WO2017126247A1 - Outil d'excavation et procédé d'excavation - Google Patents

Outil d'excavation et procédé d'excavation Download PDF

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Publication number
WO2017126247A1
WO2017126247A1 PCT/JP2016/086558 JP2016086558W WO2017126247A1 WO 2017126247 A1 WO2017126247 A1 WO 2017126247A1 JP 2016086558 W JP2016086558 W JP 2016086558W WO 2017126247 A1 WO2017126247 A1 WO 2017126247A1
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WO
WIPO (PCT)
Prior art keywords
excavation
tip
pipe
tool
groove
Prior art date
Application number
PCT/JP2016/086558
Other languages
English (en)
Japanese (ja)
Inventor
田中　邦彦
中村　和由
泰隆 富田
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
Priority to US16/065,448 priority Critical patent/US20190003261A1/en
Priority to EP16886486.6A priority patent/EP3406841A4/fr
Priority to CN201680071232.3A priority patent/CN108291429A/zh
Publication of WO2017126247A1 publication Critical patent/WO2017126247A1/fr

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Classifications

    • 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
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
    • 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
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the present invention relates to an excavation tool used in a reverse circulation method for taking in dusts generated during excavation into a tool body and discharging it through an excavation pipe, and an excavation method using the excavation tool.
  • the compressed air used to strike the drill bit is generally ejected from the tip of the drill bit, and the bedrock is crushed during the excavation.
  • a certain flour is discharged to the rear end side by the compressed air through the space between the casing pipe and the excavating rod.
  • the compressed air ejected from the tip of the excavation bit leaks into the rock surrounding the excavation hole, reducing the strength of the surrounding rock, and in some cases, the surrounding rock collapses. May be incurred.
  • Patent Document 1 supplies fresh water as carrier water through the casing pipe, and sucks and discharges the flour that is mixed with the carrier water by a vacuum pump. Drilling tools have been proposed.
  • the present invention has been made under such a background.
  • An excavation tool capable of efficiently discharging water mixed with flour without using a vacuum pump, and excavation using the excavation tool.
  • the purpose is to provide construction methods.
  • the excavation tool of the present invention has an air supply pipe for supplying compressed air to the inner periphery of the excavation pipe in which the tool body is disposed at the tip.
  • the outer periphery of the excavation pipe is provided with a water supply channel for supplying excavation water to the tip of the tool body, and the tip of the tool body is fed with the flour generated during excavation.
  • a discharge passage is formed in the space between the drilling pipe and the air supply pipe together with the drilling water supplied from the water supply passage, and an exhaust hole opening in the space is formed at the tip of the air supply pipe. It is formed.
  • the excavation method of the present invention uses such an excavation tool to supply excavation water to the tip of the tool main body through the water supply channel while forming a excavation hole by the tool main body.
  • the generated dust is discharged together with the drilling water through the discharge passage to a space between the drilling pipe and the air supply pipe, and the dust and drilling water discharged to the space are discharged from the exhaust hole. It is characterized in that it is discharged to the rear end side by compressed air that is exhausted.
  • an exhaust hole opening in a space between the excavation pipe is formed at the tip of the air supply pipe.
  • the compressed air used to strike the tool body is supplied to the air supply pipe, exhausted from the exhaust hole, and the dust and drilling water discharged into the space between the drilling pipe and the air supply pipe are discharged into the exhaust pipe.
  • the compressed air exhausted from the hole is pushed out to the rear end side and discharged.
  • the compressed air thus supplied to give a striking force to the tool body can be used for the dusting and the discharge of the excavation water.
  • the tip of the tool main body it is possible to prevent the compressed air from leaking into the rock around the excavation hole and reducing the strength, thereby causing collapse.
  • drilling water is supplied to the front-end
  • the vacuum pump is not required. There is no damage caused by passing the flour inside. Also, when compressed air is exhausted and dusting and drilling water are pushed out to the rear end side, the space on the tip side from the exhaust hole becomes negative pressure. And the drilling water can be sucked and discharged continuously.
  • the exhaust hole may be formed so as to incline toward the rear end side toward the outer peripheral side of the tool body and open into the space.
  • emitted in this space can be extruded to a rear end side, and can be discharged
  • the casing pipe is used as a water supply pipe, and the excavation pipe is inserted into the inner periphery of the water supply pipe, thereby A water supply channel may be formed between the water supply pipe and the excavation pipe. Thereby, it becomes possible to supply drilling water to the front-end
  • a plurality of groove portions extending from the front end of the tool body to the rear end side are formed on the outer periphery of the front end of the tool body.
