Encofrado perdido para forjados U-Bahn Beton

7 Positioning The entire surface of the slab to be cast on site is shuttered with wood deck (or similar systems), then the welded reinforcement irons and mesh are positioned according to the design and the spacing lattice for the upper reinforcement is arranged. The positioning is completed by closing the open fi nal ends of the U-Bahn Beton® formwork with a lateral closing plug above which the reinforcements, welded mesh as well as the instruments for cutting and punching are positioned according to the design. Once suitably set, the casting can be restarted from the starting point, completely burying the U-Bahn Beton®. The casting is then levelled and smoothed in a traditional manner. The U-Bahn Beton® formworks are positioned with the desired centre distance that will determine the width of the beams. Thanks to the conic elevator foot, the U-Bahn Beton® formworks will be lifted from the surface, making it possible for the lower slab to be formed. The systems will be arranged in the internal cavities of the formworks. The concrete casting must be performed in two phases to prevent the fl oatation of the formworks: an initial layer will be cast to form a thickness equal to the height of the elevator foot. Casting will continue for this fi rst portion of the slab until the concrete starts to set and become less fl uid. Once the structure has hardened, the formwork can be removed. The surface is smooth in correspondence of the soffi t. REINFORCEMENTS SIDE SHUTTERING PROP SPACER PILLAR FORMWORK PVC UTILITIES SIDE SHUTTERING PROP SPACER PILLAR FORMWORK PILLAR BACKPROPPING REINFORCEMENTS SIDE SHUTTERING PROP SPACER TRADITIONAL SHUTTERING IN WOOD OR METAL LOWER REINFORCEMENT PILLAR REINFORCEMENTS SIDE SHUTTERING PROP CLOSING PANEL SPACER PILLAR FORMWORK UPPER REINFORCEMENT SIDE SHUTTERING PILLAR PROP 1 3 5 2 4 6 Photographic details of the complete positioning, reinforcing and casting sequence. www.baygar.com