JP3706897B2 - Detection device using a tubular switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a detection device using a tube-shaped switch, and more particularly to a detection device suitable for detecting a falling rock or a debris flow.
[0002]
[Prior art]
The tube-shaped switch has a structure in which two bare wires are spirally arranged opposite to each other inside a flexible tube. If the tube is crushed for some reason, these two bare wires are short-circuited. This is to detect the cause of crushing, for example, the intrusion of a car or the like, a rockfall accident, and the like. The present inventor has made various proposals regarding the structure and use of such a tubular switch (for example, International Application Publication No. WO98 / 01875).
[0003]
On the other hand, in order to minimize damage by detecting disasters caused by debris flows after volcanic eruptions in recent years, landslides caused by heavy rains and earthquakes, and rockfall disasters in advance, the early signs are detected. Various methods have been studied and tried by the Ministry of Land, Infrastructure, Transport and Tourism. For example, research is being conducted on various methods, such as an image monitoring system that captures slight changes in the surveillance image of a TV camera, and a method that detects changes in terrain and debris flow by capturing changes in the stress and deformation of optical fibers and wires or capacitance. Have been developed.
[0004]
However, all of these methods require expensive equipment and advanced construction and maintenance techniques, and are currently difficult to put into practical use due to their economical efficiency. On the other hand, the tubular switch described above uses the characteristics of such a tubular switch because the inner wire crosses the contact and energizes the contact to demonstrate the sensor function, regardless of which part of the tube is crushed. Attempts have been made to develop a system that detects debris flow and falling rocks.
[0005]
[Problems to be solved by the invention]
By the way, in order for the tube-shaped switch to be crushed, the tube-shaped switch needs to receive an external force that is sandwiched or bent between hard and hard materials. When it is used, the laying site is not necessarily a flat road, but is a cliff, a slope of a mountain or the like. Moreover, since the tube-like switch itself is narrow, even if there is a rock fall, it does not necessarily hit the tube-like switch, and it is difficult to detect at the initial stage of the rock fall. In order to make rock fall easy to hit, if you build a fence that receives rock fall on the slope and install it there, the probability of detecting rock fall increases, but the dredge will also catch earth and sand. There is also a problem of destruction.
[0006]
Then, an object of this invention is to provide the detection apparatus which can detect a falling rock, a debris flow, etc. reliably, without clogging rainwater or earth and sand. It is another object of the present invention to provide a detection device that is easy to construct and can be laid at low cost even on dangerous slopes with poor scaffolding.
[0007]
[Means for Solving the Problems]
The detection device of the present invention that achieves the above object has a pair of conductive members arranged in a non-contact state along the longitudinal direction of the tube in a flexible tube, and the pair of conductive members are brought into contact with each other. A tube-shaped switch for detecting an external force applied to the tube, two wires arranged in parallel at intervals on both sides of the tube-shaped switch, and a pair of wires wound spirally and intersecting each other at every pitch of the spiral The pair of wire rods sandwich the tube-like switch at the intersecting portion, and the wires penetrate through the inside of the spiral.
[0008]
According to the detection device of the present invention, by adopting a configuration in which the tubular switch is sandwiched between a pair of wires, an external force applied to the tubular switch can be reliably detected in a wider range than the tubular switch. In addition, since there is a gap between the elements constituting the portion for detecting the external force, there is no possibility that dirt or the like will stay or the detector may be damaged. Furthermore, the detection apparatus of the present invention can constitute a detection system for falling rocks, earth and sand disasters, etc., without using an advanced system, by using a tube-shaped switch.
[0009]
The detection device of the present invention is a detection device in which a plurality of the detection devices described above are arranged in parallel in the width direction, wherein one detection device and a detection device adjacent to the detection device share one wire. To do. This detection device is obtained by expanding a detection device composed of a tubular switch and two wires in the width direction, whereby a detection device having a wide sensing range can be obtained.
