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1,844,732 Views ⢠Dec 19, 2023 ⢠Click to toggle off description
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The lean isnât just a fascinating oddity; it is integral to the historical character of the tower. Itâs a big part of why we care. Unlike the millions of photos of tourists pretending to hold the Pisa tower up, the contractors, restoration experts, and engineers actually did it (for the next few centuries, at least).
Sources: The script is primarily based on the papers linked below.
www.tandfonline.com/doi/abs/10.1080/13556207.2002.âŚ
associazionegeotecnica.it/articoli_rig/electro-osmâŚ
www.issmge.org/publications/publication/the-leaninâŚ
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YouTube Comments - 1,381 Comments
Top Comments of this video!! :3
There's just something extremely joyful about a guy being able to say "recreational geology" with a straight face and a genuine smile
900 |
I was there in 1987, 3 years before the tower was closed for repairs. It is a terribly disorienting building to climb the stairs to the top, not only because of the lean that causes you to (correctly) feel like you are leaning in every direction in sequence, like someone terribly drunk, but also because the centuries of foot traffic on the steps have caused them to wear out unevenly, so they are dished out where the feet have trafficked the most. Plus the single narrow spiral stair has both people climbing up and people climbing down at the same time. It was also ver scary when you got to the top, because from the lowest side of the platform, you could not see the base of the tower beneath you, the lean was so great. But I'm glad I had the opportunity and really glad it did not collapse while I was in the tower. I'm so happy it has been stabilized now and future generations will have a chance to experience it themselves.
68 |
I love the nod to Mitch Hedberg at the beginning. "A river used to run into the Ligurian Sea, It still does...but it did back then too"
89 |
It's absolutely wonderful that the engineers locked the leaning side into the sidewalk to support it. Medieval architects were something else.
1.8K |
âIf youâre into recreational geology & heavy construction!â đ I really wasnât until I started watching your channel! Now I think about it driving down the road looking at anything that was built.
804 |
The tower is *curved*?! That is amazing. I can't believe I never knew that.
991 |
5:23 - 5:48 Sneaky, sneaky Grady!!! The Tower was increasinig in it's tilt that entire 25 seconds and I only noticed the difference when I did a quick rewind of the 20 seconds prior to 5:48 to show the stark difference once the catino was removed. Very subtle and VERY well done in your graphics - bravo!! And overall, this video was beautiful and a wonderful illustration of the tremendous, positive real world impact engineer's have on the world!!
15 |
A couple other ideas that were rejected were installing a tube system under the foundation to freeze the water in the subsoil, controlling the temperature according to the lean, or using hydraulically injected foam to correct the lean in conjunction with injecting a water-cured polymer to harden the subsoil.
1.2K |
Grady, your channel is my favorite example of why YouTube channels are so much better than regular TV.
So many old cable shows would breeze over topics and say "amazing, right?"
Those shows were dumbed down and insulting; while your videos are deeply interesting and, by inspiring young people to pursue an engineering career, literally making the world a better place. Thank You!
663 |
Fun fact: The engineers from Imperial College London that assisted this project had already stabilised the Queens Tower at their university in London, and later stabilised Big Ben with the same methods.
93 |
The ending monologue about the team working to continue an 800 year old project was oddly touching. Kudos!
30 |
I've had many teachers throughout my life. This channel continues to be on the top ten list of most influential.
53 |
I saw the bracing of the tower when visiting Italy in the late 90s, however, I didn't get to see the actual fix being done at ground level since the work area was boarded all around. The cables clearly looked temporary, as they were not fixed permanently to the tower rather they embraced the exterior with wood planks to shield the stone from the cable. For everything I saw above the edge of the fence, I guessed they were pumping some sort of cement mix under it, not taking out soil. They did a nice trick there. Thanks for telling the story.
72 |
I just visited the leaning tower of Pisa a month ago on my honeymoon and itâs amazing thing to see in person. I learned all about its lean and foundation changes. So awesome you made a video on it! I loved it
55 |
I saw the title and thought, âWhat? Again?â Iâm glad I didnât miss anything as big as a second stabilization, and Iâm happy to finally hear the story of how it was done.
19 |
I'm reminded of the stories a friend of mine tells. he worked construction on housing developments in Florida, and in many places, the slab foundations for houses floated on wet sand until the house was built and slowly compacted the water out. if the house was built asymmetrically, the foundation would tilt under the unbalanced load, so they had to be careful how they loaded the material onto the slab.
173 |
At the moment in Italy we're having a very similar situation in Bologna, where one of the two towers is leaning so much they had to close part of the town center. From what I understood, the real issue is that in this case the motivation for such lean are unclear, hence there's no idea of how to act.
108 |
I always love a good Mitch Hedberg reference. Nice!
4 |
That opening line was pure Mitch Hedberg goodness. Well played, Grady!
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@mfaizsyahmi
4 months ago
I find it very amusing that the sidewalks are actually load bearing, not just for pedestrians but the entire tower.
3.8K |