JPH06313313A - Rectangular agitating mechanism - Google Patents

Abstract

PURPOSE:To provide the rectangular agitating mechanism of a foundation ground improving device which does not leave a nonimproved area and is excellent in working efficiency. CONSTITUTION:A rod 107 being rotatable round a vertical axis is provided with an agitating blade 3 and an agitating head 5, and moreover a bevel gear 13. Bevel gears 15a, 15b engaging with the bevel gear 13 are severally provided with cutters 11a, 11b through supporting parts 9a, 9b. When the rod 107 rotates round a vertical axis, the agitating blade 3 and the agitating head 5 also rotate round the vertical axis to carry out excavation and agitation. In addition, the cutters 11a, 11b rotate round a horizontal axis to carry out the excavation and the agitation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement apparatus for excavating a ground into a rectangular shape and injecting cement slurry into loosened soil to improve the ground.

[0002]

2. Description of the Related Art A conventional ground improvement device is shown in FIG. In FIG. 7, 101 is a work machine, 1
03 is the ground, 105 is a vertical reader, 1
Reference numeral 07 is a rod supported by the reader 105 and rotatable about a vertical axis, 109 is a drive unit equipped with a motor for rotating the rod 107, and 111 is a stirring blade provided at the tip of the rod 107.

The ground improvement work by such a ground improvement device is performed as follows. When the driving device 109 is driven and the weight of the driving device 109 is applied while rotating the rod 107 about the vertical axis, the stirring blade 111 rotates,
The ground is excavated and penetrates. While excavating the ground with the stirring blade 111, the cement slurry is injected into the ground from the tip of the hollow rod 107.
The earth and sand excavated and loosened is stirred by the stirring blade 111. When excavation and intrusion progress to a predetermined depth, the drive device 1
09 is reversed and the driving device 1 is operated by the winch of the work machine 101.
The rod 107 is wound up, and the rod 107 is pulled out while being reversed and stirred. After that, the slurry is solidified and the ground is improved.

[0004]

When the ground is improved by such a ground improving apparatus, a cylindrical ground improving portion is formed in the ground, and as shown in FIG. 8, the cylindrical ground improving portion E is used.
The unimproved part F is left in between. In order to reduce the unimproved part F, as shown in FIG. 9, it is possible to excavate so as to overlap the ground improvement part E to improve the ground.
Work efficiency is extremely poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rectangular stirring mechanism for a ground improvement apparatus, which has no unimproved portion and has good working efficiency. .

[0006]

In order to achieve the above-mentioned object, the present invention is to improve the ground by excavating the ground and injecting cement slurry into the excavated and loosened earth and sand to stir the soil. In the apparatus, a rod that is rotatable about a vertical axis, a motor that rotates the rod around the vertical axis, and a first excavator that is provided on the rod and that rotates together with the rod around the vertical axis for excavation and stirring.・
A second excavator for excavating and stirring by rotating around a horizontal axis according to rotation of the stirring means and the rod around the vertical axis.
A rectangular stirring mechanism comprising: stirring means.

[0007]

In the present invention, since the second excavation / stirring means rotates around the horizontal axis to perform excavation / stirring, the excavation is performed in a rectangular shape, and the unimproved portion can be almost eliminated.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the ground improvement device of the present invention, the mechanism shown in FIG. 1 is provided in the section D of the ground improvement device shown in FIG.

That is, the rod 107 is provided with a plurality of stirring blades 3 which rotate about the vertical axis, and the rod 107 is also provided.
A plurality of stirring heads 5 that rotate around the vertical axis at the tip of the
Is provided. A casing 7 is provided between the stirring blade 3 and the stirring head 5, and a supporting portion 9 is provided on a side portion of the casing 7.
a and 9b are provided, and the support portions 9a and 9b are provided with cutters 11a and 11b which rotate about a horizontal axis.

FIG. 2 is a perspective view of the casing 7, and FIG.
FIG. 3 is a sectional view taken along line HH of FIG. A passage 19 is provided inside the rod 107, and the cement slurry is conveyed in the passage 19 and discharged from the tip or side of the rod 107 into the ground. A bevel gear (bevel gear) 13 is fixed to the rod 107. The casing 7 is stationary even if the rod 107 rotates, and the casing 17 is provided with shafts 17a and 17b rotatably.
Bevel gear 15 that meshes with bevel gear 13 on a and 17b
a and 15b are provided. Supports 9 are attached to the shafts 17a and 17b.
a, 9b are provided, and the cutters 11 are provided on the support portions 9a, 9b.
a and 11b are provided.

When the motor in the drive unit 109 is driven, the rod 107 rotates about the vertical axis, and the stirring blade 3 and the stirring head 5 rotate about the vertical axis. When the rod 107 rotates, the bevel gear 13 also rotates,
As the bevel gear 13 rotates, the bevel gears 15 a, 1
5b also rotates about the horizontal axis, and the cutters 11a and 11b rotate about the horizontal axis.

