Research on Construction Technology of Prestressed Concrete Continuous Box Girder Platform

Abstract

The design of large-scale cast-in-situ box girder platform has always been the focus of continuous beam construction, which includes such problems as whether the temporary support system can meet the requirements of bearing capacity, how to design an appropriate system according to the actual situation of the site, how to install and remove supports. The function transformation of the jacking support platform should be carried out in two stages. The beam making platform of the jacking beam should not only meet the requirements of cast-in-situ, but also bear the horizontal thrust in the jacking process, and the jacking process itself has higher requirements for the flatness of the beam bottom. Therefore, the design of jacking support structure needs to start from beam making ↦ jacking, and pay more attention to the function of jacking. Based on the stress requirements and stability requirements of the support, two schemes are adopted, namely the support structure design based on prefabricated stress and the support structure design based on jacking stress. The optimal scheme is selected through comparative analysis.