Boulder apron energy dissipating and scour preventing structure and construction method thereof

Abstract

The invention relates to a boulder apron energy dissipating and scour preventing structure and a construction method thereof, aiming at providing the boulder apron energy dissipating and scour preventing structure and the construction method thereof, protecting a riverbed from being scoured and achieving the aim of preventing scour. The invention adopts the technical scheme that the boulder apron energy dissipating and scour preventing structure comprises a concrete gate dam built on a gate dam foundation, wherein a concrete apron is cast at the downstream side of the gate dam. The boulder apron energy dissipating and scour preventing structure is characterized in that a first-stage boulder apron and a second-stage boulder apron are sequentially paved at the downstream side of the concrete apron along the direction of a water current; a bottom-layer boulder in the first-stage boulder apron is uniformly divided into three parts, a top-layer boulder is uniformly divided into four parts, and all parts are arranged in parallel along the width direction of a river channel; and the second-stage boulder apron is uniformly divided into three parts which are arranged in parallel along the width direction of the river channel. The boulder apron energy dissipating and scour preventing structure and the construction method thereof disclosed by the invention are suitable for water conservancy and hydropower pivotal projects, particularly for the low-head water conservancy and hydropower pivotal projects in mountain areas.

Description

technical field [0001] The invention relates to an energy-dissipating and anti-scouring structure of a large stone apron and a construction method thereof, which is mainly applicable to key water conservancy and hydropower projects, especially water conservancy and hydropower project with low water head in mountainous areas. Background technique [0002] In water conservancy and hydropower projects, the discharge structure is the key to ensure the safety of the reservoir and give full play to the benefits of the project. The energy dissipation structure is an integral part of the drainage structure, which is responsible for dissipating part or most of the flow energy of the water, and can make the water flow discharged by the energy dissipator work properly connected with the original water flow of the downstream channel. When designing, it is necessary to consider the destructive effects of cavitation, pulsation, vibration, wear, and erosion that may be caused by the discha...

AI Technical Summary

Problems solved by technology

However, hydraulic jump energy dissipation generally requires the construction of stilling pools, which have certain requirements on the downstream water depth. In order to meet the conditions for submerged hydraulic jumps, sometimes it is necessary to increase the downstream water depth by excavating or building tail sills. The excavation volume is relatively large, and the apron Generally, it is a reinforced concrete structure with long construction time and high cost; when the water head is high, the front of the apron bears a high flow rate, which is prone to cavitation and wear, and the problems of hydrodynamic force and pulsating load are more prominent. Maintenance is also inconvenient

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