Home / Projects / Roads, road tunnels and bridges / Hydrotechnical tunnels and shafts

Hydrotechnical tunnels and shafts

Yadentsa Dam

Yadentsa Dam

Permanent blasting materials storage - underground chamber type with capacity 21 tons of ammonium nitrate explosives and 27 000 detonating devices.
Gorna Arda Cascade, Madan Dam. Preparatory works

Gorna Arda Cascade, Madan Dam. Preparatory works

The contract comprises construction of the following facilities: Execution of N1 and N2 diversion tunnels with area of the cross section of 56 up to 58 m² and total length L=653 m of excavation and support lining using New Austrian Method. Entrance structures for the diversion tunnels with complicated concrete. Construction and system of metal pipes. Exit structures for the diversion tunnels N1 and N2 – excavation and consolidation works in the tunnels. Consolidation ...
Yadenitsa Dam reversible pressure tunnel

Yadenitsa Dam reversible pressure tunnel

Sub-project: Reversible pressure tunnel with L=690 m and Caisson mobilization excavation and supporting works. Settler for physical purification of construction water. Concrete on the bottom up to 684 m. Depositing of stone filling and extending of pipe culvert DN 1100 mmq 140 m. The purpose of the pressure tunnel is to connect the lower situated water reservoir of Chaira. Pumping - Accumulation Water Power Station Chaira Dam with Yadenitsa Dam and to increase the volume of the bottom water ...
Collecting Derivation Osina - Tunnel No. 5

Collecting Derivation Osina - Tunnel No. 5

Water from the river valley of Osina River are transferred into Dospat Dam by using the Collection Derivation Osina. The tunnel is law-pressure one with a cross section lower than the least necessary for mining works. This called for non-traditional building methods. Excavation works and transportation of the rocky material were carried out by using BOBCAT 751 S.