Water pumping and draining system for drainage maintenance of underflow stilling pool of hydropower station

Abstract

A water pumping and draining system used for drainage maintenance of an underflow stilling pool of a hydropower station comprises a drainage pumping station, the drainage pumping station is located on the water surface in the stilling pool body, a water outlet pipe of the drainage pumping station is connected with a metal hose, and the metal hose is arranged along the water surface in the stilling pool body, passes through the top face of a tail sill at one end of the stilling pool body and extends out of the stilling pool body. By the adoption of the structure, a fixed drainage steel pipe structure does not need to be arranged, a drainage system is simplified, the situation that the drainage pumping station overturns or the metal hose is bent in the water level changing process is avoided, and smooth water pumping and drainage operation is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance of hydropower stations, in particular to a drainage system used for drainage maintenance of an underflow stilling pool of a hydropower station. Background Art

[0002] Before the overall overhaul of the bottom flow stilling pool of a hydropower station, it is necessary to pump out the water from the stilling pool in order to create a dry land maintenance environment. Due to the large depth of the stilling pool, some large stilling pools are more than 20 meters deep, resulting in a large amount of pumping and drainage operations. In addition, for deep bottom flow stilling pools, in order to improve the stability of the drainage system, the end away from the drainage pump station is generally connected to a drainage steel pipe installed and fixed on the upstream vertical surface or top surface of the tail sill of the stilling pool. However, there are problems such as the complicated hoisting and disassembly process of the drainage steel pipe and the high safety risk. In particular, the drainage steel pipe fixed on the upstream vertical surface of the tail sill of the stilling pool needs to be sunk into the water in the stilling pool during hoisting. The steel pipe is long and heavy, and water injection is required to sink the steel pipe into the water to complete the fixation. The process is complicated, and the safety risks of lifting, edge and water operations are all high. Summary of the invention

[0003] The problem to be solved by the utility model is to provide a pumping and drainage system for drainage inspection and maintenance of the bottom flow stilling pool of a hydropower station. There is no need to set up a fixed drainage steel pipe structure, which simplifies the drainage system and avoids the pulling or bending of the metal hose during the water level change process, thereby ensuring the smooth progress of the pumping and drainage operation.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pumping and drainage system for drainage and maintenance of the bottom flow stilling pool of a hydropower station, including a drainage pump station, which is located on the water surface inside the stilling pool body. A metal hose is connected to the outlet pipe of the drainage pump station. The metal hose is arranged along the water surface inside the stilling pool body, passes through the top surface of the tail sill at one end of the stilling pool body, and extends to the outside of the stilling pool body.

[0005] In a preferred solution, a buoy is provided on the metal hose floating on the water surface in the energy dissipation basin.

[0006] In the preferred solution, the metal hose is composed of multiple sections of hoses, and adjacent hoses are connected by flanges. Except for the hose at the very beginning connected to the outlet pipe of the drainage pump station and the hose at the very end placed on the outflow from the top surface of the tail sill, the sum of the lengths of other hoses is greater than the planned drainage depth of the energy dissipation basin.

[0007] In a preferred solution, a plurality of clamps are provided on the tail sill, and the clamps are anchored on the top surface of the tail sill. The clamps are clamped on the metal hose and fix the metal hose on the tail sill.

[0008] In a preferred solution, the drainage pump station is provided with a counterweight placed on the upstream side, and the weight of the counterweight on the drainage pump station is increased in a timely manner according to the drop in water level.

[0009] In the preferred solution, the drainage pump station is provided with a pump station traction rope, one end of which is connected and fixed to the drainage pump station, and the other end extends to the top surface of the guide wall and is fixed. The length of the pump station traction rope is extended in time according to the drop in water level.

[0010] In a preferred solution, there are multiple drainage pump stations, and each drainage pump station is equipped with a metal hose for outflow.

[0011] The utility model provides a drainage system for drainage inspection and maintenance of the bottom flow stilling pool of a hydropower station, which has the following beneficial effects by adopting the above structure:

[0012] (1) Direct outflow through metal hoses, without the need to set up a fixed drainage steel pipe structure, simplifies the drainage system, avoids the installation and removal of drainage steel pipes, reduces the risks of lifting, edge and water operations during the installation and removal of the drainage system, and saves economic costs;

[0013] (2) By adopting a floating metal hose design, the hose can automatically adjust to the optimal water absorption depth according to the changes in the water level in the energy dissipation pool, ensuring that the accumulated water in the pool can be absorbed to the maximum extent under various water level conditions, effectively improving the drainage efficiency of the energy dissipation pool. By arranging multiple drainage pumping stations, it can meet the drainage and maintenance needs of large energy dissipation pools;

[0014] (3) When the water level drops, the drainage pump station is balanced by adding counterweights on the upstream side of the pump station to prevent the drainage pump station from tipping over due to the gravity and tension of the metal hose filled with water on the downstream side of the pump station.

[0015] (4) During the process of water level dropping, by adjusting the length of the pump station traction rope, the drainage pump station can be driven to move stably toward the downstream tail sill, avoiding the rapid movement of the drainage pump station causing the metal hose to be bent, thereby causing damage to the metal hose and reducing the drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the top structure of the utility model.

[0019] In the figure: energy dissipation pool body 1, tail sill 2, drainage pump station 3, metal hose 4, guide wall 5, clamp 6, buoy 7, counterweight 8, pump station traction rope 9. DETAILED DESCRIPTION

[0020] like Figure 1 In the present invention, a drainage system for drainage and maintenance of an underflow stilling pool of a hydropower station includes a drainage pump station 3, which is located on the water surface in a stilling pool body 1. A metal hose 4 is connected to the outlet pipe of the drainage pump station 3. The metal hose 4 is arranged along the water surface in the stilling pool body 1, passes through the top surface of the tail sill 2 at one end of the stilling pool body 1, and extends to the outside of the stilling pool body 1.

