JPH086312B2 - Ground improvement machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement machine for improving the ground by stirring and mixing it with powder of solidifying material or milk.

[0002]

2. Description of the Related Art Generally, ground improvement machines are used to form a foundation ground such as a ground surface. The ground improvement machine is configured by axially supporting a rotary shaft between a pair of support arms vertically descending into the ground, and projecting a plurality of stirring blades on the outer peripheral surface of the rotary shaft. Then, the supporting arm is lowered while spraying the powder of the solidifying material or the milk on the ground surface, and the ground is agitated and mixed for improvement.

[0003]

However, in this ground improvement machine, particularly when the construction is performed by spraying the powder of the solidifying material on the ground surface, a large amount of dust is generated and scattered around, which causes a pollution problem. Was awake. In addition, since it is sprayed on the ground surface, there is a limit to the depth, and at most 1.0-1.
There was a problem that construction could only be done up to about 5 m.

Therefore, the applicant has formed a ground in which the rotary shaft is formed in a hollow shape and a plurality of discharge ports are formed on the outer peripheral surface of the rotary shaft to communicate with the hollow interior and discharge the powder of solidifying material or milk. When inventing the improved machine, if there are multiple discharge ports due to the pressure, the discharge amount from each discharge port is not always constant, so it is sufficient to uniformly discharge the solidifying material powder or milk into the ground. could not. Therefore, the present invention has been made to solve the above-mentioned problems, and eliminates pollution caused by spraying on the ground surface, and a ground improvement machine capable of uniformly spraying powder or milk of a solidifying material into the ground. The purpose is to provide.

[0005]

In order to achieve such an object, the present invention has a rotating shaft horizontally supported between a pair of supporting arms descending into the ground, and a plurality of stirring blades on the outer peripheral surface of the rotating shaft. In the ground improvement machine in which the rotary shaft is projected and the ground is agitated and mixed while rotating the rotary shaft, the rotary shaft is formed in a hollow shape, and the rotary shaft is communicated with the hollow inside substantially in the center thereof. A discharge port for discharging the powder of solidifying material or milk is provided, and a discharge gutter whose both end surfaces are open is integrally provided along the longitudinal direction of the outer peripheral surface of the rotating shaft. It is provided so as to surround the front of the container and incline downward to both sides around the discharge port, so that the solidifying material powder or milk discharged from the discharge port is evenly spread to both sides by the discharge gutter. is there.

[0006]

With the rotation of the rotary shaft, the powder or milk of the solidifying material discharged from the discharge port is received by the upper surface of the discharge gutter and is diffused to both sides along the discharge gutter. Moreover, since the discharge gutter surrounds the front of the discharge port in the rotational direction, the discharge port is not blocked by soil and the discharge amount is not reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ground improvement machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a mixing apparatus which is a main part of the ground improvement machine, and FIG. 2 is a sectional view thereof. Although not shown, the mixing apparatus is attached to the tip of the ground improvement machine. In the figure, 1 and 1 are a pair of support arms vertically descending into the ground, and shaft holes 2 and 2 are provided at lower end portions on both sides thereof.
Has been established. Reference numeral 3 is a rotary shaft that is horizontally arranged between the support arms 1 and 1 and is rotatably supported by the shaft holes 2 and 2. Reference numeral 4 denotes a drive motor which is provided outside one of the support arms 1 and rotationally drives the rotary shaft 3.

The rotary shaft 3 has a plurality of stirring blades 5, 5 ... Arranged in line on the outer peripheral surface thereof, and a hollow interior 6 is formed inside. Reference numeral 7 is a discharge port that is opened substantially in the center of the rotary shaft 3 and communicates with the tip of the hollow interior 6. The base end of the hollow portion 6 is cement attached to one end of the rotary shaft 3,
It is connected to a rotary swivel 8 for supplying powder of solidifying material such as lime or milk. Reference numeral 9 is a supply pipe connected to the rotary swivel 8.

However, 10 is a discharge gutter which is integrally provided along the longitudinal direction of the outer peripheral surface of the rotary shaft 3 and whose both end surfaces are open. As shown in FIG. 3, the discharge gutter 10 surrounds the front of the discharge port 7 in the rotational direction, and has a side surface U which is inclined downward toward both sides around a central portion 11 corresponding to the discharge port 7.
It is formed in a letter shape. The central portion 11 corresponding to the ejection port 7 is formed in a mountain shape whose ridge line is orthogonal to the central axis of the rotary shaft 3 and is located at the center of the ejection port 7.

The ground improvement machine of the present invention is constructed as described above, and while driving the drive motor 4 to rotate the rotary shaft 3, the support arms 1 and 1 are vertically lowered into the ground to stir and mix the ground. At this time, the solidifying material powder or milk supplied from the rotary swivel 8 to the hollow interior 6 is discharged from the discharge port 7 as shown in FIG.
It is divided into left and right with 1. Then, it is evenly diffused to both sides along the side plates 12 of the discharge gutter 10 and mixed with the soil. In addition, since the discharge gutter 10 is formed so as to surround the front of the discharge port 7 in the rotational direction, the discharge port 7 is not blocked by soil and the discharge amount is not reduced, and the solidified material powder or Good milk discharge. Although the central portion 11 is provided in a mountain shape, it is not limited to this shape and may be, for example, a hemispherical shape.

[0011]

As described above, according to the ground improvement machine of the present invention, the rotary shaft is formed in a hollow shape, and the powder of the solidifying material is communicated with the hollow inside at substantially the center of the rotary shaft. Alternatively, a discharge port for discharging milk is provided, and a discharge gutter whose both end surfaces are open is integrally provided along the longitudinal direction of the outer peripheral surface of the rotating shaft, and the discharge gutter surrounds the front side in the rotation direction of the discharge port. Since it is installed so as to incline to both sides around the discharge port, there is no pollution such as when spraying cement powder on the ground surface, and in the ground there is no solidification material powder or milk and soil. It can be mixed uniformly and the ground can be improved homogeneously.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a ground improvement machine of the present invention.

FIG. 2 is a front sectional view of the same.

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

FIG. 4 is an enlarged front view showing the same action.

[Explanation of symbols]

 1,1 Support arm 3 Rotating shaft 5,5 Stirring blade 6 Hollow interior 10 Discharge gutter

Claims (1)

[Claims] 1. A ground shaft is horizontally supported between a pair of support arms descending into the ground, and a plurality of agitating blades are projectingly provided on an outer peripheral surface of the ground shaft while rotating the ground shaft. In the ground improvement machine configured to stir and mix, the rotary shaft is formed in a hollow shape, and a discharge port that communicates with the hollow interior and discharges the powder or milk of the solidifying material is provided in substantially the center of the rotary shaft. In addition, a discharge gutter whose both end faces are open is integrally provided along the longitudinal direction of the outer peripheral surface of the rotating shaft, and the discharge gutter surrounds the front of the discharge port in the rotational direction and descends to both sides around the discharge port. A ground improvement machine, which is provided so as to be inclined so that powder of solidifying material or milk discharged from a discharge port can be evenly spread to both sides by a discharge gutter.