Study On Mechanical Behavior Of Main Outriggers Of Self-stabilizing Bridge Erecting Machine With Sliding Support Function

The innovative research and application of large-scale lifting and erecting construction equipment represented by the bridge erecting machine is the fundamental guarantee for the rapid development and construction of high-speed railway bridges in China,in which the integrated bridge erecting machine plays a key role in the construction of high-speed railway bridges in complex areas such as mountains and tunnels.Among them,the SLJ900 mobile bridge erecting machine independently developed by Shijiazhuang Tiedao University has solved many technical problems in the process of beam erecting due to its leading innovative technology,and is favored by the construction companies.One of the main innovative core technologies of the bridge erecting machine is the ingenious design of its main outriggers,which is the key to ensure the safety,speed and high adaptability of the bridge erecting machine.Its innovative concept has been gradually applied to other beam erecting construction equipment.As the most critical bearing structure of this kind of bridge erecting machine,it is of great significance to study the mechanical performance and action state of the main outrigger under various complex construction conditions.This paper takes SLJ900 mobile bridge erecting machine as the research object,focusing on its unique main outrigger structure system,and carries out the following research work:(1)This paper introduces the technical parameters,structure composition,beam erecting construction process of SLJ900 mobile bridge erecting machine,introduces three core innovative technologies of dynamic support and self stability technology of main outrigger,the driving technology of constant torque of main outrigger,and real-time monitoring technology of safety state of main outrigger.(2)Through the finite element software ANSYS,the bridge erecting machine is modeled,the load and the actual working condition are sorted out,the mechanical behavior of the main outrigger of SLJ900 mobile bridge erecting machine in the flat and longitudinal slope conditions are analyzed,the slip of the main outrigger and pier is judged,and the influence of the longitudinal slope on the main outrigger force is explored.This paper studies the practical application of the driving technology of constant torque of main outrigger,real-time monitoring technology of safety state of main outrigger and dynamic support and self stability technology of main outrigger.(3)The change of mechanical behavior of the main outrigger structure under the action of different inclination degree and different hole position of the main column is compared,especially the stress change of the upper and lower stress monitoring points of the inclined rod,and the damage degree of construction under this working condition is clear.(4)When the plane angle of the rear frame and the main beam changes within ±0.5°,the stress of the main column of the main outrigger,the overall horizontal rotation trend and the stress change of the PTFE slider on the main outrigger underlay beam are explored.Through the above research,the mechanical behavior change rule of the main outrigger of the bridge erecting machine under different working conditions is obtained,the possible dangerous working conditions and dangerous position control points in the construction process are clarified,the stress characteristics of the main outrigger of the bridge erecting machine in the actual construction are mastered,which is helpful to improve the safety of the site construction of the bridge erecting machine,and lays the foundation for the next research and design of the thousand ton bridge erecting machine.