JP3657931B2 - Impermeable structure and water leakage detection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-blocking structure and a water leakage detection method, and more specifically, is provided in a waste disposal site or the like, and has a highly reliable water-blocking structure that can easily detect water leakage in a water-blocking layer. The present invention also relates to a water leakage detection method for detecting water leakage of the water shielding structure.
[0002]
[Prior art]
In facilities such as waste disposal sites, leachate that does not meet drainage standards that can contaminate groundwater and rivers can occur. Such a disposal site is usually used after providing a water-impervious layer made of a water-impervious sheet or the like laid along a recess in the ground and installing a sand layer or cover soil. In addition, in such a disposal site, in order to confirm that contaminated water does not flow out to the surrounding environment when laying a water shielding sheet, setting a sand layer or cover soil, or operating as a disposal site, Water leakage inspection is performed to detect whether the water shielding sheet is damaged.
[0003]
Conventionally, as a water leakage detection method for performing such a water leakage inspection, for example, a current is supplied from a power source to the ground on which a water shielding sheet is laid to form a lower electrode, and an upper electrode is provided above the water shielding sheet. A method of detecting leakage of the water shielding sheet by measuring the current, potential or electric resistance between the lower electrode and the upper electrode is used.
[0004]
In recent years, due to increasing interest in the impact on the natural environment and living area, there has been a demand for something that ensures safety, and a double water-impervious structure that has improved water shielding performance by providing double water-impervious layers. A water-blocking structure having the above has been applied. The double water-impervious structure consists of a water-impervious layer made of a water-impervious sheet and a water-impervious layer made of a hardly water-permeable soil impermeable layer provided on the lower side (outside) of the water-impervious sheet. For example, a water structure. As the soil impermeable layer, one containing bentonite is often used. The soil impermeable layer containing bentonite has the advantage of being highly swellable and having an excellent water shielding effect, but if water is supplied due to rain, etc., it becomes mud and the workability and quality are significantly reduced. There is a drawback that it will. For this reason, after forming the soil impermeable layer, a vinyl sheet or the like that covers the surface of the soil impermeable layer and protects the soil impermeable layer from rainfall or the like is often installed.
[0005]
Conventionally, a vinyl recess that covers the surface of the recess to protect the surface from rainfall while the surface of the recess is exposed is provided in the recess of the ground for providing the water shielding structure. Sheets may be installed.
[0006]
However, when such a vinyl sheet is installed between the water-impervious layer composed of the water-impervious sheet and the ground, even if the water leakage detection method described above is used to detect water leakage of the water-impervious sheet, the vinyl sheet Since the sheet becomes an insulating layer and the lower electrode and the upper electrode are insulated, there is a problem that water leakage of the water shielding sheet cannot be detected.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and even when a layer having an insulating property is provided between the water-impervious layer composed of a water-impervious sheet and the ground, the water-impervious layer is easily provided. An object of the present invention is to provide a highly reliable water shielding structure capable of detecting water leakage.
Moreover, it is the water leak detection method which detects the water leak of said water-impervious structure, It aims at providing the water leak detection method which can detect a water leak easily.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the water-impervious structure of the present invention is a water-impervious structure including a water-impervious portion laid along a recess in the ground,
The water shielding portion is provided with an insulating water shielding layer, an upper electrode provided on the inner side of the water shielding layer, used for detecting water leakage of the water shielding layer, and provided on the outer side of the water shielding layer. And a lower electrode used for water leakage detection of the water shielding layer,
The lower electrode has a first conductive layer provided in contact with the water shielding layer, and a second conductive layer located outside the first conductive layer,
Between the first conductive layer and the second conductive layer, there is provided a coating layer that has an insulating property and covers the second conductive layer, and the first conductive layer and the second conductive layer. A conductive portion for electrically connecting the layers is provided.
