B433, Krohnstiegtunnel

Year of completion


Type of intervention

New construction

Contracting authority

Freie und Hansestadt Hamburg


New construction of the Krohnsiegtunnel Süd as waterproof construction, Enlargement of the existing troughs including partial demolition of the walls, Pressurised resistant connections, Waterproof concrete construction with a length of 10.50 m, Jointless concreting of the complete section, Completion in a dry construction site without lowering of the ground water



Type of structure

Road tunnel

Construction method

Sealing slab and slurry wall construction method

Total length

755,00 m

Construction width

12,50 m

Construction material

Masonry, reinforced concrete

Services Grassl

Preliminary design, detailed design, technical examination, consultant services for the client