The extrusion technology, consisting of a conveyor system (screw
conveyor on the mixer) and a robot-guided tool head, generate the
concrete layers. A spray-extrusion multi-tool nozzle (SEMT) was
developed and implemented for the production of the concrete modules in
the robot-supported flow production process in order to avoid a changing
of tools in the production process while changing from the spray to the
extrusion technology. This allows a thin additive application of
material by spraying concrete and then the application of an adapted
concrete extrudate. For example, facade modules consist of a
fibre-reinforced shotcrete surface with a high surface quality and a
support structure made of extruded thin concrete, which is applied
directly to the shotcrete in the green state. On the one hand, the new
type of nozzle allows the concentric, fibre-reinforced extrusion of a
concrete layer and, on the other hand, the generation of a spray mist
through the controlled activation of compressed air and thus the shaping
by means of concrete spraying. The SEMT is attached to the robot arm,
using a quick coupling. The following table 2 summarizes the tool
parameters for testing.
Table 2. Tool parameters