Original title: 3D printing Zhaozhou Bridge appeared in Hebei University of technology, with a span of 18.4 meters, setting three world records
On October 13, the completion ceremony of fabricated concrete 3D printing Zhaozhou Bridge was held in Beichen campus of Hebei University of technology. It is understood that the fabricated concrete 3D printing Bridge completed by the team led by Professor Ma Guowei, vice president and President of the school of civil engineering and transportation, is the longest span, longest total length and largest concrete 3D printing Bridge in the world.
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It is reported that the bridge has a span of 18.04 meters and a total length of 28.1 meters. During the construction, it was assembled on site after printing according to the 1:2 scale of Zhaozhou Bridge. Not only the concrete materials were specially prepared, but also the 3D printing cement-based mechanical equipment was independently developed and designed, but also the load factors in the conventional design of various bridges were comprehensively considered, with a high safety factor. The successful completion of the pedestrian bridge can promote the rapid development of key technologies of intelligent construction, and is of great significance to the realization of green, industrialization and intelligence in China's construction industry.
According to Ma Guowei, concrete 3D printing is a new additive manufacturing technology that stacks cement-based composites layer by layer. Compared with traditional construction, 3D printing does not need formwork and support. It has the advantages of automation, rapidity and flexibility. It can use the special texture in printing to give special skin to buildings, and can also be used in the protection of ancient buildings, Accurately recovering the damaged and lost parts of ancient buildings can save about 1 / 3 of building materials and 2 / 3 of labor. The highly automated printing process can greatly improve the construction efficiency without increasing the cost due to the geometric complexity of the structure. Moreover, the combination of assembly design and 3D printing can greatly reduce the pollution to the on-site environment, It is an innovative technology to promote the development of prefabricated buildings and intelligent construction.
In addition, the fabricated concrete 3D printing Zhaozhou Bridge also uses embedded intelligent sensing technology, space and earth integrated health monitoring technology such as Beidou satellite and UAV, as well as the Internet of things cloud platform integration system, with the help of 5g wireless data transmission to escort the long-term health monitoring of 3D printing Zhaozhou Bridge. " These embedded sensors can monitor the health of the bridge 24 hours to ensure safe operation, but also reflect intelligent integration. " Ma Guowei said.
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The largest 3D printing ship in the United States has been certified by three Guinness World Records
A 7.6-meter-long and 2268 kg three-dimensional (3D) printing patrol boat was' launched 'in a laboratory of the University of Maine on the 10th, showing the prospect of 3D printing technology applied to the production of models and prototypes.
At the ceremony on the same day, Susan & middot, US senator representing Maine; Collins smashed a bottle of champagne at the bow of the 3D printing ship, then boarded the ship and 'sailed' in the University of Maine's' ocean simulator '. According to the associated press, the ocean simulator is like a huge 'indoor swimming pool'.
The University of Maine said in a statement that a 3D printer at the school's advanced structure and composite center spent 72 hours from September 19 to September 22 to print out the patrol boat. As a result, the center has obtained three Guinness world record Certifications: the world's largest polymer 3D sample printer, the largest 3D printing solid and the largest 3D printing ship.
The 3D printer used is 21 meters long, costs 2.5 million US dollars (about 17.79 million yuan), and can spray 226.8 kg of plastic polymer particles per hour. If you add accessories, it can grow to 30 meters and print objects with length, width and height of 30 meters, 6.7 meters and 3 meters respectively. The composite materials center of the University of Maine will study how to use 3D printing technology to enhance the competitiveness of the local shipbuilding industry.