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Microtunneling in Bulgaria

“Stroitelna Mehanizatsia” AD completed the first of four drillings with a micro-tunnelling machine in the aim to build a pipeline during the reconstruction of the tailings dam of “Aurubis-Bulgaria”. The new pipeline will have diameters of 1200 mm and 1400 mm and a total length of about 600 m. 

“Stroitelna Mehanizatsia” AD completed the first of four drillings with a micro-tunnelling machine in the aim to build a pipeline during the reconstruction of the tailings dam of “Aurubis-Bulgaria”. The new pipeline will have diameters of 1200 mm and 1400 mm and a total length of about 600 m. The tunnelling machine that executed the work is owned by “Stroitelna Mehanizatsia” AD.

The microtunnelling is the most complex trenchless technology for constructing new pipelines. This technology allows very high accuracy in respect to direction and inclination of the borehole, as well as installation of pipes on a curvilinear trajectory. It allows a direct installation of the working pipes of fiberglass, polymer concrete and steel.

The microtunneling technology was first applied in Bulgaria in 2006 for installation of sewer pipes during the construction of the subway Station No.8, near Sofia University. “Stroitelna Mehanizatsia” AD was a contractor for the drilling, as a partner in the Consortium "Microtunnelling". Several drillings using microtunnelling technology follow the first experience in Plovdiv, Svishtov, Sozopol, Sofia, implemented by the company with its own microtunnelling machines.