WO2017057716A1 - Outil de forage - Google Patents

Outil de forage Download PDF

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Publication number
WO2017057716A1
WO2017057716A1 PCT/JP2016/079098 JP2016079098W WO2017057716A1 WO 2017057716 A1 WO2017057716 A1 WO 2017057716A1 JP 2016079098 W JP2016079098 W JP 2016079098W WO 2017057716 A1 WO2017057716 A1 WO 2017057716A1
Authority
WO
WIPO (PCT)
Prior art keywords
axis
bit
contact surface
pilot bit
ring bit
Prior art date
Application number
PCT/JP2016/079098
Other languages
English (en)
Japanese (ja)
Inventor
田中　邦彦
中村　和由
Original Assignee
三菱マテリアル株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Publication of WO2017057716A1 publication Critical patent/WO2017057716A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable

Definitions

  • the present invention relates to an excavation tool for excavating an annular ring bit that is integrally attached to the outer periphery of a pilot bit that is rotated about an axis.
  • Patent Document 1 discloses that an annular ring bit is rotatable around the axis of the casing pipe at the tip of the cylindrical casing pipe and is locked to the tip of the axis in the axial direction. It has been proposed that a pilot bit (inner bit) is attached to the tip of a transmission member inserted into the casing pipe so as to be able to advance and retreat.
  • a second abutting portion capable of abutting toward the front end side in the axial direction is formed on the ring bit side abutting portion having an inner diameter smaller than that of the casing pipe side abutting portion. Further, the pilot bit can be engaged with the ring bit around the axis.
  • Such a drilling tool is provided with a pilot bit and a ring bit by applying a rotational force around the axis and a striking force and thrust toward the tip end in the axial direction from the drilling device and the hammer to the pilot bit via the transmission member. Rotate and advance integrally, and excavate rocks and the like with a hard excavation tip attached to the tip. Further, in the excavation hole excavated in this manner, the casing pipe whose casing pipe side contact portion is in contact with the first contact portion is advanced and inserted without rotation.
  • the pilot bit is pulled out of the casing pipe together with the transmission member and collected after the excavation is completed, so that the first and second contact portions of the pilot bit and the casing pipe can be reused.
  • the side contact portion and the ring bit side contact portion are tapered surfaces having a relatively large inclination angle with respect to the axis.
  • the ring bit attached to the casing pipe tip so as to be able to move forward and backward in the axial direction is slightly advanced within a predetermined range by the striking force applied from the first contact portion of the pilot bit to the ring bit side contact portion. And crush the bedrock.
  • an object of the present invention is to provide an excavation tool capable of suppressing the wear of the pilot bit.
  • one aspect of the present invention provides a circle around the outer periphery of a pilot bit that is rotated around an axis and receives a striking force toward the tip end in the axial direction.
  • An excavation tool in which an annular ring bit is detachably attached, the ring bit being rotatable about the axis at the tip of a cylindrical casing pipe centering on the axis, and the tip in the axial direction.
  • the outer peripheral surface of the pilot bit and the inner peripheral surface of the ring bit are provided with conical contact surfaces that can be brought into close contact with each other and gradually reduce in diameter toward the tip end in the axial direction.
  • the outer peripheral surface on the rear end side of the contact surface of the pilot bit and the inner peripheral surface of the casing pipe can be brought into contact with each other and gradually reduce in diameter toward the tip end in the axial direction.
  • a conical contact surface, and in a cross section along the axis, an inclination angle formed by the contact surface with respect to the axis is set smaller than an inclination angle formed by the contact surface with respect to the axis. It is characterized by being.
  • the striking force applied to the pilot bit is transmitted through the conical contact surface that is provided on the outer peripheral surface of the pilot bit and the inner peripheral surface of the ring bit and can contact each other.
  • the inclination angle formed by the contact surface with respect to the axis is such that the outer peripheral surface on the rear end side of the contact surface of the pilot bit and the inner peripheral surface of the casing pipe.
  • the contact angle between the contact surfaces is set to be smaller than the inclination angle of the conical contact surfaces that can be contacted with each other and gradually decrease in diameter toward the tip end side in the axial direction. It can be larger than the contact surfaces.
