JP2002329271A - Sediment collapse detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of more surely detecting a landslide, particularly a filling collapse among collapse with a simple device. SOLUTION: This device is provided with sensor cables 13 constituting a closed circuit by extending at least two first line 13a and second line 13b to a collapse monitoring position, a collapse detection case 14 provided halfway on the sensor cables 13, a means for connecting the first and second lines 13a and 13b in a freely attachable and detachable way in the collapse detection case 14, an inclination switch 24 inserted into the first or second line 13a or 13b in the case 14 and to be released when an inclination is equal to or greater than a prescribed angle, and a control circuit 30 for outputting an alarm signal while the sensor cables 13 are disconnected, and can detect a collapse both while the sensor cables 13 are disconnected and during disconnection due to an inclination of the inclination switch 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landslide detection device capable of reliably detecting landslides, particularly landslides forming a subgrade of railways and roads, with a simple device.

[0002]

2. Description of the Related Art Conventionally, to detect a landslide, as described in Japanese Patent Publication No. 3-9247, a plurality of piles are driven into a hazardous area, optical fibers are stretched around the piles, and the piles are washed away by a landslide. Then, a method is known in which a landslide is detected by cutting with a separately provided cutter or generating a local bend by a cam and detecting a sudden decrease in backscattered light.

In addition, a coaxial cable is stretched in place of an optical fiber, and a capacitance change occurs between a core wire of the cable and an outer peripheral insulator due to a vibration caused by a landslide, and a voltage change accompanying the capacitance change exceeds a threshold value. There is also a method to detect landslides based on whether or not.

[0004]

In the above-mentioned conventional methods, the apparatus is large and expensive, and installation and adjustment in a landslide danger zone are troublesome.
There was a problem.

[0005] In general, the cut soil 10 is liable to collapse on the surface layer because the earth and sand are stable, but the embankment 11
As shown in FIG. 2, the soil is collapsed so that the bottom is pulled out by heavy rain or an earthquake because it is not adapted to the boundary surface with the cut 10 only by being raised on the cut 10. For this reason, there has been a problem that the optical fiber or the coaxial cable stretched as a sensor is suspended in a state of being suspended without being directly impacted, and the landslide cannot be reliably detected.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device which can more reliably detect a so-called embankment collapse in which the deep soil collapses so that the bottom of the earth collapses due to heavy rain or an earthquake. It is.

[0007]

SUMMARY OF THE INVENTION The present invention provides a sensor cable 1 having at least two first and second lines 13a and 13b extended at a sediment collapse monitoring position to form a closed circuit.
3, a collapse detection case 14 provided at a predetermined interval in the middle of the sensor cable 13, and a collapse detection case 1
A means for removably connecting the first line 13a and the second line 13b in the first case 4 and a predetermined angle inserted into at least one of the first line 13a and the second line 13b in the collapse detection case 14; An earth and sand collapse detection device comprising: a tilt switch 24 that opens when the above-described tilt occurs; and a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected.

[0008] When the embankment 11 collapses, the sensor cable 13 and the collapse detection case 14 flow together with the earth and sand. Inside the collapse detection case 14, the first line 13a, the second line
Since the line 13b is detachably connected, the line 13b is securely disconnected and becomes disconnected. Then, a warning of disconnection is output from the control circuit 30 to the base station. The first line 13a and the second line 13b do not become disconnected, and the sensor cable 1
In case of suspension due to 3, collapse detection case 1
When the tilt switch 24 inside 4 is tilted by 30 degrees or more, the internal contacts are opened and the wire breaks. Therefore, an alarm signal is output from the alarm output terminal 31 of the control circuit 30 when at least one of the disconnection of the sensor cable 13 and the disconnection of the tilt switch 24 is disconnected, thereby making the monitoring function more reliable.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 10 denotes a stable cut 10 formed by cutting the ground itself or a part of the ground. An embankment 11 is raised at the bottom of the cut 10 to form a railway floor or the like, and a rail 12 is laid thereon. A landslide detection device according to the present invention is provided at the landslide detection location on the slope of the embankment 11.

In the earth and sand collapse detecting device according to the present invention, for example, a collapse detecting case 14 is provided at a distance of about 20 m on a sensor cable 13 having a length of 200 m, a control circuit 30 is connected to a base end, and a distal end is connected. Is connected to a check circuit 47.

As shown in FIGS. 4 and 5, the sensor cable 13 has a first line 13a and a second line 13a.
b, three lines of the third line 13c, one end of each of which is introduced into the collapse detection case 14, and the other end thereof is respectively introduced into the adjacent collapse detection case 14, and is like a chain. Are sequentially connected. Further, the sensor cable 13 is protected by being inserted into a protective tube 19 made of aluminum or the like between the two collapse detection cases 14.

