JP2711331B2 - Drilling displacement measurement system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling displacement measuring system, and more particularly to a system for measuring a displacement in a hole dug by boring.

[0002]

2. Description of the Related Art When drilling a hole by boring, for example, an inclinometer is attached to a screw (auger screw) of an auger excavator for boring, and a deviation of a drilled hole from a vertical direction is detected by the inclinometer. Thus, a method of monitoring the vertical accuracy of the drilling to confirm the drilling accuracy is generally used.

In the above case, a differential transformer type inclinometer has been generally used as the inclinometer. This differential transformer type inclinometer has a configuration in which differential transformers are provided along the X-axis direction and the Y-axis direction, respectively, and the deviation of the borehole from the vertical direction is detected from the outputs of these differential transformers.

[0004] In addition, when an accumulated displacement amount of a hole is obtained by using an inclinometer, setting of an initial value of a displacement amount in a vertical direction is very important. Here, the setting method of the initial value in the auger screw is roughly divided into the following two.
Two methods are used. (1) A method in which the head portion of the auger screw in which the inclinometer is housed is aligned with the X axis or the Y axis, and each inclination angle in the X axis or the Y axis direction is set as an initial value. (2) A method in which the head portion of the auger screw is measured by transit measurement to check its posture, and this is set as an initial value.

[0005]

By the way, in the inclinometer used for detecting the deviation of the drilled hole from the vertical direction, for example, like the above-mentioned differential transformer type inclinometer, the inclinometer is used in the X-axis direction and the Y-axis direction.
Detectors such as a differential transformer are provided in the axial direction. In this case, these detecting elements extend in the X-axis direction or the Y-axis direction starting from a predetermined point, for example, the center point of the inclinometer, so that the detecting unit in the X-axis direction and the detecting unit in the Y-axis direction are provided. Is a certain distance away. Therefore, an error corresponding to the distance (a unique error of the inclinometer) occurs between the tilt angles detected in the X-axis direction and the Y-axis direction. Therefore, the method (1) has a problem that it is difficult to accurately determine the initial value of the displacement amount in the vertical direction due to the inherent error.

In the case of the above method (2), since the initial value depends on the surveying accuracy in the transit survey, there is a possibility that the posture error of the auger screw is included in the initial value. There is a problem that the value cannot be determined accurately and the vertical accuracy of the drilling cannot be monitored accurately.

In addition, a differential transformer type inclinometer conventionally used as an inclinometer is liable to cause a change in sensitivity or a movement of a zero point due to the influence of temperature, which is one of the factors that hinders accurate monitoring of the vertical accuracy of a drilled hole. I was

Accordingly, the present invention has been made to solve the above-mentioned problem, and it is possible to accurately determine an initial value of an inclinometer and to manage a vertical displacement of a rotation shaft center of an auger screw in a vertical direction. It is intended to provide a displacement measurement system.

[0009]

In order to solve the above-mentioned problems, according to the present invention, there is provided an auger screw for drilling a borehole for solving the above-mentioned problems. In a drilling displacement measurement system that measures the inclination angle of the auger screw in the X-axis direction or the Y-axis direction by an inclinometer and measures the displacement of the boring hole based on the measurement value, the inclinometer measures the auger screw by the inclinometer. X-axis direction or Y
Measuring the first inclination angle in the axial direction, and measuring the second inclination angle of the auger screw in the X-axis direction or the Y-axis direction by the inclinometer while rotating the auger screw by 180 °, An average value of the first inclination angle and the second inclination angle is set as an initial value in the X-axis direction or the Y-axis direction, and technical means for measuring the displacement based on the initial value is employed.

[0010] The invention of claim 2 is based on claim 1.
Technical means characterized by accumulating the displacements measured by the method. Such accumulation processing can be easily realized by, for example, changing a program using a computer.

Further, the invention of claim 2 takes technical means characterized in that a servo type inclinometer is used as the inclinometer. That is, the present invention measures the inclination angles in the X-axis direction and the Y-axis direction, respectively.
A servo-type inclinometer is preferably used.

[0012]

Therefore, in the drilling displacement measuring system of the present invention,
First measured in the X-axis direction or Y-axis direction of the inclinometer
The initial value is determined from the inclination angle of the second inclination angle and the average value of the second inclination angles measured in directions different from this by 180 °. Thus, in the method (1), the inherent error of the inclinometer is canceled, the initial value in the vertical direction can be set accurately, and the vertical accuracy at the time of excavation is significantly improved.

