JPH09327675A - Water shielding structure for waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease absolute amt. of leaking contaminated water and to prevent contamination of surrounding environment even when a water shielding sheet is damaged by arranging a synthetic resin face-like member having continuous gaps by forming unevenness on its surface between the water shielding sheets. SOLUTION: A water shielding layer 1 is laid on the whole face of the ground of a waste disposal site. This water shielding layer 1 is prepd. by arranging a synthetic resin face-like member IC e.g. made of high density polyethylene with continuous gaps prepd. by laminating corrosion-resistant nonwoven fabrics 1b and 1e between water shielding sheets 1a and 1d such as sheets made of a synthetic resin, e.g. polyethylene and forming unevenness on the surface. By making it like this, even when the water shielding sheets 1a and 1d are damaged, contaminated water is rapidly discharged through a synthetic resin face-like member arranged between the water shielding sheets 1a and 1d to decrease remarkably the absolute amt. of leaking contaminated water to the surrounding ground from the damaged position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention lays a water-blocking sheet at a waste disposal site to prevent the surrounding environment from being contaminated by contaminated water leaking from the waste landfilled at the waste disposal site. It is related to the impermeable structure.

[0002]

2. Description of the Related Art Conventionally, in a waste disposal site that disposes of incineration residues of industrial waste and general waste and other waste by landfill, contaminated water leaking from the waste landfilled in the waste disposal site causes the surrounding area to become contaminated. To prevent pollution of the environment
The waste disposal site will 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.

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 by the weight of the landfilled waste itself or a sharp object contained in the landfilled waste. May receive it. If the impermeable sheet is damaged, the contaminated water leaks from the damaged area and contaminates the surrounding environment. Appropriate repairs need to be made to the location, and many detection methods and repair methods have been proposed for this purpose.

[0004]

However, even with these methods, it takes a certain amount of time to complete the repair of the damaged portion of the impermeable sheet, so that the contamination of the surrounding environment due to the leakage of contaminated water is completely prevented. Could not be prevented.

The present invention solves the problems of the above-mentioned waste disposal site and reduces the absolute amount of contaminated water leaking from the damaged part when the water-blocking sheet is damaged, thereby reducing the surrounding water. The purpose is to provide a water-impervious structure for a waste disposal site that can prevent environmental pollution.

[0006]

In order to achieve the above-mentioned object, the water-impervious structure of the waste disposal site of the present invention forms irregularities on the surface between the water-impermeable sheets laid on the waste disposal site. By so doing, a synthetic resin sheet-like member having continuous voids is arranged.

As a result, when the water-blocking sheet is damaged, the contaminated water leaking from the damaged portion is promptly discharged through the synthetic resin sheet member arranged between the water-blocking sheets to prevent damage. The absolute amount of contaminated water leaking from the location to the surrounding ground can be significantly reduced.

In this case, a band-shaped synthetic resin sheet member having continuous voids is formed at a predetermined interval in the vicinity of the water blocking sheet laid on the slope of the waste disposal site by forming irregularities on the surface. It can be installed separately.

As a result, the gas generated from the landfilled waste or the ground of the waste disposal site is discharged through the belt-shaped synthetic resin sheet member arranged in the vicinity of the water-blocking sheet, and the water-blocking sheet. The pressure of the waste gas or the gas generated from the ground can be reduced to prevent the water-impervious sheet from being damaged.

Further, a large number of irregularities are formed on the surface of the synthetic resin sheet member disposed between the water shield sheets and the synthetic resin sheet member disposed in the vicinity of the water shield sheet laid on the slope. It is possible to use a synthetic resin planar member having a surface coated with a non-woven fabric filter.

This prevents dirt and waste from entering the voids of the synthetic resin sheet-like member and maintains the water permeability or air permeability of the synthetic resin sheet-like member satisfactorily for a long period of time. can do.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the water blocking structure of a waste disposal site of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the ground 10 of the waste disposal site to which the present invention is applied makes it easy to reclaim and dispose of waste, such as bottom 10a, slope lower step 10b, slope small step 10c, slope upper step 10d and It has the shape of a mortar composed of the slope top 10e, and the water-impervious layer 1 is laid on the entire surface of the ground 10. On the slope small step portion 10c and the slope top end portion 10e, band-like concrete is cast to form the fixing portions 2a and 2b of the water shield layer 1. On top of the impermeable layer 1 laid on the bottom 10a of the ground 10, a crushed stone layer 4a having water permeability and a soil covering layer 4b such as sand are formed in order from the top, and the impermeable layer 1 is placed at an appropriate position. A synthetic resin drain pipe 3 having a pressure resistant structure having a large number of through holes on the surface is disposed in the crushed stone layer 4a formed on the hollow, and the contaminated water is discharged to the outside of the waste disposal site. To do.

