Construction 3D Printing

Putzmeister introduces KARLOS, a mobile 3D printer for concrete walls

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Construction hardware specialist Putzmeister presented many innovations relating to the construction site of tomorrow at the bauma fair in Munich. The German company is looking at construction 3D printing technology to address low productivity and the shortage of skilled workers, particularly by introducing the mobile and highly automated KARLOS 3D printer.

The image below shows a solid wall straight from the 3D printer: With KARLOS, concrete walls can be built quickly – without any conventional formwork and with classic standard concrete. As a highly innovative combination of a mobile concrete pump and precise robot technology, KARLOS allows for a quick set-up on the construction site and a highly automated creation of walls.

This not only reduces manual labor and safety risks on the construction site but also enables more efficient and time-saving construction compared to conventional construction methods. In addition, the use of standard concrete with a maximum grain size of 8 mm, which can be supplied from conventional ready-mix concrete plants, creates considerable potential in terms of the cost-effectiveness of the manufacturing process.

Sustainability is also taken in consideration. KARLOS operates electrically and with low emissions on the construction site and creates the possibility to use CO2-reduced concrete formulations.

A major advantage of the technology is the digital consistency of the design and construction process. Planned components are extracted from digital building models and then translated into individual print layers. In the process, the print path and print speed are defined based on various parameters (opening time of the material, load transfer of the material, etc.). This path planning is then transferred into a machine control code and read in on the machine. KARLOS then prints the building layer by layer, automatically processing the plan.

Putzmeister introduces KARLOS, a mobile construction 3D printer to address low productivity and the shortage of skilled workers

KARLOS Technical Data

Printing application: Vertical walls in solid construction
Print width / print height: Up to 30 cm / up to 6cm
Set-up and dismantling time: Approx. 60 min
Printing material: Concrete up to 8 mm maximum grain size
Printing speed: 10 cm/s
Printing range: 26m
Chassis: MB AROCS 3743 8×4/4 / 5750
Max total weight: 32t
Power supply: Electric 125A
Support width at full support: 9.60 m

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