METHOD TO MAINTAIN INITIAL STRESSED-DEFORMED CONDITION OF SOIL IN ZONE OF EXISTING BUILDING FOUNDATION Russian patent published in 2011 - IPC E02D31/08 

FIELD: construction.

SUBSTANCE: method to erect underground structures in an area of city development includes arrangement of a geotechnical barrier in soil between foundations of the existing building and an erected underground structure with its closing for a rated depth, erection of walls and a bottom of the underground structure. At the same time the geotechnical barrier is arranged at a rated distance from the foundation of the existing building in the form of a row of vertical drilled-injection piles with a pitch, at the same time each of them is arranged in the following manner: a conductor is installed into a previously drilled process well, filled with a cement solution with subsequent time delay until full gain of the cement solution strength. Then the formed cement stone is drilled inside the conductor, and the process well is additionally drilled to the rated depth, and then a special well monitor is lowered with side nozzles, and a washing cement solution is supplied to the monitor along a flexible sleeve, and this solution, outgoing from the side nozzles of the monitor in the form of a high-speed jet, washes the specified rated volume of soil, forming a washed cavity (a cavern), filled with a soil-cement mixture. Afterwards the well monitor is extracted from the process well, a packer is installed in its place, and simultaneously, near the process well, there are vertical collar injectors installed, so that holes of injectors are arranged in the washed cavity (the cavern), and the controlled injection of the cement solution is carried out.

EFFECT: maintaining initial stressed-deformed condition of soil in the zone of the existing building foundation.

2 cl, 1 dwg