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BELGRADE - ICSRR & New Sava Bridge











Project Background

Belgrade, capital city of Serbia has a population approaching 2,000,000, generating approximately 35 to 40% of the GDP of Serbia. The city is located at the confluence of the rivers Danube and Sava. The old city of Belgrade was founded on the south bank on an easily defendable outcrop of limestone. The continuing expansion of the city northwards has been significantly constrained by the limited capacity of the existing bridges crossing the river Sava, creating a particular bottle neck increasing the level of traffic congestion in the centre of Belgrade. In order to reduce traffic congestion in the City of Belgrade and increase capacity on the network a third major road bridge across the Sava River being part of the Inner City Semi-Ring Road is under construction, situated 4 kilometres upstream from its confluence with the river Danube. The structure, including the appr
Design Concept

The new bridge has been designed as a landmark structure for the people of Serbia incorporating a needle shaped Pylon with a height of 200m. The steel Main 376m Span of the bridge is supported by 80 stay cables anchored at the Pylon structure and is counter-balanced by a post-tensioned, reinforced concrete back span of 200m. The approach towards New Belgrade is constructed as a 388m post-tensioned, reinforced concrete side span as continuous beam box girder with a similar arrangement of deck as the back span.

The deck has been designed to accommodate six traffic lanes with shoulders and a double track light rail line, in addition to two paths for the use of pedestrians and cyclists, resulting in and overall width of 45m. In comparison, a standard 6 lane highway bridge would generally have a deck width of approximately 28m to 29m. The overall length of the continuous bridge deck comprising 7 spans is 964m. The deck for the Main Span has been designed as a structural steel box girder of 4.75m overall height assembled by the free cantilever method crossing the river Sava 20m above water level. The decks of Back Span and Side Spans are composed of pre-stressed concrete and installed using the incremental launching method.


The 7 piers are founded on deep bored piles of 1.5m diameter, approximately 30m long. The Pylon is supported by a foundation designed as a composite “diaphragm wall-deep pile” footing, the diaphragm wall creating a cylinder 36m diameter and 37m deep with a central core consisting of a grid consisting of 113 cast concrete piles of similar depth. This design was developed in order to achieve the optimum economy whilst ensuring the stability of the supported structure.

The scale, complexity and advanced technology of the project structures, including the height of the pylon, length of the main span, width of deck and elevated casting yards as well as the limited construction time of 3 years are challenging conditions in international environment created by the participation of specialist companies and engineers from Serbia, Austria, Germany, Slovenia, China, Switzerland, France, United Kingdom, Denmark and Hungary.
Construction Sequence

The site works for the bridge began on April 14th 2009, following a period of extensive geotechnical investigations of sub-soil conditions and testing and approvals of materials to be used in the structures, simultaneously the preparation and approval of the design in coordination with the Contractor’s Programme of Works. A stipulation for the construction of the bridge is that the main span across the Sava River is achieved without using temporary supports located in the river. This constraint has lead to the adoption of free cantilever method supporting the deck with the stay cables in order to comply with this requirement, thus enabling an unrestricted passage for shipping. The critical path of construction activities is given by those milestones which affect the start of the free cantilever. This requires that the pylon needs to reach a minimum height of 130m and the Back Span must be connected to the pylon through the pier table together with the completion of the construction of the composite transition segment of the deck that creates the interface between the different forms of deck construction.
http://www.savabridge.com/home_en.htm
^^Web cams available

It will be finished by the end of 2011.
 
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