Hydropower station drainage structure combining drainage hole and vertical shaft type spillway

Abstract

The utility model relates to a hydropower station drainage structure combining a drainage hole and a vertical shaft type spillway, which is provided with a vertical shaft arranged in a reservoir on the upstream side of a hydropower station, the bottom of the vertical shaft is connected with a water recession hole, and the outlet end of the water recession hole is located at the downstream position of the hydropower station; the inlet end of the drainage hole is arranged in a reservoir on the upstream side of the hydropower station, the outlet end of the drainage hole is connected to the water recession hole, and an energy dissipation structure is arranged in the drainage hole; the energy dissipation structure is provided with a hole plug structure and a pressure slope structure which are arranged in the discharge hole. Therefore, the downstream side hole section of the emergency gate shaft of the discharge hole can be connected to the water recession hole of the vertical shaft type flood discharge channel, and an outlet of the discharge hole can be omitted, so that the construction and the engineering amount of the discharge hole are greatly reduced, and the construction cost is saved; through the hole plug structure and the pressure slope structure which are arranged in the drainage hole, the hole plug structure and the pressure slope structure are simple in structure, pressure water flow flowing into the drainage hole is converted into non-pressure water flow, and the good energy dissipation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a water release structure of spillway combined with a discharge hole and a vertical shaft spillway of a hydropower station. BACKGROUND

[0002] A hydropower station is a building in which a dam is arranged on a river channel so that a large water level difference exists between the upstream and downstream sides of the dam, and when water in a reservoir on the upstream side of the dam flows to the downstream side of the dam, the water drives the operation of power generation equipment in the dam to generate electricity. The water storage capacity of the reservoir on the upstream side of the dam is affected by factors such as weather and power station operation, and the water storage capacity and water level of the reservoir may exceed the bearing value at the time of construction of the hydropower station. It is necessary to discharge the excess water storage in the reservoir on the upstream side of the hydropower station.

[0003] At present, in a hydropower station, a discharge hole and a vertical shaft spillway are often used to discharge the water storage in the reservoir on the upstream side of the hydropower station. The inlet end of the discharge hole is arranged at a position below the dead water level in the reservoir, so that the discharge hole is a pressurized tunnel when it is in operation; after energy dissipation through the vertical shaft, the return tunnel of the vertical shaft spillway is a non-pressurized tunnel. The lining structure and grouting of the return tunnel of the vertical shaft spillway are designed according to a non-pressurized tunnel. At present, the discharge hole and the vertical shaft spillway are generally considered separately, and the discharge hole and the vertical shaft spillway need to consider separate exit openings, which is large in engineering quantity and investment; if the discharge hole and the vertical shaft spillway are combined, the pressurized water flow in the discharge hole will change the stress mode in the combined section of the discharge hole and the vertical shaft spillway, and the lining structure and grouting scheme of the combined section of the discharge hole and the vertical shaft spillway need to be adjusted accordingly. SUMMARY

[0004] The technical problem to be solved by the utility model is: to solve the above technical problems, the utility model provides a water release structure of a hydropower station combined with a discharge hole and a vertical shaft spillway.

[0005] The technical scheme employed by the utility model is: a water release structure of a hydropower station combined with a discharge hole and a vertical shaft spillway, comprising:

[0006] The vertical shaft spillway has a vertical shaft arranged in the reservoir on the upstream side of the hydropower station, and the vertical shaft is connected with a return tunnel at the bottom, and the outlet end of the return tunnel is located at the downstream side of the hydropower station;

[0007] The discharge hole has an inlet end arranged in the reservoir on the upstream side of the hydropower station, and an outlet end connected with the return tunnel, and an energy dissipation structure arranged in the discharge hole;

[0008] The energy dissipation structure has a hole plug structure and a pressure slope structure arranged in the discharge hole.

[0009] At least two hole plug structures are arranged in the discharge hole, and the number of the hole plug structures can be arranged according to the energy dissipation requirement.

[0010] The hole plug structure is a concrete structure cast on the inner wall of the discharge hole, and a water flow passage is arranged on the hole plug structure.

[0011] The pressure slope structure is a concrete structure cast on the inner wall of the discharge hole, and the pressure slope structure is arranged at the top of the discharge hole chamber, and the water-approaching end of the pressure slope structure is arc-shaped.

[0012] The utility model discloses a kind of energy dissipation structures of vertical shaft spillway, comprising discharge hole, vertical shaft, emergency gate well and water return tunnel, discharge hole is connected to the water return tunnel of vertical shaft spillway, and the energy dissipation structure is arranged in discharge hole. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The plane structure schematic diagram of the utility model.

[0014] Figure 2 The vertical structure schematic diagram of the utility model in water release hole.

[0015] In the drawing: 1, discharge hole; 2, vertical shaft; 3, emergency gate well; 4, water return tunnel; 5, water return tunnel combination tunnel section; 6, hole plug structure; 7, pressure slope structure; 8, water return tunnel outlet. DETAILED DESCRIPTION

[0016] The utility model will be further explained in detail below in combination with the drawings and through examples. The following examples are an explanation of the utility model, but the utility model is not limited to the following examples.

[0017] The embodiment is a water discharge structure of a hydropower station combining a discharge hole with a vertical shaft spillway. The hydropower station is arranged on a river channel. The upstream of the hydropower station is stored with water and forms a reservoir.

