JP2005007264A - Capping structure at waste disposal site - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a highly versatile material without needing special labor for its construction. <P>SOLUTION: Protective sheets 4 formed of nonwoven fabric, irregular sheets 5 made of synthetic resin having given holes 50 and separation sheets 7 formed of nonwoven fabric are laid on flattened surface of waste 2 in order, to have a water permeation factor of the three-layered body of 1×10<SP>-2</SP>to 1×10 cm/sec, and water permeation performance of 1×10<SP>-1</SP>cm<SP>2</SP>/sec or more, and soil covering 8 is provided thereon. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a capping structure for a waste disposal site having a drainage facility, and more particularly to a capping structure for a waste disposal site where a highly versatile material can be used and no special effort is required for its construction. .
[0002]
[Prior art]
Conventionally, a disposal site filled with waste has been covered with soil over the entire surface, and the disposal site has been closed.
However, recently, gas generated from the waste has become a problem, and in order to remove this gas, various types of sheets used for capping, including the final covering, structures and construction methods using these have been proposed. .
[0003]
As a capping structure of such a waste disposal site, for example, on the surface layer of the disposal site, a part having water-impervious or hardly water-permeable properties, a drainage facility along its lower edge, and a side opposite to the drainage facility. There is known a final earth covering method in which portions having water permeability are alternately formed in a strip shape (see, for example, Patent Document 1).
Also, as a capping structure for other waste disposal sites, a waste disposal facility that covers the entire top surface of the disposal site with a breathable waterproof sheet having air permeability and waterproofness is also well known (for example, Patent Documents). 2).
[0004]
[Patent Document 1]
Japanese Patent No. 3354920 [Patent Document 2]
Japanese Patent Laid-Open No. 11-10104
[Problems to be solved by the invention]
However, although the former is premised on allowing a small amount of water to penetrate into the waste, it is a construction method that requires enormous labor for its construction. It is a premise that no permeation is allowed. For this reason, a very expensive moisture-permeable waterproof sheet is used, and there remains a problem in its economical efficiency.
[0006]
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a capping structure for a waste disposal site that can use a highly versatile material and does not require special labor for its construction. And
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a capping structure for a waste disposal site according to the first aspect of the present invention is a final capping structure for a waste disposal site having a drainage facility. A protective sheet, a concavo-convex sheet made of a synthetic resin having a predetermined hole, and a separation sheet made of a nonwoven fabric, the water permeability of these three-layer bodies is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec, and water is passed through It is characterized in that the performance is 1 × 10 ⁻¹ cm ² / sec or more and the layers are sequentially stacked and covered with soil.
[0008]
This waste disposal site capping structure is a waste disposal site having a drainage facility. On the waste whose surface is leveled, a protective sheet made of a nonwoven fabric, a synthetic resin uneven sheet and a nonwoven fabric having predetermined holes. The separation sheet consisting of the three layers is sequentially such that the water permeability of these three-layer bodies is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more. Overlaying and covering the soil on top of it, the rain that pours down and penetrates through the covering soil passes through the inside of the three-layer body and drains to the peripheral edge of the waste disposal site, and the amount of water that the three-layer body leaks into the dump pit is also limited In addition, the capacity of the drainage facility is not exceeded, and the water that has entered the dumping pit moderately promotes the corrosion of the waste, and the gas generated by the corrosion can be discharged to the outside through the three-layer body.
[0009]
In this case, the apparent thickness of the concavo-convex sheet can be 8 to 50 mm, the thickness can be 0.5 to 2 mm, and the pressure resistance can be 2 × 10 ⁴ Pa or more.
[0010]
As a result, a necessary and sufficient water flow space can be secured, and the problem relating to the material strength that occurs during and after the work can be solved.
[0011]
The capping structure of the waste disposal site of the second invention is a final capping structure of a waste disposal site having a drainage facility, and a protective sheet made of nonwoven fabric, an opening on the waste whose surface is leveled A separation sheet made of a synthetic resin net and nonwoven fabric with a rate of 60% or less, the water permeability of these three-layer bodies is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec, and the water flow performance is 1 × It is characterized in that it is sequentially stacked so as to be 10 ⁻¹ cm ² / sec or more, and a covering soil is provided thereon.
