A dam-back type power plant combined with a power house fishway

Abstract

The application provides a dam-back type power plant hydropower station with combined construction of a fishway and a power plant, comprising a dam and a power plant, the dam comprises a first water retaining dam section and a second water retaining dam section, the power plant is arranged on a power intake dam section close to the first water retaining dam section, a power intake dam section, a bottom outlet dam section and an overflow dam section are sequentially arranged between the first water retaining dam section and the second water retaining dam section, a fishway is arranged on one side of the hydropower station, a plurality of fishway inlets are arranged on the downstream of the hydropower station, a fishway outlet is arranged on the upstream of the hydropower station, the fishway further comprises a middle guide wall fishway, a through-power-plant fishway and a bank spiral fishway, a thin wall is arranged on the overhanging bracket on the downstream side of the tail water retaining wall of the power plant, the through-power-plant fishway takes the tail water retaining wall of the power plant as the upstream side wall body, takes the thin wall arranged on the overhanging bracket as the downstream side wall body, and the overhanging bracket forms a U-shaped space with the bottom plate. The through-power-plant fishway can be cast and constructed together with the main structure of the power plant, thereby saving the construction period, equivalent to the traditional structure, saving the investment and reducing the engineering quantity.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering, specifically to a dam-type hydropower station with a fish passage connecting the powerhouse and the powerhouse. Background Technology

[0002] When a river channel is blocked by a water-retaining structure, a fishway provides a migration route for certain fish species that migrate from the lower reaches of the river to the upper reaches to spawn. Water flows into the fishway from the reservoir upstream of the water-retaining structure and out of the fishway from the river channel downstream of the water-retaining structure. The migratory fish enter the fishway from the lower reaches and swim out of the fishway from the upper reaches. Therefore, the lower outlet is called the fishway inlet, and the upper inlet is called the fishway outlet.

[0003] A typical hydroelectric power station dam with a downstream powerhouse generally includes left and right bank water-retaining dam sections, spillway sections, sand-flushing bottom outlet dam sections, and powerhouse-inlet dam sections. The powerhouse is located downstream of the powerhouse-inlet dam section. The downstream side of the spillway section is the flood discharge and energy dissipation area, which is separated from the powerhouse tailrace area by a guide wall between the powerhouse and the dam. The water flow velocity in the powerhouse tailrace area is relatively slow, and the fishway inlet is generally located in the tailrace area downstream of the powerhouse.

[0004] Although the fishway through the factory building avoids the impact of the factory's tailwater outflow as much as possible, it is greatly affected by the fluctuation of the tailwater level downstream of the factory building. As it is a separate and independent structure from the factory building, the amount of work is relatively large, the overall structure of the hub is not compact enough, and the construction of the fishway often lags behind that of the factory building, requiring the construction of additional scaffolding and formwork for pouring later, making the construction relatively complicated. Summary of the Invention

[0005] The main objective of this invention is to provide a dam-type hydroelectric power station with a fishway connecting the powerhouse and the powerhouse, which is constructed in conjunction with the powerhouse construction, and is expected to effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dam-type hydroelectric power station with a powerhouse and a fishway integrated into the powerhouse construction includes a dam and a powerhouse. The dam comprises a first dam section, a second dam section, a powerhouse intake dam section, a bottom outlet dam section, and a spillway dam section. The powerhouse is located on the intake dam section near the first dam section. The powerhouse has a tailrace retaining wall, and an outward-facing bracket is located on the downstream side of the tailrace retaining wall. Between the first and second dam sections, the intake dam section, the bottom outlet dam section, and the spillway dam section are sequentially arranged. A fishway is located on one side of the hydroelectric power station. The hydropower station has multiple fishway inlets downstream and fishway outlets upstream. The fishway also includes a guide wall fishway, a powerhouse fishway, and a shore-side spiral fishway. The guide wall fishway and the powerhouse fishway, as well as the powerhouse fishway and the shore-side spiral fishway, are connected by corner passages. A thin wall is provided on the cantilevered bracket on the downstream side of the powerhouse tailrace retaining wall. The powerhouse fishway uses the powerhouse tailrace retaining wall as its upstream wall and the thin wall on the cantilevered bracket as its downstream wall. The cantilevered bracket forms a U-shaped space as the fishway floor.