  • the first contact portion of the conventional pilot bit having a relatively large inclination angle and the ring bit side contact portion are not simply brought into contact with each other, but the contact surfaces are firmly adhered in this way,
  • the pilot bit and the ring bit can be integrated without loosening, and the energy of the striking force can be efficiently transmitted to the ring bit via these contact surfaces.
  • the repulsive force does not act on the pilot bit from the ring bit, and wear of the pilot bit can be suppressed. Therefore, even in excavation using a high-frequency hammer, it is possible to efficiently excavate and extend the life of the pilot bit.
  • the thrust and striking force applied to the pilot bit are also transmitted to the casing pipe via the abutment surface, so that the casing pipe is integrated with the ring bit in the same manner as the excavation tool described in Patent Document 1.
  • the casing pipe can be inserted into the excavation hole by being advanced. However, since the casing pipe is inserted into the drilling hole for the purpose of protecting the drilling hole from collapsing, it is not necessary to rotate with the pilot bit like the ring bit.
  • the inclination angle formed by the contact surface with respect to the axis in the cross section along the axis is set larger than the inclination angle formed by the contact surface. They are not integrated, and therefore no unnecessary rotational force is generated.
  • an inclination angle formed with respect to the axis in the cross section along the axis is set to be less than 45 °.
  • the angle formed by the conical contact surface in the cross section along the axis is an acute angle of less than 90 °, so that the contact strength in the radial direction of the contact surface can be further ensured. Can be secured.
  • the inclination angle formed by the contact surface with respect to the axis in the section along the axis is set within a range of 6 ° to 20 ° even if it is less than 45 °. If the inclination angle exceeds 20 °, the ring bit may come off from the outer periphery of the pilot bit even if it is less than 45 °, and if the inclination angle is less than 6 °, the pilot bit is recovered. Therefore, it may be difficult to pull out from the ring bit.
  • pilot bit and the ring bit as described above, it is possible to transmit the rotational force applied to the pilot bit as it is to the ring bit and to rotate it integrally around the axis.
  • the ring bit may slip with respect to the rotational direction only by the close contact between the contact surfaces as described above, the outer surface of the pilot bit and the inner surface of the ring bit are in contact with each other.
  • the pilot bit and the ring bit are formed without damaging the contact area of the contact surface by forming a protrusion and a groove that extend in the axial direction and fit to each other at a position apart from the surface in the axial direction. It becomes possible to rotate integrally.
  • the present invention it is possible to maintain the transmission efficiency of the striking energy from the pilot bit to the ring bit and suppress the wear of the pilot bit, especially in excavation using a hammer for high frequency, While improving the excavation efficiency and extending the life of the pilot bit, the casing pipe can be inserted into the excavation hole without requiring unnecessary rotational force.
  • FIG. 6 It is a perspective view which shows the pilot bit and ring bit in one Embodiment of this invention. It is a front view of embodiment shown in FIG. It is ZZ sectional drawing in FIG. It is a front view of the pilot bit of embodiment shown in FIG. It is ZZ sectional drawing in FIG. It is a front view of the ring bit of embodiment shown in FIG. It is a partially broken side view of the ring bit shown in FIG. 6 and a casing top.
  • the pilot bit 1 has a bottomed, generally multi-stage cylindrical shape centered on the axis O whose front end side in the axis O direction (the left side in FIGS. 3 and 5) is made one step larger in diameter by a metal material such as steel.
  • the rear end portion of the small diameter is a shank portion 1A in which a male screw portion to which a high frequency hammer (not shown) is attached is formed on the outer periphery.
  • the tip end portion of the pilot bit 1 on the tip side of the shank portion 1A is formed so as to reduce the diameter in three steps toward the tip side.
  • the conical pilot bit side contact with the axis O gradually decreasing in diameter toward the tip end in the direction of the axis O is provided between the rearmost large diameter portion 1B and the next medium diameter portion 1C.
  • a contact bit 2 is formed, and a conical surface-shaped pilot bit with the axis O gradually decreasing in diameter toward the front end side in the axis O direction between the medium diameter portion 1C and the most advanced small diameter portion 1D.
