Engineers are celebrating the completion of repairs to the Leaning Tower of Pisa. Italian official closed the Leaning Tower for safety reason eleven year ago. Expert now say the repairs will make the building safe for at least few more centuries.
The leaning tower is famous around the world. Many visitors to Italy travel to the city of Pisa to unusual-looking structure. The round tower is more than eight-hundred years old.
The leaning tower of Pisa is easy to recognize. The white stone building is sinking or leaning on one side. The tower is about fifty-five meters high. Its south side is much lower than its north side.
The Leaning tower is leaning because it was built on soft sandy soil. The soil cannot support it weight. The tower weights about fourteen-thousand-five-hundred metric tons. The ground under the tower first started to sink soon after workers began building the structure in the year Eleven-Seventy-Three.
In recent years, the Leaning Tower has continued to sink. Experts expressed concern that the tower might fall suddenly. In 1989, a similar tower in the Italian city of Pavia fell. Four people were killed. The following year, Italian officials closed the Leaning Tower of Pisa. People were no longer permitted to walk up to the top.
An international team of building experts began a project to make sure the Leaning Tower does not fall down. The project cost about 25 millions dollars.
First, engineer placed 870 metric tons of lead weights on the north side of the tower. This helped stop additional movement. Also workers tied strong steel cable around the structure. These wires were connected to large weights in the area.
Next, engineer slowly removed tons of soil from under the tower. They used special drills to remove small amount of soil over several months. Slowly the tower moved back to where it is to where it stood hundreds of years ago. It still leans, but not as much as before the repairs.
Last month, the area around the Leaning Tower opened to the public. However, visitors will have to wait until November before they are permitted to climb to the top. Italian Officials say only about thirty visitors will be permitted to clime to the tower at one time.
(The translation is coming soon)
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