The left and right cable insertion seats 20 are loosely fitted in the collapse detection case 14 so that the sensor cable 13 can be easily pulled out, and are introduced with a margin of about 10 cm inside. . A wiring board 21 is provided at the center of the collapse detection case 14.
The connection terminals 22a, 22b, 22c and the connection terminals 23a, 23, which are respectively composed of faston terminals and the like,
b and 23c are provided in two pairs. These connection terminals 2
2a, 22b, 22c and connection terminals 23a, 23b, 23
c, the socket portion is fixed to the wiring board 21, the plug portion is connected to the ends of the first line 13a, the second line 13b, and the third line 13c, and the socket portion and the plug portion are detachably inserted into each other. Have been.

The wiring board 21 has a tilt switch 24.
Is attached, the connection terminal 22a and the connection terminal 23a are connected via the tilt switch 24, and a wiring board 21 is provided between the connection terminal 22b and the connection terminal 23b and between the connection terminal 22c and the connection terminal 23c. And the connection terminal 23a and the connection terminal 22b (or the connection terminal 2
3b), an indicator light 26 with a switch 27 is inserted, and furthermore, a connection terminal 22a (or a connection terminal 23).
A capacitor 25 is inserted between a) and the connection terminal 22b (or the connection terminal 23b).

The tilt switch 24 contains a conductive ball therein and has a constant angle θ (for example, 30 degrees).
When tilted, the contacts open. The capacitor 25
Consists of a time constant circuit with the line resistance and the resistance value of the terminal 39 described later, such as a kick by humans or animals, an earthquake without sediment collapse, a train passing by, etc. This is for giving a time constant (for example, 3 seconds) so that a malfunction does not occur even if a vibration is generated. The indicator light 26 is composed of an LED or the like, and is used for checking the line being monitored by turning on the switch 27 only while the indicator light 26 is being pressed.

All the electric components housed in the collapse detection case 14 are covered with a lid 29 after being filled with an electrically insulating soft filler 28. This prevents rainwater from entering the collapse detection case 14 and causing a short circuit accident. However, even if the soft filler 28 is filled, the connection terminals 22 and 23 can be securely attached and detached.

As shown in FIG. 1, the check circuit 47
A series circuit of a first relay contact 36 and a resistor 39 and a second relay contact 38 are connected in parallel to the tip of the first line 13a and the second line 13b. A series circuit of a first relay coil 35 and a backflow prevention diode 41, a second relay coil 37 and a backflow prevention diode 43 are provided at the end of the third line 13c.
Are connected in parallel. Further, a discharging diode 40 is connected to the first relay coil 35 in a direction opposite to the diode 41, and a discharging diode 42 is connected to the second relay coil 37 in a direction opposite to the diode 43. I have.

The control circuit 30 includes an alarm output terminal 31 for outputting an alarm signal such as a disconnection or a fall, an error output terminal 32 for outputting an error signal such as a short circuit of the sensor cable 13, and a power supply for checking a disconnection or a fall. 24V), and a power supply (5 for checking short-circuits, etc.)
V) is provided. The control circuit 30 is connected to a base station by wire, wirelessly, or the like.

The on-site installation of the sensor cable 13 and the collapse detection case 14 configured as described above will be described with reference to FIGS. 2 and 3 (a) and 3 (b). The case supporting piles 15 are driven at predetermined intervals so as to be a site where earth and sand collapse is detected, such as a slope portion of the embankment 11, and are substantially orthogonal to the landslide direction. The collapse detection case 14 is attached to the upper end of each of the case support piles 15 with an attachment frame 18 and a support plate 17. At this time, the height of the sensor cable 13 from the ground is h (for example, 10 to 20 cm).
Degree) is floated. When mounting the collapse detection case 14, as shown in FIG.
4 is attached so as to substantially coincide with the horizontal line A. However, when the collapse detection case 14 is attached, the angle α between the case support pile 15 and a line C parallel to the insertion line D is set to be equal to or smaller than a predetermined angle. For more information,
As shown in FIG. 7, when the angle between the center line D and the vertical line B of the case support pile 15 when suspended in the air with the sensor cable 13 as a fulcrum is β, the horizontal line H and the bottom of the tilt switch 24 are formed. Angle θ from line A is tilt switch 2
For example, if β = 10 degrees so as to be equal to or greater than the operation angle of 4, α <90 degrees−θ (= 30 degrees) −β (= 10 degrees) = 50 degrees, and α is set to 50 degrees or less. .