That is, the stirring blade 3 and the stirring head 5 rotate around the vertical axis to excavate and stir the ground, and the cutter 11
A and 11b excavate and agitate the ground while rotating around a horizontal axis. During the excavation operation, cement slurry supplied from the outside is discharged into the excavated soil from the tip or side of the rod 107 through the passage 19. And stirring blade 3,
The stirring is performed by the stirring head 5 and the cutters 11a and 11b. When excavation proceeds to a predetermined depth, the motor is rotated in reverse and the rod 107 is pulled out.

FIG. 4 is a plan view showing the outline of the excavated portion of the ground in this embodiment. A indicates a portion to be excavated by the stirring blade 3 and the stirring head 5. Ba and Bb indicate the portions to be excavated by the cutters 11a and 11b, respectively. As shown in FIG. 4, in this embodiment, excavation can be performed in a substantially rectangular shape.

FIG. 5 is a plan view showing the outline of the excavated portion of the ground when the ground improvement apparatus continuously improves the ground. After excavating as shown in FIG. 4, the rod 1
After extracting and moving 07, the next excavation is performed to excavate the excavation parts A1, Ba1, Bb1. As described above, in this embodiment, since the excavated portion Ba and the excavated portion Bb1 can be overlapped with each other, the ground can be improved with almost no unmodified portion left. In addition, work efficiency does not decrease. By adjusting the width of the cutters 11a and 11b,
The width of the excavated portions Ba, Bb, Ba1, Bb1 ... Can be set appropriately.

In the above-described embodiment, the bevel gears 13 and 15 are used.
Although the cutters 11a and 11b are rotated about the horizontal axis by using a and 15b, the cutters 11a and 11b can be rotated about the horizontal axis by using a worm and a worm wheel.

FIG. 6 is a schematic plan view of the main part of the ground improvement apparatus at this time. A worm wheel 21 is provided around the rod 107. A worm 25 is provided at the center of the shaft 23, and cutters 11a and 11b are provided at the ends of the shaft 23. When the rod 107 rotates about the vertical axis, the worm wheel 21 and the worm 25 rotate the shaft 23.
Rotates about a horizontal axis, and the cutters 11a and 11b rotate about a horizontal axis.

In addition to the worm wheel 21 and the worm 25, a mechanism for converting the rotation of the rod 107 about the vertical axis into the rotation about the horizontal axis is provided, and the cutter 11 is provided.
You may rotate a and 11b.

In this embodiment, one rod 107 is used for excavation and stirring. However, a plurality of rods are arranged side by side, and a mechanism as shown in FIG. 1 is provided at the tip of each rod for excavation and stirring. It is also possible to perform ground improvement.
Further, if the casing 7 has a rugby ball shape, it is possible to more smoothly penetrate into the ground and pull out from the ground.

The present apparatus can be used not only for ground improvement but also for constructing underground continuous walls and the like.

[0020]

As described above in detail, according to the present invention, it is possible to provide a rectangular stirring mechanism for a ground improvement apparatus which has no unimproved portion and which has good working efficiency.

[Brief description of drawings]

[Figure 1] Front view of the excavation and agitation unit

FIG. 2 is a perspective view of a casing 7.

FIG. 3 is a sectional view taken along line HH of FIG.

FIG. 4 is a plan view of an excavated portion of the ground according to this embodiment.

FIG. 5 is a plan view of an excavated portion of the ground according to this embodiment.

FIG. 6 is a schematic configuration diagram of a main part of another embodiment of the present invention.

FIG. 7 is a diagram showing an outline of a ground improvement device.

FIG. 8 is a plan view showing a ground improvement part by a conventional ground improvement device.

FIG. 9 is an explanatory diagram of a case where the excavation portion is overlapped to improve the ground.

[Explanation of symbols]

 3 ... Stirring blade 5 ... Stirring head 7 ... Casing 11a, 11b ... Cutter 13, 15a, 15b ... Bevel gear 21 ... Worm wheel 25 ... Worm 107 ... Rod 109 ... Drive device

Claims (3)

[Claims] 1. A ground improvement apparatus for excavating the ground with a stirring head, injecting cement slurry into loosened sand and stirring it to improve the ground, and a rod rotatable about a vertical axis and the rod being vertical. A motor that rotates about an axis, a first excavation / agitation unit that is provided on the rod and that rotates together with the rod about a vertical axis for excavation / agitation, and a horizontal unit that rotates in response to rotation of the rod about the vertical axis A second agitation and agitation unit that rotates around an axis to perform an agitation and agitation, and a rectangular agitation mechanism. 2. The rectangular stirring mechanism according to claim 1, wherein the second excavation / stirring means is connected to the rod through a bevel gear. 3. A worm wheel is provided on the rod, and the second excavating and stirring means is connected to the rod via a worm that meshes with the worm wheel. Rectangular stirring mechanism.