JP2000329548A - Apparatus for measuring displacement of earth's surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a measuring apparatus which eliminates labor to replace a sheet of recording paper and which easily acquires measured data when the displacement amount of the earth's surface due to a landslide or the like is measured. SOLUTION: A body part 11 which is installed in a fixation point E1 on the earth's surface E is constituted of a measuring part 12 which is composed of a variable resistor and a detection circuit. In addition, the body part is constituted of a data transfer part 13 which is composed of an A/D conversion circuit, a data transfer processing part and a memory, An invar wire 16 is stretched between the body part 11 and a fixation point E2. A change in the length of the invar wire 16 according to the displacement of the earth's surface is detected by the variable resistor so as to be converted into an electric signal, and the electric signal is transmitted to the side of a communication apparatus 24 as a radio signal. When the electric signal cannot be transmitted it is stored inside the memory. Thereby, measured data can be acquired from a distant place and, in addition, the measured data can be acquired continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a wire is stretched between a fixed point of a displacement measurement target point on the ground surface and a measurement point, and a change in the length of the wire is detected on the measurement point side. The present invention relates to a ground surface displacement measuring device configured to measure a displacement between the surface and the fixed point.

[0002]

2. Description of the Related Art FIGS. 11 and 12 show examples of this type of ground surface displacement measuring apparatus. FIG.
1 shows a schematic configuration, in which a measuring device main body 1 is covered with a cover 2 and the whole is fixed at a measuring point E on a ground surface E by a fixed pile 3.
Fixed to 1. A wire 4 for displacement measurement is drawn out from the measuring device main body 1, and the distal end thereof is fixed to a fixed pile 5. With respect to the fixed pile 3, the fixed pile 5 is fixed to a fixed point E2 on the other end of the section for measuring the displacement of the ground surface E.

As shown in FIG. 12, a main body 1 of a measuring instrument is provided with a rotatably supported drum 6, and a wire 4 is wound around a pulley 6a provided at one end thereof. A weight 7 is suspended from the tip. The weight 7 is
It is arranged in a state covered by the protective tube 8 so as not to be shaken by wind or the like. The recording paper P is wound around the drum 6, and a pen holding unit 9 is provided so that the pen 9 a records on the recording paper P. Pen 9a
Is adjusted to move at a constant speed from one end of the recording paper P to the other end thereof in the unit of one week or one month (moving direction indicated by an arrow in the figure), and the rotational state of the drum 6, that is, the ground surface Is recorded.

[0004] With this configuration, when a displacement occurs on the ground surface between the fixed piles 3 and 5, the wire 4 is pulled toward the fixed pile 5 side, so that the drum 6 is rotated. As a result, a displacement corresponding to the rotation amount is recorded on the recording paper P by the pen 9a. Pen 9
If the movement setting speed a is set to one week or one month, the measurement can be continuously performed by replacing the recording paper P each time the period comes.

[0005] Although not shown, there is also a configuration having an alarm function. When the amount of rotation of the drum 6, that is, the amount of displacement of the ground surface is equal to or more than a predetermined amount, the alarm function is activated and an abnormal state is established. To encourage outbreaks. Thus, the amount of displacement of the ground surface can be continuously measured, and when an abnormality occurs, it can be quickly transmitted to a remote place by an alarm function.

[0006]

However, the conventional configuration described above is inconvenient in terms of the following points, and involves inconvenience in practical use. That is, in a normal case, a place where such a ground surface displacement measuring device is installed is a place where there is a high possibility that a landslide, a landslide or a rock fall will occur, thereby causing a distortion on the ground surface. Therefore, the installation environment is also a dangerous place, and it is often dangerous to approach and replace the recording paper. Further, when such a ground surface displacement measuring device is provided in a large number of places where a landslide or the like is expected to occur, there is a problem that it takes a lot of trouble to exchange the recording paper.

Furthermore, when the displacement of the ground surface is very small,
When performing continuous measurement, it is inconvenient because the recorded data cannot be obtained unless the measurement device main body 1 is installed, and when the state of the pen 9a is deteriorated, the recorded data itself is lost. There is a defect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to make it easy to collect recorded data, and to make it possible to obtain recorded data even from a remote location remote from the installation location. An object of the present invention is to provide a displacement measuring device.

