Arc-shaped bottom plate drop sill underflow stilling pool

Abstract

The invention relates to an arc-shaped bottom plate drop sill underflow stilling pool. The arc-shaped bottom plate drop sill underflow stilling pool is suitable for a bottom flow energy dissipation technology of high water head, large flow and narrow river valley. The arc-shaped bottom plate drop sill underflow stilling pool is simple and feasible in structure, can effectively improve the energy dissipation rate and reduce the construction cost, and has a good application prospect. According to the technical scheme, the arc-shaped bottom plate drop sill underflow stilling pool is arranged at a discharge chute outlet of a flood discharge building and is characterized in that a drop sill is formed between the top face of a bottom plate at the head of the stilling pool and the discharge chute outlet; the height of the drop sill gradually changes in the transverse direction; and the height h1 of the middle of the drop sill is larger than the height h2 of the two sides of the drop sill.

Description

technical field [0001] The invention relates to a bottom flow stilling pool with a curved bottom plate, which is suitable for the bottom flow energy dissipation technology of high water head, large flow and narrow river valleys. Background technique [0002] Bottom flow energy dissipation is a commonly used energy dissipation method in water conservancy and hydropower projects. Underflow energy dissipation has the advantages of reliable operation, stable flow state, strong adaptability to geological conditions, and slight atomization of flood discharge. Early bottom flow energy dissipation was mostly used in middle and bottom water head projects. For high water head projects, due to the high hydraulic indicators such as flow velocity and pulsating pressure in the stilling basin, the risk of damage to the stilling basin is relatively high, and the use of bottom flow energy dissipation is less. In recent years, with the construction of projects such as Xiangjiaba and Guandi, ...

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Problems solved by technology

[0003] However, for high dam projects in alpine and canyon areas, the layout width of flood discharge structures is often limited, the single width of flood discharge is large, the flow is large, and the energy is concentrated, and the design of energy dissipation for bottom flow stilling basins is still very difficult.

In addition, for high dam projects in alpine and canyon areas, due to the relatively deep rock cutting and thick covering layer in the channel, the elevation difference between the center of the channel and the bedrock floor on both sides is often large, and the thickness of the bottom plate in the middle of the stilling pool is often much greater than the thickness of the bottom plates on both sides. , leading to a large amount of concrete in the bottom flow stilling basin, and the economy is relatively poor

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