JPH11140861A - Stirring head for improving ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mixing between a hardening material and blocks of soil further so as to form a high strength column without uneveness by providing a horizontal wing rotating reversely to a main shaft by means of a vertical rotation wing. SOLUTION: When a main shaft 2 rotates clockwise, an excavation wing 3 and a horizontal rotation wing 5 rotates in the same direction, then ground or soil is excavated gradually by a vane board 11 and an excavation edge 12 and a tip of a turn prevention shaft 4 is made to penetrate an excavation hole forming wall A, thereby the tip of the shaft 4 is prevented from turning. According to the rotation of the horizontal rotation wing 5 a vertical rotation wing 6 rotates counterclockwise around the shaft 4, and a horizontal reverse rotation wing 7 rotates reversely thereto around the main shaft 2. A hardening material is charged into from a lower end of the main shaft 2 via a hollow part of a rod and a charging way 10 of the main shaft 2. Blocks of soil and the hardening material excavated are stirred and mixed by the rod 16 of the wing 5, the rod 18 of the wing 6, the rod 20 and a wing board 21 of the wing 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement stirring head applied to a ground improvement machine or the like.

[0002]

2. Description of the Related Art Conventionally, as this kind of ground improvement stirring head, for example, the one shown in FIG. 5 is known. The ground improvement stirring head 50 basically includes a main shaft 51.
A digging wing 52 provided at the tip of the main shaft 51;
A detent shaft 53 rotatably provided at 1 and protruding into the excavation hole forming wall; a horizontal rotary wing 54 provided on the main shaft 51;
A vertical rotating blade 55 rotatably provided on the detent shaft 53 and rotated by a horizontal rotating blade 54.
Thus, when the main shaft is rotated, the excavator blade and the horizontal rotor are rotated together with the main shaft around the main shaft, and the vertical rotor is stopped by the rotation of the horizontal rotor. Rotated around an axis.

[0003]

However, such an apparatus has a vertical rotating blade which is rotated vertically with respect to a cutting blade which is horizontally rotated and excavated. However, although it was possible to form a column having a high strength with relatively no unevenness by stirring and mixing three-dimensionally, it was still insufficient. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in order to solve the problem. It is an object of the present invention to provide a ground improvement stirring head capable of forming pillars.

[0004]

The ground improvement stirring head of the present invention is basically composed of a main shaft, a digging wing provided at the tip of the main shaft, and a digging hole formed rotatably on the main shaft. A detent shaft protruding into a wall, a horizontal rotary blade provided on the main shaft, a vertical rotary blade rotatably provided on the detent shaft and rotated by the horizontal rotary blade, and rotatably provided on the main shaft. And a horizontal counter-rotating blade that is rotated in a direction opposite to the main axis by a vertical rotating blade.

When the main shaft is rotated, the excavating wing and the horizontal rotary wing are rotated together with the main shaft around the main shaft. When the excavation wing is rotated, the ground is gradually excavated, and the detent shaft is stopped by the tip of the detent shaft protruding into the excavation hole forming wall. When the horizontal rotor is rotated, the vertical rotor is rotated about the detent axis, and the horizontal counter rotor is rotated about the main axis in the opposite direction by the vertical rotor. . The earth mass excavated by the excavation wing and the injected hardened material are agitated and mixed by the horizontal rotor, the vertical rotor, and the horizontal counter-rotor. In particular, the horizontal counter-rotating wing rotated in the direction opposite to the horizontally excavated wing further improves the stirring and mixing action of the hardening material and the earth mass.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a ground improvement stirring head of the present invention. FIG. 2 is a side view of FIG. 1. FIG.
2 is a plan view of FIG. FIG. 4 is a bottom view of FIG.

The main part of the ground improvement stirring head 1 is composed of a main shaft 2, an excavating blade 3, a stop shaft 4, a horizontal rotary blade 5, a vertical rotary blade 6, and a horizontal reverse rotary blade 7.

The main shaft 2 forms a basic part of the ground improvement stirring head 1. Although not illustrated in this example, a hollow shaft which is supported rotatably about a vertical axis and rotated clockwise is used. A hexagonal locking portion 8 detachably fitted in a locking hole of the rod and a locking recess 9 in which a locking pin is engaged. In addition, an injection path 10 for a hardening material (cement milk) is formed in the center of the rod.

The excavating wing 3 is provided at the front end of the main shaft 2.
It is composed of a plurality (two) of blade plates 11 attached to each (0 °) and a plurality of (two in total, four in each case) digging blades 12 attached to these. The blade plate 11 is provided to be inclined so as to raise the excavated soil.

The detent shaft 4 is rotatably provided on the main shaft 2 and protrudes into the excavation hole forming wall A. In this example, the detent shaft 4 is provided between the detent portion 8 of the main shaft 2 and the excavating wing 3. 2 (in the middle of the main shaft 2), a boss 13 rotatably provided around it (around the vertical axis), and a boss 13 horizontally attached to the boss 13 at equal angles (180 °) so that the tip is sharpened and excavated. It consists of a plurality (two) of rods 14 protruding into the hole forming wall A.