  • some of the groove portions are communicated with the water supply channel, and the remaining groove portions are communicated with the discharge channel, and the tip portions of the some groove portions and the tip portions of the remaining groove portions are You may communicate through the communicating groove formed in the front end surface of a tool main body.
  • the dust is efficiently recovered while the drilling water supplied from some of the grooves flows into the tip of the remaining grooves via the communication grooves, and the drilling pipe and the air supply pipe are It can be discharged into the space between.
  • a groove extending from the tip of the tool body to the rear end side and communicating with the water supply channel is formed, and in the tool body on the inner peripheral side of the groove, A hole extending from the front end of the tool body toward the rear end is formed as the discharge path, and the front end of the groove and the front end of the hole are connected via a communication groove formed on the front end surface of the tool body. May be communicated. Even with such a configuration, the dusting can be efficiently recovered while the drilling water supplied from the groove similarly flows into the tip of the hole through the communication groove.
  • the excavation tool provided with the above structure can be used for the excavation method of the present invention.
  • the strength of the rock mass around the excavation hole is not lowered and collapse is not caused, and the pressure of the compressed air is not required to be increased more than necessary, and the vacuum pump is provided. Since it is not necessary, stable excavation can be performed efficiently at low cost.
  • FIG. 1st Embodiment of the excavation tool of this invention It is a front view of the tool main body of embodiment shown in FIG. It is a rear view of the shank part in the tool main body of embodiment shown in FIG. It is ZZ sectional drawing in FIG. It is a sectional side view which shows 2nd Embodiment of the excavation tool of this invention. It is a front view of the tool main body of embodiment shown in FIG. It is a rear view of the shank part in the tool main body of embodiment shown in FIG. It is ZZ sectional drawing in FIG.
  • the tool body 1 is formed of a metal material such as a steel material, and has a substantially multi-stage cylindrical shape with a bottom centered on an axis O whose front end side in the axis O direction (left side in FIG. 1) has a one-step large diameter.
  • a metal material such as steel that is detachably attached to the outer periphery of the tip end portion of the pilot bit 2. .
  • the rear end portion of the pilot bit 2 having a small diameter is a shank portion 2A having a male screw portion formed on the outer periphery, and a cylindrical excavation pipe P1 is screwed into the shank portion 2A with the male screw portion of the shank portion 2A. It is attached.
  • the pilot bit 2 is given a rotational force around the axis O, and a thrust and striking force toward the tip side in the direction of the axis O.
  • the direction in which the axis O extends is referred to as the axis O direction
  • the direction from the excavation pipe P1 to the pilot bit 2 in the axis O direction is referred to as the tip side (left side in FIG. 1).
  • a direction from 2 to the excavation pipe P1 is referred to as a rear end side (right side in FIG. 1).
  • a direction passing through the axis O and orthogonal to the axis O is referred to as a radial direction or a radial direction.
  • the direction approaching the axis O is referred to as the inner peripheral side
  • the direction away from the axis O is referred to as the outer peripheral side.
  • a direction that circulates around the axis O is referred to as a circumferential direction.
  • the tip portion of the pilot bit 2 on the tip side of the shank portion 2A is formed so as to be reduced in diameter to approximately three steps toward the tip side. That is, the front end portion of the pilot bit 2 has, in order from the rear end side, a large diameter portion 2B having the largest outer diameter, a medium diameter portion 2C having an outer diameter smaller than that of the large diameter portion 2B, and an outer diameter smaller than that of the medium diameter portion 2C. A small small-diameter portion 2D. Among these, between the outer peripheral surface of the large-diameter portion 2B located on the most rear end side and the outer peripheral surface of the next medium-diameter portion 2C, the axis O gradually decreases toward the front end side in the axis O direction.
  • the pilot bit side contact surface 4 having a conical surface is formed.
  • the pilot bit side contact surface 5 is closer to the axis O than the inclination angle ⁇ formed by the pilot bit side contact surface 4 with respect to the axis O.
  • the inclination angle ⁇ is set small.
  • the length A in the direction parallel to the axis O on the pilot bit side contact surface 4 is reduced when the length A is directed toward the tip side in the axis O direction. It is formed so as to be equal to or less than the radius (the amount of decrease in radius) B, that is, the inclination angle ⁇ formed with respect to the axis O is 45 ° or more.
  • the pilot bit side contact surface 5 has a radius (a decrease in radius) that reduces the length C in the direction parallel to the axis O toward the tip side in the direction of the axis O by the length C.
  • the angle ⁇ formed with respect to the axis O is less than 45 °.
  • the length C of the pilot bit side contact surface 5 is sufficiently longer than the length B of the pilot bit side contact surface 4, and the radius D of the pilot bit side contact surface 5 is equal to the pilot bit side contact surface 5. It is set to be slightly larger than the radius B of the surface 4.