[0009]

According to a first aspect of the present invention, there is provided an apparatus for measuring the displacement of a ground surface, wherein a wire is stretched between a fixed point of a place to be measured for displacement on the ground surface and a measuring point, and the wire is disposed on the measuring point side. It is intended for a ground surface displacement measuring device which detects a change amount of the length of the wire and measures a displacement between the fixed point on the ground surface and a change amount of the wire length. A variable resistor that converts the resistance value into an amount and changes the resistance value in accordance with the rotation angle; a detection unit that detects the resistance value of the variable resistor as an electric signal and obtains the displacement amount of the ground surface; And a data transfer means for transmitting the data of the displacement amount of the ground surface detected as described above as a wireless signal.

[0010] With the above structure, if the ground surface is displaced due to, for example, landslides, landslides or falling rocks, the distance between the fixed point and the measuring point fluctuates and the wire length changes. . The amount of change in the length of this wire is
It is converted as a change in the resistance value of the variable resistor, and furthermore, the change amount of the resistance value can be obtained as a change amount of the electric signal by the detection unit, and the displacement amount of the ground surface can be obtained as an electric signal with this. Can be. Then, since the data of the displacement amount of the ground surface is transmitted as a wireless signal by the data transfer means, it is possible to acquire the measurement data from a safe place even when the apparatus is installed in a remote place, and to obtain the data as a wireless signal. Therefore, processing operations can be performed easily and quickly in data processing.

According to a second aspect of the present invention, there is provided a ground displacement measuring apparatus,
The above configuration is characterized in that a storage means capable of storing the displacement amount of the ground surface as measurement data is provided. Accordingly, even when there is no transmission partner when transmitting the measurement data, the measurement data can be recorded and held, so that it is possible to secure the measurement data in the continuous measurement.

According to a third aspect of the present invention, there is provided a ground surface displacement measuring device.
In the above configuration, when the data of the amount of displacement of the ground surface is detected by the detection unit, the data transmission unit transmits the data as a radio signal when there is a partner to which the data is to be transmitted, and when the data does not exist, the storage unit transmits the data. This is characterized in that it is configured to be stored in a memory.

Thus, if there is a partner to which the measurement data of the displacement amount of the ground surface is to be transmitted, the data is transmitted, and if not, the measurement data which cannot be transmitted is stored and held in the storage means. Even when an inconvenience occurs in the communication state of a wireless device or the like, the measurement data is retained without being lost, and cannot be received by requesting transmission of unarrived measurement data in a state where communication is possible. Can be obtained while staying in a remote place.

According to a fourth aspect of the present invention, in the ground displacement measuring apparatus, the data transfer means stores the data of the displacement amount of the ground surface detected by the detecting unit in the storage means. The present invention is characterized in that past data is also transmitted as a wireless signal. As a result, even in the case described above, measurement data that has not arrived from the receiving side can be automatically obtained without transmitting a request signal, and even if the communication state is unstable, the adverse effect is exerted. Measurement data can be obtained continuously without the need.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to a landslide measuring device will be described below with reference to FIGS. FIG. 1 schematically shows the entire configuration, in which a main unit 11 is provided with a measuring unit 12 and a data transfer unit 13, and these are entirely covered with a protective cover 14. The main body 11 is fixed to the measurement point E1, which is one end of the measurement area on the ground surface, by the fixing pile 15. From the measuring section 12, an invar wire 16 as a measuring wire is drawn out. The invar wire 16 is a wire mainly composed of invar material, has a small coefficient of linear expansion, has very little expansion and contraction in the range of the degree of temperature fluctuation, and has a negligible error caused by expansion and contraction due to fluctuations in the outside air temperature throughout the four seasons. belongs to. A mounting bracket 16a (see FIG. 3) is attached to the tip of the invar wire 16, and is fixed to a fixed point E2 on the ground surface by a fixed pile 17. Measuring unit 1
2 detects a change in the length of the invar line 16 to detect a displacement amount of the ground surface, and the data transfer unit 13 converts the measurement data into a radio signal and transmits the radio signal to the outside, or as described later. It is designed to be stored internally.

Next, the electrical configuration of the main body 11 will be described. FIG. 2 shows a block configuration of the measuring unit 12.
Is a variable resistor 18 and a detection circuit 19 as a detection unit.
It is composed of Here, the variable resistor 18 uses, for example, one developed for measuring a traveling distance by an excavating machine such as a tunnel (for example, CPP-45-150LS manufactured by Green Measurement Co., Ltd.), FIG.
The appearance is as shown in FIG.

