Seismic isolation foundation for bridge

Abstract

The invention discloses the form of a seismic isolation foundation for a bridge. A bearing platform of the bridge is divided into a bridge pier bearing platform and a pile foundation bearing platform in the height direction from top to bottom; the bridge pier bearing platform is integrated with a bridge pier; the pile foundation bearing platform is integrated with a pile foundation; a rectangular groove is formed on the top of the pile foundation bearing platform; a seismic isolation support is laid at the bottom of the groove; the upper part of the seismic isolation support is used for bearing the bridge pier bearing platform; a cofferdam type protective layer is arranged on the outer side of the pile foundation bearing platform; a buffer rubber plate is arranged on the inner side of the protective layer in the longitudinal bridge direction; a polytetrafluoroethylene plate is arranged on the inner side of the protective layer in the horizontal bridge direction; the seismic isolation support consists of a lower connecting steel plate, a lower sleeve, a lower anchor rod, a lower anchoring bolt, an upper connecting steel plate, an upper sleeve, an upper anchor rod, an upper anchoring bolt and a support body which is positioned between the lower connecting steel plate and the upper connecting steel plate; and the support body is formed by bonding a rubber sheet, protective layer rubber, a stiffening steel plate and a support connecting steel plate in a lamination vulcanization mode. According to the seismic isolation foundation, due to the seismic isolation function of the seismic isolation support, a bridge beam structure above a seismic isolation layer is isolated from a horizontal seismic oscillation component, so that the seismic performance of the bridge is improved.

Description

Technical field: [0001] The invention relates to a bridge foundation form, in particular to a bridge seismic isolation foundation. Background technique: [0002] Earthquakes are natural disasters that cannot be accurately predicted, and bridges are lifeline projects for transportation. Improving the seismic performance of bridges and ensuring the seismic safety of bridges will directly affect the effects of earthquake relief and post-disaster reconstruction, and are closely related to the success or failure of the urban disaster prevention and mitigation system. [0003] At present, in the construction of long-span bridges in my country, a large number of pier-beam consolidation types are used, such as continuous rigid-frame bridges, low-tower cable-stayed bridges, etc., to reduce the use and maintenance of large-tonnage bearings. However, the available seismic strategies for these long-span bridges are extremely limited. If the strength design method is used, it is often ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that foundation isolation cannot be achieved in bridge pile foundations, so as to improve the seismic performance of long-span pier-beam consolidated bridges, which not only ensures the normal operation of the bridge, but also significantly reduces the seismic action transmitted to the bridge

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