JPH0444706Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an auger screw of an earth auger for excavating pile holes as foundation work in the fields of architecture and civil engineering.

[Conventional technology]

Instead of discharging all of the excavated soil to the surface, if some or most of it is compacted onto the hole wall, it not only saves the effort of draining the soil, but also prevents the collapse of the hole wall and reduces friction during excavation. Since the resistance is also reduced, it is possible to excavate to great depths, and even if there are boulders or boulders in the ground, continuous excavation is possible while adjusting the surface pressure of the cutting edge required for excavation at will.

As shown in Japanese Patent Publication No. 59-38394, an auger capable of consolidating such excavated earth and sand has a screw blade 1 with a consolidation blade 2 formed of a curved vertical plate on the outside. (See Figure 8).

As shown in FIG. 8, the consolidation blade 2 may be provided outside the screw blade 1 across a plurality of blades, or, although not shown, the screw blade may be disposed intermittently at a location where no screw blade is provided. There are some that protrude radially.

[Problem that the invention attempts to solve]

In any case, in the conventional auger crew of the excavated soil consolidation type, the screw blade and the consolidation blade are provided separately and independently, and the soil lifting action of the excavated soil by the screw blade is carried out by the consolidation blade. Because of this interruption, the soil lifting action becomes intermittent and the screwing action of the screw blade into the soil is inhibited, making it impossible to excavate efficiently. For example, in the case shown in Fig. 8, the consolidation blade 2 only performs the action of consolidating the earth and sand on the hole wall, and there is no screwing action at all, and moreover, the consolidation blade 2 only performs the action of consolidating the earth and sand on the hole wall, and furthermore, the consolidation blade 2 only performs the action of consolidating the earth and sand on the hole wall, and there is no screwing action at all. Since the hole walls are compacted, the resistance during compaction increases, making it impossible to excavate to great depths, which was the intended purpose. Particularly when excavating a gravel layer, large or larger pieces of gravel are pressed against the hole wall at once, which increases the excavation resistance at once and places an excessive load on the drive unit, making it impossible to excavate.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
By increasing the relationship between the screw blade and the excavated soil compaction part, the screwing action of the screw blade is not inhibited, and the excavated soil can be gradually consolidated into the hole wall without difficulty, and the structure is simple and inexpensive to manufacture. The purpose of the present invention is to provide an auger screw for compacting excavated soil.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention shifts the screw blades discontinuously on the outer periphery of the rod at intervals of approximately one pitch, and at the interrupted portions, the ends of the upper blades are slightly different from the ends of the lower blades. form,
The lower part of the blade of each pitch is a reduced diameter part whose surface area gradually decreases toward the end, and this reduced diameter part for each pitch has intermittent positions at different positions in the axial direction, and is a plane perpendicular to the axis. The gist is that the intermittent positions before and after the above are shifted.

[Effect]

According to the present invention, the earth and sand cut by the bit of the auger head at the tip is transferred upward by the lifting action caused by the rotation of the screw blade, and is pushed out to the lower side of the next screw blade at the continuation part of the upper end.
The lower part of each screw blade has a reduced diameter section to provide a gap for receiving the earth and sand, and the earth and sand that enters here are directly pressed against the hole wall surface and compacted.

Furthermore, since the portions where the earth and sand are consolidated are sequentially shifted relative to each other in accordance with the unevenness of the discontinuous portions in the axial direction of the rod, eccentric rotation of the screw rod is prevented and smooth rotation occurs without vibration. It is possible to perform excavation and consolidation.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a side view showing the first embodiment of the excavated soil compaction type auger screw of the present invention, and Fig. 2 is an enlarged side view of a portion of the same.
It is a screw blade formed on the outer periphery of.

The screw blades 3a, 3b, . The ends of the screw blades 3b are slightly different from each other so that the upper blade 3a is shifted upward.

In the case of this embodiment, if the thickness of the screw blades 3a, 3b for each pitch is a, each blade has a side edge surface 6 having a height of a, but the lower screw blade The upper end of the screw blade 3b is extended to reach the middle of the side edge surface 6 of the upper screw blade 3a.

In addition, each screw blade 3a, 3b... is the third
As shown in Figures 5 to 5, in the upper half of about half a pitch, the spiral diameter is uniform like in a normal auger screw, but in the lower half of the remaining half pitch, the surface area (helix This is a reduced diameter portion 7 in which the diameter (diameter) gradually decreases. In Fig. 2, the chain line is assumed to be a screw blade with a normal diameter, but by using the reduced diameter part 7 as described above, it is possible to compare the case where a normal screw blade is provided outside the reduced diameter part 7. Thus, a gap 8 is formed.

