JP2798205B2 - Water leak monitoring device at waste disposal site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage monitoring device for a waste disposal site, and more particularly to a water leakage monitoring device for a waste disposal site which has a simple structure and can quickly detect a water leakage portion.

[0002]

2. Description of the Related Art In order to protect the environment, a water disposal sheet is provided at the bottom of a waste disposal site to prevent water leakage from the waste to the underground. It is necessary to monitor the presence or absence of water leakage in order to demonstrate the effect of preventing water leakage. FIG. 3 shows an example of the monitoring device. A current is injected from the current source 11 through an external current electrode 12 provided on the ground around the waste disposal site D and an internal current electrode 13 in the waste disposal site D as shown by an arrow I. When there is no water leakage in the impermeable sheet 18 provided at the bottom of the waste disposal site D, substantially no current flows from the waste disposal site D to the ground G, and no potential difference is caused by the current. When a water leaking portion F occurs due to breakage of the water impermeable sheet 18, a water leak as shown by an arrow L occurs, and if the current source 11 is connected as described above, a current flowing to the ground G via the water leaking portion F is generated. Flows. This current causes a potential difference corresponding to the electrical characteristics of the waste to be generated in the waste disposal site D as shown by the broken line curve in FIG.
If the voltmeter 14 is connected between the reference electrode 15 and the sheet surface electrode 16 or between the reference electrode 15 and the surface electrode 17, this potential difference can be detected. That is, the occurrence of water leakage can be detected by monitoring the potential difference.

[0003] In the apparatus of FIG.
It is theoretically possible to detect the position of the water leaking part F from the measurement of the potential difference, since it is a function of the current passing through.
However, in reality, the electric characteristics of the waste are not constant, and the potential difference depends on the electric characteristics of various wastes. Therefore, it is not always easy to detect the water leaking portion F and the measurement accuracy is low. Was.

The device shown in FIG. 4 has been proposed to solve this problem. A plurality of internal conductors 20 are provided in parallel inside a water-impervious sheet 18 provided at the bottom of a waste disposal site, and a plurality of parallel external conductors 21 are arranged outside of the water-impervious sheet 18 in a direction crossing the internal conductors 20. By monitoring the current at the intersection of the inner conductor 20 and the outer conductor 21 arranged in a lattice in this manner, the presence or absence of the water leakage and the position of the water leakage are monitored. In the figure, 22 is a selector for the internal conductor 20, 23 and 24 are selectors and amplifiers for the external conductor 21, 25 is a current detector for the internal conductor selected by the selector 22, and a rectifier 26 is connected to this. It is converted to a digital signal by the / D converter. 2 from the two-phase oscillator 27 connected to the amplifier 24
The output is the current detector at the phase detectors 28 and 29, respectively.
Processed with 25 outputs, the outputs of both phase detectors 28 and 29
It is converted to a digital signal by the A / D converter. A / D above
By analyzing the digital signal from the converter, it is possible to constantly monitor water leakage.

[0005]

However, in the conventional water leakage monitoring device shown in FIG. 3, in addition to the low accuracy of detecting the water leakage position, troublesome work outdoors is indispensable for its monitoring. There is also a problem of poor sex. The water leakage monitoring device of FIG. 4 has improved workability, but requires advanced analysis processing technology and thus requires special technicians, and also has a function to keep all the inner conductor 20 and the outer conductor 21 in good conduction. There is a problem that requires maintenance work.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water leakage monitoring device for a waste disposal site that can detect the occurrence and location of water leakage with a simple configuration.

[0007]

FIG. 1 shows the configuration of the present invention.
Referring to FIG. 1, the water leakage monitoring device of the waste disposal site D according to the present invention includes a water-impervious inner membrane 1 and a water-impervious outer membrane 2 provided on a bottom surface of a waste accommodating space formed on the surface of the ground G. A plurality of high resistance elements R distributed between the inner film body 1 and the outer film body 2 facing the entire bottom surface, a resistance connection line T for connecting the high resistance elements R in series, and a total length of the resistance connection line T; A bare conductive wire H arranged between the inner film body 1 and the outer film body 2 side by side with the resistance connection line T, and in the ground G facing the bottom surface of the waste storage space.
Provided ground electrode E, one end of resistance connection line T and bare conductor H
That is selectively connected to one end of the terminal or the ground electrode E
3 and the bare conductor H by one end of the resistance connection line T and water leakage.
And / or high resistance element R substantially short-circuited to ground electrode E
The number of the high-resistance elements R between the two is determined from the measured value of the resistance meter 3 to monitor the presence or absence of water leakage and the position of water leakage.

