Cut & Cover Method
In cut-and-cover tunneling the pit remains open while the tunnel is being built. If space is not an issue the sides of the pit can be sloped as desired; this often applies when roads are built to bypass towns, for example. In built-up areas, however, space is generally very scarce and the pit is secured using supports in the form of bored pile, sheet pile or diaphragm walls. The tunnel tubes can be constructed by the segmented or partly monolithic method.
Segmented construction method
- Foundation, walls and top slab are cast separately
- Conventional wall and slab formwork can be used
- Detailed cycle planning on the site
Partly monolithic construction method
- Foundation is cast in advance
- Walls and roof slab are then cast in one step with a formwork traveller
- Round or rectangular cross-sections, manual to fully hydraulic operation: Doka will provide you with a custom tailored formwork traveller
Enclosure Tunnel Zürich-Schwamendingen
Gateway Gardens rapid-transit light-rail link
Formwork Systems & Services
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