KR20170044427A - Withdrawable hammer bit - Google Patents

Withdrawable hammer bit Download PDF

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Publication number
KR20170044427A
KR20170044427A KR1020150144100A KR20150144100A KR20170044427A KR 20170044427 A KR20170044427 A KR 20170044427A KR 1020150144100 A KR1020150144100 A KR 1020150144100A KR 20150144100 A KR20150144100 A KR 20150144100A KR 20170044427 A KR20170044427 A KR 20170044427A
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KR
South Korea
Prior art keywords
bit
wing
wing bit
housing
steel casing
Prior art date
Application number
KR1020150144100A
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Korean (ko)
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KR101745393B1 (en
Inventor
정순용
Original Assignee
정순용
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Priority to KR1020150144100A priority Critical patent/KR101745393B1/en
Publication of KR20170044427A publication Critical patent/KR20170044427A/en
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Publication of KR101745393B1 publication Critical patent/KR101745393B1/en

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/325—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being shifted by a spring mechanism
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits

Abstract

The hammer bit of the present invention is characterized in that the wing bit receiving groove 11 is formed at the front end portion so that the wing bit 20 can be inserted and joined and the space portion 14 in which the connecting means 30 is installed is formed And a fixed pin receiving hole 12 through which the fixing pin 41 is inserted and is seated. An injection port 13 which is a passage for water or air is formed through the longitudinal direction, A bit housing 10 provided with a discharge port 15 which is a passage for discharging the generated mica and slime to the outside and a cemented carbide tip 27 for crushing the ground or rock on the front end face , At least one wing bit (20) inserted into the wing bit receiving groove (11) of the bit housing and coupled to be rotatable around the hinge pin (43), and one end of the wing bit Is coupled with a fixing pin (41) fixed to the pin receiving hole (12), and the other end is coupled to the hinge pin (43) Includes connecting means (30).
The end of the body portion 21a of the wing bit is protruded outside the outer diameter of the bit housing. When the bit housing is retreated after the end of the bore, the end 21a of the body portion of the wing bit is engaged with the end of the steel casing end shoe 3 The wing bit is detached from the wing bit receiving groove and rotates about the hinge pin 43 so that the wing bit 20 passes through the steel casing and can be recovered.

Description

&Quot; Withdrawable hammer bit "

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hammer bit for ground drilling, and more particularly, to a hammer bit for recovering a ground hammer bit capable of recovering the entire hammer bit through the inside of a steel casing while retaining a steel casing for preventing break- will be.

The ground hammer bit is provided with driving force and pneumatic pressure from a ground excavator and punctures the soil and the rock layer by the rotational force and impact provided by the external force during the drilling operation.

In case of the actual ground drilling work, in order to prevent the drilling hole from collapsing during the work, it is often necessary to perform a drilling work while inserting a steel casing of a pipe type into the drilling hole. In this case, After the drilling is completed, all or part of the bits are recovered. A method in which a ring-shaped bit, commonly called a ring bit, is welded to the tip of a steel casing and the core bit is drilled together with a bit called a core bit and then only the core bit is recovered; Two methods of recovering the whole bit are used. In the method of recovering the whole bits, several terms such as a large bit, a recoverable bit and an extended recoverable bit are called, and several products have been developed. However, due to their respective structural characteristics and constraints, There is a big difference.

A technique relating to such a lightening bit is disclosed, for example, in Korean Patent No. 10-0461525 and No. 10-0871127.

In the case of No. 10-0871127, the magnifying beam is guided by a guide device struck by a pneumatic piston, a pilot bit located at the lower part of the guide device, and a bottom face of the non-magnifying frame at substantially the same plane as the leading end face of the pilot bit And includes a wing bit that slides in an upward sloping direction as the perforation starts to be changed into a diameter-increasing state. However, since the bottom surface of the wing bit is in contact with the bottom surface of the pilot bit and the bottom surface of the pilot bit simultaneously, the magnifying beam having the above-described structure has a disadvantage in that the drilling speed is very slow as well as causing extreme noise.

