超大跨度双跨机库局部加强及提升施工技术研究OA

During the construction process of the steel roof structure of a large-span maintenance hangar,in-situ assembly on the ground with two-stage cumulative lifting is an economical and efficient construction method.Nowadays,the double large-span span hangar in the field adopts the technology of installing lifting frames on the top of the three support columns and temporary lifting towers at the gate opening.Temporary tower structures require high foundation bearing capacity,while reclaimed land typically has low bearing capacity.The foundation construction for the tower is relatively difficult,and the original technology cannot meet the on-site construction requirements.Therefore,a new construction technology is needed to solve the installation of the steel roof of the hangar in soft foundation areas.Based on the practice of the Xiamen Xiang'an Taigu 2 Maintenance Hangar Project,a technique involving partial strengthening of the gate truss and non-temporary-support lifting was proposed and adopted for the first time.This technology adjusts the layout of the gate truss structure to eliminate the need for temporary lifting towers at the gate opening,and uses existing structural columns for lifting.This makes the boundary conditions in the construction state as consistent as possible with those in the design state,thereby minimizing the impact of the construction process on structural stress.Through the simulation analysis of the whole construction process,the steel roof assembly and pre-deformation measurement were conducted,and the sections of about 3.6%of the members were fine tuned.Through new construction techniques,the problem of foundation treatment for hangar construction in soft foundation areas can be solved.This type of construction method is simpler than traditional techniques and has good economic benefits,which can provide a reference for similar engineering construction.