JPH1137886A - Device for detecting water leakage from water intercepting member using high resistance film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the presence or absence and position of a water leakage from a water intercepting member. SOLUTION: In the device for detecting water leakage of a water intercepting member 31, on whose both sides conductive substances are arranged, an inside current electrode 21 and an outside current electrode 22 are arranged on the both sides of the water intercepting member 31 having a high resistance film 32, a plurality of measuring electrodes 24 are arranged in the neighborhood of the water intercepting member 31, current is allowed to flow between the inside current electrode 21 and the outside current electrode 22, and a potential in the neighborhood of the water intercepting member 31 is measured by the measuring electrodes 24 so that water leakage of the water intercepting member 31 can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the detection of water leakage from a water barrier material.

[0002]

2. Description of the Related Art Conventional water-blocking materials are difficult to conduct electricity by themselves, but various substances such as carbon are added and mixed in order to increase weather resistance and physical strength. These substances are not necessarily preferable from the viewpoint of electrical insulation, and in most cases, the electrical insulation is impaired. Water barrier materials used at waste disposal sites can be broadly classified into synthetic rubber-based and synthetic resin-based materials. In each case, they have the property of absorbing a small amount of water (water vapor). If buried in watery waste or soil, absorb water,
Further, the electric insulation property deteriorates.

[0003] Therefore, in the case of a disposal site having a relatively large area of the impermeable material, the current flowing in and out increases even when there is no breakage of the impermeable material due to a decrease in internal and external resistance. There was a problem that the measurement accuracy of the sensitivity and the leak position deteriorated.

[0004]

[Problems to be solved by the invention]

<A> The present invention is to accurately detect the presence or absence of water leakage from a water blocking material. <B> The present invention is to accurately detect the position of water leakage from a water blocking material.

[0005]

According to the present invention, there is provided an apparatus for detecting water leakage from a water-blocking material having a conductive material disposed on both sides, wherein a first current electrode is provided in the conductive material on one side of the water-blocking material. Laying, laying a second current electrode in the conductive material on the other side of the water-blocking material, laying a plurality of measurement electrodes near the water-blocking material, placing a high-resistance film on the water-blocking material, Leakage from the impermeable material, characterized in that a current flows between the current electrode and the second current electrode, a potential in the vicinity of the impermeable material is measured by the measurement electrode, and leakage from the impermeable material is detected. In the device for detecting, or laid on the base of the waste disposal site, to detect water leakage from the impermeable material filling the waste inside, laying the first current electrode inside the impermeable material, A second current electrode is laid outside the water barrier, multiple measurement electrodes are laid near the water barrier, and a high-resistance film is placed on the water barrier. Flowing a current between the first current electrode and the second current electrode, measuring a potential near the water-impervious material with the measuring electrode, and detecting leakage from the water-impervious material. In the device that detects water leakage from

[0006]

Embodiments of the present invention will be described below with reference to the drawings. <B> Outline of device that detects water leakage from impermeable material The device that detects water leakage from impermeable material (electric leakage detection system) detects water leakage at a waste disposal site or the roof of a building. is there. Waste disposal site 1 in FIGS. 1 and 2
Of the water barrier material 3 laid on the conductive base 11
In this state, a voltage is applied to the front and back of the water-blocking material 31 by the internal current electrode 21, the external current electrode 22, and the power supply 23. Does not flow, but when broken, current flows through the damaged part. By detecting this change as a change in resistance, a change in current, a change in potential, or the like, the occurrence of breakage and its position are detected.

In other words, when the impermeable material 31 is damaged, leachate, the protective soil 12 and the waste 13 enter the damaged portion, and the leachate, the protective soil 12 and the waste 13 conduct electricity better than the impermeable material 31. Therefore, a current easily flows into and out of the water-blocking material 31 via this, and the inside and outside resistance of the broken portion of the water-blocking material becomes smaller as compared with the surroundings. Breakage is detected by detecting this difference with the measuring electrode 24, the reference electrode 25, the potentiometer 26, and the scanner 27. The larger the potential difference, the better the detection sensitivity.
For this purpose, in order to increase the insulation resistance of the water shielding material 31, it is combined with a material having high electrical insulation. Note that 14
Is a collection and distribution pipe that collects and drains water leached into the waste disposal site.

<B> Water Impermeable Material The water impermeable material 31 will be described using a water impermeable sheet as an example, but is not limited thereto, and may be any material having an electrical insulation property. For example, sheet-like water-blocking material in which asphalt is impregnated into cloth or nonwoven fabric, asphalt pavement with water tightness, water-blocking layer in which aggregate such as asphalt emulsion and sand are mixed, and plastic resin are sprayed and shaped. There are impermeable layers.