  • a side contact surface 3 is formed.
  • the pilot bit side contact surface 3 is in relation to the axis O with respect to the inclination angle ⁇ formed by the pilot bit side contact surface 2 with respect to the axis O in the cross section along the axis O.
  • the tilt angle ⁇ to be constructed is set small.
  • the pilot bit side contact surface 2 has a length A in the direction parallel to the axis O and is directed to the tip side in the direction of the axis O by this length A. It is formed so as to be less than the radius B which is sometimes reduced in diameter, that is, formed so that the inclination angle ⁇ formed with respect to the axis O is 45 ° or more.
  • the contact surface 3 on the pilot bit side 3 Is formed such that the length C in the direction parallel to the axis O is longer than the radius D that is reduced in diameter when the length C is directed to the front end side in the axis O direction.
  • the tilt angle ⁇ formed is less than 45 °.
  • the length C of the pilot bit side contact surface 3 is sufficiently longer than the length B of the pilot bit side contact surface 2, and the radius D of the pilot bit side contact surface 3 is equal to the pilot bit side contact surface. It is set to be slightly larger than the radius B of the surface 2.
  • the outer peripheral surfaces of the large-diameter portion 1B, the medium-diameter portion 1C, and the small-diameter portion 1D are respectively cylindrical surfaces having a constant outer diameter centered on the axis O, and of these, the axis O of the medium-diameter portion 1C. The length in the direction is set slightly longer than the large diameter portion 1B and the small diameter portion 1D.
  • a plurality of (four in this embodiment) discharge grooves 4 are provided at equal intervals in the circumferential direction on the outer periphery of the front end of the pilot bit 1 from the front end surface of the pilot bit 1 to the rear end surface of the front end. Is formed.
  • These discharge grooves 4 are for discharging the dust (drilling waste) generated by excavation, and have a U-shape that opens to the outer peripheral side in a cross section perpendicular to the axis O, and a bottom surface 4A facing the outer peripheral side. As shown in FIG. 5, it is inclined to the outer peripheral side as it goes to the rear end side.
  • the ejection grooves 5 are respectively formed from the opening of the discharge groove 4 to the front end surface of the pilot bit 1 to a position spaced apart from the axis O toward the inner peripheral side.
  • an ejection hole 6A extending from the bottom surface so as to open to the ejection groove 5 is formed and discharged from the hammer. Compressed air or the like is ejected from the ejection hole 6A, and the dust is guided from the ejection groove 5 to the discharge groove 4 and discharged to the rear end side of the pilot bit 1.
  • An inclined outer peripheral gauge surface is formed.
  • a drilling tip 7 made of a cemented carbide harder than the pilot bit 1 is implanted in the face surface and the gauge surface perpendicularly to the face surface and the gauge surface so as to avoid the ejection groove 5. .
  • an arcuate plate-like ridge portion 8 that protrudes to the outer peripheral side is separated from the pilot bit side contact surface 3 to the tip side with a slight gap.
  • a plurality of strips are formed at equal intervals in the circumferential direction so as to extend in the direction of the axis O.
  • these protrusions 8 extend from one end in the circumferential direction of the discharge groove 4 (the end in the counterclockwise direction when viewed from the front as shown in FIGS. 2 and 4).
  • the excavation tip 7 is planted over the protruding portion 8.
  • the ejection hole 6B is formed in the outer periphery of the front-end
  • annular (cylindrical) ring bit 9 as shown in FIGS. 6 and 7 is detachably attached to the outer periphery of such a pilot bit 1.
  • the ring bit 9 is also formed of a metal material such as steel around the axis O, and the inner peripheral surface of the rear end thereof is a cone centered on the axis O that gradually decreases in diameter toward the tip side in the direction of the axis O.
  • a planar ring bit side contact surface 10 is formed.
  • the ring bit side contact surface 10 has an inclination angle ⁇ equal to that of the pilot bit side contact surface 3 with respect to the axis O in the cross section along the axis O, that is, the same as the pilot bit side contact surface 3.
