KR20170051834A

KR20170051834A - Drilling bit

Info

Publication number: KR20170051834A
Application number: KR1020150153237A
Authority: KR
Inventors: 계진태; 김세현
Original assignee: (주)씨엔피텍
Priority date: 2015-11-02
Filing date: 2015-11-02
Publication date: 2017-05-12
Also published as: KR101759560B1

Abstract

The present invention relates to a bit for drilling, comprising: a bit head portion having a sharp-end drilling surface formed therein, a wing bit accommodation groove formed on an external diameter surface thereof, and a shaft portion formed on a rear end thereof; a wing bit having a body formed to longitudinally be long and shaft protrusions formed on opposite sides thereof, installed to be unfoldable or foldable near a sharp-end excavation side of the bit head portion in such a manner that the shaft protrusions are inserted along a guide groove formed on the wing bit accommodation groove of the bit head portion; and an external container member having an adhesion contact portion formed on one side thereof configured to contact and adhere to the wing bit having a margin groove portion formed on the other side thereof, and configured to allow the wing bit to be loosened. As such, the present invention is able to easily install a steel pipe using a foldable wing bit.

Description

Drilling bit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling bit, and more particularly, to a drilling bit capable of facilitating installation of a steel pipe.

Generally, the steel pipe grouting method is an underground excavation assist method that improves the water quality while reinforcing the ground. By installing the steel pipe on the ground and injecting the grout material into the inside of the steel pipe, the steel pipe and the ground are integrally It is characterized by increasing the soil and the shear strength of the rock mass. It is very advantageous in terms of workability and economical efficiency because the injection is performed in the steel pipe.

Such a steel pipe grouting method has been established and widely used as a tunnel reinforcement method in recognition of its effect.

Generally, a steel pipe grouting method includes a step of drilling a ground, a step of inserting a steel pipe provided with a strainer (grout reinjecting part) into a perforated hole, a step of putting a sealing material between the steel pipe and the perforation hole, While injecting cement.

However, since this method proceeds by inserting the steel pipe after the perforation, there is a problem that it is difficult to insert the steel pipe due to collapse of the perforation hole or mixing of foreign materials in the soft soil layer where the perforation hole is not naturally maintained.

In order to solve the above problems, a technique has been developed in which a steel pipe can be easily installed using a foldable wing bit as disclosed in Korean Patent Registration No. 100919628.

The conventional excavation bit is formed by inserting a pipe-shaped steel pipe by the bit body, advancing along the excavation progressing direction together with the bit body in a state where the wing bit is expanded by the excavation pressure, When the body is lifted, the wing bit is naturally folded by the load and can be pulled out to the outside while leaving the steel pipe. For example, when the rock is encountered during excavation, only the steel pipe is left in its place, I had no choice but to get out.

Therefore, in the related art, steel pipes can not be taken out in the process of excavation, and steel pipes are left untouched. In order to prevent this, separate steel pipe drawing equipment has to be mobilized.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drilling bit for drilling bits and steel pipes together as needed during drilling. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a drilling bit comprising: a bit head portion having an advanced excavation surface, a wing bit accommodating groove formed on an outer diameter surface thereof, and a shaft portion formed at a rear end thereof; Wherein the body is longitudinally elongated and axial protrusions are formed on both sides thereof and the shaft protrusion is inserted along a guide groove formed in the wing bit accommodating groove of the bit head portion so as to be spread and folded near the advanced excavation face of the bit head portion, A wing bit which is installed as much as possible; And a shaft receiving portion formed to receive the shaft portion of the bit head portion, the shaft rotatable at a first angle and a second angle with respect to the bit head portion, The wing bit is protruded outwardly of the bit head portion to maintain a unfolded state so as to be able to carry the steel pipe, and a tight contact portion which is brought into close contact with the wing bit is formed at one side thereof, And an outer tube member having a clearance groove for loosening the wing bit on the other side so that the wing bit can be freely folded and released from the steel pipe when the shaft is rotated at two angles.

