Novel shape deep hole with outlet water flow lateral diffusion reduction function

Abstract

The invention discloses a novel shape deep hole with an outlet water flow lateral diffusion reduction function and belongs to the technical field of drainage building design. The novel shape deep hole with the outlet water flow lateral diffusion reduction function comprises a deep hole body with an emergency valve, a maintenance valve and a transverse seam, the deep hole body comprises an inlet, a barrel and an outlet, both the two sides of the outlet are provided with abutment piers, both the inlet cross section and the outlet cross section of the deep hole body are rectangular, the inlet cross section vertical height is higher than the outlet cross section vertical height, the deviation of the vertical height is not more than 35%, and the transverse width of the inlet cross section is smaller than the transverse width of the outlet cross section. The novel shape deep hole with the outlet water flow lateral diffusion reduction function has a more reasonable shape and is suitable for the deep hole of which sizes of the inlet cross section and the outlet cross section are different, and meanwhile, the phenomenon of outlet water flow lateral diffusion is significantly reduced, water flow is prevented from lashing against the abutment piers, and the structure stability of the deep hole outlet abutment piers is protected effectively.

Description

technical field [0001] The invention relates to the technical field of drainage building design, and more specifically relates to a new body-shaped deep hole with the function of reducing the lateral diffusion of outlet water flow. Background technique [0002] At present, with the construction of high-head water conservancy and hydropower projects, high-head flood discharge deep holes are widely used in the dam flood discharge system, which undertakes a huge flood discharge task. The design shape of the flood discharge not only needs to ensure the safety of its own structure, but also considers The impact of flood discharge on downstream stability, due to various restrictions on the space of high arch dams, the entrance of the deep hole and the exit of the deep hole cannot be on the same straight line, so the deep hole may have a certain deflection angle in the dam body. Considering the safety of the downstream, it is required that the drop point of the deep hole discharge ...

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Problems solved by technology

[0002] At present, with the construction of high-head water conservancy and hydropower projects, high-head flood discharge deep holes are widely used in the dam flood discharge system, which undertakes a huge flood discharge task. The design shape of the flood discharge not only needs to ensure the safety of its own structure, but also considers The impact of flood discharge on downstream stability, due to various restrictions on the space of high arch dams, the entrance of the deep hole and the exit of the deep hole cannot be on the same straight line, so the deep hole may have a certain deflection angle in the dam body. Considering the safety of the downstream, it is required that the drop point of the deep hole discharge tongue should be scattered in space, which requires that the deep hole outlet must use a certain lifting or pressing composite shape. Various factors lead to deep hole hydraulic problems and its Complicated, due to the existence of the gradual change of the body shape of the deep hole, especially the longitudinal compression of the outlet, the water flow at the outlet of the deep hole has a large divergence angle in the horizontal direction. The pier structure is unstable, and the flow velocity at the outlet of the deep hole with high water head often exceeds 35m / s. The impact of the high-speed water flow on the side pier is more serious. There is an urgent need for a new type of deep hole that can effectively reduce the lateral diffusion of the water flow at the outlet of the deep hole.

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