With the continuous development of 3D printing construction technology, its impact on the entire construction industry is continuously deepening. A few days ago, "the world's first in-situ 3D printed double-layer demonstration building" successfully completed the main structure in Guangdong, meaning that China's architectural 3D printing technology has surpassed foreign counterparts in certain applications, and it is expected to change our lives in the future. A two-storey small building, 7.2 meters high, with a layer of stacked walls, gray in color. Today, such a small building seems to be very common in a skyscraper that stands out from the ground and many landmark buildings stand out. But what if this small building is "3D printed"? This small building is unusual.
On November 17, Guangdong Construction Base of China Construction Second Bureau. A tall metal frame stands on the ground, and a "printing head" that sprays concrete material is suspended from it, which can realize free movement in 3 directions of XYZ axis. At this point, the building's 3D printer that has been “inkjetting” for dozens of hours in a row has completed its work—this small building is its work. The small building has a famous name-"the world's first in-situ 3D printed double-layer demonstration building". Its speciality is that it is a "in-situ 3D printing" building, a building that directly prints the main body without assembly, and is also a double-storey building that was successfully completed using this technology for the first time. . At the same time, this also means that China's architectural 3D printing technology has developed synchronously with the international, and even surpassed foreign counterparts in some applications. From this perspective, this small building is unusual. 3D printing technology was born in the mid-1990s. It is generally believed that this is a technology based on digital model files that uses powdery metals or plastics and other adhesive materials to construct objects by printing layer by layer. It has applications in the aerospace and medical industries Applications in architecture are rare.
Huo Liang, assistant to the director of the Materials Engineering Research Institute of China Building Technology Center, said: "The basic principle of 3D printing buildings is the same as that of general printers, and there must be a printer body, nozzles, ink, and paper." Body, then the "print head" that sprays concrete is equivalent to the printer's nozzle. The "ink" used in architectural printing is not ordinary concrete, but a printing material specially prepared for printing construction. Of course, "paper" is also very important. Before construction, workers embed steel bars underground, which is equivalent to "paper". The print head continuously sprays 5 cm wide and 2.5 cm thick printing materials one circle at a time, and builds up the wall surface after layer by layer. In less than 30 hours, it can print a floor wall covering an area of about 120 square meters. . And in the printing process, as the wall continues to rise, it is also necessary to install reinforcing bars in accordance with the drawing to enable the "paper" to dynamically extend.
"Workers can make holes in the bottom of the wall while the concrete mortar has not yet solidified, leaving space for the welding of the steel cage in the wall and the steel bars in the foundation." Huang Huang, deputy manager of the Science and Technology Department of Guangdong Construction Base Co., Ltd. Yun added, "It feels like cutting a cake, which is quite easy to operate."