JP2002242574A - Drilling method - Google Patents

Abstract

(57) [Summary] [Problem] A drilling method capable of accurately specifying a drilling position, accurately predicting a drilling direction, and drilling with high accuracy along a planning line. I will provide a. SOLUTION: A gyroscope (4) is inserted into a drilling rod (3) excavating a ground (G);
Gyroscope (4) Male or female type (10
B) is rotated and the female die (10) of the drill rod tip (2) is rotated.
A) or the step of engaging with the male mold, the step of detecting the angle of rotation of the male mold (10B) or the female mold at that time, and the male mold (10B) and the female mold ( 1
0A) and the step of retracting the gyroscope (4) from the point of engagement with the ground position to the storage position on the ground side, and recording the signal from the gyroscope (4) at that time to measure the drilling locus. Drilling method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling method for drilling ground along a drilling planning line using a horizontal drilling machine and a drilling rod (so-called "curved boring").

[0002]

2. Description of the Related Art In curved boring, it is required to accurately specify a digging position. For this,
Conventionally, a beacon type or steering type position detecting device has been used.

A beacon-type position detecting device can measure a tip position, a drilling direction, a depth, and the like by receiving a radio wave or an electromagnetic wave transmitted from a transmitter at a tip portion in a hyperbolic shape immediately above the device. Since radio waves or electromagnetic waves are used as a communication medium, communication cannot be performed or an error occurs due to stray current or magnetism existing in the natural world. In many cases, measurement cannot be performed due to an electrical obstacle existing between the transmitter and the receiver or an absorber such as a reinforcing bar in reinforced concrete.
Also, it is not possible to measure the position directly below the skeleton.

On the other hand, the steering type acquires position information from a position detection sensor at the distal end via a communication cable inserted into a rod, and measures a drilling locus by computer processing at the hand side. Since the determination is made by measuring the terrestrial magnetism with a compass, it is often impossible to measure the terrestrial magnetism accurately for the same reason as in the above detection method.

[0005] The measurement is performed in real time, and the measurement position is an estimated value calculated from the measured value, and the cumulative calculation is performed with the measured point as a fixed point, so that the accuracy is low.
Further, since cables having the same length as the rod length are connected one by one, the efficiency is low.

[0006] When the drilling position is detected, if the drilling direction immediately thereafter can be grasped or predicted, it is possible to drill with high accuracy along the planning line. However, with these conventional techniques, it is impossible to accurately predict a drilling direction, and it is difficult to perform a drilling operation with high accuracy along a planning line.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and it is possible to accurately specify a drilling position, and furthermore, to change a drilling direction. It is an object of the present invention to provide a drilling method capable of accurately predicting and drilling with high accuracy along a planning line.

[0008]

A drilling method according to the present invention includes a step of inserting a gyroscope into a drilling rod excavating the ground, and a tip of the gyroscope is rotated with respect to the gyroscope. A male type or a female type of a freely configured torsion detecting device is provided, and a female type of a torsion detecting device fixed to a drilling direction determining member at the drilling rod distal end at a drilling rod distal end portion. Alternatively, a male mold is provided, and the male or female mold at the tip of the gyroscope rotates and engages with the female or male mold at the tip of the drilling rod,
At this time, a step of detecting the angle at which the male mold or the female mold is rotated, and a step of retracting the gyroscope from a point where the male mold and the female mold of the torsion detecting device are engaged to a storage position on the ground side, Recording the signal from the gyroscope to measure the drilling trajectory.

According to the present invention having such a configuration, the gyroscope is retracted from the point where the male and female types of the torsion detecting device are engaged to the storage position on the ground, and at that time, the signal from the gyroscope is received. Since the trajectory of the gyroscope retraction, that is, the drilling trajectory is measured by recording, the drilling position can be accurately specified from the trajectory.

Further, the present invention provides a step of predicting a drilling direction by a drilling rod based on the angle at which the male or female die has rotated, wherein the predicted drilling direction is deviated from a planned line to be drilled. Judging whether or not they are positioned.
Then, when the predicted drilling direction is deviated from the planned drilling line, the drilling rod is rotated to change the direction in which the drilling direction determining member at the tip of the drilling rod points. Control the drilling direction.

