JP3134047B2 - Laying structure of waterproof sheet and its protection member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used to prevent the surrounding environment from being polluted by contaminated water oozing from waste landfilled in a waste disposal site, or to prevent water leakage from a reservoir or embankment. TECHNICAL FIELD The present invention relates to a water-impervious sheet laid to prevent such a phenomenon and a laying structure of a protective member therefor.

[0002]

2. Description of the Related Art For example, at a waste disposal site that disposes of industrial waste and general waste by incineration and other waste by landfill, the surrounding water is contaminated by contaminated water that seeps out of the waste landfilled at the waste disposal site. In order to prevent the environment from being polluted, the waste disposal site is to be impermeable. Conventionally, from the viewpoint of workability, economy, reliability, safety, etc., this water-blocking work has conventionally been applied to waste disposal sites by using water-blocking sheets made of synthetic resin such as polyethylene, polyvinyl chloride, polypropylene, or rubber. A water-blocking structure in which a water-blocking sheet is laid is widely used.

[0003] In the case of a water-blocking structure in which a water-blocking sheet is laid at a waste disposal site, the water-blocking sheet may be damaged due to a failure at the joint portion of the water-blocking sheet, or due to improper installation of the water-blocking sheet. May be. If the waste is landfilled without repairing the defective or damaged joints, the contaminated water will leak from the defective or damaged joints and contaminate the surrounding environment. It is necessary to quickly detect the presence or absence of a defective joint or a damaged part, and to appropriately repair the detected defective joint or the damaged part.

[0004]

However, as compared with the detection of a defective joint, which is only required to inspect a limited portion such as a joint portion of a waterproof sheet, the detection of a damaged portion is performed over the entire surface of the laid waterproof sheet. Since it has to be performed over a long period of time, there has been a demand for providing a method for efficiently detecting the damaged portion. As a method for detecting breakage of the impermeable sheet after landfilling waste, conventionally, a pair of electrodes is disposed below the impermeable sheet, and water leakage, In other words, a number of methods have been proposed for detecting a damaged portion of the impermeable sheet. However, in order to use this detection method with the impermeable sheet laid (before landfilling waste), the installed impermeable sheet must be used. Water must be sprinkled over the entire surface of the water sheet, which hinders subsequent work, and it is difficult to detect a fine breakage (for example, a pinhole having a diameter of 1 mm or less) by this detection method. There was a problem that. If it is not necessary to detect damage to the impermeable sheet after landfilling waste, etc., it is not possible to use the impermeable sheet damage detection method that is installed in pairs below the impermeable sheet. Also, there is a problem that the construction cost is increased.

[0005] The present invention solves the above-mentioned problems, and enables the water-impervious sheet to be efficiently cut, including finely broken spots.
Another object of the present invention is to provide a water-impervious sheet that can be detected at a low cost and a laying structure of a protective member therefor.

[0006]

In order to achieve the above-mentioned object, according to the present invention, there is provided a water-impervious sheet and a laying structure of the protective member provided between the water-impervious sheet and the ground. In the laying structure of the water-impervious sheet and its protective member, the water-impervious sheet and the protective member are laid between the water-impervious sheet and the ground. In the laying structure, a nonwoven fabric made of synthetic fiber is used
Conductive powder such as carbon powder and iron powder on the upper surface of the protective member.
Apply conductive paint containing or conductive such as aluminum
To form a metal coating with a coating by evaporation or plating
By forming a conductive layer, characterized in that the contact surface with at least water shield sheet has to have a conductivity.

The laying structure of the waterproofing sheet and the protective member therefor according to the present invention provides the surface of the protective member that contacts the waterproofing sheet with conductivity, and the contacting surface of the protective member with the waterproofing sheet (hereinafter, referred to as the contacting surface).
It may be referred to as a “conductive surface”. 2) Connect the cathode of the high voltage (low current) generator to the appropriate location, and move the anode lightly along the surface of the impermeable sheet so that the anode and the conductive surface A spark is generated due to a short circuit between them, and the worker can detect the spark directly or by a control device of a high voltage (low current) generating device to detect a damaged portion.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of an embodiment of the present invention. 1 to 4 show an embodiment of a water-impervious sheet and a protective member laying structure of the present invention.

The laying structure shown in FIG. 1 firstly prevents the impermeable sheet 1 from being damaged by touching the ground 10.
A protection member 2 made of a nonwoven fabric is laid on a ground 10, and a water-impervious sheet 1 is laid on the protection member 2. In this case, a sheet made of a synthetic resin such as polyethylene, polyvinyl chloride, and polypropylene, or a sheet made of rubber, which is conventionally used, can be used as the water-blocking sheet 1. The protective member 2 is preferably made of a nonwoven fabric made of synthetic fiber having corrosion resistance. The conductive layer 3 is formed on the upper surface of the protective member 2, that is, the contact surface with the impermeable sheet 1. Have been. The conductive layer 3 is formed by applying a conductive paint containing a conductive powder such as carbon powder and iron powder on the upper surface of the protective member 2, depositing a conductive metal coating such as aluminum, or the like. It is formed by plating
It can be formed by Rukoto.

