Copyright (c) Hrvatske autoceste održavanje i naplata cestarine d.o.o. 2015.
The Krka River Bridge is located on the Skradin - Šibenik section. It is
391.16 m long and carries two traffic lanes for each traffic way. The
maximum permissible speed limit is 100 km/h. This bridge was built at
about 1 km downstream from the little town of Skradin in beautiful
scenery close to the Krka National Park. The works started in January
2003 and were completed in December 2004.
This is a reinforced concrete arch structure with a 204 metre arch span and a 56 metre rise. The foundations of piers, abutments and arch were executed in rock. The arch cross section is box-shaped with two chambers three metres high and 10 m wide. The arch was erected by free cantilevering using supports with temporary cable-stays arranged at three levels. The arch was erected symmetrically from both the Zadar and Šibenik side in full profile. Simultaneously with the erection of first twelve arch segments the execution of the steel span above littoral parts started. The incremental launching method was applied with the use of steel launching nose. Upon completion of arch, all cable-stays and pylons were removed and spandrel piers were executed. Afterwards, a steel part of the superstructure was erected by incremental launching from the Zadar side. In the final stage prefabricated reinforced concrete slabs were placed on steel grillage that are connected by concreting longitudinal and transverse joints.
Considering the vicinity of National Park the closed drainage system was installed with the two-side drainage gutters placed at cornices. The drainage system includes a number of structures that ensure controlled channelling of water from the road surface and discharge after purification in special water treatment plants. The complexity of the system meets the water protection requirements for the subject area.
Closed drainage system:
Stormwater from road surfaces are collected in gutters (channels by the road) and taken to the gullies with sedimentation tank. From gullies and through the pipeline and overflow structures the water is taken to grease traps where separation and sedimentation of oil and grease takes place. Grease traps are used for the intake of larger volumes of oil, grease and hazardous liquids as is the case in traffic accidents. Depending on the requirements of the water protection in the subject area with the grease trap outlet water is treated in lagoons where it is further treated and purified from heavy metals and other waste matters.
Owing to the importance of the structure, necessary equipment for permanent monitoring of important characteristics of some structural elements is foreseen for the entire service life of the bridge (monitoring). The installed sensors monitor the deformations, local temperature, concrete condition and the reinforcement corrosion on critical spots during use. The installed sensors are used for checking the condition of the structure during the bridge construction.