JPH09151480A - Ground excavating construction method and excavating device used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve constructing performance by agitating and cutting earth, excavated by an excavating bit, by a normal-reverse rotatable agitating body disposed above the excavating body, not coaxial with the excavating bit and smaller in diameter than the excavating bit. SOLUTION: Earth excavated by rotating an excavating bit 5 is agitated and cut by an agitating body 7 provided above the bit 5, so that the earth is fined, and the earth is prevented from being corotated together with the bit 5 because of the agitating body 7. The agitating body 7 is installed in a rotatory-escavating area of the diameter of the bit 5 to heighten agitating efficiency, and a plurality of agitating bodies 7 are provided to further improve efficiency. If desired, the agitating body 7 is made an agitating blade to cut the earth simultaneously with earth agitating action. An excavating place is thereby made uniform over the upper and lower parts, and in the case of filling cement milk, the cement milk is mixed on the average so as to be able to form a cylindrical body with uniform strength from the top to the bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of excavating the ground for strengthening the bearing capacity of the ground, prevention of subsidence, strengthening of seismic resistance, and the like when using it for building or mounting a heavy structure or the like. The present invention relates to a drilling device.

[0002]

2. Description of the Related Art A conventional ground excavation method and an excavator used therefor are excavated by an excavation bit provided at the tip of an excavation shaft of a construction machine, and usually one excavation bit provided on one rotary shaft. Had been excavated by. There are also cases where several rotary shafts are provided with drilling bits at their tips and several drilling bits are used for drilling, but even in this case, the drilling bits can be of the same diameter and must be lined up side by side. is there.

[0003]

When constructing or placing a heavy structure or the like, the support force of the foundation ground that supports these structures or the like is strengthened or prevented from sinking, or deformation or displacement is prevented. In order to reduce the pressure and strengthen the earthquake resistance, a solidifying liquid such as cement milk is poured into the foundation ground by the construction machine along with the rotation of the drill bit to form a columnar body that acts as a pile. .

In this case, when the soil excavated by the excavating bit is excavated in a uniform state from the top to the bottom, the formed columnar body is strong without any partial strength. The excavation of the chisel was rather rough, and sometimes the soil co-rotated with the excavation bit and the excavation was not performed finely, so the excavation was not sufficient.

In view of the above points, the present invention is to provide a ground excavation method capable of finely and uniformly agitating and cutting the soil excavated by the excavation bit, and an excavation device used therefor.

[0006]

According to the excavation method of the present invention, the excavation bit is rotated to excavate the ground, and at the same time, the excavated soil is located above the excavation bit in a different axis from the excavation bit and has a smaller diameter than the excavation bit. It is characterized by agitating and cutting with a rotatable agitator. Further, it is desirable to stir and cut the agitator within a rotary excavation area having the diameter of the excavating bit, and it is also possible to stir and cut with a stirrer blade that is a stirrer and to stir and cut with a stirrer blade that is a stirrer. May be.

Further, the excavating device of the present invention is characterized in that the excavating bit is provided with an agitating body having a different axis from the excavating bit and having a diameter smaller than that of the excavating bit and capable of rotating in the normal and reverse directions. The agitator is preferably provided in a rotary excavation area having the diameter of the excavating bit, and a plurality of agitators may be provided. The stirring body may be a stirring blade or a stirring blade.

Therefore, in the excavation method of the present invention and the excavator used for the excavation method, the soil excavated by the rotation of the excavation bit is
Furthermore, in order to agitate and cut with the agitator above the drill bit,
The soil is subdivided and the presence of the agitator prevents the soil from co-rotating with the drill bit.

[0009] Then, the stirring member is installed in the rotary excavation area having the diameter of the excavating bit, and stirring is most effective.
Further, if a plurality of stirring bodies are provided and stirring and cutting are performed, the efficiency becomes higher. Further, if the stirring body is a stirring blade, it is possible to cut the soil at the same time as stirring, and the stirring blade alone can achieve the same effect.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of an excavating device of the present invention, and FIG. 2 is a plan view showing the operation of the same.
FIG. 3 is a side view of a construction machine equipped with the excavation device of the present invention.