In the case of No. 10-0871127, a wing bit inserted into the bit housing so as to be sloped up and down is protruded out of the outer diameter of the bit housing, and the outer end of the wing bit is located within the outer diameter of the bit housing. Such a structure has a disadvantage in that the relative movement between the bit housing and the wing bit is excessively restricted, thereby causing a fear of malfunction under the environment of a large amount of foreign matter.

Korean Patent No. 10-0461525 Korean Patent No. 10-0871127

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ground hammer bit capable of easily separating a wing bit and recovering a wing bit through a steel casing after completion of a ground drilling using a steel casing. In particular, the hammer bit of the present invention provides a recoverable hammer bit that is easily applicable to tunnel reinforcement where a steel casing is indispensable and relatively small-diameter drilling is required.

In order to achieve the above object, in the hammer bit which is rotated by an external power source and is punched while advancing into the ground 1 or the rock with the steel casing 2, the wing bit 20 is inserted A wing bit accommodating groove 11 is formed at the front end so that the wing bit accommodating groove 11 can be coupled with the fixing pin 41 and the space portion 14 in which the connecting means 30 is installed is formed, A hole 12 is provided and an injection port 13 which is a passage for water or air is formed so as to penetrate in the longitudinal direction and the outer surface of which is formed by crushing the ground or rock, A bit housing (10) provided with a discharge port (15) as a passage for discharging; A cemented carbide tip (27) for crushing a ground or a rock on a front end face of the bit housing; at least one Of the wing bit 20; And a connecting means 30 located at the space portion and having one end coupled to a fixing pin 41 fixed to the fixing pin receiving hole 12 and the other end connected to the hinge pin 43, The end of the body portion 21a of the bit is protruded to the outside of the outer diameter of the bit housing and when the bit housing is retreated after the end of the bore, the end 21a of the body portion of the wing bit is hooked on the steel casing end shoe 3, Wherein the wing bit is completely or partially detached from the wing bit receiving groove and rotates about the hinge pin (43) so that the wing bit (20) can be recovered through the inside of the steel casing .

In this case, the wing bit accommodating groove 11 includes a body accommodating groove 11a into which the wing bit body 21 is inserted and an engaging portion accommodating groove 11b formed deeper to insert the wing bit engaging portion 22, (11b).

The wing bit is inserted into the body receiving groove 11a of the bit housing 10 and one end 21a of the wing bit body 21 protrudes outside the outer diameter of the bit housing. And a wing bit engaging part 22 which is integrally coupled to the wing bit body 21 and the other end 22b of which is inserted into the engaging part receiving groove 11b of the bit housing 10 .

The end 21a of the body portion of the wing bit is chamfered by chamfering an arc or a straight line on the outer side 23 of the engaging portion of the wing bit (one end of the wing bit of the engaging portion) The recovery operation can be performed more smoothly by allowing smooth rotation of the shoe 3 when it is rotated.

The connecting means is formed at one end thereof with a hinge pin receiving hole 33 coupled to a hinge pin 43 for connecting the wing bit so as to be rotatable, It is possible to constitute a rod-shaped connecting means in which a sliding guide 32 of a length is formed.

One end of the connecting means is formed with a hinge pin receiving ring 37 coupled to the hinge pin 43 and the other end is formed with a holding pin receiving ring 36 to be coupled to the holding pin 41, It is preferable that it is made of an elastic body capable of being elastically deformed by a certain length.

The fixing pin 41 is inserted into the fixing pin receiving hole 12 of the bit housing and both ends of the fixing pin 41 are restricted by the separate spring pin 42. [

It is preferable that the bit housing 10 or the wing bit 20 be formed with at least one transfer passage 18 or 24 so as to transfer water or air that has entered the injection port 13 of the bit housing 10 forward .

A through hole 17 is formed in the tip side surface of the bit housing and the penetrating pin 44 is inserted while the wing bit 20 is rotated so as to pass through the steel casing front end shoe 3, It is easy to mount the recoverable hammer bit on the steel casing.

A steel casing end shoe 3 having an inner diameter narrower than a steel casing is provided at the front end of the steel casing and a locking jaw 16 having an outer diameter larger than the inner diameter of the steel casing front end shoe 3 is provided in the bit housing 10, So that the steel casing can be easily installed together with the perforation.

