Construction joint-stock company “Аdval” is established back in 1993 year by private investment and with main subject of activity- tunnel construction.

The Company executes hydrotechnical, road, railway and metro tunnels. The Company is the first one in Bulgaria, specialized in tunnel construction by NATM.

As a subcontractor of European companies and Consortium “Аdval” JSC takes participation mainly in tunnel construction works in Germany and Spain- drilling, shoring, placing of hydro-isolation and inner concrete, anchors, grouting works etc.

We are proud to say that we have executed more than 50km in metro, road and railway tunnels, including execution of tunnels by the “bottom- up method”.

The company personnel works with contemporary drilling equipment, excavation technique, loading and disposal machine equipment and machines for sprayed concrete by the “wet approach”.

The engineering staff uses all contemporary and advanced computer programs in tunnel construction and thanks to our long experience in West Europe it is in condition to tackle all modern challenges in this sphere.

The company “Аdval” also has specialized unit for production of metal construction, executed mainly for projects in Germany, which at the same time oblige us to fulfill all accepted standards of quality in Europe.