JP3123333B2 - Drilling tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digging tool for digging a wall or the like in which a reinforcing bar, a steel plate, or the like is embedded.

[0002]

2. Description of the Related Art In a tunnel or the like, the surface of a tunnel obtained by excavating the ground is covered with a concrete wall having a reinforcing bar or an iron plate as a core, and the surface is further covered with concrete or the like to form a finished surface. There is. In such a tunnel or the like, if necessary, 10 to 20 years after completion, the wall is reinforced by driving a locking bolt or the like into the wall to prevent the collapse.

[0003] In this method, a hole having a diameter of about 4 to 10 cm is formed vertically from a wall surface of a tunnel or the like to the ground by using a drilling tool, and a lock bolt is inserted into the hole. The ground and the lock bolts are fixed by injecting mortar or the like between them to reinforce the wall surface.

FIG. 1 shows an example of a drilling tool used for forming a pore.
3 and 4. Reference numeral 1 denotes a cylindrical main body, and a screw portion 1a formed by threading a screw on the outer peripheral surface is formed on the base end side (the lower side in FIG. 3 ). On the other hand, the distal end side of the main body 1 is enlarged in diameter, and a plurality of blades 2 are provided at the distal end thereof.
It is planted along the circumferential direction. Further, a cutting edge 2 a is provided along a radial direction of the main body 1 at a ridge formed on a tip side of the blade body 2.

When the excavating tool is screwed into the tip of a steel pipe or the like via the screw portion 1a, and the steel pipe is rotated with the blade body 2 pressed vertically against the wall surface of the tunnel, the cutting edge 2a
The wall and ground of the tunnel are excavated by the rotational force and the pressing force (striking force) of the tunnel to form pores.

[0006]

In the above-mentioned conventional excavating tool, since the cutting edge 2a is provided along the radial direction of the main body 1, especially when excavating by the rotational force of the cutting edge 2a, the cutting edge is exclusively used. Excavation is performed as the blade 2a moves in a direction substantially perpendicular to the longitudinal direction. Therefore, in particular, when a reinforcing bar or an iron plate is buried in a wall surface during excavation, it becomes difficult to cut the reinforcing bar or the iron plate, and as a result, there is a problem that an excavation speed is reduced or further excavation becomes difficult. . The present invention has been made in view of the above circumstances, and it is an object of the present invention to obtain a drilling tool having high excavation performance for a wall or the like in which a reinforcing bar or an iron plate is embedded.

[0007]

In order to solve the above-mentioned problems, a drilling tool according to the present invention comprises a cylindrical body having a tip end provided with:
A plurality of kinds of blade planted in a zigzag manner along the circumferential direction of the body, the distal end side of the Katsuko those of the blade has a plurality of switching having a component along the tangential direction of the body The feature is that a blade is provided.

[0008]

In the excavating tool of the present invention, at the tip of the main body,
A plurality of kinds of blade planted in a zigzag manner along the circumferential direction of the body, the distal end side of the Katsuko those of the blade has a plurality of switching having a component along the tangential direction of the body A blade is provided. For this reason, even when cutting a reinforcing bar or an iron plate buried in a wall surface or the like during excavation, the blade bodies implanted in a staggered manner act like saw teeth, and along the tangential direction of the plurality of cutting blades . Cutting by the components is performed, and as a result, these reinforcing bars and iron plates can be easily cut.

[0009]

Embodiments of the present invention will be described below in more detail with reference to the drawings. 1 and 2 show a drilling tool according to a first embodiment of the present invention. On the base end side (the lower part in FIG. 1) of the main body 10 having a cylindrical shape, a screw portion 10a in which a screw is threaded on the outer peripheral surface is formed, while the front end side of the main body 10 is enlarged in diameter and its front end is formed. , A plurality of types of blade bodies 11 and 12 are implanted along the circumferential direction of the main body 10.

[0010] Here, the blade indicated by the reference numeral 11 is composed of a pair of blades which are asymmetrical left and right, and are staggered along the circumferential direction of the main body 10. Furthermore, these blades 11,
A plurality of cutting blades 11 a, 11 b, 11 c, 11 d, 1 having components along the tangential direction of the main body 10
1e, 12a, 12b, 12c, 12d, and 12e are provided, respectively.

Then, the excavation tool is screwed to the tip of the steel pipe or the like via the screw portion 10a, and the tip of the blade bodies 11 and 12 is pressed perpendicularly to the wall surface of a tunnel or the like, and the steel pipe is inserted in FIG. When rotated in the direction of the arrow X, the wall surface and the ground become the cutting blades 11a, 11b, 11c, 11d, 11e,
Excavation is performed by the rotational force and the pressing force (hitting force) of 12a, 12b, 12c, 12d, and 12e. As a result, a hole corresponding to the outer diameter of the tool is formed in the wall surface.

In particular, in the excavating tool of the present embodiment, a pair of blades 11 are implanted at the tip of the main body 10 in a staggered manner along the circumferential direction of the main body 10, and the tips of the blades 11, 12 are formed. On the side, a plurality of cutting blades 11a, 11b, 11c, 11d, 11e, having components along the tangential direction of the main body 10 are provided.
12a, 12b, 12c, 12d, and 12e are provided, respectively. Therefore, in the case of excavation by the rotational force of the blades 11, 12 in particular, the pair of blades 11 implanted in a staggered manner acts like saw teeth, and the cutting blades 11a, 11b, 1
1c, 11d, 11e, 12a, 12b, 12c, 12
Excavation is performed by the components along the tangential direction included in d and 12e.

Therefore, even when a reinforcing bar or an iron plate is buried in the wall surface, the reinforcing bar or the iron plate can be easily cut. In particular, when a grid-like reinforcing bar is buried in the wall surface, the reinforcing bar is
Although it is expected to contact the 1,12, as shown in Figure 2, cutting edge 11 provided on the plurality of kinds of blades 11 and 12
a, 11b, 11c, 11d, 11e, 12a, 12
Since b, 12c, 12d, and 12e have various angles, these cutting edges 11a, 11b, 11c, 11d, 11
Any one of e, 12a, 12b, 12c, 12d, and 12e always contacts the rebar at a vertical angle or an angle close thereto, and as a result, the rebar can be easily cut.

[0014]

As described above, according to the excavating tool of the present invention, even when a reinforcing bar or an iron plate is buried in the wall surface during excavation, it is possible to easily cut the reinforcing bar or the iron plate. As a result, an excellent effect of preventing a decrease in excavation efficiency due to the presence of the reinforcing bar or the iron plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view taken along line II of a drilling tool according to a first embodiment of the present invention.

FIG. 2 shows an arrow II of a drilling tool showing a first embodiment of the present invention.
It is a front view along.

FIG. 3 is a partial cross-sectional view taken along the line III-III of a drilling tool showing a conventional example.

FIG. 4 is a front view of a conventional excavation tool taken along an arrow IV .

[Description of Signs] 1,10 Main body 1a, 10a Screw portion 2, 11, 12 Blade body 2a, 11a, 11b, 11c, 11d, 11e, 12
a, 12b, 12c, 12d, 12e Cutting edge X Excavation rotation direction of tool

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Ishibashi 1528 Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Works (56) References U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21B 10/58 E21B 10/02 E21B 10/40

Claims (1)

(57) [Claims] The tip of the 1. A body having a cylindrical shape, having a plurality of kinds of blade planted in a zigzag manner along the circumferential direction of the body, the distal end side of the Katsuko these blade body, An excavating tool comprising a plurality of cutting blades having a component along a tangential direction of the main body.