JP3287554B2 - Expanding and viscous film removal bit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bit for expanding diameter and removing a viscous film, and more particularly, to removing a viscous film on the inner surface of a hole formed in soil and expanding the diameter of the hole. The present invention relates to an enlarged diameter and viscous film removal bit.

[0002]

2. Description of the Related Art For example, as shown in FIG. 11, a ground anchor 1 is used for stabilizing a slope, reinforcing a retaining wall, stabilizing a pier, reinforcing a tunnel, reinforcing a suspension bridge, and preventing a steel tower from overturning. The ground anchor 1 is inserted into the support hole 3 formed in the ground and is fixed. The ground anchor 1 is filled with the grout 5 in the support hole 3, and the ground anchor 1 is formed by friction between the grout 5 and the inner surface of the support hole 3. It is fixed in the support hole 3. In particular, when the ground made of the mudstone layer is drilled, the drilling water may form a viscous soil-like viscous coating 7 on the inner surface of the support hole 3. When such a viscous coating 7 is formed on the inner surface of the support hole 3, the friction between the grout 5 and the inner surface of the support hole 3 becomes extremely small.
Are not fixed in the support holes 3. Therefore, in such a case, it is necessary to remove the viscous coating on the inner surface of the hole.

[0003] As a bit capable of removing the viscous film on the inner surface of a hole formed in the soil and expanding the diameter of the hole, the bit shown in FIG. 12 is already known. In this conventional bit, the rear ends 9a of a plurality of blades 9 are pivotally mounted around the bit body 8, and each blade is provided by a complicated opening / closing mechanism (not shown) provided inside the bit body 8. The body 9 is rotated outward with its rear end 9a as the center of rotation. When the conventional bit reaches a predetermined position in the hole, the opening / closing mechanism inside the bit body 8 is operated to rotate each wing-shaped body 9 outward and open, and the front end of each wing-shaped body 9 is opened. The bit body 8 is rotated while the bit 9b is in contact with the inner surface of the hole.

[0004]

However, the above-mentioned conventional bit has the following problems.

[0005] The above-mentioned conventional bit has a very complicated structure including an opening and closing mechanism for the wings, and is not easy to handle and extremely expensive.

Since the opening and closing mechanism of the wings is extremely complicated, the wings may not open smoothly. It is difficult to open the wings, especially when the bit is located on hard rock.

[0007] Since the wing-like body is designed to rotate outward with the rear end as the center of rotation, the wing-like body is rotated outward and the bit is advanced while rotating while being opened. It is not possible. That is, the above-mentioned conventional bit only cuts the inner surface of the hole while moving backward, but cannot cut the inner surface of the hole while moving the bit forward.

The present invention has been made to solve the above-mentioned problem in the above-mentioned bits.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides the following enlarged diameter and viscous film removing bit.

At least a pair of cutting blades are pivotally attached to the bit body so as to be rotatable inward and outward with respect to the bit body with one end of each cutting blade as a center of rotation. An enlarged diameter and viscous film removal bit provided with a spring means for urging, wherein the enlarged diameter and viscous film removal bit is inserted through a casing pipe and a drilling ring bit attached to a front end of the casing pipe. When each of the cutting blades is rotated outward and opened, the distance between the portion of each of the cutting blades farthest from the bit body is determined by the outer diameter of the casing pipe and the diameter of the ring bit for drilling. Larger than the outer diameter, and further, each of the cutting blades
When each cutting blade rotates outward and opens,
The front part of the part of the cutting blade farthest from the bit body
The rear part is forward and rear from the farthest part, respectively.
To the inside of the bit body toward
Then, while retracting the diameter expansion and viscous film removal bit,
Cutting the viscous coating on the inner surface of the hole into irregularities,
Expanding the hole while retracting the viscous coating removal bit,
While expanding the expanding and viscous coating removal bit,
Cutting viscous coatings into irregular shapes, as well as diameter expansion and viscosity
While advancing the film-removed bits enlarged child pores and noise
An enlarged diameter and a viscous film removal bit characterized by being able to do this .

In this specification including the claims, "front" means the depth direction of the hole into which the bit for expanding the diameter and removing the viscous film is inserted, and "rear" is the direction opposite to "front". Shall be referred to.

[0012]

[Effect] A bit for expanding the diameter and removing the viscous film (reference numeral 11 in FIG. 1)
Is removed by removing a viscous coating in the hole when drilling with a drilling ring bit (see reference numeral 15 in FIG. 1) attached to the front end of the casing pipe (see reference numeral 13 in FIG. 1). Used when expanding the hole.

