ABSTRACT
Sveaborg (Suomenlinna) is an UNESCO sea fortress. The dry dock is built under Swedish, Russian and Finnish rule. Most of the concrete structures are made after Finnish independence (1917). The masonry debris of the wall face is concrete covered. The northern corner of the basin is supporting the floating gate. The corner restoration started in 2012 by grouted steel pipes. Anchors were drilled though the existing structure. A drainage system and reinforcement were installed, and concrete was poured. Instability of the damaged structures made the projects challenging and safety precautions had to be implemented at all work stages. By close monitoring, and the ability to resolve problems of the flowing water, the project’s first phase was successfully completed. The design water pressure is 95 kN/m². The second phase was undertaken in 2018 by repairing the drainage channels around the dock and repairing the wall faces and the floor.