The horizontal rotary wing 5 is provided on the support shaft 2. In this example, the main shaft 2 between the detent portion 8 of the main shaft 2 and the detent shaft 4 (from the detent shaft 4 of the main shaft 2). It is composed of a cylindrical portion 15 formed on the (upper side) and a plurality (six) of rods 16 provided horizontally at equal angles (60 °).

The vertical rotary wing 6 is rotatably provided on the detent shaft 4 and is rotated by the horizontal rotary wing 5. In this example, a boss 17 rotatably provided on the detent shaft 4 is provided. And a plurality (six) of rods 18 which are provided at equal angles (60 °) along the vertical plane and mesh with the rods 16 of the horizontal rotary wing 5.

The horizontal counter-rotating blade 7 is rotatably provided on the main shaft 2 and is rotated in a direction opposite to the main shaft 2 by a vertical rotary blade 6. In this example, the detent shaft 4 and the excavating blade 3 are provided. And a boss 19 rotatably provided around the main shaft 2 (around the vertical axis) between the main shaft 2 and a horizontal equiangular angle (60 °) above the main shaft 2.
A plurality (six) of rods 20 attached to each and engaged with the rods 18 of the vertical rotor 6, and a plurality (two) of rods attached to the lower part of the boss 19 horizontally at equal angles (180 °). And a wing plate 21. The blade 21 is provided to be inclined so as to raise the excavated soil.

The horizontal rotary blade 5, the vertical rotary blade 6, and the horizontal reverse rotary blade 7 (except for the blade plate 21) form a so-called rod gear whose teeth have a rod shape.

Next, the operation will be described based on such a configuration. When the main shaft 2 is rotated clockwise in FIG. 3, the excavating wing 3 and the horizontal rotary wing 5 are rotated around the main shaft 2 in the same direction. When the excavation wing 3 is rotated, the ground is gradually excavated by the blade plate 11 and the excavation blade 12, and the tip of the detent shaft 4 is pushed into the excavation hole forming wall A, so that the detent shaft 4 is rotated. It is stopped. When the horizontal rotating blade 5 is rotated, the vertical rotating blade 6 is rotated counterclockwise in FIG. 2 around the rotation stop shaft 4, and the horizontal rotating blade 7 is rotated by the vertical rotating blade 6. Is rotated around the main shaft 2 in the opposite direction (counterclockwise in FIG. 3). The hardening material is injected from the lower end of the main shaft 2 through the hollow portion of the rod and the injection path 10 of the main shaft 2. The earth mass excavated by the excavation blade 3 and the injected hardened material are stirred by the rod 16 of the horizontal rotor 5, the rod 18 of the vertical rotor 6, the rod 20 of the horizontal counter-rotor 7, and the blade 21. Mixed. In particular, the blade 21 of the horizontal counter-rotating blade 7 rotated in the direction opposite to the horizontal direction of the excavating blade 3 further enhances the stirring and mixing action of the hardening material and the earth mass.

In the above example, the excavating wings 3 and the horizontal counter-rotating wings 7 each have two blade plates 11 and 21. However, the present invention is not limited to this, and other numbers may be used. In the above example, the number of the rotation preventing shafts 4 is two, but the number is not limited thereto. For example, another number may be used. In the above example, the horizontal rotor 5, the vertical rotor 6, and the horizontal counter-rotor 7
6,18,20 each had six, but not limited to this,
For example, other numbers may be used.

[0017]

As described above, according to the present invention, as described above,
The following excellent effects can be obtained. (1) Consists of a main shaft, excavating wing, detent shaft, horizontal rotating blade, vertical rotating blade, and horizontal counter rotating blade. In particular, a horizontal counter rotating blade that is rotated in a direction opposite to the main shaft by the vertical rotating blade is provided. Therefore, it is possible to further improve the stirring and mixing of the hardening material and the earthen lump, and to form a column having high strength without unevenness. (2) Since the horizontal counter-rotating wing is rotated by the vertical rotary wing, a dedicated rotation driving means for rotating the horizontal counter-rotating wing is not required, the structure is simplified, the cost can be reduced, and it is extremely reasonable. It is a target.

[Brief description of the drawings]

FIG. 1 is a front view showing a ground improvement stirring head of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a bottom view of FIG. 1;

FIG. 5 is a perspective view showing a conventional ground improvement stirring head.

[Explanation of symbols]

1,50: stirring head for ground improvement, 2,51: spindle,
3, 52: excavating wing, 4, 53: anti-rotation axis, 5, 54: horizontal rotating wing, 6, 55: vertical rotating wing, 7: horizontal counter rotating wing, 8
... Detent part, 9 ... Retaining recess, 10 ... Injection path, 11,21 ...
Blade plate, 12: excavating blade, 13, 17, 19: boss, 1
4, 16, 18, 20: rod, 15: cylindrical portion, A: excavation hole forming wall.

Claims (1)

[Claims] 1. A spindle, a drilling wing provided at a tip of the spindle, a detent shaft rotatably provided on the spindle and protruding into an excavation hole forming wall, and a horizontal rotary wing provided on the spindle. A vertical rotor that is rotatably provided on the rotation stop shaft and is rotated by a horizontal rotor, and a horizontal counterrotor that is rotatably provided on the main shaft and is rotated in a direction opposite to the main shaft by a vertical rotor. And a stirring head for improving the ground.