JP5357065B2 - Deviation direction detecting device and drilling method of tip bit in drilling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting a displacement direction of a tip bit in a drilling machine, which allows accurate drilling by accurately detecting the direction of the tip bit attached to the leading end of a drilling pipe, and a drilling method. <P>SOLUTION: The device includes a fixed magnet portion 60 attached to the tip bit 40 provided at a leading end portion of the drilling pipe 20; a rotary magnet portion 70 attached to a leading end portion of a gyroscope 30 inserted into the drilling pipe 20 so as to face the fixed magnet portion 60, the rotary magnet portion being rotatable with the central axis direction of the gyroscope 30 as the rotation axis and being stopped at a predetermined position relative to the fixed magnetic portion 60 by attracting force and repelling force caused with the fixed magnet portion 60; and a rotation angle measuring instrument 80 for measuring the rotation angle of the rotary magnet portion 70. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip bit deviation direction detecting device in a hole drilling machine and a drilling method using the same, and more particularly to a device suitable for detecting a tip bit deflection direction in a so-called bent boring method. The present invention relates to a hole drilling method using.

  In order to prevent liquefaction due to earthquakes, a boring boring method is known as a method of drilling diagonally from the ground toward the bottom of the building and forming a chemical injection hole below the building. Yes. In this bending boring method, it is necessary to accurately grasp the direction of the tip bit attached to the tip of the drilling tube, and various devices and methods have been proposed in the past. For example, as a method for detecting the position of the tip bit attached to the tip of the drilling tube, after inserting the gyroscope to the vicinity of the tip in the drilling tube, recording the signal from the gyroscope, Discloses a method of measuring a drilling locus by pulling out a gyroscope from the above (see Patent Document 1).

  In the technique described in Patent Document 1, a male or female die of a torsion detecting device configured to be rotatable with respect to the gyroscope is provided at the tip of the gyroscope, and at the tip of the drill rod. A female mold or a male mold of the twist detection device fixed to the hole direction determining member is provided. And rotating the male or female die at the tip of the gyroscope to engage the female or male die at the tip of the drilling rod, and detecting the angle at which the male or female die is rotated, Including a step of drawing the gyroscope from a point where the male and female dies of the detection device are engaged to a storage position on the ground side, and a step of recording a signal from the gyroscope and measuring a drilling locus at that time It is out.

Japanese Patent No. 3763399

  However, in the technique described in Patent Document 1 described above, a male mold and a female mold must be engaged in order to determine the initial position of the gyroscope at the tip of the drilling tube. At this time, if there is a foreign substance in the drilling tube, there is a possibility that the male mold and the female mold may be erroneously recognized as being engaged although the male mold and the female mold are not engaged. Further, if the engaging portion is clogged with foreign matter when the male mold and the female mold are engaged, the engagement between the male mold and the female mold may not be released.

  In such a state, the orientation of the tip bit provided at the tip of the drilling tube cannot be accurately grasped, and not only high-precision drilling cannot be performed, but also drilling becomes impossible. There is also a case.

  The present invention has been proposed in view of the above-described circumstances, and a drilling machine capable of performing highly precise drilling by accurately detecting the direction of the tip bit attached to the tip of the drilling tube. An object of the present invention is to provide a deflection direction detecting device and a drilling method for a tip bit.

  The tip bit deflection direction detecting device and the drilling method in the drilling machine of the present invention have the following features in order to achieve the above-described object. That is, the deflection direction detecting device for the tip bit in the drilling machine of the present invention is inserted into the drilling tube so as to face the fixed magnet portion attached to the tip bit of the tip portion of the drilling tube and the fixed magnet portion. Attached to the tip of the gyroscope, can rotate around the center axis of the gyroscope as a rotation axis, and stops at a predetermined position with respect to the fixed magnet due to the attractive force and repulsive force generated between it and the fixed magnet And a rotation angle measuring device for measuring the rotation angle of the rotation magnet unit.

  In this tip bit deviation direction detecting device, the fixed magnet portion is composed of a plurality of circularly arranged magnets, and each magnet has a portion where a plurality of N poles are continuous and a portion where a plurality of S poles are continuous. The rotating magnet part is composed of a plurality of magnets arranged in a circular shape, and each magnet is paired with the arrangement of the N pole and the S pole in the fixed magnet part. A configuration in which a plurality of S poles are continuously arranged and a portion where a plurality of N poles are continuous is divided into two parts.

