JP3089875B2 - Protection structure of impermeable sheet at waste disposal site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for protecting a seepage control sheet in a waste disposal site, and more particularly, to protection of a seepage control sheet in a waste disposal site for preventing breakage of a seepage control sheet laid on a slope. Regarding the structure.

[0002]

2. Description of the Related Art In a landfill type waste disposal site for dumping industrial waste and general waste, if sewage leaks from the disposal site and penetrates underground, it may cause environmental pollution.
In order to prevent this, it is obligatory to apply a seepage control to the bottom of the disposal site.

Conventionally, as shown in FIG. 5, for example, as shown in FIG. 5, a soft synthetic resin-based or rubber-based water-impervious sheet 2 having good water-impermeability and excellent workability is used as a waste disposal site. In order to protect the water-impervious sheet 2, a water-impervious structure in which protective soil is laid as a protective mat 3 to protect the water-impervious sheet 2 is adopted.

[0004]

However, in the conventional water-impervious structure using the water-impervious sheet 2 and the protection mat 3, when the water-impervious structure is used, for example, on the flat portion of the bottom surface of the waste disposal site 1, the water impervious structure is required. Even if the waste 4 is thrown upward and deposited, the load of the waste 4 acts on the water-impervious sheet 2 in the vertical direction, so that no force is generated in the direction of pulling the water-impervious sheet 2. When the is used on the inclined surface, the load of the waste 4 also acts in the direction along the inclined surface, and the water-impervious sheet 2 is pulled by the sinking of the waste. 2 was damaged or the water-impervious sheet 2 was sagged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is an object of the present invention to easily prevent breakage of a waterproof sheet laid on an inclined surface due to tensile force caused by input waste. It is an object of the present invention to provide a protection structure of a seepage control sheet in a possible waste disposal site.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above object, and its gist is a protection structure of a seepage control sheet laid on an inclined surface of a waste disposal site, The protection structure covers the surface of the water-impervious sheet and is interposed between the waste and the water-impervious sheet to be put into the disposal site, and performs relative sliding between the waste and the water-impervious sheet. Living
And lubricating member Ru allowed time difference, nonwoven covering the surface of the lubricating member
The present invention provides a structure for protecting a water-impervious sheet in a waste disposal site, comprising a protective mat made of cloth .

In the present invention, it is preferable that the lubricating member is constituted by a water-permeable filter material and a lubricant injected and filled into the filter material.

Further, the present invention provides the lubricating member,
It is also possible to use a fiber material that generates self-lubricating properties by absorbing water.

[0009]

[0010]

According to the protection structure of the present invention having the above-described structure, the impermeable sheet laid on the slope is moved by the weight of the waste input or by the movement of the waste along the slope due to consolidation settlement or the like. Even if a force is generated in the direction of pulling this, the action of the lubricating member interposed between the impermeable sheet and the waste causes relative slip between them to reduce the tensile force, The water-impermeable sheet is easily prevented from being damaged or sagged due to the tensile force. Also, lubricity
Since the surface of the member is further covered with a protective mat,
Deterioration of lubricity of lubricating members due to direct contact with objects
Can be easily prevented.

[0011]

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a protection structure of a seepage control sheet in a waste disposal site 10 according to the present invention.

In FIG. 1, a waste disposal site 10 is formed by excavating in a concave shape using a vast site in a mountainous area, for example. Is laid and the impermeable sheet 12
Is temporarily fixed in a wound state around the concave portion.

The waterproof sheet 12 is made of, for example, a soft synthetic resin-based or rubber-based sheet, and has a lubricating member 14 as a protective structure of the waterproof sheet 12 on its surface.
And a protection mat 16 is laid so as to cover the impermeable sheet 12.

As shown in FIG. 2, the lubricating member 14 has a water-permeable filter sheet 14a in which synthetic resin fibers are entangled to secure a water-permeable gap, and a lubricating member 14 which is provided in the water-permeable gap of the filter sheet 14a. A lubricant 14b made of, for example, bentonite or the like to be impregnated and impregnated.
And this lubricant 14b is, for example, as shown in FIG.
A liquid tank 22 storing an aqueous dispersion of the lubricant 14b is disposed at a predetermined position on the outer periphery of the concave portion of the disposal site 10, and connected to the end of the water-permeable filter sheet 14a by a hose 24 or the like, and is put into the disposal site 10. In accordance with the rise in the height of the deposited waste 20, the required amount is fed into the water-permeable filter sheet 14a by the pump 26, and is filled and injected therein. Further, in this embodiment, the protective mat 16 is formed by laying protective soil on the surface of the lubricating member 14, but other than that, for example, various nonwoven fabrics can be used.