  • the outer peripheral surfaces of the large-diameter portion 2B, the medium-diameter portion 2C, and the small-diameter portion 2D are cylindrical surfaces having a constant outer diameter centered on the axis O, and of these, the axis O of the medium-diameter portion 2C. The length in the direction is set slightly longer than the large diameter portion 2B and the small diameter portion 2D.
  • a plurality of grooves 6 are formed at substantially equal intervals in the circumferential direction extending from the front end surface of the pilot bit 2 to the rear end.
  • a part of the groove portions one groove portion on the upper side in FIG. 1 and one groove on the left side in FIG. 2 6 ⁇ / b> A penetrates from the front end surface of the pilot bit 2 to the rear end surface of the large diameter portion 2 ⁇ / b> B. Yes.
  • the remaining groove portions the two groove portions on the lower side in FIG. 1 and the right side in FIG.
  • 6B extend from the front end surface of the pilot bit 2 to the front of the large-diameter portion 2B and cut off to the outer peripheral side. ing.
  • the remaining groove 6B extends from the front end surface of the pilot bit 2 to the vicinity of the rear end of the medium diameter part 2C in the medium diameter part 2C.
  • a hole having a circular cross-section toward the rear end side is formed as the discharge path 7 in the present embodiment toward the inner peripheral side.
  • One end of this hole portion opens to the inner peripheral portion (inner peripheral surface) of the bottomed cylindrical pilot bit 2, and the other end opens to the rear end portion of the remaining groove portion 6B.
  • a communication groove 8 is formed on the front end surface of the pilot bit 2 to connect the front end of the partial groove 6A and the front end of the remaining groove 6B.
  • the communication groove 8 extends from the front end of a part of the groove 6A in the radial direction with respect to the axis O to the front of the axis O as shown in FIG. It is formed in a Y-shape that reaches the leading ends of the two remaining grooves 6B while branching and curving in two without reaching.
  • the groove portion 6 has a substantially square or substantially U-shaped cross section, and the bottom surface facing the outer peripheral side is slightly with respect to the axis O so as to go to the outer peripheral side toward the rear end side as shown in FIG. It is inclined.
  • the communication groove 8 has a U-shaped cross section and extends on a plane perpendicular to the axis O.
  • a central face surface that is perpendicular to the axis O and toward the outer peripheral side toward the rear end side.
  • a conical surface-shaped outer peripheral gauge surface is formed on these face surface and gauge surface.
  • an excavation tip 9 made of cemented carbide harder than the pilot bit 2 is implanted perpendicularly to the face surface and gauge surface so as to avoid the opening of the groove portion 6 and the communication groove 8. It is installed.
  • the outer peripheral surface of the small-diameter portion 2D of the pilot bit 2 has an arc plate-shaped protrusion (having an outer peripheral surface that is an arc surface centered on the axis O) centered on the axis O protruding outward.
  • the section 2E is formed with a plurality of strips (three strips in the present embodiment) at equal intervals in the circumferential direction at positions spaced apart from the pilot bit side contact surface 5 by a slight distance.
  • these protrusions 2E extend from one end in the circumferential direction of the groove 6 (the end in the counterclockwise direction when viewed from the front as shown in FIG. 2). It is planted over the ridge 2E.
  • the axial line O is gradually reduced in diameter toward the front end side in the axis O direction on the inner peripheral surface of the rear end portion.
  • a conical ring-shaped ring bit side contact surface 10 is formed.
  • the ring bit side contact surface 10 has an inclination angle ⁇ equal to the pilot bit side contact surface 5 with respect to the axis O in a cross section along the axis O.
  • the ring bit side contact surface 10 has a radius that decreases when the length C in the direction parallel to the axis O is the same as the pilot bit side contact surface 5 toward the tip side in the axis O direction by this length C. It is formed so as to be longer than D, and is formed at an inclination angle ⁇ of less than 45 ° with respect to the axis O. 1, the ring bit side contact surface 10 is brought into close contact with the pilot bit side contact surface 5 as shown in FIG. 1, and the pilot bit side contact surface 5 extends from the front end surface of the pilot bit 2 in the axis O direction. Installed over the rear edge.
  • the length of the ring bit 3 in the axis O direction is substantially the same as the length in the axis O direction from the front end surface of the pilot bit 2 to the rear end of the pilot bit side contact surface 5.
  • the ring bit 3 is attached to the outer periphery of the pilot bit 2 so that the position of the tip surface of the ring bit 3 is substantially the same as the tip surface of the pilot bit 2 in the direction of the axis O.
  • the inner peripheral surface of the tip portion of the ring bit 3 has an inner diameter slightly larger than the small diameter portion 2D of the pilot bit 2.
  • On the inner peripheral surface of the tip there are concave grooves 3A that are slightly wider in the circumferential direction than the ridges 2E of the pilot bit 2.
