JPH0525820A - Column row wall excavator - Google Patents

Abstract

PURPOSE:To lower revolving resistance of shafts to develop a column row wall with high degree of accuracy by mounting bits to the front end consisting of three or more shafts and, at the same time, arranging bits so that parts of loci of the bits overlap each other. CONSTITUTION:Bits 22, 24 and 26 are connected to an underground kneader 11 and the lower end thereof, and a wing shaft 14 and auger shafts 12 and 16 are arranged to the kneader 11 in parallel. A distance between the shafts is kept in constant by means of a coupling band 18 and a coupling device 20. Auger blades 28 and wing blades 30 are alternately arranged to the shaft along it. When a rotary device 27 is operated, the auger shafts 12 and 16 and the wing shaft 14 are rotated, excavation is made while injecting injection liquid from jets of the bits 22, 24 and 26. After that, part of an excavated earth is mixed with the injection liquid with rotation of the auger blades and the wing blades to equalize. According to the constitution, rotary resistance of shafts is lowered, and a column row wall with high degree of accuracy and high cut-off efficiency can be developed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column wall excavating device,
In particular, the present invention relates to a columnar wall excavating device having a high water-stopping capability for excavating the ground by ejecting a liquid such as cement milk from the tip and rotating and feeding the liquid.

[0002]

2. Description of the Related Art In the case of forming an in-situ stirring column wall, the auger shafts with auger blades were overlapped one by one, but when the next hole is opened, hole bending occurs and the efficiency is improved. It had the drawback of being bad. Therefore, in order to eliminate such problems, the column row wall excavation equipment has become multi-axis,
I try to open multiple holes at the same time. That is,
A plurality of auger shafts are arranged in a line, and auger blades of adjacent auger shafts are brought into non-contact mesh with each other to rotate the auger shafts in synchronization.

Further, as another column row wall excavating device, a screw blade and a stirring blade are alternately provided on one excavating shaft, and a stirring blade or a screw blade is provided on a stirring shaft adjacent to the excavating shaft. There is. The stirring blade of the stirring shaft is provided so as to be displaced with respect to the screw blade, and is formed in such a size that a part of the rotation locus of the stirring blade overlaps with the rotation locus of the screw blade (Japanese Patent Laid-Open No. Sho-61-86). 52-12470
6 gazette, Japanese Patent Publication No. 55-9978, Japanese Patent Publication No. 56-24744, and Japanese Patent Publication No. 59-45055).

[0004]

However, in the conventional column row wall excavator in which the excavation blade and the stirring blade are provided on one auger shaft, the drill holes on both outer sides of the column row wall have an asymmetrical cutout. Therefore, there is a drawback that the hole wall is damaged by the rotation of the stirring blade.
In particular, when the geology is a gravel layer, the stirring blade is susceptible to the resistance of the gravel, so the rotation resistance increases, and the stirring blade comes into partial contact with the hole wall, which causes hole bending. There is.

If one excavating shaft is provided with a screw blade and a stirring blade, the rotational resistance increases when kneading the earth and sand and gravel moved upward by the excavating blade during excavation, and the stirring blade is It has the drawback of being damaged in a short time. Further, when reversing the excavation axis and pulling out from the hole, soil and gravel are compacted between the agitating blade and the excavating blade, which may increase the rotational resistance and damage the agitating blade.

The present invention has been made in view of such circumstances, and an object thereof is to provide a column wall excavating device capable of forming a column wall with high accuracy by reducing the rotational resistance of the shaft. To do.

[0007]

In order to achieve the above-mentioned object, the present invention is to mount a bit on the tip which is composed of three or more shafts, and these bits have a part of the rotation loci of each bit mutually. In a column-row excavating device that is arranged so as to overlap and excavates the ground by rotating the bit, the shaft is an auger shaft in which spiral auger blades are provided at predetermined intervals in the axial direction. And wing shafts having plate-shaped wing blades provided at predetermined intervals in the axial direction alternately and with auger shafts positioned on both outer sides thereof, the auger blades and the wing blades. Is alternately arranged along the auger axis and the wing axis, and is formed in such a size that the rotation locus of the auger blade and a part of the rotation trajectory of the wing blade overlap each other.

[0008]

According to the present invention, the auger shafts and the wing shafts are alternately arranged and the auger shafts are located on both outer sides of the auger shafts. As a result, the column wall can be prevented from being damaged by the rotation of the wing blades, so that the column wall can be formed with high accuracy. Further, the auger blades and the wing blades are alternately arranged along the auger axis and the wing axis, and the rotation locus of the auger blade and a part of the rotation trajectory of the wing blade are formed so as to overlap each other. As a result, the rotational resistance of the auger shaft and the wing shaft can be reduced.

