Procedure for the execution of underground work and perforating machine to put it into practice. (Machine-translation by Google Translate, not legally binding)

摘要

Procedure for the execution of underground works with the aid of a drilling machine, characterized in that, in case of risk of run-off, a mixture of reactive components capable of supplying a foam with a density between 20 and 20 mm is injected in the places exposed to this shift. And 120 kg/m3. (Machine-translation by Google Translate, not legally binding)