  • the same number as the ridges 2E at equal intervals in the circumferential direction and ring in the direction of the axis O It is formed so as to penetrate from the tip surface of the bit 3 toward the ring bit side contact surface 10.
  • the depth in the radial direction of the groove 3A is set so that the inner diameter of the groove 3A is slightly larger than the outer diameter of the protrusion 2E.
  • the protrusion 2E is accommodated in the concave groove 3A, the ring bit 3 is inserted from the tip side of the tip of the pilot bit 2, and the pilot bit 2 is rotated to one end side in the circumferential direction (counterclockwise direction in FIG. 2).
  • the protruding portion 2E is engaged with the engaging portion 3B. Therefore, the position of the groove portion 6 of the pilot bit 2 coincides with the concave groove portion 3A of the ring bit 3 in the circumferential direction in a state where the protruding portion 2E is fitted to the engaging portion 3B.
  • the circumferential width of the engaging portion 3B is such that the position of the groove portion 6 of the pilot bit 2 overlaps with the concave groove portion 3A of the ring bit 3 in the circumferential direction in a state where the protruding portion 2E is fitted to the engaging portion 3B. Is set as follows. In the present embodiment, the circumferential width of the engaging portion 3B is set to be approximately the same as the circumferential width of the protrusion 2E.
  • the front end surface of the ring bit 3 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 9 made of a cemented carbide harder than the ring bit 3 is implanted perpendicularly to the face surface and gauge surface.
  • a plurality of concave grooves 3C are formed at equal intervals in the circumferential direction between the excavation tips 9 planted on the gauge surface on the outer peripheral surface of the tip portion of the ring bit 3.
  • the outer peripheral surface of the ring bit 3 has a rectangular shape with a cross section along the axis O extending in the axis O direction at a position spaced from the gauge surface and the rear end surface of the front end surface in the axis O direction.
  • a ring bit side locking groove 11 opened to the outer peripheral side is formed over the entire periphery.
  • the outer peripheral portion of the ring bit 3 on the rear end side of the ring bit side locking groove 11 is an annular ring bit side locking portion 12 that protrudes toward the outer peripheral side with respect to the ring bit side locking groove 11. ing.
  • the outer diameter of the ring bit side locking portion 12 is smaller than the tip of the ring bit 3, and the length in the direction of the axis O is set shorter than the ring bit side locking groove 11. Note that the outer peripheral portion of the rear end of the ring bit side locking portion 12 is chamfered.
  • a cylindrical casing pipe 13 centering on the axis O is disposed as the water supply pipe P2 in the present embodiment on the outer periphery of the pilot bit 2 to which the ring bit 3 is attached as described above. Yes.
  • a water supply path F is formed between the outer periphery of the excavation pipe P1 and the casing pipe 13 (water supply pipe P2).
  • the casing pipe 13 is obtained by integrating a cylindrical casing top 13B, which is also centered on the axis O, with a tip end portion of a cylindrical pipe body 13A centering on the axis O by welding or the like.
  • the pipe body 13A has an inner diameter larger than the outer diameter of the large-diameter portion 2B of the pilot bit 2, and a plurality of pipe bodies 13A are welded or the like to the rear end side of the pipe body 13A according to the depth of the drilling hole. It will be added sequentially.
  • 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 step portion.
  • the outer diameter of the rear end portion of the casing top 13B is substantially the same as the inner diameter of the front end portion of the pipe body 13A, and the rear end portion of the casing top 13B is fitted and joined to the pipe body 13A.
  • 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 2B of the pilot bit 2 and slightly larger than the outer diameter of the medium diameter portion 2C.
  • a casing pipe that can be brought into contact with the pilot bit side contact surface 4 formed on the rear end side of the pilot bit side contact surface 5 of the pilot bit 2 on 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.
  • the inclination angle ⁇ formed with respect to the axis O is equal to the inclination angle ⁇ of the pilot bit side contact surface 4, and the pilot bit side contact surface 5 and the ring bit side The angle is larger than the inclination angle ⁇ formed by the contact surface 10.
  • the inclination angle ⁇ is set to 45 ° or more.
  • the outer diameter of the tip 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 that is the maximum outer diameter of the ring bit 3.
  • a casing pipe-side locking groove 15 that opens inward on the inner peripheral side of the casing top 13 ⁇ / b> B in a rectangular shape with a cross section along the axis O extending in the direction of the axis O in order toward the tip.
  • a casing pipe side latching portion 16 that protrudes inward from the casing pipe side latching groove 15 is formed over the entire circumference.
  • the casing pipe side locking groove 15 and the casing pipe side locking portion 16 are set to have the same length in the axis O direction as the ring bit side locking groove 11 and the ring bit side locking portion 12, respectively.
  • the inner diameter of the casing pipe side locking groove 15 is set to be slightly larger than the outer diameter of the ring bit side locking portion 12.
