FORMATION OF HARDENED STRATUM OF GROUND

摘要

PURPOSE:To prevent the displacement of surrounding ground by a method in which the screw of an injecting rod is penetrated to a given depth while discharging soil and raised while injecting a hardener from the nozzle of the rod in such a way as to allow the pressure of injection to escape to the core space deprived of its soil. CONSTITUTION:A driver 8 is turned and the screw 2 of an injecting rod 1 is turned to form a core portion (a) by discharging the excavated soil. During the period, the rod 1 is penetrated to a given depth and raised while injecting a hardener under high pressures from the nozzle 3 of the rod 1 in such a way as to mix the hardener with the surrounding soil. The injecting pressures of the hardener are allowed to escape to the core space (a) during the period of injection, and a hardened layer A is formed.