Low-rise buildings and transport facilities selection

2016

METROSTATION „VITOSHA“

METRO – SOFIA, II-ND LINE, METROSTATION „VITOSHA“ (MS II-12) – PROJECT FOR EXTENSION OF SECOND LINE PAST METROSTATION “JAMES BOURCHIER” (MS II-11)

Client:	SOFIA MUNICIPALITY / "METROPOLITEN" Jsc.
Architecture:	"KONKURENT-90" Ltd.
Main contractor:	ALLIANCE "METRO CHERNI VRAH 2013"
Facility length:	217,40 m
Facility width:	18,80 m
Facility height (depth):	10,75 m
Design:	Architecture, WSS, Geodesy, Structures, HVAC, Plan & Profile
Built-up Area (BUA):	3 760 m2
Excavation with retaining structure:	RC diaphragm walls
Building technology:	"Top-down"
Main structural material:	cast in place reinforced concrete
Characteristics:	- "Milan Method" roof slab;
	- 4 blocks and a pedestrian tunnel, separated by expansion joints;
	- (external) retaining structure - diaphragm walls supported by the roof slab;
	- internal structure - walls, columns, slabs and beams;
	- 2 side platforms;
	- 2 entrance-halls at both ends of the station;
	- 7 different exits;
Phase/stage:	in operation since 2016

TRANSPORT FACILITIES – “STRUMA” HIGHWAY

DESIGNING AND CONSTRUCTION OF “STRUMA” HIGHWAY LOT 3.3 – PASSINGS FROM KM 397+000 TO КМ. 420+624

Client:	NATIONAL COMPANY "STRATEGIC INFRASTRUCTURE PROJECTS"
Architecture:	PARTERSHIP COMPANY "VIA PLAN - AMBERG" SOFIA
Main contractor:	CONSORTIUM "STRUMA - LOT 3.3"
Design:	Structures
Main structural material:	cast in place reinforced concrete
UNDERPASS 1 - at km. 400+220
Characteristics:	- non retaining open excavation with slopes;
	- single span rigid box-type frame;
	- clear span distance - 9 m;
	- clear height of structure - 6 m;
	- 2 equal blocks, separated by expansion joint;
	- total length of the facility - 30,3 m;
	- highway traffic above the roof slab;
	- trapezoidal retaining walls at both ends of the facility;
UNDERPASS 2 - at km. 402+140
Characteristics:	- изпълнение по открит способ в неукрепен изкоп с откоси;
	- single span rigid box-type frame;
	- clear span distance - 9 m;
	- clear height of structure - 6,3 m;
	- 2 different blocks, separated by expansion joint;
	- total length of the facility - 36,6 m;
	- highway traffic above the roof slab;
	- trapezoidal retaining walls at both ends of the facility;
UNDERPASS 3 - at km. 404+474
Characteristics:	- изпълнение по открит способ в неукрепен изкоп с откоси;
	- single span rigid box-type frame;
	- clear span distance - 9 m;
	- clear height of structure - 6,7 m;
	- 2 equal blocks, separated by expansion joint;
	- total length of the facility - 30,3 m;
	- highway traffic above the roof slab;
	- trapezoidal retaining walls at both ends of the facility;
UNDERPASS 4 - at km. 406+125
Characteristics:	- non retaining open excavation with slopes;
	- single span rigid box-type frame;
	- clear span distance - 9 m;
	- clear height of structure - 6,3 m;
	- 2 equal blocks, separated by expansion joint;
	- total length of the facility - 36,7 m;
	- highway traffic above the roof slab;
	- trapezoidal retaining walls at both ends of the facility;
CANTILEVER WALLS from km. 412+840 to km. 413+051
Characteristics:	- 6 different types with various lengths and heights;
	- horizontal footings with inclined stems;
	- angle of inclination toward the back fill - 20÷30˚;
	- flat and smooth front face;
	- stepped variation in heights of different types of walls;
	- waterproof expansion joints at every 20 m;
Phase/stage:	under construction

2015

PEDESTRIAN BRIDGE TO SOFIA TECH PARK (above “Tsarigradsko shose“ blvd.)