In the waste disposal site 10 where the impermeable sheet 12 having such a protection structure is laid on an inclined surface, breakage and slack of the impermeable sheet 12 on the inclined surface can be easily prevented. That is, even if the tensile force toward the lower part X of the slope is applied to the water-impermeable sheet 12 due to the weight of the waste 20 put into the disposal site 10 or the movement of the waste 20 along the slope due to the consolidation settlement, the lubricating property is improved. Due to the action of the member 14, relative slippage occurs between the water-impervious sheet 12 and the waste 20, thereby relaxing the tensile force and easily preventing breakage or slack of the water-impervious sheet 12 due to the tensile force. be able to. Here, in this embodiment, the permeable filter sheet 14a for securing the permeable gap is formed by entanglement of synthetic resin fibers. It is possible to use a porous mat such as a member or a synthetic resin sheet in which irregularities are provided in a staggered manner and the concaves are made continuous by a water cross section.

Further, in this embodiment, bentonite is used as the lubricant 14b, but rubber asphalt, clay containing bentonite, gelled muddy water and the like can also be used.

FIG. 4 shows a second embodiment of the present invention. A lubricating sheet material 30 made of a fibrous material which generates self-lubricating properties due to water absorption, for example, a non-woven fabric of high water absorbing fiber, is provided on the surface of the water shielding sheet 12. The protective structure of the water impermeable sheet 10 is constructed by further laying protective soil on the upper surface as a protective mat 18. Even with such a protective structure, similarly to the case of the first embodiment, the action of the lubricating sheet material 30 reduces the tensile force applied to the water-blocking sheet 10 and easily prevents breakage of the water-blocking sheet 12 and the like. can do. Further, in this embodiment, since the work of injecting the lubricant is not required, the construction is facilitated.

The superabsorbent fiber nonwoven fabric constituting the lubricating sheet material 30 is, for example, Japanese Patent Publication No. 58-10508.
No. 5,049,045, a fiber containing a water-swelling resin disclosed in Japanese Patent Application Publication, that is, an inner layer constituting a core made of an acrylic fiber, and processed to swell after absorbing water with high water absorption disposed so as to surround the inner layer. It is a fibrous material having a double structure consisting of a treated outer layer and a composite functional material that combines the function of the core acrylic fiber with the fiber and the function of the outer layer as a highly water-absorbing polymer. It is used as a non-woven fabric, which swells by absorbing moisture from seepage of the waste 20 and permeation of rainwater to form a slippery surface.

In the first and second embodiments, the surface of the lubricating member 14 or the lubricating sheet material 30 is further covered with the protective soil mats 16 and 18 to form a protective structure. The protective structure of the waterproof sheet 12 of the present invention does not necessarily require the protective mats 16 and 18.

[0021]

As described in detail in the above embodiments, the protection structure of the seepage control sheet in the waste disposal site according to the present invention covers the surface of the seepage control sheet and the waste put into the disposal site. It is interposed between the object and the water shield sheet
A lubricating member that causes relative slippage between the waste and the impermeable sheet, and a nonwoven fabric covering the surface of the lubricating member.
Since the protective mat is made of a protective mat, even if a tensile force is applied to the impermeable sheet due to the input waste, the tensile force can be reduced to easily prevent breakage or sagging of the impermeable sheet.

Further, if the surface of the lubricating member is further covered with a protective mat, it is possible to easily prevent a decrease in lubricity of the lubricating member due to direct contact with waste.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a protection structure for a water-impervious sheet according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a schematic explanatory view showing an example of a method for injecting a lubricant.

FIG. 4 is a schematic sectional view showing a second embodiment of the protective structure for a water-impervious sheet according to the present invention.

FIG. 5 is a schematic cross-sectional view of a waterproof structure in a conventional waste disposal site.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waste disposal site 12 Water barrier sheet 14, 30 Lubricity member (30 lubricity sheet material) 14a Water permeable filter material 14b Lubricant 16, 18 Protection mat 20 Waste E Ground

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-146319 (JP, A) JP-A-59-8817 (JP, A) JP-A-59-8816 (JP, A) 176126 (JP, U) Hira 2-58037 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B09B 1/00

Claims (3)

(57) [Claims] 1. A waterproofing sheet protection structure laid on an inclined surface of a waste disposal site, wherein the protection structure covers the surface of the waterproofing sheet and the waste put into the disposal site. The waste and the water-impervious sheet interposed between the water-impervious sheet and
And lubricating member that causes relative sliding between, the lubricating
A protective mat made of a non-woven fabric covering the surface of the permeable member . 2. The impermeable material in a waste disposal site according to claim 1, wherein the lubricating member comprises a permeable filter material and a lubricant injected and filled into the filter material. Seat protection structure. 3. The structure according to claim 1, wherein the lubricating member is made of a fiber material that generates self-lubricating properties by absorbing water.