In the apparatus of the present invention, rotary shafts 4 and 4'are inserted into a table 3 provided in the excavation portion 2 in front of the construction machine 1.
The rotary shaft is provided on the center and both sides thereof on three straight lines, and a drill bit 5 is provided below the central rotary shaft 4.
The rotating shaft 4 is formed in a hollow pipe shape so as to supply a liquid material such as cement milk to the inside. A drive motor 6 for rotating the rotating shaft 4 is provided on the table 3 and rotates in the forward and reverse directions.

The rotary shafts 4'on both sides of the rotary shaft 4 are located slightly above the rotary shaft 4, and an agitator 7 is provided below the rotary shaft 4. The stirring body 7 is composed of a stirring blade 7A and a blade portion 7B detachably attached to the stirring blade 7A with a bolt or the like.
If B is attached and used, it becomes a stirring blade, and if removed, both can be used as a stirring blade.

The stirring body 7 has a smaller diameter than the drill bit 5, the rotary shaft 4'is within the rotary drilling area of the drill bit 5 (shown by the chain line in FIG. 2), and the rotary stirring area of the stirring body 7 (see FIG. (Indicated by the chain line 2) is also within the rotary excavation area of the excavation bit 5. Of course, part of the rotary stirring area of the stirring body 7 is the drill bit 5
You may leave the range of the rotary excavation area.

The stirrer 7 may transmit the rotation of the drive motor 6 rotating in the forward and reverse directions to the rotating shaft 4'by a gear mechanism (not shown), and the rotating shafts 4 and 4'independently rotate in the forward and reverse directions. A drive motor may be provided.

The rotating shafts 4 and 4'rotate in the opposite directions as shown by the arrows in FIG. Of course, the directions of rotation may be the same, and even if the rotating shaft 4'is stopped and the agitator 7 is stopped, the agitating and cutting actions are passively performed.

Further, one or more agitators 7 can be provided in the rotary excavation area of the excavation bit 5.

[0017]

According to the present invention, since the soil excavated by the rotation of the excavation bit is further stirred and cut by the agitator, the soil is subdivided and the soil is prevented from co-rotating with the excavation bit. To be done. In this way, due to the synergistic effect of the rotation of the drill bit and the rotation of the stirring body having a diameter smaller than that of the drill bit, double drilling can be performed, and the drilling points are in a uniform state across the top and bottom, and if cement milk or the like is injected, It is a useful invention that can be mixed on average to form a columnar body having a uniform strength from top to bottom and contributes to ground improvement.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing an embodiment of the device of the present invention.

FIG. 3 is a side view of a construction machine equipped with the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Construction machine 2 Excavation part 3 Table 4 Rotation axis of excavation bit 4'Rotation axis of stirring body 5 Excavation bit 6 Drive motor 7 Stirring body 7A Stirring blade 7B Blade part

Claims (9)

[Claims] 1. An excavating earth is excavated by rotating an excavating bit, and at the same time, the excavated soil is stirred and cut by a stirring body having a diameter smaller than that of the excavating bit whose axis is different from that of the excavating bit above the excavating bit. A method of excavating the ground characterized by: 2. The ground excavation method according to claim 1, wherein the agitator is agitated and cut in a rotary excavation area having a diameter of an excavation bit. 3. The ground excavation method according to claim 1, wherein the stirring blade is a stirring blade for stirring and cutting. 4. The ground excavation method according to claim 1 or 2, wherein stirring and cutting are performed by a stirring blade that is a stirring body. 5. An excavating device, characterized in that an agitating body having a diameter smaller than that of the excavating bit having a different axis from that of the excavating bit is provided above the excavating bit. 6. The excavating device according to claim 5, wherein the agitator is provided in a rotary excavating area having a diameter of the excavating bit. 7. The excavating device according to claim 5, wherein a plurality of stirring bodies are provided. 8. The excavating device according to claim 5, 6 or 7, wherein the stirring body is a stirring blade. 9. The excavating device according to claim 5, 6 or 7, wherein the stirring member is a stirring blade.