Encofrado perdido para forjados U-Bahn Beton

6 U-Bahn Beton® o alleggerimento in polistirene? Even if polystyrene is widely used in the construction industry due to its low cost and workability, it has many disadvantages that are being addressed by the technical-scientifi c community. With reference to lightened slabs, the Italian Ministerial Decree of 16.02.2007 to enclosure D.5.1 establishes that: “In the case of polystyrene formworks, or formworks in similar materials, there must be appropriate vents for the overpressures”. Even prior to this, the UNI 9502 standard - article 7.2.2 - established that: “In the case of elements incorporating materials that when subject to high temperatures turn to gas, there must be appropriate vents facing the side exposed to fi re to ensure that the bearing capacity is not compromised by explosions”. Therefore, using polystyrene slabs cast on site requires the extra expense of fi tting vents in the cavity to counteract the excessive pressure of gas that is sublimated by the formwork. However, in the event of a fi re there would still be the problem of toxic gas escaping into the environment (styrene). As U-Bahn Beton® is made of polypropylene, it is not toxic even if burnt. Moreover, the slab will not explode due to the escaping of over pressurised gas from the feet (4 every 20 cm of the formwork) that act as safety valves. Other advantages of U-Bahn Beton® compared to EPS are the dimensions, handling (just think of transferring it overhead on the slabs being built) and outdoor storage. Polystyrene is, in fact, bulky and cannot be stacked; it is particularly fragile on its edges and corners that crumble leaving those annoying balls that, statically charged, stick to everything (especially to the reinforcements) and are very hard to get rid of. Daliform Group technical offi ce The technical consultancy is only valid for the Daliform Group construction systems. To contact the technical office: Tel. +39 0422 208350 - tecnico@daliform.com To obtain updated technical cards, support material, new photos and case studies, go to www.daliform.com SUPPORT FOR THE EXECUTIVE DESIGN Support by design professionals. Upon request, the formwork positioning plan can be supplied with a list of the products required to carry out the work and the relative accessories. FEASIBILITY STUDY Predimensioning and optimisation of the structures, comparative and/or revised proposals, material and manpower estimates, cost analysis. Evaluation of forced ventilation in the case of cold rooms. ON-SITE SUPPORT If necessary, our technical staff can be present on-site to help the construction company during the operational phase. CALCULATION REPORT Reports certifying the execution of Daliform Group constructive systems. The information contained in this catalogue could be changed. Before placing an order, request a confi rmation or updated information from the DALIFORM GROUP, which reserves the right to make changes at any moment without notice. In consideration of recycled material, it is specifi ed that there are tolerance margins caused by environmental factors. www.baygar.com