JPH1157644A - Removing method for rain water in waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing rain water in a waste disposal site in which rain water is rapidly flowed down toward drainage facilities by easily and forcedly draining rain water retained on a seepage control sheet. SOLUTION: In the method for removing rain water in a waste disposal site, the waste disposal site is divided into a plurality of sections 20. While the landfill layer of waste 13 in a part of the sections 20 is covered with a seepage control sheet 14 and landfill work of waste 13 is continued in the other section 20', landfill of waste 13 is performed. A drainage channel 30 is provided around the sections 20 covered with the seepage control sheet 14. Also, in the case of covering the landfill layer, air bags 31 are interposed between the upper face of the landfill layer and the seepage control sheet 14. When rain water deposits on the upper face of the laid seepage control sheet 14, air is supplied into the air bags 31 to expand them. Rain water is flowed into the drainage channel 30 and drained by raising the seepage control sheet 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing rainwater in a waste disposal site, and more particularly, to dividing a waste disposal site into a plurality of sections and impermeable to a waste landfill layer in some sections. The present invention relates to a method for removing rainwater in a waste disposal site where a waste is landfilled while being covered with a sheet while performing a landfill operation of the waste in another section.

[0002]

2. Description of the Related Art Landfill type landfills for dumping industrial waste and general waste are disposed inside a concave ground created by using natural terrain or excavating or embanking the ground. Landfilling and storing things. According to such a waste disposal site, in order to prevent environmental pollution due to the infiltration of sewage leached from the landfill waste into the ground, it is necessary to carry out waterproofing work in advance on the bottom and slopes (entire surface) of the disposal site. Mandatory. Conventionally, a method of laying a soft synthetic resin-based or rubber-based water-impervious sheet from the viewpoint of economy and water-impermeability has been generally adopted as a water-impervious work at the bottom of such a disposal site.

[0003] In such a waste disposal site, the rainwater that has fallen into the disposal site during the landfill operation and that has infiltrated the waste and formed leachate is distributed on the upper surface of the seepage control at the bottom of the disposal site. The collected leachate is collected in a drainage collection drainage pipe, and discharged to the outside of the disposal site via the collection drainage pipe.

[0004] On the other hand, according to such a conventional method of treating rainwater during a landfill operation, most of the rainwater that has fallen into a disposal site is discharged as leachate that has passed through waste. In order to discharge to the surrounding environment such as a river, it is necessary to perform water treatment in advance, and a large-scale water treatment facility is required to treat such a large amount of leachate.

[0005] For this reason, in order to reduce the amount of rainwater that permeates the waste and reduce the amount of treatment by the water treatment facility, for example, Japanese Patent Application No. 9-188790 filed by the present applicant discloses a landfill. There has been proposed a method of landfilling waste in which the amount of rainwater permeated into the waste is reduced by performing the landfill work while covering the waste layer with a waterproof sheet.

That is, according to such a landfill method, the waste disposal site is divided into a plurality of sections, and in each section, after the reclamation work of each landfill layer in the section is completed, the waste in the section is When laying and laying a seepage control sheet over land, and further burying waste in the upper layer, temporarily remove the seepage control sheet in the relevant section while covering the waste in other sections with the seepage control sheet. After performing the landfill work, the work of deploying and laying the impermeable sheet over the waste of the section again is repeated in each section, and while removing the rainwater poured onto the impermeable sheet, The waste will be landfilled in a waste disposal site.

[0007]

However, according to the above-mentioned conventional landfill method, rainwater is shut off by a water-impervious sheet laid over the waste, thereby effectively preventing rainwater from penetrating into the waste. On the other hand, it is necessary to allow rainwater that has fallen on the impermeable sheet to quickly flow down to the drainage facility without staying for a long time.

Accordingly, the present invention has been made in view of such a conventional problem, and the rainwater retained on the seepage control sheet is easily forcibly drained from the compartment, and the rainwater is promptly discharged to a drainage facility. It is an object of the present invention to provide a method for removing rainwater at a waste disposal site that can be made to flow down.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the gist of the present invention is to divide a waste disposal site into a plurality of sections and to bury waste in some sections. A method of removing rainwater at a waste disposal site where landfill is performed while landfilling the waste while performing landfill work on the waste while covering the layer with a waterproof sheet,
When covering the landfill layer with the impermeable sheet, an air bag is interposed between the upper surface of the landfill layer and the impermeable sheet, and when rainwater stays on the upper surface of the laid impermeable sheet, air is blown into the air bag. A method for removing rainwater at a waste disposal site, characterized in that rainwater is drained by supplying and expanding the water, and lifting up a water-impervious sheet.

