Construction monitoring analysis on concrete continuous beams across Hanyi Expressway

Abstract

The Han-Yi high-speed railway bridge is a concrete continuous beam bridge, of which the Han-Yi expressway on the upper span is a (40 + 64 + 40) m two-line continuous beam, and the crossing distance between the center of the left line and the highway is DK1254 + 228.63. The intersection angle is 85 degrees. In order to ensure that the bridge closes smoothly, this article uses the finite element software Midas / Civil to build a finite element model, adopts a cyclic feedback construction monitoring scheme, and implements the control of the cross-section stress and deflection of the main beam in real-time during construction and feedback. In the whole construction process, the main beam elevation and stress are used as the main control indicators. The elevation mainly controls the line shape to ensure that the final bridge line shape and the design line shape are consistent; the stress is mainly found in a timely manner through the regular monitoring and analysis of abnormal conditions that may exist in the construction, and early warning is provided to ensure construction safety.