According to another aspect of the present invention, there is provided a locking pin which penetrates the through hole of the outer barrel member and is engaged with the neck of the shaft portion so that the shaft portion of the bit head portion is not separated from the outer barrel member.

According to the present invention, the wing bit accommodating grooves are formed in the outer surface of the bit head portion, and are first accommodating grooves and second accommodating grooves that are equally arranged at 180 degrees, And an inner side surface of the second receiving groove may be elongated in the longitudinal direction from an inlet portion and have an end rounded.

According to the present invention, the bit head portion is inserted into the outer tube member so that the outer circumferential surface of the shaft portion is prevented from being separated from each other during rotation of the shaft, and the inner diameter surface The T-shaped engaging groove portion can be formed.

According to the present invention, the close contact portion is a flat surface formed on the front surface of the outer tub member, and the allowance groove portion may be a rectangular groove formed in a shape corresponding to the wing bit so that the wing bit is loosened.

According to the present invention, when the wing bit is rotated in the clockwise direction with respect to the axial direction, an inclined surface is formed in front of the body so as to facilitate excavation, a unidirectional curved surface is formed on one side of the tip, When the outer barrel member is rotated in the counterclockwise direction, a rounded surface may be formed at the rear end so that the clearance groove portion of the outer barrel member loosens the wing bit and folds in the axial direction.

According to some embodiments of the present invention as described above, since the bit can lift the steel pipe, the steel pipe can be transported, re-installed, recycled or the like as needed to improve the utilization and prevent waste of the steel pipe The efficiency of drilling work and the productivity can be improved. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view illustrating an excavation bit according to some embodiments of the present invention.
Fig. 2 is an exploded perspective view of the excavating bit shown in Fig. 1; Fig.
3 is a part exploded rear perspective view showing the excavating bit of Fig.
Fig. 4 is a perspective view showing the outer barrel member of the excavating bit of Fig. 1;
Fig. 5 is a cross-sectional view showing a steel pipe feeding state of the excavating bit of Fig. 1;
Fig. 6 is a cross-sectional view showing a state in which the excavating bit of Fig. 1 is separated from a steel pipe.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a perspective view showing a drill bit 100 in accordance with some embodiments of the present invention. 2 is a fragmentary exploded perspective view showing the excavating bit 100 of FIG. 1, and FIG. 3 is a part exploded rear perspective view showing the excavating bit 100 of FIG.

1 to 3, a drilling bit 100 according to some embodiments of the present invention includes a bit head portion 10, a wing bit 20, and an outer tube member 30, . &Lt; / RTI >

For example, the bit head portion 10 is a kind of metal block having a tip excavation surface 11, wing bit receiving grooves H1 and H2 formed on an outer diameter surface thereof, and a shaft portion 12 formed on a rear end thereof. .

More specifically, although not shown, semi-spherical cemented carbide tips may be installed on the advanced excavation surface 11 to facilitate excavation.

Further, the bit head portion 10 may be formed with, for example, a working fluid injection hole or a working fluid discharge groove. Accordingly, during excavation, a working fluid such as air or water is injected into the working fluid input hole to reduce friction or impact, and the excavated foreign matter can be easily discharged to the outside along the working fluid discharge groove. The number and shape of the working fluid inlet holes or the working fluid outlet grooves can vary widely.

1 to 3, the wing bit receiving grooves H1 and H2 are formed on the outer diameter surface of the bit head portion 10 and are formed in a first receiving groove H1) and a second receiving groove (H2), and the guide groove (G) is formed in the inner surface of the first receiving groove (H1) and the second receiving groove (H2) And the end portion Gb thereof may be rounded.

Accordingly, when the shaft protrusion 22 is inserted into the inlet portion Ga of the guide groove G and reaches the end portion Gb, the wing bit 20 facilitates the rotation when the wing bit 20 is opened and folded .

