Two Bulgarian companies, Consortium BKS Centre – Balkanstroi and Metro Build 2010, have been selected for the construction of the north line of the Sofia Metro, a process which has to be completed inside 24 months, Stroitelstvo Gradut weekly reported on April 12 2010.
The excavation of the tunnel for the new Sofia Metro line commenced on April 6. The tunnel-boring machine (TBM), alternatively known as a mole, is tasked with digging the tunnel spanning from the Nadezdha interchange until the Patriarch Evtimii and Vitosha Boulevards junction.
The mole will have to excavate a total of 3.8km of tunnel, and according to the Sofia municipality, the machine will process 9.4 metres of earth a day at an average depth of 15 metres under the surface. Authorities say that the machine will work around the clock.
According to the report, for the section a total of 16 firms participated, Bulgarian, Austrian, Italian and Croatian, but the Bulgarian companies were selected for both sections of the north line, having tabled the lowest bid.
BKS Centre – Balkanstroi and Metro Build 2010 are entrusted with the metro section spanning from Obelya borough until Beli Dunav Boulevard. Balkanstroi tabled a 21.356 million leva offer including value added tax, for a section which is predominantly overground, while Metro Build's offer was 25.754 million leva for the part of the north line that will be subterranean.
The new new metro line tunnel must be excavated in full by July 2011.
The Sofia Metro mole was constructed between February and December 2009 at a cost of 15 million euro by German factory Herrenknecht, in Baden-Wurttemberg province. It took two months for the mole to be transported to Bulgaria, and another two-and-a-half months for it to be assembled, Dnevnik daily reported.
Text source: sofiaecho.com
Image: Maria Subotinova
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