JP2000149163A - Landslide detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive landslide detection device which can maintain the precision of a rotary encoder as it is and which can he installed in any simple site in terms of structure. SOLUTION: A detection device detects the extension/contraction of a wire which is to detect landslide and is stretched between two detached points A and B so that prescribed tension is maintained and it detects a landslide state. Plural pulleys 2 and 3 which rotate in proportion to the degree of extension/ contraction in accordance with the extension/contraction of the wire 1 and whose diameters differ are arranged. Rotary encoders 2A and 3A are disposed for detecting the rotation of the pulleys are installed for the respective pulleys 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detecting device for detecting a landslide (expansion and contraction of the ground) on a laid ground or a mountain road.

[0002]

2. Description of the Related Art In recent years, development of residential land and the like has been conducted nationwide, and where slopes such as mountains are created, landslides occur in the case of heavy rain during rainy season or typhoon, The landslides, as well as the places where the landslides occur, cause great damage on the downstream side.

[0003] For this reason, detection devices for detecting various types of landslides have conventionally been provided.

[0004] Specifically, as the most expensive and expensive equipment utilizing the most advanced technology, an optical distance measuring device is arranged or a detector for detecting the groundwater level is buried under the ground. Although a detection device for notifying a detection value using a satellite communication system is provided, an object to which these expensive devices can be used is only extremely limited, such as a large public utility.

[0005] Therefore, a general construction site uses a simpler and cheaper one. Specifically, a wire (or rope) is stretched between two separated points while maintaining a predetermined tension (tension), and the stretched state of the wire is rotated by an inexpensive rotary encoder via a gear mechanism. Some are configured to detect angles. That is, when the extension length of the wire becomes large and the rotary encoder rotates one or more turns, it becomes impossible to detect how many rotations the angle indicates, and thus the rotation angle is reduced by the gear mechanism to perform the detection. Make up.

However, the detection accuracy of this detection device is reduced by the amount of the gear mechanism, and the structure is complicated.

The present invention has been made in view of such a situation, and an inexpensive landslide detecting device which can maintain the accuracy of a rotary encoder as it is, is simple in structure, and can be installed at any site. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION A landslide detection device according to the present invention detects a landslide state by detecting expansion and contraction of a wire stretched so as to maintain a constant tension between two separated points to detect a landslide. A plurality of pulleys having different diameters that rotate in proportion to the degree of the expansion and contraction of the wire are arranged, and a rotary encoder is provided for each pulley to detect the rotation of the pulley. A landslide detection device, characterized in that:

However, according to the landslide detection device configured as described above, it is possible to obtain
The rotary encoder disposed on the small-diameter pulley can accurately detect a small shrinkage of the wire, and even if the rotary encoder disposed on the small-diameter pulley makes one or more rotations, the rotation can be detected with a large diameter. As a result of being able to detect the rotation speed of one or more rotations without error by the rotary encoder disposed on the pulley, the entire expansion and contraction of the wire can be detected without error and with high accuracy.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention,
In the above-mentioned invention, when the ratio of the diameter of the pulley having the second diameter to the diameter of the pulley having the next small diameter is an integral multiple, specifically, for example, the diameters are different by 10 times, respectively. Assuming that a plurality of pulleys are arranged and the rotary encoders are arranged on these pulleys, respectively, when reading sequentially from the display value of the rotary encoder arranged on the pulley having a large diameter, the degree of expansion and contraction in decimal is determined. It can also be displayed.

In another embodiment of the present invention, a pulley is provided at one of the two points for holding the wire in the groove and turning the pulley, and the tip of the turned wire is fixed to the fixed side ( (A fixed member or the like) and a weight is disposed between the turning position and the fixed position via a moving pulley. If the distance between the two points is considerably long, the wire rod However, even if it greatly expands and contracts in accordance with the long separation distance, it becomes a detection device capable of detecting correspondingly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A landslide detecting device according to one embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment.

FIG. 1 is a diagram showing a schematic configuration of a main part of a landslide detection device according to the present embodiment. In FIG. 1, reference numeral 1 denotes a wire which is a kind of a wire rod according to the present invention.
As shown in the figure, the base end of the wire 1 is fixed to a point A which is one of two separate points at which a landslide is to be detected. Then, the distal end of the wire 1 extending in the air from the point A reaches the point B, and as shown in FIG. 1, a large-diameter wire forming a part of the detection device disposed at the point B. It is held in a circumferential groove (not shown) of the pulley 2 and turned downward by the pulley 2, and its tip is fixed to a fixing member 3 at a point B, and between the pulley 2 and the fixing member 3. A moving pulley 4 having a weight 4A disposed at the lower end is suspended from the positioned wire 1. Therefore, when the wire 1 extends between the point A and the point B by, for example, 2 cm, the movable pulley 4 is lowered by 1 cm, which is a half of the length.

At a position slightly (specifically, several cm) away from the point A on the pulley 2 at the point B, the pulley 2 comes into contact with the wire 1 in a frictional contact manner. The pulley 3 comes into contact with the wire 1 so as to rotate in proportion to the amount of movement (the size of movement) due to the friction between the two (the friction between the wire 1 and the pulley 3) when moving in either of the left and right directions. It is arranged. In this case, an idle pulley may be arranged so as to face up and down above the pulley 3, and the wire may be sandwiched between the pair of upper and lower pulleys so that the wire and the pulley 3 are more reliably contacted. Good.

The pulleys 2 and 3 are provided with absolute type rotary encoders 2A and 3A for detecting the rotations (rotation angles) of the pulleys 2 and 3, respectively.