The layer structure of the water-impervious layer 1 has a bottom portion 10 of the ground 10.
a, slope lower step 10b, slope small step 10c, slope upper step 10d, slope top 10e, etc., which can be changed according to their positions. In this example, the following layer structure is used. Has been adopted. (a) In the bottom portion 10a, the water-blocking sheet 1 in order from the top.
a, a non-woven fabric 1b, a synthetic resin sheet member 1c having continuous voids by forming irregularities on the surface, a water-blocking sheet 1d, and a non-woven fabric 1e (see FIG. 2).
(A)). (b) In the lower slope portion 10b, in order from the top, a water-blocking sheet 1f, a nonwoven fabric 1g, a synthetic resin planar member 1h having continuous voids by forming irregularities on the surface, a water-blocking sheet 1i, and a nonwoven fabric. 1j has a 5-layer structure (Fig. 2).
(B)). (c) In the sloped step portion 10c, the fixing portion 2 of the impermeable layer 1
With a as the boundary, the lower side is in order from the top, the waterproof sheet 1
f, a non-woven fabric 1g, a synthetic resin planar member 1h having continuous voids by forming irregularities on the surface, a water impervious sheet 1i, and a non-woven fabric 1j having a five-layer structure, and the upper side is a water impervious sheet in order from the top. 1 m, non-woven fabric 1 n, water-impervious sheet 1 p and non-woven fabric 1 q have a four-layer structure.
The anchor sheet 1k arranged in the fixing portion 2a is joined by heat fusion or the like (FIG. 2 (b)). (d) In the upper slope portion 10d, in order from the top, the water-blocking sheet 1m, the nonwoven fabric 1n, the water-blocking sheet 1p, and the nonwoven fabric 1q.
It has a four-layer structure. (e) At the top 10e of the slope, the fixing portion 2 of the water-impervious layer 1
The water impervious sheet 1 in order from the top to the bottom, with b as the boundary.
m, non-woven fabric 1n, water impervious sheet 1p, and non-woven fabric 1q, which have a four-layer structure, and the lower part of the impermeable sheet 1 in the fixing portion 2b.
m is joined to the anchor sheet 1r arranged in the fixing portion 2b by heat fusion or the like (FIG. 2 (d)).

