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Denkendorf Tunnel, Nuremberg – Ingolstadt Rail Route, Germany
Keeping Construction Work On Schedule with Two Formwork Carriages
Using the Alternating Sequential Method
This 675 m long tunnel is part of the new Inter-City rail connection between Nuremberg and Ingolstadt and is situated in a heavily developed industrial area in the town of Denkendorf. A total of 54 tunnel segments were to be constructed with a constant internal cross-section but having varying wall and slab thicknesses of 80 to 110 cm and 80 to 125 cm, respectively.
There were 52 concreting cycle lengths of 12.50 m along the length of the tunnel with 10 m long sections for the entrance and exit areas. Tunnel construction was carried out using watertight concrete.
Due to unforeseen geological problems, construction work was put back for almost three years. To compensate for this delay, the client (German Railways) called for an accelerated construction programme. In consultation with the consortium, PERI designed, produced and delivered two complete formwork carriage units which meant that two tunnel segments could be constructed per week using the alternating sequential method.
Alternating sequential method
or the so-called Pilgerschritt principle
Here, the front form set is used to form the next casting segment whilst the second carriage closes the resulting gap. The front carriage controls the casting sequence as time-consuming details such as the fitting of waterbars and stopend formwork with shear key have to be taken into consideration.
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| PERI Systems In Use |
HD 200 Heavy Duty Prop
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Dipl.-Ing. Alexander Lenz Senior Contracts Manager (left),
Dipl.-Ing. Michael Hackl Site Manager (right)
“The integrated hydraulic system allowed our construction crews to lower, move and set up the formwork carriage with no problems whatsoever. Just one day after striking and moving the internal forms, we could carry out the reinforcement work. We didn’t regret our decision to use the PERI formwork carriage!”
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| Contractor: |
JV NBS Nürnberg-Ingolstadt Los Süd - Schaler Bau Berlin GmbH, and Berger Bau GmbH, Passau |
| Field service: |
PERI Germany, Berlin and Weissenhorn |
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Field Service:
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PERI GmbH, Germany
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PERI Handbook 2005 Formwork
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