Self-compacting concrete jack-up pouring construction method for steel tube arch bridges

Abstract

The invention discloses a self-compacting concrete jack-up pouring construction method for steel tube arch bridges. The self-compacting concrete jack-up pouring construction method mainly includes a construction method of pouring concrete to a main arch from arch feet of the main arch. With the self-compacting concrete jack-up pouring construction method, the difficult problem about concrete pouring of the steel tube arch bridges is solved, the concrete of the main arch of the arch bridges can be poured rapidly, conveniently and effectively during construction, time for continuous operation of concrete pouring is greatly reduced, and structural mechanic performance required by design of the steel tube arch bridges is met; meanwhile, a brand new mix ratio of self-compacting concrete is given out, so that the difficult problems about resistance produced by longitudinal stiffeners and radial stiffening rings inside the arch as well as dense spacing among vertical stiffening rings at the positions of suspenders during jacking-up and pouring of steel tubes are solved, the mix ratio of the self-compacting concrete of the steel tube arch bridges is specially designed, and demands of good workability, initial setting time being in conformity with pouring of arch ribs and performances of no bleeding, no segregating, small slump loss and the like are met.

Description

technical field [0001] The invention is used in the field of concrete construction, and in particular relates to a self-compacting concrete jacking pouring construction method for a steel pipe arch bridge. Background technique [0002] Due to the continuous development of the urban economy, urban buildings have higher and higher requirements for visual effects. Steel arch bridges stand out in the requirements of the era and have sprung up in recent years. However, we should not only see the beauty of steel arch bridges, but ignore In order to ensure its safety in use, the main stress structure of the steel arch bridge is the steel tube concrete arch structure. However, the difficulty and focus of the construction of this part is the compactness of the concrete. In the past, there were often gaps in this part of the steel tube arch bridge. It is greatly reduced, making it a potential safety hazard, so it is very important to solve the problem that concrete is difficult to vib...

AI Technical Summary

Problems solved by technology

[0004] In the steel arch bridge mentioned above, since the segment of the steel pipe arch bridge is a linear long structure with a relatively large diameter, if only traditional vibration methods are used, such as plug-in vibration, plate vibration, etc., in the process of pouring concrete, It is difficult to meet the compactness requirements in the middle and top of the steel pipe, so that the mechanical performance requirements of the structure cannot be met, and the safety requirements of the structure cannot be met naturally.

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