The collapse detection case 1 attached in sequence
4, a sensor cable 13 is stretched. Both ends of the sensor cable 13 are placed on pedestals 44 on both sides of the support plate 17, and are held by U-shaped brackets 45 and nuts 46. Sensor cable 13 is collapse detection case 1
4 are connected as described above. A helical cable support pile 16 is screwed into one or several places as needed between the two collapse detection cases 14, and the sensor cable 13 is set up at the upper end thereof by floating the height h as described above. Is done. The reason why the sensor cable 13 is floated from the ground is to prevent the sensor cable 13 from being cut or an unnecessary impact from being applied when cutting the weeds growing on the embankment 11. The number of the sensor cables 13 to be stretched may be one, or a plurality of the sensor cables 13 may be stretched at predetermined intervals.

Next, the operation of the earth and sand collapse detection device according to the present invention will be described. (1) Confirmation of normal state of line The first line 13a and the second line 13b from the control circuit 30
And a predetermined voltage is applied between them. In a normal state where all the tilt switches 24 are turned on and all the connection terminals 22 and 23 are connected, the first relay contact 36 of the check circuit 47 is turned on, so that the first series connected
The line 13a and the second line 13b conduct, and the resistance 39
And a signal indicating a normal state is output to the control circuit 30. If a signal indicating a normal state is not being output, the control circuit 30 may be used to check which collapse detection case 14 has an abnormal state.
The switch 27 is closed by pressing the indicator light 26 in the collapse detection case 14 on the side closer to. If the indicator light 26 lights up,
It is confirmed that at least the line from the control circuit 30 to the collapse detection case 14 having the lit indicator light 26 is normal. Similarly, it is confirmed whether or not the indicator lamps 26 are turned on sequentially from the side closer to the control circuit 30. If it is not lit, it is confirmed that an abnormality has occurred in the collapse detection case 14.

(2) Confirmation of normal operation by disconnection of the sensor cable 13 Forcibly generate a disconnection condition periodically, such as once a day.
It is checked whether the earth and sand collapse detection device according to the present invention operates normally. To this end, +24 V is applied from the power supply terminal 33 to the third line 13c in the control circuit 30 according to a command signal from the base station, and the second line 13b is connected to ground. Then, the first relay coil 35 is excited via the diode 41, and the first relay contact 36 is opened. When the first relay contact 36 is opened, the first line 1
A disconnection condition occurs during the closed circuit of the line 3a and the second line 13b. The alarm output terminal 3 of the control circuit 30 is
An alarm output signal indicating that a disconnection has occurred from 1 is sent to the base station. When the application to the third line 13c is stopped after the check, the first relay contact 36 automatically returns to the normal state (monitoring state).

(3) First line 13a and second line 13
Confirmation of normal operation due to an error due to short circuit of b. A short circuit state is forcibly generated periodically between the first line 13a and the second line 13b, and the earth and sand collapse detection device according to the present invention operates normally. Check whether or not. To this end, +5 V is applied from the power supply terminal 34 to the second line 13b in the control circuit 30 according to a command signal from the base station, and the third line 13c is connected to ground. Then, the first relay coil 35 is excited via the diode 43, and the second relay contact 38 is closed. Second relay contact 3
8 is closed, the first line 13a and the second line 13b
, A short circuit state that does not pass through the resistor 39 occurs.
An error output signal indicating that an error has occurred is sent from the error output terminal 32 of the control circuit 30 to the base station due to this short circuit. When the application to the second line 13b is stopped after the check, the second relay contact 38 automatically returns to the normal state (monitoring state).

(4) Operation at Collapse of Earth and Sand Assume that the embankment 11 has collapsed as shown in FIG. Since the collapse of the embankment 11 causes the case supporting pile 15 and the cable supporting pile 16 to flow, the sensor cables 13 supported by the case supporting pile 15 and the cable supporting pile 16 also flow along with the earth and sand. Inside the collapse detection case 14, the first line 13 a and the second line 13 b are connected to the connection terminal 2.
2. Since the sensor cable 13 is detachably connected to the connection terminal 23 and is easily attached to the collapse detection case 14 by the cable insertion seat 20, the sensor cable 13 is securely disconnected at the connection terminal 22 and the connection terminal 23 and is disconnected. State. Then, as described above, a disconnection alarm is output from the alarm output terminal 31 of the control circuit 30 to the base station. Embankment 11
Is different from the cut 10 in that the deep portion is flown and the surface portion is not subjected to much impact. As shown in FIGS. 6 and 7, the first line 13a and the second line
The line 13b may not be disconnected, and may be suspended in the air by the sensor cable 13. In such a case, since the case support pile 15 functions as a weight, the collapse detection case 14
The tilt switch 24 inside is surely tilted 30 degrees or more,
The internal contacts are opened and the wire breaks. Therefore, an alarm signal is output from the alarm output terminal 31 of the control circuit 30 in at least one of the disconnection state of the connection terminal 22 and the connection terminal 23 and the disconnection state of the tilt switch 24, and the monitoring function is further improved. I'm sure.

