(basic construction scene of "3D printing house" technology)
Recently, the media has revealed that an enterprise can print out a whole house within 24 hours. So, what are the printing materials for such a "fast building into" building?
First of all, it can be determined that the buildings that can be printed in 24 hours are not "ordinary label cement" that is generally accepted in the world! Because the initial setting time of ordinary cement is 180 minutes, that is, 3 hours, and the cement can not be fully solidified within 24 hours.
Therefore, the building may only use the following materials: first, there is a good quick drying and a certain strength of "gypsum". However, gypsum has high water absorption, easy to deteriorate and other defects, which are very important to the structure of the house. Secondly, it is the "quick dry cement" which can stimulate the strength of cement through strong alkali. Although this kind of cement can dry quickly, it will be severely powdered in the later stage. In addition, it is all kinds of recycled materials such as mine tailings and construction waste. However, due to the uncertainty of composition of these materials, they have not been recognized by relevant national policies in terms of environmental protection or sustainability.
It can be seen that in order to print out the buildings that conform to the relevant construction specifications and standards in the existing national construction field, in the original aspect, the most secure is our common "ordinary concrete".
Basically, "ordinary concrete" is composed of cement, water, sand and large particles of stone. However, due to the limitations of technology, the relevant enterprises in the field of "3D printing house" in the world can only use "small particle fine" aggregate as printing raw materials, that is, gypsum, powder like recycled materials, etc. At present, there is only one enterprise that can use "ordinary asphalt concrete" as printing material and produce 3D printer "nozzle" which can spray out "large particle heavy aggregate concrete" with stones! And this enterprise is from China's Beijing Huashang land and Sea Technology Co., Ltd.
The overall printing of the construction process, seismic higher!
In the field of "3D printing house", there are two kinds of construction technologies, namely "overall printing" and "reasonable printing". Among them, the main technology of the expected printing is to assemble the beam, slab, column, wall and other building components in the construction site in the way of building blocks. There are many hidden dangers in the structural stability and earthquake resistance of Lego building.
To some extent, the buildings built based on the "3D overall printing" technology, because of its "integrated" stable structure, are even more "seismic" than the buildings built by traditional technology. However, due to its complicated "procedure flow" and huge "equipment structure", few enterprises can realize this technology in the world. However, it is gratifying to note that "the only Chinese businessman in the world who has achieved 'ordinary grade reinforced concrete' as the printing raw material" is the world's outstanding leader in this field.
In October 2018, Chinese merchants spent two months on land and sea, and successfully printed a "New Windsor Castle" with an area of more than 600 square meters. According to the relevant technical personnel of the enterprise, if the construction period of the building is at least 9 months according to the traditional construction process, and after using the 3D printing equipment of Chinese land and sea "direct pouring molding" technology, the actual construction period is changed to just 2 months. At the same time of shortening the construction period, in terms of labor and building materials, it also saves more than 60% compared with the traditional construction technology. During the building acceptance, "New Windsor Castle" fully complies with the existing national construction codes and standards!
(the New Windsor Castle built by Chinese merchants on land and sea with "overall printing" technology)
It is understood that the equipment used for such a large building as a whole is the "gantry building 3D printer" independently developed by Chinese merchants on land and sea. This kind of large-scale printing equipment can achieve "single house construction" such as bungalows and villas, and print "multi house construction" and "infrastructure construction" such as high-rise apartments, large-scale commercial buildings and underground buildings.
In terms of cost, the customized price of a single Chinese land and sea "gantry building 3D printer" from hundreds of thousands to tens of millions of enterprises is acceptable to most construction enterprises. Based on the intelligent programming program, the construction workers' learning of "3D building printing" technology has also dropped dramatically, which provides a larger space for the reserve of new technical talents in construction enterprises.
(China Merchants land and sea "gantry type building 3D printing equipment")
At the same time of realizing the overall printing of all kinds of buildings, at the beginning of 2019, Chinese land and sea also launched the "3D prefabricated building" industry section based on the "single building" assembly process.
It is understood that this new building mode, which is mainly aimed at the construction and transformation of private houses and small and medium-sized apartments, with the product concept of "vertical construction, horizontal use", can not only meet the actual residential needs of the resettlement industry, but also achieve the same standard level as "overall housing printing" in terms of the seismic resistance of the building.
According to the analysis of relevant scholars in the field of construction, the concept of "vertical printing, horizontal use" of Chinese land and sea is the best current solution of "3D prefabricated building" in the world. Because, no matter a single bedroom, or a single living room or kitchen, each overall functional room can better compact the structural density through the "vertical printing" construction scene, so as to enhance the seismic resistance of the single building; and then in the "horizontal use" use scene, to expand the other, it is worth noting that during the assembly process, through four lifting points, it can A few tons or even dozens of tons of single functional buildings are hoisted, so the super structural stability can only be realized by the unique technical advantages of "ordinary reinforced concrete" as the printing raw material of Chinese merchants on land and sea. Therefore, this kind of building, which can even be called "seismic shelter", is worthy of residents' trust.
To sum up, the author believes that for the direct beneficiary of "3D printing house" technology - construction enterprises, in the process of selecting suppliers of the technology, gimmicks such as "24 hours", "1000 yuan / m2 construction cost" and so on should be shielded, and more information such as printing raw materials and seismic resistance of printing building structures should be learned. Because, whether based on legal constraints or corporate responsibility, the quality and compliance of construction are the most critical.
Accordingly, for the output side of "3D printing house" technology, we should start from the perspective of construction enterprises and residents, just like "Chinese merchants, land and sea", and print out the real "living" house through practical technology research and development and practice, which is a corporate responsibility and obligation. Such achievements can also bring rich market returns to the enterprise.