Self-driving tunnel formwork adjusts hydraulically
to the changing cross-section geometry
The construction of the A5 motorway between Neuchâtel and Yverdon includes a 481 m long tunnel near d´Areuse. A feature of the tunnel project is the variable cross-sections in both rectangular tunnels.
Originally planned as separate construction units (five working cycles), this type of construction was quickly discarded for the much faster semi-monolithic construction method (three working cycles) favoured by PERI. The reason for this: walls and slabs can be constructed in one pour.
The formwork carriages take less than one minute to travel the 12.00 m to the next concreting section. The whole process for striking, lowering, traveling, cleaning and repositioning could be carried out by a three-man crew in only one hour. Limited by specified striking times, zone section was finished every two weeks.
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