The highway grade-separated intersection on the south-east highway with 44th street in the city of Cali is composed of two coupled bridges for vehicle traffic. The superstructure is a post-tensioned cast-in-place concrete hollow-core box girder that in the straight sector has a constant depth of 5 ft (1.6 m), 40 ft (12.4 m) width (for three traffic lanes) and a total length of 393 ft (120 m), split in 4 continuous spans of 82+82+114+82 ft (25+25+35+25 m). In the curved sector it has a height of 4 ft (1.4 m), width of 22 ft (7 m) (for one lane of traffic) and 4 spans of 82+114+114+112 ft (25+35+35+34.3 m) for a total length of 424 ft (129.3 m). Both girders were built using a three phase segmental construction method.
Because of the high seismic activity in the subduction zone near the city, the viaduct substructure is composed of reinforced concrete piers and abutments protected with an isolation system of Lead Core Elastomeric Bearings. These reduce the seismic demands on the structure because of its flexibility and provide additional energy dissipation capability. This is the first application in Colombia of this kind of isolator on a bridge structure. The foundations are deep, using piles of 31’’ (0.8 m) diameter.
Design was carried out meeting the AASHTO LRFD requirements. The bridge is the first application in Colombia of Lead Core Elastomeric Bearings in these kinds of structures.
The segmental construction method used for construction avoided any interference with the traffic below and was used to complete the structure on time and budget.