The project involves the reconstruction of the railway superstructure and substructure, including the installation of the railway bridge steel structure, bearings, and expansion joints.
The existing load-bearing structure of the bridge consists of a steel plate girder structure with an open deck system dating from 1949, when the bridge was rebuilt. The substructure is formed by massive gravity concrete abutments with parallel wing walls. The bridge carries ŽSR utility networks (MK ŽSR, DOK+24p ŽSR).
As part of the comprehensive reconstruction of the railway substructure in the adjacent track section, and due to excessive corrosion of the steel elements, it is proposed to remove the entire load-bearing structure and replace it with a new steel plate girder structure with a bottom deck and continuous ballast bed. The new bridge structure will also meet the MPP 2.5 requirement.
The load-bearing structure will be supported on the substructure, following the removal of the necessary upper parts of the abutments, by means of four pot bearings. These will be placed on new bearing beams, which will be supported by micropiles founded in competent subsoil, ensuring that the beams are not seated on the original abutments. The new parallel angle wing walls of the bearing beams will be anchored to the existing bridge wing walls.
The selection of a girder structural system for a 24 m span is standard. A bottom-deck bridge system was chosen in order to minimize the structural depth of the load-bearing structure while maintaining, to the greatest extent possible, the clearance under the bridge for the Q100 flood level. The bridge span is 24 m, the total structural height is 2.46 m, and the construction depth ranges from 1.327 m to 1.343 m.
