According to Smithsonian Magazine , the tower took approximately years to build from start to finish, with several work stoppages. While working on the eighth floor of the tower, builders angled the story to the north to counterbalance the tower's southern drift. However, this too proved to be a failure as the additional weight caused the structure to tilt even farther. After the tower was completed around , the drift continued. The tower continued to sink at an annual rate of. The monument closed to visitors as engineers attempted to stabilize it.
According to one study published in , the Tower of Pisa's stabilization proved to be an immensely difficult task due to the weak base in the foundation. Any disturbances in the ground beneath the foundation could threaten its collapse.
The Italian Government organized an international committee, including experts in the arts, restoration and structural and geotechnical engineering to help stabilize the monument. It was the least invasive technique, and promised to reduce the tilt from about 15 to Work was slow and sometimes abandoned for decades as Pisa was often at war with nearby Florence, Genoa and other city states.
The tower was finally completed in Attempts were made throughout the tower's history to correct the tilt. Some of them made the problem worse and by the s there were fears the tower could collapse altogether. The Italian government appointed a 'committee of 13 experts' to come up with a plan to save the tower in The team was led by British engineering expert John Burland.
A study found that 'the bell tower is stable but tending to straighten' and that it had moved a further 2. The structure is expected to straighten another couple of millimetres and then start to lean again — but at a much slower rate. The tower was closed to the public in for engineers to come up with a way to stop the tower collapsing. The team hit on a solution that would reduce the tower's inclination by about half degree - reducing stress on the building's masonry and stabilising its foundations.
The method — known as soil extraction — saw engineers dig a series of tunnels on the north side of the tower and remove small amounts of earth.
The tower leans to the south. Steel cables helped pull it back into its original position. The project team also found that the tower tilted more in winter as the north side water table was higher than the south when it rained. This lifted the north side even more.
The tower straightened itself by 38cm after the work was done and has continued to straighten since. It reopened to the public in Give us feedback. Read Next View. La Lu Cozy Rooms 2. Relais le Ortensie. Antiche Navi Pisane. Rosso di Sera Relais Tuscany.
Il Mattino ha l'oro in bocca. Show More. The so-called Leaning Tower of Pisa is one of the most famous buildings in the world, although maybe not for the reasons its original architects would have wanted. In , construction began on a white marble bell tower for the cathedral complex in Pisa, located between the Arno and Serchio rivers in Tuscany, central Italy.
As a result, the structure had begun to tilt visibly toward the south. Shortly after that, war broke out between Pisa and Genoa, another Italian city-state, halting construction for nearly a century.
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