JP2844975B2 - Final cover method 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 final covering method in a waste disposal site for preventing soil uplift due to the pressure of gas generated in a waste dumping pit or softening or muddying of soil due to rainfall. .

[0002]

2. Description of the Related Art In a waste disposal site, a process of burying waste in a waste pit and covering the surface when the waste layer becomes a certain thickness is alternately repeated. When the object reaches a certain height above the ground surface, final earth covering work is performed, and the upper part is used as a park.

[0003] In some cases, the final earth covering work is simply completed with earth covering as a simple method. However, with this method alone, there is a concern that rainwater or the like may infiltrate into the pit and become contaminated water, which may penetrate underground and contaminate the water source. Because of this, in general, water-impervious sheets are laid to prevent rainwater from infiltrating due to rainfall, and then final soil covering is performed, and furthermore, trees are planted according to the intended use, and the surface site is parked or other public facilities. To serve.

[0004]

However, the inside of the waste pit is caused by fermentation and decomposition of organic matter in the waste.
Methane gas and the like were easily generated, and when the surface was covered with a water-impervious sheet, there was no way for the gas to escape, and there was a fear of uplift or explosion of the ground surface. In addition, since the final covering is simply covered on the impermeable sheet, the water does not penetrate into the underground in case of rain, so water stays inside the covering and the surface ground is soft. There was a drawback that it was easy to be turned into muddy.

[0005] The present invention provides a final disposal site for a waste disposal site capable of sufficiently degassing, preventing water from penetrating into waste, and preventing the surface covering soil from softening and muddy. The purpose is to provide earth covering method.

[0006]

In order to achieve the above object, the final earth covering method according to the present invention is to cover the top of the waste buried in the waste dumping pit with a breathable waterproof sheet. A water-permeable material having a large porosity is laminated between the air-permeable water-blocking sheet and the final soil by laminating a water-permeable material over the entire upper surface of the base material and covering the surface of the water-permeable material with the final soil. .

[0007]

According to the above construction, the gas generated from the waste pit is accumulated on the entire upper surface of the waste pit through the gas permeable sheet.
The water enters the inside of the water-based material to be discharged, and is released to the atmosphere side from the end of the water-permeable material along the water. Rainwater that falls on the surface of the final soil cover passes between the final soil cover and the breathable impermeable sheet.
It permeates into the water-permeable material that is laminated over the entire upper surface of the air-permeable water-blocking sheet, and is discharged from the end and the like. Also, rainwater
The breathable waterproof sheet prevents penetration into the waste pit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a waste disposal site according to the present invention. In this waste disposal site, the ground E is excavated, or a hollow using natural terrain is used as a waste dumping pit 1, and waste 2a and cover soil 2b are alternately backfilled in the interior thereof in a stacked state. In the final state, the center of the buried object laminate 2 of the waste 2a and the covering soil 2b is raised high, and reaches the peripheral portion in a state of being inclined at a predetermined gradient.

As described above, when the inside of the pit 1 is filled with the buried object laminate 2, the final earth covering work is performed. First, the air-permeable water-blocking sheet 6 is put on the surface of the buried object laminate 2. After that, the entire upper surface of this sheet 6 is
Then, the water-permeable material 7 is laminated to a predetermined thickness, and finally, the surface of the water-permeable material 7 is covered with the final covering 8, and the final covering work is completed by leveling.

In parallel with the soil covering work, a drain groove 9 is dug around the waste dumping pit 1, and an end face 7 a of the layer of the water-permeable material 7 is exposed facing the drain groove 9. .
And the said venting pipe 4 is installed as needed,
A groove 2c is formed on the impermeable sheet of the pit 1, a ventilation pipe 3 is provided inside the groove 2c, and a gas vent pipe 4 is started up at an appropriate interval from the ventilation pipe 3. In the completed state, the sheet 6 penetrates the water-permeable material 7 and the covering soil 8 and projects to the surface thereof.

As a constituent material of the air-permeable water-blocking sheet 6, for example, a sheet material having gas permeability and water-blocking properties, such as a sheet having many fine holes, is used.
As the water permeable material 7, a filler material having a large porosity, such as sand or gravel, is used.

After the soil covering work is completed, the gas generated in the pit 1 reaches the back surface of the sheet 6 from the surface of the buried article laminate 2 and penetrates into the water-permeable material 7 by passing therethrough. And is released to the atmosphere side from the end face of the water-permeable material 7. Further, gas temporarily generated in a large amount is collected in the ventilation pipe 3 and released to the atmosphere through the gas release pipe 4.

If rainfall occurs after the completion of the earth covering work, the rain that has fallen on the earth covering 8 travels through the inside of the earth and covers the entire upper surface between the earth covering 8 and the sheet 6. <tb> Infiltrate into the water-permeable material 7 side to be laminated. Since the sheet 6 is a water-impervious material, the water soaked into the water-permeable material 7 flows down along the gradient, flows out from the end face 7a of the water-permeable material 7 into the drain groove 9, and the soil 8 Softening and muddying due to stagnation of rainwater can be prevented beforehand.

[0014]

As described in detail in the above embodiments, in the final soil covering method for a waste disposal site according to the present invention, the gas generated from the waste pit is made of a gas permeable sheet.
Through the permeable material that covers the entire top surface of
Along it, and the air is transferred from the end of the water-permeable material to the atmosphere.
Rainwater that can be easily released and poured
Has been penetrated into the waste pit by the breathable waterproof sheet.
It is prevented and does not seep into waste. In addition,
Rainwater that falls on the surface of the soil is
Penetrate the water-permeable material covering the entire upper surface of the
From the soil, making it easy to prevent softening and mud
Can be stopped.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a waste disposal site to which a final earth covering method of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste dumping pit 2 Buried object laminated body 6 Breathable impermeable sheet 7 Water permeable material 7a End face 8 Final covering 9 Drainage ditch

Claims (1)

(57) [Claims] 1. An uppermost portion of the waste buried in the waste dumping pit is covered with a breathable waterproof sheet.
By laminating a water-permeable material having a large porosity over the entire upper surface, and covering the surface of the water-permeable material with a final covering, a water-permeable material having a large porosity is laminated between the air-permeable water-blocking sheet and the final covering. The final covering method at a waste disposal site.