JPH0633463A - Multi-shaft excavator - Google Patents

Abstract

PURPOSE:To form a continuous wall having excellent linearity by installing a guide shaft to one side on a line of an excavator provided with a plurality of excavation shafts whose shaft core is laid out on the line. CONSTITUTION:A plurality of guide holes are bored at a specified span. A guide pit 14 installed to the lower end of a guide shaft 11 is inserted into a first guide hole. Excavation cutting blades 6 of excavation shafts 10A, 10B and 10C are used to cut holes. The ground is excavated so that the cross section of excavation may be squared in shape by spraying a jet current from a jet nozzle installed to the outer periphery of the body of the title device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis excavator used to construct a continuous wall in the ground.

[0002]

2. Description of the Related Art The ground is drilled into a wall shape, a mixed liquid such as cement is discharged from the tip of a kneading shaft, and mixed with in-situ soil in the soil to form a continuous wall for construction and civil engineering underground. The in-situ soil mixing method, which forms earth retaining walls for construction and water-stop walls for sheet pile earth retaining construction, has been effectively and widely used.

A multi-axis kneading auger machine used for forming the continuous wall will be described with reference to FIGS. 14 and 15.

In the figure, a drive device 3 is stretched up and down on a guide post 2 provided upright on a self-propelled carriage 1. A multi-spindle device 4 is connected to a lower portion of the drive device 3, and a plurality (three in the illustrated example) of kneading shafts 5A, 5B and 5C (hereinafter, referred to as reference numeral 5 in the following description) are connected to the multi-spindle device 4.
Is used).

An excavating blade 6 is provided at the lower end of the kneading shaft 5, and a screw-shaped moving blade 7 and a rod-shaped kneading blade 8 having the same diameter as the excavating blade 6 are provided above the excavating blade 6. The tips of the adjacent kneading blades 8 cooperate with each other to mix the in-situ soil and the mixed liquid to form a continuous wall unit. If necessary, H-section steel or sheet pile is erected on the continuous wall to improve the soil retaining property and the water stopping property.

In the above conventional multi-screw kneading auger,
Since the outer kneading shafts 5A, 5C and the central kneading shaft 5B are rotated in mutually opposite directions to perform the mixing, the rotational reaction force of the drilling blade 6 becomes unbalanced to 2: 1 and the unit of the continuous wall is formed. Linearity is impaired.

Further, the axial distance between the kneading shafts 5 is restricted because it is necessary to overlap the rotation range of the excavating blades 6 to make continuous drilling holes.

[0008] Further, the H-section steel is set in the axial line of the kneading shaft, which is subject to the restriction.

Therefore, the applicant of the present invention has filed Japanese Patent Application Laid-Open No. 2-11540.
In Japanese Patent Publication No. 6, a multi-screw kneading auger having good linearity and capable of forming a continuous wall without restriction of the H-shaped steel upset position and having a large distance between kneading shafts was proposed.

According to the proposal, in a multi-screw kneading auger equipped with a plurality of kneading shafts used to form a continuous wall in the ground, a chain drive is provided near the lower end of the kneading shaft at an angle to the kneading shaft. Is equipped with a drilling blade.

The proposal itself is effective, but even if the rotational reaction force is in one direction, it is not a structure that receives the reaction force, so there is a problem with the linearity of the continuous wall.
In addition, the chain is apt to be broken and lacks reliability.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly reliable multi-axis excavator capable of constructing a continuous wall having good linearity.

[0013]

According to the present invention, a guide shaft is provided on one side of an excavator including a plurality of excavating shafts whose axes are arranged in line.

Further, according to the present invention, guide shafts are provided on both sides of an excavator having a plurality of excavation shafts whose axes are arranged in line.

According to the invention, a jet nozzle is provided on the guide shaft.

The guide shaft is provided with a cylindrical guide bit having a cutout portion that overlaps with the bit of the adjacent excavation shaft, and a pair of jet nozzles directed tangentially is provided outside the guide. preferable.

[0017]

In the continuous multi-axis excavator constructed as described above, the guide hole is preliminarily drilled, and the guide shaft is guided by the guide hole, and the drill shaft is drilled. Therefore, since the reaction force is received by the guide shaft, a plurality of continuous holes can be drilled with good linearity. Further, as the guide hole, the drill hole at the end portion of the primary drill hole that has been drilled is used, and the continuity with the secondary drill hole can be maintained.

Further, the jet flow is jetted from the jet nozzle to excavate the ground and clean the excavation blade so that the excavation cross section becomes rectangular.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

In these drawings, the parts corresponding to those in FIGS. 14 and 15 are designated by the same reference numerals and their duplicate description will be omitted.

1 to 3, a plurality of (three in the illustrated example) rotatable excavating shafts 10A, 10B and 10 are provided.
C (reference numeral 10 is used in the following generic name) and one non-rotating guide shaft 11 are arranged at equal pitches so that their axes are located on the straight line L. The excavation shafts 10A to 10C are connected to each other by an interference prevention bracket 12 that also serves as a plurality of bearings.
Of the two, several brackets 12A have guide shafts 11
A clamp bracket 13A that selectively locks is connected.