[0008]

A plurality of resistance connection lines T respectively connected to a plurality of high resistance elements R are arranged in parallel as shown in FIGS. 1A and 1B, and a bare conductor is connected between adjacent resistance connection lines T. The operation of the embodiment will be described with reference to FIGS.
It is not limited to the example of (B). For example, a single resistance connection line T and a bare conductor H parallel to it may be arranged in a spiral. FIG. 1B is a plan view showing the internal film body 1 omitted. When there is no leaking point F, the resistance connection line T and the bare conductor H adjacent thereto are insulated by the material of the film bodies 1 and 2 or air therebetween.
One end of the resistance connection line T, for example, the external connection terminal 10T shown in FIG.
If the ohmmeter 3 is connected between the bare conductor H and one end of the bare conductor H, for example, the external connection terminal 10H in FIG. 1C, a substantially infinite resistance value is measured, and the substantially infinite resistance value is measured. The absence of the leak location F can be confirmed.

At least one of the inner membrane 1 and the outer membrane 2 has a water leakage point F, and the two membranes 1, 2 at the water leakage point F are formed.
When there is water in between, the high resistance element R and the adjacent bare conductor H at that portion are substantially short-circuited by water. Resistance connection line T
The distance d (FIG. 1 (B)) between the wire and the adjacent bare conductor H can be selected to be sufficiently short so that this substantially short circuit can be surely caused by water leakage. In this case, FIG. 1 as shown (C), the external connection terminal 10T of the connected resistor connecting line T _i to the high-resistance element R, wherein the substantially short circuit occurs, adjacent bare conductors H _i-1
If the ohmmeter 3 is inserted between the external connection terminal 10H and the external connection terminal 10H, a finite resistance value is measured, and the leakage point F can be detected by detecting the finite resistance value.

Furthermore, as can be understood from FIG. 1 (C), the between the high-resistance element R substantially short circuit occurs between the external connecting terminals 10T of the resistance connection line T _i that contains the short-circuit high-resistance element R Can be estimated from the finite resistance value measured by the resistance meter 3. For example, Figure 1 resistance connection line in (C) T _i upper external connection terminal 10T is resistance meter 3 in
Is connected, the second high resistance element R is substantially short-circuited from the external connection terminal 10T, so that the finite resistance value is expected to be between R and 3R. That is, from the finite resistance value measured for a specific resistance connection line T _i , it is possible to estimate the position of the substantially short-circuited high resistance element R on the resistance connection line T. Therefore, the position of the leak location F can be estimated from the position of the resistance connection line T connected to the resistance meter 3 and the measured finite resistance value.

Further, a ground electrode E is provided in the ground G outside the waste disposal site D, and a resistance value between the ground electrode E and the resistance connection line T or the bare conductor H is measured. It is theoretically expected that this resistance value will change significantly depending on the presence or absence of water leakage in the outer membrane 2. Therefore, it is possible to detect whether or not the water leak at the water leaking point F penetrates the outer membrane 2.

In this way, the object of the present invention is to provide a "leakage monitoring device for a waste disposal site that can detect the occurrence and location of a leak with a simple configuration".

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The resistance meter 3 of the embodiment shown in FIG. 1C has an ammeter 5, a power supply 6 connected thereto and a protection resistor 7. In this case, the selector comprises a selector 4A for the resistance connection line T and a bare conductor H
And a movable contact 8 connected to the ohmmeter 3 and a fixed contact 9 connected to the corresponding resistance connection line T or the bare conductor H, respectively. On the waste disposal site D side, external connection terminals 10T and 10H are provided at both ends of each resistance connection line T and the bare conductor H for convenience of connection with an external device. In order to increase the accuracy of determining the position of the water leaking point F, for example, the positions estimated by connecting the external connection terminals 10T and 10H at the upper end of FIG. It is also possible to compare and examine the position estimated using 10H.
In the illustrated example, the ground electrode E is connected only to the selector 4B for the bare conductor H. However, this may be provided only for the selector 4A for the resistance connection conductor T, or may be provided in both selectors 4A and 4B. . The inventor of the present invention selects the distance d between the resistance connection line T and the adjacent bare conductor H shown in FIG. And a bare short-circuit with the bare conductor H.

FIGS. 2A and 2B show a waste disposal site D.
A plurality of detection electrodes K are distributed between the inner membrane body 1 and the outer membrane body 2 so as to face the entire bottom surface of the waste storage space,
A multi-core electric wire M is laid between the inner membrane 1 and the outer membrane 2;
A detection electrode K corresponding to each core of the multi-core wire M
Is shown in the embodiment. In this embodiment, the detection electrode K
Are arranged in a lattice pattern composed of parallel rows, and the detection electrodes K in each row are connected to the core wires of the same multi-core electric wire M, but the present invention is not limited to this arrangement and connection. If there is no leakage,
The resistance value between the adjacent detection electrodes K is kept substantially infinite. If water leaks at the leak location F so as to straddle the adjacent detection electrodes K, the adjacent detection electrodes K are substantially short-circuited.
Therefore, by sequentially measuring the resistance value between an arbitrary pair of adjacent detection electrodes K, it becomes possible to monitor the presence or absence of water leakage and to estimate the position of the water leakage point F.

