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US 4,567,708 AGranted
Method for levelling sunken or broken portions of earth-supported floors and slabs
OwnerVeikko Haekkineninventor
Life of this patent
Estimating the term…
Abstract
The method relates to levelling sunken or broken portions of earth-supported floors or slabs (2, 2A). At least one hole (1) is made in the floor, and polyurethane foam is sprayed between the floor and the underlying earth through this hole. The foam creates in the space a mould pressure, which raises the floor.
Claims7
An improved method for levelling sunken or broken portions of earth-supported floors and slabs, comprising the steps of:
- mixing components to form an expandable polymeric foam mixture;
- and
- injecting the unexpanded mixture of said components beneath a sunken or broken portion of an earth-supported floor or slab, whereby the expansion of said foam between said portion and the earth creates a mould pressure which raises said portion toward a position level with the remainder of said floor or slab.
Dependencies are inferred from the claim text.