“EXPERIMENTARIUM AND VISITOR’S CENTER WITH PEDESTRIAN BRIDGE” (BUILDING B) IN SCIENCE AND TECHNOLOGY PARK, SIA (SCIENTIFIC AND INDUSTRIAL AREA) EAST, „KARO“, MLADOST, MUNICIPALITY OF SOFIA

Client:	"SOFIA TECH PARK" Jsc.
Architecture:	arch. Ivo Petrov
Main contractor:	PARTERSHIP COMPANY "EXPO TECH PARK"
Bridge deck length:	51 m (additional steel structure for bridge widening)
Bridge deck width:	2 m (additional steel structure for bridge widening)
Bridge deck height (thickness):	1 m (additional steel structure for bridge widening)
Design:	Structures
Building technology:	steel superstructure (bridge deck) over a reinforced concrete substructure (walls)
Main structural material:	cast in place reinforced concrete and structural steel
Characteristics:	- 5 single supporting pillars (walls) across the bridge and above;
	- additional steel structure for bridge widening between the inner three pillars;
	- 2 RC staircases with multiple cantilevered stringers (treads and risers only with no stringers);
	- 2 elevator shafts - RC foundation and vertical steel frame structure;
Phase/stage:	in operation since 2016

2014

METROSTATION “BUSINESS PARK SOFIA”

METRO – SOFIA I-ST LINE; METROSTATION “BUSINESS PARK SOFIA” (MS I-16), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “GEOTECHMIN” Ltd.

• situated in the northwest part of the complex Business Park Sofia, under the intersection of blvd. “Alexander Malinov” and str.“Samara”;
• total length - 166m; clear width of the concourses – 19.0m, width of the platform area – 16.2m;
• two concourses at both ends of the station – each with two staircases;
• two underground parking levels with two adjacent inside ramps and one outside ramp;
• third underground floor with platforms at both sides of the station;
• railway ~12.5m under the ground level;
• retaining of the excavation – diaphragm walls with width of 60 cm; propped by anchors;
• inner structure – reinforced concrete walls; four longitudinal blocks separated by expansion joints; flat slabs; reinforced concrete columns; diagonal “N”-shaped supporting joints;
• different methods of construction: the north concourse is built by open cut-and-cover method; the south concourse and the platform area – by “top-down” method; reinforced concrete diaphragm walls, supported by the intermediate slab at the level between second and third underground floor;
• the roof slab and the slabs at first and second underground level have spans of 17m;
• the diagonal “N”-supports – placed between the parking spaces, reducing the span length of the slabs;
• the slab at the south concourse is additionally supported by two rows of cast in-situ piles (ϕ60cm) and is anchored to the diaphragm walls;
• flat foundation slabs with thickness of 70cm;
• in exploitation since 2015.

METROSTATION “AKAD. AL. TEODOROV-BALAN”

METRO – SOFIA – 1-ST LINE, METROSTATION “AKAD. AL. TEODOROV-BALAN” (MS I-15), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “GP GROUP” Ltd.

• the metrostation is parallel to blvd.“Aleksander Malinov”; its north part is situated under the intersection of str. “Akad Aleksander Teodorov-Balan”and str.“D-r Atanas Moskov”.
• total length 166.5m; platform length – 100m;
• the whole station is situated in horizontal curve line;
• northern concourse with two staircases; middle platform part with two platforms along both sides; south concourse with two entrance/exit staircases;
• width – 22m at the concourse parts; 15.25m – at the platforms;
• the concourses are designed with two underground levels – the first one for passengers, the second one for technical rooms;
• structure – reinforced concrete walls, columns, flat slabs;
• north concourse – open cut-and-cover method; doubled structure with diaphragm walls, 60cm thick;
• flat foundation slabs with thickness of 60cm;
• roof slabs of the concourses – thickness 55-70cm, supported by walls and intermediate columns;
• roof slab in the platform area with thickness 70-80cm, supported by the walls at both sides;
• north concourse – executed by open cut-and-cover method;
• south concourse level and platform part of the station – open excavation with slopes and set-backs, according to the geological conditions;
• in exploitation since 2015.