  Further, the drilling method of the present invention uses the above-described tip bit deviation direction detecting device, and the step of inserting the gyroscope into the drilling tube and the rotating magnet part in the proximity of the fixed magnet part. And a step of measuring the rotation angle of the rotating magnet portion, and a step of recording a signal from the gyroscope while pulling out the gyroscope from the drilling tube and measuring a drilling locus. Is.

  In the tip bit deflection direction detecting device and the hole drilling method having such a configuration, the rotary magnet portion attached to the tip of the gyroscope is inserted into the hole drilling tube, and the tip of the tip of the hole drilling tube is inserted. When approaching the fixed magnet portion attached to the bit, the N pole of the rotating magnet portion, the S pole of the fixed magnet portion, and the rotating magnet portion are caused by the action of the attractive force and the repulsive force generated between the rotating magnet portion and the fixed magnet portion. The rotating magnet part rotates so that the S pole of the N pole and the N pole of the fixed magnet part face each other. And the deflection | deviation direction of a front-end | tip bit is detectable by measuring the rotation angle of a rotary magnet part with a rotation angle measuring device.

  Moreover, a drilling locus can be measured by recording a signal from the gyroscope while pulling out the gyroscope from the drilling tube.

  In the tip bit deflection direction detecting device and the drilling method in the drilling machine of the present invention, the fixed magnet portion attached to the tip bit when detecting the deflection direction of the tip bit attached to the tip portion of the drilling pipe In addition, the displacement direction of the tip bit can be detected simply by bringing the rotating magnet portion attached to the tip portion of the gyroscope close to each other. That is, there is no need to create a mechanical engagement state between the tip bit and the gyroscope, and even if foreign matter exists in the drilling tube, the direction of the tip bit is not obstructed by this foreign matter. Can be accurately grasped. In addition, unlike the prior art, the tip bit and the gyroscope mesh with each other, and there is no inconvenience that the gyroscope cannot be pulled out from the drilling tube. Further, when iron powder or the like is present in the hole drilling tube, the iron powder can be adsorbed by the rotating magnet portion attached to the gyroscope and removed from the hole drilling tube.

  Thus, according to the tip bit deflection direction detecting device and the drilling method in the drilling machine of the present invention, the deflection direction and the drilling locus of the tip bit can be accurately grasped, so that the accuracy is high. Drilling can be performed.

Schematic which shows the whole structure of the drilling machine which concerns on embodiment of this invention, and an accessory apparatus. Schematic which shows the state which inserted the gyroscope in the drilling pipe in the drilling machine which concerns on embodiment of this invention. Schematic which shows the state which pulled out the gyroscope from the inside of a drilling pipe in the drilling machine which concerns on embodiment of this invention. The enlarged view of the deviation direction detection apparatus which concerns on embodiment of this invention. The enlarged view of the rotating magnet part and rotation angle measuring device which concern on embodiment of this invention. Explanatory drawing of the operation principle of the deviation direction detection apparatus which concerns on embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a tip bit deflection direction detecting device and a drilling method in a drilling machine of the present invention will be described below with reference to the drawings. 1 to 6 illustrate a tip bit deflection direction detecting device according to an embodiment of the present invention. FIG. 1 is a schematic diagram showing the overall configuration of a drilling machine and accessory equipment, and FIG. FIG. 3 is a schematic view showing a state in which the gyroscope is pulled out from the drilling tube, FIG. 4 is an enlarged view of the deflection direction detecting device, and FIG. FIG. 6 is an explanatory view of the operation principle of the deviation direction detecting device.

<Hole drilling machine>
As the drilling machine 10 used in the present invention, a conventionally known horizontal drilling machine can be used. As shown in FIGS. 1 to 3, the hole drilling machine 10 is mounted on a base 11, a connection cutting device 12 that is placed on the base 11 to connect and cut the hole drilling tube 20, An angle adjustment device 13 for adjusting the insertion angle of the tube 20 and a propulsion drive device 14 for propelling the drilled tube 20 are provided. In addition, a reel 15 for winding the signal cable 31 connected to the gyroscope 30 and inserting and retracting the gyroscope 30 is disposed behind the hole drilling machine 10.