In the above-described embodiment, the case is mounted on the upper end of the case support pile 15, but the present invention is not limited to this, and may be mounted on a pedestal such as concrete formed on the embankment 11. In the above-described embodiment, the sensor cable 13 is mounted slightly above the ground, but the present invention is not limited to this, and the sensor cable 13 may be embedded in the ground. In this case, the indicator light 26 and the switch 2
Put only 7 on the ground so that you can check it visually.

In the above embodiment, the tilt switch 24 and the like
A collapse detection case 14 in the shape of a rectangular parallelepiped was provided, housed therein, and filled with a soft filler 28 after storage for waterproofing. However, in order to simplify the configuration and make the shape compact, instead of the new collapse detection case 14 made for the device of the present invention as described above, as shown in FIGS. The connector 48 having such a configuration can be used as the collapse detection case 14, and the inclination switch 24 and the like can be housed therein. That is, FIGS. 8 and 9
Since the connector 48 comprises a cylindrical socket body 49 and a plug body 50, the socket body 4
The tilt switch 24 and the like are housed in the hollow portion 51 inside the plug 9 or the plug body 50. 8 and 9 show an example in which the tilt switch 24 and the like are housed in the hollow portion 51 of the socket body 49, and a detailed configuration thereof will be described below.

The socket body 49 has a cavity 51
The press-contact tube 57 and the tightening cap 5
8 is provided, and on the other end side, an insulator 54 having a connection terminal 52 attached at the center is covered with a fitting cylinder 55,
The fitting cylinder 55 is detachably attached to the socket body 49. In such a socket body 49, first, the tightening cap 58 on one end side of the socket body 49 is used.
And the pressure contact cylinder 57 are loosened, and the sensor cable 13 is passed through.
The sensor cable 13 and the connection terminal 52 are connected to the printed wiring terminal of the wiring board 21 on which the tilt switch 24 and the like are mounted with the fitting cylinder 55 on the other end of the socket body 49 removed.
And connect. In this state, the wiring board 21 is housed in the hollow portion 51 of the socket body 49, and the fitting tube 55 is fixed to the socket body 49. At this time, the tilt switch 24 is aligned with the mark on the outside of the socket body 49 so that the tilt switch 24 is closed upward. When the fastening cap 58 at one end is fastened to the socket body 49, the press-fitting cylinder 57
And the socket main body 49 are pressed against each other on the tapered surfaces, and the sensor cable 13 is brought into close contact with the socket body 49, and a waterproof effect is obtained.

The plug main body 50 is different from the socket main body 49 in that the plug main body 50 has a connection pin 53 and a connection ring 56, but the other configuration is almost the same as the socket main body 49. The cable 13 and the connection pin 53 are connected. When the plug body 50 is inserted into the socket body 49 thus configured, the connection terminals 52 of the socket body 49 and the connection pins 53 of the plug body 50 are connected.
Are connected, and the connecting ring 56 of the plug body 50 is further connected.
Is screwed into the fitting cylinder 55 of the socket body 49 and fixed. The connector 48 connected in this manner is wrapped in a waterproof tube 59 and adhered by heat shrinkage to provide a more waterproof effect, and then the tilt switch 24 is turned upward to support the weight 61. Placed on the plate 17, the socket body 49 side and the plug body 50 side
The location is fixed with a downward U-shaped fixture 60.

The connector 48 attached to the support plate 17
Is used as an earth and sand collapse detection device in the same manner as shown in FIGS. However, when installed in the monitoring area, unlike the above embodiment, the case support pile 15
The support plate 17 to which the connector 48 is attached is directly installed on the ground or in the ground horizontally without using. Then, the support plate 1
Since a weight 61 for biasing the weight is provided at one end of the connector 7, when the connector 48 is suspended in a state of being connected to the sensor cable 13 due to collapse of earth and sand, the inside of the connector 48 is suspended. The tilt switch 24 is forcibly rotated by 90 degrees, so that the ball inside moves and the tilt switch 24 is turned off.

