JP3431063B2 - System for detecting water leakage of impermeable sheet and method for constructing the system - 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 leak detection system for a water blocking sheet used mainly in a waste disposal site and a construction method thereof.

[0002]

2. Description of the Related Art At a waste disposal site for landfilling industrial waste and general waste, the landfilled waste is kept for a predetermined period of time so as not to adversely affect the living environment and the ecosystem.
It is necessary to store it safely, and for that purpose, a certain water shield is applied to the bottom of the repository, and the harmful substances contained in the waste leak to the outside as contaminated water and flow into the groundwater. Must be prevented.

[0003] Such water-blocking works are often constructed by laying a factory-made water-blocking sheet made of a soft synthetic resin, rubber or the like on the bottom of the disposal site. It is common to provide a protective layer made of sand or the like on the top and bottom of the water blocking sheet so that the projections included in the water blocking sheet do not damage the water blocking sheet.

However, even if such a protective layer is provided, it is difficult to completely prevent damage to the water shield sheet. Therefore, recently, whether or not the water shield sheet is damaged is monitored by a leak current detection system, Many techniques have been implemented or proposed in which mortar or the like is immediately injected for repair when the fact of damage and its location are found.

Here, when a leak current detecting system is adopted, it is necessary to appropriately install a measuring electrode for measuring a specific resistance distribution in advance or an electric field distribution of a disposal site during energization. In order to prevent the displacement of the measuring electrode due to the weight of the waste, it is necessary to install the measuring electrode on a flat portion by finding a step portion existing on the slope even on the slope.

[0006]

However, when the disposal site is, for example, a bedrock site, the slope is steep and uneven, regardless of the bottom of the disposal site. There was a problem that it was not possible to find such a place.

On slopes with steep slopes and irregularities, there is a concern that the weight of the landfill may cause displacement and it may be difficult to adapt to the irregularities. In many cases, a water-impervious sheet is used, but when rubber asphalt is used as a spray material, methods such as heat welding cannot be used, and it is difficult to attach electrodes on the water-impervious sheet. There was also a problem.

The present invention has been made in consideration of the above-mentioned circumstances, and it is possible to detect the water leakage of the water blocking sheet due to the leakage current even if the slope is steep or has a lot of unevenness. And its construction method.

[0009]

In order to achieve the above-mentioned object, the water leakage detection system for a waterproof sheet according to the present invention has a current source and a waterproof sheet connected to the current source as described in claim 1. The current electrodes respectively placed in the areas separated by, the measurement electrodes that measure various data such as the electric field distribution during energization by the current electrodes, and the shielding using the various data measured by the measurement electrodes. In a water leakage detection system for a water-blocking sheet, which comprises an arithmetic control unit for calculating the magnitude of the current leaking from the damaged portion of the water sheet and the position thereof, the measurement electrode is embedded in the sprayed mortar forming the surface of the slope. Thus, the measurement electrode is fixed to the slope, and a water-impermeable sheet sprayed on site is laid on the slope to form the water-impermeable sheet.

Further, according to the present invention, there is provided a water leakage detecting system for a water blocking sheet, wherein the current source and the currents respectively connected to the current source and provided in the regions separated by the water blocking sheet are arranged. An electrode, a measuring electrode for measuring various data such as an electric field distribution when energized by the current electrode, and a magnitude of a current leaked from a damaged portion of the water-blocking sheet by using the various data measured by the measuring electrode. And a calculation control means for calculating the position thereof, in a water leakage detection system for a water-blocking sheet, a recess is formed in a slope, and the measurement electrode is embedded in the recess to form the measurement electrode in the slope. Fixed to
A water-impermeable sheet sprayed on site is laid on the water-impermeable sheet.

According to the third aspect of the present invention, there is provided a method for constructing a water leakage detection system for a water-blocking sheet, wherein each of the current-source and the area connected to the current source and separated by the water-blocking sheet is installed. A current electrode, and a measurement electrode for measuring various data such as an electric field distribution when energized by the current electrode,
In a method of constructing a water leakage detection system for a water blocking sheet, comprising: a controller for calculating the magnitude of the current leaking from a damaged portion of the water blocking sheet and its position using various data measured by the measurement electrodes. , Pre-fixing the measurement electrode to the excavated background, and then spraying mortar on the excavated background to smooth the excavated background,
The measurement electrode is embedded in the sprayed mortar, and after the sprayed mortar is hardened, an on-site sprayed water blocking sheet is laid on the slope of the sprayed mortar to form the water blocking sheet. Further, the method for constructing a water leakage detection system for a water blocking sheet according to the present invention is, as described in claim 4, a current source and a current connected to the current source and arranged in regions separated by a water blocking sheet, respectively. An electrode, a measuring electrode for measuring various data such as an electric field distribution when energized by the current electrode, and a magnitude of a current leaked from a damaged portion of the water-blocking sheet by using the various data measured by the measuring electrode. In a method of constructing a water leakage detection system for a water-blocking sheet, which comprises an arithmetic control unit for calculating the position of the mortar, a recess is formed in the excavated surface, and the measurement electrode is placed in the recess and mortar is applied to the remaining space. The measurement electrode is filled and fixed, and then the on-site sprayed waterproof sheet is laid on the excavated ground surface as a slope to form the waterproof sheet.

