“Complex of Hydraulic Structures for Diversion of the Vorotan River Runoff to the Basin of the Arpa River”
The hydraulic work comprises the following main objects:
1. 21.6 km long tunnel with 8.9 m2 section,
2. 4 shafts with depths varying from 50 to 300 m,
3. 2 access audits,
4. Headworks: the intake, the gate tower;
5. Spillway section at the exit portal.
The construction was commenced in 1982, but for lack of financing the works on main structures were stopped in1993 and up to 1998 only the works on pumping were performed to upkeep the underground openings in working condition.
In the closing stages of works the construction of tunnel has been carried out under highly complicated hydrogeological and mining engineering conditions with frequent outbursts of rock mass on the stretch of about 800 m length in loose water-saturated rock, as a result of which the use of special drifting methods was made with formation of a screen of pipes along the outline of underground opening, injection of grout behind an auxiliary R.C. lining.
Implemented during the reported period were:
1. Rehabilitation works on the water intake and headwork structures,- hoisting mechanisms, gate shaft, power supply system, repair works on sluice gates, repair works on buildings and structures.
2. Rehabilitation and drifting of underground openings– 2140 linear
meter.
3. Excavation works – 38000.0 m3.
4. Placing of concrete and reinforced concrete – 17845 m3.
5. Erection of reinforcement and steel structures – 1393.2 Ton.
6. Laying of pipelines and of screen pipes – 197.4 km.
7. Injection of grout - 31113 m3.
8. Shotcreting works – 2850 m2.
9. Laying of power and lighting cables – 18.3 km.
The cost of works was 6999925.0 thousand Dram or 13070000 $US.
The Customer: Ministry of Urban Development of RA, State Enterprise Hydraulic Structures.
Address: Aharonyan Str., 3a, Yerevan City 375012, RA

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