Santos has a very special problem -- under the 7 meters of sand on which a lot of the buildings were built in the 40's, 50's and 60's, there is a 30-meter layer of very slippery clay.
The buildings do not cope well with it.
There are in fact 90 leaning buildings in Santos, the largest collection in the world. Yes, they are still inhabited, but apparently when one walks along the beachfront, people are always pointing at one or another and saying "that one is getting ready to fall."
Just one building has been set straight in recent years, the Núncio Malzoni next to the Pinacoteca by Canal 4 -- obviously it takes a lot of money, and there never seems to be enough for useful things.
before & after
However, there are plans to fix the others sooner or later, if they don't fall first. Let's just hope that the Brazilian economy stays strong.
Geeeeez ~~ I never heard of this before! It's really scary. I've seen old houses in New Orleans jacked up & leveled & it's not a small process. The idea of having to do it to a multi-storied concrete building -- one surrounded by others of its type -- is totally daunting.
Do you know if any of the buildings have actually fallen, or have been condemned? Also, is that area prone to earthquakes?
I have been searching for more information but it's almost as though there were a blackout on the subject, even when Googling in Portuguese -- perhaps a regional or national embarrassment.
I did manage to find this little video about Santos, past and present. It seems to have been a very pleasant city before all of the old buildings were replaced by high rises. When you get to the modern photos at about the 3.00 mark, tall buildings are quickly shown as though there is nothing wrong anywhere in the city.
Bixa, we had to do this with the typical Montréal triplexes (early 20th-century, about 100 years old) that form our housing co-operative. Not pleasant memories: the ground floor apartments in one building had to be evacuated for several months, and I didn't have a proper wall in my kitchen and part of my hallway until some time in November (it was like camping, brrr).
Montréal is on a large island, and there are underground streams in many places. I can only imagine the problems in cities like New Orleans or much of the Netherlands...
Those buildings are scary. Is it really cheaper to shore them up than to pull them down and start over ? (given that most have no historical interest in terms of Modernism).
The sound isn't working for me with any YouTube (all other online videos are fine). I'll post on that in a relevant category.
This problem can be fixed with a system known as "Compaction Grouting". Go to ASCE.ORG/PUBLICATIONS and search for ASCE/GI 53-19 Compaction Grouting Consensus Guide. I was chairman of that committee and have personally stabilized and "re-leveled" numerous buildings like this all over the world. i.e. U.S., Korea, Japan, Columbia, South America etc. Hope someone looks into this method of repair and if I can be of any assistance my email is: email@example.com