The support plate 17 to which the connector 48 is attached is
It is not limited to the case where it is installed directly on the ground or horizontally in the ground, but it is not limited to the fences and supports installed between the cut 10 and the embankment 11 as shown in FIG. Civil structures 6 such as walls, protective roofs, guardrails, etc.
2 can also be installed at the top. As described above, the connector 48 fixed to the support plate 17 is attached to the civil structure 62 at the earth / sand collapse monitoring position, so that the tilt switch 24 is closed at the time of monitoring, but the civil structure 62 collapses when the earth / sand collapses. When the connector 48 and the support plate 17 are separated from the civil engineering structure 62, the sensor 48 is suspended by the sensor cable 13 and tilted by the weight 61, and
When the civil structure 62 is inclined with the connector 48 and the support plate 17 attached, the inclination switch 24 is opened by inclining together with the civil structure 62 by a predetermined angle or more. Therefore,
Not only landslides, but also fences, retaining walls,
The inclination of the civil engineering structure 62 such as a protective roof can be detected.

In FIG. 8, the tilt switch 24 and the like are housed in the cavity 51 inside the socket body 49, but the present invention is not limited to this.
The tilt switch 24
The other necessary parts are divided into two parts and
It may be stored in.

The sensor cable 13 at the time of earth and sand collapse
Can be detected by disconnection of the sensor cable 13 and the wiring board 21 or disconnection of the sensor cable 13 and the connection pin 53, but the connection ring 56 of the plug body 50 is fitted to the socket body 49. 55, the connection terminals 5 of the socket body 49 are not connected.
The connection may be detected by disconnection between the connection pin 2 and the connection pin 53 of the plug body 50. Although the indicator lamp 26 is attached in FIGS. 4 and 5, it may be omitted in the examples of FIGS. 8 and 9 due to the attachment position.

[0032]

According to the first aspect of the present invention, at least two first and second lines 13a and 13b are provided at a monitoring position of a landslide to form a closed circuit, and the sensor cable 13 has a closed circuit. A collapse detection case 14 provided at a predetermined interval in the middle of the cable 13, means for detachably connecting the first line 13 a and the second line 13 b within the collapse detection case 14,
A tilt switch 24 that is inserted into at least one of the first line 13a and the second line 13b and that opens when tilted by a predetermined angle or more;
And a control circuit 30 that outputs an alarm signal in the event of a disconnection state, not only the disconnection state of the sensor cable 13 but also the deep portion of the embankment 11 without disconnection of the sensor cable 13 and the inclination switch 24 Even if it is tilted more than an angle, the landslide can be reliably detected.

According to the second aspect of the present invention, the connection terminals 22a, 2a
2b and two pairs of connection terminals 23a, 23b are provided, an inclination switch 24 is inserted between the connection terminals 22a, 23a, and the connection terminals 22b, 23b are short-circuited, and the collapse detection case 14 Of the sensor cables 13 cut inside, the first line 13a of one sensor cable 13 is detachably connected to the connection terminal 22a, and the second line 13b is detachably connected to the connection terminal 22b. Connect one line 13a to connection terminal 23a
In addition, since the second line 13b is detachably connected to the connection terminal 23b, the first line 13a of the sensor cable 13 can be connected without disconnecting the sensor cable 13.
Alternatively, the second line 13b is connected to the connection terminal 22 or the connection terminal 23.
If it comes out, the wire will be in a disconnected state, so that the detection of the landslide will be more reliable and the sensor cable 1
3. Installation work of the collapse detection case 14 and the like becomes easy.

According to the third aspect of the present invention, the connection terminal 2
Since the indicator lamp 26 with the switch 27 is inserted between the terminal 3a and the connection terminal 23b, when a failure occurs inside the collapse detection case 14, a plurality of collapse detection cases 1 are provided.
4, it is possible to easily check at which point a failure has occurred.

According to the fourth aspect of the present invention, the collapse detecting case is filled with the soft filler 28 having an insulating property, so that even if the collapse detecting case is exposed to rainwater for a long time, the collapse detecting case may be short-circuited. Unnecessary disconnection or malfunction due to temporary vibration can be prevented, and the collapse of earth and sand can be reliably detected.

According to the fifth aspect of the present invention, the collapse detection case 14 is the upper end of the case support pile 15 inserted into the sediment collapse monitoring position, and the collapse detection case 14 and the case support pile 15 are connected to the sensor cable 13. In the suspended state, the case support pile 15 becomes a weight and is inclined at a predetermined angle or more, so that the tilt switch 24 is opened. Even if no landslides occur, the landslide can be reliably detected.

According to the sixth aspect of the present invention, the protective tube 1 is connected to the sensor cable 13 between the adjacent collapse detection cases 14.
9 so that the sensor cable 13
Can be prevented from being accidentally cut or damaged, and long-term stable monitoring can be performed.

