Low overflow dam and other water head step-by-step energy dissipation structures

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 low-overflow dam and other water head step-by-step energy dissipation structure designed for concrete overflow dams, when cavitation cavitation often occurs on the overflow surface, and serious erosion of the river bed by the downstream water flow. It belongs to the field of water conservancy engineering. Background technique [0002] At present, the overflow surface of most concrete overflow dams is designed as a streamlined curved surface. When overflowing, the potential energy of the top water flow is larger and the speed is relatively low. The lower the water flow, the greater the speed of the water flow. Therefore, during the design and construction, the overflow surface should be smooth and no bluff body structure should appear to reduce cavitation. Cavitation occurs. However, in actual operation, due to construction, wind and sun, and other factors on the surface of the overflow dam, small protrusions and depressions will appear ...

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.

Images