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How did the famous Leaning Tower of Pisa straighten by four inches?

2022-12-24 17:01:05Lifestyle SHKRUAR NGA REDAKSIA VOX
How did the famous Leaning Tower of Pisa straighten by four inches?
Leaning Tower of Pisa

The Leaning Tower of Pisa is one of the most popular tourist attractions in Italy, with more than six million visitors each year, bringing in around €21 million to the local economy.

But while it remains a major draw for millions of tourists, the tower's tilt has been a cause for concern among engineers and historians for decades.

However, thanks to the stabilization works, the iconic tower is slowly but steadily "moving" to stand up.

And how did this progress come about?

When construction work on the clock tower began in 1173, just five years later it began to lean. Workers noticed a shift during the construction of the second floor, which was caused by the unstable subsoil. To compensate, workers built the upper floors with one side shorter than the other – meaning the structure was curved and tilted.

In 1990, the tower was still leaning towards the south, causing concerns that it might collapse entirely, so it was closed to the public, Unilad writes.

To fix this, the engineers decided to try "earth mining", which involved digging out the soil from under the north side of the tower. They then used steel cables to pull it upright, which was effective. The project was completed in 2001 after the tower was straightened by about 38 centimeters and has continued ever since.

In the 21 years since then, the tower has moved another four inches, according to a recent study. A recent study funded by the conservation organization Opera Primaziale della Pisana (OPA) found that the slope continues to decrease, but still fluctuates by an average of half a centimeter per year.

The OPA spokeswoman said that since it is an 850-year-old "patient" with a slope of about five meters and a slide of more than three meters, the "state of health" of the leaning tower is excellent.


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