LOT B3.2 – Belgrade Bypass -Construction of the Bridge over Sava River near Ostruznica
Introduction
Ostruznica Bridge over Sava River is the part of Belgrade Bypass Project. First phase of the bypass, i.e. one lane of the highway has been completed in 1999 and reconstructed in 2003 after demolition NATO bombing in 1999. Second phase is the clone of existing bridge.
Structure 8 – Main Bridge Structure
New bridge over Sava is, with its silhouette, clone of the existing bridge structure completed in the first phase. Piers of the existing bridge, performed in the first phase, have been designed to carry both steel structures.
Brief Description of the Bridge Structure
Total length of the bridge is 1,963m and it comprises 4 sections: prestressed concrete approach structures on the left riverside L=592.30m and right riverside L=699.13m, reinforced concrete structure over Belgrade-Obrenovac highway L=85.30m and steel structure over the Sava River L=586.00m. Steel structure over the Sava River is 5-span continuous steel girder, with box cross section of variable height, from 3.8m to 7.9m and with the longest span of 198m. The total weight of the steel structure is 4250 tons.
Bridge Steel Structure Construction
Constrution methodology includes:
- incremental launching over floating pier of the bridge (section previously assembled on the riverside L=187m)
- free cantilever assembly of the support segments above the river piers including temporary support for taking over impacts during the lift phase and transffering them to the piers
- lifting of 3 structure sections L=77m, weight of 550t each. Sections were preassembeld in the shipyard 10km far from the bridge location, launched into river and transported to the site
