Foldable arch type bridge

Abstract

Provided is a foldable arch type bridge. According to the bridge form, the foldable arch type bridge is a bowstring arch bridge, and comprises two basic structural forms with an arch and a beam combined, and the arch and beam bear loads jointly; a self-balance system is formed through the combined action that the beam bears bending force while the arch bears pressure, a support at the arch end is prevented from generating horizontal thrust, and the horizontal thrust is converted to tension borne by a rod string; and the arch and the string are fixedly connected by being connected with the two ends of a closed framework in a hinged mode. The developable arch type bridge is more reasonable in outline stress and high in material utilization rate. The structural unfolding speed of the developable arch type bridge is far higher than the bridge assembling speed. Construction is convenient and rapid without assistance by large-sized machines. The developable arch type bridge is particularly suitable for solving the problems caused to rescue work by road and bridge destruction and traffic interruption in earthquake disaster regions, and enables vehicles and supplies to move across obstacles fast in emergency circumstances.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and relates to bridge structures, in particular to expandable arch bridge structures. Background technique [0002] In recent years, earthquake disasters have occurred frequently in western China. The earthquake directly caused bridge breakage and road damage, which had a great impact on the rescue work in the disaster area. Deployable arch bridges can quickly restore blocked traffic in disaster-stricken areas, opening a lifeline to rescue. [0003] Most of the existing expandable bridges are truss bridges. Under the moving concentrated load (simulating a moving car), the internal force distribution between the members is uneven, and the material utilization rate is low; most of them need the assistance of heavy lifting machinery, such as foreign military folding bridges. Systematic tactical bridges require diesel engines as a power source, and it is difficult to enter the site in time ...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing expandable bridges are truss bridges. Under the moving concentrated load (simulating a moving car), the internal force distribution between the members is uneven, and the material utilization rate is low; most of them need the assistance of heavy lifting machinery, such as foreign military folding bridges. The system tactical bridge requires a diesel engine as a power source, and it is difficult to enter the site in time in the earthquake zone where the traffic is paralyzed

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