Skip to content

A100 Lot 6 of the 16th construction stage, Berlin

Facts and Figures
Company PORR GmbH & Co. KGaA, Stump-Franki Spezialtiefbau GmbH
Principal Autobahn GmbH of the German Federal Government, Northeast branch
Location Berlin - Germany
Type Structural engineering
Runtime 05.2021 - 12.2024

PORR is building Lot 6 of the 16th construction stage of the Berlin city motorway

Following its work on Lot 5, PORR's Civil Engineering branch in Berlin has now been awarded the contract for Lot 6 of the 16th construction stage of the A100 Berlin city motorway. Together with Stump-Franki Berlin, it is creating the road trough and a new S-Bahn bridge over a 255m stretch.

Better connections for the eastern city districts

The A100 takes a semicircular route southwest through the districts of Mitte, Charlottenburg-Wilmersdorf and Tempelhof-Schöneberg to Neukölln district. The 3,170m-long 16th construction stage, which starts at the Neukölln motorway junction and is expected to end at the Treptower Park junction by 2024, will provide the eastern districts with better connections to the city ring road, the A113 and Berlin-Brandenburg Airport. Traffic experts are hoping that this will greatly relieve through-traffic in the southeastern part of the inner city. Low-level construction is one of the most important measures for reducing noise pollution. Due to the high groundwater levels in Berlin and difficult soil conditions, however, it also requires special civil engineering expertise. In other words, it’s a case for PORR’s expert teams, whose specialist knowledge spans the entire supply chain in construction.

A demanding civil engineering project

For the 16th construction stage, the civil engineering work on tunnels, troughs and bridges was divided into seven lots. As with lot 5, PORR is also working with the team from its subsidiary Stump-Franki Spezialtiefbau GmbH, which specialises in sophisticated civil engineering, on the trough construction for the 225m-long Lot 6 section, the Ringbahn railway overpass.

Trough construction with an underwater concrete base

The actual engineering is difficult in its own right, but setting up the construction site and excavating and removing more than 80,000m3 of earth have also proven extremely challenging, due to the inner-city location with densely packed buildings and high levels of traffic.

As the trough blocks are below the groundwater level in several areas, the excavation pits have to be made watertight with a horizontal underwater concrete base. Lateral protection and bracing are provided by 9,800mm3 of diaphragm walls at up to 1.40m thick and 30m tall, plus 7,100m of tiebacks and 10,300m of tension piles.