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| One floor added each week with a PERI formwork in Milan  Two new 18 and 19-storey hotel towers with their square-shaped ground plans, dominate the trade fair centre in Milan – opened in 2006, the facility has the largest exhibition area world-wide. The French architect, Dominique Perrault, designed the two 66 and 70-metre high cubatures with five-degree inclinations – this means they incline even more than the famous Leaning Tower of Pisa. The top floors of both highly visible towers are therefore offset by around six metres from the vertical axes. The three and four-star exhibition centre hotel offers a total of 37,500 square metres of "horizontal" floor space.In order to be able to efficiently finish the concrete shell in the specified, short construction period of only twelve months on time, PERI´s Italian engineers designed a customized climbing formwork solution. Together with the VARIO GT 24 wall formwork, the PERI SKS climbing system forms the most cost-effective climbing version for the exteriors of both towers. As a result, additional concrete loads and lifting forces from the forward and reverse-inclined facades can be safely transferred into the building without the need of any special measures. At the same time, the external formwork serves as slab edge formwork, protection panel and safety barrier when constructing the individual floors. This means that work can also be carried out at large heights both safely and productively. Optimal construction progress has been ensured through the shared use of one set of VARIO formwork for the core walls and internal formwork of both towers. On the one hand, this has resulted in material requirements being reduced whilst, on the other, an entire floor area is always freely accessible for forming, reinforcement work and concreting of the slab. Although the arrangement and dimensions of the window box-outs vary from floor to floor, a complete storey with a 3.50 metre floor height can be finished each week using the PERI solution. So as to maximize building progress, work is carried out on the external facade at the same time as the concrete shell. The inclination of the towers along with the height also required that tailored and flexible solutions were drawn up during the planning phase for the scaffolding. The PERI UP modular scaffold provides scaffolders and users sufficient flexibility in order to be able to adapt perfectly to the inclined form of the structure. In addition, the PERI concept includes intermediate support levels consisting of PERI SKS heavy-duty brackets at heights of 25 and 50 metres respectively whereby the offsets arising from the building inclination are geometrically compensated and loads reliably carried into the structure. For the shear walls in each case, additional reinforcement measures with system components in the lower 20 meters ensured that the increased wind forces and the dead weight of the 70-metre high scaffold construction are safely carried. write your comments about the article :: © 2008 Construction News :: home page |