[0010]
Furthermore, the detection device of the present invention is a detection device composed of a tube-shaped switch and two wires, apart from the two wires, intersects one of a pair of wires at a plurality of locations, and the outside of the one wire With another wire overhanging. In addition to the wire for fixing the detection device, this detection device can further widen the detection range of a single tubular switch by providing a wire extending outward.
[0011]
The detection device of the present invention further includes a detection circuit that is connected to the pair of conductive members of the tube-shaped switch and detects conduction in the tube-shaped switch, and an alarm circuit that issues an alarm according to the output of the detection circuit. It is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a detection apparatus of the present invention will be described with reference to the drawings.
[0013]
1A and 1B are diagrams showing an embodiment of the detection device of the present invention, where FIG. 1A is a plan view and FIG. 1B is an end view. As shown in the figure, the detection device includes one tubular switch 10, two wire ropes 20a and 20b arranged in parallel on both sides of the tubular switch 10, and the tubular switch 10 and each wire rope. It consists of two lashing rods 30a and 30b wound spirally around 20a and 20b. The lashing rods 30a and 30b cross each other to form a twist, and the tubular switch 10 passes through the twisted portion. Thereby, the tubular switch 10 is sandwiched and supported by the two lashing rods 30a and 30b.
[0014]
For example, as shown in FIG. 2, the tubular switch 10 includes a pair of conductive members 12 fixed to the inner surface of a flexible tube member 11 so that a part thereof is exposed to the internal space, and the conductive member 12. And a detection circuit 13 connected to the. The pair of conductive members 12 may be in any shape that can maintain a non-contact state with each other. For example, one may be asymmetric such that one is a wire and the other is a planar shape. A wire rod that is helically fixed to the inner surface of the tube member is preferable in terms of operational reliability. When the tube member 11 receives an external force and is crushed or deformed, the pair of conductive members 12 are in contact with each other to form a closed circuit that connects the detection circuit 13 and the pair of conductive members 12. It can be detected that 11 has received an external force, for example, it has been crushed by falling rocks or the like. Further, since the circuit resistance changes depending on the distance from the detection circuit 13 to the contact portion, it is possible to detect the distance to the contact portion, that is, the place where the external force is received. The configuration of the detection circuit 13 will be described later.
[0015]
The wire ropes 20a and 20b are for urging the lashing rods 30a and 30b in directions away from each other. For example, the lashing rods 30a, 30b are urged away from each other by pulling the wire rope to both sides and fixed to standing trees, rocks, steel poles, etc. of the laying place, thereby lashing rods 30a, 30b The tube-like switch 10 sandwiched between is in a state of being sandwiched with a strong force.
[0016]
The lashing rods 30a and 30b are widely used in the electric construction industry as members for holding electric wires in the air. As shown in FIG. 3, a helical hard steel wire is covered with a resin. ing. Such lashing rods 30a and 30b intersect each other at each pitch of the spiral, and the tubular switch 10 passes through the intersecting portion, thereby sandwiching the tubular switch 10. . As described above, since the lashing rods 30a and 30b are urged away from each other by the wire rope, when the lashing rods 30a and 30b receive an external force, an external force is applied to the tubular switch 10 between them. Can be operated. That is, the lashing rods 30a and 30b widen the detection range of the tubular switch 10 and ensure a reliable operation.
[0017]
An example of the detection circuit 13 of the tubular switch 10 is shown in FIG. This detection circuit 13 includes a power supply unit 31, a constant current circuit 32 that supplies a constant current to the tubular switch 10, a differential amplifier 33 and a filter circuit 34 that detect a voltage (resistance) when the switch is turned on, and position information Comparison circuits 35-1, 35-2, 35-3 and alarm output relays 36-1, 36-2, 36-3 for detecting disconnection information and the number of ON times, position data, frequency data, etc. are displayed. A display 37 or the like is provided. One conductive member 12 of the tubular switch 10 is connected to a constant current circuit 32, and the other conductive member 12 is connected to a differential amplifier 33. Further, although not shown in the figure, the end of the tubular switch 10 opposite to the power input section side is connected to a pair of conductive members via a large resistor, and the tubular switch 10 is used as a closed circuit. A weak current is always flowing.
