about 5.000 m²
600 to 800 mm thickness
down to 45 m
46 barrettes excavated under bentonite
800 to 1.000 mm
30 to 70 m deep
installation of plunge columns in the barrettes to allow for a top-down construction
Pre-drilling of existing piles prior to execution of diaphragm wall by executing large diameter bored piles
Ø 1.500 to 2.000 mm
25 m long