JPH07217360A - Excavating device - Google Patents

Abstract

PURPOSE:To prevent loss of balance, and to bore a deep pit efficiently by arranging a roller cutter in a point symmetric manner to the center of a rotating and driving cylindrical section or bringing a part of the roller cutter to a displaceable state with a cutter bit. CONSTITUTION:When a pit is dug by using an excavator 6, on which a cutter bit 2 is mounted, and the excavator 6 collides with a base rock, etc., and efficiency is deteriorated, a roller cutter 11 is installed, the excavator 6 is replaced with an excavating device 10 crushing the base rock by an impact, and excavation is conducted. Since the roller cutter 11 is brought to a point symmetric state to the center of a cylindrical section 12, a balance is not thrown off in the cylindrical section 12 and the cylindrical section 12 is rotated, thus performing boring. A part of the roller cutter 11 is used as the cutter bit 2, and the excavating device can also correspond to both soil and the base rock. Compressed air fed into a sealed space in the cylindrical section 12 is ejected from the front end of the excavating device 10, and chips generated by excavation is pushed out to the outside from clearances between the cylindrical section 12 and the ground, and excavation is carried out. Accordingly, the deep pit can be excavated efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating device for excavating a deep hole in a foundation work of a building or the like.

[0002]

2. Description of the Related Art As buildings have become taller in recent years,
It is also necessary to excavate deeper holes in foundation works. Conventionally, when forming a deep hole for filling a foundation pile or the like, as shown in FIG. 10, a large number of cutter bits 2 are attached to the tip of a rotationally driven cylindrical portion 1 at intervals and abutted on the ground. While rotating the cylindrical portion 1 to embed the cylindrical portion 1 while cutting the ground, insert the excavator from the upper opening of the inner space 3 of the cylindrical portion 1 and leave it in the center of the cylindrical portion. The remaining soil 4 that has been removed is removed to form holes 5.

[0003]

However, when the hole is deep, it often hits the rock in the course of the excavation, and the conventional excavator equipped with the cutter bit 2 is inefficient, and in some cases, the excavation can be performed. It was sometimes gone. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an excavation device that crushes a rock by impacting rock by rotatably driving the tip of the cylinder.

[0004]

In the excavator according to the present invention, a roller cutter, which is rotatably supported by the shaft and is composed of a cutter body, is provided with a space along the tip of the cylindrical portion that is rotationally driven. Everything is arranged symmetrically with respect to the center of the cylindrical part, and when the tip roller cutter of the cylindrical part is brought into contact with the ground to drive the cylindrical part to rotate, the cutter body of the roller cutter rotates. That was the means of solving the problem.

The roller cutter attached to the tip of the cylindrical portion may be arranged so that the roller cutter is offset so that the mountain portion of the locus excavated and formed by the rotation of the cutter body is cut by the next cutter body. Alternatively, a part of the roller cutter disposed at the tip of the cylindrical portion may be replaced with a cutter bit, and these cutter bits may also be maintained in a point symmetric state with respect to the center of the cylindrical portion. Also, by inserting a lid etc. into the cylindrical part,
It was decided to form a closed space inside which a supply of compressed air was received.

[0006]

Since the excavator according to the present invention has the above-mentioned structure, the excavator 6 with the cutter bit attached is used to excavate a hole, and when the efficiency of the excavator is reduced due to hitting a rock or the like, the roller cutter is It can be replaced with a drilling rig that fractures the bedrock by an installed shock. Since the roller cutter is point-symmetric with respect to the center of the cylindrical portion, the cylindrical portion can be rotated without losing its balance.
Also, a part of the roller cutter is used as a cutter bit,
It can also be applied to both soil and bedrock. Further, the compressed air supplied to the closed space in the cylindrical portion can be jetted from the tip of the device.

[0007]

1 to 3 show an example of a roller cutter 11 used in an excavating device 10 according to the present invention. A supporting portion 13 attached to the tip of a cylindrical portion 12 and an integrally projecting portion of the supporting portion 13. The shaft 14 is provided, and the cutter body 15 is rotatably attached to the shaft 14.

The cutter body 15 has a shape in which annular rings which are gradually thinned toward the outer periphery are overlapped with each other, and the outer periphery has a convex portion 1
6, concave portions 17 are alternately formed, and a cemented carbide tip 18 is embedded in the outer peripheral tip of the convex portion with a space protruding from the tip.

In the roller cutter 11, as shown in FIG. 4, the cutter body 15 rotates when the cylindrical portion 12 is rotationally driven at the tip of the cylindrical portion 12 in point symmetry with respect to the center of the cylindrical portion and is grounded. However, the cemented carbide tip 18 is attached so that an impact is applied. In this case, the mounting positions of the roller cutters 11 are alternately shifted, and as shown in FIG.
The excavated surface is formed to be flat by alternately displacing the protrusions 16 of the other cutter body so that the loci of the recesses 17 of the one cutter body come to the loci.

When the roller cutters 11 mounted on the cylindrical portion 12 of the excavator 10 are alternately displaced, as shown in FIG. 6, if the roller cutters 11 are mounted on the tip of the cylindrical portion 12 so as to alternately face in opposite directions, the appearance is improved. , It is possible to shift the rear roller cutter with respect to the trajectory of the front roller cutter.

The excavator 10 can be set in a hole excavated by the excavator 6 to which a conventionally used cutter bit is attached and can be exchanged for use, and a deep hole can be efficiently formed.