In the water leakage detection system for a water blocking sheet according to the present invention, first, the measurement electrode is fixed to the slope, and then the on-site sprayed water blocking sheet which is a water blocking sheet is laid thereon.

In this case, since the measuring electrode is arranged on the back surface of the on-site spraying water blocking sheet which is the water blocking sheet, the weight of waste and other stored substances directly acts on the measuring electrode. There is no risk of misalignment.

It is arbitrary how to configure the water-blocking sheet arranged on the bottom surface of the storage space, and it may be a factory-made water-blocking sheet made of soft synthetic resin, rubber or the like. It may be composed of a field-impermeable sheet that is similar to the surface. Further, the water impermeable sheet manufactured in the factory may be a single sheet or a double sheet. Furthermore, the measurement electrode on the bottom side may be placed on the water-impervious sheet for the convenience of inspection and repair / replacement, or like the slope, it may be placed on the back surface of the water-impervious sheet. Good.

Regarding the structure for fixing the measuring electrode to the slope, the measuring electrode is fixed to the slope by embedding the measuring electrode in the spray mortar forming the surface of the slope, and It is conceivable that the above-mentioned water-impermeable sheet is constructed by laying a water-impermeable sheet sprayed on site. According to this configuration,
The laying surface of the on-site sprayed impermeable sheet becomes smooth without the measurement electrode protruding, and damage due to the weight of the stored material can be minimized.

As another structure, a concave portion is formed on the slope and the measuring electrode is embedded in the concave to fix the measuring electrode to the slope, and the spraying on site is shielded on it. It is conceivable that a water sheet is laid to serve as the water-impermeable sheet. Also with this configuration, the measurement electrodes are prevented from protruding, and the laying surface of the on-site sprayed water-impervious sheet is made smooth, and damage due to the weight of the stored material can be minimized.

The water leakage detection system for water-blocking sheets according to the above-mentioned invention is mainly intended for application to a waste disposal site, but it is necessary to monitor water leakage underground such as in reservoirs. It goes without saying that it can be applied to facilities.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a water leakage detection system for a water blocking sheet and a method for constructing the same according to the present invention will be described below with reference to the accompanying drawings. It should be noted that parts and the like which are substantially the same as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an overall view and a block diagram showing a water leakage detection system for a water blocking sheet according to this embodiment.
As can be seen in the figure, the water leakage detection system 1 for a water blocking sheet according to the present embodiment is applied to a waste disposal site, and includes a current source 2 and a pair of current electrodes connected to the current source. 3, 3 and a large number of measuring electrodes 4, 5 for measuring various data such as electric field distribution during energization by the current electrodes, an electrode switching device 6 for switching the measuring electrodes, and measuring electrodes 4, 5
The controller 7 as the arithmetic control means for calculating the magnitude and the position of the current leaking from the damaged portion existing in the water blocking sheets 10 and 11 by using the data measured in 1., the monitor 8 for outputting the arithmetic processing result, and The printer 9 is generally constituted by the printer 9.

Here, the measuring electrode 4 is installed on the water-blocking sheet 10 arranged on the bottom surface of the repository, as in the conventional case. The water-impermeable sheet 10 can be made of a factory-made water-impermeable sheet made of soft synthetic resin, rubber or the like.

On the other hand, the measuring electrode 5 is installed on the back side of the water blocking sheet 11 arranged on the slope of the disposal site, and as can be seen clearly in FIG. It is embedded in the attached mortar 24. The water impervious sheet 11 is composed of a field impervious sheet.

In order to construct the water leakage detection system 1 for the water-blocking sheet according to this embodiment, first, as shown in FIG.
After preliminarily fixing the mortar to the digging ground 31 as shown in FIG.
For example for several cm to smooth the excavated background 31, and the measurement electrode 5 is embedded in the mortar.

Next, after the spray mortar 24 has hardened,
As shown in FIG. 3C, a base cloth 33 formed of a woven cloth or a non-woven cloth is fixed to the slope 23 with anchor pins or the like, and then a rubber asphalt solution 35 is sprayed on the base cloth 33.
And a rubber asphalt layer is formed on the surface thereof to obtain the on-site sprayed water-impervious sheet 11 as shown in FIG.

