JPH10281763A - Inclination meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an accurate measurement constantly while eliminating useless measurement by interrupting the measurement upon detecting removal of a guide roller from a guide groove. SOLUTION: Since the guide rollers 4A, 4B of an inclination meter 1 are guided by guide grooves in a casing pipe, the inclination meter 1 is not displaced at all in the rotational direction around the longitudinal axis thereof. When one of the rollers 4A, 4B is removed from the guide groove in the pipe, the inclination meter 1 is displaced in the rotational direction around the longitudinal axis thereof and a signal is delivered from an angular speed sensor. The signal is subjected to analog signal processing and converted through an A/D converting section into a digital signal which is inputted to CPU and subjected to threshold value processing. If the digital signal is larger than a specified threshold value, the CPU makes a decision the rollers 4A, 4B are removed from the guide groove and a message to this effect is presented on a display and subsequently measurement is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inclinometer for measuring horizontal displacement in the ground caused by landslides or the like using a borehole formed in the ground.

[0002]

2. Description of the Related Art An inclinometer measures the amount of ground displacement caused by landslides and the like, and is inserted into a casing pipe installed in a boring hole formed in the ground,
By measuring the inclination of the point where the boring hole is formed, the displacement in the ground in the horizontal direction is measured. As shown in FIG. 6, such an inclinometer includes a probe 2, an X inclination sensor 3A including an acceleration sensor for measuring the inclination in the X direction on a plane perpendicular to the longitudinal direction of the probe 2, and
The probe 2 includes a Y inclination sensor 3B composed of an acceleration sensor for measuring the inclination in the Y direction, and guide rollers 4A and 4B provided at both ends of the probe 2. The guide rollers 4A, 4A
The interval between B is set to approximately 50 cm.

[0003] The inclination measurement using such an inclinometer 1 is performed as follows. First, a boring hole 10 is formed in the ground as shown in FIG. 7, and a casing pipe 11 having guide grooves 11A, 11B, 11C and 11D is buried in the boring hole as shown in FIG. Then, the inclinometer 1 is inserted into the casing pipe 11 by engaging the guide rollers 4A and 4B of the inclinometer with any two of the guide grooves 11A and 11C or 11B and 11D. Inclinometer 1
The inclinometer 1 inserted into the casing pipe 11 is moved up and down by the wire 6.

After the inclinometer 1 is lowered to the bottom 10A of the boring hole, the inclination is measured at a plurality of measurement points along the boring hole 10 while the inclinometer 1 is sequentially pulled up by the wire 6. That is, X in the inclinometer 1
A point P, which is an intermediate point between the inclination sensor 3A and the Y inclination sensor 3B, is matched with a measurement point set in the borehole, and the inclination angles in the X direction and the Y direction at the measurement point are determined by the X inclination sensors 3A and Y. The inclination is measured by the inclination sensor 3B, and based on the measured inclination angle, the inclinometer 1
The displacement of the boring hole at the measurement point is measured by an arithmetic unit 13 such as a microcomputer connected to the computer. Since the interval between the guide rollers 4A and 4B of the inclinometer 1 is approximately 50 cm, the measurement points in the casing pipe 11 are set at approximately every 50 cm. This displacement is measured at each measurement point, and the same measurement is performed by inverting the inclinometer 1 by 180 °, and the displacement in the ground is measured by accumulating the bottom of the borehole as a fixed point from the measurement results. It is. Then, the inclination of the borehole is measured over time and displayed on the data display unit of the arithmetic unit 13 on the ground, and the measurer can determine the degree of landslide from the displacement amount of the ground at the position of the borehole based on the data. Measure.

[0005]

However, during the measurement by the above-mentioned inclinometer, the guide rollers 4A, 4B are moved by the guide grooves 11A, 11B, 11C of the casing pipe 11.
There is a case where the driver loses the wheel from 11D. As described above, when the guide rollers 4A and 4B derail, the measured values become inaccurate. However, since the inclinometer 1 is under the ground, the measurer does not notice the derailment, so the measurement is continued after the derailment. As a result, the measurement work after derailing is wasted. Also,
If an automatic inclinometer that automatically moves the inclinometer up and down and captures measurement data is used, inaccurate data will continue to be measured after derailment, resulting in inaccurate measurement data. Reliability decreases.

