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| One climbing system two climbing methods  Two spectacular high-rise buildings are currently twisting and turning upwards into the Canadian sky. During the construction of the extremely complicated building geometry, the PERI RCS climbing protection panel is ensuring rapid building progress and maximum working safety. Two curvaceous skyscraper towers form this urban-development highlight as part of the new Absolute World City Center in Mississauga. The inner-city ensemble consists of five apartment and office blocks with heights of up to 167 m. Very striking and exceptional, however, are the rotations of the two most recently completed buildings: the southern tower with a varying rotational movement and the northern tower which twists uniformly upwards.For both buildings, the complete enclosure of the upper floors through the RCS climbing protection panel ensured the safety of the construction site team which has resulted in higher productivity. Due to the different rotations by different degrees at different levels, PERI engineers developed two unusual climbing methods with the help of the modular construction system, adapted specifically to suit the respective project requirements and building geometry. With the 167 m high Absolute Tower South, the elliptically-shaped ground plan rotates by more than 200° over the course of 56 floors featuring twists of between 3° and 8° from storey to storey. In order to ensure safe working conditions also at great heights along with increasing productivity levels, the working area of the three uppermost floors in each case is completely enclosed by means of the RCS climbing protection panel. Regarding crane and weather-independent moving of the 30 RCS units, the contractor is working extremely efficiently with the mobile RCS self-climbing technology. Also during the climbing procedure, the climbing rails are firmly connected to the building by climbing shoes. Compensating the offset between the individual floors is achieved by system steel girders anchored to the slabs: on the other hand, universally usable RCS climbing rails cantilever up to 2 m beyond the edge of the slab and support the climbing protection panel. Through the large usable compensation area, the number of levels is minimized where the RCS units have to be re-adjusted due to the rotation of the storeys. For the floor-by-floor planning of the enclosure, PERI engineers took into consideration all possible obstacles and discontinuities in order to determine an optimal element arrangement and separate for each floor the corresponding anchor positions. Start of construction for the 150 m high, 50storey counterpart in the north took place a few months later. For its realisation, PERI designed a spectacular and extremely cost-effective climbing variant. As the rotation of the elliptical-shaped floors is a constant 4° in each case here, the RCS protection panel itself uniformly turns in an upward direction. In addition, the climbing rails are inclined at an angle of 26° to the vertical and connected to the storey slabs by means of RCS system climbing shoes and project-specific modified slab shoes. Likewise, the RCS units are climbed hydraulically moving with the crane would not be possible due to the inclined climbing track. That this unique climbing method is possible with the RCS rail climbing system as well as being applicable in construction site conditions was proven beforehand by PERI engineers with corresponding calculations along with a test set-up. write your comments about the article :: © 2011 Construction News :: home page |