Further, it is possible to provide two wing bits 20 coupled to one hinge pin 43, and the wing bit placement efficiency is improved in a hammer bit of a specific diameter.

The wing bit may further include an enlarged portion 26 formed so as to increase the width of the one end portion 21a of the body portion, thereby enhancing the perforation efficiency in the vicinity of the outer diameter of the steel casing.

The present invention relates to a hammer bit capable of being recovered through the inside of a steel casing after perforating the ground using a steel casing, and when the bit casing is retracted after the drilling is completed and the steel casing is left, the wing bit is rotated around the hinge pin, And the entire hammer bit can be recovered through the inside of the steel casing. That is, the entire hammer bit can be easily recovered by a simple operation of pulling the bit housing from the outside.

1 is a schematic view of a drilling operation using a steel casing and a hammer bit
Figure 2 shows a hammer bit recoil embodiment with one and two wing bits
Figure 3 is a cross-
4 is a flowchart showing the operation sequence of the recovery step
5 is a cross-sectional view of a wing bit embodiment of the present invention
Fig. 6 is a schematic view of a connecting means embodiment
FIG. 7 is a schematic diagram of a reclaimable hammer bit embodiment having three wing bits
8 shows an embodiment in which two wing bits are coupled to one hinge pin
9 is a cross-
Fig. 10 shows an embodiment in which the wing bit is temporarily fixed by the through-
Figure 11 shows an embodiment assembly with one asymmetric T-
Figure 12 shows an embodiment assembly with two asymmetric T-
Figure 13 shows an embodiment with two asymmetric T-

Preferred embodiments of the present invention will now be described with reference to the drawings.

1 is a schematic view showing a state in which a ground or a rock is pierced using a steel casing 2. The hammer bit 4 and the steel casing advance together while drilling the ground with a diameter equal to or larger than the outer diameter of the steel casing 2. The steel casing 2 prevents the crushing of the wall and temporarily or permanently leaves the hammer bit 4 after the end of the drilling to recover the ground, so that the steel casing 2 can be utilized according to the original purpose. Normally, the hammer bit 4 is advanced into the secured space by drilling the ground or the rock by an operation that rotates while pushing or hitting the ground by an external power source.

In the present invention, the hammer bit is rotatably rotated by an external power source and is easily recovered after perforating the steel casing 2 while advancing into the ground 1 or the rock. FIG. 2 is a perspective view of a preferred embodiment of the recoverable hammer bit of the present invention, wherein FIG. 2 (a) is an embodiment having one wing bit 20 and FIG. 2 (b) 20). 3 (A) and 3 (B) are sectional views of FIG. 2 (A) and FIG. 2 (B), respectively, showing the coupling relationship between the bit housing 10 and the wing bit 20. FIG. 4 is a view showing a process of collecting the wing bit 20 in the steel casing 2 by rotating the wing bit 20 by being caught by the steel casing front end shoe 3. 4A shows a state after the drilling operation is completed and FIG. 4B shows a state in which the wing bit 20 is partially rotated while being caught by the steel casing front end shoe 3 while the bit housing 10 is retracted 4 (c) shows a state in which the bit housing 20 is further retracted in the state of (b), and the wing bit 20 is fully inserted into the steel casing. 4 (c), when the bit housing is pulled out from the outside, the hammer bit including the wing bit 20 can be completely recovered through the inside of the steel casing 2.

The hammer bit of the present invention is formed with the wing bit receiving groove 11 at the front end portion so that the wing bit 20 can be inserted and joined and the space portion 14 in which the connecting means 30 is installed is formed And a fixing pin receiving hole 12 into which the fixing pin 41 is inserted and which is provided with an injection port 13 through which water or air is passed through in the longitudinal direction, A bit housing 10 having a discharge port 15 as a passage for discharging the generated mica and slime to the outside and a cemented carbide tip 27 for crushing a ground or a rock on a front end surface thereof, At least one wing bit (20) inserted into the wing bit receiving groove (11) of the bit housing and coupled to be rotatable about the hinge pin (43), and at least one wing bit (41) fixed to the hinge pin (12), and the other end is coupled to the hinge pin (43) The end of the body portion 21a of the wing bit is formed to protrude outside the outer diameter of the bit housing. When the bit housing is retreated after the end of the bore, The wing bit is completely or partially detached from the wing bit receiving groove and is rotated about the hinge pin 43 to pass the wing bit 20 through the inside of the steel casing, .

