JP3758327B2 - How to drain rainwater at a waste disposal site - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for draining rainwater in a waste disposal site, and in particular, the waste disposal site is divided into a plurality of sections, and the landfill layer of the waste in some sections is covered with a water shielding sheet, The present invention relates to a method for removing rainwater in a waste disposal site in which waste is landfilled while waste is being landfilled in a section.
[0002]
[Prior art]
Landfill-type waste disposal sites that dump industrial waste and general waste store landfills in a concave ground created by using natural landforms or excavating and embedding ground. It will be going. According to such a waste disposal site, in order to prevent environmental pollution due to underground infiltration of sewage leached from landfilled waste, it is possible to implement a water shielding work in advance on the bottom and slopes (entire surface) of the disposal site. Mandatory. In addition, as a water shielding work at the bottom of such a disposal site, a method of laying, for example, a soft synthetic resin-based or rubber-based water shielding sheet has been generally employed from the viewpoint of economy and water shielding.
[0003]
And in such a waste disposal site, rainwater poured into the disposal site during landfilling work and permeating the waste to become leached water was disposed on the upper surface of the impervious work at the bottom of the disposal site. It is collected in the leachate collection drainage pipe and discharged to the outside of the disposal site through this collection drainage pipe.
[0004]
On the other hand, according to such a conventional method for treating rainwater during landfill work, most of the rainwater poured into the disposal site is discharged as leachate that has passed through the waste. In order to flow out to the surrounding environment, it is necessary to perform water treatment in advance, and in order to treat such a large amount of leachate, a large-scale water treatment facility is required.
[0005]
For this reason, in order to reduce the amount of rainwater that permeates waste and reduce the amount of treatment by the water treatment facility, for example, Japanese Patent Application No. 9-188790 related to the application of the present applicant discloses landfill disposal There has been proposed a landfill method for waste that reduces the amount of rainwater permeating into the waste by performing landfill work while covering the material layer with a water shielding sheet.
[0006]
That is, according to the landfill method, the waste disposal site is divided into a plurality of sections, and in each section, after the landfill operation of each landfill layer of the section is completed, the waste in the section is covered. When deploying a waterproof sheet and burying waste in the upper layer, the waste sheet in the other section is temporarily removed and landfilled while the waste from other sections is covered with the waterproof sheet. After working, repeat the work of expanding and laying the water shielding sheet covering the waste in the section again in each section, eliminating the rainwater that has poured onto the water shielding sheet, and sequentially moving the waste toward the upper layer Landfill in a waste disposal site.
[0007]
[Problems to be solved by the invention]
However, according to the conventional landfill method described above, it is possible to effectively prevent rainwater from penetrating into the waste by blocking rainwater with the water shielding sheet laid over the waste. On the other hand, it is necessary to allow the rain water that has poured onto the water-impervious sheet to flow quickly toward the drainage facility without staying for a long time.
[0008]
Therefore, the present invention has been made paying attention to such a conventional problem, and rain water staying on the water-impervious sheet is easily forcibly drained from the section and allowed to quickly flow down to the drainage facility. The purpose is to provide a method for removing rainwater at a waste disposal site.
[0009]
[Means for Solving the Problems]
The present invention has been made to achieve the above object, and the gist of the present invention is that the waste disposal site is divided into a plurality of sections, and the landfill layer of the waste in some of the sections is covered with a water shielding sheet. , A method for removing rainwater in a waste disposal site in which waste is landfilled while performing waste landfill work in other sections, wherein the landfill layer is covered with a water shielding sheet. If an air bag is interposed between the upper surface of the sheet and the water shielding sheet, and rainwater stays on the upper surface of the laid water shielding sheet, air is supplied to the air bag to inflate it and drain the rainwater by lifting the water shielding sheet. There is a method for draining rainwater at a waste disposal site.