In this case, the impermeable sheets 1a, 1
For d, 1f, 1i, 1m, and 1p, conventionally used synthetic resin sheets such as polyethylene, polyvinyl chloride, polypropylene, etc., or rubber sheets can be used. In addition, non-woven fabrics 1b, 1e, 1g, 1j, 1n, 1q
Is to prevent the water-impervious sheets 1a, 1d, 1f, 1i, 1m, 1p from being damaged. For this, a non-woven fabric made of synthetic fiber such as polypropylene having corrosion resistance should be used. it can. In addition, the synthetic resin planar member 1c,
1h is when the water blocking sheets 1a and 1f are damaged,
It is arranged to quickly discharge the contaminated water leaking from the damaged place to the outside of the waste disposal site. For example, as shown in FIG. 3, a synthetic material such as high density polyethylene having a large number of irregularities formed on its surface is used. resin planar member 1c ₁ surface and a non-woven filter 1c ₂ such as polypropylene backside, 1c ₃ in coated surface drainage material Ya (Takiron Co. planar drainage material (trade name "Gris sheets")) It is possible to use a net member made of synthetic resin such as high-density polyethylene (Net material manufactured by Takiron Co., Ltd. (trade name "Trical Net") with irregularities formed on the surface, but particularly large amounts of contaminated water leak out. The synthetic resin sheet member 1c used for the bottom portion 10a of the soil 10 that is likely to be exposed uses a sheet drainage material having high water permeability as shown in FIG. 10's It is desirable to use an inexpensive synthetic resin net member for the synthetic resin planar member 1h used for the slope lower step portion 10b. The surface drainage material is composed of a single synthetic resin sheet member 1c ₁ such as high-density polyethylene having a large number of irregularities formed on the surface, or only the surface of the synthetic resin sheet member 1c ₁ . It is also possible to use a filter formed by coating a non-woven fabric filter 1c ₂ such as polypropylene. In addition, in order to discharge the contaminated water leaking from the damaged portion to the outside of the waste disposal site when the water blocking sheets 1a and 1f are damaged at appropriate positions of the synthetic resin planar members 1c and 1h. Contaminated water drainage equipment (not shown) will be installed. The contaminated water drainage facility can be shared with the contaminated water drainage facility (not shown) of the synthetic resin drainage pipe 3 arranged in the crushed stone layer 4a formed on the water shield layer 1. Further, as the anchor sheets 1k and 1r, a synthetic resin sheet such as polyethylene or polypropylene having a large number of anchor pieces formed on the lower surface is used so that the anchor sheets 1k and 1r can be firmly fixed to the fixing portions 2a and 2b. be able to. In addition, in the above-mentioned embodiment, the layer structure of the water-impervious layer 1 of the upper slope 10d is, in order from the top, the water-impervious sheet 1m, the non-woven fabric 1n, the water-impervious sheet 1p and the non-woven fabric 1q.
In the case of this type of mortar-shaped waste disposal site, the quality of the water becomes higher toward the top, and if the water-blocking sheet is damaged, it leaks from the damaged part. Since the amount of water itself is also small, the water-blocking sheet 1p and the non-woven fabric 1q are used as the layer structure of the water-blocking layer 1 of the upper slope 10d.
It is also possible to adopt a two-layer structure in which the water-impermeable sheet 1m and the non-woven fabric 1n are omitted.

Lower slope 10 of the ground 10 of the waste disposal site
b, In the vicinity of the impermeable layer 1 laid on the sloped small steps 10c and the sloped upper steps 10d, discharge the gas generated from the landfilled waste or the ground 10 of the waste disposal site into the atmosphere. 4 and 5, the belt-shaped synthetic resin planar members 6a and 6b having continuous voids are formed at predetermined intervals by forming irregularities on the surface, as shown in FIGS. Of these, the synthetic resin planar member 6a is, as shown in FIG. 4, close to above the water-impervious layer 1 and on the water-impervious layer 1 whose lower end is laid on the bottom portion 10a of the ground 10. The crushed stone layer 4a thus formed is arranged such that the upper ends thereof are located in the atmosphere.
The gas generated from the landfilled waste can be released into the atmosphere via the. On the other hand, as shown in FIG. 5, the synthetic resin planar member 6b is formed near the lower part of the water shield layer 1 and below the water shield layer 1 laid at the lower end on the bottom portion 10a of the ground 10. In the crushed stone layer 5b of the groundwater drainage equipment 5, the upper end of the groundwater drainage equipment 5 is disposed in the atmosphere through the discharge pipe 6c, and the waste is discharged through the synthetic resin sheet member 6b and the discharge pipe 6c. The gas generated from the ground 10 of the waste disposal site can be released into the atmosphere.

As described above, by locating the lower end of the synthetic resin sheet member 6a on the crushed stone layer 4a, the gas generated from the waste near the bottom portion 10a of the ground 10 is crushed stone layer 4a and the synthetic resin sheet member. The gas generated from the bottom portion 10a of the ground 10 can be released into the atmosphere through the 6a, while the lower end of the synthetic resin planar member 6b is located in the crushed stone layer 5b of the groundwater drainage facility 5 to crush the rocks generated from the bottom 10a of the ground 10. It can be released into the atmosphere through the layer 5b, the synthetic resin sheet-like member 6b and the release pipe 6c.