In this way, since the measuring electrode 5 is arranged on the back surface of the on-site spraying water blocking sheet 11 which is a water blocking sheet, the weight of the waste stored in the disposal site is the measuring electrode. It does not act directly on 5.

When laying the on-site sprayed water-blocking sheet 11, a weather resistance may be improved by coating the surface of the rubber asphalt layer with a coating method or the like, if necessary.

Further, due to the leakage current, the waterproof sheet 10,
The method for detecting the damaged portion of 11 is similar to the conventional method. For example, the specific resistance distribution is measured in advance by the measuring electrodes 4 and 5, and then the current source 2 from the current source 2 via the current electrodes 3 and 3. An electric current is applied to the inside and outside of the impermeable sheets 10 and 11 as needed. At this time, if the water blocking sheets 10 and 11 have a damaged portion, a current leaks from the damaged portion. Therefore, the electric field distribution at this time is measured by the measuring electrodes 4 and 5. Since the spray mortar 24 has a certain electric conductivity, the measurement electrode 5
However, even if it is embedded in the mortar, there will be no inconvenience in measurement.

Next, the controller 7 obtains the magnitude and position of the leakage current from the electric field distribution and the previously obtained specific resistance distribution, and outputs the result to the monitor 8 or the printer 9 to output the water-blocking sheet 10. 11 points of damage and their sizes are specified. When obtaining the specific resistance distribution or the electric field distribution, the measurement electrodes 4 and 5 are switched appropriately.

As described above, according to the water leakage detection system 1 for a water blocking sheet and the method for constructing the same according to the present embodiment, the measurement electrode 5 is provided on the back surface of the on-site sprayed water blocking sheet 11 which is a water blocking sheet. Since the waste is stored in the disposal site, the weight of the waste stored in the disposal site does not directly act on the measuring electrode 5 to cause a positional deviation.

Therefore, the measuring electrode 5 can be installed even on a slope having steep slopes and irregularities, and it is possible to detect water leakage of the water shield sheets 10 and 11 due to leakage current.

Further, according to the water leakage detection system 1 for a water blocking sheet and the method for constructing the same according to the present embodiment, the measurement electrode 5 is embedded in the sprayed mortar 24 constituting the surface of the slope 23. Since the projecting electrodes are prevented from projecting and the laying surface of the on-site sprayed water-blocking sheet 11, that is, the slope 23 is made smooth, damage to the water-blocking sheet due to the weight of waste can be minimized, and measurement By embedding the measuring electrode 5 in the spray mortar 24 having a certain strength, it is possible to prevent the measuring electrode 5 from being damaged due to the weight of waste. Also, the measuring electrode 5
Since only the work of attaching the anchor to the excavated surface 31 with an anchor pin or the like is added to the conventional process, the construction period is not so long.

In this embodiment, the measuring electrode 5 is fixed to the excavated surface 31 in advance, and then the excavated surface is covered with the spray mortar 24 so that the measuring electrode 5 is embedded in the mortar. When it is not necessary to cover the excavated ground 31 with spray mortar, a recess 42 is formed in the excavated ground 41 and the measurement electrode 5 is arranged in the recess as shown in FIG. At the same time, the residual space is filled with mortar 43 to fix the measurement electrode 5, and then the site sprayed water-impervious sheet 11 is laid on it with the excavated surface 41 as the slope and in the same procedure as described above. You may With this configuration as well, it is possible to obtain substantially the same effect as that of the above-described embodiment, and the measurement electrode 5 is embedded in the mortar 43 having a certain strength.
There is also an effect that it is possible to prevent the measurement electrode 5 from being damaged by the weight of waste.

Further, in the present embodiment, the on-site sprayed water-impervious sheet is constructed by spraying the rubber asphalt solution on the base cloth, but how to construct the on-site sprayed water-impervious sheet is arbitrary. For example, a slow-coagulating, permeating liquid mixture obtained by mixing two liquids of an anionic rubber asphalt emulsion containing a metal oxide or an asphalt emulsion and an aqueous ammonium salt solution containing an alcohol or its derivative as a gelling agent is used as a porous sheet. (See Japanese Patent No. 2524638), spraying a mixed solution of hydrophilic urethane prepolymer, water and asphalt emulsion onto a non-woven fabric, spraying a rubber asphalt emulsion and an aqueous solution of a polyvalent metal salt almost at the same time and mixing them by contact. Depending on the method, it can be solidified on the adhesion surface. It may be.

