Yesterday, V house went to the big guy's location and contacted its builder. Come here and tell you a little bit.
What does it look like?
The big guy is located next to a factory building, which is different from the general building in four directions. The villa looks like a Western Castle, with gray walls, dark green conical roof and cylindrical walls on both sides of the main gate. The wall is not as flat as the traditional building, but in the form of thread.
The length and width are about 15m respectively. There are two floors in total. Each floor has six rooms, and the upper and lower floors have the same structure.
At present, the interior of the villa is relatively simple, without decoration. The interior wall is the same as the exterior wall, in the form of thread. The construction team is carrying out simple decoration on the second floor.
According to Wu Jianping, head of the builder Beijing Huashang Tengda Industry and Trade Co., Ltd., the villa was completed as early as the end of November 2015. Direct casting and molding, the formwork process is canceled, the construction period is only 45 days, and the mechanical construction reduces the labor cost by 80% ~ 90%. It is necessary to know that the construction period of a two-story villa with equal area is 3-6 months.
It is reported that this villa is a test product for testing 3D printing equipment and will not be sold.
Printing on the construction site by printer
In the factory next to the villa, v Real Estate saw this 3D "printer": 20 meters long, 6 meters wide and 6 meters high, with a large movable nozzle on the shelf.
It's it. It's reported that this is the R & D result of a team of more than 30 people after one year. This set of technology has applied for an invention patent and is currently under examination and approval.
According to Wu Jianping, there are four steps to print a building:
Mix the raw materials and mix the water content of concrete
Transport, transport the mixed materials to the printer
Printing, while fixing the prefabricated steel structure, the two tracks of the printer are placed on both sides of the steel structure, and the general scope of the whole building is fixed. After that, as long as the building drawing data is input into the printer's CNC system, the system will automatically control the printing nozzle, and pour concrete on the reinforcement according to the wall direction.
Is it safe?
Able to resist M 8 earthquake
"According to the national requirements for building design, a two-story building with an area of 200 square meters and the ability to withstand a magnitude 8 earthquake needs 5 tons of steel bars. But we used 20 tons. The walls and floor boards of villas are bound with steel bars according to the requirements of the construction industry specifications. C30 concrete steel bars are selected with high strength. " Therefore, Wu Jianping thinks that the seismic performance can reach the standard.
But Wu also admitted that due to limited funds, the building was not sent to the laboratory for testing. "The 3D villa has residential functions in terms of intensity, etc. It's just a question of whether the government departments are allowed to enter. Once approved by the government departments, the intensity of such villas is higher than that of ordinary houses. "
"Whether the safety of such 3D houses can be guaranteed does not lie in the 3D technology itself, but in whether the building materials, structures and subsequent safety related parameters and coefficients are implemented. The printed buildings do not represent insecurity, which has no inevitable relationship. In the past, the pouring of cement was completed by manpower and cutting machine, but now it has become a relatively standard and digital production mode, which has no strict equal sign or non equal sign relationship with safety. " Peng Jianbo, deputy director and senior urban planner of Tsinghua Tongheng Institute of planning and Design & urban development planning.
According to Peng Jianbo, through the optimization of structure, construction, design and other aspects, the anti-seismic ability of ordinary buildings is a required course, especially in areas with unstable geology. The seismic capability of 3D building is not the core superiority of 3D building over ordinary building. The core advantage of 3D architecture is that through a virtual construction mode, digital technology-based design and corresponding parametric production, rapid modeling and production and segmentation of material scale and building space.
How to overcome the problem that concrete can not set quickly
"We consider using reinforced concrete in the house and try not to use other materials, because reinforced concrete is a mature and commonly used building material," Wu said. Before using concrete, it is necessary to root from the foundation with steel bars. According to the existing specifications, it is the first time to use 3D printer to make concrete
The biggest problem, he revealed, was how to overcome the inability of concrete to set quickly. After the ordinary concrete is mixed, the wall is difficult to form because it can't solidify quickly. After continuous innovation of the research team, the concrete sprayed by this 3D printer finally solidifies and forms in 3 to 5 minutes, binding the steel bar.
It is reported that this printing construction technology has been developed for more than one year and has applied for a national invention patent. At present, it has passed the preliminary examination and there is still a stage of actual examination. After the examination and approval of the invention is completed, this set of technology can benefit the people.
There is still a long way to go into daily life
Peng Jianbo said that at present, due to the different scales, materials and structures of buildings, there are still challenges in 3D implementation for large-scale and complex structures. The impact of 3D technology on the construction market is relatively limited, and it is still in its infancy.
"Housing is not a simple parametric design and building block construction, but also needs to be people-oriented and consider safety, comfort and sustainability. At present, 3D printing is still a test product, which can only be used as an auxiliary design and construction method. There is still a long way to go into daily life. Next, 3D technology needs to be combined with the existing building construction and acceptance standards. " Peng Jianbo further explained.
Wu Jianping also said frankly that since the 3D printing house is still in the experimental stage, it is not a real building, and the real building needs to be approved by the relevant departments. At present, the country does not have the corresponding standards and specifications. "We hope to have a share in the market access in the future, and we are forcing the country's laws and policies. When the relevant policies come out depends on the government's ideas. But we don't want science projects buried. " Wu said.