The construction of iconic towers such as the 828-metre high Burj Khalifa (formerly Burj Dubai), officially inaugurated on 4th January 2010 in Dubai, poses many challenges to surveyors. Tall towers may bend and sway in the wind, with cranes and other loads. Ideally, such motion should centre on the as-designed main axis, so that in the absence of load the tower stands precisely vertical, but deviations occur as a result of raft settlement, concrete shortening and construction tolerances. The author presents a new, patented measurement system capable of driving the highest towers in an exactly vertical direction.
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