JP4372465B2 - Laminated sheet for final soil covering - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a sheet used for final covering of a waste disposal site, and more particularly to a final covering sheet capable of removing generated gas while allowing permeation into a waste pit and excellent in economic efficiency. Is.
[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, a variety of sheets used for capping including 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).
In addition, 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]
In view of the problems of the above-mentioned conventional waste disposal site capping structure, the present invention extracts the generated gas while allowing the penetration into the waste pit in order to promote the corrosion of the waste. An object of the present invention is to provide a final soil covering sheet that can be made economically.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the laminated sheet for final covering according to the first aspect of the present invention is a three-layered laminated sheet used between the waste having a uniform surface at the waste disposal site and the final covering, and is made of a nonwoven fabric. A protective sheet, an uneven sheet made of a synthetic resin having a predetermined hole with an apparent thickness H of 8 to 50 mm, a thickness L of 0.5 to 2 mm, a pressure strength of 2 × 10 ⁴ Pa or more, and a non-woven fabric; It is characterized in that the water permeability is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and the layers are sequentially stacked so that the water permeability is 1 × 10 ⁻¹ cm ² / sec or more.
[0008]
The laminated sheet for final soil covering has a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec as a protective sheet made of nonwoven fabric, a concavo-convex sheet made of synthetic resin having predetermined holes and a separation sheet made of nonwoven fabric. In order to form a three-layer laminated sheet by sequentially layering so that the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more, the rain that pours down and penetrates the final covering soil is The amount of water that passes through the internal space and is drained to the peripheral edge of the waste disposal site and leaks into the dump pit from the three-layer laminated sheet is not limited, and the water that has entered the dump pit does not exceed the capacity of the drainage facility. The corrosion of the waste is promoted moderately, and the gas generated by the corrosion is discharged to the outside through the three-layer laminated sheet.
And by setting the apparent thickness H of the concavo-convex sheet to 8 to 50 mm, the thickness L to 0.5 to 2 mm, and the pressure-resistant strength to 2 × 10 ⁴ Pa or more, a necessary and sufficient water passing space can be secured, so Problems related to material strength that occur later are also eliminated.
[0009]
In this case, at least one of the protective sheet and the separation sheet can be integrated and laminated on the uneven sheet.
[0010]
As a result, sheet superposition work and the like can be omitted at the construction site, and the efficiency of the construction itself can be greatly improved.
[0011]
On the other hand, the laminated sheet for final covering according to the second invention is a three-layered laminated sheet used between the waste whose surface is leveled at the waste disposal site and the final covering, and is a protective sheet made of nonwoven fabric, an opening portion A separation sheet made of a synthetic resin net and non-woven fabric with a water content of 60% or less has a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and a water flow performance of 1 × 10 ⁻¹ cm ² / sec. It is characterized by being formed so as to be sequentially stacked.
[0012]
The laminated sheet for final soil covering is a protective sheet made of non-woven fabric, a net made of synthetic resin having an opening of 60% or less, and a separation sheet made of non-woven fabric, having a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / Since the three-layer laminated sheet is formed by sequentially overlapping so that the water flow performance becomes 1 × 10 ⁻¹ cm ² / sec or more in sec, the rain that pours and penetrates on the final covering soil is the three-layer laminated sheet. The amount of water leaking from the three-layer laminated sheet into the dump pit is limited, and the capacity of the drainage facility is not exceeded, and it has entered the dump pit. Water moderately promotes the corrosion of the waste, and the gas generated by the corrosion is discharged to the outside through the three-layer laminated sheet.
[0013]
In this case, at least one of the protective sheet and the separation sheet can be integrated and laminated on the net.
[0014]
As a result, sheet superposition work and the like can be omitted at the construction site, and the efficiency of the construction itself can be greatly improved.
[0015]
Further, 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.
[0016]
Thereby, a necessary and sufficient water passing space can be secured, and the problem relating to the material strength that occurs during and after the work is also solved.
[0017]
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.
[0018]
This makes it easier to form a three-layer laminated sheet having a water permeability 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. Both the protective sheet and the separation sheet have excellent flexibility, strength, and water retention.
[0019]
Further, at least one of the protective sheet and the separation sheet can be a nonwoven fabric made of synthetic fibers.
[0020]
Thereby, corrosion of a protection sheet or a separation sheet is lost, and the laminated sheet for final covering can be maintained for a long time.
[0021]
Further, the three-layer laminated sheet can be used at a waste disposal site provided with a drainage facility.