Further, by accumulating the displacement and obtaining the entire displacement of the borehole, the total displacement of the borehole can be obtained.

Furthermore, since the servo type inclinometer has almost no sensitivity change and zero point movement due to the influence of temperature, the vertical accuracy of drilling can be monitored more accurately by using this servo type inclinometer. It has a function that can be performed.

[0015]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. The system of the embodiment shown in FIG. 1 and FIG. 2 includes a moving vehicle 11, an auger screw 12, and a support member 13 for fixing and supporting the auger screw 12 by the moving vehicle 12. An auger excavator 10 for boring is provided.
Here, the auger screw 12 is driven by a motor 18 provided at an upper portion, rotates, for example, clockwise, and excavates a boring hole. The motor 18 can rotate forward and backward.

At the tip of the auger screw 12, an inclinometer 14 is mounted. In this embodiment, a servo-type inclinometer is used as the inclinometer 14. The servo-type inclinometer is configured, for example, by movably providing a piston serving also as a weight in a central portion inside a container filled with a fluid such as oil, and corresponding to the inclination angle of the piston. The movement is converted into an electric signal and taken out as an output.

The output of the inclinometer 14 is transmitted by a cable 16 to a slip ring 15 provided above the auger screw 12, and output to an external processing unit 20 by the cable 16.

The arithmetic processing unit 20 includes an arithmetic processing device 21 such as a computer, a display device 22 such as a CRT or an LCD,
It comprises a printing device 23 such as a printer or a plotter. Here, the display device 22 appropriately displays a processing state and a processing result in the arithmetic processing device 22. The printing device 23 prints the above-described processing results and the like as needed while the processing in the arithmetic processing device 22 is in progress or after the processing is completed.

The arithmetic processing unit 22 operates in accordance with a predetermined processing program stored in a storage medium such as an internal or external ROM (read only memory), hard disk, or FD (flexible disk).
8 to control the display device 22 and the printing device 23, or to perform arithmetic processing on data input from the inclinometer 14 to execute an operation which is the gist of the present invention described below.

That is, the present invention provides an inclinometer 14 attached to an auger screw 12 for drilling a borehole.
X direction of the auger screw 12 or Y
In a drilling displacement measurement system that measures a tilt angle in an axial direction and measures a displacement of the boring hole based on the measurement value, a first in the X-axis direction or the Y-axis direction of the auger screw 12 is measured by the inclinometer. While measuring the inclination angle, the inclinometer 14 measures the second inclination angle of the auger screw 12 in the X-axis direction or the Y-axis direction while the auger screw is rotated by 180 °. The average value of the second inclination angle and the second inclination angle is an initial value in the X-axis direction or the Y-axis direction.

That is, first, the auger screw 12
The initial value of the amount of displacement in the vertical direction of the front end of is determined. This determination is made in the following procedure. First, an X-axis and a Y-axis perpendicular to the X-axis are set on a plane at the height where the inclinometer 14 at the tip of the auger screw 12 is located. Then, the positive direction of the sensitivity of the inclinometer 14 is adjusted to the positive direction of the X-axis, and in this state, the output from the inclinometer 14 is input to measure the tilt angle (+ θX0) in the positive direction of the X-axis.

Next, the motor 18 is rotated to rotate the auger screw 12 by 180 ° from the above position. In this state, the output from the inclinometer 14 is input in the same manner as described above, and the inclination angle (= θX0) in the negative direction of the X axis is measured.

The 2 on the X axis measured as described above
Tilt angle θX0 = {(+ θX0) + (− θX0)} / 2 of the average value of the two tilt angles (+ θX0) and (−θX0)
Ask for. Then, the obtained inclination angle θX0 is expressed by X
This is the initial value in the axial direction.

Similarly, the inclination angle in the positive direction of the Y axis (+ θY0) and the inclination angle in the negative direction (−θY)
0) is measured, and the inclination angle θY0 = {(+ θY0) + (− θY0)} / 2 of these average values is obtained. Then, the obtained inclination angle θY0 is set as an initial value in the Y-axis direction.

After the initial values in the X-axis direction and the Y-axis direction are determined as described above, the present invention measures the displacement based on the initial values. That is, based on the initial value, the inclination angles in the X-axis direction and the Y-axis direction at predetermined depths, for example, every 5 meters, are sequentially measured to measure the displacement of the boring hole and accumulate these displacements. Specific procedures for measuring and accumulating these displacements
For example, a case in the X-axis direction will be described with reference to FIG. It should be noted that the same operation can be performed in the Y-axis direction.

