The project, located at the northwestern part of the planned inner-ring road of Belgrade City, connects the industrial park on the southern bank of the Danube and the residential area on the northern bank. The main line of the project (including the bridge and accompanying roads) is about 21.2km long; the branch line is about 9.5km long. It is designed as a urban expressway, has two-way six lanes, 3 at-grade intersections, 2 interchanges, and a 1482m-long bridge crossing the Danube (Zemun-Borca Bridge) and 10 other bridges of different sizes.
After its completion, the project connects the northern ring road of Belgrade City, the capital of Serbia; the traffic time reduces to 10min from 1 hour; and it also greatly relieves the urban traffic jam in Belgrade City.
In July, 2010, Wu Bangguo, then-Chairman of the Standing Committee of the National People's Congress attended the bridge foundation stone laying ceremony during his visit to Serbia. In December, 2014, the main work of the bridge was completed, and Primer Li Keqiang of China and Prime Minister Vucic of Serbia jointly cut the ribbon for the completion of the bridge.
Zemun-Borca Bridge with Accompanying Roads Project is the first project after China and Serbia signed the cooperation agreement on infrastructure and also the first bridge the Chinese enterprises built in Europe, so it is called the “China-Serbia Friendship Bridge”.
This project is the first large project which was completed within the budget range with time and quality guaranteed in the past 20 years in Serbia, so it sets up a good image of Chinese construction enterprises, and it is really the first “card” of China in the Central and Eastern European infrastructure construction market.
For the main bridge, the symmetric cantilever construction of prestressed concrete variable cross-section continuous beams was adopted, and the span diameters were 95+172+95m. Because of the large construction difficulty, coupled with no level layer on the top of the superstructure of the project, the project department established the QC Group. Through the detailed calculation of pre-camber, optimization of mix proportion, surface finishing, formwork monitoring, pre-comprehension of hanging basket and 1.alignment monitoring, the elevation of deck shape of finished bridge meets the requirements for design.
For the beach bridge (6#-21# piers), the movable support system was adopted to cast prestressed concrete box girders in situ. In combination with the local construction conditions, the existing techniques were improved and optimized according to the local conditions. The push-type movable support system assembly technique, circuitous integral side sliding technique and self-walking section-by-section removal technique were created.
For 21—30# Piers of the Northern Approach Bridge, the scheme of prefabricated prestressed I beam was adopted. On October 30, 2013, all the I beams were prefabricated. From reinforcement fabrication to concreting and then to stretch-draw of prestress and later installation, all the processes were perfectly completed with a percentage of pass 100%.
The bearing platform of the main pier is located at alluvial deposit of the Danube. In order to overcome the problems of the construction environment, such as deep water, unstable mud line and complex geological condition, the deepwater cofferdam structure combining long rigid steel pipes and segmental flexible steel sheet piles was first created, and won the national patent.
The full-trestle technique was adopted locally for the first time, which greatly reduced the dependence on the large ship equipment. Because of this, the construction organization became more convenient and faster and the construction progress was accelerated, so it was recognized unanimous by the local industry circle.