1 to 3, the wing bit 20 is formed such that a body 21 is elongated in the longitudinal direction, an axial projection 22 is formed on both sides thereof, and the axial projections 22 Is inserted along the guide groove G formed in the wing bit accommodating grooves H1 and H2 of the bit head portion 10 to be extended and extended in the vicinity of the advanced excavation face 11 of the bit head portion 10, Shaped metal block that can be folded.

Here, the number of the wing bits 20 is not limited to two, and a plurality of wing bits 20 may be provided, such as at least one, three, four, five, six.

In addition, the wing bit 20 may be formed with a wing bit excavation surface, and at least one carbide tip may be installed on the wing bit excavation surface.

2, the wing bit 20 has an inclined surface F1 formed in front of the body 21 so as to facilitate excavation when the wing bit 20 rotates clockwise with respect to the axial direction, When the outer barrel member 30 is rotated in the counterclockwise direction, the excess groove portion 32 of the outer barrel member 30 loosens the wing bit 20 A rounded surface F3 may be formed at the rear end so as to be folded in the axial direction.

Therefore, the wing bit 20 can be unfolded from the bit head portion 10 to transfer the steel pipe, and can be folded in the direction of the bit head portion 10 to be detached from the steel pipe.

4 is a perspective view showing the outer barrel member 30 of the excavating bit 100 of FIG.

1 to 4, the outer tube member 30 has a shaft receiving portion A formed therein so as to receive the shaft portion 12 of the bit head portion 10, The wing bit 20 is rotatable about the bit head 10 at a first angle and a second angle with respect to the bit 10, The bit head portion 10 is formed with a contact portion 31 which is in contact with the wing bit 20 at one side so as to be able to carry the steel pipe while maintaining the unfolded state, The wing bit 20 is freely folded so that the wing bit 20 is loosened on the other side so that the wing bit 20 can be released from the steel pipe. It may be a cylindrical metal block. Therefore, the outer barrel member 30 can be rotated forward and backward at a certain angle relative to the bit head portion 10.

2 and 4, the contact portion 31 of the outer barrel member 30 is two flat surfaces formed on the upper and lower portions of the front surface of the outer barrel member 30, The widening groove portion 32 is formed in a shape corresponding to the wing bit 20 so that the wing bit 20 can be loosened so that the two wing bits 20 are formed in the left and right portions of the front face of the outer barrel member 30, have.

The rear end of the wing bit 20 is brought into close contact with the close contact portion 31 so that the wing bit 20 can be unfolded And the rear end of the wing bit 20 is loosened due to the clearance groove portion 32 when the outer barrel member 30 is rotated in the reverse direction with respect to the bit head portion 10, The folded state of the wing bit 20 can be induced.

1 to 3, a through hole H of the outer barrel member 30 is formed so as to prevent the shaft portion 12 of the bit head portion 10 from being separated from the outer barrel member 30, And a latching pin P which is inserted into the neck portion 13 of the shaft portion 12 and is engaged therewith.

The bit head portion 10 is assembled to the outer cylinder member 30 and the neck portion 13 is engaged with the engaging pin P when the engaging pin P is fastened to the through hole H And can be rotated in the forward and reverse directions at the same time without being detached from the outer barrel member 30.

4, a latching protrusion 14 is formed on the outer diameter surface of the shaft portion 12 so that the bit head portion 10 is inserted into the outer barrel member 30 and is not separated from each other when the shaft is rotated. And a T-shaped latching groove T may be formed on an inner surface of the outer barrel member 30 so as to guide the latching protrusion 14.

Therefore, the latching protrusion 14 of the bit head 10 is inserted into the T-shaped latching groove T so that the T-shaped latching groove T is formed at a predetermined angle along the T- For example, only 45 degrees, within the region where it is formed. However, these angles are not limited and can be set to a wide variety.