METROSTATION “ALEKSANDER MALINOV”

METRO – SOFIA – 1-ST LINE, METROSTATION “ALEKSANDER MALINOV” (MS I-14), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “GP GROUP” Ltd.

• the station is situated under blvd.“Aleksander Malinov”; the northern part is under the intersection with str.“Filip Avramov”; the southern part is under the intersection with str. “St. Kipriyan”
• total length 171m; length of platform – 90m;
• north concourse with four staircases and two lifts; middle platform part with two platforms on both sides; south concourse with two entrance/exit staircases and two lifts;
• width – 21.5m at the concourses; 14.8m – at the platforms;
• the concourses are designed with two underground levels, the first one is for passengers, the second one - for technical rooms;
• the middle part has a platform level for passengers and a level under the platform - for installations;
• reinforced concrete structure – columns, flat slabs, walls under the platforms, diaphragm walls along the outer perimeter for retaining of the excavation - 60cm thick; joints between them and the slabs – by reinforced concrete dowels;
• roof slab of the concourses with thickness of 55-70cm; supported by diaphragm walls and columns;
• roof slab in the platform part with thickness 70-80cm; supported by diaphragm walls at both ends;
• north concourse – executed by open cut-and-cover method;
• south concourse and platform part of the station – by “top-down” method; order of execution: roof slab concreted on the terrain, supported by pre-executed diaphragm walls; the excavation is performed under the roof slab;
• in exploitation since 2015.

2013

METROSTATION “ISKARSKO SHOSE”

METRO – SOFIA – 1-ST LINE, METROSTATION “ISKARSKO SHOSE” (MS I-21), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “TRACE GROUP HOLD” Plc.

• the south-west part of the metrostation is situated under the intersection of blvd.“Iskarsko Shose” and blvd. “Kr. Pastuhov” and the north-east part of the station is under the industrial zone “Gara Iskar”;
• pedestrian underpass at the north-west end of the station (over the metro tunnel) – underground connection with the new-built train station “Gara Iskar”;
• total length - 144m; length of the platform – 87m;
• south-west concourse with three staircases and two elevators; middle platform part with platforms at both sides; north-east additional level with two entrance/exit staircases and one elevator;
• width – 22.1m and 18.1m at the concourse areas; 15.1m for the platforms;
• the concourses are designed with two underground levels – first for passengers and second for technical rooms;
• the middle part is with platform level for passengers and level under the platform for installations;
• the railway is situated ~9m under the ground level;
• pedestrian underpass with length of 97m – three staircases and one elevator near the train station;
• reinforced concrete structure – walls, columns, flat slabs; doubled structure with diaphragm walls along the outer perimeter for retaining of the excavation – thickness 60cm;
• flat foundation slab with thickness of 50cm;
• roof slab of the concourses with thickness 50-60cm, supported by diaphragm walls at the ends and intermediate columns (pre-executed piles ϕ 60cm);
• roof slab of the platform part with thickness 70-80cm; supported by diaphragm walls at both sides;
• the south-west concourse and the platform part of the station are built by “top-down” method: roof slab concreted on the terrain and supported by pre-executed diaphragm walls and piles, than the excavation is performed under the roof slab;
• the north-east concourse, pedestrian underpass and metro tunnel are executed with with open cut-and-cover method;
• in exploitation since 2015.

METROSTATION “DRUZHBA”

METRO – SOFIA – 1-ST LINE, METROSTATION “DRUZHBA” (MS I-20), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “STANILOV” Ltd.

• The metrostation is situated between blvd.“Tzvetan Lazarov” and str. “Kapitan Dimitar Spisarevski”, in open free area without adjacent buildings, easy accessible;
• total length 144m; length of the platform – 97m;
• south concourse with two staircases and one elevator; middle platform part with two platforms at both sides; north concourse with one entrance/exit staircase and one elevator;
• width – 22.5m for the concourses and 15.5m for the platforms;
• the concourses are designed with two underground level – first one for passengers and second one for technical rooms;
• railways ~10m under the ground level;
• in the middle platform part of the station the roof slab is partially executed at lower level to allow the transition of the highway heating pipes – ϕ1400 and ϕ1000mm;
• structure – reinforced concrete flat slabs, columns and walls along the perimeter;
• flat foundation slab with thickness 65cm;
• roof slab with thickness 60-75cm;
• executed by open cut-and-cover method, according to the geological conditions; the slope is treated with sprayed concrete and soil anchors;
• in exploitation since 2015.

