Connection of the Milan Metro to Linate Airport is being advanced through delivery of the latest slurry wall equipment from Liebherr.
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The first of the newly launched HS 8100 HD duty cycle crane and HSG 5-18 L grab have been delivered to contractor Saos for the new 15km long M4 line between San Cristoforo and the airport, which will have 21 stations when it opens in 2022.
In total, Saos is constructing 84,000m2 of slurry walls for the scheme.
Saos has put the new rig to use on the Piazza San Babila and has said that its productivity has improved with up to 130m2 constructed per day.
At San Babila, Saos is excavating 2.8m wide by 1.2m thick bites to 54m below ground level for redevelopment of the existing station to create an interchange.
According to Liebherr, the modular design of the new grab allows Saos to easily change the thickness of the bite from 500mm to 1,800mm. It is available in a compact or large size and Saos is using the larger version which has an additional 7t dead weight to improve excavation in difficult ground conditions. Saos has said the ground at San Babila varies from sand to gravel with layers of loam.
Verticality of the slurry walls can also be controlled accurately useinf a Jean Lutz system fitted to the grab which allows full three dimensional visibility in real time.