[0018]
In such a configuration, when the circuit is closed by the conduction of the pair of conductive members 12 of the tubular switch 10, the voltage detected by the differential amplifier 33 is the distance set in advance by the comparison circuit 35-1. The alarm output relay 36-1 is turned on and the position data is sent to the display 37 and an external alarm device via the 4-20 mA conversion circuit. Further, as described above, a weak current always flows through the tubular switch 10, but when the conductive member 12 is disconnected, the resistance becomes infinite, and the voltage detected by the differential amplifier 33 is the maximum. Become. The comparison circuit 35-2 detects that the voltage is maximum, turns on the alarm output relay 36-2, and sends disconnection data to an external alarm device. The comparison circuit 35-3 detects the ON state of the switch and counts the number of times in the counter circuit, and displays it on the display 37.
[0019]
An alarm device, siren, sound, lighting, etc. are used to notify the occurrence of a disaster, and are usually installed at a remote location such as a monitoring center away from the detector main body. Transmission of the signal from the detection circuit 13 to the alarm device can be performed wirelessly in addition to transmission using electric wires or optical fibers.
[0020]
Next, the operation of the detection device having such a configuration will be described.
[0021]
For example, as shown in FIG. 4, the detection device of the present embodiment is laid by fixing wire ropes 20 a and 20 b to poles 41 and 42 erected on a slope of a mountain. At this time, an appropriate tension is applied to both ends of the wire ropes 20a and 20b, and the lashing rods 30a and 30b are fixed so as to be urged away. The height H from the ground to the lower end of the detection device can be appropriately adjusted in consideration of the topography, the detection range, and the like.
[0022]
In this state, when dirt or the like hits the lashing rod 30a, the lashing rod 30a tries to turn around the wire rope 20a, and similarly, the lashing rod 30b tries to turn around the wire rope 20b. The tube-like switch 10 is crushed by such symmetrical movements of the lashing rods 30a, 30b, the internal conductive member 12 is conducted, and the detection circuit 13 detects the falling rock and the falling rock location. When the detection circuit 13 detects a falling rock, the signal is transmitted to an alarm device, and an alarm by a siren, voice, etc. is issued.
[0023]
According to the detection device of the present embodiment, the tubular switch is operated by using the turning force of the pair of lashing rods that sandwich the tubular switch, so that the tubular switch can be operated reliably. . Moreover, the detection target load range can be set by appropriately selecting the hardness of the tube-shaped switch (the thickness of the tube member, the hardness of the material, the diameter, etc.). Furthermore, since the range which a tubular switch detects can be extended to the range where a lashing rod exists, the probability of a detection can be raised. Since the tension of the wire rope does not give a burden to the tube-like switch or the lashing rod, the length of the detection device can be designed to be arbitrarily long within the range of the tensile strength of the wire rope. Further, since each element constituting the detection device is made of a wire rod and there are many gaps between the elements, rainwater, earth and sand, etc. can pass therethrough, so that there is little possibility of sediment accumulation and damage to the detection device.
[0024]
Although FIG. 4 shows the case where the detection device of the present invention is installed horizontally with respect to the slope, it can be installed in a combination of vertical, diagonal, and various directions depending on the terrain and disasters that are likely to occur. It is also possible to provide multiple stages from the upstream to the downstream of slopes, cliffs, sabo dams, etc., and detect how far debris has accumulated.
[0025]
Next, a second embodiment of the present invention will be described. FIG. 5 is an enlarged view of the detection range by extending the detection device of FIG. 1 in the width direction.
[0026]
That is, the detection device of the present embodiment uses the detection device of FIG. 1 as a unit, and shares one wire rope 20b of one detection device unit with the other wire rope 20a of the detection device unit adjacent thereto, It has a structure in which wire ropes and tubular switches 10 are alternately arranged. In the detection device having such a structure, for example, by arranging a plurality of tube-like switches 10 at the intersection of a pair of lashing rods 30 that intersect each other, a single wire rope is passed through both adjacent lashing rods. Can be manufactured. The number of detection device units can be arbitrarily changed according to the size and application of the laying place, and thus a detection device having a desired size can be configured.