  • the inner diameter of the casing pipe side locking portion 16 is set to be slightly larger than the outer diameter of the ring bit side locking groove 11 and smaller than the outer diameter of the ring bit side locking portion 12, Has been chamfered.
  • the ring bit 3 is rotated around the axis O. It is attached to the casing top 13B in a state that it is freely rotatable and is also locked to the front end side and the rear end side in the axis O direction within a range in which the ring bit side locking groove 11 and the casing pipe side locking groove 15 are formed.
  • the chamfered portions of the rear end outer peripheral portion of the ring bit side locking portion 12 and the front end inner peripheral portion of the casing pipe side locking portion 16 are mutually connected.
  • the rear end portion of the ring bit 3 is elastically reduced in diameter by pressing at least one of the casing top 13B and the ring bit 3 in the direction of the axis O toward the other.
  • the tip end portion of the casing top 13B is elastically expanded so that the casing pipe side locking portion 16 is in the ring bit side locking groove 11 and the ring bit side locking portion 12 is in the casing pipe side locking groove 15. What is necessary is just to accommodate so that it may each fit.
  • the pilot bit 2 attached to the front end of the excavation pipe P1 is inserted into the casing pipe 13 from the rear end side, and As described above, the protrusion 2E is accommodated in the concave groove 3A, and then the pilot bit 2 is rotated to one end side in the circumferential direction, so that the protrusion 2E is fitted and engaged with the engaging portion 3B.
  • the excavation pipe P1 is also added and connected sequentially according to the depth of the excavation hole, and the excavation pipe P1 at the end is connected to the excavator.
  • the pilot bit 2 thus inserted into the casing pipe 13 is positioned when the pilot bit side contact surface 4 contacts the casing pipe side contact surface 14 of the casing top 13B.
  • the tip portions of the pilot bit 2 and the ring bit 3 are brought into contact with the bedrock and the like, and the rotational force around the axis O and the tip side in the axis O direction from the excavator to the pilot bit 2 via the excavation pipe P1.
  • the ring bit 3 is pressed against the rear end side by resistance from the rock or the like, and the ring bit side contact surface 10 comes into close contact with the pilot bit side contact surface 5.
  • the ring bit 3 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 5.
  • the ring bit side latching portion 12 and the casing pipe side latching portion 16 are configured such that the pilot bit side contact surface 4 contacts the casing pipe side contact surface 14 and the ring bit side contact surface 10 functions as the pilot.
  • the casing pipe side locking groove 15 and the ring bit side locking groove 11 are arranged at positions spaced from both ends in the axis O direction. It is formed to be.
  • the air supply pipe P3 is inserted from the rear end side into the inner periphery of the cylindrical excavation pipe P1, and the tip of the air supply pipe P3 is inserted into the inner periphery of the pilot bit 2 in the tool body 1. Yes. Further, an exhaust plug 17 is attached to the tip of the air supply pipe P3, and the exhaust plug 17 is accommodated in the inner peripheral portion of the pilot bit 2.
  • the air supply pipe P3 is formed in a cylindrical shape centering on an axis O having an outer diameter smaller than the inner diameter of the excavation pipe P1, and a space having an annular cross section is formed between the air supply pipe P3 and the excavation pipe P1. E is formed. Compressed air used to drive the air hammer when applying a striking force to the pilot bit 2 as described above is supplied to the inner peripheral portion of the air supply pipe P3, for example.
  • the exhaust plug 17 is formed in a bottomed multistage cylindrical shape.
  • the exhaust plug 17 includes a front end portion having a large outer diameter, a rear end portion having a small outer diameter, and an intermediate portion having an outer diameter smaller than the front end portion and larger than the rear end portion. It has a cylindrical surface shape with a substantially constant outer diameter.
  • a male screw portion that is screwed into the inner periphery of the tip end portion of the air supply pipe P3 is formed on the outer periphery of the small diameter.
  • the large-diameter tip has an outer diameter that can be fitted into the inner periphery of the pilot bit 2 with a slight gap.
  • the rear end surface of the front end portion is formed in a conical surface shape toward the rear end side toward the inner peripheral side. That is, the rear end surface of the front end portion connecting the outer peripheral surface of the front end portion and the outer peripheral surface of the intermediate portion is formed in a conical shape.
  • the inclination angle of the rear end face of the front end portion with respect to the axis O is set to be equal to the inclination angle of the pilot bit 2 toward the rear end side with respect to the axis O of the discharge passage 7 as it goes toward the inner peripheral side.
  • Such an exhaust plug 17 is attached to the front end portion of the air supply pipe P3 and inserted into the inner peripheral portion of the pilot bit 2, and as shown in FIG.
  • the inner peripheral part of the bottomed cylindrical exhaust plug 17 communicates with the inner peripheral part of the cylindrical air supply pipe P3.
