Ingenieurbüro Robert Buxbaum
Schaffitzel Holzindustrie GmbH + Co. KG
Schwäbisch Hall, Germany
Schaffitzel + Miebach GmbH
Stahl- und Maschinenbau Graf GmbH
Krämmel GmbH & Co. KG
Maurer Söhne GmbH & Co. KG
City of Wolfratshausen, Germany
In October 2013, the "Walsersteg", a bridge for pedestrians and cyclists built across the Loisach river, was opened in the south of the old town of Wolfratshausen in Germany. The bridge connects the existing traffic ways on both sides of the river.
The uncovered bridge spans across the Loisach without any columns and has a pylon guyed on one side. The structure has a width of 3 m and a span width of 46 m.
An amount of 60 m3 of glued‑laminated spruce timber was needed for the deck to produce a block-glued beam with the width x depth dimensions of 280 x 44 cm.
The beam is cambered by approx. 40 cm and subdivided into three spans with single span lengths of 16 m (2x) and 14 m (1x). The joints are designed as full joints and are provided with transverse beams consisting of welded H‑sections (h/b/t/s = 400/500/40/40 mm) of steel grade S 355 in whose chambers the block beams were factory fitted accurately.
The ends of both transverse beams are stayed with cables (d = 40 mm) attached to the pylon head. The superstructure is retained on the river banks by two tieback anchor cables of d = 60 mm which are anchored by the substructures in the ground. The maximum cable force in the ultimate limit state is about 1,700 kN (design load). A total of around 130 m of full locked coil ropes was used for the guying and tieback anchoring.
The A‑shaped pylon is about 15 m high and consists of steel tubes (355 x 25 mm) of steel grade S 355. It is factory‑made and completely welded except for two bolted splice joints. The maximum axial force in the circular section is approx. 1,800 kN in the ultimate limit state.