Historical background In 1889, the 100th anniversary of the French Revolution, Paris held a large-scale international exposition to celebrate. The most eye-catching exhibit at the fair is the Eiffel Tower. It became a symbol of the industrial revolution sweeping the world at that time. The designer of the Eiffel Tower is French architect Gustave Eiffel. In his early years he became known as an expert on dry bridges. There were many masterpieces in his life, all over the world, but it was the iron tower named after him that made him famous. In his own words: The Eiffel Tower "overwhelmed me, as if I had only built her all my life." At the beginning, although the French government decided to build the world's tallest iron tower in Paris, the funds provided were only 1/5 of the required cost. In order to realize his design, Eiffel mortgaged his construction engineering company and all his properties to the bank as engineering investment. On January 28, 1887, construction of the Eiffel Tower officially began. 250 workers worked 8 hours a day in winter and 13 hours a day in summer. Finally, on March 31, 1889, the steel structure tower was completed. The Eiffel Tower is made up of many scattered pieces - looking like a bunch of model components. However, these fragments are not plastic, but metal, and there are 18,038 of them, weighing 10,000 tons. During construction, a total of 7 million holes were drilled and 2.5 million rivets were used. Since every component on the tower was strictly numbered in advance, there were no mistakes during assembly. The construction was carried out completely in accordance with the design, and no changes were made during the process, which shows that the design is reasonable and the calculation is accurate. According to statistics, there are more than 5,300 design sketches of the tower alone, including 1,700 full drawings. The completed Eiffel Tower was 300 meters high and remained the tallest building in the world until 1930. Today, radio and television antennas have been added to the tower, and its total height has reached 320 meters. Standing on the tower, all of Paris is at your feet. Tourists from all over the world come here to visit every day. By 1988, the "Iron Lady" had welcomed 123 million tourists from five continents. On March 31, 1989, the Eiffel Tower turned 100 years old. For this reason, the Eiffel Tower Management Company specially hosted a grand commemorative event, recreating the historical scene where Eiffel led the crowd to the summit a hundred years ago: "Eiffel" wearing a black dress, a wide-brimmed hat, holding a national flag, and 30 "famous people" ", "Construction workers", climbing up the stairs amidst the grand sound of drums. When he placed the tricolor flag on the top of the tower, a 21-gun salute was fired, pigeons flew around the tower, and colorful balloons floated into the blue sky. Colorful banners with the words "Celebrating the 100th Anniversary of the Tower" written in languages ??from around the world were hung on the fence on the 2nd floor platform of the Tower. Countless tourists eagerly witnessed this spectacular scene. The Eiffel Tower has gone through hundreds of years of ups and downs. After an overhaul in the early 1980s, it still retains its style and stands majestically on the banks of the Seine. It is the pride of all French people. The Eiffel Tower covers an area of ??one hectare and stands on the Champ de Mars on the banks of the Seine in downtown Paris. Except for the four legs, which are made of reinforced concrete, the whole body is made of steel. The total weight of the tower is 7,000 tons. The tower is divided into three floors, the first floor is 57 meters high, the second floor is 115 meters high, and the third floor is 274 meters high. Except for the third platform, which has no gaps, the other parts are all transparent. There are 1,711 steps from the tower base to the top of the tower. An elevator has been installed, so it is very convenient.