(pw) This is how concrete walls are created: after our architects have planned the wall, the structural engineer calculates the amount of iron in the form of mats and bars.
And for those who would like to know it very well: The structural engineer supplies drawings showing the position and overlap of the irons. According to these the craftsmen arrange the reinforcement on site. If all the irons are connected and the desired recesses are applied, the finished work is checked again. Afterwards, the wall can be sealed with appropriate materials and prepared for the conctrete.
Depending on the size of the surface, the concreting process is done quickly and the finished product can be stripped after about 24 hours.
