When was pisa built

The construction was finished in and the 7 bells were installed on top of the Tower read more about the bells. Started as a failure, the Leaning Tower of Pisa is today one of the most remarkable achievements in engineering. Since , the inclination of the Tower has been constantly increasing. In the beginning of the century - the monument has been closed as its stability became a major concern.

The lean angle reached 5. Once again, the people in charge of the stabilization works, proved that human intellect is capable of incredible things. It began to lean in once construction on the second floor had begun. The lean was due to one side sinking into the soft ground. The construction was stopped twice, the first time for years, the second time in Both times it was due to wars. If it hadn't been for the two pauses in construction it would have taken between and years to complete. Inside the tower there are seven bells.

Each bell represents one note of the musical major scale. Nobody seems to be able to pinpoint the identity of who the actual original architect really was. Thanks to the soft ground, it had begun to lean by the time its builders got to the third story, in Its architect and engineer tried to correct this by making the remaining stories shorter on the uphill side — but to no avail.

It kept leaning more and more. The next stories were built slightly taller on the short side of the tower in an attempt to compensate for the lean.

However, the weight of the extra floors caused the edifice to sink further and lean more. See more Leaning Tower of Pisa facts. In , for example, under the architect Di Simone, engineers built upper floors with one side taller than the other, and it is because of this that the tower is curved.

Eventually the bell tower was added in , with the largest of the seven bells installed in The length of the project, caused by a mixture of construction failures, war and differing architects and designers makes the completion of the Leaning Tower even more impressive.

Its struggles can be seen in the fact that it still leans, whilst its combination of Gothic and Romanesque style demonstrate its centuries worth of production. Interestingly despite its unstable structure the tower is still with us today, surviving wars and natural disasters. Engineers have concluded that this is a result of the dynamic soil-structure interaction which enables the Tower to withstand tremors.

Through a combination of the buildings height and stiffness and its soft foundations, the Tower does not resonate with earthquake ground motion, making its greatest vulnerability its cause of survival.

This is thanks to the worldwide request put out by the Italian government in , asking for aid in preventing the tower from toppling.