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| PERI allows Saudi Arabian stock exchange to climb  Apart from being the capital, Riyadh is the economic as well as cultural heart of Saudi Arabia. The King Abdullah Financial District, currently being developed to the north of the city centre, will become the financial hub of the kingdom. For the cores of a number of high-rise buildings in this district, PERI climbing formwork is being used. With a system combination comprising of ACS self-climbing and RCS rail climbing technologies, the optimal solution to meet project-specific requirements was created. The planning took into consideration the varying storey heights, upward tapering walls and a particularly short construction period. The site management is extremely satisfied with the well thought-out systems along with their systematic and simple application.In close co-operation with PERI engineers in Jeddah (Saudi-Arabia), PERI Weissenhorn developed climbing formwork solutions for five reinforced cores in four multi-storey buildings. The concept is based on two climbing systems which have been adapted to meet the geometrical and static boundary conditions of the structures as well as the requirements of the contractor. For the core of the highest building – an office tower with a total height of around 150 metres – the ACS self climbing formwork is being used. With its 85 metres, a second office tower is lower and is therefore being constructed with the RCS Rail Climbing System. This modular construction system has also been selected for the three cores of the two residential towers which will eventually rise to heights of 100 and 70 metres respectively. The standard individual storey height in the office buildings is about 4.00 metres whilst the residential towers have 3.40 metres. All the formwork scaffolding is combined with VARIO GT 24 girder wall formwork which can easily be adapted to the different storey heights as well as wall breaks without any problems. The cores of the two highest towers are climbed with hydraulic support; for the two other buildings, the climbing formwork is lifted from floor to floor by means of a crane. For the 150-metre high office block, ACS self-climbing formwork is being used. The rail-guided self-climbing formwork scaffolding, complete with strongbacks and formwork carriages, will require a total of 40 climbing cycles before reaching the top of the reinforced concrete core. The climbing rail is climbed in advance, is then secured automatically in the climbing shoe and carries the system during climbing operations. The control mechanism and mechanics of the ACS system are robust and reliable. For all the other building cores, RCS rail climbing technology is being used. The modular construction system can be used for a wide range of applications in climbing technology which means that the use of special parts is reduced to a minimum. In Riyadh, the RCS is used as formwork scaffolding. The VARIO GT 24 girder wall formwork is securely mounted on a formwork carriage and can be retracted for reinforcement work by up to 90 centimetres – without requiring a crane. For supporting the formwork on the carriage, SRU steel walers and SLS spindles are installed and used as strongbacks and adjustable struts respectively. Thus, complete units can be easily and quickly moved in one crane lift. With the climbing rail, the scaffold unit is always connected to the building throughout the entire climbing procedure by the climbing shoes. During strong winds, the RCS climbing unit is kept in a very stable position and cannot drift from side to side which means climbing is fast and safe at all times. The RCS system also offers a shaft solution for the inner walls which is used for those cores with large dimensions. Here, the RCS climbing rail serves as a platform beam. The rails can be continuously telescoped which means the lengths of two beams positioned opposite each other are able to be easily adjusted to suit the shaft dimensions and subsequently connected to a working platform. Apart from the formwork systems for the reinforced concrete cores, PERI is also supplying the slab formwork including required support. Around 10,000 square metres of SKYDECK aluminium panel slab formwork is being used which can be quickly and easily installed due to its lightweight individual components. In particular, the systematic and virtually self-explanatory shuttering procedure has proved to have been a tremendous advantage according to the site management: these easy to install systems help the building contractor enormously to realise and maintain the very tight construction schedule despite the lack of available skilled workers. In addition, due to the possibility of early striking thanks to the drophead, material utilisation is accelerated and on-site material requirements are reduced. MULTIPROP props carry the slab formwork of the standard floors. For the larger ceiling heights in the ground floors, two props are coupled together and connected with MRK frames to form high load-bearing supporting towers. Development of the formwork solution took place within a very short space of time due to the very tight schedule: in the early summer of this year, only a few weeks after starting the planning, the first system components were delivered to the construction site. With this, PERI GmbH made an extremely convincing and impressive case in the Kingdom on the Arabian Peninsula completely in keeping with its maxim: safer, easier, faster. write your comments about the article :: © 2009 Construction News :: home page |