Description
Class E02D : FOUNDATIONS; EXCAVATIONS; EMBANKMENTS
Subclass 3/115: Improving or preserving soil or rock, e.g. preserving permafrost soil (securing of slopes or inclines E02D 17/2; damming or interrupting passage of underground water E02D 19/12; improving soil for agricultural purposes A01; soil stabilisation for road building or like purposes E01C 21/00, E01C 23/1; setting rock anchoring bolts E21D) by thermal, electrical or electro-chemical means (freezing soil for interrupting passage of underground water E02D 19/14) by freezing