Wyniki wyszukiwania:

The retaining of tunnels is a very delicate operation where the slightest error can cause very important and very expensive damage to ensure better stability at work and make the right choice of digging methods, several precautions must be taken during the different phases ....Any project realization as important as the tunnels requires very great precautions. It is therefore unnecessary to specify the importance of the role played by the support in such achievements, it ensures at the same time the safety of staff and the site, and the stability of the excavation.