Research On Key Technologies Of Steel Box Girder Construction By Step-Up Pushing Method

With the accelerating construction speed of highway engineering and the large number of large-span bridges,there are often problems in the construction process,such as manufacturing sites,transportation modes,hydrological conditions,and navigation.The jacking method has been widely used in bridge construction due to its unique advantages,and the construction technology is becoming mature.The commonly used jacking methods are multi-point dragging continuous jacking construction,multi-point self-balancing wedge-type jacking construction,and multi-point self-balancing walking type pushing method construction.At present,there are many domestic applications with multi-point drag-type continuous push-push method.Due to its high construction cost,slow speed,poor protection of the finished beam and poor precision of thrusting,it is gradually being multi-point self-balancing.Push construction instead.Based on the supporting project,this paper studies and analyzes the design scheme,construction technology and monitoring methods of the multi-point self-balancing walking type pushing method applied to the steel box girder construction,overcomes the practical application difficulties,and effectively improves the construction quality and efficiency.Reduced construction costs.In this paper,according to the actual construction situation of the project,combined with the construction characteristics of the multi-point self-balancing walking type pushing method,the construction steps are reasonably formulated and the construction stage is divided.At the same time,aiming at the practical application of the multi-point self-balancing walking type pushing method,detailed research and analysis are carried out to solve the design and construction problems of the large-leaf structure such as the lifting beam,the pushing platform and the temporary pier,and it is used for the actual engineering to test the effect.After determining the design and construction plan of the Large temporary facility,the multi-point self-balancing walking type pushing pushing technology is developed,considering the influence of structural line shape,construction site and other factors on the pushing,and correspondingly improving the pushing equipment and process.Improve construction efficiency.Construction monitoring of the push-up method is an important part of ensuring construction safety and quality.In this paper,according to the construction characteristics of multi-point self-balancing walking type pushing method,the force safety of the Large temporary facility,the settlement of the foundation foundation,the vertical elevation of the main beam and the lateral deviation are monitored,and the steel box girder is topped according to the monitoring results.Push the line to control.