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US 10,941,343 B2Granted
Foaming additive for soil conditioning in the presence of mechanised excavation for tunnel construction
AssigneeMapei S.P.A.
InventorsMassimo Stefanoni, Carlo Pistolesi, Marco Squinzi, Enrico Dal Negro, Cristiano Maltese, Daniele Peila
Life of this patent
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Abstract
Disclosed is a liquid foaming additive for use in mechanised excavation by a tunnel boring machine, containing 5-40% by weight of one or more surfactants, 0.01-5% by weight of one or more biopolymers, and 55-94.99% by weight of water.
Claims2
Method of conditioning excavated soil with a liquid foaming additive containing 5-40% by weight of one or more surfactants, 0.01-5% by weight of one or more biopolymers and 55-94.99% by weight of water, said method comprising:
- adding said liquid foaming additive to an excavation chamber of a tunnel boring machine, and
- conditioning said excavated soil.
Dependencies are inferred from the claim text.