[0008] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0009] As a preferred technical solution of the present invention: multiple fishway inlets are respectively located downstream of the fishway in the central guide wall and upstream and downstream of the fishway on the shore.

[0010] As a preferred technical solution of the present invention: a crossbeam is provided between the tailwater retaining wall and the thin wall of the plant.

[0011] As a preferred technical solution of the present invention: a steel grating cover is provided on the top surface of the fish passage through the factory building.

[0012] As a preferred technical solution of the present invention: a ladder maintenance passage is provided inside the fish passage of the factory building.

[0013] This invention provides a dam-type hydropower station with a fishway connecting to the powerhouse and the powerhouse, which has the following advantages: Similar to the downstream auxiliary powerhouse layout of a dam-type powerhouse, the fishway is arranged using the space above the tailrace diffuser section, resulting in a compact layout and avoiding interference from the tailrace outflow on the fishway structure; the fishway opening size is relatively small compared to the overall size of the gate piers, making its impact on structural safety controllable and reliable; the fishway can be poured and constructed together with the main powerhouse structure, saving construction time, and is equivalent to a traditional structure with less engineering work and reduced investment. Attached Figure Description

[0014] Figure 1 A plan view of a dam-type hydroelectric power station with a combined powerhouse and fishway for the construction of the powerhouse, provided by the present invention.

[0015] Figure 2A floor plan of the fish passageway through the factory building;

[0016] Figure 3 A cross-sectional view of the fish passage through the factory building;

[0017] In the diagram: 1-First dam section; 2-Second dam section; 3-Power plant intake dam section; 4-Bottom outlet dam section; 5-Overflow dam section; 6-Powerhouse; 7-Fishway; 8-Powerhouse tailrace retaining wall; 9-Thin wall; 10-Outward cantilever bracket; 11-Crossbeam; 12-Steel grating cover plate; 13-Powerhouse tailrace gate pier; 71-Fishway inlet; 72-Fishway outlet; 73-Central guide wall fishway; 74-Fishway through the powerhouse; 75-Shoreside spiral fishway; 76-Corner passage. Detailed Implementation

[0018] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-3 As shown, a dam-type hydroelectric power station with a combined powerhouse and fishway construction includes a dam and a powerhouse 6. The dam includes a first dam section 1, a second dam section 2, a powerhouse intake dam section 3, a bottom outlet dam section 4, and a spillway dam section 5. In this embodiment, the first dam section 1 is the left bank dam section, and the second dam section 2 is the right bank dam section. The powerhouse 6 is located on the powerhouse intake dam section 3 near the first dam section 1. The powerhouse 6 has a tailrace retaining wall 8, and an outward-facing bracket 10 is provided on the downstream side of the tailrace retaining wall 8. The powerhouse intake dam section 3, the bottom outlet dam section 4, and the spillway dam section 5 are arranged sequentially between the first dam section 1 and the second dam section 2. A fishway 7 is provided on one side of the hydropower station. The fishway 7 has multiple fishway inlets 71 downstream of the hydropower station and a fishway outlet 72 upstream of the hydropower station. The fishway 7 also includes a guide wall fishway 73, a powerhouse fishway 74, and a shore-side spiral fishway 75. The guide wall fishway 73 and the powerhouse fishway 74, and the powerhouse fishway 74 and the shore-side spiral fishway 75 are connected by a corner passage 76. A thin wall 9 is provided on the cantilevered bracket 10 on the downstream side of the powerhouse tailrace retaining wall 8. The powerhouse fishway 74 uses the powerhouse tailrace retaining wall 8 as the upstream side wall and the thin wall 9 set on the cantilevered bracket 10 as the downstream side wall. The cantilevered bracket 10 forms a U-shaped space as the fishway bottom plate.

[0020] Multiple fishway inlets 71 are located downstream of the central guide wall fishway 73 and upstream and downstream of the shore-side spiral fishway 75, respectively.

[0021] A crossbeam 11 is provided between the tailwater retaining wall 8 and the thin wall 9 of the factory building.

[0022] A steel grating cover plate 12 is installed on the top surface of the fish passage 74 through the factory building. The steel grating can provide lighting for the fish passage below. A ladder maintenance passage is installed inside the fish passage 74 through the factory building.

