JP2884453B2 - Ground improvement equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal stirring blade attached to the lowermost end of a rotating shaft and driven to rotate in the horizontal direction, and a vertical stirring device attached to the rotating shaft just above the horizontal stirring blade. The present invention relates to a ground improvement device in which a plurality of stirring mechanisms each having a vertical stirring blade that is rotationally driven are connected in parallel to each other.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 4 and 5, as a method of improving a soft ground, a ground improvement device 1 having a rotatable vertical stirring blade is used to inject hardened material and remove soil from the ground. There has been proposed a method of forming an improved ground W by mixing with stirring.

[0003] As shown in FIG.
The agitator includes a horizontal stirring blade 2 inserted substantially vertically into the ground T and rotating in the horizontal direction, and a vertical stirring blade 3 attached to the upper portion of the horizontal stirring blade 2 and rotating in the vertical direction. The mechanism 4 is configured by connecting two units. In addition, a driving device 5 for rotating and driving the horizontal stirring blades 2 and the vertical stirring blades 3 is provided at an upper portion of the ground improvement device 1, and a driving device 5 is provided between the horizontal stirring blades 2 and the vertical stirring blades 3. Is provided with a long drive shaft 4 so that its driving force is transmitted.

As shown in FIG. 4 and FIG. 5, the vertical stirring blades 3 adjacent to each other on the left and right sides are vertically separated from each other so that their stirring ranges are substantially overlapped in a plan view and the blades do not contact each other. In addition, they rotate in opposite directions. The vertical stirring blades 3 all have the same radius of rotation, and are installed in pairs mounted on the same stirring mechanism 4 with their rotation axes on the same axis.

The ground improvement apparatus 1 rotates the horizontal stirring blades 2 and the vertical stirring blades 3 in a state where the whole stirring mechanism 4 is moved downward to be inserted into the ground T, thereby rotating the ground T , An improved ground W having a rectangular shape in plan view is formed.

[0006]

However, in the case of the above-mentioned ground improvement apparatus 1, the following problems have occurred. That is, the ground improvement device 1 forms the improved ground W having a rectangular shape in plan view by overlapping the stirring ranges of both the horizontal stirring blade 2 and the vertical stirring blade 3, as shown in FIGS. 6 and 7. When the improved ground W is continuously provided in a curved manner, such as a continuous guide wall or an underground beam, the ends of the improved ground W are wrapped, and the work is wasted.

[0007] The improved ground W is wrapped around the improved ground W.
If it is attempted to form the ground, the agitation resistance of the improved ground W and a portion other than the improved ground W will be different, and the ground improvement device 1 will be eccentric due to the difference in the agitation resistance, and the operation of the agitating mechanism 4 will become unstable, thus improving There is a concern that the accuracy of the method will decrease. When the difference between the resistances is large, the installation position of the ground improvement device 1 may be changed, or the formation position of the improved ground W and the overlapping portion of the improved ground W or the ground T may be changed.
It is necessary to carry out the treatment after increasing or decreasing the stirring resistance on each of the portions where the improved ground W is to be formed, thereby causing a decrease in work efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a case where the improved ground W is curved and connected continuously by forming a trapezoidal improved ground W having a different improved length before and after the apparatus. It is an object of the present invention to provide a ground improvement device in which the work efficiency of the ground improvement is improved.

[0009]

In the ground improvement apparatus of the present invention, a first vertical stirring blade is mounted on one side of the rotating shaft in the longitudinal direction of the device, and the first vertical stirring blade is mounted on the other side of the rotating shaft. Means for solving the above-mentioned problem is to configure by attaching a second vertical stirring blade having a larger rotation radius.

