Drytech carried out the renovation of some sections of the Milan Metro, during the night closure of the service, therefore without interfering with the normal circulation of trains.
The interventions were carried out with injections of DRYflex expanding resin in the joints between the floor and the inverted arch, for the entire thickness of the concrete structure of the tunnel.
DRYflex Resin is effective even in the presence of pressurized water. This made the intervention possible despite the huge extent of the infiltrations.
MM Line 2 was built between the 1960s and 1970s without waterproofing, because the water table was much deeper.
The closure of Milan’s manufacturing activities in the 1980s reduced water consumption and caused the groundwater level to rise up to the Line 2 tunnels.
The infiltrations were controlled by pumping systems active 24/7, but in periods of heavy rainfall some sections were still flooded.
It was therefore decided the renovation of some tunnels of the Milan Metro, carried out by Drytech during the night traffic closure.
Client: Metropolitana Milanese
