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THE BRIDGE made of prestressed concrete across the river
Danube near Beska is a part of the motor highway Beograd
- Novi Sad - Subotica. The overall length of the
bridge is
2,250 m and width 14.40 m. The bridge has three carriageways of
the total width 11 m, and two footways 1.70 m wide each. This
bridge is a representative workmanship of the Yugoslav civil
engineering. The entire structure of the bridge was
determined by the heigh right hand bank and 51.5 m lower water flooded left
and bank of the Danube. In order to overcome a great difference
of levels, the bridge was designed in one direction
longitudinal inclination of 2.3% which is the greatest inclination on the
whole highway. The bridge structure is divided in the main structure
spanning the Danube and eight approach structures, one being on
the right and seven on the left river bank. The main
structure is the continuous girder over three spans 105 + 210 + 105 m with
overhangs of 15 m on both sides. Box cross-section with two
vertical webs is stiffened at every 9.00 m by cross
frames.
The cross section height ranges from 6.00 m in the centre of
the main span to 11.00 m above its supports. The web thickness and
the bottom slab thickness varies, depending on the static
needs.
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The bridge founding was done on 7 riparian structures
on the
left bank and one approach structure on the right bank with the
use of Franci piles.
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The main structure columns were founded in different ways:
- river piers on caissons;
- the pier towards the left bank on Franci piles dia. 50 cm;
- the pier towards the right bank on the drilled piles system
HW dia. 150 cm.
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The main structure was constructed without scaffold applying
gradual concrete casting with the cantilever method. 'The
technology of cantilever method of building was for the first
time
used for the span of 210 m, with us and in the world. All cross
section elements were performed with permanent tightening of
the carrying cables according to the stakes of work.
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