When the auger screw 12 is rotated in the forward direction to drill a boring hole, and the tip of the auger screw 12 reaches a predetermined depth S1, the auger screw 1
2 is stopped, and the tilt angle θX1 in the X-axis direction is obtained from the output value of the inclinometer 14 at that time. Further, the displacement amount LX1 in the X-axis direction is measured from the depth S1 and the inclination angle θX1. Here, as shown in Table 1, the cumulative displacement at the depth S1 is LX1.

[0027]

[Table 1]

After the above measurement, the auger screw 12
Is further rotated in the forward direction to drill a boring hole, and the tip of the auger screw 12 has a predetermined depth (S1 + S2).
, The rotation of the auger screw 12 is stopped, and the tilt angle θX2 in the X-axis direction is obtained from the output value of the inclinometer 14 at that time. Further, the displacement LX2 in the X-axis direction is measured from the depth (S1 + S2) and the inclination angle θX2. Here, the cumulative displacement at the depth (S1 + S2) is LX1 + LX2.

Similarly, the inclination angle θX3 in the X-axis direction at the depth (S1 + S2 + S3) is obtained. Then, the displacement LX3 in the X-axis direction is measured from the depth (S1 + S2 + S3) and the inclination angle θX3, and the depth (S1 + S2 +
The cumulative displacement LX1 + LX2 + LX3 in S3) is obtained.

FIG. 4A shows an example of a change in the X-axis direction with respect to the depth of the cumulative displacement obtained as described above, and FIG. 4B shows an example of a change in the Y-axis direction similarly. , Respectively.

[0031]

The present invention is as described above, and the average value of the first tilt angle measured in the X-axis direction or the Y-axis direction of the inclinometer and the second tilt angle measured in a direction 180 ° different from the first tilt angle. Since the initial value is obtained from, the inherent error of the inclinometer is canceled out, the initial value in the vertical direction can be set accurately, and a drilling displacement measurement system that significantly improves the vertical accuracy when excavating is provided You can do it.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the appearance of a drilling displacement measuring system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a drilling displacement measurement system according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a process of accumulating displacement of a drilling in the drilling displacement measuring system of the embodiment.

FIG. 4A is a graph showing a measurement result of a drilling hole in the XX direction by the drilling displacement measurement system of the embodiment, and FIG. 4B is a graph showing a measurement result of the drilling direction in the YY direction. .

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 auger excavator 11 moving vehicle 12 auger screw 14 inclinometer 15 slip ring 20 arithmetic processing unit 21 arithmetic processing unit 22 display device 23 printing device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Nagano 1-10-8 Tanihara, Nerima-ku, Tokyo Within Tokyo Keizai Co., Ltd. (72) Isao Mizuno 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Inside the Kanto Branch (72) Inventor Katsutoshi Watanabe 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Inside the Kanto Branch (72) Inventor Torajiro Soejima 2-16-2 Minami Kamata, Ota-ku, Tokyo Tone Underground Technology Co., Ltd. (56) References JP-A-1-278687 (JP, A) JP-A-6-186032 (JP, A) JP-A-4-110607 (JP, A) JP-A-61-1986 2012 (JP, A) JP-A-61-1791 (JP, A) Japanese Utility Model Laid-Open No. 2-97484 (JP, U) Tokuhyo Hei 3-500574 (JP, A)

Claims (3)

(57) [Claims] An inclinometer (14) attached to an auger screw (12) for excavating a borehole measures the inclination angle of the auger screw (12) in the X-axis direction or the Y-axis direction, and the measured value In the drilling displacement measuring system for measuring the displacement of the boring hole based on the auger screw, the inclinometer measures a first inclination angle of the auger screw (12) in the X-axis direction or the Y-axis direction, and Is rotated by 180 °, a second inclination angle of the auger screw (12) in the X-axis direction or the Y-axis direction is measured by the inclinometer (14), and the first inclination angle and the second inclination are measured. The average value with the angle is set as the initial value in the X-axis direction or the Y-axis direction,
A drilling displacement measurement system, wherein the displacement is measured based on the initial value. 2. The drilling displacement measuring system according to claim 1, wherein the displacement is accumulated. 3. The drilling displacement measurement system according to claim 1, wherein a servo-type inclinometer is used as the inclinometer.