The variable resistor 18 has a structure in which a planetary gear case and a CPP-45 are incorporated in an aluminum case. It is configured so that it can be bridged without looseness by applying a force to the drawing side, and is fixed to the fixed pile 17 by the mounting bracket 16a at the tip.

When the length of the invar line 16 is extended to a predetermined length S or more, the resistance value changes in proportion to the length of the extended line (see FIG. 4). . When a predetermined voltage is applied from the outside via the cable 18a, a voltage signal proportional to the lead length of S or more is output from the cable 18a. FIG. 4 shows the relationship between the output voltage ratio (%) and the pull-out length in the pulling direction, and is proportional to the pull-out length S or more.

The detection circuit 19 is configured to detect a voltage signal output from the variable resistor 18 as a change amount of the length of the invar line 16, that is, a displacement amount of the ground surface. This is to obtain measurement data of the amount of change in the surface. The data transfer unit 13 includes an A / D conversion circuit 20, a data transfer processing unit 21, and a memory 22. The data transfer processing section 21 is mainly composed of a microcomputer and is composed of a circuit composed of a ROM, a RAM, and the like, and programs of a main routine and a storage processing routine to be described later are stored in advance.

The data transfer processing section 21 converts the measurement data given from the detection circuit 19 into an A / D conversion circuit 20.
According to the situation at that time, when the data that has been converted into digital data is fetched through the memory, the process of storing the converted data in the memory 22 as a storage means and the process of transmitting the data as a wireless signal to the outside via the antenna 21a It is configured to determine and execute. The wireless communication function of the data transfer processing unit 21 includes, for example, a communication circuit that employs a spread spectrum communication method, but is not limited to this wireless communication method, and may also be configured by incorporating a general wireless communication circuit. be able to. In a communication system with a high frequency such as a spread spectrum communication system, the transmission capacity that can be transmitted is high, so that it is suitable when the amount of measurement data to be processed is large.

The memory 22 employs a nonvolatile memory such as an EEPROM, for example, but is not limited to this, and a memory such as a RAM that is backed up by a battery or the like may be used. And the storage capacity of the memory 22 is:
For example, about 4 Mbytes (actually, 4,194,304
Bytes). This is because one measurement data is 3
Assuming that you measure once a second in bytes,
That is, about 139,000 measurements can be performed in total, and the capacity is such that measurement data for about 16 days can be stored.

The above-mentioned landslide measuring instrument is arranged at a place where it is predicted that a landslide is likely to occur, as shown in FIG. 5, for example. The measurement is performed by arranging between two points E1 (measurement point) and E2 (fixed point) on the ground surface E. In this case, usually, in order to prevent erroneous detection due to the wind or the like blowing and the Invar wire 16 bending or swinging, a cover member 23 for wind protection of the Invar wire 16 is provided in the installed state. Has become.

On the other hand, as a device for receiving the measurement data transmitted from the data transfer unit 13 and processing the data, for example, as shown in FIG. 1, a communication device 24 and a personal computer for data processing are used. 25 can be provided. The personal computer 25 and the communication device 24 may be configured integrally, or may be separated as illustrated. Further, as a device that can carry the personal computer 25 and the communication device 24, data may be transmitted / received at a position close to the environment where the landslide measuring device is installed.

Next, the operation of this embodiment will be described.
The measurement principle will be briefly described with reference to FIG. FIG.
Is a diagram showing displacement before and after the occurrence of a landslide at the time of measurement in the installation environment as shown in FIG. 5, where the ground is located between the measurement point E1 and the fixed point E2 (the length L of the invar line 16). Surface E
It is assumed that the fixed point E2 is displaced from the position indicated by the two-dot chain line in FIG. Thus, when the length of the invar line 16 is increased by ΔL, the entire length is L + ΔL.

Then, the variable resistor 18 of the measuring section 12 is pulled out by pulling the invar wire 16,
The resistance value changes by an amount corresponding to the length of ΔL, and as a result, the voltage signal changes by ΔV. The detection circuit 19 outputs the measurement data corresponding to the displacement amount of the invar line 16, that is, the displacement amount ΔL due to the landslide by detecting the change ΔV of the voltage signal.

