Research Of Cantilever And Rotation Control Technology For T-shape Rigid Frame Bridge

T-shape rigid frame bridge consists of pier and cantilever beam which is consolidated with pier. The most suitable construction method for it is symmetrical cantilever construction. It can simply construct large span bridge without stents,avoiding the interruption of traffic because of substructure construction. It is because of the main advantages of rigid frame bridge clearance under the bridge, and the bridge vision, small dimensions and with less concrete, etc., suitable for the constructions that require large bridge clearance and height restricted bridges. It is very important for the segmental cantilever casting construction then swivel construction, the final closure of the T-shape rigid frame bridge, the final completion of the will experience a long and complex and system conversion construction process, the of construction monitoring. In addition, in the beam to pier consolidation have zero block, the complex stress distribution, easy to crack, so the segment No. 0 local stress analysis is very necessary. In addition, because of complex structure and stress state, so the segment No. 0 local analysis is very necessary. This paper with T-shape rigid frame bridge of Jing Qin Expressway cross the Datong Qinhuangdao railway as the engineering background, of T type rigid frame bridge at cantilever and swivel construction control technology and zero block local stress distribution was investigated. The main works of this paper are as follows:(1) The whole calculational model was established by means of the finite element software Midas/ civil to simulate the construction process of T rigid frame bridge, analyze the deformation, bending moment and stress of the main girder of each construction stage and determine the camber of each beam segment.(2) During the construction period, we monitored the linear and stress of the T-shape rigid frame bridge in each construction stage reasonably. Comparative analysis of various stages of construction stress and linear theory and actual data, to ensure construction safety, the bridge meets the design requirements.(3) According to the goal of swivel construction, supervision contents of swivel points before the swivel monitoring and swivel process monitoring of two parts, including spherical hinge installation, weighing test, twist precise positioning and other content for a swivel construction key technology was studied.(4) The local finite element model of segment No. 0 was established by the Midas/FEA, the particular local stress analysis was made, with the maximum cantilever and completed stage of bridge taken in account of. From the analysis data we can kown that the maximum tensile stress position and guide the construction and provide a certain reference to the design of segment No. 0.