[0022]
Thereby, the effect | action of the laminated sheet for final soil covering can fully be exhibited, without making a waste disposal site soak.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
1 to 5 show an embodiment of a laminated sheet for final covering of the waste disposal site of the present invention.
This final cover covering laminated sheet 1 is a three-layered laminated sheet 3 used between the waste 2 on which the surface is leveled and the soil 5 is placed and the final covering 4 and penetrates the three-layered laminated sheet 3, that is, In addition, the hydraulic conductivity in the longitudinal direction is 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec, and the water permeability in the direction crossing the three-layer laminated sheet 3 is 1 × 10 ⁻¹ cm ² / sec or more. As described above, the protective sheet 31 made of nonwoven fabric, the concavo-convex sheet 32 made of synthetic resin having predetermined holes 35, and the separation sheet 33 made of nonwoven fabric are sequentially stacked.
[0025]
By being formed in this way, when used in the final covering 4 construction of the waste disposal site, the rain that flows down and penetrates the final covering soil 4 passes through the internal space of the three-layer laminated sheet 3 and is disposed of in the waste disposal site. The amount of water that is drained to the peripheral edge of the surface and leaks from the three-layer laminated sheet 3 into the dump pit 12 is also limited, and the capacity of the drainage facility 11 is not exceeded. 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 laminated sheet 3.
[0026]
The three-layer laminated sheet 3 itself is a fusion means by heating, ultrasonic waves, high frequency, etc., a joining means by hot melt, an adhesive, an adhesive or the like, or a mechanical means such as a screwing. Either the protective sheet 31 and the separation sheet 33 can be integrated on the upper and lower sides of the concavo-convex sheet 32 made of synthetic resin, or the protective sheet 31 and the separation sheet 33 can be integrated on one side of the concavo-convex sheet 32. In this case, sheet overlapping work and the like are omitted at the construction site, and the efficiency of the construction itself is greatly improved.
[0027]
Moreover, as shown in FIG. 1, the uneven | corrugated sheet | seat 32 has the hollow part 37, The apparent thickness H is 8-50 mm (If it is thinner than 8 mm, a water passage space cannot be ensured, and if it is thicker than 50 mm, it is bulky. The thickness L is 0.5-2 mm (if the thickness is less than 0.5 mm, the required strength cannot be ensured, and if it is thicker than 2 mm, there is a problem with flexibility), the hole 35 is moderately (Although it is provided on the top of the unevenness in FIG. 1, it can be provided on the wall portion of the hollow portion, etc., and its formation site is not particularly limited.) The performance is adjusted, and the flat pressure resistance is also regulated to 2 × 10 ⁴ Pa or more.
[0028]
Moreover, although the unevenness | corrugation and the hollow part 37 are provided up and down in FIG. 1, the uneven | corrugated sheet | seat 32 itself is the shape which provided only the convex part which has the hollow part 37 in the upper part, and only the concave part which has the hollow part 37 in the lower part. Also good.
The three-layer laminated sheet 3 formed in this way secures a necessary and sufficient water passage space in the construction of the final covering soil 4 of the waste disposal site, and solves the problem relating to the material strength generated during and after the work. Will do.
[0029]
FIG. 2 shows an example in which the uneven sheet 32 is replaced with a synthetic resin net 34 having an opening 36 of 60% or less, and FIG. 3 shows the shape of the net 34.
The net 34 has an apparent thickness M of 1.5 to 10 mm (necessary strength cannot be secured if the thickness is less than 1.5 mm, and a problem arises in flexibility if it is thicker than 10 mm), and the pressure strength is 2 × 10. It is regulated to ⁴ Pa or more.
Then, like the three-layer laminated sheet 3 using the uneven sheet 32, the rain that pours down and penetrates the final covering soil 4 passes through the internal space of the three-layer laminated sheet 3 and drains to the peripheral edge of the waste disposal site. Is done. Although not shown, the shape of the net 34 is not particularly limited, and includes the above-mentioned squares, rhombuses, turtle shells, and the like.
In addition, when using the net | network 34 for the core material of the laminated sheet 3 of 3 layers, as shown in FIG. 2, the hollow part 37 can be ensured more by changing the thickness of the single yarn which cross | intersects, and the viewpoint of water flow space Is more preferable.
