Speed locking device for seismic resistance of bridge

Abstract

The invention discloses a speed locking device for the seismic resistance of a bridge. The speed locking device comprises a piston rod, a piston, a cylinder and end covers, wherein the middle part of the piston rod is in threaded connection with the piston; the piston is arranged in the cylinder; the piston rod, the end covers and the cylinder form a closed cavity in which the piston can move; and a certain annular gap is formed between the piston and the cylinder, and a special damping medium is filled into the annular gap. The speed locking device is simple in structure and high in performance; ways of dustproof rings, dual-lip sealing rings, O-shaped rings, buffer sealing and the like are adopted, so that the device has a good sealing effect, and is high in abrasion resistance, high in extrusion resistant capability, resistant to impact load, small in compression deformation and easy to mount; under a normal load condition, the speed locking device does not perform locking and produce detrimental resistance to an external component, and the piston can normally move in the cylinder; and when encountering a burst external excitation load, the speed locking device performs locking, and provides temporary rigid connection to connect a bridge body with bridge piers, so that all the bridge piers share the load to fulfill the aim of protection.

Description

technical field [0001] The invention relates to a speed locking device, in particular to a speed locking device for generating temporary rigid connections when a large continuous girder bridge bears sudden loads such as earthquakes, and belongs to the field of bridge anti-seismic technology. Background technique [0002] In recent years, with the construction of large bridges and the frequent occurrence of external disasters such as earthquakes and strong winds, people are paying more and more attention to the safety of these buildings, and more and more large buildings are using various forms of anti-seismic devices To reduce the losses caused by earthquake disasters. The current anti-seismic devices are mainly dampers that provide high damping force. This type of damper can dissipate energy, but does not provide locking force; and it is more suitable for floating systems such as large suspension bridges and cable-stayed bridges. For simply supported beams and Continuous g...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a speed locking device that can be used to provide temporary rigid connection for large simply supported girder or continuous girder bridges when they are subjected to sudden loads. Move slowly, and provide limit and anti-seismic effects during earthquakes; thus effectively solving the deficiencies in the existing anti-seismic technology of simply supported beams and continuous beam bridges

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