Fort Regent Cavern Structural Survey

Fort Regent Cavern Structural Survey

Hartigan has been commissioned to assess the condition of the structures within the Cavern below Fort Regent in St. Helier. The Cavern is 25,000 cubic metres and receives unscreened sewage and stormwater overflows during heavy storms in Jersey.

The Outcome

The inspection focused on key structures, including the main access steelwork, gantry walkway, and escape shaft, with consideration of the site's industrial use. A detailed report and remedial works specification were provided.

How we did it

The investigation began with a visual inspection to identify defects and assess the need for more detailed or intrusive studies. After this, further testing and sampling were conducted. The steel survey, performed visually and tactilely where accessible, focused on identifying corrosion. In areas with significant corrosion, Vernier callipers were used to measure the remaining steel thickness. Hand tools were employed where necessary to expose and assess the condition of the corroded steel.

The Challenge

Although rope access was used not all members could be examined in close detail.