CONCRETE | TECHNICAL


Above: A dozen ship loads were required to transport the special formwork PHOTO CREDIT: PERI


Above left: Concept of immersed of a Fehmarn concrete element at sea Above right: Formwork in preparation PHOTO CREDIT: PERI


concrete segments that make up a full element. The formwork enables a volume of 3,000m3


concrete to be constructed for a segment. Peri’s heavyweight formwork solution “forms the


foundation for monolithic concreting”, it says, reducing “the risk of water penetration during tunnel operation.” It adds that the approach also means the segments are cast without ties in the outer walls. “At the same time, the approach means considerable


savings in material and labour costs, thereby reducing the use of raw materials,” it says. The formwork specialist fabricated the steel


components in facilities in Poland, Italy and at its plant in Weissenhorn, Germany. It took more than 250


of reinforced


truck loads to transport the equipment to the 12 ship transports. This involved massive supply chain planning and execution in its own right, and tight co-ordination with the client says Peri, so as to feed into the complex construction programme. Getting this far has taken a long time in the overall


project development and timeline. The many parts of the construction jigsaw are coming together in a highly visible way, and on a gargantuan scale. Once completed, though, such a long preparatory time will likely come to seem distant when travellers come to almost zip through the world’s longest immersed tube tunnel – taking seven minutes by train, and only slightly longer by car, at perhaps barely 10 minutes.


July 2023 | 27


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