ROAD JUNCTION "SOFIA RING ROAD – SLIVNITSA Blvd."

ROAD JUNCTION "SOFIA RING ROAD – SLIVNITSA Blvd.", CLIENT: ROAD INFRASTRUCTURE AGENCY; CONTR: CONSORTIUM “TRACE SRR”

three-levels road junction (part-underground, ground - and high level with overpasses);

the underground level is Sofia Ring Road;

the overpass level is blvd. “Slivnitza”;

ground level – roundabout between SRR and blvd. “Slivnitsa”;

direct local roadways;

design of all main elements and facilities of the road junction; for the estacades another structural design is developed;

main part of the design – ramps and two round bridges;

reinforced concrete structure;

the two bridges are designed with the so-called “top-down”method (excavation works for the ramps, in the middle part of the roundabout and under the bridges are made under their slabs);

the bridges are two-spanned frames with length of each span 14m.;

stiff connection between the superstructure and the substructure of the bridges;

the sidewalks are part of the slab structure;

the structure will be finished by the end of 2014.

ROAD JUNCTION “LAVOV MOST”

TRANSPORT ROAD JUNCTION “LAVOV MOST”, CLIENT: SOFIA MUNICUPALITY, CONTR: CONSORTIUM “LAVOV MOST” – “PATPROJECT 2000” Ltd.

three-levels road junction with three types of public transport – vehicle, tram and subway);

two highways along blvd “Slivnitza”, that go in tunnels under the ground and above the subway station;

roundabout on the ground level connecting the highways with blvd. “Knyaginya Maria Luiza”;

two new round bridges above the river “Vladayska”;

the tram railroad remains along the bridge “Lavov most”;

the structure is designed from cast in-situ reinforced concrete;

the construction is designed as separate blocks with deformation joints;

additional design of retaining structures, reinforced concrete collectors, shafts and steel bridges (for ingeneering infrastructure)

in operation since 2014.

SOFIA RING ROAD: SOUTHERN ARC

SOFIA RING ROAD: SOUTHERN ARC – BRIDGES AND FACILITIES - BETWEEN “MLADOST IV” AND BLVD. “TZARIGRADSKO SHOSE”; CLIENT: SOFIA MUNICUPALITY/ MUNICIPAL ENTERPRISE "SOFPROEKT – MASTER URBAN SPATIAL DEVELOPMENT PLAN"; PHASE: INITIAL DESIGN

2012

INTERSECTION “AKAD. IVAN EVSTRATIEV GESHOV” Blvd. – “BULGARIA” Blvd.

INTERSECTION “AKAD. IVAN EVSTRATIEV GESHOV” Blvd. – “BULGARIA” Blvd.; CLIENT: SOFIA MUNICIPALITY; CONTR: “BALKANSTROY" Jsc.

two-levells intersection;

first level – existing roadways and tram railroad;

second level – roundabout (that will improve the traffic capacity of the road junction)

ramps at the four sides of roundabout;

the roundabout will be supported by stay-cables, connected to the inner-and the outer parts of the circle;

stay cabels – connected to a solid independent central pier and four additional outer piers, that also support the ramps’ structure;

the advantage: no need of supports right under the roundabout; the adjacent green areas and the underpass aren’t affected;

the piers and the other columns will be supported by reinforced concrete pile foundations; length of piles – between 20 and 35m

roundabout reinforced concrete structure: horizontal beam-grid (ring-shaped slab with ring-shaped and radial beams) with great stiffness, supported by the stay-cables;

the design is developed in technical phase in 2014 and is submitted for approval in January 2015.

