System for extruding building material enriched with aggregates and/or steel fibres for the additive manufacturing of architectural structures

A robot for additive manufacture of architectural structures comprising:

• a positioning system, such as an articulated arm, controlled by a control unit, and
• an extrusion system comprising:
• a print head for printing filaments of construction material comprising a material inlet opening and an outlet nozzle configured to form filaments of material, said print head being intended to be moved by the robot along a predetermined path in order to form an architectural structure by stacking layers of said filaments,
• a circuit for supplying said print head with loaded material, comprising a reservoir for storing loaded material and a material supply conduit connecting said storage reservoir and said print head,
• wherein said supply circuit comprises at least one piston pump mounted on said supply conduit and configured to enable the loaded material to be conveyed from the storage reservoir to said print head without controlled adjustment of the flow rate,
• wherein said print head comprises an endless screw arranged between said inlet opening and said outlet nozzle and configured to be able to extrude the loaded material in a continuous manner via said outlet nozzle.

A method for extrusion of filaments of construction material enriched with rock fragments, of a size greater than 3 mm and less than 50 mm, referred to as aggregates, and/or rigid or flexible steel fibers having dimensions of 1 cm to 10 cm in length, referred to as loaded material, for a robot for additive manufacture of architectural structures, said method comprising:

• a step of supplying loaded material to a head for printing filaments of construction material,
• a step of extrusion of filaments of loaded material via a print head comprising an inlet opening for material and an outlet nozzle configured to form filaments of loaded construction material, wherein:
• said supply step comprises conveying the loaded material within a supply conduit fluidically connected between a reservoir for storing loaded material and said print head by action of a piston pump configured to enable the loaded material to be conveyed without controlled adjustment of the flow rate,
• said extrusion step comprises the movement of the loaded material within the print head toward the outlet nozzle by action of an endless screw arranged between said inlet opening and said outlet nozzle and configured to be able to extrude the loaded material in a continuous manner via said outlet nozzle.