Viaduct 21, ULMA’s emblematic construction project in Poland

The Y-shaped piers were built in three distinct phases. The tallest pier reaches 43 m in height without counting the deck above.The hollow rectangular bodies were built in 4.56 m pours with the VMK timber formwork system set on configurable BMK climbing brackets.

At the base of the column head, where the arms of the Y begin, single-sided UCAB-EUC formwork was used with the BMK brackets. The last section of the inclined structures was completed with the ATR self-climbing system and BMK brackets, together capable of matching exactly the predetermined angle of inclination. The self-climbing system was formed with MK trusses and a unique configuration of cylinders placed on the exterior face of the column arms.

The other pier type, with rectangular cross-section, curved sides, and a truncated-cone column head, was built in two phases. An adjustable circular formwork system was set to obtain the proper curvature, while the universal VMK system, adaptable to any geometry, was employed for the column head.

Videos about this project: video stage 1 and video stage 2