Research and Application of Integrated Bending and forming of Arc-Shaped Rebar Meshes in Bridge Towers

Abstract

In this study, an integrated bending and forming technique for super-sized arc-shaped rebar meshes in bridge towers. Specifically, given the forming characteristics of arc rebar meshes, a theoretical model for pre-bending and springback of single rebars and a correction model for integrated pre-bending and springback of rebar meshes are proposed; experiments are performed on pre-bending and springback of single rebars, and the result is found to agree with the theoretical model; through experiments on the integrated pre-bending and springback of rebar meshes, the correction coefficient of the correction model is obtained. The proposed technique has been applied to a real-world engineering project: with the Longtan Yangtze River Bridge as the study case, this paper develops a flexible manufacturing line for rebar meshes and realizes packaged technologies for industrialized construction of reinforcement segments based on the proposed technique, which substantially improves the construction efficiency and molding quality of reinforcement segments in bridge towers.