<C> When a high-resistance film is provided on the surface of the water-blocking material A high-resistance film 32 having high electrical resistance is formed on the surface of the water-blocking material 31 having water-blocking properties. As a result, the insulation resistance of the entirety of the impermeable material 31 is increased, and even when the impermeable material 31 is laid in the waste disposal site 1 having a large area, the internal and external resistance of the waste disposal site 1 can be kept high. It is possible to improve the measurement sensitivity and the measurement accuracy of the leak position of a device (electric leak detection system) for detecting a leak adopted in the waste disposal site 1.

[0010] Water barrier material 31 laid in the waste disposal site 1
Is laid on the bottom surface or the slope surface of the entire waste disposal site 1 by, for example, joining the impermeable material 31 having a width of about 1 m to 2 m by heat welding or the like. It is thought to occur due to defective parts.

The water-blocking material 31 is formed by integrally forming a high-resistance film before laying, or after laying, for example, as shown in FIG.
It is formed by applying a high resistance film 32 from above the water blocking material 31. By providing the high-resistance film 32 with a water-blocking function, as shown in FIG. 4, even if there is a defective portion 33 at the joint portion of the all-water-blocking material 31, it is covered with the high-resistance film 32.
Leakage from the defective portion 33 can be prevented, and
Reliability can be improved.

The specific resistance of the high resistance film is shown in Table 1 in relation to the thickness.
The effect can be expected within the range shown in FIG.

[0013]

[Table 1]

<D> When a high-resistance film is formed below the water-blocking material A water-blocking material 31 having a high-resistance film 32 formed on the lower surface of the water-blocking material 31
FIG. 5 shows an example in which is used in the waste disposal site 1. Impermeable material 3
By forming the high-resistance film 32 on the lower surface of the waste disposal site 1, the insulation resistance of the entire water-impervious material is increased. Can be kept high, and the measurement sensitivity and the measurement accuracy of the leak position of the electric leak detection system employed in the waste disposal site 1 can be improved.

[0015]

According to the present invention, the following effects can be obtained. <B> Because the insulation resistance of the water barrier material can be increased,
It is possible to improve the sensitivity and accuracy of the device that detects water leakage from the water barrier. <B> The water-blocking performance can be improved by imparting water-blocking to a high-resistance film exhibiting high insulation properties. In other words, when the seepage material passes through the leachate, the leachate is conductive, so that current also passes, so that the film having high insulating properties naturally has water-blocking properties against the leachate. . <C> After laying a high-resistance film exhibiting high insulation properties, the high-resistance film is provided with a water-blocking function by applying it to the water-blocking material, thereby preventing leakage from the joint of the water-blocking material. It can be prevented beforehand. <D> By basically separating the part that is responsible for the water insulation function from the part that is responsible for the water insulation function, it is not necessary to consider the electric insulation property of the material that is responsible for the water insulation function. It is possible to improve the weather resistance and physical performance of the impermeable material, for example, by freely performing it. <E> By integrating the water-blocking material and the high-resistance film, the laying operation can be performed at once, and thus the construction is facilitated.

[Brief description of the drawings]

Fig. 1 Laying diagram of current and measurement electrodes at a waste disposal site

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view of a connection portion of a water blocking material having a high resistance film.

FIG. 4 is a cross-sectional view of a connection portion of a water barrier material having a defective portion.

FIG. 5 is a diagram of a waste disposal site equipped with a water-blocking material having a high-resistance film on the lower side.

[Explanation of symbols]

 1 ・ ・ ・ Waste disposal site 11 ・ ・ Base 12 ・ ・ Protective soil 13 ・ ・ Waste 14 ・ ・ Drainage pipe 21 ・ ・ Internal current electrode 22 ・ ・ External current electrode 23 ・ ・ Power supply 24 ・ ・ Measurement electrode 25 ..Reference electrode 26..potentiometer 27..scanner 31..water barrier material 32..high resistance film 33 .. defective part

Claims (2)

[Claims] An apparatus for detecting leakage of water from a water-blocking material having conductive materials disposed on both sides, wherein a first current electrode is laid in the conductive material on one side of the water-blocking material, and the other of the water-blocking materials is provided. The second current electrode is laid in the conductive material on the side of the above, a plurality of measurement electrodes are laid in the vicinity of the impermeable material, the high resistance film is arranged on the impermeable material, and the first current electrode, the second current electrode and A device for detecting water leakage from a water-impervious material, characterized in that a current is passed between the water-impervious materials and a potential near the water-impervious material is measured by a measurement electrode to detect water leakage from the water-impervious material. 2. A device for detecting water leakage from a waterproof material laid on a base of a waste disposal site and burying waste therein, wherein a first current electrode is laid inside the waterproof material. A second current electrode is laid outside the material, a plurality of measurement electrodes are laid near the water-impermeable material, a high-resistance film is arranged on the water-impermeable material, and a first current electrode and a second current electrode are provided between the first current electrode and the second current electrode. A device for detecting water leakage from a water-impervious material, characterized in that a current is applied, a potential near the water-impervious material is measured by a measurement electrode, and water leakage from the water-impervious material is detected.