[0009]
In the water-blocking structure of the present invention, the lower electrode has a first conductive layer provided in contact with the water-blocking layer, and a second conductive layer positioned outside the first conductive layer, Since the conductive portion for electrically connecting the first conductive layer and the second conductive layer is provided, a current is supplied from the power source to the second conductive layer, and a current is passed through the first conductive layer through the conductive portion. Can do. Accordingly, a high-quality second conductive layer covered with a coating layer having an insulating property is provided, and water can be easily blocked by a method of measuring a current, a potential, or an electric resistance between the lower electrode and the upper electrode. It is possible to realize a water-blocking structure capable of detecting the leakage of the layer.
[0010]
Moreover, in said water-impervious structure, the said conduction | electrical_connection part shall be provided with two or more.
By setting it as such a water-impervious structure, in the area | region between one conduction | electrical_connection part and other conduction | electrical_connection part among the several conduction | electrical_connection parts, it consists of a 1st conductive layer and a 2nd conductive layer. Two conduction paths are formed, and it is possible to supplement the conductivity between the first conductive layer and the second conductive layer.
Therefore, the distance that the current must flow through the first conductive layer when there is a leaking part in the water shielding layer is the damage of the water shielding layer from the damaged part of the water shielding layer among the plurality of conductive parts. It is only the distance to the conducting part closest to the location. Therefore, even if the distance from the portion where the current is supplied to the lower electrode to the damaged portion of the water shielding layer is long, the current flows in the first conductive layer as compared with the case where the lower electrode is composed of only the first conductive layer. The flowing distance can be shortened.
[0011]
Further, for example, when the first conductive layer is made of a non-woven fabric in a wet state, the first conductive layer may not be sufficiently conductive, so that the first conductive layer is affixed with an aluminum sheet. It has been proposed to consist of a non-woven fabric. However, the nonwoven fabric on which the aluminum sheet is affixed is very expensive and not practical.
On the other hand, in the above-described water-impervious structure, since the second conductive layer can supplement the conductivity of the first conductive layer by providing a plurality of conductive portions, the conductivity of the first conductive layer is insufficient. Even in this case, the conductivity of the lower electrode can be sufficiently ensured. Therefore, the reliability of the water leakage inspection of the water shielding layer can be improved, and a water shielding structure having excellent reliability can be provided.
[0012]
In the above-described water-blocking structure, the water-blocking layer may be a water-blocking sheet, and the first conductive layer may be the non-woven fabric.
In such a water-blocking structure, the first conductive layer can be formed simply by laying the nonwoven fabric and making it wet, and the water-blocking layer can be formed only by laying the water-blocking sheet. Installation is easy and hassle-free. Furthermore, since the material itself is also inexpensive, an inexpensive water shielding structure can be easily provided.
[0013]
Furthermore, in the above-described water-impervious structure, the covering layer may be a resin sheet that protects the surface of the second conductive layer, and the second conductive layer may be a soil impermeable layer. .
In the present specification, the “soil impermeable layer” refers to a soil layer having a water permeability of 10 ⁻⁶ or less.
[0014]
Such a water-blocking structure has a double water-blocking structure in which the second conductive layer is a soil-type water-proof layer, and is double-blocked by the water-proof layer and the soil-type water-proof layer. The performance can be improved and a highly reliable water shielding structure can be obtained. Moreover, the 2nd conductive layer which consists of a soil water-impervious layer can function as a protective layer which absorbs the impact from an upper part, etc. and protects a water-impervious layer. Furthermore, since the soil water-impervious layer is higher in conductivity than the wet nonwoven fabric, the second conductive layer is made of a soil water-impervious layer, so that the lower part has excellent conductivity. An electrode can be obtained and the reliability in the water leak detection of a water shielding layer can be improved. Such a water-impervious structure is particularly preferably applied to a management-type disposal site where the application of a double water-impervious structure is obligatory.
