Rotation Construction Control Technology of Diaozhongyan Arch Bridge with Rigidity Steel Skeleton

Based on the actual construction condition of Diaozhongyan extra-long bridge,improved plane rotation technology is adopted in the joining of the arch bridge with rigidity steel skeleton.Then the skeleton acts as the bracket to proceed with the construction of arch upper-structure.The plane rotation axis system adopted for the bridge is composed of plane rotation axis,inner and outer safety legs and plane ring slideway.Based on the actual structure of the bridge,space finite element model is established.According to the practical construction and loading sequence of bridge structure,the stress and deformation of structure are calculated by means of finite element analysis software ANASYS.During the actual process of construction,stress monitoring is done by the contrast analysis between the practically measured values and the calculated values of the stress and deformation on fixed position at each construction phase so as to guarantee the actual stress and deformation of the structure within reasonable control range.The measured value basically agrees well with calculated value,which indicates that structure stress and deformation are well controlled during construction.Construction results indicate that the improved plane rotation technology is suitable for the construction of such arch bridge with rigidity steel skeleton.