JPH07195596A - Water-barrier sheet - Google Patents

Abstract

PURPOSE:To manufacture a water-barrier sheet of superior ensuring effect to a water-barrier main body which can prevent the infiltration of water leakage into under the ground, even if the water-barrier main body is damaged, and in which whether the water-barrier sheet is damaged or not can be seused easily and surely and the work of spread of the sheet is simply carried out. CONSTITUTION:In a water-barrier sheet 1, an unpermeable sheet 4 is interposed between an unpermeable water-barrier sheet main body 2 and a water-permeable protection sheet 3 in a manner of forming a communicating space 5 between the unpermeable sheet and the water-barrier sheet main body 2, and the communicating space 5 works as a water introduction line when the water-barrier sheet main body 2 is damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-blocking sheet which is laid at the bottom of a landfill, a pond, etc. to block water from penetrating into the ground from the landfill, pond, etc. .

[0002]

2. Description of the Related Art Conventionally, from the viewpoint of environmental protection, in a landfill of waste, from the viewpoint of environmental protection, dirty leachate such as rainwater that passes through the landfill waste layer penetrates into the ground. To prevent this, a water impervious sheet is laid on the bottom.

In this case, in order to confirm whether or not the water-impervious performance of the water-impermeable sheet is impaired, the landfill site is divided into a plurality of sections, and different water-impervious sheets are laid on each of the sections and collected at the bottom of each. It is desirable to use a water pipe to have a water-impervious structure in which leachate is discharged from the water collection pipe in the unlikely event that the water-impervious sheet is torn.

The present invention has been made in order to meet the above-mentioned demands, and an object of the present invention is to provide a water-impervious sheet which can be used as a damage-detecting water-impervious structure by a simple operation.

[0005]

In order to achieve the above object, the present invention provides a water-impermeable sheet between the water-permeable impermeable sheet main body and the water-permeable protective sheet as the water-impermeable sheet main body. Provided is a water-impervious sheet, characterized in that it has a communication void therebetween and is integrated, and the communication void serves as a water conduit when the main body of the water-impermeable sheet is damaged.

In this case, it is recommended that the water-permeable channel-forming impermeable sheet is partially bonded to the water-impermeable sheet main body and the protective sheet, respectively.

[0007]

The water-impermeable sheet of the present invention is disposed at the bottom of a hole dug in soil such as a landfill or a pond, with the water-shielding sheet main body as the front side and the protective sheet as the back side, whereby the landfill site, etc. The water is prevented from being blocked by the above-mentioned water-blocking sheet and penetrating into the ground.

In this case, if the main body of the waterproof sheet is damaged,
Water from the landfill site flows through the damaged part of the water shield sheet and into the communication gap (headrace) formed between the water shield sheet and the impermeable sheet. Since it is a water-permeable sheet, it is blocked by a water-impermeable sheet to prevent it from penetrating into the ground, and if a water collection pipe is connected to this (headrace), water will flow through this water collection pipe. It is possible to detect the occurrence of damage to the water-blocking sheet and to take prompt repairs to the above-mentioned water-blocking sheet.

As described above, the water-impermeable sheet of the present invention has a damage detecting action, but since this water-impermeable sheet is mainly composed of a water-impermeable sheet, a water-impermeable passage-impermeable sheet and a protective sheet, It can be manufactured easily and inexpensively, and because it is integrated, it can be installed easily.

In this case, by partially adhering the water-permeable channel-forming impermeable sheet to the water-shielding sheet main body and the protective sheet,
Even if one of the layers is damaged, the damage does not propagate, and each layer is devised so as to exert an independent function.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a water-permeable sheet according to the present invention. This water-permeable sheet 1 is composed of a water-permeable synthetic resin or rubber impermeable sheet main body 2 and a water-permeable protective sheet 3. A corrugated water-impermeable sheet 4 made of water-impermeable synthetic resin or rubber is integrally interposed, and a communication gap 5 is formed between the water-permeable sheet main body 2 and the water-impermeable sheet. 4 is a water-blocking sheet main body 2 and a protective sheet 3
And partially bonded 6 respectively.

Incidentally, the water-blocking sheet 1 is mainly composed of the water-blocking sheet 2.
For example, polyethylene such as high density polyethylene (HDPA), linear low density polyethylene (LLDPE), low density polyethylene (LDPA), or a synthetic resin sheet such as polypropylene can be used, and its thickness is 0. The range of 5 to 5 mm is preferable.

