This technology is also limited by the topography and geological conditions and needs to be arranged near a suitable flood discharge and sand discharge river channel. In addition, this technology changes the runoff structure of the natural river channel, increases the flood flow of the nearby river channel, changes the water balance of the original river channel and the nearby river channel, and needs to take another measure to solve the problems of flood control, sediment, ecology, etc. of the original river channel and the nearby river channel. SUMMARY

[0003] To overcome the shortcomings of the prior art, the present application solves the technical problem of how to improve the large construction difficulty and high cost of the flood discharge and sand discharge tunnel of the existing natural river channel pumped storage project.

[0004] The technical scheme adopted by the present application to solve the technical problem is: The flood discharge and sand discharge and water supplement structure for a pumped storage power station project comprises a reservoir basin, the reservoir basin is provided with a sand blocking and water supplement building body, the bottom of the sand blocking and water supplement building body is provided with a passageway which can be controlled to be opened and closed, two ends of the passageway are provided with openings, and the two openings are respectively arranged on the two sides of the sand blocking and water supplement building body in the upstream and downstream directions; the structure further comprises a flood discharge and sand discharge corridor arranged on one side of the downstream of the sand blocking and water supplement building body, the flood discharge and sand discharge corridor is connected to the opening on the downstream side of the sand blocking and water supplement building body; the flood discharge and sand discharge corridor is arranged at the bottom of the reservoir basin; the sand blocking and water supplement building body comprises a water supplement dam section, a flood discharge and sand flushing dam section and a water retaining dam section which are sequentially and continuously arranged along the vertical water flow direction; the top of the water supplement dam section is provided with an overflow weir; and the passageway is arranged at the bottom position of the flood discharge and sand flushing dam section.

[0005] Further, the water supplement dam comprises a first dam body with a triangular cross section, the overflow weir comprises a water supplement opening on the upper part of the first dam body, and the water supplement opening is sealingly provided with a water supplement gate plate.

[0006] Further, the flood discharge and sand flushing dam section comprises a second dam body, the second dam body is provided with a trapezoidal cross section, and the passageway is horizontally arranged and vertically penetrates the bottom of the second dam body.

[0007] Further, the water retaining dam section comprises a third dam body with a triangular cross section.

[0008] Further, the flood discharge and sediment discharge gallery extends linearly along the downstream direction of the sand retaining and water supplementing building body.

[0009] Further, the flood discharge and sediment discharge gallery is provided with a cover heavy stone residue layer on the top.

[0010] Further, the flood discharge and sediment discharge gallery is provided with an anchor cable on the bottom.

[0011] Further, the flood discharge and sediment discharge gallery is provided with an anchor cable on the bottom.

[0012] The beneficial effects of the present application are: By combining the flood discharge, sediment discharge and water supplementing in an integrated structure, the function requirements of the pumped storage power station for flood discharge and sediment discharge can be met, and the upstream river water level can be raised to realize self-flow water supplementing by controlling the flood discharge and sediment discharge gate and the water supplementing flap gate. Meanwhile, the flood discharge and sediment discharge gallery is arranged at the lower part of the reservoir basin, and the flood discharge and sediment discharge channel is arranged in a straight line by using the open pouring gallery, so that the problem of the axis of the flood discharge and sediment discharge tunnel being limited by the reservoir bank mountain in the prior art can be solved, the flood discharge and sediment discharge building can be improved, the construction difficulty can be reduced, the construction period can be shortened, and the engineering fund investment can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram of the three-dimensional structure of the present application Figure 1 ; Figure 2 is a schematic diagram of the three-dimensional structure of the present application Figure 2 ; Figure 3 is a schematic diagram of the water supplementing dam section of the present application; Figure 4 is a schematic diagram of the flood discharge and sediment discharge dam section of the present application; Figure 5 is a schematic diagram of the water retaining dam section of the present application; In the figure, 1 is the water supplementing dam section, 2 is the flood discharge and sediment discharge dam section, 3 is the water retaining dam section, 4 is the flood discharge and sediment discharge gallery, 5 is the cover heavy stone residue layer, 6 is the water supplementing gate plate, and 7 is the opening. DETAILED DESCRIPTION

[0014] The present application will be further described below in combination with the drawings.

