Top-down construction method. In most common construction methods, buildings with underground parts are built by the bottom-up method where sub-structure and super-structure floors are constructed sequentially from the lowest level of basement to the top of the building. Though this conventional method, also called a bottom-up method, is simple in both design and construction, it is not feasible for the projects with limited construction time or with site constraints (size of location, legal iss

In the TOP-DOWN basement construction system, from top to bottom, the slabs bracing the perimeter walls and the piles executed at the beginning of the works. It is used to save time, but especially when you have to watch closely the lateral movements of the terrain. | Civil Engineering&Architecture