River bridge foundation local protection method and device

Abstract

The invention provides a local protection method and device for a river bridge foundation, and the method comprises the steps: leading high-flow-speed water flow on the surface layer of a river to a position close to a riverbed through a pipeline, and changing horizontal flow into vertical upward flow; the device is located below the riverway water surface line, surrounds the periphery of a pier and is of a pipeline structure, the inner wall of the device is coated with a super-hydrophobic coating, and a guiding pipeline is formed between the upstream side of the upper portion of the pier and the upstream side of the bottom of the pier through a water inlet section, a water guiding section and a water outlet section to guide riverway water flow on the upper portion of the pier to the upstream side of the bottom of the pier to be close to a riverbed. The water flows out upwards in the direction perpendicular to the advancing direction of the river channel water flow at the bottom of the pier and interferes with the pier front descending water flow causing local scouring of the river channel advancing water flow in front of the pier, so that the water flow structure of the pier front descending water flow is damaged, and the strength of the pier front descending water flow and the horseshoe-shaped vortex is weakened. The bridge foundation can resist scouring of river water flow, the local scouring degree of the bridge foundation is reduced, and the safety performance of the bridge foundation is improved.

Description

technical field [0001] The invention relates to a local protection method and device for a river bridge foundation. Background technique [0002] The construction of bridge foundation piers in the river channel will change the flow field around the pier and form a complex and variable three-dimensional flow state. Downflow and horseshoe-shaped vortex will be formed in front of the pier, and tail vortex will be formed behind the pier. The horseshoe-shaped vortex and wake vortex enhance the transportation capacity of sediment and other substances on the surface of the river bed, thus forming obvious local scour pits around the bridge piers, which will reduce the effective embedding depth of the bridge foundation in the soil at the bottom of the river bed, resulting in pile foundations The decrease in bearing capacity greatly affects the safety and stability of the bridge. The impact of water scouring in front of the pier on the safety and stability of the bridge will be more ...

AI Technical Summary

Problems solved by technology

The horseshoe-shaped vortex and wake vortex enhance the transport capacity of sediment and other substances on the surface of the river bed, thus forming obvious local scour pits around the bridge piers, which will reduce the effective embedding depth of the bridge foundation in the soil at the bottom of the river bed, resulting in pile foundation The bearing capacity drops, greatly affecting the safety and stability of the bridge

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