<Tip bit>
A tip bit 40 is attached to the tip portion of the drilling tube 20. As shown in FIG. 4, the tip bit 40 has a tapered portion 41 having a tapered tip portion. When straight drilling, the drill bit 20 and the tip bit 40 are rotated while drilling. At the time of curved hole drilling, the hole drilling tube 20 and the tip bit 40 are pressed into the ground without being rotated, and the curve is propelled by earth pressure acting on the tapered portion 41 of the tip bit 40.

<Deviation direction detector>
As shown in FIGS. 4 and 5, the deflection direction detection device 50 according to the embodiment of the present invention is rotatable to a fixed magnet portion 60 attached to the proximal end portion of the distal end bit 40 and the distal end portion of the gyroscope 30. And a rotation angle measuring device 80 for detecting the rotation angle of the rotation magnet unit 70.

  That is, the fixed magnet portion 60 is attached to the proximal end portion of the distal end bit 40 so as to be integrated with the distal end bit 40. On the other hand, a rotating magnet unit 70 that is rotatable with respect to the gyroscope 30 is attached to the tip of the gyroscope 30 so as to face the fixed magnet unit 60. The rotating magnet unit 70 is stopped at a predetermined position with respect to the fixed magnet unit 60 by an attractive force and a repulsive force generated between the rotating magnet unit 70 and the fixed magnet unit 60. Further, the rotating magnet unit 70 and the rotation angle measuring device 80 constituting the deviation direction detecting device 50 are accommodated in a cylindrical casing 51 having an outer diameter smaller than the inner diameter of the drilled tube 20.

<Fixed magnet part / Rotating magnet part>
As shown in FIG. 6, the fixed magnet unit 60 includes a plurality of magnets 61 arranged in a circular shape, and each magnet 61 includes a portion where a plurality of N poles are continuous and a portion where a plurality of S poles are continuous. It is divided into two. On the other hand, as shown in FIG. 6, the rotating magnet unit 70 includes a plurality of magnets 71 arranged in a circular shape, and each magnet 71 is paired with the arrangement of the N pole and the S pole in the fixed magnet unit 60. In addition, a portion where a plurality of S poles are continuous and a portion where a plurality of N poles are continuous are arranged in two. In this way, the manufacturing cost can be reduced by configuring the fixed magnet portion 60 and the rotating magnet portion 70 with the plurality of magnets 61 and 71.

<Rotation angle measuring instrument>
As shown in FIGS. 4 and 5, a rotation angle measuring device 80 for measuring the rotation angle of the rotating magnet unit 70 is attached between the tip of the gyroscope 30 and the rotating magnet unit 70. Yes. That is, as shown in FIG. 5, the rotation angle measuring device 80 is fixed to the tip of the gyroscope 30, and the rotating magnet unit 70 is attached to the tip of the rotating shaft 82 of the rotation angle measuring device 80. The rotation angle measuring device 80 is composed of, for example, a pulse encoder (rotary encoder), and when a pulse encoder of 256 pulses (8 bits / rotation) is used, the rotation angle of the rotating magnet unit 70 is measured in units of about 1.4 degrees. can do. The signal cable 81 of the rotation angle measuring instrument 80 is guided to the proximal end portion of the drilling tube 20 together with the signal cable 31 of the gyroscope 30 and connected to a computer (not shown).

<Detection of deflection direction of tip bit>
In order to detect the direction of the tip bit 40 using the deviation direction detection device 50 of the present invention, first, the gyroscope 30 is inserted into the drilling tube 20 and the rotating magnet portion attached to the tip portion of the gyroscope 30. 70 is brought close to the fixed magnet portion 60 attached to the tip bit 40 at the tip portion of the drilled tube 20. Then, as shown in FIG. 6, the N pole of the rotating magnet unit 70, the S pole of the fixed magnet unit 60, and the rotation by the action of the attractive force and the repulsive force generated between the rotating magnet unit 70 and the fixed magnet unit 60. The rotating magnet unit 70 rotates so that the S pole of the magnet unit 70 and the N pole of the fixed magnet unit 60 face each other.

  The direction of the tip bit 40 can be detected by measuring how much the rotating magnet unit 70 has rotated from the reference position using the rotation angle measuring device 80. At this time, the reference position may be set in any manner. For example, in the fixed magnet portion 60, the tapered portion 41 of the tip bit 40 is directed directly above (or directly below) the digging direction. In the rotating magnet unit 70, the N pole of the rotating magnet unit 70 and the S pole of the fixed magnet unit 60 face each other in this state, and the S pole of the rotating magnet unit 70 and the N pole of the fixed magnet unit 60 are in this state. Is set as a reference position. And it inserts in the drilling pipe 20 in the state in which the rotating magnet part 70 is in the reference position, and measures how much the rotating magnet part 70 has rotated from the reference position when approaching the fixed magnet part 60. Thus, the direction of the tapered portion 41 (tip bit 40) can be grasped.