7 and 8 show another embodiment of the excavator according to the present invention, in which a cutter bit and a roller cutter are attached so that soil or rock can be excavated by the same device. Twenty.

The excavator 20 has a pair of roller cutters 11, 11 having different directions at the tip of the cylindrical portion 12, and these sets are attached with the cutter bit 2 in between. In addition, the roller cutters of the above-mentioned one set are attached such that the loci of the concave portions 17 of one cutter body are displaced so that the convex portions of the other cutter body pass through. The cutter bit 2 between each set is an inner blade bit 21 for cutting the inside, the center, and the outside,
A middle blade bit 22 and an outer blade bit 23 are provided. The roller cutter and various bits are point-symmetric with respect to the center C of the cylindrical portion.

The excavator 20 is provided with a cutter bit 2 and a roller cutter 11, and when excavating a hole and hitting the rock, the roller cutter acts and impacts and breaks the rock, so replace the device. Without
It is possible to drill deep holes efficiently.

The excavator of each of the above-mentioned embodiments excavates as shown in FIG. Inside the cylindrical portion 1, a lid 31 for forming a closed space 30 inside the cylindrical portion 1 is detachably provided. A compressed air supply line 32 is connected to the lid 31 to supply compressed air into the closed space 30. When compressed air is supplied into the closed space 30 by the supply line 32, the compressed air is ejected from the tip of the excavator and the dust generated by excavation is pushed out from the gap between the cylindrical portion 1 and the ground. Therefore, it is possible to continue excavation while smoothly discharging the powder by the so-called air blow effect of the compressed air. The lid 31 is configured to be attachable to and detachable from the cylindrical portion 1, and is removed as necessary to open the inside of the cylindrical portion 1, for example, when removing the residual soil in the cylindrical portion 1. Is able to.

The cutter body according to the present invention is provided at the tip of the case where the blow action of the compressed air is not used, that is, as shown in FIG. 10, there is no closed space inside the cylindrical portion and the inside is open. Of course, it is possible to exert an effective excavation capacity even in case of

[0017]

As described above, the excavator equipped with the roller cutter according to the present invention can be used interchangeably with the conventional excavator equipped with the cutter bit, so that the hole reaches the rock bed and excavates. If it becomes difficult to excavate, exchanging can be continued to efficiently continue excavation. Also, if you replace a part of the roller cutter with a cutter bit,
It can be applied to both soil and bedrock, and can more efficiently drill deep holes. Even in that case, since the roller cutter and each bit are point-symmetric with respect to the center of the cylindrical portion, even if the cylindrical body is rotationally driven, the balance is not lost. Furthermore, if the positions of the roller cutters are shifted, the excavated surface can be made uniform. In addition, by providing compressed air by providing a closed space in the cylindrical portion, the compressed air is ejected to the excavation portion at the tip of the roller cutter, and the air blow effect allows the powder to be efficiently discharged. Play.

[Brief description of drawings]

FIG. 1 is a rear view of a roller cutter according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram in which a roller cutter is attached to a lower end of a cylindrical portion.

4 is a view corresponding to a line IV arrow in FIG. 3 when the roller cutter is attached to the lower end of the cylindrical portion in the same direction.

FIG. 5 is a view in which a convex portion of another cutter main body overlaps a locus of a concave portion of the cutter main body.

FIG. 6 is a view corresponding to FIG. 4 showing the roller cutter facing in the opposite direction.

FIG. 7 is a view corresponding to FIG. 6 of a cylindrical portion to which a roller cutter and a cutter bit are attached.

8 is a view showing a diameter portion of a cylindrical portion at a roller cutter position which is point-symmetrical in FIG. 7;

FIG. 9 is a cross-sectional view of an excavator using the roller cutter according to the embodiment.

FIG. 10 is an explanatory view of a conventional excavator to which a cutter bit is attached.

[Explanation of symbols]

2 cutter bit 10 excavator 11 roller cutter 12 cylindrical portion 13 support portion 14 shaft 15 cutter body 16 convex portion 17 concave portion 18 carbide tip 20 excavator 21 inner blade bit 22 middle blade bit 23 outer blade bit 30 closed space 31 lid 32 Supply line

Claims (5)

[Claims] 1. A roller cutter composed of a shaft and a cutter body rotatably supported by the shaft is arranged along the tip of a cylindrical part which is rotationally driven, and is arranged point-symmetrically with respect to the center of the cylindrical part. An excavating device, wherein the cutter body of the roller cutter is configured to rotate when the roller cutter at the tip of the cylindrical part is brought into contact with the ground to rotate the cylindrical part. 2. The excavating device according to claim 1, wherein the roller cutters are arranged so as to be displaced so that a mountain portion of a locus formed by excavation by the rotation of the cutter body is scraped off by the next cutter body. 3. The roller cutter disposed at the tip of the cylindrical portion is partially replaced with a cutter bit, and these cutter bits are maintained in a point symmetric state with respect to the center of the cylindrical portion. Drilling rig. 4. The closed space for receiving the supply of compressed air is provided at the tip of the cylindrical portion, and the compressed air in the closed space is ejected from the cutter body to the outside. The excavator according to any one of 1 to 3. 5. The excavating device according to claim 4, wherein the closed space is formed between the cylindrical portion and a lid inserted inside the cylindrical portion.