According to the method for removing rainwater in a waste disposal site of the present invention, the air bag is interposed between the upper surface of the landfill layer and the impermeable sheet in a state where it has not been expanded yet. When rainwater accumulates on the upper surface of the waterproof sheet in the section covered by the waterproof sheet, air is supplied to the air bag to inflate and lift the waterproof sheet, for example, drainage grooves provided around the relevant section. Rainwater can easily flow into the water, and the rainwater can quickly flow down to the drainage facility through the drainage ditch.

[0011]

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
According to this embodiment, as shown in FIG. 1, the waste disposal site 10 uses a natural or artificial slope 11 and a main dam 12 or a foot dam 16 formed by embankment in front of the same. And a concave ground formed between them.

According to the waste disposal site 10,
The waste disposal site 10 is divided into a plurality of sections 20, and in each section 20, after the reclamation work of each reclamation layer of the section 20 is finished, the waste 13 of the section 20 is covered and a waterproof sheet is provided. 14 is deployed and laid, and the waste 13 is buried in the upper layer. When the waste 13 of the other section 20 is covered with the sheet 14, the waterproof sheet 14 of the section 20 ′ is temporarily After removing and performing the landfill work, the work of deploying and laying the impermeable sheet 14 again covering the waste 13 of the section 20 ′ is repeated in each section 20, and the rainwater poured on the impermeable sheet 14 is eliminated. In addition, the landfill operation is performed by sequentially burying the waste 13 toward the upper layer.

According to this embodiment, each waste layer is buried so that the surface thereof has a downward slope of, for example, about 3 to 5% toward the main dam 12 or the foot dam 16, and such a descending slope is formed. Compartment 20 located upstream of the slope
The landfill work is performed sequentially from the first to the second section located on the downstream side, so that the rainwater that has fallen on the surface of the impermeable sheet 14 can smoothly flow down to the main dam 12 and the foot dam 16. I can do it.

According to this embodiment, even when rainwater falls into the waste disposal site 10 due to rainfall during the reclamation work in this way, much of such rainwater is quickly removed. It is possible to easily prevent rainwater from permeating into the waste 13 by draining from the disposal site 10.

That is, the landfilled waste 13 is
Since almost the entire area of the surface is covered with the impermeable sheet 14, the penetration of rainwater into the waste 13 is easily blocked, and in each section 20 covered by the impermeable sheet 14, Rainwater remaining on the surface of the impermeable sheet 14 is removed from the section 20 by the method for removing rainwater according to this embodiment, and is directed toward a drainage facility for draining rainwater from the inside of the disposal site 10 to the outside. It will flow down.

Here, the drainage facility includes the waste 13 covered with the impermeable sheet 14 and the main dam 12 and the foot dam 16.
A drain pipe 25, a drain tank 19, a drain pump 26, or a manhole 18 provided inside an embankment constituting the main dam 12 and a connecting pipe between these manholes 18 provided at a sloping portion with the like. 23, drainage tunnel 1
7 and the like.

According to this embodiment, each section 2
When the landfill layer of the waste 13 is covered with the impermeable sheet 14, as shown in FIG. 2, a drain groove 30 is provided around the section 20, and the upper surface of the landfill layer and the impermeable sheet 14 Between them, the air bag 31 is interposed in a state where it has not yet been inflated.

The drain 30 is provided around a plurality of sections along a downward slope toward the main dam 12 and the foot dam 16, so that the drain 30 is provided at both ends in the upstream and downstream directions. The section 20 that is located has three sides connected to the drain 30, and the section 20 between them has two sides connected to the drain 30 on both sides. That is, the periphery of the section where the drainage groove is provided in the present invention does not necessarily mean that the entire circumference of each section 20 is directly connected to the drainage groove 30.

