Gravel pile foundation stilling pool on deep covering layer and construction method

Abstract

The invention discloses a gravel pile foundation stilling pool on a deep covering layer. The gravel pile foundation stilling pool comprises the covering layer, a bedrock layer, a bottom plate and a side wall, the bottom plate comprises two side bottom plates and a plurality of middle bottom plates, the middle bottom plates are arranged between the two side bottom plates, the bottom of the side wall is connected with the upper surfaces of the side bottom plates, transverse joints are arranged between the middle-section bottom plates and the side bottom plates, transverse joints are also arranged between every two adjacent middle-section bottom plates, a concrete cushion layer is arranged on the lower surface of each bottom plate, vertical drainage channels are formed in the bottom plates and are embedded into the concrete cushion layers, gravel piles are arranged on the lower surfaces of the concrete cushion layers and penetrate through the covering layer, and the pile bottoms of the gravel piles are embedded into the bedrock layer, meanwhile, the invention further discloses a construction method of the gravel pile foundation stilling pool on the deep covering layer. On the premise of reducing excavation of the covering layer foundation of the stilling pool and the engineering amount of structural concrete, the bearing capacity of the covering layer foundation is improved, the structural stability and safety of the stilling pool can be guaranteed, and the engineering amount and the engineering investment are saved.

Description

technical field [0001] The invention relates to a gravel pile foundation stilling pool on a deep covering layer and a construction method thereof, belonging to the technical field of water conservancy and hydropower engineering. Background technique [0002] In water conservancy and hydropower engineering, for the high-speed discharge flow, in order to reduce the erosion of the natural channel behind the dam and ensure the safety of the main body of the dam, three energy dissipation methods are mainly used to dissipate the energy of the discharge flow: deflecting flow energy dissipation, bottom flow dissipation energy, surface flow energy dissipation. When the topographical conditions of the discharge water flow energy dissipation area are limited, the erosion resistance of the river bank is poor, the downstream water level is relatively shallow, and the water level varies greatly, the energy dissipation method of the discharge water flow is usually the bottom flow energy di...

AI Technical Summary

Problems solved by technology

[0004] There are also some projects where the bottom plate of the stilling tank is placed on the covering layer, and the foundation anchor bar is not arranged on the bottom plate of the stilling tank. Because the drainage channel is easily blocked by the sediment at the bottom of the stilling tank, no basic drainage channel is set up, and generally only rely on the self-weight of the bottom plate. To counteract the effect of uplift pressure, in order to make the stilling basin meet the anti-floating stability, the thickness of the bottom plate of the stilling basin on the deep covering layer is generally large, resulting in high engineering quantity and investment. The force requirements are relatively large, and the structure of the stilling pool is prone to subsidence and deformation due to insufficient bearing capacity of the bottom covering layer, which endangers the safety of the structure

Images