As described above, since the angle at which the male or female die rotates corresponds to the direction in which the drilling direction determining member is directed, the angle at which the drill rod advances can be accurately predicted. Therefore, it is also possible to determine whether the predicted drilling direction deviates from the planned drilling line.

The present invention also provides a step of previously rotating a drilling rod from the ground side by a predetermined angle, and using the predetermined angle and the angle at which the male or female die is rotated from the ground side. Calculating a correction coefficient for the angle of rotation of the hole and the rotation angle at the tip of the drilling rod.

Therefore, when the drilling proceeds, the drilling rod becomes longer and residual distortion occurs in the rod, and when the rotation angle of the tip device becomes smaller than the rotation angle of the rod, the drilling rod is reduced from 1/2. After about one rotation, the rod rotation angle at that time is compared with the rotation angle of the tip device, and a correction coefficient is calculated from the difference. The correction coefficient is automatically corrected at the time of computer processing to reduce the error due to the occurrence of residual distortion. Can be erased.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a drilling means for performing the present drilling method. In the figure, a drilling rod 3 driven by a drilling machine 1 extends into a ground G in front of and below a drilling machine, and a tip 2 of a well-known curved boring construction is attached to its tip. The drilling machine 1 is equipped with a gyro insertion / retraction device 7 for inserting and retracting a gyroscope (hereinafter referred to as a gyro) 4 and a storage box 6 for accommodating the gyro 4. A reel 5 around which a communication cable 8 is wound is placed behind the excavator 1, and the cable 8 is connected to a gyro 4 inserted into the drilling rod 3, and the gyro 4 is In the illustrated state, the distal end portion 2 is engaged via a torsion detecting device 10 described later.

FIG. 2 shows a tip portion 2 for bending boring. A nozzle 15a for jetting a jet for excavation is opened at the tip, and a drilling direction for excavating in a curved shape. The determining member 12 is provided to be inclined with respect to the axis. Beacon-type sensor 13 is provided behind the sensor. FIG. 2 shows a state in which the gyro 4 is engaged with the rear end of the distal end portion 2 via the torsion detecting device 10.

FIGS. 3 and 4 show the torsion detecting device 10. FIG. 3 shows a female mold 10A on the distal end portion 2 side, and FIG. 4 shows a male mold 10B on the gyro 4 side to be engaged. The male mold 10B is inserted into the female mold 10A in the X direction, and the spiral is inserted. It is engaged by rotating in the direction of arrow R along the surface s,
The gyro 4 detects the twist of the tip 2. In addition,
The relationship between the female mold and the male mold may be on either the tip 2 side or the gyro 4 side.

Next, an embodiment of the drilling method will be described.
In drilling, the drilling rod 3 is driven by the drilling machine 1 on the ground, and excavation is promoted at the tip 2 (prior art). Then, the measurement of the drilling locus of the drilling end portion is performed by first inserting the gyro 4 into the drilling rod 3 by the gyro insertion / retraction device 7 as shown in FIG.
The torsion detecting device 10 can rotate independently of the gyro 4,
The gyro 4 is fitted on the tip 2 and its direction is measured based on the vertical direction detected by the gyro 4.

Next, the drilling trajectory is measured while the gyro 4 is pulled out by the gyro insertion / retraction device 7, and the measured value is sent to a computer (not shown) on the ground via a cable. The gyro 4 is stored in the storage box 6 (FIG. 6). When the gyro 4 is stored in the storage box 6, the computer performs data processing and displays the measured drilling trajectory along with the planned planning line. At the same time, the next drilling direction is predicted and displayed from the measured direction of the tip device 2. When the predicted direction is different from the planned line, the rod 3 is rotated to control the drilling direction. At this time, the schedule line on the computer display is configured to change as the rod 3 rotates.

