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Let’s take a guess at the picture on the second floor.
The tilt of the Leaning Tower of Pisa is 3.99 degrees. In 1982, the survey team of the Architectural Design Institute was conducting professional surveying and mapping. During the surveying and mapping, it had already measured 6 degrees, 51 minutes and 52 seconds.
The first and most likely reason is that the foundation of the tower is now higher in the north and lower in the south. This has caused uneven settlement of the terrain, causing the tilt of the tower's foundation and the entire tower. The second reason is because we see that a large piece of this tower, the lowest level on the north side, is missing. Well, one reason is that local people found coins from the Song Dynasty in the cracks of the bricks at the base of the tower. The people thought there were treasures in them, so they often dug and extracted bricks. As a result, the gap is getting bigger and bigger. If such a large piece of the underground base is missing, it may also increase the probability of the tower tilting. Then another reason is that our Jiangnan area belongs to the southeast coastal area and has a subtropical monsoon climate. It may also be affected by typhoons. It is also possible that when the tower was built, it was deliberately tilted a little southeast to balance the impact of the southeast monsoon.
According to on-site investigation, this tower is made of bricks, and the density of the bricks is very high. The adhesive between the bricks, according to the test, is a unique adhesive mixed with glutinous rice and mortar. So this kind of adhesive, after actual testing, its firmness and solidity are actually no worse than concrete.
This post was last edited by Yuyu in the Desert on 2017-4-15 21:26. In addition to this tower, there are many famous leaning towers in my country, including Dinglin Temple Tower, Xunyi Tai Tower, Suizhong Leaning Tower, Suzhou Huqiu Tower, Zuojiang Leaning Tower, Yingxian Wooden Tower, and Yuanyang County Linglong Tower. They are still standing today.