That is, a rod (see reference numeral 17 in FIG. 1) is connected to the rear end of the bit for expanding and removing the viscous film, and each cutting blade of the bit for removing the diameter and the viscous film is appropriately fixed (see FIG. 1). The enlarged diameter and the viscous film removal bit are inserted into the rear end of the casing pipe while being pressed inward against the force of the spring means (see reference numeral 19). At this time, when the portion of each cutting blade farthest from the bit body enters the casing pipe, the pressing of each cutting blade by the fixing means is released. While the diameter expansion and viscous film removal bit passes through the inside of the casing pipe and the hole bit for drilling,
The cutting blade of the diameter expanding and viscous film removing bit is pressed inward against the force of the spring means by the inner surfaces of the casing pipe and the drilling ring bit (see FIG. 2). When the cutting blades of the diameter-enlarging and viscous-film-removing bit come out from the front end of the drill bit, each cutting blade is rotated outward by the force of the spring means and opened (see FIG. 3).

When each cutting blade of the enlarged diameter and viscous film removing bit is pivoted outward and opened, the distance between the portion of each cutting blade furthest from the bit body is determined by the outer diameter of the casing pipe and the cutting diameter. It becomes larger than the outer diameter of the ring bit for hole, and each cutting blade is in a state of projecting outward from the bit body as it were. In this state, if the bit for diameter expansion and removal of the viscous film is rotated and moved in the axial direction, the inner surface (hole wall) of the hole is cut into an uneven shape, and the viscous film on the inner surface of the hole is removed (FIGS. 7 and 7). 9). When the inner surface of the hole is cut into an uneven shape, the grout injected into the hole is more strongly fixed to the inner surface of the hole. Further, when the bit is rotated in a state in which the diameter-increasing and viscous film removing bit is not moved, or is rotated while moving at an extremely low speed in the axial direction, the hole is enlarged (see FIGS. 8 and 10).

[0015] Each cutting blade in the enlarged diameter and viscous film removal bit includes a front portion and a rear portion of the portion farthest from the bit main body of each cutting blade when each cutting blade is rotated outward and opened. Are inclined inwardly of the bit body from the farthest part toward the front and the rear, respectively. Therefore, the enlarged diameter and viscous film removal bit can be moved in any direction before and after rotating. That is, the bit for expanding and removing the viscous film can be retracted while rotating as shown in FIGS. 7 and 8, and can be advanced while rotating as shown in FIGS.

[0016]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. The reference numeral 11 indicates a bit for increasing the diameter and removing the viscous film. The enlarged diameter and viscous film removal bit 11 has at least one pair of cutting blades 2 on the bit body 21.
3 is pivotally attached to the bit main body 21 so as to be rotatable inward and outward with respect to one end 23a of each cutting blade 23 as a rotation center, and spring means 25 for constantly urging each cutting blade 23 outward. It is arranged. Reference numeral 27 denotes a chip attached to the cutting blade 23. Spring means 2
As 5, the coil spring is used as an example. A rod 17 is connected to the rear end of the bit 11 for removing the enlarged diameter and the viscous film. In the example shown in FIG. 1, the rod 17 is screwed to the rear end of the bit 11 for expanding and removing the viscous film.

The enlarged diameter and viscous film removing bit 11 is inserted through a casing pipe 13 and a ring bit 15 for drilling attached to a front end of the casing pipe 13. In the example shown, the drilling ring bit 15 is screwed to the front end of the casing pipe 13. Sign 1
9 shows that the cutting blades 23 of the enlarged diameter and viscous film removing bit 11 are inserted against the force of the spring means 25 when the enlarged diameter and viscous film removing bit 11 is inserted into the rear end of the casing pipe 13. Fixing means, such as a fixing ring, for temporarily pressing the fixing means.

A portion 23 of each cutting blade 23 farthest from the bit body 21 when each cutting blade 23 of the bit 11 for expanding and removing the viscous film is rotated outward and opened.
The distance between b and 23b is made larger than the outer diameter of the casing pipe 13 and the outer diameter of the ring bit 15 for drilling. See FIG.

When each of the cutting blades 23 is turned outwardly and opened, the respective cutting blades 23 have a front portion 23c of a portion 23b farthest from the bit body 21 in each of the cutting blades 23.
And the rear part 23d are the farthest parts 23b, respectively.
From the front to the rear and incline inward of the bit body 21. See FIG.

In the examples shown in FIGS. 1, 2, 3 and 5, each cutting blade 23 is pivotally connected to the bit body 21 via a separate shaft 29, 31 respectively.

In the cases shown in FIGS. 4 and 6, each cutting blade 23 is pivotally attached to the bit body 21 via a common shaft 33.

FIG. 7 shows a state in which the viscous film 43 on the inner surface of the hole 41 is cut into an uneven shape while the diameter expanding and viscous film removal bit 11 is retracted. Reference numeral 45 denotes unevenness formed on the inner surface of the hole 41.

