Construction method of ultra-wide main arch ring of long-span hollow arch bridge in alpine region

Abstract

The invention relates to a construction method of an ultra-wide main arch ring of a large span open-spandrel type arch bridge in extremely-cold regions. The construction method mainly comprises the following steps: leveling the construction field, inserting and piling recyclable short steel pipe piles, pouring concrete foundation beams, splicing beret slices to form beret posts and columns, erecting a cuplock steel pipe shelf, laying the bottom template of the main arch ring, binding the steel reinforcement framework of the main arch ring, mounting a temperature adjusting pipe network system, pouring concrete to the main arch ring by segment, heating, and curing, pouring concrete to the interval grooves and post-cast strips, grouting the temperature adjusting pipe network system and removing the template supporting system. The template supporting system of the ultra-wide main arch ring of the large span open-spandrel type arch bridge and the concrete pouring and curing method in extremely-cold regions can ensure the concrete pouring quality of the main arch ring, accelerate the construction speed, reduce the project cost, and achieve better technical and economic benefits.

Description

technical field [0001] The invention relates to a construction method for an ultra-wide main arch ring of a large-span fasting arch bridge in an alpine region, which belongs to the field of bridge engineering and is suitable for formwork support, concrete pouring and maintenance of the main arch ring structure of a large-span and ultra-wide fasting arch bridge in an alpine region. Background technique [0002] Arch bridge is a common bridge structure with a long history of development. It is widely used in various bridge projects because of its beautiful line shape, good mechanical performance and excellent spanning ability. Especially under the background of the country's implementation of the western development, a large number of infrastructure such as highways and high-speed railways have been built. More and more arch bridges are favored by engineers and owners as spanning structures, and they have been successfully applied to actual projects and achieved good results. ...

AI Technical Summary

Problems solved by technology

For the construction of the main arch ring of the long-span and ultra-wide arch bridge in the western gullies and canyons, the cantilever construction method has high construction requirements, strict control measures, and poor economy. The landform under the arch has high requirements, and the steep surface increases the difficulty of scaffolding, and the large span and ultra-wide conditions of the arch bridge will significantly increase the use of scaffolding

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