NACA (National Advisory Committee for Aeronautics) type water injection device used for scouring prevention of bridge pier tandem pile foundation, and construction method thereof

Abstract

The invention discloses an NACA (National Advisory Committee for Aeronautics) type water injection device used for the scouring prevention of a bridge pier tandem pile foundation, and a construction method thereof, and relates to the technical field of bridge pile foundation reinforcement. The NACA type water injection device used for the scouring prevention of the bridge pier tandem pile foundation comprises an NACA airfoil shape structure and a plurality of fixing piles, wherein the cross section of the NACA airfoil shape structure is of an NACA airfoil shape; the NACA airfoil shape structure is provided with a pile foundation insertion hole of which the section is the NACA airfoil shape; and the NACA airfoil shape structure is sheathed to the outer surface of the bridge pier tandem pilefoundation through the pile foundation insertion hole and is fixed through the plurality of fixing piles. Since the periphery of a part, which is in contact with water, of the bridge pier tandem pilefoundation is coated with the NACA airfoil shape structure, damage on the tandem pile foundation by a horseshoe vortex and a trailing vortex can be effectively inhibited, the pile foundation preventsfrom being scoured and corroded by water, and the bearing capacity of the tandem pile foundation is improved. Meanwhile, the protection device disclosed by the invention can be suitable for built bridge pile foundations and unestablished bridge pile foundations, and has the characteristics of being simple and quick to construct, low in cost, safe and environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of bridge pile foundation reinforcement. Background technique [0002] In recent years, my country's economy has developed rapidly, and a large number of large bridges across large rivers, such as the Hong Kong-Zhuhai-Macao Bridge, the Donghai Bridge, the Hangzhou Bay Bridge, and the Lijiatuo Bridge in Chongqing, have been built immediately. Most of these river-crossing bridges adopt deep-water pile group foundations, and their volume and water-blocking area are relatively large. The safety and stability of bridge pile foundations in complex water flow environments not only depend on their stress conditions in complex water environment, but also are related to the shallowing of bridge pile foundations caused by water erosion, which leads to the reduction of pile foundation bearing capacity. And a large number of investigation and statistical results also show that one of the main reasons for bridge damage i...

AI Technical Summary

Problems solved by technology

The formation and movement of the horseshoe-shaped vortex and wake vortex enhance the transport capacity of the surface material of the river bed, thus forming obvious local scour pits in the bridge pile foundation, which will reduce the effective embedding depth of the bridge pile foundation in the subsoil soil, As a result, the bearing capacity of the pile foundation decreases, which greatly affects the safety and stability of the bridge, and in mountainous cities, the water flow velocity is greater, and the impact of water scour on the safety and stability of the bridge will be even greater.

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