According to the seventh aspect of the present invention, the protective tube 1 is connected to the sensor cable 13 between the adjacent collapse detection cases 14.
9 and the intermediate position between the adjacent collapse detection cases 14 in the protective tube 19 is held by one or a plurality of cable support piles 16, so that the sensor cable 13 can be installed under the same conditions in all sections.

According to the eighth aspect of the present invention, three first lines 13a, second lines 13b,
A third line 13c is stretched, and two of the first line 13a and the second line 13b are inserted with the resistor 39 of the terminal to form a closed circuit, and the sensor cable 13 is provided in the middle of the sensor cable 13. A collapse detection case 14 provided at a predetermined interval, and the first
A means for removably connecting the line 13a and the second line 13b, and a means inserted into at least one of the first line 13a and the second line 13b in the collapse detection case 14 and opened when inclined at a predetermined angle or more; A tilt switch 24, a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected, and a third line 13c and a second line 13b in the terminal, which are inserted in series with the resistor 39 by excitation. And the first relay coil 35 that opens the normally closed first relay contact 36, so that the disconnection state is forcibly generated periodically, such as once a day, and the earth and sand collapse detection device according to the present invention. Can be checked to see if it works properly.

According to the ninth aspect of the present invention, three first lines 13a, second lines 13b,
A third line 13c is stretched, and two of the first line 13a and the second line 13b are inserted with the resistor 39 of the terminal to form a closed circuit, and the sensor cable 13 is provided in the middle of the sensor cable 13. A collapse detection case 14 provided at a predetermined interval, and the first
A means for removably connecting the line 13a and the second line 13b, and a means inserted into at least one of the first line 13a and the second line 13b in the collapse detection case 14 and opened when inclined at a predetermined angle or more; A tilt switch 24, a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected, and a second line 13b and a third line 13c in the terminal, which are inserted in parallel with the resistor 39 by excitation. And the second relay coil 37 that closes the normally opened second relay contact 38, so that the first line 13a and the second line 13
A short circuit condition is forcibly generated during the period b, and it can be checked whether or not the earth and sand collapse detection device according to the present invention operates normally.

According to the tenth aspect of the present invention, the three first lines 13a and the second lines 13
b, the third line 13c is extended, and two of the first lines 13c are provided.
A sensor cable 13 that constitutes a closed circuit by inserting a terminal resistor 39 into the line 13a and the second line 13b, a collapse detection case 14 provided at a predetermined interval in the middle of the sensor cable 13, and an inside of the collapse detection case 14 Means for detachably connecting the first line 13a and the second line 13b with the first line 13a and the first line 13a in the collapse detection case 14.
A tilt switch 24 that is inserted into at least one of the line 13a and the second line 13b and that opens when the sensor cable 13 is tilted at a predetermined angle or more; a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected;
A diode 4 is provided between the line 13c and the second line 13b.
1, a first relay coil 35 for opening a normally closed first relay contact 36 inserted in series with the resistor 39 by excitation thereof, and a second line 13b at the terminal.
And a third line 13c via a diode 43, and is inserted in parallel with the series circuit of the first relay coil 35 and the diode 41, and the first relay contact 36 and the resistor 39 are connected in series by excitation. The present invention includes the second relay coil 37 that closes the normally open second relay contact 38 inserted in parallel with the circuit, so that the disconnection state is forcibly generated periodically, such as once a day. It is possible to check whether the landslide detection device according to the present invention operates normally, and to forcibly generate a short circuit between the first line 13a and the second line 13b. You can check if it works.

According to the eleventh aspect of the present invention, the collapse detection case 14 comprises the connector 48 for detachably connecting the connection terminal 52 of the socket main body 49 and the connection pin 53 of the plug main body 50. And / or because the tilt switch 24 is housed in the cavity 51 inside the plug body 50, it can be configured simply and compactly.
Moreover, the handling is extremely convenient.

According to the twelfth aspect of the present invention, the connector 48 is fixed to the support plate 17 to which the weight 61 for biasing the weight at one end is attached. The tilt switch 24 is forcibly rotated, and the tilt can be detected reliably.

According to the thirteenth aspect, the support plate 1
7 is attached to the civil engineering structure 62 at the sediment collapse monitoring position, the tilt switch 24 is closed during monitoring, but the connector 48 and the support plate 17 are suspended by the sensor cable 13 when the sediment collapses. The tilt switch 24 is opened by tilting the weight 61 with the weight 61 when it becomes the above, and by tilting the civil structure 62 by a predetermined angle or more together with the civil structure 62 when tilted. Therefore, not only the collapse of the earth and sand but also the inclination of the civil engineering structure 62 such as the fence, the retaining wall, and the protective roof due to the collapse of the earth and sand can be detected.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of an earth and sand collapse detection device according to the present invention.