An object of the present invention is to notify a measurer of a derailment when a guide roller is derailed, or to execute processing such as stopping the measurement in the case of an automatic inclination measuring device. It is to provide an inclinometer that can be used.

[0007]

FIG. 1 shows an embodiment of the present invention.
According to the present invention, in the casing pipe 11 having the guide grooves 11A, 11B, 11C and 11D buried in the ground, the guide rollers 4A and 4B are connected to the guide grooves 11A, 11B, 11C and 11D. The present invention is applied to the inclinometer 1 which moves the inside of the casing pipe 11 while guiding to measure the inclination in the ground, and detects that the guide rollers 4A, 4B have come off from the guide grooves 11A, 11B, 11C, 11D. The above object is achieved by providing the means 7.

[0008] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an inclinometer according to the present invention. In the inclinometer of the present embodiment, the same components as those of the inclinometer described in the above-mentioned prior art are denoted by the same reference numerals, and detailed description thereof will be omitted. The inclinometer 1 according to the present embodiment includes guide rollers 4A and 4B.
Are the guide grooves 11A, 11B, 11 of the casing pipe 11.
C, 11D is provided with a derailing detection unit 7 for detecting that the wheel has been derailed.

FIG. 2 is a block diagram showing the structure of the derailing detecting section 7. As shown in FIG. As shown in FIG. 2, the derailing detection unit 7 includes an angular velocity sensor 20 that detects an angular velocity in a rotational direction around the long axis of the inclinometer 1, and amplifies and filters an analog signal output from the angular velocity sensor 20. And an A / D conversion unit 22 that A / D converts the processed analog signal to obtain a digital signal
And the guide rollers 4A and 4B are formed on the basis of the digital signal as described later.
CPU 23 that determines whether or not the vehicle has derailed from C and 11D
And a communication interface 24 for transmitting the result of determination by the CPU 23 to a data display 25 provided on the ground.

Here, as the angular velocity sensor 20, a piezoelectric angular velocity sensor can be used.
Is disposed substantially at the center of the inclinometer 1 so that rotation about the long axis of the inclinometer 1 is detected. A multiplexer 3 is provided between the analog signal processing unit 21 and the A / D conversion unit 22.
0 is provided.
The analog signal input to the / D conversion unit 22 is switched. That is, as shown in FIG.
The analog signal output from the analog signal processing unit 31A and subjected to the signal processing in the analog signal processing unit 31A and the analog signal output from the Y tilt sensor 3B and subjected to the signal processing in the analog signal processing unit 31B are the analog signals from the angular velocity sensor 20. Together with the input to the multiplexer 30. Then, by switching the multiplexer 30 at predetermined time intervals, switching the signal input to the A / D converter 22, and transmitting the tilt data and the data relating to the derailing to the data display 25 via the communication interface 24. It is.

Next, the operation of this embodiment will be described. Under normal conditions, the guide rollers 4A and 4B of the inclinometer 1 are connected to the casing pipe 1 as shown by the solid line in FIG.
Since the inclinometer 1 is guided by the first guide grooves 11A and 11C (11B and 11D), the inclinometer 1 is not displaced at all in the rotational direction around the long axis of the inclinometer 1. Therefore, the value of the output signal from the angular velocity sensor 20 becomes zero as shown in the section AB in FIG.

On the other hand, as shown by broken lines in FIG. 3, the guide rollers 4A and 4B
When the vehicle derails from A, 11C (11B, 11D), displacement occurs in the rotational direction with respect to the long axis of the inclinometer 1, and as a result, a signal is emitted from the angular velocity sensor 20 as shown in a section BC in FIG. The output signal is subjected to signal processing in an analog signal processing unit 21, converted into a digital signal in an A / D conversion unit 22, and input to a CPU 23. In the CPU 23, threshold processing of the input digital signal is performed. That is, the CPU 23
In, when the digital signal is larger than a predetermined threshold value Th1, the guide rollers 4A and 4B are guided by the guide grooves 11A and 11C of the casing pipe 11 (11B and 11D).
From the communication interface 2
4 to output a signal. As a result, a signal is transmitted from the communication interface 24 to the data display 25 on the ground,
In the data display 25, the guide rollers 4A, 4B
Is displayed.