Next, in the laying structure shown in FIG. 2 , a protective member 5 made of a synthetic resin net member is provided on the ground 10 in order to prevent the waterproof sheet 1 from touching the ground 10 and being damaged. Further, a protective member 2 made of a nonwoven fabric is laid thereon, and a water-impervious sheet 1 is laid on the protective member 2. In this case, the water-impervious sheet 1 and the protective member 2 are the same as those shown in FIG. 1, that is, the water-impervious sheet 1 is a synthetic resin sheet or a rubber sheet. For example, a nonwoven fabric made of synthetic fibers having a conductive layer 3 formed on the upper surface thereof can be used. Further, as the protective member 5, it is preferable to use a net member made of a synthetic resin such as polyethylene, polyvinyl chloride, and polypropylene.

Next, in the laying structure shown in FIG. 3 , first, a water-impervious sheet 6 is laid on the ground 10, and the water-impervious sheet 1 is placed thereon to prevent the water-impervious sheet 1 from touching the ground 10 and being damaged. ,
A protection member 5 made of a synthetic resin net member is further laid thereon, and a protection member 2 made of a nonwoven fabric is laid thereon. On this protection member 2, a waterproof sheet 1 is laid.
In this case, the water shielding sheet 1, the protection member 2 and the protection member 5 are the same as those shown in FIG.
The water-blocking sheet 1 is a synthetic resin sheet or a rubber sheet, the protective member 2 is a synthetic fiber non-woven fabric or the like having a conductive layer 3 formed on the upper surface thereof, and the protective member 5 is a synthetic fiber non-woven fabric. A resin net member can be used. As the water-blocking sheet 1, a sheet made of a synthetic resin such as polyethylene, polyvinyl chloride, and polypropylene, or a sheet made of rubber, which is conventionally used, can be used.

The laying structure of the water-impervious sheet and its protective member according to the present invention comprises a protective member directly below the water-impervious sheet 1 in which at least the contact surface with the water-impervious sheet 1 has conductivity. What is necessary is just to use a member, and it is not limited to the laying structure shown in FIGS .

FIG. 1 shows a method for detecting a damaged portion of a water-impervious sheet according to the present invention.
The laying structure shown in FIG. As shown in FIG.
An appropriate portion of the conductive layer 3 formed on the upper surface of the protection member 2 is brought into contact with a cathode 7b connected to a high-voltage (low-current) generator 7 through a conducting wire 7d. The anode 7a connected to the water-permeable sheet 1 via a conducting wire 7c
Move lightly along the surface. And
If there is a damaged portion in the water-blocking sheet 1, a spark occurs due to a short circuit between the anode 7a and the conductive layer 3 at the damaged portion. And the damaged portion can be detected.

In this case, a high voltage (low current) generator 7 places a few thousand to between the anode 7a and the cathode 7b.
Apply high voltages of tens of thousands of volts, typically 5,000 to 20,000 volts. In addition, the anode 7a and the cathode 7b are preferably made of a flexible material, for example, a rod-shaped member or a plate-shaped member made of a conductive rubber so as not to damage the water shielding sheet 1. Further, the anode 7a has A handle 7e insulated from the anode 7a is provided to improve operability. Also,
The control device 8 is provided with an alarm device and a warning light for detecting that a short circuit has occurred between the anode 7a and the conductive layer 3 and notifying the operator of the short circuit. The high-voltage (low-current) generator 7 and the controller 8 may be either fixed or portable.

[0015] Incidentally, the detection method of the breach of the water barrier sheet is also the case for laying structure shown in FIGS. 2-3.

[0016]

According to the waterproofing sheet and the protective member laying structure of the present invention, the cathode of the high voltage (low current) generator is connected to an appropriate portion of the conductive surface of the protective member, and the anode is connected to the waterproofing sheet. By touching along the surface of the sheet so as to lightly touch it, a damaged portion can be detected, so that a damaged portion of the water-impervious sheet can be efficiently detected including a finely damaged portion. In particular, the waterproofing sheet of the present invention and the laying structure of the protective member include a nonwoven fabric made of synthetic fiber for the protective member.
Use a conductive material such as carbon powder or iron powder on the upper surface of this protective member.
Apply conductive paint containing conductive powder or aluminum
Conductive metal coatings such as N for deposition and plating
Since the conductive layer is formed by forming the conductive member and the protective member is made to have conductivity, the conductive surface of the protective member can be formed by a method according to the material of the protective member and the like. In addition to being able to efficiently detect a damaged portion of the water sheet, the water shielding work can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a laying structure of a water-impervious sheet and a protective member thereof according to the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a laying structure of a water-impervious sheet and a protective member thereof according to the present invention.

FIG. 3 is a longitudinal sectional view showing an example of a laying structure of a water-impervious sheet and its protective member according to the present invention.

FIG. 4 is an explanatory diagram of a method for detecting a damaged portion of the water impermeable sheet by the laying structure of the water impermeable sheet and its protective member of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Protective member 3 Conductive layer 4 Protective member 5 Protective member 6 Waterproof sheet 7 High voltage (low current) generator 7a Anode 7b Cathode 8 Control device 10 Ground

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-229530 (JP, A) JP-A-6-307969 (JP, A) JP-A-60-133150 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) G01M 3/40 G01M 3/16

Claims (1)

(57) [Claims] 1. A waterproofing sheet in which a protective member separate from the waterproofing sheet is laid between the waterproofing sheet and the ground, and a laying structure of the protective member, wherein the protecting member immediately below the waterproofing sheet is provided. Using a synthetic fiber non-woven fabric for the protective member
Containing conductive powder such as carbon powder and iron powder on the upper surface
Apply conductive paint or have conductivity such as aluminum
Conducted by forming a metal coating by evaporation or plating
Water shield sheets and laying structure of the protective member to form a conductive layer, characterized in that the contact surface with at least water shield sheet has to have a conductivity.