FIG. 2 is a perspective view showing a state in which the earth and sand collapse detection device according to the present invention is installed on an embankment 11;

3A is an explanatory view showing a state in which a case support pile 15 is driven into the embankment 11 and a collapse detection case 14 is attached, and FIG. 3B is a diagram illustrating a state in which a cable support pile 16 is inserted into the embankment 11 and a sensor cable 13 is inserted. FIG. 6 is an explanatory diagram showing a state in which the state is held.

FIG. 4 is a plan view showing an internal state when the lid 29 is removed from the collapse detection case 14 in the earth and sand collapse detection device according to the present invention.

FIG. 5 is a longitudinal sectional view in FIG.

FIG. 6 shows an embankment 11 provided with the earth and sand collapse detection device of the present invention
It is explanatory drawing of the collapse state of.

FIG. 7 is a front view when the collapse detection case 14 is suspended from the sensor cable 13 while being attached to the case support pile 15;

FIG. 8 is a cross-sectional view showing a socket body 49 and a plug body 50 in another embodiment using a connector 48 as the collapse detection case 14 used in the earth and sand collapse detection device according to the present invention.

9 is a front view showing a state where the socket main body 49 and the plug main body 50 are connected and attached to the support plate 17 in FIG.

[Explanation of symbols]

Reference Signs List 10 cut, 11 embankment, 12 rail, 13 sensor cable, 14 collapse detection case, 15 case support pile, 16 cable support pile, 17 support plate, 18 mounting frame, 19 protection tube , 20 ... cable insertion seat, 21 ... wiring board, 22, 22a, 22b, 22c ... connection terminal, 2
3, 23a, 23b, 23c: connection terminal, 24: tilt switch, 25: capacitor, 26: indicator light, 27: switch, 28: soft filler, 29: lid, 30: control circuit,
31 ... alarm output terminal, 32 ... error output terminal, 33 ... power supply terminal, 34 ... power supply terminal, 35 ... first relay coil, 3
6 first relay contact, 37 second relay coil, 38
2nd relay contact, 39 ... resistance, 40 ... diode, 41
... Diode, 42 ... Diode, 43 ... Diode,
44 pedestal, 45 U-shaped bracket, 46 nut, 47 check circuit, 48 connector, 49 socket body,
50: plug body, 51: hollow part, 52: connection terminal, 5
3 Connection pin, 54 Insulator, 55 Fitting cylinder, 56 Connection ring, 57 Pressure contact cylinder, 58 Cap, 5
9 ... waterproof tube, 60 ... fixture, 61 ... weight, 62
... civil engineering structures.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Murakami 2940 Shinyoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Nippon Koei Co., Ltd. Yokohama Office F-term (reference) 2D044 EA07 2F076 BB09 BD18 BE03 BE05 BE12 BE17 5C086 AA14 AA48 BA30 CA01 CA22 CA26 CB21 DA07 DA08

Claims (13)

