JP2000093915A - Method for stopping water leakage of impervious layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely repair a leakage part in an impervious layer. SOLUTION: An impervious layer 4 provided with an electrode wire 6a for leakage location detection in an interior and a protection layer 5 laid on above the impervious layer are provided and an injection-material injecting tube 13 is embedded in a leakage part H of the impervious layer 4 by penetrating the protection layer, and the injection-material injecting tube 13 and the electrode wire 6a are connected with each other with a direct current source setting the injection-material injecting tube 13 to a negative side, and then a cement paste obtained by adding a negative ion imparting agent to a cement is injected through the injection-material injecting tube 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the repair of a breakage of a water-impervious layer such as a water-impervious sheet laid on an exposed surface thereof at a final waste disposal site, a contaminated soil disposal site, or a building roof, etc. On the method of construction.

[0002]

2. Description of the Related Art In recent years,
Contamination of groundwater and rivers due to leachate caused by breakage of the seepage control sheet, which is often used at final disposal sites that contain waste and contaminated soil, etc., has been raised as a serious social problem, and as a result, leakage of seepage control sheet has been raised. Detection systems and sheet repair methods are being developed. As a method of detecting this break point, a wire (electrode) is placed inside the sheet or above and below the sheet, taking advantage of the property that the water-blocking sheet is insulative.
Are arranged in a grid pattern, and once a hole is made in the sheet, the electrical characteristics of that portion change due to the water leakage, so that the position of the water leakage can be detected.

[0003] As a method for repairing a sheet, when the waste landfill layer is shallow, it is relatively easy to repair the sheet at the damaged portion by bonding or heat fusion by removing the landfill layer. If it is deep, direct repair is difficult. For this reason, the injection method of a water-stopping material is generally used, but it is difficult to achieve perfect water-stopping only by injecting around the sheet. In particular, the above-described electric leak detection system is used. In this case, it is difficult to secure the electrical insulation of the sheet.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method for repairing a water leakage of a water impermeable layer, which can surely repair a water leakage point of the water impermeable layer.

[0005]

For this purpose, the method for repairing water leakage of the impermeable layer according to the present invention uses an electrode wire 6 for detecting the position of water leakage inside.
a, a protective layer 5 laid on the upper part of the water-impervious layer, and an injection material injection pipe 13 penetrating the protective layer 5 at a leak point of the water-impervious layer 4. The injection material injection tube 1 is embedded so that the injection material injection tube 13 is on the minus side.
3 and the electrode wires 6a and 6b are connected by a DC power supply 14, and a cement paste obtained by adding a negative ion-imparting agent to cement is injected from the injection material injection pipe 13. It should be noted that the numbers added to the above configuration are compared with the drawings to facilitate understanding of the present invention, and the present invention is not limited thereto.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of a method for repairing water leakage of a seepage control layer according to the present invention. FIG. 1 (A) is a schematic cross-sectional view of a final disposal site, and FIG. 1 (B) is the seepage control method of FIG. 1 (A). It is an exploded perspective view of a sheet.

In FIG. 1A, a secondary impermeable layer 3 is laid on the bottom surface of a base 2 of a disposal site 1 for containing waste, contaminated soil, etc. 4 is laid, and a protective layer 5 is laid on the impermeable sheet 4.
As a material of the protective layer 5, a nonwoven fabric is preferable. FIG.
As shown in (B), the water-blocking sheet 4 has a three-layer structure in which a reinforcing fiber layer 4c and a pair of electrode wires 6a, 6b are sandwiched between upper and lower insulating sheets 4a, 4b. .

FIG. 2 is a view for explaining a method for detecting the position of water leakage of the impermeable sheet of FIG. As shown in FIG. 2A, a pair of electrode wires 6a and 6 described in FIG.
b, a large number of sets thereof are arranged in parallel, and adjacent electrode lines 6a and 6b are connected to every other wire 7 and 8, respectively, and a leakage current detector 9 is connected to the wires 7 and 8.
The leak current detector 9 detects whether current flows through one connection line and whether the other connection line is energized. If there is no damage to the impermeable sheet 4, the leak current detector 5 detects the current. do not do.

As shown in FIG. 2A, when the impermeable sheet 4 is damaged, the leachate accumulated in the disposal site penetrates through the damaged portion H into the inner fiber layer 4c, and eventually adjoins the adjacent fiber layer 4c. When the current spreads to one electrode wire by the leak current detector 9, the current flows to the other electrode wire, which is detected by the leak current detector 9. It can be detected that there is water leakage somewhere on the water sheet 4.

