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Construction of Metro Station 4 - Part of Sofia's II metro diameter. Assignor: Metropoliten EAD

Site encompasses execution of metro tunnel and Metro station II - 4 at the section km 3+434 - km 3+584.
Metrostation II-4 is of the "platform" type with two vestibules and total length of 150,25 m

2009 - 2012

Site encompasses execution of metro tunnel and Metro station II - 4 at the section km 3 + 434 - km 3+ 584. Metro station II-4 is of the "platform"  type with two vestibules and total length of 150,25 m, including length of platform - 45,87 m. Metro station is 11,25 m. Metro station encompasses differentiated requisite underpasses, executed via open slope cut through excavation.
Metro tunnel is with total length of 889 m is constructed in open cut through consolidated excavation, consolidated by steel reinforced piles, steel pipe tensioners, anchros, and sprayed concrete, reinforced with steel mesh. Construction is  of steel reinforced concrete, monolithic, with box cross-section with clear opening dimensions at the straight section of 780/470 cm. Roof slab is 80 cm. Hydro insulation consisting of 10 cm protective concrete is placed over it.
Other facillities in connection with construction of metro section are: ventilation system and bridge over Suhodolska River.