3D printing house, it sounds very magical. In the industrial zone of Songzhuang Town, Tongzhou District, Beijing, the reporter saw the 3D printing villa covering an area of 400 square meters. The villa building is next to the building, with a dark gray exterior wall. It is deep but different from the traditional four-way buildings. The villa belongs to "special structure". From the front, the side with glass door in the middle is square, and the two sides are nearly vertical arc-shaped walls. Unlike the walls of the traditional buildings, the walls of the 3D printing villa present a kind of annual cake The thread structure of.
The 3D printer does not use ink, but unlike the high-tech materials such as nano materials used in aerospace, medical and other fields for 3D printing, this villa uses ordinary concrete, which is completely consistent with the traditional building. , but the adhesive has chemical composition, which is easy to change over time. That kind of villa material is reinforced concrete, which is suitable for the requirements of the current construction industry. " Wu Jianping, head of Beijing Huashang Tengda Industry and Trade Co., Ltd., the builder, said.
At present, the interior of the villa is relatively simple, without decoration. The interior wall, whether it is a small 3D printer or a "super printer", is printed in layers, that is, the materials are stacked in layers, and the appearance will look like a circle of threads. The surface is the same as the outer wall, in the form of thread. The interior walls of a one story house were whitewashed. Wu Jianping said that the decoration of the interior walls of the villa is basically simple whitewashing, without other complex decoration, saving the original 3D printing.
Wu Jianping told reporters that previously, 3D printing buildings at home and abroad were printed out in advance of part of the structure of the house and then assembled. Instead, they were villas. The walls on all sides were directly printed on the construction site through 3D printers, which belonged to "overall printing". 3D printing is mainly for walls. Printing such a villa took only 45 days. How does a 3D printer print such a "big guy" in such a short time? According to the construction video provided by Wu Jianping at that time, the printer consists of two tracks, two brackets and a large movable nozzle. Wu Jianping said that to print a building, a total of four steps are required. The first step is electronic batching; the second step is to mix the prepared raw materials and mix the concrete content; the third step is to transport the mixed materials to the printer; the last step is to print, fix the steel structure and change the two tracks of the printer to be placed in two of the steel structure respectively, and frame the overall scope of the whole building. At this time, as long as the building drawing data is input into the printer, each layer of the printer can be made 10 cm high, and the human performance is more like an "intelligent brain". Every time it hits a floor, it will not only print the walls around the villa, but also the walls that separate each room. At the place where the windows are needed, the system will automatically stop spraying concrete. The biggest problem for printing such a villa is how to overcome the problem that the concrete can not be solidified quickly Wu Jianping revealed that after mixing the ordinary concrete, the wall is difficult to form because it can't solidify quickly. After continuous innovation by his research team, the concrete sprayed by the 3D printer finally solidifies and forms in 3 to 5 minutes,
It is reported that Beijing Huashang Tengda Industry and Trade Co., Ltd. has applied for a national invention patent for this 3D overall printing construction technology, which is currently under examination and approval. Wu Jianping has been working in the construction machinery and equipment manufacturing industry for 40 years. He knows the value of printing villa: if we use the traditional building method to build a two-story building with equal area, it will take about 3 months to half a year, and the labor cost will account for about half of the total construction cost. However, 3D printing technology can directly pour and form, cancel the formwork process, greatly reduce the project cost, and mechanical processing can reduce 80% to 90% of the labor cost, accelerate the construction speed and shorten the construction period.