FIG. 8 shows a state where the diameter of the hole 41 is expanded while the diameter expansion and viscous film removal bit 11 is retracted. Code 4
7 shows an enlarged diameter portion of the hole 41.

FIG. 9 shows a state in which the viscous film 43 on the inner surface of the hole 41 is cut into an uneven shape while the diameter-enlarging and viscous film removal bit 11 is advanced.

FIG. 10 shows an enlarged diameter and viscous film removing bit 11.
Shows a state in which the diameter of the hole 41 is expanded while moving forward.

[0026]

The present invention exhibits the following excellent effects.

The cutting blade of the bit for expanding and removing the viscous film is configured so that when the cutting blade comes out of the front end of the drill bit, it is turned outward by the force of the spring means and opened. It is. That is, the cutting blade is reliably opened. Further, since the structure of the bit for expanding the diameter and removing the viscous film is extremely simple, it can be provided at a very low cost.

[0028] Since the cutting blade is reliably opened, the bit for expanding the diameter and removing the viscous film can be used from a soft rock ground to a hard ground without any trouble.

The cutting blades of the enlarged diameter and viscous film removal bit are, when each cutting blade is rotated outward and opened, a front portion and a rear portion of the portion of each cutting blade farthest from the bit body. Are inclined inwardly of the bit body from the farthest part toward the front and the rear, respectively. Therefore, the enlarged diameter and viscous film removal bit can be moved in any direction before and after rotating. That is, the enlarged diameter and the viscous film removal bit can be moved backward while rotating, and can also be moved forward while rotating.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the relationship between a diameter expanding and viscous film removing bit according to the present invention, a casing pipe, and a ring bit for drilling.

FIG. 2 is another cross-sectional view showing the relationship between the diameter expanding and viscous film removing bit, the casing pipe, and the drilling ring bit.

FIG. 3 is yet another cross-sectional view showing the relationship between the diameter expanding and viscous film removal bit, the casing pipe, and the drilling ring bit.

FIG. 4 is a cross-sectional view showing another enlarged diameter and viscous film removing bit according to the present invention.

FIG. 5 is a sectional view of the enlarged diameter and viscous film removal bit shown in FIGS. 1 to 3;

FIG. 6 is a sectional view of the enlarged diameter and viscous film removal bit shown in FIG. 4;

FIG. 7 is a side view showing an example of a use state of the viscous film removing device.

FIG. 8 is a side view showing another example of a use state of the viscous film removing device.

FIG. 9 is a side view showing still another example of a use state of the viscous film removing device.

FIG. 10 is a side view showing still another example of a use state of the viscous film removing device.

FIG. 11 is a sectional view showing a support hole and a viscous film.

FIG. 12 is a side view showing a conventional bit.

[Description of Signs] 1 Ground anchor 3 Support hole 5 Grout 7 Viscous coating 8 Bit body 9 Blade body 9a Rear end 9b Front end 11 Enlarged diameter and viscous coating removal bit 13 Casing pipe 15 Drilling ring bit 17 Rod 19 Fixing means Reference Signs List 21 bit main body 23 cutting blade 23a one end 23b part farthest from bit main body 23c front part 23d rear part 25 spring means 27 tip 29 axis 31 axis 33 axis 41 hole 43 viscous coating 45 irregularity 47 enlarged part

Claims (1)

(57) [Claims] At least a pair of cutting blades are pivotally attached to a bit body so that the cutting blades can be freely rotated in and out of the bit body with one end of each cutting blade as a rotation center. A diameter-enlarged and viscous-film-removing bit provided with spring means for biasing the casing pipe, wherein the diameter-expanded and viscous-film-removal bit comprises a casing pipe and a drilling ring bit attached to a front end of the casing pipe. When the cutting blades are pivoted outward and open, the distance between the cutting blades farthest from the bit body is the outer diameter of the casing pipe and the ring for drilling. to be larger than the outer diameter of the bit, further, each of the cutting blades, open the cutting edge is rotated outwardly
When the cutting edge is farthest from the bit body
The front part and the rear part of the
Inward direction of the bit body from the part forward and backward
And the hole is removed while retracting the diameter expansion and viscous coating removal bit.
Cutting the viscous coating on the inner surface into irregular shapes, expanding diameter and viscosity
Expanding the hole while retracting the coating removal bit, expanding the diameter
Of the inner surface of the hole while advancing the viscous and viscous coating removal bit
Cutting the coating into irregular shapes, and expanding and viscous coating
Either expanding the hole while advancing the removal bit
A bit for expanding and removing a viscous film, wherein the bit can be formed.