Tallest Arch in the World... How It's Constructed??

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Transcript

00:00This is the tallest man-made arch in the world.

00:03The key feature is that there is a cable car inside it that can go

00:07directly to the observation deck, just like a closed Ferris wheel.

00:12It is the St. Louis Arch, located in Missouri, USA, and it was built

00:17in 1963.

00:20The arch was built from both ends at the same time.

00:23These triangular parts were installed from the bottom to the top, layer

00:27by layer.

00:28At first, they used a crane to mark the parts and poured concrete in

00:31the middle of the parts to improve the rigidity of the arch.

00:35At the same time, they installed a preload rod to support the legs and

00:40keep them stable when bending inwards.

00:42However, the height of the crane was only enough to build the lower six pieces.

00:47For this reason, engineers installed track-crawling cranes on both sides

00:52of the arch.

00:53The cranes gradually increased with the height of the arch.

00:56However, the arch, bent at a certain height, could not bear the weight,

01:01so engineers installed a stable cross frame in the middle of the arch for

01:04support, and then continued to build.

01:07The entire construction process had to be very precise.

01:12If there was a slight deviation, it would not be able to dock smoothly.

01:16At the final docking ceremony, there were thousands of people watching, but

01:21a new problem arose.

01:23The gap of 2.5 meters should have been reserved for the last triangular piece.

01:28Due to thermal expansion and contraction, only 0.6 meters was left.

01:34For this reason, engineers continued to spray water on one side of the arch to

01:38cool it down and use jacks to prop up enough space.

01:42Only then could they successfully dock it.

01:45Of course, the space inside the hollow arch is not wasted.

01:49Inspired by the Ferris wheel, engineers installed eight cable cars on each side.

01:55Each cable car can seat five people and go directly to the observation deck at

02:00a height of 192 meters and 63 floors, which can accommodate 100 people.

02:06Like and follow for more informative videos.

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