The access ramps and TMB launching and receiving chambers are for a road tunnel under the Dead Vistula River in Gda"sk.
It will be the first road tunnel constructed in Poland using TBM technology. There will be two parallel tunnels more than 12m in diameter and almost 1.1km in length. The access ramps on the western and eastern sides of the tunnel will be about 40 m wide and 750 m and 340 m long, respectively.
Keller will build diaphragm walls along the access ramps and TBM chambers and will apply jet grouting technology to enable large diameter soilcrete columns to be installed at considerable depth.
Work is expected to start shortly and to complete in the second quarter of next year.
"Increasing our participation in large and complex projects is one of our key aims and we are delighted that the consortium building the Gdansk tunnel has chosen Keller as its partner,” said Keller chief executive Justin Atkinson. "We have extensive experience of supporting large-scale tunnelling projects around the world and are currently working on projects related to London's Crossrail development and the Rome Metro extension. Such projects enable us to take full advantage of the accumulated knowledge and experience within our global businesses."
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