[0012]
The capping structure of this waste disposal site is a waste disposal site having drainage facilities, a protective sheet made of non-woven fabric, a synthetic resin net having an opening ratio of 60% or less, The separation sheet made of a nonwoven fabric has a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and a water passage performance of 1 × 10 ⁻¹ cm ² / sec or more. Since the soil is piled up and covered with soil, the rain that pours down and penetrates the soil passes through the inside of the three-layer body and drains to the peripheral edge of the waste disposal site, and the amount of water that the three-layer body leaks into the dump pit. It is limited and does not exceed the capacity of the drainage facility, and the water that has entered the dumping pit moderately promotes the corrosion of the waste, and the gas generated by the corrosion can be discharged to the outside through the three-layer body.
[0013]
In this case, the apparent thickness of the net can be 1.5 to 10 mm, and the pressure resistance can be 2 × 10 ⁴ Pa or more.
[0014]
As a result, similarly, a necessary and sufficient water passing space can be secured, and the problem relating to the material strength generated during and after the work can be solved.
[0015]
Moreover, the protective sheet can be a spunbonded nonwoven fabric having a thickness of 2 to 10 mm, a short fiber nonwoven fabric having a thickness of 5 to 20 mm, and a separation sheet having a thickness of 0.2 to 10 mm.
[0016]
This makes it easier to form a three-layer body having a water permeability coefficient of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and a water flow performance of 1 × 10 ⁻¹ cm ² / sec or more, and a protective sheet. Both separation sheets have excellent flexibility, strength and water retention.
[0017]
Further, at least one of the protective sheet and the separation sheet can be a nonwoven fabric made of synthetic fibers.
[0018]
As a result, the protection sheet and the separation sheet are not corroded, and the capping structure of the waste disposal site of the present invention is maintained over a long period of time.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
1 to 2 show an embodiment of a capping structure for a waste disposal site according to the present invention.
This waste disposal site capping structure 1 is a waste disposal site 10 having a drainage facility 11 at the bottom of a dumping pit 12, and a protective sheet 4 is provided on the top of the waste 2 provided with a leveling portion 3 on its surface. The uneven sheet 5 made of synthetic resin is laminated thereon, the separation sheet 7 is laminated thereon, and the covering soil 8 is laminated thereon.
In this case, the leveling part 3 can be formed by leveling the surface of the waste 2 itself or by separately embedding with earth and sand.
[0021]
Moreover, the cross-sectional view of FIG. 3 shows a three-layer body 9 of a protective sheet 4, an uneven sheet 5, and a separation sheet 7, and a water permeability coefficient in the direction of longitudinally cutting the three-layer body 9 is 1 × 10 ⁻² cm / sec. It is regulated so that the water passage performance in the transverse direction is 1 × 10 ⁻¹ cm ² / sec or more at 1 × 10 cm / sec.
[0022]
The concavo-convex sheet 5 has an apparent thickness H of 8 to 50 mm and a thickness L of 0.5 to 2 mm, is appropriately provided with holes 50 to adjust its water permeability, and has a hollow portion 51 to allow water flow. Performance is ensured, and the flat withstand pressure strength is also regulated to 2 × 10 ⁴ Pa or more.
Moreover, although the unevenness | corrugation and the hollow part are provided up and down in FIG. 3, the uneven | corrugated sheet | seat 5 itself may be a shape which provided only the convex part which has a hollow part in the upper part, and only the concave part which has a hollow part in the lower part. Good.
In addition to the top part of the uneven | corrugated sheet 5, a hole can be provided in the wall part etc. of a hollow part, The formation site | part is not specifically limited.
Furthermore, a spunbond nonwoven fabric having a thickness of 2 to 10 mm or a short fiber nonwoven fabric having a thickness of 5 to 20 mm can be suitably used for the protective sheet 4, and a spunbond nonwoven fabric having a thickness of 0.2 to 10 mm can be suitably used for the separation sheet 7. By selecting such a non-woven fabric, the necessary non-woven fabric itself can have a water permeability coefficient, water permeability performance, water retention performance, flexibility, strength, etc., and the water permeability coefficient limited by the present invention is 1 × 10 ^−2. The formation of the three-layer body 9 having a cm / sec to 1 × 10 cm / sec and a water passage performance of 1 × 10 ⁻¹ cm ² / sec or more becomes easier.
[0023]
On the other hand, FIG. 4 shows another embodiment of the capping structure. Instead of the concavo-convex sheet 5, a net 6 made of synthetic resin having an opening ratio of 60% or less is used.