[0021] In a preferred solution, a buoy 7 is provided on the metal hose 4 floating on the water surface in the energy dissipation basin 1 .

[0022] In the preferred solution, the metal hose 4 is composed of multiple sections of hoses, and adjacent hoses are connected by flanges. Except for the hose at the very beginning connected to the outlet pipe of the drainage pump station 3 and the hose at the very end placed on the top surface of the tail sill 2, the sum of the lengths of other hoses is greater than the planned drainage depth of the energy dissipation basin body 1.

[0023] In a preferred solution, a plurality of clamps 6 are provided on the tail sill 2 . The clamps 6 are anchored on the top surface of the tail sill 2 . The clamps 6 are clamped on the metal hose 4 to fix the metal hose 4 on the tail sill 2 .

[0024] In a preferred solution, the drainage pump station 3 is provided with a counterweight 8 placed on the upstream side, and the weight of the counterweight 8 on the drainage pump station 3 is increased in a timely manner according to the drop in water level.

[0025] In a preferred solution, a pump station traction rope 9 is provided on the drainage pump station 3, one end of which is connected and fixed to the drainage pump station 3, and the other end of which extends to the top surface of the guide wall 5 and is fixed.

[0026] In a preferred solution, there are multiple drainage pump stations 3, and each drainage pump station 3 is equipped with a metal hose 4 for outflow.

[0027] The present invention discloses a pumping and drainage system for drainage inspection and maintenance of underflow stilling pools in hydropower stations. When performing stilling pool drainage operations:

[0028] like Figure 1As shown, the drainage pump station 3 is hoisted to the water surface, and then the end of the hose connected to the outlet pipe of the drainage pump station 3 at the head end of the metal hose 4 is connected to the outlet pipe of the drainage pump station 3, and the drainage pump station and the one section of hose connected thereto are pulled upstream through the pump station traction rope 9, and the next section of hose is hoisted and connected to the flange of the previous section of hose, and then the drainage pump station and the two sections of hose connected thereto are pulled upstream through the pump station traction rope 9, and the next section of hose is hoisted, and so on until the installation of the hose placed at the end on the top surface of the tail sill 2 is completed. During this process, buoys 7 are installed under the metal hose 3 at intervals for floating support. After the metal hose 3 is hoisted and connected, it is then reinforced by the clamp 6, and a counterweight is installed at the drainage pump station 3, and then the drainage operation in the energy dissipation pool 1 can be directly carried out by relying on the drainage pump station 3.

[0029] During the drainage process, personnel regularly conduct drainage inspections to check for any abnormalities, and according to the inclination of the drainage pump station 3, they appropriately add counterweights to the drainage pump station 3 to ensure the balance of the drainage pump station.

[0030] At the same time, as the water level drops, the drainage pump station 3 gradually moves toward the tail sill 2. During this process, the pump station traction rope 9 always maintains traction to ensure that the drainage pump station 3 moves stably without causing the metal hose 4 to bend.

Claims

1. A drainage system for drainage inspection and maintenance of an underflow stilling pool in a hydropower station, comprising a drainage pump station (3), characterized in that: The drainage pump station (3) is located on the water surface in the energy dissipation basin (1). A metal hose (4) is connected to the outlet pipe of the drainage pump station (3). The metal hose (4) is arranged along the water surface in the energy dissipation basin (1), passes through the top surface of the tail sill (2) at one end of the energy dissipation basin (1), and extends to the outside of the energy dissipation basin (1).

2. A drainage system for drainage inspection and maintenance of underflow stilling pool in a hydropower station according to claim 1, characterized in that: A buoy (7) is provided on the metal hose (4) floating on the water surface in the energy dissipation basin (1).

3. A drainage system for drainage inspection and maintenance of underflow stilling pool in a hydropower station according to claim 1, characterized in that: The metal hose (4) is composed of multiple sections of hoses, and adjacent hoses are connected by flanges. Except for the hose whose first end is connected to the outlet pipe of the drainage pump station (3) and the hose whose last end is placed on the top surface of the tail sill (2), the sum of the lengths of the other hoses is greater than the planned drainage depth of the stilling basin (1).

4. A drainage system for drainage inspection and maintenance of underflow stilling pool in a hydropower station according to claim 1, characterized in that: The tail sill (2) is provided with a plurality of hoops (6), the hoops (6) being anchored on the top surface of the tail sill (2), and the hoops (6) being clamped on the metal hose (4) to fix the metal hose (4) on the tail sill (2).

5. The drainage system for drainage inspection and maintenance of underflow stilling pool in a hydropower station according to claim 1, characterized in that: The drainage pump station (3) is provided with a counterweight (8) placed on the upstream side.

6. A drainage system for drainage inspection and maintenance of underflow stilling pools in hydropower stations according to claim 1, characterized in that: The drainage pump station (3) is provided with a pump station traction rope (9), one end of which is connected and fixed to the drainage pump station (3), and the other end of which extends to the top surface of the guide wall (5) and is fixed.

7. The drainage system for drainage inspection and maintenance of underflow stilling pool in a hydropower station according to claim 1, characterized in that: There are a plurality of drainage pump stations (3), and each drainage pump station (3) is equipped with a metal hose (4) for separate outflow.

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