In Lingyan Community Health Service Center, Liuhe District, Nanjing City, a two-storey building under construction "like a Decorative Cake" is stacked and growing tall, showing its embryonic form, despite its plain appearance, but behind it contains high-tech.
It is the first truly habitable and deliverable two-storey building made by on-site 3D printing, with a height of 6 meters and a usable area of 52.8 square meters. It will be built by Shanghai Construction Engineering Group and will be used as an exhibition hall of Academy history after completion. Chen Xiaoming, chief engineer of Shanghai Construction Engineering Group, said: "On the road of intelligent construction exploration, large-size 3D printing construction is the priority development direction of Shanghai Construction Engineering."
CREATIVE TECHNOLOGY is a
truly habitable and deliverable
3D printing building, also known as Shanghai Construction Engineering 3D Printing Technology Test Building Project. It is one of the demonstration projects in the national key R & D projects led by Shanghai Construction Engineering Group. Shanghai Construction Engineering, Southeast University and Nanjing Jiayi Precision Machinery Manufacturing Co., Ltd. have jointly formed a project team. The two-storey building printed
in situ will eventually be put into use as the hospital history exhibition hall of Lingyan Community Health Service Center in Liuhe District, Nanjing. It takes about 50 hours to print the whole building at the
printing site
. The 3D printing equipment independently developed and manufactured by the project team, the 3D printing concrete materials independently developed, and the building structure originally designed have laid an important foundation for the smooth implementation of on-site printing.
At present, this equipment on site is the first in-situ 3D printer in China to realize the pumping of coarse aggregate concrete materials. The printing range is 24 meters long, 8.5 meters wide and 6 meters high. The nozzle diameter of the printing head is 40 mm and 50 mm, which can realize the intelligent in-situ 3D printing construction of super-large buildings and structures.
Printing equipment is in place, and the "efficient cooperation" of printing materials is more needed. The 3D printing concrete material developed by the project team was used on site, and the 3D printing concrete material containing coarse aggregate was first used locally in the in-situ 3D printing: the ready-mixed concrete containing coarse aggregate was transported to the printing bin through pumping technology, and then extruded by the printing head after secondary mixing in the printing bin. The use of
coarse aggregate can not only reduce the cost of materials, but also solve the problem that 3D printing mortar is easy to crack. The project team has also developed solid waste materials for 3D printing, which is in line with the current development concept of solid waste recycling, energy saving, emission reduction and environmental protection.
At present, the biggest challenge in the promotion and application of 3D printing buildings is the lack of corresponding perfect standards, so the project team pioneered the design of "frame + masonry + laminated slab structure" 3D printing buildings that meet the current standards. The self-supporting wall and local column and beam formwork are completed by 3D printing technology, and the frame structure is used as the load-bearing structure. The successful design of the 3D printing building structure creates an important condition for the delivery of the project.
Printing site
CREATIVE TECHNOLOGY
Shanghai Construction Engineering's constant exploration
of intelligent construction is one of the important directions for the development of China's construction industry during the "14th Five-Year Plan" period. Chen Xiaoming, chief engineer of Shanghai Construction Engineering Group, said: "On the road of intelligent construction exploration, large-size 3D printing construction is the priority development direction of Shanghai Construction Engineering." Over the years
, relying on a number of major national scientific research projects, Shanghai Construction Engineering has conducted in-depth research and engineering practice on 3D printing technology, equipment and materials of polymer materials and high-performance concrete materials.
"In 2019, the first 3D printing bridge of Shanghai Construction Engineering was completed in the central green space of Taopu, Putuo, which is also the first polymer material landscape bridge formed by 3D printing technology in China." Chen Xiaoming said, "In the same year, in Quanzhou, Fujian Province, Shanghai Construction also built a polymer material 3D printing sectional pre-assembled pedestrian landscape bridge with a total length of 17.5 meters, a width of 3.2 meters, a height of 3.2 meters, and a net weight of 12 tons, which was printed in five consecutive weeks."
Taopu Central Green Space 3D Printing Bridge
last year, the "Liuyun Bridge" in Chengdu Yima River City Park was also built by Shanghai Construction Engineering, which is the world's first polymer material landscape bridge with the largest span completed by 3D printing technology so far. The main part is 21.58 meters long, 8 meters wide and 2.68 meters high. With a net weight of 12 tons and a total length of 66.8 meters including the approach bridge after the completion of the overall assembly, the innovative use of "sectional printing, prefabricated assembly technology" and a long space artistic conception have become a place to punch in. The 3D printing bridge
in Yima River City Park in
Chengdu, Shanghai Construction Engineering, has also used 3D printing technology to create a "point view" building integrated with the surrounding environment in many gardens and green landscapes in China.
Xuzhou International Garden Expo 3D Printing Seats
Shanghai Fengling Greenbelt 3D Printing Seats
Chengdu Eastern New Area East Line Extension 3D Printing Seats
in the construction process of the two-storey building in Nanjing. Shanghai Construction Engineering's attempt at 3D printing technology for high performance concrete is an important manifestation of its continuous exploration of a new mode of architectural design and construction.
3D printing has a wide range of applications in the construction of complex, personalized and customized buildings and structures, and also has broad application prospects in extreme construction environments such as disaster reconstruction, nuclear power plants, lunar bases and so on. This demonstration project explores a new way of building modern houses, which can realize large-scale industrial production of buildings, and will help the domestic construction industry to improve the level of intelligent construction and lean construction.
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