[0015] As Figures 1-5As shown, the embodiment of the present application proposes a flood discharge and sand discharge and water replenishment structure for pumped storage power station project, which comprises a reservoir basin, the reservoir basin is provided with a sand blocking and water replenishment building body, the submerged range below the dead water level of the reservoir basin, which is equivalent to the submerged area from the reservoir bottom to the bottom plate of the water release gate; the bottom of the sand blocking and water replenishment building body is provided with a passageway which can be controlled to open and close, two ends of the passageway are provided with openings 7, and the two openings 7 are respectively arranged on the two sides of the sand blocking and water replenishment building body in the upstream and downstream directions; further comprising a flood discharge and sand discharge gallery 4 arranged on the downstream side of the sand blocking and water replenishment building body, the flood discharge and sand discharge gallery 4 is connected with the opening 7 on the downstream side of the sand blocking and water replenishment building body; the sand blocking and water replenishment building body comprises a water replenishment dam section 1, a flood discharge and sand discharge dam section 2 and a water retaining dam section 3 which are sequentially and continuously arranged along the vertical water flow direction; the passageway is arranged at the bottom position of the flood discharge and sand discharge dam section 2.

[0016] First of all, it needs to be pointed out that by arranging the flood discharge, sand discharge and water replenishment in an integrated structure, not only can the function requirements of the pumped storage power station for flood discharge and sand discharge be met, but also by controlling the flood discharge and sand discharge gate and the water replenishment flap gate, the upstream river water level can be raised to achieve self-flowing water replenishment; at the same time, it is proposed that the flood discharge and sand discharge gallery 4 is arranged at the bottom position of the reservoir basin, that is, it is embedded in the lower part of the reservoir basin, and the flood discharge and sand discharge gallery 4 is arranged in a straight line by using the way of pouring a gallery, which can improve the problem that the axis of the existing technology flood discharge and sand discharge tunnel is limited by the reservoir bank mountain, can improve the poor flood discharge flow state, reduce the construction difficulty, reduce the construction period and save the engineering investment.

[0017] The sand blocking and water replenishment building body is arranged on the upstream of the reservoir basin riverway of the pumped storage power station, which can block the upstream water when the riverway has high sediment concentration, and at the same time, it can let the water outside the reservoir flow over the dam into the reservoir to replenish the reservoir when the natural riverway has low sediment concentration. The water retaining dam section 3 can adopt a conventional water retaining dam; the flood discharge and sand discharge dam section 2 is additionally provided with a passageway at the bottom, that is, the bottom flood discharge and sand discharge gallery 4 inlet, the flood discharge and sand discharge gallery 4 inlet is the opening 7 on the upstream side of the flood discharge and sand discharge dam section 2, which is provided with a working gate, and the passageway is opened and closed by controlling the gate, that is, the upstream water level is controlled, when the gate is opened, the upstream water can flow down through the opening 7, and when the gate is closed, the upstream water level is raised until the upstream water flows over the dam into the reservoir; when the natural riverway has high sediment concentration, the sand is discharged through the bottom hole, and when the riverway has low sediment concentration, the reservoir is replenished by the overflow weir.

[0018] The flood discharge and sand discharge dam section serves as a water discharge passageway, which is a control gate for adjusting the upstream water level to achieve self-flowing water replenishment, and also provides a suitable inlet for the reservoir bottom flood discharge and sand discharge gallery 4.

[0019] The water replenishment structure of the water replenishment dam section 1 can be an overflow weir arranged on the dam top, and the weir top elevation is lower than the water retaining dam and the flood discharge and sand discharge dam, after the flood discharge and sand discharge gate is closed, the upstream water level is raised to the weir top elevation, at this time, the pumped storage reservoir can achieve self-flowing water replenishment.

[0020] Specifically, the water supplement dam includes a first dam body in triangular cross section, a water supplement opening is arranged at the upper portion of the first dam body, a water supplement gate 6 is sealingly arranged at the water supplement opening, water supplement into the reservoir is realized by controlling the opening and closing of the water supplement gate 6, the weir top elevation is reduced, and water supplement is facilitated when the water level in the reservoir is low; the flood discharge and sand flushing dam section 2 includes a second dam body, the second dam body is arranged in trapezoidal cross section, and the channel is horizontally arranged and vertically penetrates the bottom of the second dam body, the water retaining dam section 3 includes a third dam body in triangular cross section; the triangular dam body and the trapezoidal dam body both have the advantage of high stability.

