JP3621971B2 - Drilling and mixing equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is a ground improvement work for civil engineering work, in which soil and filler are mechanically mixed and consolidated, and when a large number of improvement pillars are constructed in the ground, the mixing and mixing of cutting soil is performed efficiently. The present invention relates to a drilling and stirring mixing device.
[0002]
[Prior art]
A conventional excavating and agitating apparatus includes a predetermined excavating blade 2 on an excavating shaft 1 and an upper portion of the excavating blade 2 as shown in Japanese Patent Publication No. 58-29374 shown in FIGS. A plurality of stirrer blades 3 having substantially the same diameter are fixed vertically in a plurality of stages, and the excavation shaft 1 is disposed between the excavation blades 2 and the agitation blades 3 of the excavation shaft 1 and between the agitation blades 3 separated by the plurality of agitation blades 3. The co-rotation prevention device 4 having a diameter Db larger than the excavation diameter Da was inserted in a freely rotatable state.
As shown in the figure, the co-rotation prevention device 4 is formed by fixing two co-rotation prevention blades 6 to a sleeve-like boss 5 fitted to the excavation shaft 1. Even if the excavation shaft 1 rotates, the diameter has a diameter Db larger than the excavation diameter Da, so that it does not rotate and is propelled into the soil.
In addition, the rings 7a and 7b are formed on the excavation shaft 1 so as to be positioned above and below the boss 5, so that the co-rotation prevention blade 6 does not move up and down.
The excavation and agitation mixing device 4 has a stronger improved column because the agitation and mixing of the filler and the soil is better than the device without the co-rotation prevention blades used so far.
[0003]
Therefore, after being stimulated by the invention, a comb-shaped stirring blade as shown in FIG. 4, a forward and reverse stirring blade as shown in FIGS. 5A to 5C, and an underground mixer as shown in FIG. Mold stirring blades have been manufactured and implemented.
Both are composed of an inner tube 10a and an outer tube 10b in which excavation blades and stirring blades are arranged, and the outer tube 10b is fixed on the ground and only the inner tube 10a is rotated to feed, or the outer tube 10b and the inner tube are driven. The pipe 10a is rotated in the opposite direction and fed, and a filler such as cement milk is ejected from the discharge port 11 (FIG. 4) at the lower end so that the soil and the filler are mixed and stirred to form a cylindrical shape. The improvement pillar was formed.
[0004]
[Problems to be solved by the invention]
However, in the conventional excavation stirring and mixing apparatus shown in FIGS. 2 and 3, since the common rotation prevention blade 6 is rotatably inserted to the excavation shaft 1, large diameter gravel and rolling stones are prevented from rotating together. Even if it is narrowed between 6 and the excavating blade 2 or the stirring blade 3, the co-rotation preventing blade 6 can be rotated to prevent the excavating blade 2 and the stirring blade 3 from being damaged, and the drive motor from being stopped or damaged. However, since the second co-rotation preventing blade 6 from the tip is installed across the plurality of stirring blades 3 and 3, there is a drawback that the degree of stirring and mixing near the second co-rotation preventing blade 6 is poor. It was.
[0005]
Moreover, the conventional excavation stirring and mixing apparatus shown in FIGS. 4 to 6 is forced to reversely rotate when there is a large-diameter gravel or a boulder that disturbs stirring and mixing in the ground to be ground improved. If such a large-diameter gravel or boulder narrows between the excavating blade 12 and the agitating blade 13, troubles such as breakage of the agitating blade 13 and the excavating blade 12, stoppage or damage of the drive motor occur. It was.
Furthermore, since fine earth and sand enter between the inner tube 10a and the outer tube 10b and the resistance increases, rotation becomes impossible. Therefore, it is necessary to carefully perform the construction up to a deep depth.
[0006]
This invention is made | formed in view of the situation mentioned above, eliminates the conventional fault, and provides the excavation stirring mixing apparatus with favorable excavation and stirring mixing.
[0007]
[Means for Solving the Problems]
The excavation and agitation mixing apparatus of the present invention excavates and pulls out an excavation shaft having a excavation blade at the tip and a plurality of stirrer blades disposed above by a predetermined excavation mechanism, and fills with soil and soil. In the ground improvement machine for mixing and stirring materials, a co-rotation prevention blade having a diameter larger than the diameter of the excavation blade and rotatably inserted to the excavation shaft via a boss is connected to the excavation blade 1 together are arranged at two locations between the between the stirring blade stage and the stirring blade and the second-stage stirring blades, and the co-rotation preventing blade, the gap between the drilling blade and stirring blades at about 20cm characterized in that there.
[0008]
Moreover, the clearance gap between the said rotation prevention blade | wing of an excavation stirring mixing apparatus of this invention, a drilling blade, and a stirring blade is 30 cm or less, It is characterized by the above-mentioned.
[0009]
[Action]
Since the anti-rotation blades are arranged above and below one stirring blade, stirring and mixing can be performed efficiently.
[0010]
In addition, since the clearance between the co-rotation prevention blade and the excavation blade and the stirring blade is set to about 20 cm , large gravel, boulders, etc. do not bite into the gap, so troubles such as overloading the drive motor. Does not occur. Even if it is caught, the co-rotation prevention wing is pivotally attached to the drilling shaft via the boss, so the co-rotation prevention wing rotates and has the effect of passing over large diameter gravel. Occurrence can be prevented.
[0011]
【Example】
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a front view showing an embodiment of the present invention.
In the figure, reference numeral 21 denotes an excavation shaft, to which an excavation blade 22 is attached at the tip, and a discharge port 21a for a filler is opened near the tip. Reference numeral 23 denotes a stirring blade having an outer diameter substantially the same as that of the excavating blade 22, and a plurality of stages are arranged above the excavating blade 22.