2010

METROSTATION “BELI DUNAV”

METRO – SOFIA – 2ND LINE, METROSTATION “BELI DUNAV” (MS II-2), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “GP GROUP” Ltd.

the station is situated under the intersection of blvd. “Lomsko shose”and “Beli Dunav” Str.;

at both sides of the station the structure has two levels - parking lots above the metrotunnel;

“BIAS-M” designed the metrostation and the tunnels with parking levels, and also developed the architectural design for the parking lots;

tunnel part before the station with length: 130m; width: 18m; 2 levels; 100 parking spaces;

tunnel part after the station – length: 330m; width: 13.5m; 2 levels; 300 parking spaces;

at both ends of the stational - additional levels with parking lots; the comunication between the levels and between the parking and blvd. “Lomsko shose” is with ramps;

metrostation: length:130m; width: 23m; average depth: 12.5m from the ground level to the railway level; 2 levels – platform level and intermediate level;

excavation retaining structure - with reinforced concrete diaphragm walls;

mat foundation;

inner structure – reinforced concrete walls (doubled-construction), columns, slabs and beams;

roof slab (2 types): type І – “top-down” method - the roof slab is supported by the reinforced concrete diaphragm walls and the excavation is made under the slab; type II – standart cut-and-cover (bottom-up) method;

in exploitation since 2012.

METROSTATION “NADEZHDA”

METRO – SOFIA – 2ND LINE, METROSTATION “NADEZHDA” (MS II-3), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “GP GROUP” Ltd.

under blvd. “Lomsko shose”, between districts “Nadezhda-1” and “Nadezhda-2”

the metrostation has the following parameters: length - 120m; width – 16m; it is the “shallowest”station - average depth: 5.5m from the ground level to the railway level; only one intermediate slab at the platform level;

direct connection with the street level (only one staircase);

design of additional pedestrian lateral underpass under the station;

construction by open cut-and-cover (bottom-up) method; excavation retaining structure with reinforced concrete cantilever diaphragm walls;

mat foundation connected to the diaphragm walls by concrete dowels;

the roof slab is supported by the diaphragm walls and one row of columns in the middle part (between the railway tracks);

in exploitation since 2012.

METROSTATION “LAVOV MOST”

METRO – SOFIA – 2ND LINE, METROSTATION “LAVOV MOST” (MS II-7), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR: " Doğuş Construction and Trade " Inc.

under the intersection of blvd. “Slivnitza”and blvd. “Knyaginya Maria Luiza”; under the bridge “Lavov most” and “Vladaiska” river;

the structure consist of two parts: metrostation (130m long) and pedestrian underpass part (long 70m);

clear width of the station: 17.0m at the north part and 26.3m at the south part;

average depth: 15.25m from the ground level to the railway level;

the platform is situated in the middle part of the station;

two additional levels at both ends of the station are designed – connected with staircases and elevators;

reinforced concrete frame structure; divided in two parts (determined by the technology): part І – “top-down” method; reinforced concrete diaphragm walls, supported by one row of anchors; part II – open cut-and-cover method; reinforced concrete diaphragm walls – cantilever or supported by two rows of anchors;

the mat foundation is U-shaped in the middle part – for TBM (Tunnel Boring Machine) passing;

inner structure – reinforced concrete walls (doubled-construction), columns, slabs and beams;

in exploitation since 2012 year.

UNDERGROUND PARKING LOT – PARK “VAZRAZHDANE”

UNDERGROUND PARKING LOT IN PARK “VAZRAZHDANE”, ”ZONA B 5-4”, “VAZRAZHDANE”, SOFIA; total floor area: 5 200sq.m.; CLIENT: SOFIA MUNICIPALITY/ MUNICIPAL ENTERPRISE "SOFPROEKT – MASTER URBAN SPATIAL DEVELOPMENT PLAN"; ARCHITECTURE by: “BIAS-M”Ltd.