The net 6 has an aperture ratio of 60% or less, an apparent thickness of 1.5 to 10 mm, and a pressure strength of 2 × 10 ⁴ Pa or more.
[0024]
The capping structure of this waste disposal site comprises a three-layer body 9 by the protective sheet 4, the corner net 6 and the separation sheet 7, and the hydraulic conductivity in the direction in which the three-layer body 9 also runs vertically is 1 × 10. ^-2 cm / sec to 1 × 10 cm / sec, and the water passage performance in the crossing direction is regulated to be 1 × 10 ⁻¹ cm ² / sec or more.
[0025]
FIG. 5 shows an example of the net 6. Although not shown, the shape of the net 6 includes not only the above-mentioned corners but also rhombuses and turtle shells, and is not particularly limited.
Thus, when using the net 6 for the core material of the three-layer body 9, as shown in FIG. 4, the hollow part 61 can be secured more by changing the thickness of the intersecting single yarn, and the viewpoint of the water flow space Is more preferable.
[0026]
And the three-layer body 9 formed using the uneven sheet 5 and the net 6 as a core material in this way secures a necessary and sufficient water passing space in the hollow portions 51 and 61 in the capping structure of the waste disposal site, The problem relating to the material strength generated during and after the work is also solved.
[0027]
In addition, as the synthetic resin for forming the uneven sheet 5 and the net 6, a thermoplastic resin can be suitably used because of its good moldability. In particular, olefinic resins such as vinyl-based vinyl chloride and vinyl acetate having high versatility are used. Mixtures of these synthetic resins such as polyethylene and polypropylene, and mixtures of these synthetic resins with copolymers such as ethylene-vinyl acetate, elastomers, modified polyolefins and the like can be suitably used.
[0028]
The three-layer body 9 is a bonding means using heating, ultrasonic waves, high-frequency waves, etc., or a bonding means using hot melt, adhesive, adhesive, etc. 4 and the separation sheet 7 or by integrating either the protective sheet 4 or the separation sheet 7 on one side of the concavo-convex sheet 5, the work of superimposing these sheets on the construction site can be omitted, and the efficiency of the construction itself Will be greatly improved.
[0029]
Further, the protective sheet 4 or the separation sheet 7 may be a nonwoven fabric made of synthetic fibers. In such a case, the protection sheet 4 or the separation sheet 7 is not corroded, and the capping structure of the waste disposal site 10 of the present invention is eliminated. 1 will be maintained for a long time.
[0030]
As described above, when the capping structure of the waste disposal site according to each embodiment of the present invention is used for the final soil covering work of the waste disposal site, the rain that pours into and penetrates the soil covering 8 is the inside of the three-layer body 9. The amount of water that passes through the space and drains to the periphery of the surface of the waste disposal site 10 and leaks from the three-layer body 9 into the dumping pit 12 is limited and does not exceed the capacity of the drainage facility. Further, the water that has entered the dumping pit 12 moderately promotes the corrosion of the waste 2, and the gas generated by the corrosion is discharged to the outside through the three-layer body 9.
[0031]
As mentioned above, although the Example of this invention was described, the capping structure of the waste disposal site of this invention is not limited to description of this Example, It can change suitably in the range which does not deviate from the meaning. Is possible.
[0032]
【The invention's effect】
According to the capping structure of the waste disposal site of the first invention, in the waste disposal site having a drainage facility, a protective sheet made of nonwoven fabric and a synthetic resin having a predetermined hole on the waste whose surface is leveled Separation sheets made of a concavo-convex sheet and a non-woven fabric have a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and a water permeability of 1 × 10 ⁻¹ cm ² / sec. Since it is piled up sequentially so that it becomes the above, and the covering soil is provided on it, the rain that pours into the covering soil and permeates through the inside of the three-layer body is drained to the periphery of the surface of the waste disposal site, and the three-layer body is a dumping pit The amount of water leaked inside is limited and does not exceed the capacity of the drainage system. Water that has entered the dumping pit moderately promotes the corrosion of the waste and discharges the gas generated by the corrosion to the outside through the three layers. be able to.
[0033]
In this case, by setting the apparent thickness of the concavo-convex sheet to 8 to 50 mm, the thickness to 0.5 to 2 mm, and the pressure strength to 2 × 10 ⁴ Pa or more, a necessary and sufficient water passing space can be secured, and during and after the work Problems related to the material strength to be generated are also eliminated.