Furthermore, the intermittent portions 5 of the screw blades 3a, 3b, .
Care has been taken to prevent the screw shaft from wobbling due to eccentric rotation. Such a shift may be made so that each screw blade 3a, 3b, .
If the continuation part 5 and the reduced diameter part 7 are misaligned by about 90 degrees as described above, the continuation part 5 and the fourth upper continuation part 5 will match in the vertical position.

This deviation can be selected as appropriate, such as about 30° or about 60°.

Next, the method of use and operation will be explained. Although not shown in the drawings, the earth and sand cut by the auger head at the tip of the rod 4 is pushed up along the upper surface as the screw blades rotate. In this way, the earth and sand transferred along the upper surface of the lower screw blade 3b reaches the discontinuous portion 5, is sent directly to the gap 8, is pressed against the hole wall by the side edge surface 6 of the upper screw blade 3a, and is consolidated. Ru.

The entire auger screw is pushed into the ground in a drilled shape, and soil consolidation at the screw blade side edge surface 6 is consolidated into the hole wall only at the interrupted side edge surface at one location. Instead, excess excavated soil is pushed up by the screw blades,
The continuation section 5 will be lifted to the next interrupted section.
This is done sequentially from the bottom. Furthermore, as described above, since each continuation portion 5 is offset in the axial direction of the rod 4, eccentric rotation of the screw rod 4 is prevented, and excavation and consolidation can be performed.

Also, if this is done while pouring out a liquid such as water, bentonite stabilizer, or cement milk from the tip of the rod 4, the excavated soil will be mixed with these and tightened against the hole wall, making the consolidation more effective. . The soil and liquid can be stirred in the continuation section 5.

FIGS. 6 and 7 show a second embodiment of the present invention, in which each screw blade 3a, 3b... is thin, and the reduced diameter part 7 has a side plate 9 hanging down on its outer periphery. Form. Since the auger is sometimes reversed, the side plate 9 is formed into a box shape by surrounding the lower surface and side edges thereof, and is designed to prevent dirt from entering the inside when the auger is reversed.

Looking at the relationship between the lower screw blade 3b and the upper screw blade 3a, in the continuation portion 5, the extension of the upper surface end of the lower blade 3b reaches the middle of the side plate 9 of the upper blade 3a.

The method of use is the same as that of the first embodiment, but the earth and sand pushed up along the upper surface of the screw blade 3b is transferred to the continuation portion 5 of the screw blade 3a.
is delivered to the outer surface of the side plate 9, where it is consolidated into the hole wall.

[Effect of idea]

As mentioned above, the excavated soil consolidation type auger screw of the present invention is capable of gradually consolidating the earth and sand carried by the screw blades into the hole wall without any difficulty to form a strong consolidation wall. It does not inhibit the embedding effect at all. In addition, since the screw blades can be used to compact the earth and sand, the structure is simple and can be manufactured at low cost.
You can get something that is highly durable.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the first embodiment of the excavated soil compaction type auger screw of the present invention, Fig. 2 is an enlarged side view of the same part, and Figs. A-A line, B-B line, C-C line sectional view, No. 6
The figure is a side view showing a second embodiment of the present invention, FIG. 7 is a partially cutaway partially enlarged view of the same, and FIG. 8 is a side view showing a conventional example. 1...screw blade, 2...consolidation blade, 3,3
a, 3b... Screw blade, 4... Rod, 5
...Continuation part, 6...Side edge surface, 7...Reduced diameter part, 8...
...Gap, 9...Side plate.

Claims (1)

[Claims for Utility Model Registration] (1) Screw blades are discontinuously shifted on the outer circumference of the rod at intervals of approximately one pitch, and at the interrupted portions, the upper blade ends are slightly different from the lower blade ends upwards. The lower part of the blade of each pitch is a diameter-reduced part whose surface area gradually decreases toward the end, and the diameter-reduced part of each pitch has intermittent positions at different positions in the axial direction. An excavated soil compaction type auger screw characterized by the discontinuity positions of the front and back being staggered on a plane perpendicular to . (2) The excavated soil compaction type auger crew according to claim 1 of the utility model registration claim, wherein the difference in level is equal to or less than the thickness of the upper blade. (3) The excavated soil compaction type auger crew according to claim 1, wherein a hanging side plate is provided on the outer periphery of the reduced diameter part, and the difference in level is equal to or less than the height of the side plate.