About us
« backAdval JSC was founded in 1993. The company specializes predominantly in tunnel construction and strengthening structures.
Adval is the first company in Bulgaria to adopt and apply the New Austrian Tunneling Method. The company performs anchors, drilling and grouting works and sprayed concrete.
In partnership with other well-known European companies and also individually, Adval participates in tunnel construction work in Germany, Spain, Greece and Bulgaria.
Since 2008, the company has been working as a main contractor in the metro construction in the city of Sofia.
In just less than twenty years Adval has executed the construction of over 50km metro (subway), highway, railroad and hydro technical tunnels.
