LINING & FORMWORK | PROJECTS
VARIED SOLUTIONS
A variety of formwork solutions has helped on a range of tunnels projects, from excavated road tunnels to immersed tubes, and more. A spotlight on the sights of a few recent and ongoing projects supported by Peri
Works of a range of tunnel projects use formwork for cast insitu concrete linings to excavated profiles as well as to help form free-standing large tunnel elements themselves, such as for immersed tube tunnels. Among projects across Europe recently there have
been road and rail tunnel linings that have employed formwork from Peri, or its subsidiary business Kern TunnelTechnik, such as: ● For the A26 road tunnels, in Austria ● Gubrist road tunnel renovation, in Switzerland ● The Divaca-Koper rail tunnel linings, in Slovenia ● linings for parts of HS2, outside London
Other UK projects have included the London Thames Tideway large diameter sewer tunnel, and the Hinkley Point C outfall tunnels. Formwork is also being employed on the immense
casting works for the 17.6km-long immersed tube tunnel being built between Denmark and Germany.
A26 ROAD TUNNELS, AUSTRIA Approach tunnels to the new A26 suspension bridge over the Danube have been under construction. The excavations are designed with concrete lining and varied types of formwork have been employed for the tasks. The tunnelling works have involved establishing and
lining five different cross-sections, requiring profile transitions, tight radii of between 50m and 750m in the bends, and varying gradients. For the casting works, Peri developed a customised,
fully hydraulic steel formwork carriage, weighing 250 tonnes, with a caterpillar drive - for movement, due to the tight curve radii. It was 8.07m high x 14.50m long, and its width changed from 11.20m (for casting) to10.70m (moving). The formwork system was used for concreting of different cross-sections for 170 parts of the tunnels. Prior to the casting work, a 6m-long mobile assembly
carriage on rubber tyres was used for sealing works, and then a reinforcement carriage passed in working 12m block lengths.
Left:
Formwork for variable cross-section on A26 tunnels, Austria IMAGES COURTESY OF PERI
12 | March 2025
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