  • a plurality (three) of exhaust holes 17A opening into the space E are equally spaced in the circumferential direction in the present embodiment. Is formed. That is, one end of the exhaust hole 17A opens to the inner periphery of the exhaust plug 17, and the other end opens to a connection position between the rear end surface of the front end portion of the exhaust plug 17 and the outer peripheral surface of the intermediate portion.
  • the exhaust hole 17 ⁇ / b> A of the present embodiment is inclined so as to go to the rear end side as going to the outer peripheral side of the tool body 1.
  • An exhaust hole 17B having a smaller diameter than the exhaust hole 17A is also formed from the inner peripheral portion of the exhaust plug 17 to the distal end surface of the exhaust plug 17 perpendicular to the axis O. That is, one end of the exhaust hole 17 ⁇ / b> B opens to the inner periphery of the exhaust plug 17, and the other end opens to the distal end surface of the exhaust plug 17. Further, the exhaust hole 17B is inclined so as to go to the tip side as it goes to the outer peripheral side of the tool body 1.
  • the exhaust hole 17 ⁇ / b> B has a function of discharging residual earth and sand from the inner periphery of the pilot bit 2.
  • the striking force and thrust to the front end side in the direction of the axis O given to the pilot bit 2 from the excavator through the excavation pipe P1 are as follows. It is transmitted from the bit side contact surface 4 to the casing pipe 13 via the casing pipe side contact surface 14 of the casing top 13B, and from the pilot bit side contact surface 5 to the ring bit 3 via the ring bit side contact surface 10. Communicated. As a result, the excavation hole is formed by the excavation tip 9 planted on the front end surfaces of the pilot bit 2 and the ring bit 3, and the casing pipe 13 is inserted into the excavation hole. The rotational force about the axis O applied to the pilot bit 2 is also transmitted from the pilot bit side contact surface 5 to the ring bit 3 via the ring bit side contact surface 10.
  • excavation water is supplied from the rear end side to the water supply path F between the excavation pipe P1 and the casing pipe 13 which is the water supply pipe P2.
  • the drilling water in this embodiment is fresh water such as tap water.
  • the drilling water supplied in this way flows into the bottom portion of the drilling hole from the partial groove portion 6A of the pilot bit 2 opened at the tip of the water supply channel F and fills the bottom portion.
  • the pilot bit 2 flows through the communication groove 8 and reaches the remaining groove portion 6B while winding the dust as the pilot bit 2 rotates, and further passes through the discharge path 7 communicating with the remaining groove portion 6B. It flows into the space E on the rear end side from the rear end surface of the front end portion of the exhaust plug 17 in the periphery, and is filled from the exhaust hole 17A to the rear end side.
  • the drilling water mixed with the dust filled up to the rear end side of the exhaust hole 17A in this way passes through the inner peripheral portion of the exhaust plug 17 and the exhaust air is supplied to the compressed air supplied into the air supply pipe P3. As it ejects from 17A, it is sent to the rear end side and discharged. Further, since the tip of the space E from which the drilling water has been discharged becomes negative pressure, the drilling water remaining in the discharge path 7 from the remaining groove 6B is sucked together with the flour by the tip of the space E. In this way, the drilling water and the flour are continuously discharged by the ejection of compressed air from the exhaust hole 17A.
  • the compressed air for applying the striking force to the pilot bit 2 and the ring bit 3 of the tool body 1 as described above without requiring a vacuum pump or the like. It is possible to discharge drilling water mixed with flour.
  • the excavated water to be discharged passes through the space E between the excavated pipe P1 and the air supply pipe P3. Therefore, even if dusting is mixed, the discharge is not hindered. For this reason, it is possible to achieve stable and efficient low-cost excavation and dust discharge over a long period of time.
  • the compressed air for giving a striking force is used for discharging drilling water that is exhausted toward the rear end side in the space E and mixed with dust, it does not leak around the drill hole, Moreover, since the bottom of the excavation hole is filled with excavation water, the surrounding rock mass does not collapse due to strength reduction. Furthermore, since the drilling water is also supplied through the water supply path F between the drill pipe P1 and the casing pipe 13 which is the water supply pipe P2, the above-described fresh water having a lower specific gravity than muddy water or the like can be used as the drilling water. The compressed air ejected from the exhaust hole 17A is not required to have a pressure higher than necessary.
  • the exhaust hole 17A is inclined so as to go to the rear end side as it goes to the outer peripheral side of the tool body 1, so that the dust in the space E is compressed by the compressed air exhausted from the exhaust hole 17A.
  • Drilling water can be more reliably discharged to the rear end side.
  • the excavation pipe P1 is inserted into the casing pipe 13 as the water supply pipe P2, and the water supply path F is between the excavation pipe P1 and the casing pipe 13 (water supply pipe P2).
  • the present embodiment can be applied to the foundation pile driving method in which the casing pipe 13 is built in the excavation hole while forming the excavation hole.
