New drills for big dam

The units have produced 4.5 million cubic metres of rock for a dam project

Turkey’s Kolín Construction has taken delivery of a purpose-ordered DX800 drill rig, bringing its fleet of Sandvik rigs on Akköy hydropower project to five units – producing almost 4.5 million m³ of rock fill for the scheme's Gökçebel dam.

Five drill rigs are producing almost 4.5 million m³ of rock fill for the Gökçebel dam on Turkey’s Akköy II hydropower (HEPP) project.

The HEPP scheme is located some 150 km from Trabzon and close to Gümüshane in the Eastern Black Sea region of Turkey.

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It encompasses the Aladereçam regulator, the Gökçebel and Yasmaki dams and an electric power plant close to the Akköy 1 scheme also under construction, to produce a total of 890 GWh.

The Aladereçam regulator is being constructed at a ‘thalweg’ elevation of 1797 m directing water to the Gòkçebel dam lake through a 4.5 km long link tunnel with an inner diameter of 3.20 m.

The dam has been designed as a rock fill construction with a concrete coated front and a final height of 140 m.

Served by the Gelaver stream in the Gumushane and Giresun Province borders, Gòkçebel lake will hold an estimated 65.07 million m3.

The dam is in turn linked to the Yasmaki dam lake area at a ‘thalweg’ elevation of 1527 m via a 6.65 km long tunnel.

Yasmakli dam is a 100 m high concrete gravity dam on the Gavraz scheme in Giresun Province. The dam has a water holding capacity of 15.51 million cm³ to channel water into a 4 km long surge tank and tunnel.

Featuring a 1219 m high penstock makes it the highest head on an HEPP scheme in Turkey.