Reconstruction of the railway superstructure and substructure, installation of the steel railway bridge structure, bearings, and expansion joints
The existing bridge superstructure consists of a steel plate-girder structure with an open-deck bridge system dating from 1949, when the bridge was reconstructed.
The bridge substructure consists of massive gravity concrete abutments with parallel wing walls. The bridge carries the ŽSR MK and ŽSR DOK+24p utility networks. As part of the comprehensive reconstruction of the railway substructure in the adjacent track section, and due to excessive corrosion of the steel components, it is proposed to remove the entire existing superstructure and replace it with a new steel plate-girder structure with a through ballast deck.
The new bridge structure will also comply with the MPP 2.5 clearance requirement. After the necessary demolition of the upper portions of the existing abutments, the superstructure will be supported on the substructure by means of four pot bearings. These bearings will be installed on new bearing plinths, which will be supported along the bearing axis by micropiles founded in competent ground, ensuring that the plinths do not bear directly on the original bridge abutments. The new parallel angle-shaped wing walls of the bearing plinths will be anchored to the existing bridge wing walls.
The selection of a girder bridge structure for a span of 24 m is a standard engineering solution. A through-deck bridge system was chosen in order to minimize the structural depth of the superstructure and thus preserve the maximum possible clearance beneath the bridge for the Q100 flood level.
The bridge span is 24 m, the overall structural height is 2.46 m, and the construction depth ranges from 1.327 m to 1.343 m.
