In high buildings, the outer floor is placed between the flooring to be able to leave or receive material with crane. Main girders are supported with H20 wooden beams or wooden beams. The railings around the platform are covered with wood. The height can be adjusted with the special setting of the spindles to be able to put between the slab. The height of the platform can be adjusted with the four-heads which are used by the H20 wooden beams used in the main girder according to the height of the slab edge beam. Platform working surface is 360cm x 350cm and is covered with 5cm thick woods on H20 wooden beams used in the main girder. Workers are safe from falling during work. Vacancies are left in place to assist in transporting the crane rings. When climbing with a crane, workers should not be above or below safety for safety. It is transported to upper floors and final floor without demounting by crane.