The wing bit accommodating groove 11 has a function of receiving the wing bit 20 and moving it integrally without separating from the bit housing 10 when drilling. It is a space. The fixing pin 41 has a function of fixing the other end of the connecting means 30 to the bit housing and the fixing pin receiving hole 12 has a function of receiving the fixing pin 41 at a predetermined position of the bit housing, Space. During the perforation, air or water is usually injected for smooth discharge of the slime caused by the breakage of the ground or the rock. The injection port 13 is injected from the outside into the space penetrating in the longitudinal direction of the bit housing 10 Air or water to the front of the bit housing. The space portion 14 is a part of the injection port 13 and corresponds to a space for accommodating the connecting means 30. A passage through which the photons generated during perforation is discharged is required, and a space formed outside the bit housing 10 corresponds to the discharge port 15.

The cemented carbide tip 27 is generally made of tungsten carbide and has a very high hardness and functions to directly crush the ground or the rock. The cemented carbide tip 27 must be provided in plurality on the front surface of the wing bit 20, It is advantageous to be provided on the front surface of the housing 10, but it may not be provided if the space is insufficient.

The hinge pin 43 is seated in the hinge pin receiving grooves 25 and 65 of the wing bit 20 and engages with one end of the connecting means 30 so that the wing bit 20 is not separated from the connecting means 30 do. The connecting means 30 has one end connected to the hinge pin 43 and the other end connected to the fixing pin 41 so that the bit housing 10 and the wing bit 20 are completely separated from each other, .

5 (a) to 5 (b) show a preferred embodiment of the wing bit according to the present invention in a sectional view. For convenience of explanation, the wing bit 20 is formed in a wing A bit body portion 21 and hinge pin receiving grooves 25 and 65 are provided and a wing bit fitting portion 22 having a function of being coupled to the bit housing 10 is divided. The wing bit body part 21 is divided into a body part end 21a and a body part step 21b extending from the outer periphery of the bit housing 20 so as to protrude outwardly from the body part, Is divided into a coupling end 22a and a coupling butt end 22b, which are connected to the body butt end 21b.

The wing bit accommodating groove 11 provided in the bit housing 10 has a body receiving groove 11a in which the wing bit body 21 is inserted and a wing bit receiving groove 11b in which the wing bit fitting 22 is inserted deeper And the engaging portion receiving groove 11b is formed to prevent the wing bit 20 from moving or being excessively moved during the drilling process.

The wing bit is inserted into the body receiving groove 11a of the bit housing 10 and one end 21a of the wing bit body 21 protrudes outside the outer diameter of the bit housing, Is integrally coupled to the wing bit body portion 21 and the other end portion 22b includes a wing bit fitting portion 22 inserted into the coupling portion receiving groove 11b of the bit housing 10, So that when the hammer bit is recovered, the one end portion 21a of the body portion is caught by the steel casing front end shoe 3 so as to rotate around the hinge pin 43. [ 9, the wing bit receiving grooves 11 are divided into a body receiving groove 11a and a receiving portion receiving groove 11b.

5A is an example in which the outer side 23 of the coupling part which is the side of the wing bit end part 21a of the coupling part is not chamfered. The wing bit engaging portion 22 is completely disengaged from the engaging portion receiving groove 11b and then rotated. 5 (B) and 5 (C) show an embodiment in which a part of the outer side 23 of the coupling portion is chamfered, and FIG. 5 (B) shows a straight line and FIG. The wing bit engaging portion 22 can not rotate immediately when the wing bit end portion 21a is caught by the steel casing front end shoe 3 in the recovery operation process and the engaging portion receiving groove 11b And then rotated. 5 (d) and 5 (e) show an example in which the whole of the outer side 23 of the coupling portion is chamfered. Fig. 5 (d) shows an example in which chamfering is performed with several straight lines And starts rotating immediately when the one end portion 21a is caught by the steel casing front end shoe 3. The degree of this chamfer can be selected and applied by the designer in consideration of the size of the perforated object and the perforated area. 5B shows an embodiment of the asymmetrical T-shaped bit 60 in which the outer side 23 of the coupling part is fully chamfered and the T-shaped body end 61a is engaged with the steel casing front end shoe 3, And the T-shaped body butadiene 61b on the opposite side thereof does not extend outwardly of the inner diameter of the bit housing 10. An embodiment of the wing bit as shown in Fig. 5 (bar) is also shown in Figs. 11 to 13. Fig.

