METHOD AND DEVICE FOR GROUND IMPROVEMENT

PROBLEM TO BE SOLVED: To perform a soft ground improvement while properly preventing the occurrence of a horizontal displacement of a ground as necessary. SOLUTION: A ground surface displacement near an excavated position caused by an excavation by an excavating shaft (a) or by raising and soil discharging of the excavating shaft and the underground displacement and pressure in those places must not be produced are observed in real time using those pressure sensors such as an earth pressure gauge and a hydraulic pressure gauge and by displacement measurement means. When a rise of pressure or an occurrence or increase of displacement is observed, the pressure must be lowered or the displacement must be eliminated by controlling the amount of discharged soil by the excavating shaft (a) or discharged stabilizer and controlling the intrusion and excavating speed or pulling-up speed of the excavating shaft (a).