FIG. 7 shows a state in which the gyro 4 has been inserted for measurement after the drilling of the bent portion has been completed. From this state, the gyro 4 is pulled out to measure the locus. The above drilling is performed (FIG. 8). In this way, during drilling, the drilling locus of the drilling end portion is measured as needed,
Advance the drilling while correcting the drilling direction.

When drilling progresses and the drilling rod 3 becomes longer, residual distortion occurs in the rod 3, and the rotation angle of the tip 2 may be smaller than the rotation angle of the rod 3. In such a case, the drilling rod 3 is moved from 1/2 to 1 from the ground side.
The rod is rotated about the rotation, the rod rotation angle at that time is compared with the rotation angle of the tip, and a correction coefficient is calculated from the difference.
Then, the correction is automatically performed at the time of computer processing, and errors due to the occurrence of residual distortion are eliminated.

[0021]

The effects of the present invention are listed below. (1) The excavation position can be accurately specified by measuring the excavation locus. The measurement is performed after the drilling is completed and is not the accumulation of the estimated values, so that the measurement accuracy is high. (2) The traveling direction of the drilling rod can be accurately predicted based on the rotation angle when the male and female types of the torsion detection device are engaged. Then, the drilling can be performed with high precision along the planned drilling line. (3) Correction coefficients for the rotation of the ground side rod and the rotation of the rod at the tip of the drilling rod can be easily and accurately determined, and errors due to the occurrence of residual distortion can be eliminated to perform drilling with high precision. (4) Since a gyro is used, measurement can be performed in any environment without being affected by an electrical disturbance. (5) Since it is a mechanical built-in type measuring instrument, the labor for installation and removal can be saved, and the drilling time can be increased. Further, by inserting and retracting the gyro from the rear end of the rod using the measurement reel, measurement can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a drilling means for performing a drilling method of the present invention.

FIG. 2 is a cross-sectional view showing details of the bent boring apparatus shown in FIG. 1;

FIG. 3 is a perspective view showing a female type of the torsion detection device.

FIG. 4 is a perspective view showing a male type of the twist detection device.

FIG. 5 is a sectional view showing a state where a gyro is inserted.

FIG. 6 is a sectional view showing a state in which the gyro is drawn in from FIG. 5;

FIG. 7 is a sectional view showing a state in which a gyro is inserted to measure a trajectory.

FIG. 8 is a sectional view showing a state in which the gyro is drawn in from FIG. 7 and drilling is resumed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drilling machine 2 ... Tip part 3 ... Drilling rod 4 ... Gyro 5 ... Reel 6 ... Gyro storage box 7 ... Gyro insertion / retraction device 8 ... Cable DESCRIPTION OF SYMBOLS 10 ... Torsion detection apparatus 10A ... Female type 10B ... Male type 12 ... Drilling direction determination member

Claims (4)

[Claims] 1. A method of inserting a gyroscope into a drilling rod excavating the ground, wherein a gyroscope tip is provided with a male type or a torsion detecting device rotatably configured with respect to the gyroscope. A female mold is provided,
At the tip of the drilling rod, a female or male type of torsion detector fixed to the drilling direction determining member at the tip of the drilling rod is provided, and the male or female type at the tip of the gyroscope rotates. Engaging the female or male die at the tip of the drilling rod, detecting the angle of rotation of the male or female die, and the male and female die of the torsion detection device A drilling method comprising: a step of retracting a gyroscope from a point of engagement 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. 2. A step of predicting a drilling direction by a drilling rod based on the angle at which the male or female die is rotated, and determining whether the predicted drilling direction is deviated from a planned drilling line. Determining the presence or absence of the hole. 3. The direction in which the drilling rod is rotated and the drilling direction determining member at the tip of the drilling rod is oriented when the predicted drilling direction is deviated from the planned drilling line. The drilling method according to claim 2, wherein the drilling direction is controlled by controlling the drilling direction. 4. A step of previously rotating the drilling rod from the ground side by a predetermined angle, and an angle at which the drilling rod is rotated from the ground side using the predetermined angle and the angle at which the male or female die is rotated. 4. The drilling method according to claim 3, further comprising the step of: calculating a correction coefficient of the rotation angle at the tip of the drilling rod.