Bridge pier protective device

Abstract

The invention relates to a bridge pier protective device comprising at least one anti-collision structure and connection structures used for connecting the adjacent anti-collision structures or the anti-collision structure and a bridge pier. Each anti-collision structure comprises an outer layer collision bearing structure, a middle energy-absorbing supporting structure and an inner layer protective structure, wherein the middle energy-absorbing supporting structure is a negative poisson ratio structure formed in the manner that multiple layers of energy absorbing units are arranged in an intersecting manner according to a certain law, each energy-absorbing unit is in an inwards concave hexagon and comprises a group of opposite side plates and a group of inwards concave folded plates opposite to each other, and the included angle between each side plate and the corresponding inwards concave folded plate is smaller than 90 degrees. The anti-collision structure has the negative poisson ratio feature, the energy dissipation time is effectively prolonged, the deformation degree of the energy absorption material is effectively improved, the protective function of the anti-collision device on the bridge pier and other aquatic buildings is greatly improved, and the structure stability is also improved. The structure of the energy-absorbing units is periodically arranged, so that the structure is simple, the production technology is simple, and the product quality is easy to control; and in this way, the anti-collision effect can be improved, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of building anti-collision, in particular to a bridge pier protective device. Background technique [0002] Accidents of damaged bridges caused by the impact of bridge piers happen frequently, and the economic losses are huge. Therefore, the research on the anti-collision device of the bridge pier is very important. Existing pier anti-collision devices are of a great variety, with various structures and material forms. After years of research and application, artificial islands made of sand and stones, flexible anti-collision blocks that use rubber and other materials to dissipate energy, and floating or fixed anti-collision boxes have been developed. The principle is based on outbuilding barrier, energy absorption, momentum buffering. [0003] Among them, the crash box structure has many advantages such as moderate cost, high protection, and convenient manufacture and installation. It is the most widely...

AI Technical Summary

Problems solved by technology

But the section of the energy-absorbing unit inside the existing anti-collision box generally adopts a positive Poisson's ratio structure such as a regular quadrilateral, a regular hexagon, a regular octagon or a circle. , the structure of the anti-collision box will expand perpendicular to the direction of the force, and a large stress concentration phenomenon will appear at the impact position. As the ship continues to intrude forward, the box structure will rapidly tear and fail, resulting in Crash structure rapidly fails

As a result, the effective energy dissipation time of the structure during the impact is much shorter than expected, and the protective effect on bridge piers and other buildings is limited, and it cannot meet the increasingly stringent anti-collision protection requirements

Images