Base oscillating shock-isolation device for pile foundation bridge pier

Abstract

The invention discloses a base oscillating shock-isolation device for a pile foundation bridge pier. The base oscillating shock-isolation device is characterized by consisting of an overturn-preventing steel strand or reinforcing bar, a pier body, a spread foundation, rubber, a separation face and a foundation. The pier body is connected with the spread foundation and is perpendicular to the same and embedded into the same; the four sides of the spread foundation are filled with the rubber; the overturn-preventing steel strand or reinforcing bar, with one end anchored to a pier top and the other end anchored to the foundation, is inserted into the pier body. According related design specifications, the pier body is separated from the foundation, earthquake energy to the bridge pier is filtered by means of oscillating during design earthquake or rare earthquake, so that application function requirements of the bridge pier under normal service load and frequent earthquake are guaranteed. As the pier body and the foundation are separated in the design earthquake or rare earthquake, both the bridge pier and the foundation can be protected against earthquake.

Description

[0001] technical field [0002] The invention belongs to the technical field of engineering seismic isolation, in particular to a base swing isolation device for pile foundation bridge piers. The pier will sway relative to the foundation under the design earthquake or rare earthquake, and the pier will reset itself after the earthquake, so as to achieve the anti-seismic goal of protecting both the pier and the foundation. Background technique [0003] Considering the intermittence and uncertainty of large earthquakes, the elastic design of reinforced concrete bridges is uneconomical. For bridges designed according to the ductile anti-seismic theory, the plastic hinge area of ​​the piers will also cause permanent residual deformation after the earthquake. Slight damage caused by residual deformation may be repaired, but the bearing capacity after repair is difficult to predict, and severe damage requires reconstruction, which is time-consuming and disrupts traffic. The exis...

AI Technical Summary

Problems solved by technology

The damage caused by residual deformation may be repaired if it is slight, but the bearing capacity after repair is difficult to predict, and if it is serious, it needs to be rebuilt, which is time-consuming and disrupts traffic

The existing support damping and isolation devices have limited deformation capacity, narrow applicable frequency range, strict use conditions, and cannot adapt to the large deformation of the soft soil foundation

Bridges on soft soil sites may resonate with the site after seismic isolation, so bridges cannot be applied to soft soil sites

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