Plunge pool structure used for high arch dam, narrow canyon and large-flow flood discharge hole

Abstract

The invention discloses a plunge pool structure used for a high arch dam, a narrow canyon and a large-flow flood discharge hole and belongs to the technical field of design and manufacturing of hydraulic structures. The plunge pool structure used for the high arch dam, the narrow canyon and the large-flow flood discharge hole, which can effectively reduce the water leakage condition of a concrete bottom plate and relieve the operation pulse pressure of a plunge pool, is provided. The plunge pool structure comprises a plunge pool body covered by a concrete bottom plate; water discharging galleries are arranged under the concrete bottom plate; structural joints are arranged on the concrete bottom plate; the plunge pool structure further comprises a water discharging system and a structural joint sealing system; the structural joint sealing system comprises at least two layers of water stopping assemblies which are sequentially arranged in the structural joints along the thickness direction of the concrete bottom plate; the water discharging system comprises a plurality of water discharging blind ditches with the two ends which are connected into the two adjacent water discharging galleries; the water discharging blind ditches and the structural joints are correspondingly arranged at the lower side corner of a rear pouring concrete block of the concrete bottom plate one by one.

Description

technical field [0001] The invention relates to a water cushion pond structure, in particular to a water cushion pond structure used for high arch dams, narrow canyons and large-flow flood discharge orifices, and belongs to the technical field of design and construction of hydraulic structures. Background technique [0002] With the increase of the country's demand for hydroelectric clean energy, a large number of high dams have been built for the construction of hydropower stations. In order to reduce the erosion of the dam site and both sides of the dam by the flood discharge from the orifices of the dam body, such as surface holes, middle holes, and deep holes, a structure for flood discharge and energy dissipation behind the dam was also built accordingly. [0003] The flood discharge and energy dissipation method of the orifice of the high dam body generally adopts the excavation of the riverbed behind the dam and the construction of a water cushion pond with a secondar...

AI Technical Summary

Problems solved by technology

[0006] The traditional water cushion pond is a "simple trapezoidal flat bottom" water cushion pond. When the scale of the water cushion pond is large, the side wall of the water cushion pond is high, which is not convenient for the construction and maintenance of the water cushion pond; The corners of the walls are intersected by broken lines. When the flood discharge power of the dam body orifice is large, the concrete at this part is prone to erosion and damage under the long-term and huge amount of flood discharge.

[0007] The use of flat-bottomed pad ponds for energy dissipation in high arch dams has the following disadvantages: when checking the emptying of the pads, the accumulated water in the pads is not easy to gather; when checking the emptying of the pads , due to the influence of the silt in the pond, the last 10-20cm deep water on the floor of the traditional pond is not easy to be emptied by the pump

[0012] When the traditional water cushion pond is emptied and overhauled, it is necessary to stop the flood discharge at the orifice of the dam body, first use the pump to discharge the accumulated water in the water cushion pond into the downstream channel of the Erdao Dam, then inspect the water cushion pond, and repair the damaged parts Finally, after the overhaul of the water cushion pond is completed, the traditional structure of the water cushion pond needs to use a pump to fill the water cushion pond from the downstream channel to form a water cushion of the designed thickness. This filling time is relatively long. The water cushion with the designed thickness cannot be quickly formed in the water cushion pond, resulting in the inability of the water cushion pond to be put into operation quickly, which brings uncertain risks to the flood discharge of the dam

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