The outer end 23 of the coupling part of the wing bit 20 and one end of the wing bit of the coupling part are chamfered or chamfered in an arc or a straight line so that the end 21a of the body part of the wing bit It is possible to rotate smoothly when it is caught by the steel casing front end shoe 3.

6 (a) and 6 (b) show the rod connecting means 31 and the elastic connecting means 35, which are embodiments of the connecting means 30 of the present invention, respectively. The rod connecting means 31 is formed with a hinge pin receiving hole 33 at one end thereof for receiving a hinge pin 43 and a sliding guide 32 To prevent complete departure of the wing bit 20, allowing the wing bit to partially disengage from the bit housing 10 for smooth operation during recovery. The elastic connecting means 35 of FIG. 6 (B) has a hinge pin receiving ring 37 which is coupled to the hinge pin 43 at one end and a fixing pin receiving ring 36 The wing bit 20 is formed of an elastic body capable of being elastically deformed by a predetermined length between one end and the other end so as to prevent the wing bit 20 from being completely separated from the bit housing 10, Allowing some disengagement from the housing. In particular, in the case of the elastic connecting means 35, the elasticity is controlled so that the wing bit 20 is coupled to the bit housing 10 with a certain force even during the punching operation, thereby preventing the excessive wobble of the wing bit or the undesired part of the wing bit. The directions of the fixing pin 41 and the hinge pin 43 may be parallel and may be orthogonal to each other in space as in the embodiment of Fig. 9, which can be arranged according to the designer's intention and in the embodiment of Fig. 6 Are expressed as parallel to each other.

The connecting means is formed at one end thereof with a hinge pin receiving hole 33 which is coupled to a hinge pin 43 connecting the wing bit so as to be rotatable and at the other end of which a fixing pin 41 is inserted A rod connection means in which the sliding guide 32 is formed is possible.

The connecting means is formed at one end thereof with a hinge pin receiving ring 37 to be coupled to the hinge pin 43 and at the other end with a holding pin receiving ring 36 to be coupled to the fixing pin 41 , And an elastic body capable of being elastically deformed by a predetermined length.

9, 11 and 12, the fixing pin 41 is inserted into the fixing pin receiving hole 12 of the bit housing, and both ends of the fixing pin 41 are restricted by a separate spring pin 42 can do. The fixing pin 41 can be fixed to the fixing pin receiving hole 12 of the bit housing 10 by a variety of methods such as a screw or an interference fit. The spring pin 42, which is easy to manufacture, It is preferable to fix the fixing pin to the fixing pin receiving hole by using the spring pin.

Air or water that has entered the injection port 13 of the bit housing 10 is moved to the front surface of the bit housing and discharges the photon through the discharge port 15. [ Therefore, it is preferable that the wing bit 20 or the bit housing 10 is provided with a transfer passage through which water or air introduced into the injection port 13 can be forwardly transferred. In FIGS. 7, 9, and 13, And a transmission passage 24 provided in the wing bit receiving groove 11 of the bit housing 10 is shown in Fig. These transfer passages 18 and 24 correspond to a space secured without clogging to smoothly transfer the air or water introduced into the injection port 13.

The bit housing 10 or the wing bit 20 is preferably formed with at least one transmission passage 18 or 24 so as to transmit water or air entering the inlet 13 of the bit housing 10 forward .

When mounting the hammer bit (4) of the present invention in the steel casing (2), the hammer bit must be inserted into the opposite side of the steel casing front end shoe (3). In this case, when the wing bit 20 is unfolded and the end portion 21a of the body part protrudes outside the outer diameter of the bit housing 10, it may be difficult to insert the wing bit 20. As shown in FIG. 10, It is easy to insert the hammer bit 4 into the steel casing 2 by temporarily fixing the rotation of the wing bit by inserting the through pin 44 into the through hole 17 provided in the casing 10.

