METHOD TO CONSTRUCT MULTISTOREY UNDERGROUND STRUCTURES UNDER COMPLICATED ENGINEERING-GEOLOGICAL CONDITIONS Russian patent published in 2011 - IPC E02D29/45 

FIELD: construction.

SUBSTANCE: method to construct multistorey underground structures in weak water-saturated soils in districts of existing development, including arrangement of vertical walls, arrangement of floor ceilings and subsequent removal of soil from the foundation pit, differing by the fact that position of vertical walls is reliably fixed in their lower part with a concrete diaphragm laid at the bottom of the foundation pit without extraction of soil; in the upper part the vertical walls are fixed with spreader beams laid onto soil foundation at the elevation of upper ceiling of the structure along the external contour of the foundation pit, and a frame installed along the external contour of the foundation pit onto soil foundation also at the elevation of the upper ceiling; spreader beams, in their turn, are supported with a system of horizontal longitudinal and transverse beams, which are mounted at the level of the ceiling, afterwards the soil mass is removed from the foundation pit to the elevation of the ceiling of the lower floor; at the level of the lower floor the similar technological operations are carried out to arrange spreader beams and a system of longitudinal and transverse beams that support spreader beams; afterwards the soil mass is removed to the level of the ceiling of the next floor below, and all technological operations are repeated; finally the soil mass is removed from the foundation pit to the diaphragm that closes the foundation pit bottom, afterwards the diaphragm surface is levelled, and ceilings are assembled, in the "bottom-up" order.

EFFECT: invention provides for higher reliability of all elements of a structure and a facility as a whole.

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