First bridge structure using CPC slabs in the Hanover region

The municipality of Wennigsen had a wooden pedestrian and bicycle bridge, over 40 years old, replaced with a new bridge structure. SKI Ingenieurges. mbH of Hanover was commissioned by the municipality of Wennigsen to provide project and structural engineering services for the replacement structure, and a special proposal for a hybrid construction method using CPC panels was implemented. SKI was responsible for the design services for the civil engineering structure (phases 1 through 4) as well as the structural design (phases 2 through 5) and on-site construction supervision.

The new bridge features a hybrid construction using three different materials. The substructure consists of a galvanized steel frame. A total of three CPC (Carbon Prestressed Concrete) slabs are laid on top of this frame, forming the deck. The CPC slabs are high-strength concrete components reinforced with carbon fiber, which eliminates the risk of corrosion. The use of carbon fiber reinforcement also allows for a minimal concrete cover. The bridge is bordered on the sides by a 1.30-meter-high railing made of solid wood (in this case, larcah).

Following a structural analysis by SKI Ingenieurges. mbH, the abutments of the old bridges were deemed suitable for reuse. Six elastomeric bearings are now installed on the abutments, on which the new bridge structure is supported in a floating arrangement. The chosen design represents a robust and exceptionally durable construction method. Holcim, the manufacturer of the CPC slabs, estimates a service life of 100 years. Due to space constraints, all components of the new bridge structure had to be transported individually to the site and assembled there. The bridge, which is 5.00 m long and 2.10 m wide, spans the Wennigser Müllbach and connects a park to a daycare center.

Die SKI Ingenieurges. mbH möchte sich an dieser Stelle ganz herzlich bei allen Beteiligten, insbesondere der Gemeinde Wennigsen, der Fa. Holcim, der Fa. MWM und der Fa. Gumba, für die konstruktive, zielgerichtet und vertrauensvolle Zusammenarbeit bedanken. Ohne das Zusammenspiel zwischen Bauherr, Planer und Bauunternehmen wäre die reibungslose Umsetzung in der Kürze der Zeit nicht möglich gewesen. Von Beginn der Beauftragung bis zur erfolgreichen Umsetzung sind gerade einmal sechs Monate notwendig gewesen.