Referring also to FIGS. 4 to 6, the guide shaft 11
A guide bit 14 is provided at the lower end of the. The main body 15 has a cylindrical shape, and a portion overlapping with the outer diameter D of the rotation locus of the excavating blade 6 and the moving blade 7 of the adjacent excavating shaft 10A (the outer diameter R of both and the kneading blade 8 are formed to be equal) is circular. It is formed in the arc-shaped recess 16. A pair of jet nozzles 17 that jet the jet stream J in parallel with the straight line L, that is, in the tangential direction are provided on the outer peripheral portion of the main body 15.

Next, the mode of excavation will be described.

In FIG. 7, the guide holes H1,
H2 ... is drilled, and as shown in FIG.
4 is inserted into the first guide hole H1, and the excavation shafts 10A, 1
The holes h1, h2, h3 are drilled by 0B and 10C, and the ground is excavated by the jet streams J, J so that the excavation cross section becomes rectangular. Next, holes h1, h2, h3 are similarly drilled for the guide hole H2, and the ground is continuously excavated into a rectangular cross section by the jet streams J, J. At this time, the excavation reaction force of the excavation shaft 10 is guided through the guide bit 14 to the guide hole H.
Since it is received at 1, H2 ..., a straight line with a rectangular cross section is preferable.

As shown in FIG. 8, the guide bit 1
4 has a length L (for example, 500 to
(700 mm) Excavate in a lowered state. This aspect is
Although the guide performance by the guide bit 14 is good, however, the clamp of the guide shaft 11 by the clamp block 13B is released before the length L of the planned excavation depth, and the guide bit 1 is released.
Work to free 4 is required.

On the other hand, as shown in FIG. 10, the guide bit 14 and the excavating blade 6 are excavated at the same level, or
As shown in FIG. 11, in the aspect of excavating the guide bit 14 with the length L1 (for example, 300 to 550 mm) raised from the excavating blade 6, the guide bit 1 is set as described above.
Although the work of releasing the clamp of No. 4 becomes unnecessary, it is suitable for soft ground because the guide property is slightly inferior.

FIG. 11 shows another mode of excavation. Next to the first excavation of the guide hole H1, the second excavation is performed using the hole h3 as a guide hole. In this mode, the linearity is further improved, and the strength of the jet stream J is smaller than that in the above mode.

12 and 13 show another embodiment of the present invention, which is an example in which guide shafts 11 and 11A are provided on both sides of the excavation shafts 10A to 10C, respectively. In this embodiment, at the time of excavation, the guide holes H1 and H2 shown in FIG.
It is possible to further improve the linearity by performing the second excavation using H2 and H3.

[0029]

Since the present invention is configured as described above, it is possible to form a continuous wall having good linearity.

Further, since the ground is excavated in a rectangular cross section by the jet flow, the reliability can be improved as compared with the conventional chain-driven excavating blade.

[Brief description of drawings]

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

FIG. 2 is a view showing a lower portion of FIG.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a front view showing a guide bit.

5 is a sectional view taken along the line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a plan view illustrating an aspect of excavation.

FIG. 8 is a front view illustrating an aspect of excavation.

FIG. 9 is a front view illustrating another aspect of the position of the gaibit.

FIG. 10 is a front view for explaining another mode of the gaibit position.

FIG. 11 is a plan view illustrating another aspect of excavation.

FIG. 12 is a side view showing another embodiment of the present invention.

13 is a front view of FIG.

FIG. 14 is a side view showing a conventional auger machine.

FIG. 15 is a front view showing the kneading shaft of FIG.

[Explanation of symbols]

 D ... Rotation track outer diameter H ... Guide hole h ... Hole J ... Jet flow L ... Straight line 2 ... Guide post 3 ... Driving device 4 ... Multi-axis device 5A 5B, 5C ... kneading shaft 6 ... excavating blade 7 ... moving blade 8 ... kneading blade 10A, 10B, 10C ... excavating shaft 11, 11A ... guide shaft 12, 12A ... -Interference prevention bracket 13 ... Clamp block 14 ... Guide bit 15 ... Main body 16 ... Arc-shaped recess 17 ... Jet nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hachiro Hatada 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Within Chemical Gault Co., Ltd. (72) Inventor Tsutoo Takahashi 1-6-4 Moto-Akasaka, Minato-ku, Tokyo No. Chemikaruguto Co., Ltd. (72) Inventor Yoshimi Miura 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Chemikaruguto Co., Ltd. (72) Inventor Tetsuo Nakamura 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Within Chemical Gout Co., Ltd.

Claims (3)

[Claims] 1. A multi-axis excavating device, wherein a guide shaft is provided on one side of the line of an excavator having a plurality of excavating shafts whose axes are arranged in line. 2. A multi-axis excavating device, wherein guide shafts are provided on both sides of an excavator including a plurality of excavating shafts whose axes are aligned. 3. The multi-axis excavator according to claim 1, wherein a jet nozzle is provided on the guide shaft.