Gap distribution-type auxiliary weir structure

Abstract

The invention discloses a gap distribution-type auxiliary weir structure and relates to the technical field of hydraulic structure design. The problem that weir-passing waterflow of an existing auxiliary weir easily forms deflected scour flow, accordingly a close-weir downstream reservoir bank is soured, the weir-passing waterflow continuously sours downstream apron and a riverbed, and the cost for supporting the downstream reservoir bank is remarkably increased is solved. According to the adopted technical scheme, the gap distribution-type auxiliary weir structure is a gravity weir, a gap is formed in the middle of the top face of the weir, falling of downward discharged waterflow at the auxiliary weir is decreased, and scouring to a riverbed base plate and the reservoir bank is weakened. The gap formed in the top face of the weir is close to a downstream weir face, or distributing piers are arranged at the gap formed in the top of the downstream weir face at intervals, so that the distributed weir-passing waterflow is discharged in an approximate and uniform distribution mode in a centralized form, the possibility of backflow and deflected scour flow is reduced, the waterflow passing through the weir smoothly and stably returns back to a tank, and the scouting to the reservoir bank is reduced. A continuous pressing slope body is arranged at the top of an upstream weir face, and the waterflow in a plunge pool is prevented from flowing across the top face of the weir, so that the energy dissipation of the waterflow is full.

Description

technical field [0001] The invention relates to the technical field of design of hydraulic structures, in particular to a gap-splitting secondary dam structure of a hydraulic energy dissipation structure. Background technique [0002] In recent years, with the country's increasing requirements for green and clean energy and environmental protection in engineering construction, water conservancy and hydropower engineering construction has gradually shifted from a technology-fund-constrained type to an environment-constrained type. How to minimize the impact on the ecological environment during the project construction period has become a special concern of the project construction unit and relevant river basin organizations. In water conservancy and hydropower projects, the impact of the discharge of water from the reservoir area on the riverbed and reservoir bank is a common environmental problem in hydropower projects. [0003] Under the existing technical conditions, in o...

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Problems solved by technology

[0006] The invention provides a notch diversion type two-way dam structure, which solves the problem that the existing two-way dam structure has no significant effect on the improvement of the flow state of the water flow passing through the dam, and it is easy to form a folding and flushing water flow, which will cause erosion of the bank near the downstream of the dam; and The water flow across the dam continues to scour the downstream apron and riverbed, resulting in a significant increase in the cost of downstream bank support

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