Gasometer Bridge
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Project description
On behalf of the City of Schlieren, Stahlton carried out a GPR survey of the post-tensioned Gasometer Bridge. Using the Proceq GS9000, the team mapped the concrete cover and the layout of the tendons across the deck. Based on these results, a targeted inspection opening was positioned at the tendon, where the condition of the duct and grout was verified visually. All data was documented in INSPECT, giving the project engineer a clear basis for planning the next steps – with a minimum of openings.
AQUILA’s contribution
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The Gasometer Street Bridge in Schlieren, Switzerland is a four-span post-tensioned road bridge from 1988 over the SBB railway tracks near Zurich, and its owner needed a reliable basis for its repair planning and 2027 budget, with a focus on the prestressing.
Our process
Bridge B-235
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Project description
For the Canton of Aargau, Stahlton assessed the condition of the post-tensioning in Bridge B-235. The inspection was carried out in two phases in 2025, one per traffic direction. Tendon layouts were mapped with GPR, and ultrasonic pulse-echo measurements identified potential grouting defects. Selected locations were verified through inspection openings and anchorage checks, complemented by a visual inspection. All findings were consolidated in INSPECT, providing the canton and the structural engineer with a reliable basis for maintenance decisions.
AQUILA’s contribution
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Aerial view of Bridge B-235 during the inspection campaign with half-side lane closure.