When it is detected that there is water leakage somewhere on the water-blocking sheet 4, the line at the water leakage position is specified next. As shown in FIG. 2B, adjacent electrode lines 6a, 6a
The leakage current detector 9 checks whether or not the power is supplied to each set of b, and specifies the leaked line 10.
When the leaked line 10 is specified, as shown in FIG. 2C, an oscilloscope 11 is connected to the specified line 10, a pulse is generated on one electrode line 6a, and the line returns to the other electrode line 6b. The leak location is detected by the response waveform 12 (pulse value). Since a large waveform is obtained at the leak location H, the oscilloscope 11 can determine the leak location on the order of several centimeters.

[0011] When the leak location is specified in this way,
As shown in FIG. 1 (A), the injection material injection pipe 13 penetrates the landfill layer U and the protective layer 5 and is embedded to the position of the water leakage sheet 4, and the water injection sheet 4 is positioned so that the injection material injection pipe 13 is on the minus side. Are connected by a DC power supply 14 between the electrode wires 6a and 6b. As a method of penetrating the buried layer U and the protective layer 5,
For example, a blade may be attached to the tip of the injection material injection pipe 13 and the injection material injection pipe 13 may be rotated.

FIG. 3 is an enlarged sectional view of FIG. 1 showing one embodiment of the method for repairing water leakage of the impermeable layer of the present invention. In FIG. 3, the injection material injection pipe 13 penetrates the landfill layer U and the protective layer 5 and is embedded to the position of the water leaking point H of the water leak sheet 4.
The state where the injection material is injected from the injection material injection pipe 13 is shown. The injection material is a cement paste obtained by adding a water reducing agent used in the civil engineering field or a surfactant used in the cleaning field, or a negative ion-imparting agent such as activated carbon to ultrafine cement or ordinary cement. The surrounding area is provided with negative ions.

Therefore, when the cement paste is injected from the injection material injection tube 13 using the injection material injection tube 13 as a negative electrode and the electrode wire 6a as a positive electrode, the negatively ionized cement particles C push the protective layer 5 upward. It flows in the direction of the positive electrode wire 6a, so that the periphery of the damaged portion H can be completely filled with the cement pace, and the water leaking portion H of the water impermeable sheet 4 can be surely repaired. Further, when the space between the injection material injection pipe 13 and the electrode wire 6a is filled with the negatively ionized cement particles C, the continuity between the two can be detected by the ammeter 15 in FIG. It is possible to determine whether or not the part has been repaired.

The material of the protective layer 5 is preferably a non-woven fabric, but is not limited thereto.
3 may be used as long as the material allows the penetration of cement particles 3 and does not allow the cement particles to pass through the landfill layer. For example, as shown in FIG. 4, a layer 5b having a loofah structure is formed on the lower surface of a resin sheet 5a made of vinyl or the like.
May be integrated, and the flow of the cement paste may be ensured by the layer 5b.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above-described embodiment, the invention is applied to the water leakage sheet of the disposal site, but is not limited to the water leakage sheet, and can be applied to a water barrier layer such as asphalt. It is also applicable to water leakage repair.

[0016]

As is apparent from the above description, according to the present invention, by imparting fluidity to the cement paste, it is possible to reliably repair the water leaking portion of the impermeable layer.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for repairing water leakage of a seepage control layer according to the present invention. FIG. 1 (A) is a schematic sectional view of a final disposal site, and FIG.
(B) is an exploded perspective view of the waterproof sheet of FIG. 1 (A).

FIG. 2 is a diagram for explaining a method of detecting a water leakage position of the water impermeable sheet of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of FIG. 1, showing one embodiment of the method for repairing water leakage of the impermeable layer of the present invention.

FIG. 4 is a view showing a modification of the protective layer according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Waterproof sheet 5 ... Protective layer 6a, 6b ... Electrode wire 13 ... Injection material injection pipe 14 ... DC power supply H ... Water leakage point

Claims (3)

[Claims] 1. A water-impervious layer having an electrode wire for detecting a water-leakage position therein, and a protective layer laid on the water-impervious layer.
An injection material injection pipe is buried in the water leaking portion of the impermeable layer through the protective layer, and the injection material injection pipe and the electrode wire are connected with a DC power supply such that the injection material injection pipe is on the minus side, A method for repairing water leakage of a water-blocking layer, comprising injecting a cement paste obtained by adding a negative ion-imparting agent to cement from an injection material injection pipe. 2. The method according to claim 1, wherein said protective layer is formed by integrating a layer having a loofah structure on a lower surface of a resin sheet. 3. The method according to claim 1, wherein the state of repair is determined by detecting conduction between the injection material injection pipe and the electrode wire.