Winding cable fall prevention beam device for new bridges

Abstract

The invention relates to a winding cable anti-drop-beam device used for a newly built bridge. The device is characterized by being arranged between a beam body and a capping beam and comprising the following components. Two anchors are fixed on the top surface of the capping beam. A friction shaft is fixed between the two anchors. Two beam limiting blocks are fixed on a beam body. A friction cableis wound for a plurality of rounds on the friction shaft, and after a pretightening force is applied, two ends of the friction cable are respectively connected with the two beam limiting blocks. Under a normal state, static friction force between the friction cable and the friction shaft can satisfy pier beam relative displacement caused by vehicle brake and stretch-out and draw-back of the beambody caused by temperature, the static friction force being generated by applying the pretightening force. Under an earthquake, through friction sliding with the friction shaft, the friction cable consumes energy which is input to the structure by earthquake, and play damping and aseismic roles. The limiting blocks play a role of limiting excessive displacement of the beam body. Under an ultimatestate, a friction cable force is smaller than beam body earthquake load effect, the beam limiting blocks and friction shaft anchors collide, to limit excessive relative displacement of piers and a beam body.

Description

technical field [0001] The invention relates to a novel anti-drop beam device, which is suitable for new structures of highway bridges, urban viaducts and various large-scale continuous beam bridges. The utility model can effectively limit the relative displacement of the bridge pier and the main beam under the action of earthquake, improve the overall seismic performance, and belong to the field of bridge structure reduction and seismic resistance. Background technique [0002] my country is a country prone to earthquakes, with high frequency, high intensity, and wide distribution. Several catastrophic earthquake disasters occurred in recent years have caused great loss of life and property to the Chinese people. As one of the lifeline projects, bridges play a vital role in earthquake relief and post-disaster reconstruction. [0003] In destructive earthquakes, the excessive displacement of the bridge superstructure and the damage of falling beams are common. In the Wenc...

AI Technical Summary

Problems solved by technology

However, the construction quality of the above anti-fall beam devices is poor, the reliability is not high, it is easy to be damaged in an earthquake, and it is not easy to repair and replace. Some anti-fall beam devices are expensive and the anti-seismic effect is not obvious

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