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: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:- 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 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:- non retaining open excavation with slopes;
 - 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
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