A through hole 17 is formed in the tip side surface of the bit housing and the penetrating pin 44 is inserted while the wing bit 20 is rotated so as to pass through the steel casing front end shoe 3, Can be limited.

It is preferable to advance the steel casing with drilling with the hammer bit. The hammer bit and the steel casing can be propelled by external pushing, and the hammer bit can be moved forward by pulling the steel casing.

A steel casing end shoe 3 having a smaller inner diameter than a steel casing is provided at the front end of the steel casing 2 and a locking protrusion 16 having an outer diameter larger than the inner diameter of the steel casing front end shoe 3 is provided in the bit housing 10 So that the steel casing can be towed while the bit housing advances.

Figs. 8 to 10 show an embodiment in which two wing bits 20 are coupled to one hinge pin 43. Fig. In this case, the two wing bits do not necessarily have to be symmetrical. In particular, it may be preferable to arrange the carbide tips 27 asymmetrically considering the punching efficiency. It is also possible to enlarge the width of the wing bit body part end 21a to form an enlarged portion 26 to increase the arrangement of the cemented carbide tips 27 and to dispose a large number of carbide tips 27 It is advantageous. Although it is not shown in the drawings, it is of course possible to form the extended portion by enlarging the width of the body end portion 21a even in the embodiment in which one wing bit is provided on one hinge pin.

It is possible to have two wing bits 20 coupled to one hinge pin 43. Further, the wing bit may be further provided with an enlarged portion 26 formed so that a width of a body end portion 21a is widened.

FIGS. 12 and 13 show an embodiment in which two asymmetric T-shaped bits 60 are coupled to a single hinge pin, which again has characteristics similar to the embodiment of FIG.

The shape of the shank 50, which is the rear portion of the hammer bit, varies depending on the manner of providing the power. In the case of using the air hammer, the shoe 50a for the air hammer is required. When the hydraulic hammer is used, 50b, which are standardized according to the size of the air hammer or the standard of the rod that transmits the power, so that the designer can select and apply it according to the purpose.

The recovered hammer bit of the present invention is drilled to the extent of the outer diameter of the steel casing at the time of drilling, and the wing bit is separated by the simple operation of pulling the hammer bit from the outside while leaving the steel casing at the time of recovery, And can be easily recovered. Such a recoverable hammer bit can replace the existing rectangular ring bit, which is advantageous in that the tungsten alloy, which is a toxic substance, can be completely recovered from the paper.

1: ground 2: steel casing 3: steel casing end shoe
4: Hammer bit
10: bit housing
11: wing bit accommodating groove 11a: body accommodating groove 11b: engaging portion accommodating groove
12: Fixing pin receiving hole 13: Inlet port 14:
15: outlet 16: latching jaw 17: through-hole
18:
20: Wing beat
21: wing bit body part 21a: body part one end 21b:
22: wing bit engaging portion 22a: engaging portion end portion 22b: engaging butted portion
23: coupling part outer side 24: transmission passage 25: hinge pin receiving groove
26: Extension 27: Cemented carbide tip
30: Connection means
31: bar connecting means 32: sliding guide 33: hinge pin receiving hole
35: Elastic connecting means 36: Retaining pin receiving ring 37: Hinge pin receiving ring
41: fixing pin 42: spring pin 43: hinge pin
44: Through-pin
50: shank 50a: shank for air hammer 50b: shank for hydraulic hammer
60: Asymmetric T-shaped bit
61a: T-shaped body part one end 61b: T-shaped body butadiene
65: Hinge pin receiving groove

Claims (12)

