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| Peri reached for the sky with Cuatro Torres in Madrid  The Weissenhorn-based formwork and scaffold manufacturer, Peri, offered the most cost-effective solution for the so-called "Cuatro Torres", currently under construction in the Spanish capital, Madrid. The development includes the Torre Espacio, the Torre de Cristal and the Torre Repsol. The completion of all buildings is planned for between May 2007 and the beginning of 2008. In order to be able to maintain this tight schedule, Peri formwork systems are being effectively used on this large-scale construction site.With over fifty floors, the Torre Espacio has an overall height of 223 metres. Around the three centrally-arranged cores, the initially square-shaped ground plan changes into an elliptical form. The 15 m x 10 m rectangular central core features varying wall thicknesses between 40 cm and 1.00 m, and is bordered by two U-shaped, 30 cm thick side cores. Although the 120 m˛ Peri Vario wall formwork is mounted on only a single Peri ACS G self-climbing unit (G = Gallows) for the two lateral cores, additional requirements had to be fulfilled for operations in the central core. With the Peri ACS P system (P = Platform), the contractors are able to simultaneously position 450 m˛ wall and slab formwork as well as the beam formwork in one climbing sequence. The central placing boom can also be climbed with the ACS P; a special steel construction ensures a safe transfer of loads via the ACS into the building. The 249 m high Torre de Cristal was the creation of the Argentine architect, César Antonio Pelli, who was responsible for the Petronas Towers in Malaysia. Built ten years ago, the then highest building in the world was erected also using Peri ACS self-climbing formwork. For the core of the Torre de Cristal, all three versions of the modular ACS system are being used – no problem here as the ACS R (R = Regular), ACS P (Platform) and ACS G (Gallows) can work in parallel ensuring optimal working procedures and, where required, can be efficiently and effectively combined. Altogether, 1, 150 m˛ Vario wall formwork, including the placing boom, have been distributed on ten individual climbing units. As the building increases in height, the wall thicknesses taper from 1.20 m to 70 cm. Special adapters ensure that these offsets can be climbed over without any problems. In the upper levels, the Cristal external facade has an increasing chamfer due to a continuous change in the ground plan at all four edges which gives the building the appearance of a polished crystal. The core also undergoes tapering in the ground plan over three floors. Adjusting to the variable geometry with the resulting inclined walls takes place using Peri ACS and Vario GT 24 within the system itself. With a height of exactly 250 metres, the Torre Repsol dominates the new multi-storey building complex in what will eventually become the highest building in Spain. Sir Norman Foster, the renowned English architect and Pritzker winner, has designed this structure with two externally positioned reinforced concrete cores. Each core contains seven elevators, stairs and service shaft. Between the two distinctive external columns, floor levels are arranged similar to that found in a shelf system. Three intermediate steel platforms carry eleven to twelve floors in each case. The Vario GT 24 girder wall formwork and Peri ACS match the complex ground plan with wall thicknesses between 30 cm and 2.00 m perfectly. During the operational planning, Peri engineers also had to take into consideration the construction site crane which is positioned in the core. From the supporting frame for the placing boom up to the lowest suspended finishing platform for the special steel fittings, the ACS unit has an overall height of 25 metres in the area of the elevator shafts. By using the Peri climbing solution, the contractors are successfully maintaining the planned 4.70 m floor height weekly cycle for both cores. write your comments about the article :: © 2006 Construction News :: home page |