Worldwide it may notice a relevant increase of Metro Projects; as a matter of fact in most of the cases new lines have to cross their path with existing ones. Due to these reasons, combined with the frequent need to encounter better geological conditions and, especially in Italy, having to solve the issue related to the preservation of the archeological heritages, tunnels, stations and technological shafts are often designed to be realized at deeper depth. Another topic is related to the very frequent limited construction space available; this is occurring especially in ancient towns, where station’s design need to take into consideration the space constraint, interferences with existing buildings and infrastructures. What the market has recognized in the last 2 decades is that trench cutter technology evolution has been quite and as a matter of fact the world is looking for something new since a long time (which probably will arrive very soon by LWN). What has been really, technologically speaking, evolving in the last decade is the “marriage” between heavy duty crawler crane and both mechanical and hydraulic grab. The well-known traditional diagraphram wall excavation has experienced new applications also in metro projects; deeper depth, higher accuracy, top joint quality, easy and fast mob & demob phases, limited site spaces available. Liebherr Werk Nenzing GmbH and Saos S.r.l. report of urban successful job site executed in Italy.
Subjects: foundation equipment, grab, lifting, Saos, Florence, Rome, Milan, LWN, Liebherr
Author: S. Bechter, G. Franco, F. Rossi and M. Bringiotti
Publisher: DFI, EFFC