[0027]
The detection device of this embodiment can also be laid by fixing the wire rope to standing trees, rocks, poles or the like at the laying place, as in the detection device of FIG. By turning, the tubular switch 10 is reliably crushed, and falling rocks can be detected.
[0028]
FIG. 6 is a diagram showing still another embodiment of the present invention, in which the sensing range of the sensing device shown in FIG. 1 is expanded. That is, in this embodiment, another spiral rope, for example, every one or two revolutions, passes through another wire rope 20c to the lashing rod 30b of the detection device, hangs down, and further to the lower end of the wire rope 20c. It is through another wire rope 20d.
[0029]
The detection device of this embodiment is installed on the slope so that the part where the wire rope 20c hangs down. When the wire rope 20c is pulled by falling rocks or earth and sand from above, the lashing rod 30b through which the wire rope 20c is passed is pulled, and the tubular switch 10 is turned on. In this embodiment, a relatively wide range can be covered with one detection device.
[0030]
As mentioned above, although the detection apparatus of this invention was demonstrated based on embodiment shown in drawing, this invention is not limited to these embodiment, A various change is possible. For example, in the figure, the lashing rod shows a crossing portion that sandwiches the tubular switch for each pitch, and the finer the crossing portion pitch, the higher the positional accuracy of detection, but the tube in the crossing portion The case where there is a portion where the switch is not sandwiched or the pitch of the intersection is different is also included in the scope of the present invention.
[0031]
Any wire rod or lashing rod can be used as long as it has a similar function. For tube switches, not only those with two bare wires spirally arranged in the tube, but generally any switches that are tube-shaped and that turn on when the internal conductive members come into contact when external force is applied. can do.
[0032]
Furthermore, although the case where the detection device of the present invention is applied as a detection device for falling rocks, debris flow, etc. has been described in the above embodiment, the detection device of the present invention is not limited to such natural disasters. It can also be used as a security sensor by installing it at the entrance of a parking lot.
[0033]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the detection system which can detect generation | occurrence | production of a falling rock and a debris flow simply and reliably is provided by utilizing a tubular switch. Further, according to the present invention, the length and width of the detection device can be arbitrarily designed, and the laying direction can be freely selected, so that appropriate laying can be performed in response to various disasters and accidents.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a detection device of the present invention. FIG. 2 is a diagram showing an example of a tube-like switch employed by the detection device of the present invention. FIG. 4 is a diagram showing a laying example of the detection device of FIG. 1. FIG. 5 is a diagram showing another embodiment of the detection device of the present invention. FIG. 6 is another embodiment of the detection device of the present invention. Figure [Explanation of symbols]
10 ... Tubular switch, 11 ... Tube, 12 ... Conductive member, 13 ... Detection circuit, 20 (20a, 20b) ... Wire rope, 30 (30a, 30b) ... Lashing rod

Claims (4)

A tube-like switch that has a pair of conductive members arranged in a non-contact state along the longitudinal direction of the tube in a flexible tube, and detects an external force applied to the tube by contact between the pair of conductive members; Two wires arranged in parallel at intervals on both sides of the tubular switch, and a pair of wires wound spirally and intersecting each other at each helical pitch, the pair of wires are The tube-shaped switch is sandwiched between the portions, and the wires pass through the spiral, respectively. A detection device comprising a plurality of the detection devices according to claim 1 arranged in parallel in the width direction, wherein one detection device and a detection device adjacent to the detection device share one wire. The detection device according to claim 1, further comprising a wire different from the two wires, wherein the another wire intersects one of the pair of wires at a plurality of locations, and is outside the one wire. A detection device characterized by overhanging. 4. The detection device according to claim 1, wherein the detection circuit is connected to a pair of conductive members of the tubular switch and detects conduction in the tubular switch; and A detection device comprising an alarm circuit that issues an alarm according to an output.

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