US Patent 7874761 Support structure for a soft ground

The inventive support structure for a soft ground consists of at least two elements which comprise a plate [1], on the lower supporting surface of which three anchoring projections in the form of hooks are made or secured, one of these projections [9] being located near the end face [5] and two other [8, 10] being located near side faces [6, 7], and a curved anchoring element [11], the side surfaces [12] of which are inclined with respect to the horizontal surface of the plate and have three arc-like segments [13, 14, 15] projected outside the contour of the plate base.