The Project
Impressions from the project process
The realization of starter units which form the foundation for the tunnel-in-tunnel. This area is formed with custom steel formwork. The two support areas – one for the rising wall, another for the prefabricated panel which is mounted at the end of all reinforced concrete work and subsequently forms the bottom carriageway slab – are clearly visible.
The rising walls are concreted directly on the starting units which in turn form the support for the upper roadway. Two MAXIMO Formwork sets ensure fast, efficient concreting of the 4.50 m high walls.
The slab was subsequently concreted by means of a total of six formwork carriages – constructed using the back-step construction method.
Shuttering and striking processes for the slab are supported by hydraulic components. All formwork carriages were designed with corresponding passageway openings for transporting materials in the direction of the tunnel boring machine.
The view from the north towards the already completed southern tunnel entrance.
Within the drilled tunnel tube with a diameter of around 17.50 m, a double-story road tunnel is being realized – mainly constructed using in-situ concrete together with a comprehensive PERI solution. (Rendering: Washington State Department of Transportation)
Project Information
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