Method of forming a modified ground in an earthen foundation

Details Method of forming a modified ground in an earthen foundation Method of forming a modified ground in an earthen foundation

1994-05-13

1996-10-01

Taylor, Dennis L.

Hydraulic and earth engineering

Foundation

Columnar structure

405232, 405269, E02D 312

Patent

active

055607390

ABSTRACT:
A modified ground for an underground water cut-off wall, landslide protection wall, or a foundation pile, etc., is formed in an earthen foundation by an excavator having at least one rotary shaft in accordance with the following method. The rotary shaft includes a bit on a lower end thereof and at least one nozzle for jetting a consolidating fluid which is disposed upwardly of the bit. The method comprises an excavating step for forming a hole in the earthen foundation and a withdrawing step of the rotary shaft from the hole. That is, in the excavating step, the rotary shaft is advanced into the earthen foundation to form therein the hole while rotating the rotary shaft without jetting the consolidating fluid from the nozzle until the hole is excavated to reach a predetermined depth. Subsequently, in the withdrawing step, the rotary shaft is withdrawn away from the bottom of the hole while rotating the rotary shaft and jetting the consolidating fluid from the nozzle against soil surrounding the hole for enlarging the diameter of the hole in such a manner as to perform an in-situ mixing and stirring of the consolidating fluid and soil. After the resulting mixture is hardened, the modified ground having a larger diameter than the hole is formed in the earthen foundation.

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