In this case, the synthetic resin planar member 6
In a and 6b, for example, as shown in FIG. 3, the front and back surfaces of a synthetic resin planar member 1c ₁ such as a high density polyethylene having a large number of irregularities formed on its surface are non-woven fabric filters 1c ₂ and 1c such as polypropylene. _The sheet-shaped drainage material coated with ₃ (sheet-shaped drainage material manufactured by Takiron Co., Ltd. (trade name "green sheet") can be diverted. The surface drainage material is composed of a single synthetic resin sheet member 1c ₁ such as high-density polyethylene having a large number of irregularities formed on the surface, or only the surface of the synthetic resin sheet member 1c ₁ . It is also possible to use a filter formed by coating a non-woven fabric filter 1c ₂ such as polypropylene. Also, groundwater drainage equipment 5
Is formed below the water-impervious layer 1 laid on the bottom 10a of the ground 10, and has a cover layer 5a of sand or the like, a water-permeable crushed stone layer 5b formed below the cover layer 5a, and a crushed stone layer 5b. It is composed of a synthetic resin drain pipe 5c having a pressure resistant structure having a large number of through holes on its surface, and is capable of discharging excess groundwater in the ground 10 to the outside of a waste disposal site. Is.

[0018]

According to the impermeable structure of the waste disposal site of the present invention, when the impermeable sheet is damaged, the contaminated water leaking from the damaged part is disposed between the impermeable sheets. The absolute amount of contaminated water that leaks from the damaged area to the surrounding ground can be significantly reduced by promptly discharging it through the resin surface member, which prevents pollution of the surrounding environment due to leakage of contaminated water. can do.

Further, by arranging a strip-shaped synthetic resin sheet member having continuous voids by forming irregularities on the surface in the vicinity of the water-blocking sheet laid on the slope of the waste disposal site, The gas generated from the landfilled waste or the ground of the waste disposal site is discharged through the belt-shaped synthetic resin surface member that is arranged near the water-impervious sheet, and the waste or ground that impinges on the water-impermeable sheet. The pressure of the gas generated from the water can be reduced to prevent the waterproof sheet from being damaged.

Further, a large number of irregularities are formed on the surface of the synthetic resin planar member disposed between the water blocking sheets and the synthetic resin planar member disposed near the water blocking sheet laid on the slope. By using a synthetic resin surface member formed by covering the surface of the synthetic resin surface member with a non-woven filter, it is possible to prevent dirt and waste from entering the voids of the synthetic resin surface member,
The water permeability or air permeability of the synthetic resin planar member can be favorably maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a water-impervious structure of a waste disposal site of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1, where (a) is a portion A of FIG.
1B is a portion B of FIG. 1, FIG. 1C is a portion C of FIG. 1, and FIG.
Shows parts D in FIG. 1, respectively.

FIG. 3 shows an example of a synthetic resin planar member, (a) is a plan view in which a part of a non-woven fabric filter is cut away, and (b) is (a).
FIG. 7 is a sectional view taken along line EE of FIG.

FIG. 4 shows an example of a water blocking structure of a waste disposal site of the present invention, (a) is a vertical sectional view, (b) is a front view, and (c) is a sectional view taken along line FF of (a). is there.

FIG. 5 shows an example of a water blocking structure of a waste disposal site of the present invention, (a) is a vertical sectional view, (b) is a front view, and (c) is a sectional view taken along the line GG of (a). is there.

[Explanation of symbols]

1 Water-impermeable layer 1a, 1d, 1f, 1i, 1m, 1p Water-impermeable sheet 1b, 1e, 1g, 1j, 1n, 1q Non-woven fabric 1c, 1h Synthetic resin planar member 1c ₁ Synthetic resin planar member 1c ₂ Non-woven fabric Filter 1c ₃ Non-woven fabric filter 1k, 1r Anchor sheet 2a, 2b Fixing part 6a, 6b Synthetic resin surface member 10 Ground 10a Bottom part 10b Slope lower step 10c Slope small step 10d Slope upper step 10e Slope top

Claims (3)

[Claims] 1. A waste characterized in that a synthetic resin planar member having continuous voids is formed by forming irregularities on the surface between the water-blocking sheets laid one on top of another at a waste disposal site. Impermeable structure of landfill. 2. A belt-shaped synthetic resin sheet member having continuous voids formed by forming irregularities on the surface in the vicinity of a water-blocking sheet laid on the slope of a waste disposal site at a predetermined interval. The water-impervious structure of a waste disposal site according to claim 1, which is provided. 3. The synthetic resin planar member is a synthetic resin planar member having a large number of irregularities formed on the surface thereof, and the surface is covered with a non-woven fabric filter.
Or the water-impervious structure described in 2.