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Pump up the volume


TUNNELLING ON a section of Germany's new high-speed rail link from Nuremberg to Munich required a large number of Putzmeister pumps to deliver concrete to multiple sites simultaneously.

The 171km line is designed for speeds up to 300kmh and will cut the journey from 102 minutes to 64.

The 89km section from Nuremberg south to Ingolstadt will mostly run parallel to the A9 motorway. But at Los Mitte, just north of Ingolstadt, 15.6km of tunnels are required.

ARGE Tunnel Los Mitte, a joint venture of Hochtief and Alpinebau, is building the Irlahull (7,260m), the Schellenberg (650m) and the Eulerwang (7,700m) tunnels.

The tunnels will carry twin tracks and have cross sections of about 140m 2, with emergency exits every 1km. These are being excavated through often Karstic ground using drill and blast and in places are only 10m below ground level.

Tunnel linings comprise 250-350mm thick shotcrete outer shell with steel mesh and a 350mm to 500mm thick cast insitu concrete lining, cast in 12m sections. Up to 10 Putzmeister BSA 1408 E concrete pumps are shifting the 650,000m 3concrete needed.

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