Excavator and a method of forming a modified ground in an earthe

Hydraulic and earth engineering – Foundation – Columnar structure

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405237, 405269, E02D 312

Patent

active

055035019

ABSTRACT:
A modified ground, for example, an underground water cut-off wall, landslide protection wall, or the like, is formed in an earthen foundation with the use of an excavator having at least one rotary shaft. The rotary shaft comprises a bit provided at a bottom end thereof, a stirrer having an expandable stirring wing disposed upwardly of the bit, and at least one nozzle for jetting a consolidating fluid in a downwardly diagonal direction. The stirring wing is capable of selectively taking an expanded form and a reduced form to vary an outside diameter of the stirrer about the axis of the rotary shaft. The nozzle is disposed upwardly of the stirrer such that the consolidating fluid jetted from the nozzle collides with the stirring wing in the expanded form. In the present method, the rotary shaft is inserted at a predetermined depth in the earthen foundation to form a hole therein while keeping the stirring wing in the reduced form without jetting the consolidating fluid from the nozzle. Subsequently, the rotary shaft is withdrawn away from the hole while rotating the rotary shaft, keeping the stirring wing in the expanded form, and jetting the consolidating fluid from the nozzle against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.

REFERENCES:
patent: 4433943 (1984-02-01), Pao Chen
patent: 4624606 (1986-11-01), Nakanishi et al.
patent: 4786212 (1988-11-01), Bauer et al.
patent: 4906142 (1990-03-01), Taki et al.
patent: 5256004 (1993-10-01), Gemmi et al.
patent: 5399056 (1995-03-01), Shibazaki et al.
patent: 5411353 (1995-05-01), Taki

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