A hammer bit which is rotated by an external power source and is punched while advancing into a ground or a rock with a steel casing,
A wing bit accommodating groove is formed at a front end of the wing bit so that the wing bit can be inserted and coupled to the wing bit accommodating hole, a space portion in which a connecting means is installed, A bit housing having an injection port formed to penetrate through a longitudinal direction of the transfer passage and having a discharge port which is a passage for discharging a photon generated by crushing a ground or a rock on an outer side;
At least one wing bit provided with a cemented carbide tip for crushing a ground or a rock on a front end face thereof, inserted into a wing bit receiving groove of the bit housing and coupled to be rotatable about a hinge pin;
Wherein one end of the wing bit is coupled to a fixing pin fixed to the fixing pin receiving hole and the other end is coupled to the hinge pin, When the bit housing is retracted after the end of the drilling, one end of the body portion of the wing bit is caught by the steel casing tip shoe so that the wing bit is totally or partially detached from the wing bit receiving groove and is rotated around the hinge pin So that the wing bit can be recovered through the interior of the steel casing.
The method according to claim 1,
Wherein the wing bit accommodating groove comprises a body accommodating groove into which the wing bit body is inserted and an engaging groove accommodating groove formed deeper to insert the wing bit engaging portion.
The method according to claim 1,
Wherein the wing bit is inserted into the body receiving groove of the bit housing and one end of the wing bit protrudes outside the outer diameter of the bit housing and one end of the wing bit body is integrally coupled to the wing bit body, And a wing bit engaging portion inserted into the engaging portion receiving groove of the bit housing.
The method according to claim 1,
Wherein the wing bit side or both sides of the wing bit are rounded in a arc or a straight line so that one end of the body portion of the wing bit is engaged with the steel casing tip shoe to enable smooth rotation.
The method according to claim 1,
The connecting means includes a hinge pin receiving hole formed at one end thereof to be coupled to a hinge pin for rotatably connecting the wing bit and a rod-shaped connecting means having a sliding guide having a predetermined length for inserting the fixing pin at the other end thereof. And the hammer bit is a reclaimed hammer bit.
The method according to claim 1,
The connecting means is constituted by an elastic body having a hinge pin receiving ring at one end thereof coupled to the hinge pin and a retaining pin receiving ring coupled at the other end to the fixing pin, Recoverable hammer bit.
The method according to claim 1,
Wherein the fixing pin is inserted into the fixing pin receiving hole of the bit housing and the both ends of the hammer bit are restricted by a separate spring pin.
The method according to claim 1,
Wherein the bit housing or the wing bit is formed with at least one transfer passage for transferring water or air that has entered through the injection port of the bit housing to the front of the bit.
The method according to claim 1,
Wherein a through hole is formed in a tip side surface of the bit housing, and a through pin is inserted in a state in which the wing bit is rotated so as to pass through a steel casing tip shoe, thereby limiting movement of the wing bit. .
The method according to claim 1,
A steel casing end shoe having a narrower inner diameter than the steel casing is provided at the front end of the steel casing, and a biting housing is provided with a hook having an outer diameter larger than the inner diameter of the steel casing front end shoe to pull the steel casing while advancing the bit housing. Recoverable hammer bit.
The method according to claim 1,
And two wing bits coupled to one hinge pin.
The method according to claim 1,
Wherein the wing bit further comprises an enlarged portion formed to widen the width of one end of the body portion.
KR1020150144100A 2015-10-15 2015-10-15 Withdrawable hammer bit KR101745393B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101961701B1 (en) * 2018-01-23 2019-07-17 (주)나다건설 Withdrawable drilling bit
KR20200109011A (en) * 2019-03-12 2020-09-22 정순용 Withdrawable drilling bit
KR20200109962A (en) * 2019-03-15 2020-09-23 (주)나다건설 Withdrawable drilling bit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5686280B2 (en) * 2010-09-30 2015-03-18 知勇 重盛 Cutting bit of ground cutting device
KR101464676B1 (en) * 2013-08-07 2014-11-27 (주)나다건설 separable bit for earth boring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101961701B1 (en) * 2018-01-23 2019-07-17 (주)나다건설 Withdrawable drilling bit
KR20200109011A (en) * 2019-03-12 2020-09-22 정순용 Withdrawable drilling bit
KR20200109962A (en) * 2019-03-15 2020-09-23 (주)나다건설 Withdrawable drilling bit
WO2020189981A1 (en) * 2019-03-15 2020-09-24 (주)나다건설 Recovery-type drilling bit

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