Knurów, Poland

GDDKiA in Katowice (General Directorate for National Roads and Motorways)

Mine expertise. Technical condition inventory and technical expertise of expansion joint devices. Basic and detailed design for the replacement of expansion joints in the axes of supports 2 and 5. Basic and detailed design for the replacement and rectification of bearings in the continuous part of the flyover running over the railroad tracks. Inter-industry coordination. Construction and detailed design of the new highway tie beam.

CADmost, WLC Inżynierowie

Construction works in 2022.

The flyover was designed as a composite slab-and-beam structure (steel girders and a cooperating reinforced concrete slab), with 15 spans simply supported and 4 spans in a continuous arrangement. The girders are supported via pot bearings on reinforced concrete abutments and column pillars, founded indirectly on drilled piles. The total length of the superstructure between the extreme support axes is 824.00 m. Modular expansion joints were used between the simply supported spans. This solution was adopted due to the foundation of the structure in areas of mining damage.

Due to the technical condition of the expansion joints and the noise caused by vehicles driving over the degraded joints, it was decided to carry out modernization work. In 2020, an inventory of the technical condition of the expansion joint equipment and bearings was carried out. A mine expertise was prepared to determine the impact of past and prospective mining operations on the deformation of the site and the facility. Replacement of 2 pieces of complete expansion joint equipment and repair of the remaining equipment in terms of bearing of traverse beams was designed.

In partnership with the CADmost design office, technical documentation was prepared for the replacement of expansion joints in the axes of supports 2 and 5, as well as the replacement and rectification of bearings in the axes of supports 16 and 18. The project involved scraping the slab in a section to extract the failed joints, followed by the insertion of new ones, completion of reinforcement, concreting, insulation and paving.

As part of further upgrades to the facility, noise was reduced through the use of additional acoustic covers for expansion joints, and access platforms were installed to facilitate inspection of the facility's condition.