[Claims] 1. A sensor cable 13 that forms a closed circuit by extending at least two first lines 13a and second lines 13b at a sediment collapse monitoring position, and is provided at predetermined intervals along the sensor cable 13. Collapse detection case 1
4 and the first line 13 in the collapse detection case 14.
means for detachably connecting a to the second line 13b;
An inclination switch 24 inserted into at least one of the first line 13a and the second line 13b in the collapse detection case 14 and opened when the inclination is equal to or more than a predetermined angle.
And a control circuit 30 for outputting an alarm signal when the sensor cable 13 is disconnected. 2. A wiring board 2 provided in a collapse detection case 14.
1, connection terminals 22a and 22b, connection terminals 23a and 2
3b are provided, and connection terminals 22a and 2
3a, the tilt switch 24 is inserted into the connection terminal 22.
b and 23b are short-circuited, and among the sensor cables 13 cut in the collapse detection case 14, the first line 13a of one sensor cable 13 is connected to the connection terminal 22a.
The second line 13b is detachably connected to the connection terminal 22b, and the first line 1 of the other sensor cable 13 is connected.
The earth and sand collapse detection device according to claim 1, wherein 3a is connected to the connection terminal 23a and the second line 13b is connected to the connection terminal 23b in a detachable manner. 3. The earth and sand collapse detection device according to claim 2, wherein an indicator light 26 with a switch 27 is inserted between the connection terminals 23a and 23b. 4. The landslide detection device according to claim 1, wherein the landslide detection case is filled with a soft filler having an insulating property. 5. The collapse detection case 14 is an upper end portion of the case support pile 15 inserted into the sediment collapse monitoring position. When monitoring, the tilt switch 24 is closed.
The earth and sand collapse detection device according to claim 1, wherein the collapse detection case (14) and the case support pile (15) are mounted so that the inclination switch (24) is opened by inclining at a predetermined angle or more when suspended by the sensor cable (13). 6. The earth and sand collapse detection device according to claim 1, wherein a protective tube 19 is placed over the sensor cable 13 between the adjacent collapse detection cases 14. 7. A protection tube 19 is put on the sensor cable 13 between the adjacent collapse detection cases 14, and one or a plurality of cable support piles 16 are positioned at an intermediate position between the adjacent collapse detection cases 14 in the protection tube 19. The earth and sand collapse detection device according to claim 1, wherein the device is held. 8. The three first lines 1 are located at the sediment collapse monitoring position.
3a, a second line 13b, and a third line 13c,
Two of the first line 13a and the second line 13b
A sensor cable 13 that forms a closed circuit by inserting a resistor 39 of a terminal into the sensor cable 13, a collapse detection case 14 provided at predetermined intervals in the sensor cable 13, and the first line 13a in the collapse detection case 14. 2nd line 1
Means for detachably connecting the first line 13a and the second line 13b in the collapse detection case 14.
A tilt switch 24 that is inserted into at least one of the above and is opened when the tilt is greater than a predetermined angle, and a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected.
And the third line 13c and the second line 13b at the terminal
The first relay contact 36, which is inserted between the resistor 39 and the normally closed first relay contact 36 inserted in series with the resistor 39,
An earth and sand collapse detection device comprising a relay coil 35. 9. The three first lines 1 are located at the sediment collapse monitoring position.
3a, a second line 13b, and a third line 13c,
Two of the first line 13a and the second line 13b
A sensor cable 13 that forms a closed circuit by inserting a resistor 39 of a terminal into the sensor cable 13, a collapse detection case 14 provided at predetermined intervals in the sensor cable 13, and the first line 13a in the collapse detection case 14. 2nd line 1
Means for detachably connecting the first line 13a and the second line 13b in the collapse detection case 14.
A tilt switch 24 that is inserted into at least one of the above and is opened when the tilt is greater than a predetermined angle, and a control circuit 30 that outputs an alarm signal when the sensor cable 13 is disconnected.
And a second line 13b and a third line 13c at the terminal
A second relay contact 38 which is inserted in parallel with the resistor 39 and closes the normally open second relay contact 38 which is inserted in parallel with the resistor 39.
An earth and sand collapse detection device comprising a relay coil 37. 10. A first line 13a, a second line 13b, and a third line 13c are provided at the monitoring position of the landslide, and two of the first line 13a and the second line 1 are provided.
3b, a sensor cable 13 forming a closed circuit by inserting a resistor 39 of a terminal, a collapse detection case 14 provided at predetermined intervals in the sensor cable 13, and the first line 13a in the collapse detection case 14. Means for detachably connecting the second line 13b to the first line 13a and the second line 1 in the collapse detection case 14.
3b, which is inserted into at least one of them and is opened when the inclination is equal to or more than a predetermined angle, a control circuit 30 which outputs an alarm signal when the sensor cable 13 is disconnected, a third line 13c and a second line in the terminal. 1
3b, a first relay coil 35 that opens through a diode 41 and opens a normally closed first relay contact 36 that is inserted in series with the resistor 39, and a second line 13b at the terminal. It is inserted in parallel with the series circuit of the first relay coil 35 and the diode 41 via the diode 43 between the third line 13c and the series circuit of the first relay contact 36 and the resistor 39 by excitation. And a second relay coil 37 that closes the normally open second relay contact 38 inserted in parallel. 11. The collapse detection case 14 comprises a connector 48 for removably connecting a connection terminal 52 of a socket body 49 and a connection pin 53 of a plug body 50, and the inside of the socket body 49 and / or the plug body 50. The earth and sand collapse detection device according to claim 1, wherein the inclination switch (24) is housed in the hollow portion (51). 12. The apparatus according to claim 11, wherein the connector is fixed to a support plate to which a weight for biasing the weight at one end is attached. 13. The collapse detection case 14 comprises a connector 48 for removably connecting a connection terminal 52 of a socket body 49 and a connection pin 53 of a plug body 50, and the inside of the socket body 49 and / or the plug body 50. The tilt switch 24 is housed in the hollow portion 51 of the
Is fixed to a support plate 17 to which a weight 61 for biasing the weight at one end is attached, and a connector 48 fixed to the support plate 17 is a civil structure 62 at a sediment collapse monitoring position. 2. The landslide detection device according to claim 1, wherein the inclination switch 24 is closed and the connector 48 and the support plate 17 are inclined at a predetermined angle or more and the inclination switch 24 is opened when landslide occurs.