[0010]

According to the ground improvement apparatus of the present invention, two horizontal improved grounds whose nearest parts are wrapped by the horizontal stirring blade are formed. Next, the first vertical stirring blade and the second vertical stirring blade agitate the improved ground formed by the horizontal stirring blades and the surrounding ground by further inserting the device into the deep part of the ground. Each of the first vertical stirring blades and the second vertical stirring blades forms the improved ground having a trapezoidal shape in a plan view by stirring the ground into a shape substantially equal to itself. The improved ground formed by each of the first vertical stirring blades and the second vertical stirring blades is an end on the side where the improved grounds formed by the first vertical stirring blades and the second vertical stirring blades are adjacent to each other. As a result of the portions wrapping, they combine to form a continuous elongated trapezoidal improved ground. Then, the ground improvement apparatus combines the improved ground formed by the horizontal stirring blades with the first and second vertical stirring blades to form an improved ground having a trapezoidal shape in plan view substantially equal to its external shape in plan view.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Reference numeral 10 in the figure denotes a ground improvement device of the present embodiment. The ground improvement device 10 is provided with first and second vertical stirring blades 11 and 12 in the figure instead of the vertical stirring blade 3 of the ground improvement device 1. In addition,
In the drawings, the same components as those in FIGS. 4 to 7 are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 1 to FIG. 3 and FIG. 4, the ground improvement device 10 is provided between the horizontal stirring blade 2 and the driving device 5 at each position of the vertical stirring blade 3 in each of the stirring mechanisms 4. The first vertical stirring blade 11 and the second vertical stirring blade 12 are attached via a gear box 13 interposed therebetween. The gear box 13 is attached with a vertical difference between the left and right sides in the same manner as the ground improvement device 1. A first vertical stirring blade 11 is attached to each gear box 13 on the front side (downward in FIG. 1) in the front-rear direction of the apparatus, and a first vertical stirring blade 11 is provided on the rear side opposite to the first vertical stirring blade 11.
A second vertical stirring blade 12 having a larger turning radius than the vertical stirring blade 11 is attached. Each first vertical stirring blade 11
And a pair of second vertical stirring blades 12 are
Are mounted on the same axis.

The first vertical stirring blade 11 and the second vertical stirring blade 12 each have a shape in which four cutters 15 protrude radially, and the driving force is transmitted about the rotary shaft 14 to rotate the same. It is configured to be. The left and right second vertical stirring blades 12 are connected to the rotating shafts 14 and 1.
The distance between them is smaller than the sum of their radii, and they are mounted at positions where their agitating parts come into contact in plan view. The left and right first vertical stirring blades 11, 11 are configured such that the stirring portions thereof at least substantially contact each other in plan view. FIG.
As shown in FIG. 1, the first vertical stirring blade 11 and the second vertical stirring blade 12 are respectively located in the front side in the thickness direction in the side view (left side in the figure).
They are formed so as to have a small diameter, and are attached such that their side end surfaces are substantially located on the same plane. The first vertical stirring blade 11 and the second vertical stirring blade 12 are each detachable, and are formed to have a diameter such that their rotation ranges do not come into contact with each other when attached to the ground improvement device 10 during operation.

The distance between the stirring mechanisms 4 and 4 is such that the improved ground W formed by the first vertical stirring blades 11 and 11 is substantially in contact in plan view. Further, by avoiding contact by synchronizing the rotation, the distance between each pair of the first vertical stirring blades 11 and 11 and the second vertical stirring blades 12 and 12 can be reduced, or the first vertical stirring blades 11 and 11 can be reduced. A larger diameter may be used for the 11 and the second vertical stirring blades 12.

The operation of this embodiment will be described below. When the ground improvement device 10 is operated and inserted into the ground T, first, the horizontal agitating blades 2 form two improved grounds W1 whose closest parts are wrapped to each other as shown in FIG. Then, the ground improvement device 10 further inserts the ground T around the first improved ground W1 formed by the horizontal stirring blades 2 into the first vertical stirring blades 11 and the second vertical The stirring blade 12 stirs.

