| As the development of modern transportation continues to accelerate,the traffic volume increases year by year,the total traffic mileage and route network density increase year by year,and the use of overpasses is also increasing.In order to reduce the impact of the bridge under construction on the existing route,try to ensure the normal and safe operation of the original line,and ensure that the construction of the bridge under construction can be carried out simultaneously,the bridge rotation construction technology emerged and developed rapidly.The rotating system is the core force part in the rotating construction,and the rotating spherical hinge is the most important component of the rotating system.In view of the fact that the current research on the force of the contact surface of the RPC spherical hinge is not deep and sufficient,and there are few related references.Based on the(2×85)T-shaped rigid frame cross-railway bridge,this paper analyzes the key technologies through the horizontal swivel construction of the bridge,and analyzes the force of the RPC spherical hinge contact surface.The main research contents are as follows:(1)Study the existing theoretical calculation methods of spherical joint contact stress,analyze the principles and differences of the theoretical calculation methods,compare the theoretical calculation results with the actual measured values,optimize the spherical joint contact stress algorithm,and the optimized algorithm can replace the non-Hertz theory for spherical joint contact Stress calculation,the calculation result basically meets the strength requirements of the contact stress of the spherical hinge,and the formula of the optimization algorithm has good adaptability.(2)The Abaqus finite element model of the spherical hinge was established,the contact stress change rule was analyzed,and the numerical simulation results were compared with the measured values.The numerical simulation results were accurate and reliable.Research the key parameters of RPC spherical hinge,analyze the influence of the change of the vector height and plane radius of the spherical hinge on the contact stress,and find that both the vector height and the plane radius have a greater influence on the contact stress of the spherical hinge;study the spherical hinge under different eccentricity Contact stress and contact state.(3)Study the construction control of the horizontal rotation of the T-structure bridge,carry out the unbalanced weighing test of the horizontal rotation of the bridge,and use the unbalanced weighing principle to calculate the rotation test parameters.Collect weighing test site data,analyze the relationship between jack thrust and spherical hinge displacement,determine the size of the jacking force,and formulate a bridge counterweight plan based on the calculated rotation test parameters.(4)This article summarizes the implementation guide for horizontal rotation of bridges,introduces the rotation system,pre-rotation construction and rotation construction in detail,and provides a useful reference for the horizontal rotation construction of similar bridges. |