  • the drilling water is supplied only to the tip side of the tool body 1 through the water supply channel F. For this reason, it becomes possible to supply the drilling water to the bottom of the drilling hole at the tip of the tool body 1 and discharge the dust while preventing the drilling hole itself from collapsing.
  • the tool body in addition to supplying the drilling pipe P1 into the casing pipe 13 and supplying the drilling water to the water supply path F therebetween, in this embodiment, the tool body attached to the tip of the drilling pipe P1.
  • a plurality of groove portions 6 extending from the front end surface to the rear end side are formed on the outer periphery of the front end portion of one pilot bit 2 at intervals in the circumferential direction, and some of the groove portions 6A communicate with the water supply path F.
  • the remaining groove 6 ⁇ / b> B communicates with the space E through which the drilling water is discharged via the discharge path 7.
  • the tip portions of some of the groove portions 6A and the remaining groove portions 6B communicate with each other through the communication groove 8 formed on the tip surface of the pilot bit 2, so that the tip portions of the pilot bit 2 and the ring bit 3 are planted.
  • the flour produced by the provided excavation tip 9 can be uniformly taken into the communication groove 8 and reliably discharged together with the excavation water.
  • the pilot bit 2 and the ring bit 3 are configured to rotate integrally around the axis O by the close contact between the conical pilot bit side contact surface 5 and the ring bit side contact surface 10. ing. For this reason, between the pilot bit 2 and the ring bit 3, the drilling water is supplied to the drilling hole from a part other than the part of the groove part 6A, or the flour is contained from a part other than the remaining groove part 6B. It is possible to prevent the drilling water from being discharged. As a result, it becomes possible to more reliably discharge the drilling water containing the flour that has been taken in by the communication groove 8 as described above.
  • the front ends of some of the grooves 6A communicating with the water supply path F and the discharge path 7 are provided.
  • the tip of the remaining groove 6B that communicates with the space E via the communication groove 8 is communicated by the communication groove 8, but the pilot bit 2 of the tool body 1 as in the second embodiment shown in FIGS.
  • a hole 18 may be formed as the discharge path 7 on the inner peripheral side of the groove 6 on the outer periphery of the tip, and the hole 18 and the tip of the groove 6 may be communicated by the communication groove 19.
  • the same reference numerals are assigned to the same parts as those of the first embodiment shown in FIGS. 1 to 4, and description thereof is omitted.
  • the plurality of grooves 6 (three also in this embodiment) formed on the outer periphery of the tip end portion of the pilot bit 2 are all the same as some of the grooves 6A of the first embodiment.
  • the pilot bit 2 is opened to the rear end surface of the pilot bit 2 and communicates with the water supply path F between the excavation pipe P1 and the casing pipe 13 (water supply pipe P2).
  • the hole 18 having a circular cross section penetrating from the tip surface of the pilot bit 2 to the inner peripheral portion of the pilot bit 2 is formed at a position away from the axis O on the inner peripheral side of each groove portion 6. ing.
  • the hole 18 extends in parallel with the axis O, the front end side end opens to the front end surface of the pilot bit 2, and the rear end side end opens to the inner peripheral surface of the pilot bit 2.
  • the tip end portions of these hole portions 18 and the tip end portions of the groove portions 6 communicate with each other via a communication groove 19 extending radially in a radial direction with respect to the axis O on a plane perpendicular to the axis O.
  • the large-diameter distal end portion of the exhaust plug 17 accommodated in the inner peripheral portion of the pilot bit 2 has a plurality of (three) notches 17C penetrating the outer periphery of the distal end portion in the direction of the axis O in the circumferential direction. Each is formed between the exhaust holes 17A.
  • the cutting water supplied from the water supply path F flows to the tip end side of the pilot bit 2 of the tool body 1 through each groove portion 6, and then flours while flowing through the communication groove 19. It winds up and reaches the tip of the hole 18, flows from the hole 18 into the inner peripheral portion of the pilot bit 2, and is filled from the notch 17 ⁇ / b> C to the rear end side from the exhaust hole 17 ⁇ / b> A of the exhaust plug 17. Then, the compressed air is exhausted from the exhaust hole 17A, so that the cutting water mixed with the dust is pushed and discharged to the rear end side, and the drilling water mixed with the new dust is discharged from the hole 18. Sucked.
  • the excavation tool of the second embodiment and the excavation method using the excavation tool do not require a vacuum pump or the like as in the first embodiment, and may require high pressure to the compressed air.
  • more cutting water can be supplied to the distal end side of the tool body 1 even if the number of grooves 6 formed in the distal end portion of the pilot bit 2 is the same as that in the first embodiment.
  • the distance in which the cutting water entrained with the flour flows through the communication groove 19 can be shortened, it is also suitable for excavation at high speed.
  • water mixed with flour can be efficiently discharged without using a vacuum pump, so the present invention is suitable for the foundation pile driving method.