Next, in the data transfer section 13, the data transfer processing section 21 performs processing for storing measurement data and processing for data transmission in accordance with the flowcharts of the programs shown in FIGS. The data transfer processing unit 21 converts the measurement data output from the detection circuit 19 at a predetermined frequency (for example, about once every second)
The data is sampled via the / D converter 20 and taken in as measurement data converted into a digital signal.

This is performed as an interrupt processing routine shown in FIG. 8. When a program is started by an interrupt, the data transfer processing unit 21 fetches the measured data into the memory 22 (step T1) and stores it in the memory 22. The data is stored (step T2). In this case, the measurement data is data having a 3-byte length as described above. Thereafter, the data transfer processing unit 21 increments the counter of the number of measurement data by "1" (step T3) and returns to the main program.

On the other hand, in the main program, the data transfer processing section 21 executes processing according to the main program of FIG. That is, first, it is determined whether or not there is measurement data (step S1). When the measurement data remains in the memory 22, a search is made for a transmission partner to transmit the measurement data in the memory 22 (step S1). Step S2). At this time, if the communication device 24 connected to the personal computer 25 exists as described above, it is determined that there is a communication partner (step S3), and the measurement data in the memory 22 is wirelessly transmitted to the communication device 24. It is transmitted as a signal (step S4). Thereafter, the data transfer processing unit 21
Decrements the counter of the number of measurement data by "1" and returns to step S1.

Thereafter, the above steps S1 to S5 are repeatedly executed, and when all the measurement data stored in the memory 22 has been transmitted, the process stands by until the next measurement data is generated (step S1). . If there is no other party to which the measurement data is to be transmitted, “NO” is determined in step S3 described above, and the process returns to step S1. Thereafter, every time measurement data is generated, a transmission destination is searched for. (Step S2).

Such a situation will be briefly described with reference to FIGS. On the landslide measurement device side (measuring device side), a signal for searching for a transmission partner is transmitted as a wireless signal regardless of whether a transmission partner exists. When there is a transmission partner, a response signal is returned from the communication device 24 as the transmission partner as shown in FIG.
The data transfer processing unit 21 transmits the measurement data in response thereto, and when the transmission of the measurement data ends and a completion signal is received from the communication device 24 side, the communication processing is completed.

When there is no transmission partner of the measurement data, as shown in FIG.
Will repeat the above steps S1 to S3,
During this time, since no response signal is obtained, the measurement data is stored in the memory 22. When a large number of measurement data are stored in the memory 22 and a transmission partner is present, the measurement data is sequentially transmitted to the communication device 24 as described above. Transmission is performed continuously until there is no more measurement data.

The measurement data received via the communication device 24 as described above is used in the personal computer 25 by restoring it in a time-series manner or by rearranging it according to a certain processing method. Then, various data processing such as analysis of a landslide occurrence situation and a tendency of displacement is performed.

When there is an abnormality in the measurement data taken by the personal computer 25 in this way, that is, when the amount of displacement of the ground surface is more than a predetermined level and landslide, landslide or falling rock is expected to occur. Can perform an alarm process assuming that an abnormal condition has occurred, so that measures and countermeasures for minimizing the occurrence of an accident or the like can be quickly performed.

According to the present embodiment, the measuring section 1
2, a variable resistor 18 is provided, the displacement amount of the ground surface is extracted as an electric signal, and this is stored in the memory 22 by the data transfer processing unit 13 and transmitted to the communication device 24. Since there is no need to go to the installation location and replace paper or the like, it is possible to obtain measurement data in real time from the remote location via the communication device 24, and furthermore, it is possible to obtain it as an electrical signal.
The data processing can be performed easily and quickly.
When communication with the communication device 24 is not possible, the measurement data can be stored in the memory 22.
When the communication is enabled, the measurement data stored in the memory 22 can be sequentially received, so that the measurement data can be continuously obtained without being affected by the communication condition.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The memory 22 can be provided as needed, and its capacity can be appropriately set. Alternatively, the memory 22 may be configured as a removable storage medium such as an IC card and used as a backup for guaranteeing measurement data.

The data transfer processing section 21 is not limited to the spread spectrum communication method, and can be implemented by a communication function using a normal FM modulation method, AM modulation method, or another modulation method. A dedicated alarm device may be provided so that an alarm operation is performed when the value of the measured data exceeds the abnormality determination level.