[0033]

As described above, according to the water leakage detection system for a water blocking sheet and the method for constructing the same according to the present invention, the measurement electrodes are arranged on the back surface of the on-site sprayed water blocking sheet which is the water blocking sheet. Therefore, there is no possibility that the weight of the waste stored in the disposal site directly acts on the measuring electrode and the position is displaced. Therefore, it is possible to install the measurement electrode even on a steep slope or uneven slope.
It is possible to detect water leakage of the impermeable sheet due to leakage current.

Further, according to the water leakage detection system for a water blocking sheet and the method for constructing the same according to the present invention, the projection of the measuring electrode is prevented and the laid surface of the on-site sprayed water blocking sheet becomes smooth, so that the waste It is possible to minimize damage to the water-impermeable sheet due to weight, and it is possible to prevent damage to the measurement electrode due to the weight of waste material.

[0035]

[Brief description of drawings]

FIG. 1 is an overall view and a block diagram showing a water leakage detection system for a water blocking sheet according to the present embodiment.

[Fig. 2] On-site sprayed waterproof sheet 1 laid on slope 23
1 is a detailed cross-sectional view showing 1 and a measuring electrode 5 arranged on the back surface thereof.

FIG. 3 is a construction diagram showing a procedure for installing the measuring electrode 5 and laying the on-site sprayed water blocking sheet 11.

FIG. 4 is a detailed cross-sectional view showing a modified example of the installation of the measurement electrode 5 and the on-site sprayed waterproof sheet 11.

[Explanation of symbols]

1 Leakage detection system for water-impervious sheet 2 Current source 3 Current electrodes 4, 5 Measurement electrode 7 Controller (arithmetic control means) 10 Water-impervious sheet 11 Water-impervious sheet (field-imposed water impervious sheet) 23 Slope 24 Spray mortar 41 Slope 42 Recess

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01M 3/40 B09B 1/00 ZAB G01M 3/04

Claims (4)

(57) [Claims] 1. A current source, and current electrodes respectively connected to the current source and provided in regions separated by a water-blocking sheet.
A measurement electrode for measuring various data such as an electric field distribution at the time of energization by the current electrode, and the magnitude and position of the current leaked from the damaged portion of the waterproof sheet using the various data measured by the measurement electrode In a water leakage detection system for a water-blocking sheet consisting of an arithmetic and control unit for calculating, the measurement electrode is fixed to the slope by embedding the measurement electrode in a spray mortar forming the surface of the slope. A water-impervious sheet leakage detection system, characterized in that a water-impermeable sheet sprayed on site is laid on it to form the water-impermeable sheet. 2. A current source, and current electrodes connected to the current source and provided in regions separated by a water-blocking sheet, respectively.
A measurement electrode for measuring various data such as an electric field distribution at the time of energization by the current electrode, and the magnitude and position of the current leaked from the damaged portion of the waterproof sheet using the various data measured by the measurement electrode In a water leakage detection system for a water-blocking sheet, which comprises an arithmetic and control unit for calculating, a concave portion is formed on a slope, and the measuring electrode is embedded in the concave portion to fix the measuring electrode to the slope. A water-impervious sheet leakage detection system, wherein a site-imposed water impervious sheet is laid on the sheet to form the water-impermeable sheet. 3. A current source, and current electrodes which are respectively connected to the current source and arranged in regions separated by a water-blocking sheet,
A measurement electrode for measuring various data such as an electric field distribution at the time of energization by the current electrode, and the magnitude and position of the current leaked from the damaged portion of the waterproof sheet using the various data measured by the measurement electrode In the method of constructing a water leakage detection system for a water-blocking sheet, which comprises an arithmetic control unit for calculating, the measurement electrode is preliminarily fixed to the excavated surface, and then the excavated surface is coated with spray mortar. Smoothing, and embedding the measurement electrode in the sprayed mortar, after the sprayed mortar has hardened, lay an on-site sprayed waterproof sheet on the slope to form the waterproof sheet. A method for constructing a water leakage detection system for water-blocking sheets. 4. A current source, and current electrodes which are respectively connected to the current source and arranged in regions separated by a water-blocking sheet,
A measurement electrode for measuring various data such as an electric field distribution at the time of energization by the current electrode, and the magnitude and position of the current leaked from the damaged portion of the waterproof sheet using the various data measured by the measurement electrode In a method of constructing a water leakage detection system for a water-blocking sheet, which comprises an arithmetic control unit for calculating, a recess is formed in the excavated surface, the measurement electrode is placed in the recess, and the remaining space is filled with mortar. Construction of a leak detection system for water-impervious sheets, characterized in that the measurement electrodes are fixed, and then the on-site sprayed water-impervious sheet is laid on the excavated ground surface as a slope to form the water impervious sheet. Method.