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  Waterproofing in underground structures with synthetics membranes: the vacuum system, testable and reparable

  The waterproofing systems based on synthetic membranes for underground structures in the last 10 years have had a remarkable development: the need to move from the concept of "simple membrane" applied to a broader of “system” in fact meant that industry leaders should develop complex solutions able to offer increasing levels of security depending on the particular performance requirements for each structure to be waterproofed. In case of underground works and tunnels, considering thatthis types of waterproofing systems cannot be inspected during their life, the main problem to consider is not only how to check but also eventually to repair the waterproofing system at low costs and definable in advance. In underground works the waterproofing systems used in general do not allow to perform any full testing nor to make specific repairs of defined areas. This means on one side that the Construction Management does not have a valid instrument to approve the installed waterproofing system and on the other side that the repair costs cannot be defined in advance and often represent a dangerous question mark. The vacuum system is the only system of waterproofing of underground structures that allows a specific testing of the full waterproofed surface even during the life of the structures as well as the repair of the same for sectors with the possibility to define in advance the costs.

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