  • a length C in a direction parallel to the axis O is formed so as to be longer than a radius D that is reduced in diameter when the length C is directed toward the tip side in the axis O direction, and is 45 ° with respect to the axis O. It is formed so as to form an inclination angle ⁇ of less than Therefore, the ring bit 9 has the ring bit side contact surface 10 in close contact with the pilot bit side contact surface 3 as shown in FIG. Attach to the end.
  • the inner peripheral surface of the tip portion of the ring bit 9 has an inner diameter slightly larger than the small-diameter portion 1D of the pilot bit 1, and the projecting portion of the pilot bit 1 is formed on the inner peripheral surface of the tip portion.
  • the groove portions 11 slightly wider in the circumferential direction than the number 8 penetrate the ring bit side contact surface 10 from the front end surface of the ring bit 9 in the axis O direction at the same number as the protrusions 8 at equal intervals in the circumferential direction.
  • the protrusions 8 can be fitted to each other.
  • the front end surface of the ring bit 9 also includes an inner peripheral face surface perpendicular to the axis O, and an outer peripheral gauge surface that inclines toward the outer peripheral side toward the rear end side.
  • a drilling tip 7 made of a cemented carbide harder than the ring bit 9 is vertically implanted on the gauge surface.
  • a concave groove 9A is formed on the outer peripheral surface of the tip of the ring bit 9 between the excavation tips 7 planted on the gauge surface (not shown in FIG. 1).
  • the ring bit side locking groove that opens in a “U” shape on the outer peripheral side at a position spaced in the direction of the axis O from the gauge surface and the rear end surface of the front end surface 12A is formed over the entire circumference.
  • the outer peripheral portion of the ring bit 9 on the rear end side of the ring bit side locking groove 12A is an annular ring bit side locking portion 12B protruding to the outer peripheral side with respect to the ring bit side locking groove 12A.
  • the outer diameter of the ring bit 9 is smaller than the tip of the ring bit 9, and the length in the direction of the axis O is set to be shorter than the ring bit side locking groove 12A.
  • the rear end outer peripheral portion of the ring bit side locking portion 12B is chamfered.
  • a cylindrical casing pipe 13 centering on the axis O is disposed on the outer periphery of the pilot bit 1 to which the ring bit 9 is attached as described above.
  • the casing pipe 13 is formed by integrally joining a cylindrical casing top 13B centering on the axis O to a tip portion of such a cylindrical pipe body 13A by welding or the like.
  • 13A has an inner diameter larger than the outer diameter of the large-diameter portion 1B of the pilot bit 1, and a plurality of pipe bodies 13A are successively added to the rear end side by welding or the like in accordance with the depth of the excavation hole. .
  • the casing top 13B is formed so that the outer diameter of the rear end portion thereof is one step smaller than that of the tip end portion, and the tip end portion of the most advanced pipe body 13A is fitted and joined to the stepped portion. Further, the inner diameter of the rear end portion of the casing top 13B is set to be slightly smaller than the outer diameter of the large diameter portion 1B of the pilot bit 1 and slightly larger than the outer diameter of the medium diameter portion 1C.
  • a casing pipe that can be brought into contact with the pilot bit side contact surface 2 formed at the rear end side of the pilot bit side contact surface 3 of the pilot bit 1 is provided at the inner peripheral portion of the rear end surface of the casing top 13B.
  • a side contact surface 14 is formed.
  • the casing pipe side contact surface 14 is also formed in a conical surface shape with the axis O gradually decreasing in diameter toward the tip end side in the axis O direction, and along the axis O as shown in FIG.
  • the inclination angle ⁇ formed with respect to the axis O is equal to the inclination angle ⁇ of the pilot bit side contact surface 2 and is larger than the inclination angle ⁇ formed between the pilot bit side contact surface 3 and the ring bit side contact surface 10. It is an angle.
  • the length A in the direction parallel to the axis O in the cross section along the axis O of the casing pipe side contact surface 14 is directed to the tip side in the axis O direction by this length A.
  • the inclination angle ⁇ is set to 45 ° or more.