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

Abstract

La présente invention concerne un outil d'excavation qui est conçu de telle sorte que : un tuyau de distribution d'air est introduit le long de la périphérie interne d'un tuyau d'excavation présentant une extrémité avant au niveau de laquelle un corps d'outil est agencé ; un passage d'alimentation en eau est disposé le long de la périphérie externe du tuyau d'excavation ; un passage d'évacuation permettant d'évacuer des havrits conjointement avec l'eau d'excavation dans l'espace entre le tuyau d'excavation et le tuyau de distribution d'air est formé dans l'extrémité avant du corps d'outil ; et un trou d'évacuation d'air ouvert sur l'espace est formé dans l'extrémité avant du tuyau de distribution d'air.
PCT/JP2016/086558 2016-01-20 2016-12-08 Outil d'excavation et procédé d'excavation WO2017126247A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/065,448 US20190003261A1 (en) 2016-01-20 2016-12-08 Drilling tool and drilling method
EP16886486.6A EP3406841A4 (fr) 2016-01-20 2016-12-08 Outil d'excavation et procédé d'excavation
CN201680071232.3A CN108291429A (zh) 2016-01-20 2016-12-08 挖掘工具和挖掘方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016008874A JP2017128920A (ja) 2016-01-20 2016-01-20 掘削工具および掘削工法
JP2016-008874 2016-01-20

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WO2017126247A1 true WO2017126247A1 (fr) 2017-07-27

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EP (1) EP3406841A4 (fr)
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WO (1) WO2017126247A1 (fr)

Cited By (1)

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EP3498967A4 (fr) * 2016-08-09 2020-03-18 Mitsubishi Materials Corporation Outil d'excavation

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WO2021090148A1 (fr) * 2019-11-06 2021-05-14 Flexidrill Limited Trépan hybride

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JP2003161092A (ja) * 2001-11-28 2003-06-06 Sumiko Consultant Kk 試錐方法及びその装置
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JP2007170087A (ja) 2005-12-22 2007-07-05 Koken Boring Mach Co Ltd 掘削装置
JP2010077699A (ja) * 2008-09-26 2010-04-08 Mitsubishi Materials Corp 掘削工具
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
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WO2015151737A1 (fr) * 2014-03-31 2015-10-08 三菱マテリアル株式会社 Outil de forage

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EP3498967A4 (fr) * 2016-08-09 2020-03-18 Mitsubishi Materials Corporation Outil d'excavation
US10851593B2 (en) 2016-08-09 2020-12-01 Mitsubishi Materials Corporation Drilling tool

Also Published As

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CN108291429A (zh) 2018-07-17
EP3406841A1 (fr) 2018-11-28
JP2017128920A (ja) 2017-07-27
US20190003261A1 (en) 2019-01-03
EP3406841A4 (fr) 2019-09-25

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