FIG. 2C shows a selector for selectively connecting the pair of detection electrodes K shown in FIGS. 2A and 2B to the resistance meter 3.
4 shows the configurations of 4A and 4B. The configuration and operation of these selectors 4A and 4B can be easily understood from the selectors 4A and 4B of FIG. 1C described above in the case where the high resistance element R is used.

[0016]

As described above in detail, the water leakage monitoring device for a waste disposal site according to the present invention has a water-impervious inner membrane and an outer membrane superposed and stretched on the bottom of the waste disposal site. ,
A high-resistance element or a detection electrode is dispersedly arranged between the two membranes so as to face the entire bottom surface of the waste accommodating space, and water leakage is monitored by a change in resistance value at the water leakage location, so that the following remarkable effects are obtained.

(A) With a monitoring device having a simple structure, it is possible to continuously monitor water leakage at a waste disposal site. (B) The location of the leak location can be quickly estimated. (C) Water leakage can be monitored without the need for advanced technology and without the need for special technicians.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

FIG. 3 is an explanatory view of a conventional water leakage monitoring device using electrodes.

FIG. 4 is an explanatory view of a conventional water leakage monitoring device using grid-arranged electric wires.

[Explanation of symbols]

1 inner membrane 2 outer membrane 3 ohmmeter 4 selector 5 ammeter 6 power supply 7 protection resistor 8 movable contact 9 fixed contact 10 external connection terminal 11 current source 12 external current electrode 13 internal current electrode 14 voltmeter 15 reference electrode 16 Seat electrode 17 Surface electrode 18 Waterproof sheet 20 Internal conductor 21 External conductor 22 Internal conductor selector 23 External conductor selector
24 Amplifier 25 Current detection circuit 26 Rectifier 27 Two-phase oscillator 28 Phase detection circuit 29 Phase detection circuit D Waste disposal site E Ground electrode e Ground wire F Leakage point G Ground H Naked conductor K Detection electrode L Arrow (water leakage) M Multicore Wire R High resistance element T Resistance connection line d Line spacing I Arrow (current).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-136730 (JP, A) JP-A-58-79131 (JP, A) JP-A-63-101842 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) G01M 3/00

Claims (4)

(57) [Claims] 1. A water-impervious inner membrane and a water-impervious outer membrane which are provided on a bottom surface of a waste accommodating space formed on a ground surface, and between the inner membrane and the outer membrane facing the entire bottom surface. A plurality of high-resistance elements distributed in the same manner, a resistance connection line connecting the high-resistance elements in series, and a naked body disposed between the inner film body and the outer film body along with the resistance connection line over the entire length of the resistance connection line. Conductor in the ground facing the bottom of the waste storage space
The ground electrode provided on one end, and one end of the resistance connection line and a bare conductor
Or a resistor selectively connected to one end of the
A bare lead wire is provided with a resistance gauge and one end of the resistance connection wire and water leakage.
And / or the high resistance substantially shorted to the ground electrode
A leakage monitoring device for a waste disposal site, wherein the number of the high resistance elements between the element and the element is determined from the measured value of the resistance meter to monitor the presence or absence of the leakage and the position of the leakage. 2. The water leakage monitoring device according to claim 1, wherein the plurality of high resistance elements are arranged in a plurality of parallel rows, and a plurality of resistance connection lines for connecting each of the plurality of high resistance element rows in series are provided. And one each between adjacent parallel resistance connection lines.
The bare conductors of the place, of a particular of the resistive connection line end and those
One end or the contact of the bare conductors adjacent to the specific resistance connection line
A leakage monitoring device for a waste disposal site, comprising a selector for selectively connecting the resistance meter to a ground electrode . 3. A bottom surface of a waste storage space formed on a ground surface.
A water-impervious inner membrane and a water-impervious outer membrane,
The space between the inner membrane and the outer membrane is opposed to the entire bottom surface.
A plurality of dispersed detection electrodes, each of the detection electrodes
A plurality of connected cores are included and the inner membrane and the outer
Multi-core wires placed between membranes, bottom of the waste storage space
Ground electrode provided in the ground facing the surface, and
The end of the core wire of the multi-core wire corresponding to the detection electrode and the feature
The multi-core corresponding to the adjacent detection electrode adjacent to the fixed detection electrode
Selective connection between the end of the core of the wire or the ground electrode
Equipped with a resistance meter connected to the
The position of the detection electrode which is substantially short-circuited to the ground electrode is determined by the resistance meter.
A leak monitoring device at a waste disposal site that monitors the presence and location of leaks by determining from the measured values of 4. The water leakage monitoring device according to claim 3, wherein
The output electrodes are arranged in a plurality of parallel rows, and each of the plurality of rows is
Multiple multi-core wires that connect the sensing electrodes to the corresponding cores
Are provided for each of the columns, and a plurality of rows corresponding to the specific detection electrodes are provided.
The end corresponding to the end of the core wire in the core wire and the adjacent detection electrode
Forward to the end of the core wire in the multi-conductor wire or to the ground electrode
A water leak monitoring device at a waste disposal site, comprising a selector for selectively connecting the resistance meter .