METHOD OF CONSTRUCTION OF UNDERGROUND STRUCTURE Russian patent published in 1995 - IPC

FIELD: construction. SUBSTANCE: prior to erection of walls of the under- ground structure, a zone of loose ground is formed to the depth of the structure to be constructed. A supporting prism from a sand-gravel mix is set up along the structure outline. After erection a sheet-piling is pressed in the ground mass on the day surface of the structure walls between them and existing buildings, using the erected structure walls as supporting constructions for pressing-in. Then a curtain of clay mortar is set up between the structure to be constructed and sheet-piling. Then dipping of the structure walls is started with simultaneous even destruction of the supporting prism from the sand-gravel mix. EFFECT: prevention of ground migration from under foundations of existing buildings at construction in restricted urban conditions. 3 cl, 6 dwg