Excavation of new Sofia Metro line begins

Excavation of new Sofia Metro line begins

The excavation of the tunnel for the new Sofia Metro line begins on April 6. The tunnel boring machine (TBM), alternatively known as a mole, will dig the section of 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.The 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.The moles are designed to bore through hard rock and sand and just about anything in between. Tunnel diameters can range from a metre (done with micro-TBMs) to almost 16 metres to date. The Bulgarian one is among the biggest produced, according to Stroitelstvo, or of the Earth Pressure Balance (EPB) type  - specifically made for "softer soil with high water level" as are the predominant conditions under the capital.Public tender procedures for the third Sofia Metro line between the boroughs of Levski and Kniazhevo are currently ongoing.

Previous Next
Test Caption
Test Description goes like this
Cookies Preferences
Choose Type of Cookies You Accept Using

These cookies are required for the website to run and cannot be switched off. Such cookie are only set in response to actions made by you such as language, currency, login session, privacy preferences. You can set your browser to block these cookies but our site may not work then.

These cookies allow us to measure visitors traffic and see traffic sources by collecting information in data sets. They also help us understand which products and actions are more popular than others.

These cookies are usually set by our marketing and advertising partners. They may be used by them to build a profile of your interest and later show you relevant ads. If you do not allow these cookies you will not experience targeted ads for your interests.