Low-overflow dam equal-water head step-by-step energy dissipation structure

Abstract

The invention discloses a low-overflow dam equal-water head step-by-step energy dissipation structure. The structure comprises an overflow dam; the overflow dam is provided with a first-grade overflow dam absorption basin, a second-grade overflow dam absorption basin and a third-grade overflow dam absorption basin; the first-grade overflow dam absorption basin is connected with the dam top of the overflow dam through an equal-water head first-grade overflow dam vertical wall surface; the bottom of the first-grade overflow dam absorption basin is connected with an equal-water head first-grade drainage energy dissipation pipe; the second-grade overflow dam absorption basin is connected with a first-grade overflow dam absorption basin streamline sill through an equal-water head second-grade overflow dam vertical wall surface; and the bottom of the first-grade overflow dam absorption basin and the bottom of the second-grade overflow dam absorption basin are connected with an equal-water head second-grade drainage energy dissipation pipe. Compared with the prior art, the structure adopts such designs as equal-water head energy dissipation pipe graded drainage energy dissipation, equal-water head graded vertical overflow, flooding jet absorption basin energy dissipation, advanced overflow and reservoir capacity increment, and is prominent in cavitation resisting effect of overflow surfaces, better in energy dissipation effect, simple in structure, lower in maintenance cost and larger in popularization space.

Description

technical field [0001] The invention is a step-by-step energy-dissipating structure of low overflow dam and other water heads designed for concrete overflow dam overflowing, cavitation and cavitation often occur on the overflow surface, and serious erosion of the riverbed by the discharged water flow. It belongs to the field of hydraulic engineering. Background technique [0002] At present, the overflow surface of most concrete overflow dams is designed as a streamlined surface. When overflowing, the potential energy of the water flow at the top is relatively high, and the velocity is relatively low. The lower you go, the greater the velocity of the water flow. Therefore, in the design and construction, the overflow surface is required to be smooth, and there should be no blunt body structure to reduce cavitation. occurrence of cavitation. However, in actual operation, due to construction, wind, sun and other factors on the surface of the overflow dam, small protrusions a...

AI Technical Summary

Problems solved by technology

However, in actual operation, due to construction, wind, sun and other factors on the surface of the overflow dam, small protrusions and depressions will appear on the overflow surface; after overflow, cavitation will occur on the overflow surface, and in severe cases, The concrete under the steel bars has been hollowed out, which increases the maintenance cost year by year. At the same time, the concentrated energy dissipation has a serious impact on the downstream riverbed, so the existing technology has shortcomings.

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