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| Crane-free operations facilitate working processes  The Frankfurt skyline is currently being re-defined: on one of the most beautiful locations in Germany directly opposite the Alte Oper, the so-called OpernTurm is steadily rising to reach its planned height of 170 metres. 52,000 square metres of office space is spread over 43 floors with an additional 10,000 m² in the adjacent seven-storey podium building. The development of this inner-city large-scale construction site is associated with enormously high safety requirements and presents a logistic challenge to all those involved in the project. Then, due to the minimum of storage and assembly areas which is only available, the type and quantity of the formwork deliveries have to be adapted to match the planned construction sequence.The Weissenhorn-based formwork and scaffolding specialist, PERI, is supplying the best-suited system equipment and supports the contractor with a comprehensive range of engineering and related services. On the basis of the ACS and RCS self-climbing systems, PERI created a suitable implementation concept, perfectly co-ordinated with the requirements of the Züblin-led construction execution. As a result, the site crew can also work at large heights protected against the wind and concealed from view – crane-independent and regardless of the weather conditions. Due to the enhanced working safety levels and the associated increase in efficiency, a regular four-day cycle has been achieved for the standard storeys. The construction of the two reinforced concrete cores with 3.63 metre concreting cycle heights is done in advance independent of both crane and weather using 16 ACS self-climbing units (ACS = Automatic Climbing System). For this, the ACS P (P = platform) and ACS G (G = gallows) versions are used. In certain segments, walls and slabs can be concreted in one single operation. For shuttering and striking of tightly-spaced building sections, VARIO girder wall formwork is ideally combined with the TRIO panel formwork. Shuttering and striking are thus made easier due to the fact that all formwork elements are retractable and suspended on an end-to-end working level. In addition, PERI UP scaffold stairs provide safe access to the working platforms. A 12-metre high stair unit, attached to ACS brackets, climbs together with the platforms from cycle to cycle. On the external facade, the PERI RCS rail climbing system (RCS = Rail Climbing System) offers three advantages. Firstly: the foldable VARIO column formwork is firmly connected with the girder grid of the RCS formwork scaffolding and climbs crane-independently to the next respective level. Secondly: in addition to the wall and column formwork, three working levels – this includes the floors under construction – are completely enclosed. As a result, construction site personnel are secured against falling as well as being protected against strong winds at large heights. And thirdly: the exterior of the protection panels are used by the investor as highly visible advertising billboards. Similar to the ACS for the cores, the PERI RCS also climbs by means of rails. This means that the RCS climbing units to the building with climbing shoes during the entire climbing procedure. The optional use of mobile, i.e. manually operated, hydraulic RCS climbing devices makes crane-independent climbing even more cost-effective. For the total of 64 RCS brackets, only 16 self-climbing devices are required for the OpernTurm project. This has clearly reduced the cost for the self-climbing technology. write your comments about the article :: © 2008 Construction News :: home page |