<Drilling method>
Next, the drilling method of the present invention will be described.
In the drilling method of the present invention, the drilling tube 20 is penetrated into the ground by the propulsion driving device 14 while the drilling tube 20 is connected by the connection cutting device 12 of the drilling machine 10 installed on the ground, and the tip bit is inserted. Hole drilling is performed according to 40. Then, as the drilling progresses, the reel 15 is rotated at any time, the gyroscope 30 is inserted into the drilling tube 20 (see FIG. 2), the rotating magnet unit 70 is brought close to the fixed magnet unit 60, and rotated. The direction of the tip bit 40 is detected by the angle measuring instrument 80.

  From this state, the reel 15 is rotated in the reverse direction, and the retracting locus (drilling locus) of the gyroscope 30 is measured while retracting the gyroscope 30 (see FIG. 3). The signal cable 31 of the gyroscope 30 and the signal cable 81 of the rotation angle measuring instrument 80 are connected to a computer (not shown), and the direction of the tip bit 40 and the retracting locus (drilling locus) of the gyroscope 30 by the computer. Is calculated and displayed on a display device or the like.

  Then, based on the measured direction of the tip bit 40, the subsequent drilling direction is predicted and displayed on a display device or the like. When the predicted direction of the tip bit 40 is different from the planned line, the drilling direction may be controlled by rotating the drilling tube 20 and the tip bit 40. At this time, the planned line displayed on the display device is also changed with the rotation of the drill tube 20 and the tip bit 40. In this way, it is possible to perform highly accurate drilling by correcting the drilling direction while measuring the drilling locus as needed as the drilling progresses.

DESCRIPTION OF SYMBOLS 10 Hole cutter 11 Base 12 Connection cutting device 13 Angle adjustment device 14 Propulsion drive device 15 Reel 20 Drilling tube 30 Gyroscope 31 Signal cable 40 Tip bit 41 Taper part 50 Deflection direction detection device 51 Casing 60 Fixed magnet part 61 Magnet 70 Rotating magnet part 71 Magnet 80 Rotation angle measuring device 81 Signal cable 82 Rotating shaft

Claims (3)

A device for detecting the orientation of a tip bit in a drilling machine,
A fixed magnet attached to the tip bit of the drilling tube tip,
It is attached to the tip of a gyroscope that is inserted into the drilling tube so as to face the fixed magnet part, and can be rotated with the central axis direction of the gyroscope as a rotation axis, and between the fixed magnet part A rotating magnet portion that stops at a predetermined position with respect to the fixed magnet portion due to the generated attractive force and repulsive force;
A rotation angle measuring instrument for measuring the rotation angle of the rotating magnet unit;
An apparatus for detecting the direction of deflection of a tip bit in a drilling machine. The fixed magnet portion is composed of a plurality of magnets arranged in a circular shape, and each magnet is divided into two parts, a part where a plurality of N poles are continuous and a part where a plurality of S poles are continuous. ,
The rotating magnet part is composed of a plurality of magnets arranged in a circular shape, and each magnet has a portion where a plurality of S poles are continuous so as to be paired with the arrangement of N poles and S poles in the fixed magnet part. , A plurality of N poles are arranged in two parts and a continuous part,
The deflection direction detecting device for the tip bit in the drilling machine according to claim 1. A drilling method using a drilling machine,
A fixed magnet attached to the tip bit of the drilling tube tip,
It is attached to the tip of the gyroscope so as to face the fixed magnet part, and can be rotated with the central axis direction of the gyroscope as a rotation axis, and by the attractive force and repulsive force generated between the fixed magnet part Using a tip bit deviation direction detecting device comprising: a rotating magnet portion that stops at a predetermined position with respect to the fixed magnet portion;
Inserting the gyroscope into the drill tube;
A step of bringing the rotating magnet portion close to the fixed magnet portion;
Measuring the rotation angle of the rotating magnet part;
Recording a signal from the gyroscope while pulling out the gyroscope from the inside of the drilling pipe, and measuring a drilling locus;
A drilling method in a drilling machine, comprising:

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