[0030]
Also, in the three-layer laminated sheet 3 using such a synthetic resin net 34, as in the case of the concavo-convex sheet, fusion means by heating, ultrasonic waves, high frequency, etc., hot melt, adhesive, pressure-sensitive adhesive The protective sheet 31 and the separation sheet 33 are placed on the upper and lower sides of the net 34 made of synthetic resin, and the protective sheet 31 and the separation sheet 33 are disposed on one side of the net 34 by physical means such as joining means or screwing. Can be integrated.
[0031]
As in the case of the concavo-convex sheet 32, the sheet superposition work is omitted at the construction site, and the efficiency of the construction itself is greatly improved. Similarly, a necessary and sufficient water passing space can be ensured, and the problem relating to the material strength generated during and after the work can be solved.
[0032]
In addition, as the synthetic resin for forming the uneven sheet 32 and the net 34, a thermoplastic resin can be suitably used because of its good moldability. In particular, olefinic resins such as vinyl vinyl chloride and vinyl acetate, which are highly versatile, are used. A mixture of these synthetic resins, such as polyethylene and polypropylene, and a mixture of these synthetic resins and copolymers such as ethylene-vinyl acetate, elastomers, modified polyolefins and the like can be suitably used.
[0033]
Further, 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 is suitably used for the protective sheet 31, and a spunbond nonwoven fabric having a thickness of 0.2 to 10 mm is suitably used for the separation sheet 33. can, by you select such nonwoven fabric permeability of the nonwoven fabric itself required water flow performance, water retention performance, flexibility, allows the strength, etc., permeability of 1 × 10 to limit the present invention The formation of the three-layer laminated sheet 3 having ⁻² cm / sec to 1 × 10 cm / sec and a water passage performance of 1 × 10 ⁻¹ cm ² / sec or more becomes easier.
[0034]
Further, the protective sheet 31 and the separation sheet 33 may be a nonwoven fabric made of synthetic fibers. In such a case, the protection sheet 31 and the separation sheet 33 are not corroded, and are used for the final soil covering of the waste disposal site of the present invention. The sheet 1 is maintained for a long time.
[0035]
FIG. 4 shows a state in which the final soil covering sheet 1 is used in the waste disposal site where the drainage facility 11 and the water shielding sheet 13 are provided, and the amount of water leaking into the dumping pit 12 from the three-layer laminated sheet 3 is also limited. Therefore, the capacity of the drainage facility 11 is not exceeded.
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 laminated sheet 3.
And the sheet | seat 1 for final covering of the waste disposal site of this invention fully exhibits the effect | action, without making a waste disposal site water immersion.
[0036]
As mentioned above, although the Example of this invention was described, the sheet | seat for final covering of the waste disposal site of this invention is not limited to description of this Example, It changes suitably in the range which does not deviate from the meaning. It is possible.
[0037]
【The invention's effect】
According to the final soil covering sheet of the waste disposal site of the present invention, a protective sheet made of nonwoven fabric, a synthetic resin uneven sheet having predetermined holes, and a separation sheet made of nonwoven fabric have a water permeability of 1 × 10 ⁻² cm. Since the three-layer laminated sheet is formed by sequentially stacking so that the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more at / sec to 1 × 10 cm / sec, rain that pours into and penetrates the final covering soil. Is drained around the surface of the waste disposal site through the internal space of the three-layer laminated sheet, the amount of water leaking from the three-layer laminated sheet into the dump pit is limited, and does not exceed the capacity of the drainage facility, The water that has entered the dump pit moderately promotes the corrosion of the waste, and the gas generated by the corrosion is discharged to the outside through the three-layer laminated sheet.
And by setting the apparent thickness H of the concavo-convex sheet to 8 to 50 mm, the thickness L to 0.5 to 2 mm, and the pressure-resistant strength to 2 × 10 ⁴ Pa or more, a necessary and sufficient water passing space can be secured, so Problems related to material strength that occur later are also eliminated.
[0038]
In this case, by integrating and laminating at least one of the protective sheet and the separation sheet on the concavo-convex sheet, it is possible to omit the sheet stacking operation and the like at the construction site and greatly improve the efficiency of the construction itself.
[0039]
On the other hand, according to the laminated sheet for final covering soil of the second invention, a protective sheet made of nonwoven fabric, a net made of synthetic resin having an opening of 60% or less, and a separation sheet made of nonwoven fabric have a water permeability of 1 × 10 ^−2. From 3 cm / sec to 1 × 10 cm / sec, the three-layer laminated sheet is formed in order so that the water flow performance is 1 × 10 ⁻¹ cm ² / sec or more. Rain passes through the internal space of the three-layer laminate sheet and is drained to the peripheral edge of the waste disposal site. The amount of water leaking from the three-layer laminate sheet into the dump pit is limited, and does not exceed the capacity of the drainage facility. The water that has entered the dump pit moderately promotes the corrosion of the waste, and the gas generated by the corrosion is discharged to the outside through the three-layer laminated sheet.
