Bicycle bridge over the Töss, Wülflingen

The project
From a number of variants in covered and uncovered construction, a waisted truss bridge with inclined struts was chosen for execution. The preliminary studies and the preliminary project including structural analysis, design and cost estimation were part of an internship Stefan Zöllig completed at Ing. Büro Menig in St. Gallen. The scenic surroundings required great care in the construction and design of the new footbridge.

The construction
The Töss Bridge is a truss bridge with a length of 48.00 m and a width of 3.00 to 3.80 m. The deck is made of transversely prestressed planks 6 x 3 cm. The waisted deck consists of transversely prestressed planks 6 x 10 cm. It rests on double-guided transverse beams suspended from steel round bars. The struts are double-guided. They run from the support joint below the deck to the axles every 4.70 m at the truss. In addition to the stiffening deck slab, the primary wind bracing of parabolically laid, prestressed spiral wire ropes (Ø 25 mm) and the secondary wind bracing in sawn timber as St. Andrew's crosses are also used for wind bracing. All components are made of pressure-impregnated white fir.