Protection method capable of combing sacrifice pile group with bottom protection ripraps to resist local scour of pier foundation

Abstract

The invention relates to a protection method capable of combing a sacrifice pile group with bottom protection ripraps to resist local scour of a pier foundation. The protection method comprises the following steps that the sacrifice pile group is arranged at the front of a bridge main pier; the bottom protection ripraps are arranged around the pier foundation; the sacrifice pile group determined based on a flow direction and a hydraulic condition is a first defense line; a triangular arrangement mode, a quincuncial arrangement mode or a height variation arrangement mode can be adopted according to practical natural conditions so as to guide a flood torrent and to dissipate the energy of the flood torrent; and the shapes, the sizes and the grades of the bottom protection ripraps are selected near the pier foundation according to a riverbed condition, so that the bottom protection ripraps cooperate with the sacrifice pile group at the front of the bridge main pier, and the effects of energy dissipation, scour reduction, bottom protection and corrosion protection are exerted. Compared with the prior art, according to the protection method, the advantages of an active protection methodand a passive protection method are fully developed, the factory preprocessing can be carried out, the field processing can also be carried out, the production and the construction are simple and convenient, the long-term use can be achieved after the one-time investment, the practical protection effect is good, and the required repair and maintenance cost is low.

Description

technical field [0001] The invention relates to a bridge pier anti-scouring method, in particular to a protection method for jointly resisting local scour of a bridge pier foundation by sacrificial pile groups and bottom protection riprap. Background technique [0002] With the continuous development of my country's economy, more and more cross-river, river and sea bridge projects are in full swing. These bridges are often located in deep and fast-flowing river sections. Serious scouring will lead to insufficient buried depth of bridge foundations. Furthermore, the bearing capacity is insufficient, making the bridge face the danger of collapse during its service life. How to better solve the local scour problem of bridges has become a major task in today's wading engineering, and it is also a key research direction of scholars at home and abroad. However, the current existing erosion protection methods still remain in the passive protection field, which will lead to increase...

AI Technical Summary

Problems solved by technology

However, the current existing erosion protection methods still remain in the passive protection field, which will lead to increased maintenance and repair costs and increased labor, which is not convenient for long-term use, and cannot fully guarantee structural safety. Water damage caused by partial scour may occur, causing serious economic losses and even casualties

In order to make up for the limitations of traditional passive protection methods, a combined protection method of sacrificial pile groups and riprap for bottom protection is proposed, making full use of the advantages of active protection and passive protection, so as to achieve the effect of energy dissipation, impact reduction, bottom protection and corrosion prevention. Technology is the layout parameters of the pile group and the corresponding rock-ripening parameters, and there is no related report at present

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