[0021] The flood discharge and sand flushing dam section is connected with a flood discharge and sand flushing gallery 4 downstream, the flood discharge and sand flushing gallery 4 is embedded in the lower portion of the reservoir basin, the traditional reservoir bank flood discharge and sand flushing tunnel is straightened, the flood discharge and sand flushing gallery 4 is embedded below the dead water level of the reservoir bottom, a downward-penetrating channel is formed in the reservoir basin, the downward-penetrating gallery of the reservoir basin is adopted, the traditional reservoir bank tunnel is straightened, and the geological adaptability of the flood discharge and sand flushing structure of the pumped storage power station is improved.

[0022] Specifically, the flood discharge and sand flushing gallery 4 is horizontally arranged and linearly extends along the downstream direction of the sand blocking and water supplement building body; the cross section of the flood discharge and sand flushing gallery 4 can be circular or polygonal, and is rectangular in the embodiment, facilitating construction.

[0023] The top of the flood discharge and sand flushing gallery 4 is covered with a cover heavy stone residue layer 5 with a preset thickness, and the bottom of the flood discharge and sand flushing gallery 4 is provided with an anchor cable; that is, in order to satisfy the anti-floating stability of the flood discharge and sand flushing gallery 4, a cover heavy backfill stone residue layer is arranged at the top of the gallery, the cover heavy stone residue elevation does not exceed the dead water level, and when the cover heavy does not satisfy the anti-floating stability of the gallery, an anchor cable can be arranged at the bottom of the gallery, and the anchor cable realizes the fixation of the bottom of the flood discharge and sand flushing gallery 4.

[0024] In summary, the flood discharge and sand flushing and water supplement structure for the pumped storage power station engineering is proposed, compared with the existing pumped storage power station flood discharge and sand flushing technology of the river channel with much sediment, not only can the functional requirements of the power station on the flood discharge and sand flushing structure be satisfied, but also the flood discharge and sand flushing structure is not restricted by the reservoir bank mountain, the underground chamber excavation is reduced, the flood discharge and sand flushing flow state is improved, the construction period is saved, and the engineering investment is reduced.

Claims

1. A flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects, characterized in that, The system includes a reservoir basin, which is equipped with a sediment-trapping and water-replenishing structure. The bottom of the sediment-trapping and water-replenishing structure is provided with a controllable opening and closing channel. The channel has openings (7) at both ends, and the two openings (7) are respectively located on both sides of the sediment-trapping and water-replenishing structure in the upstream and downstream directions. The system also includes a flood discharge and sediment flushing corridor (4) located on the downstream side of the sediment-trapping and water-replenishing structure. The flood discharge and sediment flushing corridor (4) is connected to the openings (7) on the downstream side of the sediment-trapping and water-replenishing structure. The flood discharge and sediment flushing corridor is located at the bottom of the reservoir basin. The water replenishment and sand control structure includes a water replenishment dam section (1), a flood discharge and sand flushing dam section (2), and a water retaining dam section (3) that are connected in sequence along the vertical water flow direction; the top of the water replenishment dam section is provided with an overflow weir; the channel is located at the bottom of the flood discharge and sand flushing dam section (2).

2. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The water replenishment dam includes a first dam body with a triangular cross-section, and the overflow weir includes a water replenishment port at the upper part of the first dam body. The water replenishment port is sealed with a water replenishment gate (6).

3. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The flood discharge and sand flushing dam section (2) includes a second dam body, the second dam body has a trapezoidal cross section, and the channel is horizontally arranged and vertically penetrates the bottom of the second dam body.

4. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The water-retaining dam section (3) includes a third dam body with a triangular cross-section.

5. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The flood discharge and sediment flushing corridor (4) extends in a straight line downstream of the sediment interception and water replenishment structure.

6. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The cross-section of the flood discharge and sediment flushing corridor (4) is rectangular.

7. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 1, characterized in that, The top of the flood discharge and sediment discharge corridor (4) is covered with a pre-set thickness of heavy stone slag layer (5).

8. The flood discharge, sediment flushing, and water replenishment structure for pumped storage power station projects according to claim 7, characterized in that, Anchor cables are installed at the bottom of the flood discharge and sediment flushing corridor (4).

Images