The Foundations of the Railway Bridge Over the B25 in Donauwörth-PPT Presentation

PPT Presentation

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The presentation describes the modernization of a 1931 railway overpass carrying Deutsche Bahn’s Donauwörth–Treuchtlingen line over the B25 near Donauwörth, Germany. The existing bridge had experienced settlement-related damage, and the replacement was coordinated with improvements to the road.<br /><br />To meet a 10-day railway possession, the new bridge was built beside the existing structure and moved into place using a lateral bridge-slide procedure. Ground investigations revealed highly variable soils and a much thicker-than-expected layer of colorful breccia—up to 23 feet beneath the north abutment. The original plan for shallow foundations and soil replacement was therefore replaced with ground reinforcement using rigid inclusions. These transferred loads to the deeper, dense marine Molasse and were designed to limit settlement, including during the bridge move.<br /><br />Non-grouted ductile iron piles were selected for rapid installation, low vibration, and immediate loading after driving. A total of 398 piles were installed by four crews in 60 hours, from January 25–27, 2024. The approximately 4,000-metric-ton bridge was slid into position on January 28, and railway service resumed February 1. The B25 reopened February 9; the wider modernization project was completed in December 2024.

Keywords

railway overpass

Deutsche Bahn

bridge slide

rigid inclusions

soil reinforcement

settlement damage

ductile iron piles

Molasse

B25 Germany

Donauwörth