Baiersbronn Bridge

Designed to suit the rocky site, the bridge’s innovative structure offers a scalable, low-maintenance solution with potential for wider application, both within the region and beyond. Built primarily for pedestrians and cyclists, it will also accommodate occasional vehicular traffic.

Measuring 25m long and up to 6m wide, the bridge’s primary structure consists of block laminated timber beams with a stepped bottom edge. The beams were formed and glued over moulds in a factory setting and then delivered to site, where they served as the permanent formwork for the concrete deck, cast on top in-situ. The deck delivers a hard-wearing surface for bridge traffic. Along with edge detailing, it also protects the timber beneath from the elements. 

The outward lean of the glulam responds to the angle of wind driven rain, further reducing weather exposure. Using shear connectors, the concrete works in compression along the top of the structure, with the timber working in tension underneath, capitalising on both materials’ inherent properties and strengths.

The depth of the beams increases at the bridge’s midpoint, creating a gentle and accessible arc over the river, while elevating the relatively flat soffit above flood level. With the planar beams leaning outwards, the deck widens towards the centre, allowing users to pause and enjoy the view. A steel parapet accentuates the curving geometry, angling outwards to create a sense of connection with the river landscape. Owing to timber’s light weight, the team were able to reuse the abutments of the previous crossing, which had previously fallen into disrepair. This approach helped to contain costs while significantly reducing the project’s overall carbon footprint.

Following the completion of Balingen Footbridge in 2022, Baiersbronn Bridge represents Moxon’s second completed bridge in collaboration with timber bridge engineering specialist Miebach. It is the result of an invited competition held in 2021.