The measurer can recognize that the guide rollers 4A and 4B have derailed based on the derailing information displayed on the data display 25. Therefore, it is possible to immediately stop the measurement after the derailing and perform an operation such as correcting the derailing, thereby performing the inclination measurement without measuring useless data. Also, in the device for automatically measuring the inclination, the guide roller 4 is controlled based on the signal transmitted from the communication interface 24.
It is possible to recognize the derailment of A and 4B and stop the measurement after the derailment. Therefore, invalid data is not measured after the wheel is derailed, so that the reliability of the data can be improved. In addition, when the wheel removal correction is automated, the wheel removal correction device can be operated in response to the wheel removal detection. As the derailing correction device, for example, the guide rollers 4A and 4B that are provided above the casing pipe 11 and are derailed are once removed from the casing pipe 11, and the directions of the guide rollers 4A and 4B are changed to the guide grooves 11A and 11C.
(11B, 11D) is rotated and inserted into the casing pipe 11.

In the above-described embodiment, as shown in FIG. 4, the CPU 23 performs the threshold processing based on the signal output from the angular velocity sensor 20, but as shown in FIG. A threshold value process may be performed such that the integrated value of the signal output from the sensor 20 is determined, and when the integrated value is greater than the threshold value Th2, it is determined that the wheel has been derailed. Further, the wheel derailment may be detected based on a differential value of a signal output from the angular velocity sensor 20.

In the above-described embodiment, the CPU 23 determines whether or not the wheel is released.
The output signal from 0 may be transmitted to a measuring device provided on the ground, and the CPU provided in the measuring device may determine the derailment. In addition, not only the CPU 23 but also a dedicated circuit for detecting wheel removal may be formed, and this circuit may detect the removal of the guide rollers 4A and 4B.

Furthermore, in the above embodiment, the angular velocity sensor 20 detects that the guide rollers 4A, 4B have come off, but the acceleration sensor, the acoustic sensor, or the azimuth sensor can also remove the wheel similarly to the angular velocity sensor 20. Rings can be detected. That is, when the acceleration sensor is used, the guide roller 4A is used based on the acceleration generated around the long axis of the inclinometer 1 when the acoustic sensor is used.
When the azimuth sensor is used based on the sound generated when the wheel 4B derails, the above-described threshold processing is performed based on the change in the azimuth of the inclinometer 1 due to wheel derailment, and the guide rollers 4A, 4B can be detected. Here, in the case of detecting derailing by the acceleration sensor, this acceleration sensor can be used also as the X tilt sensor 3A or the Y tilt sensor 3B, so that derailing can be detected without providing a special sensor. Thus, the configuration of the inclinometer 1 can be simplified. Further, in the above embodiment, in the case of the automatic inclination measuring device, the measurement is stopped by detecting the derailing, but the fact that the wheel has been derailed may be recorded together with the measurement data.

In the correspondence between the above embodiment and the claims, the derailing detecting section 7 constitutes detecting means.

[0019]

As described above in detail, according to the inclinometer according to the present invention, it is possible to detect that the guide roller has derailed from the guide groove. Measurement can be stopped, and thereby accurate tilt measurement can always be performed without measuring useless data.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an inclinometer according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a derailing detection unit.

FIG. 3 is a view for explaining a state of derailing.

FIG. 4 is a graph showing a detection signal of an angular velocity sensor.

FIG. 5 is a graph showing an integrated value of a detection signal of an angular velocity sensor.

FIG. 6 is a diagram showing a configuration of a conventional inclinometer.

FIG. 7 is a diagram showing a method of using an inclinometer.

FIG. 8 is a sectional view of a casing pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inclinometer 2 Probe 3A X inclination sensor 3B Y inclination sensor 4A, 4B Guide roller 6 Wire 7 Derailing detection part 10 Boring hole 11 Casing pipe 11A-11D Guide groove 20 Angular velocity sensor 21, 31A, 31B Analog signal processing part 22A / D converter 23 CPU 24 Communication interface 25 Data display 30 Multiplexer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Maeda 1 Nishinokyo Kuwaharacho, Nakagyo-ku, Kyoto Shimazu Works Sanjo Plant

Claims (1)

[Claims] 1. An inclinometer for measuring a slope in the ground by moving a guide roller in the casing pipe while guiding a guide roller to the guide groove in a casing pipe having a guide groove embedded in the ground. An inclinometer including a detection unit that detects that the guide roller has derailed from the guide groove.