“Caralte” Gallery (Italy)

The “Caralte” tunnel has a total length of about 1380 meters with a practically straight path. It consists of a single barrel with one lane in each direction of travel. The width of the road surface is approximately 7.2 meters with two small sidewalks on the sides of 1.3 meters. The greatest height in key of the vault is 6.6 meters.

The damages found in the tunnel are mainly of two types:

Degradation of waterproofing with numerous water infiltrations;
Degradation of the concrete with the presence of cracks, deterioration and gravel nests.

The planned intervention is divided into the following phases:

Hydro-demolition of the degraded surface part of the concrete,
Injections of polyurethane resins to close the cracks and prevent water from escaping,
Coating of the tunnel vault with a sprayable and waterproof membrane,
Finish with a coating of a few centimeters of spritz-beton