Rentable tunnel formwork carriage with VARIOKIT construction set
One of the most important highway connections in Europe is the A7 motorway. It runs for almost 1,000 km from Denmark to Austria and through Germany in a northsouth direction. With the construction of the Reinertshof tunnel near Füssen, the final gap leading up to the Austrian border was filled.
The 645 m long tunnel with a double-tube rectangular cross-section was constructed using a cut-and-cover method. With two formwork sets, the advanced section - which was three cycles ahead - could be concreted at the same time as closing the remaining gap, each with lengths of 8 m. This accelerated the construction progress and reduced the actual site length, from the foundations to the finished tunnel, to a maximum of 48 m.
Walls and slabs could be constructed semimonolithically in one working stage with the PERI tunnel formworkcarriage. Here, the VARIOKIT construction set with mostly rentable standard components was used. Vertical support was provided by HD 200 heavy-duty props. SRU steel walers and RCS climbing rails were used very costeffectively as wall steel walers and slab beams. VARIOKIT diagonal bracing functioned as pressure joints.
The wall formwork could be hydraulically retracted on both sides by 10 cm. By means of the raise and lowering equipment, the complete carriage could also be hydraulically lifted into the required concreting position and subsequently lowered again. Electrically-operated drive units from the VARIOKIT range of accessories ensured fast moving procedures to the next cycle. The fact that only three rows of ties were needed in the walls resulted in an additional time advantage.
“PERI provided us with a practical and inexpensive solution as almost only standard components were used. The labour-saving and simple operations withthe hydraulic striking and shuttering device as well as the drive system reduced moving times to a minimum. It didn´t take five minutes to move a formwork carriage to the next position.”
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