[0040]
In this case, by integrating and laminating at least one of the protective sheet and the separation sheet on the net, sheet stacking work and the like can be omitted at the construction site, and the efficiency of the construction itself can be greatly improved.
[0041]
Moreover, 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, and there is a problem relating to the material strength generated during and after the work. Will be resolved.
[0042]
Also, the short fiber nonwoven fabric of spunbonded nonwoven fabric or thickness 5~20mm the protective sheet thickness 2 to 10 mm, by the separation sheet is spunbonded nonwoven fabric having a thickness of 0.2 to 10 mm, permeability is 1 × ¹⁰ -2 cm / Sec to 1 × 10 cm / sec, it becomes easier to form a three-layer laminate sheet having a water flow performance of 1 × 10 ⁻¹ cm ² / sec or more, and both the protective sheet and the separation sheet have excellent flexibility. Will have strength, water retention.
[0043]
Moreover, by using at least one of the protective sheet and the separation sheet as a non-woven fabric made of synthetic fibers, the protection sheet and the separation sheet are not corroded, and the final soil covering laminated sheet can be maintained for a long time.
[0044]
In addition, by using a three-layer laminated sheet at a waste disposal site where drainage facilities are provided, the final soil covering laminated sheet can fully function without submerging the waste disposal site. Can be made.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view showing a first embodiment of a laminated sheet for final covering according to the present invention.
FIG. 2 is an enlarged sectional view showing a second embodiment of the laminated sheet for final covering according to the present invention.
FIG. 3 is a plan view showing an example of a net.
FIG. 4 is a cross-sectional view showing a capping structure of a waste disposal site using the final covering soil laminated sheet of the present invention.
FIG. 5 is an enlarged cross-sectional view of the main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laminated sheet for last covering 11 Drainage facility 12 Dumping pit 13 Water shielding sheet 2 Waste 3 Three layer laminated sheet 31 Protective sheet 32 Uneven sheet 33 Separation sheet 34 Net 35 Hole 36 Opening 37 Hollow part 4 Final covering 5 Leveling Soil H Apparent thickness of uneven sheet L Thickness of uneven sheet M Apparent thickness of net

Claims (8)

A three-layer laminated sheet used between the waste whose surface is leveled at the waste disposal site and the final soil covering, a protective sheet made of nonwoven fabric, an apparent thickness H of 8 to 50 mm, and a thickness L of 0.5 to 2 mm The pressure-sensitive strength is 2 × 10 ⁴ Pa or more, and the separation sheet made of a synthetic resin concavo-convex sheet and a nonwoven fabric having a predetermined hole has a water permeability of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec, A laminated sheet for final covering, characterized by being formed by sequentially overlapping so that the water passage performance is 1 × 10 ⁻¹ cm ² / sec or more.   The laminated sheet for final covering according to claim 1, wherein at least one of the protective sheet and the separation sheet is integrally laminated on the uneven sheet. A three-layered laminated sheet used between the waste whose surface is leveled at the waste disposal site and the final covering soil, comprising a protective sheet made of nonwoven fabric, a net made of synthetic resin having an opening of 60% or less, and a nonwoven fabric The separation sheet is characterized in that it has a water permeability coefficient of 1 × 10 ⁻² cm / sec to 1 × 10 cm / sec and is formed by sequentially overlapping so that the water passage performance is 1 × 10 ⁻¹ cm ² / sec or more. Laminated sheet for final soil covering. The laminated sheet for final covering according to claim 3 , wherein at least one of the protective sheet and the separation sheet is integrally laminated on the net. 5. The laminated sheet for final covering according to claim 3 or 4 , wherein the apparent thickness of the net is 1.5 to 10 mm and the pressure resistance 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. Or the laminated sheet for final earth covering of 5 . The laminated sheet for final covering according to claim 1, 2, 3, 4, 5 or 6 , wherein at least one of the protective sheet and the separation sheet is a nonwoven fabric made of synthetic fibers. The laminated sheet for final covering according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the three-layer laminated sheet is used in a waste disposal site provided with a drainage facility.

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