[0015]
Moreover, since the coating layer is a resin sheet that protects the surface of the second conductive layer, it is possible to prevent the workability and quality of the second conductive layer from being deteriorated due to rain or the like, and a high-quality water-blocking structure. Is obtained. Moreover, since the coating layer is a resin sheet, the coating layer can be easily formed by laying the resin sheet. Furthermore, since the resin sheet is generally a long one having a certain width, when forming a large-scale water shielding structure, it is determined by the width of the resin sheet when laying the resin sheet. A seam between the resin sheet and the resin sheet is formed at regular intervals. For example, when forming a large-scale water-impervious structure having a plurality of conductive portions, a plurality of conductive portions can be obtained by utilizing the seam between the resin sheet and the resin sheet formed at regular intervals as described above. Can be easily formed at equal intervals.
[0016]
In the above-described water-blocking structure, the conducting portion is made of a sheet-like conductive material, and the upper layer is provided so that the sheet-like conductive material is in contact with the first conductive layer and the covering layer. A side part and the lower layer side part provided so that the said sheet-like electrically-conductive material may contact the said coating layer and the said 2nd conductive layer may be included.
By using such a water-blocking structure, it is possible to prevent the conductive portion from affecting the thickness of the first conductive layer and the thickness of the second conductive layer. For example, compared to the case where the conductive portion is not provided. Thus, there is no need to greatly change the thickness of the first conductive layer or the second conductive layer, or to change the material of the first conductive layer or the second conductive layer. Moreover, according to such a water-blocking structure, a 1st conductive layer and a 2nd conductive layer can be reliably conduct | electrically_connected.
[0017]
In the above-described water-blocking structure, the conducting portion is an intermediate portion provided between the upper layer side portion and the lower layer side portion so that both surfaces of the sheet-like conductive material are in contact with the coating layer. It can have.
According to such a water-blocking structure, by providing the conductive portion, a region that is not covered with the coating layer does not occur in the second conductive layer.
In addition, when the conductive portion having such an upper layer side portion, a lower layer side portion, and an intermediate portion is formed by laying a sheet-like material as well as the conductive portion, for example, A sheet-like material that forms a conductive portion in a portion where the sheet-like material that overlaps the sheet-like material that forms the covering layer is overlapped with each other at the joint between the sheet-like material that forms the covering layer and the sheet-like material. The conductive material can be easily formed by inserting the conductive material therebetween.
[0018]
Moreover, in said water-impervious structure, the said coating layer shall have water impermeability.
By setting it as such a water-impervious structure, a water-impervious structure can be improved further and a more reliable water-impervious structure can be obtained.
[0019]
In order to solve the above problems, the water leakage detection method of the present invention is a water leakage detection method for detecting water leakage of the water shielding structure according to any of the above,
While flowing a current through the upper electrode, a current is passed through the lower electrode by flowing a current through the first conductive layer through the second conductive layer and the conductive portion,
The leakage of the water shielding layer is detected by measuring a current flowing between the upper electrode and the lower electrode.
[0020]
According to the water leakage detection method of the present invention, even if a covering layer that has an insulating property and covers the second conductive layer is provided between the water shielding layer and the second conductive layer, the second conductive material is supplied from the power source. If the current is supplied to the layer, the current is supplied to the first conductive layer through the conducting part. Therefore, the leakage of the water shielding layer can be easily detected by measuring the current flowing between the upper electrode and the lower electrode. can do.
[0021]
In the water leakage detection method described above, it is preferable that a current is passed from the ground outside the water shielding portion to the second conductive layer.
By adopting such a water leakage detection method, even if a covering layer that covers the second conductive layer is provided between the water shielding layer and the ground, current is supplied from the power source to the ground. Then, since the current is supplied to the lower electrode, it is possible to more easily detect water leakage in the water shielding layer.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the water-blocking structure and the water leakage detection method of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a waste disposal site to which the water-impervious structure of the present invention is applied. In FIG. 1, only two of the plurality of conductive portions are shown as representatives in order to make the drawing easier to see. FIG. 2 is an enlarged plan view showing a part of the water shielding structure shown in FIG. In FIG. 2, only the resin material that forms the coating layer and the conductive material that forms the conductive portion are shown in order to explain the planar arrangement of the conductive portion. FIG. 3 is an enlarged cross-sectional view showing a part of the water shielding structure shown in FIG.
