Compounding the difficulty, the hotel was already under construction when Saudi King Abdul Aziz decided that its main tower should be crowned with a clock - the original 76-story structure was not designed to support the 200m/656-ft tall addition. ![]() Further, the clock would be crowned with a 22m/72-ft diameter, 160m/525-ft tall, crescent-topped finial (see drawing, at right), which would house a Lunar Observation Center. Because it is rectangular - the east and west faces are slightly more narrow (38m/125-ft wide by 43m/141-ft tall) than the north and south faces (43m/141 ft square) - PCT would have to fabricate two different pairs of clock faces, each assembled from hundreds of differently shaped panels, which would be drilled to accommodate a total of 700,000 light-emitting diodes (LEDs) for night-time illumination. ![]() Paired on many projects, beginning with the sliding domes in 1988, PCT and SL-Rausch nevertheless faced some unusually large challenges in this massive tower. PCT’s managing director, Hannes Waimer, credits the failure-free performance of these structures, in part, to detailed design and testing performed by the SL-Rasch/PCT team. CompositesWorld, Plataine launch composites technology survey
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