In this embodiment, the diameter of the pulley 2 is five times as large as the diameter of the pulley 3. Therefore, when the wire 1 expands and contracts (moves) by the same distance, the pulley 3 Is rotated by a rotation angle five times that of the pulley 2. Here, in this embodiment, the two pulleys 2, 3
The ratio of the diameters is 5 times.
It is desirable that the ratio be an integral multiple such as 2 times, 4 times, or 5 times. In particular, it is desirable that the ratio is 10 times in terms of decimal measurement (detection) and calculation. Also, the number of pulleys that detect the expansion and contraction of the wire 1 by arranging the rotary encoder may be two or more so that the minimum scale is 1 cm, 10 cm, and 1 m. .

As shown in the block diagram of FIG. 2, the detection unit 10 including the rotary encoders 2A and 3A is electrically connected to the control unit 5 of the landslide detection device.

The control device 5 receives data (digital signal) relating to the rotation angle from the rotary encoders 2A and 3A. The data related to the rotation angle from the rotary encoder 2A is multiplied by the diameter ratio “5”, and the value obtained by the multiplication is multiplied by the rotary encoder 13A.
Is divided by the value corresponding to one rotation angle, and only the value after the decimal point is taken out.
The calculation unit 51 performs an operation of adding data on the rotation angle from A and using the value obtained by the addition as data (observation data) on the expansion and contraction of the wire 11.
In other words, in terms of a clock, "Rotary encoder 12A"
Is configured to play the role of a short hand, and the "rotary encoder 13A" is played to play the role of a long hand, thereby expanding the measurement range and maintaining accuracy.

In the landslide detection device according to this embodiment,
In the control device 5, the arithmetic unit 51, a memory 52 for storing the data regarding the expansion and contraction, a communication unit 53 for communicating with the outside, the communication unit 53 and the arithmetic unit 51
, A call signal detecting unit 55 for detecting an external telephone call signal, a power supply (battery) 56, a communication control switch S1, and a power control switch S2.

In the case of this embodiment, the communication unit 53 uses a commercially available portable telephone. The communication unit 53 is connected to the arithmetic unit 51 via the modem 54 and a call signal detection unit 55. ing.

Therefore, the communication unit (mobile phone) is externally provided.
When a call arrives at 53, the call signal is transmitted to the operation unit 51 via the call signal detection unit 55. When the operation unit 51 detects this call signal,
The communication control switch S1 is switched to change the mode of the communication unit 53 from the reception mode to the transmission mode, and the power control switch S2 is switched to change the state of the control device 5 to the sleep state (the power consumption of the required minimum power source). From active) to active (active).

When the control unit 5 is in the operating state, the data stored in the memory 52 in the control unit 5 is transmitted to the communication unit 53 through the modem 54, and the communication unit 53 makes a telephone call. Will be sent to the other party. The data in the memory 52 may be configured to transmit all stored data, or may be configured to transmit only the latest data.

The arithmetic unit 51 sets the power control switch S2 from the sleep state to the operating state at predetermined time intervals by a timer function, fetches data from the rotary encoders 2A and 3A, and operates as described above. The arithmetic processing is performed, the processed data is sequentially stored in the memory 52, and as described above, the data is transmitted to the called party by an external telephone call. Further, an ID may be obtained from the arithmetic unit 51 after the call signal, and if the ID does not match, the communication control switch S1 and the power control switch S2 may not be switched as described above. .

Thus, according to the landslide detecting device thus constructed, as shown conceptually in FIG. 3, the wire 1 is connected between the two points A and B which are supposed to easily cause a landslide. Just place the above landslide detection device, and then simply make an appropriate (regular or non-regular) call from the outside, through the mobile base station R or as needed. It is possible to obtain data on whether or not a landslide occurs at a remote monitoring office P via a communication satellite T for use.

In addition, since the pulleys 2 and 3 having different diameters are separately arranged as described above, and the rotary encoders 2A and 3A are arranged on the pulleys 2 and 3, respectively, a large expansion and contraction range can be detected with high accuracy. It has become possible. Furthermore, as described above, since a weight acts via a moving pulley as a mechanism for applying a constant tension to the wire 1, it is possible to cope with a considerably large expansion and contraction width.

In addition to the above-described embodiment, the control device 5 of the detection device is configured to detect a change in expansion and contraction at the time of each data storage, for example, by an arithmetic device. In such a case, for example, in a case where a landslide may occur in a stretched state, the detection device may automatically communicate with an external management office P. Alternatively, such a function may be further added to the configuration of the above embodiment.

[0027]

Since the landslide detection device according to the present invention is constructed as described above, the accuracy of the rotary encoder can be maintained as it is, and the structure is simple and can be installed at any site. It becomes an inexpensive landslide detection device.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a main part of a landslide detection device according to an embodiment;

FIG. 2 is a block diagram illustrating a schematic overall configuration of a landslide detection device according to the embodiment;

FIG. 3 is a conceptual diagram modeling and representing a use mode of the landslide detection device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wire (wire material) 2 ... Pulley (large diameter pulley) 2A ... Rotary encoder 3 ... Pulley (small diameter pulley) 3A ... Rotary encoder

Claims (3)

[Claims] 1. A detecting device for detecting a landslide state by detecting expansion and contraction of a wire stretched so as to maintain a constant tension between two points separated from each other to detect a landslide. A landslide detection device comprising: a plurality of pulleys having different diameters that rotate in proportion to the degree of expansion and contraction; and a rotary encoder disposed on each pulley to detect the rotation of the pulley. 2. The landslide detection device according to claim 1, wherein the ratio of the diameter of the pulley having the next smaller diameter to the diameter of the pulley having the smaller diameter is an integral multiple. 3. A pulley for holding and turning the wire in a groove is provided at one of the two points, and the tip of the turned wire is fixed to a fixed side and the turning position and The landslide detection device according to claim 1 or 2, wherein a weight is disposed between the fixed position and the fixed position via a moving pulley.