DRILLING METHOD TO ERECT STRIP FOUNDATION IN WATER-BEARING SOILS Russian patent published in 2011 - IPC E02D27/00 

FIELD: construction.

SUBSTANCE: drilling method to erect strip foundations in water-bearing soils includes drilling of wells, arrangement of spatial reinforcement frames in them. Along axes of foundation, at design elevations, a system of horizontal wells is drilled, and wells include two and more parallel injection wells from angular pits. Spatial reinforcement frames are arranged in wells at an interval. Distance between wells is assigned so that cylinders of fixed soils are covered. Additionally vertical walls are arranged at corners of erected foundation with their submersion into compact soils for erection of drilled piles. Horizontal and vertical wells pass under protection of "dead" inventory column of thick-walled casing pipes. On completion of drilling, corner pits are filled with soil with compaction. Injection of fixing solutions is also carried out at an interval with simultaneous withdrawal of casing pipes. Fixing compositions are selected with account of physical-mechanical properties of soils, aggressiveness of soil and anthropogenic waters. All wells are injected with one fixing composition, as wells come across soils with various physical-mechanical properties, radii of soils fixation are balanced by correction of fixing solutions viscosity, varying dosage of hardeners, or changing pressure of their injection. After removal of soils that cover foundations, cleaning and levelling their surface, installation of hydraulic insulation, walls erection is started.

EFFECT: improved efficiency of works, reduced scope of earth works and reduced material intensity of production.

2 dwg