[0010]
And according to the method for draining rainwater in the waste disposal site of the present invention, since the air bag is interposed between the upper surface of the landfill layer and the water-impervious sheet in an unexpanded state, When rainwater stays on the upper surface of the water shielding sheet in the section covered by the sheet, air is supplied to the air bag to inflate it, and the water shielding sheet is lifted, for example, to collect rainwater in a drain groove provided around the section. It is possible to easily flow in, and to quickly drain and drain rainwater toward the drainage facility through the drainage groove.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
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 pier 16 constructed by embankment in front of the slope 11. It is comprised by the concave ground formed between.
[0012]
And according to this waste disposal site 10, the said waste disposal site 10 is divided | segmented into the some division 20, and after the reclamation work of each landfill layer of the said division 20 is complete | finished in each division 20, When the wastewater sheet 14 is unfolded and covered with the waste 13 in the compartment 20 and the waste 13 is buried in the upper layer, the waste 13 in the other compartment 20 is covered with the waterproof sheet 14. Then, after temporarily removing the water shielding sheet 14 of the section 20 ′ and performing a landfill operation, the operation of expanding and laying the water shielding sheet 14 again covering the waste 13 of the section 20 ′ is repeated in each section 20. Then, the landfill operation is performed by sequentially filling the waste 13 toward the upper layer while removing the rainwater poured on the water shielding sheet 14.
[0013]
According to this embodiment, each waste layer is buried so that the surface thereof has a downward gradient of, for example, about 3 to 5% toward the main dam 12 or the anchor dam 16, and upstream of the downward gradient. By performing landfill work sequentially from the section 20 located on the side toward the section 20 located on the downstream side, rainwater that has poured onto the surface of the water shielding sheet 14 is directed toward the main dam 12 and the anchor dam 16. It can be made to flow smoothly.
[0014]
And according to this embodiment, even when rainwater pours into the waste disposal site 10 due to rain when performing landfill work in this way, most of such rainwater is promptly disposed of in the disposal site. It is possible to easily prevent the rainwater from penetrating into the inside of the waste 13 by draining from 10.
[0015]
That is, since the landfilled waste 13 is almost entirely covered with the water shielding sheet 14, the penetration of rainwater into the waste 13 is easily blocked and the water shielding sheet 14. In each section 20 covered by the rainwater, the rainwater staying on the surface of the water shielding sheet 14 is removed from the section 20 by the rainwater removal method according to this embodiment, and rainwater is discharged from the inside of the disposal site 10 to the outside. It will flow down toward the drainage facility for draining.
[0016]
Here, the drainage facility includes a drainage pipe 25, a drainage tank 19 and a drainage pump provided at a portion where the waste 13 covered with the water shielding sheet 14 and the main dam 12 and the extension dam 16 are rubbed. 26, or the manhole 18 provided inside the embankment constituting the main dam 12, the connecting pipe 23 between these manholes 18, the drainage tunnel 17, and the like.
[0017]
And according to this embodiment, when covering the landfill layer of the waste 13 of each section 20 with the water shielding sheet 14, as shown in FIG. 2, the drainage groove 30 is provided around the section 20, An air bag 31 is interposed between the upper surface of the landfill layer and the water-impervious sheet 14 in an unexpanded state.
[0018]
The drainage grooves 30 are a plurality of sections along a descending slope toward the main dam 12 and the anchor dam 16, and are disposed around these, thereby being positioned at both ends in the upstream and downstream directions. The three sides 20 are connected to the drainage groove 30, and the partition 20 between these two sides is connected to the drainage groove 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.
[0019]
Moreover, in order to install the air bag 31 in each section 20, for example, when the landfilling operation of each waste layer is completed, the air bag 31 is disposed on the upper surface thereof, and the air bag 31 disposed thereafter is installed. In addition to the method of covering and laying the water shielding sheet 14, the air bag 31 may be attached to the inner surface of the water shielding sheet 14 in advance, and the air bag 31 may be installed together with the work of laying the water shielding sheet 14. .
