Turkish state railway awarded the Dogançay project to the main contractor Senbay-Özgün on 10 May earlier this year. The new 10km tunnel is being build in the city of Sakarya, with the purpose of cutting down the distance between two major cities, the capital Ankara and Istanbul.
Bayburt Group purchased seven Sandvik underground drill rigs for the project: five units of Sandvik DD321-40 and two Sandvik DT820s.
The excavation in the high speed railway project will be challenging due to fractured rock and weak types such as siltstone, clay stone and mudstone, Sandvik stated.
The project is set to be completed on 11 November 2013.
