Tofu -like soil layers+cliffs, 10,000 tons of high -rise buildings are built on it!They did this ...

Author:Jiangsu News Time:2022.06.25

To pay tribute to the creators and guardians of a better life, Jiangsu Radio and Television General Taiwan Rong Media News Center and Jiangsu Federation of Trade Unions launched special planning "The Strongest Voice of the Times". "Wanzhang high -rise buildings start flat", no matter how high the building must rely on a solid foundation to build it. In the process of building, it is not easy to lay a solid pile, especially the buildings are often built in some special places. For example, on the banks of the Yangtze River of Nanjing, a new landmark of a city is required, and in order to support this building, it is necessary to lay down the deepest drilling pile of the domestic super high -rise buildings on the cave. How can this "Qing Di Wall" that supports the 10,000 -ton building be played to ensure the safety of the building in the future?

The Nanjing Huaneng Gemini project is only 200 meters from the Yangtze River. Two geological bands on the Yangtze River on the banks of the Yangtze River hundreds of thousands of years ago, it caused a harsh geological environment such as geological breaks and rocky crushing. In the underground, tens of thousands of years of water in the Yangtze River formed a complicated cave. On the ground, Zhang Zhonghao will lead the team to build two 10,000 -ton buildings.

"Half -high -rise buildings have half the foundation falling on hard rocks, and half of the foundation falls on the basis of tofu. This project is also the top in the country in the field. The high -rise construction field is unique. "Zhang Zhonghao, executive manager of Nanjing Huaneng Gemini project of the China Construction Second Bureau, said.

The Yangtze River coast where the Huaneng Gemini project is located, the unique soft land is high in water, just like tofu, which is like a nightmare for architects. Not only that, due to the seismic fracture belt, and the erosion of the Yangtze River water, a huge cave is formed under the soft land base of dozens of meters underground. The soil layer is a cliff. To build a high -rise building on such a foundation is enough to make the project manager Zhang Zhonghao nightmare. However, in order to save land resources and meet the needs of architectural beauty and use, this problem must be cracked.

"The problem of the basic pile body in the cave does not solve the problem of uneven settlement in this building. The most typical is like the Pizza tower in Italy. Zhonghao said. The solution to the problem is that it is stubborn in the soil that can carry the construction weight of the building. 1541 pile foundations, to bear the weight of two 150 -meter buildings. In order to ensure absolute safety, one of the longest pile bases reaches 142 meters, which is higher than the tallest building in China. More than 60 meters deep.

"After the exploration is completed, it is found that there are about 13 soil layers. We have to experience the friction of this sand layer for a long time, but its pile is within the range of 100 meters. , I encountered the cave again, so we continued to insert the pile down until we passed through the cave and entered the stable rock layer. "Zhang Zhonghao said.

However, a pile with a diameter of only 1 meter must be deepened by 142 meters underground. At the same time, when passing through the hard soil layer, there must be no displacement of more than 5 cm. This difficulty makes all architects daring.

"It is like a noodle. To insert into the soil layer, if the diameter of the pile becomes larger, it will form a group pile effect, but its carrying capacity is even more insufficient." Zhang Zhonghao said.

With a wealth of experience in the field of ultra -long and deep pile foundations and ultra -deep base pits, Zhang Zhonghao has completed a 100 -meter -depth pile foundation project under bad geological conditions. Falling on his shoulder.

Zhang Zhonghao led the team to integrate and benefit:

Can you refer to the karst cave geological pile technology and use the "smashing sledgehammer" to hit the pile? no! Underground contains different intensity and irregular crack filling, and it is biased as soon as it is smashed.

Is it okay to use the "bullet" drill bit? The pile is not biased, but it can't break the stone.

What about the "sharp knife" drill? It can break the stones, but encounters the junior drill at the junction of mudslides.

"Without such a case, then we have to innovate ourselves. We went to those places in Guizhou, Yunnan to investigate. After returning, we had 4 rounds of expert demonstrations. The third is the choice of mud with ratio. "Zhang Zhonghao said.

In the end, Zhang Zhonghao led the team to design a solution to use different drills with different geological environments: use the "bullet" drill bit to dig quickly, and when the stubborn stones are used to change the "strong knife head" drill, they also developed " "Drilling of the tooth wheel," carefully carved "at the junction of mudslides.

"I have to be fine and accurate to determine its process parameters in each soil layer. Fighting at the scene 24 hours, statistics on some parameters on the dials on the drill in real time." Zhang Zhonghao said.

"Look at those papers, until one or two o'clock in the morning, when we reach the specific construction, basically the hat is wearing, and sweat flows down like a steamer." Hong Kong said.

After 3 months, the 142 -meter pile finally succeeded in rooting on the banks of the Yangtze River. This pile was the deepest drilling pile of domestic super high -rise buildings under the constructive geological environment of the Yangtze River. Essence

"After the quality test, all these ultra -long piles we constructed were all qualified, and all of them were one type of piles. Everyone was very excited. We also solved the first technical difficulties of building a super -high -level high -rise in this bad geological cave. "Zhang Zhonghao said.

Zhang Zhonghao, who studied civil engineering, graduated from Inner Mongolia University of Technology for more than ten years. He has always fought on the front line of construction technology positions. In 2017, he was responsible for building the China and South Korea City Pavilion of Jilin Changchun. This is the first ultra -long span steel structure hanging building and the largest butterfly -shaped exhibition hall in the country. Facing the technical difficulties in the structure of Zhang Xianliang, especially the 90 -meter oversized construction, Zhang Zhonghao relied on technological innovation to create a full -wing butterfly skeleton.

"In the air of 28 meters high, in the football field as large as a span, I want to accurately confront two cylinders with a diameter of only one meter. The error cannot exceed 5 mm. This structural form, so these technical innovations have come out for the first time. "Zhang Zhonghao said.

1 international advanced: 90 -meter span string network shell Zhangxianliang installation construction technology

5 domestic leadership: 90 -meter span string mesh shell Zhangxianliang installation construction technology

Ultra -large metal roof anti -leakage technology under 70 degrees temperature difference

90 -meter span center of gravity plane outer tube truss arch technology

The deepest 142 -meter foundation technology nationwide under the rocky geology of the Yangtze River

Rock -soluble geological 80 -meter ultra -deep underground continuous wall technology

Over the years, Zhang Zhonghao has actively participated in the construction of construction technology innovation. He has developed more than 20 topics and more than 10 invention patents. 1 innovative technology has reached "international advanced" and 5 technologies to "leading domestic" level. In 2022, he received the May 1 Labor Medal in Jiangsu Province.

"Difficulties are not terrible. We can show the value of our engineering person after encountering difficulties. We must overcome difficulties before we can achieve better progress and greater development. I think this is the embodiment of our life value." Zhang Zhonghao said Essence

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Jiangsu Radio and Television Rong Media News Center reporter/ Xiao Shuai Xie Jian Wei Yuqing