[0034]
Moreover, according to the capping structure of the waste disposal site of the second invention, in the waste disposal site having drainage facilities, the protective sheet made of nonwoven fabric on the waste whose surface is leveled, the opening ratio is 60% Separation sheets made of the following synthetic resin nets and nonwoven fabrics have a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and a water permeability of 1 × 10 ⁻¹ cm. ² / sec or more are stacked one after another, and a cover soil is provided thereon. Therefore, rain that falls on the cover soil and permeates through the inside of the three-layer body is drained to the periphery of the surface of the waste disposal site. The amount of water that leaks into the dump pit is limited and does not exceed the capacity of the drainage facility. Water that has entered the dump pit moderately promotes the corrosion of the waste, and the gas generated by the corrosion is externally passed through the three-layer body. Can be discharged into That.
[0035]
In this case, by setting the apparent thickness of the net to 1.5 to 10 mm and the pressure strength to 2 × 10 ⁴ Pa or more, a necessary and sufficient water passing space can be secured in the same manner, and the material generated during and after the work. The problem related to strength is also solved.
[0036]
Moreover, a water-permeability coefficient is 1 * 10 < ^- > by making a protection sheet into a spunbond nonwoven fabric with a thickness of 2-10 mm or a short fiber nonwoven fabric with a thickness of 5-20 mm, and a separation sheet into a spunbond nonwoven fabric with a thickness of 0.2-10 mm. ^{2 cm / sec~1 × 10cm / sec} , formation of the tri-layer water flow performance is 1 × ¹⁰ -1 ^cm 2 / sec or more easier, the protective sheet and the separation sheet excellent in both flexibility, It will have strength and water retention.
[0037]
Moreover, by using at least one of the protective sheet and the separation sheet as a nonwoven fabric made of synthetic fibers, the protection sheet and the separation sheet are not corroded, and the capping structure of the waste disposal site of the present invention is maintained for a long period of time. It will be.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of a capping structure for a waste disposal site according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the main part.
FIG. 3 is an enlarged cross-sectional view showing a three-layer body using an uneven sheet.
FIG. 4 is an enlarged cross-sectional view showing a three-layer body using a net.
FIG. 5 is a plan view showing an example of a net.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Capping structure 10 Waste disposal site 11 Drainage facility 12 Dumping pit 13 Water shielding sheet 14 Water shielding surface 2 Waste 3 Leveling part 4 Protective sheet 5 Uneven sheet 50 Hole 51 Hollow part 6 Net 60 Opening part 61 Hollow part 7 Separation sheet 8 Cover soil 9 Trilayer H Appearance thickness L of uneven sheet Thickness M of uneven sheet Appearance thickness of net

Claims (6)

A final capping structure of a waste disposal site having a drainage facility, on a waste whose surface is leveled, a protective sheet made of nonwoven fabric, an uneven sheet made of synthetic resin having predetermined holes, and a separation sheet made of nonwoven fabric Are sequentially stacked such that the water permeability of these three-layer bodies is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more. A capping structure for a waste disposal site, characterized in that it is covered with soil. 2. A capping structure for a waste disposal site according to claim 1, wherein the irregular sheet has an apparent thickness of 8 to 50 mm, a thickness of 0.5 to 2 mm, and a compressive strength of 2 × 10 ⁴ Pa or more. A final capping structure for a waste disposal site having a drainage facility, on a waste whose surface is leveled, a protective sheet made of non-woven fabric, a net made of synthetic resin with an opening ratio of 60% or less, and a non-woven fabric separation The sheets are sequentially stacked so that the water permeability of these three-layer bodies is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more, A capping structure for a waste disposal site, characterized by having a covering soil on top. ^4. A capping structure for a waste disposal site according to claim 3, wherein the apparent thickness of the net is 1.5 to 10 mm and the pressure strength is 2 × 10 ⁴ Pa or more. The protective sheet is a spunbond nonwoven fabric having a thickness of 2 to 10 mm or a short fiber nonwoven fabric having a thickness of 5 to 20 mm, and the separation sheet is a spunbond nonwoven fabric having a thickness of 0.2 to 10 mm. The capping structure of the described waste disposal site. 6. The capping structure for a waste disposal site according to claim 1, wherein at least one of the protective sheet and the separation sheet is a nonwoven fabric made of synthetic fibers.

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