[0037]

As described above, the ground displacement measuring apparatus according to the present invention has the following advantages. That is, according to the first aspect of the present invention, the amount of change in the length of the wire is converted as a change in the resistance value of the variable resistor to obtain the amount of change in the electric signal, and the measurement data is transmitted as a wireless signal. With this configuration, measurement data can be obtained from a safe place even when it is installed in a remote place, and can be obtained as a wireless signal, so that data processing can be performed easily and quickly. It has an excellent effect that it can be performed.

According to the second aspect of the present invention, the storage means capable of storing the amount of displacement of the ground surface as measurement data is provided.
Even when there is no transmission partner when transmitting the measurement data, the measurement data can be recorded and held, and an excellent effect that the measurement data can be secured in the continuous measurement can be obtained.

According to the third aspect of the present invention, the data transfer means is transmitted as a radio signal when there is a partner to which the measurement data is to be transmitted, and is stored in the storage means when there is no other party. Even if an inconvenience occurs, the measurement data is retained without loss, and by requesting the transmission of unarrived measurement data in a state where communication is possible, the measurement data that could not be received can be transferred to a remote location. It has an excellent effect that it can be obtained while staying at the same location.

According to the fourth aspect of the present invention, the data transfer means is configured to transmit the past data stored in the storage means as a radio signal when there is a partner to transmit the measurement data. It is possible to automatically obtain measurement data that has not arrived from the receiving side without sending a request signal, and to continuously obtain measurement data without being adversely affected even when the communication state is unstable. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an overall configuration showing an embodiment of the present invention.

FIG. 2 is a block diagram of an electric configuration of a main body.

FIG. 3 is a schematic perspective view of a variable resistor.

FIG. 4 is an output characteristic diagram of a variable resistor.

FIG. 5 is an external perspective view showing an installed state.

FIG. 6 is a side view for explaining the measurement principle.

FIG. 7 is a flowchart of a main routine.

FIG. 8 is a flowchart of a storage processing routine.

FIG. 9 is a diagram illustrating a communication procedure when a transmission partner exists.

FIG. 10 is a diagram corresponding to FIG. 9 when there is no transmission partner;

FIG. 11 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 12 is a perspective view showing an internal configuration of a measuring instrument main body.

[Explanation of symbols]

11 is a main unit, 12 is a measuring unit, 13 is a data transfer unit, 1
6 is an invar wire (wire), 18 is a variable resistor, 19 is a detection circuit (detection unit), 20 is an A / D conversion circuit, 21 is a data transfer processing unit (data transfer unit), and 22 is a memory (storage unit). , 24 are communication devices, and 25 is a personal computer.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takahiro Sugiura 1st, Kitayama, Hashime-cho, Okazaki City, Aichi Prefecture Inside (72) Inventor Tsutomu Tada 1st Kitayama, Hashime-cho, Okazaki City, Aichi Prefecture Inside Maruyasu Industry Co., Ltd. 72) Inventor Kiyoshi Nishio 1349 Higashitsuda-cho, Matsue-shi, Shimane F-term in Synch Fuji Co., Ltd. (Reference) 2F076 BA11 BB09 BD17 BE01 BE04 BE05 BE16 BE18

Claims (4)

[Claims] 1. A wire is stretched between a fixed point of a displacement measurement target point on the ground surface and a measurement point, and an amount of change in the length of the wire is detected on the measurement point side to detect the displacement of the wire on the ground surface. In the ground surface displacement measuring device that is configured to measure the displacement during, a variable resistor that converts the change amount of the length of the wire into a change amount of the rotation angle and changes the resistance value according to the rotation angle, A detection unit for detecting the resistance value of the variable resistor as an electric signal to obtain the displacement amount of the ground surface, and a data transfer for transmitting data of the displacement amount of the ground surface detected by the detection unit as a wireless signal And a means for measuring ground displacement. 2. The ground surface displacement measuring device according to claim 1, further comprising a storage unit capable of storing the amount of displacement of the ground surface as measurement data. 3. The ground displacement measuring device according to claim 2, wherein the data transfer means includes a counterpart to which the data is transferred when the detection unit detects data on the amount of displacement of the ground surface. The ground surface displacement measuring device is configured to be transmitted as a radio signal when it is performed, and to be stored in the storage unit when it is not present. 4. The ground surface displacement measuring device according to claim 3, wherein the data transfer unit is configured to store the data of the displacement amount of the ground surface detected by the detection unit when there is a partner to transmit the data. Characterized in that it is configured to transmit also past data stored in the device as a wireless signal.