We deal with: extrusion of steel protectors (DN 150-1800) of reinforced concrete pipes HOBAS Further: reconstruction and laying of new engineering networks (water supply, sewerage, cable ducts and other networks) Excavation of shafts and sheeting to a depth of 15 meters, Earthworks and excavation works Clearing and demolition work - soils, cellars and other premises mining activities to the extent according to § 3 of Act no. 61/88 Sb. mining authority