Anti-scouring platform for pile foundations of bridge pipe group and construction method of anti-scouring platform

Abstract

The invention discloses an ant-scouring platform for pile foundations of a bridge pile group and a construction method of the anti-scouring platform. The construction method of the pile foundations ofthe bridge pile group comprises the following steps that a platform framework is manufactured, steel wire meshes are arranged on the side faces and the bottom surface of the platform framework, and anti-bending steel bars are arranged at pile holes of the platform framework; a platform foundation pit is excavated, the platform framework is placed in the platform foundation, and a plurality of pile foundations penetrate through the pile holes in the platform framework and do not make contact with the pile holes; pebbles with the diameter greater than the mesh diameter of the steel wire meshesare placed into the platform framework; grout is injected between the pile holes and the pile foundations, and grout is injected into the platform framework to integrate the platform with the pile foundations; and the surface of the platform is trowelled to be flush with the bottom surface of a riverbed. The surface of the platform can bear vortexes and trailing vortexes formed by interaction of water piles, so that the formation of scour pits of the pier pile foundations is effectively prevented, the situation that the effective depth of the pipe foundations in soil is decreased is prevented,the safety of a bridge is improved, and the service life of the bridge is prolonged.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to an anti-scouring cap for bridge pile group pile foundations. 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 al...

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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