[0023]
The waste disposal site shown in FIG. 1 includes a recess in the ground 1 and a water-impervious portion 2 provided along the recess in the entire area within the recess. In this waste disposal site, the waste is dumped into the impermeable portion 2. Further, sewage generated by rainwater or the like is prevented from leaching out of the water shielding part 2 by the water shielding part 2.
[0024]
The concave portion of the ground 1 can be artificially formed by excavating downward from the ground surface, and when using a valley or a valley such as a mountainous area, the topography thereof can also be used.
As shown in FIG. 1, the water-impervious portion 2 includes a soil water-impervious layer 6 (corresponding to a “second conductive layer” in the claims), a covering layer 3, and a lower nonwoven fabric 12 (in the claims). (Corresponding to “first conductive layer”), water shielding layer 5, upper nonwoven fabric 13 (corresponding to “upper electrode” in claims), and sand layer or lining 4 are provided in this order from the ground 1 side. It is what was done.
[0025]
The sand layer or the cover soil 4 is adjacent to the waste, and is installed to protect the water shielding layer 5 from an impact or the like when the waste is dumped. In addition, the sand layer or the cover soil 4 is formed by installing sand or soil until the height necessary for protecting the water shielding layer 5 is reached.
[0026]
The water-impervious layer 5 may be any thickness and material as long as necessary water-impervious, durable, and insulating properties can be obtained, but is preferably formed of a synthetic rubber or plastic water-impervious sheet. . Specifically, linear low density polyethylene (LLDPE), medium density polyethylene (MDPE) manufactured with a metallocene catalyst, linear low density polyethylene (LLDPE), medium density polyethylene manufactured with a Ziegler-Natta catalyst. A water shielding sheet formed from an olefin resin such as (MDPE) is preferably used. Moreover, when using a water shielding sheet, in order to improve the water shielding performance, a plurality of sheets may be used as necessary.
[0027]
Any material can be used as the lower nonwoven fabric 12 and the upper nonwoven fabric 13 as long as they can be laid and can obtain predetermined conductivity by being in a wet state.
[0028]
The soil impervious layer 6 has poor water permeability formed by a mixed soil obtained by mixing a locally generated soil generated by excavation of the ground 1 for providing a recess, etc. with bentonite (a very fine clay particle). Is. In the water-impervious structure shown in FIG. 1, since the soil water-impervious layer 6 has poor water permeability, the water-impervious layer 5 and the soil water-impervious layer 6 have a double water-impervious structure that doubles water. Yes. The soil impermeable layer 6 has conductivity and is electrically connected to the ground 1. Furthermore, the soil impermeable layer 6 also functions as a protective layer that protects the impermeable layer 5 by absorbing impacts from above.
[0029]
As the covering layer 3, any soil-impervious layer 6 can be coated as long as it has a water-impervious property capable of preventing the soil impervious layer 6 from becoming mud due to rain or the like, thereby preventing deterioration in workability and quality. Even a thickness or material can be used. The covering layer 3 is preferably a sheet-like layer that can cover the soil impermeable layer 6 by laying on the surface of the soil impervious layer 6. For example, the covering layer 3 is formed of the same material as the above-described impermeable layer 5. Is done.
In this embodiment, the coating layer 3 is formed of a long resin sheet having a certain width. As shown in FIG. 2, a seam 3 c between the resin sheet and the resin sheet is formed in the covering layer 3 in a band shape. The seam 3c exists at a predetermined interval determined by the width of the resin sheet to be the coating layer 3. Further, the seam 3c is formed by laying a resin sheet so as to correspond to the surface shape of the soil impermeable layer 6, and as shown in FIGS. Adjacent resin sheets 3a and 3b are overlapped with each other.
