Skyscraper
Skyscrapers are an extraordinary feat of human engineering: exposing millions of pounds of concrete and steel to the enemy forces of wind and gravity. Starting with the foundation and on through the support structures and concrete flooring, every piece of these superstructures has to be super-strong. Go behind the scenes with the five tools that make these buildings possible: the foundation drill rig, the tower crane, the impact wrench, the power trowel, and the total station.....Awww..you see that,,is so amazing
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