Elb Bridge in Bad Schandau: Detailed Investigations Reveal Critical Concerns
Initial Closure and Preliminary Assessments
The Elb Bridge in Bad Schandau, Germany, has been closed since early November due to safety concerns. The closure was prompted by the unexpected discovery of longitudinal cracks in the underspan band, a crucial structural component, during a special inspection conducted in the wake of the partial collapse of the Carola Bridge in Dresden.
Both bridges employ Henningsdorfer prestressing steel, a material implicated in the catastrophic failure of the Carola Bridge. Consequently, the Bad Schandau bridge faces similar risks of stress corrosion cracking, believed to be the cause of the Dresden collapse.
Ongoing Investigations and Probe Sampling
Since the closure, thorough investigations have been underway to assess the condition of the Bad Schandau bridge. Initially, samples were collected from the underside of the structure. However, to gain a more comprehensive understanding, a novel approach involving sampling from above the bridge has been initiated.
Preparations for the topside sampling, including the removal of asphalt and examination of the concrete structure, are currently in progress. Prior to sampling, potential field measurements were conducted to pinpoint areas where the concrete, steel, and prestressing steel might exhibit critical deterioration due to salt damage and sealing issues.
Probe Collection and Closure Timeline
During the upcoming week, probe samples will be extracted from the identified areas, specifically from selected prestressing cables. The extracted samples will undergo rigorous laboratory testing to determine their condition and identify any potential structural weaknesses.
The probe collection sites are scheduled to be resealed by the end of February, and a comprehensive analysis of the samples is expected to provide valuable insights into the bridge’s overall structural integrity.
Temporary Traffic Restrictions and Future Plans
Following the closure, shipping traffic was quickly restored, but road traffic continues to be rerouted. A scheduled load test in April aims to provide further clarity regarding the bridge’s load-bearing capacity. If the results are favorable, limited traffic may be permitted starting in late April or early May, allowing the passage of passenger cars, light trucks up to 3.5 tons, and special-purpose buses.
Long-term plans include the construction of a temporary auxiliary bridge, which is currently in the planning stages. However, its completion is not anticipated until early 2026, necessitating ongoing traffic diversions in the meantime.
