JP3040592U - Large diameter vertical hole drilling tool - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an excavator capable of efficiently excavating a large-diameter vertical cross-section even when the ground is hard. SOLUTION: A perfect circular vertical member 4 and an intermittent circular vertical member 5 are concentrically attached to a lower surface 3 of a disk that is pressed against the ground while rotating, and the lower ends of the vertical members 4 and 5 are circular to the ground. A bit that cuts and forms a groove in advance,
The part sandwiched between the vertical members 4 and 5 is cut with the bit.
The cutters 7 for cutting between the formed circular grooves are mounted respectively.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a drilling tool for drilling a large-diameter vertical hole in the ground.

[0002]

[Prior art]

 Conventionally, as a drilling tool for excavating a large-diameter vertical hole in the ground, a large number of cutting tools such as roller cutters were attached to the lower surface of the disk, and while rotating this disk, it was pressed against the ground surface, and the cutting tool made a circular shape. It is known that the hole is drilled in full section.

By the way, in the conventional example in which a large number of cutting tools such as roller cutters are pressed against a flat ground surface to completely cut down the ground surface, when the ground is hard, each cutting is performed. There is a problem that the cutting efficiency is poor and the work efficiency cannot be improved because the ground resistance acting on the tool is large.

[0004]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to improve the above-mentioned conventional example, and to provide an excavator capable of efficiently excavating a cross section of a large-diameter vertical hole even when the ground is hard.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the large-diameter vertical hole excavator (hereinafter referred to as the excavator of the present invention) has a perfect circular shape and an intermittent circular shape on the lower surface of the disk that is pressed against the ground while rotating. The vertical members are attached in concentric circles, the lower end of each vertical member is a bit that cuts and forms a circular groove in the ground in advance, and the part sandwiched by each vertical member is cut and formed by the bit described above. The cutters that cut between the circular grooves are installed.

The “intermittent annular vertical member” referred to in the present invention is a shape obtained by dividing an annulus, has an arcuate cross section, and is arranged along the circumference at appropriate intervals. .

Further, the “cutter” in the excavator of the present invention corresponds to the “cutting tool such as a roller cutter” in the above-mentioned conventional example, and in the present invention, the cutting efficiency of the cutter is determined by the rotation path. A bit is formed at the lower end of the vertical member on the ground on both sides to form a groove in advance to improve the groove.

[0008]

[Embodiment of the invention]

 The excavator according to the present invention is used for excavating a large-diameter hole (for example, about 1 to 4 m), and FIGS. 1 and 2 show an embodiment in the case of a relatively large diameter. FIG. 4 shows examples of comparatively small diameters.

In FIGS. 1 and 2, 1 is a power transmission shaft having an upper end coupled to a drive device (not shown), 2 is a disc fixed to the lower end of the power transmission shaft 1, and the disc 2 is a power transmission shaft. Upon receiving a strong rotational force and thrust from the transmission shaft 1, the lower surface 3 of the transmission shaft 1 rotates in one direction while being pressed against the ground.

Reference numeral 4 denotes a complete annular vertical member which is provided on the lower surface 3 of the disk 2 so as to project downward, and 5 is also a discontinuous annular vertical member. In the embodiment shown in FIGS. Vertical members 4 are respectively arranged on the outer peripheral portion and the central portion of the lower surface 3, and two vertical members 5 are concentrically arranged between them.

A plurality of bits 6 for ground cutting are attached to the lower ends of the vertical member 4 and the vertical member 5, respectively, and the ground below the vertical member 4 and the vertical member 5 is preceded by the rotation of the disk 2. A circular groove is cut and formed.

A plurality of roller cutters 7 are attached to the annular portions between the vertical members, respectively, so as to cut the annular portions between the circular grooves cut and formed by the bit 6, but the outer cutters near the outer portion. A relatively large roller cutter 7 is used, and a relatively small roller cutter 7 near the center is used.

A cantilever type roller cutter 8 extends through an opening formed in the vertical member 5 inside the vertical member 5 in the central portion, and the ground in the central portion is cut by the roller cutter 8.

The cutting shear cut by the bit 6 and the roller cutters 7 and 8 enters the space 11 in the disk 2 through the shear intakes 9 and 10 provided in the lower surface 3 of the disk 2 and is temporarily held. Then, it will be discharged to the ground by appropriate means.

In the embodiment shown in FIG. 3 and FIG. 4, the intermittent circular vertical member 5 is provided on the outer peripheral portion of the lower surface 3 of the disk 2, and the complete circular vertical member 4 is provided at the central portion. Although the details are different, the basic points are the same as those of the embodiment shown in FIGS.

The excavator according to the present invention is for use in medium excavation in a construction method in which a casing having a bit attached to the tip is pressed into the ground while rotating in one direction and the inside thereof is excavated by an appropriate excavator. It can also be used as a drilling tool, but in this case, the vertical member on the outer periphery can be omitted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an arrangement of a vertical member and a cutter (roller cutter) according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view showing an arrangement of a vertical member and a cutter (roller cutter) according to another embodiment of the present invention.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

1: Power transmission shaft, 2: Disc, 3: Lower surface, 4: Vertical member,
5: vertical member, 6: bit, 7: roller cutter, 8: roller cutter, 9: shear inlet, 10: shear inlet, 11: space.

Claims (1)

[Utility model registration claims] 1. A perfect circular and an intermittent circular vertical member are concentrically attached to the lower surface of a disk that is pressed against the ground while rotating, and a circular groove is cut in the ground at the lower end of each vertical member in advance. A large-diameter vertical hole excavator characterized in that a bit to be formed and a cutter for cutting between the circular grooves cut / formed by the bit are mounted in a portion sandwiched between the vertical members.