Abstract
In the highways of mountainous areas, the erection of the large-span reinforced concrete box-type arch bridges using the cantilever casting method has unique advantages due to its adaptability to those environments. However, what prevents engineers from choosing this design in practice is that, the efficiency, cost, and safety problems resulting from the defects of the temporary facilities, which are due to the span increase, may immediately make the scheme less attractive. To fully consider the merits of this bridge type, new techniques of the temporary facilities are developed. A new form traveler based on the feathers of such arch rings is invented to promote erection efficacy; this new form further facilitates the technical upgrades of the buckle-anchor system monitoring-control and temporary prestressing design, which together eliminate the difficulties brought by the span increase. The inverted-type triangle traveler composed of tiled main truss structures, with the walking hook and anchor tie rod detached, is used to achieve space adaptability, light weight and modularization. The semiautomatic deviation-rectifying system, which combines the technologies of real-time data collection of the buckle pylon deviations and automatic synchronized tensioning, is developed to ensure the safety of the buckle-anchor system. The temporary short prestressed tendons are designed for control of the arch ring tensile stresses. The effectiveness of the technical upgrades has been demonstrated in the construction application of the Shatuo Bridge in Guizhou, China, which provides a promising alternative for the construction of large-span box-type arch rings of concrete arch bridges with a low cost, high efficiency, and high safety assurance.
Highlights
In mountainous areas, such as in Guizhou, China, the concrete arch bridge is one of the most popular design schemes in highway construction. is is due to its superior durability and because of the environment adaptability of its construction methods [1,2,3]
When the arch ring span is lower than 120 m, the scaffolding method [4] and the steel arch frame method are mostly used for such bridges, with few adopting the rotation construction method [5]
With the proposed technical upgrades for the temporary facilities of the concrete box-type arch bridges, the main arch ring of the Shatuo Bridge achieved closure in November 2018, and the line shape and stresses were successfully controlled. e contributions of this case study can be concluded as follows
Summary
In mountainous areas, such as in Guizhou, China, the concrete arch bridge is one of the most popular design schemes in highway construction. is is due to its superior durability and because of the environment adaptability of its construction methods [1,2,3]. The methods for dealing with the technical and design upgrades of the temporary facilities during the main arch ring construction constitute the most important factor in the erection of large-span concrete box-type arch bridges [1]. By solving these technological issues can the designed structural shape and internal forces be efficiently achieved within a reasonable cost and safety range. A new form traveler based on the feathers of such arch rings was invented to promote the erection efficacy, which further facilitates the technical upgrades, in terms of both the buckle-anchor system monitoring-control and temporary prestressing design in order to eliminate the difficulties brought by the span increase.
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