Lifting frame， also know as jack or Door frame, "L" word frame. Its function is to prevent the template from lateral deformation. During the slip-form process, it passes all the vertical load to the jack, in the same time, combining the template with Operation Platform System. This lifting frame uses 20” channel steel as beam and upright post to form “ door” shape, in order to strengthen its rigidity. Under the beam, we use 50×5 steel with 450 degree angle to weld with the upright post. Upon the beam, we use D48 steel as the steel guide bar.