Deformation monitoring during removal of the supporting of T-type rigid frame bridge constructed by rotation method

Rotation construction of a bridge is an effective construction method, when a bridge across the highway, railway, river, canyon, or other special conditions such as existing building. First of all, beams are manufactured to the shore, or on side of the existing building, or on both sides of the existing traffic routes, and then beam is rotated to the design location along the spin axis. T-type rigid frame bridge is a cantilever beam after removing of the supporting; and its overall stability depends on the ball joints in the event of rotational friction and the support feet. From a structural point of view, the bending moment at the free end of cantilever is zero, while the largest at the root. The force system of the structure is changing during removal of the supporting. On-site monitoring of deformation process was carried out to master the development of the deformation. Numerical calculation of Ttype rigid frame bridge was carried out to simulate the supporting-removal process of bridge construction, and then deformation at some key sections was obtained. Some conclusions are obtained to give reference for construction and controlling of the bridge.