German construction equipment manufacturer Liebherr has been awarded a contract to provide four tower cranes to facilitate construction on this scheme. Six cranes used to build the massive structure will withstand harsh meteorological conditions, especially winds. The tower uses tinted glass and takes advantage of new energy conservation technology that features a high-performance exterior wall system that will minimize energy consumption by reducing thermal loads. The tower will have 59 elevators, including four double decker and 2 triple-decker elevators. The largest floor in the tower is 85,000 m2 consisting of a car park to service 2200 cars. The actual tower starts at +20 metres above ground level, led there by a ramp and podium around the tower. The tower will comprise more than 500,000 m2 of floor space and feature a Four Seasons Hotel, Four Seasons furnished apartments, first-class office space and luxury condominiums. It’s a mixed-use development with 7 floors for offices, 7 floors for hotel, 11 floor of service apartments and different grades of housing all the way to the observatory tower. The tower is expected to have 252 floors with occupied floors being 167. A comprehensive pumping trial was required on site prior to the start of the project to optimize the concrete mixture, because the existing models were not reliable for the project's scale. A high-performance, self-compacting concrete (SCC) C85 is being used for the first and second construction phases up to a height of approximately 400 meters, while for the third phase, continuing on to 675 meters, a similar high-performance concrete will be used but with a lower compressive strength. For placing the concrete, Saudi Binladin Group is using five Schwing concrete placing booms (SPB), with three SPB 35 and two SPB 30 booms, for placing the mix up to a height of over 950 meters. As the project's height tests the limits of current pumping technology, a further concrete pump will be installed at a height of 400 meters to continue the transport of concrete up to the higher floors. Meanwhile, (4 Nos.) Schwing SP 8800 D stationary pumps with 450kW in engine power each and a maximum feed pressure of up to 243 bar are available for high-rise pumping of the concrete. The contractor is employing two dedicated on-site Stetter HN 3.0 batching plants to produce the concrete necessary for this mega project in order to avoid potential delays in concrete supply. It is understood that the main contractor, Saudi Binladin Group, is using Schwing Stetter equipment to provide the concrete for this tower, as it rises towards its eventual height of more than 1,000 meters.
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