The co-rotation prevention blade 26 is rotatable between the excavation blade 22 and the first stage stirring blade 23 above the excavation blade 22 and between the stirring blade 23 and the second stage stirring blade 23 via bosses 25 respectively. It is attached and is configured not to move in the vertical direction by the upper and lower rings 27a and 27b.
The co-rotation prevention blade 26 is formed to have a larger diameter than the excavation blade 22 and the stirring blade 23.
[0012]
And the clearance gap between the co-rotation prevention blade | wing 26 and the excavation blade | wing 22 and the stirring blade 23 is about 20 cm.
[0013]
The case where ground improvement is performed using the excavation stirring and mixing apparatus equipped with the above-described co-rotation preventing blade 26 will be described.
First, excavating and agitating and mixing apparatus is attached to the tip of a rod (not shown), rotated by a motor of a ground improvement machine (not shown), and discharged into the ground while discharging filler such as cement milk from the discharge port 21a at the tip. A drilling diameter corresponding to the outer diameter of the wing 22 is formed, and the co-rotation prevention wing 26 having a diameter larger than the digging diameter bites into the surrounding ground, so that it does not rotate relatively and the excavation of the digging shaft 21 proceeds. As a result, it is pushed into the soil.
Therefore, although the earth lump excavated by the excavation blade 22 at the tip of the excavation shaft 21 rotates together with the excavation blade 22, the rotation of the earth clump is stopped by the common rotation prevention blade 26, and crushed by the rotating excavation blade 22. Next, it is stirred and mixed with the filler by the stirring blade 23 above it, and then further finely crushed between the second-stage co-rotation prevention blade 26 and subsequently the filler by the subsequent stirring blade 23. And mixed with stirring.
[0014]
FIG. 7 (a) shows a conventional excavation / stirring / mixing device in which a common rotation prevention blade separates a plurality of stirring blades, and FIG. 7 (b) shows the excavation / stirring mixing device of the present invention. It is arranged with a single stirring blade.
And (a), (b) of FIG. 8 is a case where the improvement pillar is constructed on the ground with the conventional apparatus shown in (a) of FIG. 7 and the apparatus of the present invention shown in (b) of FIG. a graph showing the uniaxial compressive strength measured for each depth (compressive strength in the axial direction _{only) q u (kgf / cm 2} ), open circles and the values of the conventional apparatus, a black circle indicates the value by the apparatus of the present invention.
As shown, the strength of the device of the present invention is clearly higher than that of the conventional device. In particular, the improvement effect at a deep position is remarkable.
[0015]
【The invention's effect】
According to the present invention described in detail above, the following effects can be obtained.
(1) In the conventional apparatus, since the two co-rotation preventing blades are arranged with a plurality of stirrer blades spaced apart, the degree of stirring and mixing between them is small, which is a weak point in quality. In the present invention, the installation interval of two co-rotation prevention blades having a diameter larger than the diameter of the excavation blade is reduced, and only one stage of the stirring blade exists between them. However, it improves substantially uniformly over the entire length of the ground improvement range, and therefore the strength also increases.
[0016]
(2) When the clearance between the co-rotation prevention blade and the excavation blade or the stirring blade is large, the degree of stirring and mixing decreases, and when the thickness is about 20 cm , the mixing and mixing of the filler and the soil are performed well.
In addition, since the clearance between the co-rotation prevention blade and the excavation blade and the stirring blade is set to about 20 cm, troubles such as overloading the drive motor because large-diameter gravel or boulders do not bite into the gap. Does not occur.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view at the time of construction by a conventional excavation stirring and mixing apparatus.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a front view of a conventional excavating and agitating and mixing apparatus using a comb-type agitating blade with a double pipe.
FIG. 5 is a front view of a conventional excavating stirring and mixing apparatus using forward and reverse stirring blades using a double pipe.
FIG. 6 is a front view of a conventional excavating and agitating mixing apparatus using an underground mixer type agitating blade with a double pipe.
FIGS. 7A and 7B are front views comparing a conventional excavating and agitating and mixing apparatus according to the present invention, in which FIG.
FIG. 8 is a graph of a place where an improved column is constructed on the ground with the conventional apparatus shown in FIG. 7 (a) and the apparatus of the present invention shown in FIG. 7 (b), (a) shows the columnar geology of the construction ground, (B) is a graph which shows the uniaxial compressive strength for every depth of the constructed improvement pillar.
[Explanation of symbols]
21 Excavation shaft 21a Discharge port 22 Excavation blade 23 Agitation blade 25 Boss 26 Co-rotation prevention blade

Claims (1)

In a ground improvement machine that excavates and pulls out a drilling shaft with a drilling blade at the tip and a plurality of stirrer blades above it by a predetermined excavation mechanism, and mixes and agitates soil and filler. ,
A co-rotation prevention blade having a diameter larger than the diameter of the excavation blade and rotatably inserted to the excavation shaft via a boss is provided between the excavation blade and the first stage stirring blade and the stirring blade. wings and together are disposed at two places between the second-stage stirring blades, and the co-rotation preventing blade, drilling stirring and mixing device the gap between the drilling blade and a stirring blade, characterized in that it is approximately 20cm .

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