| Bridges are one of the most important components in China’s infrastructure construction process.Since the development of bridge technology,cantilevered continuous bridges have occupied the main position in the construction method.Its structural advantages are outstanding,rigidity and strength,higher material efficiency,and easy maintenance,good shock resistance,simple and generous shape.The most important engineering equipment for the cantilever pouring construction of the bridge is the hanging basket.As the most important equipment,the strength,rigidity and stability of the hanging basket structure will affect the safety of the constructors and the overall project quality.Based on this,relying on the Tianjin Haihe Bridge,this paper designs a new type of walking basket track,which can make the basket walk faster and safer.The paper analyzes the force of the diamond-shaped basket running under different working conditions.According to the simulation and calculation results,the suitable cradle modification plan for the project was proposed and verified,and the structure of the cradle component was optimized,reducing weight and saving costs.The research content of this article mainly includes the following aspects.(1)Summarize the development situation of hanging baskets in China and abroad,outline the types of hanging baskets,summarize the current problems in the market,and put forward the direction and goals for the development of standardization and new-style structural design of the hanging basket equipment in the future.(2)Designed a new type of hanging basket walking track,which was made of polymer material,with high strength,good compression and shear resistance.The new type of rail can be used to realize the hanging basket walking more conveniently.A mechanical test was carried out on the monolithic track,and the tensile strength,compressive strength and impact strength of the material were tested.The finite element simulation of the monolithic track was carried out using Abaqus,and the results showed the strength of the chain plate track made of polymer materials.In line with construction requirements,the maximum deformation of a single-track chain plate becomes 0.087 mm,which verifies its reliability in engineering.(3)The three-dimensional model of the hanging basket was established using Solidworks and imported into the finite element software MIDAS/Civil.According to the actual construction conditions,three application conditions were designed and calculated.The calculation results showed that the components of the hanging basket were subjected to force and deformation Meet the engineering requirements;combined with theoretical mechanics and structural mechanics,assuming the force model of the cradle structure to calculate the stiffness and strength of the cradle components,the results are similar to the finite element simulation results,and the overall error is within 5%,which proves the finite element simulation calculation reliability.(4)According to the finite element calculation results,the strength or stiffness of the hanging basket is analyzed.Most of the components have a performance redundancy of more than 30%,but the rigidity performance redundancy of the main truss CD member is small,and the main truss BC member.The strength performance redundancy of the main truss is small,so the improvement measures are proposed for the main truss components.The front elevation angle of the main truss is changed through MIDAS/Civil finite element simulation.The simulation test found that when the front elevation angle is 20°,the main truss structure is in compliance with the requirements.The steel consumption is the least,and the force of each rod is relatively uniform and reasonable.The optimized construction plan increased the carrying capacity of concrete to extend the pouring section.The finite element simulation found that the various structures of the cradle met the requirements of mechanical performance,shortened the construction period and improved the construction efficiency,and completed the transformation of the cradle. |
PDF Full Text Request