Lateral Pressure Study And Structure Optimization Of Steel Structure Climbing Formwork Used In The Large Angle Bridge Tower

Abstract:Automatic hydraulic climbing formwork system is advanced machine and equipment which is used in the bridge construction to make bridge tower shape. At present, the application and research of climbing formwork is just limited to vertical climbing formwork. The research of climbing formwork used in the large angle bridge tower is rarely involved and the calculation of template lateral pressure is no explicit. This paper in view of the lateral pressure and the structure of the climbing formwork, research the project design, the template lateral pressure, stiffness of climbing formwork and structure optimization, etc. The main contents and innovation points of this paper are:(1) This paper analysis the structure, determine the construction process, point out the main key technologies of large angle climbing formwork and design the total scheme of this machine. Then study the work condition of large angle climbing formwork.(2) This paper describes influence factors of lateral pressure and establish simulation model of template lateral pressure. Then simulated analysis the template lateral pressure and get the calculation method of template lateral pressure.(3) Through experiment collected the lateral pressure data of the template in the construction project of Huaibei Xiangwang Bridge. Then get the lateral pressure curve, the experimental results and simulation results are similar. The maximum lateral pressure in the down surface is55.68KN/m2and it is53.64KN/m2in the upper surface. The maximum error is only2.6%, which deduces that the simulation model is reliability and accuracy.(4) Through the finite element simulation software, analyzed the strength and stiffness of climbing formwork in work condition, get the dangerous stress concentration area and maximum deformation position of climbing formwork, which provides reference for design and structure optimization of climbing formwork. (5) Establish the parametric modeling of climbing form bearing system and carry on the structure optimization. The total mass optimized of bearing system is decreased by6.4%. And the stress distribution is more uniform and the maximum stress is reduced nearly23.4%.