The construction method that we propose is applied for decades in Europe. In Germany (where it was developed) a large proportion of residential buildings and offices (and other constructs) were built using this method.
Brief description of the system
The method is based on factory production of "double walls", i.e. wall-type sandwich which has two layers of concrete (see Figure 1a), and a gap between them. Those two layers of concrete are jointed together with a three-dimensional iron beam type “filigran” (see Figure 1b), placed at appropriate intervals.
Figure 1. a) Double wall, b) iron web beam
At the site, the double-walls are placed vertically one next to the other forming the building wall. The precast slabs are placed on the top of the walls forming the floor slab. Then, an extra reinforcement is positioned inside and between the double walls gap and on top of the floor slab. Finally, in-situ concrete is filling the gap of the double walls in order to have a monolithic construction.
Figure 3 shows the quality construction logic of the system.
The walls of the bottom floor are originally placed in position by a suitable crane (with or without openings, depending on the architectural design) and are retained in the final position with adequate lateral struts. The floor slabs are properly installed on the walls and subsequently additional reinforcement is placed in the plates and the body wall.
Σχήμα 3. Ποιοτική παράσταση κατασκευαστικής διαδικασίας