Motorway bridge over the Rio Sordo, Vila Real, Portugal
Bridge building with system: VARIOKIT heavy-duty shoring tower as falsework
The motorway bridge across the Rio Sordo is in the form of a 412 m long, five-section structure with two separate superstructures. The almost 20 m wide and 3.60 m high prestressed concrete hollow box girders are being realised using two different construction methods: the three middle bridge spans with the balanced cantilever method and the respective edge spans formed on PERI shoring.
30 m high falsework
As falsework, the contractor is using VARIOKIT VST heavyduty shoring towers – 6 m to 30 m high - with loadbearing capacities of up to 2,500 kN each. The VST towers are erected as four-legged individual structures which support the 72 m long superstructure formwork at defined load application points with axis spacings of between 10 m and 24 m. Transversely, the tower measures 2.00 m in each case, longitudinally between 2.00 m and 7.50 m – depending on topographical and static requirements. In those areas which are subjected to particularly high loads, additional legs with axis spacings of 37.5 cm provide an increase in the loadbearing capacities. The partial adaptation to the loads which are to be carried considerably reduces material requirements along with minimizing the erection work needed for the falsework.
Construction-site friendly assembly
Assembly of the falsework was carried out using variable frame arrangements with heights ranging from 1.25 m to 10.25 m. These are delivered to the construction site as pre-assembled units and then further extended on the ground to form tower segments. A crane was used for erection of the towers and height extensions. Safe PERI UP working platforms are used to ensure accurate positioning along with fixing in place with bolts and pins. Together with the heavy-duty shoring towers, these are continuously added to as required.
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