Employer: Global Wind Power A/S, Denmark
Contractor: Geotechmin OOD
Project implementation period: 2008 – 2009

Description of the project:
Geotechmin OOD is commissioned to construct foundations for 14 wind generators in Dobrich region – 6 units in Kamen Bryag village, 1 unit in the town of Kavarna and 7 units in the town of Shabla. The wind generators are model Vestas V90 with a nominal power of 3 MW. They are 105 m tall and weigh 70 tons. The diameter of their rotor is 110 meters.

Structural parameters of the foundations:

• foundation dimensions – 18/18/2.7 m
• depth of excavations – 3.5 m
• amount of reinforcement installed in a foundation – 52 tons
• amount of concrete laid in a foundation – 800 cub.m.

In addition to the construction of the foundations, Geotechmin is also commissioned to execute all cable works. 52 km of power cables with cross section 185 sq.mm are laid in trenches with dimensions 1.2/0.6 m. Three complex distribution devices with remote control are erected to monitor the work of the wind turbines.

The project also includes construction of 15 km of roads and 14 crane stations (dimensions 30/50 m) for positioning of the 1,000-ton mobile crane which is used for installing the wind turbines.

Conducted works:

• excavation works – 16,000 cub.m.
• reinforcement works – 728 tons
• formwork – 2,700 sq.m.
• concrete works – 11,000 cub.m.
• flanges for fixing of the turbines' towers – 14 pcs.
• crushed stone for roads and crane stations – 360,000 tons
• geotextile for roads and crane stations – 100,000 sq.m.