JP3147978B2 - 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 multi-shaft agitator for deep mixing, which is capable of forming a continuous wall-shaped improved 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 method, the stirrer is driven into the original ground while rotating the vertical stirring shaft provided at the tip of the stirrer,
A cement material such as cement mortar or cement milk is spouted from the tip, and the surrounding soil is mixed with the cement material while stirring, and 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 the rotation of the stirring shaft has a columnar shape. For example, as shown in FIG. 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, It does not result in 100% ground improvement, and in this state the transmission of force to the adjacent improved ground is unclear.

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 2 is formed as shown in the drawing, a part of the adjacent improved ground 1 is cut at the overlap portion.
There was a drawback that waste of compaction material and loss of construction time were 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 relates to a plurality of vertical stirring shafts each having a horizontal stirring blade on an outer peripheral portion, and a gear box disposed on the outer periphery of the tip of each vertical stirring shaft. , Projecting horizontally from each vertical stirring axis
Through each side of each gearbox
To be able to rotate while extending in the connecting direction of each vertical stirring shaft.
Received and arranged so as to sandwich the plurality of vertical stirring shafts.
Via the rotation transmission mechanism in the gearbox
A pair of water rotationally driven by rotation of each of the vertical stirring shafts
It comprises a flat stirring shaft and vertical stirring blades arranged on the outer periphery of each horizontal stirring shaft.

[0007]

According to the above arrangement, the horizontal stirring blade is rotated by the rotation of the vertical stirring shaft, and the cutting ground and the solidified material are stirred and mixed into a sectional shape corresponding to the rotation locus. At the same time, the vertical stirring blades on both sides of the tip rotate and stir both sides of the rotation trajectory into a horizontal cylinder, thereby adjusting the construction sectional shape of the improved ground to a rectangular shape.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a twin-screw agitator for deep mixing according to the present invention. This device is
A pair of vertical stirring shafts 10 having a hollow inside, and both vertical stirring shafts 10
And a support stay 12 which is supported on the outer periphery of the vertical stirring shaft 10 on both sides thereof to maintain a constant distance between the shafts, and which is below the support stay 12 and vertically penetrated by each vertical stirring shaft 10. a gear box 14 provided to the outer periphery at state, projecting horizontally from the vertical agitator shaft 10
By penetrating both sides of each gear box 14
The bearings extend in the direction in which the vertical stirring shafts are connected.
And a pair of vertical stirring shafts 10 are sandwiched therebetween.
And a pair of horizontal stirring shafts 16.

The lower end of the vertical stirring shaft 10 protruding from the gear box 14 is formed in a bit shape, and a discharge port 10a for the consolidated material is opened, from which a consolidated material such as cement milk is discharged. Excavation wings 18 are provided on the outer periphery of the vertical stirring shaft 10 in the vicinity of the discharge port 10a, and draw a cocoon-shaped trajectory A projected in the vertical direction of FIG. While cutting the ground. A plurality of pairs of stirring blades 20 are arranged on the outer periphery of the vertical stirring shaft 10 above the stay 12, and stir and mix the excavated soil and the discharged consolidated material.

As shown in FIGS. 2 and 3, the inside of the gear box 14 has a drive-side bevel gear 22 connected to the vertical stirring shaft 10 and the drive-side bevel gear 22 which is supported at the center of the side of the gear box 14. Driven bevel gear 24 meshing with bevel gear 22
And a spur gear 26 coaxial with the bevel gear 24, and meshes with the left and right sides of the spur gear 24, and
And a pair of driven spur gears 28 which are connected to the horizontal stirring shaft 16 by rotation of the vertical stirring shaft 10.
Are rotated in the same direction. A large number of plate-like vertical stirring blades 30 are arranged on the outer periphery of each horizontal stirring shaft 16, and stir in a horizontal cylindrical locus B projected in the horizontal direction of FIG. 1 with the rotation of the horizontal stirring shaft 16. .

Therefore, by this synthetic stirring action,
The shape of the improved ground obtained by a single construction overlaps with the stirring area of the cocoon-shaped cross-sectional shape by the excavating wings 18, and the portions that cannot be completely stirred on both sides are stirred and mixed by the vertical stirring blades 30. As shown in FIG. 4, it is possible to obtain the improved ground 1 having a rectangular cross section and a rectangular column shape. The improved ground 1 is formed into a wall shape without forming adjacent construction points in an overlapping state, and is integrated. It can be created.

In the embodiment, the vertical stirring blade 30 has a plate shape. However, the vertical stirring blade 30 may have a spiral shape as shown in FIG. 5 or a ribbon screw shape as shown in FIG. Of course.

[0013]

As described in detail in the above embodiments, in the stirring apparatus for deep mixing according to the present invention, the horizontal stirring blade is rotated by the rotation of the vertical stirring shaft, and the cross section corresponding to the rotation locus is rotated. Stirring into the shape, and at the same time, the vertical stirring blades on both sides of the tip rotate and stir both sides of the rotation trajectory into a horizontal cylindrical shape to adjust the construction cross-sectional shape to a rectangular shape, so that the adjacent improved ground and overlap construction It is possible to easily obtain a 100% -improved continuous wall-like improved ground without performing the method accurately, thereby preventing waste of the consolidated material and loss of construction time.

[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 front sectional view of the gearbox.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a plan sectional view of an improved ground using the stirring device.

FIG. 5A is a side view showing another embodiment of the vertical stirring blade. (B) is a side view which shows another Example of the same vertical stirring blade.

FIGS. 6 (a) and 6 (b) are plan sectional views showing a problem of a conventional improved ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical stirring shaft 14 Gear box 16 Horizontal stirring shaft 20 Horizontal stirring blade 22,24,26,28 Rotation transmission mechanism (22,24 bevel gear, 26,28 spur gear) 30 Vertical stirring blade

──────────────────────────────────────────────────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-7 JP-A-173829 (JP, A) JP-A-5-163718 (JP, A) JP-A-62-153413 (JP, A) JP-B 1-15653 (JP, B2) (58) Fields investigated (Int. . ^7, DB name) E02D 3/12 102 E02D 5/18 E02D 17/13

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 on an outer periphery of a tip of each vertical stirring shaft, and projecting horizontally from each vertical stirring shaft.
Through each side of each gearbox
To be able to rotate while extending in the connecting direction of each vertical stirring shaft.
Received and arranged so as to sandwich the plurality of vertical stirring shafts.
Via the rotation transmission mechanism in the gearbox
A pair of water rotationally driven by rotation of each of the vertical stirring shafts
A stirrer for deep mixing, comprising a flat stirring shaft and vertical stirring blades arranged on the outer periphery of each horizontal stirring shaft.