[0030]
Further, the water shielding portion 2 includes an upper electrode and a lower electrode that are used for detecting water leakage of the water shielding layer 5. The upper electrode is constituted by the upper nonwoven fabric 13. Further, the lower electrode is constituted by the lower nonwoven fabric 12 and the soil impermeable layer 6, and the lower nonwoven fabric 12 and the soil impermeable layer 6 are electrically connected by a plurality of conducting portions 15 as shown in FIGS. 1 and 3. It is connected to the.
[0031]
The conductive portion 15 may be formed of any material as long as it has conductivity. For example, metal such as iron, copper, lead, aluminum, palladium, polyaniline, polyacetylene, polypyrrole, polythiophene, polyacene, polypara Examples thereof include conductive polymers such as phenylene, carbon black, and graphite.
The conducting portion 15 may have any shape and size as long as the lower nonwoven fabric 12 and the soil impermeable layer 6 can be conducted, but the conducting portion 15 is preferably made of a sheet-like conductive material 14.
[0032]
In this embodiment, the conduction | electrical_connection part 15 consists of a sheet-like electroconductive material 14, and as shown in FIG. 3, the upper layer side part provided so that the electroconductive material 14 might contact the lower nonwoven fabric 12 and the coating layer 3 was shown. 15a, a lower layer side portion 15b provided so that the conductive material 14 is in contact with the coating layer 3 and the soil impermeable layer 6, and an upper layer side portion 15a and a lower layer side portion 15b. The intermediate portion 15c is in contact with the coating layer 3 on both sides. The upper layer side portion 15a, the lower layer side portion 15b, and the intermediate portion 15c are formed by inserting the conductive material 14 into a portion where the adjacent resin sheets 3a and 3b are overlapped.
Moreover, in this embodiment, as shown in FIG. 2, the conduction | electrical_connection part 15 is provided with two or more, and arrange | positions at equal intervals by utilizing the joint 3c of the resin sheet and resin sheet which were formed at fixed intervals. Has been.
[0033]
Next, a water leak detection method for detecting the water leak of the water shielding structure shown in FIGS. 1 to 3 will be described.
In order to detect leakage of the water-impervious structure, first, the power source 9 and the current measuring means 10 are provided.
[0034]
As shown in FIG. 1, the power source 9 includes an upper inspection electrode 81 embedded in the sand layer or the covering soil 4 and disposed on the upper nonwoven fabric 13, and a lower side disposed on the ground 1 outside the water shielding portion 2. It has an inspection electrode 82 and supplies current to the upper inspection electrode 81 and the lower inspection electrode 82.
The upper inspection electrode 81 and the lower inspection electrode 82 used here may be any material as long as they are conductive, for example, metals such as iron, copper, lead, aluminum, palladium, polyaniline, polyacetylene, polypyrrole. , Conductive polymers such as polythiophene, polyacene, and polyparaphenylene, carbon black, and graphite. Further, the upper inspection electrode 81 and the lower inspection electrode 82 may have any shape such as a flat plate or a columnar shape, and a protrusion or the like may be provided on the installation surface side in order to improve retention.
The current measuring means 10 measures the current that flows between the upper inspection electrode 81 and the lower inspection electrode 82, and flows between the upper inspection electrode 81 and the lower inspection electrode 82. Any device capable of measuring current can be used.
[0035]
Next, a current is supplied to the upper inspection electrode 81 from the power source 9, thereby causing a current to flow through the upper nonwoven fabric 13. Further, by supplying a current from the power source 9 to the lower inspection electrode 82, a current flows from the ground 1 outside the water shielding portion 2 to the lower nonwoven fabric 12 through the soil impermeable layer 6 and the conduction portion 15. Then, by measuring the current flowing between the upper inspection electrode 81 and the lower inspection electrode 82 by the current measuring means 10, it is possible to detect the presence or absence of water leakage in the water shielding layer 5.