[0020]
Here, in each section 20, the air bags 31 are arranged side by side on the upper surface of the landfill layer so as to extend along the descending slope of the air bags 31. A device is used in which the diameter after inflating gradually decreases toward the side air bag 31. Each of these air bags 31 is connected to an air hose, and air is supplied from a compressor or the like through the air hose. Each air bag 31 is provided with an air vent valve, and is inflated. The air can be removed from 31 and returned to a flat state as appropriate.
[0021]
And according to this embodiment, while there is little rainfall at the time of rain, rainwater naturally flows down along the surface of the water-impervious sheet 14 due to the downward slope of the landfill layer, and the downstream end of the drainage groove 30 After flowing into the drainage groove 30 and the drainage basin 33 through the drainage port 32 provided in the basin, it flows down toward the drainage facility (see FIG. 2, A).
[0022]
On the other hand, if the amount of rainfall increases and cannot be completely removed from the drain port 32, rainwater will gradually accumulate on the upper surface of the water shielding sheet 14 (see FIG. 2, B). If increased, air is supplied to the air bag 31 to inflate it, and the rainwater is made to flow into the drainage groove 30 by lifting the water shielding sheet 14 (see FIG. 2C), and easily drains rainwater toward the drainage facility. I can go. In FIG. 2, what is indicated by reference numeral 35 is a weight that is appropriately used when the water shielding sheet 14 is laid, and when the water shielding sheet 14 is lifted by the expansion of the air bag 31, It will be easily removed.
[0023]
Here, the operation of supplying air to the air bag 31 is facilitated from the upstream compartment 20 toward the downstream compartment 20 among the plurality of compartments 20 surrounded by the drainage groove 30, thereby facilitating reverse flow of rainwater. In addition, the five air bags 31 in each section 20 are inflated sequentially from the central air bag 31 toward the side air bags 31, thereby efficiently and efficiently being discharged into the drainage groove 30. Rainwater can be drained.
[0024]
That is, according to this embodiment, rainwater staying on the water-impervious sheet 14 can be easily forcibly drained and quickly flowed down toward the drainage facility.
[0025]
Moreover, if the rainwater which stays is drained, air can be extracted from the air bag 31 to return to a state where the rainwater can be retained again, and the rainwater which remains is stored by closing the drain port 32, for example. Therefore, it can be used as flooded water.
[0026]
In addition, this invention is not limited to the thing of the aspect of the said embodiment, A various change can be employ | adopted within the range of the structure described in the claim. For example, the surface of the landfill layer on which the water-impervious sheet is laid does not necessarily need to be provided with a downward slope, and can be employed in a state where the slope of the landfill layer is not yet prepared. Moreover, it is not always necessary to provide a drainage groove around the section covered with the water shielding sheet.
[0027]
【The invention's effect】
As explained in detail above, according to the method for draining rainwater in the waste disposal site of the present invention, when the landfill layer of the section is covered with the water shielding sheet, the upper surface of the landfill layer and the water shielding sheet If rainwater accumulates on the upper surface of the laid water-impervious sheet with an air bag in between, air is supplied to the air bag to inflate and drain the rainwater by lifting the water-impervious sheet. The staying rainwater can be easily forcedly drained from the section and allowed to flow quickly toward the drainage facility.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating a waste disposal site that employs 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 dam 13 Waste 14 Water shielding sheet 20, 20 'Section 30 Drain 31 Air bag

Claims (1)

Divide the waste disposal site into multiple sections, cover the landfill layer of waste in some sections with a water shielding sheet, and landfill waste while performing waste landfill work in other sections A method for removing rainwater in a waste disposal site, wherein when the landfill layer is covered with a water shielding sheet, an air bag is interposed between the top surface of the landfill layer and the water shielding sheet, and the water shielding is laid. A method for removing rainwater from a waste disposal site, characterized in that, when rainwater stays on the upper surface of the sheet, air is supplied to the air bag to inflate and the rainwater is drained by lifting the water shielding sheet.

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