  • the outer diameter of the tip portion of the casing top 13B is set equal to the outer diameter of the pipe body 13A and is set smaller than the outer diameter of the tip portion serving as the maximum outer diameter of the ring bit 9.
  • a casing pipe side locking groove 15A that opens in a “U” shape on the inner peripheral side in order toward the front end side in the inner peripheral portion of the tip of the casing top 13B, and the casing pipe side locking groove 15A.
  • a casing pipe side locking portion 15B protruding to the inner peripheral side is formed over the entire periphery.
  • the casing pipe side locking groove 15A and the casing pipe side locking portion 15B are set to have the same length in the axis O direction as the ring bit side locking groove 12A and the ring bit side locking portion 12B.
  • the inner diameter of the stop groove 15A is set to be slightly larger than the outer diameter of the ring bit side locking portion 12B.
  • the inner diameter of the casing pipe side locking portion 15B is set to be slightly larger than the outer diameter of the ring bit side locking groove 12A and smaller than the outer diameter of the ring bit side locking portion 12B. Has been chamfered.
  • the ring bit 9 accommodates the casing pipe side locking portion 15B in the ring bit side locking groove 12A, and the ring bit side locking portion 12B is connected to the casing pipe side locking groove 15A.
  • And can be rotated around the axis O, and is also locked to the front end side and the rear end side in the direction of the axis O in a range where the ring bit side locking groove 12A and the casing pipe side locking groove 15A are formed. It is attached.
  • the chamfered portions of the rear end outer peripheral portion of the ring bit side locking portion 12B and the tip inner peripheral portion of the casing pipe side locking portion 15B are mutually connected.
  • the rear end portion of the ring bit 9 is elastically reduced in diameter and the front end portion of the casing top 13B is elastic.
  • the casing pipe side locking portion 15B and the ring bit side locking portion 12B may be accommodated in the ring pipe side locking groove 12A and the casing pipe side locking groove 15A, respectively.
  • the pilot bit 1 After attaching the ring bit 9 to the casing top 13B at the front end of the casing pipe 13 in this way, the pilot bit 1 is fitted into the casing pipe 13 from the rear end side, and the protruding portion 8 is fitted into the groove 11 of the ring bit 9. It is inserted through a transmission member such as an excavating rod together with the hammer with the circumferential position adjusted so as to be combined. The transmission member is also sequentially added and connected according to the depth of the excavation hole, and the rearmost transmission member is connected to the excavator for high frequency.
  • the pilot bit 1 thus inserted into the casing pipe 13 is positioned when the pilot bit side contact surface 2 contacts the casing pipe side contact surface 14 of the casing top 13B.
  • the pilot bit 1 and the tip of the ring bit 9 are brought into contact with a rock or the like to give the pilot bit 1 a rotational force around the axis O and a thrust toward the tip in the axis O direction from the excavator.
  • excavation is performed by applying a high-frequency striking force from the hammer, the ring bit 9 is pressed against the rear end side by resistance from the rock or the like, and the ring bit side contact surface 10 is brought into contact with the pilot bit side contact surface 3 In close contact.
  • the ring bit 9 may be pressed to the rear end side before excavation so that the ring bit side contact surface 10 is in close contact with the pilot bit side contact surface 3.
  • the ring bit side latching portion 12B and the casing pipe side latching portion 15B are configured such that the pilot bit side contact surface 2 contacts the casing pipe side contact surface 14 and the ring bit side contact surface 10 functions as the pilot bit.
  • the casing pipe side locking groove 15 ⁇ / b> A and the ring bit side locking groove 12 ⁇ / b> A are disposed at positions spaced from both ends in the axis O direction. It is formed as follows.
  • the striking force and thrust force applied to the pilot bit 1 in the direction of the axis O direction are applied to the casing pipe 13 from the pilot bit side contact surface 2 to the casing pipe side contact surface of the casing top 13B. 14, and is transmitted to the ring bit 9 from the pilot bit side contact surface 3 to the ring bit side contact surface 10, and excavated by the drill bit 7 and the excavation tip 7 planted on the tip surface of the ring bit 9.