As shown in FIG. 1, each first vertical stirring blade 1
The first and second vertical stirring blades 12 respectively form the second improved grounds W2 and W3 having a trapezoidal shape in plan view by stirring the ground T into a shape substantially equal to itself. Second improved ground W
2. W3 is the first vertical stirring blade 1 located below.
Firstly formed by the first or second vertical stirring blades 12, and then formed by the first vertical stirring blades 11 or the second vertical stirring blades 12 located above by increasing the insertion depth of the soil improvement device 10. You. Since the pair of the first vertical stirring blades 11, 11 and the second vertical stirring blades 12, 12 are mounted at positions where the stirring portions of the vertical stirring blades contact each other in plan view, the second improved ground formed in advance. W2 and W3 are
With the insertion of the ground improvement device 10, the first
Of the second improved ground W2, W3 formed by the vertical agitating blade 11 or the second vertical agitating blade 12 are wrapped or substantially in contact with each other. As a result, the second improved ground W2 and W3 are combined with each other to form a continuous elongated thin trapezoidal third improved ground W4.

Then, the ground improvement device 10 combines the first improved ground W1 and the third improved ground W4 formed by being inserted toward the deep part of the ground T, and as a result, as shown in FIG. The left and right ends of the front edge of the first vertical stirring blade 11 and the second
And a trapezoidal improved ground W, which is enclosed by connecting the left and right ends of the rear end edge of the vertical stirring blade 12 of FIG.

Therefore, the ground improvement device 10 of the present embodiment
According to the horizontal stirring blade 2, the first vertical stirring blade 11 and the second
Since the improved ground W having a trapezoidal shape in a plan view is formed by the vertical stirring blades 12 of FIG. As shown in FIG. 7, the improved ground W can be continuously connected to the ground with a constant radius of curvature without a wrap portion. Since the stirring resistance always acts on the device 10 on average, the operation of each stirring blade is stabilized, and the forming position of the improved ground W is stabilized, thereby improving the accuracy of the construction.

[0019]

As described above, according to the ground improvement apparatus of the present invention, the first rotating shaft is provided on one side in the longitudinal direction of the apparatus.
, And a second vertical stirring blade having a larger radius of rotation than the first vertical stirring blade is mounted on the other side of the rotating shaft. As a result of forming an improved ground having a trapezoidal shape in plan view by using the vertical stirring blades and the second vertical stirring blades, and inserting the ground improvement device into the ground so as to be continuous in the length direction, the improved ground is continuously installed. The ground can be connected continuously with a constant radius of curvature without the wrap portion, and the work efficiency is improved by eliminating waste of operation of the device, and the stirring resistance always acts on the ground improvement device on average. An excellent effect of stabilizing the operation of each stirring blade and improving the construction accuracy of the improvement is achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is the front view.

FIG. 3 is the side view.

FIG. 4 is an overall view showing a conventional example.

FIG. 5 is the plan view.

FIG. 6 is a view showing one form of continuous installation of improved ground.

FIG. 7 is a diagram showing the other example.

[Explanation of symbols]

 Reference Signs List 10 ground improvement device 11 first vertical stirring blade 12 second vertical stirring blade W improved ground W1 first improved ground W2 second improved ground W3 second improved ground W4 third improved ground

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takuro Odawara Shimizu Construction Co., Ltd. 1-3-2 Shibaura, Minato-ku, Tokyo (56) References JP-A-4-247116 (JP, A) JP-A Sho 62-153413 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 3/12 102

Claims (1)

(57) [Claims] 1. A horizontal stirring blade attached to the lowermost end of a rotating shaft and driven to rotate in the horizontal direction, and a vertical stirring device attached to the rotating shaft and driven to rotate in the vertical direction just above the horizontal stirring blade. A ground improvement apparatus comprising a plurality of stirring mechanisms provided in parallel with each other and provided with stirring blades, wherein a first vertical stirring blade is attached to one side in the front-rear direction of each of the rotating shafts, and the other side of the rotating shaft is provided. And a second vertical stirring blade having a larger radius of rotation than the first vertical stirring blade.