Further, by providing an auger blade having a diameter smaller than that of the auger blade between the auger blades of the auger shaft and between the wing blades of the wing shaft, the stirring and kneading effect of the earth and sand and the cement milk can be improved. Further, by providing a wing blade having a smaller diameter than the wing blade between the wing blades of the wing shaft, the effect of stirring and kneading the earth and sand and the cement milk can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a column wall excavating device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a pillar row wall excavating device 10 according to a first embodiment of the present invention.
The column row wall excavating device 10 is configured by connecting bits 22, 24, 26 described later to the lower end portion of the underground kneading device 11. The underground kneading device 11 is configured by a wing shaft 14 and two auger shafts 12 and 16 arranged on both sides of the wing shaft 14 side by side. Wing shaft 14 and auger shafts 12, 16
Are arranged parallel to each other with a constant inter-axis distance maintained by the connecting band 18 connected to the upper part and the connecting device 20 connected to the bit shaft. Reference numeral 21 is a joint that connects the shafts. The lower ends of the auger shafts 12 and 16 and the wing shaft 14 have the above-mentioned bits 22 and 2 respectively.
4, 26 are connected and these bits 22, 24, 26
Of these, the bit 24 connected to the wing shaft 14 is mounted slightly above the bits 22 and 26 on both sides. Further, the bits 22, 24 and 26 are so constructed that their outer peripheral portions are vertically overlapped with each other and have auger blades 28 and 28.
, And an injection port (not shown) for injecting an injecting liquid such as cement milk downward is formed at the tip thereof.

A rotating device 27 is connected to an upper part of the auger shaft 1 so that the rotating driving force is generated by operating the rotating device 27.
2, 16 and the wing shaft 14 are transmitted. As a result, the bits 22, 24 and 26 are rotated in the direction of the arrow in the figure. The auger shafts 12 and 16 have screw-shaped auger blades 28, 28 ... Attached to the auger shafts 12, 16 at regular intervals in the axial direction of the auger shafts 12, 16, respectively. It is provided at the opposite position. Further, the wing shaft 14 has a plate-shaped wing blade 30,
30 ... are inclined at a predetermined angle. These wing blades 30, 30 ... Are located between the auger blades 28, 28 ... And have a size such that the outer peripheral portion thereof vertically overlaps the outer peripheral portion of the auger blade 28 as shown in FIG. It is formed to the size

Next, the operation of the column row wall excavating device 10 configured as described above will be described. First, the rotating device 27 is operated to rotate the auger shafts 12 and 16 and the wing shaft 14, and at the same time, the excavation is started at the bits 22, 24 and 26 while injecting the injection liquid from the injection ports of the bits 22, 24 and 26. To do. When the excavation is continued, part of the earth and sand excavated by the auger blades 28, 28 of the auger shafts 12, 16 rises in the excavation hole and is discharged to the outside from the excavation inlet. Further, the remaining sediment not discharged is mixed with the injection liquid by the rotation of the auger blades 28, 28 ... And the wing blades 30, 30 ... Of the wing shaft 14. Then, the soil mixed with the injection liquid has a uniform density in the excavation hole 32 having a cross-sectionally connected shape shown in FIG.

Next, when the excavation by the pillar row wall excavating device 10 is completed, the pillar row wall excavating device 10 is vertically moved and pulled out from the excavation hole 32. At this time, the excavated earth and sand in the excavated hole 32 is
When moving the pillar row wall excavation device 10 up and down, the auger blades 28,
28 ... is transferred to above the excavation hole 32, and in the middle of the transfer, the auger blade 28 and the wing blades 30 and 30 are rotated to be kneaded with an injection liquid such as cement milk.

Therefore, the soil in the excavation hole 32 is agitated and kneaded with the cement milk by the rotation of the auger blades 28, 28 ... And the wing blades 30, 30. As described above, in this embodiment, only the auger blades 28 are attached to the auger shafts 12 and 16, and only the wing blades 30 are attached to the wing shafts 14, so that the auger blades are used to stir and knead the soil. The rotation resistance of the auger shafts 12 and 16 and the wing shaft 14 can be reduced as compared with the column row wall excavating device. Further, since the auger shafts 12 and 16 which are the guide holes are arranged on both sides, it is possible to suppress the hole bending without damaging the hole wall with the wing blades. In addition, the middle hole surrounded by the outer holes is not symmetrical even if it is a wing wing because the broken circles are symmetrically singing. The stirring effect can be improved without roughening the hole walls.

Further, since the auger blade 28 and the plate blade 30 are provided so as to overlap with each other in the vertical direction, the stirring effect of cement milk and earth and sand can be improved. On the other hand, the wall of the excavation hole 32 from which the pillar row excavation device 10 has been removed becomes a water blocking wall 34 (shown in FIG. 3) due to the solidification of cement milk, which prevents groundwater from leaking into the excavation hole 32. can do.