  • a hole is formed, and the casing pipe 13 is inserted into the excavation hole.
  • the rotational force about the axis O applied to the pilot bit 1 is also transmitted from the pilot bit side contact surface 3 to the ring bit 9 via the ring bit side contact surface 10.
  • the inclination angle ⁇ formed by the pilot bit side contact surface 3 and the ring bit side contact surface 10 with respect to the axis O is the pilot bit side contact surface. 2 and the casing pipe side contact surface 14 are set to be larger than the inclination angle ⁇ formed with respect to the axis O, so that the adhesion strength between the pilot bit side contact surface 3 and the ring bit side contact surface 10 can be increased. it can. Therefore, since the pilot bit 1 and the ring bit 9 can be integrated without loosening, energy by hitting at a particularly high frequency can be transmitted efficiently, and excavation efficiency can be improved.
  • pilot bit 1 and the ring bit 9 are firmly integrated in this way, the pilot bit 1 and the ring bit 9 are not repelled by the striking force. It is also possible to suppress the occurrence of wear. For this reason, since the life of the pilot bit 1 can be extended, the pilot bit 1 after excavation has been completed can be reliably reused by pulling it out of the casing pipe 13 together with the hammer and the transmission member.
  • the ring bit 9 is attached to the tip of a cylindrical casing pipe 13 disposed on the outer periphery of the pilot bit 1 so as to be rotatable and locked to the tip in the axial direction. Even if the ring bit 9 is detached from the pilot bit 1, it does not fall into the drilling hole, and the pilot bit 1 is advanced as it is so that the pilot bit side contact surface 3 and the ring bit side contact surface 10 are brought into close contact with each other for excavation.
  • the casing pipe 13 can prevent the formed excavation hole from collapsing while being able to resume. Further, in the present embodiment, the ring bit 9 is also locked by the casing pipe 13 on the rear end side in the axis O direction, so that the pilot bit 1 can be easily pulled out from the ring bit 9.
  • pilot bit side contact surface 2 of the pilot bit 1 and the casing pipe side contact surface 14 of the casing top 13B of the casing pipe 13 are inclined with respect to the axis O in a cross section along the axis O. Is set to an angle larger than the inclination angle ⁇ . Therefore, the pilot bit side contact surface 2 and the casing pipe side contact surface 14 do not come into close contact with each other like the pilot bit side contact surface 3 and the ring bit side contact surface 10, and the casing pipe 13 does not come into contact with the pilot bit. Since it does not rotate integrally with 1, more efficient excavation can be promoted without requiring unnecessary rotational force.
  • the pilot The bit side contact surface 3 and the ring bit side contact surface 10 are formed so as to be longer than the radius D at which the diameter is reduced, that is, the inclination angle ⁇ formed with respect to the axis O is set to be less than 45 °. Accordingly, since the angle formed by the pilot bit side contact surface 3 and the ring bit side contact surface 10 itself in the cross section along the axis O is an acute angle of less than 90 °, the adhesion strength can be improved more reliably.
  • the inclination angle ⁇ is set within a range of 6 ° to 20 °. If the inclination angle ⁇ exceeds 20 °, the ring bit 9 is detached from the pilot bit 1 by the striking force and the efficient transmission of energy is inhibited, or the repulsive force of the ring bit 9 acts on the pilot bit 1 and wears out. On the other hand, if the inclination angle ⁇ is less than 6 °, the pilot bit 1 and the ring bit 9 are too tightly integrated, and it is difficult to extract the pilot bit 1 from the ring bit 9 in order to collect the pilot bit 1. Or in some cases it may not be collected.
  • the pilot bit side contact surface 2 and the casing pipe side contact surface 14 have a length A in the direction parallel to the axis O, which is the length A toward the tip end side in the axis O direction.
  • the inclination angle ⁇ formed with respect to the axis O is set to be 45 ° or more. That is, the angle formed by the pilot bit side contact surface 2 and the casing pipe side contact surface 14 itself in the cross section along the axis O is a right angle or an obtuse angle of 90 ° or more. Therefore, it is possible to apply the striking force and thrust to the casing pipe 13.
