A trigger-type anti-seismic double block device for bridges

Abstract

The invention discloses a trigger-type anti-seismic double block device for a bridge, which comprises a concrete block formed by extending upwards at both ends of a cover beam, and a pre-embedded steel plate is arranged inside the concrete block; on the cover beam between the concrete block and the main beam The surface is fixed with a steel box, and the steel box is provided with an opening that penetrates up and down. A short stop is inserted in the opening, and the length of the upper end of the short stop protruding from the steel box is greater than the depth of the pit; the bottom of the steel box deviates from the hole And the upper surface of the cover beam that is biased to the outside of the bridge is provided with a pit with a size slightly larger than the cross-sectional size of the short stop; there is a gap between the steel box and the main beam, and an elastic-plastic deformation device is fixed between the steel box and the embedded steel plate. The invention can make the upper structure of the bridge have a self-resetting function under the action of medium and small earthquake loads, and can effectively dissipate the seismic energy under the action of strong earthquakes and trigger the second stopper to participate in earthquake resistance, thereby reducing the occurrence of lateral beam falling accidents, thereby improving The seismic performance of the bridge structure is improved, and the manufacturing layout is simple and the cost is low.

Description

technical field [0001] The invention relates to the technical fields of bridge anti-seismic and bridge anti-seismic isolation, in particular to a trigger-type anti-seismic double block device for bridges. Background technique [0002] Our country is a country with many earthquakes. Earthquakes not only bring huge loss of life and property to people, but also bring more secondary disasters. Due to the lack of anti-seismic performance and improper selection of anti-seismic measures, the bridge structure has been repeatedly damaged to varying degrees. This not only creates some obstacles for earthquake rescue, but also makes the post-disaster reconstruction work very difficult. In previous earthquakes, the block was damaged due to insufficient earthquake resistance, and even a transverse beam falling accident occurred. Therefore, in the study of the damage mechanism of bridge earthquake disasters and the seismic design of bridge structures, how to design bridge blocks to preve...

AI Technical Summary

Problems solved by technology

[0003] Under the action of strong earthquakes, large seismic displacements are likely to occur between the upper and lower structures of the bridge in the transverse bridge direction, and the main girder will collide with the transverse stopper, resulting in the destruction of the stopper, and in severe cases, the transverse girder drop

After reading a large number of documents, bridge block patents and many field investigations, the applicant found that the functions and scope of application of many blocks are relatively single, and they are poor in self-resetting, multi-level fortification and dissipation of seismic energy. Achieving multiple functions often requires several measures to complete, which not only increases the cost and layout space to a large extent, but also makes the entire block structure appear bloated and complicated

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