[0023] The corner passage 76 is set inside the large-volume concrete of the gate pier in the side unit section and the installation section on the shore, and is connected to the shore spiral fishway 75 and the middle guide wall fishway 73.

[0024] By utilizing the internal space of the tailwater gate pier at the outlet section of the tailwater pipe of the plant, a water-stopping device is installed at the opening of the gate pier to separate the fish passage from the tailwater of the plant.

[0025] Specifically, the aforementioned dam-type hydropower station with a fishway connecting the powerhouse and the powerhouse is constructed in conjunction with the powerhouse construction, and is implemented in the following manner:

[0026] S1. Based on the overall design of the fishway and in combination with the factory structure, determine the location of the opening of the fishway 74 through the factory in the solid concrete of the tailrace gate pier 13 and the overall slope.

[0027] S2. Based on the fishway elevation, a cantilevered bracket 10 is built on the downstream side of the tailwater retaining wall 8 of the plant as the fishway base plate.

[0028] S3. Based on the tailwater level of the plant, the structure and reinforcement design of the thin wall 9 on the downstream side of the fishway are carried out, and a crossbeam 11 is installed between it and the tailwater retaining wall 8 of the plant as a support.

[0029] S4. The gate pier opening is located at the structural joint between the units and is combined with the overall water-stopping arrangement of the plant to isolate the water flow in the fish passage from the tailwater of the plant.

[0030] S5. The thin wall 9 on the downstream side of the fishway rises to the elevation of the tailwater platform of the plant. The opening between the wall and the tailwater retaining wall 9 of the plant is sealed with a steel grating cover 12. The steel grating cover 12 can provide a light passage for the lower fishway. If necessary, a ladder maintenance passage from the tailwater platform to the fishway can be set in this opening.

[0031] The above specific embodiments are used to explain and illustrate the present invention, and are only preferred embodiments of the present invention, not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A dam-type hydropower station with a powerhouse and a fishway constructed together, comprising a dam and a powerhouse (6), wherein the dam comprises a first dam section (1), a second dam section (2), a powerhouse intake dam section (3), a bottom outlet dam section (4), and an overflow dam section (5), the powerhouse (6) being located on the powerhouse intake dam section (3) near the first dam section (1), the powerhouse (6) having a tailrace retaining wall (8), and an outward-facing bracket (10) on the downstream side of the tailrace retaining wall (8); the powerhouse intake dam section (3), the bottom outlet dam section (4), and the overflow dam section (5) are arranged sequentially between the first dam section (1) and the second dam section (2), a fishway (7) is provided on one side of the hydropower station, the fishway (7) having multiple fishway inlets (71) downstream of the hydropower station, and the fishway (7) having a fishway outlet (72) upstream of the hydropower station, characterized in that: The fishway (7) also includes a central guide wall fishway (73), a factory passage fishway (74), and a shore-side spiral fishway (75). The central guide wall fishway (73) and the factory passage fishway (74), and the factory passage fishway (74) and the shore-side spiral fishway (75) are connected by a corner passage (76). A thin wall (9) is provided on the cantilevered bracket (10) on the downstream side of the factory tailwater retaining wall (8). The factory passage fishway (74) takes the factory tailwater retaining wall (8) as the upstream side wall and the thin wall (9) set on the cantilevered bracket (10) as the downstream side wall. The cantilevered bracket (10) forms a U-shaped space as the bottom plate of the fishway.

2. The dam-type powerhouse hydropower station with fish passage and powerhouse construction combined as described in claim 1, characterized in that: Multiple fishway inlets (71) are located downstream of the central guide wall fishway (73) and upstream and downstream of the shore-side spiral fishway (75).

3. The dam-type powerhouse hydropower station with fish passage and powerhouse construction combined as described in claim 1, characterized in that: A crossbeam (11) is provided between the tailwater retaining wall (8) and the thin wall (9) of the plant.

4. The dam-type powerhouse hydropower station with fish passage and powerhouse construction combined as described in claim 1, characterized in that: The top surface of the fish passage (74) through the factory building is provided with a steel grating cover plate (12).

5. The downstream powerhouse hydropower station constructed in conjunction with the powerhouse and fishway as described in claim 1 or 4, characterized in that: A ladder maintenance passage is provided inside the fish passage (74) of the factory building.

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