FIG. 5 is a cross-sectional view showing a state in which the excavating bit 100 of FIG. 1 is conveyed to the steel pipe 1, and FIG. 6 is a sectional view showing the excavating bit 100 of FIG.

5 and 6, the operation of the excavating bit 100 according to some embodiments of the present invention will be described. First, as shown in FIG. 5, the outer barrel member 30 The contact portion 31 is brought into close contact with the wing bit 20 so that the wing bit 20 contacts the bit head portion 10 So that the steel pipe can be firmly carried while maintaining the unfolded state.

At this time, the wing bit 20 interferes with the close contact portion 31 and is not rotated any more, but is firmly coupled to the outer barrel member 30. For example, The contact portion 31 can be brought into close contact.

When the outer barrel member 30 rotates about the bit head 10 at a second angle with respect to the bit head portion 10, the clearance groove portion 32 loosens the wing bit 20, The wing bit 20 can be easily folded by an external force or a load of a steel pipe, and the bit head portion 10 can escape from the steel pipe.

At this time, the wing bit 20 is loosened by the excess groove portion 32 and can be easily rotated, and is spaced apart from the outer barrel member 30. For example, It is possible to freely rotate in the free groove portion 32. [

Therefore, according to the present invention, it is possible to lift the steel pipe by selectively binding the wing bit, and it is possible to carry, reinstall, and recycle the steel pipe as necessary to improve the utilization degree and to prevent waste of the steel pipe, Efficiency and productivity can be improved.

While the present invention has been described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims

A bit head portion having an advanced excavation surface, a wing bit accommodating groove formed on an outer diameter surface thereof, and a shaft portion formed at a rear end thereof;
Wherein the body is longitudinally elongated and axial protrusions are formed on both sides thereof and the shaft protrusion is inserted along a guide groove formed in the wing bit accommodating groove of the bit head portion so as to be spread and folded near the advanced excavation face of the bit head portion, A wing bit which is installed as much as possible; And
A shaft receiving portion is formed to receive the shaft portion of the bit head portion, a shaft rotatable at a first angle and a second angle with respect to the bit head portion, and a shaft rotatable at a first angle with respect to the bit head portion The wing bit is protruded outwardly of the bit head portion to maintain the unfolded state so that the wing bit can be brought into close contact with the wing bit so as to carry the steel pipe, An outer tube member having a clearance groove portion for loosening the wing bit on the other side so that the wing bit can freely be folded and escape from the steel pipe when the shaft is rotated at an angle;
And an excavation bit.

The method according to claim 1,
Wherein a locking pin is provided which penetrates through the through hole of the outer barrel member so that the shaft portion of the bit head portion is not separated from the outer barrel member and is engaged with the neck portion of the shaft portion.

The method according to claim 1,
Wherein the wing bit accommodating grooves are formed in the outer surface of the bit head portion and are first accommodating grooves and second accommodating grooves that are equally arranged at 180 degrees,
Wherein the guide groove is formed on the inner side surface of the first receiving groove and the second receiving groove so as to be elongated in the longitudinal direction from the entrance portion and has an end rounded.

The method according to claim 1,
A locking protrusion is formed on an outer diameter surface of the shaft portion so that the bit head is inserted into the outer barrel member and not separated from each other when the shaft rotates, and a T-shaped locking groove portion is formed on the inner diameter surface of the outer tube member so as to guide the locking protrusion Drilling bit

The method according to claim 1,
Wherein the close contact portion is a flat surface formed on a front surface of the outer tub member and the allowance groove portion is a rectangular groove formed in a shape corresponding to the wing bit so that the wing bit can be loosened.

The method according to claim 1,
Wherein the wing bit has an inclined surface formed in front of the body so as to facilitate excavation when the wing bit rotates in the clockwise direction with respect to the axial direction and a curved surface formed in one direction on one side of the tip, , Wherein a clearance surface is formed at the rear end so that the clearance groove portion of the outer barrel member loosens the wing bit and folds in the axial direction.