JP2721613B2 - Stirrer for deep mixing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer for deep mixing, which is capable of forming a continuous improved wall-like ground by making the construction sectional shape rectangular.

[0002]

2. Description of the Related Art As a method of improving soft ground, there is a deep mixing treatment method. In this processing method, the stirrer is driven into the original ground while rotating the vertical stirrer shaft provided at the tip of the stirrer, and cement material such as cement mortar and cement milk is spouted from the tip to stir the surrounding soil. While mixing with the consolidation material, the ground is improved by consolidation.

[0003]

The stirring shaft is of a uniaxial type or a biaxial type, and has a flow passage for a consolidated material formed therein.
And it has many stirring blades on the outer circumference. Therefore, the improved ground obtained by rotation of the stirring shaft has a columnar shape. For example, as shown in FIG. 4 (a), the improved ground 1 obtained by using the twin-screw stirring device A large number of cylinders having a cocoon-shaped cross-section are formed vertically and horizontally adjacent to each other, and a substantially diamond-shaped gap d formed between the improved grounds 1 remains as the original ground E. , 100%
In this state, the transmission of force to the adjacent improved ground 1 is unclear.

[0004] In order to solve this problem, FIG.
As shown in (1), there is also a method of constructing in a state where adjacent improved grounds 1 overlap each other. However, according to this overlap construction method, although a continuous wall-shaped improved ground 1 is formed as shown in the drawing, a part of the adjacent improved ground 1 is cut at the overlap portion, and thus the consolidated material is formed. There is a drawback that waste of time and loss of construction time are large.

The present invention solves the above problems,
The purpose is to be able to construct the improved ground in a rectangular cross section, thereby making it possible to perform 100% ground improvement without overlapping construction with the adjacent improved ground, and to easily form a continuously improved wall-shaped ground. An object of the present invention is to provide a stirrer for deep mixing treatment which can be formed.

[0006]

In order to achieve the above object, the present invention provides a plurality of vertical stirring shafts each having a horizontal stirring blade on an outer peripheral portion, arranged at the tip of each stirring shaft, and connected to each other. A gear box, a pair of rotating shafts that are rotatably supported in the oblique directions on both sides of each gear box, and are rotationally driven by the rotation of the vertical stirring shafts via a rotation transmission mechanism, and disposed at the tip of each rotating shaft. Provided with a rotary cutter.

[0007]

According to the above construction, the rotary shaft, which is supported obliquely, rotates in accordance with the rotation of the vertical stirring shaft, and the rotary cutter which rotates on the inclined surface cuts both ends of the stirring shaft into a wedge shape. With this cutting shape, the sectional shape of the improved ground formed into a column shape by the stirring blade is adjusted to a rectangular shape.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a twin-screw agitator for deep mixing according to the present invention. This device is
A pair of vertical stirring shafts 10 provided with a plurality of horizontal stirring blades 12 on the outer periphery, and a pair of vertical stirring shafts 10 at the distal ends, both sides of which are supported by the outer periphery of the vertical stirring shaft 10 to maintain a constant distance between the shafts. A support stay 14, which is located below the support stay 14, and which bears the tip of each vertical stirring shaft 10, and
gearbox 1 having a wedge-shaped cross-section connected to each other via a
6, a pair of rotating shafts 18 which penetrate through the inclined side portions of each gear box 16 and are vertically supported on the inclined side portions, respectively. A disk-shaped rotary cutter 20 arranged diagonally on both sides;
No. 0 has a plurality of drill bits 20a provided at the tip of the disk.

As shown in FIG. 2, the inside of the gear box 16 has a drive bevel gear 22 axially connected to the tip of the vertical stirring shaft 10, and is disposed on both sides thereof. And the driven bevel gear 24 that rotates on an inclined surface. The bevel gear 24 is axially connected to each of the rotating shafts 18. Note that the inside of the vertical stirring shaft 10 is hollow, and a discharge port 16b is opened at the bottom of the gear box 16 so that the solidified material supplied to the inside of the vertical stirring shaft 10 can be discharged to the outside through the discharge port 16b. Discharged.

Therefore, by the rotation of the vertical stirring shaft 10,
The stirring blade 12 rotates in the horizontal direction, and stirs the original ground along a cocoon-shaped locus indicated by the arrow A direction. Further, the rotating shaft 18 rotates with the rotation of the vertical stirring shaft 10, and the above-described stirring shaft 1 is rotated by a cutter bit 20 a of a rotary cutter 20 at the tip thereof.
The original ground E is cut into a wedge shape on the obliquely inclined surface on both sides in the axial direction of 0, drawing a locus indicated by an arrow B. Due to this excavation action, the shape of the improved ground 1 obtained by one operation has a substantially rectangular cross section as shown in FIG. 3, and the improved ground 1 having a prismatic shape is obtained by the stirring action of the stirring blade 12. Become. Therefore, by repeating this operation, it is possible to form an improved ground in an integrated state by forming a wall shape without constructing adjacent construction sites in an overlapping state as shown in the figure.

[0011]

As described in detail in the above embodiments, in the stirring apparatus for deep mixing according to the present invention, the rotating shaft rotates in accordance with the rotation of the vertical stirring shaft, and the rotary cutter rotates the stirring shaft. In order to cut both ends into a wedge shape,
The cross-sectional shape of the improved ground can be adjusted to a rectangular shape according to the excavated shape, and a continuous wall-shaped improved ground 100% improved with high accuracy can be easily formed without performing overlap construction.

[Brief description of the drawings]

FIG. 1 is a perspective view of a twin-screw agitator according to the present invention.

FIG. 2 is a sectional view of a gearbox.

FIG. 3 is a sectional view of an improved ground using the stirring and mixing device.

4 (a) and 4 (b) are cross-sectional views showing problems of the conventional improved ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical stirring shaft 12 Horizontal stirring blade 16 Gear box 18 Rotation shaft 20 Rotary cutter 22, 24 Rotation transmission mechanism (bevel gear)

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Atsuo Fukuda 2-4-1 Akasaka, Minato-ku, Tokyo Inside Tenox Co., Ltd. (56) References JP-A-4-247116 (JP, A) JP-A-5 -163718 (JP, A) JP-A-7-173829 (JP, A) JP-B 1-15653 (JP, B2)

Claims (1)

(57) [Claims] 1. A plurality of vertical stirring shafts each having a horizontal stirring blade on an outer peripheral portion, a gear box disposed at the tip of each stirring shaft and connected to each other, and rotatable in both sides of each gear box in a diagonal direction. Deep mixing comprising: a pair of rotating shafts that are bearings and are rotationally driven by the rotation of the respective vertical stirring shafts via a rotation transmitting mechanism; and a rotary cutter disposed at a tip of each of the rotating shafts. Stirrer for processing.