The large-sized silos for coal of thermal power plants are under construction at Tachibana-cho, Anan-shi in Tokushima prefecture. The lift-up method is adopted to erect the roof structure located on top of the silos. This method is one of very effective erection methods of steel structures because of improvement of safety for erection and reducing materials for temporary supports. In this project, the working space is so small at the top of silo that it is difficult ot set up the lift-up equipment. To solve the problem we developed the new jack supporting system using the characteristic that the cylindrical shell is able to resist for bending force out of plane direction. This paper reports the developing of the new jack supporting system in the lift-up method.