  • the rotational force applied to the pilot bit 1 as described above is also transmitted from the pilot bit side contact surface 3 via the ring bit side contact surface 10. 9 is transmitted.
  • only contact between the pilot bit side contact surface 3 and the ring bit side contact surface 10 having a conical surface may cause the ring bit 9 to slip in the circumferential direction due to resistance from a rock or the like, and may cause detachment.
  • the pilot bit 1 may be worn.
  • a protrusion 8 and a groove 11 that extend in the direction of the axis O and fit each other are formed. Since the rotational force can be transmitted also through the protruding portion 8 and the concave groove portion 11, the ring bit 9 can be prevented from slipping.
  • the protrusion 8 and the groove 11 are separated from the pilot bit side contact surface 3 and the ring bit side contact surface 10 in the direction of the axis O to form the pilot bit side contact surface 3.
  • pilot bit 1 Since the pilot bit 1 is not formed on the small-diameter portion 1D of the pilot bit 1 or the ring bit tip contact surface 10 where the ring bit side contact surface 10 is not formed, the pilot bit side contact surface 3 or the ring bit side contact surface 10 The contact area does not decrease.
  • drilling efficiency can be improved and pilot bit wear can be reduced.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

Selon l'invention, un trépan annulaire (9) est monté amovible sur la circonférence externe d'un trépan pilote (1) qui tourne autour d'un axe (O) et reçoit une force de frappe vers le côté d'extrémité distale dans la direction de l'axe (O) et le trépan annulaire tourne librement sur l'extrémité distale d'un tube de revêtement (13) autour de l'axe (O) et se verrouille avec le côté d'extrémité distale dans la direction de l'axe (O). La face circonférentielle externe du trépan pilote (1) et la face circonférentielle interne du trépan annulaire (9) comprennent chacune une face de contact conique (3, 10) qui peuvent adhérer l'une à l'autre et qui ont des diamètres qui diminuent progressivement vers le côté d'extrémité distale dans la direction de l'axe (O). La face circonférentielle externe du trépan pilote (1) plus loin vers le côté d'extrémité arrière que la face de contact (3) et la face circonférentielle interne du tube de revêtement (13) comprennent chacune une face de butée conique (2, 14) qui peuvent adhérer l'une à l'autre et qui ont des diamètres qui diminuent progressivement vers le côté d'extrémité distale dans la direction de l'axe (O). Dans une section transversale le long de l'axe (O), l'angle d'inclinaison (β) de la face de contact (3, 10) par rapport à l'axe (O) est réglé pour être plus petit que l'angle d'inclinaison (α) de la face de butée (2, 14).
PCT/JP2016/079098 2015-09-30 2016-09-30 Outil de forage WO2017057716A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015192834A JP2017066706A (ja) 2015-09-30 2015-09-30 掘削工具
JP2015-192834 2015-09-30

Publications (1)

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WO2017057716A1 true WO2017057716A1 (fr) 2017-04-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003172088A (ja) * 2001-12-04 2003-06-20 Ushio Kogyo Kk 二重管式掘削工具
JP2008190287A (ja) * 2007-02-07 2008-08-21 Mitsubishi Materials Corp 掘削工具および掘削工法
WO2010071563A1 (fr) * 2008-12-18 2010-06-24 Sandvik Intellectual Property Ab Outil de forage pour forage à percussion dans la roche ; kit de complément, trépan annulaire et sabot de tubage
JP2012031610A (ja) * 2010-07-29 2012-02-16 Tft Co Ltd 二重管式掘削装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003172088A (ja) * 2001-12-04 2003-06-20 Ushio Kogyo Kk 二重管式掘削工具
JP2008190287A (ja) * 2007-02-07 2008-08-21 Mitsubishi Materials Corp 掘削工具および掘削工法
WO2010071563A1 (fr) * 2008-12-18 2010-06-24 Sandvik Intellectual Property Ab Outil de forage pour forage à percussion dans la roche ; kit de complément, trépan annulaire et sabot de tubage
JP2012031610A (ja) * 2010-07-29 2012-02-16 Tft Co Ltd 二重管式掘削装置

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