[0018] In the embodiment, a vertical shaft spillway is arranged in the river channel. A vertical shaft 2 is arranged in the reservoir on the upstream side of the hydropower station. A discharge hole 4 is connected to the bottom of the vertical shaft 2. The discharge hole outlet 8 of the discharge hole 4 is located at the downstream of the hydropower station. In this way, when the water level in the reservoir is higher than the top end of the vertical shaft 2, the excess water in the reservoir will flow into the discharge hole 4 through the vertical shaft 2 and be finally discharged to the downstream side of the hydropower station, realizing the discharge of the excess water in the reservoir. The discharge hole 4 is a non-pressure flow in the process of water discharge of the vertical shaft spillway, and the flow has a small scouring effect on the vertical shaft spillway.

[0019] In the embodiment, a discharge hole 1 is further arranged on the hydropower station. The inlet end of the discharge hole 1 is arranged at a position below the water level in the reservoir. An emergency gate is arranged at the upstream hole section of the discharge hole 1. In this way, the emergency gate needs to be opened in the process of water discharge or emptying of the discharge hole 1. At this time, the flow flows into the discharge hole 1 under the water pressure in the reservoir. The flow flowing into the discharge hole 1 is a pressure flow. The discharge hole 1 needs to be designed in structure and grouting according to the pressure tunnel.

[0020] In the embodiment, the outlet end of the discharge hole 1 is connected to the discharge hole 4. This greatly shortens the construction length of the discharge hole 1 and can not set the discharge hole opening, saving the construction cost. The downstream hole section of the discharge hole 4 at the position connected to the discharge hole 1 is a discharge hole combination hole section 5. The water discharged from the discharge hole 1 flows into the discharge hole combination hole section 5 and is finally discharged from the discharge hole outlet 8.

[0021] In the embodiment, the combination arrangement mode of the discharge hole and the vertical shaft spillway does not change the design scheme of the non-pressure tunnel of the discharge hole. The two holes are truly combined, the tunnel length of the discharge hole is reduced, and the outlet of the discharge hole is cancelled.

[0022] In the embodiment, the hole plug structure 6 and the pressure slope structure 7 are arranged on the inner wall of the flat section behind the accident maintenance gate of the discharge hole 1 during the construction of the discharge hole 1. The number of the hole plug structure 6 is two or more, which can be set according to the energy dissipation requirement. The number of the pressure slope structure 7 is one, which is arranged on the downstream side of the hole plug structure 6. In this way, the hole plug structure 6 relies on the sudden contraction and sudden expansion of the water flow to dissipate the energy of the water flow. The pressure slope structure 7 adjusts the flow pattern of the water flow by the top pressure slope, so that the pressurized water flow becomes non-pressurized water flow after passing through the energy dissipation structure. The non-pressurized water flow is weakly eroded to the structure hole section 5 of the water outlet hole 4 when flowing from the outlet of the discharge hole 1 into the water outlet hole 4. The hole plug structure 6 and the pressure slope structure 7 are simple in structure and can save construction cost.

[0023] In the embodiment, the hole plug structure 6 and the pressure slope structure 7 are both formed by pouring concrete on the inner wall of the discharge hole 1 during the construction of the discharge hole 1. The hole plug structure 6 is a concrete structure poured on the inner wall of the discharge hole 1, and a water flow passage is arranged on the hole plug structure 6. The pressure slope structure 7 is a concrete structure poured on the inner wall of the discharge hole 1, and the pressure slope structure 7 is arranged at the top position of the discharge hole 1. The water-approaching end of the pressure slope structure 7 is arc-shaped, and the top pressure slope adjusts the flow pattern of the water flow.

[0024] In the embodiment, the accident maintenance gate well 3 is arranged at the position of the accident maintenance gate in the discharge hole 1. In this way, personnel can enter the accident maintenance gate well 3 to operate the accident maintenance gate, and the water flow in the discharge hole 1 can be discharged.

[0025] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A water discharge structure of a hydropower station combining a release hole with a shaft spillway, characterized in that: the shaft spillway has a shaft (2) arranged in a reservoir on an upstream side of the hydropower station, and a release hole (4) connected to a bottom of the shaft (2), with an outlet end of the release hole (4) located at a downstream side of the hydropower station; the release hole (1) has an inlet end arranged in the reservoir on the upstream side of the hydropower station, and an outlet end connected to the release hole (4), and an energy dissipation structure arranged in the release hole (1); the energy dissipation structure has a plug structure (6) and a pressure slope structure (7) arranged in the release hole (1). An accident inspection gate shaft (3) is arranged on an upstream side of the energy dissipation structure of the release hole (1). The plug structure (6) is a concrete structure cast on an inner wall of the release hole (1), and a water flow passage is arranged on the plug structure (6). The pressure slope structure (7) is a concrete structure cast on the inner wall of the release hole (1), and is arranged at a top position of a chamber of the release hole (1), with a water-impinging end of the pressure slope structure (7) processed as a curved surface.

2. The hydropower plant discharge structure combining a spillway with a shaft spillway according to claim 1, characterized in that: At least two plug structures (6) are arranged in the release hole (1), and the pressure slope structure (7) is arranged on a downstream side of the plug structures (6).

3. The hydropower plant discharge structure combining a spillway with a shaft spillway according to claim 1, characterized in that: ​ 4. The hydropower plant discharge structure combining a spillway with a shaft spillway according to claim 1, characterized in that: ​ 5. The hydropower plant discharge structure incorporating a relief hole with a shaft spillway according to claim 1, characterized in that: ​

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