In order to install the air bladder 31 in each section 20, for example, when the reclamation work of each waste layer is completed,
The air bag 31 is disposed on the upper surface of the water barrier sheet 14 and then the air bag 31 is laid on the inner surface of the water barrier sheet 14 in addition to the method of laying the water barrier sheet 14 over the air bag 31 provided thereafter. , The air bag 3
1 can also be installed.

Here, in each section 20, an air bag 31
Are arranged side by side on the upper surface of the landfill layer so as to extend along the downward slope, and inflate from the central air bag 31 toward the side air bag 31. In this case, the diameter of the diameter after the reduction is sequentially reduced. An air hose is connected to each of the air bags 31, and air is supplied from a compressor or the like via the air hoses.
An air vent valve is attached to 1 so that air can be removed from the inflated air bag 31 and returned to a flat state as appropriate.

According to this embodiment, while the amount of rainfall in rainy weather is small, the rainwater naturally flows down the surface of the impermeable sheet 14 due to the downward slope of the landfill layer, and the rainwater flows downstream of the drain groove 30. After flowing into the drain gutter 30 or the drainage basin 33 through the drain outlet 32 provided at the side end, it flows down toward the drainage facility (see FIG. 2, A).

On the other hand, when the amount of rainfall increases and the water cannot be completely removed from the drain port 32, the rainwater gradually accumulates on the upper surface of the impermeable sheet 14 (see FIG. 2B).
When the amount of stagnation increases, air is supplied to the air bladder 31 to inflate it, and the rainwater flows into the drain 30 by lifting the impermeable sheet 14 (see FIG. 2C). It can be easily drained. In addition,
In FIG. 2, what is indicated by reference numeral 35 is a weight that is appropriately used when laying the impermeable sheet 14,
When the impermeable sheet 14 is lifted by the inflation of the air bag 31, it is easily removed.

Here, the work of supplying air to the air bag 31 is performed from the upstream section 20 to the downstream section 20 of the plurality of sections 20 surrounded by the drain grooves 30 so that the rainwater is supplied. The backflow can be easily prevented, and the five air bladders 31 in each section 20 are sequentially inflated from the central air bladder 31 to the side air bladders 31 to efficiently and efficiently drain water. The drainage of rainwater to 30 can be performed.

That is, according to this embodiment, it is possible to easily forcibly drain rainwater remaining on the impermeable sheet 14 and to quickly flow down the drainage facility.

When the retained rainwater is drained, the air can be evacuated from the air bag 31 to return to a state in which the rainwater can be retained again, and the retained rainwater is stored by closing the drain port 32, for example. By setting it up, it can be used as watering etc.

The present invention is not limited to the embodiment of the above embodiment, but can be variously modified and adopted within the scope of the constitution described in the claims. For example, the surface of the landfill layer on which the impermeable sheet is laid is not necessarily required to have a downward slope,
It can also be employed in a state where the gradient of the landfill layer is not yet adjusted. In addition, it is not always necessary to provide a drainage groove around the section covered by the impermeable sheet.

[0027]

As described above in detail, according to the method for removing rainwater in a waste disposal site according to the present invention, when the landfill layer of the relevant section is covered with the impermeable sheet, the upper surface of the landfill layer is removed. An air bag is interposed between the impermeable sheet and rainwater is deposited on the upper surface of the laid impermeable sheet, and air is supplied to the air bag to inflate and lift the impermeable sheet to drain the rainwater. The rainwater remaining on the impermeable sheet can be easily forcibly drained from the section, and can quickly flow down to the drainage facility.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a waste disposal site employing a method for removing rainwater according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating a method for removing rainwater according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waste disposal site 12 Main embankment 13 Waste 14 Water barrier sheet 20, 20 'section 30 Drainage 31 Air bag

Claims (1)

[Claims] 1. A waste disposal site is divided into a plurality of sections, and while a landfill layer for waste in some sections is covered with a water-impervious sheet, disposal is performed while landfilling waste in other sections. A method for removing rainwater at a waste disposal site where landfills are filled, wherein when covering the landfill layer with a water-impervious sheet, an air bag is interposed between the upper surface of the landfill layer and the water-impervious sheet. If rainwater stagnates on the upper surface of the laid water-impervious sheet, air is supplied to the air bag to inflate it, and the rainwater is drained by lifting the water-impervious sheet. .