2009

METRO STATION “JAMES BOURCHIER”

METRO – SOFIA – 2ND LINE, METROSTATION “JAMES BOURCHIER” (MS II-11), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: "GEOTECHMIN" Ltd.

next to intersection of blvd. “Cherni vrah”and blvd. “James Bourchier”

the deepest metrostation in Sofia – 26m from the ground level to the railway level;

three or four intermediate levels - most of them are for parking lots ~ 650 spaces.;

metrostation length: 210m; clear width 18m;

tunnel part after the station: 216m; with parking levels, clear width of 18m;

underground levels – divided to two separate sections with adjacent ramps;

reinforced concrete structure;

retaining of the excavation – reinforced concrete diaphragm walls; length up to 33.5m; width 60 cm; supported by one, two or three rows of anchors;

roof slab - constructed by the“top-down” method ; supported with diaphragm walls at the ends and in the middle of the span by single diaphragm wall acting as column;

roof slab - executed in two stages with longitudinal technological joint; the roadway could be used during the execution; post-tensioned reinforcement;

inner structure – mat foundation, reinforced walls (doubled-construction), columns, slabs and beams;

in exploitation since 2012 year.

SUBWAY TUNNEL LOT – FROM METRO STATION “MLADOST 1” TO METRO STATION “MLADOST 3”

METRO – SOFIA – 1ST LINE, LOT FROM METRO STATION “MLADOST 1” TO METRO STATION “MLADOST 3” – CONSTRUCTION FOR VENTILATION INSTALLATION BETWEEN THE STATIONS AND THE ADJACENT TUNNEL PART, CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: CONSORTIUM “METRO MLADOST”

location: alongside blvd. “Andrey Saharov”, in south-east direction, next to blvd. “Aleksandar Malinov”

the structure is devided to three separate sections with deformation joints;

first section – two-levels underground structure; first level – metro tunnel, second level – ventilation system with collector; in the process of construction the block is used as launching shaft for the excavation of the next part of the tunnel (New Austrian Tunneling Method);

second and third sections – one-level with metrotunel; before the execution of the inner construction in these blocks are developed tempopary ramps for transport of the excavated earth;

reinforced concrete structure;

retaining of excavation – mostly with diaphragm walls, at the part with ramps – solid reinforced piles (static scheme – cantilever); 1st block – the diaphragm walls are supported by one row of anchors and diagonal struts in the end parts; 2nd and 3rd blocks – with additional steel struts;

outside structure of the launching shaft – “top-down” method; retained by reinforced concrete diaphragm walls and the excavation is made under the roof slab,

the construction of II-nd and III-rd part – open cut-amd-cover method;

inner structure – reinforced walls (doubled-construction), mat foundation and roof slabs;

in exploitation since 2012.

REPOSITION OF THE TRAMWAY ALONG BLVD. “SKOBELEV”

REPOSITION AND RECONSTRUCTION OF THE TRAMWAY TO BLVD. “SKOBELEV” – IN THE PART BETWEEN BLVD. “VITOSHA” AND BLVD. “HRISTO BOTEV”; CLIENT: SOFIA MUNICIPALITY/ MUNICIPAL ENTERPRISE "SOFPROEKT – MASTER URBAN SPATIAL DEVELOPMENT PLAN"; CONTRACTOR.: “TRACE GROUP HOLD” Plc.

SOFIA RING ROAD: SOUTHERN ARC – PHASE 3

SOFIA RING ROAD: SOUTHERN ARC - PHASE 3 – BRIDGES AND FACILITIES – CLIENT: SOFIA MUNICUPALITY/ MUNICIPAL ENTERPRISE "SOFIA PROEKT "; PHASE: INITIAL DESIGN

2008

BRIDGE FACILITY

BRIDGE FACILITY, “GARDOVA GLAVA”, “VITOSHA”, SOFIA; CLIENT: “CAPO GRAIN” Plc.; ARCHITECTURE by: “LS ENGINEERING LYUBOMIR SEMERDZHIEV ARCHITECTS AND ENGINEERS” Ltd.

2003

DIAPHRAGM WALLS FOR RETAINING OF THE EXCAVATION FOR METROSTATION “JOLIOT CURIE”

METRO – SOFIA – 1ST LINE, DIAPHRAGM WALLS FOR RETAINING OF THE EXCAVATION FOR METROSTATION “JOLIOT CURIE” (MS I-10), CLIENT: "METROPOLITAN" Plc.; CONTRACTOR.: “BKS-CENTER” Plc.