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| Climbing formwork solution for angular geometry of a gigantic frame  An exceptional, walk-in work-of-art structure has been created in the capital of the Dubai emirate: a huge frame whose glass crosspiece provides visitors with a spectacular view. For realizing this building assignment, PERI formed a project team comprised of climbing and formwork specialists. From the very beginning through to the end, they supported the complex shell construction with precisely matched execution solutions. As a result, the angular core geometry could be realized within the very tight dimensional tolerances; in addition, 30 days construction time could be saved. The Dubai Frame is a huge frame situated in the green Zabeel Park: 155 m high and 93 m wide – without doubt the largest picture frame in the world. The real backdrop of Dubai serves as a framed work of art. Glass elevators take visitors to the top where they can enjoy breathtaking panoramic views from the self-supporting 75 m bridge structure which is fixed between the two towers. From there, visitors will have a bird's-eye view of the historic old Dubai in one direction and as they turn around, will see the modern skyscraper architecture of the city in stark contrast. In the centre of the bridge, a glass floor provides an additional perspective of a direct view of the ground far below. Also at the base, both towers are connected by a walk-in cross frame which optically closes the picture frame and creates additional space for exhibitions as well as a museum. Highly specialized climbing solution The profile of the over-sized frame is characterized by a very special shape whereby the two extremely slender towers have trapezoidal-shaped ground plans. Within the distinctly angular core geometry, the in part only 30 cm thick walls had to be concreted and climbed. For this, the PERI engineering team from Dubai designed climbing formwork solution which exactly matched the specific project conditions. They combined three different ACS self-climbing versions with VARIO Girder Wall Formwork and TRIO Panel Formwork. The solution provided rail-guided safe climbing operations without the use of a crane along with short cycle times. Storey heights of up to 10 m and the particularly narrow shaft dimensions with minimal wall clearances made accessing all working areas more difficult. The only solution to facilitate easier access to the upper areas was a combination of elevated and suspended platforms. In addition, the integrated access technology provided valuable working space and a maximum level of safety. For the two identical towers of the frame structure, five platforms were used which included, among other things, suspended TRIO Panel Formwork. For the climbing procedure with the integrated climbing hydraulics, the complete performance capability of the 100 kN lifting force provided by each hydraulic cylinder was therefore fully utilized. The ACS Self-Climbing Formwork also allowed varying climbing options for the platforms which meant they could be guided either independently or simultaneously upwards. This enabled the construction team to quickly move from floor to floor resulting in a high level of productivity. Thus, work could be carried out crane-free in regular 3½- day cycles that ultimately saved valuable construction time. Constructive solutions as a complete package 46 of a total of 52 floors could be concreted extremely quickly with the self-climbing formwork. In the transition area to the approx. 2, 100 t steel cross frame, however, the cores had to be reinforced and the formwork solution accordingly adapted. As a result, up to 3.50 m cantilevered and 1.40 thick intermediate slabs were constructed. SB Brace Frames from the PERI product portfolio were used horizontally and reliably transferred the very high loads. For forming the inclined reinforced concrete columns and the slab of the connecting crosspiece on the ground, PERI engineers likewise used system components for their solution – this mainly consisted of Girder Formwork, the VARIOKIT Engineering Construction Kit along with PERI UP Modular Scaffolding. Comprehensive project support The Al Rostamani Pegel L.L.C. (ARP) construction company has realized numerous projects together with PERI in the past and appreciates the high quality of the PERI solutions as well as the excellent standard of service. For this project, with its initially easily underestimated complexity, the company was provided with quick and efficient on-site support by the PERI project team when required through effective solutions for dealing with the complex construction tasks. PERI GmbH Formwork Scaffolding Engineering Rudolf-Diesel-Strasse 89264 Weissenhorn Germany Phone +49(0)7309.950-0 Fax +49(0)7309.951-0 Contact PERI Editorial Office Phone +49(0)7309.950-1191 Fax +49(0)7309.951-1191 Image 1 Construction of the two 155 m high towers with trapezoidal-shaped, extremely slender ground plans was realized using a reinforced concrete design. Within the angular core geometry, the in part only 30 cm thick walls had to be concreted and climbed. (Photo: PERI GmbH) Image 2 The customized climbing formwork solution combined three different ACS self-climbing versions with VARIO Girder Wall Formwork and TRIO Panel Formwork. (Photo: PERI GmbH) Image 3 The climbing units, consisting of wall formwork and platforms, were moved from storey to storey using an integrated hydraulic system. The efficient working operations resulted in a very high level of productivity and short cycle times. Simultaneous climbing ensured considerably less leading edges and thus increased working safety. (Photo: PERI GmbH) Image 4 The planned exhibition area covered the complete 90 m width between the two towers. The 24 inclined columns, each 7 m high, were formed with VARIO GT 24. PERI UP Modular Scaffolding was used as shoring for the MULTIFLEX Slab Formwork as well as access scaffold. (Photo: PERI GmbH) Contractor Al Rostamani Pegel L.L.C. (ARP) Field Service PERI L.L.C., Dubai, United Arabs Emirates Re-printing of this article is free of charge but with reference to PERI GmbH as the source Copy kindly requested Number of characters: 5073 write your comments about the article :: © 2016 Construction News :: home page |