Multifunctional anti-scouring sand bar

Abstract

The invention discloses a multifunctional scouring resistance sand blocking dike which comprises a wall body made of cast-in-place reinforced concrete. The longitudinal section of the wall body is of a right-angled trapezoidal structure. The bottom foundation of the wall body is of a tooth plate structure. The inclined wall face, located on the upper stream side, of the upper portion of the wall body is fixedly connected with a water permeable baffle extending towards the upper stream side. The water permeable baffle is provided with multiple vertical water permeable holes in the vertical direction. Multiple horizontal water permeable units are arranged on the portion, between the water permeable baffle and a river bed, of the wall body. Each horizontal water permeable unit is formed by multiple rectangular horizontal water permeable holes at up-down intervals. The portion, located at each horizontal water permeable unit, on the inclined wall face of the upper stream side is covered with water permeable geotechnical cloth, and the water permeable geotechnical cloth is fixed to the inclined wall face on the upper stream side through a steel wire net frame. By the adoption of the multifunctional scouring resistance sand blocking dike, the flow speed of the upper stream side of the sand blocking dike is lowered, and fine sediment aggradation is facilitated; and the sand blocking wall body share the dike top excess flow, so that the back-water height of the front of the dike is lowered, the water flow energy below the dike is weakened, and the scouring effect on the sand blocking underwater bed is weakened.

Description

technical field [0001] The invention relates to a sand-retaining sill in a river course improvement project, in particular to a multifunctional anti-scouring sand-retaining sill. Background technique [0002] For river channel improvement projects, especially where the river channel buildings are arranged, the scour and undercut of the river bottom are obvious, and the river bottom needs to be designed with sand barriers to form deep trough deposits, raise the local river bed, and achieve the protection purpose of stabilizing the river bed surface. At present, in order to stabilize part of the river bottom changes at mountain mouths and rivers with large gradients at home and abroad, sand barriers are often used to prevent the unbalanced flow of the river from flowing down, so as to maintain a stable river bottom at a certain elevation. The sand-retaining sill usually adopts a straight-wall structure, the lower part is buried in the river bottom, and the suspended part is us...

AI Technical Summary

Problems solved by technology

However, in the application, the straight-wall structure has problems such as slow silting of fine particles, concentrated water flow in the downstream, which may cause trace-back scour, damage the foundation at the bottom of the sill, and lead to instability and destruction of the sand-blocking sill.

In engineering, the foundation of the straight wall is also reinforced, but there is no structural type that uses the structure of the sand barrier itself to reduce water energy, accelerate sedimentation, and slow down the flow of water.

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