[0036]
For example, when the portion indicated by reference numeral 5a in FIG. 1 of the water shielding layer 5 is broken, the current supplied from the lower inspection electrode 82 is mainly compared with the lower nonwoven fabric 12 as indicated by the arrow 9a. Then, it flows through the soil impermeable layer 6 having high conductivity and reaches the damaged portion of the impermeable layer 5. At this time, the distance that the current supplied from the lower inspection electrode 82 must flow through the lower nonwoven fabric 12 is from the damaged part of the water shielding layer 5 to the conduction part 15 closest to the damaged part of the water shielding layer 5. This is only the distance indicated by the arrow 9b. As the distance flowing through the lower nonwoven fabric 12 is shorter, the conductivity from the lower inspection electrode 82 to the damaged portion of the water shielding layer 5 is improved, and the current easily flows. Moreover, the distance which flows through the inside of the lower nonwoven fabric 12 can be shortened effectively by increasing the number of the conduction parts 15.
[0037]
According to such a water-impervious structure and the water leakage detection method, the covering layer 3 having insulation and covering the soil impermeable layer 6 is provided between the impermeable layer 5 and the soil impermeable layer 6. Even if the current is supplied from the power source 9 to the ground 1 outside the impermeable portion 2, the electric current is supplied to the lower nonwoven fabric 12 through the soil impermeable layer 6 and the conductive portion 15. Accordingly, by measuring the current flowing between the upper inspection electrode 81 and the lower inspection electrode 82, the current flowing between the upper nonwoven fabric 13 and the lower nonwoven fabric 12 can be measured, and water shielding is easily performed. The water leakage of the layer 5 can be detected.
Moreover, since the electroconductivity from the electrode 82 for a lower test | inspection to the damaged location of the water shielding layer 5 can be improved, the reliability in the water leak detection of the water shielding layer 5 can be improved.
[0038]
In addition, the water-impervious structure and the water leakage detection method of the present invention are not limited to the above-described embodiments. For example, instead of the lower nonwoven fabric 12 and the upper nonwoven fabric 13, a layer made of a conductive material is provided. May be.
[0039]
In addition, when sufficient water shielding performance can be obtained with only the water shielding layer 5, it is not necessary to have poor water permeability. Therefore, instead of the soil water shielding layer 6, a protective soil layer for protecting the water shielding layer 5 is provided. It may be provided. Furthermore, if the impermeable layer 5 can be sufficiently protected in the recess of the ground 1, the soil impermeable layer 6 or the protective soil layer provided in place of the soil impermeable layer 6 may not be formed.
Further, as described above, it is desirable that a plurality of the conductive portions 15 are provided, but it is sufficient that at least one conductive portion 15 is provided, and there is no particular limitation.
Moreover, the conduction | electrical_connection part 15 should just be what can connect the lower nonwoven fabric 12 and the soil water-impervious layer 6, for example, when laying the lower nonwoven fabric 12, the penetration layer 3 is penetrated to the coating layer 3. For example, the lower nonwoven fabric 12 and the soil water-impervious layer 6 may be in direct contact with each other.
[0040]
Further, in order to improve the water shielding performance and to fix the position of the resin sheet and the conducting portion 15, between the adjacent resin sheets 3a and 3b, or between the adjacent resin sheets 3a and 3b and the conductive material 14. May be adhered by an adhesive or the like.
[0041]
Further, the upper inspection electrode 81 and the lower inspection electrode 82 are installed at any position as long as it can detect that the current supplied from the power source 9 flows through the water leakage portion of the water shielding layer 5. May be.
For example, the upper inspection electrode 81 is preferably installed so as to be in direct contact with the upper nonwoven fabric 13 as shown in the above-described example in order to reliably supply current to the upper nonwoven fabric 13. It may be arranged on the sand layer or the covering soil 4 at the stage when the construction is completed. In this case, an electric current is supplied to the upper nonwoven fabric 13 through the sand layer or the covering soil 4.
The lower inspection electrode 82 may be embedded in the soil impermeable layer 6 or may be embedded in the ground 1.
[0042]
Moreover, the water leak detection method of this invention can be used conveniently also in the stage before providing a sand layer or the covering soil 4, the time of operation used as a disposal site, etc.