The material of the water conduit impermeable sheet 4 is ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-propylene-diene terpolymer (EPDM). ) And the like, and the thickness thereof can be in the range of 0.5 to 2 mm.

Further, as the water-permeable protective sheet 3, a foamed material of open cells such as polyethylene, polypropylene, polystyrene, or a non-woven fabric can be used, and its thickness is preferably about 1 to 10 mm.

As shown in FIG. 2, the water-impervious sheet 1 is used for excavating a ground A such as a landfill or a pond as compared with the ground A.
The water-impermeable sheet main body 2 is covered with the protective sheet 3 on the front side, and the protective sheet 3 is stretched on the back side.
The water-permeable impermeable sheet main body 2 is used to prevent the water-permeable impermeable sheet main body 2 from penetrating into the ground A, and the water-permeable protective sheet 3 discharges spring water from the ground.

In this case, if the waterproof sheet main body 2 should be damaged, water leakage will occur from the damaged part. However, the waterproof sheet 1 of the present invention is impermeable to the back surface of the waterproof sheet main body 2. Since the sheet 4 is laminated and the communication gap 5 is formed between the sheet 4 and the water-impervious sheet main body 2, the leaked water flows into the water guide path 5, and the leaked water also forms the water guide path impermeable sheet 4. It is prevented that it is blocked by and penetrates into the ground A. Further, by connecting a water conduit communicating with the outside to the communication void 5 (water conduit), the leaked water is drained to the outside, and a detector for determining whether water is flowing through the water conduit is provided. It is possible to detect whether or not the water-impermeable sheet main body 2 has been damaged by keeping the above. That is, as long as the water-impermeable sheet main body 2 is not damaged, water does not flow into the water conduit 5, and therefore water does not flow to the water conduit. On the other hand, the fact that water flows through the water conduit means that the water-blocking sheet main body 2 has been damaged and water has flowed into the water conduit 5. Therefore, when it is detected that water flows through the water conduit as described above. It is possible to immediately repair damage to the water-blocking sheet main body 2.

Further, in the water-permeable sheet 1, the water-permeable channel-forming impermeable sheet 4, the water-permeable sheet main body 2 and the water-permeable protective sheet 3 are laminated by partial adhesion, so that the water-permeable sheet main body 2 is damaged. Even if the water permeable protective sheet 3 is damaged, it does not propagate directly to the water conduit forming impermeable sheet 4, and the water conduit forming impermeable sheet 4 serves as the secondary water shield sheet main body 2. To fulfill the role of.

The water-blocking sheet 1 as shown in FIG. 1 is easy to lay on the ground A because the water-blocking sheet main body 2, the water conduit forming impermeable sheet 4 and the protective sheet 3 are integrated. It is possible to form the water-impervious structure having the damage detection function as described above simply by stretching the water-impervious sheet 1 so as to cover the ground A.

FIG. 3 shows another embodiment of the present invention.
In this example, a water-permeable sheet 1 as shown in FIG. 1 is further laminated with a water-permeable sheet 7 such as a non-woven fabric on the surface of the water-permeable sheet main body 2. It is recommended that it is useful to prevent the propagation of breakage by integrally bonding 8 together.

By laminating the water-permeable sheet 7 on the surface of the water-permeable sheet main body 2 in this manner, the water-permeable sheet main body 2 can be protected, and damage to the water-permeable sheet main body 2 due to, for example, sharp corners of dust can be prevented. It can be prevented as much as possible.

The water-blocking sheet of the present invention is not limited to the above embodiment, but can be variously modified within the scope of the present invention.

[0022]

INDUSTRIAL APPLICABILITY The water-impermeable sheet of the present invention has an excellent effect of compensating for the water-impermeable sheet main body, so that even if the water-impermeable sheet body is damaged, leakage of water does not penetrate underground, and The presence or absence of damage can be detected easily and reliably, and the tensioning work is simple.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mode of use of the same example.

FIG. 3 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Water-impermeable sheet 2 Mainly water-impermeable sheet 3 Water-permeable protective sheet 4 Water-impermeable sheet 5 Communication void (water passage) 7 Water-permeable sheet

Claims (2)

[Claims] 1. A water-impermeable sheet main body and a water-permeable protective sheet are interposed between the water-impermeable sheet main body and the water-permeable sheet main body so as to have a communication space between them. A water impervious sheet, characterized in that the void is used as a water conduit when the main body of the impermeable sheet is damaged. 2. The waterproof sheet according to claim 1, wherein the water-permeable channel-forming impermeable sheet is partially bonded to the waterproof sheet main body and the protective sheet, respectively.