![]() Over the years following its completion, numerous efforts were made to restore the tower’s orientation or at least prevent it from collapsing. It is interesting to note that the Pisa tower is just at the critical height that is right at the level before it could have collapsed.Ī detailed explanation about the tilt by the lead engineer of the restoration carried out between 1990-2001- (A detailed explanation of the tilt by the lead engineer of the restoration carried out between 1990-2001) The seventh floor was completed in 1319, and the bell chamber was added in 1372 by Tommaso di Andrea Pisano. This resulted in a slight curve in the structure. When in 1272 the work resumed under Di Simone, the engineers built the upper floors with one side taller than the other to compensate for the tilt. After this, the work was on hold for over a century before resuming in 1233. ![]() ![]() The tower began to sink as the construction progressed to the second floor. The foundation of the structure was laid on the 9th of August 1173. The construction was carried out in around three stages which went on for 199 years. The sandy and soggy soil of the region could not bear the weight of this 14,500 tons structure, resulting in a tilt midway through the construction process. The 57m tall structure on the higher side, is merely based on a 3-meter-deep foundation. It is known for its infamous four-degree inclination, resulting from an unstable foundation. The Leaning Tower of Pisa is a free-standing bell tower in the complex of the Pisa cathedral.
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