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Contract awarded for the start of construction of the Riederwald Tunnel in Frankfurt

On 18 June 2025, Autobahn GmbH des Bundes awarded the contract for the first construction phase of the new Riederwald Tunnel in Frankfurt am Main to a bidding consortium consisting of Wayss & Freytag Ingenieurbau AG, Bickhardt Bau SE and Implenia Civil Engineering GmbH.

The Riederwald Tunnel is Autobahn GmbH's largest inner-city construction project in Hesse. It is the centrepiece of the closure of the gap between the A66 and the Frankfurt A661 eastern bypass. The planned route is 2.2 kilometres long and comprises both above-ground and underground sections. Around 1.1 kilometres run as a tunnel under the Riederwald district. With the planned completion of the gap closure by 2033, an efficient connection between the eastern environs and the city of Frankfurt will be established and the traffic density in the Riederwald district will be significantly reduced.

The contract for the first construction phase (VE 4.1.1) comprises the first trough and tunnel sections east of the Erlenbruch motorway junction. The tunnel is being constructed using the cut-and-cover method under the protection of a watertight excavation pit enclosure. The tunnel structure consists of a closed ‘two-cell’ reinforced concrete frame with staggered tunnel portals in each direction of travel. A filter is installed between the excavation shoring and the structure and below the base of the structure to prevent groundwater flow in the final tunnel.

Foto: © Die Autobahn GmbH, www.tunnelriederwald.de

 

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