Mechanical Property Analysis And Structure Optimization Of Variable Formwork System Of Steel-shuttering Trolley In Curve Section

The steel-shuttering trolley is a kind of large non-standard mechanical equipment used in tunnel secondary lining construction.The traditional steel-shuttering trolley is designed and manufactured with a fixed tunnel section size,which cannot adapt to the tunnel lining environment with a variety of section sizes.However,the variable type steel-shuttering trolley has the functions of varying height,span and arc,which can meet the complex and changeable lining requirements of tunnel section size by adjusting its structure.Curve section variable steel-shuttering trolley is mainly used in variable bending tunnel lining environment,but the structure of the trolley is more complex than the traditional steel-shuttering trolley,and the designer often takes too large safety factor,which leads to too large volume and mass of the trolley.Based on the curve segment variable type steel-shuttering trolley as the research object,from the construction safety,save material,reduce engineering cost point of view,on the car template system based on the load calculation,intensity and analysis,is verified by template static and dynamic and stability analysis of the template system reliability,and the lightweight optimization design.The main research contents are as follows:(1)Curve section variable steel-shuttering trolley structure brief and formwork system mechanical analysis.Firstly,the structure composition and three-variable principle of the variable steel die trolley in the curve section are introduced.Secondly,according to the concrete mechanical properties change over time,the car lining construction process is divided into concrete initial setting before,on both sides of the concrete filled after vibration,three kinds of working condition of the concrete pouring,the template system is calculated under the working condition of each,respectively,carries the load,and using the theory of classical mechanics to calculate the deformation and stress of casting to complete background car template system value;Thirdly,taking the TC4635-Q mould trolley as an example,the model of the maximum size of the trolley was established by CREO software,and it was imported into ANSYS Workbench software for static and dynamic analysis.Finally,by comparing the statics analysis results with the traditional mechanical calculation results,it is verified that the stiffness and strength of the pallet formwork system meet the operating requirements.(2)Stability analysis of adjustable arch girder with variable steel-shuttering trolley in curve section.Firstly,the three-dimensional model of the adjustable arch beam with the maximum span is established,which is imported into ANSYS software to verify the reliability of the adjustable arch beam.Secondly,based on the results of the static analysis of the arch beam,the theoretical calculation model of the arch beam is established,and the buckling load of the most unfavorable part of the arch beam is analyzed.Thirdly,using ANSYS Workbench software,the nonlinear buckling analysis of the three-dimensional model of the arch beam is carried out.The analysis results are compared with the theoretical calculation results,which verifies that the arch beam has good stability.Finally,based on the orthogonal experimental design method,the influence of the adjustable arch beam span,arch height and the structure size of the two supports with the span of 3m,4m and 5m is analyzed.The results show that the span is a significant factor affecting the stability of the arch beam structure.(3)Lightweight optimization design of variable formwork system of steel-shuttering trolley in curve section.Firstly,a single standard template was selected as the optimization object,and its internal layout and size were optimized and adjusted by topology optimization and multi-objective size optimization.Secondly,taking the maximum span specification of the adjustable arch girder as the optimization model,the response surface analysis was carried out using ANSYS Workbench software.By analyzing the three-dimensional relationship between the thickness of the triangular plate and the mass of the arch girder,and the maximum displacement and stress,the lightweight optimization model of the adjustable arch girder was designed.Finally,a prototype for the optimization model for this template,adjust the structure of the rest of the template size,combined with the light beam model car template system optimization model is established,and through the comparative analysis with the initial template system analysis results,the results show that the optimized template system overall quality reduced 22.73%,the better to achieve the lightweight.