JP3312350B2 - Deep mixing treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates is intended to relate to Deep Mixing construction method of the ground soil and soil treatment agent by mixing and stirring performs processing deep soil with stirring blades protruding from the lower end of the rotary shaft is there.

[0002]

2. Description of the Related Art In a deep mixing method, a rotary shaft is excavated.
Rotation of rotating shaft to ensure verticality when moving (penetrating)
It is conventionally known to intermittently rotate forward and reverse directions.
(See Japanese Patent Application Laid-Open No. 60-188521).
Change the inclination of the rotation direction of the stirring blade when making it like a known example
Otherwise, the agitating blades are more likely to bite into the ground during normal rotation
However, it becomes worse at the time of reverse rotation, and the penetration ability of the rotating shaft
May decrease.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention is to solve
The problem to be solved (object of the present invention) is
Underground of the rotating shaft without lowering the penetration capacity of the rotating shaft
Deep mixing treatment that can ensure verticality during penetration
Is to provide a law.

[0004]

Means for Solving the Problems] To solve the above problems
The deep mixing treatment method of the present invention (hereinafter referred to as the method of the present invention
), The underground of a rotating shaft with a stirring blade protruding at the lower end
At the time of insertion, change the rotation direction of the rotating shaft for each penetration depth as appropriate
Together, to match the change in the rotational direction of the rotary shaft, before
The inclination of the rotation direction of the agitating blade does not bite into the ground.
So that it does not change .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a case where ground treatment is performed by a two-shaft type deep mixing apparatus, in which 1 is a construction machine main body, 2 is a rotary blade, and 3 is a stirring blade. As shown, the two rotating shafts 2 are suspended from the construction machine main body 1 so as to be able to move up and down integrally, and the stirring blades 3 are provided at the lower ends of the rotating shafts 2 so as to project radially.

The arrow A indicates the direction of rotation of the rotating shaft 2 during normal rotation,
The mark B indicates the direction of rotation at the time of reverse rotation.
Indicates the rotation direction of the rotating shafts 2 and 2 at the time of penetration,
Alternately, like arrow A-arrow B-arrow A-arrow B
And rotate the rotating shafts 2 and 2 vertically to a predetermined depth.
To be included.

By the way, in the conventional deep mixing apparatus,
Slender plate-shaped stirring blade 3 penetrates well into the ground during forward rotation
So that the upper edge is in the rotation direction (clockwise in FIG. 3)
The lower edge is tilted forward and fixed to the rotating shaft 2
But the inclination of the stirring blade 3 is constant
Repeat the forward and reverse rotation as described above while holding
When the rotating shaft 2 penetrates by rotating the rotating shaft 2
The agitating blades 3 are less likely to penetrate the ground, and have a greater penetration capacity.
The width will be reduced.

Therefore, in the method of the present invention, the above-described rotary shaft
2, the rotation direction of the stirring blade 3
Change the slope so that it does not hinder the penetration into the ground,
The stirrer blade 3 always penetrates into the ground, and the penetration efficiency is high.
I try not to lower it .

FIG . 4 shows an apparatus suitable for the method of the present invention.
There is an explanatory diagram of an example of this.
Part is rotatably attached to the lower end of the rotating shaft 2 and is attached
It is rotated by the rotation mechanism 4 and its inclination in the rotation direction is set to 360 degrees.
It can be changed in the range of ° .

The illustrated rotating mechanism 4 is a hydraulic cylinder.
A rotating shaft 7 at a base end of the stirring blade 3 by a rack 6 operated at 5;
This is a method of rotating the gear 8 attached to the
The rotation angle of the stirring blade 3 is detected by the stroke of the hydraulic cylinder 5.
It can be easily detected by laying means .

[Brief description of the drawings]

FIG. 1 is a plan view for explaining a case where ground treatment is performed by a two-axis type deep mixing apparatus.

FIG. 2 is an explanatory view of an embodiment of the method of the present invention.

FIG. 3 illustrates the relationship between the rotation direction of the rotating shaft and the inclination of the stirring blade.
It is a side view for clarification .

FIG. 4 is an explanatory view of an example of an apparatus for implementing the method of the present invention.

[Explanation of symbols]

1: Construction machine main body, 2: rotating shaft, 3: stirring blade, 4: rotating mechanism, 5: hydraulic cylinder, 6: rack, 7: rotating shaft, 8:
gear.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-188521 (JP, A) JP-A-5-287728 (JP, A) JP-A-6-41943 (JP, A) JP-A-6-41943 193042 (JP, A) JP-A-3-33317 (JP, A) JP-A-59-8824 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 3/12 102

Claims (1)

(57) [Claims] When the rotating shaft having a stirring blade protruding from a lower end portion penetrates into the ground, the rotating direction of the rotating shaft is appropriately changed for each penetration depth, and in accordance with the change in the rotating direction of the rotating shaft,
The inclination of the rotation direction of the agitating blade makes it difficult to cut into the ground.
A deep mixing method, characterized in that it is changed so that it does not become inconsistent.