Felperbrücke – A13 Brenner motorway

Work on a European transport hub:

Renovation of Felperbrücke – A13 Brenner motorway

Felperbrücke is a girder bridge with seven sections, and a total span of 395 m. The bridge superstructure comprises two single-celled pre-stressed concrete hollow boxes.

A seamless carriageway slab joins the hollow boxes at the centre, creating a continuous supporting structure with a total width of 24.20 m.

The surface of the carriageway slab is not sealed after construction.

Job Report – Factsheet

Project: Renovation of Felperbrücke – A13 Brenner motorway / Austria
Contractor: Alpen Straßen AG (today part of ASFINAG GROUP)
Client: ARGE renovation Inn Canal
Type of operation: Partial demolition of the cantilever for the installation of an edge reinforcement beam | Removal of chloride-damaged concrete on the bridge deck | Substrate preparation for the sealing work
Special feature: Very hard concrete | Very short construction phases | Coupling of the high-pressure units

Construction measure

The renovation works were completed between March and September 2003 in three construction phases, with two-way traffic throughout on the Brenner motorway.

They posed great challenges to man & machine due to the tight and penalised interim and final deadlines.

Cantilever slab

As part of the renovation works, the extremities of the cantilever slabs were removed across a width of 35 cm in both traffic directions (whilst preserving the existing reinforcement) in order to install an edge reinforcement beam made of high-quality low-shrink reinforced concrete. The cutting had to be carried out in 70 cm subsections in order to install anchor plates for the trusses of the steel inspection gangways.

Fact: Removal of partial demolition of 100 m³ cantilever plate (25 cm thick), partial demolition of 2000 m² carriageway slab (3.5 cm thick), 10,000 m² surface preparation

Equipment technology

Due to the local aggregate, the concrete was unusually hard and very difficult to cut. Therefore, partial demolition of the cantilever with depths up to 25 cm in the shortest time required the use of several high-pressure units, which achieved coupled performance peaks of up to 750 kW.

Technical fact: Equipment technology used – standard robot and hand lance | Units - KD 412, 1000 bar, partially coupled

Carriageway slab

Extensive concrete cutting was also required in large subsections as the structural concrete was severely damaged by chloride penetration.

Finally, the entire carriageway slab was blasted with water at high-pressure to prepare the surface for the subsequent sealing works.

Result

Only by using state-of-the-art and high-performance pumps, as well as robot technology was Wannenwetsch GmbH able to meet the requirements of the client to its full satisfaction.

As part of the ARGE Felperbrücke (Riegler GmbH & Co. KG / Held & Francke Bau GmbH & Co. KG), Wannenwetsch made a considerable contribution to the successful completion of the full renovation project, which was conducted in the public eye.

Working under the highest quality criteria

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With more than 26 million passengers every year, Zurich is the number 1 airport in Switzerland. The airport is also an international player in terms of quality. Therefore, the chloride-damaged surfaces of the P6 multi-storey car park were overhauled to the highest standards, including the consistent use of certified particulate filters.

Renovation of the water-side dam wall

Maintenance of Pöhl Reservoir / Saxony

The structure required restoration due to the severely damaged concrete surface of the water-side dam wall. The remedial works for the dam wall were scheduled in two stages. Firstly, large areas of damage, weathered old concrete were removed by high-pressure water blasting. Secondly, a 20 cm-thick shotcrete facing formwork was constructed.

Work on the North Sea bed

Renovation of the Limfjord Tunnel, Denmark

The Limfjord tunnel is a key link to the Aalborg region. Water penetrated the twin-tube undersea motorway tunnel due to leaky construction joints. The purpose of the renovation was to stop the water penetration and to reconstruct the damaged concrete.

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