[0043]
【The invention's effect】
As described above, according to the water-blocking structure and the water leakage detection method of the present invention, it is possible to supply current to the lower electrode by flowing current to the first conductive layer through the second conductive layer and the conductive portion. it can. Therefore, even if a coating layer that has insulating properties and covers the second conductive layer is provided between the water shielding layer and the second conductive layer, a current is supplied from the power source to the second conductive layer. A current can be supplied to the first conductive layer through the conducting portion, and leakage of the water shielding layer can be easily detected by measuring a current flowing between the lower electrode and the upper electrode.
[0044]
Further, by providing a plurality of conductive portions, the conductivity of the first conductive layer can be supplemented by the second conductive layer. Therefore, even when the distance from the portion where the current is supplied to the lower electrode to the damaged portion of the water shielding layer is long, the current flows in the first conductive layer as compared with the case where the lower electrode is composed of only the first conductive layer. The flowing distance can be shortened. Therefore, even when the conductivity of the first conductive layer is insufficient, the conductivity of the lower electrode can be sufficiently ensured.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an example of a waste disposal site to which a water shielding structure of the present invention is applied.
2 is an enlarged plan view showing a part of the water-impervious structure shown in FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view of a part of the water shielding structure shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ground 2 ... Water shielding part 3 ... Coating layer 3a, 3b ... Resin sheet 3c ... Seam 4 ... Sand layer or covering soil 5 ... Water shielding layer 6 ... Soil water shielding layer 12 ... Lower nonwoven fabric 13 ... Upper nonwoven fabric 14 ... Conductive material 15 ... Conducting portion 15a ... Upper layer side portion 15b ... Lower layer side portion 15c ... Intermediate portion 81 ... Upper inspection electrode 82 ... Lower inspection electrode 10 ... Current measuring means 9 ... Power source

Claims (9)

A water-impervious structure comprising a water-impervious portion provided along a recess in the ground,
The water shielding portion is provided with an insulating water shielding layer, an upper electrode provided on the inner side of the water shielding layer, and used for detecting water leakage of the water shielding layer, and provided on the outer side of the water shielding layer. A lower electrode used for detecting water leakage in the water shielding layer,
The lower electrode has a first conductive layer provided in contact with the water shielding layer, and a second conductive layer located outside the first conductive layer,
Between the first conductive layer and the second conductive layer, there is provided a coating layer that has insulating properties and covers the second conductive layer, and the first conductive layer and the second conductive layer. A water shielding structure characterized in that a conductive portion for electrically connecting the layer is provided. The water shielding structure according to claim 1, wherein a plurality of the conductive portions are provided. The water-impervious structure according to claim 1 or 2, wherein the water-impervious layer is a water-impervious sheet, and the first conductive layer is the nonwoven fabric. The said coating layer is a resin sheet which protects the surface of the said 2nd conductive layer, The said 2nd conductive layer is a soil water-impervious layer, The Claim 1 thru | or 3 characterized by the above-mentioned. Water shielding structure. The conducting portion is made of a sheet-like conductive material,
An upper layer side portion provided so that the sheet-like conductive material is in contact with the first conductive layer and the covering layer;
5. The shielding according to claim 1, wherein the sheet-like conductive material has a lower layer side portion provided so as to be in contact with the covering layer and the second conductive layer. Water structure. The conductive portion has an intermediate portion provided between the upper layer side portion and the lower layer side portion so that both surfaces of the sheet-like conductive material are in contact with the coating layer. 5. The water shielding structure according to 5. The water-blocking structure according to any one of claims 1 to 6, wherein the coating layer has a water-blocking property. A water leakage detection method for detecting water leakage of the water shielding structure according to any one of claims 1 to 7,
While passing a current through the upper electrode, a current is passed through the lower electrode by passing a current through the first conductive layer through the second conductive layer and the conduction part,
A leak detection method, comprising: detecting a leak of the water shielding layer by measuring a current flowing between the upper electrode and the lower electrode. The water leakage detection method according to claim 8, wherein a current is passed from the ground outside the water shielding portion to the second conductive layer.

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