FIG. 4 shows a column row wall excavating device 36 according to the present invention.
According to the second embodiment of the present invention, the column row wall excavating device 36 has a small-diameter auger blade 38, 38 between the auger blades 28, 28 of the auger shafts 12, 16, and a wing of the wing shaft 14. Small-diameter auger blades 40, 40, ... Are provided between 30, 30 ,. The auger blade 38 is arranged in non-contact with the wing 30, and the auger blade 40 is arranged in non-contact with the auger blade 28.

Therefore, according to the second embodiment, the drill hole 32
When the earth and sand inside are transferred upward, they are agitated and kneaded by the wing blades 30 and the auger blades 38 opposed thereto, and the auger blades 28 and the auger blades 40 opposed thereto, so that the first embodiment shown in FIG. It is possible to improve the stirring effect of cement milk and earth and sand. Further, when the excavation diameter becomes large, a space is formed between the adjacent shafts, so that the agitation effect is enhanced by disposing the auger blade 40 having the small diameter.

FIG. 5 illustrates a column wall excavator 42 according to the present invention.
According to the column row wall excavating device 42, the wing blades 42, 42 with a small diameter are opposed to the auger blades 28, 28 ... Between the wing blades 30, 30. Is provided. The wing blades 42 are arranged in non-contact with the auger blades 28. Therefore, according to the third embodiment, when the earth and sand in the excavation hole 32 is transferred upward, the wing blade 30 and the auger blade 28 and the wing blade 42 opposed thereto are agitated and kneaded.
The stirring effect of cement milk and earth and sand can be improved more than in the first embodiment shown in FIG.

FIG. 6 shows an embodiment of a column row wall excavating device 10A in which five axes of the column row wall excavating device 10 shown in FIG. 1 are arranged, and FIG. 7 shows the column row wall shown in FIG. An example of a column-row excavator 36A in which five axes of the excavator 36 are arranged, and FIG.
An example of a column row wall excavating device 42A in which five axes of the column row wall excavating device 42 shown in FIG. In the present embodiment, the column row wall excavating device having three and five axes has been described, but the present invention is not limited to this and any auger shaft may be provided on both sides.

[0020]

As described above, according to the multi-axis excavator according to the present invention, the auger shafts and the wing shafts are alternately arranged and the auger shafts are located on both outer sides of the auger shafts. The auger blades and the wing blades are alternately arranged along the auger axis and the wing axis, and the rotation path of the auger blade and a part of the rotation path of the wing blades are formed so as to overlap each other. It is possible to form a column wall with high accuracy and high water resistance by reducing the rotation resistance of.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a column row wall excavating device according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

[Fig. 3] Cross-sectional view of a drill hole

FIG. 4 is a front view showing a second embodiment of the column wall excavating device according to the present invention.

FIG. 5 is a front view showing a pillar row wall excavating device according to a third embodiment of the present invention.

6 is a front view showing an embodiment of a column-row excavating device in which five axes of the column-row excavating device shown in FIG. 1 are arranged.

FIG. 7 is a front view showing an embodiment of a column-row excavating device in which five axes of the column-row excavating device shown in FIG. 4 are arranged.

8 is a front view showing an embodiment of a column-row excavating device in which five axes of the column-row excavating device shown in FIG. 5 are arranged.

[Explanation of symbols]

10, 36, 42 ... Pillar wall excavator 12, 16 ... Auger axis 14 ... Wing axis 22, 24, 26 ... bit 28, 38, 40 ... Auger wings 40, 44 ... Wing wings

Claims (3)

[Claims] 1. A bit, which is composed of three or more shafts, is attached to the tip thereof, and these bits are arranged so that the rotation loci of the respective bits partially overlap each other. In a column row wall excavating device for excavating the inside, the shaft is provided with an auger shaft in which spiral auger blades are provided at predetermined intervals in the axial direction, and plate-shaped wing blades are provided at predetermined intervals in the axial direction. And wing shafts are alternately arranged so that the auger shafts are located on both outer sides thereof, and the auger blades and the wing blades are alternately arranged along the auger shafts and the wing shafts. In addition, the column row wall excavating device is characterized in that the rotation locus of the auger blade and a part of the rotation locus of the wing blade overlap each other. 2. The column row wall excavating device according to claim 1, wherein auger blades having a diameter smaller than that of the auger blades are provided between the auger blades of the auger shaft and between the wing blades of the wing shaft. . 3. The column row wall excavating device according to claim 1, wherein wing blades having a smaller diameter than the wing blades are provided between the wing blades of the wing shaft.