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| Storm and security panels |
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| Shooting range |
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| Aseismic system |
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| Dental chair attachment |
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| Method of controlling positions and vibrations and active vibration control apparatus therefor |
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| Plastic window assembly |
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| Electrically induced radon barriers |
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| Soil liquefaction prevention by electro-osmosis during an earthquake event |
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| Shower apparatus |
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Excavator and a method of forming a modified ground in an earthen foundation with the use of the same
| Details |
Inventors: Kunito, Mitsuhiro;
Assignee: Kabushiki Kaisha Ask Kenkyusho (Osaka, JP)
Primary Examiner: Ricci; John A.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton
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 Subsequently, the rotary shaft is withdrawn away from the hole while rotating the rotary shaft, keeping the stirring wing in the expanded form, and jetting the consolidating fluid from the nozzle against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. |
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DETAILED DESCRIPTION For improving the above problems, the present invention is directed to an improved excavator, and a method of forming a modified ground pillar or wall in an earthen foundation with the use of the excavator.
The excavator has at least one rotary shaft which includes a bit provided at a working or bottom end thereof, a stirrer having at least one 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 therefrom collides with the stirring wing in the expanded form.
The modified ground pillar can be formed uniformly with the use of the excavator according to the following method.
The rotary shaft is inserted at a predetermined depth in the earthen foundation to form therein a hole 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 bottom of the hole while rotating the rotary shaft, keeping the stirring wing in the expanded form, and jetting the consolidating fluid from the nozzles against soil surrounding the hole to break the same 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.
As a result, the modified ground pillar having a larger diameter than the hole can be formed uniformly in the earthen foundation.
In the withdrawing step of the present invention, even when the consolidating fluid jetted from the nozzles is intercepted by an obstacle such as a hard clod of earth prior to colliding with the stirring wings in the expanded form, so that a small amount of soil which is not broken by the consolidating fluid remains around the hole 50 in the earthen foundation, it is possible to break the remains of soil with the stirring wings 61 in the expanded form
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Vibration and Earthquake Isolation 
